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Tytuł:
Validity of MRI brain perfusion imaging method
Autorzy:
Karczewski, B.
Rumiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/333584.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
obrazowanie medyczne
obrazowanie rezonansu magnetycznego
perfuzja mózgu
medical imaging
MRI
brain perfusion
Opis:
Brain perfusion imaging using Dynamic Susceptibility Contrast Magnetic Resonance Imaging is very promising method since it can be easily implemented as a standard contrast-based MRI procedure. Quantitative brain perfusion description by DSC-MRI data post processing requires validation. Different validation analysis was performed to verify the influence of a bolus dispersion, delay, low SNR and calculation procedures on final perfusion parameter values. The results indicate that quantitative description of brain perfusion using DSC-MRI is possible and can be acceptable with accuracy about 10%.
Źródło:
Journal of Medical Informatics & Technologies; 2006, 10; 55-61
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric imaging in dynamic glucose metabolism studies in brain
Autorzy:
Rumiński, J.
Karczewski, B.
Powiązania:
https://bibliotekanauki.pl/articles/333769.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
obrazowanie parametryczne
obrazowanie dynamiczne
przetwarzanie obrazów
PET
parametric imaging
dynamic imaging
image processing
Opis:
Parametric imaging is more and more popular in dynamic brain studies. It enables to quantitatively or semi-quantitatively estimate physiological state and processes in brain. This work analyse the dynamic 18FDG-PET studies for estimation of brain glucose metabolism. The influence of the signal noise is analysed to estimate its influence on the final glucose metabolism parameter values. The LCMRGlc parameter is under investigation. It is based on three compartmental model proposed by Phelps. Using different 18FDG-PET data series obtained from independent sources the Gaussian noise was introduced (with different variance). Then the quality of the model fitting results were estimated. The final results clearly indicates than the noise is highly compensated in microparameter used in calculation of LCMRGlc. Concluding, it is possible to estimate the LCMRGlc parameter value even in the presence of noise.
Źródło:
Journal of Medical Informatics & Technologies; 2005, 9; 201-208
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Z badań nad występowaniem komarów (Diptera, Culicinae) i ich zwalczaniem z apomocą aerozoli
Contribution to the occurrence of Diptera, Culicinae and their control using the aerosols
Issledovanija pojavlenija komarov (Diptera, Culicinae) i borby s nimi pri pomoshhi aehrozolejj
Autorzy:
Wegorek, W.
Karczewski, B.
Powiązania:
https://bibliotekanauki.pl/articles/838578.pdf
Data publikacji:
1967
Wydawca:
Polskie Towarzystwo Parazytologiczne
Opis:
In order to determine the optimal terms of control of antropophilic species, the ecological-faunistical investigations were carried out taking into considerations the phenology of these mosquitos. Basing upon the results the control measures were elaborated and the evaluation of efficiency of aerosol application was done. In pilot investigations, only in the summer months, the presence of 14 antropophilic species was stated, among them 12 species out of the genus Aedes Meig. The dominant was A. vexans Meig., the subdominant was A. sticticus Meig. In sampling with the light source self-trapping, for general faunistical investigation were registered 16 species with ornitophilic species Culex pipiens pipiens L. at the top and with the for a longest time occurring Anopheles (Anopheles) maculipennis Meig. and Theobaldia annulata Schrank. In the water reservoirs were present exclusively the larvae of the genus Aedes. The species composition of this area was very rich in comparison to the number of 22 species for the Warszawa-region, noted by different investigators. During the full-season investigations of the 1965, in the spring-summer time, while sampling using baits and the self-trapping devide dominated species from the genus Aedes in the autumn using the self-trapping devide the C. pipiens dominated mixed up with T. annulata. A. maculipennis as well as not numerously present species of the genus Aedes (A. cinereus, A. vexans and other). In the water reservoirs dominated that year the species of the genus Theobaldia N-L., Anopheles, to a lower degree Culex. The rise of intensity of occurrence of Diptera, Culicinae during the season was noted four time, twice at very high degree. The control of the pests was based upon the method of laying down a chemical barrier. A technique of aerosol application in the open area was developed using the hand pulsating apparatus of the type "Swingfog" (GFR). A preparation rontaining 10% of DDT was applied in aerosol. The measures were applied as dry fog. The efficiency, at the rate of application of 8 l of chemical per ha was equal to 100% (in control of larvae in water reservoirs), at the rate of 6 1/ha (against the imago stages) it was 99.3-100%, and at 2-2.2 1/ha – 99.2-99.5%. These control measures resulted in lowering the intensity of presence of those pests in the investigated area. High operativeness of the chosen technique is indicated by the labor efficiency up to 5 ha/hour with the working width equal to 5-30 meters on lower costs as compared to the commonly applied dassical measures of control.
Źródło:
Annals of Parasitology; 1967, 13, 4-5
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Z badań nad występowaniem komarów (Diptera, Culicinae) i ich zwalczaniem za pomocą aerozoli
Contribution to the occurrence of Diptera, Culicinae and their control using the aerosols
Issledovanija pojavlenija komarov (Diptera, Culicinae) i borby s nimi pri pomoshhi aehrozolejj
Autorzy:
Węgorek, W.
Karczewski, B.
Powiązania:
https://bibliotekanauki.pl/articles/2177760.pdf
Data publikacji:
1967
Wydawca:
Polskie Towarzystwo Parazytologiczne
Opis:
In order to determine the optimal terms of control of antropophilic species, the ecological-faunistical investigations were carried out taking into considerations the phenology of these mosquitos. Basing upon the results the control measures were elaborated and the evaluation of efficiency of aerosol application was done. In pilot investigations, only in the summer months, the presence of 14 antropophilic species was stated, among them 12 species out of the genus Aedes Meig. The dominant was A. vexans Meig., the subdominant was A. sticticus Meig. In sampling with the light source self-trapping, for general faunistical investigation were registered 16 species with ornitophilic species Culex pipiens pipiens L. at the top and with the for a longest time occurring Anopheles (Anopheles) maculipennis Meig. and Theobaldia annulata Schrank. In the water reservoirs were present exclusively the larvae of the genus Aedes. The species composition of this area was very rich in comparison to the number of 22 species for the Warszawa-region, noted by different investigators. During the full-season investigations of the 1965, in the spring-summer time, while sampling using baits and the self-trapping devide dominated species from the genus Aedes in the autumn using the self-trapping devide the C. pipiens dominated mixed up with T. annulata. A. maculipennis as well as not numerously present species of the genus Aedes (A. cinereus, A. vexans and other). In the water reservoirs dominated that year the species of the genus Theobaldia N-L., Anopheles, to a lower degree Culex. The rise of intensity of occurrence of Diptera, Culicinae during the season was noted four time, twice at very high degree. The control of the pests was based upon the method of laying down a chemical barrier. A technique of aerosol application in the open area was developed using the hand pulsating apparatus of the type "Swingfog" (GFR). A preparation rontaining 10% of DDT was applied in aerosol. The measures were applied as dry fog. The efficiency, at the rate of application of 8 l of chemical per ha was equal to 100% (in control of larvae in water reservoirs), at the rate of 6 1/ha (against the imago stages) it was 99.3-100%, and at 2-2.2 1/ha – 99.2-99.5%. These control measures resulted in lowering the intensity of presence of those pests in the investigated area. High operativeness of the chosen technique is indicated by the labor efficiency up to 5 ha/hour with the working width equal to 5-30 meters on lower costs as compared to the commonly applied dassical measures of control.
Źródło:
Wiadomości Parazytologiczne; 1967, 13, 4-5; 455-457
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The HRCT image analysis for quantitative description of peripheral airways remodelling
Autorzy:
Rumiński, J.
Karczewski, B.
Mincewicz, G.
Aloszko, A.
Krzykowski, G.
Powiązania:
https://bibliotekanauki.pl/articles/333680.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
obrazy HRCT
przebudowa dróg oddechowych
analiza obrazu
HRCT images
airways remodelling
image analysis
Opis:
Airways remodelling is currently described as a process occurring before asthma becomes clinically manifest, which is confirmed by biopsy studies. The aim of this study was to test and validate image analysis methods to describe the changes such as peripheral airways remodelling in HRCT readings. Different methods of airways extraction from HRCT images were investigated including: manual identification of an airway region major axes on original and scaled images (using different interpolation techniques like pixel resize, bilinear interpolation and cubic convolution), manual extraction of the density profile through the major axes of an airway region, semi-automatic method using active contours and the Hough transform. Methods were tested with original images and artificially modified images by blurring and noise addition (Gaussian, Laplacian and salt-and-pepper). Results suggest that popular image magnification using cubic convolution is not suitable for accurate estimation of shape properties of small regions. Smart pixel resizing enables to delineate a region of inner and outer borders with subpixel accuracy reducing the total error of the wall thickness estimation. Additionally smoothing must be reduced to the minimum in the case of an active contour application.
Źródło:
Journal of Medical Informatics & Technologies; 2004, 7; MIP21-30
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wytrzymałość pętli wplatanych na linach podwójnie plecionych
The strength of splices in the double-braided ropes
Autorzy:
Zajączkowska, B.
Karczewski, A.
Czaja, A.
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/344314.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Wydawnictwo Uniwersytetu Morskiego w Gdyni
Tematy:
osprzęt żaglowy
takielunek
lina pleciona
pętla wplatana
splot Dyneema
sails
rigging
braided rope
splice
Dyneema
Opis:
Cechą wyróżniającą statki żaglowe z grona innych obiektów pływających są żagle. To cecha widoczna, za którą kryją się mniej romantyczne elementy, takie jak maszty, liny i osprzęt. Rozpostarcie białych płócien na maszcie i następnie żeglowanie wymaga sprawnego operowania nimi, co wiąże się z doborem odpowiedniego ich zestawu, ułożenia i napięcia. To maszty są kręgosłupem takielunku, a liny jego mięśniami i ścięgnami. Do poprawnego działania całego układu przyczynia się każda z jego części. Tak jak w żywym organizmie mięśnie muszą być przyłączone do kośćca właściwym przyczepem, tak na jachcie liny należy odpowiednio połączyć z pozostałymi komponentami takielunku. W artykule skupiono się na problemie łączenia lin z innymi elementami osprzętu żaglowego i wytrzymałości tego połączenia. Przeanalizowano rozwiązanie mające zarówno cechy techniki tradycyjnej, łączenia za pomocą pętli wplatanych, jak i elementy współczesnego jachtingu, ponieważ jako materiał zastosowano linę DynaLite. Badania zostały wykonane w ramach pracy inżynierskiej na Wydziale Oceanotechniki i Okrętownictwa Politechniki Gdańskiej. W zakresie zadania znajdowało się badanie wytrzymałości pętli o różnych długościach wplotu oraz określenie wpływu parametrów konstrukcji splotu na jego wytrzymałość. Porównano również właściwości przyjętego rozwiązania z połączeniem za pomocą węzła ratowniczego oraz wytrzymałość liny, na której wykonano testy z danymi podanymi przez producenta.
The distinguishing feature of sailing ships from the group of other floating objects are the sails. This is a visible feature behind which are less romantic elements such as masts, ropes and rigging. Raising the white sails and then sailing requires efficient handling, which involves choosing the right sails-set, them position and tension. These masts are the backbone of the rigging, and the ropes with its muscles and tendons. Every part of it contributes to the correct functioning of the whole system. As in living organisms, the muscles must be attached to the bone in the proper trailer, so that the ropes on the yacht should be properly connected to the other rigging components. This article presented the problem of joining ropes with other components and the strength of this connection. A solution that has both the characteristics of traditional techniques, by the splice the rope and the elements of new yachting trends has been analyzed, as DynaLite has been used as a material. The research was done at the Faculty of Ocean Engineering and Ship Technology of Gdansk University of Technology. The task was to test the strength of the loop with different lengths of the splice and to determine the impact of the parameters on its strength. The strength of the connection with bowline has been checked. The strength of the tested rope with the data provided by the manufacturer were also compared.
Źródło:
Prace Wydziału Nawigacyjnego Akademii Morskiej w Gdyni; 2017, 32; 106-120
1730-1114
Pojawia się w:
Prace Wydziału Nawigacyjnego Akademii Morskiej w Gdyni
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single Particle and Collective Spin Excitations in Semimagnetic Quantum Wells
Autorzy:
Perez, F.
Jusserand, B.
Richards, D.
Karczewski, G.
Powiązania:
https://bibliotekanauki.pl/articles/2038315.pdf
Data publikacji:
2004-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.25.Dc
73.21.-b
75.70.-i
78.30.-j
Opis:
Collective and single-particle spin-flip excitations of a two-dimensional electron gas in a semimagnetic Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te quantum well are observed by resonant Raman scattering. Application of a magnetic field splits the spin-subbands and a spin-polarization is induced in the electron gas. Above some critical field, a collective spin-flip mode, which disperses with in-plane wave vector, dominates the spectra. The energy of this mode is given by the bare Zeeman energy at vanishing wave vector as predicted by Larmor's theorem and its in-plane dispersion is well described by a model of the interacting polarizability of a spin polarized electron gas when both exchange and correlation are taken into account.
Źródło:
Acta Physica Polonica A; 2004, 106, 3; 311-317
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Dynamic Dielectric Function "Anomaly" for HgSe:Ga and HgSe:Fe
Autorzy:
Szuszkiewicz, W.
Karczewski, G.
Jeżewski, M.
Witkowska, B.
Mycielski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1887004.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
78.20.Ci
78.30.Fs
Opis:
Reflectivity spectra of HgSe crystals highly doped with Ga and Fe, respectively, were investigated in the spectral region close to the absorption edge at temperatures between 12 K and 295 K. From the analysis of the structure observed in reflectivity the temperature dependence of the Fermi energy was determined for both kinds of crystals.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 369-372
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jod i wapń w wodach do picia woj. białostockiego
Iodine and calcium in drinking water in the Białystok province
Autorzy:
Januszko, T.
Karczewski, J.
Poplawska, T.
Smorczewska, B.
Suszczynska-Falecka, Z.
Powiązania:
https://bibliotekanauki.pl/articles/873239.pdf
Data publikacji:
1977
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
woj.bialostockie
woda pitna
jod
wapn
zawartosc jodu
zawartosc wapnia
badania naukowe
Źródło:
Roczniki Państwowego Zakładu Higieny; 1977, 28, 5
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exciton Dynamics in CdTe/CdMnTe Multiquantum Well Structures Grown by Molecular Beam. Epitaxy on GaAs Substrate
Autorzy:
Godlewski, M.
Koziarska, B.
Suchocki, A.
Karczewski, G.
Wojtowicz, T.
Kossut, J.
Bergman, J.
Monemar, B.
Powiązania:
https://bibliotekanauki.pl/articles/1934057.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.60.-p
78.47.+p
73.20.Fz
71.35.+z
Opis:
The results of picosecond photoluminescence kinetics of four different CdTe/CdMnTe multiquantum well structures grown by MBE on GaAs substrates are presented. The experimental results show that excitons in CdTe quantum wells are strongly localized by potential fluctuations. Photoluminescence decay times of the localized excitons are considerably shorter (about 120 ps) than those reported for free or quasi-free excitons. An influence of Mn in the barriers on exciton properties is demonstrated. For narrow quantum wells as well as for the multiquantum well structure with the highest Mn mole fraction the excitons migrate during their decay to the states with a lower potential energy. Longer decay times are observed for quasi-localized excitons. We show also that for strongly localized excitons the energy transfer between localized and donor bound excitons is less efficient.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 985-989
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoluminescence of Donor-Doped ZnSe Films Grown by Molecular Beam Epitaxy
Autorzy:
Karczewski, G.
Hu, B.
Yin, A.
Luo, H.
Dobrowolska, M.
Furdyna, J. K.
Powiązania:
https://bibliotekanauki.pl/articles/1932090.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
78.55.Et
Opis:
We studied the effect of the donor doping of ZnSe films on their photoluminescence properties. The samples were doped during the molecular beam epitaxy growth, either with gallium or with chlorine. As the dopant concentration dose increases, the intensity of the band-edge emission first saturates, and then quenches in favor of the deep-level photoluminescence band. The main effect of donor doping on photoluminescence is a strong increase in intensity of the donor-bound exciton line, referred to as I$\text{}_{2}$. For Ga-doped films deep-band emission is much stronger, and the I$\text{}_{2}$-line is slightly weaker than for Cl-doped films with comparable doping level. The results confirm the superiority of chlorine over gallium as an n-type dopant in ZnSe. We discuss the photoluminescence results and relate them to deep level transient spectroscopy data obtained on the same samples.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 245-248
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recombination Processes in Doped CdTe/CdMnTe Multiple Quantum Well Structures Grown by Molecular Beam Epitaxy
Autorzy:
Godlewski, M.
Wojtowicz, T.
Karczewski, G.
Kossut, J.
Bergman, J. P.
Monemar, B.
Powiązania:
https://bibliotekanauki.pl/articles/1968089.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.47.+p
78.55.Et
Opis:
An influence of doping level on exciton properties in n-doped multiple quantum well structures of CdTe/CdMnTe is studied for multiple quantum well structures prepared in the way that donor (indium) concentration changes within the length of the sample. We show that the formation scenario for neutral donor bound excitons in low-dimensional structures can be different from that observed in bulk samples. We further show that in the case of such quantum well structures we can selectively excite either photoluminescence emission of localized or donor bound excitons, which is a consequence of surprisingly weak energy transfer link between two types of excitonic transitions.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 757-760
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonant Raman Spectra of CdTe/ZnTe Self Assembled Quantum Dots
Autorzy:
Romčević, N.
Romčević, M.
Kostić, R.
Stojanović, D.
Abolmasov, B.
Karczewski, G.
Galazka, R.
Powiązania:
https://bibliotekanauki.pl/articles/1807840.pdf
Data publikacji:
2009-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.22.-m
78.30.Fs
78.55.Et
Opis:
In this paper we present Raman scattering and photoluminescence spectra measured on CdTe/ZnTe self assembled quantum dots. The photoluminescence spectrum has shown two main emission peaks, both connected with existing of quantum dots. One presents direct deexcitation to ground state and the other is optical phonon (οmega = 207.3 $cm^{-1}$)-assisted deexcitation. The registered multiphonon emission process depends on temperature. At low temperature phonon spectra shows line at 450 $cm^{-1}$ (TA + 2LO in ZnTe) and 595 $cm^{-1}$ (2LO + TO(Γ) in ZnTe).
Źródło:
Acta Physica Polonica A; 2009, 116, 1; 88-90
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Optical Properties of CdTe/CdMnTe Quantum Wells Grown by Molecular Beam and Atomic Layer Epitaxy
Autorzy:
Godlewski, M.
Kopalko, K.
Wojtowicz, T.
Karczewski, G.
Kossut, J.
Bergman, J. P.
Monemar, B.
Powiązania:
https://bibliotekanauki.pl/articles/1952470.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.+z
78.47.+p
78.55.Et
Opis:
Optical properties of a series of CdTe/CdMnTe multi quantum well structures grown with MBE and ALE (CdTe quantum wells only) methods are compared. Based on the results of the photoluminescence experiments we conclude that the ALE growth leads to a different lateral scale of quantum well width fluctuations, which results in different exciton properties in two multi quantum well systems studied. In the wells grown with ALE method excitons are less localized. They can migrate in a quantum well plane between quantum well regions varying in thickness by 1 monolayer.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 1012-1016
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exciton Properties in CdTe/CdMnTe Quantum Well Structures with Strong Localization Effects
Autorzy:
Godlewski, M.
Narkowicz, R.
Wojtowicz, T.
Karczewski, G.
Kossut, J.
Bergman, J. P.
Monemar, B.
Powiązania:
https://bibliotekanauki.pl/articles/1969075.pdf
Data publikacji:
1998-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.-y
71.55.Jv
73.20.Mf
Opis:
Strong localization effects present in quantum well structures of CdTe/ CdMnTe noticeably affect exciton dynamics and strength and character of exciton-phonon interaction. We show that the temperature dependences of the PL linewidth, PL peak wavelength and PL decay time strongly deviate from those expected for Wannier-excitons in structures with atomically smooth interfaces.
Źródło:
Acta Physica Polonica A; 1998, 94, 2; 317-320
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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