多卜勒数字滤波器组的逻辑设计与故障诊断

本文讨论了MTD雷达中多卜勒窄带匹配滤波器组的硬件、时间逻辑和微程序设计,重点研究了滤波器硬件系统的自动检测与故障诊断,这种诊所方法具有较高的定位精度。全部硬件在SYS 29/10A位片开发系统中调试通过,并获得了满意结果。     

试论信息社会高校图书馆馆员的角色转换

把握时代脉搏，融入信息社会。图书馆正处于传统型向信息化、自动化转变的转期型。馆员应实现角色转换，重构馆员的素质观。     

数字时代的艺术设计发展

在从古老的文化艺术中数学就被有意识的应用，使艺术呈现出一种理性的美。数字时代，随着计算机行业的发展，Photoshop，CorelDRAW、AutoCAD、3dsMAX等一系列设计软件的出现，对艺术设计的发展起到了推动作用，艺术设计与计算机紧密结合，艺术设计的表达依靠计算机来实现，这也将是未来发展的趋势。     

Non-coherent noise reduction in digital holography based on root mean square technique

In this paper, the root mean square (rms) technique is applied in order to reduce the non-coherent noise in phase-contrast image. The proposed technique is applied to a sample of 200 μm step height nominally. The recorded off-axis interferograms generated from two different wavelengths are processed to obtain an object wave (amplitude and phase) for each wavelength separately. The independent phase maps are subtracted and a phase map for the beat-wavelength is obtained and converted to height map. The rms values of 10 pixels profiles from the obtained height map are calculated automatically to show the three-dimensional (3D) profile. The experimental results show that the non-coherent noise is reduced by the order of 90% when the rms technique is applied and the uncertainty in measurement has been found to be of the order of 1.5 μm. The proposed technique can provide a simple and real solution for measuring 3D objects having high abrupt height difference.     

关于数字环境中电子刊物的几个问题

建设和管理在数字环境中收集到的电子刊物对于图书管理员来说是一个创新的课题,因为电子刊物存在于复杂不断变化的状态中,这些状态包括不同的数字形式、不同的访问途径、新的价格结构。本文着重讨论的是电子刊物的未来发展趋势,它包括：电子刊物的开放访问、电子刊物收藏的持续性发展、以及为了更好的进行学术性交流,图书馆藏书的管理。     

图书馆人性化服务的探索与实践——以长春图书馆为例

从人性化的服务方式、人性化的服务内容、人性化的阅览环境、人性化的服务设施等方面探讨了近年来长春图书馆实行人性化服务的实践做法,同时指出了人性化服务需要改进的方面。     

ICOLC应对经济危机的策略及其对我国图书馆联盟的启示

概述了ICOLC一月声明发出的背景,阐述了ICOLC一月声明的内容与应对策略,探讨了ICOLC一月声明对我国图书馆联盟的启示。     

简论打印复印技术在黄山学院图书馆的应用

介绍了打印复印技术在黄山学院图书馆工作几个方面的重要作用,认为打复印工作对丰富馆藏、提高服务质量有着重要的意义。     

基于总分馆架构的图书馆结构调整——公共图书馆发展的必由之路

文章通过论述图书馆总分馆制在图书馆事业发展中的意义，具体分析了总分馆制的特点和存在的问题，指出了在当前情况下实行总分馆制，应根据当地实地情况因地制宜，稳步推进图书馆的体制变革。     

Polyhedral approximation and practical convex hull algorithm for certain classes of voxel sets

In this paper we introduce an algorithm for the creation of polyhedral approximations for certain kinds of digital objects in a three-dimensional space. The objects are sets of voxels represented as strongly connected subsets of an abstract cell complex. The proposed algorithm generates the convex hull of a given object and modifies the hull afterwards by recursive repetitions of generating convex hulls of subsets of the given voxel set or subsets of the background voxels. The result of this method is a polyhedron which separates object voxels from background voxels. The objects processed by this algorithm and also the background voxel components inside the convex hull of the objects are restricted to have genus 0. The second aim of this paper is to present some practical improvements to the discussed convex hull algorithm to reduce computation time.