受控源作用分析

受控源作用分析程道林１房建州２（１徐州师范大学物理系,徐州,２２１００９;２徐州教育学院物理系,徐州,２２１００６）独立源作为电路的输入,代表着外界对电路的作用,在电路中起激励的作用．而受控源则不同于独立源,其电压或电流不是定值,也不是给定的时间函数...     

正交设计法在白三叶组织培养中的应用

以白三叶的叶片为外植体,采用正交设计法,对愈伤组织生长和细胞悬浮培养的培养基进行了优化筛选。实验结果表明,白三叶叶片愈伤组织生长的最佳培养基配方为ＭＢ＋０．５ｍｇ／Ｌ ２,４－Ｄ＋０．２ｍｇ／Ｌ ＮＡＡ＋１ｍｇ／Ｌ ＢＡ＋２ｍｇ／Ｌ甘氨酸＋１００ｍｇ／Ｌ肌醇＋３％蔗糖＋０．７％琼脂;细胞悬浮培养的最佳培养基的配方为ＭＢ＋４ｍｇ／Ｌ ２,４－Ｄ＋０．２ｍｇ／Ｌ ＮＡＡ＋０．５ｍｇ／Ｌ ＢＡ＋２ｍｇ／     

气垫调压室的体型优化计算

以总容积最小为目标,建立了气垫调压室体型优化的数学模型,采用遗传算法求解该模型,从而为合理选择调压室截面积、气室高度、室内水体高度及初始气体压力等基本参数提供了科学依据．给出了计算实例,所得结果与经验估算值相比,工程效益较为显著,设计安全度高．     

用户中继热线自动接续系统

提出以单片机为核心构成自动接续装置,检测程控交换机中继线路的直流状态和交流信号音,实现“热线电话”中继线路的自动接续．     

红三叶和白三叶愈伤组织的诱导和胚性细胞悬浮系的建立

以红三叶（Ｔｒｉｆｏｌｉｕｍｐｒａｔｅｎｓｅ）野生品种巴东红三叶的叶片为外植体,在ＭＢ－１至ＭＢ－９的固体培养基上诱导愈伤组织,筛选出最佳培养基是ＭＢ－９培养基．以白三叶（Ｔｒｉｆｏｌｉｕｍｒｅｐｅｎｓｅ）裁培品种“路易斯安娜”和“Ｈｕｃａ”的叶片为外植体,接种在ＭＢ－９固体培养基上诱导愈伤组织．愈伤组织形成以后,均在ＭＢ－９固体培养上继代培养３～４次后,获得胚性愈伤组织,然后转至ＭＢ＋３ｍｇ／Ｌ２,４－Ｄ＋０７ｍｇ／ＬＢＡ＋０２ｍｇ／ＬＮＡＡ＋２ｍｇ／Ｌ甘氨酸＋５００ｍｇ／ＬＣＨ＋３％蔗糖的液体培养基中,经强化培养,２个月后,获得胚性细胞悬浮系．实验结果表明,缩短换液时间,即每隔３～４ｄ换一次,可加快胚性细胞悬浮系的建立．     

Effects of atmospheric pollution on human health

Most air pollutants do not lead to specific diseases. Depending on the pollutant, the concentration and the duration of exposure, some organs are more affected than others. The most frequent disorders are those caused by irritant gases and particulates on the mucous membranes and respiratory organs. The consequences are eye, nose and throat inflammations, diminished lung function, increased susceptability to respiratory infection and a higher incidence of chronic bronchitis. These disorders and diseases are, of course, influenced by other factors as well, such as immune deficiency, allergies, occupational exposure to pollutants, and particularly smoking. The effects of air pollutants are, therefore, multifactorially conditioned and nonspecific disorders are placed in the foreground. Evidence for an association of air pollution with adverse effects on human health is drawn from three sources: animal experiments, experimental human exposures, and epidemiologic studies of exposed human populations. The burden of atmospheric pollution must be reduced to protect human health by an adequate safety margin. In particular, the increased sensitivity of sick and aged people as well as children should be taken into account. In defining the maximum emmission levels, preventive aspects should have priority so as to keep the risk of damage to health and the harmful influences on the environment to a minimum.This article Effects of atmospheric pollution on human health by H. U. Wanner is a revised version of the same article that was first published in the Proceedings of the 1990 European Aerosol Conference; special issue of the J. Aerosol Sci., Vol. 21, Suppl. 1 (1990) 389–396.Reprinted with kind permission from Pergamon Press Ltd, Headington Hill Hall, Oxford OX3 0BW, Great Britain.     

加工误差对气体静压径向轴承的影响

建立了一种考虑影响气膜厚度误差、圆度和圆柱度误差的气膜厚度分布综合表达式,考虑加工误差对气体静压径向轴承的影响,进行了气体润滑有限元分析.分析表明:圆度和圆柱度误差对轴承的承载能力影响不大;气膜厚度误差为平均气膜厚度的5%时,承载能力变化约为10%.     

机动车多点源排放空气污染物浓度解析模式

针对公路机动车排放源和环境特点，建立了风速和扩散系数随高度变化的公路机动车多源排放空气污染平流扩散方程。提出了在地面和对流层边界对污染物为全反射条件下的定解问题。引用Green函数的概念，提出了公路机动车多源扩散方程的求解思路，利用微分方程的特征理论，求得了Green函数的横风和垂直向分量。通过Green函数分量与排放源强的线性组合，得到了公路机动车排放为多点源、线源和面源时污染物浓度三维分布的解析解。指出了广泛使用的高斯扩散模式在公路机动车排气污染物浓度计算中的局限性。     

基于广义逆的受控机构优化

基于受控原动件的机械特性和受控机构二自由度的特点，建立精确实现多点轨迹受控机构的圆拟合优化模型．提出运用广义逆求解补偿运动位移的方法。     

汽车半主动悬架系统的关键技术及研究进展

基于系统分析理论，论述了汽车半主动悬架系统的发展与研究进展，提出了系统信号检测与传感器、磁流变液体及其器件设计、控制策略与控制器等关键部件的研究与开发过程中的相关基础问题，分析了系统动力学建模与仿真、系统信息分类与控制、系统集成与试验等系统应用研究的相关技术问题．并结合课题组研究进展，提出了汽车半主动悬架系统物理层构成．