for Journals by Title or ISSN
for Articles by Keywords
help

Publisher: Horizon Research Publishing   (Total: 54 journals)   [Sort by number of followers]

Showing 1 - 54 of 54 Journals sorted alphabetically
Advances in Diabetes and Metabolism     Open Access   (Followers: 16)
Advances in Economics and Business     Open Access   (Followers: 11)
Advances in Energy and Power     Open Access   (Followers: 12)
Advances in Pharmacology and Pharmacy     Open Access   (Followers: 7)
Advances in Signal Processing     Open Access   (Followers: 11)
Advances in Zoology and Botany     Open Access  
Bioengineering and Bioscience     Open Access   (Followers: 1)
Cancer and Oncology Research     Open Access   (Followers: 8)
Chemical and Materials Engineering     Open Access   (Followers: 13)
Civil Engineering and Architecture     Open Access   (Followers: 18)
Computational Research     Open Access   (Followers: 1)
Computer Science and Information Technology     Open Access   (Followers: 13)
Energy and Environmental Engineering     Open Access   (Followers: 7)
Environment and Ecology Research     Open Access   (Followers: 7)
Food Science and Technology     Open Access   (Followers: 3, SJR: 0.11, h-index: 6)
Immunology and Infectious Diseases     Open Access   (Followers: 9)
Intl. J. of Biochemistry and Biophysics     Open Access   (Followers: 1)
Intl. J. of Cardiovascular and Cerebrovascular Disease     Open Access   (Followers: 2)
Intl. J. of Neuroscience and Behavioral Science     Open Access   (Followers: 1)
Linguistics and Literature Studies     Open Access   (Followers: 4)
Manufacturing Science and Technology     Open Access   (Followers: 2)
Mathematics and Statistics     Open Access   (Followers: 5)
Nanoscience and Nanoengineering     Open Access   (Followers: 1)
Natural Resources and Conservation     Open Access   (Followers: 6)
Nursing and Health     Open Access   (Followers: 3)
Open J. of Dentistry and Oral Medicine     Open Access  
Sociology and Anthropology     Open Access   (Followers: 5)
Sport and Art     Open Access   (Followers: 1)
Universal J. of Accounting and Finance     Open Access   (Followers: 2)
Universal J. of Agricultural Research     Open Access   (Followers: 1)
Universal J. of Applied Mathematics     Open Access   (Followers: 5)
Universal J. of Applied Science     Open Access   (Followers: 2)
Universal J. of Biomedical Engineering     Open Access  
Universal J. of Chemistry     Open Access  
Universal J. of Clinical Medicine     Open Access  
Universal J. of Communications and Network     Open Access  
Universal J. of Computational Mathematics     Open Access   (Followers: 4)
Universal J. of Control and Automation     Open Access   (Followers: 3)
Universal J. of Educational Research     Open Access  
Universal J. of Electrical and Electronic Engineering     Open Access   (Followers: 6)
Universal J. of Engineering Science     Open Access   (Followers: 1)
Universal J. of Food and Nutrition Science     Open Access   (Followers: 5)
Universal J. of Geoscience     Open Access   (Followers: 3)
Universal J. of Industrial and Business Management     Open Access   (Followers: 1)
Universal J. of Management     Open Access  
Universal J. of Materials Science     Open Access   (Followers: 3)
Universal J. of Mechanical Engineering     Open Access   (Followers: 10)
Universal J. of Medical Science     Open Access  
Universal J. of Microbiology Research     Open Access  
Universal J. of Physics and Application     Open Access   (Followers: 2)
Universal J. of Plant Science     Open Access  
Universal J. of Psychology     Open Access   (Followers: 2)
Universal J. of Public Health     Open Access   (Followers: 2)
World J. of Computer Application and Technology     Open Access   (Followers: 3)
Journal Cover Universal Journal of Physics and Application
  [2 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 2331-6535 - ISSN (Online) 2331-6543
   Published by Horizon Research Publishing Homepage  [54 journals]
  • Gamma Ray Shielding and Structural Properties of Bi2O3-B2O3-Na2WO4 Glass
           System

    • Abstract: Publication date:  Oct 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  5  Mridula Dogra   K.J. Singh   Kulwinder Kaur   Vikas Anand   and Parminder Kaur   Gamma ray sources and radioactive materials in several sectors including nuclear power plants, nuclear reactors, nuclear medicine, agriculture and industry have harmful effects on humans and it is essential to provide shield against gamma radiations. Gamma radiations are highly penetrating electromagnetic radiations in the environment. The present work is aimed at exploring new glass composition for gamma ray shielding applications. Gamma ray shielding properties of the composition x Bi2O3-0.6 B2O3-(0.4 - x)Na2WO4.2H2O where x = 0.1 to 0.3 (in mole fraction) have been studied by calculating mass attenuation coefficients and half value layer parameters at photon energies 662, 1173 and 1332 keV using XCOM computer software developed by National Institute of Standards and Technology. Higher values of mass attenuation coefficients and lower values of HVL than barite concrete indicate the glass system as better gamma radiation shield. Density, molar volume, XRD and UV-Visible studies have been performed to study the structural properties of the prepared glass system. From the analysis of obtained results, it is reported that density of the prepared glass samples increases with the content of heavy metal oxide Bi2O3. XRD studies confirm the amorphous nature of the glass composition. It has been concluded that bismuth borate tungstate glasses are better shields for γ-radiations in comparison to the standard nuclear radiation shielding concretes and commercially available glasses.
      PubDate: Oct 2017
       
  • A New Model of the Birth of the Universe

    • Abstract: Publication date:  Oct 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  5  Alexey Belyaev   This paper studies the principles laid in existing models and the approaches to building new models and shown that the existing models of the birth of the Universe not only require an introduction of a new category "dark energy" to explain the accelerated dispersion of matter but that they do not fulfill Hubble's law, which was a necessary before the discovery of the accelerated expansion of the Universe. It is found a new cosmological model could be built and the principles are studied with which the new model of the birth of the Universe must comply.
      PubDate: Oct 2017
       
  • Development of a Free Space, LED Illuminated Spectral-domain Optical
           Coherence Tomography Setup

    • Abstract: Publication date:  Oct 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  5  Nyasha J. Suliali   Peter Baricholo   Pieter H. Neethling   and Erich G. Rohwer   Free-space spectral domain optical coherence tomography has been demonstrated using an 8 mW ultra-bright 850 nm light-emitting diode with a 40 nm spectral width. The system detects longitudinal reflectivity of surface and sub-surface layers of optical elements to depths of a millimetre with high fidelity. Development stages included mathematical analysis of light interference by superposition of electric field phasors of reference and sample arms of a Michelson interferometer. A method by which depth-resolved reflectivity is acquired is described. A locally assembled Czerny Turner monochromator was aligned such that the interferometer output beam is dispersed into its spectral components before image re-construction. Calibration of the 2048-pixel detecting charge-coupled device line camera was performed using a Mercury vapour lamp with 8 spectral lines spanning from the ultra-violet to yellow region of the electromagnetic spectrum. Processing of interference fringe signals from spectral domain data is described and an analysis of variations in frequency of the interference fringe signal and threshold illumination with depth into the sample presented. A test of sensitivity of the depth imaging algorithm to low-amplitude signals is also reported.
      PubDate: Oct 2017
       
  • The Method of Interacting Configurations in Complex Number
           Representations: From Helium to the Complex Atoms

    • Abstract: Publication date:  Oct 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  5  V.M. Simulik   R.V. Tymchyk   and T.M. Zajac   The transition from the He atom to the complex atoms description in the method of interacting configurations in the complex number representation has been presented. As a first step the problem of ionization of H- and Li+ ions is considered. The spectroscopic characteristics of the Be, Mg and Ca atoms in the problem of the electron-impact ionization of these atoms are investigated. Few results in the photoionization problem on the 1P autoionizing states above the n=2 threshold of helium-like Be++ ion are presented. The energies and the widths of the lowest 1S; 1P; 1D; and 1F autoionizing states of the Be, Mg atoms, and the lowest (1P) autoionizing states of Ca atom, are calculated. We consider briefly both a review of our previous results (together with results of other authors) and new calculations of our group. A brief review of the methods of the quasi-stationary states calculation is given.
      PubDate: Oct 2017
       
  • Collective Phenomena in Heavy Ion Collisions

    • Abstract: Publication date:  Oct 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  5  Slavica Brkić   and Mile Dželalija   To create conditions which ruled one billionth of a second after the Big Bang, it is necessary to heat and compact the nuclear matter. During the first microseconds after the Big Bang the universe went through such a phase transition at very high temperatures but very low net baryon density. At very high temperatures or densities, the hadrons melt and their constituents, the quarks and gluons, form a new phase of matter, the so called quark-gluon plasma. Relativistic heavy ion collisions aim to create a quark gluon plasma where quarks and gluons can move freely over volumes that are large in comparison to the typical size of a hadron. When the particles collide at high energies, it leads to the conversion of particle collision participants in a much heavier particle. If the energy density is large enough, after a collision occurs the formation of quark-gluon plasma. In the dense nuclear medium, it comes to collective phenomena such as increased production of strangeness, damping charmonium and collective motion of particles. In nuclear medium, it comes to individual collision of quarks, which also hadronize. Using simulation package Pythia, we analyzed the reaction system that results in individual collisions of quarks and antiquarks, and emergence of collective phenomena.
      PubDate: Oct 2017
       
  • On the Possibility of Primordial Torsion Detection from Magnetic Helicity
           and Energy Spectra

    • Abstract: Publication date:  Oct 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  5  L.C. Garcia de Andrade   The purpose of this paper is twofold: First lending more supports to torsion alternative gravity theories to General Relativity and cosmology, and torsion detection by showing how they can simply be used in the investigation of helicity and magnetic energy spectra of primordial magnetic fields PMF) by using a strong value of torsion of 10MeV previously computed by the author. Dynamo mechanism seeds in the Primordial Universe have been a matter of intense investigation lately. The second purpose is to apply these torsion theories in the special random spins gauge where its time component torsion gauge T0 = 0. This implies that spins of the nucleons are polarised orthogonal to QCD domain walls. A modification of circular polarization at 1Mpc scale, gives rise to left torsion helicity which using a QCD seed BQCD ∼ 1016 G yields magnetic field (MF) of B_ ∼ 1030 Gauss which was the value obtained by Enqvist et al using neutrinos and galactic dynamos at QED scales. The B+ mode can be shown to constrain torsion to T ∼ 107 Mev at 1pc which can be detected at LHC scales. These constraints at 1Mpc reach only 10-10 MeV.
      PubDate: Oct 2017
       
  • Design of an Optimal High Pass Filter in Frequency - Wave Number (F-K)
           Space for Suppressing Dispersive Ground Roll Noise from Onshore Seismic
           Data

    • Abstract: Publication date:  Oct 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  5  Adizua, O. F.   Inchinbia, S.   and Ekine, A. S.   The ultimate goal in seismic signal processing (pre- processing or main processing) is to enhance the signal to noise ratio (S-N-R). In this study, two high pass (low cut frequency) filters were designed in frequency - wave number (F-K) space and applied to onshore 3D seismic data acquired from a typical Niger Delta field to suppress dispersive ground roll in a bid to enhance S-N-R. The seismic shot records were initially displayed to show the seismic data ensembles in the conventional offset - time (X-T) domain. A frequency - wave number spectrum was then created using a VISTA software algorithm to analyze the spectral patterns of the signals and noise. Two high pass filters were then designed in the F-K space to mute the low frequency ground roll from the data. The filters were then applied to the entire seismic data ensemble for the filtering operation. The results obtained after the two filtering operations were compared to ascertain the optimal filter which was most effective for the suppression of the unwanted ground roll noise.
      PubDate: Oct 2017
       
  • Challenges of Superdense Coding with Accelerated Fermions

    • Abstract: Publication date:  Oct 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  5  Mehrnoosh Farahmand   and Hosein Mohammadzadeh   Two particles, even being far from each other have quantum correlation as a result of the existence of entanglement between them. Therefore, information can be shared by entangled particles, sitting in separate places. Superdense coding is one of the quantum protocols that rely on entanglement. In this paper, we review superdense coding with a non-inertial observer in the beyond single mode approximation and investigate the probability of success for superdense coding. We analyze the mutual information due to the effects of acceleration on the quantum and classical correlations of the state. Entanglement behavior is studied considering an entanglement measure the so-called the concurrence. Comparing the mutual information and the concurrence with the probability of superdense coding is shown that quantities have different behaviors, particularly, when the beyond single mode approximation plays a powerful role.
      PubDate: Oct 2017
       
  • Optical and Electrical Properties of Antimony and Fluorine Doped Tin Oxide
           Thin Films

    • Abstract: Publication date:  Jun 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  3  Saw Lin Oo   Zayar Thu   Than Zaw Oo   and Pho Kaung   The Sb:F:SnO2 layers (AR) were prepared by spray pyrolysis method. The anti-reflective layers (AR) heat-treated at 500℃ for 30 min (solution amount 20 cc and 25 cc) have shown an improved crystallinity with crystallite size of 38-39 nm, high optical transmission of around 70 % at 450 nm. Incorporation of anti-reflective layer at cathode interface of SiO2/Si(N) devices increased the power conversion efficiency from 1.2% to 2.7% which is mainly contributed from photocurrent enhancement. The enhanced efficiency mainly contributed to the increase in Jsc. It is attributed to enhanced light absorption and better charge transport in the SiO2/Si (N) device with Sb:F:SnO2 AR layer. Results of optical and electrical studies show that the films are well suited for thin film solar cell as a window layer.
      PubDate: Jun 2017
       
  • The Total Ground State Energies and First Ionization Energies of the
           Incomplete 3d-Transition Metal-Elements Atoms

    • Abstract: Publication date:  Jun 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  3  Ebtehal M. Althobaiti   Atif Ismail   and M. Sabry   We studied the incomplete 3d-transition metal-lements, scandium through nikel, atoms and their corresponding cations by diffusion Monte Carlo (DMC) method with three different basis sets, namely VTZ_ANO, Stuttgart RSC 1997 ECP, and CRENBL ECP. Our calculations for total ground state energy and first ionization potential, agree very well with studies used LANL2DZB3LYP as basis sets, and with the experimental values of first ionization potential. Moreover, we found that the calculations with VTZ_ANO basis set are more accurate than those with the other two basis sets.
      PubDate: Jun 2017
       
  • Study on Discharge Dynamics in an Atmospheric Pressure Dielectric Barrier
           Discharge

    • Abstract: Publication date:  Jun 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  3  W.H. Tay   S.S. Kausik   S.L. Yap   and C.S. Wong   In this work, the discharge dynamics in an atmospheric pressure dielectric barrier discharge (DBD) is studied in a DBD reactor having parallel plate electrodes geometry. The DBD reactor is powered by a 50 Hz ac high voltage power source through a ballast resistor. The images of filaments occurring in the discharge gap are captured using a high speed intensified charge coupled device camera. The occurrence of frequent synchronous breakdown of micro discharges has been observed across the discharge gap when the electron avalanche happens in the direction from the dielectric surface towards the opposite electrode. The discharge gap dependence on synchronous breakdown is studied by changing the discharge gap. The shape of the filaments has been found to be strongly dependent on the direction of the electron avalanche. It is demonstrated that the diffusion of electrons occurs when the electron avalanche happens in the direction towards the dielectric from the opposite electrode. A smaller diffusion leading to narrower filaments is observed when the electron avalanche happens in the direction from the dielectric to the opposite electrode. This can be explained by the existence of memory charge on the dielectric surface.
      PubDate: Jun 2017
       
  • Industrial Use of HiPIMS up to Now and a Glance into the Future, A Review
           by a Manufacturer Introduction of the hiP-V hiPlus Technology

    • Abstract: Publication date:  Jun 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  3  Gerhard Eichenhofer   Ivan Fernandez   and Ambiörn Wennberg   It has been demonstrated by several groups that HiPIMS is a state of the art tool for applying demanding coatings with superior film properties. The real industrial breakthrough for the HiPIMS-technology has not yet happened. On the other hand, the up till now available HiPIMS-PS were mainly been up-scaled "prototypes", far away from industrial work horses. With the hiP-V HiPIMS power system, a direct derivative of a robust power supply technology already in commercial use for public transportation systems, another milestone is set to make the HiPIMS technology go mainstream. HiPIMS is not a revolution that will make all other technologies obsolete, yet it is a very powerful complement. With a reliable, multi-functional power supply and with a rapid arc-handling, it could possibly be a start of a new era in thin film production. Just consider the possibility of etching and implantation to increase cleanliness and adhesion of the samples. Until now, most of the R&D work done in HiPIMS, has been dedicated to hard coatings and tool coatings. Here, HiPIMS is surely useful but not the expected technological breakthrough. For the future, the implementation of the new pos. reverse pulse, the hiP-V hiPlus HiPIMS technology, is opening a whole new field of possible applications for i.e. nonconductive substrates where no bias can be applied. Glass and plastics can be processed with remarkable results in hardness, enhanced film properties and additionally, it is achieved at lower substrate temperatures. It has been a slow start for HiPIMS, but the future looks bright.
      PubDate: Jun 2017
       
  • From Electrojet to ITER: India's Journey in Experimental Plasma Physics

    • Abstract: Publication date:  Feb 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  1  P. I. John   India has an international presence in Plasma Physics and its diverse applications such as thermonuclear fusion, material processing, strategic and environmental applications and plasma devices. From a modest start in the early 1970s, we have made great strides in the field of experimental plasma physics. Capacity building in techniques relevant to plasma production, manipulation and parameter control, pulsed power, creation of magnetic fields of complex geometries, clean vacuum and pumping systems, development and deployment of diagnostics to enable understanding of fundamental processes in plasmas and computer simulation to model plasma phenomena have been truly remarkable. Parallel to this, a community of physicists, engineers and computer experts has grown and matured. Funding mechanisms and financial support essential to broad base the research and development activity by drawing in Universities and education institutes have been nucleated. It is through these activities that the human resource and technology development essential to sustain India's ambitious forays into magnetic confinement fusion and industrial and strategic plasma applications has taken place. This paper is an attempt to give a historical perspective to this journey, which started at the Physical Research Laboratory, Ahmedabad and later, involved the Institute for Plasma Research at Gandhinagar, many DAE Institutions, IITs and Universities.
      PubDate: Feb 2017
       
  • Renormalization the Energy of Elementary Excitations in Solids by the
           Strong (Nuclear) Interaction

    • Abstract: Publication date:  Feb 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  1  V. G. Plekhanov   The experimental evidence of renormalization the energy of the elementary excitations in solids which are differ by term of one neutron from each other by the strong (nuclear) interaction has been presented for the first time. This evidence is based on two independent results: 1) The increase exciton energy on 103 meV is caused by the adding of one neutron (using LiD crystals instead LiH ones); 2) After increasing the amounts by one neutron the energy of LO phonons has decreased by 36 meV. The last one is directly seen from luminescence and scattering spectra. As far as the gravitation, electromagnetic and weak interactions are the same in both of kind crystals, it only changes the strong interaction. Therefore a logical conclusion is made that the renormalization of the energy of electromagnetic excitations (excitons, phonons) is carried out by the strong (nuclear) interaction.
      PubDate: Feb 2017
       
  • Fabrication of Straight Optical Waveguides Based on SnO2
           Nanomaterials

    • Abstract: Publication date:  Aug 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  4  Asnawi   Gatut Yudoyono   and Yono Hadi Pramono   The manufacture technology of thin film waveguides had done by placing a solution of tin dioxide (SnO2) on the glass substrate. The structure of the straight waveguide consists of a slide glass substrate, waveguide using tin oxide film, and the cover waveguide is the MMA (Methyl Methacrylate) film. The method for making this waveguides, the waveguide was fabricated using the spin coating method and photolithography technique. The method for making this waveguides, the waveguide was fabricated using the spin coating method and photolithography technique. Analysis of the intensity of the input and output on a straight channels waveguide is done by an optical microscope with the light source of He-Ne laser. The results have obtained the multimode waveguides with the average thickness of straight channels is 16.67 μm.
      PubDate: Aug 2017
       
  • Researches for a Decommissioning Device Development Concept of the
           Horizontal Fuel Channel in the CANDU 6 Nuclear Reactor: Presentation,
           Functioning and Operating

    • Abstract: Publication date:  Aug 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  4  Gabi Rosca-Fartat   Constantin Popescu   and Nicolae Pana   This paper present a possible method for decommissioning of the horizontal fuel channels in the CANDU 6 nuclear reactor, a new device design concept solution with an operating panel. The device shall be designed according to the radiation protection procedures. The horizontal fuel channels decommissioning device from the CANDU 6 nuclear reactor is an electromechanical system with many freedom degrees, able to perform the internal components extraction and manage the storage into the waste container. The operations are performed under the control of a system equipped with a Programmable Logic Controller (PLC) and monitored by an operator panel, Human Machine Interface (HMI) type. The fuel channel decommissioning device ensures full radiation protection of workers and environment during the dismantling stages.
      PubDate: Aug 2017
       
  • In Situ Investigation of Oxidation of Aluminum Alloy Powders with Calcium
           and Barium by Synchrotron Radiation

    • Abstract: Publication date:  Aug 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  4  Vladimir G. Shevchenko   Danil A. Eselevich   Alexey I. Ancharov   and Boris P. Tolochko   The phase composition and structure of initial powders and the products of oxidation of aluminum alloys with calcium and barium containing 0.88 and 0.26 at.% of dopants, respectively, have been studied for the first time by the diffraction method with the use of synchrotron radiation during programmed heating in air up to 1273 K at a rate of 10 K/min. It was established that as a result of the heterogeneity of the phase composition of the oxidation products and the structural changes in the oxide shell on the particle surface, aluminum oxide loses its high protective properties and metal oxidation is activated.
      PubDate: Aug 2017
       
  • Photophysical Features of Phthalocyanines Metallocomplexes with
           Out-of-Plane Ligands

    • Abstract: Publication date:  Aug 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  4  A. Starukhin   A. Gorski   V. Knyukshto   M. Kijak   I. Tretyakova   Y. Dovbii   and V. Chernii   The objective of this work was synthesizing of Ti-, Zr-, Hf-phthalocyanines, containing chloride ions or dibenzoylmethanate fragments coordinated in out-of-plane positions to macrocycle. Spectroscopic and photophysical parameters of phthalocyanines metallocomplexes with metal atoms Ti(IV), Zr(IV) and Hf(IV) and spectroscopic features of Mg- and Zn-phthalocyanines have been detected and characterized at ambient and liquid nitrogen temperatures. The efficient intersystem crossing observed for Hf-phthalocyanine leads to very weak fluorescence and suppresses the fluorescence lifetimes to less than 1 ns. Changing of nature of central metals from heavy Hf(IV) atom to lighter atoms: Zr(IV), Zn(II), Ti(IV), Mg(II) lead to noticeable increasing of fluorescence lifetimes up to maximum value of 6,6 ns for Mg-phthalocyanine. At the same time the values of fluorescence quantum yield rises from 1 % for Hf-phthalocyanine to 56 % for Mg-phthalocyanine. The heavy atom effect has a substantially greater impact on photophysical parameters metallocomplexes of phthalocyanines than influence of attachment out-of-plane ligands.
      PubDate: Aug 2017
       
  • Peculiarities of Surface Interaction of Al+REM Alloys with Air and Water

    • Abstract: Publication date:  Aug 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  4  N.A. Popov   L.A. Akashev   V.G. Shevchenko   and I.G. Grigorov  The effect of the phase and chemical composition of aluminium+rare earth metal (1-2.5%R, ~22%R) polycrystalline alloys (Al+REM) on the rate of their surface film growth in air (at temperatures 400, 500, 600℃) and in water (~100℃) was studied. It is shown that in the temperature range 500-600℃ the oxidation of 1-2.5%R alloys in air is enhanced due to the increasing amount of REM oxide phases and crystallization of amorphous Al2O3. Al+1at.%Yb alloy shows the lowest oxidation stability in this temperature range owing to the formation of the greatest amount of REM oxides. Oxidation of Al+REM (~22%R) alloys in air begins at a temperature below 400℃. Their oxidation rate depends on the type and amount of dopant metal and the phase composition: the presence of REM-rich intermetallics in the alloy dramatically increases its reactivity. It is established that in the interaction of Al+REM alloys with boiling water, the active reacting phase is aluminum.
      PubDate: Aug 2017
       
  • Determination of Spatial Resolution of Positron Emission Tomograph of
           Clear PET-XPAD3/CT System

    • Abstract: Publication date:  Aug 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  4  H. Olaya Dávila   S. A. Martínez Ovalle   H. Pérez   and H.Castro   Based on The National Electrical Manufacturers Association (NEMA), using the AMINE software to construction of sinograms and using a positron emission source of 22Na, were made calculations to determine the spatial resolution of a ring array system of phoswich detectors of positron emission tomograph included in the CLEAR PET-XPAD3/CT prototype for small animals, made in the laboratories of CCPM and whose project is led by the research group ImXgam. The radioactive source 22Na of approximately 9 MBq of activity, with spherical shape and diameter of 0.57mm is immersed in a plexiglas disc that was located at the geometric center of tomographic system with a Field of View (FOV) of 35 mm in the axial and transverse directions. Displacements of radioactive source were performed on the three cartesian axes and was rebuilt a sinogram for each axis. The shape of sinogram allows describe the correct position and the maximum efficiency of each detector. Subsequently, was carried out a scanning in each one of three spatial axes taking enough distance to cover the dimensions of radioactive source. Data for each phoswich detector were recorded. The process was repeated for other axes and then radioactive source was centered with respect to the FOV and were calculated FWHM (Full Width at Half Maximum) and FWTM (Full Width at Tenth Maximum) values and performing statistics of these values with parabolic fitting, the latter setting allows to obtain parameters of spatial resolution of system.
      PubDate: Aug 2017
       
  • Standard Cosmological Models with ∧> 0

    • Abstract: Publication date:  Apr 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  2  Paulo Aguiar   In this paper we show that the cosmological standard models can describe our universe very realistic way if we add a positive value of the cosmological constant, without the need for the introduction of cold dark matter. Also we clarify that it is physically allowed objects to move in the Universe at speeds greater than light speed without violation of Einstein's postulates.
      PubDate: Apr 2017
       
  • Crystal Structure and Theoretical Study of
           N,N-di[(5-chloro-2-oxo-2,3-dihydrobenzo[d]oxazole-3-yl)methyl]ethanamine

    • Abstract: Publication date:  Apr 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  2  Abdullah Aydin   Zeynep Soyer   Mehmet Akkurt   and Orhan Buyukgungor   The aim of the present work is to explore crystal and electronic structure of N,N-di[(5-chloro-2-oxo-2,3-dihydrobenzo[d]oxazole-3-yl)methyl]ethanamine. In the title compound, C18H15Cl2N3O4, the two 2, 3-dihydro-1, 3-benzoxazole ring systems are almost planar and make a dihedral angle of 96.12(7) with each other. The ethyl group is disordered over two set of sites with a site-occupancy ratio of 0.766(12):0.234(12). The crystal structure contain intermolecular C—H...O hydrogen bonds which form a zigzag chains along the c-axis, C—H...π interactions and π-π stacking interactions [centroid-centroid distance = 3.5668(19) Å].
      PubDate: Apr 2017
       
  • Quality Control of Intensity Modulated Radiation Therapy (IMRT)

    • Abstract: Publication date:  Apr 2017
      Source:Universal Journal of Physics and Application  Volume  11  Number  2  M. Rayhan Uddin   Kushal Chanda   and M. Anwarul Islam   The aim of this study is to ensure the MLC positional and leaf speed accuracy. To check the MLC positional and leaf speed accuracy picket fence and synchronized segmented stripes test pattern were performed. The relative and absolute dosimetric verification were analyzed in this study. This project was followed by Quality control for Intensity-Modulated Radiation Therapy, as in the Recommendation No.15 from SGSMP. For relative dosimetric verification test such as different dose in same depth, same dose in different depth, chair test and inhomogeneous test were performed. All the plans were followed by Gamma index. To verify absolute dose 0.3 cc SemiFlex chamber along with a PTW solid water phantom was used. In picket fence and synchronized segmented stripes test, match-lines appear at -10.0, -5.0, 0.0, 5.0, 10.0 and -12.0, -8.0, -4.0, 0.0, 4.0, 8.0, 12.0 cm respectively from the center of the field. The Gamma Index for the different dose in same depth, same dose in different depth, chair test and inhomogeneous test were 99.48% & -0.52%, 99.35% & -0.65%, 99.04% & -1.96% and 98.34% & -1.66% at the pixel range of -1.00 to 1.00 & 1.00 to 2.00 respectively. Calculated and measured absolute dose for three cases were 2.050 &1.970 (% deviation 4.06), 1.728 & 1.730 (% deviation -0.011) and 1.270 & 1.250 (% deviation 1.6).
      PubDate: Apr 2017
       
 
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
 
Home (Search)
Subjects A-Z
Publishers A-Z
Customise
APIs
Your IP address: 54.234.45.10
 
About JournalTOCs
API
Help
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-2016