Designing and Realization of Leak Current Fault Flatroof for Lauch Vihicle Controlling System     

TANG Xian? ming  FAN You? ping  MAO Wan? biao  HANG Rong? jun  ZENG Xue? hong  HUANG Xi? yue 《保鲜与加工》2003,(1):28-33

A visualized analysis system of leak current fault transmission graph is developed. Its functions, program structure and programming principle are described.The system is composed of fault diagnosing module and man machine exchanging module, which make the generation and analysis of leak current fault transmission graph for lauch vehicle controlling system simple and visualized. The system could automatically recognize the picture of transmission and analyze both qualitatively and quantitatively only by drawing it on the monitor by the mouse. Finally an example is given, where a satisfying result is acquired via drawing inputting method which is totally new and expanding-complementing the fault tree alglorithm.  相似文献   

Optimization Method of Turbine Impeller''s Stress and Deformation Calculation     

YE Kang? feng  WANG Bing? le 《保鲜与加工》2003,(1):15

Taking into the feature of computer computing method, using Stress solution of elasticity theory and according to different method of solving of system of second order ordinary differential equations , this article provides two numerical value computing method as for the stress and deformation of the turbine impeller which is within the scope of elasticity . One combines the initial value computing method of system of ordinary differential equations (Runge-Kutta Method) with optimization method, another combines the boundary value computing method of system of ordinary differential equations difference method-with optimization method and three points interpolation method . The proposed method can eliminate the deficiencies of Secondary Calculation method and is particularly suited for programmable computer-based solution . The sample show that results gotten by two methods is nearly equal to the precise results,so they are practicable. They completes the quick and precise calculating of stress and deformation . They have some general meaning , large commonality and the project employing value.  相似文献   

Accumulation and the Harm of POPs to Organisms Lived in Lakes     

ZOU Xiao? bing  CHEN Li? juan  ZHENG Zhe? gen  MENG Gang  PENG Bi? xian 《保鲜与加工》2003,(1):87

The recent works about the accumulation and the harm of persist organic pollutions (POPs) to organisms lied in are widely distributed in lake ecosystem, transferred and biomagnified from prey to predator through pelagic and benthic food web, accumulated in high lipid organ, and increasing concentrations with the increasing of lipid content, age and body length. Until now, the present of POPs in lake ecosystem still has harmful effects to aquatic organism of lakes and can transfers to people through eating fishes from lakes and has some negative effects to human health.  相似文献   

Pressure Distribution of LFG in a Landfill with Vertical Extraction System     

PENG Xu? y  YU Yi  LIU Guo? tao 《保鲜与加工》2003,(1):92-95

In present engineering practice of landfill gas pollution control and its recovery, technical parameters such as extraction flow and radius of influence of a extraction well must be determined by field tests. A mathematical model for LFG migration under a vertical extraction well is established, which comprehensively reflects affects of several parameters including LFG generation rate, extraction flow, air permeability, buried depth of a extraction well and features of the cover layer. By using the model, pressure distribution of LFG around a vertical extraction well in a landfill can be calculated, the radius of influence of the well can also be determined.  相似文献   

Performance Optimization Technique of SYBASE     

XIONG Zhong? yang  LI Ji  ZHANG Yu? fang 《保鲜与加工》2003,(2):72-74

Performance optimizing of business database is a main problem encountered by system administrator, and it will impact the running of whole database system. This paper discusses foundation, principle and technique of SYBASE performance optimizing from the aspect of optimizing tool, database server, database structure design, database application and database running environment based on a truly application system. From the practice application point of view, it presents adoptive efficient optimizing technique and gives contrast before and after optimizing. Finally it explains that database performance optimizing is the precondition and basic to use the database efficiently.  相似文献   

Research and Application of utomation Create of Dimensional Chain Equations under CAD Environment   总被引：1，自引：0，他引：1  

HE Jing? xi  ZHANG Gen bao  ZHAO Yong 《保鲜与加工》2003,3(1):12-14

应用3种保鲜剂配方处理荷花鲜切花,结果表明,3种保鲜剂均能延长荷花的瓶插寿命,尤其是配方Ⅱ处理:保鲜剂A 蔗糖2% 保鲜剂B,且在8～10℃中保鲜的效果最佳,保鲜期可达到9天以上。另外,环境气温越高其保鲜寿命越短。  相似文献   

Application of ObjectARX Technology in Power CAD     

QIU Xin? fu  CHEN Gang 《保鲜与加工》2003,(2):123-126

Considering Object oriented design, abstract mechanism of object and technology of procedure design in ObjectARX are introduced.By analyzing characteristics of power network, the puper it elaborates process of definition special object by using of open structure of AutoCAD inner database , base class provided by ARX and mechanism of calss inheritance and derivative. The class definition of elemens is also given in power system as well. Technology of data exchange is also elaborated. On this base ,object models of power CAD are constructed.Date exchange between PWCAD and the external database is also realized.  相似文献   

Contingent Claims Analysis of Valuation of Risky Debt with Bankruptcy Costs     

CAO Guo? hu  HUANG Wei 《保鲜与加工》2003,(1):138-141

Research on valuation of corporate risky debt is given when bankruptcy costs are taken into account. Bankruptcy costs are expenditures of enterprise that get into bankruptcy, as a result, enterprise asset value is reduced, and debt value is reduced too because bondholders only receive asset value deducted from bankruptcy costs. Differential equation which risky debt value follows is given and a model about infinite maturity debt is obtained. By applying contingent claims pricing and stochastic calculus methods, the paper derives a risky debt value formula, this formula can illustrate the effect of investment policy and dividend policy on risky debt value. At last the results are comporred with results of Merton and Black and it is found that our results improve Merton and Black's.  相似文献   

猪屠宰后pH变化对肉品质的影响   总被引：1，自引：0，他引：1  

沈林園  郑梦月  张顺华  朱砺  李学伟? 《猪业科学》2013,(4):114-115

随着人们生活水平的不断提高,消费者对猪肉的消费喜好逐渐由数量型向质量型转变。然而随着现代规模化、集约化养殖的加速发展,以及选育重点仅落在生长速度和瘦肉率上,导致猪肉的肉质呈现下降趋势。因此,了解影响猪肉品质形成的因素,可以为肉质改善奠定基础。pH作为肉质中最重要的一项指标,是肉质形成的关键因素,对pH与其他肉质性状的相关性进行详细阐述,希望能为肉质研究者带来一些启示。  相似文献   

吐鲁番市13个品种桑树叶的营养和活性成分分析与评价   总被引：1，自引：0，他引：1  

郭红梅  梁雎  刘志刚  李海峰  胡西旦?买买提  任红松 《保鲜与加工》2021,21(6):100-106

为明确吐鲁番市桑叶的营养和活性成分含量,促进桑叶资源的开发利用,以13个桑树品种为研究对象,测定了叶片中游离氨基酸、可溶性固形物、叶绿素、VC、花青素、生物碱、β-胡萝 卜素、黄酮苷、褪黑激素、总多糖、总酚、γ-氨基丁酸和类黄酮含量,并采用主成分分析和聚类分析方法对桑叶品质进行了综合评价.结果表明,13个不同品种桑叶的营养和活性成分存在一定程度的差异.品质综合得分排序为:药桑＞无核大10＞黑桑＞白桑＞台湾长果＞育711＞嘉陵30＞龙桑1号＞大青条＞强桑1号＞粉桑＞公桑＞选792,聚类分析将供试的13个桑树样品划分为5大类,各品种间在营养指标上有较大差异.由主成分分析综合评分得出,药桑、无核大10、黑桑、白桑、台湾长果等品种桑叶品质较佳.  相似文献