JOURNAL OF ADVANCES IN PHYSICS https://cirworld.com/index.php/jap 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="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution License</a>, which permits unrestricted use, distribution, and reproduction in any medium, provided that the original work is properly cited.</p> editor@cirworld.com (Gurdev Singh) jap@cirworld.com (Mandip Singh) Sat, 10 Nov 2018 03:04:56 +0000 OJS 3.1.1.4 http://blogs.law.harvard.edu/tech/rss 60 Optical Absorption in Incoherent and Coherent States of a Quantum Hall System https://cirworld.com/index.php/jap/article/view/7844 <p>In connection with recent studies of extremely long-living spin-cyclotron excitations (actually magneto-excitons) in a quantum Hall electron gas, we discuss contribution to the light-absorption related to the presence of a magneto-exciton ensemble in this purely electronic system. Since the weakly interacting excitations have to obey the Bose-Einstein statistics, one can expect appearance of a coherent state in the ensemble. A comparative analysis of both incoherent and coherent cases is done. Conditions for a phase transition from the incoherent state to the coherent one are discussed.</p> Sergey Dickmann ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 https://cirworld.com/index.php/jap/article/view/7844 Sat, 10 Nov 2018 02:59:46 +0000 On The Discrete Nature of The Gravitational Force https://cirworld.com/index.php/jap/article/view/7836 <p>The standard model of particle physics has been extremely successful in unifying the strong, weak, and electromagnetic forces through the unitary product group SU(3) X SU(2) X U(1); and general relativity has been equally accurate in describing gravitation. No attempt thus far, however, has managed to incorporate general relativity into the standard model—or any other model. And while no attempt will, herein, be made to accomplish that endeavor, perhaps some of the insights will constitute a helpful step in that direction.&nbsp; In the following pages, gravitation and electromagnetism are looked at in new and different ways.</p> Dewey Lewis Boatmun ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 https://cirworld.com/index.php/jap/article/view/7836 Sat, 10 Nov 2018 03:04:23 +0000 Formation of hierarchical 2D-MoS2 nanostructures over carbon fabric as binder free electrode material for supercapacitor applications https://cirworld.com/index.php/jap/article/view/7863 <p style="margin: 8px 0px; text-align: justify; line-height: 150%; text-justify: inter-ideograph;"><span style="margin: 0px; line-height: 150%; font-family: 'Segoe UI',sans-serif; font-size: 10pt;">Carbon fabrics are the new generation promising electrode materials for super capacitors owing to their high electrical conductivity, </span><span style="background: white; margin: 0px; line-height: 150%; font-family: 'Segoe UI',sans-serif; font-size: 10pt;">high chemical stability and low thermal expansion. In this work, 2D-MoS<sub>2</sub> nanostructures have been successfully deposited over the commercially available carbon fabric by hydrothermal approach, using silicontungstic acid as an additive. </span><span style="margin: 0px; line-height: 150%; font-family: 'Segoe UI',sans-serif; font-size: 10pt;">MoS<sub>2 </sub>nanostructures – carbon fabric was<span style="background: white; margin: 0px;"> broadly characterized using XRD, FESEM and Raman Spectroscopy. XRD patterns </span>indicated that the fabricated MoS<sub>2</sub> nanoparticles can be indexed to hexagonal (2H) and rhombohedral (3R) phases. <span style="background: white; margin: 0px;">FESEM images revealed the formation of hierarchical 2D MoS<sub>2</sub> nanosheets arranged in a nanosphere like morphology over the carbon fabric. </span>The <span style="background: white; margin: 0px;">electrochemical behavior of the </span>MoS<sub>2 </sub>- carbon fabric and <span style="background: white; margin: 0px;">commercially available bare carbon fabric were studied <span style="margin: 0px;">using cyclic voltammetry analysis with different scan rates. </span></span>The MoS<sub>2</sub>-carbon fabric </span><span style="margin: 0px; line-height: 150%; font-family: 'Segoe UI',sans-serif; font-size: 10pt;">exhibited an excellent electrochemical performance with a </span><span style="margin: 0px; line-height: 150%; font-family: 'Segoe UI',sans-serif; font-size: 10pt;">specific capacitance of 441</span><span style="margin: 0px; line-height: 150%; font-family: 'Segoe UI',sans-serif; font-size: 10pt;"> F/g at a scan rate of 10mV/s. </span><span style="background: white; margin: 0px; line-height: 150%; font-family: 'Segoe UI',sans-serif; font-size: 10pt;">The good cyclic behavior with symmetric charging/discharging curves, constant specific capacitance for longer scan rates, suggesting that the MoS<sub>2</sub>- carbon fabric electrode is a potential electrode material for high power applications.</span></p> Selvaraj shanthi, Yasuhiro Hayakawa, Suru Ponnusamy, Hiroya Ikeda, Chellamuthu Muthamizhchelvan ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 https://cirworld.com/index.php/jap/article/view/7863 Tue, 04 Dec 2018 03:20:01 +0000 Unexplained temporal effects recorded by the torsind at syzygies https://cirworld.com/index.php/jap/article/view/7877 <p>Observations of the torsion balances` and the torsind`s behavior at the moments of the solar and lunar eclipses, the transit of Venus, the occultation of Venus by the Moon were performed. It is shown that in the most cases the devices reaction to these phenomena either outstripped or lagged behind the actually observed phenomenon. The statement is substantiated that the torsind reacts to non-electromagnetic radiation of an unknown nature, arising in the outer space surrounding the Earth.</p> Alexander F. Pugach ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 https://cirworld.com/index.php/jap/article/view/7877 Tue, 04 Dec 2018 03:35:32 +0000 Investigation of Microstructure and Creep Properties of Sn-xSb Solder Alloys up to Peritectic Composition https://cirworld.com/index.php/jap/article/view/7894 <p>Particle strengthening was studied in Sn-xSb (x=0.5–3.0 wt. %). Tensile deformation behavior of Sn-2.5 wt.% Sb is investigated at temperature ranging (298 - 343K) and under different constant loads ranging (5.1 - 14.0 MPa). The microstructure characteristics of the tested alloys have been obtained using x-ray diffraction. Morphological studies using optical microscope have been investigated to obtain correlation between the microstructure and mechanical behavior of the alloys. The improved strength is attributed to the uniform distribution of the SnSb intermetallic compound (IMC) inside b-Sn matrix. Based on the obtained stress exponent (n) and activation energy (Q), it is proposed that the dominant deformation mechanism is dislocation climb over the whole temperature range used.</p> Amal Mohamed Yassin, Berlent Khalifa, Reda Ismail ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 https://cirworld.com/index.php/jap/article/view/7894 Tue, 04 Dec 2018 00:00:00 +0000 Characterization and Optical Properties of MnO Doped CuO-Containing Phosphate Glass as Absorption Filters https://cirworld.com/index.php/jap/article/view/7923 <p>In order to demonstrate the intrinsic and extrinsic changes induced by MnO in the phosphate glass network, a glass system of composition 44P<sub>2</sub>O<sub>5</sub>-38ZnO-2CuO-(16-<em>x</em>)Na<sub>2</sub>O-<em>x</em>MnO (where, <em>x</em> = 1, 2, 3, 4, and 5 mol%) was prepared using the conventional melt quenching technique. XRD patterns confirmed the non-crystalline nature of the prepared samples. The density and molar volume as a function of MnO content were determined to characterize structure of the obtained glasses. The optical spectroscopic studies of the prepared samples were carried out over (190-1000 nm) spectral range. The prepared samples were found to behave as bandpass filters in the visible region of spectrum. The UV cutoff wavelength was shifted from 308 nm to 352 nm by increasing content of MnO which is very useful in the optical technology requirements such as ultraviolet preventing applications and the protection from UV-LASER. The optical band gap was decreased by increasing content of MnO whilst, the Urbach energy was increased. The decrease in optical band gap was attributed to the progressive increase in non-bridging oxygens (NBOs) concentration with the addition of MnO. The refractive index was found to be enhanced with the addition of MnO by the effect of increase in overall polarizability. However, the optical polarizability was found to be correlated to the chemical composition of the glass. The results reveal the role of MnO as a network modifier in the phosphate glass matrix.</p> Hytham Ahmed Abd El-Ghany ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 https://cirworld.com/index.php/jap/article/view/7923 Tue, 04 Dec 2018 04:31:52 +0000