Search

In order to implement spacecraft assembly based on MBD, this article proposes a method of structural process design based on 3D model. First, an Assembly Digital Mock-up (ADMU) is constructed. Second, we propose the way of assembly process design based on 3D structural process design scheme. Finally, the paper describes the application of the technology, and analyses the effect of the scheme during a satellite development. The technology and systems should be applied on other sophisticated products development, with some essential modifications.

The purpose of this paper is to study the effect of extracted compositions of the de-ash liquefaction residue (D-DCLR) on pyrolysis products yields, compressive strength and composition of the formed-coke, which was prepared by co-pyrolysis of the low metamorphic pulverized coal and D-DCLR. The scanning electron microscope (SEM) and the Fourier Transform Infrared (FT-IR) were used to characterize the morphology and functional group of the formed-coke, respectively. The results showed that the extracted compositions of D-DCLR were heavy oil (HS), asphaltene (A), pre-asphaltene (PA) and tetrahydrofuran isolusion (THFIS), whose contents were 5.10%, 40.90%, 14.4%, 39.60%, respectively. During the pyrolysis process, HS was the main source of tar, and HS, A as well as PA were conducive to improve gas yields. The THFIS helped to improve the yield of the formed-coke up to 89.5%, corresponding to the compressive strength was only 147.7N/ball for the coke. A and PA were the key factors affecting the compressive strength and surface structure of the formed-coke. The compressive strength of coke could be up to 728.0N/ball with adding D-DCLR, which reduced by 50% after the removal of A and PA. The FT-IR analysis showed that the types of surface functional groups of the formed-coke were remained the same after co-pyrolysis, but the absorption peak intensity of each functional group was changed.

In order to implement spacecraft assembly based on MBD, this article proposes a method to construct data-package automatically based on 3D model. First, an Assembly Digital Mock-up (ADMU) is constructed. Second, we propose the way of assembly process design based on 3D structural process design. Third, we construct the product data-package automatically based on the relationship among ADMU, the process files and production parameters Finally, the paper describes the application of the technology, and analyses the effect of the scheme during a satellite development. The technology and systems should be applied on other sophisticated products development, with some essential modifications.

Although quarantine is an effective measure for containing the spread of COVID-19 and reducing the number of infected individuals, it has had negative consequences on the emotional well-being and academic performance of university students. To explore the influence mechanism of school quarantine time on academic procrastination among students, a survey research methodology was employed to assess quarantine time, negative affect, ego depletion, and academic procrastination among 538 Chinese university students, and the Statistical Package for the Social Sciences software suite was used to analyze the collected data. The results indicated that (1) there were significant positive correlations between school quarantine time and academic procrastination, (2) school quarantine time had no direct effect on academic procrastination, but it positively predicted negative affect and ego depletion, and (3) school quarantine time affected the levels of academic procrastination among university students through three indirect paths: the mediating role of negative affect, the mediating role of ego depletion, and the chain mediating role of both negative affect and ego depletion. This cross-sectional study concludes that negative affect and ego depletion could mediate the association between school quarantine time and academic procrastination among university students during the COVID-19 pandemic.

Author(s): Tiantian Dong [sup.1] , Wei Tong [sup.1] , Wen He [sup.1] Author Affiliations: (1) https://ror.org/01cxqmw89, grid.412531.0, 0000 0001 0701 1077, Department of Psychology, Shanghai Normal University, , Guilin Road [...], Scholarly evidence on how meta-stereotype threat affects working memory is still lacking. Therefore, this study conducted two experiments to investigate whether negative meta-stereotypes decreased working memory, focusing on the mediating role of emotion and the moderating role of core self-evaluations. Experiment 1 showed that activated negative meta-stereotypes could lead to lower positive emotions, higher negative emotions, and poorer working memory performance. In this context, negative meta-stereotypes affected working memory through reduced positive emotions. Experiment 2 confirmed the results of Experiment 1, showing that the adverse effects of meta-stereotype threat had more substantial effects on working memory in participants with high core self-evaluations. In contrast, such effects were weak in participants with low core self-evaluations. These findings expand on existing literature concerning how meta-stereotype threat affects working memory, mainly by providing new insights into the processes and conditions of the meta-stereotypes threat effect.