Spin-polarized current generated by thermal bias across a system composed of a quantum dot （QD） connected to metallic leads is studied in the presence of magnetic and photon fields. The current of a certain spin ori...Spin-polarized current generated by thermal bias across a system composed of a quantum dot （QD） connected to metallic leads is studied in the presence of magnetic and photon fields. The current of a certain spin orientation vanishes when the dot level is aligned to the lead＇s chemical potential, resulting in a 100% spin-polarized current. The spin-resolved current also changes its sign at the two sides of the zero points. By tuning the system＇s parameters, spin-up and spin-down currents with equal strength may flow in opposite directions, which induces a pure spin current without the accompany of charge current. With the help of the thermal bias, both the strength and the direction of the spin-polarized current can be manipulated by tuning either the frequency or the intensity of the photon field, which is beyond the reach of the usual electric bias voltage.展开更多
目的:通过Meta分析对亚健康偏颇体质人群体表皮肤温度变化进行探讨。方法:计算机检索中国期刊全文数据库、万方数据知识服务平台、维普期刊中文服务平台、中国生物医学文献数据库、PubMed、the Cochrance Librany、Embase、Web of Scie...目的:通过Meta分析对亚健康偏颇体质人群体表皮肤温度变化进行探讨。方法:计算机检索中国期刊全文数据库、万方数据知识服务平台、维普期刊中文服务平台、中国生物医学文献数据库、PubMed、the Cochrance Librany、Embase、Web of Science数据库,收集关于亚健康偏颇体质人群特定穴位处皮肤温度变化的相关文献,检索时限为2012年1月—2022年5月。由研究者严格按照纳入和排除标准筛选文献,提取资料并评价纳入研究的偏倚风险后,采用Rev Man 5.4软件进行Meta分析。结果:最终筛选出19篇文献,共纳入1329例病例。Meta分析结果示偏颇体质人群头面部异常区域平均温度具有明显改变,差异有统计学意义[SMD=0.36,95%CI(0.19,0.53),P<0.0001]。偏颇体质人群中焦部异常区域平均温度具有明显改变,差异有统计学意义[SMD=-0.75,95%CI(-0.79,-0.71),P<0.000 01]。偏颇体质人群督脉部异常区域平均温度具有明显改变,差异有统计学意义[SMD=0.68,95%CI(0.59,0.77),P<0.000 01]。结论:现有证据表明红外热成像技术被逐步应用于体质研究中,其在偏颇质者的体表温度特点、疗效评价等方面已取得一定的进展,可以作为偏颇体质评价的工具,它的评价方式、评价效果与体质量表相比同样突出。但是要进一步应用于临床、指导医疗实践还有待进一步扩大样本的试验研究。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61274101 and 51362031)the Initial Project for High-Level Talents of UESTC,Zhongshan Insitute,China(Grant No.415YKQ02)China Postdoctoral Science Foundation(Grant No.2014M562301)
文摘Spin-polarized current generated by thermal bias across a system composed of a quantum dot （QD） connected to metallic leads is studied in the presence of magnetic and photon fields. The current of a certain spin orientation vanishes when the dot level is aligned to the lead＇s chemical potential, resulting in a 100% spin-polarized current. The spin-resolved current also changes its sign at the two sides of the zero points. By tuning the system＇s parameters, spin-up and spin-down currents with equal strength may flow in opposite directions, which induces a pure spin current without the accompany of charge current. With the help of the thermal bias, both the strength and the direction of the spin-polarized current can be manipulated by tuning either the frequency or the intensity of the photon field, which is beyond the reach of the usual electric bias voltage.
文摘目的:通过Meta分析对亚健康偏颇体质人群体表皮肤温度变化进行探讨。方法:计算机检索中国期刊全文数据库、万方数据知识服务平台、维普期刊中文服务平台、中国生物医学文献数据库、PubMed、the Cochrance Librany、Embase、Web of Science数据库,收集关于亚健康偏颇体质人群特定穴位处皮肤温度变化的相关文献,检索时限为2012年1月—2022年5月。由研究者严格按照纳入和排除标准筛选文献,提取资料并评价纳入研究的偏倚风险后,采用Rev Man 5.4软件进行Meta分析。结果:最终筛选出19篇文献,共纳入1329例病例。Meta分析结果示偏颇体质人群头面部异常区域平均温度具有明显改变,差异有统计学意义[SMD=0.36,95%CI(0.19,0.53),P<0.0001]。偏颇体质人群中焦部异常区域平均温度具有明显改变,差异有统计学意义[SMD=-0.75,95%CI(-0.79,-0.71),P<0.000 01]。偏颇体质人群督脉部异常区域平均温度具有明显改变,差异有统计学意义[SMD=0.68,95%CI(0.59,0.77),P<0.000 01]。结论:现有证据表明红外热成像技术被逐步应用于体质研究中,其在偏颇质者的体表温度特点、疗效评价等方面已取得一定的进展,可以作为偏颇体质评价的工具,它的评价方式、评价效果与体质量表相比同样突出。但是要进一步应用于临床、指导医疗实践还有待进一步扩大样本的试验研究。
