Results 51 to 60 of about 472,348 (280)
On Certain Aspects of Topological Indices
Journal of Mathematics, 2021 A topological index, also known as connectivity index, is a molecular structure descriptor calculated from a molecular graph of a chemical compound which characterizes its topology.
Tanweer Ul Islam +4 more
doaj +1 more source
Understanding sediment connectivity from soil erosion perspective
Shui kexue jinzhan, 2021 Sediment connectivity is closely related to geomorphology, topography, ecological hydrology, soil erosion, nutrient and pollutant movement, and water quality conservation. As one of the hot topics in soil erosion research during the past decade, sediment
Guanghui ZHANG
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A METHODOLOGY FOR CITY LEVEL URBAN ROAD NETWORK CONNECTIVITY ANALYSIS USING GEOGRAPHICAL INFORAMTION SYSTEMS (GIS) [PDF]
Civil Engineering Journal, 2020 In most of the urban cities in India, the existing road network structure is unable to meet the increasing travel demand. In this context, there is a need to utilize the existing road network ina more efficient manner.
Kurre Sai Sahitya, CSRK Prasad
doaj +1 more source
Gutman index, edge-Wiener index and edge-connectivity
Transactions on Combinatorics, 2020 Summary: We study the Gutman index \(\mathrm{Gut}(G)\) and the edge-Wiener index \(W_e (G)\) of connected graphs \(G\) of given order \(n\) and edge-connectivity \(\lambda\). We show that the bound \(\mathrm{Gut}(G) \leq\frac{2^4 \cdot 3}{5^5 (\lambda+1)} n^5 + O(n^4)\) is asymptotically tight for \(\lambda \geq 8\). We improve this result considerably
Mazorodze, Jaya +2 more
openaire +2 more sources
Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system
FEBS Letters, EarlyView.Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley +1 more source
AKCE International Journal of Graphs and Combinatorics, 2017 The general sum-connectivity index, general product-connectivity index, general Zagreb index and coindices of line graphs of subdivision graphs of tadpole graphs, wheels and ladders have been reported in the literature.
Harishchandra S. Ramane +2 more
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FEBS Letters, EarlyView.Mitochondrial remodeling shapes neural and glial lineage progression by matching metabolic supply with demand. Elevated OXPHOS supports differentiation and myelin formation, while myelin compaction lowers mitochondrial dependence, revealing mitochondria as key drivers of developmental energy adaptation.
Sahitya Ranjan Biswas +3 more
wiley +1 more source
On Eccentricity-Based Topological Indices Study of a Class of Porphyrin-Cored Dendrimers
Biomolecules, 2018 It is revealed from the previous studies that there is a strong relation between the chemical characteristic of a chemical compound and its molecular structure.
Wei Gao +5 more
doaj +1 more source
Ecological Indicators, 2021 Rivers are very vulnerable to fragmentation caused by the presence of man-made barriers. To restore river basin connectivity, numerous indices have been developed to calculate river fragmentation and optimise barrier mitigation actions.
Amaia A. Rodeles +2 more
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Brainstem atrophy in focal epilepsy destabilizes brainstem-brain interactions: Preliminary findings. [PDF]
, 2019 BACKGROUND: MR Imaging has shown atrophy in brainstem regions that were linked to autonomic dysfunction in epilepsy patients. The brainstem projects to and modulates the activation state of several wide-spread cortical/subcortical regions.
Bateman, Lisa M. +4 more
core +1 more source