Results 251 to 260 of about 524,381 (270)

Counting Chemical Structures Resembling Trees

2018 International Conference on Advances in Computing, Communications and Informatics (ICACCI), 2018
Trees have been used for counting chemical structures of non-isomorphic forms. Graph enumeration can be either isomorphic or non-isomorphic. Isomorphic tree enumeration arises in the context of listing all isomorphic subtrees of a given graph whereas non-isomorphic enumeration lists all unique trees that satisfy given constraints. We study the chemical
Athira Selvam, Sravya K V S P Sai, Bhadrachalam Chitturi   +2 more
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The Average Wiener Index of Trees and Chemical Trees

Journal of Chemical Information and Computer Sciences, 1999
Meir and Moon (J. Combin. Theory 1970, 8, 99−103) reported a combinatorial formula for the average value of the distance between a pair of vertices in the class of all labeled trees with a fixed number (= n) of vertices. From this result an expression for the average Wiener index 〈Wn〉lab of labeled n-vertex trees follows immediately.
Andrey A. Dobrynin, Ivan Gutman
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Fault tree synthesis for chemical processes

AIChE Journal, 1974
AbstractThis paper outlines the concepts for a systematic approach to the safety analysis of chemical processing systems. A procedure for automatically generating fault trees is presented. The fault trees describe nearly all the failure modes for the system under analysis.
Gary J. Powers, Frederick C. Tompkins
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Mining environmental chemicals with boosted trees

Proceedings of the 35th Annual ACM Symposium on Applied Computing, 2020
In response to scientific reports and legislative actions, the United States Environmental Protection Agency (EPA) launched an Endocrine Disruptor Screening Program (EDSP). The overarching aim of this program is to develop novel analytical and computational tools and methods for the detection of environmental chemicals causing aberrations in estrogen ...
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The Estrada index of chemical trees

Journal of Mathematical Chemistry, 2009
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Ilić, Aleksandar, Stevanović, Dragan
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TECHNIQUES FOR INJECTING CHEMICALS INTO TREES

Arboricultural Journal, 1985
Summary Many existing techniques for applying solutions to woody plants are inexact, or require expensive apparatus and specialised training to use. Simple, cheap, and accurate methods are described for injecting volumes from 1 μ1 to 100 ml into main stems or branches of 5 mm diameter upwards.
J McP Dick, K A Longman
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Decision tree for chemical detection applications

Analytical Chemistry, 1985
Analyse discriminante et par regression de l'augmentation de la fluorescence du (diphenylacetyl-2) indanedione-1,3 ((p-dimethylamino) benzaldazine)-1, reactif analytique possible pour pesticide, aminoacide, composes ...
William P. Ashman, James H. Lewis, Edward J. Poziomek   +2 more
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Induced chemical defences in Colophospermum mopane trees

African Journal of Range & Forage Science, 2007
A field experiment was conducted in which Mopane (Colophospermum mopane) trees were subjected to three different canopy treatments:felling of trees at a mean height of 0.7m above ground level, felling at a height of 2m, or pruning of selected branches.
Wessels, D.C.J., van der Waal, C., de Boer, W.F.   +2 more
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Chemical Interactions between Cloud Droplets and Trees

1988
The chemical composition of both liquid droplet and leaf surface determines the behaviour of a cloud droplet on interception by vegetation. In some circumstances, particularly in wind-driven cloud, droplets may not adhere to foliage. Once on the leaf surface, the contact angle between the droplet and surface will determine the amount of water held by ...
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Caterpillar (Gutman) Trees in Chemical Graph Theory

1990
Gutman trees (also known as caterpillar trees and benzenoid trees) are demonstrated to be elegant storage devices of information on graph-theoretical properties of many mathematical objects including benzenoid graphs, rook boards, king polyomino graphs, Clar graphs, and Young diagrams.
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