Overhauser effect in individual InP/GaInP dots

Sizable nuclear spin polarization is pumped in individual InP/GaInP dots in a wide range of external magnetic fields B_ext=0-5T by circularly polarized optical excitation. We observe nuclear polarization of up to ~40% at Bext=1.5T and corresponding to an Overhauser field of ~1.2T. We find a strong feedback of the nuclear spin on the spin pumping efficiency. This feedback, produced by the Overhauser field, leads to nuclear spin bi-stability at low magnetic fields of Bext=0.5-1.5T. We find that the exciton Zeeman energy increases markedly, when the Overhauser field cancels the external field. This counter-intuitive result is shown to arise from the opposite contribution of the electron and hole Zeeman splittings to the total exciton Zeeman energy

Overhauser effect in individual InP/GaInP dots

Sizable nuclear spin polarization is pumped in individual InP/GaInP dots in a wide range of external magnetic fields B_ext=0-5T by circularly polarized optical excitation. We observe nuclear polarization of up to ~40% at Bext=1.5T and corresponding to an Overhauser field of ~1.2T. We find a strong feedback of the nuclear spin on the spin pumping efficiency. This feedback, produced by the Overhauser field, leads to nuclear spin bi-stability at low magnetic fields of Bext=0.5-1.5T. We find that the exciton Zeeman energy increases markedly, when the Overhauser field cancels the external field. This counter-intuitive result is shown to arise from the opposite contribution of the electron and hole Zeeman splittings to the total exciton Zeeman energy

PERITONEAL DIALYSIS IN UKRAINE: 2009–2013

We analyzed the information of the state ofperitoneal dialysis in Ukraine for the period 2009–2013. The authors are grateful to all the main coordinators of the regional registries who had sent the relevant information to the SI «Institute of Nephrology NAMS of Ukraine», and contributed to the formation of the National Register

Rating score of renal medical care in Ukraine 2017

The aim of the work was to conduct a rating evaluation of nephrological services in the regions of Ukraine by using the method of complex statistical coefficients. Materials and methods. Evaluation of nephrological services in the regions of Ukraine was made by using indicators that characterize the structure, use of health care resources, quality and efficiency of its provision submitted to National Register of patients with chronic kidney disease and patients with acute kidney injury (2017). Results. The sum of integral indicators in different areas of our analytical research has identified Top-3 regions by number: nephrologists; hemodialysis (GD) machines, patients receiving GD; patients treated with peritoneal dialysis (PD); patients with functional transplanted kidney and in the prevalence of acute kidney damage (GFR) per million population. Summary. By using rating evaluation methodology, it was identified place of relevant region by each indicator of nephrological care in the region as a whole

RATING SCORE SPECIALIZED MEDICAL CARE PATIENTS RENAL PROFILE IN UKRAINE 2016

Rating evaluation of specialized medical care for patients with renal deceases in Ukraine is conducted on basis of analysis of main criteria’s of its organization and availability, of results of treatment of CKD patients stage 5 HD, PD, T and AKI patients. Regional rating was evaluated separately for every group of parameters and then the summary rating evaluation was conducte

Suppression of nuclear spin diffusion at a GaAs/AlGaAs interface measured with a single quantum dot nano-probe

Nuclear spin polarization dynamics are measured in optically pumped individual GaAs/AlGaAs interface quantum dots by detecting the time-dependence of the Overhauser shift in photoluminescence (PL) spectra. Long nuclear polarization decay times of ~ 1 minute have been found indicating inefficient nuclear spin diffusion from the GaAs dot into the surrounding AlGaAs matrix in externally applied magnetic field. A spin diffusion coefficient two orders lower than that previously found in bulk GaAs is deduced.Comment: 5 pages, 3 figures, submitted to Phys Rev

RATING EVALUATION OFSPECIALIZED MEDICAL CARE BYTHEPATIENTSNEPHROLOGIC PROFILE OFTHE UKRAINEPROVINSE

The aim of the work was to conduct a comparative analysis of indicators of the performance of nephrological services in the regions of Ukraine by using the method of complex statistical coefficients. Materials and methods. Evaluation of the performance of the system of provision of nephrological services in the regions of Ukraine was made by studying the indicators that characterize the structure, use of health care resources, quality and efficiency of its provision submitted to National Register ofpatients with chronic kidney disease and patients with acute kidney injury (2015). Results. By using rating evaluation methodology, it was identified place of relevant region by each indicator, by each area and by all areas of provision of nephrological services in the region as a whole. Conclusions. As a result of a comprehensive study of the condition of the system of providing nephrological service in the regions, there were identified ranking places of the administrative territories

THE MEDICAL AND PREVENTIVE CARE TO PATIENTS OF A NEPHROLOGICAL PROFILE 2009-2012, WHAT TO DO NEXT ?

This is a study of the basic performance of nephrology care to the population of Ukraine during 2009-2012. The paper used the data from the National registry of patients with chronic kidney disease during 2009-2012, published by the "Institute of Nephrology of NAMS of Ukraine." The results of analysis testify to considerable lag on the size of basic parameters of medical help to the patients of nephrological profile from European