An alternative method correcting BDR type of heteroskedasticity by the weighting re-estimated absolute residuals

The aim of this paper is to introduce a new method which corrects residual variances for the butterfly distributed residuals (BDR). Distribution theory, confidence intervals, and tests of hypotheses are valid and meaningful only if the standard regression assumptions are satisfied. Heteroskedasticity is one of the violations of these assumptions and BDR is another type of heteroskedasticity. This study reveals an alternative approach to correct the BDR type of heteroskedasticity by the weighting re-estimated absolute residuals (WRAR). After giving brief information about heteroskedasticity and BDR type of heteroskedasticity, WRAR is introduced. WRAR and the usual variance stabilizing techniques are compared on multiple and simple regression models.     

周期性介质切伦柯夫脉塞的粒子模拟

通过对周期性介质切伦柯夫脉塞的分析,采用等效电容的方法将周期性介质等效为均匀的各向异性介质,从而推导出了注波互作用色散方程,并进行了数值模拟。研究发现微波频率和输出功率随着介质膜片宽度的变化而变化,通过调整周期中介质所占的比例(即相当于调整纵向介电常数和横向介电常数)来调整输出频率和功率,从而使研制出高频率微波器件成为可能。     

超高压地层组合套管的优化设计

国内许多油田深部地层的径向超高压，导致套管大量被挤毁变形，严重影响了油气的正常生产，针对这个问题，本文根据弹性力学中的厚壁简理论和机械优化设计理论，提出了组合套管的优化设计方法。用该方法设计的组合套管，可有效地防止深部软岩地层的径向超高压所引起的套管变形或挤毁。     

Approximations for Gibbs Distribution Normalising Constants

A key difficulty in the use of Gibbs prior distributions in Bayesian image analysis is the intractability of the normalisation constant. One approach is to perform off-line simulations which allow a calibration of normalisation constant against prior parameter. In this paper the reverse-logistic regression approach to calibration will be examined for various Gibbs distributions and explicit parametric equations will be proposed. A simple method for combining separate calibrations will be illustrated and the relationship between normalisation constant and image size will be explored with an empirical approximation proposed.     

Parameter estimation and design considerations in prospective applications of the � chart

The effects of parameter estimation on the in-control performance of the Shewhart X¯ chart are studied in prospective (phase 2 or stage 2) applications via a thorough examination of the attained false alarm rate (AFAR), the conditional false alarm rate (CFAR), the conditional and the unconditional run-length distributions, some run-length characteristics such as the ARL, the conditional ARL (CARL), some selected percentiles including the median, and cumulative run-length probabilities. The examination involves both numerical evaluations and graphical displays. The effects of parameter estimation need to be accounted for in designing the chart. To this end, as an application of the exact formulations, chart constants are provided for a specified in-control average run-length of 370 and 500 for a number of subgroups and subgroup sizes. These will be useful in the implementation of the X¯ chart in practice.     

"置换法测定摩尔气体常数R"的教改研究

引入计算机程序处理实验数据,把计算机多媒体与化学基础实验有机结合在一起,是教学改革过程中很有意义的一项工作.围绕以氢气替代理想气体采用"置换法测定摩尔气体常数R"的实验,设计了相应的计算程序,并通过学生的实验数据验证该程序的可行性和可靠性.     

要大力弘扬和培育“自强不息”的中华民族精神

本文在揭示"自强不息"的中华民族精神内涵的基础上,从中华民族五千多年的发展史、市场经济和全球化趋势的发展、当代青年的成才三个方面,论述了大力弘扬和培育"自强不息"的中华民族精神的重大意义.     

非对称共面线的特性阻抗

分析了两种不同模型的自由空间中非对称面西线,其共形变换技术得到了线电容的严格解;讨论了双曲正切变换有限厚度介质基片上的非对称共面线,得到了单层有限厚介质基片情况下非对称共西线的有效介电常数、单位长度电容和特性阻抗的闭合表达式。     

分组公平排队算法的仿真研究

对ＡＴＭ复接器和输出缓存ＡＴＭ交换机采用各种分组公平排队算法情况下的信元时延进行了仿真。仿真结果表明,ＳＣＦＱ对连接之间的隔离性比其他算法差;若一个ＣＢＲ速率组内没有流量超过其预约带宽的连接,则用 Ｐｅｒ＿Ｒａｔｅ＿Ｇｒｏｕｐｉｎｇ方式实现 ＷＦ２Ｑ＋和不用这种实现方式,从最大时延和平均时延来看,相差不大。提出了一个调度 ＣＢＲ、 ＶＢＲ、 ＡＢＲ和 ＵＢＲ的调度器结构,既能满足 ＣＢＲ对时延的严格要求,又能保证ＶＢＲ、ＡＢＲ和ＵＢＲ的吞吐率,同时还具有较低的实现复杂性。     

论艺术体验的特性和深化

艺术体验是一种主动、自觉的生命体验,它是一种创造,而不是各自分离的心理要素的堆积.它具有一、个体性和不可替代性;二、假定性与虚拟性;三、双向建构性;四、流动深化性等特点,是一个不断深化永无止境的过程.