CDMA的基本原理及其在数字蜂窝通信中的应用

本文首先介绍了蜂窝通信的无线传输环境以及分多址的基本原理，然后介绍了在数字蜂窝系统中采用ＣＡＤＭ技术的优越性及其不足之处，并针对此不足简单地介绍了国内外在此方面的研究动向。     

海洋石油专业公司股份制改造探析

着重从专业公司的现状分析改制对自身改革的深入及资源配置等所具有的现实意义和必要性，阐述改制应坚持“实事求是”、“以市场为导向”、“股本适度分散”等主要原则，提出其开展改制工作必须利用好自身优势和突出石油专业公司特色，论述了影响专业公司改制成功与否的主要因素及改制过程中会面临的主要问题，由此在总体上把握专业公司改制可选择的战略投资伙伴。     

Evaluation method for expressway rock slope stability based on numerical simulation

Taking the deep cutting excavation of Beijing-Qinhuangdao expressway as an example, the paper utilizes DYNA-2D dynamic FEM procedure to simulate the rock blasting process. The computation model was based on dynamical response of nonlinear elasto-plasticity material. According to analyses of the distribution and transmission of stress field, displacement field, velocity field, and acceleration in the course of blasting,and discusses of the blasting vibration influence to the rocky cut slope from many sides.the calculated results met well with that of in situ measured results. It is easy to determine vibration state of any point in the slope such as stress, displacement, velocity and acceleration, which confirm that numerical simulation method is feasible. The meaning of this research is not only to design the blasting construction to forecast and prevent the expressway rocky slope from disaster in mountains area, but also to offer a new experience of numerical method in geotechnical field.     

正铲液压挖掘机工作装置的动力学分析与仿真

对一种正铲液压挖掘机进行动力学分析,运用虚功原理对工作装置进行动力学建模。基于Matlab对动力学模型进行数值计算,在给定负载情况下得到了铲斗在挖掘过程中3组液压缸的驱动力变化曲线。利用ADAMS仿真软件对该挖掘机工作装置进行动力学仿真,将仿真得到的结果与计算值进行对比,得到3组液压缸的驱动力误差曲线,误差在合理范围内,证明了动力学建模方法的正确性。     

Stability analysis of the open-pit mine slope and the study on the incensement of the slope angle

Based on the exploration of the engineering geology and the rock mechanics testing, limit equilibrium analysis method was adopted to calculate the stability of the Huogeqi Copper Mine slope, the results show that the original slope angle is too conservative and the slope have the potential of more preferable slope angle. In order to discuss the possibility of slope angle enhancement, sensitivity analysis of parameters related to limit state slope was made. Quantitatively determined angle value of the adding and the optimal slope angle was obtained. The study having performed showed that it is not only useful for the safety control of open-pit mine slope but also for the open-pit mine design for the similar geological condition.     

钨钼混配型杂多酸盐催化剂上酯化反应条件的优化研究

以Na2WO4·2H2O和 Na2MoO4·2H2O为原料,通过硝酸酸化-乙醚萃取法制备了一种钨钼混配型杂多酸盐催化剂（Na4SiMoW12O40·xH2O）.应用X射线荧光光谱对合成的催化剂的元素组成进行了分析;通过红外光谱对其的官能团结构进行了分析;借助热重分析对其的热稳定性进行了研究.并以正丁醇和乙酸为反应物,研究了所制备的钨钼混配型杂多酸盐在催化酯化反应时的活性和稳定性.通过正交试验[L9（3）4]对影响乙酸正丁酯收率的关键影响参数进行了优化,包括催化剂与反应物的质量比、反应时间和温度、以及正丁醇与乙酸的摩尔比.结果表明：当反应时间为120 min,反应温度为90℃,催化剂用量为0.4 g,醇酸摩尔比为2∶1,酯化效果最好,达到93.24 wt%.     

分布式仲裁机制在直流无线电能传输系统中的应用

为满足便利、安全、美观的直流家电需求,海尔智家研发了电饭煲、搅拌机、破壁机、咖啡机等系列直流家电产品,并成功将1200 W功率级别的直流无线供电系统应用到了直流家电中,形成了系列直流无线供电家电。在直流无线供电家电研发优化过程中,为消除直流无线供电家电在特殊情况下可能出现的安全隐患,设计和实现了基于优先级的分布式仲裁机制的优化方案,增强了直流无线供电家电的鲁棒性和安全性。首先,介绍了直流无线供电家电及其供电系统的设计方案;其次,详细阐述了基于优先级分布式仲裁机制的即放即用优化方案仲裁规则,及其应用于海尔智家直流无线供电系统中的工作过程;最后,设计了样机及测试方案,验证了优化方案的有效性。     

“自动控制原理”课程特色教学研究与探索

本文针对目前“自动控制原理”的教学中存在的问题,结合课程难学难懂的特点,提出并实施宏观概念教学和石油过程控制工程背景的特色教学、启发式教学、娱乐趣味式教学和温故关联渗透教学等特色教学方法,形成特色教学体系和理念.近五年的实际教学表明,这些特色教学方法提高了教学效果.