2,387 research outputs found
Author Correction: Casimir forces exerted by epsilon-near-zero hyperbolic materials (Scientific Reports, (2020), 10, 1, (16831), 10.1038/s41598-020-73995-0)
No full textIn the original version of this Article, Igor S. Nefedov was incorrectly affiliated with “Saratov State University, Astrakhanskaya 83, Saratov, Russian Federation, 410012”. The correct affiliation is listed below: Peoples’ Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya St., Moscow 117198, Russia. This error has now been corrected in the HTML and PDF versions of the Article. © 2020, The Author(s)
PKE–Nefedov*: plasma crystal experiments on the International Space Station
No full textAbstract. The plasma crystal experiment PKE–Nefedov, the first basic science experiment on the International Space Station (ISS), was installed in February 2001 by the first permanent crew. It is designed for long-term investigations of complex plasmas under microgravity conditions. ‘Complex plasmas ’ contain ions, electrons, neutrals and small solid particles—normally in the micrometre range. These microparticles obtain thousands of elementary charges and interact with each other via a ‘screened ’ Coulomb potential. Complex plasmas are of special interest, because they can form liquid and crystalline states (Thoma
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PKE-Nefedov*: Plasma crystal experiments on the International Space Station
No full textThe plasma crystal experiment PKE-Nefedov, the first basic science experiment on the International Space Station (ISS), was installed in February 2001 by the first permanent crew. It is designed for long-term investigations of complex plasmas under microgravity conditions. 'Complex plasmas' contain ions, electrons, neutrals and small solid particles - normally in the micrometre range. These microparticles obtain thousands of elementary charges and interact with each other via a 'screened' Coulomb potential. Complex plasmas are of special interest, because they can form liquid and crystalline states (Thomas et al 1994 Phys. Rev. Lett. 73 652-5, Chu and I 1994 Phys. Rev. Lett. 72 4009-12) and are observable at the kinetic level. In experiments on Earth the microparticles are usually suspended against gravity in strong electric fields. This creates asymmetries, stresses and pseudo-equilibrium states with sufficient free energy to readily become unstable. Under microgravity conditions the microparticles move into the bulk of the plasma (Morfill et al 1999 Phys. Rev. Lett. 83 1598), experiencing much weaker volume forces than on Earth. This allows investigations of the thermodynamics of strongly coupled plasma states under substantially stress-free conditions. In this first paper we report our results on plasma crystals, in particular the first experimental observations of bcc lattice structures
Iodine incorporation into polymeric films investigated by angle-resolved XPS
No full textDistribution of elements into subsurface layers (up to 120 angstrom thickness) of polyphenylacetylene (PPA) films doped with I2 vapour has been determined by X-ray photoelectron spectroscopy data using a unique numerical technique. Concentration of incorporated iodine has been shown to increase with exposure time; the concentration profiles are dome-shaped and iodine does not penetrate much into the bulk of PPA films, even when exposed to I2 vapours for 1 h. The depth of the layer corresponding to maximum iodine concentration is directly proportional to the iodine exposure time. The non-homogeneous distribution of the doping species in the polymer may be responsible for the low conductivity observed for heterogeneously doped PPA films
Dispersive properties of finite, one-dimensional photonic band gap structures: Applications to nonlinear quadratic interactions
No full textWe discuss the linear dispersive properties of finite one-dimensional photonic band-gap structures. We introduce the concept of a complex effective index for structures of finite length, derived from a generalized dispersion equation that identically satisfies the Kramers-Kronig relations. We then address the conditions necessary for optimal, phase-matched, resonant second harmonic generation. The combination of enhanced density of modes, field localization, and exact phase matching near the band edge conspire to yield conversion efficiencies orders of magnitude higher than quasi-phase-matched structures of similar lengths. We also discuss an unusual and interesting effect: counterpropagating waves can simultaneously travel with different phase velocities, pointing to the existence of two dispersion relations for structures of finite length
Investigation of the structural properties of thin amorphous carbon films and bilayer structures
No full textПоэтика народнического травелога конца XIX века (путевые очерки Ф. Д. Нефедова)
No full text462The article deals with the late stage of the Narodnik?s (populist) fiction of early 1890-s in the aspect of deep cognition of Russia, which was important on the turn of the century. The subject matter is the travel essays of the writer-ethnographer F.D. Nefedov, who is forgotten nowadays. The article describes some features of the poetics of the Narodnik?s travelogue (the narrator, the compositional principle of contrast a conflict within a single scene, etc.), the originality of the demonstration of the author?s position and synthetical genre structure. According to the type of the plot construction Nefedov?s travelogue is close to a story. His plot is not only localy attached to a certain scene or a situation, but also contains the idea which is expressed in the attempts of the privileged class characters to get closer to the ordinary people, but their realization remains outside the plot. The poetics of Nefedov?s travel essays reflects both the ideological position of the author an
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Formation and behaviour of dust particle clouds in a radio-frequency discharge: Results in the laboratory and under microgravity conditions
No full textIn this paper we report the first observation on submicron dust particle clouds grown in a radio-frequency sputtering discharge under microgravity conditions. These results have been obtained in the PKE-Nefedov (Plasma Kristall Experiment) chamber in the framework of a French-German-Russian programme. A dust-free region, usually called the 'void', is observed in the laboratory and under microgravity conditions even with submicron particles. In this region, successive generations of particles can be grown, leading to the coexistence of particles with various sizes. Each generation of particles constitutes a cloud separated from the others by a definite sheath. Dynamics of these clouds have been investigated showing vortex-like motions or independent behaviour of small heaps of particles, emphasizing both attractive and repulsive effects between dust clouds. As these particles drastically influence the plasma properties, the growth kinetics is followed through the evolution of the discharge current
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