51 research outputs found
Electron Correlations in an Electron Bilayer at Finite Temperature: Landau Damping of the Acoustic Plasmon
We report angle-resolved Raman scattering observations of the temperature
dependent Landau damping of the acoustic plasmon in an electron bilayer system
realised in a GaAs double quantum well structure. Corresponding calculations of
the charge-density excitation spectrum of the electron bilayer using forms of
the random phase approximation (RPA), and the static local field formalism of
Singwi, Tosi, Land and Sj\"{o}lander (STLS) extended to incorporate non-zero
electron temperature and phenomenological damping, are also
presented. The STLS calculations include details of the temperature dependence
of the intra- and inter-layer local field factors and pair-correlation
functions. Good agreement between experiment and the various theories is
obtained for the acoustic plasmon energy and damping for , the Fermi temperature. However, contrary to current expectations,
all of the calculations show significant departures from our experimental data
for . From this, we go on to demonstrate
unambiguously that real local field factors fail to provide a physically
accurate description of exchange correlation behaviour in low dimensional
electron gases. Our results suggest instead that one must resort to a
{\em{dynamical}} local field theory, characterised by a {\em{complex}} field
factor to provide a more accurate description.Comment: 53 pages, 16 figure
Temperature dependence of the EPR linewidth of Yb3+ - ions in Y0.99Yb0.01Ba2Cu3OX compounds: Evidence for an anomaly near TC
Electron paramagnetic resonance experiments on doped Yb3+ ions in YBaCuO
compounds with different oxygen contents have been made. We have observed the
strong temperature dependence of the EPR linewidth in the all investigated
samples caused by the Raman processes of spin-lattice relaxation. The
spin-lattice relaxation rate anomaly revealed near TC in the superconducting
species can be assigned to the phonon density spectrum changesComment: 10 pages, 4 figures Renewed versio
Josephson array of mesoscopic objects. Modulation of system properties through the chemical potential
The phase diagram of a two-dimensional Josephson array of mesoscopic objects
is examined. Quantum fluctuations in both the modulus and phase of the
superconducting order parameter are taken into account within a lattice boson
Hubbard model. Modulating the average occupation number of the sites in
the system leads to changes in the state of the array, and the character of
these changes depends significantly on the region of the phase diagram being
examined. In the region where there are large quantum fluctuations in the phase
of the superconducting order parameter, variation of the chemical potential
causes oscillations with alternating superconducting (superfluid) and normal
states of the array. On the other hand, in the region where the bosons interact
weakly, the properties of the system depend monotonically on . Lowering
the temperature and increasing the particle interaction force lead to a
reduction in the width of the region of variation in within which the
system properties depend weakly on the average occupation number. The phase
diagram of the array is obtained by mapping this quantum system onto a
classical two-dimensional XY model with a renormalized Josephson coupling
constant and is consistent with our quantum Path-Integral Monte Carlo
calculations.Comment: 12 pages, 8 Postscript figure
ΠΠΎΡΠ»Π΅ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΎΠ½Π½Π°Ρ Π½Π°ΡΡΠΆΠ½Π°Ρ ΡΡΠ°Π½ΡΠ°Π±Π΄ΠΎΠΌΠΈΠ½Π°Π»ΡΠ½Π°Ρ Π³ΠΈΠΏΠ΅ΡΠ»ΠΈΠΌΡΠΎΡΠ΅Ρ (ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΠ΅)
Massive lymphorrhea can cause severe dysfunction of organs and systems and result in death due to loss of vital metabolites from the bodyAim. To demonstrate low efficacy of conservative therapy and late lymph duct ligation in continuous massive postoperative lymphorrhea.Results. We treated a patient with previous subtotal gastric resection with single-plane pancreatic resection, D2 lymph node dissection, peritoneal draining due to poorly differentiated carcinoma in the lower third of stomach and total hysterectomy who developed external lymphorrhea through peritoneal drainage tubes 3 days after surgery. A fat-rich diet, endolymphatic sodium etamsylate administration, and lymphatic duct ligation were not successful in terminating the lymph leakage. Despite the intensive care including extracorporeal detoxification, the multi-organ failure progressed and on day 28 after the surgery the patient was pronounced dead.Conclusion. Damage to lymph ducts and lymph nodes can be complicated by massive lymphorrhea. If the source of lymphorrhea can be identified, an urgent surgical intervention is warranted to stop the lymph leakage, as well as the restoration of homeostasis to replenish the lost metabolites and prevent death of the patient.ΠΠ°ΡΡΠΈΠ²Π½Π°Ρ Π»ΠΈΠΌΡΠΎΡΠ΅Ρ ΠΏΡΠΈΠ²ΠΎΠ΄ΠΈΡ ΠΊ ΡΡΠΆΠ΅Π»ΡΠΌ Π½Π°ΡΡΡΠ΅Π½ΠΈΡΠΌ ΡΡΠ½ΠΊΡΠΈΠΈ ΠΎΡΠ³Π°Π½ΠΎΠ² ΠΈ ΡΠΈΡΡΠ΅ΠΌ ΠΈ, Π²ΡΠ»Π΅Π΄ΡΡΠ²ΠΈΠ΅ ΡΠ΄Π°Π»Π΅Π½ΠΈΡ Ρ Π»ΠΈΠΌΡΠΎΠΉ ΠΈΠ· ΠΎΡΠ³Π°Π½ΠΈΠ·ΠΌΠ° ΠΆΠΈΠ·Π½Π΅Π½Π½ΠΎ Π²Π°ΠΆΠ½ΡΡ
ΠΌΠ΅ΡΠ°Π±ΠΎΠ»ΠΈΡΠΎΠ², ΠΌΠΎΠΆΠ΅Ρ Π·Π°ΠΊΠΎΠ½ΡΠΈΡΡΡΡ Π»Π΅ΡΠ°Π»ΡΠ½ΡΠΌ ΠΈΡΡ
ΠΎΠ΄ΠΎΠΌ.Π¦Π΅Π»Ρ. ΠΠΎΠΊΠ°Π·Π°ΡΡ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΡΡ Π½Π΅ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΊΠΎΠ½ΡΠ΅ΡΠ²Π°ΡΠΈΠ²Π½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ ΠΈ ΠΏΠΎΠ·Π΄Π½Π΅Π³ΠΎ Π»ΠΈΠ³ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π»ΠΈΠΌΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΡΠΎΡΠΎΠΊΠ° ΠΏΡΠΈ ΠΏΡΠΎΠ΄ΠΎΠ»ΠΆΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΠΈ ΠΌΠ°ΡΡΠΈΠ²Π½ΠΎΠΉ ΠΏΠΎΡΠ»Π΅ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ Π»ΠΈΠΌΡΠΎΡΠ΅Π΅.Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. ΠΠ°Π±Π»ΡΠ΄Π°Π»ΠΈ Π±ΠΎΠ»ΡΠ½ΡΡ ΠΏΠΎΡΠ»Π΅ Π΄ΠΈΡΡΠ°Π»ΡΠ½ΠΎΠΉ ΡΡΠ±ΡΠΎΡΠ°Π»ΡΠ½ΠΎΠΉ ΡΠ΅Π·Π΅ΠΊΡΠΈΠΈ ΠΆΠ΅Π»ΡΠ΄ΠΊΠ° Ρ ΠΏΠ»ΠΎΡΠΊΠΎΡΡΠ½ΠΎΠΉ ΡΠ΅Π·Π΅ΠΊΡΠΈΠ΅ΠΉ ΠΏΠΎΠ΄ΠΆΠ΅Π»ΡΠ΄ΠΎΡΠ½ΠΎΠΉ ΠΆΠ΅Π»Π΅Π·Ρ, Π»ΠΈΠΌΡΠΎΠ΄ΠΈΡΡΠ΅ΠΊΡΠΈΠΈ D2, Π΄ΡΠ΅Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π±ΡΡΡΠ½ΠΎΠΉ ΠΏΠΎΠ»ΠΎΡΡΠΈ ΠΏΠΎ ΠΏΠΎΠ²ΠΎΠ΄Ρ Π½ΠΈΠ·ΠΊΠΎΠ΄ΠΈΡΡΠ΅ΡΠ΅Π½ΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΡΠ°ΠΊΠ° Π½ΠΈΠΆΠ½Π΅ΠΉ ΡΡΠ΅ΡΠΈ ΠΆΠ΅Π»ΡΠ΄ΠΊΠ° (T4aNoMo) ΠΈ ΡΠΎΡΠ°Π»ΡΠ½ΠΎΠΉ Π³ΠΈΡΡΠ΅ΡΡΠΊΡΠΎΠΌΠΈΠΈ, Ρ ΠΊΠΎΡΠΎΡΠΎΠΉ ΡΠ΅ΡΠ΅Π· 3 Π΄Π½Ρ ΠΏΠΎΡΠ»Π΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ ΡΠ°Π·Π²ΠΈΠ»Π°ΡΡ Π½Π°ΡΡΠΆΠ½Π°Ρ Π»ΠΈΠΌΡΠΎΡΠ΅Ρ ΡΠ΅ΡΠ΅Π· Π΄ΡΠ΅Π½Π°ΠΆΠΈ Π² Π±ΡΡΡΠ½ΠΎΠΉ ΠΏΠΎΠ»ΠΎΡΡΠΈ. ΠΠΎΠ³Π°ΡΠ°Ρ ΠΆΠΈΡΠ°ΠΌΠΈ Π΄ΠΈΠ΅ΡΠ°, ΡΠ½Π΄ΠΎΠ»ΠΈΠΌΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π²Π²Π΅Π΄Π΅Π½ΠΈΠ΅ ΡΡΠ°ΠΌΠ·ΠΈΠ»Π°ΡΠ° Π½Π°ΡΡΠΈΡ, ΠΏΡΠΎΡΠΈΠ²Π°Π½ΠΈΠ΅ Π»ΠΈΠΌΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΡΠΎΡΠΎΠΊΠ° Π½Π΅ ΠΏΡΠΈΠ²Π΅Π»ΠΈ ΠΊ ΠΏΡΠ΅ΠΊΡΠ°ΡΠ΅Π½ΠΈΡ ΠΈΡΡΠ΅ΡΠ΅Π½ΠΈΡ Π»ΠΈΠΌΡΡ. ΠΠ΅ΡΠΌΠΎΡΡΡ Π½Π° ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠΌΡΡ ΠΈΠ½ΡΠ΅Π½ΡΠΈΠ½ΡΡ ΡΠ΅ΡΠ°ΠΏΠΈΡ, Π²ΠΊΠ»ΡΡΠ°Ρ ΠΌΠ΅ΡΠΎΠ΄Ρ ΡΠΊΡΡΡΠ°ΠΊΠΎΡΠΏΠΎΡΠ°Π»ΡΠ½ΠΎΠΉ Π΄Π΅ΡΠΎΠΊΡΠΈΠΊΠ°ΡΠΈΠΈ, ΠΏΡΠΎΠ³ΡΠ΅ΡΡΠΈΡΠΎΠ²Π°Π»ΠΈ ΠΏΡΠΎΡΠ²Π»Π΅Π½ΠΈΡ ΠΏΠΎΠ»ΠΈΠΎΡ-Π³Π°Π½Π½ΠΎΠΉ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΎΡΠ½ΠΎΡΡΠΈ ΠΈ Π½Π° 28-Π΅ ΡΡΡΠΊΠΈ ΠΏΠΎΡΠ»Π΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ ΠΊΠΎΠ½ΡΡΠ°ΡΠΈΡΠΎΠ²Π°Π»ΠΈ ΡΠΌΠ΅ΡΡΡ Π±ΠΎΠ»ΡΠ½ΠΎΠΉ.ΠΠ°ΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅. ΠΠΎΠ²ΡΠ΅ΠΆΠ΄Π΅Π½ΠΈΠ΅ Π»ΠΈΠΌΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠΎΡΡΠ΄ΠΎΠ² ΠΈ Π»ΠΈΠΌΡΠΎΡΠ·Π»ΠΎΠ² ΠΌΠΎΠΆΠ΅Ρ ΠΎΡΠ»ΠΎΠΆΠ½ΠΈΡΡΡΡ ΠΌΠ°ΡΡΠΈΠ²Π½ΠΎΠΉ Π»ΠΈΠΌΡΠΎΡΠ΅Π΅ΠΉ ΠΏΡΠΈ Π²ΡΡΠ²Π»Π΅Π½ΠΈΠΈ ΠΈΡΡΠΎΡΠ½ΠΈΠΊΠ° ΠΊΠΎΡΠΎΡΠΎΠΉ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎ ΠΊΠ°ΠΊ ΡΡΠΎΡΠ½ΠΎΠ΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠ²Π½ΠΎΠ΅ Π²ΠΌΠ΅ΡΠ°ΡΠ΅Π»ΡΡΡΠ²ΠΎ, Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½Π½ΠΎΠ΅ Π½Π° ΠΎΡΡΠ°Π½ΠΎΠ²ΠΊΡ Π»ΠΈΠΌΡΠΎΡΠ°Π³ΠΈΠΈ ΡΠ°ΠΊ ΠΈ ΠΊΠΎΡΡΠ΅ΠΊΡΠΈΡ Π³ΠΎΠΌΠ΅ΠΎΡΡΠ°Π·Π° Ρ ΡΠ΅Π»ΡΡ Π²ΠΎΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΡ ΠΏΠΎΡΠ΅ΡΡΠ½Π½ΡΡ
ΠΎΡΠ³Π°Π½ΠΈΠ·ΠΌΠΎΠΌ ΠΌΠ΅ΡΠ°Π±ΠΎΠ»ΠΈΡΠΎΠ² ΠΈ ΠΏΡΠ΅Π΄ΡΠΏΡΠ΅ΠΆΠ΄Π΅Π½ΠΈΡ Π»Π΅ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΈΡΡ
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