高速公路通信管道工程设计浅析

详细介绍了哈双高速公路通信管道工程的设计及技术标准     

ADENO-ASSOCIATED VIRUS INTRODUCED INTEGRATION AND EXPRESSION OF FOREIGN GENES IN PC12 CELLS

The ability to induce the expression of targetgenes in neurons is a goal of molecular neurobiolo-gy up to now. A variety of means including lipo-somes and recombinant retrovirus vectors and re-combinant adenovirus vectors have been used to ac-coplish this goal. Each method has some specificdisadvantages['J. None can provide reliable andcontinuouk gene expression in neurons of the cen-tral nervous system.Vectors derived from adeno--associaed virus(AAV ) have the potential to stably transducem…     

A HISTOPATHOLOGIC IMMUNOHISTOCHEMICAL AND ULTRASTRUCTURAL STUDY OF RABBIT CORNEA AFTER EXCIMER LASER PHOTOREFRACTIVE KERATECTOMY

In excimer laser photorefractive keratectomy(PRK), the central part of the Bowman's mem-brane and superficial stroma is ablated after re-moval of the corneal epithelium. Clinical studiesshowed that the results of PRK for myopia of up to--6 diopters are satisfactory[' 'J. However, deeperresearch is needed, especially the healing processfollowing PRK,which is different from the woundhealing mechanism after conventional occularsurgery['.'J. Corneal haze and myopic regression arethe 2 main co…     

RESEARCH OF NUTRITIONAL AND IMMUNE STATUS IN PATIENTS WITH GALLBLADDER CARCINOMA RADICAL CHOLECYSTECTOMY

RESEARCH OF NUTRITIONAL AND IMMUNE STATUS IN PATIENTS WITH GALLBLADDER CARCINOMA RADICAL CHOLECYSTECTOMY@何平 @石景森 @陈武科 @任宏 @张一力$西安工业学院校医院~~     

EFFECT OF THE TOTAL SAPONIN OF DIPSACUS ASPER ON INTRACELLULAR FREE CALCIUM CONCENTRATION IN THE CELLULAR MODEL OF ALZHEIMER‘S DISEASE-SCANNING CONFOCAL MICROSCOPY

ＡｌｔｈｏｕｇｈｔｈｅＡｌｚｈｅｉｍｅｒ’ｓｄｉｓｅａｓｅ(ＡＤ)ｗａｓｄｉｓ ｃｏｖｅｒｅｄｂｙＡｌｏｉｓＡｌｚｈｅｉｍｅｒ ,ａＧｅｒｍａｎｎｅｕｒｏｐａｔｈｏｌｏ ｇｉｓｔ,ｉｎｅａｒｌｙ 2 0ｃｅｎｔｕｒｙ ,ｉｔｄｉｄｎｏｔｇａｉｎｍｕｃｈｐｕｂｌｉｃａｔｔｅｎｔｉｏｎｕｎｔｉｌｔｈｅｌａｓｔｔｗｏｄｅｃａｄｅｓ .Ａｓｔｈｅｌｉｆｅｓｐａｎｏｆｈｕｍａｎｂｅｉｎｇｓｐｒｏｌｏｎｇｓ ,ｔｈｅｎｕｍｂｅｒｏｆｐｅｒｓｏｎｓｗｉｔｈＡＤｈａｓａｌｓｏｉｎｃｒｅａｓｅｄ .Ｂｅｓｉｄｅｓｃａｎｃｅｒａｎｄ…     

岸边集装箱起重机时变系统结构动力响应分析

起重机金属结构动力响应具有随时间变化的变质量、变刚度、变阻尼的时变系统特征。时变系统振动分析是普通有限元计算分析软件无法解决的。本文应用时变系统分析理论,建立起重机计算模型的运用方程,编制了相应的动力计算软件,计算了岸边集装箱起重机在小车运行过程中产生的时变响应,具有较高的实用性。     

风量与风压的简易测量及应用

锅炉正常燃烧必须有充足的风量,当锅炉鼓风或引风不足将导致锅炉效果恶化,锅炉出力、热效应率明显下降。结合工程实例,介绍结托管简揭测试鼓、引风系统各部分风压、风量,帮助判断分析工程实际问题的简便方法。     

自励式缓速器的设计与试验研究

基于转筒式电涡流缓速器与永磁发电机功能相结合的思想,提出了一种自励式电涡流缓速器的方案,并设计和制造了制动转矩为500N·m的自励式缓速器样机.最后在台架上进行了自励式缓速器的制动转矩、转筒温度和1 500r/min拖磨试验,揭示了自励式缓速器的某些特性.     

天津地区碎石混凝土超声回弹综合法测强曲线研究

采用天津地区常用材料制作碎石混凝土试块,进行超声回弹试验和压力试验,采集相关数据,进行4种函数模型的拟合回归,建立了天津地区碎石混凝土的超声回弹综合法地方测强曲线并进行了验证,误差分析和验证结果表明所建曲线满足相关规程的要求,为天津地区混凝土超声回弹综合法测强提供了可靠保证。     

加工工艺对盾构隧道环间锚式接头受力影响的数值研究

为研究加工工艺对盾构隧道环间锚式接头受力特性的影响,基于锚式接头荷载试验,采用ABAQUS有限元软件建立锚式接头的精细化模型。首先,通过与试验结果进行比较,验证数值模型的合理性与可靠性,并分析得出锚式接头各部件间的摩擦因数参考值。其次,研究锚式接头在拼装过程中所需的压力、接头达到破坏荷载时的张开量随摩擦因数和套环壁厚与插入间隙尺寸差的变化规律。最后,数值分析结果表明： 部件间的摩擦因数参考值取0.50比较合理;为保证锚式接头正常工作,加工时部件间的摩擦因数应为0.46~0.52,套环壁厚与插入间隙尺寸差应为-0.05~0.01 mm;锚式接头在加工过程中的加工精度要求较高。