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介绍了90年代以来Pb-Sr-Nd同位素石油地球化学中的最新应用情况由于它们在石油物源的判别及年龄测定方面的优势,正赵引起各国科学家及产业部门的高度重视。 张景廉,朱炳泉 - 《地球科学进展》 被引量: 29发表: 1997年 扬子陆块西北缘碧口块体印支期花岗岩类地球化学和Pb-Sr-Nd同位素组成:限制岩石成因及其动力学背景...
37Rb 38Sr 39Y 40Zr 41Nb 42Mo 43Tc 44Ru 45Rh 46Pd 47Ag 48Cd 49In 50Sn 51Sb 52Te 53I 54Xe 55Cs 56Ba 57-71La-Lu 72Hf 73Ta 74W 75Re 76Os 77Ir 78Pt 79Au 80Hg 81Tl 82Pb 83Bi 84Po 85At 86Rn 87Fr 88Ra 89-103Ac-Lr 104Rf 105Db 106Sg 107Bh 108Hs 109Mt 1...
In the study of (Tl, Pb, Bi)-Sr-Ca-Cu-O systemm, a nitrate conversion method was developed to prepare (Tl, Pb, Bi)Sr Ca Cu O (1223 phase) with high yield in short reaction time. Also, the well mixing of precursors including Tl O could be achieved avoiding a two-stage reaction...
社会形态理论是唯物史观不可或缺的一部分,自20世际二三十年代社会形态理论传到中国开始,就曾经造成社会发展形态区分的讨论.近些年相关社会形态理论的研究中,"三形态说"和"五形态说"讲的争论更为引人注意.马克思将人类发展演变历史的发展历程划分成五种形态或是三种形态,及能不能以"三形态"说替代"五形态"论是争论的...
A 105K superconductor with three Cu O layers in the bismuth cuprate system : Bi 1.5Pb 0.5Ca 2.5Sr 1.5Cu 3O 10+ δThe n=3 member of the Bi 1.5Pb 0.5 (Ca, Sr) n+1Cu nO 2n+4+ δ system has been prepared and characterized by X-ray diffraction and electron microscopy. High-T c...
Balachandran, ``Minimum Critical-Current Density of 105 A/cm2 at 77 K in the Thin-Layer of Bi1.8Pb0.4Sr2.0- Ca2.2Cu3.0Oy Superconductor Near the Ag in Ag-Sheathed Tapes,'' Physica C, 242, 246-50 (1995).Minimum critical current density of 10 5 A/cm 2 at 77 K in the thin layer...