Study on the supramolecular structure of sorbic acid intercalated Zn-Al layered double hydroxides and its thermal decomposition

A novel organic-inorganic composite, sorbic acid intercalated zinc aluminum layered double hydroxides （SA-ZnAl-LDHs） has been successfully assembled by a simple direct coprecipitation method. A holistic approach including normal XRD, FT-IR, and UV-Vis measurements and simultaneous TG/DTA/MS and in situ HT-XRD techniques was employed to explore the supramolecular intercalation structure and the thermal decomposition properties of as-syntheslzed SA-ZnAl-LDHs material.     

Apoptosis of Spodoptera litura larval hemocytes induced by heavy metal zinc

By adding different amount of zinc into the artificial medium of the insect larvae, the zinc-induced apoptosis of the larvae haemocytes of the herbivorous insect Spodoptera litura Fabricius was investigated with flow cytometer. The results showed that the increase of zinc dose in the artificial feed led to the accumulations of zinc in the larval hemolymph and fat body, and more zinc was accumulated in fat body than in hemolymph. The apoptosis of hemocytes was significantly induced at high zinc concentration （1000 mg·kg^-1） in the insect diet, and the apoptosis rate was 63.63%, which was remarkably higher than that at control and lower concentrations （50--500 mg·kg^-1）. This suggests that the high dose of zinc in the artificial diet of S. litura larvae could induce the apoptosis of the larval hemocytes of S. litura.     

Application of microfluidic chip to realize controllable pH gradient

A kind of PH gradient microfluidic chips through soft-lithography microfabrication for isoelectric focusing (IEF) and high performance liquid chromatography (HPLC) is introduced here. These pH gradient chips have the advantages such as easy fabrication, controllable pH range and precision, isoelectric focusing and separation at the same time, low voltage for isoelectric focusing, and time stable pH gradient. This method has potential application to sample preparation, separation and analysis of microfluidic chips.     

太原市污染物浓度时空分布特征及影响因子分析

对2003年太原市污染物浓度逐日数据和气象资料进行了分析，阐述了污染物浓度的时空变化和污染物浓度与气象条件的关系，为减轻和防止大气污染提供了参考。     

Build the First-class Plateau Railway in the World

The construction engineering of Qinghai-Tibet railway is fonnidahle but magnificent with very complicated geological conditions, facing “three difficult problems” of permafrost, severe coldness ＆ oxygen deficiency and fragile ecology. All of the working staff stick to human foremost principle, upgrade construction concept, realize the management innovation, implement the legal person responsibility system for construction project, form the management system featuring in the integration of quality-environment-occupational health ＆ safety, optimize project organization ＆ coordination s.vstem and establish the complete ＆ rigorous construction target system. Tackle the difficuhty of permafrost relying on science and technology and the finished roadbed, bridges and tunnels are in stable condition. Carry. out the basic national policies and protect geological environment, being the leading position in the construction of important and key construction projects and of demonstration significance. Insist on human foremost principle and guarantee the occupational health, creating the altitude medical miracle of “zero death of high-ahitude disease, zero occurring of SARS and zero spread of plague”. The construction also advances and implements “three specific requirements”, that is, the train passes the plateau in fast speed, high-reliable and less maintenance of operation equipment and minimum management staff of the line.     

论人类认知心理对商务语篇构建的影响

社会文化语境、心理认知模式对商务英语语篇构建有一定影响。社会文化语境对商务语篇构建的影响,表现为商务英语语篇具有平等性、灵活性和说服性等文化特征;而商务语篇中的正式辞令、指示性代词、委婉语等语言特征体现出交际者的认知心理模式。     

富营养化对水生生态系统的污染生态效应

针对富营养化的基本情况,探讨了富营养化的污染生态效应,包括它对水体水质的影响、对水生生物生理的影响、对水生生物群落结构的影响以及对水生生态系统功能的影响。     

"抢攻"对青少年篮球运动员意识培养的突出效能分析

运用访谈、数理统计、逻辑比较分析等方法,通过对青少年部分场次篮球比赛的技术统计,结合现代篮球竞技运动对运动员的高要求,指出了现代青少年篮球运动员训练的主导方向之一,突出的意识培养,为篮球运动员的训练提供建议和思考.     

γ-聚谷氨酸降解影响因素及其生物降解性能的研究

为开发制备低相对分子质量γ-聚谷氨酸的最佳方法，在不同温度、pH值条件下水解γ-聚谷氨酸，利用凝肢色谱法测定不同水解时间的相对分子质量，实验表明：高温和偏酸或偏碱环境均有利于γ-聚谷氨酸的降解，最优的降解条件为低pH的酸性环境下高温加热；采用TOC法研究γ-聚谷氨酸的生物降解性能，其10d降解率在30％以上，28 d降解率在70％以上，参照OECD 301标准，属于易生物降解高分子聚合物。     

模式匹配技术

模式匹配作为模式的基本操作已成为数据集成、数据仓库、电子商务等许多应用领域的基本问题。本文主要介绍关于模式匹配的定义、分类及已实现的几种通用化的模式匹配系统,指出了这些系统的优点及不足,并讨论了该领域未来的发展方向。