输变电项目环评存在问题分析及对策建议

列举了国家环保总局环境工程评估中心在输变电项目环境影响技术评估中遇到的一些技术和管理上亟待解决的问题,在对其分析的基础上,提出相应的对策建议.     

疲劳驾驶要不得

在交通事故中因疲劳开车的占很大的比例．尤其是大型运输车辆因驾驶人员疲劳开车而出事故的比例则更大。例如近日。在河南、广东路段连续发生两起大型气罐车和大型松香水车侧翻而出险的重大事故．就是因驾驶员长途疲劳驾驶所至的一个典型事例。疲劳驾驶是驾驶员们为了赶时间抓效益而不顾路途长远和自身的劳累“一脚到天涯”:其次是侥幸影响了安全。驾驶员们都认为自己的精力和能力没问题,长途或劳累一点驾驶不碍事;第三是散漫养成了习惯。由于我国一直没有关于禁止疲劳开车的有关规定．虽然《交通安全法》中规定了“或者过度疲     

某厂化学装置爆炸对设备房结构的损坏——调查与模拟分析

在对某厂化学爆炸所作的现场调查的基础上，对设备房钢筋混凝土框架结构构件的受损状况进行了分类描述，采用有限元方法对框架结构在静力和爆炸冲击荷载下的反应进行了模拟分析，分析结果与现场调查情况基本一致，给出了一些有意义的结论。     

拥挤人群疏散数学模型的研究现状探讨

文章简述了拥挤人群疏散数学模型研究的现状和已得到的一些结论,比较了目前几种研究方法优劣,提出了目前研究的不足。最后提出了作为拥挤人群疏散模型需要进一步研究的问题,如体系结构和突变条件等研究方向探讨。     

Contamination of Oxygen-Consuming Organics in the Yellow River of China

Contamination of oxygen-consuming organics (OCOs) was one of the most serious problems in the Yellow River of China. This study was conducted to analyze monitoring of the data on OCOs contamination for the river in 1980 and during 1992–1999 as well as examining the effect of suspended solids (SS) on chemical oxygen demand (COD_Mn) and biochemical oxygen demand (BOD₅) of river water. Several significant results have arisen from the study. First, COD_Mn and BOD₅ of the river water showed an increasing trend from the upper to the lower reaches of the mainstream. BOD₅ values of river water in 1992 were significantly higher than those in 1980 and showed an increasing trend during 1992–1999. Second, OCOs in river water of the mainstream was attributed mainly to point sources; the ratio of point to non-point sources of BOD₅ was about 2.81. The load from point sources showed an increasing trend during 1992–1998. In contrast, the load from non-point sources manifested a decreasing trend during this period; this was caused by the decreasing trend of SS content in river water. The total load of BOD₅ from point and non-point sources displayed an increasing trend during 1992–1998. Third, as the humic substances in SS can hardly be biologically oxidized in natural conditions but can be oxidized by chemical oxidants such as potassium permanganate, COD_Mn was not suitable for being regarded as a parameter reflecting the pollution degree of OCOs in river water with a high SS content.     

海星多糖对小鼠酒精性脂肪肝损伤的预防研究

以多棘海盘车体壁为材料提取海星多糖,探讨多糖对小鼠酒精肝损伤的预防作用。采用水提法提取多糖,硫酸—苯酚法进行测定。以正常小鼠作空白对照,将酒精肝小鼠分为酒精肝模型组,海星多糖低、中、高剂量组(20mg/kg、40mg/kg、80mg/kg)进行灌胃,测定小鼠生理指标。结果显示,与模型组相比,海星多糖组小鼠血清中ALT、AST含量降低(P<0.05),TG、MDA含量也降低(P<0.05),GSH-PX、SOD活性升高(P<0.05),肝脏脂肪变性明显减轻,说明海星多糖对酒精性肝脏有较明显的保护作用。     

合成词理据之探求——明通假,找本字

词的理据就是指词音表达词义的理由和根据.有些合成词中使用了通假字的借字而未用本字,使得词义无法理解,通过对通假字的探求来理清合成词的理据来源,从而准确理解其词义.参3.