发展城市绿色流通的问题及对策研究

发展绿色流通是我国城市治理环境污染的新路径,也是一种既经济又高效的治污新举措。但目前发展城市绿色流通面临着诸多问题,需要树立绿色流通理念,实施绿色经营战略,强化流通企业责任,加快物流社会化建设,加大政府支持力度。     

郁金香之国的水经

荷兰的郁金香构成这个国家多彩的版图，而充沛清澄之水却滋润这个国家和它的国花的生命。     

环境大气监测的全程序质量控制

采用人工采样监测大气中的NO_X、SO_2、TSP,进行区域性调查、预测、评价及环境大气例行监测,探讨大气监测中监测现场的质量控制和实验室分析质量控制以及数据处理。     

1997年11月8日藏北玛尼7.5级大震的预报问题

对 1997年 11月 8日的藏北玛尼大地震 ,我们曾在 1991年进行过预报 ,1997年又曾重申过这个预报。本文用我们过去提出的预报理论和方法 ,对玛尼大震的预报问题再进行更广泛的讨论。文中 ,用立交模式讨论了玛尼大震的孕育机制 ,用 35°线上的 6 0a周期讨论了该震的发生年份 ,用构造交会及“静中动判据”讨论了该地震发生的地点 ,用磁暴倍九法和引潮力增长速度讨论了该震的发震日期 ,用科里奥利力效应讨论了该震余震震级偏小的原因 ,另外 ,还讨论了有关大震 -雪灾链的问题。     

阳离子艳红染料的光催化降解

本文研究了以沉淀法制备的TiO2为催化剂，紫外杀菌灯为光源，对阳离子艳红染料进行光催化降解的可行性，结果表明，在实验条件下，本系统对阳离子艳红染料有明显的降解效果，浓度为10mg/L的阳离子艳红染料经过30min的处理，其降解率＞88％，此外，还探讨了溶液初始pH值，催化剂的投加量，光照距离和液层高度等因素对光降解反应的影响。     

宁夏区域西夏建筑文化景观及其开发利用

蕴涵博大精深的党项族文化的西夏建筑景观表现出很高的艺术价值和独特的艺术风格，是西部难得的旅游资源。作者运用文化景观学的理论分析了宁夏区域西夏建筑文化景观，以及宁夏自然环境对西夏建筑文化景观的影响，同时指出人文社会环境与宁夏区域西夏建筑文化景观营造有更大意义。最后，作者认为宁夏区域西夏建筑文化景观的旅游开发，要在借助西夏学热，促进西夏建筑文化游的理论研究的基础上，积极展开区域协作，精心设计旅游线路，拓展旅游市场。     

Self‐efficacy changes in groups: effects of diversity,leadership, and group climate

Self‐efficacy belief is a significant predictor of behavioral choices in terms of goal setting, the amount of effort devoted to a particular task, and actual performance. This study conceives of formation and change of self‐efficacy as a social and context‐dependent process. We hypothesized that different group factors (discretionary and ambient group stimuli) influence changes in members' self‐efficacy through differing routes (individual‐level and cross‐level processes). We tested our hypotheses using data from individuals in 169 training groups who attended a 5‐day workshop designed to increase participants' job‐search skills and efficacy. Specifically, we examined the degree of change in participants' job‐search efficacy before and after the workshop. The results showed that (a) membership diversity in education was positively related to increases in job‐search efficacy, (b) supportive leadership contributed to job‐search efficacy at the individual level of analysis with no cross‐level effects, and (c) open group climate contributed to job‐search efficacy through both individual‐level and cross‐level processes. Limitations and directions for future research are discussed. Copyright © 2003 John Wiley & Sons, Ltd.     

GIS BASED LONG TERM HYDROLOGIC IMPACT EVALUATION FOR WATERSHED URBANIZATION1

ABSTRACT: To adequately manage impacts of ongoing or future land use changes in a watershed, the magnitude of their hydrologic impacts needs to be assessed. A grid based daily streamflow model was calibrated with two years of observed streamflow data, using time periods when land use data are available and verified by comparison of model predictions with observed streamflow data. Streamflow data were separated into direct runoff and baseflow to estimate the impacts of urbanization on each hydrologic component. Analysis of the ratio between direct runoff and total runoff from 30 years of simulation results and the change in these ratios with urbanization shows that estimated annual direct runoff increased from 49.2 percent (1973) to 63.1 percent (1984) and 65.0 percent (1991), indicating the effects of urbanization are greater on direct runoff than on total runoff. The direct runoff ratio also varies with annual rainfall, with dry year ratios larger than those for wet years. This suggests that the impact of urbanization on areas that are sensitive to runoff ratios, such as stream ecosystems, might be more serious during drier years than in wetter years in terms of water quality and water yield. This indicates that sustainable base‐flow is important to maintaining sound stream ecosystems.     

辐射化学在环境激素研究中的应用

环境激素对地球生态系统带来严重威胁.大量难降解环境激素(如多氯联苯、二噁英)危害全球脆弱的生态环境,其直接后果之一就是人类乳腺癌等恶性疾病发病率急剧上升.因此,当今世界各国均十分重视环境激素的环境生物学机理研究.辐射化学作为一门高新技术,在环境激素污染物处理、降解机理与生命科学研究等方面可发挥重要作用,例如:同步辐射可用于直接观测溶液口的雌激素受体ER真实结构,脉冲辐解、激光光解和电子自旋共振用于研究环境激素活性瞬态粒子动力学等等.     

模糊综合评判法在煤炭自燃预测中的应用

运用模糊综合评判法预测煤炭自燃。在分析煤炭自燃影响因素的基础上，从煤体的氧化放热性能、供氧条件和煤体蓄放热环境三方面确定了模糊综合证券的因素指标，提出了确定评判指标属性值和权重值的方法，并将模糊综合评判法成功应用于矿山煤炭自燃的预测。