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Wyświetlanie 1-15 z 16
Tytuł:
Studies of physicochemical properties of graphite oxide and thermally exfoliated/reduced graphene oxide
Autorzy:
Drewniak, S. E.
Pustelny, T. P.
Muzyka, R.
Plis, A.
Powiązania:
https://bibliotekanauki.pl/articles/779581.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
graphite oxide
thermally exfoliated/reduced graphene oxide
topography investigations
Raman spectroscopy
elemental analysis
Opis:
The aim of the experimental research studies was to determine some electrical properties of graphite oxide and thermally exfoliated/reduced graphene oxide. The authors tried to interpret the obtained physicochemical results. For that purpose, both resistance measurements and investigation studies were carried out in order to characterize the samples. The resistance was measured at various temperatures in the course of composition changes of gas atmospheres (which surround the samples). The studies were also supported by such methods as: scanning electron microscopy (SEM), Raman spectroscopy (RS), atomic force microscopy (AFM) and thermogravimetry (TG). Moreover, during the experiments also the elemental analyses (EA) of the tested samples (graphite oxide and thermally exfoliated/reduced graphene oxide) were performed.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 4; 109-114
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and numerical analyses of the planar grating coupler
Autorzy:
Struk, P.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/200635.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FDTD method
grating coupler
planar waveguide
Opis:
The paper presents the results of numerical analyses of the structures of integrated optics in the form of planar waveguides made of materials with high values of the refractive index n = 2.00 and with an input-output system in the form of Bragg grating couplers. The numerical investigations were carried out by using the FDTD method (Finite Difference Time Domain method).
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 4; 509-512
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Sensor for Measurements of the Blood Chamber Volume in the POLVAD Prosthesis - Static Measurements
Autorzy:
Konieczny, G.
Pustelny, T.
Marczyński, P.
Powiązania:
https://bibliotekanauki.pl/articles/1399376.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.-e
42.81.-i
07.07.Df
47.63.Cb
Opis:
The paper presents results of extended static measurements of a newly developed optical system for temporary blood chamber volume measurements in the Polish Ventricular Assist Device. The paper additionally introduces a modified measurement stand and improvements of the measurements. Exemplary results acquired with principal components analysis are shown and future development plans of an optical measurement system are stated.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 479-482
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on Pattern Recognition Applied for Volume Estimation of Blood Chamber with Matrix of Optical Sensors
Autorzy:
Marczyński, P.
Konieczny, G.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/1399384.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.30.Sy
47.54.-r
43.60.Lq
Opis:
The following article describes research on possibility of using pattern recognition algorithms in the optical measurement system for estimation of the blood chamber volume in the Polish Ventricular Assist Device (POLVAD). The optical system is being developed at the Department of Optoelectronics, Silesian University of Technology, Poland. Data analysis methods include a feature subset selection algorithm involving principal components analysis and objective function as quality criterion. The analysis takes into account 17 patterns reflecting particular volumes. The k-nearest neighbours method is used as pattern classifier. The pattern recognition system was initially designed for an array of gas sensors and this paper describes its further development.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 498-501
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasi-Dynamic Testing of an Optical Sensor for Measurements of the Blood Chamber Volume in the POLVAD Prosthesis
Autorzy:
Konieczny, G.
Pustelny, T.
Marczyński, P.
Powiązania:
https://bibliotekanauki.pl/articles/1399377.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.-e
42.81.-i
07.07.Df
47.63.Cb
Opis:
The article presents further developments of an optical system to be used in temporary blood volume measurements in the Polish ventricular assist device. The research focuses on quasi-dynamic measurements (flow rate of 5 ml/s). Characteristics of signals from selected configurations of optical transmitters and receivers are shown. A volume approximation using a PCA algorithm supported by a LRS function is introduced. Plans of further development are stated.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 483-485
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Researches on the Spectral Transmittance of Zinc Oxide ZnO Semiconductor Layers
Autorzy:
Struk, P.
Pustelny, T.
Opilski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1506851.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Hz
42.25.-p
42.82.Et
68.35.Ct
Opis:
The paper deals with investigations concerning a wide-band gap material, viz. zinc oxide ZnO. Special attention has been devoted to the determination of the spectral transmission of zinc oxide layers deposited on quartz substrates. These investigations have made it possible to determine the optical spectral range in which this material is transparent as well as the edges of absorption. The presented investigations are valuable particularly concerning the application of zinc oxide in optoelectronic and photonic structures as well as in systems of waveguides and sensor layers of integrated optics.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1239-1241
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pattern Recognition Applied to Analysis of Gas Sensors Array Data
Autorzy:
Marczyński, P.
Szpakowski, A.
Tyszkiewicz, C.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/1418023.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.50.Sk
07.07.Df
Opis:
For an array of eight chemoresistive gas sensors a computer pattern recognition system was built. Multivariate data analysis was performed for measurements of three gases' dilutions: hydrogen $(H_2)$, methane $(CH_4)$, and carbon monoxide $(CO)$. The pattern recognition system included a feature subset selection algorithm involving PCA and objective function. Dimensionality reduction was applied to two kinds of patterns: three aforementioned gases and six different concentrations of hydrogen. For patterns of the three gases, classification tests were performed using k-NN algorithm and N-fold based validation method.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 847-849
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Anatomic Structure of Pulmonary Arteries as a Source of Unreliability in Thermodilution Cardiac Output Measurement
Autorzy:
Gawlikowski, M.
Pustelny, T.
Przywara-Chowaniec, B.
Struk, P.
Powiązania:
https://bibliotekanauki.pl/articles/1811516.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.63.Cb
07.05.Tp
87.19.Uv
Opis:
One of the most fundamental examination in intensive care medicine is cardiac output measurement, realized by pulmonary artery catherization. The thermodilution cardiac output estimation method is not resistant to various kinds of disturbances, which significantly decreases its sensitivity and specificity. The paper depicts investigations related to analysis of presumable new source of unreliability - asymmetric blood flow through pulmonary vessels. The investigations consisted of two phases: clinical examination (to obtain anatomical data) and computer modeling (to simulate the flow symmetry).
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-81-A-89
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gas Sensors Based on ZnO Structures
Autorzy:
Struk, P.
Pustelny, T.
Gołaszewska, K.
Borysiewicz, M.
Piotrowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399403.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Hz
42.25.-p
42.82.Et
68.35.Ct
Opis:
The paper presents the results of investigations concerning sensor structures based on porous layers of zinc oxide (ZnO) sensitive to a selected gaseous environment. The investigations comprised analyses of the influence of the gaseous environment on the optical properties of a sensor structure, in particularly on the change of the spectral characteristics of optical transmission within the range of ultraviolet light and in the visible range. These presented investigations were carried out in such a gaseous environment as nitrogen dioxide $NO_2$ in synthetic air.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 567-569
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zinc Oxide Semiconductor for Photonics Structures Applications
Autorzy:
Struk, P.
Pustelny, T.
Pustelny, B.
Gołaszewska, K.
Kamińska, E.
Piotrowska, A.
Borysiewicz, M.
Ekielski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1506857.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Hz
42.70.-a
42.82.-m
68.35.Ct
Opis:
The paper presents investigations concerning the analysis of photonic structures with grating couplers. In the paper basic theoretically information on photonic structures with grating couplers is presented. The results of numerical investigations on photonic structures with grating couplers are discussed, too. Investigations show an essential influence of the geometrical parameters of grating couplers on the effectiveness of the input and output of optic power into and out of this photonic structure. In the paper the selected results of experimental realizations of photonic structures with grating couplers based on zinc oxide ZnO are presented.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1242-1245
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical investigations of ZnO layers affected by some selected gases in the aspect of their application in optical gas sensors
Autorzy:
Struk, P.
Pustelny, T.
Gołaszewska, K.
Borysiewicz, M. A.
Piotrowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/200967.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ZnO
semiconductor
gas sensors
Zno
czujniki gazu
półprzewodnik
Opis:
The paper presents the results of investigations of zinc oxide (ZnO) layers as a potential sensing material, being affected by certain selected gaseous environments. The investigations concerned the optical transmission through thin ZnO layers in wide spectral ranges from ultraviolet to the near infrared. The effect of the gaseous environment on the optical properties of zinc oxide layers with a thickness of ~ 400 nm was analyzed applying various technologies of ZnO manufacturing. Three kinds of ZnO layers were exposed to the effect of the gaseous environment, viz.: layers with relatively slight roughness (RMS several nm), layers with a considerable surface roughness (RMS some score of nm) and layers characterized by porous ZnO structures. The investigations concerned spectral changes in the transmission properties of the ZnO layers due to the effect of such gases as: ammonia (NH3), hydrogen (H2), and nitrogen dioxide (NO2) in the atmosphere of synthetic air. The obtained results indicated the possibility of applying porous ZnO layered structures in optical gas sensors.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 4; 829-836
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Results of Experiments with Fiber Pressure Sensor Applied in the Polish Artificial Heart Prosthesis
Autorzy:
Konieczny, G.
Opilski, Z.
Pustelny, T.
Gacek, A.
Gibinski, P.
Kustosz, R.
Powiązania:
https://bibliotekanauki.pl/articles/1506799.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.-e
42.81.-i
07.07.Df
47.63.Cb
Opis:
The following paper introduces the problem of noninvasive pressure measurements in Polish artificial heart prosthesis. The pressure sensor is proposed and introduced, and preliminary tests are shown. The paper deals with the proposed sensing elements, requirement noninvasive solution and preliminary tests of polyurethane membrane transmission. The paper includes also experimental results of a fiber pressure sensor introducing noninvasive pressure measurements with pressure transmission through a polyurethane tube wall.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1183-1185
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ZnO - Wide bandgap semiconductor and possibilities of its application in optical waveguide structures
Autorzy:
Struk, P.
Pustelny, T.
Gołaszewska, K.
Borysiewicz, M. A.
Kamińska, E.
Wojciechowski, T.
Piotrowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/220412.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Wide band gap oxide semiconductors
ZnO
integrated optics structures
planar waveguides
Opis:
The paper presents the results of investigations concerning the application of zinc oxide - a wideband gap semiconductor in optical planar waveguide structures. ZnO is a promising semiconducting material thanks to its attractive optical properties. The investigations were focused on the determination of the technology of depositions and the annealing of ZnO layers concerning their optical properties. Special attention was paid to the determination of characteristics of the refractive index of ZnO layers and their coefficients of spectral transmission within the UV-VIS-NIR range. Besides that, also the mode characteristics and the attenuation coefficients of light in the obtained waveguide structures have been investigated. In the case of planar waveguides, in which the ZnO layers have not been annealed after their deposition, the values of the attenuation coefficient of light modes amount to a ≈ 30 dB/cm. The ZnO layers deposited on the heated substrate and annealed by rapid thermal annealing in an N2 and O2 atmosphere, are characterized by much lower values of the attenuation coefficients: a ≈ 3 dB/cm (TE0 and TM0 modes). The ZnO optical waveguides obtained according to our technology are characterized by the lowest values of the attenuation coefficients a encountered in world literature concerning the problem of optical waveguides based on ZnO. Studies have shown that ZnO layers elaborated by us can be used in integrated optic systems, waveguides, optical modulators and light sources.
Źródło:
Metrology and Measurement Systems; 2014, 21, 3; 401-412
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of GaN Nanocolumns Grown by Plasma - Assisted MBE on Si (111) Substrates
Autorzy:
Zytkiewicz, Z.
Dluzewski, P.
Borysiuk, J.
Sobanska, M.
Klosek, K.
Witkowski, B.
Setkiewicz, M.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/1492480.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Hi
81.05.Dz
61.46.Km
Opis:
We report on growth of GaN nanocolumns by plasma assisted MBE on (111) silicon substrates and on their characterization. The nanocolumns nucleate on the substrate spontaneously without use of any catalyst, probably by the Volmer-Weber mechanism. Transmission electron microscopy analysis shows high crystalline quality of GaN nanocolumns and their good alignment with the c-axis being perpendicular to the substrate. Preliminary results on use of GaN nanocolumns in gas sensor devices are presented.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-015-A-016
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Planar Optical Waveguides Based on Thin ZnO Layers
Autorzy:
Struk, P.
Pustelny, T.
Gut, K.
Gołaszewska, K.
Kamińska, E.
Ekielski, M.
Pasternak, I.
Łusakowska, E.
Piotrowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1807757.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Hz
42.25.-p
42.70.-a
42.82.-m
42.82.Et
68.35.Ct
Opis:
The paper quotes the results of investigations concerning planar optical waveguides with a high value of the refractive index, achieved basing on a broad-band gap semiconductor ZnO, deposited on glass or quartz substrates. The investigations were focused on the properties of the waveguides, determining the modal characteristics, the attenuation coefficient and the structure of the surface.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 414-418
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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