浅析汽车制动性能的检测     

田晓明 《农业装备与车辆工程》2007,(12):64-65

制动系统是汽车的一个重要组成部分，对汽车行驶安全起着重要的作用。对检测站合理选购制动试验台、注意保养制动试验台和加强检测员的职业道德教育等问题进行了分析和探讨。  相似文献   

利用SSR标记构建贵州山区玉米杂交种的指纹库     

曾桂萍  戴保威  余显权  田兴文 《种子》2007,26(8):45-47

对贵州山区目前在生产上正在使用的西山系列玉米杂交种12份进行了SSR分析。从60对引物中筛选到稳定性好、多态性丰富的8对引物作为核心引物。用这8对引物的指纹组合构建了贵州山区西山系列玉米杂交种的DNA指纹数据库。结果表明,利用SSR技术进行玉米杂交种真实性的鉴定是可行、有效的。  相似文献   

应用RAMP分子标记分析小豆栽培型种质资源遗传多样性   总被引：9，自引：0，他引：9  

佘跃辉  荣廷昭  粟生群  刘坚  田孟良 《作物学报》2006,32(2):217-222

利用42对引物组合，对93份小豆栽培型种质资源的基因组DNA进行了RAMP分析，得到308条扩增谱带，其中297条（96.43%）具有多态性，每对引物组合可扩增出3～17条多态性谱带，平均7.1条，总遗传多样性指数或平均期望杂合度（Ht）达0.693，表明小豆栽培型种质资源内存在较丰富的遗传多样性；小豆种质间遗传距离变异幅度为0.066～0.494，平均值为0.281，表明来源于不同生态区的小豆栽培型种质间的亲缘关系较近；利用RAMP扩增谱带数据进行聚类分析，可将93份小豆栽培型种质材料中的91份区分开，并划分为5个类群；其RAMP分子标记表现出明显的生育特性和生长习性趋同性，及一定的地域相关性。  相似文献   

Nonlinear Characteristic Modeling of Servo Value on Hydraulic Bending Roll System''s Dynamic Characteristic     

WANG Yong-qin  ZHANG Yun-fei  YAN Xing-chun  TIAN Wen-bo 《保鲜与加工》2005,(11):5-7

Nonlinear characteristic of servo value is the important factor influencing hydraulic system, the model of electro-hydraulic servo pressure control system is designed. In this model, flux-equation of servo valve is specially applied and some non-linear characteristics are considered. Furthermore, SIMULINK toolbox of MATLAB language software is applied to solve mathematic model and simulation curves of some variables are obtained. The calculation results are in good agreement with the experimental results.  相似文献   

Reuolution and Research of Green Automobile     

RAN Zheng -y  TIAN Long  NI Ling  YANG Chao  CAO Wen -ming 《保鲜与加工》2002,(7):15-19

The green is as a symbol of no pollution,no public harm and environmental protection. The green automobile is the inevitable results that the automobile technique continuously developes. A new style vehicle--the green automobile is the urgent solicit of environmental protection is developed. The automobile industry can develop continuously. This article mainly discusses the importance of the green auto_mobile's research and development,the development status in quo and prospect of the green auto_mobile technique in the world,and states the relationship between the green automobile technique and environmental protection from green technical system theoretically clarify the study of green automobile,including its design and the system,the manufacture and its technology,the energy,the rebuild engineering and a series of subjects. How to evaluate the cycle and the evaluable mark of the green automobile,the prospect of green automobile are pointed out.  相似文献   

Models to Separate Daily Diffuse Radiation from Daily Total Radiation for Energy Consumption Analysis of Air-Conditioning System     

SU Hu  TIAN Sheng yuan  SU Fen xian 《保鲜与加工》2002,(8):73-76

Both total irradiation and diffuse irradiation are necessary to building energy consumption analysis. At the most cases in China,only total irradiation is available. So some method is needed to estimate diffuse irradiation. Relationship between daily diffuse irradiation and daily total irradiation is analyzed, based on data form Beijing and Chengdu.Polynomial models for Beijing and Chengdu are established to estimate K d form K t . Validation tests show good performance of the models. Monthly means of predicted daily diffuse irradiation is not significantly different from that of the original daily diffuse irradiation. Also,the auto_correlation function of the predicted diffuse fraction, K d is coincident with that of the original K d . Beijing model can accurately predict the data of Chengdu,which is significantly different from Beijing as to the climate,so it is recommended as the general model.  相似文献   

Third-party Logistics Subcontract Design Based on Bilevel Programming     

TIAN Yu  YANG Xiu-tai  XIONG Zhong-kai 《保鲜与加工》2005,(5):139-142

The research theme of this paper is about how third-party logistics provider design a kind of effective incentive mechanism which can not only avoid the moral hazard behavior of the subcontractor , but also promote subcontractor to raise the serving performance constantly, until obtaining the best TPL performance .Through building bilevel programming model where constructing the Nash equilibrium model this paper, the anthors assume subcontract decision variable as endogenetic variable first, and then analyze the optimal solution with the restraint of Nash equilibrium at the time of decision variable as exogenous variable, push the subcontract relationship research at the principal-agent level into the lay that principal-agent combining with whole contract performance optimal decision.  相似文献   

Preparation of Electrochromic and Transparent Film of Polyaniline     

MA Li  HE Yan  TIAN Qing-jun  ZUO Zhe 《保鲜与加工》2001,(2):132-134

The preparation method of transparent film of electrochromism polyaniline on the glass supporter is studied by a dipping polymerization. The electric and optic properities of the resulting film are measured as a function of oxidant,dopant,reaction time and temperature.The optimum technology term is obtained in the normal atmospheric temperature.The experimental result is testified by fuzzy set theory.  相似文献   

The Public Participation in the Urban Planning     

TIAN Wei-ji  LU Li 《保鲜与加工》2007,(3):41

The policy of public participation in urban planning was first practiced in Europe in the 1960s. After 40 years of development, the policy has become the essential step of city planning in Western countries where as is just at the elementary step in China. For the purpose of knowing the situation about the policy performing in local cities and discussing the feasibility of public participation in urban planning, several kinds of investigation have been done. From the investigation, it is found that although the public participation has already been the important step of urban planning in some city during just several years,there are still many problems. This paper shows a panorama view of this issue. Th describe the future of public participation in e authors will offer some solutions according to the problems and the urban planning.  相似文献   

基于AMEsim的柴油机二甲醚供给系统仿真研究     

魏远文  田维  曾东建 《拖拉机与农用运输车》2007,34(4):75-77,90

借助AMEsim仿真软件,建立了ZS1100柴油机机械式供油系统模型,并进行了各个运动件的动态响应特性仿真和分析,得到了柴油机燃用二甲醚供给系统的改进结果,对柴油机燃用二甲醚的供给系统的研究和开发提供了一个有效的工具。  相似文献