TY - THES A1 - Elzanowski, Jerzy T1 - Ruin conversions : violence, architecture and commemoration in post-1944 Warsaw N2 - Promotion an der Bauhaus-Universität Weimar (Dr. phil.) und zugleich PhD an der University of British Columbia Vancouver. 2015 auf dem Server der University of British Columbia mit Embargo veröffentlicht. Das Embargo wird immer wieder verlängert. Aktuell: This item is embargoed until 2026-06-30, you need to request access to be able to view the item's media before that date. KW - Umwandlung KW - Ruine KW - Umbau Y1 - 2015 UR - http://hdl.handle.net/2429/50265 U6 - http://dx.doi.org/10.14288/1.0166955 ER - TY - THES A1 - Schütz, Stephan T1 - Von der Faser zum Haus : Das Potential von gefalteten Wabenplatten aus Papierwerkstoffen in ihrer architektonischen Anwendung N2 - Der vorliegende Text beschreibt die intensive Erforschung von Wabenplatten aus Papierwerkstoffen, die durch Faltprozesse neue räumliche Zustände einnehmen können und somit ihr ursprüngliches Anwendungsspektrum erweitern. Die gezeigten Lösungsansätze bewegen sich dabei im Spannungsfeld von Architektur und Ingenieurbau, denn die gefalteten Bauteile sind nicht nur äußerst tragfähig sondern besitzen auch eine ästhetische Form. Die entwickelten Verfahren und Konstruktionen werden auf einem hohen architektonischen Niveau präsentiert und mit einfachen ingenieurtechnischen Methoden verifiziert. Zur Lösungsfindung werden geometrische Verfahren ebenso angewendet wie konstruktive Faustformeln und Recherchen aus Architektur und Forschung. Der Fokus der Arbeit liegt auf der Untersuchung von Faltungen in Wabenplatten. Während der Auseinandersetzung mit der Thematik erschienen jedoch viele weitere Aspekte als sehr interessant und bearbeitungswürdig. Als theoretische Grundlage dieser Arbeit werden deshalb die geschichtliche Entwicklung und die gesellschaftliche Bedeutung von Papier und Papierwerkstoffen analysiert und deren Produktionsprozesse beleuchtet. Diese Vorgehensweise ermöglicht eine Einordnung des Potentials und der Bedeutung des Werkstoffs Papier. Der Kontext der Arbeit wird dadurch gestärkt und führt zu interessanten zukünftigen Forschungsansätzen. Intensive Untersuchungen widmen sich der geometrischen Bestimmung von Faltungen in Wabenplatten aus Papierwerkstoffen sowie deren Manifestation als konstruktive Bauteile. Auch die statischen Eigenschaften der Elemente und ihr Konstruktionspotential werden erforscht und aufbereitet. Wichtige Impulse aus Forschung und Technik fließen in die Recherche der Arbeit ein und erlauben die Verortung der Ergebnisse im architektonischen Kontext. Versuchsreihen und Materialstudien an Prototypen belegen die Ergebnisse virtueller und rechnerischer Studien. Konzepte zur parametrischen Berechnung und Visualisierung der Forschungsergebnisse werden präsentiert und zeigen zukunftsfähige Planungshilfen für die Industrie auf. Etliche Testreihen zu unterschiedlichsten Abdichtungskonzepten führen zur Realisierung eines sehenswerten Experimentalbaus. Er erlaubt die dauerhafte Untersuchung der entwickelten Bauteile unter realistischen Bedingungen und bestätigt deren Leistungsfähigkeit. Dadurch wird nicht nur ein dauerhaftes Monitoring und eine Evaluierung der Leistungsdaten möglich sondern es wird auch der sichtbare Beweis erbracht, dass mit Papierwerkstoffen effiziente und hochwertige Architekturen zu realisieren sind, welche das enorme gestalterische Potential von gefalteten Wabenplatten ausnutzen. T3 - bauhaus.ifex research series - 1 KW - Tragendes Teil KW - Platte KW - Sandwichbauteil KW - Papierware KW - Wellpappe KW - Faltung KW - Architektur KW - Konstruktion KW - Bauteil KW - Leichtbau Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20181010-38044 ER - TY - THES A1 - Vu, Bac Nam T1 - Stochastic uncertainty quantification for multiscale modeling of polymeric nanocomposites N2 - Nanostructured materials are extensively applied in many fields of material science for new industrial applications, particularly in the automotive, aerospace industry due to their exceptional physical and mechanical properties. Experimental testing of nanomaterials is expensive, timeconsuming,challenging and sometimes unfeasible. Therefore,computational simulations have been employed as alternative method to predict macroscopic material properties. The behavior of polymeric nanocomposites (PNCs) are highly complex. The origins of macroscopic material properties reside in the properties and interactions taking place on finer scales. It is therefore essential to use multiscale modeling strategy to properly account for all large length and time scales associated with these material systems, which across many orders of magnitude. Numerous multiscale models of PNCs have been established, however, most of them connect only two scales. There are a few multiscale models for PNCs bridging four length scales (nano-, micro-, meso- and macro-scales). In addition, nanomaterials are stochastic in nature and the prediction of macroscopic mechanical properties are influenced by many factors such as fine-scale features. The predicted mechanical properties obtained by traditional approaches significantly deviate from the measured values in experiments due to neglecting uncertainty of material features. This discrepancy is indicated that the effective macroscopic properties of materials are highly sensitive to various sources of uncertainty, such as loading and boundary conditions and material characteristics, etc., while very few stochastic multiscale models for PNCs have been developed. Therefore, it is essential to construct PNC models within the framework of stochastic modeling and quantify the stochastic effect of the input parameters on the macroscopic mechanical properties of those materials. This study aims to develop computational models at four length scales (nano-, micro-, meso- and macro-scales) and hierarchical upscaling approaches bridging length scales from nano- to macro-scales. A framework for uncertainty quantification (UQ) applied to predict the mechanical properties of the PNCs in dependence of material features at different scales is studied. Sensitivity and uncertainty analysis are of great helps in quantifying the effect of input parameters, considering both main and interaction effects, on the mechanical properties of the PNCs. To achieve this major goal, the following tasks are carried out: At nano-scale, molecular dynamics (MD) were used to investigate deformation mechanism of glassy amorphous polyethylene (PE) in dependence of temperature and strain rate. Steered molecular dynamics (SMD)were also employed to investigate interfacial characteristic of the PNCs. At mico-scale, we developed an atomistic-based continuum model represented by a representative volume element (RVE) in which the SWNT’s properties and the SWNT/polymer interphase are modeled at nano-scale, the surrounding polymer matrix is modeled by solid elements. Then, a two-parameter model was employed at meso-scale. A hierarchical multiscale approach has been developed to obtain the structure-property relations at one length scale and transfer the effect to the higher length scales. In particular, we homogenized the RVE into an equivalent fiber. The equivalent fiber was then employed in a micromechanical analysis (i.e. Mori-Tanaka model) to predict the effective macroscopic properties of the PNC. Furthermore, an averaging homogenization process was also used to obtain the effective stiffness of the PCN at meso-scale. Stochastic modeling and uncertainty quantification consist of the following ingredients: - Simple random sampling, Latin hypercube sampling, Sobol’ quasirandom sequences, Iman and Conover’s method (inducing correlation in Latin hypercube sampling) are employed to generate independent and dependent sample data, respectively. - Surrogate models, such as polynomial regression, moving least squares (MLS), hybrid method combining polynomial regression and MLS, Kriging regression, and penalized spline regression, are employed as an approximation of a mechanical model. The advantage of the surrogate models is the high computational efficiency and robust as they can be constructed from a limited amount of available data. - Global sensitivity analysis (SA) methods, such as variance-based methods for models with independent and dependent input parameters, Fourier-based techniques for performing variance-based methods and partial derivatives, elementary effects in the context of local SA, are used to quantify the effects of input parameters and their interactions on the mechanical properties of the PNCs. A bootstrap technique is used to assess the robustness of the global SA methods with respect to their performance. In addition, the probability distribution of mechanical properties are determined by using the probability plot method. The upper and lower bounds of the predicted Young’s modulus according to 95 % prediction intervals were provided. The above-mentioned methods study on the behaviour of intact materials. Novel numerical methods such as a node-based smoothed extended finite element method (NS-XFEM) and an edge-based smoothed phantom node method (ES-Phantom node) were developed for fracture problems. These methods can be used to account for crack at macro-scale for future works. The predicted mechanical properties were validated and verified. They show good agreement with previous experimental and simulations results. KW - Polymere KW - nanocomposite KW - Nanoverbundstruktur KW - stochastic KW - multiscale Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20160322-25551 ER - TY - THES A1 - Sowoidnich, Thomas T1 - A Study of Retarding Effects on Cement and Tricalcium Silicate Hydration induced by Superplasticizers N2 - Fließmittel werden in Betonen verwendet, um deren Fließeigenschaften während der Verarbeitung zu verbessern und Wasser einzusparen. Beide Faktoren beeinflussen nicht nur den Frischbeton, sondern auch signifikant die Festbetoneigenschaften. Nachteilig wirken sich Fließmittel auf die Festigkeitsentwicklung aus, die z.T. sehr stark verzögert wird. Dies ist vor allem bei Bauteilen, die im Rahmen eines Vorfertigungsprozesses hergestellt werden, ein ökonomischer Nachteil. Die vorliegende Arbeit widmet sich den Ursachen für die Verzögerung der Portlandzementhydratation bei Verwendung von Fließmitteln. Um die komplexen Reaktionen, die während der Portlandzementhydratation auftreten, zu vereinfachen, betrachtet ein überwiegender Teil der Arbeit die Wechselwirkung Fließmittel-Tricalciumsilikat (Abk. Ca3SiO5 oder C3S, Hauptbestandteil von Portlandzementklinker). Die Untersuchungen werden in drei Hauptteilen durchgeführt, wobei Methoden wie u.a. isotherme Wärmeflusskalorimetrie, Elektrische Leitfähigkeit, Elektronenmikroskopie, ICP-OES, TOC als auch Analytische Ultrazentrifugation Anwendung finden. Basierend auf der Wechselwirkung von Kationen mit anionischen Ladungsträgern von Polymeren wird die Interaktion von Calcium mit Fließmitteln im ersten Teil der Arbeit untersucht. Dabei kommt es überwiegend zur Komplexierung von Calciumionen durch die funktionellen Gruppen der Plymere (Carboxyl- bzw. Sulfonguppen), die in zementären Umgebungen sowohl gelöst in der wässrigen Phase als auch als Bestandteil von Partikelgrenzflächen vorhanden sind. Neben diesen Effekten kann auch gezeigt werden, dass Fließmittel die Bildung von nanoskaligen Partikeln hervorrufen, die infolge der sterischen Wirkung von Fließmitteln dispergiert in der wässrigen Phase vorliegen (Clusterbildung). Analog zu neuesten Erkenntnissen aus dem Bereich der Biomineralisation ist daher davon auszugehen, dass diese Nanopartikel durch Agglomeration das Kristallwachtsum beeinflussen. Ausgehend von der Annahme, dass die Auflösungs- und/ oder Fällungskinetik durch die Wirkung von Fließmitteln behindert und damit für den Verzögerungseffekt der Fließmittel während der komplexen Hydratationsreaktion verantwortlich seien können, werden die zugrundeliegenden Vorgänge im zweiten Abschnitt getrennt voneinander untersucht. Es wird anhand von Lösungsuntersuchungen an C-S-H Phasen und Portlandit herausgestellt, dass die Komplexierung von gelösten Calciumionen durch funktionelle Gruppen der Polymere die Löslichkeit von Portlandit erhöht. Im Gegensatz führt die Komplexierung von Calciumionen in der wässrigen Phase zu einer Verringerung der Calciumionenkonzentration in der wässrigen Phase. Diese Effekte werden auf die unterschiedlich starke Adsorptionsneigung der Polymere an C-S-H-Phasen und Portlandit zurückgeführt. Es wird davon ausgegangen, dass die Adsorption aufgrund der größeren spezifischen Oberfläche stärker an den C-S-H-Phasen als am Portlandit auftritt. Demnach stellt sich dar, dass die Polymere erst nachdem die funktionellen Gruppen Calciumionen aus der wässrigen Phase komplexiert haben an den C-S-H-Phasen adsorbieren. Weiterhin kann gezeigt werden, dass die freie C3S Auflösungsrate in Anwesenheit von Fließmitteln keinen direkten Zusammenhang zur Verzögerung erkennen lässt. Teilweise kommt es zu einer in Bezug zur Kontrollprobe ohne Fließmittel erhöhten sowie auch verringerten Auflösungsrate. Wird das Komplexierungsvemögen der Fließmittel berücksichtigt, so kann durchaus eine verlangsamte freie Auflösungsrate ermittelt werden. Doch auch Calcit zeigt einen verzögernden Einfluss auf die freie C3S Auflösung, obwohl es den Gesamtprozess der Hydratation signifikant beschleunigt. Somit kann die behinderte Auflösung als mögliche Ursache für die verzögernde Wirkung während der Zementhydratation weder bestätigt noch widerlegt werden. Dieser Punkt sollte in zukünftigen Arbeiten weiter untersucht werden. Im letzten Schritt dieses Untersuchungsabschnitts wird die reine Kristallisation von C-S-H-Phasen und Portlandit untersucht. Es stellt sich heraus, dass Fließmittel insbesondere durch die Wirkung der Komplexierung von Ionen in der wässrigen Phase sowohl die Induktionszeit verlängern als auch die Kristallwachstumsrate verändern. Dies allein kann aber nicht die komplette Verzögerungswirkung erklären. Ein wichtiger Verzögerungsfaktor ist die Adsorption der Polymere an Kristalloberflächen als auch eine fließmittelbedingte Dispergierung von nanoskaligen Einzelpartikeln, die deren Agglomeration zu Kristallen behindert. Im letzten Hauptuntersuchungsabschnitt werden die gewonnenen Erkenntnisse auf die während der Zement- und Tricalciumsilikathydratation parallel ablaufenden Reaktionen analysiert. Dabei wird insbesondere die ionische Zusammensetzung der wässrigen Phase von C3S Pasten und Suspensionen untersucht, um Hinweise für eine kinetische Hemmung der Hydratationsreaktion zu identifizieren. Zusammenfassend wird festgestellt, dass die Ursachen der verzögernden Wirkung von Fließmitteln auf die Hydratation von C3S auf die starke Verzögerung der Kristallisation von Hydratphasen zurückzuführen ist. Dabei kommt den zwei Faktoren Komplexierung von Calciumionen an Oberflächen und Stabilisierung von nanoskaligen Partikeln eine zentrale Bedeutung zu. Diese Effekte können durch die Wirkung als Templat als auch durch Erhöhung der Löslichkeit infolge Komplexierung freier/gelöster Ionen teilkompensiert werden. Dass die Auflösungsreaktion durch die Anwesenheit von Fließmitteln behindert wird, kann nur indirekt anhand der Entwicklung von Ionenkonzentrationen festgestellt werden. Ob dieser Vorgang die Ursache oder die Folge des Lösungs-Fällungs-Mechanismus der Hydratation ist und damit die verzögernde Wirkung durch behinderte Auflösung des Edukts hervorgerufen wird, bleibt Gegenstand weiterer Untersuchungen. Im Rahmen der Arbeit kann auch gezeigt werden, dass Fließmittel chemisch als Inhibitoren wirken indem sie den Frequenzfaktor verringern. Darüber hinaus wird erstmalig eine Methode entwickelt, die die Bestimmung der Ionenkonzentration in Pasten in-situ erlaubt. Mit deren Hilfe wird dargestellt, dass die Entwicklung der Ionenkonzentration als auch die allgemein verwendete Wärmefreisetzungsrate (Kalorimetrie) miteinander korrespondiert. Darüber hinaus erlaubt die entwickelte Methode die weitere Differenzierung der Accelerationsperiode in drei Stadien. Die Kristallisation von C-S-H-Phasen und Portlandit ist für den Beginn der Haupthydratationsperiode entscheidend. N2 - Superplasticizers are utilized both to improve the fluidity during the placement and to reduce the water content of concretes. Both effects have also an impact on the properties of the hardened concrete. As a side effect the presence of superplasticizers affects the strength development of concretes that is strongly retarded. This may lead to an ecomomical drawback of the concrete manufacturing. The present work is aimed at gaining insights on the causes of the retarding effect of superplasticizers on the hydration of Portland cement. In order to simplify the complex interactions occurring during the hydration of Portland cement the majority of the work focuses on the interaction of superplasticizer and tricalcium silicate (Ca3SiO5 or C3S, the main compound of Portland cement clinker). The tests are performed in three main parts accompanied by methods as for example isothermal conduction calorimetry, electrical conductivity, Electron Microscopy, ICP-OES, TOC, as well as Analytical Ultracentrifugation. In the first main part and based on the interaction of cations and anionic charges of polymers, the interactions between calcium ions and superplasticizers are investigated. As a main effect calcium ions are complexed by the functional groups of the polymers (carboxy, sulfonic). Calcium ions may be both dissolved in the aqueous phase and a constitute of particle interfaces. Besides these effects it is furthermore shown that superplasticizers induce the formation of nanoscaled particles which are dispersed in the aqueous phase (cluster formation). Analogous to recent findings in the field of biomineralization, it is reasonable to assume that these nanoparticles influence the crystal growth by their assembly process. Based on the assumption that superplasticizers hinder either or both dissolution and precipitation and by that retard the cement hydration, the impact on separate reactions is investigated. On experiments that address the solubility of C-S-H phases and portlandite, it is shown that complexation of calcium ions in the aqueous phase by functional groups of polymers increases the solubility of portlandite. Contrary, in case of C-S-H solubility the complexation of calcium ions in solution leads to decrease of the calcium ion concentration in the aqueous phase. These effects are explained by differences in adsorption of polymers on C-S-H phases and portlandite. It is proposed that adsorption is stronger on C-S-H phases compared to portlandite due to the increased specific surface area of C-S-H phases. Following that, it is claimed that before polymers are able to adsorb on C-S-H phases the functional groups must be screened by calcium ions in the aqueous phase. It is further shown that data regarding the impact of superplasticizers on the unconstrained dissolution rate of C3S does not provide a clear relation to the overall retarding effect occurring during the hydration of C3S. Both increased and decreased dissolution rate with respect to the reference sample are detected. If the complexation capability of the superplasticizers is considered then also a reduced dissolution rate of C3S is determined. Despite the fact that the global hydration process is accelerated, the addition of calcite leads to a slower dissolution rate. Thus, a hindered unconstrained dissolution of C3S as possibly cause for the retarding effect still remains open for discussion. In the last section of this part, the pure crystallization of hydrate phases (C-S-H phases, portlandite) is fathomed. Results clearly show that superplasticizers prolong the induction time and modify the rate of crystal growth during pure crystallization in particular due to the complexation of ions in solution. But this effect is insufficient to account for the overall retarding effect. Further important factors are the blocking of crystal growth faces by adsorbed polymers and the dispersion of nanoscaled particles which hinders their agglomeration in order to build up crystals. In the last main part of the work, the previously gathered results are utilized in order to investigate hydration kinetics. During hydration, dissolution and precipitation occur in parallel. Thereby, special attention is laid on the ion composition of the aqueous phase of C3S pastes and suspensions in order to determine the rate limiting step. All in all it is concluded that the retarding effect of superplasticizers on the hydration of tricalcium silicate is based on the retardation of crystallization of hydrate phases (C-S-H phases and portlandite). Thereby, the two effects complexation of calcium ions on surfaces and stabilization of nanoscaled particles are of major importance. These mechanisms may partly be compensated by template performance and increase in solubility by complexation of ions in solution. The decreased dissolution rate of C3S by the presence of superplasticizers during the in parallel occuring hydration process can only be assessed indirectly by means of the development of the ion concentrations in the aqueous phase (reaction path). Whether this observation is the cause or the consequence within the dissolution-precipitation process and therefore accounts for the retarding effect remains a topic for further investigations. Besides these results it is shown that superplasticizers can be associated chemically with inhibitors because they reduce the frequency factor to end the induction period. Because the activation energy is widely unaffected it is shown that the basic reaction mechanism sustain. Furthermore, a method was developed which permits for the first time the determination of ion concentrations in the aqueous phase of C3S pastes in-situ. It is shown that during the C3S hydration the ion concentration in the aqueous phase is developed correspondingly to the heat release rate (calorimetry). The method permits the differentiation of the acceleration period in three stages. It is emphasized that crystallization of the product phases of C3S hydration, namely C-S-H phases and portlandite, are responsible for the end of the induction period. KW - Cement KW - Tricalcium silicate KW - Superplasticizer KW - Complexation KW - Retardation Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20160224-25444 SN - 978-3-00-052204-8 ER - TY - THES A1 - Jia, Yue T1 - Methods based on B-splines for model representation, numerical analysis and image registration N2 - The thesis consists of inter-connected parts for modeling and analysis using newly developed isogeometric methods. The main parts are reproducing kernel triangular B-splines, extended isogeometric analysis for solving weakly discontinuous problems, collocation methods using superconvergent points, and B-spline basis in image registration applications. Each topic is oriented towards application of isogeometric analysis basis functions to ease the process of integrating the modeling and analysis phases of simulation. First, we develop reproducing a kernel triangular B-spline-based FEM for solving PDEs. We review the triangular B-splines and their properties. By definition, the triangular basis function is very flexible in modeling complicated domains. However, instability results when it is applied for analysis. We modify the triangular B-spline by a reproducing kernel technique, calculating a correction term for the triangular kernel function from the chosen surrounding basis. The improved triangular basis is capable to obtain the results with higher accuracy and almost optimal convergence rates. Second, we propose an extended isogeometric analysis for dealing with weakly discontinuous problems such as material interfaces. The original IGA is combined with XFEM-like enrichments which are continuous functions themselves but with discontinuous derivatives. Consequently, the resulting solution space can approximate solutions with weak discontinuities. The method is also applied to curved material interfaces, where the inverse mapping and the curved triangular elements are considered. Third, we develop an IGA collocation method using superconvergent points. The collocation methods are efficient because no numerical integration is needed. In particular when higher polynomial basis applied, the method has a lower computational cost than Galerkin methods. However, the positions of the collocation points are crucial for the accuracy of the method, as they affect the convergent rate significantly. The proposed IGA collocation method uses superconvergent points instead of the traditional Greville abscissae points. The numerical results show the proposed method can have better accuracy and optimal convergence rates, while the traditional IGA collocation has optimal convergence only for even polynomial degrees. Lastly, we propose a novel dynamic multilevel technique for handling image registration. It is application of the B-spline functions in image processing. The procedure considered aims to align a target image from a reference image by a spatial transformation. The method starts with an energy function which is the same as a FEM-based image registration. However, we simplify the solving procedure, working on the energy function directly. We dynamically solve for control points which are coefficients of B-spline basis functions. The new approach is more simple and fast. Moreover, it is also enhanced by a multilevel technique in order to prevent instabilities. The numerical testing consists of two artificial images, four real bio-medical MRI brain and CT heart images, and they show our registration method is accurate, fast and efficient, especially for large deformation problems. KW - Finite-Elemente-Methode KW - isogeometric methods Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20151210-24849 ER - TY - THES A1 - Lehmann, Martin T1 - Investigations of the Loadbearing Behaviour of Timber Bending Beams Reinforced Using Prestressed CFRP-Lamellas N2 - The refurbishment of old buildings often goes hand in hand with an increase in both the dead and live loads. The latter, combined with the higher safety factors, often make the reinforcement of the old structures necessary. Most reinforcement methods involve transforming a structural timber member into a composite beam. Composite sections have a long tradition in timber construction. In the early days, multiple timber beams were connected with interlocking tooth and wooden shear connecters, which resulted in an elastic connection. Although historical timber structures are frequently upgraded, no method has yet been established and fully accepted by all stakeholders such as owners, builders, architects, engineers and cultural heritage organisations. Carbon fibre-reinforced polymers (CFRP) have already shown their efficiency in structural reinforcement especially in concrete structures. Moreover, previous studies have shown that CFRP has the potential to meet the expectations of all parties involved. In order to reach the service-limit state, a high amount of carbon fibres has to be used, or considering the cost of reinforcement, prestress has to be applied. However, prestressing often goes hand-in-hand with delaminating issues. The camber method presented here offers an efficient solution for prestressing timber bending members and overcoming the known obstacles. In the method proposed, the timber beam is cambered using an adjustable prop at midspan during the bonding of the CRFP-lamella to the lower side of the bending member. After curing the adhesive, the prop is removed and the prestressed composite beam is ready to be used. The prestress introduced in the system is not constant, but has a triangular shape and peaks at midspan, where it is used the most. The prestress force, which declines towards the end of the beam, leads to a constant shear stress over the whole length of the reinforcement,avoiding a concentrated anchorage zone. An analytical calculation model has been developed to calculate and design prestressed timber- bending members using the camber method. Numerical modelling, using a multi-surface plasticity model for timber, confirmed the results from the analytical model, and clearly reduced delaminating issues, comparing very favourably to traditional prestressing methods. The experimental parametric study, including the determination of the short-term loadbearing capacity of structural-sized beams, showed agreement with the analytical and numerical calculation. The prestressed reinforcement showed a benefit of nearly 50% towards the ultimate-limit state and up to 70% towards the service-limit state. Calculations revealed that the use of high modulus CFRP allows even higher benefits, depending on the configurations and requirements. The long-term design of the prestressed composite beam was investigated by extending the analytical model. The creep of the timber leads to a load transfer from the timber towards the CFRP, and therefore increases the benefit towards the ultimatelimit design. Applying high modulus CFRP-lamellas allows for a complete utilisation of the design capacity of timber and carbon fibre-reinforced polymer. The thorough investigation conducted demonstrated that the camber method is an efficient technique for prestressing and reinforcing timber-bending members. Furthermore, the calculation model presented allows for a safe design and estimation of long-term behaviour. N2 - Die Sanierung von bestehenden Gebäuden bringt häufig eine Erhöhung der Nutz- und Auflasten mit sich. Dies und die von den neuen Normen geforderten höheren Sicherheitsfaktoren erfordern oft eine Verstärkung der bestehenden Tragstruktur. Die meisten Massnahmen verwandeln den Holzbalken in einen Verbundquerschnitt. Zusammengesetzte Querschnitte haben in der Holzkonstruktion eine lange Tradition. Zu Beginn wurden die Konstruktionen durch Verzahnen und / oder durch Hartholzdübel respektive Keile miteinander verbunden. Kohlefaser verstärke Kunststoffe (CFK) haben bereits den Nachweis der Effizienz zur Verstärkung bestehender Strukturen erbracht, dies insbesondere im Betonbau. Verstärkungen im Holzbau werden bereits durchgeführt, jedoch hat sich bis heute noch keine Methode etabliert welche für alle involvierten Parteien wie Bauherr, Bauunternehmung, Architekt Ingenieur und Denkmalpflege zufriedenstellend ist. Verschiedene Untersuchungen zeigten, dass CFK das Potenzial hat diese Ansprüche zu erfüllen. Um mit dem Hochleistungsmaterial CFK auch die Durchbiegung reduzieren zu können ist entweder eine Vorspannung notwendig oder es muss andererseits sehr viel CFK eingesetzt werden, was die Methode unnötig verteuert. Leider kommt eine Vorspannung meist Hand in Hand mit Delaminierungsproblemen. Die Ursache dafür sind konzentrierte Schubspannungen an den Lamellenenden. Hier setzt die in der Dissertation präsentierte Methode zur Vorspannung von Biegebalken an und löst die bekannten Probleme. Die Vorspannung wird durch Überhöhung des zu sanierenden Balkens während der Verklebung mit der Kohlefaserlamelle erzeugt. Dies erfolgt mit Hilfe einer Schalungsstütze in der Mitte des Balkens. Durch das Entfernen der Schalungsstütze wird der verstärkte Balken vorgespannt und kann belastet werden. Das durch die Überhöhung induzierte Biegemoment ist dreieckförmig. Daher ist die Schubspannung in der Klebefuge gleichmässig über die Länge verteilt und auf eine konzentrierte Verankerung der Vorspannkraft wird verzichtet. Die Vorspannkraft ist in der Mitte, wo sie am meisten benötigt wird, am grössten und gegen aussen abnehmend. Ein analytisches Berechnungsmodel zur Berechnung und Dimensionierung von Balken, welche mit der präsentierten Methode vorgespannt sind, wurde entwickelt. Nummerische Modellierungen mit einem nichtlinearen Materialmodell für Holz bestätigten die Resultate der analytischen Berechnungen und das klar reduzierte Risiko gegenüber Delaminierung. Die Laborversuche beinhalteten eine Parameterstudie sowie die Ermittlung der Bruchlast von vorgespannten Holzbalken mit baupraktischen Abmessungen. Die Tragfähigkeit konnte um ca. 50 % gesteigert werden. Der Beitrag zur vebrauchstauglichkeit war, abhängig vom Gefährdungsbild, bis zu 70 %. Berechnungen zeigten, dass bei der Verwendung von hochmoduligen CFK-Lamellen diese Werte je nach Anforderung und Gefährdungsbild noch höher ausfallen. Das Langzeitverhalten des Verbundquerschnittes wurde analytisch untersucht. Durch das Kriechen des Holzes wird es über die Zeit leicht entlastet und der CFK übernimmt mehr Last. Bei hochmoduligen CFK-Lamellen kann die Kapazität von Holz und CFK vollständig ausgenutzt werden. Die ausführlichen Untersuchungen bewiesen die Effizienz der präsentierten Verstärkungsmethode. Mit dem analytischen Berechnungsmodell können verstärkte Balken sicher dimensioniert und das Langzeitverhalten abgeschätzt werden. KW - Holzbau KW - Sanierung KW - Kohlenstofffaserverstärkter Kunststoff KW - Verbund KW - Vorspannung KW - timber structure KW - reinforcement KW - CFRP KW - prestress KW - composite Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150916-24566 ER - TY - THES A1 - Riehmann, Patrick T1 - Advanced Visual Interfaces for Informed Decision-Making N2 - This thesis presents new interactive visualization techniques and systems intended to support users with real-world decisions such as selecting a product from a large variety of similar offerings, finding appropriate wording as a non-native speaker, and assessing an alleged case of plagiarism. The Product Explorer is a significantly improved interactive Parallel Coordinates display for facilitating the product selection process in cases where many attributes and numerous alternatives have to be considered. A novel visual representation for categorical and ordered data with only few occurring values, the so-called extended areas, in combination with cubic curves for connecting the parallel axes, are crucial for providing an effective overview of the entire dataset and to facilitate the tracing of individual products. The visual query interface supports users in quickly narrowing down the product search to a small subset or even a single product. The scalability of the approach towards a large number of attributes and products is enhanced by the possibility of setting some constraints on final attributes and, therefore, reducing the number of considered attributes and data items. Furthermore, an attribute repository allows users to focus on the most important attributes at first and to bring in additional criteria for product selection later in the decision process. A user study confirmed that the Product Explorer is indeed an excellent tool for its intended purpose for casual users. The Wordgraph is a layered graph visualization for the interactive exploration of search results for complex keywords-in-context queries. The system relies on the Netspeak web service and is designed to support non-native speakers in finding customary phrases. Uncertainties about the commonness of phrases are expressed with the help of wildcard-based queries. The visualization presents the alternatives for the wildcards in a multi-column layout: one column per wildcard with the other query fragments in between. The Wordgraph visualization displays the sorted results for all wildcards at once by appropriately arranging the words of each column. A user study confirmed that this is a significant advantage over simple textual result lists. Furthermore, visual interfaces to filter, navigate, and expand the graph allow interactive refinement and expansion of wildcard-containing queries. Furthermore, this thesis presents an advanced visual analysis tool for assessing and presenting alleged cases of plagiarism and provides a three-level approach for exploring the so-called finding spots in their context. The overview shows the relationship of the entire suspicious document to the set of source documents. An intermediate glyph-based view reveals the structural and textual differences and similarities of a set of finding spots and their corresponding source text fragments. Eventually, the actual fragments of the finding spot can be shown in a side-by-side view with a novel structured wrapping of both the source, as well as the suspicious text. The three different levels of detail are tied together by versatile navigation and selection operations. Reviews with plagiarism experts confirm that this tool can effectively support their workflow and provides a significant improvement over existing static visualizations for assessing and presenting plagiarism cases. The three main contributions of this research have a lot in common aside from being carefully designed and scientifically grounded solutions to real-world decision problems. The first two visualizations facilitate the decision for a single possibility out of many alternatives, whereas the latter ones deal with text at varying levels of detail. All visual representations are clearly structured based on horizontal and vertical layers contained in a single view and they all employ edges for depicting the most important relationships between attributes, words, or different levels of detail. A detailed analysis considering the context of the established decision-making literature reveals that important steps of common decision models are well-supported by the three visualization systems presented in this thesis. KW - Informatik KW - Visualisierung KW - Information Visualization KW - Preferential Choice KW - Text-based Visualization KW - Plagiarism Visualization KW - Product Search Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150907-24542 PB - Patrick Riehmann ER - TY - THES A1 - Nguyen, Manh Hung T1 - µ-Hyperholomorphic Function Theory in R³: Geometric Mapping Properties and Applications N2 - This thesis applies the theory of \psi-hyperholomorphic functions dened in R^3 with values in the set of paravectors, which is identified with the Eucledian space R^3, to tackle some problems in theory and practice: geometric mapping properties, additive decompositions of harmonic functions and applications in the theory of linear elasticity. KW - mathematics KW - harmonic KW - quaternion KW - elasticity KW - geometry KW - Mathematik Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150817-24477 ER - TY - THES A1 - Rohde, Theres T1 - Die Bau-Ausstellung zu Beginn des 20. Jahrhunderts oder "Die Schwierigkeit zu wohnen" N2 - Die Bau-Ausstellung zu Beginn des 20. Jahrhunderts oder „Die Schwierigkeit zu wohnen“, so lautet der Titel der Arbeit und legt damit ihren Fokus offen. Sie betrachtet ein um 1900 aufkommendes Ausstellungsphänomen in seinen ersten Dekaden; in einer Zeit, in der das Wohnen problematisiert wurde. Der Praxis des Wohnens ist Anfang des 20. Jahrhunderts seine Selbstverständlichkeit abgesprochen worden. Die Bau-Ausstellung wird als ein Symptom dieses Verlusts interpretiert und zugleich als Versuch, ihm entgegenzuwirken. Statt sie innerdisziplinär als eine architekturgeschichtliche Episode der Moderne rein positivistisch zu beschreiben, legt die vorliegende Arbeit im Typus der Bau-Ausstellung eine weit reichende Problematik frei, die kulturphilosophische ebenso wie medientheoretische Dimensionen hat: Inwieweit lässt sich das Wohnen überhaupt ausstellen? Wie kann man eine alltägliche Praxis, die kaum eine Definition erlaubt, zeigen? Den Umgang mit dieser Aporie untersucht die Arbeit. KW - Architektur KW - Ausstellung KW - Wohnen KW - Architekturgeschichte KW - Architektur der Moderne KW - Ausstellungstheorie KW - Designgeschichte Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150811-24425 ER - TY - THES A1 - Che, Fei T1 - The Socio-spatial transition of Beijing, in between communal space and associative space N2 - Abstract In this research, based on socio-spatiality as the starting point, it has conducted extensive city space analysis to advance a new urban social space theory. Resting upon the basis of traditional continent philosophy, this social space theory has adopted the structuration methods, at the same time trying to build certain combination between theoretical frame work establishment and empirical observations. Therefore, the socio-spatial transition study is neither a macro theory of traditional structuralism nor a typology of urban planning theory, or a positivism social geography, but an operative theory on practical purpose. Firstly, what’s distinct from the traditional structuralism is that this study examines the endless transiting structural relations, not macroscopic narrations of absolute definition and structure. In fact, any city and space are always co-existed in their structurational transiting relationship, thus research in transition has become the main body of this study. And case study is a must for research in transition, as part of efforts to apply the structuration concept into practice reason. Secondly, this study first establishes the fundamental structuration concept of socio-spatial transition, which, as an operative tool, is applied to conduct transition analysis on specific case about the City of Beijing. Therefore, as a social space theory, referring to as science, remains criticism of traditional continent philosophy. However, this criticism did not working on the level of ideology or conceptions, but on transiting under structural relations, keeping it from incompetent ideology criticism of continental critical theory. Unfortunately contemporary urban and space development have now gone extremely unbalanced under a background of globalization; yet traditional macro theories are incapable of either producing significant impact on practice or helping people identify practical problems. While facing general issues, particularly the Chinese urban issue category established on a meta-structured city mode, the micro-case study has plunged into dilemma for unknowing either to ask questions or to answer questions. Therefore, this study is set to identify dilemma and find direction for future relevant research. In this dissertation, Beijing is used as a model, and structuration methods as tools. It has extensively analyzed the social-spatial transition of the city space of Beijing, acquiring brand-new knowledge of its urban space development. It is helpful to an in-depth understanding of the city space development not only in Beijing, but also in many other cities that were influenced by the capital model of Beijing. Since the start of reform and opening-up, China has created a unique development mode of the new-styled metropolitan and urbanization in history. This research is expected to analyze or decode what China’s urban development in between communal space and associative space. KW - Stadtsoziologie KW - Socio-spatiality KW - transition KW - communal space KW - associative space Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150721-24368 ER - TY - THES A1 - Kloke, Christina Anna T1 - Das Manifest als Medium der Rezeptionssteuerung im Architektur- und Designdiskurs T1 - The manifesto as an instrument of the systematic control of reception in the architecture and design discourse N2 - In der vorliegenden Arbeit werden Manifestäußerungen des Design- und Architekturdiskurses im situativen, medialen, institutionellen und historischen Kontext untersucht. Auf Grundlage einer Analyse der Etymologie und der Ideengeschichte des Manifestes wird anhand ausgewählter Beispiele die These belegt, dass das Medium vor allem der gezielten Rezeptionssteuerung im Diskurs dient. Darüber hinaus wird die Fähigkeit und Bedeutung des Manifestes als Spiegel vergangener und gegenwärtiger, aber auch als Wegbereiter zukünftiger Diskurse analysiert und Entwicklungen des Manifestes hinsichtlich Stilistik, Inhalt, Funktion und Bedeutung im Design- und Architekturdiskurs dargestellt. N2 - This study examines manifestos from the design and architecture discourse in their situational, media, institutional and historical context. Based on an etymological analysis and on the manifesto’s history of ideas, the thesis uses selected examples to describe the manifesto as an instrument of the systematic control of reception in the discourse. In addition, the ability of the manifesto to mirror past and present discourses as well as to shape future discourses is shown. Also, the evolution of the manifesto regarding style, content, function and historical meaning will be analyzed. KW - Manifest KW - Rezeption KW - Architektur KW - Rezeptionssteuerung KW - Manifesto KW - Reception KW - architecture Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150702-24284 UR - http://e-pub.uni-weimar.de/opus4/frontdoor/index/index/docId/2415 N1 - Das Dokument wurde mit Ergänzungen neu veröffentlicht. Das Originaldokument wurde zurückgezogen (siehe weiterführender Link). ER - TY - THES A1 - Rodríguez Schaeffer, Alan Paul T1 - Lighting in urban heritage: case study of Chiapa de Corzo, Chiapas, Mexico N2 - As human thought was developing, likewise, the technology used for illumination was growing. But a haul through history, reviewing its pages and analyzing it, inherently brings up old and new question, like: Is it possible to alter negatively the image of historic buildings and monuments through inadequate lighting to the degree of distorting the perception that people have of the work? and if so, what are the causes that generate it? Do the light designers take into consideration criteria to protect not only historic buildings and monuments, but also the environment? What are the consequences that may generate the inadequate lighting of urban heritage to the environment? What are the factors to consider for a proper illumination of urban heritage? The answers to these questions will help lay the foundation for proper illumination of the urban heritage, avoiding at the maximum the light pollution and the effects that it generates, seeking a balance and harmonious reconciliation between the technology, urban heritage and environment, taking as a framework and the case study the urban heritage of a city from the colonial era in southern Mexico, with pre-Hispanic roots and where today you can still see through its streets and buildings an atmosphere of mysticism reflection of their folklore and traditions, this city is known as Chiapa de Corzo, Chiapas. KW - Architectual lighting KW - Architecture KW - Urban Heritage KW - Conservation KW - Konservierung KW - Beleuchtung Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150630-24217 ER - TY - THES A1 - Kloke, Christina Anna T1 - Das Manifest als Medium der Rezeptionssteuerung im Architektur- und Designdiskurs T1 - The manifesto as a tool of reception control in architecture and design discourse. N2 - In der vorliegenden Arbeit werden Manifestäußerungen des Design- und Architekturdiskurses im situativen, medialen, institutionellen und historischen Kontext untersucht. Auf Grundlage einer Analyse der Etymologie und der Ideengeschichte des Manifestes wird anhand ausgewählter Beispiele die These belegt, dass das Medium vor allem der gezielten Rezeptionssteuerung im Diskurs dient. Darüber hinaus wird die Fähigkeit und Bedeutung des Manifestes als Spiegel vergangener und gegenwärtiger, aber auch als Wegbereiter zukünftiger Diskurse analysiert und Entwicklungen des Manifestes hinsichtlich Stilistik, Inhalt, Funktion und Bedeutung im Design- und Architekturdiskurs dargestellt. N2 - This study examines manifestos from the design and architecture discourse in their situational, media, institutional and historical context. Based on an etymological analysis and on the manifesto’s history of ideas, the thesis uses selected examples to describe the manifesto as an instrument of the systematic control of reception in the discourse. In addition, the ability of the manifesto to mirror past and present discourses as well as to shape future discourses is shown. Also, the evolution of the manifesto regarding style, content, function and historical meaning will be analyzed. KW - Manifest KW - Rezeption KW - Architektur KW - Architecture KW - Manifesto KW - reception KW - Rezeptionssteuerung Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150623-24151 UR - http://e-pub.uni-weimar.de/opus4/frontdoor/index/index/docId/2428 N1 - Das Originaldokument wurde zurückgezogen. Das Dokument wurde mit Ergänzungen neu veröffentlicht(siehe weiterführender Link). ER - TY - THES A1 - Arkarapotiwong, Piyadech T1 - THE INVESTIGATION OF LIVING HERITAGE ATTRIBUTES IN LIVING HERITAGE SITES N2 - The conservation of living heritage sites is a highly complex process. Two factors need careful consideration in order to achieve a balance in the management of such sites: the conservation demands of conservation experts for built heritage and the needs of local people for development of their heritage living space. The complexity of factors involved make for an interesting study of living heritage, taken up by this research in its main case study of the town of Nan in Thailand. Research into the historical background of Nan and its cultural heritage reveals a living heritage site, which is both unique and diverse. Present day Nan was examined using a variety of analysis tools, which were applied to data from interviews, empirical data, field surveys, and documents, in order to better understand the nature of the living heritage site and changing trends over time. Luang Prabang in Lao PDR, a World Heritage site since 1995, was also selected as a further case study with which to compare Nan’s potential World Heritage status from a point of view of changes to living heritage attributes. The outcomes of the research indicate the importance of the management of the sites, which can be at risk of losing balance by focusing on one aspect of heritage to the detriment of the other. The conservation perspective, if allowed to dominate, as in Luang Prabang, can cause irreparable damage to the social fabric, where the development needs of the town are not met. This research concludes that a balance of power amongst stakeholders in the collaborative networks managing such sites is vital to sustaining a balance of living heritage attributes. KW - Kulturerbe KW - social network analysis KW - living heritage site Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150619-24086 ER - TY - THES A1 - Lovsin, Polonca T1 - Between the Urban and the Rural : Back to the city N2 - Abstract This doctoral thesis defines the relationship between the urban and rural in the 21st century, and focuses on food as a key component. The fact that food is, for the most part, produced in the countryside and then transported to the city has a significant influence on this very unbalanced relationship today. The main goal was to show that it is necessary to bring agriculture, urban gardening, the breeding of domestic farm animals, and beekeeping back to the city, which would have a positive affect on both the city and the countryside. All of this is already taking place at the local level, within the neighbourhoods of our cities and through the work of self-organised activities and initiatives, which have been taken up by city residents themselves. One example of this is the community garden, a new model of gardening which offers fertile ground for growing vegetables and to test various forms of co-existence, different ways of designing spaces, the creation of alternative values, and a positive vision for the future of city residents. In 2010, I co-created the community urban garden Beyond a Construction Site, which is the central part of this artistic research. Throughout the entire four-year process of creating this community garden, theory and artistic practice were intertwined, and informed one another. This community garden is an example of a self-organised and self-managed community space located in a residential neighbourhood in the centre of the city of Ljubljana, and as such is a typical example of urbanism from the bottom up. I placed the creation and development of our community garden in a dialogue with the formal way of arranging urban gardening in Ljubljana, a top-down approach, which the city has been carrying out intensively since 2007. I compared the solutions being proposed by the city of Ljubljana for organising urban gardening with the way it is organised in other European cities, the UK, and the USA. I also researched the recent rapid growth of self-organised initiatives which are focused on the local production of food and seek to find more economic and ecologically friendly models to visibly influence the future of cities and the countryside. Here, community gardens play an important role, as in addition to the production of food they are also spaces for the criticism of existing urban policies, a self-organised revitalisation of neglected spaces, and places of resilience, because they differ from that which real estate agencies, large financial companies, and city authorities desire them to be. The community garden Beyond a Construction Site has become living proof that, through a group action, the residents of a neighbourhood can influence existing city policies and the future of both their own neighbourhood and that of the entire city. The initiators of this garden are artists and architects, and we began this community garden in the context of an art festival, which also shows that art can influence the processes of everyday life and help to create much needed spaces within cities to serve various purposes. Our community garden has also shown itself to be an important platform for the exchange of knowledge on organic gardening, ecology in everyday life, and critical architecture, as well as serving to connect related initiatives. Together with these other initiatives we are stronger, and are influencing structural changes within city politics, thereby also co-creating the future of Ljubljana. This community garden is helping us to redefine our relationship with the city and re-awaken the desires and actions of residents connected with realising their fundamental right, the right to the city. My other artworks, which I am presenting in the context of this doctoral thesis, show an optimistic vision for the future of cities. The video animations Back to the City (2011) and The Right Balance (2013), as well as the accompanying collages, visualise a city of the future where urban and rural practices live together side-by-side. This vision is being realised by city residents themselves, with their active participation in the creation of community gardens, growing their own vegetables, urban beekeeping, and by having egg-laying hens in their gardens. My desire was also to present the theoretical concept and scientific research to a non-academic public, and to people without specialised training. Using the method of storytelling I included knowledge from the research into the video animations and collages. In this way my artistic work, with an intentional playfulness, challenges today’s faith in science and theoretical concepts, as well as directing attention to working with common sense, with one’s own hands, and with the earth. This can contribute to a change in the still dominant anthropocentric view of nature, which is an urgently needed change for our future. Keywords: rural, urban agriculture, community gardens, urban beekeeping, the bottom-up approach to urban planning, alternative spaces KW - rural KW - urban agriculture KW - community gardens KW - urban beekeeping KW - the bottom-up approach to urban planning KW - alternative spaces KW - Gemeinschaftsgarten KW - Stadtplanung KW - Agrarprodukt Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150610-24020 ER - TY - THES A1 - Aurin, Ingo T1 - Spurencodierung und Berührungsmessung T1 - Human Touch N2 - In der vorliegenden Ph.D.-Arbeit werden die Bereiche Materialität, Objektkultur und Physical Computing adressiert. Der Autor erkennt nun durch die durchlaufene intensive theoretische Betrachtungsweise des Themas Materialität die Bedeutung von Tastsinn und Objektoberflächen für den Alltag des praktizierenden Gestalters und proklamiert eine Wende und Hinwendung der Designpraxis zu den Potenzialen von Materialität und deren Bedeutung für die Akteure. Die Aufgabe der Praxisforschung ist es, eine inklusive Optimierungsmethode des Produktdesigns zu gestalten, mit der Designentwicklungen durch überprüfbare Nutzungsdaten optimiert werden können. Die taktile Pilotmethode ergab auf Basis der Generierung von Nutzerkarten Erkenntnisse über biometrische Werte, individuelle Körpergrößen und unterschiedliche Handhabungsprinzipien. N2 - The knowledge generated through literature on philosophy and material culture feeds more into the practical discourse of product design and in particular the design of technology simulating physical events. As mentioned previously and above, it is fact that, in product design, the significance of surface touch is a minor priority and is of secondary importance within the decision-making process of design. KW - human touch KW - affordance KW - inclusive design KW - Materialität KW - Produktgestaltung Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150526-23975 ER - TY - THES A1 - Budarapu, Pattabhi Ramaiah T1 - Adaptive multiscale methods for fracture T1 - Adaptive Multiskalen-Methoden zur Modellierung von Materialversagen N2 - One major research focus in the Material Science and Engineering Community in the past decade has been to obtain a more fundamental understanding on the phenomenon 'material failure'. Such an understanding is critical for engineers and scientists developing new materials with higher strength and toughness, developing robust designs against failure, or for those concerned with an accurate estimate of a component's design life. Defects like cracks and dislocations evolve at nano scales and influence the macroscopic properties such as strength, toughness and ductility of a material. In engineering applications, the global response of the system is often governed by the behaviour at the smaller length scales. Hence, the sub-scale behaviour must be computed accurately for good predictions of the full scale behaviour. Molecular Dynamics (MD) simulations promise to reveal the fundamental mechanics of material failure by modeling the atom to atom interactions. Since the atomistic dimensions are of the order of Angstroms ( A), approximately 85 billion atoms are required to model a 1 micro- m^3 volume of Copper. Therefore, pure atomistic models are prohibitively expensive with everyday engineering computations involving macroscopic cracks and shear bands, which are much larger than the atomistic length and time scales. To reduce the computational effort, multiscale methods are required, which are able to couple a continuum description of the structure with an atomistic description. In such paradigms, cracks and dislocations are explicitly modeled at the atomistic scale, whilst a self-consistent continuum model elsewhere. Many multiscale methods for fracture are developed for "fictitious" materials based on "simple" potentials such as the Lennard-Jones potential. Moreover, multiscale methods for evolving cracks are rare. Efficient methods to coarse grain the fine scale defects are missing. However, the existing multiscale methods for fracture do not adaptively adjust the fine scale domain as the crack propagates. Most methods, therefore only "enlarge" the fine scale domain and therefore drastically increase computational cost. Adaptive adjustment requires the fine scale domain to be refined and coarsened. One of the major difficulties in multiscale methods for fracture is to up-scale fracture related material information from the fine scale to the coarse scale, in particular for complex crack problems. Most of the existing approaches therefore were applied to examples with comparatively few macroscopic cracks. Key contributions The bridging scale method is enhanced using the phantom node method so that cracks can be modeled at the coarse scale. To ensure self-consistency in the bulk, a virtual atom cluster is devised providing the response of the intact material at the coarse scale. A molecular statics model is employed in the fine scale where crack propagation is modeled by naturally breaking the bonds. The fine scale and coarse scale models are coupled by enforcing the displacement boundary conditions on the ghost atoms. An energy criterion is used to detect the crack tip location. Adaptive refinement and coarsening schemes are developed and implemented during the crack propagation. The results were observed to be in excellent agreement with the pure atomistic simulations. The developed multiscale method is one of the first adaptive multiscale method for fracture. A robust and simple three dimensional coarse graining technique to convert a given atomistic region into an equivalent coarse region, in the context of multiscale fracture has been developed. The developed method is the first of its kind. The developed coarse graining technique can be applied to identify and upscale the defects like: cracks, dislocations and shear bands. The current method has been applied to estimate the equivalent coarse scale models of several complex fracture patterns arrived from the pure atomistic simulations. The upscaled fracture pattern agree well with the actual fracture pattern. The error in the potential energy of the pure atomistic and the coarse grained model was observed to be acceptable. A first novel meshless adaptive multiscale method for fracture has been developed. The phantom node method is replaced by a meshless differential reproducing kernel particle method. The differential reproducing kernel particle method is comparatively more expensive but allows for a more "natural" coupling between the two scales due to the meshless interpolation functions. The higher order continuity is also beneficial. The centro symmetry parameter is used to detect the crack tip location. The developed multiscale method is employed to study the complex crack propagation. Results based on the meshless adaptive multiscale method were observed to be in excellent agreement with the pure atomistic simulations. The developed multiscale methods are applied to study the fracture in practical materials like Graphene and Graphene on Silicon surface. The bond stretching and the bond reorientation were observed to be the net mechanisms of the crack growth in Graphene. The influence of time step on the crack propagation was studied using two different time steps. Pure atomistic simulations of fracture in Graphene on Silicon surface are presented. Details of the three dimensional multiscale method to study the fracture in Graphene on Silicon surface are discussed. T3 - ISM-Bericht // Institut für Strukturmechanik, Bauhaus-Universität Weimar - 2015,1 KW - Material KW - Strukturmechanik KW - Materialversagen KW - material failure Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150507-23918 ER - TY - THES A1 - Campos Medina, Fernando T1 - The Role of Individuals in Socio-Urban Exclusion : A case study on the School Institution in Santiago de Chile N2 - This is a work concerned with the increasing processes of social exclusion in cities nowadays. In approaching this phenomenon, the research highlights how people interact with their institutional environments. This is also, perhaps centrally, an investigation into the possibility to engage an individual perspective to understand the transformation in urban experience, which is orienting society to new uses and forms of exclusion. Following the perspective deployed by the so-called “sociology of individuals” in French sociology or “reengagement of agency” in the Anglo-Saxon world; I claim that individuals as well as collectives are gaining increasing power to question and re-organize institutions. This re-organization, in the case of socio-urban institutions, is no guarantee for major levels in integration, cohesion, and equality. Unfortunately, social institutions are becoming hard in its exclusionary capabilities under people intervention during the last four decades. I believe that urban sociology is a field of struggle between different perspectives competing to “make sense” of social phenomena in cities. The orientation supported in this research is just one on many and it follows the roots of people and their life experiences within cities and how they influence the processes that shape the city. The last formulation is possibly not the clearest, because as we all know, references to “inhabitants” are presented in every variant of urban sociology. Nevertheless, there are not many variants focusing on peoples’ capability to influence institutional environments and by this way affecting the urban condition in which they find themselves. The particular institution selected for this study is the “School”. This thesis is organized around two parts: part one includes the conceptual framework, methodological approach, and historical contextualization; part two describes three case studies produced to analyse the forms of and the relations between individuals and school institution. Part one starts from a premise: within the context of declining welfare State in the case of industrialized countries, an important part of urban studies focuses on economic and spatial restructuration. Confronted with the same situation, a part of social sciences shifts to the individuals’ agency and social uncertainty. This research is embedded in the last theoretical description presented above, thus, because it tries to observe urban processes from the perspective of the individual and outside of developed economies. In this sense, Latin America represents a fundamental reference because urban conditions are historically marked by weak institutional arrangements to integrating people and large levels of marginality and exclusion among population. In this scenario individuals’ practices around inclusion-exclusion have an essential meaning in everyday life. Part two offers three study cases in which the relation between individuals and school institutions has been analyzed for the Metropolitan area of Santiago de Chile (MAS). Using different methodological resources an exhaustive account on three levels is presented: i) geo-referencing State intervention in public policies connected with neighborhood and schools to understand the form and extent of socio-urban exclusion in MAS, ii) narrative biographies applied to parents with children attending primary school, in order to reconstruct the familiar process of school selection and describing its impacts on the stabilization of school as an exclusionary device, and iii) autoethnography to describe in detail the temporal dimension involved in stabilizing actions which reinforces social mechanisms of urban integration-exclusion during the last three decades in Chile. A key argument advanced by this research proposes that: the way in which the idea of integration is enacted by people in their biographical careers imprints changes on the institutional orientation and by this way, contributes to the reorganization urban life. The high level of social exclusion in Santiago de Chile is not accountable without considering transformation in all socio-urban institutions, especially the school. No family considers social integration with people from a low social, economical or cultural background as relevant orientation for school selection. This particularity of the Chilean social reality is not derivable from any big capitalistic or modernization processes impacting our cities. Within the light of the thesis findings, I conclude that socio-urban institutions logics must be reassessment under the influences of people actions and representations. I also propose a consideration to major complementarities between urban studies and urban-institutions analysis. The school institutions is not just a sectorial field reserved to the researcher in education, on the contrary, it represent a key entrance to address people’s experience in their institutional urban environments. The re-emergence of social and urban movements in 2010, under the “Arab Spring” or the “Chilean Student Movements”, is not only a demonstration in the public space as result of major global trends. These situations are in essence, for this research, individuals gathering together and calling for recognition and autonomy inside institutional environment that tends to reject them. Similar situation was the focus of the Latin American urban sociology research, within the focus on grassroots and urban social movements at the end of the 1960s and beginning of the 1970s. In both cases, socio-urban institutions, unaware of recognition requirements claimed by inhabitants, are not beyond individual or collective reach. My main concern is to show that socio-urban institutions are constantly re-shaped as a result of individual action, what makes the difference, is the spirit that we all, socially, imprint on the logics of our socio-urban institutions, moving them to inclusion or exclusion. KW - urban studies KW - urban sociology KW - Urban Sociology KW - Individual Sociology KW - Urban Social Movements KW - Socio-urban Exclusion KW - School Institution Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150505-23888 ER - TY - THES A1 - Forler, Christian T1 - Analysis Design & Applications of Cryptographic Building Blocks N2 - This thesis deals with the basic design and rigorous analysis of cryptographic schemes and primitives, especially of authenticated encryption schemes, hash functions, and password-hashing schemes. In the last decade, security issues such as the PS3 jailbreak demonstrate that common security notions are rather restrictive, and it seems that they do not model the real world adequately. As a result, in the first part of this work, we introduce a less restrictive security model that is closer to reality. In this model it turned out that existing (on-line) authenticated encryption schemes cannot longer beconsidered secure, i.e. they can guarantee neither data privacy nor data integrity. Therefore, we present two novel authenticated encryption scheme, namely COFFE and McOE, which are not only secure in the standard model but also reasonably secure in our generalized security model, i.e. both preserve full data inegrity. In addition, McOE preserves a resonable level of data privacy. The second part of this thesis starts with proposing the hash function Twister-Pi, a revised version of the accepted SHA-3 candidate Twister. We not only fixed all known security issues of Twister, but also increased the overall soundness of our hash-function design. Furthermore, we present some fundamental groundwork in the area of password-hashing schemes. This research was mainly inspired by the medial omnipresence of password-leakage incidences. We show that the password-hashing scheme scrypt is vulnerable against cache-timing attacks due to the existence of a password-dependent memory-access pattern. Finally, we introduce Catena the first password-hashing scheme that is both memory-consuming and resistant against cache-timing attacks. KW - Kryptologie KW - symmetric crypto KW - provable security KW - authenticated encryption KW - hash functions KW - password scrambler Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150330-23764 PB - Shaker Verlag ER - TY - THES A1 - Le, Ha Thanh T1 - Behaviour of Rice Husk Ash in Self-Compacting High Performance Concrete N2 - The main objective of this thesis is to investigate the characteristics of rice husk ash RHA) and then its behaviour in self-compacting high performance concrete (SCHPC) with respects to rheological properties, hydration and microstructure development and alkali silica reaction, in comparison with silica fume (SF). The main results show that the RHA is a macro-mesoporous amorphous siliceous material with a very high silica content comparable with SF. The pore size distribution is the most important parameter of RHA besides amorphous silica content. This parameter affects pore volume, specific surface area, and thus the water demand and the pozzolanic reactivity of RHA and its behaviour in SCHPC. The incorporation of RHA decreases filling and passing abilities, but significantly increases plastic viscosity and segregation resistance of SCHPC. Therefore, RHA can be used as a viscosity modifying admixture for SCHPC. The incorporation of RHA increases the superplasticizer adsorption, the superplasticizer saturation dosage, yield stress and plastic viscosity of mortar. Fresh mortar formulated from SCHPC is a shear-thickening material. The incorporation of RHA/SF ecreases the shearthickening degree. The incorporation of RHA/SF increases the degree of cement hydration. SF appears more effective at 3 days possibly due to the better nucleation site effect, whereas RHA dominates at the later ages possibly due to the internal water curing effect. The incorporation of RHA/SF increases the degree of C3S hydration, particularly the C3S hydration rate from 3 to 14 days. The pozzolanic reaction takes place outside and inside RHA particles. The internal pozzolanic eaction products consolidate the pores inside RHA particles rather than contribute to the pore refinement in the cement matrix. In the presence of the high alkali concentration, RHA particles act as microreactive aggregates and react with alkali hydroxide to generate the expansive alkali silica reaction products. Increasing the particle size and temperature increases the alkali silica reactivity of RHA. The mechanism for the successive pozzolanic and alkali silica reactions of RHA is theorized. Additionally, a new simple mix design method is proposed for SCHPC containing various supplementary cementitious materials, i.e. RHA, SF, fly ash and limestone powder. KW - Werkstoffkunde KW - Rice husk ash KW - Macro-mesoporous structure KW - Internal pozzolanic reactivity KW - external pozzolanic reactivity KW - Mix design method KW - Rheological property KW - Hydration and microstructure KW - Alkali silica reaction KW - Supplementary cementitious materials KW - Self-compacting high performance concrete Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150310-23730 SN - 978-3-00-048928-0 PB - Bauhaus-Universität Weimar, F.A. Finger- Institut für Baustoffkunde, Professur Werkstoffe des Bauens CY - Weimar ER - TY - THES A1 - Chen, Pu T1 - Die Reise der Zeichen - Eine Studie zur symbolischen Bildwelt der Xiyü-Kultur an der Seidenstraße N2 - The present study focuses on the traditional visual Xiyu-Signs of various ethnic groups with the example of Xinjiang in northwest China, along the ancient path of the Silk Road. The research should be understood as an experiment to a systematic presentation of the symbolic visual world in Xinjiang and therefore in a broader sense as an experiment to preserve the endangered Xiyu-Cultural Heritage. Due to the profound change in China and the Go-West-Strategy of China’s economic programme an efficient way must be found to bring modernization and tradition in harmony. This study describes, analyses and evaluates exemplarily, how signs and symbols of knowledge and culture have been mixed between eastern and western cultures along the Silk Road in Xinjiang. It displays how they have been transferred and how far the Xiyu-Culture reflects, that Xinjiang was a meeting point of eastern and western cultures. In the process of my research three main questions arose: Firstly, what can the experience model of the ancient Silk Road contribute to the understanding of cultural development in today’s information age? Secondly, what does cultural diversity mean for communication in Xinjiang? Is there an increase of media technology in the field of visual communication because of international influences? Thirdly, how can Xinjiang benefit from the opportunities given by the Go-West-Strategy of China’s economic programme in an increasingly globalized world and find a balance between culture and economic prosperity? Therefore, this study uses a method that integrates a cultural-anthropological perspective. Characteristics of the traditional visual Xiyu-Signs, their significance for the ethnic groups in Xinjiang and cultural exchanges between Europe and Asia are discussed based on a field work, and the particular influence of trade and transport routes is presented. The visual signs of the Xiyu-Culture are shown from the time before the Islamization to today’s Islamic period. The research shows that the signs are not place-bound cultural phenomena or local tradition; they are rather influenced by regional, national and international cultures consciously or unconsciously. They are a result of cultural communication. Finally the signs of Xiyu-Culture of Xinjiang are thoroughly researched with the Go-West-Strategy of the Chinese government. Economic development brings to Xinjiang not only modernization and prosperity, but also a cultural and ecological imbalance. Mankind formed everything into structure, what he perceives around him, with signs. The Xiyu-Signs create a visual structure. The Xiyu-Culture still has influence on the lifestyle of the ethnic groups in Xinjiang. Today, the confrontation between the traditional Xiyu-Culture and economic development has led to a serious conflict in Xinjiang. This study is a critical interpretation of the current situation of Xiyu-Culture and the Chinese economic program in Xinjiang. It also contributes to the analysis of the hitherto insufficiently recognized interactions between history, culture, politics and economics of cultural globalization in Xinjiang. N2 - Kurzfassung Die vorliegende Studie untersucht die traditionellen Xiyü-Zeichen im Visuellen verschiedener Volksgruppen am Beispiel Xinjiangs im Nordwesten Chinas, wo einst die alte Seidenstraße entlangführte. Die Untersuchung versteht sich als ein Versuch der systematischen Darstellung der symbolischen Bildwelt in Xinjiang und damit im weiteren Sinne auch als ein Versuch, das Xiyü-Kulturerbe zu bewahren, das angesichts des tiefgreifenden Wandels in China und der Go-West-Strategie des chinesischen Wirtschaftsprogramms, welches sich auf die weiten Westgebiete Chinas bezieht, in Gefahr geraten ist. Es muss ein Weg gefunden werden, Modernisierung und Tradition in Einklang zu bringen. Diese Studie beschreibt, analysiert und bewertet exemplarisch, wie sich Zeichen und Symbole des Wissens und der Kultur entlang der Seidenstraße in Xinjiang zwischen den östlichen und westlichen Kulturen vermischt haben, wie sie übertragen wurden und inwieweit die Xiyü-Kultur reflektiert, dass Xinjiang ein Treffpunkt zwischen östlichen und westlichen Einflüssen war. In der Annährung an dieses Forschungsziel werden drei Hauptfragen zusammengefasst: Erstens, was kann das Erfahrungsmodell der alten Seidenstraße zum Verständnis der kulturellen Entwicklung im heutigen Informationszeitalter beitragen? Zweitens, was bedeutet Vielfalt für die kulturelle Kommunikation in Xinjiang? Steigen die Medienereignisse der visuellen Kommunikation und die internationalen Einflüsse an? Drittens, wie kann Xinjiang die Chancen der Go-West-Strategie des chinesischen Wirtschaftsprogramms in einer zunehmend globalisierten Welt nutzen und in der zukünftigen weltwirtschaftlichen Entwicklung wieder Vitalität zeigen? Um sich auf diese Weise den Antworten zu nähern, verwendet diese Studie einen Ansatz, der eine kulturanthropologische Perspektive integriert. Auf Grundlage einer Feldstudie werden Eigenschaften der traditionellen visuellen Xiyü-Zeichen, ihre Bedeutung für die ethnischen Volksgruppen Xinjiangs und den kulturellen Austausch zwischen Europa und Asien diskutiert und der besondere Einfluss von Handel und Verkehrswegen aufgezeigt. Die visuellen Zeichenformen der Xiyü-Kultur wurden von der Zeit vor der Islamisierung bis hin zur heutigen islamischen Zeit dargestellt. Die Forschung zeigt, dass die Zeichen kein ortsgebundenes Kulturphänomen oder eine lokale Tradition sind, vielmehr werden sie von regionalen, nationalen und internationalen Kulturkreisen bewusst oder unbewusst beeinflusst. Sie sind ein Ergebnis kultureller Kommunikation. Schließlich setzt sich die Studie mit den Zeichen der Xiyü-Kultur Xinjiangs in Relation mit der Go-West-Strategie der chinesischen Regierung auseinander. Die wirtschaftliche Entwicklung bringt für Xinjiang nicht nur Modernisierung und Wohlstand, sondern auch ein kulturelles und ökologisches Ungleichgewicht. Der Mensch strukturiert alles, was er in seiner Umgebung wahrnimmt, mit Zeichen. Die Xiyü-Zeichen schaffen eine visuelle Strukturierung. Die Xiyü-Kultur hat nach wie vor Einfluss auf die Lebensweise der ethnischen Gruppen in Xinjiang. Heute hat die Konfrontation zwischen der traditionellen Xiyü-Kultur und der wirtschaftlichen Entwicklung zu einem ernsthaften Konflikt in Xinjiang geführt. Diese Studie versteht sich als eine kritische Interpretation der aktuellen Situation der Xiyü-Kultur bzw. des chinesischen Wirtschaftsprogramms in Xinjiang. Sie will darüber hinaus einen Beitrag leisten zur Analyse der bislang nur unzureichend erfassten Wechselwirkungen zwischen Geschichte, Kultur, Politik und Wirtschaft in der kulturellen Globalisierung in Xinjiang. KW - Seidenstraße KW - Xiyü-Kultur KW - symbolische Bildwelt KW - Seidenstraße KW - Xiyü-Kultur KW - Kulturaustausch Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150225-23553 ER - TY - THES A1 - Chen, Hsi-Jen T1 - Kulturelle Unterschiede bei der Nutzung von Smartphones in Deutschland, China und Taiwan N2 - Theoretischer Teil: Durch den Vergleich der Daten, die sowohl von den Instituten bzw. Statistikunternehmen z. B. Google, Bundesnetzagentur und Statista in Deutschland, 中国互联网络信息中心 in China, FIND in Taiwan usw. zur Verfügung gestellt wurden, als auch durch die von mir durchgeführten Umfragen in den jeweiligen Ländern, sowie durch die Interviews in Weimar, zeigen sich die kulturellen Unterschiede sowie die Gemeinsamkeiten bei der Nutzung des Smartphones. Darüber hinaus ergaben sich noch einige Konsequenzen bei den Interpretationen dieser Ergebnisse, die eng mit der Entstehung der kulturellen Unterschiede zusammenhängen. Praktischer Teil: Der erste Entwurf ist eine visuelle Tastatur. Um die Bildschirmtastatur zu verbessern, versucht type right ! (der Name meines Entwurfs) das Problem von Vertippen beim Eingeben zu lösen. type right ! hat zwei Schwerpunkte: 1. geänderte Positionen der Buchstaben und Zeichen und 2. geänderte Form der Taste. Der zweite Entwurf handelt von einem Konzept einer App für die Integrationsmöglichkeit der Kommunikation. KW - Smartphone KW - Kultur KW - Actor-Network-Theory KW - Apparatgeist-Theorie KW - westliche Kultur KW - asiatische Kultur KW - Smartphone KW - Akteur-Netzwerk-Theorie KW - Apparatgeist-Theorie Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150223-23517 ER - TY - THES A1 - Sucker, Katharina T1 - Communities in discourse and space. Towards a spatial dialectic in gated residential developments T1 - Diskurse der Identität auf dem Immobilienmarkt. Eine Untersuchung anhand von Gated Communities in Istanbul. N2 - This research projects deals with the discoursivity of spatial production. By looking at contemporary residential development in the city of Istanbul, I will examine the reciprocity of the material production of space on one hand, and social discourses on the other, in order to make a contribution to how physical space can be used as a source of research in urban studies. In real estate marketing social discourses are used as a source of reference for place branding or identity design. Branding concepts therefore relate to how social groups imagine their position or future position in society, imaginaries that are continuously influenced and changed by social dynamics within the city but also from the outside. How such urban identities are formed and it what way they relate to the urban environment is crucial to a wide spectrum of social and cultural science. The constitutive role urban space attains has been described and analysed in much detail. Such scrutiny however has yet to be applied to the visual and communicative forms of engagement, the build environment partakes in the formation and change of social discourses. N2 - Diese Dissertation setzt sich mit den Mechanismen diskursiver Stadtproduktion auseinander. Anhand einer Analyse aktueller Wohnbauprojekte in Istanbul wird untersucht, wie materielle Stadtproduktion auf der einen Seite und gesellschaftliche Diskurse auf der anderen ineinandergreifen, sich gegenseitig bedingen und beeinflussen. Gesellschaftsdiskurse tauchen im Stadtmarketing als Diskurse urbaner Identität auf. Sie stehen in engem Bezug zu einer idealisierten Vorstellung der eigenen gesellschaftlichen Position, werden aber auch durch Bewertungen von außen geprägt und verändert. Die Formation solcher Identitäten im Bereich des Stadtmarketing sowie ihre räumliche Umsetzung in Prozessen der Stadtproduktion ist von zentralem Interesse in der Stadtsoziologie. Die konstituierende Bedeutung des Raumes ist dabei weitestgehend erforscht worden, nicht jedoch die verändernde Wirkung, die städtischer Raum auf gesellschaftliche Diskurse hat - und umgekehrt. Dieser Komponente soll sich das vorliegende Forschungsvorhaben widmen. KW - architecture KW - gated community KW - discourse analysis KW - Istanbul KW - Architektur Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20150206-23466 ER -