Results 21 to 30 of about 19,346,652 (261)

An experimental evaluation of grouping definitions for moving entities

open access: yesJournal of Spatial Information Science, 2022
One important pattern analysis task for trajectory data is to find a group: a set of entities that travel together over a period of time. In this paper, we compare four definitions of groups by conducting extensive experiments using various data sets ...
Lionov Wiratma   +3 more
doaj   +1 more source

Which finite simple groups are unit groups? [PDF]

open access: yes, 2014
We prove that if $G$ is a finite simple group which is the unit group of a ring, then $G$ is isomorphic to either (a) a cyclic group of order 2; (b) a cyclic group of prime order $2^k -1$ for some $k$; or (c) a projective special linear group $PSL_n ...
Davis, Christopher, Occhipinti, Tommy
core   +2 more sources

Methylation of Eugenol Using Dimethyl Carbonate and Bentonite as Catalyst

open access: yesIndonesian Journal of Chemistry, 2015
Eugenol is a compound with a variety of reactive functional groups such as allyl, hydroxy and methoxy. The presence of the functional groups brings eugenol possible to undertake the transformation into various derivative compounds with diverse activities.
Dina Asnawati   +5 more
doaj   +1 more source

Client-side rogue access-point detection using a simple walking strategy and round-trip time analysis

open access: yesEURASIP Journal on Wireless Communications and Networking, 2020
Traditional rogue access-point (AP) detection mechanisms are employed in network administration to protect network infrastructure and organization; however, these mechanisms do not protect end users from connecting to a rogue-AP.
Songrit Kitisriworapan   +2 more
doaj   +1 more source

Assessing Learners’ Conceptual Understanding of Introductory Group Theory Using the CI2GT: Development and Analysis of a Concept Inventory

open access: yesEducation Sciences, 2022
Prior research has shown how incorporating group theory into upper secondary school or undergraduate mathematics education may positively impact learners’ conceptual understanding of mathematics in general and algebraic concepts in particular.
Joaquin Marc Veith   +2 more
doaj   +1 more source

Class groups and automorphism groups of group rings [PDF]

open access: yesGlasgow Mathematical Journal, 1986
This paper is a sequel to [2]. A polycyclic-by-finite group G was there called dihedral free if G contains no subgroup isomorphic to 〈b, a:ba = b-1 a2 = 1〉 whose normalizer has finite index in G. It was shown in [2, Theorem F] that, if R is a commutative Noetherian domain, the group ring RG is a prime Noetherian maximal order if and only if R is ...
openaire   +1 more source

On Groups of Automorphism of Lie Groups [PDF]

open access: yesProceedings of the National Academy of Sciences, 1944
Not ...
openaire   +3 more sources

An Exploration of the Implications of Sequencing Order on Group Pain Interventions in Veterans

open access: yesRheumato, 2022
Background: Efforts to increase acceptance and reduce avoidance behaviors in patients who suffer from chronic pain are likely to have additional beneficial effects on pain management.
David Cosio, Madison Simons
doaj   +1 more source

Impact of a community-based participatory research project with underserved communities at risk for hepatitis C virus in Ho Chi Minh City, Vietnam: an evaluation study

open access: yesResearch Involvement and Engagement
Background Participatory approaches have become a widely applied research approach. Despite their popularity, there are many challenges associated with the evaluation of participatory projects.
My Nguyen Le Thao   +13 more
doaj   +1 more source

The Fundamental Group of a Group Manifold [PDF]

open access: yesProceedings of the National Academy of Sciences, 1934
The study of the interrelations between group structures and topological structures is one of the interesting recent developments of group theory. It has become well known that a space @ which is at the same time a continuous group cannot be of arbitrary topological structure.
openaire   +4 more sources

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