55 research outputs found
Coupled-mode equations and gap solitons in a two-dimensional nonlinear elliptic problem with a separable periodic potential
We address a two-dimensional nonlinear elliptic problem with a
finite-amplitude periodic potential. For a class of separable symmetric
potentials, we study the bifurcation of the first band gap in the spectrum of
the linear Schr\"{o}dinger operator and the relevant coupled-mode equations to
describe this bifurcation. The coupled-mode equations are derived by the
rigorous analysis based on the Fourier--Bloch decomposition and the Implicit
Function Theorem in the space of bounded continuous functions vanishing at
infinity. Persistence of reversible localized solutions, called gap solitons,
beyond the coupled-mode equations is proved under a non-degeneracy assumption
on the kernel of the linearization operator. Various branches of reversible
localized solutions are classified numerically in the framework of the
coupled-mode equations and convergence of the approximation error is verified.
Error estimates on the time-dependent solutions of the Gross--Pitaevskii
equation and the coupled-mode equations are obtained for a finite-time
interval.Comment: 32 pages, 16 figure
The Lake Baikal neutrino experiment
We rewiew the present status of the Baikal Neutrino Project and present the
results of a search for high energy neutrinos with the detector intermediate
stage NT-96.Comment: 3 pages, 2 figures, to appear in the Proceedings of Sixth
International Workshop on Topics in Astroparticle and Underground Physics
(TAUP99), September 6-10, 1999, Pais, Franc
Local fluctuations in quantum critical metals
We show that spatially local, yet low-energy, fluctuations can play an
essential role in the physics of strongly correlated electron systems tuned to
a quantum critical point. A detailed microscopic analysis of the Kondo lattice
model is carried out within an extended dynamical mean-field approach. The
correlation functions for the lattice model are calculated through a
self-consistent Bose-Fermi Kondo problem, in which a local moment is coupled
both to a fermionic bath and to a bosonic bath (a fluctuating magnetic field).
A renormalization-group treatment of this impurity problem--perturbative in
, where is an exponent characterizing the spectrum
of the bosonic bath--shows that competition between the two couplings can drive
the local-moment fluctuations critical. As a result, two distinct types of
quantum critical point emerge in the Kondo lattice, one being of the usual
spin-density-wave type, the other ``locally critical.'' Near the locally
critical point, the dynamical spin susceptibility exhibits scaling
with a fractional exponent. While the spin-density-wave critical point is
Gaussian, the locally critical point is an interacting fixed point at which
long-wavelength and spatially local critical modes coexist. A Ginzburg-Landau
description for the locally critical point is discussed. It is argued that
these results are robust, that local criticality provides a natural description
of the quantum critical behavior seen in a number of heavy-fermion metals, and
that this picture may also be relevant to other strongly correlated metals.Comment: 20 pages, 12 figures; typos in figure 3 and in the main text
corrected, version as publishe
High-precision limits on and mixing from diboson production using the full LHC Run 2 ATLAS data set
The full ATLAS RunΒ 2 data set with time-integrated luminosity of in the diboson channels in hadronic final states is used to probe a simple model with an extended gauge sector (EGM), proposed by Altarelli et al., and often taken as a convenient benchmark by experimentalists. This model accommodates new charged and neutral vector bosons with modified trilinear Standard Model gauge couplings, decaying into electroweak gauge boson pairs WZ or WW, where W/Z decay hadronically. Exclusion limits at the 95% CL on the and resonance production cross section times branching ratio to electroweak gauge boson pairs in the mass range of 1β5 TeV are here converted to constraints on Wβ and Zβ mixing parameters and masses for the EGM. We present exclusion regions on the parameter space of the and by using the full RunΒ 2 data set comprised of pp collisions at and recorded by the ATLAS detector at the CERN LHC. The obtained exclusion regions are significantly extended compared to those obtained from the previous analysis performed with Tevatron data as well as with LHC data collected at 7 and 8 TeV in RunΒ 1 and are the most stringent bounds to date.The full ATLAS Run 2 data set with time-integrated luminosity of 139 fb in the diboson channels in hadronic final states is used to probe a simple model with an extended gauge sector (EGM), proposed by Altarelli et al., and often taken as a convenient benchmark by experimentalists. This model accommodates new charged and neutral vector bosons with modified trilinear Standard Model gauge couplings, decaying into electroweak gauge boson pairs or , where / decay hadronically. Exclusion limits at the 95% C.L. on the and resonance production cross section times branching ratio to electroweak gauge boson pairs in the mass range of 1 - 5 TeV are here converted to constraints on - and - mixing parameters and masses for the EGM. We present exclusion regions on the parameter space of the and by using the full Run 2 data set comprised of collisions at TeV and recorded by the ATLAS detector at the CERN LHC. The obtained exclusion regions are significantly extended compared to those obtained from the previous analysis performed with Tevatron data as well as with LHC data collected at 7 and 8 TeV in Run 1 and are the most stringent bounds to date
ΠΡΠ΅Π΄ΠΈΠΊΡΠΎΡΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΎΡΡΠ΅ΠΎΠΏΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΡ ΡΠ΅Ρ Π½ΠΈΠΊ Π² ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΠΎΠΌ Π»Π΅ΡΠ΅Π½ΠΈΠΈ Ρ ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π±Π΅ΡΠΊΠ°ΠΌΠ΅Π½Π½ΠΎΠ³ΠΎ Ρ ΠΎΠ»Π΅ΡΠΈΡΡΠΈΡΠ° Ρ ΠΎΡΠΈΡΠ΅ΡΠΎΠ² Π·Π°ΠΏΠ°ΡΠ°
The effectiveness of osteopathic techniques in complex treatment of patients with chronic acalculous cholecystitis was analyzed based on the results of direct and remote observations. The study was conducted on two groups of reserve soldiers for 54 people in each. The experimental group received osteopathic treatment instead of a massage on the background of standard therapy. Biochemical indices of blood and bile were compared, as well as pathobiomechanical disorders of organs of the subdiaphragmatic space. Estimation of predictors for the effectiveness of osteopathic treatment was carried out using dispersion, correlation and regression analyzes on the Statistica v 7.0 software package (Statsoft).ΠΡΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π° ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΎΡΡΠ΅ΠΎΠΏΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ΅Ρ
Π½ΠΈΠΊ Π² ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΠΎΠΌ Π»Π΅ΡΠ΅Π½ΠΈΠΈ Π±ΠΎΠ»ΡΠ½ΡΡ
Ρ
ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΈΠΌ Π±Π΅ΡΠΊΠ°ΠΌΠ΅Π½Π½ΡΠΌ Ρ
ΠΎΠ»Π΅ΡΠΈΡΡΠΈΡΠΎΠΌ ΠΏΠΎ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ°ΠΌ Π½Π΅ΠΏΠΎΡΡΠ΅Π΄ΡΡΠ²Π΅Π½Π½ΡΡ
ΠΈ ΠΎΡΠ΄Π°Π»Π΅Π½Π½ΡΡ
Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΠΉ. ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΎ Π½Π° Π΄Π²ΡΡ
Π³ΡΡΠΏΠΏΠ°Ρ
Π²ΠΎΠ΅Π½Π½ΠΎΡΠ»ΡΠΆΠ°ΡΠΈΡ
Π·Π°ΠΏΠ°ΡΠ° ΠΏΠΎ 54 ΡΠ΅Π»ΠΎΠ²Π΅ΠΊΠ° Π² ΠΊΠ°ΠΆΠ΄ΠΎΠΉ. ΠΠΏΡΡΠ½Π°Ρ Π³ΡΡΠΏΠΏΠ° ΠΏΠΎΠ»ΡΡΠ°Π»Π° Π½Π° ΡΠΎΠ½Π΅ ΡΡΠ°Π½Π΄Π°ΡΡΠ½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ Π²ΠΌΠ΅ΡΡΠΎ ΠΌΠ°ΡΡΠ°ΠΆΠ° ΠΎΡΡΠ΅ΠΎΠΏΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π»Π΅ΡΠ΅Π½ΠΈΠ΅. Π‘ΡΠ°Π²Π½ΠΈΠ²Π°Π»ΠΈΡΡ Π±ΠΈΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΠΈ ΠΊΡΠΎΠ²ΠΈ ΠΈ ΠΆΠ΅Π»ΡΠΈ, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΏΠ°ΡΠΎΠ±ΠΈΠΎΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π½Π°ΡΡΡΠ΅Π½ΠΈΡ ΠΎΡΠ³Π°Π½ΠΎΠ² ΠΏΠΎΠ΄Π΄ΠΈΠ°ΡΡΠ°Π³ΠΌΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΠΎΡΡΡΠ°Π½ΡΡΠ²Π°. ΠΡΠ΅Π½ΠΊΠ° ΠΏΡΠ΅Π΄ΠΈΠΊΡΠΎΡΠΎΠ² ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΎΡΡΠ΅ΠΎΠΏΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»Π°ΡΡ Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ΠΌ Π΄ΠΈΡΠΏΠ΅ΡΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ, ΠΊΠΎΡΡΠ΅Π»ΡΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΈ ΡΠ΅Π³ΡΠ΅ΡΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·ΠΎΠ² Π½Π° ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½ΠΎΠΌ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ΅ Statistica v 7.0 (Statsoft)
Carbonate reservoirs of subsalt deposits of the Caspian syneclise
The Caspian syneclise is one of the most promising hydrocarbon regions in Russia and Kazakhstan, which is confirmed by the discovery in recent years of large oil and gas fields within its borders. The presence in the Caspian syneclise at several stratigraphic levels of clay-carbonate deposits enriched with dispersed organic matter, a sufficiently high degree of their catagenetic transformation, the passage of the so-called Β«oil windowΒ» β all indicates a favorable situation for the generation of hydrocarbons in the region under consideration. The spread of possible accumulations of oil and gas in the subsalt sediments of the syneclise is mainly controlled by the quality of the reservoirs and impermeable layers. The proposed article illustrates the authorsβ attempt to create a generalized model for the formation of subsalt strata and to develop a scheme for the interrelationship between the processes of accumulation of carbonate sediments and their hydrocarbon productivity. The application of the obtained results to the practice of oil and gas prospecting can be of great importance, since the evaluation of the hydrocarbon productivity of the subsoil is impossible without the prediction of the spatial distribution of differentfacial deposits playing the role of accumulating and preserving strata. The revealed regularities of the space-time relationships of the formation of the main elements of natural reservoirs responsible for the oil and gas content in the subsalt sediments can serve to some extent as a base for the growth of hydrocarbon reserves, which is so necessary for the Caspian region
Sedimentation-capacity model of the subsalt deposits of the Southern Urals and adjoining territories
The junction zone of the Caspian syneclise, the Russian Plate and the Pre-Ural trough is characterized by a complex structure. It has been studied in some detail during large-scale geological, geophysical, and drilling operations in the search for mineral deposits. Subsalt deposits are associated with the main prospects for the growth of hydrocarbon reserves in this region. This makes it important to rethink the available data and conduct scientific analysis to identify patterns of formation of sedimentary complexes and an integrated assessment of their possible hydrocarbon productivity by means of sedimentation modeling. The structure and history of the formation of five large sedimentary complexes: the Ordovician-Lower Devonian, the Central Middle Devonian, the Frasnian-Tournaisian, the Visean-Upper Carboniferous, and the Permian are considered in detail. For each complex, a structural-formational position and sedimentation conditions are determined, which should determine the hydrocarbon productivity of local objects. The revealed relationship between the conditions of carbonate sediments accumulation and their potential reservoir properties served as the basis for forecasting the productivity of regional natural reservoirs. The paper presents a generalized model of the formation of subsalt strata and the forecast of the spatial distribution of different facies deposits, which play the role of accumulating and preserving strata. The results obtained are applicable in the practice of oil and gas exploration in the regio
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