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排序方式: 共有72条查询结果,搜索用时 31 毫秒
1.
齐齐哈尔市园林绿化树种的选择和配置 总被引:3,自引:0,他引:3
本文运用大量的实例,从齐齐哈尔市园林绿化树种选择和应用的角度出发,分析了园林绿化中存在的问题,提出适地适树,在综合条件允许的情况下,扩大选择范围,改变传统配置模式,创造出更加优美的城市环境。 相似文献
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Xu Yanbing Yang Weifan Yuan Shuanggui Xiao Yonghou Pan Qiangyan Li Yingjun 《Journal of Radioanalytical and Nuclear Chemistry》2002,251(2):341-343
Barium isotopes were produced by 60 MeV/u 18O ion bombardment of natural uranium via 238U (18O, X) reactions. Ba sources were prepared by radiochemical separation, and measured by a HPGe detector. The cumulative cross sections were obtained by analysis of measured time sequence g-ray spectra. A double peak phenomenon in Ba isotope distribution was observed. 相似文献
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XU Shuwei PAN Qiangyan ZHANG Tianmei YUAN Shuanggui ZHANG Xueqian SHI Shuanghui TIAN Jiaqi HUANG Wenda 《中国物理C(英文版)》1993,17(11):985-987
Activities of 183Os were produced by 39MeV α particles bombarding on a natural tungsten target.β+ spectrum with coincidence gate set on the strongest 382keV γ-rays of 183Os decay was measured.The endpoint energy of the β+ spectrum was determined and the QEC value of 183Os decay was extracted to be 2.24±0.10MeV which is in good agreement with the predicted value 2.30±0.10MeV on the basis of mass systematics. 相似文献
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Gan Zaiguo Guo Junsheng Shi LIjun Liu HOngye Qin Zhi Guo Tianrui Lei Ziangguo Ma Ruichang Huang Wenxue Yuan Shuanggui Zhang Xueqian Jin Genming 《中国物理C(英文版)》1998,22(8):673-677
131Pm nucleus was produced in the 106Cd (32S,3p4n) 131Pm reaction. Theproducts were transported by helium jet and tape system, and X,γ single spectra and X-γ,γ-γ coincidence spectra were measured. The half-life of 131Pm has beendetermined to be (6.3±0.8)s. A partial decay scheme of 131Pm is proposed. 相似文献
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用14MeV中子轰击天然锇靶,取道^192Os(n,α)反应生成^189W。利用改进的锇蒸馏装置蒸馏O8O4,完成锇与反应产物的分离;通过四苯砷铼沉淀除去铼。使用HPGe探测器测量了分离的钨样品的γ射线谱,该γ射线谱显示钨样品中杂质元素的去污是令人满意的。 相似文献
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The decomposibility of a non-abelian gauge potential is discussed from the point of view of the Cartan geometry with zero-torson. By means of the commutation relation between the γ-matriees and the generators of the Lorentz group, we obtain the expression of gauge potential for the related "isotopic space". 相似文献