重庆石板坡大桥施工控制方案研究

石板坡大桥位于重庆主城区,结构采用连续梁与连续刚构混合连续体系,主跨跨度在同类型桥梁中居世界之首.结合该桥设计及施工特点,在常规控制方法基础上,对桥梁收缩徐变、温度变形修正及桥梁三维线形的控制等方面做了深入的研究.     

人肾癌鸡胚模型的建立及其肿瘤生物学特性的研究

目的建立人肾癌鸡胚模型,探讨其形态及生物学特性。方法将肾癌细胞系RLC-310接种于鸡胚绒毛尿囊膜,观察影响肾癌鸡胚移植瘤成活的因素、移植瘤生长特性、形态学特征和生物学性状。结果成功建立了人肾癌鸡胚移植瘤模型;移植瘤易于生长并具有较强的血管诱导作用;光镜下移植瘤具有与人肾癌类似的组织结构。结论该模型容易建立,能动态观察肾癌诱导血管生成的全过程,可用于肾癌的实验研究。     

株洲垮塌现场 中联重科再立新功

接受指令5月17日下午16点42分,株洲市区发生桥梁坍塌事故,人员伤亡惨重。詹纯新董事长在获悉此事后,指示公司办公室主动联系省委省政府有关部门,询问是否需要企业调派设备和人员参加救援。20点20分,中联重科接到湖南省委办公厅电话指令,要     

Design and control of a coupling mechanism-based prosthetic hand

A five-fingered, multi-sensory and biomimetic hand is presented. The cambered palm is specially designed by utilizing the knowledge of anatomy. The position of each finger is arranged according to human hand skeleton. Each finger with three phalanges could fulfill flexion-extension movement independently. All the fingers are designed using coupling link mechanism. The location of the thumb is designed by maximizing interaction area between the thumb and other fingers. The opposite thumb could grasp along a cone surface, while maintaining its function. The hardware architecture is divided into control system and human-machine interaction system. The mechanical parts, sensors and motion control systems are integrated in the hand structure. In addition, a skin-like glove is designed, which makes the hand more humanlike. According to our primary experimental results, the hand can accomplish several grasp modes by applying an intuitive surface electromyography control scheme. The success rate of 10 modes is up to 90%.     

HIGN LEVEL EXPRESSION OF HEPATITIS C VIRUS CORE GENE IN E.COLI

Hepatitis C virus (HCV) is the major agentfor the posttransfusinal and diffusive non- A,non-B hepatitis that could transform to chronic hepati-tis,and also has close relation to liver cancer andcirrhosis[1] .HCV is a single positive- stranded RNA viruswhose genome(about9.4kilobases) contains asingle uninterrupted open reading frame (ORF )which encodes a polyprotein precursor of 30 1 0～30 1 1 amino acid residues.The genome of HCV issimilar to flavivirus and pestivirus.In vitrostudieshav…     

岩石爆破条形药包爆炸能量的近似分析

对岩石爆破条形药包爆炸各项能量分布予以近似理论计算。由于岩石爆炸气体压力场、岩石运动速度场及应力场的有所变化，单一条形药包与单一集中药包爆炸能量分布计算过程及结果均有所差异，而岩性对爆能分布的影响保持不变。     

两种全身振动评价方法对应关系的探讨

本文对国际标准ISO2631/1-1985推荐的1/3倍频程中心频率加速度(rms)限值评价法与全频域计权加速度(rms)评价法的对应关系进行了初步探讨,通过逐步回归分析得到了反应两种评价方法对应关系的回归方程,即垂向振动A_(zw)=-0.0358+2.7×10~(-3)V+1.1522A_(max);横向振动A_(yw)=0.0199+6×10~(-4)V+1.2516A_(max)。 1972年ISO国际标准化组织提出了ISO/DIS2631“人体暴露于全身振动的评价指南”然后由各个成员国做了某些修改,于1975年采纳为国际标准;接     

农用地估价中的评分估价法研究

针对国土资源部发布的《农用地估价规程》中的评分估价法的概念、步骤,就其实现方法进行了一系列的改进研究,提出采用回归分析法确定影响因素因子体系及其权重,并建立分值与价格之间的回归数学模型,同时采用模糊综合评判方法计算待估宗地的综合作用分值,最终得到其评估价格.