现场总线技术的最新进展

首先介绍了现场总线标准在经过长达１５年争论之后,终于形成一个由多部分组成的ＩＥＣ ６１１５８国际标准,随后较全面地论述了该标准所包括的八种类型现场总线的背景、特点、协议和结构。在此基础上,作者认为：当前的现场总线之争是国际上各大公司为瓜分市场而展开的保卫各自“庄园”的争斗,它已阻碍工业自动化领域网络技术的发展和产品的更新换代,并预见Ｅｔｈｅｍｅｔ／ＩＰ技术将会十分迅速地进入工业控制系统的各级网络     

客户关系管理

客房关系管理（CRM）是世界各地主要企业正在讨论的一个热点问题。随着现代企业信息化管理的不断发展,实行有效的CRM策略对企业的生存和发展显得越来越重要。本文介绍了客户关系管理的系统组成、功能、作用、技术支持等方面的内容,讨论了它的数据处理过程及未来的发展。     

Struts引入反射机制在Spring项目中的应用

本文结合一个实际的Spring项目,分析了如何将反射机制引入Struts,讨论改变后的Struts和Spring的多种整合方案,指出新的解决方案的优点和缺点,为JavaWeb项目开发提出了一种新的、完整的解决方案。     

Discrete surface Ricci flow

This work introduces a unified framework for discrete surface Ricci flow algorithms, including spherical, Euclidean, and hyperbolic Ricci flows, which can design Riemannian metrics on surfaces with arbitrary topologies by user-defined Gaussian curvatures. Furthermore, the target metrics are conformal (angle-preserving) to the original metrics. A Ricci flow conformally deforms the Riemannian metric on a surface according to its induced curvature, such that the curvature evolves like a heat diffusion process. Eventually, the curvature becomes the user defined curvature. Discrete Ricci flow algorithms are based on a variational framework. Given a mesh, all possible metrics form a linear space, and all possible curvatures form a convex polytope. The Ricci energy is defined on the metric space, which reaches its minimum at the desired metric. The Ricci flow is the negative gradient flow of the Ricci energy. Furthermore, the Ricci energy can be optimized using Newton's method more efficiently. Discrete Ricci flow algorithms are rigorous and efficient. Our experimental results demonstrate the efficiency, accuracy and flexibility of the algorithms. They have the potential for a wide range of applications in graphics, geometric modeling, and medical imaging. We demonstrate their practical values by global surface parameterizations.     

基于整体知识观的网络工程系列课程的教改研究

网络工程专业中部分专业主干课程存在很强的延续性,知识点相互渗透。本文在分析这些课程的教学现状及存在问题的基础上,以整体知识观为指导,提出了统整系列课程内容的教学改革思路,对组网技术、网络安全和网管技术三门课程的教学进行了实践探索,包括教学和实验内容的整合和优化,教学方法、实验教学和考核方式上的有益尝试。     

在数控机床设计中创造“有意味的形式”

现代数控机床外观设计,要把人的因素放在首位,从使用者的感受出发,综合其生理、心理的内涵及外延的审美情趣,赋予冰冷的机械装备以真正"有意味的形式",将机床设计本身提升到前所未有的人性化高度。机床的外观设计在"限制"中创造"有意味的形式"的关键在于:建立构成"意味"的内外因素分析的逻辑体系,抓住机床演化形式背后的系统关联,使现代机床外观设计具备更多潜在的创新力的同时,获得高层次的美感。     

基于光线跟踪的数字影像重建技术

本文讨论了CT模拟中的数字图像重建技术,提出了基于光线跟踪的处理方法,并对分辨率、CT值转换和增强技术进行了探讨,给出了在治疗计划系统中的实现。     

Synthesis of Single-Crystalline Silicon Nitride Nanobelts Via Catalyst-Assisted Pyrolysis of a Polysilazane

Recently, one-dimensional nanostructures have attracted extensive attention since they are potentially important for both applications and fundamental research. In this paper, we report the synthesis of ultra-long single crystal Si₃N₄ nanobelts via catalyst-assisted pyrolysis of polymeric precursors. The obtained products contain both α- and β-Si₃N₄ nanobelts, which are 50–100 nm in thickness, 400–1000 nm in width, and a few hundreds of micrometers to several millimeters in length. Different from previous techniques for synthesizing one-dimensional structures, the current nanobelts are synthesized through confined crystallization of an amorphous phase. A solid–liquid–gas–solid reaction/crystallization growth mechanism is proposed. The formation of nanobelts instead of nanowires is attributed to the anisotropy growth at an earlier stage.     

基于ARM和FPGA的高扩展性超声检测模块设计与实现

介绍了一种以ARM和FPGA联合作为中央控制处理单元的4路超声探伤模块。给出了其整体结构方案,阐述了以4路超声模拟信号为一组的多路超声探伤模块硬件扩展的设计思路和实现方案,讨论了FPGA对高速LVDS数据的采集、处理、时序同步功能的实现,ARM与FPGA之间总线接口的实现,ARM嵌入式系统功能以及网络通信功能的实现。实际应用表明,该功能模块能达到预期的设计要求,并能方便地实现硬件扩展。