排序方式: 共有94条查询结果,搜索用时 15 毫秒
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以氨水和硝酸锌为前躯体,采用低温水溶液法在涂敷ZnO晶种层的玻璃衬底上外延生长了ZnO纳米棒晶阵列。应用SEM、TEM、SAED和XRD表征了ZnO纳米晶的形貌和结构。讨论了该组成体系水溶液法纳米棒外延生长的机理及其对棒晶形貌的影响。通过对水溶液pH值的原位二次调整,制备出了ZnO纳米管和表面绒毛状的棒晶阵列,基于生长机理探讨了它们的形成原因,为实现不同形貌ZnO纳米晶阵列的优化控制提供了可能的技术途径。结果表明,不同形貌的ZnO均属沿c轴择优取向的六方纤锌矿结构。 相似文献
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CsI(Tl)晶体探测器APD读出的温度效应 总被引:1,自引:0,他引:1
对中国科学院近代物理研究所自行生长的铊激活碘化铯闪烁晶体CsI(Tl)光输出及Hamamtsu公司生产的S8664-1010型雪崩光二极管(APD)增益对温度的依赖关系做了系统研究. 结果表明, CsI(Tl)晶体光产额在室温范围内随着温度的增加而增加, 在-2℃—8℃温度范围内的平均温度系数为0.67%/℃, 在8℃—25℃温度范围内的平均温度系数为0.33%/℃. 而对所使用的APD, 其增益在室温范围内的温度系数为-3.68%℃(工作电压400V). APD结合CsI(Tl)晶体在室温下对137Cs的662keV γ射线的能量分辨可达5.1%. 相似文献
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空气动力学方程组的固壁边界问题是谷超豪指出的空气动力学方程组的两类特征边界问题之一.陈恕行,Ebin都研究过这个问题,取得了一定的结果。 本文利用该方程组本身的特殊结构,使解在边界处的法向微商直接被切向微商所控制,改进了文献[3,4]的结果,证明了局部的连续可微解的存在和唯一性定理, 相似文献
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LIU Da LU Chen-Ghi DUAN Li-Min YANG He-Run LU Yan-Xia HU Rong-Jiang LI Zu-Yu ZHANG Jin-Xia HU Zheng-Guo SUN You-Mei XU Zhi-Guo MA Peng GENG Peng TANG Shu-Weu WANG Wen-Xin ZHOU Jian-Rong 《中国物理C(英文版)》2010,34(4)
A novel Micro-pattern gaseous detector (MPGD), thick GEM with electrodes made of a resistive material (RETGEM) is presented. In this paper we mainly investigate the energy resolution of a RETGEM in Ar+CO_2 with different gas mixtures. The results indicate that an energy resolution 30% in single and double mode can be obtained. The existence of an optimum energy resolution is discussed. 相似文献
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甘油基电解液中阴离子对阳极氧化TiO2纳米管生长的影响 总被引:3,自引:0,他引:3
在NH4F-甘油-水电解液中,采用阳极氧化法,在纯Ti基底上制备了高度取向的TiO2纳米管阵列,考察了阴离子种类、阳极氧化时间及NaAc浓度对纳米管阵列生长的影响.结果表明,TiO2纳米管的生长速率和长度强烈依赖于阴离子的种类和浓度.NaNO3和NaCl的加入能增大阳极氧化时的电流密度,提高TiO2纳米管底部的腐蚀速率,提高管的生长速率及增加管的长度;而NaAc的加入更大程度上抑制了已生成的TiO2纳米管顶部的溶解,提高了纳米管的净生长速率,得到较长的纳米管阵列. 相似文献
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Lin ZG Wang B Cao J Chen BK Gao YZ Chi YN Xu C Huang XQ Han RD Su SY Hu CW 《Inorganic chemistry》2012,51(8):4435-4437
Seven polyoxopalladate compounds, [Pd(15)(SeO(3))(10)(μ(3)-O)(10)](10-), with Na(+) (1) and K(+) (2) as counterions, and Na(6)[M(II){Pd(12)(SeO(3))(8)(μ(4)-O)(8)}]·nH(2)O (M = Co (3), Zn (4), Ni (5), Cu (6), Mn (7); n = 7-9), have been prepared and characterized by SXRD, FT-IR, UV-vis, EA, TGA, and ESI-MS. These compounds comprise two distinct cluster configurations, {Pd(15)} and {M(II)Pd(12)}, which reveals the possibility of obtaining desired noble metal clusters with a certain nuclearity by using different cations as potential structural directing or template agents in synthesis. All compounds showed apparent absorptions in the visible light region, while 3 and 7 were found to show paramagnetic behavior typical of mononuclear Co(II) and Mn(II) complexes with zero-field splitting. 相似文献
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Exotic Behavior of Elastic Scattering Differential Cross-Sections of Weakly Bound Nucleus 17F at Small Angles
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HAN Jian-Long WANG Qi XIAO Zhi-Gang XU Hu-Shan SUN Zhi-Yu HU Zheng-Guo ZHANG Xue-Yin WANG Hong-Wei MAO Rui-Shi YUAN Xiao-Hua XU Zhi-Guo ZHAO Tie-Cheng 《中国物理C(英文版)》2006,30(11):1058-1061
The differential cross-sections for elastic scattering of 17F and 17O on 208Pb have been measured at Radioactive Ion Beam Line at Lanzhou (RIBLL). The variation of the logarithms of differential cross-sections with the square of scattering angles shows clearly that there exists a turning point in the range of small scattering angles (6°—20°) for 17F having exotic structure, while no turning point was observed in the 17O elastic scattering. The experimental results have been compared with previous data. Systematical analysis on the available data seems to conclude that there is an exotic behavior of elastic scattering differential cross-sections of weakly bound nuclei with halo or skin structure as compared with that of the ordinary nuclei near stable line. Therefore the fact that the turning point of the logarithms of differential cross-sections appears at small angle for weakly bound nuclei could be used as a new probe to investigate the halo and skin phenomenon. 相似文献
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