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Search Results: 1 - 10 of 258575 matches for " V. F.; "
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Thermoelectric Figure of Merit of a Material Consisting of Particles in Dependency on the Parameters of a Material  [PDF]
F. V. Kharlamov, V. F. Kharlamov
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.210108
Abstract: The properties of a ball-shaped semiconductor particles and metal particles with a semiconductor thin film on the surface thereof are established. So the dimensionless thermoelectric figure of merit of a material consisting of a large number of these particles is equal to 10 - 100.
Computer Models of Helical Nanostructures  [PDF]
V. F. Pleshakov
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.23016
Abstract: A task of mapping a hexagonal grid to different types of helical surfaces including nanocones, nanotubes and nanoscrolls by unfolding a given surface to a carbon layer plane has been solved. Basing on these models, polyhedric models with all atomic bonds being constant and equal to 1.42? as in a flat carbon layer have been built, and an algorithm of coloring all faces of such models has been developed. Received models can be utilized for visual demonstration of the helical growth of nanotubes, nanocones, nanofiber and other nanoobjects, and also for physical properties calculation.
Results and Prospects of Experimental Validation of the Use of Electromagnetic Waves at Terahertz Frequencies of Cellular Metabolites in Clinical Practice  [PDF]
V. F. Kirichuk
Engineering (ENG) , 2015, DOI: 10.4236/eng.2015.75025
Abstract: The paper presents the results of experimental studies of the effect of irradiation with electromagnetic waves terahertz frequencies of molecular spectrum of emission and absorption of nitric oxide and atmospheric oxygen on animals in a state of acute and chronic immobilization stress, a condition regarded as a model of violations in different parts of the vascular system including microcirculation specific for different parts of the vascular system, including the microcirculation characteristic of various diseases of the cardiovascular system.
Free Volume in Membranes: Viscosity or Tension?  [PDF]
V. S. Markin, F. Sachs
Open Journal of Biophysics (OJBIPHY) , 2015, DOI: 10.4236/ojbiphy.2015.53007
Abstract: Many papers have used fluorescent probe diffusion to infer membrane viscosity but the measurement is actually an assay of the free volume of the membrane. The free volume is also related to the membrane tension. Thus, changes in probe mobility refer equally well to changes in membrane tension. In complicated structures like cell membranes, it appears more intuitive to consider variations in free volume as referring to the effect of domains structures and interactions with the cytoskeleton than changes in viscosity since tension is a state variable and viscosity is not.
Problems of Birds Sex Determination  [PDF]
Antonina V. Trukhina, Aleksandr F. Smirnov
Natural Science (NS) , 2014, DOI: 10.4236/ns.2014.615111
Abstract: Sex determination system in birds is characterized by a homo-(Neognatae) and heteromorphic (Paleognatae) sex chromosomes. Heterogametic sex is female (ZZ/ZW system). DMRT1 gene is a gene regarded as a main male sex determining factor in this group of animals. The question remains about the participation of other factors (HEMOGEN, AMH etc.) in appearance of testis, and the role of steroid hormones in formation of ovaries. Complete sex inversion is not typical for species with genotypic sex determination (GSD), although the effect of estrogen metabolites is noted for birds. For birds epigenetic mechanisms of regulation (methylation of DNA and non-coding RNA) have been described for sex controlling genes such as CYP19A1 and DMRT1.
Anisotropy of small-scale stratospheric irregularities retrieved from scintillations of a double star α-Cru observed by GOMOS/ENVISAT
V. Kan, V. F. Sofieva,F. Dalaudier
Atmospheric Measurement Techniques (AMT) & Discussions (AMTD) , 2012,
Abstract: In this paper, we discuss estimating anisotropy of air density irregularities (ratio of characteristic horizontal and vertical scales) from satellite observations of bi-chromatic scintillations of a double star whose components are not resolved by the detector. The analysis is based on fitting experimental auto- and cross-spectra of scintillations by those computed using the 3-D spectral model of atmospheric irregularities consisting of anisotropic and isotropic components. Application of the developed method to the scintillation measurements of the double star α-Cru by GOMOS (Global Ozone Monitoring by Occultation of Stars) fast photometers results in estimates of anisotropy coefficient of ~15–20 at altitudes 30–38 km, as well as other parameters of atmospheric irregularities. The obtained estimates of the anisotropy coefficient correspond to small-scale irregularities, close to the buoyancy scale.
Anisotropy of small-scale stratospheric irregularities retrieved from scintillations of a double star α-Cru observed by GOMOS/ENVISAT
V. Kan,V. F. Sofieva,F. Dalaudier
Atmospheric Measurement Techniques Discussions , 2012, DOI: 10.5194/amtd-5-4881-2012
Abstract: In this paper, we discuss estimating anisotropy of air density irregularities (ratio of characteristic horizontal and vertical scales) from satellite observations of bi-chromatic scintillations of a double star whose components are not resolved by the detector. The analysis is based on fitting experimental auto- and cross-spectra of scintillations by those computed using the 3-D spectral model of atmospheric irregularities consisting of anisotropic and isotropic components. Application of the developed method to the scintillation measurements of the double star α-Cru by GOMOS (Global Ozone Monitoring by Occultation of Stars) fast photometers results in estimates of anisotropy coefficient of ~15–20 at altitudes 30–38 km, as well as other parameters of atmospheric irregularities. The obtained estimates of the anisotropy coefficient correspond to small-scale irregularities, close to the buoyancy scale.
THE DEVELOPMENT OF EFFECTIVE TECHNOLOGIES FOR MACHINES PARTS MACHINING
F. Nоv?kоv,V. Zhovtobryukh
Аvtomob?lnyi Transport , 2011,
Abstract: The conditions of cost reduction and productivity of machining are grounded
Limits on cosmological variation of quark masses and strong interaction
V. F. Dmitriev,V. V. Flambaum
Physics , 2002, DOI: 10.1103/PhysRevD.67.063513
Abstract: We discuss limits on variation of $(m_q/\Lambda_{QCD})$. The results are obtained by studying $n-\alpha$-interaction during Big Bang, Oklo natural nuclear reactor data and limits on variation of the proton $g$-factor from quasar absorpion spectra.
Strong magnetic field effect on above-barrier transport in Pb-p-HgCdTe Schottky barriers
V. F. Radantsev,V. V. Zavyalov
Physics , 2012, DOI: 10.1088/0268-1242/28/3/035004
Abstract: Due to large difference in effective masses of light and heavy holes it is usually supposed that the above-barrier current in Schottky barriers on p-type semiconductor is controlled only by the heavy holes. However, in real structures, there is an additional potential barrier caused by a oxide layer at interface. For typical values of thickness and height of a barrier its tunnel transparency for light holes can be higher by three order of magnitude than that for heavy holes. Due to such separative role of insulator layer one can expect that the current is manly a contribution of light holes. To clear up this problem the investigation of transport in a magnetic field is used as a key experiment in this work. The pronounced magnetic field effect for heavy holes in investigated Pb-p-HgCdTe Schottky barriers is expected only at extremely strong magnetic fields B>10 T within the framework of both diode and diffusion mechanism of transport. At the same time experimentally more than twofold decrease in saturation current is observed even at B=0.5 T at any orientation of magnetic field. The studies performed for HgCdTe with different Kane's gap and at different temperatures show that the magnitude of magnetic field effect is uniquely determined by the ratio of light hole cyclotron energy to a thermal energy. However the magnitude of effect exceeds considerably the prediction of the simple theory and the experimental magnetic field dependencies of a saturation current do not follow the simple exponential falling predicted for thermionic current. The reason of this discrepancy remains a mystery.
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