浅谈公路建设与环境保护

在目前国家大力发展基础设施建设的环境下,文章对公路施工建设过程中产生的环境因素、公路建设对环境的作用与影响等几方面阐述了自己的观点.     

Generalized reliability measures of Kalman filtering for precise point positioning

To deal with the adverse influence of model failures on Kalman filtering (KF) estimation, it is necessary to investigate the generalized reliability theory, including the model failure detection and identification method as well as the separability and reliability theories. Although the generalized reliability theory for the least square has been discussed for many decades, the generalized reliability theory of KF is not widely discussed. Compared with the least square, KF includes not only the measurement model, but also the dynamic model. In KF, the predicted value of the state parameters from the dynamic model is considered as pseudomeasurements and combined with the observed measurements to compose the form of the least square. According to the reliability of the least square, the generalized reliability of KF is derived. Then, the dynamic model failure of precise point positioning is simulated to demonstrate the usage of the generalized reliability theory. The results show that the adverse influence of the dynamic model failure is more severe than that of the measurement model. Moreover, it is recommended that the model failure identification should always be used even if the overall model test passes. It is shown that the derived generalized reliability measures are suitable for the generalized KF estimation.     

改进的溶胶-凝胶法制备超细铜粉

对溶胶－凝胶法进行了改进，由溶胶直接制备出超细铜粉，找到了制备超细铜的Ｇ分散剂及最佳制备条件，并获得了平均粒径为１０ｎｍ的铜粉。     

一个Gaussian移动平均过程的It(o)与Tanaka公式

考虑由Brownian运动驱动的一类移动平均过程，在某些适当的假定条件下给出了该过程的Ito公式与Tanaka公式。     

高原抽油机移机技术应用

高原抽油机的最大优点就是节电、长冲程慢冲次减少油井杆管偏磨频次、延长油井免修期,但是油井作业时,受到井场大小、作业机品种的限制,只能雇用推土机完成高原抽油移机工作,费用非常昂贵,同时具体操作复杂、时间长短不定、给抢开作业井、提高油井时率造成一定的影响.通过现场调查研究,在保障高原抽油机迅速、及时、安全、低费用的前提下,精心设计,研制出了高原抽油机位移装置,多次试验,在油井作业现场移机技术应用获得成功.     

高炉余压透平发电机组（TRT）异常振动原因分析

以1台高炉余压透平发电机组一次振动超标导致停机为切入点,分析了引起振动的主要原因,并详细介绍了该次事故的处理方法,并对机组以后运行和检修应考虑的问题提出了一些改进建议。     

TSPN: Term-based semantic peer-to-peer networks

In this paper, we propose Term-based Semantic Peer-to-Peer Networks (TSPN) to achieve semantic search. For each peer, TSPN builds a full text index of its documents. Through the analysis of resources, TSPN obtains series of terms, and distributes these terms into the network. Thus, TSPN can use query terms to locate appropriate peers to perform semantic search. Moreover, unlike the traditional structured P2P networks, TSPN uses the terms, not the peers, as the logical nodes of DHT. This can with-stand the impact of network churn. The experimental results show that TSPN has better performance compared with the existing P2P semantic searching algorithms.     

两点电位滴定法测定醋酸电离常数及其热力学参数

用改进的两点电位滴定法测定醋酸在15℃、25℃、35℃和45℃条件下的电离常数，进而求出了醋酸根加质子反应的热力学参数ΔG、ΔH和ΔS．本方法与其它方法相比较，具有操作简单，结果准确等优点．     

高速凸轮机构动态分析的实用研究

按工程实际需要，本文对高速凸轮机构的动力学综合、动力学响应等问题进行了简化的分析和研究，并得出了实用的结论．