Modelling of a compact anisotropic star as an anisotropic fluid sphere in f(T)f(T) gravity

In this paper, we have studied the new exact model of anisotropic star in $f(T)$ theory of gravity. The dynamical equations in $f(T)$ theory with the anisotropic fluid have been solved by using Krori-Barua solution. We have determined that all the obtained solutions are free from central singularity and potentially stable. The observed values of mass and radius of the different strange stars RX J 1856-37, Her X-1, and Vela X-12 have been used to calculate the values of unknown constants in Krori and Barua metric. The physical parameters like anisotropy, stability and redshift of the stars have been investigated in detail.Comment: Accepted in the Canadian Journal of Physic

Timely Data Delivery in a Realistic Bus Network

Abstract—WiFi-enabled buses and stops may form the backbone of a metropolitan delay tolerant network, that exploits nearby communications, temporary storage at stops, and predictable bus mobility to deliver non-real time information. This paper studies the problem of how to route data from its source to its destination in order to maximize the delivery probability by a given deadline. We assume to know the bus schedule, but we take into account that randomness, due to road traffic conditions or passengers boarding and alighting, affects bus mobility. We propose a simple stochastic model for bus arrivals at stops, supported by a study of real-life traces collected in a large urban network. A succinct graph representation of this model allows us to devise an optimal (under our model) single-copy routing algorithm and then extend it to cases where several copies of the same data are permitted. Through an extensive simulation study, we compare the optimal routing algorithm with three other approaches: minimizing the expected traversal time over our graph, minimizing the number of hops a packet can travel, and a recently-proposed heuristic based on bus frequencies. Our optimal algorithm outperforms all of them, but most of the times it essentially reduces to minimizing the expected traversal time. For values of deadlines close to the expected delivery time, the multi-copy extension requires only 10 copies to reach almost the performance of the costly flooding approach. I

Examining the association between C-Reactive protein and obesity by using the fractional polynomial approach; applying on NHANES dataset from 2001 to 2010

This is the final version of the article. Available from Herbert Publications Ltd via the DOI in this record.Objective: This study uses a flexible nonlinear approach, Fractional polynomial models (FPs), to examine the association between obesity and C-reactive protein to select the best fitted model within 44 potentially FP models. Methods: Data for 5 years (2001-2010) of the National Health Interview Survey (NHANES) was used. All respondents aged between 17 and 74 were included in the analysis. CRP was transformed to ln(CRP) to eliminate skewness and missing values were removed from the analysis. A fractional polynomial approach was applied to measure the relationship between elevated levels of CRP and obesity. A closed test was used to select the best model among the 44 models. Results: The best fitted fractional polynomial regression model contained the powers -2 and -2 for BMI. The association between the ln(CRP) and BMI when estimated using the FP approach exhibited a J-shaped pattern for women and men. Women have a higher risk of elevated CRP level compared to men. A deviance difference test yielded a significant improvement in model fit of -2 and -2 compared to other BMI functions. Conclusion: The fractional polynomial regression model is the most robust estimator of BMI compared to other linear or nonlinear models.The authors would like to acknowledge the European Centre for Environment and Human Health at the University of Exeter Medical School- UK and the School of commerce, Faculty of commerce Ain Shams University , Cairo- Egypt

Prognostic Value of Computed Tomography : Measured Parameters of Body Composition in Primary Operable Gastrointestinal Cancers

Professor Graeme Murray, Department of Pathology, University of Aberdeen provided us access to the colorectal cancer pathology databases from which the colorectal component of the research was based. Conflict of interest There are no conflicts of interest.Peer reviewedPublisher PD

Preparation and Study of Properties of CdO: Al Thin Films Prepared by Chemical Spraying

The studies that are related to transparent conducting oxides and the consistent motivation to improve their different characteristics have been increasingly conducted. In this work, pristine and Aluminium doped cadmium oxide, CdO: Al thin films, were synthesized by a deposition over a substrate made from glass employing spray pyrolysis technique for several Al fractions (0, 3.0, and 6.0) v/v %. The effect of Al dopant on the microstructure, morphological, optical and electrical characterisation of CdO thin films were investigated elaborately. Pure CdO and (Al: CdO) exhibited face centred cubic structure with strong peak of 200 that reflected a preferential growth. The roughness of films was increased for the samples doped with Al from (38.54 to 149.2) nm according to the increment in Al concentration. The optical analysis confirmed that the value of band gap manifested a decrement (2.5 - 2.0) eV associated with the increment in doping by Al. The measurements of Hall Effect elucidated that the CdO and Al: CdO films classified as n-type semiconductors. The range of electrical conductivity of the Al: CdO films evinced a variation from (42.4 to 35.3) Ω-1.cm- 1. The results concluded from some graphs emphasized that the activation energy is equal to zero, and the Al doped CdO films became a degenerated semiconductor

Activité antimicrobienne de produits naturels originaires du Nord de l’Ontario

La multirésistance microbienne pose de grands problèmes au niveau de la santé publique. En fait, il ne reste que peu d’agents antimicrobiens effectifs contre certains microbes multirésistants. Les scientifiques sont donc à la recherche de nouveaux produits antimicrobiens. Cette recherche a évalué l’activité antimicrobienne de substances naturelles provenant de plantes originaires du Nord de l’Ontario. Vingt-cinq extraits, dix fractions et dix-neuf composés purs ont été testés contre des microbes pathogènes, soientEscherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa et Candida albicans. L’activité antimicrobienne des produits naturels a été observée en utilisant la technique de dosage sur microplaque qui emploie le résazurin, et la concentration minimale inhibitrice (CMI) des produits a été déterminée. Afin de démontrer que l’activité antimicrobienne des substances naturelles n’était pas limitée à une seule espèce, certains composés purs ont été testés contre des microbes secondaires, soient Streptococcus lactis, Mycobacterium phlei et Schizosaccharomyces octosporus. Quatre extraits de plantes (Chimaphila umbellata, Betula papyrifera, Rhus typhina et Fraxinus pennsylvanica) et six composés purs (acide gallique, éthyle gallate, acide cafféique, acide synapique, acide gentisique et acide chlorogénique) ont démontré une activité antibactérienne ou antifongique. Ces résultats démontrent que ces produits naturels ont le potentiel d’être développés en nouveaux agents antimicrobiens

Effective surface motion on a reactive cylinder of particles that perform intermittent bulk diffusion

In many biological and small scale technological applications particles may transiently bind to a cylindrical surface. In between two binding events the particles diffuse in the bulk, thus producing an effective translation on the cylinder surface. We here derive the effective motion on the surface, allowing for additional diffusion on the cylinder surface itself. We find explicit solutions for the number of adsorbed particles at one given instant, the effective surface displacement, as well as the surface propagator. In particular sub- and superdiffusive regimes are found, as well as an effective stalling of diffusion visible as a plateau in the mean squared displacement. We also investigate the corresponding first passage and first return problems.Comment: 26 pages, 5 figure

High urinary tungsten concentration is associated with stroke in the National Health and Nutrition Examination Survey 1999-2010.

Published onlineClinical TrialMulticenter StudyResearch Support, Non-U.S. Gov'tBACKGROUND: In recent years there has been an exponential increase in tungsten demand, potentially increasing human exposure to the metal. Currently, the toxicology of tungsten is poorly understood, but mounting evidence suggests that both the elemental metal and its alloys have cytotoxic effects. Here, we investigate the association between tungsten and cardiovascular disease (CVD) or stroke using six waves of the National Health and Nutrition Examination Survey (NHANES). METHODS: We investigated associations using crude and adjusted logistic regression models in a cohort of 8614 adults (18-74 years) with 193 reported stroke diagnoses and 428 reported diagnoses of CVD. We also stratified our data to characterize associations in a subset of younger individuals (18-50 years). RESULTS: Elevated tungsten concentrations were strongly associated with an increase in the prevalence of stroke, independent of typical risk factors (Odds Ratio (OR): 1.66, 95% Confidence Interval (95% CI): 1.17, 2.34). The association between tungsten and stroke in the young age category was still evident (OR: 2.17, 95% CI: 1.33, 3.53). CONCLUSION: This study represents the most comprehensive analysis of the human health effects of tungsten to date. Individuals with higher urinary tungsten concentrations have double the odds of reported stroke. We hypothesize that the pathological pathway resulting from tungsten exposure may involve oxidative stress.This work was supported by funding from University of Exeter Medical School. No funding organization or sponsor played any part in the design or conduct of the study, in the analysis or interpretation of the data, or preparation, review, or approval of the manuscript. The European Centre for the Environment and Human Health (part of the University of Exeter Medical School) is supported by investment from the ERDF (European Regional Development Fund) and ESF (European Social Fund) Convergence Programmed for Cornwall and the Isles of Scilly. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript