Study on NO2 gas sensing characteristics of In doped ZnO thin films prepared by RF magnetron sputtering

In doped ZnO thin films were prepared on glass substrate by RF magnetron sputtering. The result of XRD and AFM shows that the films are polycrystalline with high c axis orientation. The study of gas sensing reveals that the films are sensitive to NO2 and the best sensibility occurs at 273 ℃; the sensibility is concerned with the concentration of NO2 and the film thickness. The ZnO∶In films are more sensitive to the NO2 gas with higher concentration of NO2 and thinner films have a better sensitivity. Exposed to 2×10-5 NO2 at 273 ℃, the 90nm thick film has a sensibility of 16, indicating that ZnO∶In films can be used to measure NO2 with a low concentration.     

我国家具与室内装饰行业的现状与科技需求

概述了我国家具与室内装饰行业的发展现状,分析了行业的关键技术瓶颈;在此基础上,归纳并提出了我国家具与室内装饰行业"十二五"期间的科技需求.     

消息恢复型数字签名算法Rabin—PSS—MR安全性证明

采用Adversary和Simulator进行的合理交互,论证了"分解大整数N=pq是困难的(其中P,q为两个大素数),则Rabin-FSS-MR算法在自适应选择消息攻击下是安全的"的逆否命题,证明了Rebin-PSS-MR算法的安全性.     

清代华中地区干旱灾害时间特征及成因分析

基于清代(1644-1911年)华中地区干旱灾害历史资料的搜集与整理,利用启发式分割算法和互补集合经验模态函数等方法,分析华中地区干旱灾害的时间分布特征。结果表明:1)清代华中地区旱灾发生频繁,共208年次,占总年数的77.6%,其变化总体上呈下降趋势。2)华中地区旱灾于1694年发生突变,突变后旱灾频率明显减少。3)华中地区旱灾存在显著的周期性,存在2.6a、9.7a、21.6a、29.4a和102.1a的周期,其中9.7a和21.6a的周期与太阳黑子周期相一致。4)交叉小波分析表明太阳黑子数与华中地区旱灾变化在不同时间段内具有不同程度的相关关系。     

爱字当头,严格为先——浅议新形势下中职学校班级管理工作

当前,随着社会对技能人才和高素质劳动者的迫切需要,职业教育办学规模逐年扩大,学生数量增加。作为中职学校的班主任,应该从重塑学生的自信心,热爱每一个学生,爱字当头,严格为先,班级管理层次化几方面入手,做好班级管理工作。     

安康市农民外出务工现象浅析

安康市有大量的农民外出务工,本文就安康市农民外出务工的原因、特点及外出务工过程中存在的问题进行了研究分析,并针对存在的问题提出了如何解决的措施。     

Characterization of a Novel 1Ay Gene and Its Expression Protein in Triticum urartu

High molecular weight glutenin subunit （HMW-GS） plays an important role in determining dough property and breadmaking quality, and the exploration of novel genes for HMW-GS will be crucial for quality improvement program. A gene coding the y type HMW-GS at Glu-A1 locus in Triticum urartu （AA, 2n=2×= 14） with an electrophoretic mobility similar to that of 1Dyl2, was cloned, sequenced, and heterologously expressed. This novel active lay gene FJ404595 was confirmed by structure analyses of nucleotide and deduced amino acid sequences combining with phylogenetic analysis. The open reading frame （ORF） of this gene was 1 830 bp, encoded a protein of 608 amino acid residues containing 46 hexapeptides and 14 nonapeptides, which was mostly similar to the lAy gene AM183223 at a high identity of 99.62% with the two substitutions of both leucine/proline and valine/glutamate, obviously different from the lAy gene EU984504 with 587 residues containing 44 hexapeptides and 13 nonapeptides in T. urartu. The amino acid （leucine） at 446 differed from that （proline） of all the eight compared active lAy subunits. The predicted secondary protein structure implied that this lAy subunit might also have positive impact on flour processing quality.     

中国茎蜂科属种名录附澳洲茎蜂一新族(膜翅目:茎蜂科:澳洲茎蜂亚科)

简述了茎蜂科分类研究现状,建立一新族:澳洲茎蜂族(Australcephini n.trib.),列出了中国茎蜂科已知属种名录和文献沿革。