1,526 research outputs found
Робоча програма і методичні вказівки до самостійного вивчення дисципліни "Основи теорії транспорту"
Гірничовидобувна промисловість України набуває розвитку на базі без-
перервного використання досягнень науково-технічного прогресу, застосування
комплексної механізації та автоматизації всіх процесів виробництва, поліпшен-
ня якісних показників підприємств, підвищення продуктивності й безпеки пра-
ці.Гірничовидобувна промисловість України набуває розвитку на базі без-
перервного використання досягнень науково-технічного прогресу, застосування
комплексної механізації та автоматизації всіх процесів виробництва, поліпшен-
ня якісних показників підприємств, підвищення продуктивності й безпеки пра-
ці
Vortex Fluctuations in High-Tc Films: Flux Noise Spectrum and Complex Impedance
The flux noise spectrum and complex impedance for a 500 {\AA} thick YBCO film
are measured and compared with predictions for two dimensional vortex
fluctuations. It is verified that the complex impedance and the flux noise
spectra are proportional to each other, that the logarithm of the flux noise
spectra for different temperatures has a common tangent with slope , and that the amplitude of the noise decreases as , where is
the height above the film at which the magnetic flux is measured. A crossover
from normal to anomalous vortex diffusion is indicated by the measurements and
is discussed in terms of a two-dimensional decoupling.Comment: 5 pages including 4 figures in two columns, to appear in Phys. Rev.
Let
Bottom-quark fragmentation: comparing results from tuned event generators and resummed calculations
We study bottom-quark fragmentation in e+e- annihilation, top and Higgs decay
H -> b bbar, using Monte Carlo event generators, as well as calculations, based
on the formalism of perturbative fragmentation functions, which resum soft- and
collinear-radiation effects in the next-to-leading logarithmic approximation.
We consider the PYTHIA and HERWIG generators, and implement matrix-element
corrections to the parton shower simulation of the H -> b bbar process in
HERWIG. We tune the Kartvelishvili, string and cluster models to B-hadron data
from LEP and SLD, and present results in both x_B and moment spaces. The
B-hadron spectra yielded by HERWIG, PYTHIA and resummed calculations show small
discrepancies, which are due to the different approaches and models employed
and to the quality of the fits to the e+e- data.Comment: 22 pages, 11 colour figures. Minor changes in the text, published
versio
The isoquinoline PRL-295 increases the thermostability of Keap1 and disrupts its interaction with Nrf2
Transcription factor Nrf2 and its negative regulator Keap1 orchestrate a cytoprotective response against oxidative, metabolic, and inflammatory stress. Keap1 is a drug target, with several small molecules in drug development. Here, we show that the isoquinoline PRL-295 increased Keap1 thermostability in lysates from cells expressing fluorescently tagged Keap1. The thermostability of endogenous Keap1 also increased in intact cells and murine liver following PRL-295 treatment. Fluorescence Lifetime Imaging–Förster Resonance Energy Transfer (FLIM-FRET) experiments in cells co-expressing sfGFP-Nrf2 and Keap1-mCherry further showed that PRL-295 prolonged the donor fluorescence lifetime, indicating disruption of the Keap1-Nrf2 protein complex. Orally administered PRL-295 to mice activated the Nrf2transcriptional target NAD(P)H:quinone oxidoreductase 1 (NQO1) in liver and decreased the levels of plasma alanine aminotransferase and aspartate aminotransferase upon acetaminophen-induced hepatic injury. Thus, PRL-295 engages the Keap1 protein target in cells and in vivo, disrupting its interaction with Nrf2, leading to activation of Nrf2-dependent transcription and hepatocellular protection
The Current-Temperature Phase Diagram of Layered Superconductors
The behavior of clean layered superconductors in the presence of a finite
electric current and in zero-magnetic field behavior is addressed. The
structure of the current temperature phase diagram and the properties of each
of the four regions will be explained. We will discuss the expected current
voltage and resistance characteristics of each region as well as the effects of
finite size and weak disorder on the phase diagram. In addition, the reason for
which a weakly non-ohmic region exists above the transition temperature will be
explained.Comment: 8 pages (RevTeX), 4 encapsulated postscript figure
Re-evaluation of the LHC potential for the measurement of Mw
We present a study of the LHC sensitivity to the W boson mass based on
simulation studies. We find that both experimental and phenomenological sources
of systematic uncertainties can be strongly constrained with Z measurements:
the lineshape is robustly predicted, and its analysis provides an accurate
measurement of the detector resolution and absolute scale, while the
differential cross-section analysis absorbs most of the strong interaction
uncertainties. A sensitivity \delta Mw \sim 7 \MeV for each decay channel (W
--> e nu, W --> mu nu), and for an integrated luminosity of 10 fb-1, appears as
a reasonable goal
QCD Coherence and the Top Quark Asymmetry
Coherent QCD radiation in the hadroproduction of top quark pairs leads to a
forward--backward asymmetry that grows more negative with increasing transverse
momentum of the pair. This feature is present in Monte Carlo event generators
with coherent parton showering, even though the production process is treated
at leading order and has no intrinsic asymmetry before showering. In addition,
depending on the treatment of recoils, showering can produce a positive
contribution to the inclusive asymmetry. We explain the origin of these
features, compare them in fixed-order calculations and the Herwig++, Pythia and
Sherpa event generators, and discuss their implications.Comment: 28 pages, 11 figures, 2 table
Dynamic scaling for 2D superconductors, Josephson junction arrays and superfluids
The value of the dynamic critical exponent is studied for two-dimensional
superconducting, superfluid, and Josephson Junction array systems in zero
magnetic field via the Fisher-Fisher-Huse dynamic scaling. We find
, a relatively large value indicative of non-diffusive
dynamics. Universality of the scaling function is tested and confirmed for the
thinnest samples. We discuss the validity of the dynamic scaling analysis as
well as the previous studies of the Kosterlitz-Thouless-Berezinskii transition
in these systems, the results of which seem to be consistent with simple
diffusion (). Further studies are discussed and encouraged.Comment: 19 pages in two-column RevTex, 8 embedded EPS figure
Interactions, Distribution of Pinning Energies, and Transport in the Bose Glass Phase of Vortices in Superconductors
We study the ground state and low energy excitations of vortices pinned to
columnar defects in superconductors, taking into account the long--range
interaction between the fluxons. We consider the ``underfilled'' situation in
the Bose glass phase, where each flux line is attached to one of the defects,
while some pins remain unoccupied. By exploiting an analogy with disordered
semiconductors, we calculate the spatial configurations in the ground state, as
well as the distribution of pinning energies, using a zero--temperature Monte
Carlo algorithm minimizing the total energy with respect to all possible
one--vortex transfers. Intervortex repulsion leads to strong correlations
whenever the London penetration depth exceeds the fluxon spacing. A pronounced
peak appears in the static structure factor for low filling fractions . Interactions lead to a broad Coulomb gap in the distribution of
pinning energies near the chemical potential , separating
the occupied and empty pins. The vanishing of at leads to a
considerable reduction of variable--range hopping vortex transport by
correlated flux line pinning.Comment: 16 pages (twocolumn), revtex, 16 figures not appended, please contact
[email protected]
Anxiety and self-esteem as mediators of the relation between family communication and indecisiveness in adolescence
Abstract In this study, we explored the unique and common contributions of anxiety, self-esteem, and family communication on indecisiveness among adolescents. Three hundred and fifty pupils from 13 to 16 years of age completed selfreport
measures on indecisiveness, quality of family communication, trait anxiety, and self-esteem. The findings in this study showed that students\u2019 indecisiveness is predicted by family communication mediated by anxiety and self-esteem. These results have important implications for practice as it stresses the importance of
anxiety and self-esteem. Nevertheless, the counselors could also focus on enhancing
relationship-building skills by introducing the adolescents\u2019 career formation as an adolescent\u2013parent joint project.L\u2019anxie\ub4te\ub4 et l\u2019estime de soi comme me\ub4diateurs de la relation entre communication au sein de la famille et indecision chronique a` l\u2019adolescence.
Dans cette e\ub4tude, nous avons explore\ub4 les contributions uniques et communes de l\u2019anxiete\ub4, de l\u2019estime de soi et de la communication au sein de la famille sur l\u2019indecision chronique aupres d\u2019adolescents. Trois cent cinquante e\ub4le`ves a\u2c6ge\ub4s de 13 a` 16 ans ont rempli des mesures d\u2019auto-e\ub4valuation de l\u2019inde\ub4cision chronique, de la qualite\ub4 de la communication familiale, de l\u2019anxie\ub4te\ub4-trait et de l\u2019estime de soi. Les re\ub4sultats de cette e\ub4tude ont montre\ub4 que l\u2019inde\ub4cision des e\ub4tudiants est explique\ub4e par la communication au sein de la famille et que ce lien est me\ub4diatise\ub4 par l\u2019anxie\ub4te\ub4 et l\u2019estime de soi. Ces re\ub4sultats ont des implications importantes pour la pratique car ils soulignent l\u2019importance de l\u2019anxie\ub4te\ub4 et l\u2019estime de soi. Ne\ub4anmoins, les conseillers
pourraient e\ub4galement se concentrer sur l\u2019ame\ub4lioration des compe\ub4tences de
construction relationnelle en introduisant la formation professionnelle des adolescents
comme un projet conjoint adolescent-parent.Resumen. Ansiedad y Autoestima como Mediadores de la Relacio\ub4n entre
Comunicacio\ub4n Familiar e Indecisio\ub4n en la Adolescencia. En este estudio, exploramos
las contribuciones u\ub4nicas y comunes de la ansiedad, la autoestima y la
comunicacio\ub4n de familia en la indecisio\ub4n de los adolescentes. Tres y cientos
cincuenta alumnos entre los 13 y 16 an\u2dcos completaron auto-evaluaciones sobre la
indecisio\ub4n, la calidad de comunicacio\ub4n familiar, los rasgos de ansiedad y la autoestima.
Los resultados en este estudio muestran que la indecisio\ub4n en los estudiantes
es prevista por la comunicacio\ub4n familiar mediada por la ansiedad y la autoestima.
Estos resultados tiene importantes implicaciones para la practica ya que destacan la
importancia de la ansiedad y la autoestima. Sin embargo, los consejeros podr\u131\ub4an
tambie\ub4n focalizarse en el aumento de sus habilidades para construir relaciones
mediante la introduccio\ub4n de la formacio\ub4n profesional para adolescentes como un
proyecto conjunto del adolescente-padre.Angst und Selbstwertgefu\ua8 hl als Mediatoren der Beziehung
zwischen Kommunikation in der Familie und Unentschlossenheit in der
Adoleszenz. In dieser Studie untersuchten wir die spezifischen und gemeinsamen
Beitra\ua8ge von Angst, Selbstwertgefu\ua8hl und Kommunikation in der Familie auf Unentschlossenheit
unter Jugendlichen. Dreihundertfu\ua8nfzig Schu\ua8ler, zwischen 13 bis
16 Jahre alt, fu\ua8llten Skalen zur Unentschlossenheit, Qualita\ua8t der Kommunikation in
der Familie, A\ua8 ngstlichkeit und Selbstwertgefu\ua8hl aus. Die Ergebnisse dieser Studie
zeigten, dass Unentschlossenheit der Schu\ua8ler von Kommunikation in der Familie
vorhergesagt wird, vermittelt durch Angst und Selbstwertgefu\ua8 hl. Diese Ergebnisse
haben wichtige Implikationen fu\ua8r die Praxis, da sie die Bedeutung von Angst und
Selbstwertgefu\ua8hl hervorheben. Dennoch ko\ua8nnten sich die Beratungspersonen durch
die Einfu\ua8hrung der beruflichen Bildung der Jugendlichen als ein gemeinsames
Projekt von Jugendliche-Elternteil auch auf die Verbesserung der Fa\ua8higkeiten zum
Aufbau von Beziehungen konzentrieren
- …