175 research outputs found
Photoelectrochemical Reactions at an Anthracene Cathode
Investigation of the peculiarities of the photoconductivity of
an anthracene cathode in the redox system iodine-iodide has supplied
information on the kinetics of photoelectrochemical reactions
injecting holes into anthracene. The effect of the surface coverage
of anthracene with adsorbed iodine, the dielectric constant of the
solvent, and of the energy of exciting photons on the photoconductivity
of an anthracene cathode has been studied. It is shown
that at photon energies from 3.8 to 5.0 eV, greater than the forbidden
zone width, the conduction band electrons participate in the
iodine reduction reaction. In the spectral region of singlet absorption
of anthracene, excitons participate in the electrochemical charge
separation reaction. In the case of contact with a polar solvent,
excitons break up at the surface levels formed by adsorbed iodine.
In the case of contact with a weakly-polar solvent, excitation is
transferred to adsorbed iodine. In the spectral region of weak
optical absorption of anthracene, iodine particles excited directly
by the light that had passed through the crystal participate in
the reaction
ΠΠ΅ΡΠΎΠ΄Ρ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡ ΠΈ ΠΈΡ ΡΠ°Π·ΠΌΠ΅ΡΠ½ΠΎ-ΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΡΠ΅ ΡΠΈΠ·ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΡ
The varieties of the methods of nanoparicles synthesis are discussed in this review. Wet and dry chemistry processes, pulse sonoelectrochemistry, methods with use of supercritical CO2, and far from equilibrium systems of two liquids are considered and compared.Possible role of dissipative phenomena during the processes of new nanoparticles creation is under special attention.ΠΠ°ΡΡΠΎΡΡΠΈΠΉ ΠΎΠ±Π·ΠΎΡ ΠΏΠΎΡΠ²ΡΡΠ΅Π½ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡ. Π Π°ΡΡΠΌΠΎΡΡΠ΅Π½Ρ ΠΌΠ΅ΡΠΎΠ΄Ρ Β«ΠΌΠΎΠΊΡΠΎΠΉΒ» ΠΈ Β«ΡΡΡ
ΠΎΠΉΒ» Ρ
ΠΈΠΌΠΈΠΈ, ΡΠΎΠ½ΠΎΡΠ»Π΅ΠΊΡΡΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΌΠ΅ΡΠΎΠ΄, ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΠ΅ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡ Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΡΠ²Π΅ΡΡ
ΠΊΡΠΈΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π΄ΠΈΠΎΠΊΡΠΈΠ΄Π° ΡΠ³Π»Π΅ΡΠΎΠ΄Π°, Π³ΡΠ°Π½ΠΈΡΡ Π΄Π²ΡΡ
ΠΆΠΈΠ΄ΠΊΠΎΡΡΠ΅ΠΉ ΠΈ Π΄Ρ. ΠΠ±ΡΡΠΆΠ΄Π°Π΅ΡΡΡ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΠ΅ Π²Π»ΠΈΡΠ½ΠΈΠ΅ Π΄ΠΈΡΡΠΈΠΏΠ°ΡΠΈΠ²Π½ΡΡ
ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ² Π² ΡΡΠ΅Π΄Π΅, Π³Π΄Π΅ ΡΠΎΠΆΠ΄Π°ΡΡΡΡ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡΡ, Π½Π° ΠΈΡ
ΡΠΈΠ·ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΡ
Enhancing Resource Management through Prediction-based Policies
Task-based programming models are emerging as a promising alternative to make
the most of multi-/many-core systems. These programming models rely on runtime
systems, and their goal is to improve application performance by properly
scheduling application tasks to cores. Additionally, these runtime systems
offer policies to cope with application phases that lack in parallelism to fill
all cores. However, these policies are usually static and favor either
performance or energy efficiency. In this paper, we have extended a task-based
runtime system with a lightweight monitoring and prediction infrastructure that
dynamically predicts the optimal number of cores required for each application
phase, thus improving both performance and energy efficiency. Through the
execution of several benchmarks in multi-/many-core systems, we show that our
prediction-based policies have competitive performance while improving energy
efficiency when compared to state of the art policies.Comment: Postprint submitted and published at Euro-Par2020: International
European Conference on Parallel and Distributed Computing (Springer)
(https://link.springer.com/chapter/10.1007%2F978-3-030-57675-2_31
Enhancement of the upper critical field by nonmagnetic impurities in dirty two-gap superconductors
Quasiclassic Uzadel equations for two-band superconductors in the dirty limit
with the account of both intraband and interband scattering by nonmagnetic
impurities are derived for any anisotropic Fermi surface. From these equations
the Ginzburg-Landau equations, and the critical temperature are obtained.
An equation for the upper critical field, which determines both the temperature
dependence of and the orientational dependence of
as a function of the angle between and the c-axis is
obtained. It is shown that the shape of the curve essentially
depends on the ratio of the intraband electron diffusivities and ,
and can be very different from the standard one-gap dirty limit theory. In
particular, the value can considerably exceed ,
which can have important consequences for applications of . A scaling
relation is proposed which enables one to obtain the angular dependence of
from the equation for at . It is shown
that, depending on the relation between and , the ratio of the upper
critical field for and can both increase and decrease as the temperature decreases. Implications
of the obtained results for are discussed
Observation of narrow baryon resonance decaying into in pA-interactions at with SVD-2 setup
SVD-2 experiment data have been analyzed to search for an exotic baryon
state, the -baryon, in a decay mode at on IHEP
accelerator. The reaction with a limited multiplicity was
used in the analysis. The invariant mass spectrum shows a resonant
structure with and . The statistical significance of this peak was estimated to be of . The mass and width of the resonance is compatible with the recently
reported - baryon with positive strangeness which was predicted as an
exotic pentaquark () baryon state. The total cross section for
production in pN-interactions for was estimated to be
and no essential deviation from A-dependence for inelastic
events was found.Comment: 8 pages, 7 figures, To be submitted to Yadernaya Fizika. v3-v5 - Some
references added, minor typos correcte
Π Π°Π·ΡΠ°Π±ΠΎΡΠΊΠ° ΠΌΠ΅ΡΠΎΠ΄Π° ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ pd - ΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΡ ΡΠ°ΡΡΠΈΡ Π΄Π»Ρ ΠΏΠΎΡΠ»Π΅Π΄ΡΡΡΠ΅Π³ΠΎ ΡΠΈΠ½ΡΠ΅Π·Π° ΡΠ»Π΅ΠΊΡΡΠΎΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°ΡΠΎΡΠΎΠ²
Platinum metals and their compounds are now widely used as catalysts for water electrolysis and fuel cells. We propose a new approach to the synthesis of nanoparticles. As model experiment we realized synthesis of palladium diacetate nanoparticles of controlled size. As special condition for new phase grow was chosen far from equilibrium boundary between two liquids [2]. Under this condition gradient of chemical potential the water - tetrahydrofuran (THF) interface was a powerful regulating factor of the palladium diacetate (II) particle size.ΠΠΏΠΈΡΠ°Π½ ΠΌΠ΅ΡΠΎΠ΄ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ Π½Π°Π½ΠΎΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² Π² Π½Π΅ΡΠ°Π²Π½ΠΎΠ²Π΅ΡΠ½ΠΎΠΌ ΠΏΠ΅ΡΠ΅Ρ
ΠΎΠ΄Π½ΠΎΠΌ ΡΠ»ΠΎΠ΅, Π²ΠΎΠ·Π½ΠΈΠΊΠ°ΡΡΠ΅ΠΌ ΠΏΡΠΈ ΠΏΡΠΈΠ²Π΅Π΄Π΅Π½ΠΈΠΈ Π² ΠΊΠΎΠ½ΡΠ°ΠΊΡ Π΄Π²ΡΡ
ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΏΠΎ ΡΠ²ΠΎΠ΅ΠΉ Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΡΠΈΡΠΎΠ΄Π΅ ΡΠΌΠ΅ΡΠΈΠ²Π°ΡΡΠΈΡ
ΡΡ ΠΆΠΈΠ΄ΠΊΠΎΡΡΠ΅ΠΉ. ΠΠ΅ΡΠΎΠ΄ Π°ΠΏΡΠΎΠ±ΠΈΡΠΎΠ²Π°Π½ Π΄Π»Ρ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ Pd-ΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΡ
Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡ ΠΊΠΎΠ½ΡΡΠΎΠ»ΠΈΡΡΠ΅ΠΌΠΎΠ³ΠΎ ΡΠ°Π·ΠΌΠ΅ΡΠ°, ΠΊΠΎΡΠΎΡΡΠ΅ Π±ΡΠ΄ΡΡ Π² Π΄Π°Π»ΡΠ½Π΅ΠΉΡΠ΅ΠΌ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½Ρ Π΄Π»Ρ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ ΡΠ»Π΅ΠΊΡΡΠΎΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°ΡΠΎΡΠΎΠ². ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π½ΡΠΉ ΠΌΠ΅ΡΠΎΠ΄ Π½Π΅ ΠΏΡΠ΅Π΄ΠΏΠΎΠ»Π°Π³Π°Π΅Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠ½ΠΎ-Π°ΠΊΡΠΈΠ²Π½ΡΡ
Π΄ΠΎΠ±Π°Π²ΠΎΠΊ, ΠΌΠΎΠ΄ΠΈΡΠΈΡΠΈΡΡΡΡΠΈΡ
ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΡ, ΡΡΠΎ ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΊΠ»ΡΡΠ΅Π²ΡΠΌ ΠΌΠΎΠΌΠ΅Π½ΡΠΎΠΌ Π² ΠΏΡΠΎΡΠ΅ΡΡΠ°Ρ
ΡΠΈΠ½ΡΠ΅Π·Π° ΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°ΡΠΎΡΠΎΠ². Π Π°ΡΡΠΌΠΎΡΡΠ΅Π½ΠΎ Π²Π»ΠΈΡΠ½ΠΈΠ΅ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΡΠ°ΠΊΡΠΎΡΠΎΠ² Π½Π° ΡΠ°Π·ΠΌΠ΅Ρ ΡΠ°ΡΡΠΈΡ Π΄ΠΈΠ°ΡΠ΅ΡΠ°ΡΠ° ΠΏΠ°Π»Π»Π°Π΄ΠΈΡ(II), ΠΎΠ±ΡΠ°Π·ΡΡΡΠΈΡ
ΡΡ Π² ΠΏΠ΅ΡΠ΅Ρ
ΠΎΠ΄Π½ΠΎΠΌ ΡΠ»ΠΎΠ΅ Π½Π° Π³ΡΠ°Π½ΠΈΡΠ΅ ΡΠ°Π·Π΄Π΅Π»Π° Π²ΠΎΠ΄Π° - ΡΠ΅ΡΡΠ°Π³ΠΈΠ΄ΡΠΎΡΡΡΠ°Π½ (Π’ΠΠ€)
Reorganization of the nuclear lamina and cytoskeleton in adipogenesis
A thorough understanding of fat cell biology is necessary to counter the epidemic of obesity. Although molecular pathways governing adipogenesis are well delineated, the structure of the nuclear lamina and nuclear-cytoskeleton junction in this process are not. The identification of the βlinker of nucleus and cytoskeletonβ (LINC) complex made us consider a role for the nuclear lamina in adipose conversion. We herein focused on the structure of the nuclear lamina and its coupling to the vimentin network, which forms a cage-like structure surrounding individual lipid droplets in mature adipocytes. Analysis of a mouse and human model system for fat cell differentiation showed fragmentation of the nuclear lamina and subsequent loss of lamins A, C, B1 and emerin at the nuclear rim, which coincides with reorganization of the nesprin-3/plectin/vimentin complex into a network lining lipid droplets. Upon 18Β days of fat cell differentiation, the fraction of adipocytes expressing lamins A, C and B1 at the nuclear rim increased, though overall lamin A/C protein levels were low. Lamin B2 remained at the nuclear rim throughout fat cell differentiation. Light and electron microscopy of a subcutaneous adipose tissue specimen showed striking indentations of the nucleus by lipid droplets, suggestive for an increased plasticity of the nucleus due to profound reorganization of the cellular infrastructure. This dynamic reorganization of the nuclear lamina in adipogenesis is an important finding that may open up new venues for research in and treatment of obesity and nuclear lamina-associated lipodystrophy
The Function of Cortactin in the Clustering of Acetylcholine Receptors at the Vertebrate Neuromuscular Junction
Background: Postsynaptic enrichment of acetylcholine receptors (AChRs) at the vertebrate neuromuscular junction (NMJ) depends on the activation of the muscle receptor tyrosine MuSK by neural agrin. Agrin-stimulation of MuSK is known to initiate an intracellular signaling cascade that leads to the clustering of AChRs in an actin polymerization-dependent manner, but the molecular steps which link MuSK activation to AChR aggregation remain incompletely defined. Methodology/Principal Findings: In this study we used biochemical, cell biological and molecular assays to investigate a possible role in AChR clustering of cortactin, a protein which is a tyrosine kinase substrate and a regulator of F-actin assembly and which has also been previously localized at AChR clustering sites. We report that cortactin was co-enriched at AChR clusters in situ with its target the Arp2/3 complex, which is a key stimulator of actin polymerization in cells. Cortactin was further preferentially tyrosine phosphorylated at AChR clustering sites and treatment of myotubes with agrin significantly enhanced the tyrosine phosphorylation of cortactin. Importantly, forced expression in myotubes of a tyrosine phosphorylation-defective cortactin mutant (but not wild-type cortactin) suppressed agrin-dependent AChR clustering, as did the reduction of endogenous cortactin levels using RNA interference, and introduction of the mutant cortactin into muscle cells potently inhibited synaptic AChR aggregation in response to innervation. Conclusion: Our results suggest a novel function of phosphorylation-dependent cortactin signaling downstream fro
CΠΈΠ½ΡΠ΅Π· Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡ Y(OH)CO3 ΠΈ Y2Π3 ΠΏΡΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠΈ ΠΆΠΈΠ΄ΠΊΠΈΡ ΠΌΠ΅ΠΆΡΠ°Π·Π½ΡΡ Π³ΡΠ°Π½ΠΈΡ ΠΈ Π΄Π°Π»ΡΠ½Π΅ΠΉΡΠ°Ρ ΠΌΠΎΠ΄ΠΈΡΠΈΠΊΠ°ΡΠΈΡ ΠΈΡ ΠΏΠΎΠ²Π΅ΡΡ Π½ΠΎΡΡΠΈ ΠΏΠ°Π»Π»Π°Π΄ΠΈΠ΅ΠΌ
The nano-composite materials with different morphology and structure, including yttrium basic carbonate or yttrium oxide and palladium metal are obtained. The optimal conditions for synthesis of stable nanoparticles of yttrium basic carbonate are defined. It is established that yttrium basic carbonate goes to the oxide at 900 Β°C. Samples of nanomaterials were characterized by transmission electron microscopy, infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy.ΠΠΎΠ»ΡΡΠ΅Π½Ρ Π½Π°Π½ΠΎΡΠ°Π·ΠΌΠ΅ΡΠ½ΡΠ΅ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΈΠΎΠ½Π½ΡΠ΅ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΠΎΠΉ ΠΌΠΎΡΡΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΈ ΡΡΡΡΠΊΡΡΡΡ, Π²ΠΊΠ»ΡΡΠ°-ΡΡΠΈΠ΅ Π³ΠΈΠ΄ΡΠΎΠΊΡΠΎΠΊΠ°ΡΠ±ΠΎΠ½Π°Ρ Π»ΠΈΠ±ΠΎ ΠΎΠΊΡΠΈΠ΄ ΠΈΡΡΡΠΈΡ ΠΈ ΠΌΠ΅ΡΠ°Π»Π»ΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΏΠ°Π»Π»Π°Π΄ΠΈΠΉ. ΠΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Ρ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΠ΅ ΡΡΠ»ΠΎΠ²ΠΈΡ ΡΠΈΠ½ΡΠ΅Π·Π° ΡΡΠ°Π±ΠΈΠ»ΡΠ½ΡΡ
Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡ Π³ΠΈΠ΄ΡΠΎΠΊΡΠΎΠΊΠ°ΡΠ±ΠΎΠ½Π°ΡΠ° ΠΈΡΡΡΠΈΡ, ΠΊΠΎΡΠΎΡΡΠ΅ ΠΏΡΠΈ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ΅ 900Β°Π‘ ΠΏΠ΅ΡΠ΅Ρ
ΠΎΠ΄ΡΡ Π² ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠΈΠΉ ΠΎΠΊΡΠΈΠ΄. ΠΠ±ΡΠ°Π·ΡΡ Π½Π°Π½ΠΎΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² ΠΎΡ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΠΎΠ²Π°Π½Ρ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΠΉ ΠΏΡΠΎΡΠ²Π΅ΡΠΈΠ²Π°ΡΡΠ΅ΠΉ ΠΌΠΈΠΊΡΠΎΡΠΊΠΎΠΏΠΈΠΈ, ΠΠ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΠΈΠΈ, ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΡΠ°Π·ΠΎΠ²ΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π°, ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ²ΡΠΊΠΎΠΉ ΡΠΎΡΠΎΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΠΉ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΠΈΠΈ
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