@misc{VollmerMichel, author = {Vollmer, Lisa and Michel, Boris}, title = {Wohnen in der Klimakrise. Die Wohnungsfrage als {\"o}kologische Frage: Aufruf zur Debatte}, series = {s u b \ u r b a n. zeitschrift f{\"u}r kritische stadtforschung}, volume = {2020}, journal = {s u b \ u r b a n. zeitschrift f{\"u}r kritische stadtforschung}, number = {Band 8, Heft 1/2}, publisher = {Sub\urban e.V.}, address = {Leipzig}, doi = {10.36900/suburban.v8i1/2.552}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20210122-43327}, pages = {163 -- 166}, abstract = {Die Verbindung der sozialen und der {\"o}kologischen Frage ist eine der zentralen Herausforderungen linker Politik und kritisch-engagierter Wissenschaft heute. Daf{\"u}r, wie wenig das bisher gelingt, sind die {\"o}ffentlichen und wissenschaftlichen Diskussionen um die Wohnungsfrage gute Beispiele. Dieser Aufruf ist eine Einladung an den kollektiven Wissensschatz aus Wissenschaft und Aktivismus, die unterschiedlichen Aspekte der {\"o}kologischen Wohnungsfrage, die bisher stark fragmentiert behandelt werden, in einzelnen Beitr{\"a}gen weiter auszuf{\"u}hren und auf ihren strukturellen Zusammenhang mit der sozialen Wohnungsfrage hin zu beleuchten.}, subject = {Wohnen}, language = {de} } @article{Buschow, author = {Buschow, Christopher}, title = {Why Do Digital Native News Media Fail? An Investigation of Failure in the Early Start-Up Phase}, series = {Media and Communication}, volume = {2020}, journal = {Media and Communication}, number = {Volume 8, Issue 2}, publisher = {Cogitatio Press}, address = {Lissabon}, doi = {10.17645/mac.v8i2.2677}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20200417-41347}, pages = {51 -- 61}, abstract = {Digital native news media have great potential for improving journalism. Theoretically, they can be the sites where new products, novel revenue streams and alternative ways of organizing digital journalism are discovered, tested, and advanced. In practice, however, the situation appears to be more complicated. Besides the normal pressures facing new businesses, entrepreneurs in digital news are faced with specific challenges. Against the background of general and journalism specific entrepreneurship literature, and in light of a practice-theoretical approach, this qualitative case study research on 15 German digital native news media outlets empirically investigates what barriers curb their innovative capacity in the early start-up phase. In the new media organizations under study here, there are—among other problems—a high degree of homogeneity within founding teams, tensions between journalistic and economic practices, insufficient user orientation, as well as a tendency for organizations to be underfinanced. The patterns of failure investigated in this study can raise awareness, help news start-ups avoid common mistakes before actually entering the market, and help industry experts and investors to realistically estimate the potential of new ventures within the digital news industry.}, subject = {Journalismus}, language = {en} } @article{StaubachMachacekSkowroneketal.2020, author = {Staubach, Patrick and Machacek, Jan and Skowronek, Josefine and Wichtmann, Torsten}, title = {Vibratory pile driving in water-saturated sand: Back-analysis of model tests using a hydro-mechanically coupled CEL method}, series = {Soils and Foundations}, volume = {2021}, journal = {Soils and Foundations}, number = {Volume 61, Issue 1}, publisher = {Elsevier, Science Direct}, address = {Amsterdam}, doi = {10.1016/j.sandf.2020.11.005}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20210203-43571}, pages = {144 -- 159}, year = {2020}, abstract = {The development of a hydro-mechanically coupled Coupled-Eulerian-Lagrangian (CEL) method and its application to the back-analysisof vibratory pile driving model tests in water-saturated sand is presented. The predicted pile penetration using this approachis in good agreement with the results of the model tests as well as with fully Lagrangian simulations. In terms of pore water pressure, however, the results of the CEL simulation show a slightly worse accordance with the model tests compared to the Lagrangian simulation. Some shortcomings of the hydro-mechanically coupled CEL method in case of frictional contact problems and pore fluids with high bulk modulus are discussed. Lastly, the CEL method is applied to the simulation of vibratory driving of open-profile piles under partially drained conditions to study installation-induced changes in the soil state. It is concluded that the proposed method is capable of realistically reproducing the most important mechanisms in the soil during the driving process despite its addressed shortcomings.}, subject = {Plastische Deformation}, language = {en} } @article{WolfLondong, author = {Wolf, Mario and Londong, J{\"o}rg}, title = {Transformation der Siedlungswasserwirtschaft - Steuerungsmechanismen im Diskurs ressourcenorientierter Systemans{\"a}tze am Beispiel von Th{\"u}ringen}, series = {Raumforschung und Raumordnung}, volume = {2020}, journal = {Raumforschung und Raumordnung}, number = {Band 78, Heft 4}, publisher = {Sciendo}, doi = {10.2478/rara-2020-0012}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20201022-42731}, pages = {397 -- 411}, abstract = {Neuartige Sanit{\"a}rsysteme zielen auf eine ressourcenorientierte Verwertung von Abwasser ab. Erreicht werden soll dies durch die separate Erfassung von Abwasserteilstr{\"o}men. In den Fach{\"o}ffentlichkeiten der Wasserwirtschaft und Raumplanung werden neuartige Sanit{\"a}rsysteme als ein geeigneter Ansatz f{\"u}r die zuk{\"u}nftige Sicherung der Abwasserentsorgung in l{\"a}ndlichen R{\"a}umen betrachtet. Die Praxistauglichkeit dieser Systeme wurde zwar in Forschungsprojekten nachgewiesen, bisher erschweren jedoch f{\"u}r Abwasserentsorger vielf{\"a}ltige Risiken die Einf{\"u}hrung einer ressourcenorientierten Abwasserbewirtschaftung. Ausgehend von einer Untersuchung der Kontexte bei der Umsetzung eines neuartigen Sanit{\"a}rsystems im l{\"a}ndlichen Raum Th{\"u}ringens wird in diesem Beitrag der Frage nachgegangen, wie auf Landesebene mit dem abwasserwirtschaftlichen Instrumentarium die Einf{\"u}hrung von ressourcenorientierten Systemans{\"a}tzen unterst{\"u}tzt werden kann. Zentrale Elemente des Beitrags sind die Darstellung der wesentlichen Transformationsrisiken in Bezug auf die Einf{\"u}hrung innovativer L{\"o}sungsans{\"a}tze, eine Erl{\"a}uterung der spezifischen abwasserwirtschaftlichen Instrumente sowie die Darlegung von Steuerungsans{\"a}tzen,mit denen die Einf{\"u}hrung von neuartigen Sanit{\"a}rsystemen gef{\"o}rdert werden kann. Im Ergebnis wird die Realisierbarkeit von neuartigen Sanit{\"a}rsystemen durch den strategischen Einsatz des Instrumentariums deutlich, gleichwohl die Wasserwirtschaft durch die Erweiterung der bisherigen Systemgrenzen auf die Kooperation mit anderen Bereichen der Daseinsvorsorge angewiesen ist.}, subject = {Raumordnung}, language = {de} } @article{IşıkBueyueksaracLeventEkincietal., author = {I{\c{s}}{\i}k, Ercan and B{\"u}y{\"u}ksara{\c{c}}, Ayd{\i}n and Levent Ekinci, Yunus and Ayd{\i}n, Mehmet Cihan and Harirchian, Ehsan}, title = {The Effect of Site-Specific Design Spectrum on Earthquake-Building Parameters: A Case Study from the Marmara Region (NW Turkey)}, series = {Applied Sciences}, volume = {2020}, journal = {Applied Sciences}, number = {Volume 10, issue 20, article 7247}, publisher = {MDPI}, address = {Basel}, doi = {10.3390/app10207247}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20201022-42758}, pages = {23}, abstract = {The Marmara Region (NW Turkey) has experienced significant earthquakes (M > 7.0) to date. A destructive earthquake is also expected in the region. To determine the effect of the specific design spectrum, eleven provinces located in the region were chosen according to the Turkey Earthquake Building Code updated in 2019. Additionally, the differences between the previous and updated regulations of the country were investigated. Peak Ground Acceleration (PGA) and Peak Ground Velocity (PGV) were obtained for each province by using earthquake ground motion levels with 2\%, 10\%, 50\%, and 68\% probability of exceedance in 50-year periods. The PGA values in the region range from 0.16 to 0.7 g for earthquakes with a return period of 475 years. For each province, a sample of a reinforced-concrete building having two different numbers of stories with the same ground and structural characteristics was chosen. Static adaptive pushover analyses were performed for the sample reinforced-concrete building using each province's design spectrum. The variations in the earthquake and structural parameters were investigated according to different geographical locations. It was determined that the site-specific design spectrum significantly influences target displacements for performance-based assessments of buildings due to seismicity characteristics of the studied geographic location.}, subject = {Erdbeben}, language = {en} } @article{OuaerHosseiniAmaretal., author = {Ouaer, Hocine and Hosseini, Amir Hossein and Amar, Menad Nait and Ben Seghier, Mohamed El Amine and Ghriga, Mohammed Abdelfetah and Nabipour, Narjes and Andersen, P{\aa}l {\O}steb{\o} and Mosavi, Amir and Shamshirband, Shahaboddin}, title = {Rigorous Connectionist Models to Predict Carbon Dioxide Solubility in Various Ionic Liquids}, series = {Applied Sciences}, volume = {2020}, journal = {Applied Sciences}, number = {Volume 10, Issue 1, 304}, publisher = {MDPI}, doi = {https://doi.org/10.3390/app10010304}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20200107-40558}, pages = {18}, abstract = {Estimating the solubility of carbon dioxide in ionic liquids, using reliable models, is of paramount importance from both environmental and economic points of view. In this regard, the current research aims at evaluating the performance of two data-driven techniques, namely multilayer perceptron (MLP) and gene expression programming (GEP), for predicting the solubility of carbon dioxide (CO2) in ionic liquids (ILs) as the function of pressure, temperature, and four thermodynamical parameters of the ionic liquid. To develop the above techniques, 744 experimental data points derived from the literature including 13 ILs were used (80\% of the points for training and 20\% for validation). Two backpropagation-based methods, namely Levenberg-Marquardt (LM) and Bayesian Regularization (BR), were applied to optimize the MLP algorithm. Various statistical and graphical assessments were applied to check the credibility of the developed techniques. The results were then compared with those calculated using Peng-Robinson (PR) or Soave-Redlich-Kwong (SRK) equations of state (EoS). The highest coefficient of determination (R2 = 0.9965) and the lowest root mean square error (RMSE = 0.0116) were recorded for the MLP-LMA model on the full dataset (with a negligible difference to the MLP-BR model). The comparison of results from this model with the vastly applied thermodynamic equation of state models revealed slightly better performance, but the EoS approaches also performed well with R2 from 0.984 up to 0.996. Lastly, the newly established correlation based on the GEP model exhibited very satisfactory results with overall values of R2 = 0.9896 and RMSE = 0.0201.}, subject = {Maschinelles Lernen}, language = {en} } @article{ShamshirbandBabanezhadMosavietal., author = {Shamshirband, Shahaboddin and Babanezhad, Meisam and Mosavi, Amir and Nabipour, Narjes and Hajnal, Eva and Nadai, Laszlo and Chau, Kwok-Wing}, title = {Prediction of flow characteristics in the bubble column reactor by the artificial pheromone-based communication of biological ants}, series = {Engineering Applications of Computational Fluid Mechanics}, volume = {2020}, journal = {Engineering Applications of Computational Fluid Mechanics}, number = {volume 14, issue 1}, publisher = {Taylor \& Francis}, doi = {10.1080/19942060.2020.1715842}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20200227-41013}, pages = {367 -- 378}, abstract = {A novel combination of the ant colony optimization algorithm (ACO)and computational fluid dynamics (CFD) data is proposed for modeling the multiphase chemical reactors. The proposed intelligent model presents a probabilistic computational strategy for predicting various levels of three-dimensional bubble column reactor (BCR) flow. The results prove an enhanced communication between ant colony prediction and CFD data in different sections of the BCR.}, subject = {Maschinelles Lernen}, language = {en} } @book{OPUS4-4106, title = {Postwachstumsstadt. Konturen einer solidarischen Stadtpolitik}, editor = {Brokow-Loga, Anton and Eckardt, Frank}, publisher = {oekom verlag}, address = {M{\"u}nchen}, isbn = {978-3-96238-696-2}, doi = {10.14512/9783962386962}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20200311-41061}, publisher = {Bauhaus-Universit{\"a}t Weimar}, pages = {344}, abstract = {St{\"a}dte ohne Wachstum - eine bislang kaum vorstellbare Vision. Doch Klimawandel, Ressourcenverschwendung, wachsende soziale Ungleichheiten und viele andere Zukunftsgefahren stellen das bisherige Allheilmittel Wachstum grunds{\"a}tzlich infrage. Wie wollen wir heute und morgen zusammenleben? Wie gestalten wir ein gutes Leben f{\"u}r alle in der Stadt? W{\"a}hrend in einzelnen Nischen diese Fragen bereits ansatzweise beantwortet werden, fehlt es noch immer an umfassenden Entw{\"u}rfen und Transformationsans{\"a}tzen, die eine fundamental andere, solidarische Stadt konturieren. Diesen Versuch wagt das Projekt Postwachstumsstadt. In diesem Buch werden konzeptionelle und pragmatische Aspekte aus verschiedenen Bereichen der Stadtpolitik zusammengebracht, die neue Pfade aufzeigen und verkn{\"u}pfen. Die Beitr{\"a}ge diskutieren st{\"a}dtische Wachstumskrisen, transformative Planung und Konflikte um Gestaltungsmacht. Nicht zuletzt wird dabei auch die Frage nach der Rolle von Stadtutopien neu gestellt. Dadurch soll eine l{\"a}ngst f{\"a}llige Debatte dar{\"u}ber angestoßen werden, wie sich notwendige st{\"a}dtische Wenden durch eine sozial{\"o}kologische Neuorientierung vor Ort verwirklichen lassen.}, subject = {Architektur}, language = {de} } @article{BandJanizadehChandraPaletal., author = {Band, Shahab S. and Janizadeh, Saeid and Chandra Pal, Subodh and Saha, Asish and Chakrabortty, Rabbin and Shokri, Manouchehr and Mosavi, Amir Hosein}, title = {Novel Ensemble Approach of Deep Learning Neural Network (DLNN) Model and Particle Swarm Optimization (PSO) Algorithm for Prediction of Gully Erosion Susceptibility}, series = {Sensors}, volume = {2020}, journal = {Sensors}, number = {Volume 20, issue 19, article 5609}, publisher = {MDPI}, address = {Basel}, doi = {10.3390/s20195609}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20210122-43341}, pages = {1 -- 27}, abstract = {This study aims to evaluate a new approach in modeling gully erosion susceptibility (GES) based on a deep learning neural network (DLNN) model and an ensemble particle swarm optimization (PSO) algorithm with DLNN (PSO-DLNN), comparing these approaches with common artificial neural network (ANN) and support vector machine (SVM) models in Shirahan watershed, Iran. For this purpose, 13 independent variables affecting GES in the study area, namely, altitude, slope, aspect, plan curvature, profile curvature, drainage density, distance from a river, land use, soil, lithology, rainfall, stream power index (SPI), and topographic wetness index (TWI), were prepared. A total of 132 gully erosion locations were identified during field visits. To implement the proposed model, the dataset was divided into the two categories of training (70\%) and testing (30\%). The results indicate that the area under the curve (AUC) value from receiver operating characteristic (ROC) considering the testing datasets of PSO-DLNN is 0.89, which indicates superb accuracy. The rest of the models are associated with optimal accuracy and have similar results to the PSO-DLNN model; the AUC values from ROC of DLNN, SVM, and ANN for the testing datasets are 0.87, 0.85, and 0.84, respectively. The efficiency of the proposed model in terms of prediction of GES was increased. Therefore, it can be concluded that the DLNN model and its ensemble with the PSO algorithm can be used as a novel and practical method to predict gully erosion susceptibility, which can help planners and managers to manage and reduce the risk of this phenomenon.}, subject = {Geoinformatik}, language = {en} } @article{MosaviShokriMansoretal., author = {Mosavi, Amir Hosein and Shokri, Manouchehr and Mansor, Zulkefli and Qasem, Sultan Noman and Band, Shahab S. and Mohammadzadeh, Ardashir}, title = {Machine Learning for Modeling the Singular Multi-Pantograph Equations}, series = {Entropy}, volume = {2020}, journal = {Entropy}, number = {volume 22, issue 9, article 1041}, publisher = {MDPI}, address = {Basel}, doi = {10.3390/e22091041}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20210122-43436}, pages = {1 -- 18}, abstract = {In this study, a new approach to basis of intelligent systems and machine learning algorithms is introduced for solving singular multi-pantograph differential equations (SMDEs). For the first time, a type-2 fuzzy logic based approach is formulated to find an approximated solution. The rules of the suggested type-2 fuzzy logic system (T2-FLS) are optimized by the square root cubature Kalman filter (SCKF) such that the proposed fineness function to be minimized. Furthermore, the stability and boundedness of the estimation error is proved by novel approach on basis of Lyapunov theorem. The accuracy and robustness of the suggested algorithm is verified by several statistical examinations. It is shown that the suggested method results in an accurate solution with rapid convergence and a lower computational cost.}, subject = {Fuzzy-Regelung}, language = {en} } @article{LandauToland, author = {Landau, Friederike and Toland, Alexandra}, title = {Luft sehen, sprechen, sch{\"u}tzen. Das Anthropoz{\"a}n der (post-)politischen Stadt}, series = {s u b \ u r b a n . zeitschrift f{\"u}r kritische stadtforschung}, volume = {2020}, journal = {s u b \ u r b a n . zeitschrift f{\"u}r kritische stadtforschung}, number = {Band 8, Heft 1/2}, publisher = {Sub\urban e.V.}, address = {Leipzig}, doi = {10.36900/suburban.v8i1/2.579}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20210122-43305}, pages = {117 -- 136}, abstract = {Der Beitrag verbindet die Diskussion um die postpolitische Stadt mit der zunehmenden wissenschaftlichen und aktivistischen Auseinandersetzung mit dem Anthropoz{\"a}n, ein Konzept, das die {\"o}kologischen und sozialpolitischen Implikationen menschlichen Handelns auf die Erdoberfl{\"a}che beschreibt. Anhand von drei ausgew{\"a}hlten Fallstudien erkunden wir, wie die spezifisch anthropogene, also menschengemachte, Krise urbaner Luftverschmutzung in k{\"u}nstlerischen Positionen problematisiert wird. Im Kontext des potenziellen Vormarschs von Postpolitik besprechen wir, wie der ambivalente Diskurs des Anthropoz{\"a}ns einerseits Depolitisierung beg{\"u}nstigt und andererseits neue M{\"o}glichkeiten f{\"u}r die Repolitisierung globaler Umweltherausforderungen erm{\"o}glicht.}, subject = {Anthropoz{\"a}n}, language = {de} } @article{HarirchianLahmer, author = {Harirchian, Ehsan and Lahmer, Tom}, title = {Improved Rapid Visual Earthquake Hazard Safety Evaluation of Existing Buildings Using a Type-2 Fuzzy Logic Model}, series = {Applied Sciences}, volume = {2020}, journal = {Applied Sciences}, number = {Volume 10, Issue 3, 2375}, publisher = {MDPI}, address = {Basel}, doi = {10.3390/app10072375}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20200331-41161}, pages = {14}, abstract = {Rapid Visual Screening (RVS) is a procedure that estimates structural scores for buildings and prioritizes their retrofit and upgrade requirements. Despite the speed and simplicity of RVS, many of the collected parameters are non-commensurable and include subjectivity due to visual observations. This might cause uncertainties in the evaluation, which emphasizes the use of a fuzzy-based method. This study aims to propose a novel RVS methodology based on the interval type-2 fuzzy logic system (IT2FLS) to set the priority of vulnerable building to undergo detailed assessment while covering uncertainties and minimizing their effects during evaluation. The proposed method estimates the vulnerability of a building, in terms of Damage Index, considering the number of stories, age of building, plan irregularity, vertical irregularity, building quality, and peak ground velocity, as inputs with a single output variable. Applicability of the proposed method has been investigated using a post-earthquake damage database of reinforced concrete buildings from the Bing{\"o}l and D{\"u}zce earthquakes in Turkey.}, subject = {Fuzzy-Logik}, language = {en} } @article{SaqlaiGhaniKhanetal., author = {Saqlai, Syed Muhammad and Ghani, Anwar and Khan, Imran and Ahmed Khan Ghayyur, Shahbaz and Shamshirband, Shahaboddin and Nabipour, Narjes and Shokri, Manouchehr}, title = {Image Analysis Using Human Body Geometry and Size Proportion Science for Action Classification}, series = {Applied Sciences}, volume = {2020}, journal = {Applied Sciences}, number = {volume 10, issue 16, article 5453}, publisher = {MDPI}, address = {Basel}, doi = {10.3390/app10165453}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20200904-42322}, pages = {24}, abstract = {Gestures are one of the basic modes of human communication and are usually used to represent different actions. Automatic recognition of these actions forms the basis for solving more complex problems like human behavior analysis, video surveillance, event detection, and sign language recognition, etc. Action recognition from images is a challenging task as the key information like temporal data, object trajectory, and optical flow are not available in still images. While measuring the size of different regions of the human body i.e., step size, arms span, length of the arm, forearm, and hand, etc., provides valuable clues for identification of the human actions. In this article, a framework for classification of the human actions is presented where humans are detected and localized through faster region-convolutional neural networks followed by morphological image processing techniques. Furthermore, geometric features from human blob are extracted and incorporated into the classification rules for the six human actions i.e., standing, walking, single-hand side wave, single-hand top wave, both hands side wave, and both hands top wave. The performance of the proposed technique has been evaluated using precision, recall, omission error, and commission error. The proposed technique has been comparatively analyzed in terms of overall accuracy with existing approaches showing that it performs well in contrast to its counterparts.}, subject = {Bildanalyse}, language = {en} } @article{MosaviQasemShokrietal., author = {Mosavi, Amir Hosein and Qasem, Sultan Noman and Shokri, Manouchehr and Band, Shahab S. and Mohammadzadeh, Ardashir}, title = {Fractional-Order Fuzzy Control Approach for Photovoltaic/Battery Systems under Unknown Dynamics, Variable Irradiation and Temperature}, series = {Electronics}, volume = {2020}, journal = {Electronics}, number = {Volume 9, issue 9, article 1455}, publisher = {MDPI}, address = {Basel}, doi = {10.3390/electronics9091455}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20210122-43381}, pages = {1 -- 19}, abstract = {For this paper, the problem of energy/voltage management in photovoltaic (PV)/battery systems was studied, and a new fractional-order control system on basis of type-3 (T3) fuzzy logic systems (FLSs) was developed. New fractional-order learning rules are derived for tuning of T3-FLSs such that the stability is ensured. In addition, using fractional-order calculus, the robustness was studied versus dynamic uncertainties, perturbation of irradiation, and temperature and abruptly faults in output loads, and, subsequently, new compensators were proposed. In several examinations under difficult operation conditions, such as random temperature, variable irradiation, and abrupt changes in output load, the capability of the schemed controller was verified. In addition, in comparison with other methods, such as proportional-derivative-integral (PID), sliding mode controller (SMC), passivity-based control systems (PBC), and linear quadratic regulator (LQR), the superiority of the suggested method was demonstrated.}, subject = {Fuzzy-Logik}, language = {en} } @article{PartschefeldWiegandBellmannetal., author = {Partschefeld, Stephan and Wiegand, Torben and Bellmann, Frank and Osburg, Andrea}, title = {Formation of Geopolymers Using Sodium Silicate Solution and Aluminum Orthophosphate}, series = {Materials}, volume = {2020}, journal = {Materials}, number = {Volume 13, issue 18, article 4202}, publisher = {MDPI}, address = {Basel}, doi = {10.3390/ma13184202}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20210122-43378}, pages = {1 -- 16}, abstract = {This paper reports the formation and structure of fast setting geopolymers activated by using three sodium silicate solutions with different modules (1.6, 2.0 and 2.4) and a berlinite-type aluminum orthophosphate. By varying the concentration of the aluminum orthophosphate, different Si/Al-ratios were established (6, 3 and 2). Reaction kinetics of binders were determined by isothermal calorimetric measurements at 20 °C. X-ray diffraction analysis as well as nuclear magnetic resonance (NMR) measurements were performed on binders to determine differences in structure by varying the alkalinity of the sodium silicate solutions and the Si/Al-ratio. The calorimetric results indicated that the higher the alkalinity of the sodium silicate solution, the higher the solubility and degree of conversion of the aluminum orthophosphate. The results of X-ray diffraction and Rietveldt analysis, as well as the NMR measurements, confirmed the assumption of the calorimetric experiments that first the aluminum orthophosphate was dissolved and then a polycondensation to an amorphous aluminosilicate network occurred. The different amounts of amorphous phases formed as a function of the alkalinity of the sodium silicate solution, indicate that tetrahydroxoaluminate species were formed during the dissolution of the aluminum orthophosphate, which reduce the pH value. This led to no further dissolution of the aluminum orthophosphate, which remained unreacted.}, subject = {Geopolymere}, language = {en} } @article{AhmadiBaghbanSadeghzadehetal., author = {Ahmadi, Mohammad Hossein and Baghban, Alireza and Sadeghzadeh, Milad and Zamen, Mohammad and Mosavi, Amir and Shamshirband, Shahaboddin and Kumar, Ravinder and Mohammadi-Khanaposhtani, Mohammad}, title = {Evaluation of electrical efficiency of photovoltaic thermal solar collector}, series = {Engineering Applications of Computational Fluid Mechanics}, volume = {2020}, journal = {Engineering Applications of Computational Fluid Mechanics}, number = {volume 14, issue 1}, publisher = {Taylor \& Francis}, doi = {10.1080/19942060.2020.1734094}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20200304-41049}, pages = {545 -- 565}, abstract = {In this study, machine learning methods of artificial neural networks (ANNs), least squares support vector machines (LSSVM), and neuro-fuzzy are used for advancing prediction models for thermal performance of a photovoltaic-thermal solar collector (PV/T). In the proposed models, the inlet temperature, flow rate, heat, solar radiation, and the sun heat have been considered as the input variables. Data set has been extracted through experimental measurements from a novel solar collector system. Different analyses are performed to examine the credibility of the introduced models and evaluate their performances. The proposed LSSVM model outperformed the ANFIS and ANNs models. LSSVM model is reported suitable when the laboratory measurements are costly and time-consuming, or achieving such values requires sophisticated interpretations.}, subject = {Fotovoltaik}, language = {en} } @article{BandJanizadehSahaetal., author = {Band, Shahab S. and Janizadeh, Saeid and Saha, Sunil and Mukherjee, Kaustuv and Khosrobeigi Bozchaloei, Saeid and Cerd{\`a}, Artemi and Shokri, Manouchehr and Mosavi, Amir Hosein}, title = {Evaluating the Efficiency of Different Regression, Decision Tree, and Bayesian Machine Learning Algorithms in Spatial Piping Erosion Susceptibility Using ALOS/PALSAR Data}, series = {Land}, volume = {2020}, journal = {Land}, number = {volume 9, issue 10, article 346}, publisher = {MDPI}, address = {Basel}, doi = {10.3390/land9100346}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20210122-43424}, pages = {1 -- 22}, abstract = {Piping erosion is one form of water erosion that leads to significant changes in the landscape and environmental degradation. In the present study, we evaluated piping erosion modeling in the Zarandieh watershed of Markazi province in Iran based on random forest (RF), support vector machine (SVM), and Bayesian generalized linear models (Bayesian GLM) machine learning algorithms. For this goal, due to the importance of various geo-environmental and soil properties in the evolution and creation of piping erosion, 18 variables were considered for modeling the piping erosion susceptibility in the Zarandieh watershed. A total of 152 points of piping erosion were recognized in the study area that were divided into training (70\%) and validation (30\%) for modeling. The area under curve (AUC) was used to assess the effeciency of the RF, SVM, and Bayesian GLM. Piping erosion susceptibility results indicated that all three RF, SVM, and Bayesian GLM models had high efficiency in the testing step, such as the AUC shown with values of 0.9 for RF, 0.88 for SVM, and 0.87 for Bayesian GLM. Altitude, pH, and bulk density were the variables that had the greatest influence on the piping erosion susceptibility in the Zarandieh watershed. This result indicates that geo-environmental and soil chemical variables are accountable for the expansion of piping erosion in the Zarandieh watershed.}, subject = {Maschinelles Lernen}, language = {en} } @article{Schoenig, author = {Sch{\"o}nig, Barbara}, title = {Ererbte Transformation. Kommentar zu Matthias Bernt und Andrej Holm „Die Ostdeutschlandforschung muss das Wohnen in den Blick nehmen"}, series = {s u b \ u r b a n. zeitschrift f{\"u}r kritische stadtforschung}, volume = {2020}, journal = {s u b \ u r b a n. zeitschrift f{\"u}r kritische stadtforschung}, number = {Band 8, Heft 3}, publisher = {Sub\urban e.V.}, address = {Leipzig}, doi = {10.36900/suburban.v8i3.620}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20210122-43296}, pages = {115 -- 122}, abstract = {Matthias Bernt und Andrej Holm weisen zu Recht darauf hin, dass es einer Forschung zu ostdeutschen St{\"a}dten als konzeptionell eigenst{\"a}ndigem Feld bedarf, die die spezifische Verr{\"a}umlichung des tiefgreifenden gesellschaftlichen Transformationsprozesses nach 1990 ins Zentrum stellt. Dabei betrachten sie insbesondere das Feld des Wohnens als produktiv, um Kenntnis {\"u}ber die Struktur und Wirkung dieses Prozesses zu erlangen. Allerdings bleiben sie vage dabei, wie eine solche spezifisch auf Ostdeutschland gerichtete Wohnungsforschung zu konzipieren w{\"a}re und in welcher Weise die Besonderheiten und Parallelit{\"a}ten ostdeutscher Entwicklungen zu den Transformationen von Wohnungs- und Stadtentwicklungspolitik in Westdeutschland, aber auch international, in Bezug zu setzen w{\"a}ren.}, subject = {Deutschland <{\"O}stliche L{\"a}nder>}, language = {de} } @article{AmirinasabShamshirbandChronopoulosetal., author = {Amirinasab, Mehdi and Shamshirband, Shahaboddin and Chronopoulos, Anthony Theodore and Mosavi, Amir and Nabipour, Narjes}, title = {Energy-Efficient Method for Wireless Sensor Networks Low-Power Radio Operation in Internet of Things}, series = {electronics}, volume = {2020}, journal = {electronics}, number = {volume 9, issue 2, 320}, publisher = {MDPI}, doi = {10.3390/electronics9020320}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20200213-40954}, pages = {20}, abstract = {The radio operation in wireless sensor networks (WSN) in Internet of Things (IoT)applications is the most common source for power consumption. Consequently, recognizing and controlling the factors affecting radio operation can be valuable for managing the node power consumption. Among essential factors affecting radio operation, the time spent for checking the radio is of utmost importance for monitoring power consumption. It can lead to false WakeUp or idle listening in radio duty cycles and ContikiMAC. ContikiMAC is a low-power radio duty-cycle protocol in Contiki OS used in WakeUp mode, as a clear channel assessment (CCA) for checking radio status periodically. This paper presents a detailed analysis of radio WakeUp time factors of ContikiMAC. Furthermore, we propose a lightweight CCA (LW-CCA) as an extension to ContikiMAC to reduce the Radio Duty-Cycles in false WakeUps and idle listening though using dynamic received signal strength indicator (RSSI) status check time. The simulation results in the Cooja simulator show that LW-CCA reduces about 8\% energy consumption in nodes while maintaining up to 99\% of the packet delivery rate (PDR).}, subject = {Internet der Dinge}, language = {en} } @article{BrokowLogaNessler, author = {Brokow-Loga, Anton and Neßler, Miriam}, title = {Eine Frage der Fl{\"a}chengerechtigkeit! Kommentar zu Lisa Vollmer und Boris Michel „Wohnen in der Klimakrise. Die Wohnungsfrage als {\"o}kologische Frage"}, series = {s u b \ u r b a n. zeitschrift f{\"u}r kritische stadtforschung}, volume = {2020}, journal = {s u b \ u r b a n. zeitschrift f{\"u}r kritische stadtforschung}, number = {Band 8, Heft 1/2}, publisher = {Sub\urban e.V.}, address = {Leipzig}, doi = {10.36900/suburban.v8i1/2.572}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20210122-43333}, pages = {183 -- 192}, abstract = {Die derzeitige Wohnungskrise hat eine sozial-{\"o}kologische Kernproblematik. Dabei ist die sozial ungerechte und {\"o}kologisch problematische Verteilung von Wohnfl{\"a}che meist unsichtbar und wird weder in wissenschaftlichen noch in aktivistischen Kontexten ausreichend als Frage der Fl{\"a}chengerechtigkeit problematisiert. Denn Wohnraum und Fl{\"a}che in einer Stadt sind keine endlos verf{\"u}gbaren G{\"u}ter: Wenn einige Menschen auf viel Raum leben, bleibt f{\"u}r andere Menschen weniger Fl{\"a}che {\"u}brig. Und die Menschen, die am wenigstens f{\"u}r eine Verknappung von Wohnraum verantwortlich sind, leiden am meisten darunter. Dieser Artikel arbeitet zun{\"a}chst den Begriff der Wohnfl{\"a}chengerechtigkeit heraus, wobei auf die Ungleichverteilung von Wohnfl{\"a}che und deren gesellschaftliche Implikationen unter derzeitigen Wohnungsverteilungsmechanismen Bezug genommen wird. Anschließend wird der Verbrauch von (Wohn-)Fl{\"a}che aus {\"o}kologischer Perspektive problematisiert. Der Artikel diskutiert scheinbare und transformationsorientierte L{\"o}sungs- und Handlungsans{\"a}tze. Abschließend fordert er in der kritischen Stadtforschung und in aktivistischen Kontexten eine st{\"a}rkere Debatte um eine Wohnfl{\"a}chengerechtigkeit, deren Verwirklichung gleichermaßen eine soziale wie {\"o}kologische Dimension hat.}, subject = {Wohnen}, language = {de} }