JOURNAL OF ADVANCES IN PHYSICS Interested in submitting to this journal? We recommend that you review About the Journal page for the journal's section policies, as well as the Author Guidelines. Authors need to register with the journal prior to submitting or, if already registered, can simply log in and begin the five-step process. en-US <p>Authors retain the copyright of their manuscripts, and all Open Access articles are distributed under the terms of the&nbsp;<a href="">Creative Commons Attribution License</a>, which permits unrestricted use, distribution, and reproduction in any medium, provided that the original work is properly cited.</p> (Gurdev Singh) (Mandip Singh) Tue, 25 Sep 2018 08:33:44 +0000 OJS 60 Synthesis, Structure and Magnetic Characterization of Orthoferrite LaFeO3 Nanoparticles <p>Single-phase lanthanum orthoferrite (LaFeO<sub>3</sub>) was prepared by an auto-combustion method. The analysis of synchrotron room temperature X-ray diffraction (XRD) data confirmed the orthorhombic LaFeO<sub>3</sub> perovskite of space group&nbsp;Pnma&nbsp;without any impurity phase. The Scherrer's formula and Williamson-Hall plot based on XRD data were employed to estimate the crystallite size of the prepared sample. For a deeper insight into the crystal structure, high-resolution transmission microscopy imaging (HRTEM) was performed. The estimated values of crystallite size from HRTEM and synchrotron XRD data were coincident. The HRTEM images confirmed the polycrystalline nature of the prepared sample through the obvious lattice planes which are related to (121) plane. Furthermore, the M(H) hysteresis loop of the investigated sample was characterized by a vibrating sample magnetometer (VSM). The magnetic properties obtained through analyzing the magnetization versus temperature M(T) and magnetization versus magnetic field M(H) curves indicated that LaFeO<sub>3</sub> possessed weak ferromagnetism at room temperature.</p> Yehia Mohammed Abbas, Ahmed Bakry Mansour, Shehab Esmail Mohammed Ali, Ahmed Hassan Ibrahim Abdel-Hamid ##submission.copyrightStatement## Tue, 25 Sep 2018 08:30:42 +0000 Enrichment of Poly Vinyl Chloride (PVC) Biological Uses Through Sodium Chloride Filler, Density Functional Theory (DFT) Supported Experimental Study <p>Samples of pristine poly vinyl chloride (PVC) and other samples of the same matrix containing a variable amount of inorganic sodium salt (sodium chloride NaCl) were prepared via simple casting route in a dimethyl sulfoxide (DMSO) solvent were prepared. Prepared samples were characterized via x-ray diffraction (XRD) measurements and Fourier transform infrared spectrophotometric measurements (FTIR) in combination with computational density functional theory approaches (DFT) into account for a detailed picture of the possible reaction mechanisms within the polymeric matrices. All measurements were performed on the possible basis set. Local density approximate (LDA) and generalized Goertzel algorithm (GGA) was also tested. A compatibility between computed and experimental results suggested that physical interaction was preferred in such matrix and nominate use of this new material to be used in the medical field as a result of dioxin illumination.</p> A. M. Abdelghany, M S Meikhail, R Hamdy ##submission.copyrightStatement## Tue, 25 Sep 2018 08:29:29 +0000 The Mularz Paradox—Relativistic Discrepancies in The Resistivity of Cylindrical Electrical Conductors Travelling at Near Light-Speed—A Thought Experiment <p>Most of us are familiar with Einstein’s now-famous relativistic thought experiments—his stationary-versus-moving ‘light clock’ and the interstellar twin astronauts aging at different rates especially stand out.<sup>[1]</sup>&nbsp; In this simple thought experiment the author wishes to propose a heretofore unrecognized set of relativity paradoxes involving the predicted electrical resistivity of long cylindrical conductors when moving at or near light-speed.</p> Stephen Mularz ##submission.copyrightStatement## Mon, 01 Oct 2018 09:18:18 +0000 Assessment of The Annual Effective Dose of Bottled Mineral Waters Using Closed Can Technique <p>Water is the most important substance for life. Mineral waters are widely used as drinking water, and so that, it is important to determine the radon levels, and its risk in drinking water for public health and radiation protection. Radon concentration has been measured in the bottled natural mineral water samples commercially available in the Egyptian local market, using closed can technique. Radon concentration in water samples ranged from 0.93 - 6.89 Bql<sup>-1</sup> and total annual effective dose ranged from 3.49 - 25.93 µSvy<sup>-1</sup>. The results indicate that radon concentrations in water samples lower than the recommended limit 11.1BqL<sup>-1</sup> by EPA, and the annual effective dose of the samples are lower than the permissible international limit by EPA and WHO. The obtained results indicate that there is no significant public radiological risk related to radon ingested with drinking water in the present study. &nbsp;</p> Hesham A. Yousef ##submission.copyrightStatement## Mon, 01 Oct 2018 09:21:01 +0000 Deterministic Mechanism of Irreversibility <p>The analytical review of the papers devoted to the deterministic mechanism of irreversibility (DMI) is presented. The history of solving of the irreversibility problem is briefly described. It is shown, how the DMI was found basing on the motion equation for a structured body. The structured body was given by a set of potentially interacting material points. The taking into account of the body’s structure led to the possibility of describing dissipative processes. This possibility caused by the transformation of the body’s motion energy into internal energy. It is shown, that the condition of holonomic constraints, which used for obtaining of the canonical formalisms of classical mechanics, is excluding the DMI in Hamiltonian systems. The concepts of D-entropy and evolutionary non-linearity are discussed. The connection between thermodynamics and the laws of classical mechanics is shown. Extended forms of the Lagrange, Hamilton, Liouville, and Schrödinger equations, which describe dissipative processes, are presented.</p> Vyacheslav Michailovich Somsikov ##submission.copyrightStatement## Wed, 03 Oct 2018 03:01:16 +0000 Influence of Alloying Additives on The Adhesive Properties of Steels: Atomic Level Simulation <p>In the present work we report atomistic molecular dynamics simulation results on adhesion force between self-mated iron/iron, iron/vanadium, iron-cementite and iron/titanium surfaces has been determined and we found that iron/cementite surface exhibits lower adhesive force than that of iron/iron surface. The results showed that adhesion, quantified by the work of adhesion, decreased as the vanadium content increased and highest reduction was obtained for 10 at.% vanadium and&nbsp; 7.5 at.% for titanium. Furthermore, the variation of adhesion force with temperature was studied in the temperature range between 300-700 K and we found that the adhesive force generally is lowered at higher temperature.</p> Ahmed Tamer AlMotasem ##submission.copyrightStatement## Wed, 03 Oct 2018 03:02:37 +0000 Study The Properties of Sintered Al-Composites Matrix Reinforced With Nano-Al Oxide And/Or Carbon Nano Tubes <p>The present work is concerned with studying the synthesis and characterization of hybrid aluminum bronze matrix strengthened with nano-aluminum oxide particles (n-Al<sub>2</sub>O<sub>3</sub>), and carbon nano tubes (CNTs). The selected matrix composite was successfully incorporated with different weighted percentages of CNTs (i.e. 1.0 and 2.0 wt.%) and/or n-Al<sub>2</sub>O<sub>3</sub> (i.e. 1.0 and 2.0 wt.%) by sintering process. From the microstructure analysis, n- Al2O3 particles was dispersed uniformly and holding over the surface of aluminum bronze. Furthermore, some agglomeration was found due to reinforced CNTs into aluminum bronze matrix. From hardness tests, it was found that incorporated n- Al<sub>2</sub>O<sub>3</sub> and CNTs into matrix increased the hardness of composites to be equal 230 HV, which is around 2.3 times higher than that of an aluminum bronze matrix. Moreover, the wear loss of CNTs - Al<sub>2</sub>O<sub>3</sub>/aluminum bronze composites diminished because of the impact of homogeneous circulation of CNTs in aluminum bronze and low corrosion coef?cient of uncovered CNTs on the well-used surface. Notable from the results, the electrical resistivity of the hybrid composites are lower than the matrix. Hopefully, the findings are expected to provide profound knowledge and further reference towards the studied composites of the miniaturised electronic package</p> A. E. Hammad, Yasser M. R. AboelMagd ##submission.copyrightStatement## Wed, 03 Oct 2018 03:04:39 +0000 Preparation and Characterization of Polyacrylamide – Silver Nanocomposite <p>The preparation of polyacrylamide (PAAM)/silver (Ag) nanocomposites, transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and vibrational structure were studied in this work. TEM results showed that the Ag particles were in sphere shape with 12 nm and 13 nm diameter. The X-ray diffraction results showed that, silver nanoparticles are present in the prepared nanocomposites 10 nm and 11 nm. The vibrational modes were analyzed by FTIR spectroscopy.</p> Samira Ahmed ##submission.copyrightStatement## Wed, 03 Oct 2018 03:06:04 +0000 Physical Mathematics and The Fine-Structure Constant <div class="standard"><a id="magicparlabel-164"></a>Research into ancient physical structures, some having been known as the seven wonders of the ancient world, inspired new developments in the early history of mathematics. At the other end of this spectrum of inquiry the research is concerned with the minimum of observations from physical data as exemplified by Eddington's Principle. Current discussions of the interplay between physics and mathematics revive some of this early history of mathematics and offer insight into the fine-structure constant. Arthur Eddington's work leads to a new calculation of the inverse fine-structure constant giving the same approximate value as ancient geometry combined with the golden ratio structure of the hydrogen atom. The hyperbolic function suggested by Alfred Landé leads to another result, involving the Laplace limit of Kepler's equation, with the same approximate value and related to the aforementioned results. The accuracy of these results are consistent with the standard reference. Relationships between the four fundamental coupling constants are also found.</div> Michael A. Sherbon ##submission.copyrightStatement## Wed, 03 Oct 2018 00:00:00 +0000 Theory of The Three Fields of Space <ol> <li>This article is a logical and rational analysis of the physical phenomena produced by the three fields that are generated in space: gravity field; field of terrestrial nuclear magnetism; and orbital field.</li> <li>Eduardo Guimarães, through the studies of the three nuclear masses of the Sun's nucleus, the three nuclear masses of the moon's nucleus, and the three nuclear masses of the Earth's nucleus.</li> <li>We discover the three spatial fields that are generated in the solar system and in the planets.</li> <li>Then, from the general theory of the three fields of space, we can understand all the mechanics that generate the dynamics and kinematics of celestial bodies.</li> <li>So now we can understand why the smaller celestial bodies orbit the orbital field of the largest celestial bodies.</li> <li>So now we can understand why the planets produce orbits of elliptical motions, around the orbital field of the Sun.</li> <li>Then we understand the orbital mechanics of the little planet Mercury, and its abnormal orbit around the orbiting field of the Sun.</li> <li>Then Mercury has a perihelion precession of 2 degrees per century, due to an approximation of the perihelion of Mercury which is attracted by the micro-gravity of the Sun, generating an orbital deviation of 2 degrees per century.</li> <li>In the future the planet Mercury will lose energy from its nucleus and will not be able to make the orbital curve of the perihelion because it will have been attracted by the gravitational field of the Sun's nucleus.</li> <li>The fall of Mercury on the Sun will generate two thermonuclear explosions of SUPERNOVA.</li> <li>The first thermonuclear explosion of SUPERNOVA will be generated by the thermonuclear collision of the gravity mass attraction of Mercury debris with the Sun's nucleus.</li> <li>The second thermonuclear explosion of SUPERNOVA will be generated by the thermonuclear collision of attraction of the mass of orbital attraction of Mercury debris with the nucleus of the Sun.</li> <li>These two thermonuclear explosions of SUPERNOVA will generate two immense thermonuclear shockwaves that will devastate the entire fragile geo-biome of the solar system.</li> </ol> <p>&nbsp;</p> Eduardo S. Guimaraes ##submission.copyrightStatement## Wed, 03 Oct 2018 03:09:57 +0000 Introduction to The Spiral Dynamics and The Spiral Coriolis Force <p>The spiral dynamics of a point-like body of mass m in spiral differential geometry are introduced. New ideal motions have been studied, the uniform spiral motion and the uniform spiral-polar motion. The analysis is proposed by comparing the ideal spiral motions with the ideal circular motions. The theoretical forces acting on a point-like body of mass m moving in spiral frames were analyzed. The spiral and polar components of the Coriolis forces were compared.</p> Italo Mario Fabbri ##submission.copyrightStatement## Fri, 05 Oct 2018 03:38:35 +0000