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广播作为传统媒体,在历史的滚滚洪流中,不仅没有消亡,却愈加显得生机勃勃,这得益于节目不断推陈出新,得益于广播与新技术的紧密融合。譬如,听众如今可以通过微信公众平台参与节目的互动,节目中主持人则在其中抽选留言予以播放,本文简要概述在微信互动音频播放中,播放系统的设计与调试。 相似文献
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Based on planar Si dual-base transistor conception, a novel mesa dual-base heterojunction bipolar transistor （ HBT） is designed and fabricated. Molecule beam extension, selective wet chemical etching, common contact photolithography and metal lift-off technique are adopted in the process. The device has particular and distinct voltage-controlled negative differential resistance （NDR） and photo-controlled NDR. The highest peak-to-vally current rate of the voltage-controlled NDR is larger than 148 and the peak current varies with the increase of collector voltage. The device features high speed and high frequency characteristics derived from HBT and intrinsic bistability and self-latching characteristics due to NDR. A single dual-base HBT can be seen as an integration of NDR device, HBT and photoconductive device. Compared with common HBT,the groove is the key factor producing NDR. 相似文献
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浅谈移动基站防雷地网设计 总被引：1，自引：0，他引：1
结合多年移动基站防雷地网的建设及维护经验,切实地提出根据实际情况设计移动通信基始防雷地网系统的设计思想和方法. 相似文献
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李江洪 《柳州职业技术学院学报》2006,6(2):77-81
无线接入点是无线接入网络的关键设备,负责对移动主机进行管理以及协调无线网络与有线网络之间的通信。本文通过分析IEEE 802.11.IEEE 802.3等协议和Internet工程部的有关建议,从硬件和软件结构两方面设计并实现了无线接入点系统。同时为了使移动节点在无线局域网中进行快速有效的切换,提出了快速移动切换方案,减少了移动节点内的切换过程的注册时延和数据包的丢失。 相似文献
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Theresonanttunnelingdiode (RTD) [1] isahigh speednanoelectronicdevicebasedonquantumresonanttunnelingeffect.Ithastheadvantagesofhighspeed,highfrequency ,lowoperatingvoltage,low powerdissi pation,intrinsicbistabilityandself latchingduetoitsnegativedifferentialresistance .Comparedwithconven tionaldevice,ithasthefeatureofreducingthenumberofdevicesandcircuitcomplexityforachievingthesamelog icfunction . TheMOBILE[2 ,3 ] isalogicelementrealizingthemonostable bistabletransitionofacircuitthatcon… 相似文献
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