Theory Analysis of Model for Price Fluctuations in a Single Commodity Market

The price model for a single commodity market is a very important economic model that describes the basic rules for price fluctuations in a single commodity market. In this paper, we investigated the general case for the model, and proved that every positive solution is bounded and we obtained a necessary and sufficient condition for oscillation of every positive solution concerning positive state solution.     

机载机柜的隔振设计

针对机载电子设备所处的振动环境,结合振动理论,阐述了一种机载机柜隔振设计的方法.该方法有助于提高系统的抗振能力.     

广州降水与太阳活动及ENSO的关系

文章通过相关性计算得出,太阳黑子对广州降水的影响比南方涛动对广州降水的影响显著,相关系数分别为0．507和0．388,都通过了99％的显著性检验。同时,统计了1950年以来的ENSO事件,并与广州降水作了对应分析。得出结论,ENSO暖事件将使广州降水量减少;相反,ENSO冷事件则使广州降水量增加。     

A tabu search heuristic for redesigning a multi-echelon supply chain network over a planning horizon

This paper addresses the problem of redesigning a supply chain network with multiple echelons and commodities. The problem belongs to a comprehensive class of network redesign problems previously introduced in the literature. Redesign decisions comprise the relocation of existing facilities to new sites under an available budget over a finite time horizon, the supply of commodities by upstream facilities, the inventory levels at storage facilities, and the flow of commodities through the network. The problem is modeled as a large-scale mixed-integer linear program. Feasible solutions are obtained by using a tabu search procedure that explores the space of the facility location variables. The latter prescribe the time periods in which changes in the network configuration occur. They are triggered by the setup of new facilities, which operate with capacity transferred from the existing facilities, and by closing the latter upon their entire relocation. As the problem is highly constrained, infeasible solutions with excess budget are allowed during the course of the search process. However, such solutions are penalized for their infeasibility. Computational experiments on realistically sized randomly generated instances indicate that this strategic oscillation scheme used in conjunction with tabu search performs very well.     

地感线圈在车辆通行自动检测控制系统中的应用

本文对基于地感线圈的车辆通行自动检测控制系统进行了研究。由于线圈电感量的变化,使得由三点式LC振荡电路构成的检测电路输出的波形频率发生变化,再经过波形整形电路送入单片机,单片机检测到频率变化来控制电机运转。采用这种方法可以使得当有车辆经过时,挡车器可以自动抬升档杆。而且当杆下有车辆时可以及时停止落杆,防止砸中车辆。具有较高的实用价值和应用前景。     

人工中度地震试验后钢筋混凝土桥墩的抗余震性能

通过中度人工地震试验,对试样的三个参数：横向约束、纵向钢筋互搭接头和加纤维增强聚合材料进行测试,并采用测量位移,弯曲和吸收能量的办法,对中度地震后的钢筋混凝土桥墩的抗震性能作出的评估。     

基于质量摆动的供应链质量控制与协调研究

本文在供应商产品质量摆动的情况下,研究产品有缺陷的二级供应链的质量控制与协调问题,通过建立质量分散合作模式和质量集中决策模式,得出两者在合适的契约条件下可以达到相同效果,并给出了质量契约参数与双方的策略选择和终端质量水平的互动机制。结果显示：供应商的质量惩罚越严厉,制造商承担的顾客损失比重越大,线性转移支付的比例越低,终端产品的质量水平就越好。     

基于平衡计分卡的高校横向科研管理研究

本文针对高校横向科研中存在的问题,运用平衡计分卡理论构建了高校横向科研绩效评价体系,制定了相应的战略实施计划和战略地图,旨在提升高校横向科研综合实力。     

秦安隧道2#横洞下穿G310国道施工技术

秦安隧道是宝兰客运专线的重点工程并被建设单位列为I级风险管理隧道,该隧道2号横洞下穿G310国道,施工难度大、安全风险高。通过对秦安隧道下穿G310国道的综合施工技术总结,为其他隧道下穿公路施工技术提供了一定的参考依据。     

关于横向荷载作用下压弯构件的等效弯矩系数的研究

针对横向荷载作用下的压弯构件进行稳定分析,提出了当端弯矩不等时等效弯矩系数的最优解,特别有利于抗风柱等一类构件的稳定分析。