Molecular response and developmental speculations in metamorphosis of the veined rapa whelk,Rapana venosa     

Pu SHI  Hao SONG  Jie FENG  Meijie YANG  Zhenglin YU  Zhi HU  Cong ZHOU  Haizhou LI  Tao ZHANG 《Integrative zoology》2023,18(3):506-517

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灌溉渠系流量最优调配的0-1规划模型     

王智  朱凤书 《灌溉排水学报》1992,(3)

本文根据灌溉配水渠系的运行特点,提出在一定轮期和来水流量限制条件下实现下级配水渠最优组合及其配水时间最优排序的一种0-1规划模型,实例运算表明,这种方法可有效减少无效弃水和闸门调节次数,同时对渠道横断面的设计有参考意义。  相似文献   

甘蓝型油菜雌性不育突变体FS1花器官形态结构研究   总被引：1，自引：0，他引：1  

陈新军  戚存扣  张洁夫  浦惠明  高建芹  傅寿仲 《作物学报》2005,31(9):1239-1240

植物界中雌性不育现象普遍存在，迄今已在小麦、水稻、苎麻、油松、桔柑等作物中发现了雌性不育突变体^[1~5]，并对雌性不育的机理、遗传、应用进行了研究^[6~11]。1996年我们在油菜育种圃甘蓝型黄籽油菜宁油10号株系中发现了3株异常株，每株只结几个角果，角果肥大且角粒数只有1~5个，后来研究证实为雌性不育突变体，定名为FS1。雌性不育系作父本与母本混播，应用于杂交油菜制种可缩小父、母本间传粉距离，增加母本播种量，从而提高制种产量和纯度。初步研究表明，FS1天然授粉、套袋自交、剥蕾自交结角率为3%左右，平均每角粒数为1.30-2.07粒，其雌性不育性可以遗传，花粉育性正常，体细胞染色体数正常，为2n=38，花粉母细胞减数分裂正常（有关研究另文报道）。为了解甘蓝型油菜雌性不育突变体FS1的雌性不育机制，本文从形态结构方面做了初步研究。  相似文献   

Existence of an Arbitrage about Portfolio in an Unequilibrium Market     

FU Qiang  PU Xing cheng 《保鲜与加工》2001,(5):123-126

This article has discussed the problem of an arbitrage about an portfolio in an unequilimarket and got a determinable theorem about existence of an arbitrage about an portfolio. According to this theorem,an arbitrage about portfolio is not existing if there exists a respect martignal measure.A structural result about existence of arbitrage about an portfolio in a market is gotten. All results represent the existence of an arbitrage about an portfolio is related closely to the type of market.  相似文献   

Human Simulated Intelligence Motion Control for Three-link Acrobot on Horizontal Bar     

ZHANG Hu  LI Zu-shu  GU Jian-gong  CHEN Gui-qiang  TAN Zhi 《保鲜与加工》2007,(3):74-78

The design of multi-controller and multi-mode control law is presented for the three-link Acrobot on horizontal bar by employing Human simulated intelligent control method based on sensory-motor Schema.Imitated the characteristics of gymnast's swing-up and handstand movement,the control process of robot is divided by six sequence phase.Then the sensory cell and motor cell and the group of sensory-motor schema is designed based on the analysis of quality-quantity combination.The simulation results show that the controller ensures the gesture and the energy to the desired goal,farther more the motion control of giant swing backword is realized in the simulation.  相似文献   

Industry Experiment on Parameter Optimizing of Final Electromagnetic Stirring     

LIN Guo-qiang  XIE Zhi  YU Xiao-fang  LI Jun  KONG Fan-jie  JIA Guang-lin 《保鲜与加工》2007,(9):56-59

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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   

Study on Design of Bio-clean Operating Room     

YANG Zhi wei  LI Bi yu 《保鲜与加工》2001,(4):20-25

The design of Bio-clean operating room in modern hospital is quite different from that of traditional operating room. This paper discusses three aspects of Bio-clean operating room design: air clean standard and air purification, interior equipment system and interior finish. It is hoped that this discussion will conduce to later designs.  相似文献   

Conditional Value-at-Risk and Its Use in Credit Risk Measurement of Banks     

GU Xu  PU Yong-jian  YONG Shao-hong 《保鲜与加工》2004,(11):125-127133

Credit risk, the major risk of bank, is more and more intense during the period of economic restructuring in China. In view of the flaw of present risk measurement system, Conditional Value-at-Risk is used for the credit risk measurement which is better than Value-at-Risk. This paper creates the model ,while gives the method and procedure for solving it. So CVaRof credit combination is produced, which is just the early warning value of credit risk. At last, it is concluded that the CVaRrisk measurement is too difficult to use widely at present in china, then some advice is provided.  相似文献   

Optimality Conditions for Nonsmooth Extremum Problems in Topological Vector Spaces     

CHEN Xiu su  XIAO Zhi xiang 《保鲜与加工》2002,(4):47

Some new concepts of coneD_s convexity,coneD-s quasiconvexity,cone D-s pseudoconvexity,s right derivative of vector value mapping are proposed;and their related properties are discussed;the optimality necessary conditions and sufficient conditions for constrained extremum problem(VP)involving in cone D-s convex mapping are extablished;the relation between local optimal solution and global optimal solution;as well as the relation between weakly efficient solution and efficient solution for (VP) are derived;the corresponding results generalize the related results of classic convex programming.  相似文献