线弹性有限元的自适应加密与多重网格法求解

基于Ｚｉｅｎｋｉｅｗｉｃｚ－Ｚｈｕ误差估计方法，自适应策略以及分子表结构，研制出功能强大的自适应多重网格有限元程序。该程序可对任意曲线组成的计算区域进行全局与局部加密。以应力集中问题为例，展示了自适应多重网格有限元的主要特征。研究结果表明：本文采用的误差枯计方法，自适应策略对线弹性问题的有效的，自适应多重网格有限元求解应力集中问题具有精度高，收敛速度快的优点。     

横向爆炸载荷下开孔弹性板的应力集中

基于ANSYS 7.0/LS-DYNA程序,对3 m×3 m四边简支、厚度为0.025 m、中心开有0.3 m×0.3 m方孔的弹性板,在下三角爆炸载荷作用下的应力响应进行了分析;利用能量密度时间分布函数(TDFED)确定了动应力集中因子,重点讨论了时间步长和采样时间间隔对计算结果的影响。     

全站仪线路纵、横断面测量

运用全站仪放样及对边测量功能，在已知控制点上设站，方便、快捷、精确的进行线路的纵、横断面测量。     

管流与环缝入流的管内合流特性──等温浓度场与紊流特性实验研究

在对管流与环缝入流的管内合流特性完成等温速度场实验研究的基础上，以对应一致的实验条件，实测了时均浓度分布，紊流正应力和紊流切应力分布．结果证明：浓度分布有与速度分布相一致的变化趋势和规律，但合流后截面上浓度均匀化比速度均匀化慢；合流动量相交产生附加雷诺应力，并决定合流后速度分布和浓度分布的均匀化进程．为建立系统的化学反应流动规律提供基础．     

能耗率极值原理和重力理论交互作用下粗质颗粒的浓度垂线分布

本文同时运用能耗率极值原理和重力理论研究了固液两相流在粗质颗粒时固相浓度的垂线分布,通过探讨能耗率极值原理对“非单向性”作用问题,进一步揭示了两相流运动的机理。计算结果与实测数据有较好的吻合。其研究方法、原理、步骤也极易推广到其它各种粒径的固相。     

Selective protection of cells against X-irradiation. Isoproterenol protects only those cells that possesβ-adrenoreceptors

Summary In mixed culture of Chinese hamster fibroblatst, clone 431, and transformed murine L fibroblasts, clone B-82, isoproterenol was found to protect only 431 cells against ionizing radiation. It was shown that 431 cells, in contrast to B-82 cells, possess-adrenoreceptors, and the radioprotective effect of isoproterenol can be realized only if this agent interacts with-adrenoreceptors coupled with the cAMP system. Since malignization often causes the disappearance of-adrenergic and other hormone receptors, the combined culturing and irradiation of the cells studied can be regarded as a model of the growth of malignant cells (B-82) among normal tissue cells (431 cells) under conditions of radiation therapy. A possibility of selective protection against radiation damage of normal tissue cells, with retention of the former radiosensitivity of tumor cells, is discussed.     

Energy flow and community structure in freshwater ecosystems

The goal of this article is twofold: 1) It aims at providing an overview on some major results obtained from energy flow studies in individuals, populations, and communities, and 2) it will also focus on major mechanisms explaining community structures. The basis for any biological community to survive and establish a certain population density is on the one hand energy fixation by primary producers together with adequate nutrient supply and the transfer of energy between trophic levels (bottom-up effect). On the other hand, predator pressures may strongly control prey population densities one or more trophic levels below (top-down effect). Other interpopulation effects include competition, chemical interactions and evolutionary genetic processes, which further interact and result in the specific structuring of any community with respect to species composition and population sizes.     

对数浓度图在氧化还原滴定分析中的应用

文中就对数浓度图在氧化还原滴定分析中的绘制及其应用进行了较为详细的讨论。     

烯烃的分子距离边数矢量(μ)及沸点的估计与预测

基于双键相对于单键键长的大小,提出了烯烃的分子距离边数（ＭＤＥ）矢量（μ矢量）;进而通过多元线性回归方法建立μ矢量与烯烃沸点之间的关系模型并进行预测,计算沸点与实验值之间的均方根误差仅为３．７８Ｋ,相关系数为０．９９９３。     

近炸引信炮口保险距离的计算

该文以国外某舰炮弹药无线电近炸引信为例,分析研究了该无线电近炸引信炮口安全保险距离有关的参量,通过对火药燃烧时间和电路延迟时间的计算推出了几种不同情况下该无线电近炸引信炮口保险距离,分析计算方法具有普遍性。