Condon domain phase diagram for silver

We present the Condon domain phase diagram for a silver single crystal measured in magnetic fields up to 28 T and temperatures down to 1.3 K. A standard ac method with a pickup coil system is used at low frequency for the measurements of the de Haas–van Alphen effect (dHvA). The transition point from the state of homogeneous magnetization to the inhomogeneous Condon domain state (CDS) is found as the point where a small irreversibility in the dHvA magnetization arises, as manifested by an extremely nonlinear response in the pickup voltage showing threshold character. The third harmonic content in the ac response is used to determine with high precision the CDS phase boundary. The experimentally determined Condon domain phase diagram is in good agreement with the theoretical prediction calculated by the standard Lifshitz–Kosevich formula

Giant parametric amplification of the nonlinear response in a single crystal of beryllium in a quantizing magnetic field

The nonlinear response to an ac magnetic field with and without parametric pumping was studied experimentally on a rod-like beryllium single crystal at low temperatures in a quantizing magnetic field applied parallel to the hexagonal axis. At low temperatures (≤ 3 K) giant parametric amplification of the nonlinear response is observed in narrow windows near de Haas– van Alphen (dHvA) beating antinodes where the amplitude of the magnetic oscillations is maximal. This effect is of threshold character with respect to the amplitude of the dHvA oscillations and occurs as a result of a diamagnetic phase transition of a strongly correlated electron gas into nonuniform state with formation of Condon domain structure. It is shown that the nonuniform phase appears periodically in a magnetic field. The components of rectified signal field reproduce the envelope of H–T critical curves and can be used for reconstruction of diamagnetic phase diagrams

Cellular Adhesion to Carbon Nanotubes-anchored Oligonucleotide: Electro-chemical Detection

In the study a new biosensor contained an oligonucleotide-carbon nanotubes-stearic acid monocrystalline clusters in its sensitive coating has been developed. The electrochemical characteristics of sensors with different coatings distinguishing by content of oligonucleotide and cerium ions have been measured. It was found that the presence of Ce in the coating leads to decrease of sensor capacity changes at measurements in mediums of different content. The oligonucleotides anchored in sensor coating attenuate cell nonantisense adhesion to sensor surface. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3547

Josephson dynamics for coupled polariton modes under the atom-field interaction in the cavity

We consider a new approach to the problem of Bose-Einstein condensation (BEC) of polaritons for atom-field interaction under the strong coupling regime in the cavity. We investigate the dynamics of two macroscopically populated polariton modes corresponding to the upper and lower branch energy states coupled via Kerr-like nonlinearity of atomic medium. We found out the dispersion relations for new type of collective excitations in the system under consideration. Various temporal regimes like linear (nonlinear) Josephson transition and/or Rabi oscillations, macroscopic quantum self-trapping (MQST) dynamics for population imbalance of polariton modes are predicted. We also examine the switching properties for time-averaged population imbalance depending on initial conditions, effective nonlinear parameter of atomic medium and kinetic energy of low-branch polaritons.Comment: 10 pages, 6 postscript figures, uses svjour.cl

Primary care reform in Central and Eastern Europe: can Belarus be taken as the control group in international comparison?

Background: Health care reform proceeds differently in Belarus. The country has not followed trends visible in most other countries. Financing and provision of health care is still in the hands of the state. Health insurance funds are unknown, private practices are rare and operating outside the system, and power of regional health authorities is limited. Besides, for political reasons the country does not benefit from important international aid programmes. Nevertheless, some change can be observed, particularly in Belarus primary care. A family doctor system is being implemented in rural areas, where the situation of health care is poor. Since 1998 two subsequent Dutch-sponsored bilateral projects have supported this development. This paper provides a state of affair of primary care policy development in Belarus and presents first results from a national survey among primary care doctors. Methods: Based on official documents and experiences from the authors, primary care development in Belarus has been analysed in the light of the role of regional health authorities, educational institutes, and the recently established association of family doctors. The national survey among a random sample of primary care doctors (including newly re-trained family doctors) in three regions of the country has been implemented in Spring 2005. The survey instrument has been used internationally. Results: The do’s and dont’s of health care policy in Belarus will be presented.First, results of the national survey among doctors in primary care will be presented, in particular, on the provision of their clinical tasks and aspects of their workload. Family doctor will be compared to doctors who have not been re-trained; Belarus will be compared with other countries. Conclusions: Health care develops very slowly in Belarus, but the country cannot be considered as the open air museum of the Semasko system. (aut.ref.

The new ultra high-speed all-optical coherent streak-camera

In the present paper a new type of ultra high-speed all-optical coherent streak-camera was developed. It was shown that a thin resonant film (quantum dots or molecules) could radiate the angular sequence of delayed ultra-short pulses if a transverse spatial periodic distribution of the laser pump field amplitude has a triangle shape

The results of search for the neutrino magnetic moment in GEMMA experiment

The result of the neutrino magnetic moment measurement at the Kalinin Nuclear Power Plant (KNPP) with GEMMA spectrometer is presented. The antineutrino-electron scattering is investigated. A high-purity germanium detector with a mass of 1.5kg placed at a distance of 13.9m from the 3 G W t h reactor core is exposed to the antineutrino flux of 2 . 7 Oe 1 0 1 3 1/cm2/s. The recoil electron spectra taken in 18134 and 4487 hours for the reactor ON and OFF periods are compared. The upper limit for the neutrino magnetic moment g g - < 2 . 9 Oe 1 0 -' 1 1 g g at 90% C.L. is derived from the data processing