Effect of particle size distribution on the microstructure,texture,and mechanical properties of Al–Mg–Si–Cu alloy

The effect of particle size distribution on the microstructure,texture,and mechanical properties of Al–Mg–Si–Cu alloy was investigated on the basis of the mechanical properties,microstructure,and texture of the alloy.The results show that the particle size distribution influences the microstructure and the final mechanical properties but only slightly influences the recrystallization texture.After the pre-aging treatment and natural aging treatment(T4 P treatment),in contrast to the sheet with a uniform particle size distribution,the sheet with a bimodal particle size distribution of large constituent particles and small dispersoids exhibits higher strength and a somewhat lower plastic strain ratio(r) and strain hardening exponent(n).After solution treatment,the sheet with a bimodal particle size distribution of large constituent particles and small dispersoids possesses a finer and slightly elongated grain structure compared with the sheet with a uniform particle size distribution.Additionally,they possess almost identical weak recrystallization textures,and their textures are dominated by CubeND {001}310 and P {011}122 orientations.     

Study on Technologies of Hydrogen Production and Hydrogen Power System Based on Renewable Energy

Integrating the hydrogen production technologies from renewable energy with the advanced distributed hydrogen power systems has being become an important development trend of energy science and technology in the twenty-first century, since it may satisfactorily solve such problems met in the utilization of renewable energy as low density, instability, discontinuity and changing with time, season and climate. In this paper, the status and prospect of studies on hydrogen production theories and technologies from renewable energy especially the photocatalytic water splitting and the thermochemical catalytic gasification of biomass in supercritical water are commented on, and some new suggestions to build up novel hydrogen energy power system based on renewable energy are put forward.     

复合材料层合板粘弹性本构方程

本文从连续介质力学角度，用宏观唯象理论，给出了复合材料层合结构变温下的线性粘弹性本构方程的一般形式，并将本构方程在时间域上离散，采用线性拉格朗日插值函数，导出积分型本构方程的递推公式，便于实际工程问题求解。     

Collection points to the high pier variable cross-section solid rectangular pier sliding form construction technique

文章介绍了两面收分高桥墩滑模模板的设计和施工,对变截面高桥墩混凝土施工有一定的参考价值.     

基于混合投影峰分析的人眼定位方法

利用灰度投影曲线检测预处理后的人脸图像眉眼区域,并分割左右眼区域;结合梯度投影和方差投影函数构造区域混合投影函数,分别对左右眼区域进行混合投影;分析一系列的投影峰,筛选后得到眼睛中心的准确位置.在ORL和BioID人脸库上的实验表明：在姿态和光照变化较大及佩戴眼镜的情况下,利用混合投影函数峰分析定位眼睛的结果优于单个投影曲线.     

由我国的转基因技术研究引发的思考

文章通过对中国转基因技术的发展及其产业化状况的分析,提出在21世纪机遇与挑战并存的新一轮科技竞争中,我国基因技术产业发展的必由之路。希望以此为基点,把对转基因技术的研究真正落实到可操作层面。     

图形文件几何参数的抽取技术

阐述了从图形文件抽取几何参数的技术，即把复杂的内部图形文件转换成外部可读的通用文件．通过对通用文件的结构分析，找出其内在的规律，然后用高级语言进行抽取和加工，将用户所需的几何参数写人数据文件，提供给用户读写，从而达到对图形数据管理的目标．     

从文献计量指标评价高等医药院校学报的学术影响力

通过对入选《中国科技期刊引证报告》的51种高等医药院校学报若干项文献计量指标的归纳和分析，对各校的办刊质量和期刊的学术水平及其在国内学科领域的学术影响力和学科地位进行了综合的评价和评估。     

Ni掺杂中孔TiO2的合成及其光催化分解水性能研究

合成了Ni掺杂中孔TiO2光催化剂，其吸收光谱阈值红移至500nm，500℃焙烧后依然保持中孔结构．喇曼光谱证实，这种催化剂具有锐钛矿晶型．在Na2S／Na2SO3复合牺牲剂体系下，对Ni掺杂中孔TiO2和Ni掺杂颗粒TiO2两种催化剂的产氢活性进行了考察，发现前者比后者提高了近1倍。     

新疆与东部发达省区、中部地区新型工业化进程中相关分析与预测比较

本文就新疆新型工业化进程及发展水平的预测,运用数理模型进行了典型抽样计算分析评价,以便全面了解和认识新疆与全国及东部地区在工业化进程的发展差距,有益于新疆新型工业化战略实施中政府政策的争取热战略选择,同时,为政府在新型工业化进程中的阶段战略规划预期目标确定提供参考依据。