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Initial Crystallization Effects in Coarse-Grained Polyethylene Systems After Uni- and Biaxial Stretching in Blow-Molding Cooling Scenarios
No full textThis study investigates the initial stage of the thermo-mechanical crystallization behavior for uni- and biaxially stretched polyethylene. The models are based on a mesoscale molecular dynamics approach. We take constraints that occur in real-life polymer processing into account, especially with respect to the blowing stage of the extrusion blow-molding process. For this purpose, we deform our systems using a wide range of stretching levels before they are quenched. We discuss the effects of the stretching procedures on the micro-mechanical state of the systems, characterized by entanglement behavior and nematic ordering of chain segments. For the cooling stage, we use two different approaches which allow for free or hindered shrinkage, respectively. During cooling, crystallization kinetics are monitored: We precisely evaluate how the interplay of chain length, temperature, local entanglements and orientation of chain segments influence crystallization behavior. Our models reveal that the main stretching direction dominates microscopic states of the different systems. We are able to show that crystallization mainly depends on the (dis-)entanglement behavior. Nematic ordering plays a secondary role
A Novel Emergency Gas-to-Power System Based on an Efficient and Long-Lasting Solid-State Hydride Storage System: Modeling and Experimental Validation
No full textIn this paper, a gas-to-power (GtoP) system for power outages is digitally modeled and experimentally developed. The design includes a solid-state hydrogen storage system composed of TiFeMn as a hydride forming alloy (6.7 kg of alloy in five tanks) and an air-cooled fuel cell (maximum power: 1.6 kW). The hydrogen storage system is charged under room temperature and 40 bar of hydrogen pressure, reaching about 110 g of hydrogen capacity. In an emergency use case of the system, hydrogen is supplied to the fuel cell, and the waste heat coming from the exhaust air of the fuel cell is used for the endothermic dehydrogenation reaction of the metal hydride. This GtoP system demonstrates fast, stable, and reliable responses, providing from 149 W to 596 W under different constant as well as dynamic conditions. A comprehensive and novel simulation approach based on a network model is also applied. The developed model is validated under static and dynamic power load scenarios, demonstrating excellent agreement with the experimental results
Artificial Intelligence in Elite Sports-A Narrative Review of Success Stories and Challenges
No full textThis paper explores the role of artificial intelligence (AI) in elite sports. We approach the topic from two perspectives. Firstly, we provide a literature based overview of AI success stories in areas other than sports. We identified multiple approaches in the area of Machine Perception, Machine Learning and Modeling, Planning and Optimization as well as Interaction and Intervention, holding a potential for improving training and competition. Secondly, we discover the present status of AI use in elite sports. Therefore, in addition to another literature review, we interviewed leading sports scientist, which are closely connected to the main national service institute for elite sports in their countries. The analysis of this literature review and the interviews show that the most activity is carried out in the methodical categories of signal and image processing. However, projects in the field of modeling & planning have become increasingly popular within the last years. Based on these two perspectives, we extract deficits, issues and opportunities and summarize them in six key challenges faced by the sports analytics community. These challenges include data collection, controllability of an AI by the practitioners and explainability of AI results
Discarded news: On news enlightenment, agenda cutting, and news ignorance
No full textWhen important news fail to reach their recipients, namely, the politically interested, socially open-minded public, we sometimes refer to this process as agenda cutting. This article presents the key theoretical positions on this under-researched phenomenon, presenting important study results as well as our own empirical findings on internal editorial decision-making processes whereby topics are removed from the agenda. Last, we will critically examine the role of the audience as an actor in agenda cutting, which could be described as »news ignorance«.[1]
The top story showcased by Initiative Nachrichtenaufklärung (INA) e.V. in 2022 was the creeping abolition of free textbooks in German schools. In a public radio broadcast, the head of TV news magazine Tagesthemen and deputy editor-in-chief of ARD-Aktuell, Helge Fuhst, conceded that he considered this topic highly relevant, yet it had indeed not been covered in his TV news program. »Leaving out topics is, in fact, the most difficult challenge,« Fuhst said. »Having to drop topics hurts every day. There are only a few days a year when we have absolutely no idea what to put on the air.« (WDR 2022)
The process of news selection is editorial routine, which includes omitting, discarding, or abandoning topics. When this negative process is intentional, it can also be referred to as agenda cutting. This term from the field of communications science describes a distinct form of editorial routine that has been little studied to date and whose mechanisms, with their considerable influence on the formation of public opinion, are in urgent need of media research scrutiny
Einführung in das bürgerliche Recht für Betriebswirte: Grundzüge des BGB - Systematische Darstellung in Übersichten
No full textMit dem vorliegenden Band 7 „Einführung in das bürgerliche Recht für Betriebswirte“ der Schriftenreihe „Betriebswirtschaftslehre in Übersichten“ werden ihre Themengebiete über die betriebswirtschaftlichen Kernfächer hinaus auf das bürgerliche Recht erweitert: Profunde juristische Kenntnisse bilden eine wesentliche Grundlage für den Studien- und Berufserfolg.
Dieses Buch ist kein Lehrbuch im eigentlichen Sinne. Aus Vorlesungsskripten entstanden, verfolgt es das Ziel, den Studenten der Wirtschaftswissenschaften an Fachhochschulen und Universitäten eine systematische, auf das Wesentliche konzentrierte Lernhilfe zur Vorbereitung auf Prüfungen im Grundstudium anzubieten.
Hierzu wird auf grundlegende Rechtsgebiete der ersten drei Bücher des BGB eingegangen, wobei – im Hinblick auf die Zielgruppe – der Schwerpunkt auf dem Kaufvertrags- bzw. Werkvertragsrecht und den damit verbundenen Rechtsfragen (von den Leistungsstörungen bis zum Eigentumserwerb) liegt. Auch die in der Wirtschaftspraxis wichtigen Verbraucherschutzrechte werden berücksichtigt.
Zur Vereinfachung der für „Nichtjuristen“ oftmals schwierig verständlichen Paragrafen des BGB, werden diese mit anschaulichen Beispielen erörtert. Praxistipps vereinfachen die Umsetzung des Erlernten in den betriebswirtschaftlichen Alltag.
Das Werk entspricht dem Rechtsstand zum 01.06.2022.
(Verlagsangaben
Hören und Nachdenken
No full textLandessozialgericht Berlin-Brandenburg, Urteil vom 10.02.2022 –
L 3 U 148/20 (Revision eingelegt – B 2 U 8/22 R –
Medienkulturwissenschaft: Eine Einführung
No full textDer Band erklärt die Entstehung, Entwicklung und inhaltliche Breite der Medienkulturwissenschaft. Deren Felder werden ebenso demonstriert wie Forschungsfragen entworfen. Ein spezielles Augenmerk liegt auf interdisziplinären Verhältnissen, etwa zur Kommunikations- und Literaturwissenschaft. Zudem wird aus dieser Perspektive die Historie von Einzelmedien vorgestellt und ausgewählte Phänomene mit der medienkulturwissenschaftlichen „Brille“ skizziert. Dadurch kann die Geschichte und Philosophie der Medienkulturwissenschaft ebenso diskutiert werden wie deren Anwendungsfälle sowie ihre Positionen innerhalb eines Medienstudiums mit starkem Praxisbezug, bei dem die Theorien und Ästhetiken der Medien nicht außer Acht gelassen werden. (Verlagsangaben
