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Search Results: 1 - 10 of 202396 matches for " Li Zhang "
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Determinants of Living Arrangements among the Chinese Elderly: New Evidence from the CLHLS 2011 Wave  [PDF]
Zhang Li
Chinese Studies (ChnStd) , 2015, DOI: 10.4236/chnstd.2015.41006
Abstract: This research examines the determinants of living arrangements among the Chinese elderly by distinguishing the seniors by sex, residence and age. Through analyzing data from the 2011 wave of Chinese Longitudinal Healthy Longevity Survey (CLHLS), the results show that about 80% of the elderly still chose to co-reside with other family members and only 2% of them lived in institutions. Having children nearby who visited frequently, high education, pension coverage and social integration generally decrease the odds of co-residing. Having activity of daily living (ADL) disabilities, higher household income, homeownership and preferring living with others increase the likelihood of co-residing. Currently married individuals, females and minorities are more likely to live with others. Co-residing also increases with age. However, the effects of the above factors on the subgroups’ living arrangements differ substantially. Male and urban residents’ living arrangement determinants are more similar, whereas female and rural residents’ co-residing determinants are more comparable. Age of 75 is found to be a bench mark differentiating living arrangement patterns and determinants for seniors. The study draws future research attention to developing separate models understanding the elderly subgroups’ living arrangements.
Living Arrangements and Subjective Well-Being among the Chinese Elderly  [PDF]
Li Zhang
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.33024
Abstract: This research examines how household context mediates with social participation and intergen-erational relations to impact subjective well-being among the elderly aged 65 and over in China. Through analyzing data from the 2011 wave of Chinese Longitudinal Healthy Longevity Survey (CLHLS), the results show that living alone or in institutions links to negative well-being of the elderly. A higher level of social participation and better intergenerational relations promote positive well-being and reduce negative well-being. However, only social participation interacts with living arrangements when influencing the elderly’s subjective well-being. Specifically, a higher level of social integration significantly reduces negative well-being for individuals living in institutions. The findings call future research attention to explore factors that may reduce negative well-being of the elderly living alone or living in institutions.
How Does Age Matter in the Linkage between Religious Involvement and Adult Self-Rated Health?  [PDF]
Li Zhang
Advances in Applied Sociology (AASoci) , 2015, DOI: 10.4236/aasoci.2015.54014
Abstract: Through conducting an age, period, and cohort analysis by running cross-classified random effect models, this research studies how age plays a role in the religious involvement and health relationship. Data are drawn from the U.S. General Social Survey, 1972 to 2008. For the most part, the results show that after controlling for the cohort and period effects, there is a loss of advantages in health with age for those who are more involved in religion. This finding suggests that when the period and cohort effects are taken into consideration, the cumulative advantage theory may not be supported in this case.
Research on Application of ZigBee Technology in Flammable and Explosive Environment  [PDF]
Yang Li, Ke Zhang
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.26058
Abstract: Wireless Sensor Network based on ZigBee technology is a wireless network which is composed of many nodes of ZigBee RF chips, sensors and MCUs, especially suitable for application of the remote monitoring system in flammable and explosive environments. This paper presents the characteristics and advantages of ZigBee technology, also discusses the system for hardware and software design. This system effectively fulfills the remote monitoring in flammable and explosive environments and posses high practical values.
Research on Model and Mechanism of Autonomous Management for Cellular Manufacturing  [PDF]
Qingshan Zhang, Xiang Li
iBusiness (IB) , 2011, DOI: 10.4236/ib.2011.32016
Abstract: International Engineering Consortium predicted that cellular manufacturing would become the main production model of manufacturing enterprises in the future. Based on elaborating the basic concepts, this paper proposes organizational forms, autonomous management models and coordination mechanism of cellular manufacturing, and takes expected return of two production cells as a coordination example, then gives coordination process and coordination strategy of cellular manufacturing, so as to expand production management theory and provide reference to cellular manufacturing enterprises.
Solutions with Dead Cores for a Parabolic P-Laplacian Equation  [PDF]
Zhengce Zhang, Yanyan Li
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.15050
Abstract: We study the solutions with dead cores and the decay estimates for a parabolic p-Laplacian equation with absorption by sub- and supersolution method. Special attention is given to the case where the solution of the steady-state problem vanishes in an interior region.
Quenching Rate for the Porous Medium Equation with a Singular Boundary Condition  [PDF]
Zhengce Zhang, Yanyan Li
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.29157
Abstract: We study the porous medium equation ut=(um). 0<x<∞, t>0 with a singular boundary condition (um) (0,t)=u(0,t). We prove finite time quenching for the solution at the boundary χ=0. We also establish the quenching rate and asymptotic behavior on the quenching point.
An Energy-Based Stochastic Model for Wireless Sensor Networks  [PDF]
Yuhong Zhang, Wei Li
Wireless Sensor Network (WSN) , 2011, DOI: 10.4236/wsn.2011.39035
Abstract: We propose an energy-based stochastic model of wireless sensor networks (WSNs) where each sensor node is randomly and alternatively in an active and a sleep mode. We first investigate the sensor model and derive the formula of the steady-state probability when there are a number of data packets in different sensor modes. We then determine important sensor’s performance measures in terms of energy consumptions, average data delay and throughput. The novelty of this paper is in its development of a stochastic model in WSN with active/sleep feature and the explicit results obtained for above mentioned energy consumption and performance characteristics. These results are expected to be useful as the fundamental results in the theoretical analysis and design of various hybrid WSNs with power mode consideration.
Fabrication of Poly(Aspartic Acid)-Nanogold Modified Electrode and Its Application for Simultaneous Determination of Dopamine, Ascorbic Acid, and Uric Acid  [PDF]
Juan Li, Xiaoli Zhang
American Journal of Analytical Chemistry (AJAC) , 2012, DOI: 10.4236/ajac.2012.33028
Abstract: A nanostructured polymer film incorporated gold nanoparticles modified electrode was fabricated. The fabrication process involved a previous electropolymerization of aspartic acid and followed by the eletrodeposition of gold nano-particles on the glassy carbon electrode. The resulting poly (aspartic acid)-nanogold modified electrode (PAA- nano-Au/GCE) was characterized by scanning electron microscopy (SEM) and electrochemical impedance spectros-copy (EIS). A higher catalytic activity was obtained to electrocatalytic oxidation of dopamine (DA), ascorbic acid (AA) and uric acid (UA) due to the enhanced peak current and well-defined peak separations compared with three, bare GCE, PAA/GCE and nano-Au/GCE. Simultaneous determination of DA, AA, and UA were studied by voltammetry. The linear range of 5.0 × 10-7 - 1.0 × 10-4 M for DA, 5.0 × 10-6 - 2.0 × 10-3 M for AA and 5.0 × 10-6 - 1.0 × 10-3 M for UA was obtained. The detection limit was calculated for DA, AA and UA as being 6.5 × 10-8 M, 5.6 × 10-7 M and 3.0 × 10-7 M, respectively (S/N = 3). The practical application of the present modified electrode was demonstrated by the determination of DA, AA and UA in calf serum and fetal calf serum samples.
Numerical Investigation on Vortex Structure and Aerodynamic Noise Performance of Small Axial Flow Fan  [PDF]
Li Zhang, Yingzi Jin
Open Journal of Fluid Dynamics (OJFD) , 2012, DOI: 10.4236/ojfd.2012.24A046
Abstract: The details of unsteady flow field in small axial fans are described and the relationship between the internal flow char- acteristics and aerodynamic noise of small axial flow fans are explored in the manuscript. Firstly, the broadband noise model is introduced to calculate the distributions of broadband noise sources in fan’s internal flow field, and further fan’s internal flow characteristics affecting broadband noise sources are analyzed by the main distributions of broad- band noise sources. Secondly, the unsteady characteristics of vortex structure in fan’s internal flow field are analyzed by large eddy simulation, and FH-W acoustic model is introduced to calculate aerodynamic noise affected by the unsteady characteristics of vortex structure. Finally, Monitoring points are set up near and far field of small axial fans, at which sound pressure level and spectral characteristics are analyzed. The results show that broadband noise sources are mainly distributed at the tip clearance close to blade trailing edge and one third of chord length of blade trailing edge of small axial fans. The maximum sound power of broadband noise sources at the tip clearance is greater than that at blade trail- ing edge. Sound power level of broadband noise near one third of blade chord length of blade trailing edge is first in- creasing and then decreasing when the distance between radial planes and the center of fan hub increases. Fan’s internal flow characteristics affecting broadband noise sources are the tip leakage vortex and the trailing edge vortex shedding. The tip leakage vortices at the leading edge of blade tip first integrate and then break down, while vortex cores of the trailing edge vortex shedding gradually move from blade hub to one-third of blade chord
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