基于二极管-电容倍压单元的DC-DC升压变换器

文章基于二极管-电容倍压单元,提出了一种新型高增益升压变换器。该拓扑在实现高增益的同时可以避免使用极大的占空比,并且有效地降低开关管和二极管的电压应力。分析了变换器的工作原理,推导了变换器工作在连续状态（CCM）和断续状态（DCM）下的电压增益、开关器件的电压应力和电感电流纹波。CCM状态下与传统的Boost变换器相比电压增益是其（5-D）倍,电感电流纹波近似减小为原来的一半。最后通过仿真与样机实验验证了理论分析的正确性,表明提出的变换器具有良好的综合性能。     

马钢直弧型板坯连铸机的设计

介绍了马钢 2 5 0 mm× 1 40 0 mm直弧型坯连铸机设计指导思想、连铸机主要技术性能指标、工艺流程、设备组成及采取的技术措施 :无氧化浇注 ,连续弯曲矫直 ,二冷区气雾冷却及自动控制 ,在线短定尺二次切割 ,对称式双向出坯 ,防止测量基准移位和台阶式对弧样板等。     

基于细胞元分割技术的协同特征造型系统的研究

针对基于瘦客户端结构的协同特征造型系统需要在服务器和客户端来回持续地传输大量数据流,网络代价很高,本文提出利用细胞元分割技术且采用B／S结构构造协同框架,进行协同造型的方法。并给出了系统设计及系统主要组件的功能。由于客户端向服务器发送的是造型指令和参数,而服务器反馈回客户端的是一个分割后很小的变化的细胞元模型（CCM）,从而降低了网络负荷,提高了更新效率;另外,采用B／S架构使得服务器方昂贵的软硬件资源可由多个客户方承担。     

Model driven middleware: A new paradigm for developing distributed real-time and embedded systems

Distributed real-time and embedded (DRE) systems have become critical in domains such as avionics (e.g., flight mission computers), telecommunications (e.g., wireless phone services), tele-medicine (e.g., robotic surgery), and defense applications (e.g., total ship computing environments). These types of system are increasingly interconnected via wireless and wireline networks to form systems of systems. A challenging requirement for these DRE systems involves supporting a diverse set of quality of service (QoS) properties, such as predictable latency/jitter, throughput guarantees, scalability, 24x7 availability, dependability, and security that must be satisfied simultaneously in real-time. Although increasing portions of DRE systems are based on QoS-enabled commercial-off-the-shelf (COTS) hardware and software components, the complexity of managing long lifecycles (often ∼15-30 years) remains a key challenge for DRE developers and system integrators. For example, substantial time and effort is spent retrofitting DRE applications when the underlying COTS technology infrastructure changes.This paper provides two contributions that help improve the development, validation, and integration of DRE systems throughout their lifecycles. First, we illustrate the challenges in creating and deploying QoS-enabled component middleware-based DRE applications and describe our approach to resolving these challenges based on a new software paradigm called Model Driven Middleware (MDM), which combines model-based software development techniques with QoS-enabled component middleware to address key challenges faced by developers of DRE systems — particularly composition, integration, and assured QoS for end-to-end operations. Second, we describe the structure and functionality of CoSMIC (Component Synthesis using Model Integrated Computing), which is an MDM toolsuite that addresses key DRE application and middleware lifecycle challenges, including partitioning the components to use distributed resources effectively, validating software configurations, assuring multiple simultaneous QoS properties in real-time, and safeguarding against rapidly changing technology.     

语义特征模型网格重划的研究*

本文提出一个新的方法,基于原模型的网格来有效构造一个新网格。该技术利用语义特征模型具有操作局部化的特点,通过细胞元变化模型得出 (修改前/后)两个特征模型的相关部分,将原模型的复制网格节点直接关联到修正模型中,并结合对自由节点扩大自由集来进行优化过程。利用这种方法,可以在语义特征模型的几何属性中找到其固有的一致性,并且与修改前模型的网格相关联,最终在保持现有有限元的质量条件下快速产生完整质量网格。     

莱钢2号连铸机及热送热装的改造

分析了连铸机改造前和高效改造后新老系统在控制上的特点 ,着重介绍了改造后控制系统硬件和软件特点 ,该系统投运后不仅解决了本连铸机的自动控制 ,而且完成了连铸 热送 轧钢生产线的顺利贯通。     

基于两相漂移流理论的蒸汽发生器计算程序(CCM)的应用

介绍了一个建立在两相漂移流和相边界可连续移动模型基础上的、可较为全面描述单相及两相流的传热和流动的程序CCM.该程序通过"修正的有限元方法"对控制体节点之间建立联系,保证模拟效果的同时,节省了计算时间.以CCM为基础的UTSG-3程序可较好地模拟U型管蒸汽发生器的稳态和瞬态过程,可得到更为广泛的应用.通过不同运行参数的扰动研究了大亚湾核电站蒸汽发生器动态响应过程,结果显示UTSG-3程序具有模拟U型管蒸汽发生器动态行为的能力.     

济钢板坯连铸机智能扇形段(ASTC)电气控制系统的应用

济南钢铁集团总公司第三炼钢厂1#连铸机由奥钢联公司设计制造,其扇形段共14段,其中水平段(7-14段)采用智能扇形段(ASTC)。智能扇形段电气控制系统具有严密的控制逻辑及可靠的控制精度,通过对水平段辊缝的实时动态控制,可有效提高扇形段辊缝的控制精度,提高了铸坯质量。     

CORBA构件实现框架研究

构件技术已经发展成为软件复用的主流技术,CORBA构件模型是一种全新的服务器端构件模型,它鼓励通过构件组装来搭建应用系统,从而简化了CORBA应用程序的开发过程,提高了软件生产率和复用程度。该文在CORBA构件模型规范的基础上给出了一个实现框架,详细讨论了在该框架下CORBA构件的实现过程。