LED照明将开启智能化时代

本文介绍了LED智能照明的技术趋势。本文网络版地址:http://www.eepw.com.cn/article/145623.htm     

火控文摘

136.法国机载红外光电系统/顾聚兴∥红外、—1985(5)、—22～23光电系统一般由三种基本工作原理不同的技术方法所构成:即光增强技术,红外热成象技术和激光技术.其中红外热成象技术是光电系统的主要技术手段.因此可称为红外光电系统.本文所叙述的机载红外光电系统包括:火控系统,导航和探测系统,侦察系统和自动导引装置.137.平视显示器的发展趋势/孙涵芳∥国际航空.—1985(5).—48～50     

耦合电感技术的优势

本文通过分析耦合电感技术优势,比较耦合电感技术与传统电感技术的设计对比,利用耦合电感提高系统性能。本文网络版地址：http：//www.eepw.com.cn/article/273276.htm     

龙芯转型:摘掉红帽子,要建生态系统

龙芯中科正在转型,从以往的政府扶持转向商业化、市场化,并看好嵌入式市场,为此,公司已补齐技术短板,努力降低成本,并在商业模式上进行探索和创新。同时龙芯也是国家战略型企业,因此十分重视生态系统的打造,希望成为处理器世界的第三极。本文网络版地址:http://www.eepw.com.cn/article/233858.htm     

GB/T 18336.1-2008《信息技术 安全技术 信息技术安全性评估准则 第1部分：简介和一般模型》概要

GB/T 18336<信息技术安全技术信息技术安全性评估准则>系列标准由以下几部分组成: -第1部分:简介和一般模型 -第2部分:安全功能要求 -第3部分:安全保证要求 GB/T 18336.1-2008等同采用国际标准ISO/IEC15408-1:2005<信息技术安全技术信息技术安全性评估准则第1部分:简介和一般模型>.G8/T 18336适用于在硬件、固件或软件中实现IT安全措施.另外,某些特殊的评估手段可能只适用于某些特定的实现方法.     

新型探测技术及其应用研讨会

正2014年8月13~15日中国长春主办单位:中国宇航学会光电技术专业委员会、微光夜视技术重点实验室会议网站:http://www.cnoenet.com/NDTA2014/征文方向:(包括以下方向,但不局限于此)紫外探测技术及应用微光探测技术及应用单光子探测技术及应用红外探测技术及应用太赫兹探测技术及应用激光探测技术及应用可见光探测技术及应用偏振探测技术及应用量子探测技术及应用多光谱/高光谱/超光谱探测技术及应用复合探测技术及应用空间探测技术及应用信号处理与检测其他应用     

电机驱动走向高效节能

本文介绍了电机驱动的最新技术动向,及部分厂商的解决方案。本文网络版地址：http：//www.eepw.com.cn/article/164380.htm     

延伸阅读

给家安上一块电池h t t p://www.china5e.com/second/cell/old/dianc.htm油价飙升、电价太贵,燃料电池成为未来家庭能源供应相对便宜的选择,也是目前最令人满意的解决方案。燃料电池的工作原理h t t p://www.bjkp.gov.cn/gkjqy/nykx/k10329-01.htm燃料电池是一种化学电池,它利用物质发生化学反应时释出的能量,直接将其变换为电能。从这一点看,它和化学电池如锰干电池、铅蓄电池等是类似的。燃料电池发电技术调研报告http://www.china5e.com/dissertation/newenergy/0058.htm本文概述了燃料电池的工作特点和原理,介绍了发电系统的组成、国内…     

一种0.1-1.2GHz的CMOS射频收发开关芯片设计

本文设计了一种低插入损耗、高隔离度的全集成超宽带CMOS射频收发开关芯片。该电路采用深N阱体悬浮技术,在1.8V电压供电下,该射频开关收发两路在0.1-1.2GHz内的测试结果具有0.7dB的插入损耗、优于-20dB的回波损耗以及-37dB以下的隔离度。本开关采用GLOBALFOUNDRIES 0.18μm CMOS工艺,芯片总面积为0.53mm2。本文网络版地址:http://www.eepw.com.cn/article/233865.htm     

支持40 Gbit/s路由器的传输技术研究

本文介绍了核心路由器40 Gbit/s高速接口的优点和传输系统为支持40 Gbit/s路由器所做的努力.例如40 Gbit/s WDM(波分复用)传输技术、40 Gbit/s IMUX(反向复用)技术等.在介绍这些技术的发展现状和优缺点的基础上,本文对40 Gbit/s传输技术的发展进行了预测.     

磁性石榴石薄膜的磁力显微镜研究

本文采用磁力显微镜（ＭＦＭ）对磁性石榴石（ＹＧｄＢｉ）３（ＧａＦｅ）５Ｏ１２薄膜的磁畴结构进行了观察研究。实验结果表明，磁性针尖的磁特性进行对石榴石ＭＦＭ图像的影响较大，而且随着针尖与样品间距的增大，磁针尖对石榴石畴结构的影响有所降低。另外，改变针尖的磁化方向，得到的石榴石磁畴结构也有所不同。     

Magnetic megabits

Improvements in recording densities that are allowing magnetic storage to pack more data than its optical counterparts are examined. The technologies that have driven the advances are discussed. They consist of highly sensitive magnetoresistive heads, ultra-low-noise magnetic media, and advanced signal detection techniques. Disk and tape performances are compared     

Multiple Magnetic States of Silicon Carbide Diluted Magnetic Semiconductors

Calculations from first principles density functional theory are used to study magnetic properties of silicon carbide doped with several percent of first row transition metal impurities. It is shown that transition-metal-doped SiC can be in either a nonmagnetic or a magnetic state. For different impurities the two states are separated by an energy gap with the width on the order of several tens of milli-electron volts or the transition between the states is gradual. We suggest that, at a high enough temperature, the relationship between the states can change or there can exist a new state which is a mix of the magnetic and nonmagnetic states. Calculated mean-field values of the Curie temperature suggest that ferromagnetic ordering at room temperature is possible in Mn-doped SiC.     

磁场中硅熔体的磁黏度

利用魔环磁场,对硅熔体施加横向可调的磁场.采用回转振荡法,测量了硅熔体在不同温度、不同水平方向磁场下的磁黏度.研究结果表明,引入磁场,使硅熔体的磁黏度增加,且磁黏度与磁场强度呈抛物线关系.     

磁场中硅熔体的磁黏度

利用魔环磁场,对硅熔体施加横向可调的磁场.采用回转振荡法,测量了硅熔体在不同温度、不同水平方向磁场下的磁黏度.研究结果表明,引入磁场,使硅熔体的磁黏度增加,且磁黏度与磁场强度呈抛物线关系.     

FePt Magnetic Nanoparticles and Their Assembly for Future Magnetic Media

Magnetic nanoparticles with extremely high anisotropy such as chemically ordered $hbox{L}1_{0}$ phase FePt nanoparticles have been considered one of the best candidates for future magnetic recording media with areal density beyond 1 ${ hbox{Tbit/in}}^{2}$ for either the nanocomposite-film-type heat-assisted magnetic recording (HAMR) media or the self-organized-magnetic-array (SOMA)-type bit patterned media. However, current preparation methods via phase transformation must overcome many obstacles, including particle agglomeration, twinning, and difficulty of easy axis alignment. In this paper, the effort on and promise of the preparation of monodispersed magnetic nanoparticles with high anisotropy by a gas phase condensation method is reviewed and reported. The focus is to review recent progress on the fabrication of monodispersed highly ordered $ hbox{L}1_{0}$ phase FePt nanoparticles without phase transformation, successfully self-assembled and magnetically aligned magnetic nanoparticles for SOMA and HAMR media. The mechanisms for directly forming $hbox{L}1_{0}$ phase FePt nanoparticles during nucleation and growth processes and magnetically aligning these particles are analyzed.      

Magnetic Field Converters Based on the Spin-Tunnel Magnetic Resistance Effect

Russian Microelectronics - The modern designs of magnetic field transducers (MFTs) based on nanostructures with the spin-tunnel magnetoresistive effect (STMR) and the main areas of their...     

Magnetic resonance imaging

Signal processing lies at the core of MRI. Data acquisition and manipulation occur naturally in the spatial Fourier transform domain of the image. A review of the imaging process and the associated image characteristics reveals the many opportunities for contributions from the signal processing community. This article develops the Fourier representation of the imaging process from an overview of the physics of the MRI signal. This article also discusses tradeoffs in acquisition time, resolution, and field of view as well as image degradation associated with noise and motion artifacts. In addition, the ability to manipulate soft tissue contrast over a wide range of independent parameters in MRI is outlined     

Magnetic recording systems

This review of magnetic recording systems concentrates on developments in two particular areas: the video-tape recorder and the rigid disk drive. The consumer VCR represents the state of the art for analog in-contact recording, while the rigid disk drive exemplifies digital recording with rapid access. Various aspects of the mechanical configurations, track-following techniques, heads and media, and signal processing are discussed. More briefly the paper describes other digital systems on flexible media.