• Noninvasive identification of two small simultaneous ischemic lesions in the myocardium
• Optoelektronic Assembly of ECDL and HeNe Laser for Observation of their  frequency beats
• Methods and Apparatus for Nuclotron Accelerator Control

Result 1: Noninvasive identification of two small simultaneous ischemic lesions in the myocardium

Project: VEGA 2/7092/27

Authors: J.Švehlíková, M.Tyšler, M.Turzová, E.Hebláková

In a simulation study a method for identification of 2 small ischemic lesions was proposed. It is based on an inverse solution for 2 dipoles and uses changes in maps of time integrals of ECG potentials on the chest surface measured during manifestation of ischemia. The identification criteria were specified using results of experiments with models of single small lesions and their combinations. When examining properties of each inverse solution, all pairs of dipoles were taken into account that were able to approximate the input difference integral map with a relative error higher no more than 1% when compared with with the best solution. Obtained dipoles were clustered into 2 groups. The criteria for identification of 2 small lesions were equal number of dipoles in both clusters and standard deviation of the dipole orientation less than 25º in each cluster. Using these criteria we were able to identify 75% of cases with 2 small simultaneous lesions and to exclude all cases with single small lesion. The proposed citeria were verified on another independent set of different lesions with the same result. The mean localization error of identified lesions was 1,2 cm (0,2-3,1 cm), the mean error of dipole orientation was 20 º (2º-57 º). 

Publications:

• ŠVEHLÍKOVÁ J., TYŠLER M., TURZOVÁ M., HEBLÁKOVÁ E.: Identification of local repolarization changes in the heart by an inverse solution with two dipoles. In: Proceedings of the XXXVth International Congress on Electrocardiology, 49th International Symposium on Vectorcardiology and 7th International Symposium on Comparative Electrocardiology, September 18-21, 2008, St. Petersburg, Russia (in press).
• ŠVEHLÍKOVÁ J., TYŠLER M., TURZOVÁ M., HEBLÁKOVÁ E.: Possible noninvasive identification of small single or double lesions from variations in surface cardiac electric field, 100th ICB Seminar on: "Variability of Biomedical Signals". November 20-23, 2008, Warsaw, Poland. (Invited lecture) 

Result 2: Optoelektronic Assembly of ECDL and HeNe Laser for Observation of their  frequency

Project: VEGA 2/7081/27

Authors: J. Bartl, J. Ďurišová, V. Jacko, R. Ševčík

In the laboratory of IM SAS the optoelectronic system for the observation of lasers frequencies beats was realized in cooperation with ISI CAS Brno. The system consists from experimental semiconductor laser with expanded resonance cavity in Littman Metcalf arrangement and by iodine stabilised  HeNe laser. This system was realized for research of semiconductor lasers and their application in the length metrology. The beams of both lasers were pointed to the avalanche photodiode and by the method of heterodyne detection the frequency beats were observed by the spectral analyser. The single-mode run was reached on ECDL with FWHM <1 MHz. Such result is suitable for stabilisation of laser in iodine vapour by the tools  of the molecular spectroscopy, which eliminates the Doppler bradening of the spectral line. In this manner stabilised lasers can reach the relative standard uncertainty in the range of 10^-10 to 10^-11.

Publications:

• BARTL, J.- GUTTENOVÁ, J.- JACKO, V.- ŠEVČÍK, R.: Stabilizácia optickej frekvencie laserov. Metrológia a skúšobníctvo, 13, 2008, č.1, s.4-8.
• BARTL, J.: Zaujímavé meranie v netradičných oblastiach, praktické uplatnenie. Metrologické listy, 31, 2008, No 2, 20-26.
  BARTL, J.: Realizácia jednotky dĺžky. In: Seminár metrológov ŽSR. Stredisko internátnej prípravy Strečno, 15.-16.10.2008, Železnice Slovenskej Republiky 2008, 2-13.
• BARTL, J.: Meranie dĺžky a geometrických veličín. In: Zborník prednášok z kurzu Meranie dĺžky a kalibrácia meradiel dĺžky v praxi. Hotel Detva, 23.-25.9.2008, Kalibračné združenie SR, Bratislava 2008, 3-13.

Result 3: Methods and Apparatus for Nuclotron Accelerator Control

Project: contract with Joint Institute for Nuclear Research, Dubna, Russia

Authors: D. Krušinský, Ľ. Ondriš

In the Institute of Measurement Science the research and development of diagnostic methods and devices for accelerator Nuclotron control and measurement of output particle beams from this accelerator was realised. In the frame of contract No 0862631 58 electronic devices for magnetic field cycle of Nuclotron were designed and realised in the Department of Optoelectronic Measuring Methods. The new control and monitoring system was designed for inherent extent of functionality of existing device. The grid (BM), focusing (QF) and defocusing (QD) magnets are fed from three sources. The magnetic field of BM magnet is shaped with impulse function generator, which generates reference impulse (Bo-train) with resolution 10^-5 T. Sequence for function generator control is created by 18 bit DAC. Instantaneous value of magnetic field in the BM is used as reference value for adjustment of the focusing and defocusing magnets.

Publication:

• V. Volkov, V. Andreev, E. Frolov, V. Gorchenko, V. Karpinsky, A. Kirichenko, A.D. Kovalenko, S. Romanov, A. Tsarenkov, B. Vasilishin, D. Krusinsky, L. Ondris: Control System for Nuclotron Main Power Supplies. Proc. EPAC 2006 Edinburgh, Scotland