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NaI(Tl)对6.13MeV-γ射线的长管体源的探测效率的测量 被引量:3
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作者 石宗仁 徐鹍 +3 位作者 丁声耀 王顺庆 郭智荣 左亮周 《高能物理与核物理》 EI CSCD 北大核心 2005年第2期124-129,共6页
导出了核动力反应堆一回路16N的泄漏率与γ射线探测器的计数率、高压蒸气流速、16N的衰变常量及其发射γ射线的概率和效率的关系式,并得出效率与高压蒸气流速和16N的衰变常量等无关的结论.用发射6.13MeV-γ射线的PuC点源测量了NaI(Tl)... 导出了核动力反应堆一回路16N的泄漏率与γ射线探测器的计数率、高压蒸气流速、16N的衰变常量及其发射γ射线的概率和效率的关系式,并得出效率与高压蒸气流速和16N的衰变常量等无关的结论.用发射6.13MeV-γ射线的PuC点源测量了NaI(Tl)探测器对长管体源的相对效率的空间分布和参考点的绝对效率,据此计算出长管体源的效率,效率的测量值与MC法的计算值在7%之内符合.分析了6.13和7.12MeVγ射线的效率差异对16N泄漏率和Compton小角散射的次级γ射线对收敛长度的影响. 展开更多
关键词 核动力反应堆 ^16N 泄漏率 6.13MeV-γ射线 长管体源 NaI探测器
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Effect of total resource allocation effect and economic growth:Chinese experience of 1978-2004 被引量:1
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作者 Yang Minghong Yang Hanbin Sun Jiqiong 《Ecological Economy》 2007年第4期373-380,共8页
The analytical method of total resource reallocation effect is an evolution of the analytical method of the factors of economic growth. Since the marketization reform in China in 1978, market mechanism has played a mo... The analytical method of total resource reallocation effect is an evolution of the analytical method of the factors of economic growth. Since the marketization reform in China in 1978, market mechanism has played a more and more important role in resource allocation, and Chinese economy has developed greatly, which is called "the Chinese Miracle". This paper analyzes the economic growth in China from 1978 to 2004 with the analytical method of total resource reallocation effect. The result shows that the annual growth rate of total resource reallocation effect was 0.2%, which was 5.1% of the comprehensive productivity and 0.21% of the gross output growth, i.e. the total resource allocation played a weak role in the economic growth in China. When analyzing it in Chenery's multinational model, we find that Chinese comprehensive productivity growth rate was higher than that in all the income phases of the model, but the total resource allocation effect was obviously lower than that in all the income phases of the model. It indicates that the total resource allocation in China has a great potential, and that to accelerate marketization reform is one of the important issues for Chinese economic development. 展开更多
关键词 China Economic growth Total resource allocation effect
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Expression levels of CXCR4 and VEGF correlate with blood-borne metastatic progression and outcome in patients with osteosarcoma 被引量:1
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作者 Feng Lin Shuier Zheng Zan Shen Lina Tang Ping Chen Yuanjue Sun Hui Zhao Yang Yao 《The Chinese-German Journal of Clinical Oncology》 CAS 2009年第5期292-295,共4页
Objective:We determine whether chemokine receptor CXCR4 and vascular endothelial growth factor(VEGF) expression related to the metastasis and survival outcome of patients with osteosarcoma.Methods:Tissue microarray(TM... Objective:We determine whether chemokine receptor CXCR4 and vascular endothelial growth factor(VEGF) expression related to the metastasis and survival outcome of patients with osteosarcoma.Methods:Tissue microarray(TMA) was used to detect the expression of CXCR4 and VEGF in 56 osteosarcoma patient samples.Two-year follow-up was performed to observe the metastatic behavior and overall survival of osteosarcoma patients.Results:There was a significant correlation between the expression levels of CXCR4 and VEGF in 56 osteosarcoma patient samples(P = 0.002).Univariate analysis revealed the expression of CXCR4 and VEGF was not associated with age, gender and the level of ALP but associated with clinical stage.Conclusion:These data raises the possibility that VEGF could regulate the levels of CXCR4 to promote the migration of tumor cells to target organs.CXCR4 and VEGF expression are highly correlated with metastatic progression in patients with osteosarcoma and their immunohistochemical expression have predictive value for the metastatic development. 展开更多
关键词 OSTEOSARCOMA CXCR4 VEGF blood metastasis
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