ABSTRACT
We develop a theoretical description of nonadiabatic Josephson dynamics in superconducting junctions containing low energy quasiparticles. Within this approach we investigate the effects of midgap states in junctions of unconventional d-wave superconductors. We identify a reentrance effect in the transition between thermal activation and macroscopic quantum tunneling, and connect this phenomenon to the experimental observations in Phys. Rev. Lett. 94, 087003 (2005). It is also shown that nonlinear Josephson dynamics can be defined by resonant interaction with midgap states reminiscent of nonlinear optical phenomena in media of two-level atoms.
ABSTRACT
We report the observation of photon generation in a microwave cavity with a time-dependent boundary condition. Our system is a microfabricated quarter-wave coplanar waveguide cavity. The electrical length of the cavity is varied by using the tunable inductance of a superconducting quantum interference device. It is measured at a temperature significantly less than the resonance frequency. When the length is modulated at approximately twice the static resonance frequency, spontaneous parametric oscillations of the cavity field are observed. Time-resolved measurements of the dynamical state of the cavity show multiple stable states. The behavior is well described by theory. Our results may be considered a preliminary step towards demonstrating the dynamical Casimir effect.
ABSTRACT
The study of lipid fat acid content in condensate of expired air with the help of the gas liquid chromatography revealed the increased sum of polyunsaturated fatty acids (PUFA) in a large measure of increased content of arachidonic and linolic PUFA in children-residents of radioactive contaminated territories in comparison with children born by participants of liquidation of Chernobyl accident consequences. It is evidence of more active processes of lipid peroxidation and shift of the balance of fatty acids to the side of omega-6 family.
Subject(s)
Chernobyl Nuclear Accident , Fatty Acids/analysis , Lipid Peroxidation/radiation effects , Paternal Exposure/adverse effects , Pulmonary Surfactants/chemistry , Breath Tests , Child , Dose-Response Relationship, Radiation , Humans , Male , Radiation Monitoring , UkraineABSTRACT
We investigate the dynamics of a two-level Andreev bound state system in a transmissive quantum point contact embedded in an rf SQUID. Coherent coupling of the Andreev levels to the circulating supercurrent allows manipulation and readout of the level states. The two-level Hamiltonian for the Andreev levels is derived, and the effect of interaction with the quantum fluctuations of the induced flux is studied. We also consider an inductive coupling of qubits and discuss the relevant SQUID parameters for qubit operation and readout.
ABSTRACT
An ulcer disease classification, basing on the disease clinical course criteria and the local changes characteristics, is proposed. An adequate estimation of the patient state and optimal tactics of treatment are guaranteed by the diagnosis formulation using the classification.
Subject(s)
Peptic Ulcer/classification , Peptic Ulcer/diagnosis , Diagnosis, Differential , Duodenal Ulcer/diagnosis , Duodenitis/diagnosis , Gastritis/diagnosis , Humans , Peptic Ulcer Hemorrhage/diagnosis , Peptic Ulcer Perforation/diagnosis , Stomach Ulcer/diagnosis , Zollinger-Ellison Syndrome/diagnosisABSTRACT
The surgical treatment tactics of patients with perforative gastroduodenal ulcer was substantiated, basing on the complex analysis done. Radical intervention, mainly organ preserving one, constitutes the operation.
Subject(s)
Duodenal Ulcer/complications , Peptic Ulcer Perforation/surgery , Stomach Ulcer/complications , Humans , Peptic Ulcer Perforation/etiology , Recurrence , Vagotomy, Proximal GastricABSTRACT
Antioxidative effect of phospholipid complex from the sea organisms (preparation "Kalmofil") is observed comparatively with other phospholipid fractions of animal and plant origin. Most antioxidative action of the phospholipid complex from Mollusca (preparation "Kalmofil") on the nonenzymatic LPO reactions in vitro is established. Analogous fractions from different functional animal tissues have not such influence. Application of "Kalmofil" in vivo under experimental rat hepatitis provoked by CCl4 has a corrective effect on both nonenzymatic and Fe(2+)- and NADP.H-depending LPO reactions. This preparation decreases toxic influence of CCl4 and improves antioxidative system of rat hepatocytes.
