نتایج جستجو برای: cd index

تعداد نتایج: 440827  

Journal: :journal of health sciences and surveillance system 0
mohammad ali baghapour department of environmental health engineering, school of health and nutrition, shiraz university of medical sciences, shiraz, iran nasser talebbeydokhti department of civil engineering, college of engineering, shiraz university, shiraz, ir iran hamidreza tabatabee department of epidemiology, school of health, shiraz university of medical sciences, shiraz, ir iran amir fadaei nobandegani department of environmental health engineering, school of health, shiraz university of medical sciences, shiraz, ir iran

background: groundwater nitrate pollution is an important environmental problem in water resources management. in this regard, specific measures aiming at prevention of water pollution will be helpful to managers and decision-makers. identification of aquifers’ vulnerable areas and determination of groundwater protection zones using most widely used models, such as drastic and cd, are one of th...

1998
Margaret READDY

Dedicated to Gian-Carlo Rota on his 2 6 th birthday. Abstract The linear span of isomorphism classes of posets, P, has a Newtonian coalgebra structure. We observe that the ab-index is a Newtonian coalgebra map from the vector space P to the algebra of polynomials in the non-commutative variables a and b. This enables us to obtain explicit formulas showing how the cd-index of the face lattice of...

1998
Richard EHRENBORG

The linear span of isomorphism classes of posets, P, has a Newtonian coalgebra structure. We observe that the ab-index is a Newtonian coalgebra map from the vector space P to the algebra of polynomials in the non-commutative variables a and b. This enables us to obtain explicit formulas showing how the cd-index of the face lattice of a convex polytope changes when taking the pyramid and the pri...

Journal: :Discrete & Computational Geometry 2008

Journal: :JASIST 2013
Loet Leydesdorff Filippo Radicchi Lutz Bornmann Claudio Castellano Wouter de Nooy

Two methods for comparing impact factors and citation rates across fields of science are tested against each other using citations to the 3,705 journals in the Science Citation Index 2010 (CD-Rom version of SCI) and the 13 field categories used for the Science and Engineering Indicators of the U.S. National Science Board. We compare (a) normalization by counting citations in proportion to the l...

2016
Tao Wang Hongjue Wang Xiaoxia Wang Peter Csermely

Lots of similarity-based algorithms have been designed to deal with the problem of link prediction in the past decade. In order to improve prediction accuracy, a novel cosine similarity index CD based on distance between nodes and cosine value between vectors is proposed in this paper. Firstly, node coordinate matrix can be obtained by node distances which are different from distance matrix and...

Journal: :JASIST 2013
Loet Leydesdorff Ping Zhou Lutz Bornmann

Using the CD-ROM version of the Science Citation Index 2010 (N = 3,705 journals), we study the (combined) effects of (i) fractional counting on the impact factor (IF) and (ii) transformation of the skewed citation distributions into a distribution of 100 percentiles and six percentile rank classes (top-1%, top-5%, etc.). Do these approaches lead to field-normalized impact measures for journals?...

Journal: :Bioresource technology 2012
Shuhe Wei Yunmeng Li Jie Zhan Shanshan Wang Jiangong Zhu

Hoagland solution was used to determine the root morphology properties of Rorippa globosa (Turcz.) Thell. and Rorippa palustris (Leyss.) Bess. Under the conditions of Cd spiked at 2.5 and 5 mg kg(-1), R. globosa showed all hyperaccumulative characteristics and was a Cd-hyperaccumulator. In contrast, R. palustris was a non-hyperaccumulator. The total root lengths, total root surface areas and to...

Journal: :Journal of Combinatorial Theory, Series A 2016

Journal: :Advances in Mathematics 2014

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