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Wyświetlanie 1-15 z 38
Tytuł:
Dimensional Crossovers in Magnetoresistance of Submicron Films and Wires of CdTe:In
Autorzy:
Jaroszyński, J.
Wróbel, J.
Sawicki, M.
Skośkiewicz, T.
Karczewski, G.
Wojtowicz, T.
Kossut, J.
Dietl, T.
Kamińska, E.
Papis, E.
Piotrowska, A.
Duś, R.
Nowakowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1952536.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Jv
Opis:
We present millikelvin studies of magnetoresistance for epitaxial films and wires of CdTe:In. In comparison to the data with theoretical predictions for the weakly localized regime we put into the evidence the presence of the temperature-induced dimensional crossovers in the studied systems. Our measurements probe the electron phase-breaking rate and indicate that the main dephasing mechanism arises from electron scattering from thermal fluctuations of three- or two-dimensional electron liquid.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 1027-1031
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetotransport through Nanoconstriction in Ferromagnetic Semiconductor (Ga,Mn)As
Autorzy:
Figielski, T.
Wosiński, T.
Pelya, O.
Sadowski, J.
Morawski, A.
Mąkosa, A.
Dobrowolski, W.
Jagielski, J.
Wróbel, J.
Powiązania:
https://bibliotekanauki.pl/articles/2035752.pdf
Data publikacji:
2003-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.63.-b
75.60.-d
73.20.Fz
Opis:
We studied narrow (submicron) constrictions in the layers of ferromagnetic semiconductor (Ga,Mn)As. We have demonstrated a contribution of the quantum localization effects to the magnetoresistance of the constricted samples. We have also found a negative contribution of a domain wall trapped in the constriction to the resistance, due presumably to the erasing of the localization effects by the domain wall.
Źródło:
Acta Physica Polonica A; 2003, 103, 6; 525-531
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conductance Fluctuations in Quantum Wires of n-CdTe and n-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te
Autorzy:
Jaroszyński, J.
Wróbel, J.
Sawicki, M.
Skośkiewicz, T.
Karczewski, G.
Wojtowicz, T.
Kossut, J.
Dietl, T.
Kamińska, E.
Papis, E.
Barcz, A.
Piotrowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1934061.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Rn
73.61.Ga
73.20.Fz
Opis:
We present millikelvin studies of magnetoconductance in submicron wires of In-doped n$\text{}^{+}$-CdTe and n$\text{}^{+}$-Cd$\text{}_{0.99}$Mn$\text{}_{0.01}$Te epilayers. Weak-field magnetoresistance which arises from quantum localization as well as universal conductance fluctuations have been observed. The exchange coupling to magnetic impurities is shown to decrease the correlation field of the fluctuations. This novel effect is interpreted by invoking a new driving mechanism of the magnetoconductance fluctuations - the redistribution of the electrons between energy levels of the system, induced by the giant s-d spin-splitting of the electronic states.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 1000-1004
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magneto-Transport Characterization of Four-Arm Nanostructure Based on Ferromagnetic (Ga,Mn)As
Autorzy:
Andrearczyk, T.
Wosiński, T.
Figielski, T.
Mąkosa, A.
Tkaczyk, Z.
Łusakowska, E.
Wróbel, J.
Sadowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811912.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.Jt
75.50.Pp
75.30.Gw
75.60.Ch
Opis:
We report on results of magneto-transport measurements performed on four-arm nanostructure fabricated from p-type ferromagnetic $Ga_{0.92}Mn_{0.08}As$ layer. The results reveal hysteresis-like behaviors of low field magnetoresistance. We interpret the magnetoresistance in terms of domain walls, which are expected to be trapped inside the nanostructure at some particular positions and which contribute to the total resistance.
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 1049-1054
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetization Steps in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te Observed in Coherent Transport
Autorzy:
Jaroszyński, J.
Dietl, T.
Wróbel, J.
Karczewski, G.
Wojtowicz, T.
Kossut, J.
Maude, D. K.
van der Linden, P.
Portal, J. C.
Powiązania:
https://bibliotekanauki.pl/articles/1968114.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Rn
73.61.Ga
73.20.Fz
Opis:
Magnetoconductance measurements on submicron wires of n$\text{}^{+}$-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te were carried out up to 27 T and down to 100 mK. The inverse correlation field of the universal conductance fluctuations is found to increase abruptly in the vicinity of the magnetization steps due to Mn pairs in CdMnTe. No such effect is observed in similar wires of CdTe. These findings support a recent model, according to which the correlation field of the universal conductance fluctuations in magnetic systems is inversely proportional to the magnetic susceptibility of the localized spins.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 797-800
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Hall Ferromagnet in Magnetically-Doped Quantum Wells
Autorzy:
Andrearczyk, T.
Jaroszyński, J.
Wróbel, J.
Karczewski, G.
Wojtowicz, T.
Papis, E.
Kamińska, E.
Piotrowska, A.
Popović, D.
Dietl, T.
Powiązania:
https://bibliotekanauki.pl/articles/2036881.pdf
Data publikacji:
2003-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.43.Nq
72.25.Dc
73.61.Ga
75.50.Pp
Opis:
The article reviews our recent studies on quantum Hall ferromagnetism in diluted magnetic semiconductors. We carried out magnetoresistance studies on modulation-doped, gated heterostructures of (Cd,Mn)Te/(Cd,Mg)Te:I. We put into evidence the formation of Ising quantum Hall ferromagnet with Curie temperature T$\text{}_{C}$ as high as 2 K. Quantum Hall ferromagnetism is manifested by anomalous magnetoresistance maxima. Moreover, magnitude of these spikes depends dramatically on the history of the sample, shows hysteresis when either magnetic field or gate voltage are swept, stretched-exponential time evolution characteristic of glassy systems, and strong Barkhausen noise. Our study suggests that these metastabilities stem from the slow dynamics of ferromagnetic domains.
Źródło:
Acta Physica Polonica A; 2003, 104, 2; 93-102
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bistability of (Ga,Mn)As Ferromagnetic Nanostructures Due to the Domain Walls Switching
Autorzy:
Andrearczyk, T.
Wosiński, T.
Mąkosa, A.
Figielski, T.
Wróbel, J.
Sadowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1791342.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.Jt
75.50.Pp
75.30.Gw
75.60.Ch
85.75.-d
Opis:
We designed and investigated four-arm nanostructures, composed of two perpendicularly crossed stripes, fabricated from ferromagnetic (Ga,Mn)As layer by means of electron-beam lithography patterning and chemical etching. The nanostructures exhibit a bistable resistance behavior resulting from two configurations of magnetic domain walls in the central part of the structures. We demonstrate a possibility of switching between two stable resistance states in zero magnetic field by applying a pulse of either weak magnetic field or electric current through the structure.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 901-903
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neonatal surveillance system based on data stream technology
Autorzy:
Widera, M.
Matonia, A.
Wróbel, J.
Jeżewski, J.
Horoba, K.
Kupka, T.
Powiązania:
https://bibliotekanauki.pl/articles/333868.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
monitorowanie
pulsoksymetr
strumienie
monitoring
pulse oxymetry
streams
Opis:
Pulse oximetry is a non-invasive measurement method of an arterial blood oxygen saturation. Pulse oximeter is one of the main bedside monitors used in neonatal units. The dispersed location of medical devices in such unit renders impossible to make a fast and valid decision in the case of simultaneous alarming situation. This paper present hardware and software structure of centralised neonatal monitoring system. Presented system can work as a single central station for monitoring of up to twenty four patients. Application of central monitoring system decreases the risk of undetected patients live and health threats. Thanks to this system the medical stuff is less burdened by routine procedures; therefore the medical unit is perceived as child- and mother-friendly.
Źródło:
Journal of Medical Informatics & Technologies; 2005, 9; 93-98
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terahertz Response of a Point Contact Based on CdTe/CdMgTe Quantum Well in Magnetic Field
Autorzy:
Grigelionis, I.
Białek, M.
Grynberg, M.
Czapkiewicz, M.
Kolkovskiy, V.
Wiater, M.
Wojciechowski, T.
Wróbel, J.
Wojtowicz, T.
But, D.
Knap, W.
Łusakowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1409358.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.30.Hi
73.20.Mf
Opis:
A photoresponse at THz frequencies of a quantum point contact fabricated on a CdTe/CdMgTe quantum well was studied at low temperatures as a function of magnetic field. The spectra show a structure which was interpreted as resulting from the cyclotron resonance and magnetoplasmon excitations. The wavelength of the fundamental magnetoplasmon mode was found to be about 2 μm which coincides with one of dimensions of the point contact. We also discuss the possibility of coupling of magnetoplasmon modes to shallow impurity transitions in the quantum well.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 1069-1072
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Projective filtering based on L1-norm PC
Autorzy:
Przybyła, T.
Wróbel, J.
Pander, T.
Czabański, R.
Jeżewski, J.
Matonia, A.
Powiązania:
https://bibliotekanauki.pl/articles/332906.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
embedded space
projective filtering
nonlinear noise reduction
PCA
L1-norm PCA
przestrzeń osadzona
filtrowanie rzutowe
nieliniowa redukcja szumów
norma L1 PCA
Opis:
The paper presents a modification of nonlinear state-space projections (NSSP) method. The proposed approach deals with the sub-space estimation problem. In the original NSSP method, the principal component analysis (PCA) is used for the subspace determination. The classical PCA uses L2-norm. It is well known that the L2-norm is sensitive to outliers. Thus, in this paper the L1-norm PCA is proposed a subspace determination. In numerical experiments an analytic signal and real ECG signals are processed with the proposed method. The signals are contaminated with Gaussian distributed noise with different signal to noise ratio (SNR). Obtained results confirm the usefulness of the proposed modification.
Źródło:
Journal of Medical Informatics & Technologies; 2013, 22; 79-86
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The prediction of the low fetal birth weight based on quantitative description of cardiotocographic signals
Autorzy:
Czabański, R.
Jeżewski, M.
Wróbel, J.
Kupka, T.
Łęski, J.
Jeżewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/333495.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
weryfikacja podpisu online
programowanie dynamiczne
online signature verification
feature context
dynamic programming
Opis:
Cardiotocography (CTG) is a routine method of fetal condition assessment used in modern obstetrics. It is a biophysical method based on simultaneous recording and analysis of activity of fetal heart, fetal movements and maternal uterine contractions. The fetal condition is diagnosed on the basis of printed CTG trace evaluation. The correct interpretation of CTG traces from a bedside monitor is very difficult even for experienced clinicians. Therefore, computerized fetal monitoring systems are used to yield the quantitative description of the signal. However, the effective methods, aiming to support the conclusion generation, are still being searched. One of the most important features defining the state of fetal outcome is the weight of the newborn. The presented work describes an application of the Artificial Neural Network Based on Logical Interpretation of fuzzy if-then Rules (ANBLIR) to evaluate the risk of the low birth weight using a set of parameters quantitatively describing the CTG traces. The obtained results confirm that the neuro-fuzzy based CTG classification methods are very efficient for the prediction of the fetal outcome.
Źródło:
Journal of Medical Informatics & Technologies; 2008, 12; 97-102
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertical Electron Transport through PbS-EuS Structures
Autorzy:
Wrotek, S.
Dybko, K.
Morawski, A.
Mąkosa, A.
Wosiński, T.
Figielski, T.
Tkaczyk, Z.
Łusakowska, E.
Story, T.
Sipatov, A. Yu.
Szczerbakow, A.
Grasza, K.
Wróbel, J.
Palosz, W.
Powiązania:
https://bibliotekanauki.pl/articles/2036032.pdf
Data publikacji:
2003-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Ck
75.30.Et
Opis:
Temperature dependence of current-voltage I-V characteristics and resistivity is studied in ferromagnetic PbS-EuS semiconductor tunnel structures grown on n-PbS (100) substrates. For the structures with a single (2-4 nm thick) ferromagnetic EuS electron barrier we observe strongly non-linear I-V characteristics with an effective tunneling barrier height of 0.3-0.7 eV. The experimentally observed non-monotonic temperature dependence of the (normal to the plane of the structure) electrical resistance of these structures is discussed in terms of the electron tunneling mechanism taking into account the temperature dependent shift of the band offsets at the EuS-PbS heterointerface as well as the exchange splitting of the electronic states at the bottom of the conduction band of EuS.
Źródło:
Acta Physica Polonica A; 2003, 103, 6; 629-635
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving the periodicity measurement in fetal heart activity signal
Autorzy:
Roj, D.
Wróbel, J.
Horoba, K.
Przybyła, T.
Kupka, T.
Powiązania:
https://bibliotekanauki.pl/articles/332933.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
monitorowanie płodu
tętno płodu
USG metodą Dopplera
fetal monitoring
fetal heart rate
ultrasound Doppler
Opis:
In this paper we discussed the influence of preliminary processing of the ultrasound Doppler signal on accuracy of the fetal heart rate estimation as well as on reliability of the FHR instantaneous variability assessment. We attempted to develop an optimal processing channel of US Doppler signal in order to measure the periodicity of fetal heart activity with accuracy as close as possible to that ensured by FECG. The FHR values determined from the US signal were compared to the reference data obtained from direct FECG. In a final evaluation we used the parameters describing the FHR variability as the clinically important signal features being the most sensitive to any periodicity inaccuracy. The results proved that an application of proposed algorithms improves the accuracy of interval measurements and FHR instantaneous variability assessment in relation to the new-generation fetal monitors.
Źródło:
Journal of Medical Informatics & Technologies; 2010, 16; 19-26
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Segmentation of biomedical signals using an unsupervised approach
Autorzy:
Przybyła, T.
Wróbel, J.
Czabański, R.
Horoba, K.
Pander, T.
Momot, M.
Powiązania:
https://bibliotekanauki.pl/articles/333275.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
atraktor
przestrzeń jądra
grupowanie rozmyte
embedded space
attractor
PCA
kernel space
fuzzy clustering
Opis:
The paper presents an unsupervised approach to biomedical signal segmentation. The proposed segmentation process consists of several stages. In the first step, a state-space of the signal is reconstructed. In the next step, the dimension of the reconstructed state-space is reduced by projection into principal axes. The final step involves fuzzy clustering method. The clustering process is applied in the kernel-feature space. In the experimental part, the fetal heart rate (FHR) signal is used. The FHR baseline and the acceleration or deceleration patterns are the main signal nonstationarities but also the most clinically important signal features determined and interpreted in computer-aided analysis.
Źródło:
Journal of Medical Informatics & Technologies; 2012, 19; 125-131
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Temperature Processing of Nanostructures Based on II-VI Semiconductors Quantum Wells
Autorzy:
Majewicz, M.
Śnieżek, D.
Wojciechowski, T.
Baran, E.
Nowicki, P.
Wojtowicz, T.
Wróbel, J.
Powiązania:
https://bibliotekanauki.pl/articles/1376129.pdf
Data publikacji:
2014-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Ga
73.63.Hs
68.37.Hk
62.23.St
Opis:
We report the first results of electron beam lithography processes performed on polymethyl methacrylate (PMMA) and hydrogen silsesquioxane (HSQ) resists, which have been pre-backed in vacuum at T ≤ 90°C. For such low temperature processing the lithographical resolution is reduced as compared to standard procedures, however, the exposure contrast and adhesion to CdTe and HgTe substrates have been sufficient for the fabrication of sub-μ m quantum devices. Furthermore, the new method of electrical microcontact forming is proposed, based on the local melting and annealing of an indium metal layer, performed with the application of accelerated electron beam. The method has been tested for CdTe/CdMgTe quantum wells using the lithography techniques, the exposure parameters have been optimized by inspecting the morphology of annealed metal film via the in situ imaging.
Źródło:
Acta Physica Polonica A; 2014, 126, 5; 1174-1176
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 38

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