PLC与SIMENS数字传动装置组合控制模式

GE-9070PLC为GE系列的换代产品,SIMENS数字传动装置为模拟传动装置的换代产品,具有高性能、低价格的特点,它们的有机组合构成一种经济实用型的自动化控制系统,成为近年来许多轧钢企业的首选控制模式.     

Presence of hsp65 in bacterial extracts (OM-89): A possible mediator of orally-induced tolerance?

Heat shock proteins (HSP) have been implicated in rodent models of autoimmunity, particularly arthritis, and there is suggestive though inconclusive evidence that they may also play a role in human autoimmune disease. The simplest hypothesis is based on molecular mimicry due to the amino-acid sequence homology between mammalian and microbial HSP. Recently OM-89, an extract of several strains ofEscherichia coli, has shown some efficacy in the treatment of rheumatoid arthritis (RA) when taken orally. Using species-specific antibodies, we show here that OM-89 contains the 65 kDa HSP (hsp65), while hsp65 was not detected in another bacterial extract containing other microorganisms, includingStaphylococcus aureus (OM-85). We suggest that if the human homologue of hsp65 is a relevant target antigen in the human disease, the efficacy of the preparation could be due to induction of oral tolerance or to switching the Th1 response towards Th2. Alternatively, even if the human hsp65 is not a target molecule in RA joints, OM-89 may evoke bystander suppression of joint inflammation via induction of TGF-secreting effector cells. These hypotheses should be tested in further studies.     

静注西咪替丁对十二指肠溃疡出血患者24h胃内pH值的影响

１５例十二指肠球部溃疡出血的患者随机分为３组,分别静脉注射不同剂量的西咪替丁（Ｃｉｍｅｔｉｄｉｎｅ）并以生理盐水作为对照,用２４ｈ胃内监测仪来观察用药对胃酸分泌的影响。结果显示：各用药组的胃内ｐＨ值均有升高,各组间差异有显著性意义（Ｐ＜０００１）。各用药组ｐＨ值均高于对照组（Ｐ＜０００１）,只有药量达１６００ｍｇ／ｄ时才有满意抑酸效果,抑酸时间为（１９３±４７）ｈ,胃内ｐＨ值均数为６４±０９。     

Spontaneous transformation of C60Br24 to C60 in solvents

It was found that C₆₀Br₂₄ transforms to C₆₀ spontaneously in some solvents. The intermediate, C₆₀Br₈, can be separated in some cases. When the bromine trap, phenol, was added,p-bromophenol and other brominated product were obtained and identified. The influences of time, the kind of solvent, etc were investigated. Possible mechanism was suggested. Supported by the National Natural Science Foundation of China Liu Ying: born in 1969, Ph. D     

Nα-quinaldyl-L-arginine·HCl,a new defensive alkaloid fromSubcoccinella-24-punctata (Coleoptera,Coccinellidae)

The isolation of N-quinaldyl-L-arginine·HCl (1) from the CoccinellidaeSubcoccinella-24-punctata is reported. The structure, first established on the basis of the analysis of the spectral properties of1, has been confirmed by synthesis. The alkaloid is of endogenous origin and markedly deterrent to ants.     

Cyclophosphamide-impaired regulation of hepatic heme metabolism

Summary Im male rats hepatic cytochromes b₅ and P-450 were reduced at different times after treatment with cyclophosphamide (CP) (200 mg/kg i.p. for 3 days). In contrast, microsomal heme did not change until 48 h after the last dose of CP, leading to accumulation of heme in a non-cytochromal form. Parallel to the above changes the heme metabolism showed derangement: -aminolaevulinate synthase, the rate-limiting enzyme in heme synthesis, was depressed and heme oxygenase, the enzyme which catalyzes the oxidative degradation of heme, was increased.     

四维超混沌LC振子的同步研究

采用误差变量的线性组合对超混沌系统进行单向反馈控制，解析地证明了实现同步的可能性，从Lyapunov理论角度分析了对四维超混沌LC振子采用单变量单向耦合的可行性，求出同步所需控制器要满足的条件，当驱动系统参数做周期变化时，应用文中的控制器很好地实现了两个超混沌系统的同步．     

用LC并联谐振回路作为天线发送振幅键控信号的研究

用ＬＣ并联谐振回路作为天线发送振幅键控调制信号时，会出现较大的波形失真。文章较详细地分析了失真的原因，并对采取的克服措施进行了介绍。     

山西旅游吸引物空间结构的初步分析

旅游吸引物是指对旅游者具有吸引力，给旅游者以积极效益的旅游地所有因素的总和，旅游吸引物空间组织及结构优化是旅游目的地经济、社会、环境、文化正面效益最大化和负面效益最小化的有效途径，本文以山西省假日旅游统计的24处重点旅游区（点）为分析样本，用邻近地理指数理论得出山西旅游吸引物在地理空间分布上呈大分散、小聚集的总体特征，进而用旅游地紧密度指数理论对山西旅游吸引物空间扩散予以设想，同时用引力模型理论对旅游吸引物空间竞争给以分析，为山西旅游吸引物空间结构进一步优化做一定参考建议。