搜索结果: 1-15 共查到“知识库 同位素技术”相关记录395条 . 查询时间(2.109 秒)
放射性衰变及辐射类别(图)
放射性衰变 辐射类别 同位素
2023/3/9
土壤侵蚀示踪的137Cs技术研究进展
137Cs 土壤侵蚀 背景值 侵蚀转化模型
2022/3/31
64Cu标记单链DNA及其体内分布的初步研究
单链DNA 64Cu标记 体内分布
2022/3/31
本文综合考虑微观组织不均匀性等材料的内在分散性,以及载荷历程、工作环境等外在分散性的影响,针对放射性同位素热源(RHU)产品结构特点,选用基于随机有限元法的应力-强度干涉模型,采用解析法与蒙特卡罗法相结合的方式,在有限的试验规模下,定量评价了某型RHU在再入过程中经历一系列环境载荷后的可靠性水平。 利用本文所述方法计算得到:该型RHU在95%置信度下的可靠度置信下限为0.999 989,达到了一般...
DETECTION OF THE NITRATE POLLUTION SOURCES IN SHALLOW AQUIFER, USING INTEGRATION OF RS&GIS WITH STABLE ISOTOPES TECHNOLOGIES
Mosaic image Nitrate Pollution Sources Anthropogenic Gogebic Shallow aquifer Stable isotopes
2018/5/15
Geographical information system (GIS) and remote sensing technique is a tool which is used for acquiring data from space, storing, analyzing and displaying spatial data, also can use for investigating...
铼 (Re)、锇 (Os)元素具有对氧化还原的敏感性和亲有机质特性,富集于烃源岩、油砂、原油、沥青等油气藏相关地质样品中,并被用于油气藏同位素定年。该方法既可通过Re-Os等时线直接获取油气成藏过程的绝对地质年龄,又可利用Os同位素初始值开展油源对比。分析近十余年来油气藏Re-Os同位素年代学研究的进展与不足,指出为推动该定年技术的发展及其在油气勘探实践中的应用,学术界和工业界应密切合作共同探索R...
锆石Hf和全岩Nd同位素填图研究进展:以三江特提斯造山带为例
Nd-Hf同位素填图 板块边界 金属矿床 三江特提斯造山带
2016/11/18
近年来,区域性的Nd-Hf同位素填图正成为探索岩石圈结构和演化,制约陆块边界位置和壳-幔相互作用以及它们与金属成矿作用耦合关系的重要研究方法。目前的研究主要集中于中国的拉萨地体以及澳大利亚太古宙尤冈克拉通,包括地体地壳性质与空间变化规律、成矿系统约束和区域找矿潜力等方面。本文以三江特提斯造山带为例,使用克里格插值法在MAPGIS平台完成同位素等值线图,基此解析三江地区岩石圈结构以及大规模成矿作用。...
The Standard Model in the Isotopic Foldy-Wouthuysen Representation without Higgs Bosons in the Fermion Sector. Spontaneous Breaking of Parity and "Dark Matter" Problems
The Standard Model Isotopic Foldy-Wouthuysen Higgs Boson
2011/8/2
Abstract: The Standard Model with massive fermions is formulated in the isotopic Foldy-Wouthuysen representation. SU(2)xU(1) - invariance of the theory in this representation is independent of whether...
The Isotopic Foldy-Wouthuysen Representation and Chiral Symmetry
Isotopic Foldy-Wouthuysen Chiral Symmetry General Physics
2011/8/2
Abstract: The paper introduces the isotopic Foldy-Wouthuysen representation. This representation was used to derive equations for massive interacting fermion fields. When the interaction Hamiltonian c...
Identification of the slow E3 transition 136mCs -> 136Cs with conversion electrons
E3 136mCs 136Cs conversion electrons
2011/7/21
We performed at ISOLDE the spectroscopy of the decay of the 8- isomer in 136Cs by and conversion-electron detection. For the first time the excitation energy of the isomer and the multipolarity of its...
The platinum nuclei: concealed configuration mixing and shape coexistence
platinum nuclei configuration mixing shape coexistence
2011/7/21
The role of configuration mixing in the Pt region is investigated. For this chain of isotopes, the nature of the ground state changes smoothly, being spherical around mass $A\sim 174$ and $A\sim 192$ ...
Distillation of hydrogen isotopes for polarized HD target
hydrogen isotopes polarized HD target
2011/7/21
We have developed a cryogenic distillation system to purify Hydrogen-Deuteride (HD) gas for a polarized HD target in LEPS experiments at SPring-8. A small amount of ortho-H$_2$ ($\sim$0.01%) in the HD...
Cross sections for proton-induced reactions on Pd isotopes at energies relevant for the gamma process
Cross sections proton-induced reactions Pd isotopes energies relevant
2011/7/21
Proton-activation reactions on natural and enriched palladium samples were investigated via the activation technique in the energy range of E_p=2.75 MeV to 9 MeV, close to the upper end of the respect...