An analytical solution for the distribution of surface charge on a dielectric sphere due to the presence of an external point charge is presented. This solution describes how charge on the surface of the sphere is polarised in the electric field into regions of negative and positive charge. The polarisation effect (distribution of surface charge) generally varies with the separation between the sphere and the charge, and it is particularly significant at very short separations. Results obtained from the classical electrostatic model are in qualitative agreement with density functional theory calculations of charge separation in C60 and C240 fullerenes in the presence of an external point charge. This suggests that, from an electrostatic point of view, in the static electric field of external charges these molecules exhibit dielectric behaviour.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/c3cp53522c | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Dynamic analysis and optimal control of a hybrid fractional monkeypox disease model in terms of external factors.
Sci Rep
January 2025
Department of Mathematics and Statistics, College of Science, Taif University, P.O. Box 11099, 21944, Taif, Saudi Arabia.
The monkeypox virus (MPXV), which is a member of the Orthopoxvirus genus in the class Poxviridae, is the causative agent of the zoonotic viral infection MPXV. The disease is similar to smallpox, but it is usually less dangerous. This study examines the evolution of the MPXV epidemic in Canada with an emphasis on the effects of control employing actual data.
View Article and Find Full Text PDFIncidence and Outcomes of Secondary Bladder Cancer Following Radiation Therapy for Prostate Cancer: A Systematic Review and Meta-analysis.
Eur Urol Focus
January 2025
Department of Urology, Comprehensive Cancer Center, Medical University of Vienna, Vienna, Austria; Department of Urology, Semmelweis University, Budapest, Hungary; Institute for Urology and Reproductive Health, Sechenov University, Moscow, Russia; Department of Urology, UT Southwestern Medical Center, Dallas, TX, USA; Department of Urology, Weill Cornell Medical College, New York, NY, USA; Department of Urology, Second Faculty of Medicine, Charles University, Prague, Czechia; Division of Urology, Department of Special Surgery, University of Jordan, Amman, Jordan; Karl Landsteiner Institute of Urology and Andrology, Vienna, Austria; Research Center for Evidence Medicine, Urology Department, Tabriz University of Medical Sciences, Tabriz, Iran. Electronic address:
Background And Objective: There is an established association between secondary bladder cancers (SBCs) and radiotherapy (RT) for prostate cancer (PC), which remains a significant concern. Our aim was to update the evidence on SBC incidence across different RT modalities and to compare oncological outcomes for patients diagnosed with SBC to those diagnosed with primary bladder cancer (PBC).
Methods: We searched MEDLINE, Scopus, and Web of Science for studies on SBC following PC.
Assessing self-determined motivation for drinking alcohol via the Comprehensive Relative Autonomy Index for Drinking.
Front Psychol
January 2025
Department of Kinesiology, Pennsylvania State University, State College, PA, United States.
Introduction: Self-Determination Theory (SDT) examines human motivation in multiple domains; however, the only existing measure assessing SDT-informed behavioral regulations for drinking focuses on responsible drinker behaviors, rather than drinking , which is important given the alignment between SDT and harm reduction approaches to alcohol use. The aim of this study was to test the structural validity of the SDT-informed Comprehensive Relative Autonomy Index for Drinking (CRAI-Drinking) among college students.
Methods: Participants included two convenience samples with a total of 630 adult drinkers (M = 21.
On-chip non-contact mechanical cell stimulation - quantification of SKOV-3 alignment to suspended microstructures.
Heliyon
January 2025
Electrical and Computer Engineering, University of Canterbury, Christchurch, New Zealand.
Although the accumulation of random genetic mutations has been traditionally viewed as the main cause of cancer progression, altered mechanobiological profiles of the cells and microenvironment also play a major role as a mutation-independent element. To probe the latter, we have previously reported a microfluidic cell-culture platform with an integrated flexible actuator and its application for sequential cyclic compression of cancer cells. The platform is composed of a control microchannel in a top layer for introducing external pressure, and a polydimethylsiloxane (PDMS) membrane from which a monolithically-integrated actuator protrudes downwards into a cell-culture microchannel.
View Article and Find Full Text PDFEffects of data-driven respiratory gating on visualization and quantification of breast and upper abdominal cancers in FDG PET/CT examinations.
Ann Nucl Med
January 2025
Department of Radiology, The University of Osaka Hospital, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
Objective: Data-driven respiratory gating (DDG) has recently been introduced to improve image quality in the PET portion of PET/CT examinations. The latest DDG system does not require any external equipment or extended examination time. In this study, we investigated the effects of the new DDG system on the visualization and quantification of breast and upper abdominal cancers, comparing the results with those obtained using the standard free-breathing (STD) PET protocol.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!