共查询到20条相似文献，搜索用时 15 毫秒
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YAO Qing-liu 《保鲜与加工》2007,(9):93
The purpose of this paper is to consider a kind of special nonlinear Neumann boundary value problems. The kind of boundary value problems has not Green function. Using suitable transformation,we can change these problems to general Neumann boundary value problems. By applying integral equation and degree theory on cone,the existence of n positive solutions is proved for the kind of problems,where n is an arbitrary natural number. 相似文献
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Li RonglinJiang ZejiaYu Jihui 《保鲜与加工》1992,(3):24-30
A B-spline finite etement method for solving general 2-D electromagnetic field problems is established. The B-spline bases for a general field region are constructed using the Bspline interpolation functions defined on a rectangle which contains the region. The Dirichlet boundary condition is dealt with by means of the generalized variational principle. Two numerical examples are given that show the characteristics and practical value of the method. 相似文献
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加强食品添加剂监管的措施 总被引：2，自引：0，他引：2
食品安全是目前颇受关注的全球性问题之一。食品添加剂作为食品工业的特殊成分,长期以来一直备受争议。在介绍食品添加剂基本知识的基础上,就食品添加剂在食品安全中存在的问题,以及怎样规范、合理使用添加剂等方面作了较为详尽的阐述,介绍了食品安全方面的最新措施。 相似文献
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综述我国麻类生产加工业的基本现状、产品及市场需求、技术水平与研发力量、发展趋势和存在的问题,并对麻类生产加工业中存在的技术问题及其发展提出了政策支持意见和建议。 相似文献
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开发建设项目水土流失量预测是水土保持方案编制的依据和关键,针对水电站工程水土流失预测过程中出现的种种问题,如预测分区的混乱,预测面积不准确,预测时段划分不正确等,提出了相应的对策。给出了水土流失预测项目区划分图,对预测过程中流失系数的算法进行了分析,作者建议从侵蚀因子、选择类比法来或查阅相关水文资料确定流失系数。 相似文献
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OU Yang_an XIAO Wei_pin 《保鲜与加工》1999,(5):39-45
Selecting the constructional address is a key problems on the investment decision of the cons-tructional project.This paper establishes the general methods of multi-target decision on the constrcutional address,and using AHP and the Efficiency coefficient Method(ECM) to advance the Synthetical System Method(SSM)of multi-target decision and the example of its applicalion is given. 相似文献
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For the requirement of building up the battery management system of hybridelectric vehicle,the method of quick charge of batteries is investigatedunder the conditions of ensuring natural life of batteries. The characteristics of the general charge methods areanalyzed, and existing problems of these charge methods are discussed. In order to solve those problems, a new quick charge method for HEV batteries is proposed, which can shorten charge time under the variable-current condition of the battery pack,andcan sustain the state of charge (SOC) of batteries within the scope between 50% and 80%. 相似文献
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Tang Jian Duan Yurong 《保鲜与加工》1991,(1):42-51
This paper presents two trust region algorithms for solving general nonlinear equality constrained optimization problems. The different techniques are used in minimizing a quadrdtic approximate model of the original optimization problems in trust region. By the convergence analysis, the global convergences and local superlinear convergences of the algorithms are obtained. Finally,the implementations of the algorithms are given. 相似文献
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Computable general equilibrium (CGE)model's solving is important for its reseachers . Though there are many softwares to solve the CGE model, it is very important for its reseachers to understand CGE model's solving principle. The paper introduces the methods,principles and problems of CGE model's solving.The software -MATLAB is used to solve CGE Model, and reseach the existing problem of CGE model's solving. 相似文献
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食品专业生物化学课程实验报告分析 总被引：1，自引：0，他引：1
对食品专业生物化学课程实验报告的构成进行了分析,了解课程实验报告中分数、人数、性别、班别、分数段各项组成的变化情况,查找学生在实验中普遍存在的问题,为改进课程实验考核方式提供科学依据。 相似文献
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Zhang Peiyuan Liu Song 《保鲜与加工》1989,(2):10-16
It's recommended that the term coupled in temperature and strain is nonlinear and is significant in thermoelastic theory. Using the solution of linear coupled and uncoupled theory and selecting appropriate general coordinates, authers approach the nonlinear coupled problems with a variational method. A solution to the problem in half space, is given. It is shown that the difference between the nonlinear coupled theory and the linear coupled or uncoupled theory would be notable when the amplitute of temperature is much larger than that of the reference slate. 相似文献
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Shi Libao Hua Zhiming Xu Guoyu 《保鲜与加工》1997,(6):67-72
A new algorithm,based on the combination of the evolutionary programming with the traditional gradient adjustment technique,is presented for solving the optimal power flow problem which describes some technical problems(representations of candidate solutions,evaluation function,mutation operator).Its efficiency is higher than that of general evolutionary programming. 相似文献
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陕西省是我国猕猴桃主产区之一,近年来开始发展有机猕猴桃生产。以陕西猕猴桃的发育期为主线,根据猕猴桃各发育阶段的病虫害发生特点,结合国内外有机生产中病虫害防治技术的发展,探讨了有机猕猴桃生产中的病虫害问题,并提出了具体的防治技术。 相似文献
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农田土壤重金属污染监测技术发展趋势 总被引：3，自引：1，他引：2
农田土壤作为人类各种粮食作物赖以生存的自然环境,其生态环境问题一直是环境科学界研究的热点。随着世界工业化和城市化进程整体快速推进,环境污染日益加剧,土壤的重金属污染甚为严重,为了更好地对土壤环境进行监测评估和控制,研究和开发有效的检测土壤重金属方面的仪器和监测方法是十分必要的。为此,简述了国内外常用的实验室监测农田土壤重金属污染的技术及其监测局限性,同时重点介绍了基于激光诱导击穿光谱法和磁化率法这2种现场快速监测技术的研究发展现状及对其未来发展需要解决的关键问题进行了探讨。最后对比分析了实验室及现场快速这2种监测方式自身的优劣势,进而探讨了未来区域农田土壤重金属污染监测技术的发展趋势。 相似文献
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During the implementation of Cleanroom Model, there are a lot of particular problems need to be resolved, which make it indispensable to grasp the essence and the principles of CRM. The article is on the essential research work in the design procedure of the Cleanroom technology. Through the analysis, it proposes a general architecture, based on which the entry point of the solving process and the distribution of the reducing procedure are introduced. 相似文献