Eclipse将成为嵌入式软件主流开发环境

嵌入式软件的集成开发环境迎来了变革期。设备制造商希望有可以增加多种功能选择的开发环境。开发商提供的ICE调试程序和UML（unified modeling language）等开发工具正日益丰富。     

一种激光外差干涉非线性误差新颖测量方法

为了精确测量激光外差干涉非线性误差,提出了一种新的激光外差干涉非线性误差测量方法。通过对来自激光外差干涉测量臂的输出信号直接进行数据采集和频谱分析,分离出非线性误差的一次谐波和二次谐波分量,得到非线性误差相对测量信号之间的幅度比值;通过建立激光外差干涉非线性误差与幅度比值之间的模型,实现对激光外差干涉非线性误差的精确测量。实验结果表明,应用非线性幅度模型和频谱分析的方法能够精确地测量激光外差干涉非线性误差,相对其它测量方法具有结构简单、易于实现、避免传感器引入非线性误差等优点。     

低功耗64×64CMOS快照模式焦平面读出电路新结构

介绍了一个工作于快照模式的 CMOS焦平面读出电路的低功耗新结构— OESCA (Odd- Even SnapshotCharge Am plifier)结构 .该结构像素电路非常简单 ,仅用三个 NMOS管 ;采用两个低功耗设计的电荷放大器做列读出电路 ,分别用于奇偶行的读出 ,不但可有效消除列线寄生电容的影响 ,而且列读出电路的功耗可降低 15 % ,因此 OESCA新结构特别适于要求低功耗设计的大规模、小像素阵列焦平面读出电路 .采用 OESCA结构和 1.2μm双硅双铝标准 CMOS工艺设计了一个 6 4× 6 4规模焦平面读出电路实验芯片 ,其像素尺寸为 5 0μm× 5 0μm ,读出电路的电荷处理能力达 10 .3     

α-quartz型GeO2高压相变的分子动力学研究

采用在经典离子晶体作用势中附加Morse势,并进行必要的量子化修正,对α-quartz型GeO2结构随压力变化特性,进行分子动力学计算模拟,获得了在压力高于6.0 GPa, α-quartz型GeO2从晶相向非晶相相变的模拟结果,并利用其摩尔体积变化、键角、径向分布、配位数等重要信息对模拟结果作了深入的探讨;相变后的非晶相,由占体积66%的八面体结构和33%的四面体结构组成的非晶体,其中还有极少量的α-quartz型GeO2存在。     

基于1394接口的数字图像跟踪器设计

介绍了基于1394,MEP和DSP的数字图像跟踪器硬件平台的系统结构和实现方法,给出了DSP与1394接口芯片TSB43AA82A以及相关运算处理器MEP的连接方案及设计思路.     

高性能PCM录、放转换装置(之二)

一、特点这次试制的PCM录、放转换装置主要是为FM广播设计的双通道专用机。本机采用标准电视信号方式,广播电台使用的各种VTR(四磁头、一英寸螺旋扫描、U-matic)都能利用其信号配列。以3.07125 MHz为时钟频率,有足够的多余度,可把对照用的数据在时间序列上错开分两次记录,从而减少了失落。四磁头VTR只能用剪刀进行机械式编辑,在进行电子编辑时,为防止模拟电路引起的质量变坏,本机具有直接用数字信号进行数据转录的功能。     

超微细加工技术

一部分人把现在甚至称为第二石器(硅石器)时代,可见与硅有关的工业增长已显示出惊人的发展。特别显著的是硅半导体器件的高度集成化,作为超LSI而占有引人注目位置的256k动态RAM(随机存取存贮器)正进入大量生产阶段。像这样高集成度、高性能的LSI已能够低价格地大量供应,可以说这必将加速高度信息化时代的尽快实现。     

SAD phasing by OASIS at different resolutions down to 0.30 nm and below

Single-wavelength anomalous diffraction （SAD） phasing is increasingly important in solving de novo protein structures. Direct methods have been proved very efficient in SAD phasing. This paper aims at probing the low-resolution limit of direct-method SAD phasing. Two known proteins TT0570 and Tom70p were used as test samples. Sulfur-SAD data of the protein TT0570 were collected with conventional Cu-Kα source at 0.18 nm resolution. Its truncated subsets respectively at 0.21, 0.30, 0.35 and 0.40 nm resolutions were used in the test. TT0570 Cu-Kα sulfur-SAD data have an expected Bijvoet ratio 〈 ｜△F｜ 〉 / 〈 F 〉 ～ 0.55%. In the 0.21 nm case, a single run of OASIS-DM-ARP/wARP led automatically to a model containing 1178 of the total 1206 residues all docked into the sequence. In 0.30 and 0.35 nm cases, SAD phasing by OASIS-DM led to traceable electron density maps. In the 0.40 nm case, SAD phasing by OASIS-DM resulted in a degraded electron density map, which may be difficult to trace but still contains useful secondary-structure information. Test on real 0.33 nm selenium-SAD data of the protein Tom70p showed that even automatic model building was not successful, the combination of manual tracing and direct-method fragment extension was capable of significantly improving the electron-density map. This provides the possibility of effectively improving the manually built model before structure refinement is performed.     

新型低功耗128×128红外读出电路设计

文中介绍了一种新型的128×128红外读出电路中的低功耗设计，包括像素级和列读出级两部分。在像素级设计中，提出了一种新型四像素共用反馈放大器（ Quad-Share Buffered Injection, QSBDI）的结构：每个像素的平均功耗为500nW，放大器引入的功耗降低了30％，同时使像素FPN只来源于局部失配。列读出级采用新型主从两级放大列读出结构，其中主放大器完成电荷到电压的转换，从放大器驱动输出总线来满足一定的读出速度。通过SPICE仿真发现，与传统列电荷放大器结构相比，新型结构可节省60％的功耗。     

A New Dopant of NaN3 for High-Concentration-Nitrogen Diamond Synthesized by HPHT

Nitrogen is successfully doped in diamond by adding sodium azide （NaN3 ） as the source of nitrogen to the graphite and iron powders. The diamond crystals with high nitrogen concentration, 1000-2200ppm, which contain the same concentrations of nitrogen with natural diamond, have been synthesized by using the system of iron-carbon- additive NAN3. The nitrogen concentrations in diamond increase with the increasing content of NAN3. When the content of NaN3 is increased to 0.7-1.3 wt. %, the nitrogen concentration in the diamond almost remains in a nitrogen concentration range from 1250ppm to 2200ppm, which is the highest value and several times higher than that in the diamond synthesized by a conventional method without additive NaN3 under high pressure and high temperature （HPHT） conditions.