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Tytuł:
Magnetotransport Properties of $CaTi_xRu_{1-x}O_3$ (x=0, 0.07)
Autorzy:
Zorkovská, A.
Baran, A.
Feher, A.
Šebek, J.
Šantavá, E.
Bradarić, I.
Powiązania:
https://bibliotekanauki.pl/articles/1813683.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Pq
73.43.Qt
75.47.-m
Opis:
Electrical resistance, transversal magnetoresistance and the Hall effect were studied on polycrystalline $CaTi_xRu_{1-x}O_3$ (x=0, 0.07) samples using a conventional Quantum Design PPMS-9 equipment in the temperature range 2-300 K and magnetic field up to 9 T. Substantial differences were found between the two samples: (i) opposite to the metallic character of $CaRuO_3$, the substituted sample has insulating-like electrical resistance;(ii) the magnetoresistance of the substituted sample changes the sign from negative to positive values with increasing temperature. The magnetoresistance of $CaRuO_3$ is negative, the sign reversal is induced by magnetic field and only at temperatures below 15 K, such a behaviour is predicted for clustered systems;(iii) the Hall voltage in pure $CaRuO_3$ also changes sign from negative to positive values above 35 K. This temperature coincides with the observed magnetic transition temperature, indicating that the magnetic state and the carrier character interrelate.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 351-354
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pediatric cardiology emergencies – the role of Long QT Syndrome among arrhythmias
Autorzy:
Zipser, Mariusz
Zienciuk-Krajka, Agnieszka
Krenska, Dominika D.
Kwiatkowska, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/895795.pdf
Data publikacji:
2019-02-05
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
long QT syndrome
torsades de pointes
pediatric arrhythmias
Opis:
Long QT syndrome (LQTS) is a hereditary disease with significant mortality, which might be reduced with appropriate management. This cardiac disorder is regarded as rare, but its prevalence remains unknown. The clinical course of LQTS is variable and syncope is a common first manifestation of LQTS. Therefore in each patient after syncope an ECG should be carried out. However, there is no universal QT value applying to all patients (especially infants and children), because it varies depending on age and sex. Genetic testing can be of great importance for the management of families with LQTS and early identification of patient relatives at risk of developing disease. We aimed to show that a very important part of treatment is not only pharmacotherapy, especially beta-blockers, but change of lifestyle plays a significant role.
Źródło:
European Journal of Translational and Clinical Medicine; 2018, 1, 2; 4-10
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Magnetic Field on Resistive Transition of Thin Film Thallium Based Superconductors
Autorzy:
Woch, W. M.
Zalecki, R.
Kołodziejczyk, A.
Chmist, J.
Heiml, O.
Gritzner, G.
Powiązania:
https://bibliotekanauki.pl/articles/2041534.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.78.Bz
74.25.Qt
74.62.Yb
Opis:
The temperature and magnetic field dependences of a.c. resistance of c-axis oriented (Tl$\text{}_{0.5}$Pb$\text{}_{0.5}$)(Sr$\text{}_{0.8}$Ba$\text{}_{0.2}$)$\text{}_{2}$Ca $\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{x}$ and (Tl$\text{}_{0.6}$Pb$\text{}_{0.24}$Bi$\text{}_{0.16}$)(Sr$\text{}_{0.9}$Ba$\text{}_{0.1}$)$\text{}_{2}$Ca$\text{}_{2}$Cu$\text{}_{3}$ O$\text{}_{x}$ thin films as well as of (Tl$\text{}_{0.5}$Pb$\text{}_{0.5}$)(Sr$\text{}_{0.8}$Ba$\text{}_{0.2}$)$\text{}_{2}$Ca$\text{}_{ }$2Cu$\text{}_{3}$O$\text{}_{x}$ bulk sample from 77 K to room temperature and in magnetic fields from zero to 3000 Oe were measured and analyzed. The magnetic field and temperature dependence of the resistive superconducting transition and irreversibility field were discussed both in the flux-creep model and in the superconducting liquid vortex state model. The temperature width of resistive transition was explained taking advantage of the Ambegaokar and Halperin model of the resistance of superconducting Josephson weak links and barrier of vortex motion presented by Tinkham. The irreversibility field was described by an exponential formula.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 785-791
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetoresistance and Intrinsic Pinning of Vortices in the Untwinned $YBa_2Cu_3O_{7 - δ}$ Single Crystals with Optimal Oxygen Content and a Small Deviation from the Oxygen Stoichiometry
Autorzy:
Vovk, R.
Gvozdikov, V.
Obolenskii, M.
Nazyrov, Z.
Kruglyak, V.
Powiązania:
https://bibliotekanauki.pl/articles/1427580.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Fy
74.25.Qt
Opis:
We study the temperature dependence of the in-plane magnetoresistance $ρ_{ab}(T)$ in untwinned $YBa_2Cu_3O_{7 - δ}$ single crystals with the optimal oxygen content and with a small deficit of oxygen atoms at different angles between the external magnetic field 15 kOe and the ab-planes α. We found that at high temperatures in the pseudogap region external magnetic field does not affect the $ρ_{ab}(T)$ but it broadens transitional region $T_{c} - T_{c0}$ from 0.3 K at zero field and α = 0 to approximately 6 K at α = 60° in the field. In case of optimal doping the function $ρ_{ab}(T)$ display a 3D to 2D dimensional crossover when temperature decreases from $T_{c}$ to $T_{c0}$ and scaling near the $T_{c0}$ which we relate to the flux-flow and vortex-lattice melting. In the underdoped sample the vortices are effectively pinned by the random oxygen vacancies and the function $ρ_{ab}(T)$ in transitional region has smooth tails without any traces of crossover and scaling.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1191-1194
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth and Investigation of Heterostructures Based on Multiferroic $BiFeO_3$
Autorzy:
Vengalis, B.
Devenson, J.
Oginskis, A.
Butkutė, R.
Maneikis, A.
Steikūnienė, A.
Dapkus, L.
Banys, J.
Kinka, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813484.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.30.+h
73.43.Qt
75.47.Lx
Opis:
We report heteroepitaxial growth of multiferroic $BiFeO_3$ thin films by RF magnetron sputtering on lattice-matched $SrTiO_3$ substrates, as well as preparation and electrical properties of the heterostructures formed by growing $BiFeO_3$ thin films on highly conductive $LaNiO_3$ films and n-Si substrates. Nonlinear and rectifying current-voltage (I-U) characteristics were revealed for the heterojunctions in a wide temperature range (T=78-300 K).
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 1095-1098
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital audio broadcasting
Autorzy:
van Katjing, Jan
Powiązania:
https://bibliotekanauki.pl/articles/1954573.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska
Tematy:
DAB
C++
software defined radio
DAB+
Qt
radio programowane
Opis:
Processing digital radio - either on the transmitter or the receiver side - requires a significant amount of digital processing. A receiver for digital radio usually consists of two parts, a ”hardware” part, handling the conversion from an analog antenna signal to a stream samples, and a ”software part”, a decoder, decoding the samples and generating audio, text, images and video. In this paper some aspects of the design and implementation of Qt-DAB, a software decoder for Digital Audio Broadcasting (DAB and DAB+), is discussed. The Qt-DAB decoder runs on a variety of hardware platforms, hardware as small as creditcard sized computers as the Raspberry PI 2, and home computers. In the design performance and flexibility were key. The design is such that it is easy to interface to different hardware SDR devices and easy to add new features. While the core of the Qt-DAB software is formed by the signal processing part, interpreting the incoming sample stream and generating audio, text and images, by far the largest part of the software is handling user interaction and user comfort. Qt-DAB provides a large amount of options, options to select a device, to inspect the signal, to store signals, and options to set the configuration. All in all, it shows that about three quarters of the amount of code is involved is the non-signal processing part.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2021, 25, 3; 315-328
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kondo Screening Effect and Ferromagnetic Order in $UCu_2Si_2$
Autorzy:
Troć, R.
Samsel-Czekała, M.
Coqblin, B.
Powiązania:
https://bibliotekanauki.pl/articles/1426710.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.43.Qt
75.30.Mb
75.30.Fv
71.18.+y
Opis:
Electrical resistivity and low temperature magnetoresistivity measurements made on a single crystal of $UCu_2Si_2$ are reported. By using as a phonon reference the temperature dependence of the electrical resistivity of $ThCu_2Si_2$ we could establish that $UCu_2Si_2$ has both a ferromagnetic and a Kondo behaviour. Such a phenomenon can be described by the underscreened Kondo lattice model. The magnetoresistivity revealed the presence of magnetic fluctuations within the ferromagnetic order as it was reported previously for $UGe_2$. Also one of the calculated Fermi surface sheets exhibits nesting properties, being in perfect agreement with the previous neutron diffraction data, supporting the possibility of a presence of the spin density wave phase. In this ternary silicide, where the strong ferromagnetic behaviour exists, this phase is signalised by magnetic fluctuations.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1023-1025
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Exponential Decays in First-Order Kinetic Processes. The Case of"Squeezed Exponential"
Autorzy:
Sworakowski, J.
Matczyszyn, K.
Powiązania:
https://bibliotekanauki.pl/articles/1813990.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.20.Pm
82.30.Qt
Opis:
Kinetics of processes, in which the reaction rate increases with conversion, is discussed and illustrated with an example of the chemical reaction of isomerization of an azobenzene derivative in a liquid crystalline matrix. A simple phenomenological model is put forward explaining the effect by dynamic changes of interactions between the reacting species and the matrix.
Źródło:
Acta Physica Polonica A; 2007, 112, S; S-153-S-159
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phonon-Assisted Kondo Resonance in Spin-Dependent Transport through a Quantum Dot
Autorzy:
Świrkowicz, R.
Wilczyński, M.
Barnaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/1810522.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.Hk
73.63.Kv
73.43.Qt
72.25.-b
Opis:
Effects of local vibrational modes on electron transport through a quantum dot attached to ferromagnetic electrodes are studied in the Kondo regime by the non-equilibrium Green function formalism based on the equation of motion method. Differential conductance is calculated for parallel and antiparallel configurations of the leads' magnetic moments, and well defined Kondo resonance peaks and their phonon satellites are found. The influence of a compensating magnetic field on the peak positions is also discussed.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 272-274
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approximation of Electrical and Magneto Transport Properties of LSMO Thin Films
Autorzy:
Štrbík, V.
Reiffers, M.
Chromik, Š.
Španková, M.
Powiązania:
https://bibliotekanauki.pl/articles/1368199.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.43.Qt
75.47.-m
75.70.-i
Opis:
We have used a three term polynomial expression to approximate electrical and magneto transport properties of epitaxial $La_{0.67}Sr_{0.33}MnO_{3}$ (LSMO) thin films in wide temperature range (2-350 K) and in magnetic field up to 9 T. The first term is determined by a low temperature (T<20 K) residual resistivity $ρ_{0}$ and this term is magnetic field independent. The second term describes the electron-electron scattering in LSMO, it shows ~ $T^{2}$ dependence of resistivity up to temperature about 160 K and depends only weakly on magnetic field. The third term, proportional to ~ $T^{4.5}$ dependence, describes a significant increase of resistivity in temperature range 160-350 K and due to its sensitivity to applied magnetic field it is possible to approximate temperature dependence of magnetorestivity below 350 K.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 210-211
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Electromagnetic Phenomena in HTc Superconductors
Autorzy:
Sosnowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1812341.pdf
Data publikacji:
2008-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Qt
74.25.Sv
Opis:
Unique electromagnetic properties, especially concerning recent observations of the giant remanent magnetic moment in HTc superconductors, require new approach to modeling these phenomena in the oxide ceramics. The present paper is devoted to the analysis of the influence of flux pinning on critical current and flux trapping in HTc superconductors. Modeling of the interaction between nanosized pinning centers and pancake vortices is presented, allowing to determine critical current density, taking into account elasticity forces of the vortices lattice. Ceramic structure of oxide superconductors was considered in trapped flux analysis. The mechanism of trapped flux generation was regarded as strongly related to vortex pinning and critical current phenomena.
Źródło:
Acta Physica Polonica A; 2008, 114, 1; 269-274
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of the Pinning Centres Dimensions on the Critical Current in High-T$\text{}_{c}$ Superconductors
Autorzy:
Sosnowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2041525.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Qt
74.72.-h
Opis:
An analysis of the influence of the pinning centres dimensions on the critical current and pinning forces of the high temperature oxide superconductors is presented. Individual interaction of the pinning centres with pancake type vortices is considered for the layered structure of the copper-oxide superconductors. The phenomenological model was elaborated in which the change of the system energy has been constructed taking into account the pinning interaction, Lorentz forces, and elastic energy of the vortex lattice. The resistivity criterion has been used for detection of the critical current. Especially important results have been obtained for the range of the pinning centres dimensions smaller than twice the value of the coherence length.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 767-770
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetoresistance Anisotropy and Magnetic H-T Phase Diagram of $Tm_{0.996}Yb_{0.004}B_{12}$
Autorzy:
Sluchanko, N.
Azarevich, A.
Bogach, A.
Glushkov, V.
Demishev, S.
Gavrilkin, S.
Gabani, S.
Flachbart, K.
Shitsevalova, N.
Filipov, V.
Vanacken, J.
Moshchalkov, V.
Stankiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1371466.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Gd
73.43.Qt
75.30.Kz
75.20.Hr
75.50.Ee
Opis:
The antiferromagnetic ground state has been studied by transverse magnetoresistance, heat capacity and magnetization measurements, which were carried out on high quality single crystals of $Tm_{0.996}Yb_{0.004}B_{12}$ dodecaboride in strong magnetic fields at liquid helium temperatures. Both antiferromagnetic-paramagnetic (AF-P) and spin-orientation (AF1-AF2) phase transitions have been observed, and allowed to construct a complicated magnetic H-T phase diagram for this compound. Strong magnetoresistance anisotropy was found both in AF states (ρ(H||[110])/ρ(H||[111])~ 1.2 at H~ 20 kOe) and at the critical field of AF-P transition $(H_{N}[100]$/$H_{N}[111]$~ 1.25) in this magnetic metal with a simple fcc crystal structure.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 332-333
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron-Electron Interaction Effects in Quantum Hall Regime of GaN/AlGaN Heterostructures
Autorzy:
Siekacz, M.
Dybko, K.
Maude, D.
Potemski, M.
Knap, W.
Skierbiszewski, C.
Powiązania:
https://bibliotekanauki.pl/articles/2047676.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.30.+h
73.40.-c
73.43.Qt
Opis:
We measured the activation of resistivity at quantum Hall minima in high mobility two-dimensional electron gas confined at AlGaN/GaN interface. The effective g-factor and effective mass was deduced. The electron-electron interactions modify both quantities compared to their bare band values. It is found that the influence of interactions is much more pronounced onto g-factor than effective mass. The relative spin susceptibility was also calculated and compared with available theories. The best agreement was found with the ideal two-dimensional gas model in random phase approximation.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 269-273
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
QT prolongation due to targeted anticancer therapy
Autorzy:
Setteyova, Lucia
Bacharova, Ljuba
Mladosievicova, Beata
Powiązania:
https://bibliotekanauki.pl/articles/1064835.pdf
Data publikacji:
2016
Wydawca:
Medical Education
Tematy:
QT prolongation
cancer patients
targeted therapy
torsade de pointes
Opis:
A growing number of targeted anticancer agents has shown the unexpected ability to induce QT interval prolongation. In addition, standard chemotherapeutics and a variety of conditions such as electrolyte abnormalities, endocrine disorders, cardiac diseases, nutritional disturbances and other factors may be associated with long QT syndrome in cancer patients. Prolongation of the QT interval can lead to life-threatening ventricular arrhythmias, including ‘torsade de pointes’ (TdP). The association between long QT interval and ventricular arrhythmias remains the subject of many controversies. The QT interval represents the time interval of both ventricular depolarization and repolarization. Not only abnormalities of ion channels, but also changes in the myocardial microarchitecture and other factors and disorders frequently seen in cancer patients may participate in its prolongation and potential risk of ventricular arrhythmias. The aim of this review was to summarize current knowledge about QT prolongation in cancer patients with the special focus on targeted therapy.
Źródło:
OncoReview; 2016, 6, 3; A103-112
2450-6125
Pojawia się w:
OncoReview
Dostawca treści:
Biblioteka Nauki
Artykuł

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