两点边值问题有限元重构导数超强收敛性

基于两点边值问题 ,本文在改进的单元正交估计和连续性优化的基础上 ,研究了一种n次有限元单元块导数重构 ,该方法所获得的重构导数在单元块内部有n- 1个强超收敛点 .     

Historical review on research of kinetics in thermal analysis and thermal endurance of electrical insulating materials

In 1925 a paper on kinetic analysis of data obtained with thermobalances for isothermal mass loss of some natural products for electrical insulation was published. This is the first theoretical and experimental approach to accelerated test of electrical insulating materials and also to kinetic analysis of thermal analysis data at isoconversional points. In succeeeding papers, change in chemical composition and kinetics under temperature change were dealt with. A historical review of these two topics is described in this review article, especially on the basic concept commonly induced for these two fields.     

GeSi／Si应变超晶格探测器的制作

介绍ＧｅＳｉ／Ｓｉ应变新材料探测器的制作方法，它不仅与Ｓｉ微电子工艺相兼容，而且还可调节Ｇｅ含量使其禁带宽度满足现代光纤通信器件的要求。     

挤扩支盘桩的工程应用

介绍了挤扩多支盘桩在工程实例中的应用,并对工程同场地内的挤扩支盘桩与普通钻孔灌注桩进行承载力和沉降的对比试验研究.工程试验结果表明:在同等工程地质条件下,采用挤扩支盘桩能大幅度提高单桩承载力,减少沉降,具有良好的经济效益.     

Testing the Gumbel Hypothesis Via the Pot-Method

We consider an i.i.d. sample, generated by some distribution function, which belongs to the domain of attraction of an extreme value distribution with unknown shape and scale parameters. We treat the scale parameter as a nuisance parameter and establish for the hypothesis of Gumbel domain of attraction an asymptotically optimal test based on those observations among the sample, which exceed a given threshold sequence. Asymptotic optimality is achieved along certain contiguous extreme value alternatives within the concept of local asymptotic normality (LAN). Adaptive test procedures exist under restrictive assumptions. The finite sample size behavior of the proposed test is studied by simulations and it is compared to that of a test based on the sample coefficient of variation.     

试探算法与SSOR预处理共轭梯度算法的拟最佳因子

1引言在求解系数矩阵为对称正定的大型线性代数方程组Au=b (1．1)的迭代法方面,七十年代以来发展了各种预处理共轭梯度法．由于SSOR分裂中具有对称因子,可用于加速共轭梯度法,称为SSOR预处理共轭梯度法(简记为;SSORPCG．同时,由于当松弛因子ω∈(0,2)时,SSOR迭代法收敛,从而进一步发展了m步SSOR预处理共轭梯度法(简记为:m-step SSORPCG．胡家赣证明,经过最优的SSOR预条件,预优     

Weibull分布场合具有非常数形状参数恒加试验的参数估计

本文讨论了Weibull分布场合恒加寿命试验的点估计和近似区间估计，利用模拟方法说明所给方法的有效性。     

Simultaneous recording of fringe patterns with one camera

A novel method to separate and simultaneously record the Moiré interferometry fringe patterns of three deformation fields with only one CCD camera is developed; details of its operation principle, key points and error analysis are presented. With this technique, the deformation inU, V andW fields can be measured simultaneously, so dynamic test with comprehensive information can be performed. The advantage of this technique over other similar techniques lies in its simplicity, easy implementation and low cost. An application of this technique is given to show its feasibility. Technical problems that may be caused with this technique are also analyzed.     

Confidence Regions on Variance Components in an Extended ANOVA Model for Combining Information

In this paper we consider a general variance components model for combining experiments that allows for a possible interaction of responses with groups. The variance estimate from each experiment cannot take into account this interaction which can additionally be different from experiment to experiment. The interaction term can be interpreted as an additional variance component so that we consider an extended ANOVA model. We derive confidence regions and test of hypotheses on the variance components which – at least approximately – hold the nominal significance level.     

Brent原油期货市场的协整性分析

本文利用单位根检验和协整关系检验验证了Brent原油期货市场的有效范围,发现其在5个月内是有效的。在市场有效范围内,对现货价格和期货价格建立了向量误差修正模型,具有良好的预测效果。同时发现该期货市场某时刻价格的影响可以持续2个月。