Structural study of sputtered nanocrystalline Ti and Zr by X-ray diffraction

Conclusion The structure of sputtered Ti and Zr deposited on substrate cooled by liquid nitrogen was investigated by X-ray diffraction technique. Results show that deposited Ti and Zr are composed of nanocrystalline particles, and the average grain sizes are respectively 7.2 and 6.3 nm. These nanocrystalline particles have different structures with common metal under the condition of room temperature and atmospheric pressure. The sputtered nanocrystalline Ti has b. c. c. structure, and the sputtered nanocrystalline Zr the ω-phase structure. Forming of the abnormal structure depends on the energy of sputtered particle and small grain size. The energy carried by sputtered particles could have met the kinetic requirement for forming of abnormal structure, while the nanometer grain size could make the abnormal structure have lower energy than normal structure.     

数码率低于10KbPS的双环自适应增量调制系统的研制

本文叙述一种双环自适应增量调制(TLADM)系统。它由一个内环和一个外环组成。内环是线性增量调制(LDM);外环是数字压扩增量调制(DCDM),具有量化阶自适应的功能。这种TLADM是专为移动通信研制的,具有数码率低、电路简单、单一电源、功耗低等特点。对所研制的系统进行了性能测试,在数码率为9.6KbPS时,对于400HZ正弦信号,最大的信号量化噪声比(SNR)_m是18.5dB,SNR>16dB的动态范围>25dB,800HZ正弦信号时的(SNR)_m是17.8dB,SNR>15dB的动态范围>20dB,平均单词可懂度为90％。数码率为8KbPS,400HZ正弦信号时的(SNR)_m为17.7dB,SNR>16dB的动态范围大于22dB,话音可懂。文中进行了理论分析,介绍了测试结果。     

Cloning and expression profiles of 15 genes encoding WRKY transcription factor in wheat (Triticum aestivem L.)

WRKY proteins are involved in various physiological processes, including biotic and abiotic stress responses, hormone responses and development. However, no systematic identification, expression and function analysis of WRKY genes in wheat were reported. In this study, we isolated 15 wheat cDNAs with complete open reading frame (ORF) encoding putative WRKY proteins using in silico cloning. Phylogenetic analysis indicated that the 15 wheat WRKY genes belonged to three major WRKY groups. Expression analysis revealed that most genes expressed drastically in leaf, except TaWRKY10 which expressed in crown intensively. Four genes were strongly up-regulated with the senescence of leaves. Eight genes were responsive to low temperature, high temperature, NaCl or PEG treatment. Moreover, differential expression patterns were also observed between wheat hybrid and its parents, and some genes were more responsive to PEG treatment in the hybrid. These results demonstrated that wheat WRKY genes are involved in leaf senescing and abiotic stresses. And the changed expression of these WRKY genes in hybrid might contribute to the heterosis by improving the stress tolerance in hybrids.     

浅谈小学校长教学管理

文章结合离石区第一小学发展所取得的成绩分析并讨论关于小学校长教学管理的问题。     

刍议高校教师激励机制体系的构建

从剖析现行激励机制存在的主要缺陷入手，分析了影响高校教师激励机制发展的因素，探讨了高校教师激励机制体系的构建对策。     

一类非线性弹性梁方程正解的单调迭代方法

对一类非线性四阶梁方程给出了正解的单调迭代格式.力学上,这类梁方程描述了两个端点被简单支撑的弹性粱的形变.利用相关线性方程的Green函数使这类方程转化为积分方程.根据相应积分算子的单调性构造了单调迭代格式.通过控制非线性项在有界集合上的"高度"证明了这个单调迭代格式的收敛性,主要工具是单调算子的迭代方法和全连续算子的锥压缩理论.这个迭代格式从零函数开始,因而是可行并且有效的.     

乙烯-乙烷分离吸附剂的研究进展

对吸附法分离乙烯的研究作了综述,分析了不同的乙烯吸附剂及其吸附性能.     

碳钢电子束表面合金化的组织与性能

本文用高能电子束对碳钢表面进行了不同粉末、不同预置方法的合金化处理，在组织性能分析基础上，得出了小型轧辊表面合金化的合适工艺，试验结果已用于生产。     

Fe(CN)_6~(3-/4-)在铂电极上氧化还原过程的表面拉曼光谱研究(英文)

本文运用共聚焦显微拉曼仪结合特殊的电极表面粗糙方法首次获得了Fe(CN)_6~(3-/4-)在铂电极表面氧化还原过程的拉曼光谱图。研究结果表明Fe(CN)_6~(3-)在电极表面的吸附能力比Fe(CN)~(4-)强,它们都是通过CN上的N原子和电极表面成键而发生化学吸附的。