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Aufsatz
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Comparison of Real and Simulated Fiber Orientations in Injection Molded Short Glass Fiber Reinforced Polyamide by X-ray Microtomography
(2021-12-22)
During injection molding of short glass fiber reinforced composites, a complex structure is formed due to the fiber movement. The resulting fiber orientation can be predicted using various simulation models. However, the models are known to have inadequacies andthe influence of process and model parameters is not clearly and comprehensively described. In this study, the aforementioned model and process parameters are investigated to determine the dependencies of the individual influences on the real and simulated ...
Aufsatz
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Identification of a Spatio-Temporal Temperature Model for Laser Metal Deposition
(2021-12-18)
Laser-based additive manufacturing enables the production of complex geometries via layer-wise cladding. Laser metal deposition (LMD) uses a scanning laser source to fuse in situ deposited metal powder layer by layer. However, due to the excessive number of influential factors in the physical transformation of the metal powder and the highly dynamic temperature fields caused by the melt pool dynamics and phase transitions, the quality and repeatability of parts built by this process is still challenging. In order to ...
Aufsatz
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Status for the good guys: An experiment on charitable giving
(2021-10-06)
We study the social status motive in an experiment at an art-house cinema in Germany where movie-goers can make monetary contributions to help the cinema become climate neutral. Our key result is that offering high contributors a “social status gift” that displays their good deed increases both the likelihood of a high contribution and mean contributions. It performs significantly better than previously studied mechanisms, such as the removal of anonymity, the provision of a reference point, or a neutral thank-you ...
Aufsatz
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Geheimnisse in der Supervision von Psychotherapeut/innen in Ausbildung und Motive dafür
(2021-06-01)
Geheimnisse sind omnipräsent: 97 % der Menschen haben mindestens ein Geheimnis, von dem niemand weiß. Die allgemeine Geheimnisforschung hat in den letzten Jahren zugenommen, fehlt aber noch im Supervisionsbereich. In einer anonymisierten Online-Befragung von Psychotherapeut/innen in Ausbildung (PiA) zeigte sich: Die häufigsten Geheimnisse in der Supervision sind, dass die Supervision keine Hilfe ist, die PiAs sich nicht ernst genommen fühlen und dass sich die Konzeptionen von PiAs von denen ihrer Supervisor/innen ...
Aufsatz
![Open Access](/themes/Mirage2/images/Open_Access_logo_PLoS_transparent.svg)
Das Potenzial Positiver Psychologie in der Arbeitswelt
(2021-12-21)
Das Wohlbefinden von Mitarbeitenden ist ein entscheidender Einflussfaktor für diverse organisationale Erfolgsgrößen wie Arbeitsleistung oder -zufriedenheit. Dieser Artikel beschäftigt sich mit der Frage, ob und durch welche Wirkmechanismen Interventionen der Positiven Psychologie das Wohlbefinden in Arbeitnehmerstichproben erhöhen und organisationale Ergebnisgrößen beeinflussen können. Die Studienergebnisse unter Einbezug bisheriger Forschung legen nahe, dass Positive Interventionen bei langfristiger Anwendung das ...
Aufsatz
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Improving decision-making through material flow cost accounting: the case of VietGreen bottled mineral water company
(2021-08-04)
VietGreen, headquartered in the South of Vietnam, is a bottled mineral water company striving towards becoming a leading mineral water producer with a strong reputation for social responsibility and integrity. This case describes VietGreen’s decision to explore the potential of material flow cost accounting (MFCA) for enhanced eco-efficiency and achieving the company’s long-term goals. It introduces the students to the company’s major challenges in meeting existing and newly introduced environmental regulations and ...
Aufsatz
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Actuation of an elastic membrane by the use of an electrorheological valve
(2021-01-25)
The dynamic response of a fluidic actuator is investigated on the basis of numerical simulations. With this actuator a membrane is excited to oscillate by means of an electrorheological valve. For this purpose the solid and fluid domains are coupled. Furthermore, the constitutive equation of the fluid is coupled to the electric field. The dynamic response is discussed on the example of a variable stiffness of the membrane. Actuators of this type offer the potential to delay the transition of a boundary layer.
Aufsatz
![Open Access](/themes/Mirage2/images/Open_Access_logo_PLoS_transparent.svg)
Efficient Solution of Distributed MIP in Control of Networked Systems
(2021-01-25)
Certain classes of optimization‐based control problems stated for networked systems involving hybrid dynamics and logical constraints can be cast into Mixed‐Integer Programming (MIP) problems. Since these belong to the complexity class NP‐hard, the motivation arises to find approximations of the optimal solution by distributed solution efficiently. For the cases that the cost functional is linear or quadratic and the constraints are linear, this paper proposes an alternative to the standard centralized schemes, by ...
Aufsatz
![Open Access](/themes/Mirage2/images/Open_Access_logo_PLoS_transparent.svg)
Simultaneous determination of Bingham material parameters using a ball probe concrete rheometer
(2021-01-25)
A new evaluation method allowing direct determination of the Bingham parameters from ball probe rheometers. A non‐linear relationship between the direct measured variables and the material parameters is revealed through numerical parameter studies. The method was validated on two devices of the ball probe type with different dimensions. Comparison with other methods showed good agreement. It is pointed out how the evaluation method can be transferred to devices having other dimensions by performing a limited number ...
Aufsatz
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Damage modelling for the lifetime prediction of structural adhesive joints subjected to hygro‐thermo‐mechanical long‐term loading
(2021-01-25)
A damage model is presented for the lifetime prediction of structural adhesive joints under hygro‐thermo‐mechanical loading. The damage approach is applied through a cohesive zone model together with the concept of effective stress. It consists of a temperature‐dependent creep and hygro damage evolution due to mechanical loading and chemical aging, caused by the local water concentration. The creep damage part considers multiaxiality of the loading by an equivalent stress. The model parameters are identified by means ...