黄土高原小流域雨水资源化潜力计算与评价初探

针对黄土高原地区水资源严重短缺的态势和生态环境建设的需要,以小流域为单元,以雨水资源为研究对象,在分析不同雨水利用形式的基础上,提出雨水资源化理论潜力、可实现潜力和现实潜力三种不同潜力,并探讨了小流域雨水资源化潜力的计算原理和办法,结合设立在黄土高原的11个国家攻关试验区小流域,初步提出雨水资源开发利用程度的评价办法。     

聚合氯化铝铁的混凝性能

通过聚合氯化铝铁 (PAFC)对不同 p H值原水的混凝实验结果的比较 ,得出原水 p H值不同时 ,发挥最佳混凝效果的 PAFC的 Al/ Fe摩尔比也不同。实验室制聚合氯化铝 (PA C)、聚合氯化铁 (PFC)、PAFC混凝实验结果表明 :p H 6 .5时 ,PAFC(Al/ Fe=5 / 5 ,B=1.5 )的混凝效果最好 ,p H>6 .5时 ,则 PA FC(Al/ Fe=9/ 1,B=2 .0 )的混凝效果最好。     

有反向压力粘性介质胀形铝、钛合金板实验研究

粘性介质压力成形是一种新发展起来的板金软模成形工艺,其对板料成形性能的影响可以通过胀形实验来检测和评价.文中采用一种具有应变速率敏感性的半固态粘性物质作为传力介质,采用胀形实验研究了在有、无施加反向压力的情况下,铝和钛合金板料的成形形状特征与应变分布.结果表明,粘性介质压力成形,尤其是存在反向压力时可提高板料的成形性能.     

高速公路用地复垦技术体系浅析

根据高速公路用地特点和复垦要求 ,结合近几年高速公路用地复垦研究成果和土地复垦技术理论 ,对高速公路用地复垦技术体系进行系统阐述和探讨。将对高速公路复垦技术理论和实践的发展有一定促进作用。     

县域生态功能区划研究——以桐柏县为例

结合桐柏县的实例，对县域生态功能区划分的原则和方法进行初步探讨。综合利用3S技术对县域生态敏感性和生态服务功能重要性的分析和评价，提出桐柏县生态服务功能区划的初步方案。将桐柏县划分为生态支持区，产品供给区，生态调节区。简要分析了各功能区在桐柏县经济可持续发展中的地位和作用，指出各区协调发展的方向和途征。     

甾烷作为溢油指示物的模糊聚类分析研究

用模糊聚类分析对溢油指示物甾烷进行了研究，为消除进样误差的影响，以标准化相对峰高为基本数据，推算出了油种及其甾烷的动态模糊聚类分析图。结果表明，油种的动态模糊聚类分析图可以显示油种间的疏近程度；甾烷的动态模糊聚类分析图可以表征溢油指示物各甾烷的贡献率，15个甾烷是模糊聚类分析的主要因子，属较理想的溢油指示物。     

Adsorption kinetics of methyl violet onto perlite

This study examines adsorption kinetics and activation parameters of methyl violet on perlite. The effect of process parameters like contact time, concentration of dye, temperature and pH on the extent of methyl violet adsorption from solution has been investigated. Results of the kinetic studies show that the adsorption reaction is first order with respect to dye solution concentration with activation energy of 13.2 kJ mol(-1). This low activation energy value indicates that the adsorption reaction is diffusion controlled. The activation parameters using Arrhenius and Eyring equations have been calculated. Adsorption increases with increase of variables such as contact time, initial dye concentration, temperature and pH.     

蔬菜中有机磷农药残留研究及对策

以西安市为例，研究了蔬菜中有机磷农药的残留问题，分析了不同农药在蔬菜中的残留特征以及不同品种蔬菜、不同类型蔬菜中农药残留的特征，讨论了蔬菜中农药残留量超标的原因及相关对策。     

Genetic variability in bloodworm (Glycera dibranchiata) populations in the Gulf of Maine

Genetic structure of eight Northwest Atlantic populations of the marine polychaeteGlycera dibranchiata Ehlers was examined with starch gel electrophoresis. Samples were collected during summer and fall 1981, and seven polymorphic and four monomorphic loci were consistently scored. Average heterozygosity (0.126) and percent polymorphic loci (59.3) were comparable to the averages reported for marine invertebrates. Minimum genetic distances between populations ranged from 0.003 to 0.093, levels typically associated with local populations of the same species in other taxa. Based on these data, inter- and intra-estuarine migration and gene flow appear to be low. Only two populations, separated by 13 km along the same river in New Brunswick, Canada, were not genetically different from each other. These findings may have relevance for management strategies in bloodworms.