广义可权集

引入广义可权集概念，讨论局部紧拓朴空间的子集特别是Ｋ－分析集与Ｂｏｒｅｌ集的广义可权性．     

水分对头孢唑林钠药效的影响初探

用平衡湿度法测定了头孢唑林钠的临界相对湿度，在２０℃时约为６７％。同时，通过破坏性实验考察了水分对其药效的影响，初步结果表明，水分每增加１％，效价降低约０．５％。据此，提出了分装操作的若干注意事项。     

防空导弹武器系统设计的系统工程方法

本文研究了防空导弹武器系统设计的系统工程方法。文中应用系统工程的原理和方法, 围绕武器系统设计的总目标──系统效能, 全面地分析了防空导弹武器系统的设计思想和方法。     

5-Fu和CHM对稀脉浮萍6746光周期诱导开花过程中过氧化物酶活性及同工酶的影响

5 Fu和CHM都强烈抑制稀脉浮萍6746开花,在SD诱导2天以内5 Fu完全抑制开花,以后抑制作用逐渐减弱;而在SD诱导4天以内CHM完全抑制开化.CHM明显抑制光周期诱导开花过程中过氧化物酶活性的增强和同工酶带的增多,而5 Fu则无此作用.     

衬底定向偏差角对非平面衬底液相外延的影响

在非平面衬底液相外延中,衬底的定向偏差角对外延生长有较大影响。为此我们对衬底定向偏差角对外延层形状及表面形貌的影响做了实验研究。 一、实验 1.对外延层形状的影响 我们在衬底定向和(100)面无偏差角(误差在±0.1°范围)及沿沟槽方向和(100)面有0.5°—1°的偏差角的衬底片上,进行液相外延生长四层结构。     

弹性钻柱两个特殊点的意义及计算方法

通过分析钻柱的应力和应变状态,对钻柱的中性点和零轴向力点给出了新的定义和计算方法,并阐述了稳定力和屈曲力(通称为虚轴向力)的概念。导出了处在垂直井眼中的复合钻柱的有关计算公式。文中还与原有的研究结论进行了对比分析,并提出了不同意见。本文以钻柱为研究对象,所得的结果可以推广应用到套管柱及油管柱上。     

A rice quantitative trait locus for salt tolerance encodes a sodium transporter

Many important agronomic traits in crop plants, including stress tolerance, are complex traits controlled by quantitative trait loci (QTLs). Isolation of these QTLs holds great promise to improve world agriculture but is a challenging task. We previously mapped a rice QTL, SKC1, that maintained K(+) homeostasis in the salt-tolerant variety under salt stress, consistent with the earlier finding that K(+) homeostasis is important in salt tolerance. To understand the molecular basis of this QTL, we isolated the SKC1 gene by map-based cloning and found that it encoded a member of HKT-type transporters. SKC1 is preferentially expressed in the parenchyma cells surrounding the xylem vessels. Voltage-clamp analysis showed that SKC1 protein functions as a Na(+)-selective transporter. Physiological analysis suggested that SKC1 is involved in regulating K(+)/Na(+) homeostasis under salt stress, providing a potential tool for improving salt tolerance in crops.     

Temperature dependence of surface enhanced Raman scattering on C<Subscript>70</Subscript>

The temperature dependence of surface enhanced Raman scattering of the C70 molecule is reported. The Raman scattering of C70 molecules adsorbed on the surface of a silver mirror was measured at different temperatures. The experimental results indicate that the relative intensities of the Raman features vary with the temperature of the sample. When the temperature decreases from room temperature to 0℃, the relative intensifies of certain Raman bands decrease abruptly. If we like the strongest band 1565cm^-1 as a standard value 100, the greatest decrease approaches to 43%. However, with the further decrease in the temperature these relative intensities increase and resume the value at room temperature. And such a temperature dependence is reversible. Our results show that the adsorption state of the C70 molecules on the silver surface around 0℃ changes greatly with the temperature, resulting in a decrease in relative intensities for some main Raman features of C70 molecule. When the temperature is lower than 0℃, the adsorption state changes continually and more slowly. Synchronously, eight new Raman features, which have not ever been reported in fiterature, are observed in our experiment and this enriches the basic information of the vibrational modes for C70 molecule.     

平面度误差检测中对角线布点的测量数据转换

本文对平面度误差检测中对角线布点的测量数据转换作了探讨,对实例进行了分析,并提出了减少测量误差的较为简便、实用的一种测量方法。     

单片机在弯管自动化生产线中的应用

本文重点介绍弯管自动化生产线单片机自动控制系统组成及软件实现方法。