溶剂热法实现ZnS晶体相变的反应条件研究

以去离子水和乙二胺作为溶剂,采用溶剂热法制备了ZnS晶体,探讨了反应时间、反应温度、溶剂配比等条件对ZnS晶体晶型转变的影响。采用X射线衍射仪、扫描电镜等手段进行了ZnS晶体物相结构及表征的分析。结果表明,通过简单调节反应参数可以实现ZnS晶体由立方闪锌矿到六方钎锌矿的相变;当反应时间大于10h,反应温度高于140℃,去离子水与乙二胺溶剂配比大于1的实验条件下所得样品为纯度较高的六方钎锌矿型ZnS;立方闪锌矿ZnS均为直径约3μm的单分散微球体,而六方钎锌矿ZnS是由许多纳米纤维缠绕而成的大小不一的球形颗粒。     

松北新区湿地细菌的筛选和鉴定

通过对哈尔滨市松北新区湿地中细菌的调查、筛选、鉴定,对湿地及湿地微生物之间的关系进行了简要的分析,为研究湿地生物多样性和合理利用等问题提供了科学依据．     

The Function and Development of Soybean Peptides

Soybean peptides are small molecules hydrolyzed soy protein, from three to six amino acid composition of the peptide mixture, inl000Da molecular weight below.Because it has a lot of good physical and chemical properties and physiological functions, in many areas has been widely used. This paper reviews the soybean peptide physical and chemical characteristics, physiological functions, technology and applications in the food industry.     

Vertical adaptive radiation in ocean Prochlorococcus: Evolutionary implications of the Chl b/a ratio from molecular evidence

Prochlorococcus is a marine cyanobacterium of global significance. Two ecotypes are adapted to either high-light (HL) or low-light (LL) conditions. The ratio between chlorophyll (Chl) a and b is a distinguishing characteristic of these two ecotypes. However, how this ratio evolved in Prochlorococcus during this ecotype differentiation remains unclear. Our analyses reveal that the ancestor of Prochlorococcus was typically low-light adapted. The LL ecotype showed a stagnant evolution, and the HL ecotype was recently diverged. There was an adaptive radiation after directional evolution in the Chl b/a ratio regulation. Recombination in chlorophyllide a oxygenase (CAO) and positive selection on Clp protease contributed to the directional evolution of Prochlorococcus. The recombinant fragments of CAO were correlated with a large group of shared coevolving sites. Evidence of positive selection was found in both subunits of Clp. Chl b/a ratio evolution, as annotated by molecular evidence, appears to be among the crucial reasons that explain how Prochlorococcus has become the dominant photosynthetic organism in the ocean.     

数字签名及其在Java中的实现

指出了数字签名正成为网络安全传输中的一种重要技术，介绍了数字签名技术的基本实现原理，对基于Java的数字签名技术进行了研究，并以Java小应用程序为例子，详细说明了在Java中使用Keytoo1和Po1icytoo1工具实现数字签名和认证的方法．     

浅析钢筋专业化加工与配送技术

介绍了钢筋专业化加工与配送技术的含义及其优势、目前面临的问题及发展的必然与前景。     

支持风险投资的政策体系和制度设计研究

风险投资产业的蓬勃发展,需要政府部门的大力支持和推进。首先对现有国内外支持风险投资的政策进行了分析和评价,进而探讨了促进风险投资的制度设计。通过整合一系列的资源要素,形成系统化的制度环境,我国未来的风险投资产业将能够获得长足的发展。     

一类广义半无限向量分式规划的最优性条件

利用局部渐近锥K,定义了（F,α,ρ,d）λ-V-伪凸函数、（F,α,ρ,d）λ-V-严格伪凸函数、（F,α,ρ,d）λ-V-拟凸函数、（F,α,ρ,d）λ-V-弱拟凸函数等几类广义凸函数,研究了涉及这些广义凸性的一类非光滑半无限向量分式规划的最优性条件．     

警用脉冲防暴水炮实验系统设计

基于现有实验设备,搭建了科学合理的脉冲防暴水炮试验系统,对其它水炮类装备的实验设计起到了指导作用。     

浅谈高等数学中的化归思想

化归思想贯穿于高等数学全部内容,是主要的数学思想方法,文章介绍了化归思想的含义。并阐述了化归思想在高等数学的应用及其在教学过程中如何渗透。