在《大学英语教程》(胡文仲等编著,外语教学与研究出版社、第一册、P243)中出现了这样一个句子: (1)Finally,in 1823,an event took place that gave New York city ,once and for all,its leading position. 句(1)中的that—分句,究...在《大学英语教程》(胡文仲等编著,外语教学与研究出版社、第一册、P243)中出现了这样一个句子: (1)Finally,in 1823,an event took place that gave New York city ,once and for all,its leading position. 句(1)中的that—分句,究竟是关系从句作定语,还是同位语从句,存在着两种看法: 一种认为这是一个由that引导的关系分句,作宠语,修饰(或限定)名词event; 另一种看法认为这是一个由that连接的同位语从句,与名词event同位,是对该名词的补充说明。 对于以上两种看法,我们认为第—种解释更为妥贴一些。如果我们仔细划分一下句子的成份,就不难发现,句中的that—分句,应该是关系势句作定语。它在句中的作用,不是用来对名词event进行补充说明的,而是用来限定该名词。展开更多
The self-absorption of γ-ray emitted from cylindrical fissile materials, such as 235 U and 239 Pu, does not possess spherical symmetry. The analytical formulae of self-absorption for γ-ray throughout the cylinder ha...The self-absorption of γ-ray emitted from cylindrical fissile materials, such as 235 U and 239 Pu, does not possess spherical symmetry. The analytical formulae of self-absorption for γ-ray throughout the cylinder have been obtained. The intensity of γ-ray is a function of γ-ray outgoing directions and cylindrical configurations, accordingly one can acquire the information about geometrical configuration of cylindrical fissile materials through multi-location measurements. Further more, the method is given in this article. The result can be applied to the fissile material safe- guard, such as nuclear monitoring and verifying.展开更多
The Longquanzhan gold deposit hosted in granitic cataclasites with mylontization of the foot wall of the main Yishui-Tangtou fault. 3He/4He ratios in fluid inclusions range from 0. 14 to 0. 24 R/Ra,close to those of t...The Longquanzhan gold deposit hosted in granitic cataclasites with mylontization of the foot wall of the main Yishui-Tangtou fault. 3He/4He ratios in fluid inclusions range from 0. 14 to 0. 24 R/Ra,close to those of the crust-source helium. 40Ar/36Ar ratios were measured to be 289-1811, slightly higher than those of atmospheric argon. The results of analysis of helium and argon isotopes suggested that ore-forming fluids were derived chiefly from the crust. The δ18O values of fluid inclusions from vein quartz range from -1.78‰ to 4.07‰, and the δD values of the fluid inclusions vary between -74‰ and -77‰. The hydrogen and oxygen isotope data indicated that the ore-forming fluid for the Longquanzhan gold deposit had mixed with meteoric water in the process of mineralization. This is consistent with the conclusion from the helium and argon isotope data.展开更多
文摘在《大学英语教程》(胡文仲等编著,外语教学与研究出版社、第一册、P243)中出现了这样一个句子: (1)Finally,in 1823,an event took place that gave New York city ,once and for all,its leading position. 句(1)中的that—分句,究竟是关系从句作定语,还是同位语从句,存在着两种看法: 一种认为这是一个由that引导的关系分句,作宠语,修饰(或限定)名词event; 另一种看法认为这是一个由that连接的同位语从句,与名词event同位,是对该名词的补充说明。 对于以上两种看法,我们认为第—种解释更为妥贴一些。如果我们仔细划分一下句子的成份,就不难发现,句中的that—分句,应该是关系势句作定语。它在句中的作用,不是用来对名词event进行补充说明的,而是用来限定该名词。
文摘The self-absorption of γ-ray emitted from cylindrical fissile materials, such as 235 U and 239 Pu, does not possess spherical symmetry. The analytical formulae of self-absorption for γ-ray throughout the cylinder have been obtained. The intensity of γ-ray is a function of γ-ray outgoing directions and cylindrical configurations, accordingly one can acquire the information about geometrical configuration of cylindrical fissile materials through multi-location measurements. Further more, the method is given in this article. The result can be applied to the fissile material safe- guard, such as nuclear monitoring and verifying.
基金This research is jointly granted by the National Natural Science Foundation of China （Grant No. 40272088）.
文摘The Longquanzhan gold deposit hosted in granitic cataclasites with mylontization of the foot wall of the main Yishui-Tangtou fault. 3He/4He ratios in fluid inclusions range from 0. 14 to 0. 24 R/Ra,close to those of the crust-source helium. 40Ar/36Ar ratios were measured to be 289-1811, slightly higher than those of atmospheric argon. The results of analysis of helium and argon isotopes suggested that ore-forming fluids were derived chiefly from the crust. The δ18O values of fluid inclusions from vein quartz range from -1.78‰ to 4.07‰, and the δD values of the fluid inclusions vary between -74‰ and -77‰. The hydrogen and oxygen isotope data indicated that the ore-forming fluid for the Longquanzhan gold deposit had mixed with meteoric water in the process of mineralization. This is consistent with the conclusion from the helium and argon isotope data.
