| 1 | 基于去丛聚效应的裂隙岩体渗透性分析显示文摘以表征岩体渗透性的单位吸水量ω为参数,采用基于像元的去丛聚效应方法有效地分析了裂隙岩体的渗透性空间分布规律。将研究区的单位吸水量ω筛选并经权系数校正后,研究发现岩体渗透性参数ω服从对数正态分布规律;各地层的ω均值有较大差异,表现出层状渗透结构特征;断层影响带中含泥量最少的T41地层,其渗透性明显大于其它区同地层的渗透性,表现出带状渗透结构特征。在此研究的基础上,再将去丛聚效应方法应用到渗透性垂向变化规律的研究,结果表明全区及各分区ω在一定范围内随埋深表现出负指数分布规律,表现出壳状渗透结构特征。这些规律为裂隙岩体的渗流计算和模拟奠定了基础。 | 蒋小伟 万力 梁四海 Bill X.HU | 2007 | 工程勘察2007，35，3： | 5 |
| 7 | 运用STOMP数值模拟器进行多空介质中尿素水解以及方解石沉淀数值模拟(英文)显示文摘遍布于美国能源部所辖野外场地的地下放射性核素和痕量金属污染对美国能源部的长期监管职能提出了最严峻的挑战。目前较有前景的一个原地固化污染物方法是利用尿素酶催化尿素水解,进而推动方解石沉淀及与之共同沉淀。运用STOMP数值模拟器实施一系列反应性溶质数值模拟来研究系统中水流、运移、反应与反应导致的介质性质变化之间的紧密的非线性耦合,并在研究中系统性增加反应系统的复杂度和物理-化学的非均质性以考察模拟效果。通过调整反应速率表达式中尿素酶浓度和沉淀反应常数,对尿素水解和方解石沉淀速率进行了敏感度分析。结果显示:尿素水解速率是矿物沉淀总量的决定性因素,沉淀物的空间分布既取决于水解速率也取决于沉淀速率;在一维水流柱6个空隙体积的时间段模拟中,观察到了5%的最大空隙度减少;当二维模拟中考虑一个低渗透性包裹体时,被改变的流场重新对生成的沉淀组成物进行了分布,形成了扭曲的反应锋面。模拟结果也显示沉淀在低渗透性区域边界上形成,这说明位于这个区域里面的污染物可能被囊裹而从流线中被隔离起来。 | 郭娈靖 Bill X.Hu | 2010 | 地学前缘2010，，6： | 0 |
| 8 | The effects of hazardous working conditions on burnout in Macao nurses显示文摘Objective:To examine the effects of various hazardous factors in working environments on burnout in a cohort of clinical nurses in Macao.Methods:A cross-sectional survey was used to examine specific workplace hazards for burnout in qualified nurses(n=424)in Macao.Structural equation modeling(SEM)was used to analyze relationships between specific hazards and manifestations of burnout.Results:In the final model,workplace hazards accounted for 73%of the variance of burnout with a standardized regression weight of 0.85.The measures of the model fit were acceptable.Bodily hazards,threats of violence,and physical environmental hazards were found to significantly contribute to two major determinants of burnout,emotional exhaustion and depersonalization.Conclusions:Workplace environmental hazards increased the risk of burnout amongst clinical nurses in Macao.Better management of these factors may help to protect nursing staff and reduce the risk of burnout and attrition from the nursing profession. | Sydney X.Hu Andrew L.Luk Graeme D.Smith | 2015 | International Journal of Nursing Sciences2015，2，1： | 0 |
| 9 | Analysis of soluble chemical transfer from soil to surface runoff and incomplete mixing parameter identification显示文摘A two-layer mathematical model proposed by Tong et al.(2010) was used to predict soluble chemical transfer from soil into surface runoff with ponded water on the soil surface. Infiltration-related incomplete mixing parameter g and runoff-related incomplete mixing parameter a in the analytical solution of the Tong et al.(2010) model were assumed to be constant. In this study, different laboratory experimental data of soluble chemical concentration in surface runoff from initially unsaturated and saturated soils were used to identify the variables g and a based on the analytical solution of the model. The values of g and a without occurrence of surface runoff were constant and equal to their values at the moment when the surface runoff started. It was determined from the results that g decreases with the increase of the ponded water depth, and when the initial volumetric water content is closer to the saturated water content, there is less variation of parameter g after the occurrence of surface runoff. As infiltration increases, the soluble chemical concentration in surface runoff decreases. The values of parameter a range from0 to 1 for the fine loam and sand under the controlled infiltration conditions, while it can increase to a very large value, greater than 1, for the sand under the restrained infiltration conditions, and the analytical solution of the model is not valid for experimental soil without any infiltration if a is expected to be less than or equal to 1. The soluble chemical concentrations predicted from the model with variable incomplete mixing parameters g and a are more accurate than those from the model with constant γ and a values. | Ju-xiu Tong Jin-zhong Yang Bill X.Hu | 2015 | Water Science and Engineering2015，8，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员