Factors associated with active aging in Chinese elderly in rural areas of Xiangtan County,China

Objectives:To explore the level of active aging and correlates among rural elderly in Xiangtan County,China.Methods:A cross-sectional survey was conducted from July to November 2019.A total of 945 rural elderly from 3 towns in Xiangtan County,China,were investigated by using the positive aging evaluation questionnaire(PAEQ),the activity of daily living scale(ADL),and the depression in old-age scale(DIA-S).Results:The average score in the PAEQ among the rural elderly of Xiangtan County was 72.81(range=21-105).A moderate negative correlation was found between the score in the PAEQ and those in the ADL(r=−0.361)and DIA-S(r=−0.495).Symptoms of depression(β:−0.321,P=0.001),number of chronic diseases(β:−0.281,P=0.001),subjective economic status(β:0.239,P=0.001),ADL(β:−0.196,P=0.001),education(β:0.126,P=0.001),number of children(β:0.097,P=0.001),and marital status(β:−0.060,P=0.001)were significantly associated with levels of active aging in rural elderly,whereas gender and age were not independently related to active aging.Conclusions:The level of active aging is at a moderately high level in the Chinese elderly in rural areas in Xiangtan County.The focus group of active aging in rural areas should be elderly people suffering from chronic diseases,physical decline,poor education and economic conditions,childlessness,and those without partners.

Geology and mineralization of the Tiegelongnan supergiant porphyry-epithermal Cu(Au, Ag) deposit(10 Mt) in western Tibet, China: A review

The Tiegelongnan Cu(Au,Ag)deposit in central Tibet contains more than 10 Mt of copper ranking 29 th in the world.It is characterized by typical porphyry-epithermal alteration and mineralization.In order to improve the understanding of porphyry-epithermal copper deposit in Tibet,new zircon U-Pb age and sulfur isotope data along with published data in the Tiegelongnan are presented to investigate the formation and preservation mechanism.Ore-related intrusive rocks in the Tiegelongnan including Early Cretaceous(about 120 Ma)granodiorite porphyry and diorite porphyry are closely related to the northward subduction of Bangongco-Nujiang ocean.Sulfur mainly comes from deep magma,and ore-forming fluid is affected by both magmatic and meteoric water.The metallogenic setting of Tiegelongnan is consistent with those of Andean porphyry copper deposits in South America.The cover of the Meiriqiecuo Formation volcanic rocks,Lhasa-Qiangtang collision and India-Eurasian collision have significance in the preservation and uplift of the deposit.The formation,preservation and discovery of Tiegelongnan play an important role in exploration of ancient porphyry-epithermal deposits in Tibet.

Surface reconstruction of heterostructures in alkaline medium towards enhanced electrocatalytic hydrogen evolution

Constructing heterostructures has proved to be a successful strategy to fabricate electrocatalysts with high efficiency for water splitting.However,the structure evolution in alkaline hydrogen evolution reaction lacks investigation and the specific active center remains disputable.Herein,we take the well-designed Ni_(3)S_(2)@VO_(2) heterostructures as a model to investigate the electrocatalytic activity and the surface reconstruction process of heterostructure catalysts in alkaline electrolyte.The Ni_(3)S_(2)@VO_(2) heterostructures,with Ni_(3)S_(2) nanorods as the core and VO_(2) nanoflakes as the shell,coupled with the high conductive Ni_(3)S_(2),the hydrophilic VO_(2) and modulated electronic structures at the interfaces,exhibited prominent activity and superior stability at various current densities.Further,the ex-situ characterizations confirmed that the surface reconstruction from Ni_(3)S_(2)@VO_(2) into Ni_(3)S_(2)@amorphous-Ni(OH)_(2) in alkaline media could optimize the water dissociation barrier and exposed large active area,thereby contributing to improved electrocatalytic performance.Our study not only introduces novel high-performance electrocatalysts for hydrogen evolution reaction(HER),but also provides a new avenue for re-examining hetero-structural catalysts in alkaline solutions.