北京市区公路旁尘土中铂族元素的化学形态

用ICP-MS 法检测北京市区公路旁尘土中铂、铑和钯各种形态的含量及总含量.结果表明,北京市区采样点公路旁土壤中铂,铑和钯的总量分别为154.23 ng·g-1,62.77 ng·g-1和 77.97 ng·g-1,其中非残留态的百分比含量为铑(37.82%) ＞钯(27.45%) ＞铂(26.87%);在自然条件作用下可进入地下水和可被植物吸收部分的百分比为铑(29.14%)＞钯(23.87%)＞＞铂(7.92%).     

Effects of prenatal yolk androgens on armaments and ornaments of the ring-necked pheasant

Mothers may profoundly affect offspring phenotype and performance by adjusting egg components, including steroid hormones. We studied the effects of elevated prenatal testosterone (T) exposure in the ring-necked pheasant on the expression of a suite of male and female traits, including perinatal response to stress, immune response, growth, and secondary sexual traits. Prenatal T levels were increased by injecting the yolk of unincubated eggs with physiological doses of the hormone. Yolk T injection resulted in a reduced length of male tarsal spurs, a trait which positively predicts male success in intra- and intersexual selection and viability, whereas no direct effect on male wattle characteristics or plumage traits of either sex was observed. Female spur length was also negatively affected by T, but to a lesser extent than in males. In addition, the covariation between male secondary sexual traits, which are reliable quality indicators, differed between T and control males, suggesting that the manipulation may have altered the assessment of overall male quality by other males and females. In conclusion, the negative effects of elevated yolk T on spur length, a trait which positively predicts male fitness, coupled with the lack of effects on growth or other traits in both sexes, provided limited evidence for mothers being subjected to a trade-off between positive and negative consequences of yolk T deposition on offspring traits and suggest that directional selection for reduced yolk T levels may occur in the ring-necked pheasant.     

电石遇潮湿空气易燃危险性的评估方法及预防措施研究

针对电石遇潮湿空气释放乙炔的危险特性,以潮湿空气与电石粉尘及电石粉尘堆垛表面接触的方式,替代传统的遇湿易燃危险性测试方法,拟合得到了乙炔气体释放速率随潮湿空气相对湿度变化的方程式,提出了将乙炔气体浓度控制在低于发生火灾爆炸危险区域的潮湿空气相对湿度和稀释乙炔气体浓度的氮气保护进气流量(Q)计算公式。结果表明:电石遇潮湿空气释放乙炔气体的浓度受温度和相对湿度的影响,根据不同温度条件下潮湿空气中水汽的分压(Ps)和乙炔气体的密度(ρ乙炔),可计算得到一定气相空间内电石遇潮湿空气释放乙炔气体的浓度;潮湿空气的相对湿度可以有效表征乙炔气体的释放量,用于评估在一定气相空间内电石遇潮湿空气释放乙炔气体发生火灾爆炸的可能性。     

餐饮废物综合利用的探讨

餐饮业残汤剩菜含有较高的脂肪、蛋白质 ,采取加热烘干工艺进行处理 ,做为饲料粗原料 ,然后进行精加工 ,不但解决了环境污染问题 ,同时为饲料原料开发寻找新的来源。餐饮业残汤剩菜的废油再生也可产生可观的经济效益及社会效益。     

悬浮水幕式除尘脱硫器的研究

介绍了悬浮水幕式除尘脱硫器的结构及工作原理，分析了影响除尘脱硫效果的因素，并提出相应的解决措施。试验及生产实践表明，该装置脱硫除尘效果均达到或超过国内外同类装置的水平，且该装置工艺流程简单、不存在堵塞问题。避免了二次污染     

粉煤灰的有效利用

介绍了我国粉煤灰利用状况及政策，结合实例分析了粉煤灰的有效利用和清洁生产对促进粉煤灰有效利用的作用。     

丁二酸钠对氯化钙和水玻璃溶液的渗透性影响

采用正向渗透试验方法测定了氯化钙和水玻璃溶液添加丁二酸钠后溶液在粉尘介质中的渗透规律。该研究结果可有效利用氯化钙和水玻璃进行固土抑尘。     

中小型水泥企业粉尘治理的几项措施

水泥生产的粉尘污染是一个重大的环保问题，特别是我区一些中、小型水泥生产企业，只从自身的利益因素考虑而对这一问题没有引起足够的重视。本文针对水泥生产的粉尘治理问题提出了一些经济、可行的措施，从而使其降低粉尘的排放量，达到环保要求。     

爆破法制浆工艺及其生产废水污染防治措施探讨

文章对麦草爆破法制浆生产工艺、原材料消耗、能耗、污染负荷等多方面进行论述,分析该工艺特点及其生产废水水质情况,并针对性的提出爆破法制浆生产废水污染防治措施。     

造气吹风气烟尘污染治理的技术措施

该文叙述了合成氨生产造气工段吹风气烟尘治理的技术措施与注意事项 ,指出在改进工况操作、减少吹风带出物的同时 ,设置干式旋风除尘与水膜除尘 ,可取得很好的治理效果 ,烟尘达标排放 ,经济效益显著