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排序方式: 共有146条查询结果,搜索用时 46 毫秒
1.
本文通过对光存储系统出错特性的分析,研究了一些描述出错特性的主要参数,并且给出了描述出错特性的Gilbert模型及其改进型模型。 相似文献
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路玲霞 《计算机工程与应用》2012,48(25):57-60
设L是一个完备剩余格,定义了定向完备偏序集上的Hohle意义下的满层L-拓扑,称之为模糊Scott拓扑;基于满层的L-滤子,建立了相应的Scott收敛理论。证明了一个定向完备偏序集是连续的当且仅当对于每一个满层的L-滤子,其Scott收敛等价于按模糊Scott拓扑收敛。 相似文献
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Alex McDowell 《Architectural Design》2015,85(4):26-33
Film production requires world building: the power to visualise and bring to life narrative through a film's total environment. This is often entirely speculative, imagining alternative or future worlds. Here, Alex McDowell , acclaimed British production designer, producer and Professor at the University of Southern California (USC) describes his world-building, narrative approach to production design, which he consolidated in the Steven Spielberg film Minority Report (2002) that envisioned Washington DC in the year 2050. The possibilities of this storytelling technique are demonstrated by its transference into real-life projects, such as the immersive model that his production company, 5D GlobalStudio, developed for Al Baydha, a Bedouin village in Saudi Arabia. 相似文献
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Kevin Mitchell 《Architectural Design》2015,85(1):38-45
Despite a distinguished heritage of learning in the Middle East, the expansion of provision for higher education is currently at an unprecedented scale. The Gulf States, in particular, are seeking to keep up with accelerated population growth and a demographic ‘youth bulge’. Guest-Editor Kevin Mitchell describes the architectural approaches employed in the design of institutions in the region from the first universities in Saudi Arabia to Foster + Partners's ground-breaking sustainable design for the Masdar Institute in Abu Dhabi and future projects. 相似文献
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A unified noise figure expression incorporating the thermal noise and flicker noise has been proposed for active CMOS mixers. Based on the derived conversion functions with output resistance effect, the noise transforming factors for different stages are numerically computed to rigorously describe the noise output. The subthreshold conductance has also been taken into account by utilizing the latest continuous noise model and the simplified MOSFET I-V model. As a result, the frequency-dependent characteristic of noise expression is of competency for explaining the flicker noise mechanism, thus can be directly applied to active CMOS mixers with any IF characteristics. And good agreement is obtained between simulations and measurements. 相似文献
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采用0.5μmpHEMT工艺研制了Gilbert式单片混频器,设计采用了电流注入技术及跨导级源端负反馈技术,在C波段测试表明:变频增益大于1.5dB,单边带噪声系数典型值为12.5dB,变频带宽约为DC~1GHz,所需本振功率实测值为1.6dBm。 相似文献
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The preliminary results of a project that is currently investigating the nature and range of meanings of Antarctic heritage are explored. The project involves two visits to Scott Base, and the subjects of the qualitative research are the members of the New Zealand Antarctic community. Work so far suggests that different meanings do exist, and a four-fold typology of meanings is suggested which needs to be considered in decisions affecting the future of Antarctica. 相似文献
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用于2.4GHz无线局域网收发机的CMOS混频器 总被引:9,自引:6,他引:3
描述了采用CMOS工艺技术,用于2 .4GHz无线局域网收发机的上变频器/下变频器的实现.由于采用class-AB类工作模式的输入级,该下变频器具有很高的线性度.同时,该输入级也完成了输入阻抗匹配和单端信号到差分信号的转换功能.它们采用0 .18μm CMOS工艺实现.为了说明它们的性能,文中给出了每个模块的测试结果. 相似文献