927 resultados para AUTORITARISMO - ETIOPÍA - 1994-2010


Relevância:

20.00% 20.00%

Publicador:

Resumo:

Re-examination of the syntypes of the capillariid nematode Neocapillaria phoxini Yu et Wang, 1994, the type species of Neocapillaria Yu et Wang, 1994, described from the intestine of the freshwater fish Phoxinus lagowskii variegatus Gunther (Cyprinidae) from China, confirmed its morphological similarity with species of Freitascapillaria Moravec, 1987, to which it is transferred as Freitascapillaria phoxini (Yu et Wang, 1994) comb. n. Consequently, Neocapillaria Yu et Wang, 1994 (a homonym to Neocapillaria Moravec, 1987) and Sinocapillaria Moravec et Spratt, 1998 become junior synonyms of Freitascapillaria. Skrjabinocapillaria gigantea is transferred to Freitascapillaria as F. gigantea (Wang, 1984) comb. n.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

于G批量导入至Hzhangdi

Relevância:

20.00% 20.00%

Publicador:

Resumo:

于G批量导入至Hzhangdi

Relevância:

20.00% 20.00%

Publicador:

Resumo:

于G批量导入至Hzhangdi

Relevância:

20.00% 20.00%

Publicador:

Resumo:

于G批量导入至Hzhangdi

Relevância:

20.00% 20.00%

Publicador:

Resumo:

于G批量导入至Hzhangdi

Relevância:

20.00% 20.00%

Publicador:

Resumo:

于G批量导入至Hzhangdi

Relevância:

20.00% 20.00%

Publicador:

Resumo:

利用中国知识资源总库的中国引文数据库检索《水土保持研究》在1994-2006年所载论文的被引用情况,采用文献计量学方法对该刊1994-2006年载文被《中国期刊文献引证数据库》来源期刊引用的情况进行统计分析及评价。从文献引证的角度透视《水土保持研究》的学术水平。该刊1994-2006年共载文2098篇,被引用2018篇,占载文总数的96.62%。2001-2006年该刊影响因子、即年指标等文献计量指标逐年上升,分析表明:《水土保持研究》载文质量较高,在该学科有较大的学术影响力。

Relevância:

20.00% 20.00%

Publicador:

Resumo:

重新系统描述了蜂窝蛋科蜂窝蛋属的模式蛋种宁夏蜂窝蛋(Faveoloolithus ningxiaensis)和杨氏蛋属的模式蛋种夏馆杨氏蛋(Youngoolithus xiaguanensis), 并记述了产自浙江天台的蜂窝蛋科新材料,建立一个新的蛋属——副蜂窝蛋属(Parafaveoloolithus), 及3个新的蛋种——Parafaveoloolithus microporus, P. macroporus和P. tiansicunensis。根据赵资奎1994年提出的恐龙蛋分类中具有鉴定意义的几个特征,重新讨论了现有蜂窝蛋的分类地位,提出杨氏蛋属应当提升为科一级的分类单元,总结了蜂窝蛋科内属级和种级分类单元的主要鉴定特征以及蜂窝蛋类的鉴定方法。

Relevância:

20.00% 20.00%

Publicador:

Resumo:

We present photoluminescence studies on highly dense two-dimensional electron gases in selectively Si delta-doped GaAs/In0.18Ga0.82As/Al0.25Ga0.75As quantum wells (N(s) = 4.24 x 10(12) cm-2). Five well-resolved photoluminescence lines centered at 1.4194, 1.4506, 1.4609, 1.4695 and 1.4808 eV were observed, which are attributed to the subband excition emission. The subband separations clearly exhibit the feature of a typical quantum well with triangle and square potential. These very intensive and sharp luminescence peaks with linewidths of 2.2 to 3.5 meV indicate the high quality of the structures. Their dependence on the excitation intensity and temperatures are also discussed.