萨拉乌苏动物组合对Heinrich事件的反映

萨拉乌苏动物组合包括下部的萨拉乌苏动物群和上部城川动物群,前者含有水牛和古菱齿象等化石,属于晚更新世中期,环境较为温凉湿润;后者以野驴和披毛犀为主,属于晚更新世晚期,代表较干冷的气候环境。综合两者的动物组合、测年结果及其生态特点,显示前者应该是末次冰期中期的温凉湿润环境,而后者则应为末次冰盛期的前夜,应该是另一次Heinrich事件H2的动物组合。     

工业废水的处理方法探讨

为实现水资源的循环利用与国民经济的可持续发展,必须对工业废水进行处理。在过去的几十年中,工业废水的任意排放给水资源环境和人民的身体健康带来了巨大的危害,为了杜绝这种现象的再次出现,本文对工业废水的处理方法做了如下的探讨。     

中心组合设计优化S-Cr-TiO2催化剂光降解工艺条件

在确定的温度和光照条件下,采用中心组合设计法研究了固相反应法合成的硫与铬共掺杂二氧化钛(S-Cr-TiO2)光催化剂与水溶苯胺蓝(ANB)可见光降解过程中的三个作用因子:催化剂的浓度、水溶苯胺蓝水溶液的pH值及其初始浓度之间的相互作用关系,得到了影响因子与降解速率之间的回归方程及因素之间相互作用的响应面图.结果表明,S...     

组合生态浮床对富营养化水体水质改善效果的研究

根据生态工程中的“食物链物质循环原理”和“生物强化理论”,对传统浮床进行改进,构建了集水生植物、水生动物及微生物于一体的新型组合生态浮床,并研究较低温度条件下对富营养化水体水质的改善效果.结果表明,日平均温度4～ 14℃,7d水力停留时间下,组合生态浮床对TN,TP,NHr-N,CODMn及Chl-a的平均去除率分别可达32.64％,63.90％,73.66％,17.70％和31.76％,较传统浮床的24.11％,54.53％,47.42％,7.13％和-3.11％,均有大幅度提高,可见,组合生态浮床在富营养化水体水质改善方面可发挥重要作用.     

Mutagenic and cytotoxic potential of Endosulfan and Lambda-cyhalothrin - In vitro study describing individual and combined effects of pesticides

Excessive use of pesticides poses increased risks to non target species including humans. In the developing countries, lack of proper awareness about the toxic potential of pesticides makes the farmer more vulnerable to pesticide linked toxicities, which could lead to diverse pathological conditions. The toxic potential of a pesticide could be determined by their ability to induce genetic mutations and cytotoxicity. Hence, determination of genetic mutation and cytotoxicity of each pesticide is unavoidable to legislate health and safety appraisal about pesticides. The objective of current investigation was to determine the genotoxic and cytotoxic potential of Endosulfan（EN） and Lambda-cyhalothrin（LC）; individually and in combination. 3-（4,5-Dimethylthiazol-2-yl）-2,5-Diphenyltetrazolium Bromide（MTT） assay was utilized to determine cytotoxicity, while two mutant histidine dependent Salmonella strains（TA98, TA100） were used to determine the mutagenicity of EN and LC.Moreover, mutagenicity assay was conducted with and without S9 to evaluate the effects of metabolic activation on mutagenicity. Even though a dose dependent increase in the number of revertant colonies was detected with EN against both bacterial strains, a highly significant（p 〈 0.05） increase in the mutagenicity was detected in TA98 with S9. In comparison, data obtained from LC revealed less mutagenic potential than EN. Surprisingly,the non-mutagenic individual-concentrations of EN and LC showed dose dependent mutagenicity when combined. Combination of EN and LC synergistically induced mutagenicity both in TA98 and TA100. MTT assay spotlighted comparable dose dependent cytotoxicity effects of both pesticides. Interestingly, the combination of EN and LC produced increased reversion and cytotoxicity at lower doses as compared to each pesticide, concluding that pesticide exposure even at sub-lethal doses can produce cytotoxicity and genetic mutations, which could lead to carcinogenicity.     

SBR-BAF组合工艺在肉鸡屠宰废水处理工程中的应用研究

屠宰废水有机污染物浓度较高,且含有脂肪、蛋白质等大分子有机物和毛发等杂物。采用前处理、SBR-BAF组合处理工艺在铁岭市某肉鸡屠宰企业废水处理工程的实际应用,取得了较为显著的效果。出水水质满足《辽宁省废水综合排放标准》(DB 21/1627-2008)直排标准和《肉类加工工业水污染物排放标准》(GB13457-92)[1]动植物油一级标准要求。组合处理工艺、设备运行安全可靠,可在同类肉鸡屠宰废水处理工程中推广应用。     

不同构造措施的钢管混凝土边框钢板剪力墙抗震性能试验研究

钢管混凝土边框钢板剪力墙是一种新型抗震剪力墙,为了比较不同构造措施对该新型剪力墙抗震性能的影响,进行了3个剪跨比为1.5的钢管混凝土边框钢板剪力墙低周反复荷载试验.其中,试验模型1为墙体钢板与边框柱钢管焊接,试验模型2为墙体钢板与边框柱钢管螺栓连接,试验模型3为墙体钢板开孔并与边框柱钢管焊接.通过试验研究,比较了各剪力...     

膜生物反应器及其组合工艺在有机废水处理中的应用

膜生物反应器是一种膜与生物反应器相结合的废水处理新工艺。介绍了膜生物反应器的种类，特性及其组合工艺。综述了国内外用于有机物废水处理过程中的研究进展及应用现状，并对其发展前景作出了展望。     

用子波组合模拟冲击环境

本文说明采用子波组合,在数控振动台上,模拟以冲击响应谱为试验条件的瞬态冲击环境的试验方法。