共查询到20条相似文献,搜索用时 78 毫秒
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虚拟现实技术是一项新兴技术,结合了多种技术如多媒体技术、计算及图形技术、网络技术、人机交互技术、仿真技术以及立体显示技术等等,前景非常的广阔。文章结合了虚拟现实技术国内外的研究现状对虚拟现实技术的发展趋势进行了分析。 相似文献
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王小卫 《电子工业专用设备》2006,35(10):24-28
概述了国内外半导体设备技术动态,介绍了光刻技术、CMP技术、膜生长技术、刻蚀技术、离子注入技术、清洗技术及封装技术的发展现状和技术趋势,预测了全球半导体制造设备未来市场变化,并提出了国产半导体设备技术创新的途径。 相似文献
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SiGe异质结晶体管技术的发展 总被引:1,自引:0,他引:1
以全球信息产业需求及技术发展为背景,回顾了以能带工程为基础的、在现代通信领域得到广泛应用的SiGe异质结晶体管技术的发展历程。介绍了分子束外延、超高真空化学气象淀积和常压化学气象淀积3种典型的SiGe外延技术并对比了这三种技术的优缺点。在此基础上,对SiGe HBT技术进行了分析总结并列举了其典型技术应用。以IBM的SiGe BiCMOS技术为例,介绍了目前主流的SiGe异质结晶体管技术-SiGe BiCMOS技术的研究现状及典型技术产品。最后对正在发展中的SiGe FET技术做了简要介绍。在回顾了SiGe异质结晶体管技术发展的同时,认为未来SiGe异质结晶体管技术的提高将主要依赖于超薄SiGe基区外延技术。 相似文献
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概述了室内空气污染物的来源、种类及其对人体健康的危害,介绍了目前室内空气净化技术有吸附净化技术、光催化技术、离子化法净化技术、臭氧法净化技术、组合净化技术,并且分析了各技术的优缺点。提出了组合净化技术已经成为今后该领域研究的一个重要方向。 相似文献
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随着我国科学技术的迅猛发展,人工智能技术也在许多领域得到了应用。而计算机相关技术作为人工智能技术的重要技术支撑,其在人工智能技术中的应用对于技术更新以及系统升级具有重要的作用。本文从人工智能技术中计算机相关技术的发展历程出发,对人工智能技术中计算机相关技术的发展方向进行了探究,并探讨了计算机人工智能技术的应用。 相似文献
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主要讲述如何通过对不良问题的原因进行深入分析及如何通过各种交叉试验,寻找真因,制定改善措施,最终使问题得到彻底解决. 相似文献
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Microwave radiometric measurements were made at wavelengths ranging from 0.8 to 2.8 cm at altitudes from 0.16 to 11 km under well documented meteorological conditions over the Bering Sea. It is shown that determinations of wind speed at the ocean surface and liquid water content of the clouds may be made from such data. Determinations were made from two simultaneous but independent sets of radiometric measurements. The wind speeds and liquid water contents made from these two sets showed remarkable agreement. Independent estimates of these parameters made from in situ measurements showed reasonable agreement as well. 相似文献
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葛澎 《微电子学与计算机》2012,29(5):201-204
分布式计算已经广泛而又深入的参透到各行各业的科技应用中.本文对几种主要的分布式计算技术,如网格、云计算、普适计算等,做了分析和比较,同时对分布式计算目前所面临的问题做了总结.最后对分布式计算技术未来的发展方向做了展望与预测. 相似文献
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To design an optical-transmission-line system, transmission characteristics of splices made by arc-fusion and V-groove methods were investigated experimentally for a graded-index optical fibre. It was found that the splice made by the arc-fusion method had a larger mode conversion than the splice made by the V-groove method for the same loss. 相似文献
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论文概述了费索干涉仪型激光波长计的原理和标定。详细分析了环境温度变化使仪器参数发生微小变化;论述了SIOM-01激光波长计以一种新颖的将标准激光引入测量光路的方法,随时对仪器参数实行单点标定,克服了由环境温度变化引进的测量误差。 相似文献
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Portable radio antenna performance on the human body was measured for several different radio models in the 150, 450, 800, and 900 MHz. bands. In-vehicle measurements were made at an outdoor antenna range equipped with a vehicle turntable. All other measurements were made in an anechoic chamber. Tests were made at the head level, at the side-level swivel-type carry case, at the side-level belt-loop type carry case, and at the shoulder level with a speaker microphone antenna. A statistical analysis was made of the data for use in coverage propagation predictions, and system designs. The results of the statistical analysis are presented 相似文献
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The major decisions made at the conference are briefly described. Additional frequency bands for shortwave (HF) radio broadcasting were agreed upon. Frequency allocations were made to support a number of US proposals, to provide advanced mobile radio services using low Earth orbit satellites. Allocations for land based mobile services adopted at WARC '92, in the range 1700 to 2600 MHz, are meant to foster improved mobile services that can be used worldwide. An allocation was also made to support commercial telephone service between passengers flying on aircraft and individuals on the ground. Allocations were made for sound broadcasting from satellites, as well as for providing a means to accommodate a complementary terrestrial-based digital audio broadcasting service. New frequency allocations to support space activities were agreed upon, and an allocation was made to the fixed satellite service in the band 13.75 to 14.0 GHz 相似文献
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Ideal passive gyrators can be made using two operational amplifiers, and it has been proved that they cannot be made with only one amplifier. However, this latter proof led to the discovery that an ideal active gyrator can be made with only one amplifier. A circuit for doing this is presented here, and its behaviour when used in an inductance-simulating mode is analysed. 相似文献