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Characteristics of PM_(2.5) in rural areas of southern Jiangsu Province, China

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Journal of Environmental Sciences 2005年第6期17卷 977-980页

作者： ZHOU Zhen-feng LIU Kang WANG Xiao-rong huang shi-hong School of Environmental Science and Engineering Ocean University of China Qingdao 266003 China Department of Environmental Science Northwest University Xi＇an 710069 China State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Nanjing 210093 China Department of Atmospheric Sciences Nanjing University Nanjing 210093 China

To understand pollution level and possible sources of atmospheric fine particulates in rural areas of southern Jiangsu Province of China, samples of PM2.5 were collected and analyzed in Xueyan Town and Taihu Lake Station over three seasons from July 2002 to January 2003. The mass concentrations of PM2.5 and 14 principal component elements were obtained. The results showed that pollution of PM2.5 was serious and the concentration levels of S, Zn, Pb and As were similar to city. There are different seasonal distribution laws of pollutant elements in PM2.5 between two sampling sites, probably due to contribution of local sources, medium or long distance transportation of fine particulates and complicated meteorological conditions. The enrichment levels of S, Zn, Pb, As, K were high, reflecting the influence of anthropogenic activities. Particularly enrichment level of S was much higher in summer, which was probably related to meteorological condition. The result of principal components analysis showed major sources of PM2.5 included crustal resuspension, coal burning, metal processing industry or waste incineration, vehicular emission, which suggests anthropogenic activities is of important influence on PM2.5 in rural areas of southern Jiangsu Province.

关键词： rural areas PM2.5 sources enrichment factor principal components analysis

Evolution of Mobility Function in Chinese Elders during the 6 Months of Nutritional Supplementation and Age-adapted Physical Activities: A Feasibility Study

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Biomedical and Environmental Sciences 2021年第11期34卷 900-904页

作者： CHANG Cui Qing KARAGOUNIS Leonidas G YU Ying Xiang YIN Jing DONATO-CAPEL Laurencel SHEVLYAKOVA Maya BEAUMONT Maurice huang hong shi OFFORD Elizabeth A HORCAJADA MarieNoelle Institute of Sports Medicine Peking University Third HospitalBeijing 100191China Nestle Health Science Translation ResearchEpalingesSwitzerland University of Bern Institute of Social and Preventive Medicine(ISPM)BernCH Nestle Research Center Beijing 100095China Nestle Research LausanneSwitzerland

Knee pain and discomfort appear at the early stages of normal aging,which lead to impaired mobility and reduced quality of life(QOL).Among age-related conditions,osteoarthritis(OA)is considered the most significant cause of disability The acceleration of the aging process in China has troubled the middle-aged and elderly with a relatively high prevalence of OA,as recently reported in a meta-analysis pooling and analyzing epidemiological publications on OA in the middleaged and elderly Chinese published from 2000 to2018[1].

关键词： aging impaired acceleration

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逆向工程在通用发电机设计流程中的应用

包装工程 2016年第2期37卷 175-178页

作者：黄诗鸿重庆工业职业技术学院重庆401120

目的通过分析逆向工程在通用发电机设计中的具体应用,实现逆向工程的设计方法与流程,探索逆向工程在创新设计中的积极意义及价值,摆正逆向工程在现代产品设计流程中的位置。方法通过以重庆比阳产品设计有限公司的实际项目2KW全包式通用... 详细信息

目的通过分析逆向工程在通用发电机设计中的具体应用,实现逆向工程的设计方法与流程,探索逆向工程在创新设计中的积极意义及价值,摆正逆向工程在现代产品设计流程中的位置。方法通过以重庆比阳产品设计有限公司的实际项目2KW全包式通用汽油发电机ZT087为例,解析逆向工程的具体流程与设计方法。结论逆向工程是一种行之有效的产品创新设计程序,可以为设计带来很多好处。这种设计手段可以有效地节约设计时间,提高设计工作效率,能有效解决设计师和工程师在设计和制造之间的矛盾,提高产品开发的效率。

关键词：逆向工程设计流程通用发电机

Factors affecting proprioceptive recovery after anterior cruciate ligament reconstruction

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Chinese Medical Journal 2008年第22期121卷 2224-2228页

作者： ZHOU Mou-wang GU Li CHEN Ya-ping YU Chang-long AO Ying-fang huang hong-shi YANG Yan-yan Department of Rehabilitation Medicine Peking University Third Hospital Beijing 100191 China Department of Sports Medicine Peking University Third Hospital Beijing 100191 China

Background Proprioception plays an important role in knee movements. Since there are controversies surrounding the overall recovery time of proprioception following surgery, it is necessary to define the factors affecting proprioceptive recovery after anterior cruciate ligament （ACL） reconstruction and to investigate the relationship between proprioception and muscle strength. Methods A total of 36 patients who had their ACL reconstructed with a semitendinosus/gracilis graft （reconstructed group： 6 months post-surgery） and 13 healthy adults without any knee injury （control group） were included in the study. Knee proprioception was evaluated with a passive reproduction test. Isokinetic strength was measured using the Biodex System. Statistical analysis was used to compare proprioception of the reconstructed group versus the control group, and to define causal factors, including sex, hamstring/quadriceps ratio, and the course of injury before reconstruction, We also investigated the correlation between the passive reproduction error and quadriceps index. Results There was a significant difference in proprioception between the reconstructed and control groups （P 〈0.05）. When the course of injury before reconstruction was less than 4 months, there was a linear correlation with proprioception 6 months after the operation （r=0.713, P 〈0.05）. There was a positive correlation between post-surgery proprioception and the quadriceps index at 6 months post-surgery. Conclusions Impaired knee proprioception is observed 6 months after ACL reconstruction. Within 4 months of injury, early undertaking of reconstruction is associated with better proprioception outcome. Patients with enhanced proprioception have a better quadriceps index.

关键词： anterior cruciate ligament reconstruction " proprioception " muscle strength

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普安鲫群体克隆组成的初步研究

贵州农业科学 2012年第9期40卷 176-179页

作者：安苗黄仕洪李勇贵州大学动物科学学院贵州贵阳550025 贵州省普安鲫原种场贵州普安561502 贵州省普安县渔业局贵州普安561500

为评价普安鲫种质特性、鉴别和标记群体内不同雌核发育系(克隆)及选育新品种奠定基础,运用聚丙烯酰胺凝胶电泳方法,分析了81尾普安鲫的血清转铁蛋白电泳表型及多样性。结果表明:普安鲫群体内分布有13个不同雌核发育克隆,其群体表现出丰... 详细信息

为评价普安鲫种质特性、鉴别和标记群体内不同雌核发育系(克隆)及选育新品种奠定基础,运用聚丙烯酰胺凝胶电泳方法,分析了81尾普安鲫的血清转铁蛋白电泳表型及多样性。结果表明:普安鲫群体内分布有13个不同雌核发育克隆,其群体表现出丰富的遗传组成和较高的克隆多样性;揭示了普安鲫克隆多样性及体型变化可能与群体内进行有性生殖和遗传物质重组有关。

关键词：普安鲫转铁蛋白克隆多样性

多值微分系统及动态规划中的泛函方程的可解性

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数学学报（中文版） 2004年第3期47卷 479-486页

作者：洪世煌海南大学信息学院应用数学系海口570228

本文利用不动点定理获得了完备距离空间中多值微分方程的非线性过值问题的解的存在性定理,同时给出了动态规划中的一类泛函方程的解存在性的充分条件。

关键词：偏序不动点多值微分系统

大气环境及化学组分对气溶胶辐射特性影响研究

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过程工程学报 2004年第z1期4卷 838-844页

作者：董真黄世鸿李子华南京气象学院江苏南京210044 南京大学江苏南京210093

实验测量了在不同相对湿度下大气气溶胶光学折射指数虚部值,研究了虚折射指数与相对湿度的关系;同时对气溶胶粒子进行了化学分析,研究了虚折射指数与元素成分之间的相互关系.结果指出,大气环境湿度及气溶胶粒子化学组分对其光学折射指... 详细信息

实验测量了在不同相对湿度下大气气溶胶光学折射指数虚部值,研究了虚折射指数与相对湿度的关系;同时对气溶胶粒子进行了化学分析,研究了虚折射指数与元素成分之间的相互关系.结果指出,大气环境湿度及气溶胶粒子化学组分对其光学折射指数虚部影响很大.因此,研究大气气溶胶辐射特性时不能不加以考虑.

关键词：气溶胶辐射特性相对湿度化学组分

Chaboche率相关本构模型的数值积分算法

维普期刊数据库评论

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维普期刊数据库

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广西大学学报（自然科学版） 2011年第1期36卷 166-171页

作者：胡桂娟张克实黄世鸿广西大学土木建筑工程学院广西南宁530004 广西建设职业技术学院广西南宁530004

为验证Chaboche率相关本构模型对循环塑性行为的描述能力,研究了有限元计算中本构关系的数值积分过程和Newton-Raphson迭代算法。编写了ABAQUS材料用户子程序UMAT,在此基础上对316不锈钢材料在600℃下的循环特性进行了有限元数值模拟。... 详细信息

为验证Chaboche率相关本构模型对循环塑性行为的描述能力,研究了有限元计算中本构关系的数值积分过程和Newton-Raphson迭代算法。编写了ABAQUS材料用户子程序UMAT,在此基础上对316不锈钢材料在600℃下的循环特性进行了有限元数值模拟。结果表明:该模型对材料率相关性、对称拉压循环特性及棘轮效应的描述与试验相吻合,验证了模型算法的高效性和计算程序的正确性,证实了模型可以合理描述材料在循环载荷下的塑性变形行为。

关键词：本构模型积分算法率相关 316不锈钢

Q235结构钢低周多轴疲劳寿命评估方法的实验研究

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广西大学学报（自然科学版） 2013年第4期38卷 982-990页

作者：张小元张克实黄世鸿顾思远广西大学土木建筑工程学院工程防灾与结构安全教育部重点实验室广西南宁530004

对建筑用Q235结构钢分别在单轴和多轴载荷下进行低周疲劳试验,并利用测得的试验结果对寿命评估方法进行研究。研究结果表明:在相同Von Mises等效应变幅值下,材料的比例拉扭路径疲劳寿命高于单轴拉压疲劳寿命,而非比例路径疲劳寿命低于... 详细信息

对建筑用Q235结构钢分别在单轴和多轴载荷下进行低周疲劳试验,并利用测得的试验结果对寿命评估方法进行研究。研究结果表明:在相同Von Mises等效应变幅值下,材料的比例拉扭路径疲劳寿命高于单轴拉压疲劳寿命,而非比例路径疲劳寿命低于单轴拉压疲劳寿命。按等效应变法进行寿命预测,在非比例加载路径下的预测结果远远超出2倍寿命安全范围区;按临界面法的KBM和Socie模型进行寿命预测能够得到较好的结果,但对圆形路径的高应变幅区得到的结果则过高估计了材料的寿命。在考虑循环过程临界面法向应变影响的基础上,提出了一个改进的考虑临界面拉伸影响的模型,其对比例和非比例路径循环下低周疲劳寿命的评估与实测吻合较好。

关键词： Q235钢多轴疲劳等效应变法临界面法寿命评估