施肥处理对尾叶桉生长量和木材密度的影响

研究了不同施肥处理对６ ａ 生尾叶桉单株材积、年轮宽度、密度的影响规律,结果表明：从髓心向外,６ ａ 生尾叶桉年轮宽度呈逐渐减小趋势,基本密度呈逐渐上升趋势;施肥处理可以显著加快６ ａ 生尾叶桉的生长速度,提高尾叶桉的生长量;而造林当年施肥不仅加快尾叶桉当年的生长速度,对后期生长也有较好的促进作用;各施肥处理与对照材木片密度无显著差异。     

二溴对氯偶氮甲磺（DBCMSA）光度法测定铈组稀土的研究

研究了新显色剂二溴对氯偶氮甲磺与铈组稀土离子的显色反应。在盐酸、磷酸、高氯酸、 酸、硝酸介质中,与组稀土形成稳定的络合物,最大吸收在６４４ｎｍ。在测定钢样中铈组稀土总量时,反应有很高的选择性,不需加任何掩蔽剂,分析结果与标准值基本相符。     

深基坑事故隐患的灰色预测

从灰色系统理论的方法入手,针对已发生的时间序列的一组观测数据,直接建立用于对系统未来隐患进行预测的数学模型并进行预测。     

光电二极管暗电流温度特性的测量

介绍了一种光电二极管暗电流温度特性的测量系统,该系统采用了热电致冷器件和高精度的微电流计,非常适合测量一些小型光电器件的温度特性．还对测量数据进行了分析,所得结果对光电检测系统的设计也具有一定的参考价值     

WINNT无盘网络组建方法

该文着重阐述WINNT无盘网络体系结构及其工作站（dos方式入网及WIN95方式入网）配置文件的建立过程。     

海南岛尖峰岭保护区鱼类名录初报：———（包括海南岛一新记录的描述）

报道９种采自海南岛尖峰岭保护区（天池,海拔８２０ｍ）山间小溪流的小型淡水鱼类,其中圆尾斗鱼Ｍａｃｒｏｐｏｄｕｓｃｈｉｎｅｎｓｉｓ（Ｂｌｏｃｈ）在海南岛是首次报道,为海南岛新记录．     

直流偏磁场对三类硬磁畴畴壁长度的影响

在不同的直流偏磁场Ｈｂ下,测量了石榴石磁泡膜中三类硬磁畴长度（Ｌ）、宽度（Ｗ）和泡径（ｄ）．从而得到Ｌ、Ｗ和ｄ随Ｈｂ变化的曲线．结果表明,三类硬磁畴的畴壁长度都随Ｈｂ的增加而缩短．这些实验结果可为进一步的理论探讨提供实验依据     

The chemokine receptor CCR4 in vascular recognition by cutaneous but not intestinal memory T cells.

Lymphocytes that are responsible for regional (tissue-specific) immunity home from the blood to the intestines, inflamed skin or other sites through a multistep process involving recognition of vascular endothelial cells and extravasation. Chemoattractant cytokine molecules known as chemokines regulate this lymphocyte traffic, in part by triggering arrest (stopping) of lymphocytes rolling on endothelium. Here we show that many systemic memory T cells in blood carry the chemokine receptor CCR4 and therefore respond to its ligands, the chemokines TARC and MDC. These cells include essentially all skin-homing cells expressing the cutaneous lymphocyte antigen and a subset of other systemic memory lymphocytes; however, intestinal (alpha4beta7+) memory and naive T cells respond poorly. Immunohistochemistry reveals anti-TARC reactivity of venules and infiltration of many CCR4+ lymphocytes in chronically inflamed skin, but not in the gastrointestinal lamina propria. Moreover, TARC induces integrin-dependent adhesion of skin (but not intestinal) memory T cells to the cell-adhesion molecule ICAM-1, and causes their rapid arrest under physiological flow. Our results suggest that CCR4 and TARC are important in the recognition of skin vasculature by circulating T cells and in directing lymphocytes that are involved in systemic as opposed to intestinal immunity to their target tissues.     

异步电机的直接转矩控制及其数字仿真

本文根据直接转矩控制的原理构造了一种直接转矩控制系统,该系统在动态和稳态时采用不同的控制策略,使转矩、转速的快速性和控制精度得到满足。仿真结果证明了该方法的有效性。