计算机机房的管理和维护

概述了计算机机房的发展状况及前景,提出目前计算机机房管理中存在的问题,并从管理制度、环境和设备及系统方面提出相应的解决办法和建议。     

压性雁列构造变形过程中热场演化的实验研究

在实验室利用铂电阻接触测温系统和红外热像仪两种仪器,观测了含压性雁列断层结构的岩石标本在变形过程中的温度分布．两种方法的测量结果都显示了热场在时间上和空间上与应力、应变场的关系．实验显示,在岩石标本的不同构造部位的增温速率不同,反映了不同部位的应力分布不同．实验过程中标本变形可分3个阶段:弹性阶段、粘滑阶段、以及破裂阶段．温度变化过程也分为3个阶段,各阶段的温度上升速率不同,热辐射场也发生了相应的变化,反映了不同阶段的主导增温机制发生了改变．实验结果对利用卫星热红外波段资料研究断层现今活动提供了物理依据．     

Structures of Silk Fibers Grafted with Hexafluorobutyl Methacrylate

The relationship between the graft yield and the effect of hexafiuorobutyl methacrylate graft treatment on the structural changes of the silk fibers was studied on the basis of the results of scanning electron micrograph photographs （SEM）, infrared spectroscopy （IR）, Raman spectrum, wide-angle X-ray diffraction patterns （WAXD）, nuclear magnetic resonance（NMR） and amion acid analysis. The results showed that the crystalline regions of grafted fibers were hardly affected and the fiber fission occurred on the cross sections of grafted fibers. The surface of fibers was covered with a high polymer film. The Raman spectrum showed there was little change in the conformation of grafted fibers which mainly remained β-sheet conformation. The IR of the grafted silk fibers showed new absorption of bands occurred which belonged to the stretching-vibrationabsorption-peak bands of Vo-o and VC-F of aliphatic ester species. The CF3-, -CF2- and -CFH- grafted silk macromodecul were verified in the NMR spectrum. The amion acid analysis indicated fluoride monomers were inclined to graft with TYR, ARG and CLU silk fibers.     

Biosynthesis Pathway Related Production of Medium Chain Length Polyhydroxyalkanoates

IntroductionPolyhydroxyalkanoates,abbreviated as PHA,is afamily of intracellular biopolymers synthesized bymany bacteria as carbon and energy storagecompounds[1,2 ] . Attempts have been made toproduce PHA for biodegradable packaging[3 5] .Various bacterial strains have different PHAbiosynthesis pathways. Gern et al,studying thebiosynthesis pathway of Pseudomonasputida using13C nuclear magnetic resonance,concluded that thestrain synthesized PHA via the de novo fatty acidsynthesis pathway …     

实验室岩石变形电磁信号的观测系统

为了能观测到岩石变形产生的微弱的电磁信号,需要建立一套相应的实验观测系统。典型岩石实验表明,在考虑到变形电磁实验的种种特殊要求,认真选择观测设备,并进行了严格误差校正之后,可以获得可靠的岩石变形过程的电磁辐射信号。并且在机械振动激发条件下,无论岩石是否含有石英,都会产生足够强的电磁辐射信号。但是其中,石英晶体的敲击电磁信号最强,频率最高。该结果对研究地震的电磁现象具有一定的参考价值和指导意义。     

基于改进的Fuzzy C-means聚类算法的纹理分割

提出了一种基于改进的Fuzzy c-means聚类算法的纹理分割方法．改进的Fuzzy c-mean聚类算法(MFCM)的目标函数不仅考虑了样本类内紧致性,而且还考虑了样本类间分离性,加快了MFCM算法的速度;纹理分割实验验证了MFCM算法的有效性。     

高速公路沥青路面大中修质量控制重点

制定和采取科学的施工工艺和严格的质量控制手段,是提高沥青路面大中修质量的关键.本文从原材料、沥青混合料、施工过程等几个方面探讨沥青路面大中修施工质量控制问题.     

聚羟基脂肪酸酯在组织工程中的应用

聚羟基脂肪酸酯（polyhydroxyalkanoate， PHA）是一系列由微生物合成的天然高分子材料，目前已发现有超过150种组成单体不相同的PHA聚合物。由于最常见也是研究最广泛的PHA——聚3?羟基丁酸（PHB）具有优良的生物相容性和生物可降解性，且其降解产物3?羟基丁酸（3HB）对多种疾病具有潜在的治疗功能，PHA相关材料在组织修复与再生领域得到广泛的关注。介绍了不同单体组成的PHA在修复骨缺损、愈合皮肤伤口、重建神经和递送药物等不同组织工程领域的应用，总结了对应的材料制备方法及组织修复机制，为后续PHA的生物医疗应用提供新的思路。     

Ⅰ-Ⅰ型易溶盐溶度积的探讨(Ⅰ)

定量地研究了Ⅰ -Ⅰ型易溶盐的溶度积。研究了“水合效应”和温度效应对该溶度积的影响     

Biosynthesis of Polyhydroxyalkanoates

IntroductionPolyhydroxyalkanoates ( PHA) is a family ofintracellular biopolymers synthesized by manybacteria as intracellular carbon and energy storagegranules ( Figs.1 and 2 ) .PHA is normallysynthesized under conditions of restrictedgrowth[16] .Industrial production has been used toproduce PHAs that are environmentally degradablethermoplastics[710 ] .Fig.1　 General m olecular structure ofpolyhydroxyalkanoatesm=1,2 ,3,yet m=1is the m ost common,n can range from10 0 to several thousand.R…