国有公路运输企业改革创效的现实选择

通过对公路运输企业经营实践的考察 ,介绍了国有公路运输企业改革创效的一些现实选择 ,以供运输公司经营借鉴 ,从而摆脱困境 ,取得良好业绩     

Paul阱中共线两离子量子力学问题

运用熟知的级数截断方法,设计程序计算了线性Paul阱中两离子量子门系统Schr(o)dinger方程的精确解,分析了质心波函数几个较低能级的态,并作出对应的几率分布图;计算相对距离的方均差△r2＞(h)/2,相对运动的动量方均差△p2＜(h)/2,并满足量子力学的Heisenberg不确定度关系△r.△p＞(h)/2,它满足压缩态的条件,即质心处于基态时,两离子相对位置的量子态是一个压缩态,并得到了两离子纠缠态的表达式.纠缠的存在对量子计算和量子信息有影响,量子测量的不确定度和纠缠是在实验中应加以考虑的问题.     

Impact of the addition of an enzyme pool on an activated sludge system treating dairy wastewater under fat shock loads

BACKGROUND: The application of lipase‐rich enzyme pools (such as the crude solid enzymatic preparation (SEP) obtained from Penicillium restrictum solid‐state fermentation of agro‐industrial wastes) to activated sludge systems may be an effective strategy for preventing various operational problems. The continuous addition of SEP to the treatment system can become cost‐prohibitive when in situ production and/or storage are factored in. The application of SEP to high‐fat wastewater treatment would only be justified as an emergency measure, such as a sudden increase in the fat content of the bioreactor influent. Therefore, the primary objective of this work was to investigate the efficiency of a crude SEP during fat shock loads, simulated through the periodic addition of dairy industry waste containing high fat concentrations to the feed stock of an activated sludge system, operated in continuous mode. RESULTS: The test bioreactor exhibited a higher average chemical oxygen demand (COD) removal efficiency than the control bioreactor (83% for control and 90% for test) and the fat accumulation in the biological flocs of the test bioreactor was 3.2 times lower than that in the control bioreactor. Turbidity was also lower in the effluent of the test bioreactor (123 and 66 FTU in control and test, respectively) and it had a shorter recovery time between shock loads, especially when the interval between loads was shorter than one month (biweekly and weekly shock loads). CONCLUSION: The addition of SEP during fat overloads in the reactor feed maintained efficient COD removal in the test bioreactor for 270 days without any operational problems. Copyright © 2008 Society of Chemical Industry     

欠驱动系统Pendubot的模糊控制策略

本文针对欠驱动Pendubot机器人系统，提出一种简单可靠的摇起及平衡控制策略。通过利用模糊控制及全状态反馈控制技术来分别设计摇起控制器及平衡控制器，其中模糊摇起控制器的设计使得系统的摇起可靠性得到大大的加强，并缩短了响应时间，两个控制器的转换通过转换装置实现。最后的仿真结果验证了算法的有效性。     

Connecting the second exhaust-heat boiler to the operating first one under the conditions of flow circuits of combined-cycle plants with two gas-turbine units and one steam turbine

Problems arising with connecting the second exhaust-heat boiler to the first exhaust-heat boiler under load in the case of flow circuits of combined-cycle plants of type PGU-450 are considered. Similar problems exist for two-boiler single-turbine units of type PGU-325 and for two-boiler single-turbine units of traditional steampower plants with an output of 200–300 MW upon connection of the second furnace of a two-furnace boiler to the operating first furnace. Analysis of the temperature-induced stressed state and of the cyclic strength of thick-walled elements of the steam-water conduit of PGU-450 and of two-furnace boilers of two-boiler single-turbine units with an output of 200–300 MW (the check valve, the inlet header of the water economizer) is used for determining the steam temperature differences in the high-pressure conduits to the steam turbine and the order of connection of the second exhaust-heat boiler to the operating fist one. Modes of enabling a two-boiler single-turbine unit of a combined-cycle plant, which are most “rigid” from the standpoint of thermal strength, are determined. __________ Translated from élektricheskie Stantsii, No. 2, February 2006, pp. 11–17.     

高炉富氧鼓风的现状及机前供氧

阐述了高炉生产采用富氧大喷煤的必要性，国内高炉富氧鼓风的现状，以及机前富氧的优点和应采取的安全措施。     

一类关于鲁棒性和敏感性的泛函的优化

本文给出了一类泛函的优化方法.这类泛函包括反映系统鲁棒性和敏感性的目标函数. 其优化是通过-Rm×n→Rm×n的映射来实现的.该映射将所有配置系统极点的反馈矩阵参数 化为一自由矩阵变量的函数.     

多台并行随机CIMS可靠性的扩散估计界

ＣＩＭＳ可靠性模型随机研究的突出特点是工作站的并行结构使系统的状态个数呈现指数级增大，同时，并行结构与有限的缓冲库相互交织在一起，这使系统状态呈爆炸趋势，显然，对系统作精确的分析与系统呈现的状态爆炸趋势构成了难以解决的矛盾，如何解决这一矛盾正是ＣＩＭＳ随机理论有待开发的重要课题。我们把扩散近似方法引入到多台并行的ＣＩＭＳ可靠性模型中，以简单的连续过程描述了具有状态爆炸趋势的复杂离散过程，给出了ＣＩ     

受控离散事件过程（CDEP）的一种代数分析方法

本文在文［１～３］的基础上，提出了受控离散事件过程（ＣＤＥＰ）的一种代数分析方法，弥补了Ｒａｍａｄｇｅ和Ｗｏｎｈａｍ［１～３］的理论对具体系统的应用缺乏可操作性的缺陷，使得对ＣＤＥＰ动态过程的分析变得更为直观，同时也使控制器的设计过程更具可操作性．     

给定拓扑结构的网络的可靠性设计

本文首先讨论了网络链路堵概率的加权平均值，提出了网络分配的一般准则，并在考虑了网络链路生存链路概率的因素后，提出了更一般的网络链路堵塞概率的加权平均值，以此为基础，分别讨论了网络在给定点的费用条件下，使得网络可靠性最大的网络设计问题，以及在给定网络可靠性指标的前提下，使得网络费用最小的网络设计问题。