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We investigate the fourth-order spatial correlation properties of pseudo-thermal light in the photon counting regime, and apply the Klyshko advanced-wave picture to describe the process of four-photon coincidence counting measurement. We deduce the theory of a proof-of-principle four-photon coincidence counting configuration, and find that if the four randomly radiated photons come from the same radiation area and are indistinguishable in principle, the fourth-order correlation of them is 24 times larger than that when four photons come from different radiation areas. In addition, we also show that the higher-order spatial correlation function can be decomposed into multiple lower-order correlation functions, and the contrast and visibility of low-order correlation peaks are less than those of higher orders, while the resolutions all are identical. This study may be useful for better understanding the four-photon interference and multi-channel correlation imaging. 相似文献
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肾性贫血是维持性血液透析(MHD)患者的重要临床表现,促红细胞生成素(EPO)分泌减少是肾性贫血的主要原因。长期以来,微炎症状态、肾性贫血是影响MHD患者透析及生存质量的重要因素之一。重组人促红细胞生成素(rHuEPO)是临床上治疗肾性贫血的主要药物,超过90%的慢性肾病患者应用rHuEPO后肾性贫血可有明显改善,但部分患者存在对EPO的低反应性[1]。近年研究发现,MHD患者微炎症状态可影响EPO的治疗效果。现将我院应用rHuEPO治疗微炎症状态MHD患者肾性贫血的效果报道如下。 相似文献
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Based on the Bayesian information criterion, this paper proposes the
improved local linear prediction method to predict chaotic time
series. This method uses spatial correlation and temporal
correlation simultaneously. Simulation results show that the
improved local linear prediction method can effectively make
multi-step and one-step prediction of chaotic time series and the
multi-step prediction performance and one-step prediction accuracy
of the improved local linear prediction method are superior to those
of the traditional local linear prediction method. 相似文献
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与助催化剂形成异质结,通过调整活性位点的电子结构和电荷输运来提高Ni2P的电催化活性是一种可行的方法。本文成功构建了一种高效的Cu3P/Ni2P异质结催化剂,其中Cu3P本身仅作为助催化剂,通过调节Ni2P的电子转移和表面重构来提高电催化活性。结果表明,在10 mA·cm-2的电流密度下,Cu3P/Ni2P具有优异的析氧反应(OER)活性,过电位为213 mV。结合实验结果和理论计算可知,Cu3P助催化剂可以有效调整Ni中心的电子结构,实现电荷重分布,降低反应能垒,从而显著提高OER催化活性。此外,Cu3P助催化剂诱导的丰富的晶界和晶格畸变促进了表面重构,形成Ni5O(OH)9,为OER提供了有效的活性位点。本工作通过引入助催化剂构建了一种新型异质结电催化剂,为优化过渡金属磷化物的电催化性能提供了一条有效途径。 相似文献
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指纹作为接触类犯罪案件现场最常见的痕迹之一,基于其形态学价值及承载的物质进行分析是个体识别、侦查破案的重要手段。飞行时间二次离子质谱技术(TOF-SIMS)是一种兼具高质量分辨率和高空间分辨能力的表面分析技术,能够同时获得待测物质的质谱信息和成像分布。相较于其他理化分析技术,TOF-SIMS所具备的快速检验、无需前处理、原位近无损分析等优势使其逐渐成为指纹分析领域的前沿课题。该文基于TOF-SIMS在成像增强、物质分析、犯罪信息挖掘等指纹分析领域的研究现状展开综述,分析其在公安实战中的应用前景,以期为该技术在指纹检验领域的推广奠定基础。 相似文献
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