不同埋管形式的预制能量管桩热响应试验研究

能量桩是通过在传统桩基础内安装换热管的新型节能减排技术。通过在PHC桩芯内埋设换热管形成预制能量管桩。现场采用单U和双U热响应试验,利用分布式光纤传感技术,对桩身的温度和应变分布进行了监测,得到了试验过程中能量桩的温度和应变变化规律;发现换热初期热量会堆积在能量桩内无法快速传递到桩外,整个过程桩体升温幅度不大,热量传递效率较低;揭示了预制能量管桩的热、力学变化特征,为预制能量管桩的优化设计和换热能力的评价提供了依据。     

Biology and mating behavior of Xylocopa virginica L. (Hymenoptera,Anthophoridae)

Summary The biology and behavior of Xylocopa virginica L. were followed in the area of Athens, Georgia (USA) from August 1973 until September 1974. Several nests were X-rayed regularly during the developmental period of the bees, and information about the life cycle and development was obtained. The bees emerge in June and stay in their nests with their sibs throughout the summer, fall, and winter, leaving only occasionally on warm days to search for nectar as food. In March and April males defend nest-side territories and mate with most females. The males die in the late spring and the females dig nests, provision them, and rear up to 8 or 9 bees in each nest. Many females live 2 years, and often 2 to 3 females are present in each nest, but only 1 works and lays eggs. Emergence of adults from pupae is nearly synchronized, irrespective of age.     

重庆市可持续发展状况分析

构建重庆市可持续发展指标体系,运用层次分析法对重庆市的可持续发展状况进行了评价.通过评价结果分析发现,重庆市在2001年前可持续发展保持较好,而2001年以后经济虽然发展较快,但环境和资源的承载能力下降,可持续发展表现出不和谐.最后就重庆市的可持续发展提出了建议和措施.     

Transformational leadership and emotional intelligence: a potential pathway for an increased understanding of interpersonal influence

Non‐cognitive emotional intelligence could potentially contribute to a more holistic understanding of interpersonal influence and leadership; however, significant issues of definition, psychometric independence, and measurement must be conclusively resolved. Possible relationships between emotional intelligence, transformational leadership, and individual/organizational outcomes are described and further investigation is encouraged. Copyright © 2005 John Wiley & Sons, Ltd.     

生物膜填料塔启动及烟气脱硫研究

进行了生物膜填料塔挂膜启动及烟气脱硫实验研究。循环液的Fe2+的氧化速率与吸光度有明显的相关性,同时,压力损失和pH也是挂膜启动完成的重要指标。通入低浓度SO2气体驯化后,脱硫率可达到90%以上,Fe2+氧化速率维持在0.2g/(L.h)左右,连续保持7d,挂膜启动完成。脱硫实验结果表明,在SO2入口质量浓度小于2 000m g/m3、喷淋液中Fe2+浓度大于或等于0.06m o l/L、喷淋率约为12L/(m3.h)、空塔气速约为0.15m/s的条件下,脱硫率可达96%以上。当喷淋液循环使用7次后,必须补充新鲜营养液,以保证较高的脱硫率。     

Improving decision quality: Making the case for adopting next‐generation site characterization practices

Better site characterization is critical for cheaper, faster, and more effective cleanup. This fact is especially true as cleanup decisions increasingly include site redevelopment and reuse considerations. However, established attitudes about what constitutes “data quality” create many barriers to exciting new tools capable of achieving better characterization, slowing their dissemination into the mainstream. Traditional approaches to environmental “data quality” rest on simplifying assumptions that are rarely acknowledged by the environmental community. Data quality assessments focus on the quality of the analysis, while seldom asking what impact matrix heterogeneity has had on analytical results. Assessments of data quality typically assume that chemical contaminants are distributed nearly homogeneously throughout environmental matrices and that contaminant‐matrix interactions are well behaved during analysis. Yet, these assumptions seldom hold true for real‐world matrices and contaminants at scales relevant to accurate risk assessment and efficient remedial design. For the site cleanup industry to continue technical advancement, over‐simplified paradigms must give way to next‐generation models that are built on current scientific understanding. If reuse programs such as Brownfields are to thrive, the scientific defensibility of individual projects must be maintained at the same time as characterization and cleanup costs are lowered. The U.S. Environmental Protection Agency (EPA) offers the Triad Approach as an alternative paradigm to foster highly defensible, yet extremely cost‐effective reuse decisions. © 2003 Wiley Periodicals, Inc.     

准好氧填埋早期渗滤液特征浅析

本文基于室内垃圾模拟柱试验，分析了准好氧填埋早期垃圾渗滤液的产生过程及垃圾降解的机理，得出了启动期内垃圾渗滤液产量的变化趋势，总结出准好氧结构的部分优点，并针对早期准好氧渗滤液产量的特点作了相应的讨论。     

NITROGEN AND PHOSPHORUS CONCENTRATIONS IN FOREST STREAMS OF THE UNITED STATES1

ABSTRACT: Seventy to eighty percent of the water flowing in rivers in the United States originates as precipitation in forests. This project developed a synoptic picture of the patterns in water chemistry for over 300 streams in small, forested watersheds across the United States. Nitrate (NO₃^?) concentrations averaged 0.31 mg N/L, with some streams averaging ten times this level. Nitrate concentrations tended to be higher in the northeastern United States in watersheds dominated by hardwood forests (especially hardwoods other than oaks) and in recently harvested watersheds. Concentrations of dissolved organic N (mean 0.32 mg N/L) were similar to those of NO₃～, whereas ammonium (NH₄⁺) concentrations were much lower (mean 0.05 mg N/L). Nitrate dominated the N loads of streams draining hardwood forests, whereas dissolved organic N dominated the streams in coniferous forests. Concentrations of inorganic phosphate were typically much lower (mean 12 mg P/L) than dissolved organic phosphate (mean 84 mg P/L). The frequencies of chemical concentrations in streams in small, forested watersheds showed more streams with higher NO₃^? concentrations than the streams used in national monitoring programs of larger, mostly forested watersheds. At a local scale, no trend in nitrate concentration with stream order or basin size was consistent across studies.     

医疗垃圾焚烧飞灰中重金属浸出的影响因素

以四川某城市为例,对医疗垃圾焚烧飞灰进行了重金属的浸出特性实验,探讨了不同液固比、初始pH值及浸取剂对飞灰中重金属Cu、Zn、Pb、Cd、Ni的浸出影响.结果表明,重金属的浸出率随着液固比的增加而增加;重金属在酸性条件下较易浸出,而在碱性条件下渗滤较少;不同的浸取剂对重金属的浸出也有一定影响.     

Excel在灰色关联分析中的应用

介绍了灰色关联分析的一般步骤,并对其中分辨率的取值和权重的计算作了初步分析.在此基础上,通过将灰色关联分析方法编写成Excel VBA程序,并应用于铜锣山隧道出口端隧道水的来源识别,不仅在较大程度上简化了计算,而且也取得了良好的预期成果.