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1
Content available remote

Surface Potential Investigations of Indium Phosphate Real Surfaces by Means of Transverse Acoustoelectric Method

100%
Pustelny T.
Acta Physica Polonica A
|
1995
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vol. 88
|
issue 6
1123-1132
EN
A method of surface potential determination in semiconductors by means of the transverse acoustoelectric effect is described. The results of theoreti­cal analysis of the transverse acoustoelectric voltage versus surface potential and different surface electrical parameters in indium phosphate single crys­tals are presented. The experimental results of the surface potential inves­tigations have been obtained after various surface treatments in InP(110) and InP(100) crystals. A strong influence of the chemical and mechanical surface treatments upon the surface potential values has been observed from the measurements. The surface InP(110) was more sensitive to different sur­face treatments. The changes of the surface potential values were about two times greater for InP(110) than for InP(100) samples. The surface potentials after surface treatments obtained by the acoustics method were of the range -0.08 [V] to -0.22 [V].
2
Content available remote

Analysis of the Responses of Metal-Oxide Semiconductor Nanostructures to Nitrogen Dioxide

64%
Procek M., Pustelny T.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
529-533
EN
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.
3
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Transverse Acoustoelectric Effect Applying in Surface Study of GaP:Te(111)

64%
Pustelny B., Pustelny T.
Acta Physica Polonica A
|
2009
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vol. 116
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issue 3
383-384
EN
The possibility of using the transverse acoustoelectric phenomena in experimental investigations of near surface region in semiconductor crystals was discussed. The results of experimental investigations of GaP:Te(111) surfaces by means of the transverse acoustoelectric voltage were presented. Applying the transverse acoustoelectric voltage method, the lifetime τ of minority carrier in the near-surface region and the surface potential V_{s} in GaP:Te(111) surfaces after their different technological treatments were determined.
4
Content available remote

Numerical Investigation of the Photonic-Crystal Fibres with Suspended Core

64%
Pustelny T., Grabka M.
Acta Physica Polonica A
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2009
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vol. 116
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issue 3
385-388
EN
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.
5
Publication available in full text mode
Content available

Design and numerical analyses of the planar grating coupler

64%
Struk P., Pustelny T.
Bulletin of the Polish Academy of Sciences: Technical Sciences
|
2010
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issue 4
6
Publication available in full text mode
Content available

Analysis of actual accuracy in cardiac output measurements by means of thermodilution

64%
Gawlikowski M., Pustelny T.
Bulletin of the Polish Academy of Sciences: Technical Sciences
|
2012
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issue 3
7
Content available remote

Photonic-Crystal Fibres with Suspended Core - Numerical Analyses

64%
Pustelny T., Grabka M.
Acta Physica Polonica A
|
2008
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vol. 114
|
issue 6A
A-115-A-120
EN
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.
8
Content available remote

Preliminary Research of an Optical Sensor for Measurements of the Blood Chamber Volume in the POLVAD Prosthesis

64%
Konieczny G., Pustelny T.
Acta Physica Polonica A
|
2012
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vol. 122
|
issue 5
962-965
EN
The article presents preliminary research of an optical system for using in the temporary blood volume measurements in the Polish Ventricular Assist Device (POLVAD). The basis for the proposed solution is the measurement of the light reflected from the membrane in different configurations of light emitters and light detectors. The paper is describing a proposed measurement technique, measurement circuit and preliminary static measurements results of the developed measurement system. Future development plans are stated.
9
Content available remote

Physical Model of the Pulmonary Circulation Designed for Investigation on Cardiac Output Measurement by Means of the Thermodilution Method

64%
Gawlikowski M., Pustelny T.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
798-802
EN
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.
10
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Content available

Surface acoustic wave hydrogen gas sensor based on layered structure of palladium/metal-free phthalocyanine

52%
Jakubik W. P., Urbańczyk M., Maciak E., Pustelny T.
Bulletin of the Polish Academy of Sciences: Technical Sciences
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2008
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vol. 56
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issue 2
11
Content available remote

Research on Pattern Recognition Applied for Volume Estimation of Blood Chamber with Matrix of Optical Sensors

52%
Marczyński P., Konieczny G., Pustelny T.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
498-501
EN
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.
12
Content available remote

The New Sensing Fibre for Application in Optical Fibre Current Sensor

52%
Barczak K., Pustelny T., Dorosz D., Dorosz J.
Acta Physica Polonica A
|
2008
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vol. 114
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issue 6A
A-3-A-6
EN
The present paper deals with investigations concerning optical fibre current sensors. They are mainly applied in measurements of the intensity of the electric current in the power lines as so-called optical transformers of the electrical current. The most important advantages of fibre current sensors are: safety of service, insulating power as well as their insensitiveness to electromagnetic interference. The investigations were concentrated on designing of adequate sensing fibre, and particularly on the choice of an adequate kind of glass, of which this fibre could be made. Besides, also the head of the fibre current sensor was designed, basing on the suggested and produced sensing fibre. The paper presents the results of magneto-optic tests of the glass and the sensing fibre.
13
Content available remote

Clinical Studies of Rheocardiography Application to Hemodynamic Monitoring of Patients with Dilated Cardiomyopathy

52%
Przywara-Chowaniec B., Poloński L., Gawlikowski M., Pustelny T.
Acta Physica Polonica A
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2009
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vol. 116
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issue 3
380-382
EN
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.
14
Content available remote

Optical Fibre Current Sensor for Electric Power Industry

52%
Barczak K., Pustelny T., Dorosz D., Dorosz J.
Acta Physica Polonica A
|
2010
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vol. 118
|
issue 6
1087-1089
EN
The paper deals with the optical fibre current sensor based on new optical fibre made of glass with a high value of refractive index. This kind of glass was developed to meet the requirements of these optical fibres. The aim of investigations was to develop a new optical fibre with adequate magneto-optical properties and a relatively weak linear birefringence resulting from the process of its production. These features are of essential importance for optical fibre current sensors. The results of investigations concerning such optical fibres have been presented, displaying satisfactory magneto-optical properties, as well as only low linear birefringence induced by stresses arising in the course of their manufacturing.
15
Content available remote

Model Study of Cardiac Output Measurement by Thermodilution in Thermal Instability

52%
Gawlikowski M., Pustelny T., Przywara-Chowaniec B., Nowak-Gawlikowska J.
Acta Physica Polonica A
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2010
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vol. 118
|
issue 6
1124-1126
EN
Cardiac output is one of the most valuable hemodynamic parameter. It is measured commonly with intravascular pressures by pulmonary artery catheterization technique. The cardiac output itself is measured by dilution of thermal marker method (thermodilution), which is not resistant for various disturbances. In this paper the influence of blood temperature on metrological properties of thermal dilution method was described.
16
Content available remote

Quasi-Dynamic Testing of an Optical Sensor for Measurements of the Blood Chamber Volume in the POLVAD Prosthesis

52%
Konieczny G., Pustelny T., Marczyński P.
Acta Physica Polonica A
|
2013
|
vol. 124
|
issue 3
483-485
EN
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.
17
Content available remote

The Influence of the Rotational Speed of the Polymer SU8 on the Thickness of the Waveguide Layer

52%
Gut K., Pustelny T., Nabagło D.
Acta Physica Polonica A
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2010
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vol. 118
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issue 6
1136-1138
EN
The paper presents results of investigations concerning the measurement of the refractive index and thickness of planar waveguide structures, obtained by the photopolymerization of polymer SU8. Sodium-calcium glass was used as the substrate. As the knowledge of the quoted parameters is from the viewpoint of the structure of various types of optical sensors of crucial importance, the way of their determination has been presented. The paper deals also with the method of constructing planar polymer waveguides, taking into account problems connected with their adhesion to glass substrates.
18
Content available remote

Sensitivity of Polarimetric Waveguide Interferometer for Different Wavelengths

52%
Gut K., Zakrzewski A., Pustelny T.
Acta Physica Polonica A
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2010
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vol. 118
|
issue 6
1140-1142
EN
This publication presents experimental measurement methodology which allows to determine the characteristics of sensitivity planar differential interferometer. To confirm data reliability additional measurements were done such as simulations in OptiBPM software by Optiwave. Curves received from two methods: experimental and theoretical, were summed up and compared. Conclusions were made on their basis, for example the influence of used wavelengths or refractive index of single mode waveguide cladding on curves of sensitivity differential interferometer using planar waveguide received from the ion exchange method.
19
Content available remote

Optical Sensor for Measurements of the Blood Chamber Volume in the POLVAD Prosthesis - Static Measurements

52%
Konieczny G., Pustelny T., Marczyński P.
Acta Physica Polonica A
|
2013
|
vol. 124
|
issue 3
479-482
EN
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.
20
Content available remote

Bilayer Structures of NiO_{x} and Pd in Surface Acoustic Wave and Electrical Gas Sensor Systems

52%
Jakubik W., Urbańczyk M., Maciak E., Pustelny T.
Acta Physica Polonica A
|
2009
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vol. 116
|
issue 3
315-320
EN
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.
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