曝气生物滤池处理生活污水亚硝化的实验研究

为探究低氨氮生活污水亚硝化的可行性,采用高负荷生物滤池-上向流曝气生物滤池(UBAF)两段式反应器考察水流方向对高负荷生物滤池去除COD、氨氮效果及温度、DO对UBAF亚硝化效果的影响．结果表明,在水力负荷为0.58 m³／(m²·h)、COD容积负荷为2.30 kg／(m³·d)、气水比为3.6∶1、常温条件下,上向流进水方式能够获得稳定的低COD、高氨氮的二级出水．在水温30～33 ℃、DO 2.5～3.0 mg／L、进水pH 7.8～8.1条件下,UBAF出水氨氮平均转化率为84.58 ％,亚硝氮平均质量浓度达23.01 mg／L．UBAF反应器中各种含氮化合物沿程变化及FISH检测表明,在反应器末段存在一定程度的同步亚硝化厌氧氨氧化作用．该两段式反应器能驯化单独的脱碳、脱氮优势菌群,实现低氨氮生活污水的亚硝化．     

MMC系列单极式离子膜电解槽

为解决日本旭硝子公司AZM—F2电解槽在实际运行中出现的阴极部件易损、价高的问题，北京化工机械广研制开发可替代AZM—F2的国产单极式离子膜电解槽(MMC)。MMC系列单极式离子膜电解槽可与AZM—F2整体互换，活性阴极选用优质316L不锈钢，阴阳极采用对称结构，阴极导电面积是AZM—F2电解槽的4．3倍。MMC系列单极式离子膜电解槽投入运行后，电解槽运行平稳，槽电压等主要技术指标基本可达到AZM—F2型电解槽水平。     

外商直接投资对西安市经济增长的影响

1989年以来外商直接投资(FDI)对西安市的经济增长做出了极大的贡献。本文首先对外商直接投资与经济增长的关系进行了探讨,进而利用实证分析的方法分析了西安市的外商直接投资与经济增长的关系,最后通过计算要素的单位贡献率得出外商直接投资对经济增长的贡献从效率角度大大优于国内投资的结论。     

Treatment of Domestic Sewage by Two-Stage-Bio-Contact Oxidation Process

Effects of hydraulic retention time (HRT) and gas volume on efficiency of wastewater treatment are discussed based on a simulation experiment in which the domestic swage was treated by the two-stage-bio-contact oxidation process. The result shows that the average CODcr, BOD5 , suspended solid (SS), and ammonia-nitrogen removal rate are 94.5 %, 93.2 %, 91.7 % and 46.9 %, respectively, under the conditions of a total air/water ratio of 5 : 1 , an air/water ratio of 3:1 for oxidation tank 1 and 2:1for oxidation tank 2 and a hydraulic retention time of 1 h for each stage. This method is suitable for domestic sewage treatment of residential community and small towns as well.     

Review of Protecting Children from Domestic Violence: Strategies for Community Intervention.

Reviews the book Protecting children from domestic violence: Strategies for community intervention, edited by Peter J. Jaffe, Linda L. Baker, and Alison J. Cunningham (see record 2005-04430-000). The book emerged from the International Conference on Children Exposed to Domestic Violence that was held in London, Ontario in 2001. It begins with an excellent chapter by Jeffrey Edleson synthesizing the literature on the impact of exposure to domestic violence on children. Edleson's chapter is followed by two papers examining emerging assessments and treatment programs. The second section of the book addresses current thinking about individual and group intervention approaches. The third section of the book examines broader system level responses, including public awareness and school-based campaigns, as well as responses by the courts and police. This is a well-organized collection of papers that provides a good overview of the state of knowledge and innovative practice in an emerging field of practice. Protecting Children from Domestic Violence provides practitioners, policy makers, and researchers with an excellent overview of current knowledge and practices in working with children exposed to domestic violence. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The Relationship Between Witnessing Parental Conflict During Childhood and Later Psychological Adjustment Among University Students: Disentangling Confounding Risk Factors.

The purpose of the current study was to examine in detail the association between witnessing domestic violence (DV) and long-term psychological adjustment. Important limitations of past research were addressed, including controlling for several associated risk factors. Special attention was paid to whether the perpetrator of the violence was the maternal or paternal figure, as well as to whether the witness to the violence was male or female. Participants completed measures examining DV witnessed, direct child abuse experienced, and current psychopathology. Following screening for physical and sexual abuse, a sample of 351 individuals was selected. Four groups of participants were compared. Results indicated that individuals who had witnessed either physical DV or major psychological DV had higher levels of psychopathology than individuals who reported witnessing minor psychological DV or controls. After controlling for direct psychological abuse experienced, witnessing DV remained a significant predictor of psychopathology for males but not for females. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Do Dogs (Canis familiaris) Understand Invisible Displacement?

Domestic dogs (Canis familiaris) perform above chance on invisible displacement tasks despite showing few other signs of possessing the necessary representational abilities. Four experiments investigated how dogs find an object that has been hidden in 1 of 3 opaque boxes. Dogs passed the task under a variety of control conditions, but only if the device used to displace the object ended up adjacent to the target box after the displacement. These results suggest that the search behavior of dogs was guided by simple associative rules rather than mental representation of the object's past trajectory. In contrast, Experiment 5 found that on the same task, 18- and 24-month-old children showed no disparity between trials in which the displacement device was adjacent or nonadjacent to the target box. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

国产碳纤维上浆剂的比较

探索了不同类型国产上浆剂对碳纤维接触角、表面能、耐磨性、表面微观形态等物理特性的影响。结果表明:使用YJ上浆剂的碳纤维的硬挺度、耐磨性比使用FD、HIT的好,使用HIT上浆剂的碳纤维的外观、丝束幅宽比YJ的好。     

家政O2O发展现状分析

随着国内家政行业进阶为万亿级市场,家政业务交易额每年增幅都超过20％.家政O2O作为大众期望的一种运营模式,刚好能迎合这样快速发展的家政市场.首先介绍了国内家政服务市场的现状,然后分析了家政O2O的发展基础,最后以95081的家政O2O模式为例,分析了国内家政O2O的出路.     

国产顺酐酯化树脂催化剂工业化应用

筛选国产树脂，并与装置原进口树脂进行催化剂对比试验，结果表明：国产某型号树脂在顺酐酯化中的转化率、选择性和使用寿命方面均能满足工艺需求，部分指标优于装置原进口酯化催化剂。因此在装置酯化塔内逐步将进口树脂更换成国产树脂进行工业化试验，并不断改进和优化装置酯化塔的树脂装填方案，从而工业化应用国产树脂，降低装置生产成本，获得更好的经济效益。