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Search Results: 1 - 10 of 176073 matches for " Yu-Chun Wang "
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Association between Temperature and Emergency Room Visits for Cardiorespiratory Diseases, Metabolic Syndrome-Related Diseases, and Accidents in Metropolitan Taipei
Yu-Chun Wang, Yu-Kai Lin
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0099599
Abstract: Objective This study evaluated risks of the emergency room visits (ERV) for cerebrovascular diseases, heart diseases, ischemic heart disease, hypertensive diseases, chronic renal failure (CRF), diabetes mellitus (DM), asthma, chronic airway obstruction not elsewhere classified (CAO), and accidents associated with the ambient temperature from 2000 to 2009 in metropolitan Taipei. Methods The distributed lag non-linear model was used to estimate the cumulative relative risk (RR) and confidence interval (CI) of cause-specific ERV associated with daily temperature from lag 0 to lag 3 after controlling for potential confounders. Results This study identified that temperatures related to the lowest risk of ERV was 26 °C for cerebrovascular diseases, 18 °C for CRF, DM, and accidents, and 30 °C for hypertensive diseases, asthma, and CAO. These temperatures were used as the reference temperatures to measure RR for the corresponding diseases. A low temperature (14°C) increased the ERV risk for cerebrovascular diseases, hypertensive diseases, and asthma, with respective cumulative 4-day RRs of 1.56 (95% CI: 1.23, 1.97), 1.78 (95% CI: 1.37, 2.34), and 2.93 (95% CI: 1.26, 6.79). The effects were greater on, or after, lag one. At 32°C, the cumulative 4-day RR for ERV was significant for CRF (RR = 2.36; 95% CI: 1.33, 4.19) and accidents (RR = 1.23; 95% CI: 1.14, 1.33) and the highest RR was seen on lag 0 for CRF (RR = 1.69; 95% CI: 1.01, 3.58), DM (RR = 1.69; 95% CI: 1.09, 2.61), and accidents (RR = 1.19; 95% CI: 1.11, 1.27). Conclusions Higher temperatures are associated with the increased ERV risks for CRF, DM, and accidents and lower temperatures with the increased ERV risks for cerebrovascular diseases, hypertensive diseases, and asthma in the subtropical metropolitan.
A Generalized GPS Algorithm for Reducing the Bandwidth and Profile of a Sparse Matrix
Qing Wang;Yu-Chun Guo;Xiao-Wei Shi
PIER , 2009, DOI: 10.2528/PIER09010512
Abstract: A generalized GPS (GGPS) algorithm is proposed for the problem of reducing the bandwidth and profile of the stiffness matrix in finite element problems. The algorithm has two key-points. Firstly and most importantly, more pseudo-peripheral nodes are found, used as the origins for generating more level structures, rather than only two level structures in the GPS (Gibbs-Poole-Stockmeyer) algorithm. A new level structure is constructed with all the level structures rooted at the pseudo-peripheral nodes, leading to a smaller level width than the level width of any level structure's in general. Secondly, renumbering by degree is changed to be sum of the adjacent nodes codes to make a better renumbering in each level. Simulation results show that the GGPS algorithm can reduce the bandwidth by about 37.63% and 8.91% and the profiles by 0.17% and 2.29% in average for solid models and plane models, respectively, compared with the outcomes of GPS algorithm. The execution time is close to the GPS algorithm. Empirical results show that the GGPS is superior to the GPS in reducing bandwidth and profile.
Acute and Prolonged Adverse Effects of Temperature on Mortality from Cardiovascular Diseases
Yu-Kai Lin, Chin-Kuo Chang, Yu-Chun Wang, Tsung-Jung Ho
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0082678
Abstract: Background Cardiovascular diseases are the leading causes of death worldwide, especially for developed countries. Elevated mortality from cardiovascular diseases has been shown related to extreme temperature. We thus assessed the risk of mortality from cerebrovascular diseases, heart diseases, and ischemic heart disease (IHD) in relation to temperature profiles in four subtropical metropolitans (Taipei, Taichung, Tainan, and Kaohsiung) from 1994 to 2007 in Taiwan. Methods Distributed lag non-linear models were applied to estimate the cumulative relative risks (RRs) with confidence intervals of cause-specific mortality associated with daily temperature from lag 0 to 20 days, and specific effect of extreme temperature episodes with PM10, NOx, and O3, and other potential confounders controlled. Estimates for cause-specific mortalities were then pooled by random-effect meta-analysis. Results Comparing to centered temperature at 27°C, the cumulative 4-day (lag 0 to 3) risk of mortality was significantly elevated at 31°C for cerebrovascular diseases (RR = 1.14; 95% CI: 1.00, 1.31) and heart diseases (RR = 1.22; 95% CI: 1.02, 1.46) , but not for IHD (RR = 1.09; 95% CI: 0.99, 1.21). To the other extreme, at 15°C, the cumulative 21-day (lag 0 to 20) risk of mortality were also remarkably increased for cerebrovascular diseases, heart diseases, and IHD (RRs = 1.48 with 95% CI: 1.04, 2.12, 2.04 with 95% CI: 1.61, 2.58, and 1.62 with 95% CI: 1.30, 2.01, respectively). Mortality risks for cardiovascular diseases were generally highest on the present day (lag 0) of extreme heat. No particular finding was detected on prolonged extreme temperature event by pooling estimations for cause-specific mortality. Conclusions Low temperature was associated with greater risk of mortality from cardiovascular diseases in comparison with that of high temperature. Adverse effects of extreme temperatures are acute at the beginning of exposure.
Kinetics of Synthesis Nanophosphor Eu0.12Y1.78Ca0.10O3―δ
SI Wei, WANG Jing, WANG Xiu-Hui, GAO Hong, ZHAI Yu-Chun
无机材料学报 , 2011, DOI: 10.3724/sp.j.1077.2011.00726
Abstract: The nanophosphor Eu0.12Y1.78Ca0.10O3―δ was synthesized by homogeneous precipitation method under ultrasonic condition. The structures, composition and morphology of the nanophosphor Eu0.12Y1.78Ca0.10O3―δ were characterized by X―ray diffraction(XRD), energy dispersive spectrometre(EDS), inductively coupled plasma atomic emission spectrometry(ICP―AES) and transmission electron microscope(TEM). The synthesis kinetics of nanophosphor Eu0.12Y1.78Ca0.10O3―δ was investigated using differential thermal analysis and thermo gravimetric analysis (DTA―TG) at different heating rates in argon. The results show that the Eu0.12Y1.78Ca0.10O3―δ is body―centered― cubic―structured spherical nano―polycrytalline with grain size of 20nm. The precursor of nanophosphor Eu0.12Y1.78Ca0.10O3―δ is Y(OH)3 with hexagonal phase structure. The average apparent activation energy of the three reaction stages of precursor is calculated to be 102.06, 488.00 and 302.74kJ/mol by using the Doyle―Ozawa and Kissinger methods, respectively. The reaction order and frequency factor are determined by Kissinger method. The kinetics equations of each reaction stage is deduced as dα/dt=8.86×108e―12280/T(1―α)1.36; dα/dt=4.05× 1033e―58700/T(1―α)1.32; dα/dt=7.14×1019e―36410/T(1―α)1.27.
Process Control in Bioenergy Preparation via Biochemical Routes

WANG Yu-chun,ZENG Jian-li,

过程工程学报 , 2008,
Abstract: 对生物化学法制备生物能源过程中的过程调控进行了综述.生物化学法制备生物柴油、乙醇、氢气等生物能源易受底物、抑制物、反应条件等影响.为提高反应效率,在生物化学法制备生物能源过程中广泛采用底物预处理、反应物流加、固定化酶及细胞、减少抑制物及共培养等多种措施,对制备过程进行调控.在对现有调控总结的基础上指出,过程调控应该在全面理解分子、细胞、菌群多层次反应机理及相互关系的基础上进行全过程、多尺度的调控.
A Case Study on Plateau Vortex Inducing Southwest Vortex and Producing Extremely Heavy Rain

ZHAO Yu-chun,WANG Ye-hong,

高原气象 , 2010,
Abstract: 利用多途径探测与再分析资料, 通过诊断分析、 数值模拟和敏感性试验, 对2008年7月20~21日一次高原涡东移诱生西南涡并引发川中特大暴雨的天气过程进行了初步分析, 探讨了西南涡特大暴雨发生的中尺度环境场特征, 特殊地形和非绝热物理过程在高原涡东移诱生西南涡特大暴雨中的作用。结果表明, 高原涡形成后沿高原东北侧下滑, 在四川盆地诱生出西南涡, 川中特大暴雨在西南涡形成过程中由强中尺度对流系统(MCSs)的活动造成。高原涡东移诱生的低层偏东气流在川西高原东侧地形的动力强迫抬升作用下, 释放对流有效位能激发出MCSs产生强降水, 降水凝结潜热加热反馈驱动西南涡快速发展。地形的动力作用仅能形成浅薄的西南涡, 降水凝结潜热的加入才能使西南涡充分发展。高原涡的发展主要受地面热通量影响, 它的发展与否在很大程度上决定西南涡能否形成。盆地周边高大山脉对西南涡的位置分别有不同程度的影响, 而盆地周边高大山脉上叠加的中小尺度地形对西南涡和暴雨带的整体位置影响不大, 在一定程度上影响暴雨的落区。
The Covariance Structure Model Analysis of the Factors affecting the Entrepreneur's Human Capital Pricing in Venture Capital
Yu-chun WEN
Canadian Social Science , 2007,
Abstract: This paper carries on the analysis of the factors affecting entrepreneur's human capital pricing in venture capital, focusing on the much-dimensionality characteristic, then establishes a logical and comprehensive theory frame which can reflect all the factors affecting entrepreneur's human capital pricing. Further by using covariance structure model (CSM), we make an empirical analysis of these factors. The result shows, in venture capital the control rights of entrepreneur is the most important factor affecting the entrepreneur's human capital pricing, the scale of enterprise is the least one, with the enterprise management performance in the middle. Key Words: venture capital, the entrepreneur's human capital pricing, factors, covariance structure model Résumé: L’article présent, sur la base de l’analyse des facteurs affectant la fixation du prix du capital humain de l’entrepreneur dans l’investissement-risque, a établi pour ce problème multi-dimensions un cadre théorique logique et capable de refléter complètement ces facteurs influants. L’auteur adopte d’ailleurs la méthode analytique du modèle de la structure de covariance (CSM) pour effectuer une étude positiviste sur ces facteurs. Le résultat montre que, dans l’investissement-risque, le pouvoir de contr le de l’entrepreneur est le premier facteur en jeu, la perfomance de l’entreprise le deuxième et la dimension de l’entreprise le dernier. Mots-Clés: investissement-risque, fixation du prix du capital humain de l’entrepreneur, facteurs affectants
Effect of Heated Wall on Extended Self-Similarity of Wall Turbulence

JIANG Nan,WANG Yu-chun,WANG Zhen-dong,SHU Wei,

实验力学 , 2001,
Abstract: 用热线风速仪测量了风洞中壁面加热和不加热平板湍流边界层不同法向位置的瞬时流向速度的时间序列,研究了壁面加热的边界条件对流向速度增量的p阶结构函数的扩展的自相似性和层次结构模型的影响。实验结果表明,壁面加热的边界条件对流向速度增量的结构函数扩展的自相似标度律的相对标度指数δ(p,3)和层次结构模型中间歇参数β、最奇异指数γ的影响明显存在。
Research Advances in Immunomodulation and Antitumor Activity of Polysaccharides

WANG Tong-yi,ZHAO Bing,WANG Yu-chun,

过程工程学报 , 2006,
Abstract: Enhancing immunity and antiturnor activity is the important biological activity of polysaccharide. Studies showed that it enhanced immunity through improving the activity of immtmocyte, activising the secretion of cell factor, inducing the production of antibody and activising the complementary system, etc. The antitumor ways of polysaccharide mainly were inhibiting the growth of cancer cells and the synthesis of protein and nuclear acid in the cells, inducing apoptosis, affecting the expression of cancer gene and changing the growing specialities of the cancer cell membrane. In this review, research advances in the field of immunomodulation and antitumor activity ofpolysaccharides in recent years were briefly summarized and analysed.
Application of Rare Earth Elements in Medicinal Plant Cell and Tissue Culture

YUAN Xiao-Fan ZHAO Bing WANG Yu-Chun,

植物学报 , 2005,
Abstract: Here we discussed the effects of rare earth elements on the growth of medicinal plant cell and tissue cultured in vitro and biosynthesis of secondary metabolites in the cultured materials.Increased data has shown that the application of rare earth elements has splendid prospects in medicinal plant cell and tissue culture.
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