试论明清大运河上的行船次序

运河开凿与管理的主要目的在漕运,但在实际运行过程中,贡鲜船是运河上的特权船只,漕船次之,然后是官船和军民船,商贾船地位最低.运河行船次序反映了不同船只的政治地位,折射出漕河管理的诸多弊端.特权船只优先使用有限的交通资源,是皇权观念在河道管理中的缩影,不利于商品的顺畅流通与社会经济的健康发展.     

出色奥帆赛评价标准研究

建立出色奥帆赛评价标准体系能对青岛市奥帆赛前的各项准备工作和比赛期间的组织与服务工作起到指导和参考作用。社会影响力、场地设施、组织与服务、环境、综合管理与投入、技术水平等都是建设评价标准的相关因素。青岛市在生态环境、社会管理、市民文明素质、城市文化氛围、城市发展结构等方面与其他举办过奥运会的城市相比还存在差距,因而采取相应措施加以改善,将为出色奥帆赛的举办创设良好的条件。     

一类复子波的时-频局域化特征分析

介绍了一类新的复基子波??Y(母波,引进时间算子和频率算子分析了Y(母波的时间、频率和时－频局域化特征。理论和数值分析结果表明：Y(母波具有良好的时(频局域化特征;选择适当的参变量,可以构造出逼近“最优”时－频局域化特征窗函数的复母波。     

Empirical Bayes vs. fully Bayes variable selection

For the problem of variable selection for the normal linear model, fixed penalty selection criteria such as AIC, _Cp${\mathrm{C}}_p$, BIC and RIC correspond to the posterior modes of a hierarchical Bayes model for various fixed hyperparameter settings. Adaptive selection criteria obtained by empirical Bayes estimation of the hyperparameters have been shown by George and Foster [2000. Calibration and Empirical Bayes variable selection. Biometrika 87(4), 731–747] to improve on these fixed selection criteria. In this paper, we study the potential of alternative fully Bayes methods, which instead margin out the hyperparameters with respect to prior distributions. Several structured prior formulations are considered for which fully Bayes selection and estimation methods are obtained. Analytical and simulation comparisons with empirical Bayes counterparts are studied.     

Familles of confidence bands for the survival function under the general random censorship model and the Koziol-Green model

Familles of asymptotic 100(1 – α)% level confidence bands for the survival function under the general random right-censorship (GRC) model and the proportional-hazards model of random right-censorship, also known as the Koziol-Green (KG) model, are developed. The family of bands under the GRC model is based on the well-known product-limit estimator (PLE), and this family is rich in that it contains as special cases the bands of Hall and Wellner (1980) and Gillespie and Fisher (1979), and more generally, the GF-type and HW-type bands of Csörg? and Horváth (1986), as well as new bands not previously studied. The familles of bands under the KG model are based on the maximum-likelihood estimator of F under this particular model. We compare the PLE-based bands and the MLE-based bands under the KG model. This enables us to study the loss in efficiency of the former bands when used in a setting where they are not optimal. The notion of asymptotic relative width efficiency (ARWE), defined to be the limiting ratio of the sample sizes needed by the bands to achieve the same asymptotic widths, is employed to compare two bands. Through this efficiency measure it is shown that if the censoring parameter β is known, then the PLE-based bands are highly inefficient relative to the MLE-based bands when β is large. When β is not known, the MLE-based bands are asymptotically conservative. Despite their conservatism, they still dominate the PLE-based bands when β is not too small or equivalently when the degree of censoring is not too light. We also compare the various PLE-based bands under the GRC model. The resulting information is valuable for evaluating competing PLE-based bands. We illustrate the confidence bands by utilizing the well-known Channing House data.     

关于具有常数带宽的凸闭曲线的一个附注

本文举例说明具有常数带宽的凸闭曲线不一定是圆。     

浅论一维透射光栅的性能

本文对一维透射光栅话线的衍射角、强度、谱线宽度、色散率、分辩本领等方面的决定因素和性能特点进行了论证。     

脉宽调制（PWM）型300W开关稳压电源的研制

本文介绍笔者研制的脉宽调制（PWM）300W开关稳压电压的电路，原理及部分电路的设计、调度方法，该机具有输出电流大、成本低、实用性强的特点。     

偶一致超图对剖问题的界

研究了偶一致超图的奇对剖宽度和对剖宽度.首先利用张量最大特征值得到奇对剖宽度的下界;其次利用子图张量的最大特征值,得到对剖宽度的下界,该下界是可达的,并给出一个达到下界的超图.     

2008年奥帆赛对青岛率先基本实现现代化的影响

青岛市承办2008年奥帆赛,为青岛提供了一个千载难逢和加速发展的历史性机遇,奥运文化和奥运经济的强大推力,将有力地促进青岛社会、经济和城市现代化水平的全面提升,大大加快现代化的进程,对青岛市全面建设小康社会,推动改革开放和现代化建设事业的跨越式发展,在全国率先基本实现现代化必将产生重大而深远的影响.