煤及焦炭标准样品国内外发展概况

阐述了煤及焦炭标准样品的发展概况,通过对国内外煤及焦炭标准样品的种类、技术性能指标等方面进行比较,指出了煤及焦炭标准样品的变化动态与发展趋势。     

The method of upper and lower solutions and impulsive fractional differential inclusions

In this paper the concept of lower and upper solutions combined with the fixed point theorem of Bohnnenblust–Karlin is used to investigate the existence of solutions for a class of the initial value problem for impulsive differential inclusions involving the Caputo fractional derivative.     

南城县学龄儿童发锌水平的研究

采用原子吸收光谱法测定了南城县城关小学540名6－14岁学龄儿童头发中锌的水平。将所得数据在计算机上进行统计分析。结果表明，本资料属非正态性资料，样本中位数为108．3×10-6，其中男性为103.85×10－6，女性为111．5×10－6。男女间有显著差别。年龄与发锌值之间呈正相关。     

应用极值理论计算VaR的一种方法

在险价值(value at risk，简称VaR)是度量市场风险的一种普遍使用的工具，也是金融风险管理中的基础工具。计算VaR有许多不同的方法，本考虑了数据间的相关性，通过部分重叠数据分组的方法来计算VaR，发现所得到的VaR更符合实际；另外，我们对分组大小作了研究，发现分组数据大小的幂律存在，并对恒生指数作了具体分析。由此得出计算VaR的合理的数据分组大小。     

Energetic Evaluation of Biomass Originating from Forest Waste by Bomb Calorimetry

Calorific values and flammability changes during a year for forest waste originating from silviculture task in Galicia (NW Spain) are reported. These waste materials are becoming to be used as alternative fuels. The present study was made on several hardwood forest species. These forest species occupy nowadays approximately 30% of the total forest surface of Galicia. Calorific values were measured by static bomb calorimeter in an oxygen atmosphere. Flammability was determined using a standard epiradiator. Simultaneously, some other parameters such as elementary chemical composition, heavy metal contents, moisture, density, ash percentage after combustion in the bomb, and main bioclimatic characteristics, were also determined. This revised version was published online in July 2006 with corrections to the Cover Date.     

一类非线性奇摄动非局部反应扩散系统

Recently the nonlinear singularly perturbed problem has been investigated in theinternational academic circles[1 ,2 ] .Approximation methods have been developed andrefined,including the method of averaging,boundary layer method,matched asymptoticexpanision method and multiple scales method.Many scholars such as O' Malley,Jr.[3] ,Butuzov,Nefedov and Schneider[4] ,Kelley[5] ,Mizoguchi,Yanagida and Life[6] have done agreat deal of work.Using the method of differential inequality and other met…     

On the Plane Orthotropic Stress Problem of Quasi-Static Thermoelasticity

The plane stress boundary value problem of quasi-static linear orthotropic thermoelasticity is discussed. The thermoelastic system on a bounded simply-connected domain is decoupled. The decoupled temperature equation is investigated by using accurate estimation and the contraction mapping principle. Representations of solutions of the field equation are obtained, and some solvability results are proved. The results are of both theoretical and numerical interest.     

Oscillation of solutions of parabolic differential equations of neutral type

In this paper, we investigate a class of parabolic differential equations of neutral type, and obtain some sufficient conditions of the oscillation for such equations satisfying two kinds of boundary value conditions.     

具最大拟亏量和的亚纯函数的某些性质

本文讨论具最大拟亏量和的亚纯函数的性质，得到一些有趣的结果．