Two-dimensional open quantum system in dissipative bosonic heat bath, external magnetic field, and two time-dependent electric fields.

Non-Markovian dynamics of a charged particle in a two-dimensional harmonic oscillator linearly coupled to a neutral bosonic heat bath is investigated in an external uniform magnetic field and two perpendicular time-dependent electric fields. The analytical expressions for the time-dependent and asymptotic angular momentum are derived for the Markovian and non-Markovian dynamics. The dependence of the angular momentum on the frequency of the electric field, cyclotron frequency, collective frequency, and anisotropy of the heat bath is studied.

Orbital diamagnetism of two-dimensional quantum systems in a dissipative environment: Non-Markovian effect and application to graphene.

The non-Markovian dynamics of a charged particle confined in the harmonic oscillator and linearly coupled to a neutral bosonic heat bath is investigated in the external uniform magnetic field. The analytical expressions are derived for the time-dependent and asymptotic orbital angular momenta. The transition from non-Markovian dynamics to Markovian dynamics and the transition from a confined charge particle to a free charge particle are considered.

Applicability of the absence of equilibrium in quantum system fully coupled to several fermionic and bosonic heat baths.

The time evolution of an occupation number is studied for a fermionic or bosonic oscillator linearly fully coupled to several fermionic and bosonic heat baths. The influence of the characteristics of thermal reservoirs of different statistics on the nonstationary population probability is analyzed at large times. Applications of the absence of equilibrium in such systems for creating a dynamic (nonstationary) memory storage are discussed.

Non-Markovian dynamics of quantum systems coupled with several mixed fermionic-bosonic heat baths.

For the fermionic or bosonic oscillator fully coupled to several heat baths with mixed statistics, the analytical expressions for the occupation numbers are derived within the non-Markovian quantum Langevin approach. Employing two or three heat baths and the Ohmic dissipation with Lorenzian cutoffs, the role of statistics of the system and heat baths in the dynamics of the system is studied.

Non-Markovian dynamics of fermionic and bosonic systems coupled to several heat baths.

Employing the fermionic and bosonic Hamiltonians for the collective oscillator linearly FC-coupled with several heat baths, the analytical expressions for the collective occupation number are derived within the non-Markovian quantum Langevin approach. The master equations for the occupation number of collective subsystem are derived and discussed. In the case of Ohmic dissipation with Lorenzian cutoffs, the possibility of reduction of the system with several heat baths to the system with one heat bath is analytically demonstrated.

Non-Markovian dynamics of an open quantum system with nonstationary coupling.

The spectral, dissipative, and statistical properties of the damped quantum oscillator are studied in the case of non-Markovian and nonstationary system-heat bath coupling. The dissipation of collective energy is shown to be slowed down, and the decoherence rate and entropy grow with modulation frequency.

Influence of external magnetic field on dynamics of open quantum systems.

The influence of an external magnetic field on the non-Markovian dynamics of an open two-dimensional quantum system is investigated. The fluctuations of collective coordinate and momentum and transport coefficients are studied for a charged harmonic oscillator linearly coupled to a neutral bosonic heat bath. It is shown that the dissipation of collective energy slows down with increasing strength of the external magnetic field.

[The influence of antisecretory agents on the antral gastric mucosa in patients with duodenal ulcer].

Changes in the antral gastric mucosa of patients with doudenal ulcer after a long-term administration of antisecretory agents were studied. The subjects were five patients with a different duration of the disease. The methods applied included light and electron microscopy of tissue samplings taken from the antral part of the stomach during the periods of exacerbation and remission.

Transport coefficients of a quantum system interacting with a squeezed heat bath.

The analytical expressions for the time-dependent friction and diffusion coefficients are presented for the case of coupling in coordinates between the collective subsystem and a squeezed heat bath. The effects of initial phase-sensitive and -insensitive correlations of the heat bath on the diffusion coefficients, fluctuations, and decoherence are studied. The interplay between friction and decoherence is discussed.

Non-Markovian dynamics of quantum systems. II. Decay rate, capture, and pure states.

On the basis of a master equation for the reduced density matrix of open quantum systems, we study the influence of time-dependent friction and diffusion coefficients on the decay rate from a potential well and the capture probability into a potential well. Taking into account the mixed diffusion coefficient Dqp, the quasistationary decay rates are compared with the analytically derived Kramers-type formulas for different temperatures and frictions. The diffusion coefficients supplying the purity of states are derived for a non-Markovian dynamics.

Non-Markovian dynamics of quantum systems. I. Formalism and transport coefficients.

Generalized Langevin equations and fluctuation-dissipation relations are derived for the case of a nonlinear non-Markovian noise. The explicit expressions for the time-dependent friction and diffusion coefficients are presented for the case of general and linear couplings in the coordinate and momentum between the collective harmonic oscillator and heat bath. The long-time tails of correlation functions are investigated in the low- and high-temperature regimes of dissipation for different couplings.

[Surface relief of peripheral blood erythrocytes in patient with schizophrenia (scanning electron microscopy data)].

Surface relief and configuration of peripheral blood erythrocytes were studied under a scanning electron microscope in 42 patients with paranoid schizophrenia during the active phase and remission. Control group consisted of 30 mentally and somatically healthy donors. The count of functionally intact biconcave discocytes was appreciably (p < 0.

[The continuity between the polyclinic and the surgical hospital in rendering specialized medical care to patients with chronic calculous cholecystitis].

A thorough clinical analysis of pains in the right hypochondrium was carried out in 880 patients. There were 80 men (the mean age 45 years) and 800 women (the mean age 40 years). Three groups of the symptom complexes were distinguished, pointing to: (a) dyskinesia of the gallbladder by the hypotonic type; (b) dyskinesia of the gallbladder by the hypertonic type; (c) chronic cholecystitis.

[Role of gastroduodenoscopy in improving the district physician's care of patients with choledochopancreatic diseases].

Analysis was made of records available in the disease histories of 270 patients who had referred to the district internist for pains in the epigastrium and right hypochondrium. In these patients, endoscopy of the upper alimentary tract revealed the indirect signs of the impairment of the choledochopancreatic organs without gross pathology of the gastric or duodenal mucosa. Endoscopy was performed during the first week after the patient had referred to the district internist.

[The effect of hypertonic saline solutions on water-salt metabolism in Brattleboro rats].

The role of antidiuretic hormone in the organism ability to resist against considerable salt shifts, was studied in Wistar (1st group) and Brattleboro rats--heterozygotes (2nd group). 5% NaCl solution was infused into animals' stomach (30-50-70-100 ml/kg). An increase in diuresis especially at 7-10% load, and a decrease in Na and K excretion occurred in Brattleboro rats.

[Integration of mechanisms regulating water-salt equilibrium during increasing water, salt, and volume loading].

The mechanism of integration of osmo- and volume-regulating systems after intake of 3, 5, 7, and 10% of body weight water, salt, and volume loads, was studied in adult rats. The changes of diuretic and ionuretic renal functions depended on the character and quantity of shifts caused in organism. The volume shift is the starting mechanism for stabilization of disturbed balance while the osmotic factor secures the final regulation of watersalt homeostasis.