Quantum heat transport in a spin-boson system under nonequilibrium steady state (NESS) is investigated by the nonequilibrium Green's function (NEGF) method. Spin-spin correlators are calculated via the Majorana fermion representation of spin operators, which allows us to make use of Wick's theorem through standard diagrammatic techniques. An analytic formula of heat current is obtained, and numerical results are presented in comparison with those obtained by other methods. Two types of transport mechanisms are identified in high-and low-temperature regions, respectively, which shows a transition from incoherent to coherent transport process with the baths' temperatures decreased. Additionally, a saturation of the heat current is confirmed when increasing the coupling strength between the baths and the intermediate system, which is a sign of quantum Zeno effect (QZE) in the transport process.

No abstract

. Psychological resilience and the onset of activity of daily living disability among older adults in china: a nationwide longitudinal analysis. Journals of Gerontology, Series B: Psychological Sciences and Social Sciences, 70(3), 470-480, doi:10.1093 Objectives. This study explores the influence of psychological resilience on the onset of activities of daily living (ADL) disability among Chinese older adults and examines whether this association varies by age.Method. Using a sample of 11,112 older adults from 2 waves of the Chinese Longitudinal Healthy Longevity Survey, collected in 2002 and 2005, this study examines whether higher levels of psychological resilience (measured by a 5-item scale) predict lower risk of ADL incidence during a 3-year follow-up and whether this effect varies by age.Results. Higher levels of resilience at the baseline are significantly associated with reduced risk of becoming ADL disabled during the 3-year follow-up period, independent of baseline sociodemographic characteristics, family support, and health. Moreover, resilience by age interaction is detected. Higher levels of resilience are more protective against the onset of disability for the younger old (aged 65-84) than the oldest old (aged 85 and older).Discussion. Among older adults in China, psychological resilience is a protective factor against ADL disability, and the benefits are particularly significant for older adults younger than 85 years.

No abstract

No abstract

Since January 2020, the outbreak of the novel coronavirus disease designated covid-19 by the World Health Organization, a human-to-human contagious viral pneumonia that began in 2019, has been extensively influencing daily life in China[...]

No abstract

No abstract