851 research outputs found
Observations of Oscillating Cavitation on a Flat Plate Hydrofoil
An experimental investigation was made to clarify the characteristics of oscillating cavitation on a flat plate hydrofoil in a water tunnel. Dynamic the behavior of oscillating cavitation is discussed from the unsteady pressure measurements at the upstream of the blade and the visual observations of cavitation phenomena using high-speed video recording. It was found that the mean cavity length characterizes the fundamental characteristics of cavity oscillation. The cavity oscillations are categorized into two types, i.e. the transitional cavity oscillation and the partial cavity oscillation
Searching for Radio Pulsars in 3EG Sources at Urumqi Observatory
Since mid-2005, a pulsar searching system has been operating at 18 cm on the
25-m radio telescope of Urumqi Observatory. Test observations on known pulsars
show that the system can perform the intended task. The prospect of using this
system to observe 3EG sources and other target searching tasks is discussed.Comment: a training project about MSc thesi
Quark Confinement Physics from Quantum Chromodynamics
We show the construction of the dual superconducting theory for the
confinement mechanism from QCD in the maximally abelian (MA) gauge using the
lattice QCD Monte Carlo simulation. We find that essence of infrared abelian
dominance is naturally understood with the off-diagonal gluon mass induced by the MA gauge fixing. In the MA gauge, the
off-diagonal gluon amplitude is forced to be small, and the off-diagonal gluon
phase tends to be random. As the mathematical origin of abelian dominance for
confinement, we demonstrate that the strong randomness of the off-diagonal
gluon phase leads to abelian dominance for the string tension. In the MA gauge,
there appears the macroscopic network of the monopole world-line covering the
whole system. We investigate the monopole-current system in the MA gauge by
analyzing the dual gluon field . We evaluate the dual gluon mass as 0.5GeV in the infrared region, which is the lattice-QCD evidence of
the dual Higgs mechanism by monopole condensation. Owing to infrared abelian
dominance and infrared monopole condensation, QCD in the MA gauge is
describable with the dual Ginzburg-Landau theory.Comment: Invited talk given at KEK-Tanashi International Symposium on Physics
of Hadrons and Nuclei, Tokyo, Japan, 14-17 Dec 199
Expression and clinical significance of erb-B receptor family in hepatocellular carcinoma
In order to elucidate the clinical significance of the erbB family, epidermal growth factor receptor (EGF-R), c-erbB-2, c-erbB-3 and c-erbB-4 in hepatocellular carcinoma (HCC), we investigated the expression of these proteins by means of immunohistochemistry for HCC as well as adjacent noncancerous lesions. EGF-R was expressed in 68% of the HCC examined and showed correlation with the proliferating activity, stage, intrahepatic metastasis and carcinoma differentiation. c-erbB-2 was expressed in only 21% of the cases and showed no relationships with the clinicopathological parameters. c-erbB-3 protein was observed in 84% of the HCC and 38.1% of the noncancerous lesions. Its expression in HCC was equal to or greater than noncancerous lesions in 90.5% of the cases, and was related to the stage, portal invasion, cell proliferating activity, tumour size, intrahepatic metastasis and carcinoma differentiation. c-erbB-4 protein was expressed in 61.0% of HCC and in as much as 86.1% of the noncancerous lesions. Unlike the expression of c-erbB-3, that of c-erbB-4 in HCC was less than that of the adjacent noncancerous lesions in 51.2% of the cases. No statistical significance could be established between this protein expression in HCC and clinicopathological features. EGF-R and c-erbB-3 affected disease-free survival, but were not recognized as independent prognostic factors by multivariate analysis. The present study suggests that, of the four receptors, EGF-R and c-erbB-3 play important roles in the progression of HCC. © 2001 Cancer Research Campaign www.bjcancer.co
Infrared Abelian Dominance and Dual Higgs Mechanism in Maximally Abelian Gauge
We study infrared abelian dominance and the dual Higgs mechanism in the
maximally abelian (MA) gauge using the lattice QCD Monte Carlo simulation. In
the MA gauge, the off-diagonal gluon phase tends to be random, and the
off-diagonal gluon acquires the effective mass as 1.2 GeV. From the monopole current in the MA gauge, we extract the dual
gluon field and estimate the dual gluon mass as 0.5 GeV.
The QCD-monopole structure is also investigated in terms of off-diagonal
gluons. From the lattice QCD in the MA gauge, the dual Ginzburg-Landau (DGL)
theory can be constructed as a realistic infrared effective theory based on
QCD.Comment: Talk given at 17th International Symposium on Lattice Field Theory
(LATTICE 99), Pisa, Italy, 29 Jun - 3 Jul 199
Flux tube dynamics in the dual superconductor
We study plasma oscillations in a flux tube of the dual superconductor model
of 't Hooft and Mandelstam. A magnetic condensate is coupled to an
electromagnetic field by its dual vector potential, and fixed electric charges
set up a flux tube. An electrically charged fluid (a quark plasma) flows in the
tube and screens the fixed charges via plasma oscillations. We investigate both
Type I and Type II superconductors, with plasma frequencies both above and
below the threshold for radiation into the Higgs vacuum. We find strong
radiation of electric flux into the superconductor in all regimes, and argue
that this invalidates the use of the simplest dual superconductor model for
dynamical problems.Comment: 25 pages Revtex with 11 EPS figure
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