TY - JOUR A1 - Suhr, Maike T1 - Diversität und (Anti-)Diskriminierung im Kontext journalistischer Neugründungen: Eine Forschungsagenda JF - Global Media Journal German Edition N2 - Obgleich redaktionelle Diversität regelmäßig als eine der Kernherausforderungen für den Journalismus gehandelt wird, tun sich journalistische Organisationen immer noch schwer damit, gleichberechtigte Zugangs-und Entfaltungschancen für Frauen, People of Color, Menschen aus Einwandererfamilien oder auf anderen Ebenen diskriminierungsbetroffene Journalist*innen zu schaffen. Stattdessen zeigt die gender-und diversitätsbezogene Redaktionsforschung, dass Redaktionen nach wie vor in ihren Strukturen, Praktiken und in ihrer Kultur gesellschaftliche Machtverhältnisse widerspiegeln und (re-)produzieren. Doch im Zuge des „Entrepreneurial Journalism“ entstehen heute vielerorts neue Organisationen. Diese journalistischen Neugründungen zeichnen sich unter anderem durch kleinere, offenere und flexiblere Organisationsstrukturen aus. Ihr veränderter organisationaler Charakter wurde jedoch bislang noch nicht tiefergehend im Hinblick auf seine Potenziale und möglichen Risiken für Diversität und (Anti-)Diskriminierung untersucht. Der Beitrag hat somit zum Ziel, journalistische Neugründungen als neuen Gegenstand auf der Agenda der organisations-und diskriminierungsbezogenen Journalismusforschung zu positionieren. Dazu werden ausgewählte Studien zum „Entrepreneurial Journalism“ im Hinblick auf Diversität und (Anti-)Diskriminierung aufgearbeitet und bestehende Desiderata identifiziert. Auf dieser Grundlage wird schließlich eine programmatische Forschungsagenda entwickelt, um empirische Folgeforschung zum Thema anzustoßen. KW - Journalismus KW - Entrepreneurship KW - Vielfalt KW - Diskrimierung KW - Redaktion KW - Neugründung KW - Antidiskriminierung Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20231027-64836 UR - https://globalmediajournal.de/index.php/gmj/article/view/265 VL - 2023 IS - Volume 13, No 1 SP - 1 EP - 19 ER - TY - JOUR A1 - Partschefeld, Stephan A1 - Tutal, Adrian A1 - Halmanseder, Thomas A1 - Schneider, Jens A1 - Osburg, Andrea T1 - Investigations on Stability of Polycarboxylate Superplasticizers in Alkaline Activators for Geopolymer Binders JF - Materials N2 - Calcined clays are interesting starting materials to be used as SCMs (supplementary cementitious materials) in cements or to be converted to geopolymers by activation with a high alkaline activator. The adjustment of the properties in the fresh state, especially regarding the consistency of these binders, is almost exclusively achieved by the addition of water, since commercially available superplasticizers seem to be ineffective in low-calcium geopolymer systems. The aim of this study was a systematic investigation of various PCE (polycarboxylate ester/ether) superplasticizers (methacrylate ester PCE: MPEG, isoprenol ether PCE: IPEG, methallyl ether PCE: HPEG) with respect to their stability in different alkaline activators (NaOH, KOH, sodium and potassium silicate solutions). The effectiveness of superplasticizers (SPs) in low-calcium geopolymer binders was verified by rheological tests. Size exclusion chromatography was used to investigate if structural degradation of the superplasticizers occurs. The investigated PCE superplasticizers showed a thickening effect in the low-calcium geopolymer system. Depending on the alkalinity of the activator solution, a degradation process was detected for all the PCEs investigated. The side chains of the PCEs are cleaved off the backbone by basic ester and ether hydrolysis. The highest degree of degradation was found in sodium and potassium silicate solutions. In alkaline hydroxide solutions, the degradation process increases with increasing alkalinity. KW - Geopolymere KW - Verflüssigung KW - metakaoline KW - superplasticizer KW - polycarboxylate ether KW - OA-Publikationsfonds2023 Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20231026-64809 UR - https://www.mdpi.com/1996-1944/16/15/5369 VL - 2023 IS - Volume 16, issue 15, article 5369 SP - 1 EP - 14 PB - MDPI CY - Basel ER - TY - JOUR A1 - Ansari, Meisam A1 - Tartaglione, Fabiola A1 - Könke, Carsten T1 - Experimental Validation of Dynamic Response of Small-Scale Metaconcrete Beams at Resonance Vibration JF - materials N2 - Structures and their components experience substantially large vibration amplitudes at resonance, which can cause their failure. The scope of this study is the utilization of silicone-coated steel balls in concrete as damping aggregates to suppress the resonance vibration. The heavy steel cores oscillate with a frequency close to the resonance frequency of the structure. Due to the phase difference between the vibrations of the cores and the structure, the cores counteract the vibration of the structure. The core-coating inclusions are randomly distributed in concrete similar to standard aggregates. This mixture is referred to as metaconcrete. The main goal of this work is to validate the ability of the inclusions to suppress mechanical vibration through laboratory experiments. For this purpose, two small-scale metaconcrete beams were cast and tested. In a free vibration test, the metaconcrete beams exhibited a larger damping ratio compared to a similar beam cast from conventional concrete. The vibration amplitudes of the metaconcrete beams at resonance were measured with a frequency sweep test. In comparison with the conventional concrete beam, both metaconcrete beams demonstrated smaller vibration amplitudes. Both experiments verified an improvement in the dynamic response of the metaconcrete beams at resonance vibration. KW - Beton KW - metaconcrete KW - Schwingungsdämpfung KW - damping aggregate KW - vibration absorber KW - free vibration test KW - frequency sweep test Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20230818-64154 UR - https://www.mdpi.com/1996-1944/16/14/5029 VL - 2023 IS - volume 16, issue 14, article 5029 SP - 1 EP - 17 PB - MDPI CY - Basel ER - TY - JOUR A1 - Coenen, Ekkehard T1 - Anti-Gewalttrainings, Gewaltwissen und die institutionelle Erzeugung gewaltbefreiter Subjekte JF - Soziale Passagen N2 - Dieser Beitrag fragt danach, wie Wissen über Gewalt in Anti-Gewalttrainings produziert, vermittelt und sozial wirkmächtig wird. Auf Basis des kommunikativen Konstruktivismus werden diese Kurse als gewaltbezogene Institutionen begriffen, in denen eine Wissensordnung der Gewalt stabilisiert wird. Sie sollen Abweichungen von institutionalisierten Wirklichkeitsvorstellungen in Bezug auf Gewalt entgegenwirken. Dabei lassen sie sich als Selbsttechniken begreifen, durch welche die Kursteilnehmer*innen eine spezifische Subjektposition einüben, nämlich die des gewaltbefreiten Subjekts. Vor diesem Hintergrund wird anschließend zwischen konditionalen und konzessiven Anti-Gewalttrainings unterschieden. Erstere wenden sich an Personen, die tatsächlich von der institutionalisierten Wirklichkeitsvorstellung abgewichen sind und somit gesellschaftlich als Gewalttäter*innen eingestuft werden, während Letztere auf eine Klientel zielen, die potenziell von den gängigen Normen abweichen könnte, obwohl noch keine Gewalt aufgetreten sein muss. Abschließend wird gezeigt, dass den Kursleiter*innen eine wichtige Rolle im Subjektivierungsprozess und der Wissenskommunikation über Gewalt zukommt. Neben Wissen über Gewalt werden durch sie auch Wertbindungen, Legitimationen und Weltbilder vermittelt. KW - Gewalt KW - Soziologie KW - Wissenssoziologie KW - Gewaltprävention KW - gewaltbezogene Institution KW - Subjektivierung KW - kommunikativer Konstruktivismus Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20230720-64104 UR - https://link.springer.com/article/10.1007/s12592-023-00453-9 VL - 2023 SP - 1 EP - 16 PB - VS, Verl. für Sozialwissenschaften/GWV-Fachverlag CY - Wiesbaden ER - TY - JOUR A1 - Vogel, Albert A1 - Arnold, Jörg A1 - Voelker, Conrad A1 - Kornadt, Oliver T1 - Data for sound pressure level prediction in lightweight constructions caused by structure-borne sound sources and their uncertainties JF - Data in Brief N2 - When predicting sound pressure levels induced by structure-borne sound sources and describing the sound propagation path through the building structure as exactly as possible, it is necessary to characterize the vibration behavior of the structure-borne sound sources. In this investigation, the characterization of structure-borne sound sources was performed using the two-stage method (TSM) described in EN 15657. Four different structure-borne sound sources were characterized and subsequently installed in a lightweight test stand. The resulting sound pressure levels in an adjacent receiving room were measured. In the second step, sound pressure levels were predicted according to EN 12354-5 based on the parameters of the structure-borne sound sources. Subsequently, the predicted and the measured sound pressure levels were compared to obtain reliable statements on the achievable accuracy when using source quantities determined by TSM with this prediction method. KW - Bauakustik KW - Körperschall KW - building acoustics KW - structure-borne sound KW - sound pressure level prediction KW - structure-borne sound sources KW - OA-Publikationsfonds2023 Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20230719-64114 UR - https://www.sciencedirect.com/science/article/pii/S2352340923004110?via%3Dihub VL - 2023 IS - Volume 48, June 2023, article 109292 SP - 1 EP - 16 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Abdelnour, Mena A1 - Zabel, Volkmar T1 - Modal identification of structures with a dynamic behaviour characterised by global and local modes at close frequencies JF - Acta Mechanica N2 - Identification of modal parameters of a space frame structure is a complex assignment due to a large number of degrees of freedom, close natural frequencies, and different vibrating mechanisms. Research has been carried out on the modal identification of rather simple truss structures. So far, less attention has been given to complex three-dimensional truss structures. This work develops a vibration-based methodology for determining modal information of three-dimensional space truss structures. The method uses a relatively complex space truss structure for its verification. Numerical modelling of the system gives modal information about the expected vibration behaviour. The identification process involves closely spaced modes that are characterised by local and global vibration mechanisms. To distinguish between local and global vibrations of the system, modal strain energies are used as an indicator. The experimental validation, which incorporated a modal analysis employing the stochastic subspace identification method, has confirmed that considering relatively high model orders is required to identify specific mode shapes. Especially in the case of the determination of local deformation modes of space truss members, higher model orders have to be taken into account than in the modal identification of most other types of structures. KW - Fachwerkbau KW - Holzkonstruktion KW - Schwingung KW - three-dimensional truss structures KW - vibration-based methodology KW - numerical modelling Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20230525-63822 UR - https://link.springer.com/article/10.1007/s00707-023-03598-z VL - 2023 SP - 1 EP - 21 PB - Springer CY - Wien ER - TY - JOUR A1 - Kreskowski, Adrian A1 - Rendle, Gareth A1 - Fröhlich, Bernd T1 - Efficient Direct Isosurface Rasterization of Scalar Volumes JF - Computer Graphics Forum N2 - In this paper we propose a novel and efficient rasterization-based approach for direct rendering of isosurfaces. Our method exploits the capabilities of task and mesh shader pipelines to identify subvolumes containing potentially visible isosurface geometry, and to efficiently extract primitives which are consumed on the fly by the rasterizer. As a result, our approach requires little preprocessing and negligible additional memory. Direct isosurface rasterization is competitive in terms of rendering performance when compared with ray-marching-based approaches, and significantly outperforms them for increasing resolution in most situations. Since our approach is entirely rasterization based, it affords straightforward integration into existing rendering pipelines, while allowing the use of modern graphics hardware features, such as multi-view stereo for efficient rendering of stereoscopic image pairs for geometry-bound applications. Direct isosurface rasterization is suitable for applications where isosurface geometry is highly variable, such as interactive analysis scenarios for static and dynamic data sets that require frequent isovalue adjustment. KW - Rendering KW - Rastergrafik KW - Visualisierung KW - Maschinelles Sehen KW - isosurface KW - rendering KW - rasterization Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20230525-63835 UR - https://onlinelibrary.wiley.com/doi/full/10.1111/cgf.14670 VL - 2022 IS - Volume 4, Issue 7 SP - 215 EP - 226 PB - Wiley Blackwell CY - Oxford ER - TY - JOUR A1 - Sander, Hendrik A1 - Weißermel, Sören T1 - Urban Heat Transition in Berlin: Corporate Strategies, Political Conflicts, and Just Solutions JF - Urban Planning N2 - In the field of urban climate policy, heat production and demand are key sectors for achieving a sustainable city. Heat production has to shift from fossil to renewable energies, and the heat demand of most buildings has to be reduced significantly via building retrofits. However, analyses of heat transition still lack its contextualization within entangled urban politico-economic processes and materialities and require critical socio-theoretical examination. Asking about the embeddedness of heat transition within social relations and its implications for social justice issues, this article discusses the challenges and opportunities of heat transition, taking Berlin as an example. It uses an urban political ecology perspective to analyze the materialities of Berlin’s heating-housing nexus, its politico-economic context, implications for relations of inequality and power, and its contested strategies. The empirical analysis identifies major disputes about the future trajectory of heat production and about the distribution of retrofit costs. Using our conceptual approach, we discuss these empirical findings against the idea of a more just heat transition. For this purpose, we discuss three policy proposals regarding cost distribution, urban heat planning, and remunicipalization of heat utilities. We argue that this conceptual approach provides huge benefits for debates around heat transition and, more generally, energy justice and just transitions. KW - Berlin KW - Stadtplanung KW - Ökologie KW - energy justice KW - energy retrofitting KW - green gentrification KW - low-carbon policy KW - urban political ecology KW - OA-Publikationsfonds2023 Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20230524-63845 UR - https://www.cogitatiopress.com/urbanplanning/article/view/6178 VL - 2023 IS - Volume 8, No 1 SP - 361 EP - 371 PB - Cogitatio Press CY - Lissabon ER - TY - JOUR A1 - Bockelmann, Leo T1 - Impacts of Change: Analysing the Perception of Industrial Heritage in the Vogtland Region JF - Urban Planning N2 - Beyond metropolitan areas, many peripheral regions and their cities in Europe have, in manifold ways, been significantly shaped by industrialisation. In the context of the relocation of industrial production to other countries over the last decades, the question has been raised as to the role this heritage can play in futural regional development as well as the potential local identification with this history. Hence, this article seeks to analyse the perception of the industrial heritage in the Vogtland region, located alongside the border of three German federal states and the Czech Republic. It inquires as to the perception of the industrial heritage by the local population and related potential future narrations. Based on spontaneous and explorative interviews with local people as an empirical base, a discrepancy between the perception of the tangible and intangible dimensions of the industrial heritage can be observed. On the one hand, the tangible heritage like older factories and production complexes are seen as a functional legacy and an “eyesore” narrative is attributed to them. On the other hand, people often reference the personal and familial connection to the industry and highlight its importance for the historical development and the wealth of the region. But these positive associations are mainly limited to the intangible dimension and are disconnected from the material artefacts of industrial production. KW - Vogtland KW - Technisches Denkmal KW - Regionalentwicklung KW - industrial heritage KW - perception KW - regional development KW - OA-Publikationsfonds2023 Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20230524-63814 UR - https://www.cogitatiopress.com/urbanplanning/article/view/6025 VL - 2023 IS - Volume 8, No 1 SP - 30 EP - 38 PB - Cogitatio Press CY - Lissabon ER - TY - JOUR A1 - Damir, Mirhan A1 - Meyer, Martin A1 - Aziz, Hellen T1 - Patterns of Detachment: Spatial Transformations of the Phosphate Industry in el-Quseir, Egypt JF - Urban Planning N2 - The establishment of phosphate mines and processing plants by Italian entrepreneurs in el-Quseir in 1912 revitalized a town that had faced a steady decline after the opening of the Suez Canal and re-linked it to the world economy. To this day, the now defunct industrial site occupies a large section of physical el-Quseir and plays a key role in its identity. In this article, we explore the impact of the company’s successive industrialization and deindustrialization based on archival research, interviews, and mapping. By tracing physical changes on-site and in the city of el-Quseir from the founding of its phosphate industry until today, as well as the historical and current interactions of citizens with the industrial facilities, we hope to better understand the “cluster value” of the industrial plant in quotidian life and the effect of the vacuum left behind after the termination of production. As machinery and buildings are slowly eroding in the absence of expressed interest by the former Italian and current Egyptian owners, we aim to discuss the relationship between the citizens and their el-Quseir phosphate plant as a crucial element of its heritage value at the local level. KW - Ägypten KW - Industriekultur KW - Italien KW - Bergbau KW - Egypt KW - industrial heritage KW - Italy KW - mining KW - phosphate industry KW - OA-Publikationsfonds2023 Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20230524-63805 UR - https://www.cogitatiopress.com/urbanplanning/article/view/6053 VL - 2023 IS - Volume 8, No 1 SP - 1 EP - 16 PB - Cogitatio Press CY - Lissabon ER -