赣江尾闾多级分汊河道分流影响因素及联动响应分析

基于赣江尾闾综合整治模型,分析不同试验条件和工程措施下多级分汊河道分流特点,探讨多级分汊河道联动响应规律。试验结果表明:上游来流量、分汊口地形、洲头位置、支流进水口门地形及各支流水面比降对分汊口分流特性将产生不同程度的影响;改变影响某一分汊口分流特性的影响因素,除对该分汊口分流比有影响之外,相邻分汊口将会产生联动响应,使得相邻分汊口的分流特点发生改变。     

浅谈火灾自动报警设备的选择及控制

火灾自动报警系统探测火灾隐患,肩负着安全防范重任。因此,火灾自动报警系统设备选型尤其重要。文章简述了消防设备的具体特点及工艺流程,探讨了火灾自动报警系统设备的合理选型。     

Dynamic Analysis of Four-Bar Beating-up Mechanism with Joint Clearance

For the four-bar beating-up mechanism of air-jet loom,the plain bearing of linkage is the bearing with dynamic load,and is immersed in the lubricant-box.If the joint clearance is considered,the research on linkage movement could be very complicated.In this paper,the kinematic characteristics of four-bar beating-up mechanism with joint clearance were studied by analyzing the trace of journal center and the balance of radial,tangential forces,and bearing load.The region of principal vibration and its forming ...     

张家界市旅游产业关联效应分析

张家界市旅游业发展对国民经济及其他产业具有关联带动作用。采用1989—2009年统计数据,利用回归分析和弹性分析方法计算张家界市旅游业与国民经济及其他产业发展的弹性系数,系统分析张家界市旅游业对各产业部门增长的关联带动作用。     

A PATH ANALYTICAL ANALYSIS OF ORGANIZATIONAL INTEGRATION PRACTICES'EFFECTS ON MANUFACTURING FLEXIBILITY AND COMPETITIVE ADVANTAGF

To cope with an increasingly turbulent environment,manufacturing firms increasingly implement integration practices to enhance flexibility in the production process.This research develops a framework to explore the relationships among organizational integration practices,manufacturing flexibility,and competitive advantage.The study develops valid and reliable instruments to measure these constructs,and it applies structural equation modeling to test relationships among these variables using a large sampl...     

基于Java2D技术的连杆机构运动仿真

利用Java2D技术开发了连杆结构仿真软件。通过建立数学模型,对连杆机构进行参数化动态的仿真,实现了程序的W eb访问功能。     

Fine mapping of the awn gene on chromosome 4 in rice by association and linkage analyses

Awnness is a key trait in rice domestication, yet no studies have been conducted on fine mapping or association mapping of the rice awn gene. In this study, we investigated the awnness and genotype of a core collection of 303 cultivated rice varieties and a BC5F2 segregating population of 200 individuals. Combining association and linkage analyses, we mapped the awnness related genes to chromosome 4. Primary association analysis using 24 SSR markers revealed five loci significantly associated with awnness on chromosome 4. The associated markers cover previously identified regions. Fine association mapping was conducted using another 29 markers within a 4-Mb region, covering the associated marker in34, which is close to the awn gene Awn4.1. Seven associated markers were revealed, distributed over an 870-kb region. Combining the fine association mapping and linkage analysis of awnness in the 200 BC5F2 segregating population, we finally identified a 330-kb region as the candidate region for Awn4.1. The results indicate that combining association mapping and linkage mapping provides an efficient and precise approach to both genome-wide mapping and fine mapping of rice genes.     

河南省公路客流空间运输联系强度分析

根据河南省公路客流的O-D数据,运用运输联系强度模型,对河南省空间运输联系强度进行了模拟.模拟结果与实际情况基本一致,并揭示了空间相互作用规律.结果表明,郑州市在客运联系中地位突出,是河南省公路客流联系的重心.而豫东和豫西、豫南和豫北的联系则较为松散.豫北各地市的内部联系紧密.     

城市商旅联动发展探究

城市商旅联动是城市经济发展中出现的一种新的社会现象和组织创新．通过对现代城市商业和城市旅游发展特征的分析。提出了城市商旅联动的概念，分析了城市商旅联动的内涵及作用，阐述了城市商旅联动的必然及作用，以期对城市商旅联动的深人研究作以铺垫．