排序方式: 共有88条查询结果,搜索用时 15 毫秒
41.
42.
43.
从模拟条件下定义的“宽带”入手,利用付里叶级数和付氏变换这一工具,说明数字通信中用到的宽带的含义指的是数据的传输速率同时利用仙农定理进一步说明信道宽带与速率的区别和联系.也论述了构成网络的几个主要部分入手,从宏观上指出了宽带网的传输途径. 相似文献
44.
45.
Madalyn Cohron 《期刊图书馆员》2013,64(1):77-86
Mapping the digital divide in America is a multifaceted issue; however, the influence of underlying socioeconomic causes, the shift in the conversation to new divides including broadband accessibility and digital literacy, and the importance of the library in narrowing the divide are all prominent points of focus in the literature today. As conversations surrounding the digital divide begin to shift from a divide in access to a divide in skills and/or literacy, attention must be drawn to meeting those needs in equal measure to maintaining access as the primary means of closing the digital divide in America. 相似文献
46.
以Z公司基于宽带薪酬机制的薪酬体系改革为切入点,详细分析了我国中小型高新技术企业薪酬管理中存在的问题并提出了相应对策。运用宽带薪酬体系的中小型高新技术企业更能提高人力资本效能,增强公司整体绩效,削弱工资向上刚性,提升公司市场竞争力。 相似文献
47.
讨论了均匀圆阵中宽带信号的谱估计问题.将目标带宽分成若干个不重叠的子频带,并将时延抽头模型方法用于均匀圆阵宽带信号的采集中,然后用MUSIC算法估计信号的来波方向.仿真结果表明该方法的有效性. 相似文献
48.
49.
设计一个金属管道中无缆探测微机器人微波供电系统,系统利用微波在圆波导中的传输基本原理,解决微波在工业不锈钢管道(直径20 mm)传输中的极化和能量传输的不稳定性问题.管道中微机器人供电单元——整流天线接收微波能量并转换成直流作为其电源,接收天线采用圆极化微带贴片天线,整流电路采用倍压电路以提高输出功率,最终试验测得在24.5 dBm输入功率下(直流负载为300Ω),整流输出86.8 mW直流功率,能够保证机器人驱动电机正常工作。 相似文献
50.
Based on a wide-ranging literature review, we argue that the information and communications technology (ICT) infrastructure has not received adequate attention for its role in the development and maintenance of industrial clusters. This article develops expectations for how firms in an industrial cluster make use of a public, broadband ICT infrastructure, particularly in support of e-commerce applications. We further address the question of whether ICT use, by enabling stronger ties to non-cluster partners, can weaken clusters. A case study of a successful biotechnology cluster in Denmark and Sweden—the Medicon Valley—is used to explore ICT use in a knowledge-intensive cluster context. We conclude that ICT use appears to strengthen rather than weaken the Medicon Valley cluster, and that firms located within a cluster appear to gain some unique advantages from their ICT usage that are not necessarily available to firms outside the cluster. 相似文献