共查询到19条相似文献,搜索用时 156 毫秒
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光信息科学与技术实验室建设的几点思考 总被引:2,自引:0,他引:2
本文结合我校光信息科学与技术专业实验室建设的实践经验,从实验室建设的指导思想、建设目标、建设内容等方面,全面阐述了我校光信息科学与技术的整体思路和具体做法. 相似文献
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论述了偏振型干涉成像光谱仪的工作原理, 针对复原光谱谱线位置漂移问题, 提出了原理修正和数据处理两种具有代表性的实验室谱线位置定标方法, 给出了定标结果及对比分析. 原理修正方法从干涉型成像光谱仪的参数选择着手, 分析了产生谱线位置漂移的原因, 针对复原谱线位置随行变化的问题, 给出了修正方案, 使得谱线位置精度明显提高; 对于给定的四组激光器标准波长, 谱线位置均方根误差由定标前的28.3914下降至5.5371, 该方法对干涉型成像光谱仪具有普适性, 且其定标参数对分析仪器指标提供了便利. 数据处理方法弥补了原理修正定标存在的数据量大、短波定标效果弱等弊端, 谱线位置均方根误差下降至0.9178, 该方法实施简单, 对不同的输入波长, 所取不同行的数据用统一的表达式进行修正. 该方法化繁为简、间接定标的思想具有一定的借鉴价值. 该研究为偏振型干涉成像光谱仪的设计、研制、调试和工程化提供了重要的理论依据和实践指导. 相似文献
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One of the few predictions from quantum gravity models is Sorkin's observation that the cosmological constant has quantum fluctuations originating in the fundamental discreteness of spacetime at the Planck scale. Here we present a compelling analogy between the cosmological constant of the Universe and the surface tension of fluid membranes. The discreteness of spacetime on the Planck scale translates into the discrete molecular structure of a fluid membrane. We propose an analog quantum gravity experiment which realizes Sorkin's idea in the laboratory. We also notice that the analogy sheds light on the cosmological constant problem, suggesting a mechanism for dynamically generating a vanishingly small cosmological constant. We emphasize the generality of Sorkin's idea and suggest that similar effects occur generically in quantum gravity models. 相似文献
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George A. Baker Jr. 《Journal of statistical physics》2003,110(3-6):971-979
We examine the intuitive, classical idea that an interactive system involving commonly used attractive potentials should always have a pressure which is less than that of an ideal Fermi gas. We find that quantum effects are of crucial importance and that, while this idea is normally correct, under certain circumstances, the pressure can exceed that of the ideal Fermi gas. 相似文献
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近红外相关光谱的多元散射校正处理研究 总被引:10,自引:2,他引:8
近红外相关光谱法可以揭示待测成分光谱吸光度数据与浓度数据之间的全光谱线性相关性,明确待测成分在近红外波段的特征吸收位置,为定标波长的优选提供了依据。但是该相关光谱法极易受到样品颗粒的散射影响而掩盖与待测成分相关的光谱信息。文章首先提出将原始近红外光谱数据进行散射校正处理后再参与相关运算得到散射校正相关光谱的思想,经过实验验证得到的散射校正相关光谱有效地降低了散射的影响,提高了相关光谱的信噪比,更加准确地表征了待测成分吸光度数据与浓度数据之间在近红外全光谱通道的线性相关性。 相似文献
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Y. Qiu 《Journal of sound and vibration》2003,264(1):135-155
The transmission of fore-aft vibration to the seat cushion and backrest of a small car has been investigated by means of a field test and laboratory simulation methods. In the field test, transmissibilities to the seat backrest and the seat pan were computed using both single-input single-output and two-input one-output system models. The results showed that in the car the fore-aft vibration at the seat pan and the backrest depended not only on the fore-aft vibration of the floor but also on the vertical vibration of the floor. In the laboratory simulation, the transmissibilities were measured with 12 subjects and five different vibration stimuli. It was found that the fore-aft transmissibilities to both the backrest and the seat pan exhibited three resonance frequencies in the ranges 4-5, 25-30 and 45-50 Hz. The laboratory test also revealed that for the backrest and the seat pan, the resonance frequencies and the peak transmissibility at resonance changed with vibration magnitude, indicating non-linearity involving both seat-person systems. The field test and the laboratory test methods have different advantages. The correct vibration input spectra and the correct subject posture can be used in a field test, whereas a higher coherency can be obtained using the laboratory test. It was found that the low coherency in the field test when using the single-input and single-output assumption could be improved by adopting a two-input and one-output system model. 相似文献
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《声速测定》是大学物理实验中比较普遍的一个综合性实验。在声速测定实验仪的基础上,改进了信号源,并制作了声悬浮配件,使其实现既可以用多种方式测量声速,又可演示声悬浮实验现象。声悬浮及声速测定实验仪悬浮稳定性强,声速测定准确,仪器造价低,使用方便,这样设计节省了实验室资源和空间。 相似文献
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M. Gogberashvili A.B. Kobakhidze A. Tureanu 《The European Physical Journal C - Particles and Fields》2006,47(3):857-860
We argue that a certain distribution of matter in higher dimensions can provide the correct behavior of gravity in four dimensions.
Some explicit examples illustrating the idea are considered. 相似文献
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JETP Letters - We present a brief review of experimental status in searching for hypothetical sterile neutrino in nuclear decay in laboratory testing. The main idea is based on search for an... 相似文献