个人住房抵押组合贷款模型分析

由于个人住房抵押组合贷款对购买住房的同一借款申请人、使用同一抵押物、采用同一贷款期限、执行不同贷款利率，所以与单纯的政策性个人住房抵押委托贷款或商业性个人住房抵押贷款不同。为此，试图建立一个考虑居民收入增长的个人住房抵押组合贷款理论模型，通过该理论模型可以确定合理的贷款期限以及各年的还本付息额。结合本模型提出了改进现行的抵押贷款还款所采取的等额偿还法，采取随着居民收入的提高逐渐增加每期还款额，从而减少总的还款期限的建议。最后提出引入合同储蓄贷款的组合贷款理论模型，运用该理论模型可以测算引入合同储蓄贷款的组合贷款期限以及各年的还本付息额。     

应用BP神经网络模型实现内圆磨床主要零件的快速反应设计

用数字化模型代替三维实体模型，将内圆磨床主要大件的BP神经网络模型放入数据库信息管理系统，应用较简单的使用方法实现了零件结构的再修改、灵敏度分析及优化．根据所提出的方法，通过从数据库信息管理系统中调用桥板的数据文件，对其进行结构参数修改、灵敏度分析及以第1阶扭转频率最高为目标的设计变量自动搜索寻优计算，结果表明将BP神经网络模型与数据库信息管理系统结合是实现零件快速反应设计的有效途径．     

二硅化钼机械球磨过程的研究

通过X射线衍射仪、电子显微镜和ZJM10T型搅拌机研究了MoSi2粉末球磨过程.结果表明:机械球磨过程中,MoSi2粉末的衍射峰强度随球磨时间的增加不断减弱且逐渐宽化;其机械化学变化随球磨时间的延长表现为:晶粒尺寸减小,显微应变增加,有效温度系数增加.机械化学效应因子之间的变化关系如下:晶粒尺寸与有效温度系数和显微应变呈逆变关系;显微应变随有效温度系数增加而增大.     

火车车钩舌面仿形自动堆焊机仿形系统设计

火车车钩舌面经常需要进行焊补，传统的手工堆焊工效低且质量差，为配合仿形自动堆焊机的研制，本文设计了自动堆焊机的控制系统，该系统采用眦控制技术，两个伺服电机、一个步进电机驱动和三维精密工作台机械传动，实现三坐标、多道自动堆焊，保证S面精确成型。经过调试及模拟运行后表明，该控制系统能使焊枪运动轨迹为要求的S形，并使Z向工作台在规定的时间内上下运动，保证了自动堆焊机的仿形精度和工作效率，达到其技术要求。     

转型期大学生心理健康与父母养育方式研究

以大学生心理健康为出发点，采用《心理卫生症状自评量表SCL-90》、《父母养育方式问卷》对重庆市300名大学生进行测量，探讨大学生心理健康与父母养育方式的现状、影响因素及其关系。结果表明：大学生心理健康问题主要表现在人际关系、强迫、敌对和偏执等方面；性别因素在父母养育方式上存在显著性差异，但在心理健康方面不存在差异；父母是否离异、下岗等因素对学生心理健康不产生影响，但离异因素在父亲的严厉、惩罚，下岗因素在父亲的过度保护的教养方式上存在显著差异；父母亲的文化程度、职业因素对心理健康和教养方式的部分因子产生了影响；父母亲积极的教养方式会提高学生的心理健康状况、减轻学生的心理焦虑，消极的教养方式则会增加学生的焦虑。     

Efficient expression of human factor Ⅸ cDNA in liver mediated by hydrodynamics-based plasmid administration

The transfection of plasmid DNA into mammalian cells is an indispensable tool in the study of gene transfer and gene function. Since the original report in 1990 on the successful expression of a reporter gene in muscle[1], plasmid DNA injection has been widely used to mediate gene transfer study. As a gene transfer vector, naked DNA has many obvious advantages. It is easy and cheap to be prepared and more safe after transfection. But the plasmid mediated gene expression is low because of t…     

Shift visual cryptography scheme of two secret images

A new visual cryptography scheme of two secret images, which is named the shift visual cryptography of two secret images, is given. The compound function family of a general construction model is also introduced. The uniqueness and validity of this model are proved, and the minimum rows and columns for realizing the scheme are obtained. Compared with visual cryptography of one secret image, the shift visual cryptography scheme can share two secret images with the same size of pixels expansion without losing the contrast. It has randomness and various forms, and furthermore, we can also visually recover two secret images even if the two shares are different in form and color.     

Rapid cold hardening process of insects and its ecologically adaptive significance

In contrast to overwintering cold hardening, a rapid cold hardening process has recently been described in insects. This process can rapidly enhance cold tolerance of insects in several hours or even minutes. The characteristics of rapid cold hardening include inducing conditions, cold hardening effects, and fitness costs. Physiological and biochemical mechanisms of rapid cold hardening include rapid changes in the phospholipid composition and the increase in hemolymph osmolalities, polyols production, proline and cold-induced proteins. Moreover, there are different views about the ecologically adaptive significance of rapid cold hardening in insects. This paper reviews research results about rapid cold hardening of insects since 1987, focusing on forms of cold injury, strategies of cold tolerance, and definitions, characteristics, physiological and biochemical mechanisms and adaptive significance of rapid cold hardening.     

井下掺液抽稠油泵研究

通过对常规泵进行串联、改造 ,研制出了井下掺液抽稠油泵。对泵结构的可行性进行了论证 ,阐述了泵的工作原理 ,并对泵的工作参数进行了分析。该泵是通过从油管掺入液、从油套环空产出液 ,在上冲程时吸入产出液 ,在下冲程时举升混合液 ,从而实现了在柱塞下方掺液 ,避免了出现砂磨柱塞的现象 ,减少了稠油对柱塞运动的阻力 ,克服了泵上掺液不能降低进泵原油粘度的缺点 ,解决了在井筒降粘和稠油抽汲中存在的问题。该泵使用了连动式凡尔与弹簧 ,保证了底阀与顶阀打开与关闭的同步性 ,能够达到吸入产出液、加入掺入液以及举升混合液同时进行的目的。该泵的设计原理可行 ,工艺容易实现 ,是一种理想的新型抽稠油泵。     

A UDDI Based Shared Resources Management Mechanism in Virtual Enetrprises .

Service and information resources are two kinds of major shared resources in virtual enterprises, where, service resources include third party‘s service resources and enterprise‘s legacy service resources, and information resources include database resources and file resources. Since service and information resources have distributed, autonomic, remotely bound as well as some other similar characteristics, an implementation mechanism on managing shared resources based on UDDI are presented. XML instances are used to describe resources authorization information, WSDLbased special XML instance represents information resource metadata, and these XML instancesare referenced by tModel for realizing the purpose of managing shared resources metadata based on UDDI.