TRUST REGION METHOD FOR UNCONSTRAINED OPTIMIZATION

A new trust region algorithm is proposed for solving unconstrained optimization problems. According to the quadratic approximate model of the original optimization problem,the trust region algorithm uses directions,a convex combination of the quasi-newton direction and the steepest descent direction. This algorithm with new strategy is analyzed and the global and local quadratic convergent theorems are proved. At last,the implementation and computational results of the algorithm are demonstrated.     

A Study on the Practical Algorithm for One Dimensional Equal Stock Cutting Problem

Based on alalysing the mathematical models for one dimensional equal stock cutting problem,a knapsack column generation algorithm has been constructed,which is a successive approximate algorithm for the practical engineering.In the end of this paper,some computational examples have been presented,which show that the convergence and optimum results of the algorithm are quite good.     

The Generalized Conjugate Direction Method for Constrained Optimization A Geometrical Approech

The conjugate direction method for solving the unconstrained optimization problem is extended to solving the constrained optimization problem by method of differential geomtry.By inducing a new class of affine connections on a constrained sub-manifold, the primary constrched optilnhation problem is converted to a unconstrained local quadratic programming problem.Based on the definition and construction of a new class of generalized conjugate directions, it isproved that optimum value of the primary constrained optimization problem must be located on thegeodesic line which is formed by the conjugate directions mentioned above and can be reached withinfinite searching step. Therefore a new curve search algorithm with generalized conjugate directions isput forward.     

A NEW APPROACH OF OPTIMIZATION

In this paper, a necessary optimality condition of problems with equality constraints is investigated by the implicit function theorem in n-dimensional Euclidean space. A new approach solving these problems is obtained. The number of dimensions of corresponding system of equations is less than the classic Lagrangian multiplier method.     

Stability Ishikawa Iteration Procdeure for Strongly Pseudocontractive Operator and Strongly Accretive Operator Equations

By virtue of some analysis techniques,it is proved that certain ishikawa iteration procdeure with errors are stable with respect to strongly pseudocontractive operators in real Banach space. A related result deals with stable iteration procedures for solution of the nonlinear equation of strongly accretive operators. The results presented extend and improve the corresponding by Osilike,Zeng, Chidume, Deng, Liu,et al.     

A STUOY ON TNE POLICYMAKING MODEL OF INVEST IN THE INDUSTRIAL PROJECTS TO BE INUNDATED IN TNE RESERVIOR AREA OF THE THREE GORGES PROJECT

In combination with the migration of industrial projects to be in undated in thereservior area of The Three Gorges project, a level analysis apptoach is used to formulate a policy-making model of invest optimization for the projectS to be migrated,in which various kinds of influ-encial factor on the projects are presented quantitatively and the restriction of limited resourccs isconsidered; An effective,overall and aaplicablc policymaking approach is provided for the migrationof the Three Gorges project.     

A Reactive Power OptimlZation Method by Linear Program ming with Secure Correction

This paper presents a reactive power optimization method which combines thelinear programming model with secure correction. In correction. this mOdel presents a new idea inwhich the feasible control region of con trol variables is resolved by over constrained state varlables. This method is quick and reliable and overcomes oscillation of a general linear programming model.     

不同配比改良材料对典型城市绿地土壤物理性质的影响

选择土壤物理性质退化的典型绿地——上海辰山植物园,进行不同配比改良材料的现场试验,结果显示:与对照相比,不同配比改良材料能显著改善土壤物理性质;并以配比3(土︰绿化植物废弃物︰有机肥=8︰3︰0.8和0.5 kg/m3脱硫石膏)改良效果最好,其土壤体积质量最低,土壤含水量、饱和持水量、田间持水量、非毛管孔隙度、毛管孔隙度和有效水含量最高,土壤饱和导水率也达到良好水平。在30、90和180天的试验时间内,同一配比土壤物理性质较稳定;各配比土壤水分特征曲线均较好拟合Gardner模型(R20.9)。砂虽能增加土壤导水率,但对绿地土壤物理性质改良综合效果不及绿化植物废弃物或草炭等有机材料;而脱硫石膏对土壤各物理性质的改良作用随试验时间延长,其作用越来越明显。在所有改良材料中,以有机材料和脱硫石膏混合使用效果最佳。     

稳态烟雾机烟化管结构参数对烟化效果的影响

以稳态燃烧器为热动力的车载式烟雾机针对农林业病虫害防治具有防治效率高、用药量少、防治成本低等突出优点,烟化管结构参数是影响油溶剂农药能否有效烟化的关键因素。该文设定3种药喷头类型、6个喷头放置位置、3种喷头结构参数以及3个不同直径的双层喷管,分别进行烟化效果试验及分析。结果表明环形喷头烟化效果最好,圆锥形喷头和圆柱形实心锥喷头则出现喷管出口滴液及烟雾中存在明火等烟化不良问题,圆锥形喷头烟化效果好于圆柱形喷头;热雾剂在Φ70 mm喷管内能完全烟化,烟雾雾滴均匀细小,而Φ90和Φ110 mm 2种喷管则会产生较小烟雾和较大雾滴2个分布区,烟化效果不良;环形喷头置于喷管内距喷管喷口250~350 mm的范围内,可获得较好的烟化效果;环形喷头的结构参数如药液出口方向、喷药孔径和孔数对热雾剂的烟化效果影响非常小,均能使热雾剂得到完全烟化。说明药喷头类型和喷管直径是影响稳态燃烧烟雾机烟化效果的关键因素,喷头放置位置是影响的主要因素,而环形喷头结构参数是影响的次要因素。     

斜插式嫁接机砧木子叶气吸夹结构及作业参数优化试验

针对目前插接式瓜类自动嫁接机作业过程中,砧木夹持采用的压苗机构,普遍存在机构复杂、机构动作耗时影响作业生产率等问题,开发了一种砧木子叶气吸夹。该文以瓜类嫁接生产中常用的黑籽南瓜砧木标准苗和黄瓜接穗标准苗为作业对象,通过砧木子叶展平特性测定和气吸夹结构与作业参数优化试验研究,确定了气吸夹的优化结构与作业参数,并在2JC-600B型斜插嫁接机上进行了带压苗机构砧木夹与砧木子叶气吸夹性能对比试验。结果表明:在气源工作压力0.25 MPa、吸孔直径4 mm、吸孔距生长点距离30 mm时,气吸夹展平子叶成功率可达100%;与压苗机构砧木夹相比,采用气吸夹可减轻操作者熟练程度对嫁接机作业性能的影响,提高子叶展平成功率和嫁接成功率,对于熟练操作者,在满足嫁接作业质量要求的情况下可减少砧木上苗作业时间1 s,使嫁接生产率由514株/h增至600株/h,提高16.7%。该研究结果可为斜插式嫁接机的开发设计提供参考。