共查询到10条相似文献，搜索用时 671 毫秒
1.
Allwood DA Xiong G Faulkner CC Atkinson D Petit D Cowburn RP 《Science (New York, N.Y.)》2005,309(5741):1688-1692
"Spintronics," in which both the spin and charge of electrons are used for logic and memory operations, promises an alternate route to traditional semiconductor electronics. A complete logic architecture can be constructed, which uses planar magnetic wires that are less than a micrometer in width. Logical NOT, logical AND, signal fan-out, and signal cross-over elements each have a simple geometric design, and they can be integrated together into one circuit. An additional element for data input allows information to be written to domain-wall logic circuits. 相似文献
2.
智能数字测微仪是一种新型的高精度量仪。该量仪采用 MCS-51系列的80C31单片机。具有多种功能,如测量功能控制,求数据平均值,报警等。它体积小、功耗低、高精度和高分辨率,使用方便。本文介绍了该量仪的工作原理、技术指标、功能和设计特点等。 相似文献
3.
Multisim软件在电子线路课程设计中的应用 总被引：1，自引：1，他引：0
结合电子线路课程设计教学实践,介绍Multisim软件在电子线路课程设计中的应用,认为应用Multisim7软件在电子线路课程设计中能优化电路设计,实现电路功能仿真及提高电路设计开发水平与分析电路的能力。 相似文献
4.
设计了一种基于谐振过渡软开关技术的变频器,以Intel87C196KC单片机为控制核心。分析了辅助谐振电路在逆变电路中的应用,给出了变频器主电路、控制电路的设计以及部分软件框图。结果表明,其具有良好的动静态性能 相似文献
5.
A technique has been developed for embedding alumina particles 0.05 micrometer in size in the surface of a polyurethane film laid on glass. This abrasive surface is used for rapid, precise, and reliable beveling of Pyrex micropipettes with tip diameters at least as small as 0.1 micrometer. In the snapping turtle retina the beveled electrodes give much better cell penetration and intracellular response stability than unbeveled electrodes of considerably higher proach to this problem. 相似文献
6.
本文介绍五轴数控系统(经济性)硬件电路的设计过程。该控制系统主要可分为四部分设计:CPU存储器扩展电路设计、显示电路设计、手动键盘和矩阵键盘电路设计以及I/O扩展电路设计。该数控系统硬件电路结构简单简单、开发成本低、可靠性高,在此基础上,进一步完善硬件,并开发控制软件,对经济型数控车床,尤其是功能要求不高的经济型车床,具有一定的应用价值。 相似文献
7.
双管掺稀油集输流程是稠油油田普遍采用的一种流程,通过对双管掺稀油集;输流程的系统分析,以初始投资与运行费用相结合的等额年费用为优化目标,建立了亿化设计的数学模型,给出了优化设计变量的约束条件及数学模型的求解方法,并编制了相应的求解软件,以实例说明了该软件的应用情况。 相似文献
8.
Edward W. Page 《Computers and Electronics in Agriculture》1985,1(1):5-29
Since the introduction of the first commercial integrated circuits nearly 25 years ago, the semiconductor industry has undergone what is now recognized as a revolution in electronics technology. Modern technology is now yielding complex circuits consisting of nearly half a million transistors on a single integrated circuit chip with a price of a few hundred dollars. Integrated circuit technology has provided increasingly capable functions at ever decreasing prices, thus resulting in ever widening areas of application. Digital system design has become a very challenging and stimulating endeavor. This paper provides insight into the nature of digital system design and integrated circuit technology. Additionally, it surveys the types of building blocks available in the commercial marketplace and discusses industry trends. 相似文献
9.
Carter JL 《Science (New York, N.Y.)》1973,181(4102):841-842
A probable vapor-liquid-solid (VLS) type of growth has been discovered for the first time in nature on the surface of lunar rock 15015. Scanning electron microprobe and energy dispersive x-ray data indicate that the growth occurs as metallic iron stalks from about 0.015 to 0.15 micrometer in diameter, with bulbous tips consisting of a mixture of iron and sulfur and measuring from about 0.03 to 0.2 micrometer in diameter. The stalk length is two to ten times the bulb diameter. 相似文献
10.
《Science (New York, N.Y.)》1980,210(4471):784-786
Twenty spectra of Io (0.26 to 0.33 micrometer), acquired with the International Ultraviolet Explorer spacecraft, have been studied. There is a strong ultraviolet absorption shortward of 0.33 micrometer that is consistent with earlier ground-based spectrophotometry; its strength is strongly dependent on Io's rotational phase angle at the time of observation. This spectral feature and its variation are interpreted as indicative of a longitudinal variation in the distribution of sulfur dioxide frost on Io. The frost is most abundant at orbital longitudes 72 degrees to 137 degrees and least abundant at longitudes 250 degrees to 323 degrees . Variations in spectral reflectivity between 0.4 and 0.5 micrometer, reported in earlier ground-based spectral studies, correlate inversely with variations in reflectivity between 0.26 and 0.33 micrometer. It is concluded that this is because the Io surface component with the highest visible reflectivity (sulfur dioxide frost) has the lowest ultraviolet reflectivity. At least one other component is present and may be sulfur allotropes or alkali sulfides. This model is consistent with ground-based ultraviolet, visible, and infrared spectrophotometry. Comparison with Voyager color photographs indicates that the sulfur dioxide frost is in greatest concentration in the "white" areas on Io and the other sulfurous components are in greatest concentration in the "red" areas. 相似文献