利用调频率匹配的DRFM欺骗干扰检测方法

针对转发式线性调频(LFM)有源欺骗干扰的检测问题,提出了基于干扰信号谐波分量调频率匹配的检测方法．数字射频存储器存在谐波效应特性,该方法通过分析干扰信号的频谱特征规律,建立谐波分量调频率参数库．在雷达距离门内同时存在目标回波和干扰信号的情形下,利用分数阶傅里叶变换检测雷达回波中LFM信号分量并估计其调频率,通过与参数库进行匹配分析,实现干扰信号的检测．仿真结果验证了该方法的有效性．     

一类耦合的非线性方程组的离散解法

给出了对压力方程的二阶差分离散和对浓度方程的特征差分方法。同时讨论了这种方法的收敛性。     

石蜡的国内外市场

石蜡在国际市场上相对稳定，预计２０００年的需求量为３５０万ｔ，价格仍将维持在目前的水平。１９９５年我国石蜡的产量为８４．５万ｔ，预计２０００年国内需求量约６０万ｔ，出口量将达５０万ｔ     

复杂硅酸盐矿物Gibbs自由能和焓的一种近似计算法

在前人工作的基础上,提出了计算复杂硅酸盐矿物热力学数据的一种简单近似计算方法,即将复杂硅酸盐看作由若干酸性、碱性氧化物化合而成,复杂硅酸盐的Gibbs自由能（或焓）近似等于各氧化物Gibbs自由能（或焓）之和再加入酸性、碱性氧化物之间化合的反应自由能（或反应焓）。该方法计算简便,大部分情况下相对误差小于2％,能够计算任意温度下复杂硅酸盐矿物的Gibbs自由能和焓。     

Scientific basis for establishing country greenhouse gas estimates for rice-based agriculture: An Indian case study

A comprehensive scientific assessment of CH₄ budget estimation for Indian rice paddies, based on a decade of measurements in India, is presented. Indian paddy cultivation areas contain soils that have low to medium levels of soil organic carbon. The average seasonally integrated CH₄ flux (E _sif) values calculated from these measurements were 15.3 ± 2.6 g m^–2 for continuously flooded (CF), 6.9 ± 4.3 g m^–2 for intermittently flooded (IF) single aeration (SA) and 2.2 ± 1.5 g m^–2 for IF multiple aeration (MA) rice ecosystems. For CF and IF (MA) rice ecosystems having high soil organic carbon, without organic amendments, the CH₄ flux (E _sif) may be increased by 1.7 times relative to low soil organic carbon, whereas it may enhance by 5.3 for CF if amended organically. Organic amendment and high soil organic carbon paddy areas do not alter the methane budget estimates for India (3.6±1.4 TgY^–1) much, due to their small paddy harvested area. Methane estimated using average emission factors (E _sif) for all paddy water regimes, which include harvested areas having soils with high organic carbon and organic amendments, may give a budget of 5 TgY^–1 for India.     

An optimal stopping time for a power law process

Exact reliability analysis for complex repairable systems are usually difficult because of the complicated failure process that can result from repair policy. A common approach in practice is to use a simplified process such as the Power Law process which, although not exact, yields useful practical results. In this paper we consider the problem of determining a stopping time when estimating parameters of a Power Law process. The Bayes method is used in order to obtain an optimal time.     

矢量图形智能判断技术的研究与应用

研究矢量图形识别是建立工程制图自动阅卷与计算机辅助教学系统的基础。由于组成二维矢量图形图元类型的多样化及图形整体位置状态的不确定性，增加了矢量图形的识别与判断难度。结合开发的《三视图智能解答》系统，研究其智能识别与判断技术。系统中引入三视图导航技术，解决了图形整体定位与识别问题。实现了对矢量图形图元素信息的分类和提取，能够对所提取的的信息与标准答案进行智能判断与评定。该方法已在AutoCAD2000环境下使用AutoLISP语言编程实现。     

SinC内插的有限长分析

高速宽带数字化示波器在高扫速工作时,仅能采集信号的少数样点。为了看清信号的全貌和精确测量其参数,必须在每两个样点之间进行插值(波形重构)。通过对信号能量的估计,推导了满足精度条件的SinC抽样内插的有限长选取算法,从数字信号处理的角度,研究了高速采样信号数字内插理论。计算机仿真证实了推导的有效性。     

国企投资的造价管理浅析：对某大型技改项目的审计调查

分析了大型国有企业技术改造项目超概算原因,并就如何提高投资效益提出了一些建议。     

基于CBR的产品成本估计及其报价研究

为了有效地估计相关的生产成本,提出一种基于产品成本BOM的CBR快速报价模型,并对CBR成本估计模型中的案例组织、案例索引、案例初始化、案例检索以及案例修正等进行研究。案例研究表明,基于CBR的快速成本估计可以很好地满足产品成本快速估计和商务报价需求。