毫米波高增益大功率收发组件研制

提出了一种可用于雷达的毫米波收发组件的实现方案。组件包括两个几乎完全相同的接收通道和一个发射通道,接收通道采用两次混频将毫米波信号变为50MHz中频,而发射通道则采用两次上变频将50MHz信号变为毫米波频段的信号发射出去。该文分析了收发组件的设计原理,讨论了组件方案选择,并给出了测试结果。收发组件的各项技术指标基本达到设计要求:在10MHz的工作带宽内,连续波发射功率达1W,接收机噪声系数小于4.5dB,接收通道的净增益超过100dB。     

Goodness-of-fit tests for a heavy tailed distribution

We study the Kolmogorov–Smirnov test, Berk–Jones test, score test and their integrated versions in the context of testing the goodness-of-fit of a heavy tailed distribution function. A comparison of these tests is conducted via Bahadur efficiency and simulations.     

关于房地产泡沫量的测度研究

房地产基础(内在)价值理论是评估房地产资产泡沫的依据.而只有准确评估房地产资.产的基础价值,投资者和决策者才能正确认识房地产泡沫问题.文章首先对Ramsey模型做了改进.使之更具有实用价值;接着利用改进后的Ramsey模型,测算了我国1991～2006年房地产泡沫.研究结果表明,我国房地产经历了一个由正泡沫到无泡沫负泡沫、反复循环的过程.     

GORE-TEX~与有机溶剂结合法在纺织品文物保护中的应用

部分纺织品文物在保护过程中不宜与水接触,或普通的保护方法不能满足实际操作的要求,因此需要寻找一种替代技术.本文介绍了采用微孔膜层压织物材料GORE-TEx@与有机溶剂结合法应用于纺织品文物保护的新型技术,并对GORE-TEx@材料及该新型技术的使用方案、应用方向和注意事项进行了总结.     

安徽省农业贷支差异性的实证分析

本文分别选取从1998年1月至2004年2月连续74个月的安徽省短期贷款中的农业贷款余额和财政支出中的支农支出数据，利用季节预测法计算出1998年1月至2004年12月的农业贷款余额和支农支出值，将其与实际值比较得出：连续7年时间里，该省的农业贷款余额呈上升趋势，而支农支出却呈下降走势。最后就两者存在的走势差异性提出要切实加大对农业的支持，有必要结合经济增长趋势、消费价格指数等变量综合考虑如何更好地进行支农行为。     

基于分形理论下的外汇市场的预测

在全球金融一体化的大背景下，汇率的变动作为一个重要指标越来越被人们所重视，利用非线性特征来研究汇率问题已经成为研究的前沿和热点，将混沌与分形运用到汇率预测与汇率控制中是汇率研究的一个重要的分支。为此，分析了分形中的R/S方法，研究了转折点的选择；并以外汇市场中的美元、日元、欧元为例进行了实证分析，指出外汇市场服从分形分布； 运用该方法对外汇的变化进行分析，不仅得出汇率变化遵循有偏的随机游走，而且还预测出这三种汇率未来的走势。     

Bayesian mixture modeling for spatial Poisson process intensities,with applications to extreme value analysis

We propose a method for the analysis of a spatial point pattern, which is assumed to arise as a set of observations from a spatial nonhomogeneous Poisson process. The spatial point pattern is observed in a bounded region, which, for most applications, is taken to be a rectangle in the space where the process is defined. The method is based on modeling a density function, defined on this bounded region, that is directly related with the intensity function of the Poisson process. We develop a flexible nonparametric mixture model for this density using a bivariate Beta distribution for the mixture kernel and a Dirichlet process prior for the mixing distribution. Using posterior simulation methods, we obtain full inference for the intensity function and any other functional of the process that might be of interest. We discuss applications to problems where inference for clustering in the spatial point pattern is of interest. Moreover, we consider applications of the methodology to extreme value analysis problems. We illustrate the modeling approach with three previously published data sets. Two of the data sets are from forestry and consist of locations of trees. The third data set consists of extremes from the Dow Jones index over a period of 1303 days.     

微翅管几何参数对混合工质流动沸腾特性的影响

对非共沸混合工质R32／R134a在水平微翅管内的流动沸腾特性进行了实验研究，获得了微翅管的翅高和翅数对换热性能的影响，并综合比较了3根微翅管的换热性能。同时，将微翅管与光管性能进行了比较。结果表明，在相同工况下，翅高为0．2mm、翅数为60的换热性能最好；微翅管的换热性能明显优于光管。     

论循环经济条件下建筑材料的开发与利用

在总结建筑材料开发与利用现状及存在的问题并深入分析其原因的基础上,遵循循环经济"减量化、再使用、再循环"的3R原则,从转变观念意识、加强科技创新、致力体制改革、严格管理等方面,提出了建筑材料开发与利用的对策。     

THE EURO AND THE GEOGRAPHY OF INTERNATIONAL DEBT FLOWS

Greater financial integration between core and peripheral European Monetary Union (EMU) members not only had an effect on both sets of countries but also spilled over beyond the euro area. Lower interest rates allowed peripheral countries to run bigger deficits, which inflated their economies by allowing credit booms. Core EMU countries took on extra foreign leverage to expose themselves to the peripherals. We present a stylized model that illustrates possible mechanisms for these developments. We then analyze the geography of international debt flows using multiple data sources and provide evidence that after the euro's introduction, core EMU countries increased their borrowing from outside of the EMU and their lending to the EMU periphery. Moreover, we present evidence that large core EMU banks' lending to periphery borrowers was linked to their borrowing from outside of the euro area.