搜索结果: 1-15 共查到“知识库 理学 U and Th”相关记录65条 . 查询时间(0.171 秒)
上海市免疫学研究所李斌课题组及合作团队揭示没食子酸诱导Th-1-like Treg细胞分化并增强抗肿瘤免疫的新机制（图）
调节性T细胞 上海市免疫学研究所 枯草芽孢杆菌 植物乳酸杆菌
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2023/4/12
调节性T细胞（Treg）是一类调控体内免疫平衡的T细胞亚群，其特征为高表达转录因子FOXP3。Treg细胞数量或功能异常直接影响疾病的发生发展，如自身免疫病、代谢性疾病和癌症。结直肠肿瘤中Treg至少存在两种亚群即FOXP3high Treg和FOXP3low Treg，且亚群的比例与患者预后相关。已有研究结果表明，结直肠肿瘤浸润Treg细胞高表达免疫检查点蛋白如PD-L1、PD-L2和TIGIT...
杨明等-GGR: 褐帘石激光原位U-Th-Pb定年和Sm-Nd同位素分析（图）
褐帘石 激光原位 U-Th-Pb定年 Sm-Nd同位素分析
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2023/1/16
褐帘石隶属于绿帘石族矿物，是一种常见的副矿物，广泛存在于火成岩、变质岩和热液成矿体系中。由于褐帘石大量富集LREE、Sr、Th与U等微量元素，使得褐帘石U-Th-Pb定年与Sm-Nd同位素分析成为可能。因此，褐帘石在研究岩浆过程、变质作用、俯冲带物质循环及热液矿床成矿过程等方面具有重大意义及广阔应用前景。
COVID-19患者淋巴细胞数及Th / Tc值预测病情进展研究
新型冠状病毒 新型冠状病毒肺炎 跨血淋巴细胞数 Th与Tc比值
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2021/3/1
探讨新型冠状病毒肺炎（COVID-19）患者病情进展与周围血淋巴细胞数（TLC），CD4 + T（Th）与CD8 + T（Tc）比值变化情况，以及TLC和Th / Tc值作为新冠肺炎病情进展监测指标的可行性。方法收集2020年1月28日- 2月10日某院确诊的12例COVID-19患者的实验室检测资料，根据临床症状分为重型/危重型组，轻型/普通型组样本，采用流式细胞仪检测患者的血浆TLC，比较不同...
磷灰石单颗粒(U-Th)/He测年实验流程的建立及验证
(U-Th)/He定年 激光熔融法 同位素稀释剂法 Durango磷灰石
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2018/5/14
（U-Th）/He同位素定年是近几十年快速发展起来的1种能够对岩石低温冷却历史进行有效研究的新型放射性同位素定年方法。由于磷灰石的He封闭温度较低，所以它能反映低温阶段（40～80℃）的热历史信息，在低温热年代学领域具有很好的应用前景。但是，由于磷灰石（U-Th）/He测年的影响因素多且测试流程复杂，目前国内对于（U-Th）/He同位素定年方法和流程的研究还处于起步阶段。依托中国地震局地质研究所新...
湘中龙山大型金锑矿床成矿时代研究——黄铁矿Re-Os和锆石U-Th/He定年
龙山金锑矿床 黄铁矿Re-Os同位素定年 锆石U-Th/He同位素定年 成矿时代
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2016/11/18
龙山金锑矿床是湘中锑-金矿集区最重要的矿床之一，因缺少适合传统放射性同位素定年的矿物，其成矿时代以往未得到很好的限定，制约了对矿床成因的认识。由于分析测试技术的进步，Re-Os同位素定年技术得到了发展，可对热液矿床中形成的低Re、Os含量的硫化物进行较准确可靠的年龄测定，从而可为低温热液矿床的形成时代提供有效制约。锆石U-Th/He同位素定年，也是近年发展和成熟起来的定年技术，对低温热事件极其敏感...
国际标样Durango磷灰石(U-Th)/He年龄测定
Durango磷灰石 国际标样 (U-Th)/He定年
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2016/7/28
人们认识到可以用放射性成因4He对矿物进行定年已经有一百年的历史,但是利用富含U、Th的矿物进行(U-Th)/He定年是近三十年来快速发展的一种低温(热)年代学方法。由于U-Th-He同位素体系的封闭温度低(磷灰石4He的封闭温度为~75℃),该方法极大的拓展了中低温热年代学研究(如40Ar/39Ar,裂变径迹等)的温度范围下限,已经被广泛应用于浅表地质过程的研究中。Durango磷灰石是国际上广...
新疆东天山红云滩地区构造-热演化探讨:来自Ar-Ar和(U-Th)/He热年代学的约束
热演化历史 红云滩岩体 东天山
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2015/12/30
红云滩岩体位于东天山觉罗塔格西部，对其进行热演化历史研究对于揭示觉罗塔格地区乃至整个东天山地区的
构造热演化历史具有重要意义。本文对红云滩岩体进行黑云母 ＡｒＡｒ、锆石（ＵＴｈ）／Ｈｅ和磷灰石（ＵＴｈ）／Ｈｅ测年，并结合前
人的锆石 ＵＰｂ测年结果，精细刻画出该岩体自形成以后经历的热演化过程，并据此识别出东天山红云滩地区发生过多期快
速抬升冷却事件。黑云母阶段升温 ＡｒＡｒ法同位...
Endogenous Technological Change In Th DICE Integrated Assessment Model
Endogenous Technological Change DICE Integrated Assessment Model
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2014/10/22
Integrated Assessment Models (IAM)s play a key role in climate policy research; however, many IAMs are limited by their treatment of technological change. This is a particularly vexing limitation beca...
Th Effcts of Sea Level Change on the Molecular and Isotopic Composition of Sediments in the Cretaceous Western Interior Seaway: Oceanic Anoxic Event 3, Mesa Verde, CO, USA
Sea Level Change on the Molecular Isotopic Composition Sediments Cretaceous Western Interior Seaway Oceanic Anoxic Event 3 Mesa Verde CO USA
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2014/10/22
Cretaceous Oceanic Anoxic Events (OAEs) represent periods of enhanced burial of organic matter in black shale in marine, continental margin, and epicontinental settings around the globe. Compared to o...
Evolution Of Volatile Content Of Th Parent Magma Of Th 1875 Eruption Of Askja Volcano, Iceland
Evolution Of Volatile Content Parent Magma The 1875 Eruption Askja Volcano, Iceland
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2014/10/21
The Askja central volcano is located in the northeastern rift zone in central Iceland. The bulk of the eruption of Askja on March 28-29 1875 consisted of a plinian eruption that lasted 6-7 hours, prod...
An Integrated Study of the South-Central Part of the Springerville Volcanic Field; Th Final Piece
South-Central Part Springerville Volcanic Field The Final Piece
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2014/10/21
An Integrated Study of the South-Central Part of the Springerville Volcanic Field; Th Final Piece.
Th Sedimentological and Geomorphological Response of a Glacially Conditioned Watershed to Event Induced Flooding: Insights from the Connecticut River and Hurricane Irene
Sedimentological Geomorphological Response a Glacially Conditioned Watershed Event Induced Flooding Connecticut River Hurricane Irene
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2014/10/21
Tropical Storm Irene’s most extreme rainfall resulted in record-breaking sediment loads from upland tributaries to the Connecticut River. However, was the event exceptional with respect to resultant d...
Th Effcts of Sea Level Change on the Molecular and Isotopic Composition of Sediments in the Cretaceous Western Interior Seaway: Oceanic Anoxic Event 3, Mesa Verde, CO, USA
Isotopic Composition Sediments the Cretaceous Western Interior Seaway Oceanic Anoxic Event 3 Mesa Verde CO USA
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2014/10/20
Cretaceous Oceanic Anoxic Events (OAEs) represent periods of enhanced burial of organic matter in black shale in marine, continental margin, and epicontinental settings around the globe. Compared to o...
Th Wild Sky Wilderness Proposal: Politics, Process, and Participation in Wilderness Designation
Wilderness Washington State National Forests Local Participation Political Ecology Conservation
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2014/10/20
Wild Sky, a proposed wilderness in Washington State, has been a source of local contention since its inception. Drawing on the theories of political ecology, international conservation, and actor-base...
ON UNIQUENESS OF SOLUTION OF A n-TH ORDER DIFFERENTIAL EQUATION IN CONFORMAL GEOMETRY
ON UNIQUENESS OF SOLUTION A n-TH ORDER DIFFERENTIAL EQUATION CONFORMAL GEOMETRY
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2014/4/3
In this paper, we prove an uniqueness theorem for a n-th order elliptic equation on the standard n-sphere Sn. The problem arises naturally from the point of view of conformal geometry. The method we u...