共查询到20条相似文献,搜索用时 62 毫秒
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报道了MBE生长的GaAs材料VCSEL与MISS混合集成构成的光子开关。将MBE生长的超薄AlAs层氧化为AxOy层用作MISS器件的超薄半绝缘层,从而解决了该半绝缘层厚度的精密控制以及与VCSE工艺相容的问题。该集成器件除光子开关功能外,还能实现光放大功能,并可用于自由空间光互连。 相似文献
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商品条码在包装中的定位与印刷陈克愚POSITIONINGANDPRINTINGOFBARCODESONCOMMODITIES¥ChenKeyuAbstract:Barcodeisbringingaboutarevolutiontothecircula... 相似文献
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RADISS——面向CIMS/MIS的快速开发平台 总被引:6,自引:1,他引:5
介绍了一个CIMS环境下的管理信息系统的快速开发平台。该平台采用CLIENT/SERVER体系结构,在UNIX及WINDOWS操作系统和支持TCP/IP网络协议的环境下,提供了一组快速开发CIMS/MIS的主包括MRP、BOM处理在内的集成支持环境,可以极大地提高应用系统的开发效率,缩短应用系统的开发周期,并使应用系统具有较好的集成性和开放性。 相似文献
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《国际设备工程与管理》1997,(2)
IntroductionofIJPEMAIMSANDSCOPEheInternationalJournalofPlantEngineringandManagement(IJPEM)isanewjournalpublishedbytheNorthwes... 相似文献
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《国际设备工程与管理》1997,(4)
IntroductionofIJPEMAIMSANDSCOPETheInternationalJournalofPlantEngineringandManagement(IJPEM)isanewjournalpublishedbytheNorthw... 相似文献
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《国际设备工程与管理》1997,(3)
IntroductionofIJPEMAIMSANDSCOPEheInternationalJournalofPlantEngineeringandManagement(IJPEM)isanewjournalpublishedbytheNorthwe... 相似文献
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《国际设备工程与管理》1998,(1)
IntroductionofIJPEMAIMSANDSCOPETheInternationalJournalofPlantEngineringandManagement(IJPEM)isanewjournalpublishedbytheNorthwe... 相似文献
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提出了一种用以克服等信道间距划分、波分复用(WDM)+掺饵光纤放大器(EDFA)陆上光纤通信系统中光纤色散和四波混频(FWM)效应的新方案。采用1550nm处色散为-2.89ps/km/nm的小色散单模光纤(small-dispersionsingle-mode-fiber,SDSMF)可避免严重的FWM效应,同时利用ITU-TG.652非色散位移光纤(non-dispersion-shiftedfiber,NDSF),在EDFA整个带宽范围内(1530~1570nm)补偿SDSMF引入的负色散。采用此方案,一个10路×10Gb/s、10级EDFA级联的等信道间距(1nm)光纤通信系统,经近千公里的光纤传输后,FWM和色散引入的恶化量将分别小于1dB。 相似文献
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《国际设备工程与管理》1998,(3)
AIMSANDSCOPETheInternationalJournalofPlantEngineringandManagement(IJPEM)isanewjournalpublishedbytheNorthwesternPolytechnicalU... 相似文献
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TiO2纳米阵列(纳米管、纳米棒)结构具有良好的力学性能、化学稳定性以及抗腐蚀性能,在许多技术领域具有广阔的应用前景。采用阳极氧化法在工业纯钛片表面制备出高度有序的TiO2纳米管阵列和纳米棒阵列,研究了电解液浓度和阳极氧化时间对TiO2纳米阵列结构的影响,并对其形成机理进行了初步探讨。结果表明,低浓度的HF酸电解液有利于制备纳米管阵列,高浓度的HF酸电解液有利于制备纳米棒阵列。 相似文献
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Some aspects of the generation and detection of ultrasound with laser beams are presented. The objective of the study is (1) to present some experimental results on the generation of ultrasound with an array of optical fibers, (2) to discuss the possibility of generating directional surface waves with acousto-optic scanning in a very narrow frequency band, thus increasing the signal-to-noise ratio, and (3) to discuss the feasibility of the directional detection of ultrasound by using an array of optical fibers as a receiver, also with the goal of increasing the signal-to-noise ratio. 相似文献
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A self-focusing technique and its application to a linear array system are presented in this paper. By application of the technique the system is capable of both sonification and reception focusing. The array is first excited as an unfocused array. Next a cross-correlation technique is used to determine time delays of reception of the largest amplitude backscattered signals at the elements of the array. The original transducer signal is then reemitted with the appropriate time delays to achieve sonification focusing on the scatterer producing the largest signal. This process is repeated in an iterative mode to focus energy on the strongest scatterer. Once insonification focusing has been achieved the last time-delay calculations are used once more for reception focusing, i.e., to correct the signals received by the individual elements for differences in arrival times. A low cost linear array has been constructed to implement the self-focusing technique. Examples demonstrate the capability of the technique to focus on the largest hole of sets of three holes in an aluminum specimen. 相似文献
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