磁浮车辆运行平稳性的虚拟激励分析方法

为方便、快速地分析多点输入轨道车辆的平稳性,基于虚拟激励原理,提出了平稳性分析方法。当车辆系统受多点全相关随机激励时,应用此方法将多输入多输出系统的响应功率谱矩阵的计算化简为两个矢量相乘,利用所获得的功率谱和随机振动中的反演技术,分析轨道车辆的平稳性指标。以TR08磁浮车辆为原型,建立了磁浮车辆的垂向动力学模型,运用虚拟激励分析方法计算了磁浮车辆的响应功率谱。在频域中,磁浮车辆车体中心处的Sperling指标为1.653,车辆的平稳性等级为优,通过反演运算获得了响应的幅值谱和时间历程,分析过程简单,计算结果准确。     

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。