基于AMBA总线的PCIE视音频处理卡设计

PCI Express总线高性能的数据吞吐率在高速数据处理系统中,特别是在高清视音频处理系统中获得了广泛的应用。为了增强图形、图像的处理能力,这类系统常带有帧缓存。如何设计高效的存储策略,让PCIE总线的高速、宽带性能得以充分实现,是DDR2＋PCIEFPGA方案设计中面临的一个关键问题。基于广泛使用的AMBA总线,很好的解决了多个（3个）非同步、高速数据源对DDR2存储设备的竞争性访问。     

FPGA图像采集系统研究与设计

设计了一种基于FPGA与DDR2SDRAM的图像采集显示系统,该系统采用Xilinx公司Spartan-6系列的FPGA作为主控芯片,利用高带宽数据、大容量的DDR2SDRAM存储器实时地对CMOS数字图像传感器OV7670图像数据进行缓存,最后图像数据通过TFT LCD液晶显示屏实时显示出来.实验结果表明,设计并实现的图像采集系统不仅运行稳定,而且图像显示效果较好.     

基于PXI总线的高速数字化仪的设计和实现

介绍了一种基于PXI总线的高速数字化仪的设计理论和实现方法,从硬件和软件两个方面详细介绍了系统的设计方法.该采集平台基于高速模数转换器ADC08D1500和高性能可编程逻辑器件VIRTEX-4 SX35,可以实现3Gsps的实时采样率和8位的采样精度;板载512M DDR2内存模组,可以实现高速信号的实时存储;接口上采用PXI总线技术,采用PCI9054作为接口芯片;软件开发上采用DLL API的模式,方便不同用户的定制.     

基于FPGA的PCI总线图像采集卡研究与设计

随着总线技术的技术的不断进步,高速PCI总线越来越多地应用于图像采集系统中。这里在简单介绍了图像采集卡的发展状况后,以FPGA为逻辑控制中心,采用SAA7111将四路视频信号分别转换为数字图像数据,经FIFO缓存后,由PCI总线接口芯片PCI9052将数据送入计算机,最后通过应用程序将图像显示出来。实验表明,这种方案是可行的。     

基于FPGA的中频采集系统设计

为了实现中频调制信号的分析,根据软件无线电的设计思想,设计实现了基于FPGA的中频采集系统.系统以FPGA器件CycloneⅡEP2C35F67218作为核心处理芯片,利用单片FPGA实现了高速数据流的数据缓存、高速数据存储以及总线数据传输.实验表明,该中频采集系统性能稳定,操作简单,采集数据符合上层软件分析处理的要求,具有广阔的应用前景.     

基于NIOSⅡ的高分辨率图像采集系统设计

介绍了一种基于NIOSⅡ的高分辨率图像采集系统的设计.系统以NIOSⅡ软核处理器为主控制器,配合高像素CMOS图像传感器、大容量SDRAM、高速DAC器件,实现高速高分辨率数字图像采集与实时显示.详细阐述了将Bayer图像转化为RGB图像的算法原理及其FPGA硬件实现,同时还给出了系统中其他各模块的FPGA硬件实现及其时序仿真图.系统提供了灵活的图像数据传输接口,可满足大多数工业应用.     

世界上速度最快的DDR3插补器

FuturePlus Systems公司日前为下一代双倍数据速率(DDR)SDRAM总线推出FS2355 DDR3 1333插补器预处理器。这款世界上速度最快的插补器是为用于泰克TLA7000系列逻辑分析系统设计的,以增强1333DIMM卡调试,改善最新的高性能     

S5933 PCI控制器在高分辨力成象光谱仪数据采集中的应用

为了实现高分辨力成象光谱仪（ＨＲＩＳ）中的遥感图象集工作,本文采用由高速信号处理电路、基于Ｓ５９３３ＰＣＩ总线控制器的数据采集卡、高速磁带机等组成的记录处理系统,解决了高分辨力、大容量、多光谱图象采集及实时处理的问题,并成功应用于ＨＲＩＳ机载系统中。     

基于PCI总线的高速数据信号模拟器的实现

讨论了利用PCI总线实现硬目标侵彻引信半实物仿真系统中数据传输的优点,提出了一种基于PCI总线的高速数据信号模拟器的设计和实现方法.主要介绍其硬件实现方法和驱动程序设计.该高速数据葺信号模拟器利用PLX9054作为PCI总线接口芯片,用FPGA(现场可编程门阵列)作为系统控制核心,采用先入先出(FIFO)技术、DMA(直接存储器存取)数据传输方式,以及高速D/A(数/模)转换器完成高速模拟信号输出,主要解决了硬目标侵彻引信半实物仿真系统中过载信号的模拟.     

VXI总线中数据快速传输的实现

本课题是基于TXI总线的高速数据测试模块设计的一部分。测试数据在VXI总线中的传输速度是该测试模块性能的重要指标。为了在VXI总线的模块之间进行大块数据传送，VXI总线规定了实现数据块传输的高速数据通道（FDC）协议。本文讲述了如何在VXI总线模块之间实现大量数据快速传输，包括原理介绍及硬件电路设计。设计充分利用高性能FPGA中FIFO IP core的优点，保证数据快速，稳定的传送。文章对设计过程中出现的问题进行讨论并提出解决方案。     

检定和校准证书的异同与应用

本文介绍了检定和校准以及证书的两点相同、五点不同之处,说明了对检定证书和校准证书的正确应用。     

Heat and Mass Transfer and Modeling and Prediction of Environmental Catastrophes

Basic definitions and concepts of the physicomathematical theory of natural catastrophes are given. Possibilities of mathematical modeling of natural and technogenic catastrophes are discussed in the context of the theory of heat and mass transfer and the mechanics of reacting media. The importance of taking into account conjugate heat and mass exchange in modeling catastrophes is emphasized. A formula for evaluating the probability of a collisional catastrophe is given.     

凝固科学技术与材料

从凝固科学与实践发展的角度介绍了当前凝固材料体系的基本框架和凝固科学主要发展阶段的基本理论。作为材料科学与工程的基本组成，凝固科学技术正在现代科学理论的基础上针对传统材料的改性提高和新材料的发展需求，以控形、控构、控性为目标开展优质铸件的定向、晶体生长、快凝、深过冷及各种新型和超常领域凝固过程的研究，并介绍了其中某些方面和展望了可能的发展趋势。     

Multi-ferroic and magnetoelectric materials and interfaces

The existence of multiple ferroic orders in the same material and the coupling between them have been known for decades. However, these phenomena have mostly remained the theoretical domain owing to the fact that in single-phase materials such couplings are rare and weak. This situation has changed dramatically recently for at least two reasons: first, advances in materials fabrication have made it possible to manufacture these materials in structures of lower dimensionality, such as thin films or wires, or in compound structures such as laminates and epitaxial-layered heterostructures. In these designed materials, new degrees of freedom are accessible in which the coupling between ferroic orders can be greatly enhanced. Second, the miniaturization trend in conventional electronics is approaching the limits beyond which the reduction of the electronic element is becoming more and more difficult. One way to continue the current trends in computer power and storage increase, without further size reduction, is to use multi-functional materials that would enable new device capabilities. Here, we review the field of multi-ferroic (MF) and magnetoelectric (ME) materials, putting the emphasis on electronic effects at ME interfaces and MF tunnel junctions.     

CellML and associated tools and techniques

We have, in the last few years, witnessed the development and availability of an ever increasing number of computer models that describe complex biological structures and processes. The multi-scale and multi-physics nature of these models makes their development particularly challenging, not only from a biological or biophysical viewpoint but also from a mathematical and computational perspective. In addition, the issue of sharing and reusing such models has proved to be particularly problematic, with the published models often lacking information that is required to accurately reproduce the published results. The International Union of Physiological Sciences Physiome Project was launched in 1997 with the aim of tackling the aforementioned issues by providing a framework for the modelling of the human body. As part of this initiative, the specifications of the CellML mark-up language were released in 2001. Now, more than 7 years later, the time has come to assess the situation, in particular with regard to the tools and techniques that are now available to the modelling community. Thus, after introducing CellML, we review and discuss existing editors, validators, online repository, code generators and simulation environments, as well as the CellML Application Program Interface. We also address possible future directions including the need for additional mark-up languages.     

Synthesis and luminescent properties of alkali-metal and ammonium fluorosulfatozirconates and fluorosulfatohafnates

We have synthesized a variety of alkali-metal and ammonium fluorosulfatometallates (titanates, zirconates, and hafnates). The alkali fluorosulfatozirconates and fluorosulfatohafnates have been shown to exhibit efficient roentgenoluminescence (RL) in the UV through visible spectral region, with a maximum at 390–440 nm. Their RL spectra depend significantly on their composition (cation, anion, and water content), coordination of KF and K₂SO₄, and relative amounts of fluorine and SO₄ groups. We have examined the effect of heat treatment on the RL of these compounds. The rubidium and cesium fluorosulfatozirconates Rb₃Zr₂F₉SO₄ · 2H₂O, Cs₂ZrF₂(SO₄)₂ · 2H₂O, Cs₈Zr₄F₂(SO₄)₁₁ · 16H₂O, and Cs₂ZrF₄SO₄ offer the most efficient RL.     

热交换器的分类及优缺点分析

热交换器是将不同温度介质之间的热量通过热传导的形式,由高温介质传递给低温介质,使介质达到生产所需温度的工艺设备,也可作为一种节能设备使用.通过对不同热交换器的结构分析,总结不同热交换器的优缺点、适用环境,为生产工艺设计人员及设备制造单位在选择可降低能耗、提高效率的设备上提供参考.