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Search Results: 1 - 10 of 304188 matches for " V. N. Samoilov "
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Two new type surface polaritons excited into nanoholes in metal films
V. N. Minasyan,V. N. Samoilov
Physics , 2009,
Abstract: First, we argue that the smooth metal-air interface should be regarded as a distinct dielectric medium, the skin of the metal. The existence of this metal skin leads to theoretical explanation of experimental data on the excitation of electromagnetic surface shape resonances in lamellar metallic gratings by light in the visible to near-infrared range. Surface polaritons have been observed in reflection modes on metallized gratings where the electric field is highly localized inside the grooves (around 300-1000 times larger than intensity of incoming optical light). Here we present quantized Maxwell's equations for electromagnetic field in an isotropic homogeneous medium, allowing us to solve the absorption anomaly property of these metal films. The results imply the existence of light boson particles with spin one and effective mass $m= 2.5\cdot 10^{-5} m_e$. We also show the presence of two new type surface polaritons into nanoholes in metal films.
New resonance-polariton Bose-quasiparticles enhances optical transmission into nanoholes in metal films
V. N. Minasyan,V. N. Samoilov
Physics , 2011, DOI: 10.1016/j.physleta.2010.12.002
Abstract: We argue the existence of fundamental particles in nature, neutral Light-Particles with spin 1, and rest mass $m=1.8\cdot 10^{-4} m_e$, in addition to electrons, neutrons and protons. We call these particles Light Bosons because they create the electromagnetic field which represents Planck's gas of massless photons together with a gas of Light Particles in the condensate. In this respect, the condensed Light Particles, having no magnetic field, represent the constant electric field. In this context, we predict a existence of plasmon-polariton and resonance-polariton Bose-quasiparticles with effective masses $m_l\approx 10^{-6} m_e$ and $m_r=0.5m_e$, which are induced by interaction of the plasmon field and the resonance Fr$\ddot o$lich- Schafroth charged bosons with electromagnetic wave in metal. Also, we prove that the enhancement optical transmission into nanoholes in metal films and Surface Enhanced Raman Spectroscopy are provided by a new resonance-polariton Bose-quasiparticles but not model of surface plasmon-polariton. In this letter, the quantization Fresnel's equations is presented which confirms that Light Particles in the condensate are concentrated near on the wall of grooves in metallic grating and, in turn, represent as the constant electric field which provides the launching of the surface Fr\"olich- Schafroth bosons on the surface metal holes.
Velocity dependence of friction of confined polymers
I. M. Sivebaek,V. N. Samoilov,B. N. J. Persson
Physics , 2009,
Abstract: We present molecular dynamics friction calculations for confined hydrocarbon solids with molecular lengths from 20 to 1400 carbon atoms. Two cases are considered: (a) polymer sliding against a hard substrate, and (b) polymer sliding on polymer. We discuss the velocity dependence of the frictional shear stress for both cases. In our simulations, the polymer films are very thin (approx. 3 nm), and the solid walls are connected to a thermostat at a short distance from the polymer slab. Under these circumstances we find that frictional heating effects are not important, and the effective temperature in the polymer film is always close to the thermostat temperature. In the first setup (a), for hydrocarbons with molecular lengths from 60 to 1400 carbon atoms, the shear stresses are nearly independent of molecular length, but for the shortest hydrocarbon C20H42 the frictional shear stress is lower. In all cases the frictional shear stress increases monotonically with the sliding velocity. For polymer sliding on polymer [case (b)] the friction is much larger, and the velocity dependence is more complex. For hydrocarbons with molecular lengths from 60 to 140 C-atoms, the number of monolayers of lubricant increases (abruptly) with increasing sliding velocity (from 6 to 7 layers), leading to a decrease of the friction. Before and after the layering transition, the frictional shear stresses are nearly proportional to the logarithm of sliding velocity. For the longest hydrocarbon (1400 C-atoms) the friction shows no dependence on the sliding velocity, and for the shortest hydrocarbon (20 C-atoms) the frictional shear stress increases nearly linearly with the sliding velocity.
Semi-inclusive polarized DIS in terms of Melin moments.I. Light sea quark polarized distribustions
A. N. Sissakian,O. Yu. Shevchenko,V. N. Samoilov
Physics , 2000,
Abstract: In connection with the semi-inclusive polarized DIS, it is proposed to consider the first Melin moments $\Delta q$ of the polarized quark and antiquark densities, instead of the respective variables $\delta q(x)$, local in Bjorken x themselves. This gives rise to a very essential simplification of the next to leading order (NLO) QCD and, besides, allows one to use the respective QCD sum rules. An expression for $\Delta\bar{u}-\Delta\bar{d}$ in NLO is obtained which is just a simple combination of the directly measured asymmetries and of the quantities taken from the unpolarized data.
The peculiarities of distributions of overfocused sputtered atoms ejected from (001) Ni with energy and angular resolution
V. N. Samoilov,A. I. Musin,N. G. Ananieva
Physics , 2015,
Abstract: The features of the azimuthal-angle overfocusing of atoms sputtered from the surface of the Ni (001) face are studied by molecular dynamics computer simulation. The signal of overfocused atoms is found to be multi-valued with respect to the initial azimuthal angle due to different mechanisms of scattering. The overfocused atoms form separate maximum and can be detected in experiments with angle and energy resolution separately from the focused and the own atoms.
Effective Viscosity of Confined Hydrocarbons
I. M. Sivebaek,V. N. Samoilov,B. N. J. Persson
Physics , 2012, DOI: 10.1103/PhysRevLett.108.036102
Abstract: We present molecular dynamics friction calculations for confined hydrocarbon films with molecular lengths from 20 to 1400 carbon atoms. We find that the logarithm of the effective viscosity \mu eff for nanometer-thin films depends linearly on the logarithm of the shear rate: log(effective viscosity) = C - n log (shear rate), where n varies from 1 (solidlike friction) at very low temperatures to 0 (Newtonian liquid) at very high temperatures, following an inverse sigmoidal curve. Only the shortest chain molecules melt, whereas the longer ones only show a softening in the studied temperature interval 0 < T < 900 K. The results are important for the frictional properties of very thin (nanometer) films and to estimate their thermal durability.
Effect of surface roughness and adsorbates on superlubricity
V. N. Samoilov,C. Yang,U. Tartaglino,B. N. J. Persson
Physics , 2006,
Abstract: We study the sliding of elastic solids in adhesive contact with flat and rough interfaces. We consider the dependence of the sliding friction on the elastic modulus of the solids. For elastically hard solids with planar surfaces with incommensurate surface structures we observe extremely low friction (superlubricity), which very abruptly increases as the elastic modulus decreases. We show that even a relatively small surface roughness or a low concentration of adsorbates may completely kill the superlubricity state.
Ultracold Fermi and Bose gases and Spinless Bose Charged Sound Particles
Minasyan V.,Samoilov V.
Progress in Physics , 2011,
Abstract: We propose a novel approach for investigation of the motion of Bose or Fermi liquid (or gas) which consists of decoupled electrons and ions in the uppermost hyper ne state. Hence, we use such a concept as the uctuation motion of “charged uid particles” or “charged uid points” representing a charged longitudinal elastic wave. In turn, this elastic wave is quantized by spinless longitudinal Bose charged sound particles with the rest mass m and charge e0. The existence of spinless Bose charged sound particles allows us to present a new model for description of Bose or Fermi liquid via a non-ideal Bose gas of charged sound particles. In this respect, we introduce a new postulation for the super uid component of Bose or Fermi liquid determined by means of charged sound particles in the condensate, which may explain the results of experiments connected with ultra-cold Fermi gases of spin-polarized hydrogen, 6 Li and 40 K, and such a Bose gas as87 Rb in the uppermost hyper ne state, where the BoseEinstein condensation of charged sound particles is realized by tuning the magnetic eld.
Superfluidity Component of Solid 4He and Sound Particles with Spin 1
Minasyan V.,Samoilov V.
Progress in Physics , 2011,
Abstract: We present a new model for solid which is based on such a concept as the uctuation motion of “solid particles” or “solid points”. The uctuation motion of “solid particles” in solid 4He represents a longitudinal elastic wave which is in turn quantized by neutrallongitudinal Bose sound particles with spin 1 with the rest mass m. Thus, rst we remove a concept of “lattice” for solid by presentation of new model of one as a vibration of sound particles by natural frequency l. In this respect, we rst postulate that the super uid component of a solid 4He is determined by means of sound particles with spin 1 in the condensate.
Arthur Marshall Stoneham (1940-2011)
Minasyan V.,Samoilov V.
Progress in Physics , 2011,
Abstract: The memory of the prominent British physicist, Prof. Arthur Marshall Stoneham (1940-2011), will live in our hearts and souls.
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