供应链中的时滞

研究供应链中时滞对长鞭效应的影响 .建立了供应链的多级库存控制系统模型 ,给出了其系统方框图及传递函数 ,求出了使整个供应链稳定的临界条件 .指出长鞭效应产生的原因是由于在系统时滞及系统增益的共同作用下使得供应链中各子系统产生衰减振荡或发散振荡的结果 .最后提出了减弱长鞭效应的四种方法.     

河成石灰华成因──掺气效应研究

本文通过对有大量碳酸钙沉积河段的水质分析、野外观测，发现河水流动过程中将空气带入水中形成大量气泡，引起水体物化方面的迅速变化，包括碳酸钙大量沉积，笔者称之为掺气效应。通过野外实验，对掺气效应及掺气效应中水体物化变化和碳酸钙沉积速度进行了论证和研究，在此基础上提出：掺气效应是河流中碳酸钙大量集中沉积的一个主要因素。     

半导体器件中的量子隧道效应

利用隧道效应器件的量子力学理论 ,说明了隧道效应电子在势垒区内部的行为 .     

成本在心中效益在手中--山西汾西矿业(集团)水峪煤矿有限责任公司成本管理浅析

从材料的消耗，电力的消耗，管理费用的控制3个方面阐述了成功的成本管理给企业带来的经济效益，指出降低成本是企业力求发展的重要途径，管理是企业永恒的主题。     

Orthogonally linear polarized lasers(Ⅰ)--principle and devices

Two kinds of orthogonally polarized lasers, i.e. Zeeman dual-frequency lasers and four-frequency ring lasers (laser gyros) have been developed since the invention of lasers, in which circularly polarized lights oscillate. This paper summarizes recent progress of the study on orthogonally linear polarized lasers with the standing wave cavity. Firstly, the expression of producing orthogonally linear polarized lights in standing wave cavity, i.e. laser frequency splitting, is given. Almost all the birefringence effects made in laser cavity are used to produce orthogonally linear polarized lights. The effect includes quartz crystal birefringence effect, calcite birefringence effect,stress (photo-elastic) birefringence effect and electro-optical birefringence effect. Secondly, several physical phenomena of orthogonally linear polarized lasers are discovered such as aberrance of frequency splitting curves caused by optical activity of quartz crystal, order-passing of longitudinal modes with frequency splitting and strong modes competition. Finally, because the traditional Zeeman dual frequency laser cannot output frequency difference larger than 3 MHz, the approaches of obtaining larger frequency difference are studied. The sequential results, several kinds of orthogonally polarized lasers, are described, such as birefringence dual frequency lasers outputting a frequency difference from 40 MHz to hundreds of megahertz, birefringence-Zeeman dual frequency lasers outputting a frequency difference from 1 MHz to hundreds of megahertz, the LD pumped YAG birefringence dual frequency laser outputting frequency difference of several gigahertz, and the lasers whose longitudinal mode spacing is c/4L instead of c/2L.     

双势阱分子自发隧道效应的研究

用解析法对双势阱分子的自发隧道效应进行了研究,得到了粒子的自发隧道效应周期与能级裂距成反比关系,从而对隧道效应对双势阱分子激发态的稳定性贡献给予了积极的肯定.     

浅谈高校后勤社会化的财务核算

随着高校后勤改革的不断深入，高校后勤将逐渐从学校脱离，成为相对独立的经济实体，而原有高校的财务管理核算体制已不适应后勤改革的需要。     

规范经济行为是珠江上游生态建设的根本途径

江河上游的规划和治理是建设生态环境的基础和关键。珠江上游生态环境建设要从规范现实经济行为入手，以便遏制日趋恶化的生态环境，进一步拓展生态环境对经济发展的承载能力。规范珠江上游各经济主体的行为，要以可持续发展观为价值标准，以分析实际情况为出发点，采用切实可行的对策措施。     

高职思想品德课案例教学效果的显现化

高职思想品德课的现代案例教学的效果显现化,可以帮助和指导学生思想品德的发展。对思想品德课效果显现化的内容应包括认知目标、情感目标、心因目标,其显现化的手段已不能用简单、传统的“考试”来测评,而应考虑用一些更综合的方式进行。