The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Alejandro Luque - One of the best experts on this subject based on the ideXlab platform.
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non linear growth of trapped particle modes in linearly stable current carrying plasmas a Fundamental Process in plasma turbulence and anomalous transport
Space Science Reviews, 2005Co-Authors: H Schamel, Alejandro LuqueAbstract:The two-stream instability as a Fundamental Process in a current-carrying plasma is reconsidered. Its well-established linear version, based on kinetic Landau theory, predicts a threshold for the drift velocity between both species below which the plasma should be stable. We report on simulations which, however, show that a plasma as a non-linearly responding medium can be destabilized well below this threshold. Responsible for this unexpected behaviour are coherent, electrostatic, trapped particle structures such as phase space vortices or holes which can grow non-linearly out of thermal noise receiving their energy from the net imbalance of loss of electron kinetic energy and gain of ion kinetic energy. The birth of predominantly zero-energy holes is shown numerically being associated with initial, non-topological fluctuations. The latter are not subject to Landau damping, as they lie outside the realm of linear wave theory. For a pair plasma a typical scenario is presented, which encompasses several regimes such as non-linear growth of multiple holes, saturation and fully developed structural turbulence as well as an asymptotic approach to a new collisionless equilibrium. During the transient, structural state the plasma transport appears to be highly anomalous.
Vivek Subramanian - One of the best experts on this subject based on the ideXlab platform.
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lubrication related residue as a Fundamental Process scaling limit to gravure printed electronics
Langmuir, 2014Co-Authors: Rungrot Kitsomboonloha, Vivek SubramanianAbstract:In gravure printing, excess ink is removed from a patterned plate or roll by wiping with a doctor blade, leaving a thin lubrication film in the nonpatterned area. Reduction of this lubrication film is critical for gravure printing of electronics, since the resulting residue can lower device performance or even catastrophically impact circuit yield. We report on experiments and quantitative analysis of lubrication films in a highly scaled gravure printing Process. We investigate the effects of ink viscosity, wiping speed, loading force, blade stiffness and blade angle on the lubrication film, and further, use the resulting data to investigate the relevant lubrication regimes associated with wiping during gravure printing. Based on this analysis, we are able to posit the lubrication regime associated with wiping during gravure printing, provide insight into the ultimate limits of residue reduction, and, furthermore, are able to provide Process guidelines and design rules to achieve these limits.
Konstantin S Usachev - One of the best experts on this subject based on the ideXlab platform.
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in vitro reconstitution of the s aureus 30s ribosomal subunit and rbfa factor complex for structural studies
Biochemistry, 2020Co-Authors: Aydar Bikmullin, Liliya I Nurullina, Natalia S Garaeva, E A Klochkova, Dmitry S Blokhin, Alexander A Golubev, Sh Z Validov, Sh I Khusainov, Konstantin S UsachevAbstract:Ribosome-binding factor A (RbfA) from Staphylococcus aureus is a cold adaptation protein that is required for the growth of pathogenic cells at low temperatures (10-15°C). RbfA is involved in the Processing of 16S rRNA, as well as in the assembly and stabilization of the small 30S ribosomal subunit. Structural studies of the 30S-RbfA complex will help to better understand their interaction, the mechanism of such complexes, and the Fundamental Process such as 30S subunit assembly that determines and controls the overall level of protein biosynthesis. This article describes protocols for preparation of RbfA and the small 30S ribosomal subunits and reconstitution and optimization of the 30S-RbfA complex to obtain samples suitable for cryo-electron microscopy studies.
Sh I Khusainov - One of the best experts on this subject based on the ideXlab platform.
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in vitro reconstitution of the s aureus 30s ribosomal subunit and rbfa factor complex for structural studies
Biochemistry, 2020Co-Authors: Aydar Bikmullin, Liliya I Nurullina, Natalia S Garaeva, E A Klochkova, Dmitry S Blokhin, Alexander A Golubev, Sh Z Validov, Sh I Khusainov, Konstantin S UsachevAbstract:Ribosome-binding factor A (RbfA) from Staphylococcus aureus is a cold adaptation protein that is required for the growth of pathogenic cells at low temperatures (10-15°C). RbfA is involved in the Processing of 16S rRNA, as well as in the assembly and stabilization of the small 30S ribosomal subunit. Structural studies of the 30S-RbfA complex will help to better understand their interaction, the mechanism of such complexes, and the Fundamental Process such as 30S subunit assembly that determines and controls the overall level of protein biosynthesis. This article describes protocols for preparation of RbfA and the small 30S ribosomal subunits and reconstitution and optimization of the 30S-RbfA complex to obtain samples suitable for cryo-electron microscopy studies.
Kenichi Sasaki - One of the best experts on this subject based on the ideXlab platform.
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topological raman band in the carbon nanohorn
Physical Review Letters, 2013Co-Authors: Kenichi Sasaki, Yoshiaki Sekine, Kouta Tateno, Hideki GotohAbstract:: Raman spectroscopy has been used in chemistry and physics to investigate the Fundamental Process involving light and phonons. The carbon nanohorn introduces a new subject to Raman spectroscopy, namely topology. We show theoretically that a photoexcited carrier with a nonzero winding number activates a topological D Raman band through the Aharonov-Bohm effect. The topology-induced D Raman band can be distinguished from the ordinary D Raman band for a graphene edge by its peak position.
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elucidation of formation mechanism of bulk heterojunction active layer by real time uv visible absorption and grazing incidence wide angle x ray scattering
Applied Physics Express, 2013Co-Authors: Kenichi Sasaki, Toshihiro Yamanari, Noboru Ohashi, Yuji Yoshida, Yasukiyo UedaAbstract:The drying Process of poly[3-hexylthiophene]:[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) was observed by the real-time measurement of grazing-incidence wide-angle X-ray scattering and ultraviolet–visible absorption for various drying rates. A low drying rate led to high PCBM crystallinity and low P3HT crystallinity. On the other hand, a high drying rate led to low PCBM crystallinity and high P3HT crystallinity. These crystallinities directly affected photovoltaic performance. From these findings, we clarified the Fundamental Process of the formation of bulk heterojunctions and that drying rate control is an effective method for optimizing the morphology and performance.
