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1
Content available remote Multiple Exciton Generation in InAs Nanocrystals
100%
Kowalski P. , Machnikowski P.
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nr 5
1187-1192
EN
We study a simple theoretical model of multiple exciton generation by a single high-energy photon absorbed in an InAs nanocrystal. We calculate the Coulomb matrix element for the electron-trion coupling in an InAs nanocrystal and show that due to the resulting coupling between single-pair and two-pair states the latter becomes weakly optically active.
2
Presence, biological role and biotransformation of limonene
80%
Trytek M. , Kowalski P. , Fiedurek J.
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2003
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nr 2
206-217
EN
Monoterpenes, widely distributed in nature, constitute suitable precursor substrates for potential production of valuable natural flavour and fragrance compounds. Among various monoterpenes, limonene is a cheap and readily available starting material, utilized for e.g. biotransformation into more valuable compounds like carvone and alpha-terpineol. This rewiev presents properties, application, and possibilities, as well as trials of biotechnological conversion of limonene using some microorganisms.
3
Content available remote Structure of Chitosan-ZnO Layers Electrophoretically Deposited on NiTi Shape Memory Alloy
80%
Goryczka T. , Kokoszka A. , Kowalski P. , Łosiewicz B.
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nr 4
1056-1058
EN
The surface of NiTi shape memory was modified by deposition of chitosan-ZnO thin film. The electrodeposition process was carried out at room temperature at voltage-time conditions: 10 V/30 s, 10 V/300 s, 20 V/30 s, or 20 V/300 s. Structure of the obtained coatings was studied by means of grazing incidence beam X-ray diffraction. Distribution of the zinc oxide particles in the chitosan matrix was observed with use of scanning electron microscopy. It was found that depending on the electrodeposition parameters, the structure of the obtained chitosan-ZnO coatings varies from amorphous to coarse-grained.
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
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2015
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tom 127
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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
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2015
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tom 127
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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 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
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2015
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tom 127
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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.
7
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
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2015
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tom 127
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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.
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
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2015
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tom 127
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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.
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