高效转子式选粉机的最佳工况研究

研究不同操作参数对高效转子选粉机性能的影响规律,利用正交实验设计,得到高效转子选粉机的最佳工况.实验结果表明:折叠形式滴流装置可提高选粉效率;转子的转速对选粉机的性能影响最明显,通过调整转子的转速可控制产品的细度.确定选粉机最佳工况:转速为500 r/min,风量为1 750 m3/h,加料速度为10 kg/min时牛顿效率为83.88%.     

速度相同的具有m-2台通用机的两组工件的LS算法分析

对于实践中存在的具有两组任务的优化排序问题进行了讨论,在经典的LS算法的基础上提出了一种改进的LS算法,利用"首先空闲"准则选择机器,按照工件的到达顺序安排工件,讨论了将两组工件安排在两台速度相同的专用机,m-2台同速度的通用机上的Cm ax问题,其中工件具有准备或到达时间,且工件的准备或到达时间均不超过其加工时间的α倍。目标是在最短的时间内完成所有给定的任务。得到了利用该近似算法所得的解TLS与最优解T*的一个估计(1+α)(2-1/m),并且证明了对任意的α此界是紧的。     

基于面元法的轴流泵叶轮敞水性能紊流数值分析

采用改进后的面元法程序对轴流泵叶轮的叶片外特性、表面压力分布和诱导速度场进行性能预估,并和CFX-TASCflow流体计算软件的数值计算结果进行对比.分析结果表明,面元法程序能较好地预测开敞式轴流泵叶轮的水动力性能,计算结果和CFX的预测结果较为吻合.     

Computationally efficient locality-aware interconnection topology for multi-processor system-on-chip (MP-SoC)

This paper evaluates the Triplet Based Architecture, TriBA – a new idea in chip multiprocessor architectures and a class of Direct Interconnection Network (DIN). TriBA consists of a 2D grid of small, programmable processing units, each physically connected to its three neighbors so that advantageous features of group locality can be fully and efficiently utilized. Any communication model can be well characterized by locality properties and, any topology has its intrinsic, structural, locality characteristics. We propose a new criterion in performance evaluation that is based on the concept of locality in an interconnection network, the “lower layer complete connect”. Our proposed criterion depicts how completely a processing node is connected to all its neighbors. TriBA is compared with 2D Mesh and Binary Tree as static interconnection network. The comparison / evaluation is enumerated from three orthogonal view points, viz., computational speed, physical layout and cost. Our analysis concludes that TriBA is computationally efficient interconnection strategy that exploits group locality in processing nodes.     

浅谈如何构建企业科学的绩效考核体系

实现企业人力资本经营,就必须建立科学的绩效考核体系。探讨了各类企业如何构建科学的绩效考核基本体系。     

大、小共同体交锋下的身份松弛——长时段下的经济史考察

按照大空间、长时段整体史的理念构想,中国的经济史可以以春秋战国及唐宋为两个分水岭划分为三截比较长的历史阶段。从汉到唐这一长时段的特点,即是提倡个人人身自由的专制政府以积极的田制手段来遏制承认人身依附关系为前提的世族门阀;而从宋到清这一长时期的特点,则以田制不立为标志,大地主所有制向中小地主所有制转化,民众对于小共同体的依附关系进一步松弛。     

制冷陈列柜性能优化策略的应用

利用改进的双流体(MTF)模型对立式敞开型陈列柜冷风幕及其四周气体流动和传热进行数值模拟,从而确定陈列柜的漏风量.通过MTF得到的结果训练并验证针对漏风量的自适应支持向量机(ASVM)算法,建立陈列柜性能的优化函数.实验测试验证结果表明,优化后的陈列柜融霜后的凝结水质量和单位展示面积每日耗电量分别减少39.2%和19.3%,明显改善了漏风.     

绩效考核在企业中的应用研究——以西山支护器材开发有限责任公司为例

西山支护器材开发有限责任公司是一家由国有企业改制为股份制的企业,过去的管理模式已远远不能适应企业发展的需求。笔者旨在分析原体制下绩效考核低效的原因,以帮助企业建立科学、高效的绩效考核制度。 更多还原     

Performance evaluation of the fixed relay in OFDMA systems

Performance of fixed relays in orthogonal frequency division multiple access (OFDMA) systems, especially the coverage and capacity performance at the cell edge, is evaluated in this paper.Two methods, theoretical analysis and calculation and Monte Carlo simulation, are used for the evaluations.By theoretical analysis and calculation, frequency efficiency equation of a relay is introduced and numerical results are calculated.Monte Carlo simulation results also verify that the calculation method is reasonable.The evaluation shows that a relay can increase system performance to a certain level if it is designed appropriately, otherwise it will be harmful for the system performance, even to reduce it.     

The design analyze of new hybrid drive concept

This paper presents the design method of hybrid drive system for the minibus with some limited conditions. The approach of design hybrid drive system is based on the dynamic modeling and simulation of the hybrid minibus with planetary gear system. The main target of the design is to obtain the optimal design with the proper hybrid drive configuration and control for a given set of design constraints. In oder to meet the design target, it's necessary to adjust some parameters such as mechanical ratios and parameters of battery pack as well as control by simulation. During simulation the transient operating process can be studied in details with the dynamic model in Matlab/Simulink. The control strategy can be optimized by running the simulation and monitoring the operation of each components: the operating area of internal combustion engine (ICE), fuel consumption (energy consumption), the power distribution, the torque and rotary speed of ICE and motor, the operating efficiency of motor, the alteration of battery state of charge (SOC), current and voltage.