نتایج جستجو برای: connectivity and tenacity

تعداد نتایج: 16836055  

Journal: Iranian Journal of Mathematical Chemistry 2013
S. MORADI T. DOŠLIĆ Z. YARAHMADI

In this paper we present explicit formulas for the eccentric connectivity index of three classes of chain hexagonal cacti. Further, it is shown that the extremal chain hexagonal cacti with respect to the eccentric connectivity index belong to one of the considered types. Some open problems and possible directions of further research are mentioned in the concluding section.

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Journal: :Sen'i Gakkaishi 1984

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Journal: :Nature 1905

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Journal: :International Journal of Innovation in the Digital Economy 2017

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Journal: International Journal of Engineering 2007
Abdolrasool Moghassem,

The influence of dyeing and spinning on the characteristics of cotton fibers and its impact on the properties of cotton mélange yarn has been investigated. Grey cotton fibers with mean fiber length and fineness of 29 mm and 4.2 micronair were pre-treated and dyed. Three ring yarns were spun from 100 % grey cotton (R.R.Y), 50-50 % blend of dyed and grey cotton (M.R.Y) and 100 % dyed cotton fiber...

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Journal: Basic and Clinical Neuroscience 2023
Ahmad Shalbaf, Erfan Rezaei,

The right and left hand Motor Imagery (MI) analysis based on the electroencephalogram (EEG) signal can directly link the central nervous system to a computer or a device. This study aims to identify a set of robust and nonlinear effective brain connectivity features quantified by transfer entropy (TE) to characterize the relationship between brain regions from EEG signals and create a hierarchi...

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Journal: Iranian Journal of Mathematical Chemistry 2015
W. Gao, Y. Gao,

In theoretical chemistry, -modified Wiener index is a graph invariant topological index to analyze the chemical properties of molecular structure. In this note, we determine the minimum -modified Wiener index of graph with fixed connectivity or edge-connectivity. Our results also present the sufficient and necessary condition for reaching the lower bound.

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Journal: :Tekstil Ve Konfeksiyon 2022

Alkaline hydrolysis is a useful method for enhancing properties of polyesters. In this study, the alkali three polyester filament yarns (poly(ethylene terephthalate) (PET), poly(trimethylene (PTT) and poly(butylene (PBT)) was comparatively investigated under various conditions such as concentration, solvent mixture, process duration temperature. The weight loss different evaluated. Scanning ele...

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Journal: Iranian Journal of Mathematical Chemistry 2013
M. GHORBANI M. ROSTAMI M. SOHRABI-HAGHIGHAT

The atom-bond connectivity index of graph is a topological index proposed by Estrada et al. as ABC (G)  uvE (G ) (du dv  2) / dudv , where the summation goes over all edges of G, du and dv are the degrees of the terminal vertices u and v of edge uv. In the present paper, some upper bounds for the second type of atom-bond connectivity index are computed.

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ژورنال: پژوهشنامه مدیریت حوزه آبخیز 2017
سعدالدین, امیر, شتایی جویباری, شعبان, لطفعلیان, مجید, مصطفی, محسن,

     Planning, construction and assessment of road network are among the investigations for infrastructure development at watershed scales. The main aim of this study is assessing the road network connectivity in the Chehel-Chay Watershed, located in Golestan Province using Alpha (α), Beta (β), Gamma (γ), Eta (η), network density and detour indices in graph theory. The available road network ma...

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