Fowler－Nordheim公式用于实际场发射体的修正

Ｆｏｗｌｅｒ－Ｎｏｒｄｈｅｉｍ公式是一个在理想条件下推导的计算场致发射电流的公式。对场发射体的实验测量表明：实测结果往往比根据Ｆｏｗｌｅｒ－Ｎｏｒｄｈｅｉｍ公式计算的结果大很多，说明这一理想化了的公式应用于实际场发射体时，必须给予修正。本文讨论了产生这一问题的原因，并提出了合理的定量修正方法。     

混凝土初始损伤对爆炸压碎区尺寸影响分析

文中在对已有经验公式分析的基础上．考虑钻孔或侵彻对炮孔产生损伤的影响。引入一个无量纲的参数．提出预估混凝土介质中爆炸压碎区半径的经验公式．通过文献实验对经验公式参数进行拟合．并由文献提供的全尺寸实验对提出的公式进行验证，分析比较表明．文中提出的公式预估与实验符合较好。     

Kalman Filter for Generalized 2-D Roesser Models

The design problem of the state filter for the generalized stochastic 2-D Rocsser models, which appears when both the state and measurement are simultaneously subjected to the interference from white noise, is discussed. The wellknown Kalman filter design is extended to the generalized 2-D Roesser models. Based on the method of ＂scanning line by line＂, the filtering problem of generalized 2-D Roesser models with mode-energy reconstruction is solved. The formula of the optimal filtering, which minimizes the variance of the estimation error of the state vectors, is derived. The validity of the designed filter is verified by the calculation steps and the examples are introduced.     

经纬仪布站位置对交会测量结果影响的分析

以靶场交会测量中常用的L公式为基础,结合误差传递定律,得出目标空间位置的测量误差公式。然后,设置4个不同测站,以一条理想航迹为测量对象,分别得到不同测站两两交会测量结果的误差曲线。对不同位置的双站交会结果以及它们之间的对比等5种基本情况进行了详尽的对比分析,得到了不同布站位置对双站交会测量结果的影响,研究结果对实际工程应用中的经纬仪布站有重要参考价值。     

加减速过程中车载航位推算误差补偿技术研究

研究轮式车辆加减速过程中带来的两种效应,即车辆载荷的转移及轮胎的滑动,并分析其对车辆航位推算的影响,综合这两种效应带来的影响,提出了轮胎计算半径的概念,建立了加减速过程中的误差补偿模型.跑车实验表明,经过误差补偿距离精度由3‰提高到0.5‰,精度提高近1个数量级.     

Modeling and Analysis of Broadband Cellular Networks with Multimedia Connections

As mobile networking is moving towards the direction of providing high-speed multimedia services, the presence of connections that do not generate traffic at constant rate is becoming reality in wireless environment. For preliminary network design purposes analytical models are necessary that examine the performance or wireless networks with such connections. In this paper an analytical method is presented to calculate call-level system parameters of cellular networks with multimedia connections. The method is based on an approximate recursive calculation. The accuracy of the approximation is verified by computer simulations. The derivation of the distributions of user describing time variables and two simple admission control policies are also presented and investigated.     

An improved t‐out‐of‐n e‐lottery protocol

In 2009, Lee and Chang proposed an electronic t‐out‐of‐n lottery protocol over the Internet based on the Chinese remainder theorem and blind signature. However, a security flaw exists in Lee–Chang's protocol that the lottery agent and the malicious purchaser can collude to control the winning result, which is unfair for the honest participants. On the basis of a verifiable random number generated by using the Lagrange interpolation formula over a finite field, an improved t‐out‐of‐n e‐lottery protocol is proposed, which guarantees that each participant can generate the winning result equally. The improved protocol achieves public verifiability and fairness without a trusted third party and a delaying function, which makes it more robust and more efficient. Copyright © 2013 John Wiley & Sons, Ltd.     

小芯径空芯传能光纤的理论分析

从理论上给出了小芯径条件下的芯径选取范围，进而通过实验进行了验证。同时还对电介质包层空芯传能光纤应用于小芯径条件下的模式畸变规律及损耗特性进行了讨论。     

对传统多径因子计算公式的完善

根据实际测量经验,结合实际情况,对传统多径因子计算公式进行了分析,得出了传统公式的适用条件以及不能适应的范围,并给出了更准确的公式,使之更为完善。     

一种新型时域反射系数近似方法

提出一种新型时域反射系数渐进公式,该公式形式简单且不受截断误差影响,解析式完备且结果精确,可有效地提高时域射线跟踪法的预测精度。用新方法对室内超宽带信号的平均功率延迟分布进行了预测,仿真结果和公开发表的文献结果相比,一致性良好。研究工作证明:新型时域射线跟踪法是预测超宽带信号传播特性的一种有效方法。