Re-Scaling of Energy in the Stringy Charged Black Hole Solutions using Approximate Symmetries

This paper is devoted to study the energy problem in general relativity using approximate Lie symmetry methods for differential equations. We evaluate second-order approximate symmetries of the geodesic equations for the stringy charged black hole solutions. It is concluded that energy must be re-scaled by some factor in the second-order approximation.Comment: 18 pages, accepted for publication in Canadian J. Physic

COVID-19 vaccines: the dilemma when thinking as a patient

What is the truth about the conspiracy theory of the COVID-19 microchip vaccine? The outbreak of the COVID-19 witnessed a vicious race of pharmaceutical firms to develop a vaccine that ends this disaster. Claims were forwarded that some firms funded by well-known foundations are in the process of developing such a vaccine so people wide world can be tracked. Such claims may have been based on Mr. Bill Gate’s announcement in an interview that through vaccination "we will have some digital certificates" which would be used to show who had recovered, been tested and ultimately who received a vaccine but he made no mention of microchips.  The conspiracy theory is spreading around the world and its supporters are on the increase among the public as well as many healthcare professionals. The spread of the virus has been attributed to the introduction of 5G technology and many religious leaders attributed the crisis to punishment from God to the spread of local wars and mass killing, torturing and killing of Muslims in China and Myanmar gay and lesbian movement and marriages

Phantom Energy Accretion by Stringy Charged Black Hole

We investigate the dynamical behavior of phantom energy near stringy magnetically charged black hole. For this purpose, we derive equations of motion for steady-state spherically symmetric flow of phantom energy onto the stringy magnetically charged black hole. It is found that phantom energy accreting onto black hole decreases its mass. Further, the location of critical points of accretion is explored, which yields mass to charge ratio. This ratio implies that accretion process cannot transform a black hole into an extremal black hole or a naked singularity, hence cosmic censorship hypothesis remains valid here.Comment: 7 pages, no figur

The Energy of Regular Black Hole in General Relativity Coupled to Nonlinear Electrodynamics

According to the Einstein, Weinberg, and M{\o}ller energy-momentum complexes, we evaluate the energy distribution of the singularity-free solution of the Einstein field equations coupled to a suitable nonlinear electrodynamics suggested by Ay\'{o}n-Beato and Garc\'{i}a. The results show that the energy associated with the definitions of Einstein and Weinberg are the same, but M{\o}ller not. Using the power series expansion, we find out that the first two terms in the expression are the same as the energy distributions of the Reissner-Nordstr\"{o}m solution, and the third term could be used to survey the factualness between numerous solutions of the Einstein field eqautions coupled to a nonlinear electrodynamics.Comment: 11 page

One-pot synthesis of 5-amino-2,5-dihydro-1-benzoxepines: access to pharmacologically active heterocyclic scaffolds

A one-pot multibond-forming process involving a thermally mediated Overman rearrangement and a ring closing metathesis reaction of allylic trichloroacetimidates bearing a 2-allyloxyaryl group has been developed for the synthesis of 5-amino-substituted 2,5-dihydro-1-benzoxepines. Chemoselective reduction and functionalization of these compounds allowed access to a range of pharmacologically active 5-amino-2,3,4,5-tetrahydro-1-benzoxepine scaffolds

Energy Contents of Some Well-Known Solutions in Teleparallel Gravity

In the context of teleparallel equivalent to General Relativity, we study energy and its relevant quantities for some well-known black hole solutions. For this purpose, we use the Hamiltonian approach which gives reasonable and interesting results. We find that our results of energy exactly coincide with several prescriptions in General Relativity. This supports the claim that different energy-momentum prescriptions can give identical results for a given spacetime. We also evaluate energy-momentum flux of these solutions.Comment: 16 pages, accepted for publication in Astrophys. Space Sc

Gravitational Collapse: Expanding and Collapsing Regions

We investigate the expanding and collapsing regions by taking two well-known spherically symmetric spacetimes. For this purpose, the general formalism is developed by using Israel junction conditions for arbitrary spacetimes. This has been used to obtain the surface energy density and the tangential pressure. The minimal pressure provides the gateway to explore the expanding and collapsing regions. We take Minkowski and Kantowski-Sachs spacetimes and use the general formulation to investigate the expanding and collapsing regions of the shell.Comment: 12 pages, 4 figures, accepted for publication in Gen. Relativ. Gra

A Spot of Bother – Orthodontic Associated White Spot Lesions

White spot lesions (WSL) are a commonly reported risk of fixed appliance orthodontic treatment. This article reviews the incidence, aetiology and effectiveness of prevention and management of WSLs with a relevant case report. An adolescent male had fixed-appliance treatment and developed WSLs, despite prevention advice and careful monitoring, the WSLs progressed and ultimately led to the need for early removal of his orthodontic appliances. Removal of appliances prevented further damage and allowed partial resolution of the WSLs. CPD/Clinical Relevance: Careful monitoring of a patient's dental health during orthodontic treatment is essential; however, if oral health deteriorates, and demineralization occurs, rapid decisive action is necessary to limit irreversible damage

Energy and Momentum of a Class of Rotating Gravitational Waves

We calculate energy and momentum for a class of cylindrical rotating gravitational waves using Einstein and Papapetrou's prescriptions. It is shown that the results obtained are reduced to the special case of the cylindrical gravitational waves already available in the literature.Comment: 11 pages, no figure, Late

Evaluation of knowledge of vitamin D aspects among pharmacy and engineering students in University of Sharjah, United Arab Emirates

Background: Vitamin D plays a major role in health. Several health disorders have been associated with its deficiency. The objectives of this study were to evaluate the knowledge of and attitude towards vitamin D of pharmacy and engineering students in the University of Sharjah, United Arab Emirates.Methods: A descriptive cross-sectional study was conducted during February-April, 2018. A 30 questions survey in English was designed, pre-validated and distributed to 250 students. The questionnaire was designed to evaluate and compare student’s knowledge and awareness of vitamin D.Results: 213 participants completed the survey producing a response rate of 85.2%. The majority of students were Arabs, females and of age ranging 21-23 years. Almost all pharmacy students were familiar with many aspects of vitamin D. Unlike engineering (66; 66.6%), most (113; 99.1%) pharmacy students know the meaning of osteoporosis. Knowledge of pharmacy students on vitamin D was generally better than that of engineering students particularly with questions on technical parameters of vitamin D levels and dosage. Students who took vitamin D test were advised by a physician. Most of the students from both colleges have a positive attitude to receive information on vitamin D through brochures, lectures/seminars and workshops.Conclusions: Awareness of non-health sciences and to some extent of pharmacy students seems to be inadequate and efforts are needed to increase awareness of the public in general of the importance of vitamin to health status