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Tytuł:
Photonic-Crystal Fibres with Suspended Core - Numerical Analyses
Autorzy:
Pustelny, T.
Grabka, M.
Powiązania:
https://bibliotekanauki.pl/articles/1811518.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ls
07.07.Df
42.79.Pw
42.81.-i
Opis:
The paper gives a short description of light guidance mechanisms of index-guided photonic-crystal fibres. The results of numerical analyses of photonic-crystal fibres with a suspended core are presented. Such fibres are planned to be applied for investigation of magneto-optic effects in gaseous media.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-115-A-120
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Investigation of the Photonic-Crystal Fibres with Suspended Core
Autorzy:
Pustelny, T.
Grabka, M.
Powiązania:
https://bibliotekanauki.pl/articles/1807751.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Qs
42.81.Qb
42.81.-i
42.81.Pa
07.60.Vg
Opis:
The photonic-crystal fibre with a suspended core was analyzed in order to explain possibilities of its using in investigation of electrooptic and magnetooptic effects occurring in the molecules of gas passed into air holes in the fibre. As results from numerical analysis, even 20% of electromagnetic optical energy can be propagating in the area of the air holes. The obtained results indicate the possibility of scanning the electrooptic and magnetooptic effects in photonic-crystal fibres with a suspended core in the case of considerable diminishing of the core (even below 1 μm) or in the case of light applying with its larger wavelengths.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 385-388
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of limited dynamic response of the indicator detector in a Swan-Ganz catheter on the overestimation of cardiac output measurement by means of thermodilution
Autorzy:
Gawlikowski, M.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/221141.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cardiac output measurement
thermodilution method
Swan-Ganz catheter
Opis:
Nowadays the "gold clinical standard" of hemodynamics diagnostic and cardiac output measurements is pulmonary artery catheterization by means of the Swan-Ganz catheter and thermodilution. The method itself is sensitive to numerous disturbances which cause inaccurate results. One of the well-known disadvantages of thermodilution is the overestimation of results at low values of cardiac output. This effect may concern the limited slew rate of the thermoelement mounted at the tip of the catheter. In this paper the relationship between the dynamic response of the thermoelement and the uncertainty of cardiac output measurements by means of thermodilution has been investigated theoretically and experimentally.
Źródło:
Metrology and Measurement Systems; 2012, 19, 4; 751-758
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of actual accuracy in cardiac output measurements by means of thermodilution
Autorzy:
Gawlikowski, M.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/201601.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cardiac output
hemodynamics monitoring
thermodilution
Opis:
The essential examination in hemodynamic monitoring of the patient is the cardiac output (CO) measurement. Nowadays, in clinical practice the most popular method is indicator dilution, particularly thermodilution. It is realized by applying the Swan-Ganz catheter and observing changes of the indicator concentration. This method is sensitive to many factors and the obtained results should be treated cautiously. The paper presents theoretical and experimental studies of metrological phenomena in CO measurements by means of thermodilution, paying special attention to medical aspects of the measurements. It has been pointed out that the actual unreliability of the mentioned method reaches values from 20% to 45%, which is in opposition to the technical data of patient's monitors (typical accuracy about 5%).
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 581-587
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Responses of Metal-Oxide Semiconductor Nanostructures to Nitrogen Dioxide
Autorzy:
Procek, M.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/1399393.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.47.Rs
07.07.Df
Opis:
The paper concerns analyses of the nanostructures based on metal-oxide semiconductors, such as titanium dioxide $(TiO_2)$ and zinc oxide $(ZnO)$ exposed to nitrogen dioxide $(NO_2)$ in an atmosphere of dry and humid synthetic air. The investigations were performed at a rather low temperature amounting to 120°C. The responses of sensors differing in the morphology of their structures have been compared. Also the time of their responses were compared with each other. The paper describes theoretically changes in the effective resistance of these structures due to the interaction of the gas. The presented results are being discussed based on the analysis of physical and chemical phenomena.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 529-533
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical Model of the Pulmonary Circulation Designed for Investigation on Cardiac Output Measurement by Means of the Thermodilution Method
Autorzy:
Gawlikowski, M.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/1493354.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.19.Hh
47.63.Ec
82.60.Fa
Opis:
The "gold clinical standard" of cardiac output measurements is the thermodilution method, implemented by the Swan-Ganz catheter. The unreliability of obtained results is difficult to estimate experimentally, due to the lack of reference methods or the risk of serious interferences in the measured object. Moreover, the pulsating blood flow produced by the heart is difficult to measure. Therefore it is advisable to develop the physical model of the pulmonary circulation, designed to investigate the accuracy of cardiac output measurements by means of the thermodilution method.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 798-802
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical and Experimental Analysis of the Response of a SAW Structure with WO3 Layers on Action of Carbon Monoxide
Autorzy:
Hejczyk, T.
Urbańczyk, M.
Pustelny, T.
Jakubik, W.
Powiązania:
https://bibliotekanauki.pl/articles/176885.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gas sensor
carbon monoxide (CO)
piezoelectric substrate
numerical modeling
surface acoustic waves
acoustoelectric effects
Ingebrigtsen's formula
Opis:
The paper presents the results of an analysis of gaseous sensors based on a surface acoustic wave (SAW) by means of the equivalent model theory. The applied theory analyzes the response of the SAW sensor in the steady state affected by carbon monoxide (CO) in air. A thin layer of WO3 has been used as a sensor layer. The acoustical replacing impedance of the sensor layer was used, which takes into account the profile of the concentration of gas molecules in the layer. Thanks to implementing the Ingebrigtsen equation, the authors determined analytical expressions for the relative changes of the velocity of the surface acoustic wave in the steady state. The results of the analysis have shown that there is an optimum thickness of the layer of CO sensor at which the acoustoelectric effect (manifested here as a change in the acoustic wave velocity) is at its highest. The theoretical results were verified and confirmed experimentally.
Źródło:
Archives of Acoustics; 2015, 40, 1; 19-24
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical model for analysis of spatial characteristics of ultrasound heads
Autorzy:
Szpakowski, A.
Pustelny, T.
Ochocki, M.
Powiązania:
https://bibliotekanauki.pl/articles/332278.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
ultrasound head
acoustics
Opis:
The paper presents the physical base of the numerical system for analysis and modelling acoustic fields generated by an acoustic head of arbitrary construction. The elaborated system allows to analyse the sending-receiving multielements ultrasound heads. In the paper modeling of the acoustic system as the linear one was proposed. Numerical model, its implementation and preliminary results was presented.
Źródło:
Hydroacoustics; 2003, 6; 177-182
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of changes in electrical resistance of zinc oxide nanostructures under the influence of variable gaseous environments
Autorzy:
Procek, M.
Pustelny, T.
Stolarczyk, A.
Maciak, E.
Powiązania:
https://bibliotekanauki.pl/articles/201073.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zinc oxide
ZnO
flower-like nanostructures
gas sensor
wide gap semiconductors
electric properties of semiconductors
tlenek cynku
kwiatopodobne nanostruktury
czujnik gazu
właściwości elektryczne półprzewodników
Opis:
The paper deals with the investigations concerning the influence of the changing gas environment on electrical resistance of zinc oxide (ZnO) nanostructures. The investigated structures are wide-gap semiconductors with the morphology of ZnO flower-shaped agglomerates of nanostructures. The resistance changes of these nanostructures were tested under the influence of various gases such as nitrogen dioxide (NO2), hydrogen (H2), ammonia (NH3) and also of humidity changes of carrier gases. To clarify the mechanisms of physicochemical processes in ZnO nanostructures during their interaction with gaseous environments, investigations were performed in two different carrier gases, viz. in synthetic air and in nitrogen. The study was carried out at a structure temperature of 200◦C.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 635-639
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Clinical Studies of Rheocardiography Application to Hemodynamic Monitoring of Patients with Dilated Cardiomyopathy
Autorzy:
Przywara-Chowaniec, B.
Poloński, L.
Gawlikowski, M.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/1807749.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.63.Cb
87.19.U-
Opis:
Impedance cardiography is a non-invasive, cheap and easy to use method of long term hemodynamic monitoring. Nowadays this method is perceived as an alternative for invasive monitoring of the patients. The goal of the presented papers was to compare the results of rheocardiography with reference invasive monitoring.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 380-382
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Planar Optical Waveguides for Application in Optoelectronic Gas Sensors
Autorzy:
Golaszewska, K.
Kamińska, E.
Pustelny, T.
Struk, P.
Piotrowski, T.
Piotrowska, A.
Ekielski, M.
Kruszka, R.
Wzorek, M.
Borysiewicz, M.
Pasternak, I.
Gut, K.
Powiązania:
https://bibliotekanauki.pl/articles/1811559.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.82.Et
07.07.Df
42.79.Pw
81.15.-z
Opis:
In the paper, the results of technological investigations on planar optical waveguides based on high band gap oxide semiconductors were presented. Investigations concerned the technologies of depositing very thin layers of: zinc oxide ZnO, titanium dioxide $TiO_2$ and tin dioxide $SnO_2$ on substrates of quartz glass plates. There were investigated both morphological structures of the produced layers and their optical properties. The paper also presents investigations on the technology of input-output light systems in the Bragg grating structures.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-223-A-230
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bilayer Structures of $NiO_{x}$ and Pd in Surface Acoustic Wave and Electrical Gas Sensor Systems
Autorzy:
Jakubik, W.
Urbańczyk, M.
Maciak, E.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/1795797.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.25.Fe
77.65.Dq
43.35.Pt
68.35.Iv
07.07.Df
Opis:
A bilayer sensor structure of nickel oxide $NiO_x$ ( ≈ 60 nm) with a very thin film of palladium (Pd ≈ 18 nm) on the top, has been studied for gas-sensing application at relatively low temperatures of about 30°C and 60°C. The bilayer structure was obtained by rf sputtering and by vacuum deposition (first the $NiO_{x}$ and then the Pd film) onto a $LiNbO_{3}$ Y-cut Z-propagating substrate, making use of the surface acoustic wave method, and additionally (in the same technological processes) onto a glass substrate with a planar microelectrode array for simultaneous monitoring of the planar resistance of the layered structure. Such a bilayer structure was investigated in a low concentration range (from 50 ppm to 400 ppm in air) of nitrogen dioxide $(NO_{2})$, carbon monoxide (CO) and ammonia $(NH_{3})$ in a dry and wet air atmosphere and in a medium hydrogen concentration (1-2.5%) in dry air. The $NiO_{x}$ and Pd bilayer structure interact rather weakly with $NO_{2}$ molecules but with CO and $NH_{3}$ this interaction is much greater, especially at higher temperature ( ≈ 60°C). The hydrogen sensitivity is on the medium level, not exceeding 600 Hz (relative change in the differential frequency of ≈ 2.3%) at interaction temperature of 35°C.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 315-320
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wielokanałowy, optoelektroniczny system do pomiaru stężenia gazów
The multichannel, optoelectronic gas sensor system based on interferometric nanostructures with gasochromic thin films
Autorzy:
Maciak, E.
Opilski, Z.
Pustelny, T.
Urbańczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/154779.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
optyczny czujnik gazu
optoelektroniczny system pomiarowy
nanostruktura sensorowa
optical gas sensor
optoelectronic gas sensor system
sensing nanostructure
optical interferometric structure
Opis:
W pracy przedstawiono nowatorski wielokanałowy, optoelektroniczny system pomiarowy i sposób pomiaru stężenia gazów przemysłowych i toksycznych. Mierzony analit gazowy może być różny w zależności od zastosowanej interferencyjnej nanostruktury sensorowej. Pomiar odbywa się w gazowym środowisku pomiarowym. Niniejsze rozwiązanie optoelektronicznego, gazowego systemu pomiarowego wykorzystuje interferencyjne, optyczne nanostruktury sensorowe zawierające w swej konstrukcji cienkie warstwy receptorowe z optycznie czynnych materiałów. Zatem, optyczna głowica sensorowa zmienia swoje parametry optyczne w wyniku oddziaływania z badanym analitem gazowym.
In the paper the multichannel, optoelectronic gas sensor system based on interferometric, gasochromic nanostructures is presented. The silicon colour sensor TCS230 detects the intensity and change of colour coordinates RGB of an optical signal resulting from exposure of the sensing structure to a specific type of gas. Using multichannel measurement, one can simultaneously detect different gas or analyte molecules in the sample by immobilizing different optical receptor thin films (nanostructures) at different channels. Each optical sensing channel consists of three parts: the input port which includes a broadband light source: "warm" white LED, multi-layered sensing nanostructure: interferometric and gasochromic, the output port including a silicon colour sensor TCS230 detecting the intensity and change of colour coordinates RGB of an optical signal resulting from the sensing structure exposure to a specific type of gas. At the sensing window, on the glass substrate there are immobilized nanostructures being chemo-optical, gasochromic and interferometric transducer receptors, which can selectively interact with a specific type of gas molecules present in the gas mixture. When a physical-chemical binding process takes place on the sensing window of the measuring channel, an interferometric colour of the sensing element (nanostructure) changes and colour coordinates of the measured optical signal change as well. The change of the colour coordinates is proportional to the change of the effective refractive index of the receptor structure (particularly refractive index of the resonance cavity). By measuring the intensity change of the optical signal RGB, the refractive index change ?n taking place in the measuring window can be calculated and the concentration of a specific gas in the gas mixture can be measured.
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 7, 7; 799-802
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic System of Determining the Instantaneous Volume of the Blood Part of the Ventricular Assist Device POLVAD-EXT
Autorzy:
Konieczny, G.
Pustelny, T.
Opilski, Z.
Gawlikowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/176599.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic Helmholtz’s
resonator
blood volume estimation
VAD
ventricular assist device
Opis:
The paper presents the results of investigations concerning the noninvasive method of estimating the actual volume of the blood chamber of the POLVAD-EXT type ventricular assist device (VAD) during its operation. The proposed method is based on the principle of Helmholtz’s acoustic resonance. Both the theory, main stages of the development of the measurement method as well as the practical implementation of the proposed method in the physical model of the POLVAD-EXT device are dealt with. The paper contains the results of static measurements by means of the proposed method (conducted at the Department of Optoelectronics, Silesian University of Technology) as well as the dynamic measurements taken at the Foundation of Cardiac Surgery Development (Zabrze, Poland) with the professional model of the human cardiovascular system. The results of these measurements prove that the proposed method allows to estimate the actual blood chamber volume with uncertainties below 10%.
Źródło:
Archives of Acoustics; 2014, 39, 4; 541-548
0137-5075
Pojawia się w:
Archives of Acoustics
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
Wyświetlanie 1-15 z 32

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