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Search Results: 1 - 10 of 50526 matches for " Y PRYSIAZHNYI "
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Atmospheric Pressure Plasma Treatment and Following Aging Effect of Chromium Surfaces  [PDF]
Vadym Prysiazhnyi
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2013, DOI: 10.4236/jsemat.2013.32018
Abstract:

The results of atmospheric pressure plasma treatments using diffuse coplanar surface barrier discharge (type of surface dielectric barrier discharge) on chromium surfaces are reported. A significant increase of surface wettability was observed after short plasma exposition. A quantitative value of surface wettability, i.e. the surface free energy, changed from 29 mJ/m2 to over 80 mJ/m2. In time, a hydrophobic recovery of the plasma treated surfaces was observed. Careful study by surface free energy measurements and x-ray photoelectron spectroscopy was performed to be able explaining the effects of plasma treatment. Studied samples were treated in air, oxygen and nitrogen plasma and aged in air and vacuum. Main reasons for increased wettability and aging effect are surface cleaning and transformations in chromium oxide. Additionally, generation of surface nitrate groups was found on the chromium surface as a result of plasma treatment in humid air.

Study of oxidative desulphurization process of coal with different metamorphism degrees
SPYSH'YEV,V GUNKA,YPRYSIAZHNYI,K SHEVCHUK,A PATTEK-JANCZYK,
S PYSH'YEV
,V GUNKA,Y PRYSIAZHNYI,K SHEVCHUK,A PATTEK-JANCZYK

燃料化学学报 , 2012,
Abstract: The oxidative desulphurization process of coal with different metamorphism degrees treated by an air-steam mixture has been studied.It has been shown that the pyrite present in black coal and anthracite is oxidized with the sulphur dioxide formation,and the process chemical mechanism does not depend on the quality of organic matter.The medium-metamorphized coal,capable of turning into a plastic state and cake in the range of investigated temperatures(350~450 ℃),is desulphurized with the greatest difficulty.The chemical mechanism dealing with the transformations of pyritic sulphur present in brown coal differs from similar processes taking place in black coal and anthracite,because FeS2 is converted with hydrogen sulphide formation at desulphurization.
Generation of Cold Argon Plasma Jet at the End of Flexible Plastic Tube
Konstantin G. Kostov,Munemasa Machida,Vadym Prysiazhnyi
Physics , 2014,
Abstract: This brief communication reports a new method for generation of cold atmospheric pressure plasma jet at the downstream end of a flexible plastic tube. The device consists of a small chamber where dielectric barrier discharge (DBD) is ignited in Argon. The discharge is driven by a conventional low frequency AC power supply. The exit of DBD reactor is connected to a commercial flexible plastic tube (up to 4 meters long) with a thin floating Cu wire inside. Under certain conditions an Ar plasma jet can be extracted from the downstream tube end and there is no discharge inside the plastic tube. The jet obtained by this method is cold enough to be put in direct contact with human skin without electric shock and can be used for medical treatment and decontamination.
A New Paradigm for Metallic Alloys in Materials Science  [PDF]
Y. Ustinovshikov
Advances in Materials Physics and Chemistry (AMPC) , 2015, DOI: 10.4236/ampc.2015.57025
Abstract: In the article, taking into account the phase transition “ordering-phase separation” discovered in alloys, new concepts about the diffusion phase transformations in alloys are formulated: chemical interaction between dissimilar atoms exists always in all alloys and at any temperature of heating; alloys offer a surprising and not previously known property of changing the sign of the chemical interaction between dissimilar atoms at a change of the temperature or composition of alloys; diffusion processes occurring in alloys at different temperatures depend on the sign and the absolute magnitude of the energy of the chemical interaction between dissimilar atoms. All these three concepts are analyzed in detail, by the example of Ni-based and Co-based binary alloys using experimental results obtained by transmission electron microscopy. It is shown, on these ideas, how to carry out heat treatment of alloys more rationally, what principles should underpinned in the base of the construction of phase diagrams, how the microstructures of ordering and phase separation affect some properties of alloys.
Quasi-Square Wave Mode Phase-Shifted PWM LCC Resonant Converter for Regulated Power Supply  [PDF]
S. PADMANABHAN, Y. SUKHI, Y. JEYASHREE
Engineering (ENG) , 2009, DOI: 10.4236/eng.2009.13024
Abstract: This paper presents an improved self sustained oscillating controller circuit using LCC components for improving the overall efficiency of the system. It has a micro controller based active controller, which controls the performance from no-load up to full-load. The steady state characteristics are developed and a design example is given in detail. The proposed controller allows zero current switching at any loading condition which results in a reasonable reduction of power loss during switching with a promising efficiency. Analytical and experimental results verify the achievement the design specifications.
After the Treatment Phase of Colorectal Cancer Care: Survivorship and Follow-Up  [PDF]
Maria Y. Ho, Winson Y. Cheung
Journal of Cancer Therapy (JCT) , 2012, DOI: 10.4236/jct.2012.326125
Abstract: The number of long-term colorectal cancer (CRC) survivors has increased substantially over the past three decades due to both ongoing advances in early detection and improvements in cancer therapies. Adult survivors of CRC experience chronic health conditions due to normal issues associated with aging, which is further compounded by the long-term adverse effects of having had cancer and anti-cancer therapies. In addition, they are at a higher risk for CRC recurrences, new primary cancers, and other co-morbidities. This article will provide an overview of the clinical care of adult survivors of CRC. Epidemiologic data will be presented followed by a discussion of the approach to the care of long-term adult survivors of CRC, including surveillance of recurrences and new primary cancers, interventions to manage both physical and psychological consequences of cancer and its treatments, and strategies to address concerns related to unemployment and disability. Finally, we will explore the challenges of healthcare delivery, especially with respect to the coordination of follow-up between cancer specialists and primary care physicians, so as to ensure that all of the survivor’s health needs are met promptly and appropriately.
Electronic states and pairing symmetry in the two-dimensional 16 band d-p model for iron-based superconductor
Y. Yanagi,Y. Yamakawa,Y. ōno
Physics , 2008, DOI: 10.1143/JPSJS.77SC.149
Abstract: The electronic states of the FeAs plane in iron-based superconductors are investigated on the basis of the two-dimensional 16-band d-p model, where the tight-binding parameters are determined so as to fit the band structure obtained by the density functional calculation for LaFeAsO. The model includes the Coulomb interaction on a Fe site: the intra- and inter-orbital direct terms U and U', the exchange coupling J and the pair-transfer J'. Within the random phase approximation (RPA), we discuss the pairing symmetry of possible superconducting states including s-wave and d-wave pairing on the U'-J plane.
Detecting the light of the night sky in Mars  [PDF]
Nebil Y. Misconi
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.34036
Abstract: In this paper a new methodology is outlined to detect the dust content in the Martian atmosphere during nighttime. In the previous Lander missions to Mars, scientists were able to determine the dust load in the Martian atmosphere during daylight using spectral lines of the Sun. Since the dynamics of Martian dust storms had been determined to be very rapid changing over times of hours and not days, it is imperative to determine the dust load during nighttime, so future astronauts to Mars can take protective measures for their equipment. They can also factor this effect for their planned activities during daytime. The new methodology greatly improves on the classical method for determining the extinction in the Earth’s atmosphere. The classical method uses observations of bright stars from which the optical depth, ?total, can then be deduced from the classical brightness equation. The classical method succeeds reasonably well at high elevation angles from the horizon but fails dramatically at low elevation angles. It also determines ?total from the slope of a plot of observed brightness of a bright star vs. air mass at all elevations. The plot shows a straight line at high elevations angles, which then curves and becomes uncertain at low elevation angles. The new methodology bypasses this severe difficulty by simply eliminating this plot, and by acquiring the brightness of a bright star above the atmosphere (no extinction) and compares it to the observed bright- ness of the same star below the atmosphere at all elevations.
The Effects of Dimension Ratio and Horizon Length in the Micropolar Peridynamic Model  [PDF]
Y. Ferhat, I. Ozkol
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.36071
Abstract: The aim of this study is to investigate the effects of horizon selection on the elastic behaviour of plate type structures in the micropolar peridynamic theory. Plates with various lengths and widths have been investi-gated using micropolar peridynamic model for different horizon selections. The mathematical model of plates has been provided applying the micropolar peridynamic theory and solution of this model has been obtained by finite element methods. The displacement fields have been computed for the different horizons and dimension ratios of plates. To compute the displacement field a program code has been developed by using the software package MATHEMATICA. The results obtained have been compared with the analytical solution of the classical elasticity theory and with the solution of displacement based finite element methods. For displacement based finite element method solution the software package ANSYS has been used. Ac-cording to results it has been observed that the displacement fields of the plates are strongly affected by ho-rizon selection. Therefore a question raises that which horizon length should be used with the problem in hand or is there any method to find the appropriate/best horizon length.
Distortion of Space and Time during Saccadic Eye Movements  [PDF]
M. Suzuki, Y. Yamazaki
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.22011
Abstract: The space-time distortion perceived subjectively during saccadic eye movements is an associative phenomenon of a transient shift of observer’s visual frame of reference from one position to another. Here we report that the lines of subjective simultaneity defined as two spatially separated flashes perceived during saccades were nearly uniformly tilted along the physical time-course. The causality of the resulting space-time compression may be explained by the Minkowski space-time diagram in physics.
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