Optimality Conditions for Nonsmooth Extremum Problems in Topological Vector Spaces

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.     

An Analysis on China Neutral Technological Progress by Embodied Spillovers from North America

This paper empirically discusses the mechanism of China Neutral Technology by Embodied Spillovers from North America, and the effect on China economic growth. The simulations show that the effects of technology spillovers on both the innovating and the receiving economies depend on SS and AC. The three sectors spillovers of North America can improve China's Hicks-neutral technological progress, but only the third industry can increase the output of same industry of China, and decrease the output of other two industries. Based on the simulations, some advices are given on China trade policy.     

An EOQ Model at Random when Average Demand Is a Linear Increasing Function

For certain types of inventory, the ordering cycle and demand may be random variants, which satisfy certain types distribution. The classical EOQ model usually neglects the fact. Based on the constant demand, under the hypothesis that the ordering cycle is a random variant which satisfies exponent distribution, average demand is a linear increasing function, this paper considers the effects of the time-value of capital and inflation on replenishment strategy of inventory system. Loosening the condition of basic economic order quantity model under deterministic state, the total cost function of the model is provided. The optimum order quantity and cycle are obtained. The application range of EOQ model under the constant demand is widened. The theoretical evidence is provided for the inventory system to make management decision.     

金丝慈竹在南京生长表现及其应用潜力

通过对引种在南京的南方丛生竹种金丝慈竹长达10 a的野外生长、繁殖等特性观测发现,目前金丝慈竹生长良好,胸径最大达到4 cm,高超过10 m,成为南京及周边地区所见最为高大的丛生观赏竹种,其在园林绿化方面的应用很具潜力.     

Heating performance analysis of multi-nozzle water-jet steam ejector

Abstract:This paper developes a heating coefficient model to study the heating performance of multi-nozzle water-jet steam ejector. It analyzes the factors of heating performance, and explores the relationships between the heating performance and different operating parameters theoretically and experimentally. The results show that the heating performance of multi-nozzle water-jet steam ejector is very good. The heating coefficient decreases with the increase of the inlet water temperature, and increases with the increase of the steam pressure and ejecting coefficient. The relationships between heating performance of ejector and different operating parameters by calculation and experiment are in good agreement.     

从养蚕型式的变革看养蚕发展方向

<正>养蚕型式从普通育发展到覆盖防干育、炕床（房）育、条桑育,及由平面育发展到小蚕立体育、小蚕人工饲料育等饲养型式,使给桑回数由1日8回以上降到1～3回,并采用省力化养蚕技术,大大降低了劳动强度,促进了蚕桑生产的发展,这种变革符合经济发展规律,势在必行。 我国的养蚕技术有着几千年的悠久历史,但历来养蚕都是以蚕的营养为中心,人围着蚕转。为了使蚕儿能吃饱、吃好、不分昼夜地喂蚕,见蚕将桑叶吃光后就喂叶,因此一日之中给桑喂蚕次数多达8回以上,这种以营养为中心的传统饲养方法,一直沿用到20世纪50年代。随着生产力的发展,科学技术的进步,对蚕的生理和营养要求也逐渐了解养蚕技术也由此而发生了一系列的变化,特别是随着改革开放,由传统农业向现代农业转化,计划经济向市场经济的转化,进一步促进了养蚕型式的变革。 50年代以来养蚕技术并不是停顿不前,     

The optimal energy efficiency of wireless networks nodes based on solar cells

To improve the energy efficiency of solar cells in wireless sensor networks nodes, the energy relationship between solar cells and the wireless sensor networks nodes is studied. An adaptive algorithm is adopted to ensure the wireless sensor networks work normally at different sunlight intensities. An energy model is designed that reveals the energy relationship between the output power of the solar cells and the power of nodes working normally at a standard sunlight intensity. The experimental results show that the model represents the adaptive energy relationship between the solar cells and the nodes, ensures that the nodes work stably in a long term, and extends the life cycle of the sensor networks as long as possible. The model has important guiding significance for wireless sensor networks designation.     

Experimental research on heating performance of jetting mixing low pressure heaters

This paper conducts the experimental study on the performance of steam water two phase flow device composed by a nozzle,mixing chamber and the corresponding valves when the inlet steam pressure is in the range of 0.18~0.22 MPa．The experimental results show that the injector can run stably and reliably and the temperature of outlet water is increased obviously in low inlet steam pressure．This characteristics can be used as effective heaters in the engineering fields such as power plants,heating,the light industry, etc． When a single stage ejector can not meet the requirements of heating conditions, double stage ejectors can be used.