体育产业化对高校体育发展的影响

体育产业化是把整个体育事业由福利型向消费型的转化过程,其核心是把我国的体育事业从计划经济转向市场经济.我国体育产业化的产生和发展给高校体育的发展带来挑战和机遇,主要体现在促使高校体育向产业化发展,加快了高校体育与社会体育的接轨;体育产业人才的短缺,为高校体育专业教育提供了机遇;改变了高校体育教学的内容布局.     

电路课程教学实践的探索与研究

本文着眼于培养学生独立思维与创新能力就目前高校电路教学实践的课程内容与教学方法进行了研究,针对目前电路知识结构体系,重点对项目法、演讲法、设计法、实地考察法等教学方法进行了探讨,同时给出部分教学案例.最后论述了计算机辅助教学手段的利弊.对电路教学实践有一定的指导意义.     

自学考试“助学二学历”优化管理探究——以南京农业大学为例

南京农业大学作为首批"助学二学历"试点单位之一,自2010年起,在本校范围内积极开展了"助学二学历"教育工作。经过几年的实践与探索,积累了丰富的教学管理经验,同时也取得了一定的成果。本文基于南京农业大学实践经验,分析了"助学二学历"开展的现状及存在的问题,提出了增强宣传力度,提高普及水平;立足学生需求,增设优势专业;加强组织建设,完善管理体系;重视过程管理,保障教学质量等策略。对自学考试"助学二学历"优化管理进行探讨,有利于高校推进自学考试事业的发展,培养复合型人才,更好地满足社会对人才多样化需求。     

Comparison of Physical Isolation on Large Active Area Perovskite Solar Cells

To reduce the quadratic scaling of the series resistance(R_s) and sheet resistance(R_st) of the devices, physical isolation of the large area devices into small pieces has been proven to be a reliable and cost-efficient patterning technique. In this paper, we got an interesting result that the physical isolation did not show obvious effect on the photovoltaic performance of perovskite solar cells(PSCs) when fixing the active area. Three different isolation types, unetched ITO, etched ITO, and laser etching whole devices, have been induced to investigate the physical isolation roles. The results show that the electrons and holes could be collected efficiently in active area for all the isolation types. The proposed mechanism illustrates that the nonradiative recombination and recombination of electrons and hole in inactive area do not influence the performance of devices. This work may open a new way for the commercialization of PSCs by reducing the complex process and the etching costs.     

Dantzig–Wolfe decomposition of the daily course pattern formulation for curriculum-based course timetabling

In this paper, we considered the problem of Curriculum-Based Course Timetabling, i.e., assigning weekly lectures to a time schedule and rooms. We developed a Column Generation algorithm based on a pattern formulation of the time scheduling part of the problem by Bagger et al. (2016). The pattern formulation is an enumeration of all schedules by which each course can be assigned on each day; it is a lower bounding model. Pattern enumeration has also been considered in Burke (2008), where the authors enumerated all schedules to which each curriculum can be assigned on each day. We applied the Dantzig–Wolfe reformulation, so each column corresponded to a schedule for an entire day.We solved the reformulation with the Column Generation algorithm, where each pricing problem generated a full schedule for a single day. We provided a pre-processing technique that, on average, removed approximately 45% of the pattern variables in the pricing problems. We then extended the pre-processing technique into inequalities that we added to the model. Lastly, we describe how we applied Local Branching to the pricing problem by using the columns generated in previous iterations.We compare the lower bounds we obtained, with other methods from literature, on 20 data instances of real-world applications. For 16 instances the optimal solutions are known, but the remaining four are still open. Our approach improved the best-known lower bound for all four open instances, and decreased the average gap from 24 to 11%.     

基于专业课程培养本科生创新精神和科研能力——以无机合成化学为例

以无机合成化学为例进行了基于专业课程培养本科生创新精神和科研能力的教学方法改革,探索以专业课程为载体加强本科生创新精神和科研能力的培养,提高学生在学习中的主体地位,培养勤于思考、敢于怀疑、勇于创新的素质和精神,提升科研能力,形成终身学习的能力和习惯。教学改革取得了一定的成效。     

Calculation of acoustic scattering of a nonrigid surface using physical acoustic method

In this paper the physical acoustic method or the Kirchhoff approxima-tion is extended to treat the scattering of a nonrigid surface in order to estimatethe target strength of targets with absorbing coatings.By using the locally planewave approximation,the relationship between the sound pressure and its normalderivative on the surface can be represented by the plane wave reflectioncoefficient and the acoustic impedance of the surface.The resulting modifiedKirchhoff approximation involves the plane wave reflection coefficient.For aimpedance sphere,a comparison between the physical acoustic method and theexact solution shows that the physical acoustic method still is a good approxima-tion at higher κα values.     

慢电子与原子,分子碰撞的理论研究

艹勾清泉教授建立的慢电子散射物理模型被广泛用于研究电子、正电子与原子、分子碰撞，通过三十多年的研究实践证明艹勾清泉教授慢电子散射物理模型是成功的     

整合环节,加强能力——"微机原理与接口技术"教学改革与思考

针对一般院校电类专业的特点,以增强综合应用能力、素质教育为目标,结合我院教学实践,通过对现行教学中的课堂教学、实验、课程设计等环节某些内容的整合,提出了关于微机原理与接口技术教学改革的一些看法。     

The fleet size and mix problem for capacitated arc routing

There have been several attempts to solve the capacitated arc routing problem with m vehicles starting their tours from a central node. The objective has been to minimize the total distance travelled. In the problem treated here we also have the fixed costs of the vehicles included in the objective function. A set of vehicle capacities with their respective costs are used. Thus the objective function becomes a combination of fixed and variable costs. The solution procedure consists of four phases. In the first phase, a Chinese or rural postman problem is solved depending on whether all or some of the arcs in the network demand service with the objective of minimizing the total distance travelled. It results in a tour called the giant tour. In the second phase, the giant tour is partitioned into single vehicle subtours feasible with respect to the constraints. A new network is constructed with the node set corresponding to the arcs of the giant tour and with the arc set consisting of the subtours of the giant tour. The arc costs include both the fixed and variable costs of the subtours. The third phase consists of solving the shortest path problem on this new network to result in the least cost set of subtours represented on the new network. In the last phase a postprocessor is applied to the solution to improve it. The procedure is repeated for different giant tours to improve the final solution. The problem is extended to the case where there can be upper bounds on the number of vehicles with given capacities using a branch and bound method. Extension to directed networks is given. Some computational results are reported.