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High-Resolution Broadband Millimeter-Wave Astrophysical Spectrometer with Triple Product Acousto-Optical Processor 被引量:1
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作者 Miguel Chavez Dagostino Alexandre S. Shcherbakov +1 位作者 Adan Omar Arellanes Vahram Chavushyan 《International Journal of Astronomy and Astrophysics》 2013年第4期421-430,共10页
An advanced conceptual design of a high-bit-rate triple product acousto-optical processor is presented that can be applied in a number of astrophysical problems. We briefly describe the Large Millimeter Telescope as o... An advanced conceptual design of a high-bit-rate triple product acousto-optical processor is presented that can be applied in a number of astrophysical problems. We briefly describe the Large Millimeter Telescope as one of the potential observational infrastructures where the acousto-optical spectrometer can be successfully used. A summary on the study of molecular gas in relatively old (age > 10 Myr) disks around main sequence stars is provided. We have identified this as one of the science cases in which the proposed processor can have a big impact. Then we put forward triple product acousto-optical processor is able to realize algorithm of the space-and-time integrating, which is desirable for a wideband spectrum analysis of radio-wave signals with an improved resolution providing the resolution power of about 105 - 106. It includes 1D-acousto-optic cells as the input devices for a 2D-optical data processing. The importance of this algorithm is based on exploiting the chirp Z-transform technique providing a 2D-Fourier transform of the input signals. The system produces the folded spectrum, accumulating advantages of both space and time integrating. Its frequency bandwidth is practically equal to the bandwidth of transducers inherent in acousto-optical cells. Then, similar processor is able to provide really high frequency resolution, which is practically equal to the reciprocal of the CCD-matrix photo-detector integration time. Here, the current state of developing the triple product acousto-optical processor in frames of the astrophysical instrumentation is shortly discussed. 展开更多
关键词 Astrophysical Instrumentation Radio-Astronomy MILLIMETER-WAVE SPECTROMETER space-and-time integrating Acousto-Optical Devices Optical Processing System
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论唐代审美意象时空建构的佛禅心理
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作者 初娇娇 《中国美学研究》 2022年第2期106-119,共14页
唐代审美意象时空建构蕴藉着深刻的佛禅心理,体现为唐人在意象创构中将时空进行审美化塑造。佛禅“无住无念”以及“自性虚空”的心理图式在审美意象创构中展现了时、空的诗情拓展,它赋予唐代美学以全新质素,将审美意象时空建构导向了... 唐代审美意象时空建构蕴藉着深刻的佛禅心理,体现为唐人在意象创构中将时空进行审美化塑造。佛禅“无住无念”以及“自性虚空”的心理图式在审美意象创构中展现了时、空的诗情拓展,它赋予唐代美学以全新质素,将审美意象时空建构导向了主体心灵与世间万象相融共生的审美境域。从时间上来看,禅宗“无住无念”心理在唐代美学中呈现为心源与直觉的意象时间思维模式。时间在佛禅世界中完全打破了绵延理路,而是转向空观,即在破执中顿悟瞬间永恒的真理。在空间层面,受佛禅“自性虚空”心理影响的唐代意象空间追求博大与超越,文人对审美空间塑造蕴藉着禅意与空灵,走向了心灵自由的诗性场域。在时间与空间心理结构和感知方式基础上形成了“时空一如”的审美境界,将内我与外境浑然合一,展示了唐人独特的宇宙观和意象观。 展开更多
关键词 佛禅心理 唐代意象时空 无住无念 自性虚空 时空一如
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用于时空综合被动定位的种子分裂算法 被引量:1
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作者 代志恒 袁富宇 杨大伟 《指挥控制与仿真》 2007年第2期33-37,共5页
针对传统TMA方法的局限性,运用时空综合被动定位(STI)理论,探索如何利用拖线阵列声纳的基阵探测信息估算目标运动要素。采用种子分裂算法(SDA)原理,通过选取合适的初始种子,进行高效率的穷举,从而得出最优解。经过仿真计算及分析发现,... 针对传统TMA方法的局限性,运用时空综合被动定位(STI)理论,探索如何利用拖线阵列声纳的基阵探测信息估算目标运动要素。采用种子分裂算法(SDA)原理,通过选取合适的初始种子,进行高效率的穷举,从而得出最优解。经过仿真计算及分析发现,与遗传算法相比较,计算量大大缩小;本艇不机动时,即使在低信噪比的情况下,该算法既满足了可靠性的要求,又缩短搜索迭代过程。 展开更多
关键词 时空综合被动定位 种子分裂算法 遗传算法
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