基于大规模光栅阵列光纤的分布式传感技术及应用综述

光纤布拉格光栅传感技术因其具有高灵敏度、抗电磁干扰、体积小及易复用等特性而广泛应用于恶劣环境的温度、应变及振动等物理量检测.基于在线光纤拉丝塔的大规模光栅阵列光纤制备方法的实现,突破了传统光纤光栅分布式传感技术受限于机械强度和制备工艺复杂的限制,大大拓展了其在分布式传感领域的应用.本文系统地介绍了大规模光栅阵列光纤的制...     

基于模态应变能与频率信息修正的结构多损伤识别研究

在工程结构的损伤诊断领域,采用模态应变能方法对多损伤识别的结果一般不太稳定,易产生误判现象．为了解决以上问题,提出了一种基于模态应变能与频率的信息修正识别方法．该方法首先利用应变能方法对结构损伤问题进行了初步的识别并获得局部决策,然后引入了频率识别方法以获得补充决策信息,最后利用证据融合理论对所获得的局部决策进行了信息融合修正,从而获得精度和识别效果更高的整体决策信息．仿真结果表明,采用了信息融合修正方法的结构多损伤定位,可以产生比单一信息源更精确、更完全的估计和判决,其识别效果不仅明显好于应变能方法,而且优于频率识别方法．     

树鼩对人乙型肝炎病毒易感性的验证

为验证树Ｑｕ对人乙型肝炎病毒（ＨＢＶ）的易感性,用含ＨＢＶ的人血清接种给１０只成年树Ｑｕ（雌雄各半）。然后每周抽血１次,每只动物共抽血１１次。用不同公司生产的ＥＬＩＳＡ试剂检测接种后的动物血清感染指标。实验观察至１３周,结果分别有９只和８只动物出现ＨＢｓＡｇ阳性,持续最短１周,最长７周。用ＰＣＲ检测,结果有１只动物连续４周在血清中检测出ＨＢＶ ＤＮＡ。表明树Ｑｕ能感染人ＨＢＶ,但实验有待改进以延长感染持续时间。     

日本专利代理行业现状研究

伴随着我国社会、经济的快速发展,作为促进经济发展的重要助手,专利代理行业也在不断变革以适应新的形势。本文从日本入手,初步研究了日本辨理士及日本辨理士会的现状,以期为我国专利代理行业的发展提供参考。     

桑茶的研制

本文研究了以桑叶为原料生产桑茶的方法,并对桑茶中各种营养成份进行了测试分析。桑茶中含有近二十种氨基酸、多种维生素、芸香甙、檞皮素、叶绿素、类胡萝卜素、谷甾醇等。桑茶是一种有保健作用的老少皆宜的健身茶。     

Fe（CO）5光催化烯丙基苯异构化反应机理的理论研究

用ＣＮＤＯＳ／２方法研究并确认了羰基铁光催化烯丙基苯异构化反应的途径。证实了１，３－Ｈ转移机理，而ＨＦｅ（ＣＯ３）（π－烯丙基）机理是不合理的。计算所得活化能与实验值符合得很好。     

以蔗糖为原料制取高果糖浆的研究

本文简要叙述了高果糖浆的现实意义以及国内外的生产发展概况。本项实验重点对果糖和葡萄糖的分离进行了研究。以国际上先进的理论为依据,以蔗糖为原料制取了含果糖高于90％的高果糖浆。     

N维极性晶体中的慢速运动光学极化子

本文用改进了的线性组合算符法讨论Ｎ维极性晶体中的慢速运动光学极化子．在强耦合和中间耦合（含弱耦合）极限下，导出了极化子的基态能量、有效质量以及围绕电子的平均虚声子数．在普适耦合范围内，给出了相应的数值计算结果．     

A peptide deformylase-ribosome complex reveals mechanism of nascent chain processing

Messenger-RNA-directed protein synthesis is accomplished by the ribosome. In eubacteria, this complex process is initiated by a specialized transfer RNA charged with formylmethionine (tRNA(fMet)). The amino-terminal formylated methionine of all bacterial nascent polypeptides blocks the reactive amino group to prevent unfavourable side-reactions and to enhance the efficiency of translation initiation. The first enzymatic factor that processes nascent chains is peptide deformylase (PDF); it removes this formyl group as polypeptides emerge from the ribosomal tunnel and before the newly synthesized proteins can adopt their native fold, which may bury the N terminus. Next, the N-terminal methionine is excised by methionine aminopeptidase. Bacterial PDFs are metalloproteases sharing a conserved N-terminal catalytic domain. All Gram-negative bacteria, including Escherichia coli, possess class-1 PDFs characterized by a carboxy-terminal alpha-helical extension. Studies focusing on PDF as a target for antibacterial drugs have not revealed the mechanism of its co-translational mode of action despite indications in early work that it co-purifies with ribosomes. Here we provide biochemical evidence that E. coli PDF interacts directly with the ribosome via its C-terminal extension. Crystallographic analysis of the complex between the ribosome-interacting helix of PDF and the ribosome at 3.7 A resolution reveals that the enzyme orients its active site towards the ribosomal tunnel exit for efficient co-translational processing of emerging nascent chains. Furthermore, we have found that the interaction of PDF with the ribosome enhances cell viability. These results provide the structural basis for understanding the coupling between protein synthesis and enzymatic processing of nascent chains, and offer insights into the interplay of PDF with the ribosome-associated chaperone trigger factor.     

数据挖掘中概念格建造算法研究

文章概述了几种基于概念格的数据挖掘算法,简要分析了这几种算法的思想,从而为在实际应用中使用这些算法提供了一定程度的参考。