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36 results

Page 1 of 2

  • The mechanisms underlying the negative effect of depression on life satisfaction among the elderly: the roles of ostracism and economic income
  • Lei Shao, Guoliang Yu, Denghao Zhang
  • Journal: International Psychogeriatrics / Volume 34 / Issue 8 / August 2022
  • Published online by Cambridge University Press: 01 October 2021, pp. 715-724
  • View abstract
    Objectives:

    Depression is prevalent among older persons, which seriously threatens their life satisfaction. This study aimed to explore the internal mechanisms by which depression influences life satisfaction among the elderly, as well as the mediating and moderating effects of ostracism and economic income, respectively, in a sample of rural older adults across China.

    Design:

    This was a cross-sectional survey conducted as part of the project “Thousands of People and Hundreds of Villages (2019).”

    Setting:

    Participants were rural older adults from 31 provincial-level administrative units across China.

    Participants:

    The sample composed of 1,754 participants aged 60 years and over.

    Measurements:

    Depression was assessed with the depression subscale of the Depression Anxiety Stress Scales, life satisfaction with the Satisfaction with Life Scale, ostracism with the Ostracism Experience Scale (OES), and economic income and other control variables with related demographic scales. Moderation and mediation analyses were performed using the regression-based approach as conducted by Hayes (2013).

    Results:

    Depression negatively predicted life satisfaction among the elderly. Ostracism played a partially mediating role between depression and life satisfaction. Economic income moderated the effect of depression and ostracism on life satisfaction: High economic income weakened the negative effect of depression on life satisfaction and enhanced the negative effect of ostracism on life satisfaction.

    Conclusion:

    Improving depressed elderly people’s interpersonal relationships and financial support could improve their life satisfaction.

  • A Mathematical Model Including Mechanical Structure, Hydraulic and Control of LHDS
  • Guoliang Ma, Kaixian Ba, Zhiwu Han, Zhengguo Jin, Bin Yu, Xiangdong Kong
  • Journal: Robotica / Volume 39 / Issue 7 / July 2021
  • Published online by Cambridge University Press: 20 January 2021, pp. 1328-1343
  • View abstract

    In this paper, mathematical models of kinematics, statics and inverse dynamics are derived firstly according to the mechanical structure of leg hydraulic drive system (LHDS). Then, all the above models are integrated with MATLAB/Simulink to build the LHDS simulation model, the model not only considers influence of leg dynamic characteristics on hydraulic system but also takes into account nonlinearity, variable load characteristics and other common problems brought by hydraulic system, and solves compatibility and operation time which brought by using multiple software simultaneously. The experimental results show the simulation model built in this paper can accurately express characteristics of the system.

  • 6 - Localisation Algebras and K-homology
  • from Part Two - Roe Algebras, Localisation Algebras and Assembly
  • Rufus Willett, University of Hawaii, Manoa, Guoliang Yu, Texas A & M University
  • Book: Higher Index Theory
  • Published online: 11 June 2020
  • Print publication: 02 July 2020, pp 217-273
  • View extract

    Summary

    Introduction to assembly as a 'forget control' map from K-homology to K-theory of Roe algebras. Introduction of the Baum-Connes and coarse Baum-Connes conjectures as universal assembly maps. Concrete models for the Baum-Connes conjecture for special cases, and proof of the coarse Baum-Connes conjecture for Euclidean space.

  • 5 - Roe Algebras
  • from Part Two - Roe Algebras, Localisation Algebras and Assembly
  • Rufus Willett, University of Hawaii, Manoa, Guoliang Yu, Texas A & M University
  • Book: Higher Index Theory
  • Published online: 11 June 2020
  • Print publication: 02 July 2020, pp 198-216
  • View extract

    Summary

    Introduction of localisation algebras, and use of these to build an analytic model for K-homology, including a proof that this model is a generalised homology theory. Equivariant versions, and relationships to other models of K-homology.

  • 9 - Products and Poincaré Duality
  • from Part Three - Differential Operators
  • Rufus Willett, University of Hawaii, Manoa, Guoliang Yu, Texas A & M University
  • Book: Higher Index Theory
  • Published online: 11 June 2020
  • Print publication: 02 July 2020, pp 353-392
  • View extract

    Summary

    Applications of assembly maps to the Kadison-Kaplansky conjecture on the existence of idempotents in group algebras, to the existence and study of positive scalar curvature metrics, and to the Novikov conjecture in manifold topology. Historical motivation and some overview of the literature.

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