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1
Content available remote A game-theoretic model of social adaptation in an infinite population
100%
Wieczorek A. , Wiszniewska A.
Applicationes Mathematicae
|
1998-1999
|
tom 25
|
nr 4
417-430
EN
The paper deals with the question of existence and properties of equilibrated distributions of individual characteristics in an infinite population. General game-theoretic methods are applied and special attention is focused on the case of fitness functions depending only on the distance of an individual characteristic from a reference point and from the mean characteristics. Iterative procedures leading to equilibrated distributions are also considered.
2
Granulation of biomass in continuous anaerobic digestion
100%
Wieczorek A. , Michalska H.
Biotechnologia
|
1993
|
nr 4
155-162
EN
The development of granular sludge in the UASB reactor was investigated in bench scale (6,48 dm3).The different substrate loading rates were used during experiment.A synthetic medium based on volatile fatty acid was used. digested sewage sludge from distillery wastewater treatment plant was used as a seed. The granules of ca. 0.5 mm diameter had developed after about 120 days of operation.The setlling rate of these granules was 20-50 m\h.
3
Content available Occurrence of high-level aminoglycoside resistance (HLAR) among Enterococcus species strains
51%
Sieńko A. , Wieczorek P. , Wieczorek A. , Sacha P. , Majewski P. , Ojdana D. , Michalska A. , Tryniszewska E.
Progress in Health Sciences
|
2014
|
tom 4
|
nr 1
179-187
XX
Purpose: Today, Enterococcus species are one of the most frequent etiological agents in nosocomial infections. The aim of this study was to determine the susceptibility to antibiotics and the prevalence of high-level aminoglycoside resistance (HLAR) among Enterococcus strains. Materials and methods: The susceptibility of 85 isolates of Enterococcus (47 E. faecalis and 38 E. faecium) was determined using the disk diffusion method. The results were interpreted according to European Committee on Antimicrobial Suscepti-bility Testing (EUCAST) guidelines. PASW Statistics 17.0 was used for statistical analysis. Results: E. faecalis strains showed the highest susceptibility to ampicillin, tigecycline, vanco-mycin, imipenem, and linezolid and E. faecium to linezolid, tigecycline, and quinupristin/dalfopristin. Among all tested strains, high-level gentamicin resistance (HLGR) was found in 4% of E. faecalis and 8% of E. faecium strains, high-level strepto-mycin resistance (HLSR) in 45% and 42%, and HLAR in 50% and 32% of strains, respectively. HLGR was detected only in vancomycin-resistant Enterococcus (VRE)− strains (12%), while HLSR in 76.9% of VRE+ and 24% of VRE− strains, and HLAR in 23.1% of VRE+ and 64% of VRE− strains. The tested strains were also divided into two groups: HLSR+ and HLAR+. In both groups, statistically significant susceptibility differences (p<0.05) were found for ampicillin, imipenem and trimethoprim/sulfamethoxazole. The most frequent antibiotic resistance profile among E. faecalis strains was SR (resistance phenotype to strepto-mycin), and among E. faecium, AMPR, IMPR, CNR, SR, SXTR (ampicillin, imipenem, gentamicin, streptomycin, trimethoprim/sulfamethoxazole). Conclusions: This study showed the slowly increasing prevalence of HLAR and resistance to newer antibiotics (linezolid and tigecycline) among Enterococcus strains. It is necessary to search for new directions in the treatment of enterococcal infections.
4
Content available remote Hit Time and Hit Position Reconstruction in the J-PET Detector Based on a Library of Averaged Model Signals
26%
Moskal P. , Sharma N. , Silarski M. , Bednarski T. , Białas P. , Bułka J. , Czerwiński E. , Gajos A. , Kamińska D. , Kapłon L. , Kochanowski A. , Korcyl G. , Kowal J. , Kowalski P. , Kozik T. , Krzemień W. , Kubicz E. , Niedźwiecki S. , Pałka M. , Raczyński L. , Rudy Z. , Rundel O. , Salabura P. , Słomski A. , Smyrski J. , Strzelecki A. , Wieczorek A. , Wiślicki W. , Wochlik I. , Zieliński M. , Zoń N.
Acta Physica Polonica A
|
2015
|
tom 127
|
nr 5
1495-1499
EN
In this article we present a novel method of hit time and hit position reconstruction in long scintillator detectors. We take advantage of the fact that for this kind of detectors amplitude and shape of registered signals depend strongly on the position where particle hits the detector. The reconstruction is based on determination of the degree of similarity between measured and averaged signals stored in a library for a set of well-defined positions along the scintillator. Preliminary results of validation of the introduced method with experimental data obtained by means of the double strip prototype of the J-PET detector are presented.
5
Content available remote Analysis Framework for the J-PET Scanner
26%
Krzemień W. , Gajos A. , Gruntowski A. , Stola K. , Trybek D. , Bednarski T. , Białas P. , Czerwiński E. , Kamińska D. , Kapłon Ł. , Kochanowski A. , Korcyl G. , Kowal J. , Kowalski P. , Kozik T. , Kubicz E. , Moskal P. , Niedźwiecki S. , Pałka M. , Raczyński L. , Rudy Z. , Salabura P. , Sharma N. , Silarski M. , Słomski A. , Smyrski J. , Strzelecki A. , Wieczorek A. , Wiślicki W. , Zieliński M. , Zoń N.
Acta Physica Polonica A
|
2015
|
tom 127
|
nr 5
1491-1494
EN
J-PET analysis framework is a flexible, lightweight, ROOT-based software package which provides the tools to develop reconstruction and calibration procedures for PET tomography. In this article we present the implementation of the full data-processing chain in the J-PET framework which is used for the data analysis of the J-PET tomography scanner. The framework incorporates automated handling of PET setup parameters' database as well as high level tools for building data reconstruction procedures. Each of these components is briefly discussed.
6
Content available remote GPU Accelerated Image Reconstruction in a Two-Strip J-PET Tomograph
26%
Białas P. , Kowal J. , Strzelecki A. , Bednarski T. , Czerwiński E. , Gajos A. , Kamińska D. , Kapłon Ł. , Kochanowski A. , Korcyl G. , Kowalski P. , Kozik T. , Krzemień W. , Kubicz E. , Moskal P. , Niedźwiecki S. , Pałka M. , Raczyński L. , Rudy Z. , Rundel O. , Salabura P. , Sharma N. , Silarski M. , Słomski A. , Smyrski J. , Wieczorek A. , Wiślicki W. , Zieliński M. , Zoń N.
Acta Physica Polonica A
|
2015
|
tom 127
|
nr 5
1500-1504
EN
We present a fast GPU implementation of the image reconstruction routine, for a novel two strip PET detector that relies solely on the time of flight measurements.
7
Content available remote Multiple Scattering and Accidental Coincidences in the J-PET Detector Simulated Using GATE Package
26%
Kowalski P. , Moskal P. , Wiślicki W. , Raczyński L. , Bednarski T. , Białas P. , Bułka J. , Czerwiński E. , Gajos A. , Gruntowski A. , Kamińska D. , Kapłon Ł. , Kochanowski A. , Korcyl G. , Kowal J. , Kozik T. , Krzemień W. , Kubicz E. , Niedźwiecki S. , Pałka M. , Rudy Z. , Salabura P. , Sharma N. , Silarski M. , Słomski A. , Smyrski J. , Strzelecki A. , Wieczorek A. , Wochlik I. , Zieliński M. , Zoń N.
Acta Physica Polonica A
|
2015
|
tom 127
|
nr 5
1505-1512
EN
Novel positron emission tomography system, based on plastic scintillators, is developed by the J-PET collaboration. In order to optimize geometrical configuration of built device, advanced computer simulations are performed. Detailed study is presented of background given by accidental coincidences and multiple scattering of gamma quanta.
8
Content available remote A Pilot Study of the Novel J-PET Plastic Scintillator with 2-(4-styrylphenyl)benzoxazole as a Wavelength Shifter
26%
Wieczorek A. , Moskal P. , Niedźwiecki S. , Bednarski T. , Białas P. , Czerwiński E. , Danel A. , Gajos A. , Gruntowski A. , Kamińska D. , Kapłon Ł. , Kochanowski A. , Korcyl G. , Kowal J. , Kowalski P. , Kozik T. , Krzemień W. , Kubicz E. , Molenda M. , Pałka M. , Raczyński L. , Rudy Z. , Rundel O. , Salabura P. , Sharma N. , Silarski M. , Słomski A. , Smyrski J. , Strzelecki A. , Uchacz T. , Wiślicki W. , Zieliński M. , Zoń N.
Acta Physica Polonica A
|
2015
|
tom 127
|
nr 5
1487-1490
EN
For the first time a molecule of 2-(4-styrylphenyl)benzoxazole containing benzoxazole and stilbene groups is applied as a scintillator dopant acting as a wavelength shifter. In this article a light yield of the plastic scintillator, prepared from styrene doped with 2 wt% of 2,5-diphenylbenzoxazole and 0.03 wt% of 2-(4-styrylphenyl)benzoxazole, is determined to be as large as 60% ± 2% of the anthracene light output. There is a potential to improve this value in the future by the optimization of the additives concentrations.
9
Content available remote A Method to Produce Linearly Polarized Positrons and Positronium Atoms with the J-PET Detector
26%
Mohammed M. , Białas P. , Curceanu C. , Czerwiński E. , Dulski K. , Gajos A. , Głowacz B. , Gorgol M. , Hiesmayr B. , Jasińska B. , Kisielewska D. , Korcyl G. , Kowalski P. , Kozik T. , Krawczyk N. , Krzemień W. , Kubicz E. , Pawlik-Niedźwiecka M. , Niedźwiecki S. , Pałka M. , Raczyński L. , Raj J. , Rudy Z. , Sharma N. , Sharma S. , Shivani , Skurzok M. , Silarski M. , Wieczorek A. , Wiślicki W. , Zgardzińska B. , Zieliński M. , Moskal P.
Acta Physica Polonica A
|
2017
|
tom 132
|
nr 5
1486-1489
EN
A method for creating linearly polarized positrons and ortho-positronium (o-Ps) atoms with the J-PET detector is presented. The unique geometry and properties of the J-PET tomography enable one to design a positron source such that the quantization axis for the estimation of the linear polarization of produced o-Ps can be determined on the event by event basis in a direction of the positron motion. We intend to use ²²Na or other β⁺ decay isotopes as a source of polarized positrons. Due to the parity violation in the beta decay, the emitted positrons are longitudinally polarized. The choice of the quantization axis is based on the known position of the positron emitter and the reconstructed position of the positronium annihilation. We show that the J-PET tomography is equipped with all needed components.
10
Content available remote Human Tissue Investigations Using PALS Technique - Free Radicals Influence
26%
Jasińska B. , Zgardzińska B. , Chołubek G. , Pietrow M. , Gorgol M. , Wiktor K. , Wysogląd K. , Białas P. , Curceanu C. , Czerwiński E. , Dulski K. , Gajos A. , Głowacz B. , Hiesmayr B. , Jodłowska-Jędrych B. , Kamińska D. , Korcyl G. , Kowalski P. , Kozik T. , Krawczyk N. , Krzemień W. , Kubicz E. , Mohammed M. , Pawlik-Niedźwiecka M. , Niedźwiecki S. , Pałka M. , Raczyński L. , Rudy Z. , Sharma N. , Sharma S. , Shopa R. , Silarski M. , Skurzok M. , Wieczorek A. , Wiktor H. , Wiślicki W. , Zieliński M. , Moskal P.
Acta Physica Polonica A
|
2017
|
tom 132
|
nr 5
1556-1558
EN
The positron annihilation lifetime spectroscopy was applied to the samples of the human uterine leiomyomas and the normal myometrium tissues taken from the selected place of the uterus during a surgery. The method indicated differences in values of the measured positron annihilation lifetime spectroscopy parameters (lifetimes and intensities) between healthy and diseased tissue samples. The additional measurements were performed either in darkness or in presence of visible light which influenced the free radicals present in both kind of tissues and, as a result, made changes in free annihilation and o-Ps decay lifetime and intensity values.
11
Content available remote Time Calibration of the J-PET Detector
26%
Skurzok M. , Silarski M. , Alfs D. , Białas P. , Shivani , Curceanu C. , Czerwiński E. , Dulski K. , Gajos A. , Głowacz B. , Gorgol M. , Hiesmayr B. , Jasińska B. , Kisielewska-Kamińska D. , Korcyl G. , Kowalski P. , Kozik T. , Krawczyk N. , Krzemień W. , Kubicz E. , Mohammed M. , Pawlik-Niedźwiecka M. , Niedźwiecki S. , Pałka M. , Raczyński L. , Raj J. , Rudy Z. , Sharma N. , Sharma S. , Shopa R. , Wieczorek A. , Wiślicki W. , Zgardzińska B. , Zieliński M. , Moskal P.
Acta Physica Polonica A
|
2017
|
tom 132
|
nr 5
1641-1644
EN
The Jagiellonian positron emission tomograph project carried out in the Institute of Physics of the Jagiellonian University is focused on construction and tests of the first prototype of PET scanner for medical diagnostic which allows for the simultaneous 3D imaging of the whole human body using organic scintillators. The J-PET prototype consists of 192 scintillator strips forming three cylindrical layers which are optimized for the detection of photons from the electron-positron annihilation with high time-and high angular resolutions. In this article we present time calibration and synchronization of the whole J-PET detection system by irradiating each single detection module with a ²²Na source and a small detector providing common reference time for synchronization of all the modules.
12
Content available remote Analysis Procedure of the Positronium Lifetime Spectra for the J-PET Detector
26%
Dulski K. , Zgardzińska B. , Białas P. , Curceanu C. , Czerwiński E. , Gajos A. , Głowacz B. , Gorgol M. , Hiesmayr B. , Jasińska B. , Kisielewska-Kamińska D. , Korcyl G. , Kowalski P. , Kozik T. , Krawczyk N. , Krzemień W. , Kubicz E. , Mohammed M. , Pawlik-Niedźwiecka M. , Niedźwiecki S. , Pałka M. , Raczyński L. , Raj J. , Rudy Z. , Sharma N. , Sharma S. , Shivani S. , Shopa R. , Silarski M. , Skurzok M. , Wieczorek A. , Wiślicki W. , Zieliński M. , Moskal P.
Acta Physica Polonica A
|
2017
|
tom 132
|
nr 5
1637-1640
EN
Positron annihilation lifetime spectroscopy has shown to be a powerful tool to study the nanostructures of porous materials. Positron emission tomograph is a device allowing imaging of metabolic processes e.g. in human bodies. A newly developed device, the Jagiellonian PET will allow positron annihilation lifetime spectroscopy in addition to imaging, thus combining both analyses providing new methods for physics and medicine. In this contribution we present a computer program that is compatible with the Jagiellonian PET software. We compare its performance with the standard program LT 9.0 by using positron annihilation lifetime spectroscopy data from hexane measurements at different temperatures. Our program is based on an iterative procedure, and our fits prove that it performs as good as LT 9.0.
13
Content available remote Preliminary Studies of J-PET Detector Spatial Resolution
26%
Pawlik-Niedźwiecka M. , Niedźwiecki S. , Alfs D. , Białas P. , Curceanu C. , Czerwiński E. , Dulski K. , Gajos A. , Głowacz B. , Gorgol M. , Hiesmayr B. , Jasińska B. , Kisielewska D. , Korcyl G. , Kowalski P. , Kozik T. , Krawczyk N. , Krzemień W. , Kubicz E. , Mohammed M. , Pałka M. , Raczyński L. , Raj J. , Rudy Z. , Shivani , Silarski M. , Skurzok M. , Sharma N. , Sharma S. , Shopa R. , Strzelecki A. , Wieczorek A. , Wiślicki W. , Zgardzińska B. , Zieliński M. , Moskal P.
Acta Physica Polonica A
|
2017
|
tom 132
|
nr 5
1645-1648
EN
The J-PET detector, based on long plastic scintillator strips, was recently constructed at the Jagiellonian University. It consists of 192 modules axially arranged into three layers, read out from both sides by digital constant-threshold front-end electronics. This work presents preliminary results of measurements of the spatial resolution of the J-PET tomograph performed with ²²Na source placed at selected position inside the detector chamber.
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