Correlation Between Carcinogenic Potency of Chemicals in Animals and Humans

Twenty-three chemicals were selected for comparison of the carcinogenic potencies estimated from epidemiological data to those estimated from animal carcinogenesis bioassays. The chemicals were all those for which reasonably strong evidence of carcinogenicity could be found in humans or animals and for which suitable data could be obtained for quantifying carcinogenic potencies in both humans and animals. Many alternative methods of analyzing the bioassay data were investigated. Almost all of the methods yielded potency estimates that were highly correlated with potencies estimated from epidemiological data; correlations were highly statistically significant (p less than 0.001), with the corresponding correlation coefficients ranging as high as 0.9. These findings provide support for the general use of animal data to evaluate carcinogenic potential in humans and also for the use of animal data to quantify human risk.     

中国股市收益率长记忆性R／S非线性分析

针对中国股市收益率序列中的长记忆性问题,采用R/S非线性估计方法和ARFIMA模型进行了实证研究.结果表明:中国股市收益率普遍存在长记忆性,只有个别股票不存在长记忆性,而且深市比沪市具有更强的长记忆性.     

A non linear wavelet based estimator for long memory processes

Two wavelet based estimators are considered in this paper for the two parameters that characterize long range dependence processes. The first one is linear and is based on the statistical properties of the coefficients of a discrete wavelet transform of long range dependence processes. The estimator consists in measuring the slope (related to the long memory parameter) and the intercept (related to the variance of the process) of a linear regression after a discrete wavelet transform is performed (Veitch and Abry, 1999). In this paper its properties are reviewed, and analytic evidence is produced that the linear estimator is applicable only when the second parameter is unknown. To overcome this limitation a non linear wavelet based estimator - that takes into account that the intercept depends on the long memory parameter - is proposed here for the cases in which the second parameter is known or the only parameter of interest is the long memory parameter. Under the same hypothesis assumed for the linear estimator, the non linear estimator is shown to be asymptotically more efficient for the long memory parameter. Numerical simulations show that, even for small data sets, the bias is very small and the variance close to optimal. An application to ATM based Internet traffic is presented.Financial support from the Italian Ministry of University and Scientific Research (MIUR), also in the context of the COFIN 2002 ALINWEB (Algorithms for the Internet and the Web) Project, is gratefully acknowledged.     

线性调频连续波雷达的噪声性能分析

在白噪声与线性调频连续波重达回波功率语的关系基础上,从理论上分析了白噪声对线性调频连续波重达到距精度和距离分辨力的影响。分析结果表明,雷达采用“差拍－傅里叶”结构在频域上获取目标信息要比采用“差拍－平均频率计数”结构在时域上获取目标信息具有更强的抗噪声性能。     

系统功能语法对情态范围的扩展及其意义研究

系统功能语法把情态范围由传统的仅限于情态助动词扩展为情态助动词、情态化的各种词性及其相应的结构,认为它们都是情态意义的体现形式。通过研究发现,扩展后的情态把和人际意义有关的重要方面都纳入了人际意义的研究范畴,这种扩展实现了传统语法不曾有的重大突破,对语篇的人际功能研究具有重要意义。     

商代新闻传播范围初探

商代的新闻传播范围是伴随着族团迁徙、资源开发、生产交往、技术进步、文字交融、文化认同等而不断扩大的,它西到亚欧,东至海滨,南抵南亚,北达朝鲜,远及美洲,既以商代统治区和文化范围区为轴心放射传播,又有回流交融传播,呈双向态势,比我们设想的要宽广得多、复杂得多。商代新闻传播活动范围大于商代统治区并大于商文化范围。     

形声字意符与传统类属观念

传统类属观念是汉民族整体思维方式的产物,注重整体把握事物、强调事物之间的联系性。具体表现为取象比类与推演系联这两种基本方法。形声字意符表示的是事物的类属概念,体现了先人对于物质世界和精神世界的概括的认识,形声字意符的形成与意符系统的建立,是传统类属观念在文字领域的反映。     

绑架罪若干问题探讨

从绑架罪的社会危害性及刑法的协调性和罪刑均衡原则的角度出发 ,认为已满 14周岁未满 16周岁人应纳入刑法调整的视野 ;勒赎型的绑架罪应以取得财物为既遂标准 ;为索取债务而非法拘禁他人 ,是构成非法拘禁罪 ,还是定绑架罪 ,应从是否存在债权债务关系、债务的性质和主观上的故意内容综合分析判断     

论离婚损害赔偿制度

离婚损害赔偿制度的建立是现代婚姻家庭立法的大势所趋,而制度的构建和完善还需要一个过程。离婚损害赔偿制度有以下三个问题必须明确:一是建立该制度的原因,二是该制度具有的功能作用,三是该制度在司法实践中的适用问题。本文试从以上三个方面加以论述,以推动立法的完善和司法的正确适用。     

周密的家世与交游对其笔记撰述之影响

周密是宋末元初的笔记撰述大家,他的笔记真实反映了当时社会各层面的生活,有着重要的文学、历史价值。周密的家学传统影响着其笔记撰述的原则和理念,父祖辈岁编日记的“家乘”、“日录”,为周密本人的笔记撰述提供了资料来源与撰述典范。而周密丰富的阅历和广泛的交游,对其笔记撰述的影响主要体现在学识养成和资料积累上。