A semi-length focal plane detecting system for heavy ions has been built onthe Beijing Q3D magnetic spectrometer and tested by <sup>12</sup>C+<sup>197</sup>Au,<sup>16</sup>O+<sup...A semi-length focal plane detecting system for heavy ions has been built onthe Beijing Q3D magnetic spectrometer and tested by <sup>12</sup>C+<sup>197</sup>Au,<sup>16</sup>O+<sup>150</sup>Sm,and <sup>18</sup>O-<sup>156</sup>Gd reactions.The intrinsic resolutions of position and angle were 1.1 mmand 0.8°,respectively.The resolutions of energy loss ΔE,residual energy E<sub>R</sub> and totalenergy E<sub>T</sub> obtained were 3.0%,1.4% and 0.9%.respectively,after a special method ofdata processing was adopted.The achievable mass resolution is estimated to be about1.0% after necessary corrections for some signals concerned.Discussion aboul the edgeeffect of the detectors of this type is given too.展开更多
The microstructures and the tensile mechanical properties in the rolling plane of 1545 aluminum alloy sheet at different orientations with respect to the rolling direction were studied by means of tensile test, X-ray ...The microstructures and the tensile mechanical properties in the rolling plane of 1545 aluminum alloy sheet at different orientations with respect to the rolling direction were studied by means of tensile test, X-ray diffractometer(XRD), optical microscope and transmission electron microscope. The in-plane anisotropy of tensile mechanical properties was calculated and the inverse pole figures of the rolling plane, transversal section and longitudinal section were obtained by Harris method. The results show that the 1545 Al alloy sheet has remarkable in-plane anisotropy of mechanical properties and the main texture component is {110}〈112〉 texture. On the basis of the model that regards the sheet containing only {110}〈112〉 texture as a monocrystal, the relationship of in-plane anisotropy and the anisotropy of crystallography was analyzed. The study shows that it is the combined effects of the anisotropy of crystallography and microstructures that cause the in-plane anisotropy of mechanical properties, but the main cause is the crystallographic texture.展开更多
This paper discusses the humanity in plane,and puts forward problems such as dimension,ritualization,time and space through analysis of will,metaphor of plane,human body,activities and existence.Besides,this paper lis...This paper discusses the humanity in plane,and puts forward problems such as dimension,ritualization,time and space through analysis of will,metaphor of plane,human body,activities and existence.Besides,this paper lists examples such as the Japanese paintings,Karesansui,apparel and accessories,the architecture in ancient Egypt,the gothic church of the Middle Ages and the artistic works of the Renaissance,the Modernism and Post-modernism and further explores the main line of human beings in the developmental process of the forms of plane,revealing the significance of form.展开更多
By using lattice paths in the three-dimensional space we obtain bijectively an interpretation for the overpartitions of a positive integer n in terms of a set of plane partitions of n . We also exhibit two bijections ...By using lattice paths in the three-dimensional space we obtain bijectively an interpretation for the overpartitions of a positive integer n in terms of a set of plane partitions of n . We also exhibit two bijections between unrestricted partitions of n and different subsets of plane partitions of n .展开更多
文摘A semi-length focal plane detecting system for heavy ions has been built onthe Beijing Q3D magnetic spectrometer and tested by <sup>12</sup>C+<sup>197</sup>Au,<sup>16</sup>O+<sup>150</sup>Sm,and <sup>18</sup>O-<sup>156</sup>Gd reactions.The intrinsic resolutions of position and angle were 1.1 mmand 0.8°,respectively.The resolutions of energy loss ΔE,residual energy E<sub>R</sub> and totalenergy E<sub>T</sub> obtained were 3.0%,1.4% and 0.9%.respectively,after a special method ofdata processing was adopted.The achievable mass resolution is estimated to be about1.0% after necessary corrections for some signals concerned.Discussion aboul the edgeeffect of the detectors of this type is given too.
基金Project (G19999064911) supported by the National Key Fundamental Research Development Program of China
文摘The microstructures and the tensile mechanical properties in the rolling plane of 1545 aluminum alloy sheet at different orientations with respect to the rolling direction were studied by means of tensile test, X-ray diffractometer(XRD), optical microscope and transmission electron microscope. The in-plane anisotropy of tensile mechanical properties was calculated and the inverse pole figures of the rolling plane, transversal section and longitudinal section were obtained by Harris method. The results show that the 1545 Al alloy sheet has remarkable in-plane anisotropy of mechanical properties and the main texture component is {110}〈112〉 texture. On the basis of the model that regards the sheet containing only {110}〈112〉 texture as a monocrystal, the relationship of in-plane anisotropy and the anisotropy of crystallography was analyzed. The study shows that it is the combined effects of the anisotropy of crystallography and microstructures that cause the in-plane anisotropy of mechanical properties, but the main cause is the crystallographic texture.
文摘This paper discusses the humanity in plane,and puts forward problems such as dimension,ritualization,time and space through analysis of will,metaphor of plane,human body,activities and existence.Besides,this paper lists examples such as the Japanese paintings,Karesansui,apparel and accessories,the architecture in ancient Egypt,the gothic church of the Middle Ages and the artistic works of the Renaissance,the Modernism and Post-modernism and further explores the main line of human beings in the developmental process of the forms of plane,revealing the significance of form.
文摘By using lattice paths in the three-dimensional space we obtain bijectively an interpretation for the overpartitions of a positive integer n in terms of a set of plane partitions of n . We also exhibit two bijections between unrestricted partitions of n and different subsets of plane partitions of n .
