裸子植物体细胞胚胎发生和人工种子的研究   总被引：8，自引：0，他引：8  

杨映根  桂耀林 《种子》1995,(3):25-30

该文介绍了一种作为森林种子的大规模增值的有效方法－－裸子植物体细胞胚胎发生和人工种子的研制。其内容包括：（１）胚性愈伤组织的诱导与保存；（２）影响体胚发生的因素；（３）体胚的发育与成熟；（４）大规模培养体胚；（５）成熟体胚的干化、包理与人工种子生产；（６）体胚的萌发和转换。最后对人工种子的应用前景进行了讨论。  相似文献   

Fault Section Diagnosis Algorithm of Distribution Networks Based On Topology Identification     

LIN Jing dong  CAO Chang xiu  ZHANG Bang li  WU Jian lin 《保鲜与加工》2001,(5):51-54

An algorithm of fault section diagnosis based on topology identification for distribution networks is presented. By decomposing the topologic matrix which describing the distribution network into two parts,one part only contain the complex coupling factor ,and the other ignore the complex coupling factor. Using this method, the fault zones in distribution network can be identified and isolated efficiently, and the vertexes of the zones can also be identified automatically. This approach adapts to the changefully network structures.  相似文献   

NETWORK FEOW APPROACH TO RELIABILITY EVALUATION IN IARGE SCALE NETWORKS BY MIXING INCREASING ELOW WITH DECREASING FLOW     

Chen HuaZhou Jiaqi 《保鲜与加工》1990,(4):1-6

Based on the maximum flow principle about networks, a network flow approach to reliability evaluation in large scale netwerks ty mixing inereasing flow with decreasing flow is proposed in this paper.This approach gets the initial flow of each branch in a r.etwork associated with a state of the retwork by decreasing flows of some branches correlative to another state of the network.As a result, the number of flow compute required can be reduced enormously.The numerical example shows that the approach is powerful. The comparison of this approach with the minimal cutset one is also given in this paper.  相似文献   

Flow Path Mathematical Modeling of Total Artificial Heart Test System     

ZHENG Xiao-lin  CAO Yong  DENG Xiao-yan  PENG Cheng-lin  LIAO Bin 《保鲜与加工》2007,(10):119-125129

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Research on Cooperative Design Network Security Based on IP-VPN     

FU Hong qiao  HE Yu lin  XIAN Zhi ling  WANG Xu xia 《保鲜与加工》2002,(4):32-35

As the important method and instrument of agile manufacture,the technology of distributed collaborative design and manufacturing has become the hotspot of manufacturing. The basic concept and key technologies of IP_VPN are introduced in this paper,and a collaborative design network model based on IP_VPN is presented. Distributed collaborative design is a multi_user,multitask involved system, which is consisted of lots of collaborative processs,so the network security is the key of distributed collaborative design. We research on the security of collaborative design network based on IP_VPN, hence get a conclusion:we can construct an economical?practical and secure collaborative design network system by the application of data encryption,user authentication and access control based on the role,etc.  相似文献   

Expert System for Artificial Intelligence Blast Furnace Smelting Process     

SHI Jin-liang  JIA Bi  YU Qun-wei  LAN Shou-bing 《保鲜与加工》2005,(5):63

In order to upgrade traditional industry and realize the automation of furnace condition judgement and standardization of operation, an expert system for various furnace conditions and breakdown judgement and operation guidance on blast furnace are developed based on the theory of artificial intelligence and knowledge engineering. The system is fulfilled through C++Builder and combined with the actual production picture. The system has efficient and convenient man-machine interface by using menu operation method. The testing and operation of actual production data in simulation system indicate that the system is exact and reliable and can provide both the warning of various furnace breakdown and corresponding operation guidance.  相似文献   

Artificial Neural Networks Models for Flow Stress during High Temperature Plastic Deformation of Al-Li Alloy     

LIU Xue-feng  WANG Ling-yun 《保鲜与加工》2001,(2):68-71

Using gained experimental data to develop the models of stable flow stresses at high temperature plastic deformation by statistical methods for alloy materials, precision of the models is poor and at the same time the processes of modeling are complicated with great workload. On the basis of the data obtained on Gleeble-1500 Thermal Simulator,the predicting models for the relation between stable flow stress during high temperature plastic deformation and deformation strain, strain rate and temperature for 1420 Al-Li alloy have been developed with BP Artificial Neural Network method. The results show that the model on basis of BPNN is practical and it reflects the real feature of the deforming process. It states that the difference between the real value and the output of the model is in order of 5 percent.  相似文献   

Building Enviornmental Monitoring System With COM     

WANG Ji feng  PENG Dong bin 《保鲜与加工》2001,(4):48-50

This article presents an implement of component using COM technology for collecting environmental monitoring data in environment monitoring system. The component makes the separation of data collection and data analysis available.Simultaneously by using the interface of connectable object in COM,itmakes the cooperation of the environment monitoring software with other parts of fault management software available,and also the seamless connection.It improves the system's performance by adding extensibility and potential cooperatibility.  相似文献   

An Expert System Approach to the Computer Aided Design of Intelligent Controllers     

Tu Yaqing Li Zushu Huang Shanglian 《保鲜与加工》1993,(2):24-29

The idea for an expert system approach to the computer aided design of intelligent controllers (ESCAD1C) is discussed and the idea of two step modelling of an intelligent controller is presented on the basis of emulating human control behaviours to solve complex problems. The structure, functions and characteristics of ESCADTC system , and the design procedures of intelligent controllers are gived. The knowledge base and simulating functions for designing intelligent controllers are also described.  相似文献   

Distribution Network Structure Planning Based on Improved Immune Genetic Algorithm     

YAN Wei  WANG Li-na 《保鲜与加工》2007,(1):28-31

Distribution Network Structure planning is a complex combinatorial optimization problem,which is difficult to solve properly by using traditional optimization methods.In order to solve this problem,Improved Immune Genetic Algorithm is introduced to the distribution network optimal planning. Improved Immune Genetic Algorithm draws into the immune diversity and antibody's density mechanism to maintain the individual's diversity and remains evolution algorithm's global stochastic searching ability,so it can promote diversity and the whole optimal-searching ability of genetic algorithm.The optimal module takes the minimum annual cost as its object,and the capacity and voltage drop of feeder and the radiation of distribution network as its restrictions.According to the require of radiation of distribution network,the spanning tree of the alternative network is taken as the initial solution to speed up the calculation.And the branch-exchange method is used in designing crossover operator and mutation operator to avoid the radiation checking and enhance the optimizing ability.This algorithm has been illustrated effectively by examples,at the same time,the calculation example demonstrates that,the algorithm has higher calculation speed than the traditional immune genetic algorithm.  相似文献