Results 11 to 20 of about 1,463 (147)

About the Zagreb Indices [PDF]

Kemija u Industriji, 2010
The original Zagreb indices and some of their variants, such as the modified Zagreb indices, variable Zagreb indices, reformulated original Zagreb indices, reformulated modified Zagreb indices, Zagreb indices as complexity indices, general Zagreb indices,
Gutman, I., Miličević, A., Nikolić, S., Trinajstić, N.   +3 more
doaj   +4 more sources

On the Bounds of the First Reformulated Zagreb Index [PDF]

Turkish Journal of Analysis and Number Theory, 2016
The edge version of traditional first Zagreb index is known as first reformulated Zagreb index. In this paper, we analyze and compare various lower and upper bounds for the first reformulated Zagreb index and we propose new lower and upper bounds which are stronger than the existing and recent results [Appl. Math. Comp. 273 (2016) 16-20].
T. Mansour, M. A. Rostami, E. Suresh, G. B. A. Xavier   +3 more
openaire   +1 more source

Changes in Hungarian academic psychology after the end of “people's democracy”

Journal of the History of the Behavioral Sciences, Volume 59, Issue 1, Page 31-44, Winter 2023., 2023
Abstract The paper surveys the last 30 years of Hungarian academic psychology. Around 1989–1990, the time of the great social changes Hungarian psychology was rather Westernized, but still a relatively small scientific field and applied profession. The opening and liberalization of politics made psychology in Hungary a booming profession and a rich ...
Csaba Pléh
wiley   +1 more source

QSPR Study and Distance‐Based New Topological Descriptors of Some Drugs Used in the COVID‐19 Treatment

Journal of Mathematics, Volume 2023, Issue 1, 2023., 2023
In chemistry and medical sciences, it is essential to study the chemical, biological, clinical, and therapeutic aspects of pharmaceuticals. To save time and money, mathematical chemistry focuses on topological indices used in quantitative structure‐property relationship (QSPR) models to predict the properties of chemical structures.
Vignesh Ravi, Natarajan Chidambaram, Özge Çolakoğlu, Hanan Ahmed, Subhasri Jaganathan, Jayasri Jaganathan, G. Muhiuddin   +6 more
wiley   +1 more source

Extremal values of the first reformulated Zagreb index for molecular trees with application to octane isomers

AIMS Mathematics, 2023
<abstract><p>A connected acyclic graph in which the degree of every vertex is at most four is called a molecular tree. A number associated with a molecular tree that can help to approximate the physical or chemical properties of the corresponding molecule is called a topological index.
Shabana Anwar, Muhammad Kamran Jamil, Amal S. Alali, Mehwish Zegham, Aisha Javed   +4 more
openaire   +2 more sources

Association of hairdressing with cancer and reproductive diseases: A systematic review

Journal of Occupational Health, Volume 64, Issue 1, January/December 2022., 2022
Abstract Objectives To review recent epidemiological studies investigating carcinogenic or reprotoxic effects among hairdressers who seem to be at greater risk for systemic adverse effects of chemicals released from hair care products than consumers.
Željka Babić, Marija Macan, Zrinka Franić, Sarah Hallmann, Martin S. Havmose, Jeanne D. Johansen, Swen M. John, Cara Symanzik, Wolfgang Uter, Patricia Weinert, Henk F. van der Molen, Sanja Kezic, Rajka Turk, Jelena Macan   +13 more
wiley   +1 more source

[Retracted] The Reformulated F‐Index of Vertex and Edge F‐Join of Graphs

Journal of Chemistry, Volume 2022, Issue 1, 2022., 2022
The valency based topological indices (TIs) are defined by algebraic functions as the chemical graph theory tools in which the structural parameters are used as input and the output is related with the topology of chemical species. In theoretical chemistry, the TIs are mainly used to investigate/develop the QSAR and QSPR investigations of the molecular
Durbar Maji, Ganesh Ghorai, Faria Ahmed Shami, Haidar Ali   +3 more
wiley   +1 more source

On the Inverse Problem for Some Topological Indices

Journal of Mathematics, 2021
The study of the inverse problem (IP) based on the topological indices (TIs) deals with the numerical relations to TIs. Mathematically, the IP can be expressed as follows: given a graph parameter/TI that assigns a non-negative integer value g to every ...
Durbar Maji, Ganesh Ghorai, Muhammad Khalid Mahmood, Md. Ashraful Alam   +3 more
doaj   +1 more source

Some More Results on Reciprocal Degree Distance Index and ℱ‐Sum Graphs

Journal of Mathematics, Volume 2022, Issue 1, 2022., 2022
A chemical invariant of graphical structure Z is a unique value characteristic that remains unchanged under graph automorphisms. In the study of QSAR/QSPR, like many other chemical invariants, reciprocal degree distance has played a significant role to estimate the bioactivity of several compounds in chemistry.
Asima Razzaque, Saima Noor, Salma Kanwal, Ayesha Manzoor, Gohar Ali   +4 more
wiley   +1 more source

Ordering Acyclic Connected Structures of Trees Having Greatest Degree‐Based Invariants

Complexity, Volume 2022, Issue 1, 2022., 2022
Being building block of data sciences, link prediction plays a vital role in revealing the hidden mechanisms that lead the networking dynamics. Since many techniques depending in vertex similarity and edge features were put forward to rule out many well‐known link prediction challenges, many problems are still there just because of unique formulation ...
S. Kanwal, M.K. Siddiqui, E. Bonyah, T. S. Shaikh, I. Irshad, S. Khalid, Keke Shang   +6 more
wiley   +1 more source