基于COM+分布式选课系统的设计与实现

随着分布构件对象技术的发展，Internet已经成为应用程序的运行环境。本文以基于COM＋的分布式选课系统为实例，讨论了如何利用面向对象的方法进行系统分析与设计及系统性能的优化，介绍了主要的设计过程和方法，并给出了利用Delphi开发工具实现此系统的一般方法。     

基于Web的3PL信息系统设计

如何降低整个供应链的物流成本并尽可能多地攫取“第三利润”是供应链与供应链之间竞争焦点,而3PL信息化是提高供应链竞争力的一种有效途径．首先研究供应链中第三方物流运作模式,进而说明第三方物流信息系统在整个供应链中的重要性．根据我国第三方物流企业应用信息系统的实际现状,基于Web的信息系统逐渐成为未来信息系统开发的主流模式,由此本文提出一种基于Web的第三方物流信息系统设计的方法,并给出Web环境下第三方物流信息系统网络结构关系图．     

Non-invasive prenatal testing as a routine procedure of prenatal care

In March 2019, the German Gemeinsamer Bundesausschuss (G‑BA; Federal Joint Committee) presented the result of the method assessment process on non-invasive prenatal testing (NIPT). The aim of this method assessment process was to decide whether NIPT should become a publicly funded procedure of routine prenatal care. The G‑BA decided in favor of NIPT, making the implementation of NIPT very likely, provided that other healthcare and political institutions also agree. This development could be interpreted as empowering from the perspective of reproductive autonomy, since NIPT allows pregnant women to obtain valuable information on the health of the fetus in a fast and easy manner and without the risks of invasive methods. However, the routinization of NIPT also implies ethical challenges. Will the routinization lead to a normalization of prenatal quality control? Will it lead to an expansion to women outside the high-risk group? What would be the ethical implications of such a development? How should physicians, geneticists, and patients deal with the increased amount of obtainable information? What are the implications for choice and decision-making in the prenatal care context? In this paper, we analyze the ethical aspects of the routinization of NIPT, focusing on information and the counseling process, the burden of choice, and the threats to reproductive autonomy by societal interests linked to NIPT.     

阴影检测技术在裁割机样片轮廓提取中的应用研究

阴影将导致轮廓提取时样片的轮廓发生扭曲变形以及部分轮廓的丢失,为了提高轮廓提取的准确性,提出了一种基于色度畸变和均值的局部多层次差分算子的阴影检测方法.新方法从彩色不变性和纹理相似性两个方面出发,通过阴影覆盖前后色度变化相对较小和纹理具有相似性的原理来确定阴影区域.实验结果表明：该方法能够有效去除样片周围的阴影,具有良好的性能.     

复合型低介电常数聚酰亚胺复合材料研究进展

聚酰亚胺具有优异的力学性能及耐热性,一直是微电子产业的重要电介质材料之一。近年来,随着微电子行业的发展和5G通讯技术的兴起,从能耗要求到信号接收等方面都对降低聚酰亚胺的介电常数和介电损耗提出更高的要求。如何在保留聚酰亚胺优异性能的同时尽可能降低其介电常数与损耗是目前亟需解决的问题。本文综述了近年来多孔聚酰亚胺和聚合物填料、无机纳米填料复合改性聚酰亚胺等复合型低介电聚酰亚胺的研究及应用进展,探讨了如何在降低聚酰亚胺介电常数的同时保持其他性能,并对其发展进行了展望,为新型复合型低介电聚酰亚胺材料的设计与制备提供新思路。     

混凝土施工中配合比的调整

普通混凝土的强度与水灰比的大小成线性关系．在混凝土施工中，实验室出具的配合比为理论配合比，即砂、石在干燥状态下的配合比；但是，实际施工中，砂、石的含水量是随气候的变化而变化的．如何控制好水灰比,保证混凝土施工质量?章介绍了施工中混凝土配合比的调整方法，以期确保混凝土在施工中的质量．     

荫罩热变形的分析与计算

本文先用有限元的迦辽金法考虑了曲面上非线性热辐射和热传导的耦合问题,计算得到荫罩、框架组件在工作状态下的温度分布情况,然后运用通用结构分析程序SAP 84计算了组件的热变形,根据电子束轨 求得着屏误差。结果符合实际情况。文中还进一步对影响着屏误差的多种因素进行了计算与分析,所得结果具有重要的实用价值。     

大空间公共建筑的被动式形态设计研究

随着大空间公共建筑建设量的增多,其对能源的消耗也越来越高.如何在设计过程中有效降低其运营能耗,尽可能利用自然能源,是设计中面临的一个重要课题.被动式形态设计是建立在与被动技术有机互动的基础上,在不依赖人工能源的条件下,通过建筑形态与能量(风能、光能等等)流动的动态性相互作用,实现建筑形态与被动技术的有机协同,从而实现大空间建筑自身节约能源的目的.     

皮影戏数字动画创作技巧解析

在保持传统皮影戏艺术特色的基础上,运用现代电脑动画技术手段,再现已处于濒危状态的皮影戏艺术．以动画作品为实例,将皮影与数字动画结合,通过对皮影戏数字动画创作技巧的解析,探讨皮影戏数字动画的情节选择、镜头的多种互动表现以及皮影戏数字动画的造型设计．将数字化的皮影平台化,使其具备皮影戏造型的表现性和故事情节的趣味性,以增强作品的艺术性,使古老的皮影戏艺术种类具有现代活力．     

Ultra low frequency waves impact on radiation belt energetic particles

One of the most fundamental important issues in the space physics is to understand how solar wind energy transports into the inner magnetosphere. Ultra low frequency (ULF) wave in the magnetosphere and its impact on energetic particles, such as the wave-particle resonance, modulation, and particle acceleration, are extremely important topics in the Earth’s radiation belt dynamics and solar wind—magnetospheric coupling. In this review, we briefly introduce the recent advances on ULF waves study. Further, we will explore the density structures and ion compositions around the plasmaspheric boundary layer (PBL) and discuss its possible relation to the ULF waves.     

基于微正则退火的频率分配方法

为了提高蜂窝移动通信网中频率资源的利用效率，提出了一种基于微正则退火算法的频率分配方法. 该方法将电磁干扰作为系统能量函数，通过一只虚拟妖在状态空间中的随机行走实现频率配置的优化. 仿真表明，在可分配频点资源充分时，该算法与模拟退火算法性能相当. 当频点资源紧张时，微正则退火算法的优越性得以体现，其搜索成功率远高于模拟退火算法，能更快地得到最优解. 仿真中典型的优化轨迹也证明了微正则退火算法具有快速收敛的特点.     

下一代Internet移动业务的搜索模式

从介绍下一代Internet的业务特点出发,提出了一种业务模式的体系结构,着重论述了一种如何为用户提供个性化业务的方法,为下一代Internet的业务模式的研究提供参考模型.     

一种基于交互式快速水平集的阴影图像分割算法

因受光源等条件的影响,采集的原始图像常常存在着阴影,用传统的水平集方法分割图像,常把阴影误认为是目标．以带阴影的栗属（板栗）果实图像为例,提出一种交互式快速水平集方法实现图像分割．实验结果表明：该算法能够得到正确的阴影图像的分割结果,具有更佳的图像分割性能．     

Parametric design strategy of a novel cylindrical negative Poisson’s ratio jounce bumper for ideal uniaxial compression load-displacement curve

A cylindrical negative Poisson’s ratio (CNPR) structure based on two-dimensional double-arrow negative Poisson’s ratio (NPR) structure was introduced in this paper. The CNPR structure has excellent stiffness, damping and energy absorption performances, and can be applied as spring, damper and energy absorbing components. In this study, the CNPR structure was used as a jounce bumper in vehicle suspension, and the load-displacement curve of NPR jounce bumper was discussed. Moreover, the influences of structural parameters and materials on the load-displacement curve of NPR jounce bumper were specifically researched. It came to the conclusion that only the numbers of cells and layers impact the hardening displacement of NPR jounce bumper. And all parameters significantly affect the structure stiffness at different displacement periods. On the other hand, the load-displacement curve of NPR jounce bumper should be in an ideal region which is difficult to be achieved applying mathematical optimization method. Therefore, a parametric design strategy of NPR jounce bumper was proposed according to the parametric analysis results. The design strategy had two main steps: design of hardening displacement and design of stiffness. The analysis results proved that the proposed method is reliable and is also meaningful for relevant structure design problem.     

基于设计模式的阴影管理模块的结构研究

给出了一种基于设计模式的游戏引擎中阴影管理模块结构的设计方法．通过对阴影管理模块的任务分析,设计了该模块的功能交互结构和算法框架结构．该设计结构的优点是,使得游戏引擎的阴影管理模块更易于使用且便于扩展,同时可以更有效地利用图形硬件所支持的高级特性．     

Relationship between attachment probability and surface energy in adhesion process of gold particles to oil-carbon agglomerates

1　INTRODUCTIONInflotationfield ,someattentionshavebeenpaidtomodelingtheprocessofflotationinordertoobtainadeepunderstandingofhowamineralparticleisat tachedtoabubble .Schulze[1] analyzedtheelementaryprocessesofflotationintermsofphysico chemistry .Anfrunsetal[2 ] studiedthebubble particleattachmentexperimentallyinthecaseofpotentialflow .Solarietal[3] investigatedtheeffectofbubblesizesonadhesionprobability .Polatetal[4 ] estimatedthetruedistribu tionofflotationrateconstantsforafirst orderkin…     

大型立式泵钟型进水流道的设计与研究

大型立式泵的钟型进水流道在我国的研究不多,缺乏成熟的设计方法。1975年以后,我们在分析钟型流道流动状态的基础上提出了设计方法,经过模型试验和生产实践的运用,证明这种设计方法可以获得良好的流态,同时完全可能设计出与肘型进水流道宽度相等、高度更小的钟型流道,可以达到同时减少施工开挖,降低工程造价、提高装置效率,节省泵站能源的目的,具有明显的经济价值。