排序方式: 共有36条查询结果,搜索用时 15 毫秒
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给出并证明了曲线的两个主要特征之间的关系,即曲线Г: = (t)的曲率k(t)和挠率τ(t)之间的关系式τ(t)=φ(t)k(t).作为公式τ(t)=φ(t)k(t)的应用给出了一条曲线成为特殊曲线的充要条件. 相似文献
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作者在文[1]中给出了半粘合拓扑空间以及半粘合映射的定义,并得到了它们的基本性质。中文进一步研究了与半枯合拓扑空间和半粘合映射有关的问题。另外也讨论了商空间成为S2-拓扑空间的条件.最后给出了一个半同胚定理。 相似文献
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A Module Test of CCDA: an Array to Select the Centrality of Collisions in Heavy Ion Collisions 下载免费PDF全文
A test result of a module for the collision centrality detector array (CCDA), a simple detector array for the event classification of the centrality, is presented. The CsI(Tl) module has PMTs on both ends to read out signals. The beam test results indicate that it provides a good light charged particles (LCP) identification and a reasonable energy resolution. The energy spectra of LCPs are compared with the GEANT simulation. 相似文献
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研究了对BC501A液体闪烁体对γ射线的光输出响应特性。实验上利用γ放射源(60Co,137Cs)测量了不同光电倍增管高压下,尺寸为Φ5.08 cm×5.08 cm的BC501A液体闪烁体探测器的脉冲幅度谱。利用Geant4软件进行模拟,计算结果与实验数据很好地符合,得到了能量分辨函数及能量刻度曲线。利用Geant4研究了BC501A的脉冲幅度谱的康普顿边缘Ec、康普顿峰Emax及康普顿半高点E1/2与能量分辨率的关系。同时模拟结果显示,随γ射线能量(0.2~3 Me V)的增加,康普顿边缘位置Nc/Nmax从0.8至0.7线性减少。 相似文献
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利用标准放射伽玛源(22Na,137Cs)测量了尺寸为Φ5.08 cm×2.54 cm的BC501A中子探测器的脉冲幅度谱,并利用MCNP软件进行了模拟,详细考虑了探测器的几何尺寸、材料、以及能量分辨函数,计算结果很好地再现了实验数据,精确地确定了康普顿边缘的位置,完成了BC501A中子探测器的能量刻度。并采用14.8 MeV的T(d,n)4He中子源对聚乙烯样品开展了中子学积分实验,结果表明,BC501 A中子探测器的能量刻度过程以及聚乙烯中子学积分实验数据的处理过程是完全合理并且可靠的。The pulse-height spectra of the BC501A scintillator (Φ5.08 cm×2.54 cm) were measured using 22Na, 137Cs γ-ray source, in which MCNP simulation was applied. The simulated pulse-height spectra show a good agreement with the measured data considering the geometry, material and energy resolution function of the scintillator. The position of the Compton edge has been precisely determined and an accurate energy calibration of BC501A scintillator was also achieved. An neutronics integral experiment of polythene with 14.8 MeV T(d, n)4He neutron source was carried out. The results indicate that the procedures of the energy calibration experiment of BC501A scintillator and the data analyzing in the polythene integral experiment are reasonable and reliable. 相似文献