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干姜热性作用的大鼠血清代谢组学研究 被引量:4
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作者 刘林生 缪丽燕 《中成药》 CAS CSCD 北大核心 2017年第7期1491-1494,共4页
目的基于气相质谱联用代谢组学平台研究干姜水提液对大鼠血清的影响,探索干姜热性作用机制。方法雄性大鼠连续5 d给予干姜水提液,分析大鼠血清中小分子代谢物的变化。运用主成分分析等多元线性统计技术分析差异代谢产物,解析内源性代谢... 目的基于气相质谱联用代谢组学平台研究干姜水提液对大鼠血清的影响,探索干姜热性作用机制。方法雄性大鼠连续5 d给予干姜水提液,分析大鼠血清中小分子代谢物的变化。运用主成分分析等多元线性统计技术分析差异代谢产物,解析内源性代谢产物变化及相关通路。结果正常大鼠在给药后,α-酮戊二酸、苹果酸及柠檬酸等三羧酸循环中间产物下降,天冬氨酸、谷氨酸及胱氨酸等生糖氨基酸中间产物也下降,推测大鼠在给予干姜提取物后体内三羧酸循环代谢通路及生糖氨基酸通路激活用于产生热量,与干姜热性功效相吻合。结论正常大鼠中干姜提取液可能通过增强三羧酸循环及生糖氨基酸代谢通路发挥了热性的功效。 展开更多
关键词 干姜 热性功效 能量代谢 代谢组学
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Characteristic analysis of bleeding effect on standing column well (SCW) type geothermal heat exchanger
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作者 CHOI Hoon-ki YOO Geun-jong +2 位作者 LIM Kyung-bin LEE Sang-hoon LEE Chang-hee 《Journal of Central South University》 SCIE EI CAS 2012年第11期3202-3207,共6页
Thermal performance is the most important factor in the development of a borehole heat exchanger utilizing geothermal energy.The thermal performance is affected by many different design parameters and different operat... Thermal performance is the most important factor in the development of a borehole heat exchanger utilizing geothermal energy.The thermal performance is affected by many different design parameters and different operating conditions such as bleeding.This eventually determines the operation and cost efficiency of the borehole heat exchanger system.The thermal performance of an open standing column well (SCW) type geothermal heat exchanger was assessed under the influence of bleeding.For this,a thermal response test rig was established with line-source theory.The test rig also had a bleeding function by releasing fluid while taking additional underground water through the heat exchanger.The thermal response test was performed with an additional constant input heat source.Effective thermal conductivity and thermal resistance were obtained from the measured data.From the measurement,the effective thermal conductivity is found to have 1.47 times higher value when bleeding is applied.The thermal resistance also increases by 1.58 times compared to a non-bleeding case.This trend indicates enhanced heat transfer in the SCW type heat exchanger with a bleeding function.Bleeding,therefore,could be an effective method of achieving a high heat transfer rate in the SCW type heat exchanger with sufficient underground water supply. 展开更多
关键词 standing column well type thermal response test effective thermal conductivity thermal resistance bleeding effect
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The equivalent and aliovalent dopants boosting the thermoelectric properties of YbMg2Sb2 被引量:3
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作者 Xinxin Yang Yayun Gu +3 位作者 Yuping Li Kai Guo Jiye Zhang Jing-Tai Zhao 《Science China Materials》 SCIE EI CSCD 2020年第3期437-443,共7页
Antimony-based Zintl compounds AM2Sb2(A=Ca,Sr,Ba,Yb,Eu;M=Mg,Zn,Cd,Mn),which enable a broad range of manipulation on electrical and thermal transport properties,are considered as an important class of thermoelectric ma... Antimony-based Zintl compounds AM2Sb2(A=Ca,Sr,Ba,Yb,Eu;M=Mg,Zn,Cd,Mn),which enable a broad range of manipulation on electrical and thermal transport properties,are considered as an important class of thermoelectric materials.Phonon and carrier transport engineering were realized in YbMg2Sb2 via equivalent and aliovalent substitution of Zn and Ag,respectively.The roomtemperature thermal conductivity reduces from 1.96 to 1.15 W m^-1 K^-1 for YbMg2-xZnxSb2 due to the mass and strain fluctuation through the formation of the absolute solid solution of YbMg2Sb2-YbZn2Sb2.Furthermore,the carrier concentration has been further optimized by Ag doping(from 0.42×10^19 to 7.72×10^19 cm^-3 at room temperature),and thus the electrical conductivity and the power factor are enhanced effectively.The integrated aspects make the dimensionless figure of merit(zT)reach 0.48 at 703 K,which is 60%higher than the pristine YbMgZnSb2 sample. 展开更多
关键词 Zintl phase YbMg2Sb2 solid solution thermal conductivity thermoelectric properties
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