Results 51 to 60 of about 7,915 (234)

Probabilistic analysis of the First Zagreb index [PDF]

open access: yesTransactions on Combinatorics, 2013
In this paper we study the Zagreb index in bucket recursive trees containing buckets with variable capacities. This model was introduced by Kazemi in 2012.
Ramin Kazemi
doaj  

M-Polynomials and Degree-Based Topological Indices of the Molecule Copper(I) Oxide

open access: yesJournal of Chemistry, 2021
Topological indices are numerical parameters used to study the physical and chemical residences of compounds. Degree-based topological indices have been studied extensively and can be correlated with many properties of the understudy compounds.
Faryal Chaudhry   +5 more
doaj   +1 more source

Plant diversity estimates of Mediterranean islands differ among biodiversity databases

open access: yesEcography, EarlyView.
Large‐scale biodiversity databases encompass three main types of data for plants, namely single species point occurrences, co‐occurrences in vegetation plots, and checklists for specific areas. Evidence shows that such data types exhibit specific biases, reporting different species assemblages at local scales.
Francesco Santi   +30 more
wiley   +1 more source

Factors related to loss to follow‐up and low compliance in Helicobacter pylori‐infected children: The EuroPedHp Registry

open access: yesJournal of Pediatric Gastroenterology and Nutrition, EarlyView.
Factors related to loss to follow‐up and low compliance in Helicobacter pylori‐infected children. Abstract Objectives Monitoring for Helicobacter pylori (H. pylori)‐eradication is important, since symptom improvement does not indicate treatment success. Using EuroPedHp Registry data, we investigated characteristics of children missing monitoring visits
Thu Giang Le Thi   +42 more
wiley   +1 more source

On some topological indices of zero divisor graphs of direct product of three finite fields

open access: yesExamples and Counterexamples
In this paper, we determine some degree-based topological indices, such as the Sombor index, the first and second Zagreb indices, the forgotten topological index, the Narumi–Katayama index, the first and second multiplicative Zagreb indices, the atom ...
Subhash Mallinath Gaded   +1 more
doaj   +1 more source

Open letter: The need for a site‐based biodiversity standard measuring and certifying impacts from nature‐based projects

open access: yesPLANTS, PEOPLE, PLANET, EarlyView.
Despite growing investment in restoration, weak accountability and poor biodiversity monitoring mean many projects fail to achieve ecological recovery. The Global Biodiversity Standard (TGBS) offers a practical way to ensure that restoration finance delivers measurable gains for nature.
David Bartholomew   +254 more
wiley   +1 more source

Molecular descriptors of benzenoid systems

open access: yesQuímica Nova
Molecular descriptors are being widely used in QSAR/QSPR studies in chemistry and drug designing as well as modeling of compounds. Different topological descriptors have been formulated to investigate the physio chemical properties and chemical ...
Nazeran Idrees   +4 more
doaj   +1 more source

Cameras do not always take a full picture: wolf activity patterns revealed by accelerometers versus road‐positioned camera traps

open access: yesRemote Sensing in Ecology and Conservation, EarlyView.
Camera traps have become an increasingly popular non‐invasive alternative to animal‐attached devices for studying wildlife behaviour. This study compared wolf (Canis lupus) activity patterns derived from collar accelerometers and road‐positioned camera traps and revealed strong overall agreement but also important seasonal and diel mismatches between ...
Katarzyna Bojarska   +7 more
wiley   +1 more source

Big Bird: A global dataset of birds in drone imagery annotated to species level

open access: yesRemote Sensing in Ecology and Conservation, EarlyView.
Drones are a valuable tool for surveying birds, but manually detecting and identifying birds in drone images is costly. We assembled a diverse dataset of 23 865 images of birds captured with 21 different drones across 11 countries. We labelled 4824 of these images, detailing the location, species, posture category, age category, and sex of 49 990 birds
Joshua P. Wilson   +19 more
wiley   +1 more source

Entropy measures of dendrimers using degree based indices

open access: yesSouth African Journal of Chemical Engineering
Topological indices play a crucial role as molecular descriptors in QSAR/QSPR research. Graph entropy measurements are of great importance in various fields like chemistry, discrete mathematics, and biology.
Ali Ovais   +4 more
doaj   +1 more source

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