共查询到19条相似文献,搜索用时 62 毫秒
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随着我国通信产业的迅猛发展,手机已日益普及。但是,手机中的送/受话器部分均位于机身,当手中不空时不便于操作。由国内厂家新近推出的型号为ECW-1/5系列的新一代移动电话专用微型耳机(即免提耳机),较好地解决了移动电话机使用中存在的这类问题,颇受手机用户的青睐。 相似文献
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提出了一种基于耳机key的手机银行数字证书方案.首先对手机银行数字证书在应用和科研领域的现状进行了总结,接着说明了手机耳机key的技术原理和优势,最后给出了基于手机耳机key的手机银行中数字证书的应用方案.与传统方法相比,本文的方案具备非常好的安全性和便捷性. 相似文献
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随着手机的日益普及,客户对手机售后服务要求越来越高,各手机维修中心要求有价格低廉、自动化程度高的仪表帮助维修人员迅速判定手机故障以满足客户需求。Wavetek Wandel Goltermann公司在4100系列GSM手机测试仪基础上最新推出4201S GSM手机测试。4201S可用于GSM900/1800/1900数字手机的维修检测。世界第二大通信测试厂商Wavetek Wandel Goltermann公司产品经理Wolfgang Datum指出:“新的4201S的推出,可让各手机维修中心仅花台式无线综测仪1f3的价钱,就可买到他们所需的全部GSM手机射频测试功能。” 相似文献
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用综合测试仪测量寻呼机田洪,张迎宪,陈白施伦伯杰公司生产的STABILOCK4015无线电综合测试仪是一种坚固可靠,体积轻巧,使用方便的无线电参数测量仪。该综合测试仪包括射频频率计、射频功率计、调制度测度仪、频谱分析仪、射频信号源、音频信号源、音频电... 相似文献
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Hongchao Zhang Xiangyue Ma Chuanpeng Jiang Jialiang Yin Shuqin Lyu Shiyang Lu Xiantao Shang Bowen Man Cong Zhang Dandan Li Shuhui Li Wenjing Chen Hongxi Liu Gefei Wang Kaihua Cao Zhaohao Wang Weisheng Zhao 《半导体学报》2022,43(10):102501-1-102501-9
We demonstrate in-plane field-free-switching spin-orbit torque (SOT) magnetic tunnel junction (MTJ) devices that are capable of low switching current density, fast speed, high reliability, and, most importantly, manufactured uniformly by the 200-mm-wafer platform. The performance of the devices is systematically studied, including their magnetic properties, switching behaviors, endurance and data retention. The successful integration of SOT devices within the 200-mm-wafer manufacturing platform provides a feasible way to industrialize SOT MRAMs. It is expected to obtain excellent performance of the devices by further optimizing the MTJ film stacks and the corresponding fabrication processes in the future. 相似文献
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The social history of the mobile telephone involves both the history of technological development and an account of changing
social and political frameworks into which the new technological developments become integrated. The technological innovations
of mobile telephony were established from the 1940s, but it was not until the 1990s that adoption took off. It has been claimed
that the mobile telephone revolution can be explained by changes in the way communication happens through social networks,
away from old hierarchical forms. Several unique communicative and behavioural patterns have emerged in countries with mass
use of the mobile telephone, including texting (SMS) and the development of new social norms. Nevertheless there is still
huge global variation in use and development, and more research needs to be conducted which responds to very local patterns
of use and reuse.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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手机PCB镀金接插件腐蚀失效实例分析 总被引:2,自引:0,他引:2
通过两个带有镀金接插件的手机PCB腐蚀失效的实例.从元件表面出现的腐蚀失效的现象出发.结合这些失效部位的腐蚀形貌、腐蚀产物等特点,分析了手机PCB上接插件镀金表面层在自然存放条件和加速腐蚀条件下出现腐蚀失效、达不到有效保护作用的主要原因,包括表面镀金层本身存在孔隙、划痕等表面缺陷.电镀过程中引入污染物,装配过程中形成缝隙等;另一个重要原因是镀金层厚度薄,不能提供足够的防护性能。并针对这些因素提出了相应的改善措施和建议。 相似文献
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本文通过分析WRC-15前夕俄罗斯向国际电联申报L频段航空移动台站台站的情况,详细论述了其对我国此频段内其他各业务的影响,说明了我国在L频段国际台站申报的重要意义。 相似文献
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"十一五"村村通电话工程任务圆满完成,全面实现了100%行政村开通电话、100%乡镇能上网的"双百"目标,这标志着我国的农村通信网络覆盖能力达到了一个新高度,农村信息化水平迈上了一个新台阶,这在我国通信行业的发展史上具有重要的里程碑意义。在工业和信息化部的正确领导下,在各级人民政府的关心和支持下,在各省通信管理局指导和帮助下,中国移动各族干部、员工,不畏艰险、勇担责任、艰苦奋斗、锐意进取,超额完成了工业和信息化部分配的"十一五" 相似文献
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L9320是LANWAVE公司推出的一款自适应音频脉冲编码 (ADPCM)编解码器。该器件除具有正常的ADPCM编码解码模式外 ,还有PCM编解码模式、电源测试模式以及编解码器测试模式。文中主要对L9320编解码器的工作原理和使用方法进行了分析,给出了L9320在便携式语音系统中的典型应用电路 相似文献
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In this paper we address the survivability issue of a mobile cyber physical system (MCPS) comprising sensor-carried human actors, vehicles, or robots assembled together for executing a specific mission in battlefield or emergency response situations. We develop a mathematical model to assess the survivability property of a MCPS subject to energy exhaustion and security failure. Our model-based analysis reveals the optimal design setting for invoking intrusion detection to best balance energy conservation versus intrusion tolerance for achieving high survivability. We test the effectiveness of our approach with a dynamic voting-based intrusion detection technique leveraging sensing and ranging capabilities of mobile nodes in the MCPS and demonstrate its validity with simulation validation. 相似文献