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无人区公路平面控制网的布设方法探究
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作者 丁献龙 《测绘与空间地理信息》 2010年第2期174-175,184,共3页
无人区公路项目由于存在项目急、任务重以及交通不便等情况,不能采取常规布设平面控制网的方式进行布设。因此笔者通过不断摸索、不断总结,提出了采取因地制宜布设首级控制网,采用双动态模式布设观测加密控制网的方法。通过理论和实践证... 无人区公路项目由于存在项目急、任务重以及交通不便等情况,不能采取常规布设平面控制网的方式进行布设。因此笔者通过不断摸索、不断总结,提出了采取因地制宜布设首级控制网,采用双动态模式布设观测加密控制网的方法。通过理论和实践证明,这一方法既能满足甲方要求的工期,又能满足勘察设计的精度要求,解决了生产中的当务之急,希望本文的思路和方法对同行的工作有所帮助、有所借鉴。 展开更多
关键词 无人区 平面控制网 双动态模式 GPS
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A New CMOS Image Sensor with a High Fill Factor and the Dynamic Digital Double Sampling Technique
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作者 刘宇 王国裕 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第2期313-317,共5页
A single CMOS image sensor based on a 0.35μm process along with its design and implementation is introduced. The architecture of an active pixel sensor is used in the chip. The fill factor of a pixel cell can reach 4... A single CMOS image sensor based on a 0.35μm process along with its design and implementation is introduced. The architecture of an active pixel sensor is used in the chip. The fill factor of a pixel cell can reach 43%,higher than the traditional factor of 30%. Moreover, compared with the conventional method whose fixed pattern noise (FPN) is around 0.5%, a dynamic digital double sampling technique is developed, which possesses simpler circuit architecture and a better FPN suppression outcome. The CMOS image sensor chip is implemented in the 0.35μm mixed signal process of a Chartered by MPW. The experimental results show that the chip operates welt,with an FPN of about 0.17%. 展开更多
关键词 active pixel CMOS image sensor fill factor dynamic digital double sampling fixed pattern noise
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Generation of Superpositions of Two-Mode Coherent States for the Motion of Two Trapped Ions
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作者 ZHENG Shi-Biao 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第6X期1071-1072,共2页
We propose a method for the generation of superpositions of two-mode coherent states for the center-of-mass and relative vibrational modes of two trapped ions. In the scheme the ions are driven by a single travelling-... We propose a method for the generation of superpositions of two-mode coherent states for the center-of-mass and relative vibrational modes of two trapped ions. In the scheme the ions are driven by a single travelling-wave laser field tuned to the carrier. Then a measurement of the internal states collapses the vibrational modes to the entangled coherent state. 展开更多
关键词 superposition of two-mode coherent states trapped ion vibrational mode
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