UB Weimar OPUS 4.6.3

Determination of the Temperature of Dissipative Warming and Parameters of Fracture in Elastomers with using of Singular Finite Elements (1997)

Êirinhevsky, V. V. ; Dîkhnyak, B. M. ; Êirichevsky, R. V. ; Êîzub, Y. G.

For modeling of singular fields of stresses and deformations in elasters with a crack is offered to use of three-dimesional a special finite element. Weak compessible of elasters is taken into account on the basis of threefold approximation of fields of displacements, deformations and function of volume change. At intensive cyclic loading of the elastomer constructions with a crack it is necessary to take into account warming and large deformations at the crack top. The stress-deformed state elasters with a crack is determined from the decision of a nonlinear problem by a modified method Newton-Kantorovich. Account stress intensity factors for a rectangular plate with a various arrangement of a through crack is executed. Process of development of a surface crack and dissipative warming in prismatic a element of shift is investigated.

Die Herausbildung schöpferischer Fähigkeiten am Bauhaus : eine Betrachtung aus hochschulpädagogischer Sicht (1979)

Zrost, Sibylle

Wissenschaftliches Kolloquium vom 27. bis 29. Juni 1979 in Weimar an der Hochschule für Architektur und Bauwesen zum Thema: '60 Jahre Gründung Bauhaus'

Virtual constructions : the standards of utopia (2003)

Zinsmeister, Annett

Wissenschaftliches Kolloquium vom 24. bis 27. April 2003 in Weimar an der Bauhaus-Universität zum Thema: ‚MediumArchitektur - Zur Krise der Vermittlung'

Architektur und Macht : 6. Internationales Bauhaus-Kolloquium Weimar 1992, 18.6.-21.6.1992 (1992)

Zimmermann, Gerd ; Korrek, Norbert

Wissenschaftliches Kolloquium vom 18. bis 21. Juni 1992 in Weimar an der Hochschule für Architektur und Bauwesen zum Thema: ‚Architektur und Macht'

Die Realität des Imaginären : Architektur und das digitale Bild (2008)

Zimmermann, Gerd

Wissenschaftliches Kolloquium vom 19. bis 22. April 2007 in Weimar an der Bauhaus-Universität zum Thema: ‚Die Realität des Imaginären. Architektur und das digitale Bild'

Medium Architektur : zur Krise der Entwicklung ; Vorwort zum 9. Internationalen Bauhaus-Kolloquium Weimar 2003 (2003)

Zimmermann, Gerd

Wissenschaftliches Kolloquium vom 24. bis 27. April 2003 in Weimar an der Bauhaus-Universität zum Thema: ‚MediumArchitektur - Zur Krise der Vermittlung'

Medium Architektur (2003)

Zimmermann, Gerd

Wissenschaftliches Kolloquium vom 24. bis 27. April 2003 in Weimar an der Bauhaus-Universität zum Thema: ‚MediumArchitektur - Zur Krise der Vermittlung'

Über Symbolformen des "High-Tech" in der Architektur (1990)

Zimmermann, Gerd

Wissenschaftliches Kolloquium vom 27. bis 30. Juni 1989 in Weimar an der Hochschule für Architektur und Bauwesen zum Thema: ‚Produktivkraftentwicklung und Umweltgestaltung. Sozialer und wissenschaftlich-technischer Fortschritt in ihren Auswirkungen auf Architektur und industrielle Formgestaltung in unserer Zeit. Zum 100. Geburtstag von Hannes Meyer'

Architekturen der Macht (1992)

Zimmermann, Gerd

Wissenschaftliches Kolloquium vom 18. bis 21. Juni 1992 in Weimar an der Hochschule für Architektur und Bauwesen zum Thema: ‚Architektur und Macht'

Techno-Fiction : Einführungsvortrag (1997)

Zimmermann, Gerd

Wissenschaftliches Kolloquium vom 27. bis 30. Juni 1996 in Weimar an der Bauhaus-Universität zum Thema: ‚Techno-Fiction. Zur Kritik der technologischen Utopien'

Bild und Raum (2008)

Zierold, Sabine

Wissenschaftliches Kolloquium vom 19. bis 22. April 2007 in Weimar an der Bauhaus-Universität zum Thema: ‚Die Realität des Imaginären. Architektur und das digitale Bild'

Das Virtuelle im Realen : der virtuelle Raum als Entgrenzung des physischen Raumes der Architektur (2003)

Zierold, Sabine

Wissenschaftliches Kolloquium vom 24. bis 27. April 2003 in Weimar an der Bauhaus-Universität zum Thema: ‚MediumArchitektur - Zur Krise der Vermittlung'

A coupled thermo-hydro-mechanical model of jointed hard rock for compressed air energy storage (2014)

Zhuang, Xiaoying ; Huang, Runqiu ; Rabczuk, Timon ; Liang, C.

A coupled thermo-hydro-mechanical model of jointed hard rock for compressed air energy storage

A coupled thermo-hydro-mechanical model of jointed hard rock for compressed air energy storage (2014)

Zhuang, Xiaoying ; Huang, Runqiu ; Liang, Chao ; Rabczuk, Timon

Renewable energy resources such as wind and solar are intermittent, which causes instability when being connected to utility grid of electricity. Compressed air energy storage (CAES) provides an economic and technical viable solution to this problem by utilizing subsurface rock cavern to store the electricity generated by renewable energy in the form of compressed air. Though CAES has been used for over three decades, it is only restricted to salt rock or aquifers for air tightness reason. In this paper, the technical feasibility of utilizing hard rock for CAES is investigated by using a coupled thermo-hydro-mechanical (THM) modelling of nonisothermal gas flow. Governing equations are derived from the rules of energy balance, mass balance, and static equilibrium. Cyclic volumetric mass source and heat source models are applied to simulate the gas injection and production. Evaluation is carried out for intact rock and rock with discrete crack, respectively. In both cases, the heat and pressure losses using air mass control and supplementary air injection are compared.

Mechanical properties of three types of carbon allotropes (2013)

Zhao, Jun-Hua ; Wei, Ning ; Fan, Z. ; Jiang, Jin-Wu ; Rabczuk, Timon

Mechanical properties of three types of carbon allotropes

A comparative study of two molecular mechanics models based on harmonic potentials (2013)

Zhao, Jun-Hua ; Wang, L. ; Jiang, Jin-Wu ; Wang, Z. ; Guo, Wanlin ; Rabczuk, Timon

A comparative study of two molecular mechanics models based on harmonic potentials

Continuum modeling of the cohesive energy for the interfaces between _lms, spheres, coats and substrates (2015)

Zhao, Jun-Hua ; Lu, Lixin ; Zhang, Zhiliang ; Guo, Wanlin ; Rabczuk, Timon

Continuum modeling of the cohesive energy for the interfaces between _lms, spheres, coats and substrates

Binding energy and mechanical stability of single- and multi-walled carbon nanotube serpentines (2014)

Zhao, Jun-Hua ; Lu, Lixin ; Rabczuk, Timon

Binding energy and mechanical stability of single- and multi-walled carbon nanotube serpentines

Tension-induced phase transition of single-layer molybdenum disulphide (MoS2) at low temperatures (2014)

Zhao, Jun-Hua ; Kou, Liangzhi ; Jiang, Jin-Wu ; Rabczuk, Timon

Tension-induced phase transition of single-layer molybdenum disulphide (MoS2) at low temperatures

A theoretical analysis of cohesive energy between carbon nanotubes, graphene and substrates (2014)

Zhao, Jun-Hua ; Jiang, Jin-Wu ; Jia, Yue ; Guo, Wanlin ; Rabczuk, Timon

Explicit solutions for the cohesive energy between carbon nanotubes, graphene and substrates are obtained through continuum modeling of the van der Waals interaction between them. The dependence of the cohesive energy on their size, spacing and crossing angles is analyzed. Checking against full atom molecular dynamics calculations and available experimental results shows that the continuum solution has high accuracy. The equilibrium distances between the nanotubes, graphene and substrates with minimum cohesive energy are also provided explicitly. The obtained analytical solution should be of great help for understanding the interaction between the nanostructures and substrates, and designing composites and nanoelectromechanical systems.

Binding energy and mechanical stability of two parallel and crossing carbon nanotubes (2015)

Zhao, Jun-Hua ; Jia, Yue ; Wei, Ning ; Rabczuk, Timon

Binding energy and mechanical stability of two parallel and crossing carbon nanotubes

An analytical molecular mechanics model for the elastic properties of crystalline polyethylene (2012)

Zhao, Jun-Hua ; Guo, Wanlin ; Rabczuk, Timon

We present an analytical model to relate the elastic properties of crystalline polyethylene based on a molecular mechanics approach. Along the polymer chains direction, the united-atom (UA) CH2-CH2 bond stretching, angle bending potentials are replaced with equivalent Euler-Bernoulli beams. Between any two polymer chains, the explicit formulae are derived for the van der Waals interaction represented by the linear springs of different stiffness. Then, the nine independent elastic constants are evaluated systematically using the formulae. The analytical model is finally validated by present united-atom molecular dynamics (MD) simulations and against available all-atom molecular dynamics results in the literature. The established analytical model provides an efficient route for mechanical characterization of crystalline polymers and related materials.

The tensile and shear failure behavior dependence on chain length and temperature in amorphous polymers (2015)

Zhao, Jiyun ; Lu, Lixin ; Rabczuk, Timon

The tensile and shear failure behavior dependence on chain length and temperature in amorphous polymers

Coarse-grained potentials of single-walled carbon nanotubes (2014)

Zhao, Jiyun ; Jiang, Jin-Wu ; Wang, L. ; Guo, Wanlin ; Rabczuk, Timon

Coarse-grained potentials of single-walled carbon nanotubes

Implicit implementation of the nonlocal operator method: an open source code (2022)

Zhang, Yongzheng ; Ren, Huilong

In this paper, we present an open-source code for the first-order and higher-order nonlocal operator method (NOM) including a detailed description of the implementation. The NOM is based on so-called support, dual-support, nonlocal operators, and an operate energy functional ensuring stability. The nonlocal operator is a generalization of the conventional differential operators. Combined with the method of weighed residuals and variational principles, NOM establishes the residual and tangent stiffness matrix of operate energy functional through some simple matrix without the need of shape functions as in other classical computational methods such as FEM. NOM only requires the definition of the energy drastically simplifying its implementation. The implementation in this paper is focused on linear elastic solids for sake of conciseness through the NOM can handle more complex nonlinear problems. The NOM can be very flexible and efficient to solve partial differential equations (PDEs), it’s also quite easy for readers to use the NOM and extend it to solve other complicated physical phenomena described by one or a set of PDEs. Finally, we present some classical benchmark problems including the classical cantilever beam and plate-with-a-hole problem, and we also make an extension of this method to solve complicated problems including phase-field fracture modeling and gradient elasticity material.

Nonlocal dynamic Kirchhoff plate formulation based on nonlocal operator method (2022)

Zhang, Yongzheng

In this study, we propose a nonlocal operator method (NOM) for the dynamic analysis of (thin) Kirchhoff plates. The nonlocal Hessian operator is derived based on a second-order Taylor series expansion. The NOM does not require any shape functions and associated derivatives as ’classical’ approaches such as FEM, drastically facilitating the implementation. Furthermore, NOM is higher order continuous, which is exploited for thin plate analysis that requires C1 continuity. The nonlocal dynamic governing formulation and operator energy functional for Kirchhoff plates are derived from a variational principle. The Verlet-velocity algorithm is used for the time discretization. After confirming the accuracy of the nonlocal Hessian operator, several numerical examples are simulated by the nonlocal dynamic Kirchhoff plate formulation.

Load transfer of graphene/carbon nanotube/polyethylene hybrid nanocomposite by molecular dynamics simulation (2014)

Zhang, Yancheng ; Zhuang, Xiaoying ; Muthu, Jacob ; Mabrouki, Tarek ; Fontaine, Michaël ; Gong, Yadong ; Rabczuk, Timon

Load transfer of graphene/carbon nanotube/polyethylene hybrid nanocomposite by molecular dynamics simulation

An analytical solution on the interface debonding for large diameter carbon nanotube-reinforced composite with functionally graded variation interphase (2013)

Zhang, Yancheng ; Zhao, Jun-Hua ; Jia, Yue ; Mabrouki, Tarek ; Gong, Yadong ; Wei, Ning ; Rabczuk, Timon

An analytical solution on the interface debonding for large diameter carbon nanotube-reinforced composite with functionally graded variation interphase

Effects of the dispersion of polymer wrapped two neighbouring single walled carbon nanotubes (SWNTs) on nanoengineering load transfer (2013)

Zhang, Yancheng ; Zhao, Jiyun ; Wei, Ning ; Jiang, Jin-Wu ; Rabczuk, Timon

Effects of the dispersion of polymer wrapped two neighbouring single walled carbon nanotubes (SWNTs) on nanoengineering load transfer

Quasi-analytical solution for the stable system of the multi-layer folded graphene wrinkles (2013)

Zhang, Yancheng ; Wei, Ning ; Zhao, Jun-Hua ; Gong, Yadong ; Rabczuk, Timon

Quasi-analytical solution for the stable system of the multi-layer folded graphene wrinkles

A dynamic XFEM formulation for crack identification (2016)

Zhang, Chao ; Wang, Cuixia ; Lahmer, Tom ; He, Pengfei ; Rabczuk, Timon

A dynamic XFEM formulation for crack identification

Multiple cracks identification for piezoelectric structures (2017)

Zhang, Chao ; Nanthakumar, S.S. ; Lahmer, Tom ; Rabczuk, Timon

Multiple cracks identification for piezoelectric structures

Thermal conductivity of graphene nanoribbons under shear deformation: A molecular dynamics simulation (2017)

Zhang, Chao ; Hao, Xiao-Li ; Wang, Cui-Xia ; Wei, Ning ; Rabczuk, Timon

Tensile strain and compress strain can greatly affect the thermal conductivity of graphene nanoribbons (GNRs). However, the effect of GNRs under shear strain, which is also one of the main strain effect, has not been studied systematically yet. In this work, we employ reverse nonequilibrium molecular dynamics (RNEMD) to the systematical study of the thermal conductivity of GNRs (with model size of 4 nm × 15 nm) under the shear strain. Our studies show that the thermal conductivity of GNRs is not sensitive to the shear strain, and the thermal conductivity decreases only 12–16% before the pristine structure is broken. Furthermore, the phonon frequency and the change of the micro-structure of GNRs, such as band angel and bond length, are analyzed to explore the tendency of thermal conductivity. The results show that the main influence of shear strain is on the in-plane phonon density of states (PDOS), whose G band (higher frequency peaks) moved to the low frequency, thus the thermal conductivity is decreased. The unique thermal properties of GNRs under shear strains suggest their great potentials for graphene nanodevices and great potentials in the thermal managements and thermoelectric applications.

Optimized Models of Modes Choice for Displacement of technical Systems Objects (1997)

Zhak, S. V. ; Sidorenko, V. S.

The effectiveness of working processes accomplished by various technological machines to a large extend depends on working quality of supply, transporting and orientating mechanisms which are very often produced as positional hydro-mechanical systems. The choice of their best type and regimes of work requires construction and analysis of models of their optimum steering which are complicated by nonlinearness, multy-criterialness of problem and also by occasional outbreaks of parameters and moments of steering regime changing. It was developed the common structure of such systems allowing within common scheme to vary the complexity degree of PHMS and the methods of inhibitory efforts supplement. For some systems which are complicated in series (from two-measured linear system to nine-measured non-linear) puzzles of the most fast zero-ambit getting are solved and two-criterial problems are analyzed. (T-min-speed, Z(T)- accuracy). There are suggested the computing procedures of optimum PHMS synthesis. The effectiveness of accepted methods of solving is asserted by the analogy of the results of gradually complicated models investigation and by their good analogy with the natural experiment. It was exposed the sense of heuristic methods of improving of approximately optimum steering, their elaboration on the base of theoretical models. The basic methods of optimum PGMS construction were also nominated.

The development of a damage tolerance concept for railway components and its demonstration for a railway axle (2005)

Zerbst, U. ; Vormwald, M. ; Andersch, C. ; Mädler, K. ; Pfuff, M.

The development of a damage tolerance concept for railway components and its demonstration for a railway axle

Database of Best Practices and Decision Support Web-based System for Construction Innovation (2004)

Zavadskas, Edmundas Kazimieras ; Kaklauskas, Arturas ; Viteikiene, Milda

Many construction and facilities management Web sites can be found on the Internet. The interested parties on construction and facilities management Web sites can find databases of best practices, calculators, analyzers, software, expert and decision support systems, neural networks, etc. Technological innovation mainly through changes in the availability of information and communication technology inclusive databases of best practices, calculators, analyzers, software, neural networks, decision support and expert systems that have been provided by a variety of new services developed by the construction and facilities management sectors. Most of all calculators, analyzers, software, decision support and expert systems, neural networks and on-line systems seek to find out how to make the most economic decisions and most of all these decisions are intended only for economic objectives. Alternatives under evaluation have to be evaluated not only from the economic position, but take into consideration qualitative, technical, technological and other characteristics as well. Based on the analysis of the existing calculators, analyzers, information, expert and decision support systems, neural networks and in order to determine most efficient versions of best practices a Decision Support Web-Based System for Construction Innovation (IDSS) was developed by Vilnius Gediminas Technical University.

Civil Engineering Decision Support Systems in Lithuania (2004)

Zavadskas, Edmundas Kazimieras ; Kaklauskas, Arturas

Civil engineering decision support systems (construction, building life cycle, refurbishment, total quality management, innovation, etc.) created in Lithuania are described in this paper. The above decision support systems comprise of the following constituent parts: data (database and its management system), models (model base and its management system) and a user interface. Presentation of information in databases may be in conceptual (digital, textual, graphical, photographic, video) and quantitative forms. Quantitative information presented involves criteria systems and subsystems, units of measurement, values and initial weight fully defining the variants provided. The databases were developed providing a multiple criteria analysis of alternatives from economical, infrastructure, technical, technological, qualitative, legislative, social and other perspectives. This information is provided in a user-oriented way. Since the analysis of alternatives is usually performed by taking into account economical, infrastructure, technical, technological, qualitative and other factors, a model-base include models which enable a decision maker to carry out a comprehensive analysis of the variants available and make a proper choice. These systems, related questions and practical case study were analysed the paper.

Formal Mutations (2008)

Zarzycki, Andrzej

Wissenschaftliches Kolloquium vom 19. bis 22. April 2007 in Weimar an der Bauhaus-Universität zum Thema: ‚Die Realität des Imaginären. Architektur und das digitale Bild'

Underlying Processes of an Inverted Personalization Effect in Multimedia Learning – An Eye-Tracking Study (2017)

Zander, Steffi ; Wetzel, Stefanie ; Kühl, Tim ; Bertel, Sven

One of the frequently examined design principles recommendations in multimedia learning is the personalization principle. Based on empirical evidence this principle states that using personalised messages in multimedia learning is more beneficial than using formal language (e.g. using ‘you’ instead of ‘the’). Although there is evidence that these slight changes in regard to the language style affect learning, motivation and the perceived cognitive load, it remains unclear, (1) whether the positive effects of personalised language can be transferred to all kinds of content of learning materials (e.g. specific potentially aversive health issues) and (2) which are the underlying processes (e.g. attention allocation) of the personalization effect. German university students (N= 37) learned symptoms and causes of cerebral haemorrhages either with a formal or a personalised version of the learning material. Analysis revealed comparable results to the few existing previous studies, indicating an inverted personalization effect for potentially aversive learning material. This effect was specifically revealed in regard to decreased average fixation duration and the number of fixations exclusively on the images in the personalised compared to the formal version. This result can be seen as indicators for an inverted effect of personalization on the level of visual attention.

Das dynamische Verhalten von Eisenbahnbrücken mit kurzer Spannweite - numerische und experimentelle Untersuchungen (2008)

Zabel, Volkmar ; Brehm, Maik

Das dynamische Verhalten von Eisenbahnbrücken mit kurzer Spannweite - numerische und experimentelle Untersuchungen

An application of discrete wavelet analysis and connection coefficients to parametric system identification (2005)

Zabel, Volkmar

An application of discrete wavelet analysis and connection coefficients to parametric system identification

A Meshless Adaptive Multiscale Method for Fracture (2015)

Yang, Shih-Wei ; Budarapu, Pattabhi Ramaiah ; Mahapatra, D.R. ; Bordas, Stéphane Pierre Alain ; Zi, Goangseup ; Rabczuk, Timon

A Meshless Adaptive Multiscale Method for Fracture

Obsolete ways of designing : scale models at the time of digital media technologies (2008)

Yaneva, Albena

Wissenschaftliches Kolloquium vom 19. bis 22. April 2007 in Weimar an der Bauhaus-Universität zum Thema: ‚Die Realität des Imaginären. Architektur und das digitale Bild'

An Evaluation System for Steel Structures of Hydroelectric Power Stations based on Fault Tree Analysis and Performance Maps (2004)

Yabuki, Nobuyoshi ; Yoshimura, Yutaka

This paper presents an evaluation system for steel structures of hydroelectric power stations, including hydraulic gates and penstocks, based on Fault Tree Analyasis (FTA) and performance maps. This system consists of fault tree diagrams of FTA, performance maps, design and analysis systems, and engineerin databases. These four modules are integrated by appropriate hyperlinks so that the user of this system can use it easily and seamlessly. A well developed system was applied to some illustrative example cases, and they showed that the developed methodology and system worked well and the users found the system useful and effective for their maintenance tasks at powerstations.

A Steel Bridge Design System Architecture using VR-CAD and Web Service-based Multi-Agents (2004)

Yabuki, Nobuyoshi ; Kotani, Jun ; Shitani, Tomoaki

This paper presents a new design environment based on Multi-Agents and Virtual Reality (VR). In this research, a design system with a virtual reality function was developed. The virtual world was realized by using GL4Java, liquid crystal shutter glasses, sensor systems, etc. And the Multi-Agent CAD system with product models, which had been developed before, was integrated with the VR design system. A prototype system was developed for highway steel plate girder bridges, and was applied to a design problem. The application verified the effectiveness of the developed system.

High-quality construction of analysis-suitable trivariate NURBS solids by reparameterization methods (2014)

Xu, G. ; Mourrain, B. ; Galligo, A. ; Rabczuk, Timon

High-quality construction of analysis-suitable trivariate NURBS solids by reparameterization methods

Assessing Essential Qualities of Urban Space with Emotional and Visual Data Based on GIS Technique (2016)

Xin, Li ; Hijazi, Ihab Hamzi ; König, Reinhard ; Lv, Zhihan ; Zhong, Chen ; Schmitt, Gerhard

Finding a method to evaluate people’s emotional responses to urban spaces in a valid and objective way is fundamentally important for urban design practices and related policy making. Analysis of the essential qualities of urban space could be made both more effective and more accurate using innovative information techniques that have become available in the era of big data. This study introduces an integrated method based on geographical information systems (GIS) and an emotion-tracking technique to quantify the relationship between people’s emotional responses and urban space. This method can evaluate the degree to which people’s emotional responses are influenced by multiple urban characteristics such as building shapes and textures, isovist parameters, visual entropy, and visual fractals. The results indicate that urban spaces may influence people’s emotional responses through both spatial sequence arrangements and shifting scenario sequences. Emotional data were collected with body sensors and GPS devices. Spatial clustering was detected to target effective sampling locations; then, isovists were generated to extract building textures. Logistic regression and a receiver operating characteristic analysis were used to determine the key isovist parameters and the probabilities that they influenced people’s emotion. Finally, based on the results, we make some suggestions for design professionals in the field of urban space optimization.

News from Eurotopia : a message in a bottle between Manifesto and history by Moholy-Nagy (2003)

Wyss, Beat

Wissenschaftliches Kolloquium vom 24. bis 27. April 2003 in Weimar an der Bauhaus-Universität zum Thema: ‚MediumArchitektur - Zur Krise der Vermittlung'

The queer gaze (2003)

Wray, Tim

Wissenschaftliches Kolloquium vom 24. bis 27. April 2003 in Weimar an der Bauhaus-Universität zum Thema: ‚MediumArchitektur - Zur Krise der Vermittlung'

Das architektonische Denken Mies van der Rohes und die Gestaltungsperspektiven in der Architektur (1987)

Woltschok, Juri

Wissenschaftliches Kolloquium vom 24. bis 26. Juni 1986 in Weimar an der Hochschule für Architektur und Bauwesen zum Thema: 'Der wissenschaftlich-technische Fortschritt und die sozial-kulturellen Funktionen von Architektur und industrieller Formgestaltung in unserer Epoche'

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