Improved Genetic Algorithm and Its Application in TSP

Crossover operator and mutation operator are basic operators of genetic algorithm , which play important roles in improving the quality of the solution populations. We propose the improved crossover operator , mutation operator and rotation operator on the basis of good point set with the traveling salesman problem , the experimental result shows these operators are very efficient.     

Resolvent and Application of Policy Control for QoS

With the rapid increase of the Internet user and widely application of Web,the current network technology is facing great challenge. More and more multimedia operations occupy plenty of bandwidth,and result in the network congestion. Therefore,people begin to use QoS to utilize the bandwidth effectively,and ensure the transport of the emergent operation data. The paper introduces the protocols and basic components of QoS,then expatiates the conception and the basic principles of policy control QoS, moreover,emphasizes the structure model of policy control QoS and how it runs. At last,it introduces the transport process of data packets under the control of policies in a policy control QoS system,and how to make the policies in the real world.     

A Globally Convergent Algorithm for Nonlinear Programming

A new globally convergent algorithm was presented for a continuous differen-tiable nonlinear programming by defining a measure function deviating from the Kuhn-Tucker point. With this algorithm which can be used to get the optimum solution of the problem,the optimal lagrangian multiplier corresponding the optimal solution of the problem was also obtained. A new iterative algorithm for quadratic programming is obtained when applying the general algorithm to quadratic programming. Finally,a numerical example was given.     

THE SIZE EFFECT OF THE FRACTURE ENERGY OF CONCRETE TESTED BY THREE POINT BENDING

This paper ainalyses the size effect of the fracture energy of concrete tested bythree point bending. It is shown that positive errors of test results of fracture energy increase,ornegative errors decrease with increasing of the specimen ize. The phenomenon is one of main causesresulting in the size effect of fracture energy.     

A STUDY ON HEAT AND MOISTURE STATE OF HULL LAYER FOR THERMAL INSTULATION OF A COLD STORAGE

This paper analyses the thermal moist characteristics of the hull layer beside an air layer at lower temperature in an envelope for a cold storage and presents a new method of waterproof by air layer. With test data from engineering practice, the theory on the barrier of self moisture proof at the surface sublayer of the hull layer in an attic on a cold storage is proven. The dried zone about three phase point is confirmed. It is a new knowledge for thermophysics on thermal design of a cold storage with an optimum thermal performance.     

OPTIMAL CONDITIONS OF DIFFRENTIAL MULTIOBJECTIVE PROGRAMMING IN BANACH SPACES

In this paper,by the use of Farkas lemma and its inve-rse proposition,the generalized Kuhu-Tuoker conditions for the existanceof strong minimum point in differential multiobjective programming inBanach spaces and the existance of sufficient condition of weak Paretominimum Foint are derived.     

五轴数控加工叶片无干涉刀位轨迹的计算

根据微分几何特性，提出五坐标数控加工叶片时对叶片的工作面和背面的刀位轨迹计算分开予以讨论，对工作面而言，利用平头立铣刀加工时不存在干涉，而对背面而言，可能存在干涉。根据干涉的种类，分别对全局干涉和局部刀具干涉提出了快速判定依据，并对干涉点进行了修正。指出利用Iso-scallop法可获得最优的轨迹和蔗，并给出了实例。     

高效产氢发酵细菌在不同气相条件下产氢

气相条件是影响高效产氢细菌产氢能力的重要生态因子之。间歇实验结果表明，空气中的氧分子是抑制高效产氢细菌－B49生长发酵的直接原因，二氧化碳也对B49的发酵产氢产生很大的抑制作用，而以氮气和氩气为气相能使B49发挥较高的产氢能力，氮气很可能对B49的发酵产氢有一定的促进作用。     

关于我国节水农业技术研究的探讨

总结了我国近期节水农业技术研究在农用水资源的合理开发技术、输配水节水工程技术、田间节水灌溉工程技术、提高作物从农田土壤中获取水分形成产量的技术等方面的最新进展。指出了我国节水农业技术研究中存在的主要问题。提出了我国节水农业技术应研究的重点为 :适合我国国情的节水灌溉工程技术 ,研究新工艺、新配方加速节水农业新设备及新材料的产业化 ,节水高效灌溉制度与控制灌溉技术 ,研究开发多种可用于灌溉的水资源 ,研究提高灌溉用水管理水平。