排序方式: 共有103条查询结果,搜索用时 78 毫秒
81.
运用Nevanlinna值分布的理论和方法,研究了微分方程f(k)1Ak-1f(k-1)+…+A1f'+Af=0(k≥2)解的增长性,其中Aj(1≤j≤K-1),A为亚纯函数,假设A是以∞为亏值的超越亚纯函数,通过给定Aj(1≤j≤k-1)的不同条件,证明了齐次线性微分方程的任一非零解均为无穷级. 相似文献
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利用偏最小二乘法,按最大相关性提取出最强解释能力的信息,实现信息粒降维;通过欧氏距离聚类,获取不同层次的信息粒;根据需求选择合适的粒度进行分析.实验结果表明:文中所提方法是可行有效的. 相似文献
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阐述了配位滴定法测定汽油抗爆剂甲基环戊二烯三羰基锰(简称 MMT)的 Mn含量的原理,并对滴定条件进行了论证. MMT溶于氯仿中,然后加入溴溶液和HCl溶液进行处理以分解有机锰化合物,加热蒸去溶液中残留的溴,残渣以水胶状的酸分离出来.溶液的 pH 值可以通过 NH4Cl 和 NH3…H2O 进行调节.利用钙镁指示剂为指示剂,用 EDTA 溶液测定锰的含量,滴定终点颜色变化敏锐.该方法的 RSD 为0.11;~0.15;(n=3),平均回收率为99.56;~100.10;,方法准确、简便,可用于MMT中Mn含量的测定. 相似文献
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LI DeSheng~ CUI HengMin~ WANG ChengDong~ LING ShanShan~ HUANG Zhi~ & ZHANG HeMin* China Research Conservation Center for the Giant P a Ya’an China Medical College of Animal Sichuan Agricultural University Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education State Conservation Center for Gene Re- sources of Endangered Wildlife Hangzhou 《科学通报(英文版)》2011,56(24):2559-2564
Captive populations provide a precious genetic resource for endangered animals and a source of individuals for reintroduction to depleted habitats. Therefore, accuracy in determining paternity is of vital importance for managing captive populations and in selecting representative individuals of known genetic characteristics for release. In this study, we established a fast and effective method to conduct paternity testing for captive giant pandas in the Wolong population. This technique uses two highly poly... 相似文献
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TIE Yi HU Zheng Lü GuiXiang FU HanJiang XING RuiYun ZHU Jie SUN ZhiXian & ZHENG XiaoFei * Department of Biochemistry Molecular Biology Beijing Institute of Radiation Medicine Beijing China Department of Biochemistry Molecular Biology Basic Medical Science College Harbin Medical University Harbin China Received June accepted August 《科学通报(英文版)》2011,56(30):3172-3177
Ionizing radiation (IR) causes severe cellular damage both directly and indirectly and disrupts RNA integrity. RNA strand breaks are the most frequent type of damage caused by IR. RNA damage is involved in the development of degenerative diseases, including Alzheimer’s disease and Parkinson’s disease. However, the mechanism of mRNA damage and any resulting pathophysiological outcomes are poorly understood. This is partly because there is a lack of sensitive tools to monitor damage randomly occurring in RNA,... 相似文献
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介绍了在室温下设计合成的一种功能化离子液体1,2-二甲基-3-丁基咪唑硫酸氢盐离子液体[mmBim][HSO4]均为在不同温度下测定了该离子液体的密度、表面张力、粘度和电导率等性质,并根据特定的经验方程,估算了该离子液体的热膨胀系数、标准熵和晶格能等性质参数,为该离子液体的预期应用提供了重要的数据参考. 相似文献
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1 Biostratigraphicbackgroundandgeologi calsettingIneasternYunnan ,thesupra tointertidaldolomitesoftheXiaowaitoushanMember (Upper mostDengyingFormation =LatestSinian)areun conformablyoverlainbythesubsequent (earliestCambrian) phosphoritesoftheZhujiaqingFormation(MeishucunianStage) .TheoutcropsnearMeishucuninJinningCounty ,southwestofKunmingrepresentsakeysectionforthePC/CtransitionontheYangtzeplatform[1] .TheZhujiaqingFormationbelongstotheEarlytoMiddleMeishucunian (=Nemakit DaldynSt… 相似文献
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WANG Xiang BAO WanSu* & FU XiangQun Institute Electronic Technology People’s Liberation Army Information Engineering University Zhengzhou China 《科学通报(英文版)》2011,56(6):484-489
To search for a target n-product Boolean vector of fixed weight d, we propose an important method involving the notion of a fixed-weight "vector label" accompanied with a vector label restoration algorithm. Based on these, we present a new quantum algorithm designed to search for a fixed-weight target whose computation complexity, specifically O ((Cdn+1)1/2) , is better than that for a classical algorithm. Finally, we use the procedure to search for the NTRU private key as an example to verify the efficiency of the new algorithm in searching for fixed-weight target solutions. 相似文献
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