黄土高原主要农作物水分盈亏与雨养农业问题

黄土高原在气候上属亚湿润向半干旱的过渡地区。水分缺乏是农业生产的重要限制因素。本文围绕降水和蒸发,主要作物的需水和降水间的相互关系,农田干湿状况和水分盈亏额进行了分析讨论。认为,发展雨养农业应该是黄土高原农业生产的一条基本方针;在雨养农业作物的选择上,除谷子可以在全区种植外,其他作物受地区局限性很大;发挥雨养农业生产潜力的基本途径应该是增加土壤水分含量和提高土壤有效水分的利用系数,为达到这一目的宜采用平整土地、增施肥料等一系列农业措施。     

行为科学在我国企业安全管理中的研究应用现状及其发展趋势

从理论研究和实践应用两个方面综述了我国行为科学的理论和方法用于企业安全管理的现状,并从社会需要及学科发展的角度提出应进行“安全行为科学”的研究。     

碱渣对海洋水环境中PO_4~（3－）的吸附动力学特征

本文作为碱渣倾倒对海洋水环境影响现场调查的先期研究，从理论上推导了固─液体系的二级吸附动力学模型。在室内试验的基础上，利用该模型对碱渣─海水混合体系的吸附试验数据进行了理论分析。认为碱渣对海水中磷酸盐的吸附是二级动力学过程。并且提出了碱渣─海水体系中碱渣含量对吸附反应速率影响大小的“强度指数”概念。应用该模型预测了不同混合比例条件下碱渣对海水中不同初始浓度磷酸盐的平衡吸附量和平衡浓度。理论分析发现，预测的平衡吸附量和平衡浓度之间符合乔姆金等温吸附方程，说明了海水中磷酸盐在碱渣表面上的吸附是遮盖率不大的单层化学吸附，与本文的前提假设相符合。     

内蒙古正镶白旗火山杂岩基本特征及形成机制

正镶白旗火山杂岩为一不规则的穹丘状地质体,它是由渐变过渡的火山碎屑岩、流纹质碎斑熔岩和次火山岩构成的一个整体.可初步划分出三个近似同心环带.中环的流纹质碎斑熔岩是火山杂岩的主体,它的众多特征反映出初始岩浆含有较多的挥发分.岩浆在地下经过了较好的结晶分异,在地下——地上某个范围内存在隐爆——侵出区.火山作用是以小规模隐爆伴随缓慢的向上侵出为主.作用时间长,形成了规模较大的火山岩.正镶白旗火山杂岩属太平洋岩系钙碱质系列,原始岩浆由来源于上地幔和下地壳熔体的混熔作用形成.     

肿瘤与水污染综合生物效应关系及安全对策

介绍了肿瘤与水环境污染综合生物效应关系的研究现状，并提出了饮水安全环境对策和研究方向。     

长江口海域悬浮物的分布时空变化特征

本文以１９８６年冬季和夏季两个航次调查资料，研究了长江口吸其毗邻海域的枯丰水期的数百个海不悬浮物样品的成分和分布。悬浮颗粒物浓度变化范围，河口区，夏季为１３４．０－１８９．０ｍｇ’ｄｍ＾３，冬季为７１．６－２９９．０ｍｇ／ｄｍ＾３，而海区，冬季为６．９－１２．５display status     

A critical analysis of environmental evolutionin the loess-plateau area

Ａｃｒｉｔｉｃａｌａｎａｌｙｓｉｓｏｆｅｎｖｉｒｏｎｍｅｎｔａｌｅｖｏｌｕｔｉｏｎｉｎｔｈｅｌｏｅｓｓ－ｐｌａｔｅａｕａｒｅａＬｕＺｈｏｎｇｃｈｅｎ（ＲｅｓｅａｒｃｈＣｅｎｔｅｒｆｏｒＥｃｏ－ＥｎｖｉｒｏｎｍｅｎｔａｌＳｃｉｅｎｃｅｓ．Ｃｈｉｎｅｓｅ...     

A multi-hazard history of Antigua*

Antigua experiences earthquakes, droughts and hurricanes. To isolate for study each of these as they occur, would be to over simplify the inter-relationships between the aftereffects of one and the occurrence and the effects of the next. Moreover, there will be conditions arising from factors outside the natural disaster spectrum which bear upon, and are themselves affected by, all of these phenomena. This interplay of events and conditions is readily illustrated in the case of island countries, which have a natural and clearly defined containment. Such interrelationships suggest a complex human-ecological system which must be recognized if environmental balance and compatability are to be maintained - particularly in respect of hazards. This documentary analysis of the colonial era in Antigua, has to conclude for the time being with questions concerning the environmental effectiveness of imported systems of administration which, with no knowledge of comparable natural hazards, assumed sectoral separation.     

Cold-modeling study of a circulating fluidized-bed reactor for flue gas desulfurization (FGD)

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｔｈｅｃｏｏｌｓｉｄｅｓｏｒｂｅｎｔｉｎｊｅｃｔｉｏｎｄｅｓｕｌｆｕｒｉｚａｔｉｏｎ,ｐｏｗｄｅｒｅｄｌｉｍｅａｎｄｗａｔｅｒｓｐｒａｙａｒｅｉｎｊｅｃｔｅｄｉｎｔｏｔｈｅｆｌｕｅｇａｓｂｅｆｏｒｅｉｔｅｎｔｅｒｓｔｈｅｐ?..     

Fractal and multifractal approach to environmental pollution

A few case studies will be presented involving both radioactive and chemical pollution at small, medium, and large space-time scales. Reported are recent advances in the field of environmental pollution involving the use of fractals and multifractals. The mathematical tools proposed here may offer new perspectives for investigating many of the problems of nonlinear variability which commonly arise when dealing with pollutants, such as the presence of outliers and the sparseness of the sampling networks. They may also lead to a simplification of the models adopted for studying natural phenomena, thanks to a scaling approach. Finally, they may provide parameters whose values are directly related to the nonlinear dynamics involved in the pollutant distribution in the environment which, in turn, may be relevant for computer simulation and epidemiological or risk assessment purposes.