Results 11 to 20 of about 7,782 (241)
On the relationship between variable Wiener index and variable Szeged index [PDF]
Applied Mathematics and Computation, 2022 We resolve two conjectures of Hriňáková, Knor and Škrekovski (2019) concerning the relationship between the variable Wiener index and variable Szeged index for a connected, non-complete graph, one of which would imply the other. The strong conjecture is that for any such graph there is a critical exponent in $(0,1]$, below which the variable Wiener ...
Cambie, S, Haslegrave, J
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Influence of site, stand, and soil factors on sapling regeneration in typical Quercus Forests of Northern China [PDF]
Frontiers in Plant ScienceIntroductionThis study aims to characterize sapling regeneration in typical Quercus forests in Beijing, investigate the relationship between sapling density and environmental factors, and provide a theoretical basis for sustaining the ecological ...
Guangshuang Duan +8 more
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On variable Wiener index [PDF]
Indian journal of chemistry. Sect. A: Inorganic, physical, theoretical & analytical, 2003 A variable Wiener index W-nu, applicable only to acyclic structures, is defined as Sigma [n(1)(e) n(2)(e)](lambda). For the optimal exponent, that value of lambda should be selected which gives the smallest standard error of estimate, s, in the structure-property-modeling. As a test case, the structure-boiling point modeling of isomeric octanes is used.
Trinajstić, Nenad +3 more
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The Variable Wiener Index of Trees with Given Maximum Degree [PDF]
Proceedings of the 2014 International Conference on Computer, Communications and Information Technology, 2014 Fuyi Wei +5 more
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Equiseparable chemical trees [PDF]
Journal of the Serbian Chemical Society, 2003 Let n1(e|T) and n2(e|T) denote the number of vertices of a tree T, lying on the two sides of the edge e. Let T1 and T2 be two trees with equal number of vertices, let e be an edge of T1 and f an edge of T2.
BORIS FURTULA +2 more
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Progress in Fishery Sciences, 2023 Due to climate change, the biomass and biodiversity of fishery resources are increasing at higher latitudes and decreasing at lower latitudes (reflected by the mean temperature of the biomass, MTB). Studies have shown that the change in catch composition
Yue JIN +3 more
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What Affects the Use Flexibility of Pocket Parks? Evidence from Nanjing, China
Land, 2022 The use flexibility of pocket parks is one of the essential factors that determine their service compatibility, efficiency, and attraction for park users in densely populated cities. To examine the factors that affect the use flexibility of pocket parks,
Conghui Zhou +3 more
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The relationship between ecological species groups and non-parametric indicators of biodiversity and environmental factors in Arasbaran (Case study: Ilgenechai & Kaleybarchai Watershed) [PDF]
تحقیقات جنگل و صنوبر ایران, 2017 The aim of this study was identification of ecosystem units in Arasbaran forests and determination of effective environmental factors and biodiversity indices on their distribution.
Allahverdi Mohammadzadeh +2 more
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Identification of nonlinear models with NARX and Hammerstein-Wiener structures applied to a pHneutralization plant. [PDF]
, 2021 Neste trabalho estuda-se a identificação não linear para encontrar os modelos matemáticos de três variáveis de processo (Temperatura, Nível e pH) de uma planta de neutralização de pH.
Estofanero Larico, Edwin Red
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International Journal of Forestry Research, 2023 Owing to its variable topographic features, Ethiopia is endowed with rich biological resources. However, nowadays, these vital resources, mainly forests, are declining alarmingly, largely, due to agricultural expansion and energy consumption.
Getinet Masresha Kassa +2 more
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