| 1 | Physical activity and cognitive function among older adults in China:A systematic review显示文摘Background: Physical activity(PA) has been shown to benefit cognitive function in older adults. However, the cognitive benefits of exercising for older Chinese adults have not been systematically documented. This study was to conduct a systematic review on evidence that PA is beneficial for cognitive functioning in older Chinese adults.Methods: Major databases, including Pub Med, EMBASE, Cochrane Library, Wan Fang, CNKI, and VIP, were searched for studies published in English or Chinese between January 2000 and December 2015. Randomized and non-randomized controlled trials(RCTs and non-RCTs), cohort,case-control and cross-sectional studies that evaluated PA and cognitive function among older Chinese adults were included in this review.Results: Of 53 studies included and reviewed, 33 were observational(22 cross-sectional, 7 case-control, and 4 cohort) and 20 were experimental(15 RCTs, 5 non-RCTs). Observational studies showed an association of reduced risk of cognitive-related diseases(i.e., mild cognitive impairment, Alzheimer's disease, and dementia) through PA, whereas experimental studies reported exercise-induced improvement in multiple domains of cognitive function(i.e., global cognitive function, memory, executive function, attention, language, and processing recourse).Conclusion: This systematic review provides initial evidence that PA may benefit cognition in older Chinese adults. Further studies of individuals with cognitive impairments and prospective and RCT studies having high scientific rigor are needed to corroborate the findings reported in this review. | Jiaojiao Lü Weijie Fu Yu Liu | 2016 | Journal of Sport and Health Science2016，5，3： | 8 |
| 11 | FABRICATION OF PIEZOELECTRIC BIMORPH USING LEAD ZIRCONATE TITANATE THIN FILM DEPOSITED BY HYDROTHERMAL METHOD显示文摘In order to describe the characteristics of piezoelectric bimorph,properties of lead zirconate titanate (LZT) film are studied by X-ray diffraction (XRD) and scanning eletron microscope (SEM).The ratio of PbTiO_3/PbZrO_3 in LZT is 53/47,which is around morpbotropic phase boundary (MPB).LZT film is composed of cubic particles with the average size of 5μm.Density of thin film is figured out through the datum measured in experiments.The displacement model used to analyze the driving ability of bimorph is set up,and the effect of elastic intermediate layer is taken into account. Piezoelectric coefficient of LZT film is worked out by using the displacement model.Experiments of driving ability show that deformation of bimorph free end does not increase with times of crystal growth processes and the maximum deformation is obtained after two times crystal growth processes. Finally,the ferroelectric property of the bimorph is investigated and coercive voltage of the bimorph is obtained. | DU Liqun Lü Yan DONG Weijie GAO Xiaoguang | 2007 | Chinese Journal of Mechanical Engineering2007，20，6： | 0 |
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