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Search Results: 1 - 10 of 5779 matches for " Xiaofeng Duan "
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Effective Mass of Acoustic Polaron in Quantum Dots  [PDF]
Hao Li, Junhua Hou, Xiaofeng Duan
World Journal of Condensed Matter Physics (WJCMP) , 2015, DOI: 10.4236/wjcmp.2015.51005
Abstract: The variational effective mass with respect to the e-p coupling constant for different values of cutoff wave vector is performed in quantum dot. The self-trapping transition of acoustic polaron in quantum dot is reconsidered by character of the effective mass curve varying with the e-p coupling. The holes are determined to be self-trapped in AlN quantum dot systems.

DUAN Xiaofeng,ZHU Jing,GUO Kexin,

金属学报 , 1987,
Abstract: EXELFS of graphite has been analyzed by maximum entropy method (MEM) and fast fourier transformation (FFT). Comparision of the two methods shows that MEM gives much higher resolution than FFT does.
The Relationship between Pollutant Emission and Economic Development in Shandong Province

DUAN Xiaofeng,XU Xuegong,

地理科学进展 , 2010,
Abstract: With the Environmental Kuznets Curve(EKC),the relationship between environmental pollutant emission and economic development in Shandong Province was studied in this paper.The environmental pollution indexes included the effective emissions of industrial wastewater,SO2,smokes,and industrial total solid wastes.Based on the cubic polynomial regression analysis with GDP per capita as independent variable,EKC model was established to describe the changing trend of environmental pollution indexes from 1981 to 20...
Emergy Analysis for Sustainable Development of Resources-Environment-Economy System in the Yellow River Delta

DUAN Xiaofeng,XU Xuegong,

地理科学进展 , 2006,
Abstract: As an ecologically vulnerable region where atmosphere, hydrosphere, geosphere and biosphere interact, the Yellow River Delta plays an important role both in economy and environment in China. The emergy theory is based on the theory and methods of the System Ecology. Forming 1J higher quality energy will need a large amount of lower quality energy. In other words, different forms of energy have different attributions. By dealing with the energy-value-process of ecosystem, the theory provides us with a new approach to the economic ecology. Based on emergy analysis, this article systematically analyzes energy, resource flowage and condition of eco-economy system in the Yellow River Delta. On the basis of the evaluation indicator system, resources-environment-economy system in the Yellow River Delta is assessed comprehensively. The results indicate that the total emergy consumption of the study region is about 1.76×1022sej,or about US$ 8.42×109. The waste emerge evacuated from the study region reaches about 5.74×1021sej,or about US$ 2.74×109, which indicates that environment in the Yellow River Delta degenerates rapidly because of the industrialization and economic increasing. Finally, based on the calculation of the emergy sustainable indices (ESI), we find that economy increasing of the study region depends on resources consumption. Although the value of resource reserves in the Yellow River Delta reaches US$ 4.45×1012 (about 529 times larger than GDP), it is difficult to use it adequately because of technical limits. So enhancing the resources utilization efficiency and reducing waste are the primary tasks in the future in order to realize sustainable development in the Yellow River Delta.
PID Controller Based on Memristive CMAC Network
Lidan Wang,Xiaoyan Fang,Shukai Duan,Xiaofeng Liao
Abstract and Applied Analysis , 2013, DOI: 10.1155/2013/510238
Searching for Stable SinCn Clusters: Combination of Stochastic Potential Surface Search and Pseudopotential Plane-Wave Car-Parinello Simulated Annealing Simulations
Xiaofeng F. Duan,Larry W. Burggraf,Lingyu Huang
Molecules , 2013, DOI: 10.3390/molecules18078591
Abstract: To find low energy Si nC n structures out of hundreds to thousands of isomers we have developed a general method to search for stable isomeric structures that combines Stochastic Potential Surface Search and Pseudopotential Plane-Wave Density Functional Theory Car-Parinello Molecular Dynamics simulated annealing (PSPW-CPMD-SA). We enhanced the Sunders stochastic search method to generate random cluster structures used as seed structures for PSPW-CPMD-SA simulations. This method ensures that each SA simulation samples a different potential surface region to find the regional minimum structure. By iterations of this automated, parallel process on a high performance computer we located hundreds to more than a thousand stable isomers for each Si nC n cluster. Among these, five to 10 of the lowest energy isomers were further optimized using B3LYP/cc-pVTZ method. We applied this method to Si nC n ( n = 4–12) clusters and found the lowest energy structures, most not previously reported. By analyzing the bonding patterns of low energy structures of each Si nC n cluster, we observed that carbon segregations tend to form condensed conjugated rings while Si connects to unsaturated bonds at the periphery of the carbon segregation as single atoms or clusters when n is small and when n is large a silicon network spans over the carbon segregation region.
Measurement of the remnant magnetic-field in Lorentz mode using permalloy

Haihua LIU,Xiaokun DUAN,Renchao CHE,Zhifeng WANG,Xiaofeng DUAN,

金属学报(英文版) , 2009,
Abstract: A novel method was reported to measure the remnant magnetic field in Lorentz mode in a FEI Tecnai F20 transmission electron microscope equipped with a Lorentz lens. The movement of the circle Bloch line of the cross-tie wall in Permalloy is used to measure the remnant magnetic field by tilting the specimen and adjusting the objective lens current. The remnant magnetic field is estimated to be about 17 Oe, in a direction opposite to that of the objective lens magnetic field. The remnant magnetic field can be compensated by adjusting the value of the objective lens current.
Alcohol Use and Subsequent Sex among HIV-Infected Patients in an Ethnic Minority Area of Yunnan Province, China
Xiaofeng Luo, Song Duan, Qixiang Duan, Yongcheng Pu, Yuecheng Yang, Yingying Ding, Meiyang Gao, Na He
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0061660
Abstract: Objective To examine alcohol use and subsequent HIV risky behaviors among a sample of predominately ethnic minority people living with HIV/AIDS (PLWHA) in a rural community in Yunnan Province, China. Method A cross-sectional study with a face-to-face questionnaire interview was conducted among eligible participants. Results In total, 455 (94.4%) out of 482 eligible HIV patients participated in the study. Of them, 82.6% were ethnic minorities; 15.4% were never married; 96.5% were sexually experienced; 55.4% had used drugs, 67% were receiving antiretroviral therapy (ART). Over 65% were ever drinkers; of whom 61.5% were current drinkers. Among current drinkers, 32.4% drank daily and 41.2% were hazardous drinkers. Chinese white wine was the preferred choice. Higher level of alcohol use among drinkers in the preceding month was positively associated with being males (OR = 2.76, 95%CI: 1.03–7.43), ethnic minorities (OR Jingpo = 2.21, 95%CI: 1.06–4.59; OR other minorities = 3.20, 95%CI: 1.34–7.62), higher education (OR1–6 = 1.98, 95%CI: 0.99–3.96; OR≥7 = 2.35, 95%CI: 1.09–5.06) and being ART-naive (OR = 2.69, 95%CI: 1.67–4.32). About 39% of ever drinkers reported having engaged in sex after drinking since HIV diagnosis. Those who were younger than 46 years (OR16–25 = 7.77, 95%CI: 1.22–49.60, OR26–35 = 2.79, 95%CI: 1.06–7.35, OR36–45 = 2.96, 95%CI: 1.57–7.58), hazardous drinkers (OR = 1.99, 95%CI: 1.00–3.97) and drug users (OR = 3.01, 95%CI: 1.19–7.58) were more likely to have had sex after drinking. Approximately 56% of drug users had used drugs after drinking. Conclusions High prevalence of alcohol use and subsequent risky behaviors including sexual engagement and drug use among HIV patients in rural Yunnan require tremendous and integrated efforts for prevention and control of alcohol and drug abuse and HIV spreading.
Effect of Silicon-on-Insulator Substrate on Residual Strain in 3C-SiC Films
Wang Xiaofeng,Huang Fengyi,Sun Guosheng,Wang Lei,Zhao Wanshun,Zeng Yiping,Li Haiou,Duan Xiaofeng,
Wang Xiaofeng
,Huang Fengyi,Sun Guosheng,Wang Lei,Zhao Wanshun,Zeng Yiping,Li Haiou,and Duan Xiaofeng

半导体学报 , 2005,
Abstract: One group of SiC films are grown on silicon-on-insulator (SOI) substrates with a series of silicon-over-layer thickness.Raman scattering spectroscopy measurement clearly indicates that a systematic trend of residual stress reduction as the silicon over-layer thickness decreases for the SOI substrates.Strain relaxation in the SiC epilayer is explained by force balance approach and near coincidence lattice model.
How Often Are Major Blood-Borne Pathogens Found in Eye Patients? A Serosurvey at an Eye Hospital in Southern China
Fang Duan, Qiang Huang, Jingyu Liao, Dajun Pang, Xiaofeng Lin, Kaili Wu
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0073994
Abstract: Background The hepatitis B virus (HBV), hepatitis C virus (HCV), human immunodeficiency virus (HIV) and treponema pallidum (TP) are blood-borne pathogens. They can lead to nosocomial and occupational infections in health care settings. We aimed to identify the prevalence of and risk factors associated with HBV, HCV, HIV and TP infections among patients with eye diseases at a tertiary eye hospital in Southern China. Methods From July 2011 to June 2012, a total of 26,386 blood units were collected from eye patients, including inpatients and the day surgery patients at Zhongshan Ophthalmic Center, one of the biggest eye hospitals in China. Based on the primary diagnoses from this period, the subjects were classified into different ocular disease groups. All blood samples were tested for HBsAg, anti-HCV, anti-HIV and anti-TP. Result The overall prevalence of HBV, HCV, TP and HIV was 9.79%, 0.99%, 2.43% and 0.11%, respectively. The prevalence of HBsAg was much lower among patients younger than 20 years compared to other age groups. In addition, the risk of HBsAg was associated with the male gender, ocular trauma and glaucoma. The prevalence of TP increased with age and the prevalence among patients older than 30 was higher than that in patients younger than 20 years. Conclusions The prevalence of HBV, HCV, HIV and TP in patients with eye diseases was identified. This information can be utilised to strengthen the health education and implementation of universal safety precautions to prevent the spread of blood-borne pathogens in health care settings.
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