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Editorial, Volume 5 (2019)
Get PDFOn behalf of the Editorial Board, it is with great pride and sincere privilege that I am writing this message to present the volume 5 (2019) of the Computer Reviews Journal. The issue comes from a long process, and we took all the necessary steps to make it a high-caliber scientific publication. We are relying on the collaboration of all our Editors, reviewers, and contributors to make it a contemporary, lively, and relevant publication
Geophysical Contribution of Using 3D View in Landfill Site
Get PDFGeophysical techniques are very useful tools in the characterization of the subsurface to determine the degree of conductivity and predict the nature of earth materials present within the survey area. Three 2D electrical resistivity profiles were established for the purpose of this research. The field survey was carried out using Dipole-dipole array with a spread of 164 m at the only State government approved landfill site in Ikpoba Okhia local government area, Benin City, Edo State. The 3D image maps were at three different depth slices of (5 m, 18 m and 38 m) in order to determine the rate of spread and migration of leachate as we probed deeper into the subsurface. The apparent resistivity values helped in identifying the nature, lateral spread and depth of the conductive sources in the study area. The resistivity data were imported into Voxler software to achieve the objective of the study. The image results from the electrical resistivity tomography (ERT) method revealed highly conductive zones with conductivity of less than 226 Ωm and above to the depth of 38 m. The images show subsurface resistivity distribution at the Eastern part of the study area trending Eastward with prominence at the center and distributed North - East which has been interpreted as loosed or migration zones of leachate. The depth estimate revealed lateral spread of leachate from the surface to maximum depth (38 m) probed which agrees with the borehole lithology of probable materials present within the study area. The study has revealed that the area is generally highly conductive due to the presences of toxic elements while the loosed zones are prospective locations for infiltration of contaminant plums (leachate) from the 3D model view
Wormholes in k(R,T) Gravity: Wormholes
No full textThe wormhole solution could be found by solving the Einstein field equations with violating the null energy condition (NEC). We represent wormhole solutions in gravity (Teruel , 2017) in two different ways. At first we find the shape function by considering a redshift function and linear equation of state (EoS). The solution represents a wormhole for the real feasible matter. In second part we consider two pairs of redshift and shape functions and analyze the obtained solutions. Some of the models suggest that for particular values of the parameters, the existence of wormholes are supported by arbitrarily small quantity of exotic matter
Fractal Analysis of the Lunar Free-air Gravity Field
Get PDFRecent dedicated lunar gravity mission- Gravity Recovery and Interior Laboratory (GRAIL) provided high-resolution gravity field data for the Moon. The collected data are the starting material for the construction of the latest gravity model GRGM1200A, up to a degree and order 1200° and with sensitivity down to <5 km resolution. This article present the results of the study of the probable fractal structure of the lunar “free-air” gravity field, based on this data. The "free-air" gravity disturbances are the gravity perturbations computed at the reference radius of 1738 km. They show the gravity variations as measured by the spacecraft, and thus include contributions from both the surface topography and any sub-surface bodies. The results would throw a new light on the nature of the geophysical processes and phenomena that take place on the Moon
Ion Acoustic Shock Waves in a Six Component Cometary Plasma
Get PDFThe effect of pair ions on the formation and propagation characteristics of Ion-Acoustic (IA) shock waves in a six-component cometary plasma composed of two hot and one colder electron component, hot ions, and heavier pair ions is studied. The colder and one hotter component of electrons together with the lighter hydrogen ions are modelled by kappa distributions. The other hotter electron component is described by a q-nonextensive distribution. The KdVB equation is derived for the system and its solution plotted for different kappa values, oxygen ion densities, kinematic viscosities as well as the temperature ratios of ions. In the aforesaid plasma, the shock wave exhibits a transition towards solitary structure. It is found that the strength of shock profile decreases with an increase in both temperatures of the positively charged oxygen ions and negatively charged oxygen ion densities. However, the strength of the shock wave decreases with a decrease of positively charged oxygen ion densities
Augmented Reality and Virtual Reality Web Environment to Visualizing the Planets of The Solar System
Get PDFThis paper shows the development of a webpage environment created to visualizations of the Solar System planets with Augmented Reality and Virtual Reality. With the objective to show the Solar System closer to reality, the measurements used in this paper involve distances between the planets and the Sun, limits of minimum (perihelion) and maximum distances (aphelion), rotations, inclinations and eccentricities of the elliptical orbits. To improve the orbits visualization, distances, diameters and rotations metrics were adapted with proportional circles areas and geometrical mean, smoothing the differences of magnitudes. The developed environment can be used in the classroom to visualize the Solar System in Augmented Reality, with the possibility of manipulations of the planets representations by the students with the environment created in Virtual Reality, besides studies of the laws of Kepler and properties of inclinations and rotations of the planets. This work serves as a way to encourage teachers to develop materials with the technology shown in order to propagate and popularize the use of Augmented Reality and Virtual Reality in classroom programmed as in a web environment
Conformable Derivative and Fractal Derivative of Functions on the Interval [0,1]
Get PDFRecently, a calculus-based fractal, called Fα-calculus, has been developed which involve Fα-integral, conjugate to the Riemann integral, and Fα-derivative, conjugate to ordinary derivative, of orders α, 0< α <1, where α is the dimension of F. In F α-calculus the staircase function has a special role. In this paper we obtain fractal Taylor series for fractal elementary functions, sine, cosine, exponential function, etc. and then we compare the graph of these fractal functions with their counterparts in standard calculus on the interval [0,1]. Then, the main part of the paper is discussed about the transition from continuous state to a discrete state when we do fractal differentiation in which characteristic function χC(x) appears. Since Fα-derivative is local, we compare it with a conformable derivative which is also local. Moreover, fractal differential equations for fractal sine, cosine, sine hyperbolic, cosine hyperbolic and exponential functions are deduced. We also represent Pythagorean trigonometric identity for sin and cosine, and hyperbolic sine and hyperbolic cosine in F α-calculus, respectivel
Editorial, Volume 4 (2019)
Get PDFOn behalf of the Editorial Board, it is with great pride and sincere privilege that I am writing this message to present the volume 4 (2019) of the To Physics Journal. The issue comes from a long process, and we took all the necessary steps to make it a high-caliber scientific publication. We are relying on the collaboration of all our Editors, reviewers, and contributors to make it a contemporary, lively, and relevant publication
Application of Stabilized Cefixime-AgNPs-GO Thin Films as Corrosion Inhibitors for Mild Steel Alloy
Get PDFIn this work, the corrosion inhibition of mild steel at ambient conditions by an antibiotic in a solution that contains silver nanoparticles (AgNPs) and graphene oxide (GO) was studied. GO and AGNPs were prepared by one-step simple and ecofriendly method and characterized by different techniques. Different concentrations of the inhibitor were prepared and their inhibition efficiency in acidic media was investigated. The adsorption characteristics of the inhibitor were studied and it was found that the antibiotic (Cefixime) alone and with GO combined with AgNPs inhibit the corrosion of mild steel by being adsorbed on the surface of mild steel by a physical adsorption mechanism. The adsorption of Cefixime and GO with AgNPs on the mild steel surface was found to be spontaneous. Incorporating AgNPs and GO with Cefixime showed an additional inhibition efficiency when compared with using only Cefixime. This indicates the strong inhibition efficiency offered by incorporating the antibiotic with AgNPs and GO
