用DDM实现分布式三维虚拟环境

介绍了HLA中数据分发管理(DDM)的过滤原理;研究分析了目前几种实现DDM过滤机制的方法及其存在的问题,并提出一种简单易行的DDM实现策略,以实现三维虚拟环境的分布式,来提高它的响应速度.     

ZrO2基固体电解质氧传感器的研究现状及发展趋势

近年来,由于ZrO2基固体电解质氧传感器具有高的测氧灵敏度和在高温下的化学稳定性,因而在节约能源、环境保护等方面得到了广泛的应用。该文首先介绍了ZrO2基固体电解质氧传感器的测氧原理,然后阐述了ZrO2基固体电解质氧传感器的研究现状;重点介绍了氧传感器导电理论,及在高温和低温条件下工作的氧传感器研究状况和氧传感器的应用研究,并对氧传感器未来的发展进行了分析和展望,指出为了获得高性能的氧传感器应重点发展纳米材料氧传感器。     

惯性导航系统水平阻尼网络的自适应控制

当海况变化较大时，惯性导航系统(INS)的误差振荡幅度较大．为了减小系统误差的振荡幅度，提出了一种新的设计思想，采用自适应控制方法，根据实际的海况变化情况，实时校正阻尼参数，使由舰船的机动性造成的系统误差最小．结果表明，与传统方法相比，水平误差角振荡幅度减小了约50％，速度误差振荡幅度减小了约30％．经度、纬度和航向误差振荡幅度也有明显改善；水平阻尼网络的自适应控制有效地改善了INS的动态性能．     

探针式水位跟踪仪的设计与应用

介绍了水位跟踪原理,分析了一种新型的探针式水位跟踪仪及其构成。     

正交拉丁矩阵的上下界

引进了一般形式的拉丁矩阵,并讨论了相互正交的拉丁矩阵个数的上下界。     

Elaboration and Properties of Nanocomposite Structures Based on Crown Modified Platinum Nanoparticles

1 Results This paper presents the development of platinum nanocomposites structures based on organically modified c.a.2 nm core platinum nanoparticles.The chemical modification of the 4-mercaptoaniline functionalized particles by various in coming molecules is evidenced and precisely quantified.The particles can be dissolved like molecules in various solvents depending on the features of the new crown and X-rays shows that the interparticle distance is affected by the crown modification.These platinum n...     

抽水引起岩土体内应力变化分析

针对开采地下水这一特定问题,以在抽水实践中地下水水位面是一以井心为顶点的旋转抛物面为出发点,研究了地下水开采过程中岩土体应力变化的时空规律。通过分析影响内部应力变化的宏观物理量—开采影响半径、井心水位下降和空间位置,可以方便的得到随着时间变化岩土体内部应力变化的全程规律。同时,分析了影响边界、下沉位置等因素对计算结果的影响。     

A ground‐level ozone forecasting model for Santiago,Chile

A physically based model for ground‐level ozone forecasting is evaluated for Santiago, Chile. The model predicts the daily peak ozone concentration, with the daily rise of air temperature as input variable; weekends and rainy days appear as interventions. This model was used to analyse historical data, using the Linear Transfer Function/Finite Impulse Response (LTF/FIR) formalism; the Simultaneous Transfer Function (STF) method was used to analyse several monitoring stations together. Model evaluation showed a good forecasting performance across stations—for low and high ozone impacts—with power of detection (POD) values between 70 and 100%, Heidke's Skill Scores between 40% and 70% and low false alarm rates (FAR). The model consistently outperforms a pure persistence forecast. Model performance was not sensitive to different implementation options. The model performance degrades for two‐ and three‐days ahead forecast, but is still acceptable for the purpose of developing an environmental warning system at Santiago. Copyright © 2002 John Wiley & Sons, Ltd.     

格值诱导空间的若干特征定理

讨论了格值诱导空间及相关的弱诱导空间和满层空间的代数特征和拓扑特征。