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Tytuł:
Ocena profilu lipidowego u pacjentów aglomeracji łódzkiej leczonych statynami
Lipid profile evaluation in Lodz agglomeration patients treated with statins
Autorzy:
Porembińska, Dominika
Paradowski, Marek
Olszowiec, Kamila
Wlazeł, Rafał Nikodem
Powiązania:
https://bibliotekanauki.pl/articles/1032538.pdf
Data publikacji:
2014
Wydawca:
Łódzkie Towarzystwo Naukowe
Tematy:
HDL-Ch
LDL-Ch
blood lipid profile
statins
total cholesterol
triglycerides
profil lipidowy
statyny
cholesterol całkowity
ldl-ch
hdl-ch
triglicerydy
Opis:
Introduction: In more than the half of the population in Europe, including Poland, blood lipid profile is abnormal. These abnormalities are: high total cholesterol (TCh) levels (> 5.0 mmol/L or 190 mg/dL), often accompanied by the increased concentrations of cholesterol (Ch) in the atherogenic LDL (LDL-Ch) and theelevated levels of triglycerides (TG). In some people we also observe thedecrease in the concentration of Ch in antyatherogenic HDL (HDL-Ch, so-called "good cholesterol"). Such abnormalities lead to the progression of atherosclerosis and, consequently, to the increase in the occurrence of cardiovascular diseases (CVD) which are the leading causes of death worldwide. In maintaining proper blood lipid profile a lipid-lowering therapy with the use of statins is recommended, in addition to maintaining a proper diet and increased physical activity. The aim of this study was to compare the lipid profile (TCh, LDL-Ch, HDL-Ch and TG) in two groups of patients of Lodz population: in a group of patients receiving statins vs a group of patients without corresponding treatment. This will also allow to evaluate the impact of statins on improving the lipid profile in subjects. Material and methods: The study involved 91 patients (57 women and 34 men, at the age from 36 to 81 years, mean 62 years) of Primary Health Care of the Military Teaching Hospital of Lodz - Central Veterans Hospital. We created 2 groups: group A (n=52, 35 women and 17 men) taking regularly statins and control group K (n=39, 22 women and 17 men). In all the patients the basic parameters of the lipid profile were assessed: TCh, HDL-Ch, LDL-Ch and TG. Results: There was a statistically relevant lower level of TCh in the whole group A in comparison to group K (4.70 vs. 5.88 mmol/L with a recommended level of < 5.0 mmol/L) and the LDL-Ch (2.97 vs 4.14 mmol/L with a recommended level of < 3.0 mmol/L). We found that in group A the recommended values for all 4 lipid profile parameters were present in 17 of 52 patients (32.7%), while in group K only in 2 of 39 patients (5.1%). Conclusion: Lipid profile (TCh, LDL-Ch, HDL-Ch and TG) in patients undergoing treatment with statins is significantly closer to the recommended values comparing to untreated patients. This applies particularly to significantly lower levels of TCh and LDL-Ch in patients that undergo treatment. The results confirm the previous data that a proper lipid-lowering therapy significantly effects in the reduction of the risk of cardiovascular disease by adequate maintenance of lipid profile.
Wstęp: U ponad połowy populacji europejskiej, w tym także polskiej, zaburzona jest gospodarka lipidowa ustroju. Zaburzenia te występują pod postacią podwyższonego stężenia cholesterolu całkowitego (TCh) we krwi (> 5 mmol/L lub 190 mg/dL) z towarzyszącymi często zwiększonymi stężeniami cholesterolu (Ch) w miażdżycorodnej frakcji LDL (LDL-Ch) oraz triglicerydów (TG). U części osób występuje również obniżenie stężenia Ch w antymiażdżycorodnej frakcji HDL (HDL-Ch, tzw. „dobry cholesterol”). Takie zaburzenia prowadzą do wzmożonego rozwoju miażdżycy i w konsekwencji do wzrostu częstości występowania chorób sercowo-naczyniowych (ChSN), które są główną przyczyną zgonów na świecie. W celu utrzymywania należytego profilu lipidowego krwi zaleca się, poza stosowaniem odpowiedniej diety i zwiększonej aktywności fizycznej, leczenie hipolipemizujące z użyciem leków z grupy statyn. Celem niniejszej pracy była ocena porównawcza profilu lipidowego (TCh, LDL-Ch, HDL-Ch i TG) w dwóch grupach pacjentów populacji łódzkiej: w grupie nieleczonych i w grupie przyjmujących statyny oraz ustalenie czy stosowanie statyn wpływa na poprawę profilu lipidowego. Materiał i metody: Badaniom poddano 91 pacjentów (57 kobiet i 34 mężczyzn w wieku od 36 do 81 lat, średnia 62 lata) Podstawowej Opieki Zdrowotnej Uniwersyteckiego Szpitala Klinicznego im. Wojskowej Akademii Medycznej – Centralnego Szpitala Weteranów w Łodzi. Utworzono 2 grupy: grupa badana A (n=52, w tym 35 kobiet i 17 mężczyzn) osoby przyjmujące regularnie lek z grupy statyn oraz grupa porównawcza K (n=39, w tym 22 kobiet i 17 mężczyzn) obejmująca pacjentów nieleczonych statynami. U wszystkich badanych oznaczono podstawowe parametry profilu lipidowego: TCh, HDL-Ch, LDL-Ch oraz TG. Wyniki: Wykazano znamienne niższe wartości stężeń w całej grupie A w porównaniu do całej grupy K dla TCh (4,70 vs 5,88 mmol/L przy stężeniu zalecanym < 5,0 mmol/L) i dla LDL-Ch (2,97 vs 4,14 mmol/L przy stężeniu zalecanym < 3,0 mmol/L). Stwierdzono, że u osób leczonych statynami (gr. A) wartości zalecane dla wszystkich 4 parametrów profilu lipidowego występują u 17 z 52 badanych (32,7%), zaś u ludzi niestosujących statyn tylko u 2 z 39 badanych (5,1%). Wnioski: Profil lipidowy (TCh, LDL-Ch, HDL-Ch i TG) u ludzi poddanych leczeniu statynami jest bardziej zbliżony do wartości zalecanych niż u osób nieleczonych. Dotyczy to szczególnie, w sposób znamienny statystycznie, niższych stężeń TCh i LDL-Ch występujących u osób leczonych. Wyniki badań potwierdzają wcześniejsze dane, że stosowanie terapii lekami hipolipemizującmi istotnie zmniejsza ryzyko wystąpienia chorób sercowo-naczyniowych przez utrzymanie prawidłowego profilu lipidowego.
Źródło:
Folia Medica Lodziensia; 2014, 41, 1; 47-63
0071-6731
Pojawia się w:
Folia Medica Lodziensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Orbit Coupling for f-Electrons in a Crystalline Field
Autorzy:
Lulek, T.
Powiązania:
https://bibliotekanauki.pl/articles/1929779.pdf
Data publikacji:
1993-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ch
Opis:
The notion of a spin-orbit interaction arises from consideration of dynamics of multielectron atoms, i.e. systems of N electrons in a spherical potential. This notion is essentially a single-particle one. We sketch its origin as a second-order correction when Dirac four-component wave equations for an electron in external electromagnetic fields are simplified to the two-component Pauli spinors. The constraints in spinorial degrees of freedom consist, roughly speaking, in neglecting the small component of the electron four-function. The spin-orbit interaction term serves to compensate effects of the small component. The crystalline field induces some deviations from spherical symmetry of an isolated atom, which yields some modifications of the spherical form of the spin-orbit interaction operator. These modifications can be described in terms of a number of tensor operators adapted to appropriate chains of subgroups of the spherical symmetry group. We present a classification of independent tensor operators and discuss the relevant parameters for f-ions.
Źródło:
Acta Physica Polonica A; 1993, 84, 5; 867-873
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rationalization of Spectra of Rare Earths in Condensed Matter
Autorzy:
Reisfeld, R.
Jørgensen, C. K.
Powiązania:
https://bibliotekanauki.pl/articles/1929810.pdf
Data publikacji:
1993-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ch
Opis:
The parametrized models are compared with counter-intuitive consequences of the non-relativistic Schrödinger treatment. For both 4f$\text{}^{ q}$, 5f$\text{}^{ q}$ and d$\text{}^{9}$ systems in condensed matter, the energy levels must be strongly influenced by correlation effects. The parametrization of intensities is conceptually very different for f$\text{}^{ q}$ and d$\text{}^{9}$ compounds. The bandwidths of absorption and luminescence are discussed and related to the Born-Oppenheimer factorization.
Źródło:
Acta Physica Polonica A; 1993, 84, 5; 1011-1019
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetocrystalline Anisotropy of Tb$\text{}_{1.1}$(FeCo)$\text{}_{11}$Ti
Autorzy:
Ivanova, T. I.
Pankratov, N. Yu.
Pastushenkov, Yu. G.
Skokov, K. P.
Powiązania:
https://bibliotekanauki.pl/articles/2013699.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
Opis:
The Tb$\text{}_{1.1}$Fe$\text{}_{11-x}$Co$\text{}_{x}$Ti (x = 0, 1, 2, 3, 4) compounds with the ThMn$\text{}_{12}$-type structure were studied by using the torque and magnetization measurements in order to investigate temperature and composition behavior of the magnetocrystalline anisotropy. The Tb$\text{}_{1.1}$(FeCo)$\text{}_{11}$Ti single crystals demonstrated spin reorientation transition from easy axis to easy plane with the decrease in temperature. The substitution of Co for Fe produces an enhancement of the Curie temperatures, decreases temperatures of spin reorientation transition and appearance of canted structure.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 847-850
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex Dielectric Coefficient of Breast Phantom Prepared for Breast Cancer Detection
Autorzy:
Sayinti, A.
Açikalin, E.
Çoban, K.
Vertii, A.
Powiązania:
https://bibliotekanauki.pl/articles/1400036.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.Ch
Opis:
Microwave measurement techniques attract attention due to its practical solutions in breast cancer imaging. Early detection of cancer is the purpose of these imaging studies. For these imaging processes, phantoms which reflect the properties of the area to be imaged are produced. The produced homogeneous phantoms are imaged by stepper frequency of radar technology, as the narrow bands are used for heterogeneous mixtures. Phantoms are used since 70's until today. Different methods are experimented for producing phantoms of tissue, muscle, fat, skin, etc. Iron powder, polymer materials, various oils and gelatins used today are the materials used for producing the phantoms. In this study, phantom breast imaging is aimed. Phantoms breast and breast tumor samples are created. For phantoms and tumor samples, reflection and transmittion measurements are done with Network Analyzer in X-Band (8.2-12.4 GHz). Complex permittivity is calculated with Agilent 85071 Material Measurement Software-Fast Method (NIST-iterative method). It was considered breast phantom with tumor model for 3D imagine at 2-3.5 GHz frequency range.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 464-466
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Properties of Triglycine Sulphate Crystals Admixtured with L-Threonine
Autorzy:
Czarnecka, A.
Stankowska, J.
Mielcarek, S.
Powiązania:
https://bibliotekanauki.pl/articles/1931325.pdf
Data publikacji:
1994-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.Ch
Opis:
The influence of L-threonine admixture on the dielectric properties of triglycine sulphate (TGS) crystals was studied. With increasing concentration of the admixture in the solution from which the crystals were grown, their maximum permittivity and spontaneous polarization were found to decrease, their Curie point was found not much different than that for pure TGS crystals (322 K), the coercive field and bias field increased. The domain structure of the obtained crystals was also studied by the liquid crystal method.
Źródło:
Acta Physica Polonica A; 1994, 85, 5; 849-858
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Dependence of Dielectric Properties of D-Serine Admixtured TGS Crystals on the Distance from the Seed of the Crystal Growth
Autorzy:
Stankowska, J.
Czarnecka, A.
Dongo Gemi, Bangobango
Powiązania:
https://bibliotekanauki.pl/articles/1929193.pdf
Data publikacji:
1993-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.Ch
Opis:
Dielectric properties of a D-serine admixtured triglycine sulphate (TGS) crystal were studied on samples cut out from different sites in the crystal. The value of spontaneous polarization P$\text{}_{s}$ measured on b-cuts was found to be independent of the site. Whereas the coercive field E$\text{}_{c}$ values were higher for the samples cut out closer to the seed than for those cut out at the ends of the crystal along b axis. After rejuvenation the values of the bias field E$\text{}_{b}$ increased in contrary to the effect observed in the pure TGS crystals. An exponentially decreasing dependence of the maximum permittivity ε$\text{}_{max}$ on the site of the samples (b-plates) cut out along b axis from -b to +b positions, was obtained.
Źródło:
Acta Physica Polonica A; 1993, 83, 4; 485-494
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametrization of the Bilinear Orbit—Lattice Interaction
Autorzy:
Pastusiak, W.
Powiązania:
https://bibliotekanauki.pl/articles/1888013.pdf
Data publikacji:
1991-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ch
Opis:
A group theoretical parametrization scheme of the bilinear orbit-lattice interaction is presented. Using this scheme a general analytical form of this interaction in the point-charge electrostatic model has been obtained. Based on this general analytical form the second-order parameters of the bilinear orbit-lattice interaction have been calculated for a tetrahedral complex. For cubic complexes a microscopic interpretation of the G-tensor components in the long-wavelength approximation of acoustic waves is given for the first time. The presented scheme of parametrization as well as the method of calculations of the interaction parameters may be extended to other models of the crystal field.
Źródło:
Acta Physica Polonica A; 1991, 80, 1; 107-116
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Postulat more geometrico w filozofii matematyki Charlesa S. Peirce’a
Autorzy:
Michalczyk, Hanna
Powiązania:
https://bibliotekanauki.pl/articles/669413.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Papieski Jana Pawła II w Krakowie
Tematy:
Ch. S. Peirce
Ch. S. Peirce’s philosophy of mathematics
semiotics
methodeutic
more geometrico
filozofia matematyki Ch. S. Peirce’a
semiotyka
metodeutyka
Opis:
The paper gives a general characteristic of the philosophy of mathematics of Charles S. Peirce (1839–1914), with particular attention to the relation between mathematics and methodeutic. This relationship is specially interesting in the light of Peirce’s philosophy of science, which says that methodeutic is a normative science, one of the branches of logic (semiotics) and it defines the rules of scientific research, that also mathematics should complies with. On the other hand, according to the formal construct proposed by Peirce and apply in the “realm of science“ – mathematics (“the Queen of the Sciences”) is the first among all scientific disciplines therefore it precedes methodeutic. While studying the relationship between mathematics and methodeutic, emerges an interesting reinterpretation of a methodological postulate of Rene Descartes, who proclaiming the necessity of doing the philosophy according to the mathematical methods; the only ones, as Descartes was convinced, that make it possible to achieve a real (“clear and distinct”) knowledge. He expressed this principle briefly, in the famous: more geometrico. Following the twists and turns of mathematics – methodeutic compound we can easily find how Peirce – essentially a critic of Cartesianism – modernized the scientific (methodological) rule of Descartes.
W tekście przedstawiona została ogólna charakterystyka filozofii matematyki Charlesa S. Peirce’a (1839–1914), ze szczególnym uwzględnieniem relacji między matematyką a metodeutyką (metodologią). Związek ten jest o tyle interesujący, że w świetle filozofii nauki Peirce’a metodeutyka jest nauką normatywną, jedną z gałęzi logiki (semiotyki), wskazującą reguły prowadzenia badań naukowych, którym matematyka winna czynić zadość. Z kolei, zważywszy na formalne rozwiązania proponowane przez Peirce’a, a obowiązujące w „królestwie nauk” – matematyka poprzedza metodeutykę, jest pierwszą wśród dyscyplin poznawczych. Na tle relacji, która łączy matematykę i metodeutykę, wyłania się interesująca reinterpretacja metodologicznego postulatu René Descartesa, głoszącego konieczność uprawiania filozofii metodami matematycznymi, pozwalającymi na osiągnięcie wiedzy ścisłej i pewnej, a wyrażonego krótko w słynnym more geometrico. Śledząc meandry matematyczno-metodeutycznego związku, można wyczytać, jak Peirce – zasadniczo krytyk kartezjanizmu – uwspółcześnił naukową wskazówkę Kartezjusza.
Źródło:
Tarnowskie Studia Teologiczne; 2016, 35, 1
2391-6826
0239-4472
Pojawia się w:
Tarnowskie Studia Teologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure of Organometallic Complexes of f Elements. Are Molecular Orbital Calculations a Useful Tool for Spectroscopists?
Autorzy:
Jank, S.
Amberger, H.-D.
Powiązania:
https://bibliotekanauki.pl/articles/1945458.pdf
Data publikacji:
1996-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Sq
71.70.Ch
Opis:
The crystal field parameters of base-free (Me$\text{}_{3}$SiC$\text{}_{5}$H$\text{}_{4}$)$\text{}_{3}$Pr, (C$\text{}_{5}$H$\text{}_{5}$)$\text{}_{3}$Pr·NCCH$\text{}_{3}$, (C$\text{}_{5}$H$\text{}_{5}$)$\text{}_{3}$La(NCCH$\text{}_{3}$)$\text{}_{2}$:Pr, [Pr(C$\text{}_{8}$H$\text{}_{8}$)]$\text{}^{+}$ and Nd[N(SiMe$\text{}_{3}$)$\text{}_{2}$]$\text{}_{3}$ as model compound for Nd[CH(SiMe$\text{}_{3}$)$\text{}_{2}$]$\text{}_{3}$ were inserted into the corresponding energy matrices of a model spin-free f$\text{}^{1}$ system. Diagonalizing these matrices the crystal field splitting patterns of the f orbitals were calculated. These experimentally based molecular orbital schemes are compared with the results of previous model calculations.
Źródło:
Acta Physica Polonica A; 1996, 90, 1; 21-32
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Investigation by Scanning Tunnelling Microscopy in Liquid Medium
Autorzy:
Phaner, M.
Robach, Y.
de Villeneuve, C.
Wojczuk, S.
Olejniczak, W.
Porte, L.
Powiązania:
https://bibliotekanauki.pl/articles/1929313.pdf
Data publikacji:
1993-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
73.40.Gk
Opis:
Scanning tunneling microscopy in liquid environment has gained an increased interest in recent years. The specific features of the in situ observation of surface structures at the solid/liquid interface are first presented. Next, a high resolution imaging of high oriented pyrolytic graphite (HOPG) graphite surface shows the potentiality of our home-made microscope. The last study, performed on technological InP. substrates, illustrates the extensive applications of in situ imaging in the fields of semiconductor technology.
Źródło:
Acta Physica Polonica A; 1993, 83, 5; 611-619
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oxidation Studies of the Graphite Surface by Scanning Tunneling Microscopy and Photoelectron Spectroscopy
Autorzy:
Klusek, Z.
Phaner, M.
Krapf, P.
Porte, L.
Powiązania:
https://bibliotekanauki.pl/articles/1931811.pdf
Data publikacji:
1994-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
33.60.Fy
Opis:
Scanning tunneling microscopy and spectroscopy and X-ray photoelectron spectroscopy were used to study oxidation effects of nitric acid on highly oriented pyrolytic graphite surface. This treatment was performed at different temperatures and etching times with the aim of realizing local binding sites on the surface without creating deep defects. Then these three technics were found in good agreement to characterize the weakly oxidized surface. A wavy structure different from pure graphite at atomic scale was imaged by scanning tunneling microscopy. This modification was correlated to the presence of carboxylic groups on the surface revealed by X-ray photoelectron spectroscopy. Both spectroscopies of scanning tunneling and X-ray photoelectron demonstrated the vanishing of π bands characteristic from sp$\text{}^{2}$ graphitic hybridization. This was attributed to dehybridization corresponding to new bondings of the graphite carbons in the carboxylic groups.
Źródło:
Acta Physica Polonica A; 1994, 86, 6; 947-954
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Resonance and Dielectric Studies of a Nonlinear La$\text{}_{3}$Ga$\text{}_{5.5}$Ta$\text{}_{0.5}$O$\text{}_{14}$ Single Crystal Doped with Erbium
Autorzy:
Bodziony, T.
Typek, J.
Orlowski, M.
Majszczyk, J.
Wabia, M.
Berkowski, M.
Ryba-Romanowski, W.
Guskos, N.
Likodimos, V.
Anagnostakis, E. A.
Powiązania:
https://bibliotekanauki.pl/articles/2035732.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
77.22.Ch
Opis:
Single crystal of erbium doped La$\text{}_{3}$Ga$\text{}_{5.5}$Ta$\text{}_{0.5}$O$\text{}_{14}$ grown by the Czochralski method have been investigated by electron paramagnetic resonance and dielectric spectroscopy methods. Dielectric permittivity ε measurements performed in 90-440 K temperature range have shown negligible dispersion for 1 kHz - 1 MHz frequencies and a Curie-Weiss type behaviour with C=47700 K andθ=-340 K. Electron paramagnetic resonance studies have revealed the presence of two different paramagnetic, monoclinic centres. The calculated g factor values are: g$\text{}_{1}$=1.449, g$\text{}_{2}$=11. 534, g$\text{}_{3}$=4.24 for the main M$\text{}_{1}$ centre and g$\text{}_{1}$=1.98, g$\text{}_{2}$=4.169, g$\text{}_{3}$=4.25 for the weaker M$\text{}_{2}$ centre. The temperature dependence of EPR line intensity for centre M$\text{}_{1}$ and M$\text{}_{2}$ is quite different - while lines attributed to M$\text{}_{1}$ could only be observed at low temperatures, below 20 K, lines of M$\text{}_{2}$ centre persisted up to 200 K. The M$\text{}_{1}$ centre is connected with Er$\text{}^{3+}$ ion entering substitutionally into La$\text{}^{3+}$ site, while M$\text{}_{2}$ is probably connected with 3d ions at the same site, unintentionally introduced into the material as an admixture.
Źródło:
Acta Physica Polonica A; 2003, 103, 2-3; 315-322
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of the Surface Energy for the Formation of the Domain Structure at Magnetoelastic Phase Transition
Autorzy:
Gomonaj, H. V.
Loktev, V. M.
Powiązania:
https://bibliotekanauki.pl/articles/2013067.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ee
75.60.Ch
Opis:
The formation of the domain structure during magnetic ordering in the pure antiferromagnet with the rotational (non-180°) domains can be treated as thermodynamically preferable if the free energy of the sample is minimized with the account of surface energy. The analogy between the role of magnetostatic energy in ferromagnets and surface energy of antiferromagnet is traced. The behavior of the domain structure and macroscopic strain tensor in the external magnetic field is investigated.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 459-462
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Temperature Magnetic Ordering in NdAgAl₃
Autorzy:
Nallamuthu, S.
Džubinská, A.
Reiffers, M.
Nagalakshmi, R.
Powiązania:
https://bibliotekanauki.pl/articles/1032835.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ch
65.40.Ba
Opis:
We present the detailed study of magnetic, thermodynamic, and transport properties of polycrystalline NdAgAl₃. The compound crystallizes in BaNiSn₃-type tetragonal structure with the space group I4mm. Magnetic, heat capacity and transport measurements indicate the possible antiferromagnetic nature of the ordering below 2 K. The compound shows the Schottky anomaly in heat capacity data. Magnetoresistance is negative at low temperature.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1015-1017
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Axial Dimension of Static Head-to-Head Domain Boundary in Amorphous Glass-Coated Microwire
Autorzy:
Kladivová, M.
Ziman, J.
Kecer, J.
Duranka, P.
Powiązania:
https://bibliotekanauki.pl/articles/1030252.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Ch
Opis:
A new experiment allowing the study of static domain boundary dimensions in bistable microwire is proposed. In this experiment a static domain boundary is created by an inhomogeneous axial magnetic field. The changes in axial magnetic flux due to the presence of this boundary were measured along the microwire using two pick-up coils. Experimental results were compared with a simple theoretical model. For Fe_{77.5}Si_{7.5}B_{15} microwire with total diameter of 30 μm and metal nucleus diameter of 15 μm, good agreement between theoretical and experimental data was obtained for an axial dimension of the static domain boundary about 200 times larger than the diameter of the wire metallic core.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 639-641
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Theoretical Analysis of Zero Field Splitting of $Mn^{2+}$ in Ammonium Oxalate Monohydrate
Autorzy:
Kripal, R.
Pandey, S.
Powiązania:
https://bibliotekanauki.pl/articles/1535738.pdf
Data publikacji:
2010-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ch
76.30.Fc
Opis:
The superposition model has been used to investigate the substitution of $Mn^{2+}$ in ammonium oxalate monohydrate. The zero field splitting parameters D and E calculated by the superposition model are compared with the experimental values $D_{exp}$ and $E_{exp}$, respectively, for $Mn^{2+}$ obtained by electron paramagnetic resonance. Both the zero field splitting parameters D and E calculated theoretically are in good agreement with the experimental values $D_{exp}$ and $E_{exp}$. The result indicates that the $Mn^{2+}$ ion substitutes for the $NH_4^{+}$ ion in ammonium oxalate monohydrate.
Źródło:
Acta Physica Polonica A; 2010, 118, 4; 629-632
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Current-Induced Spin Accumulation and Spin Transfer Torque in a Néel Domain Wall
Autorzy:
Baláž, P.
Szymczyk, Ł.
Dugaev, V.
Barnaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/1427608.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.70.Cn
Opis:
Current-induced spin accumulation in a domain wall and the associated spin torque exerted on the wall are analyzed theoretically. The considerations are limited to a relatively thick Néel domain wall in a bulk ferromagnetic metal. The current-induced spin density is calculated using the linear response theory and the Green function formalism.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1210-1212
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanostructuring and Hardness Investigations of Thin Films by Scanning Force Microscopy
Autorzy:
Nowicki, M.
Richter, A.
Ries, R.
Oszwałdowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1968828.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
68.35.-p
Opis:
The scanning force microscope was used to scratch thin films and to write nanoscale pattern on surfaces as well as to perform nanoindentation for hardness measurements. Different thin film materials such as C$\text{}_{60}$ films, diamond-like carbon, metals and semiconducting films have been investigated.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 437-441
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topographic and Energetic Heterogeneity Studies of Oxidized Graphite Surface by Scanning Tunneling Microscopy/Spectroscopy and Photoelectron Spectroscopy
Autorzy:
Klusek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1963284.pdf
Data publikacji:
1997-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
71.20.-b
Opis:
Scanning tunneling microscopy and spectroscopy and X-ray photoelectron spectroscopy are used to study oxidation effects of nitric acid on a highly-oriented pyrolytic graphite surface. Various etching times at constant temperature are applied in order to create local binding sites on the surface without creating deep defects. A single and paired chains structure, different from pure graphite at atomic scale, is shown by scanning tunneling microscopy. This can be explained by the presence of oxygenate groups on the surface, revealed by X-ray photoelectron spectroscopy. Both scanning tunneling spectroscopy and X-ray photoelectron spectroscopy demonstrate the vanishing of π bands characteristic of sp$\text{}^{2}$ graphite hybridization. This, in turn, can be explained by dehybridization related to new bondings of the graphite carbons in the oxygenate groups. An important result of area averaging spectroscopy is the observed energetic heterogeneity considered in terms of the changes of local electronic density of states of the oxidized surface.
Źródło:
Acta Physica Polonica A; 1997, 91, 3; 569-582
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermally Assisted Current-Driven Dynamics in Asymmetric Spin Valves
Autorzy:
Gmitra, M.
Barnaś, J.
Horváth, D.
Powiązania:
https://bibliotekanauki.pl/articles/1813513.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.70.Cn
Opis:
Current-induced steady precessional modes in standard spin valves are usually excited as an interplay of spin-transfer torque, Gilbert damping, and external magnetic field. We propose an asymmetric spin valve, in which the spin current can excite stationary precessional modes also at zero external magnetic field. We also show that finite temperature can induce transitions between different dynamical modes. These transitions, in turn, lead to telegraph noise in magnetoresistance.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 31-34
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Stress-Annealing Enhancement of Magnetoimpedance Effect in $Fe_{89.8}Ni_{1.5}Si_{5.2}B_{3}C_{0.5}$ Metallic Glass Ribbons
Autorzy:
Kalezić-Glišović, A.
Mitrović, N.
Maričić, A.
Djukić, S.
Simeunović, R.
Powiązania:
https://bibliotekanauki.pl/articles/1813538.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Ch
Opis:
In this study, the magnetoimpedance effect in magnetically soft $Fe_{89.8}Ni_{1.5}Si_{5.2}B_{3}C_{0.5}$ metallic glass ribbon samples with significant decrease in atomic percentage of metalloids content (less than 10 at.%) was investigated. Thermal treatments were performed by stress-annealing technique of up to 693 K/475 MPa/30 min. The critical frequency of about 600 kHz was observed as the point with the initial increase in magnetoimpedance ratio. Significant improvement of magnetoimpedance-response reaching the value ΔZ/Z=25% after stress-annealing at 693 K/130 MPa/30 min was recorded in samples with still amorphous structure at driving frequency of 4 MHz. The highest magnetoimpedance-element sensitivity was found for low magnetic field intensity (H ≤ 1 kA/m), where values of about 12%/kA/m were attained.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 103-106
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static and Dynamics of Topological Defects in Magnetic Dots
Autorzy:
Lévy, J.
Powiązania:
https://bibliotekanauki.pl/articles/1808035.pdf
Data publikacji:
2009-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.75.+a
Opis:
A Taylor expansion of dipole-dipole interaction in 2D systems defines a Landau-like local dipolar interaction in spin derivative field. The lowest order of this interaction gives the dipolar anisotropy. The next non-zero order is responsible for the appearance of magnetic vortices and hyperbolic defects. The following non-zero orders indicate the occurrence of higher topological defects such as double circle and of modulations. The arrangement of self-screened topological defects is discussed in agreement with the Monte Carlo simulations and experimental observations. Excited localized modes associated with these defects are classified.
Źródło:
Acta Physica Polonica A; 2009, 115, 5; 941-943
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przebóstwienie człowieka następstwem Wcielenia. Perspektywa chrystologiczna kard. Christopha Schönborna
the mystery of divinization of the manas a consequence of the Incarnation. Christoph Schönborn christological perspective
Autorzy:
Artemiuk, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/595101.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Opolski. Redakcja Wydawnictw Wydziału Teologicznego
Tematy:
przebóstwienie
Ch. Schönborn
Wcielenie
divinization
Incarnation
Opis:
In the article, the author shows the mystery of divinization of the man, according to Ch. Schönborn, as a consequence of the Incarnation. The idea of theosis, which is characteristic of Eastern Orthodoxy, harmonizes with the mystery of the Incarnation. The Christian understanding of theosis has nothing to do with self-divinization of the man, it is rather a break from the false image of God in order to open up to the full richness of Trinitarian life. The purpose of the Incarnation is the divinization of the man – for God has become a man so that a man can unite with God for eternity. The divinization of the man means making us sons, because Christ coming to earth did not want to change or replace the human nature, on the contrary – he wanted to "lead" it to where it had been before the fall, and thus, according to the Creator's original intention, – to immortality. Ch. Schönborn emphasizes that deification begins here on earth by the sacraments of the Church, which make our sonship in the Son "reproduce" His life in us.
W artykule autor ukazuje tajemnicę przebóstwienia człowieka, zgodnie z myślą Ch. Schönborna, jako następstwo Wcielenia. Idea theosis, charakterystyczna dla teologii wschodniej, współbrzmi harmonijnie z tajemnicą Wcielenia. Chrześcijańskie pojmowanie theosis nie ma nic wspólnego z samoubóstwieniem człowieka, jest raczej uwolnieniem się od fałszywego obrazu Boga, aby otworzyć się na pełne bogactwo życia trynitarnego. Celem Wcielenia jest przebóstwienie człowieka – po to bowiem Bóg stał się człowiekiem, aby człowiek mógł zjednoczyć się na wieki z Bogiem. Przebóstwienie człowieka oznacza jego „usynowienie”, bowiem Chrystus przychodząc na ziemię nie chciał zmienić czy zastąpić ludzkiej natury, pragnął ją „doprowadzić” tam, gdzie była przed upadkiem, a więc według pierwotnego zamierzenia Stwórcy – do nieśmiertelności. Ch. Schönborn podkreśla, że przebóstwienie dokonuje się już tutaj na ziemi przez sakramenty Kościoła, które sprawiają nasze usynowienie w Synu, „odtwarzają” w nas Jego życie.
Źródło:
Studia Oecumenica; 2019, 19; 143-164
1643-2762
Pojawia się w:
Studia Oecumenica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineralogical, geochemical and gemological investigation of Artova Ch-chalcedonies, Tokat – Turkey
Mineralogiczne, geochemiczne i gemologiczne badania Ch-chalcedonów z Artova, Tokat – Turcja
Autorzy:
Başıbüyük, Zeynel
Akbudak, Ilkay Kaydu
Gürbüz, Meltem
Powiązania:
https://bibliotekanauki.pl/articles/215774.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
Ch-chalcedony
gemstone
green quartz
gemology
Turkey
Ch-chalcedon
kamień szlachetny
zielony kwarc
gemologia
Turcja
Opis:
Ch-chalcedony is a green colored member of the quartz group of gem stones. The appearance of Ch-chalcedony is very similar to that of chrysoprase. Differently, Ch-chalsedonies have a chromium element instead of a nickel element as a trace element. Green quartz used in jewelery as a seal stone, in necklaces and rings and has been one of the most valuable quartz varieties throughout history, with its beautiful green color, more rare than other quartz varieties. The Ch-chalcedonies in the North Anatolian region is yellowish-white, brownish gray, light green to dark green in color ranging from several centimeters to one meter thick in veins and lenses in the Lower-Middle Eocene dolomitic limestones. Ch-chalcedonies are composed of fine-grained and occasionally fibrous needle-like quartz; in some examples, quartz is present together with cristobalite, tridimite and cuspidine minerals. According to geochemical investigations in Ch-chalcedonies, the main oxides that were determined are as follows: SiO2 was observed in the range of 95.86–97.81%, Fe2O3 was observed in the range of 0.61–0.91% and Cr2O3 was observed in the range of 0.125–0.168%. A trace element analysis of Ch-chalcedonies, shows their significant enrichments in: Ni, Mo, Cu, Mn, V, Cr and W, especially in the Cr (up to 705 ppm). The green color of the studied Cr-chalcedonies originates from the element chromium. Taking the possible reserves into account, the hardness, color, massive structures, mineralogical, petrographical and gemological features of Ch-chalcedonies in the region are evaluated together. It is determined that they are suitable for the production of jewelry and ornaments.
Ch-chalcedon jest składnikiem kwarcowej grupy kamieni szlachetnych w kolorze zielonym. Wygląd Ch-chalcedonu jest bardzo podobny do chryzoprazu. W szczególności Ch-chalcedony zawierają pierwiastek chromu zamiast pierwiastka niklu jako pierwiastka śladowego. Zielony kwarc stosowany w biżuterii jako kamień do: pieczętowania, naszyjników i pierścionków był jedną z najcenniejszych odmian kwarcu w historii dziejów. Ch-chalcedony w regionie północnoatlantyckim mają żółtawo-biały, brązowo-szary kolor od jasnozielonego do ciemnozielonego o grubości od kilku centymetrów do jednego metra, występują w żyłach i soczewkach wapieni dolomitycznych dolno-środkowego eocenu. Ch-chalcedony składają się z drobnoziarnistego i czasami włóknistego igłopodobnego kwarcu; w niektórych próbkach kwarc występuje razem z minerałami krystobalitu, tridymitu i kuspidyny. Według badań geochemicznych w Ch-chalcedonach zawartość głównych tlenków kształtowała się następująco: SiO2 zaobserwowano w zakresie 95,86–97,81%, Fe2O3 zaobserwowano w zakresie 0,61–0,91%, a Cr2O3 zaobserwowano w zakresie 0,125–0,168%. Analiza pierwiastków śladowych Ch-chalcedonów pokazuje ich znaczące wzbogacenie w: Ni, Mo, Cu, Mn, V, Cr i W, szczególnie w Cr (do 705 ppm). Zielony kolor badanych Ch-chalcedonów pochodzi od pierwiastka chromu. Obecnie oceniane są: możliwe zasoby, twardość, kolor, struktury, cechy mineralogiczne, petrograficzne i gemologiczne chalcedonów w analizowanym regionie. Ustalono, że te Ch-chalcedony nadają się do produkcji biżuterii i ozdób.
Źródło:
Gospodarka Surowcami Mineralnymi; 2020, 36, 1; 77-92
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Imaging the Surface Domain Structure of Amorphous Glass-Coated Microwires by Bitter Colloid
Autorzy:
Richter, K.
Varga, R.
Thiaville, A.
Powiązania:
https://bibliotekanauki.pl/articles/1199821.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.60.Jk
Opis:
The fast domain wall dynamics of amorphous glass-coated microwires can be changed drastically by properly selected annealing temperature. Here, the effect of thermal annealing on the surface domain structure of microwires is examined. Imaging the surface domain structure by Bitter colloid revealed the periodic pattern in each studied sample. Thermal annealing of microwires results in the five times increase of the domain wall velocity, as compared to the as-cast state. Influence of the surface domain structure on the fast domain wall propagation in microwires is discussed.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 72-73
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Symmetry of the Plain Domain Walls in the Plates of Cubic Ferro- and Ferrimagnets
Autorzy:
Tanygin, B. M.
Tychko, O.V.
Powiązania:
https://bibliotekanauki.pl/articles/1550586.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.50.Ah
75.60.Ch
Opis:
Magnetic symmetry of possible plane domain walls in arbitrary oriented plates of the crystal of hexoctahedral crystallographic class is considered. The symmetry classification is applied for ferro- and ferrimagnets.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 215-217
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transmission and Reflectionof Spin-Polarized Electrons Propagating through a Model Domain Wall
Autorzy:
Sýkora, R.
Turek, I.
Powiązania:
https://bibliotekanauki.pl/articles/1813508.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.25.Ba
75.60.Ch
Opis:
An analytically tractable simple model of a magnetic domain wall in a ferromagnetic metal is considered and, assuming the ballistic regime of electronic transport, transmission and reflection coefficients of such a wall are calculated within the stationary scattering theory. It is rederived that for realistic values of electron energies and domain wall widths the transmission coefficient is very close to one and thus an ideal domain wall itself (i.e. not taking into account other aspects such as disorder) does not essentially represent a hindrance to the transport.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 15-18
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure of $PrCo_2Ge_2$
Autorzy:
Diviš, M.
Vejpravová, J.
Rusz, J.
Prokleška, J.
Sechovský, V.
Powiązania:
https://bibliotekanauki.pl/articles/1813659.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Mb
71.70.Ch
Opis:
The intermetallic compound $PrCo_2Ge_2$ exhibits very interesting physical properties: antiferromagnetism below $T_N$ = 28 K, an order to order transition at $T_R$ = 8 K, a rich magnetic phase diagram, and huge magnetocrystalline anisotropy as observed by recent experiments on a single crystal in a magnetic field up to 14 T. We performed first principles calculations based on the density functional theory. The localized $4f^2$ configuration of $Pr^{3+}$ was treated using the open core approximation. The electronic densities of states were obtained and the position of the Fermi level was found. The hybridization between the Co-3d, Pr-5d and Ge-4p states is discussed. The calculated magnetic moment of Co is found to be quite small $(m_{Co} < 0.1 μ_B)$. The first principles calculations of the crystal field interaction were performed as well: the obtained crystal field parameters were used as the starting parameters for further refinement in comparison with experimental data of the magnetic susceptibility and specific heat. The crystal field splitting of the 4f states was determined.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 295-298
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Raman Scattering Photonic and Polaritonic Resonances in Semiconductor Microcavities
Autorzy:
Jusserand, B.
Fainstein, A.
Powiązania:
https://bibliotekanauki.pl/articles/1968001.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.-e
82.80.Ch
Opis:
Single and double optical resonant Raman scattering is demonstrated in semiconductor microcavities. Its evolution towards excitonic ingoing resonance relies on cavity-polaritons as intermediated steps of the inelastic scattering. Implications for high-sensitivity spectroscopy and low-power stimulated processes are emphasized.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 685-693
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Atomic and Electronic Structure of a Tip on Stm Images
Autorzy:
Jurczyszyn, L.
Mingo, N.
Flores, F.
Powiązania:
https://bibliotekanauki.pl/articles/1968715.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.79.Cz
61.16.Ch
Opis:
Theoretical studies of the influence of electronic and atomic structure of a tip on scanning tunneling microscopy images are presented. Results are discussed for the scanning of Al(001) and Al(001)+Xe surfaces performed within aluminum and nickel tips of a different geometry.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 307-315
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystal Field Analysis of Cr$\text{}^{3+}$ Energy Levels in LiGa$\text{}_{5}$O$\text{}_{8}$ Spinel
Autorzy:
Brik, M. G.
Avram, N. M.
Avram, C. N.
Powiązania:
https://bibliotekanauki.pl/articles/2047880.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Hj
71.70.Ch
Opis:
Detailed and consistent crystal field analysis of the LiGa$\text{}_{5}$O$\text{}_{8}$:Cr$\text{}^{3+}$ absorption spectrum is performed in the present paper by using the exchange charge model of crystal field. We calculate the crystal field parameters from the crystal structure date and diagonalize the crystal field Hamiltonian to obtain the energy level structure of Cr$\text{}^{3+}$ ions in LiGa$\text{}_{5}$O$\text{}_{8}$. The obtained energy levels and estimated Racah parameters B and C were compared with the experimental spectroscopic data; good agreement was demonstrated.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1055-1060
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric and Birefringent Properties of [(CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$]$\text{}_{5}$Cd$\text{}_{2}$CuCl$\text{}_{11}$ Solid Solutions in the Region of Their Phase Transitions
Autorzy:
Eliyashevskyy, Yu.
Kapustianyk, V.
Dacko, S.
Czapla, Z.
Batiuk, A.
Sveleba, S.
Powiązania:
https://bibliotekanauki.pl/articles/2044636.pdf
Data publikacji:
2006-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
65.40.-b
77.22.Ch
Opis:
On the basis of the optical and dielectric investigations of [(CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$]$\text{}_{5}$Cd$\text{}_{2}$CuCl$\text{}_{11}$ solid solutions the existence of phase transitions at T$\text{}_{1}$=175 K and T$\text{}_{2}$=117.5 K was confirmed. Both phase transitions were found to be shifted toward lower temperatures with respect to the corresponding transitions in the "host" [(CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$]$\text{}_{5}$Cd$\text{}_{3}$Cl$\text{}_{11}$ crystals. It was found that the proton conductivity in [(CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$ ]$\text{}_{5}$Cd$\text{}_{2}$CuCl$\text{}_{11}$ crystals is realized through the Grotthus mechanism. The investigations of the birefringent properties confirmed existence of the structural changes at T$\text{}_{0}$=320 K connected with the complex co-operative effect involving weakening of the hydrogen bonds and modification of the Jahn-Teller distortion with temperature.
Źródło:
Acta Physica Polonica A; 2006, 109, 2; 171-178
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystal Field Theory of Magnetic Behaviour of Er$\text{}_{2}$(SO$\text{}_{4}$)$\text{}_{3}$·8H$\text{}_{2}$O
Autorzy:
Gupta, R.
Ghosh, U. S.
Basu, C.
Powiązania:
https://bibliotekanauki.pl/articles/1945413.pdf
Data publikacji:
1996-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ch
75.10.Dg
Opis:
Using the most rigorous approach of direct diagonalization of the Hamiltonian matrix constructed in the complete basis states (364 in number) of the Er$\text{}^{3+}$ ion the observed magnetic susceptibility and anisotropy data of erbium sulphate octahydrate were simulated and the set of crystal field parameters was evaluated. This procedure automatically includes the effect of intermediate coupling and the J-mixing under the crystal field. It was also demonstrated that such rigorous calculation using complete basis states is necessary in order to evaluate the correct set of parameters which may widely differ from the values obtained from approximate calculations previously performed using partial number of basis states of the ion concerned.
Źródło:
Acta Physica Polonica A; 1996, 89, 5-6; 649-655
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Artystyczne założenia tradycyjnego teatru koreańskiego p’ansori w ujęciu Sin Chae-hyo (1812-1884)
Artistic principles of the traditional Korean p’ansori theatre in Sin Chae-hyo(1812–1884)’s theory
Autorzy:
Rynarzewska, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/577901.pdf
Data publikacji:
2020-05-28
Wydawca:
Polskie Towarzystwo Orientalistyczne
Tematy:
p’ansori
Korean theatre
Sin Chae-hyo
kwangdae
nŏ’rŭmsae
tŭg’ŭm
sasŏl ch’ire
inmul ch’ire
Opis:
The p’ansori performance represents one of the three main genres of traditional Korean theatre. It was presented by professional singers (kwangdae), who told an epic story taken from shamanic songs, folk stories and classic literature. P’ansori began to develop at the end of the 17th century and over the next two centuries was passed down in the oral tradition. Artistic practice was undermined in the second half of the 19th century by Sin Chae-hyo (1812-1884), who wrote down a few p’ansori and was the first to formulate its theoretical principles. He depicted four basic artistic components of p’ansori, including “acting talent” (nŏ’rŭmsae), “vocal talent” (tŭg’ŭm), “narrative talent” (sasŏl ch’ire) and “presence” (inmul ch’ire). Considered as key components, they were presented in the poetic work by Sin Chae-hyo, entitled Kwangdae ka (Song of the actor, around 1875). The main purpose of this article is to identify and define the components that constitute the artistic essence of p’ansori theatre.
Źródło:
Przegląd Orientalistyczny; 2019, 3-4(271-272); 275-292
0033-2283
Pojawia się w:
Przegląd Orientalistyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prognozowanie wielkości emisji CH4 z fermentacji jelitowej oraz hodowli zwierząt gospodarskich z wykorzystaniem sztucznej sieci neuronowej Flexible Byesian Models
Prediction of CH4 emissions from enteric fermentation and livestock farming with the use of artificial neural network Flexible Byesian Models
Autorzy:
Kolasa-Więcek, A.
Powiązania:
https://bibliotekanauki.pl/articles/336225.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
emisja CH4
fermentacja jelitowa
zwierzęta gospodarskie
sztuczna sieć neuronowa
CH4 emissions
fermentation
livestock farming
artificial neural network
Opis:
Prezentowane badania miały na celu prognozowanie ilości emisji CH4 z produkcji zwierząt hodowlanych w Polsce w zależności od wielkości hodowli oraz potencjalnych emisji pochodzących z fermentacji jelitowej zwierząt. Predykcje prowadzono z wykorzystaniem sztucznej sieci neuronowej Flexible Byesian Models. Przy użyciu testu Pearsona wskazano korelacje rozpatrywanych czynników względem badanych parametrów.
The aim of presented study was to forecast the CH4 emissions from livestock production in Poland and the potential emissions from enteric fermentation of animals. Predictions were carried out using artificial neural network Flexible Byesian Models. Correlations of selected terms of the factors considered in relation to the parameters were examined using Pearson's test.
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2011, 56, 2; 90-93
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Właściwości tribologiczne powłok DLC smarowanych cieczą jonową
Tribological properties of DLC coatings lubricated by ionic liquid
Autorzy:
Madej, Monika
Kowalczyk, Joanna
Ozimina, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/1818867.pdf
Data publikacji:
2020
Wydawca:
Wydawnictwo AWART
Tematy:
a-CH coating
physical vapour deposition (PVD)
surface wear
powłoka a-CH
fizyczne osadzanie z fazy gazowej (PVD)
zużycie powierzchni
Opis:
W artykule przedstawiono wybrane właściwości powłoki TiN osadzonej na stali 100Cr6 techniką fizycznego osadzania z fazy gazowej (PVD). Określono parametry tribologiczne, a mianowicie współczynnik tarcia i zużycie liniowe na testerze TRB3 pracującym w skojarzeniu trącym kula-tarcza w ruchu ślizgowym. Tarcza wykonana była ze stali 100Cr6 z powłoką a-C:H, a kula ze stali 100Cr6. Badania wykonano w warunkach tarcia technicznie suchego i ze smarowaniem cieczą jonową bis(trifluorometylosulfonylo) amidem triheksylotetradecylofosfoniowym. Obserwacje struktury powłoki zrealizowano przy użyciu mikroskopu skaningowego, a analizę struktury geometrycznej powierzchni próbek przed i po testach tribologicznych wykonano profilometrem optycznym. Wyniki badań wskazały, że mniejszą wartość współczynnika tarcia, lecz większe zużycie tarczy uzyskano w warunkach smarowania cieczą jonową.
The paper presents selected properties of a-C:H coating deposited on 100Cr6 steel deposited by physical vapour deposition PVD. Tribological parameters were determined on the TRB3 tester operating in a ball-disc friction combination in sliding motion. The disc was made of 100Cr6 steel with a-C:H coating, and the ball was made of 100Cr6 steel. The tests were conducted under dry friction conditions and with trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)amide ionic liquid lubrication. The coating structure was observed using a scanning electron microscope. The surface texture of the samples was performed with an optical profilometer. The test results showed that the smaller coefficient of friction and wear of disc was obtained after friction with lubrication ionic liquid.
Źródło:
Obróbka Metalu; 2020, 4; 40--46
2081-7002
Pojawia się w:
Obróbka Metalu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Проблема личности в контексте исторической памяти: чеховские аллюзии в комедии Н. Рудковского «Дожить до премьеры»
The problem of personality in the context of historic memory: Allusions to Chekhov in Rudkovsky’s comedy To live to the premiere
Autorzy:
Ищук-Фадеева, Нина
Powiązania:
https://bibliotekanauki.pl/articles/22606717.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
personality
allusions
historic memory
Chеkhov
Rudkovsky
drama
Opis:
The article addresses the semantic relations of Rudkovsky, a modern playwright, with Chekhov’s comedies. The self-consciousness of a person in Chekhov’s drama is directly connected with the historic memory, and this idea is interpreted in Rudkovsky’s works through the theatrical experiment, allowing the actresses to go through war as a personal experience, and for the audience – to set right “the joint” of time.
Źródło:
Acta Universitatis Lodziensis. Folia Litteraria Rossica; 2011, 4; 32-44
1427-9681
2353-4834
Pojawia się w:
Acta Universitatis Lodziensis. Folia Litteraria Rossica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
STM/AFM Observations of Co/Cu Magnetic Multilayers
Autorzy:
Aleszkiewicz, M.
Kalinowski, R.
Czajka, R.
Polewska, W.
Wawro, A.
Baczewski, L. T.
Raułuszkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1955472.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
68.65.+g
68.55.Jk
Opis:
UHV deposited magnetic Co/Cu multilayers were investigated by means of scanning tunneling microscopy (STM) and atomic force microscopy (AFM). Surface of the sample i.e. upper covering layer in "plane" configuration and individual sublayers in "cross-section" configuration were investigated. A possibility of structure characterization of metallic multilayers by STM and AFM in the cross-section configuration is demonstrated.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 311-314
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Piezomagnetic Dependences on Magnetic Bias Field of Annealed at 450°C Fe-Cu-Nb-Si-B Alloy
Autorzy:
Kaczkowski, Z.
Milewska, E.
Duhaj, P.
Vlasák, G.
Powiązania:
https://bibliotekanauki.pl/articles/1956531.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Nt
75.80.+q
75.60.Ch
Opis:
Magnetic field dependences of the piezomagnetic dynamics, magnetomechanical coupling and elasticity moduli in the Fe$\text{}_{73.5}$Cu$\text{}_{1}$Nb$\text{}_{3}$ Si$\text{}_{13.5}$B$\text{}_{9}$ alloy in an as-quenched state and annealed in vacuum for 1 h at 450°C were investigated. The maximum value of the magnetomechanical coupling coefficient was equal to 0.15 for the as-quenched state and 0.7 after annealing at 450°C. The changes of the elasticity moduli (ΔE effect) from about 60 to 180 GPa were observed after annealing at this temperature. These changes are connected with magnetostriction (equal to 25.8×10$\text{}^{-6}$ at saturation), internal stresses, defects, mechanical, magnetic and heat treatment history.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 487-490
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anisotropic Magnetic Susceptibility of Neodymium Substituted SrLaAlO$\text{}_{4}$ Crystals
Autorzy:
Fink-Finowicki, J.
Puźniak, R.
Baran, M.
Jabłoński, R.
Berkowski, M.
Pajączkowska, A.
Szymczak, H.
Powiązania:
https://bibliotekanauki.pl/articles/1931256.pdf
Data publikacji:
1994-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Hx
75.10.Dg
71.70.Ch
Opis:
The uniaxial anisotropy of magnetic properties of SrLa$\text{}_{1-x}$Nd$\text{}_{x}$AlO$\text{}_{4}$ single crystals (x = 0.01 and 0.05) was found from the measurements of temperature dependencies of magnetic susceptibility. Results of measurements, with magnetic field along a- and c-axis, are compared with the similar data obtained for CaNdAlO$\text{}_{4}$ crystal. The successful description of experimental data was done in frames of the crystal field approximation. The anisotropy of magnetic susceptibility appears due to crystal field acting on magnetic neodymium ions in a system without exchange interactions.
Źródło:
Acta Physica Polonica A; 1994, 85, 3; 633-637
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In Search of Entropy
Autorzy:
Letessier, J.
Rafelski, J.
Tounsi, A.
Powiązania:
https://bibliotekanauki.pl/articles/1931272.pdf
Data publikacji:
1994-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
25.75.+r
05.30.Ch
12.38.Mh
Opis:
Entropy is a quantity characterizing the arrow of time in the evolution of a physical system - in every irreversible process the entropy increases. In elementary interactions such as relativistic collisions of two atomic nuclei there is considerable particle production and hence entropy production. We address here a number of questions which arise naturally in this context. When and how is entropy produced in a quantum process, such as is a nuclear collision? How is the particle production related to entropy production? How does one measure the entropy produced in the reaction? We also consider certain fundamental approaches to the problem of entropy definition in quantum physics.
Źródło:
Acta Physica Polonica A; 1994, 85, 4; 699-716
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Route to Chaos for Domain Walls with a Model of Stray Field
Autorzy:
Sukiennicki, A.
Kosiński, R. A.
Żebrowski, J. J.
Powiązania:
https://bibliotekanauki.pl/articles/1931285.pdf
Data publikacji:
1994-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.+b
75.10.Hk
75.60.Ch
Opis:
The route to chaos of domain wall in thin magnetic film, which is described by Słonczewski's equations of motion, is analyzed numerically. Hagedorn's model of surface stray field is applied. Ranges of periodic and chaotic wall motion as a function of constant in time, drive field are found. Comparison of results with those obtained for Hubert's model of the stray field is made.
Źródło:
Acta Physica Polonica A; 1994, 85, 5; 791-796
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple Quantitative Analysis of Spatio-Temporal Diagrams for Domain Wall Dynamics
Autorzy:
Kosiński, R. A.
Stępień, R.
Powiązania:
https://bibliotekanauki.pl/articles/1932111.pdf
Data publikacji:
1995-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.+b
75.10.Hk
75.60.Ch
Opis:
A quantitative analysis of spatio-temporal diagrams, which describe the dynamics of a chosen, spatially extended dynamic system (a domain wall in a thin magnetic garnet film) is presented. Two quantifiers characterizing such diagrams - a correlation function and power spectrum density function - were calculated using solutions of equations of motion. It was found that introducing these quantifiers to the analysis of spatio-temporal diagrams enables one to effectively characterize the type and the properties of motion of the considered system.
Źródło:
Acta Physica Polonica A; 1995, 87, 3; 575-583
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric and Optical Studies of Homologous Series of Bicyclo[2,2,2]octane Derivatives with -NCS Terminal Group
Autorzy:
Herba, H.
Żywucki, B.
Czechowski, G.
Bauman, D.
Wąsik, A.
Jadżyn, J.
Powiązania:
https://bibliotekanauki.pl/articles/1933452.pdf
Data publikacji:
1995-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.Gd
77.22.Ch
78.20.Fm
Opis:
The static dielectric constants and the optical birefringence for four members of the homologous series of bicyclo[2,2,2]octane derivatives with -NCS terminal group (pentyl to octyl) have been measured as a function of temperature. From the dielectric anisotropy, the optical birefringence as well as the polarized absorption spectra of the dichroic dye dissolved in the liquid crystalline host the order parameter has been determined. The results obtained by using various experimental methods have been compared with those calculated from the Maier-Saupe mean field theory. It has been found that the order parameter for the successive homologues shows alternation similar to that exhibited for the nematic-isotropic transition temperature.
Źródło:
Acta Physica Polonica A; 1995, 87, 6; 985-994
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Polarized STM Investigation of Magnetic Domain Walls
Autorzy:
Kubetzka, A.
Pietzsch, O.
Bode, M.
Ravlić, R.
Wiesendanger, R.
Powiązania:
https://bibliotekanauki.pl/articles/2036893.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.75.+a
68.37.Ef
Opis:
The potential of spin-polarized scanning tunneling microscopy and spectroscopy for the investigation of magnetism at the nanometer scale is demonstrated by focusing on magnetic domain walls. After reviewing different measurement modes it is shown that in addition to wall widths and positions the determination of their exact profiles provides further insight into the samples' magnetic properties.
Źródło:
Acta Physica Polonica A; 2003, 104, 3-4; 259-268
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Annealing Temperature on Magnetic Properties of Vitrovac 6030
Autorzy:
Lachowicz, H. K.
Popławski, F.
Żuberek, R.
Kulik, T.
Ślawska-Waniewska, A.
Kuźmiński, M.
Yu, S. C.
Dynowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/2011100.pdf
Data publikacji:
1999-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Cc
75.50.Kj
75.60.Ch
Opis:
Co-Fe-Mo-Mn-Si-B metallic glass ribbon (Vitrovac 6030) was subjected to the isothermal annealing at temperatures in the range 523-873 K so as to produce a series of samples with gradually coarser microstructure. For this series of samples a giant increase in the coercivity, exceeding three orders of magnitude, is observed. This increase is interpreted in terms of the strengthening of the pinning effect of the nanocrystalline structure on the moving domain walls. It is shown that the anisotropy of the created crystallites is mainly responsible for the increase in the pinning force since the effective anisotropy seen by the wall becomes larger and larger with the gradual increase in the density and size of the grown particles.
Źródło:
Acta Physica Polonica A; 1999, 96, 3-4; 483-494
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Improvement of Atomic Force Microscope Suitable for Magnetic Domain Structure Measurements
Autorzy:
Sveklo, I.
Dobrogowski, W.
Kisielewski, M.
Maziewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2013164.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.-i
75.30.Pd
61.16.Ch
Opis:
Based on commercial Burleigh METRIS$\text{}^{TM}$-2000 Atomic Force Microscope two methods of magnetic force measurements were realised. The developed system was successfully applied for study of magnetic structure of both YIG-garnet and CoNi/Pt magneto-optic multilayers.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 527-530
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Point-Contact Spectroscopy of Ce$\text{}_{1-x}$RE$\text{}_{x}$Ni$\text{}_{5}$ (RE = Pr, Nd)
Autorzy:
Kačmárová, T.
Reiffers, M.
Garcia Soldevilla, J.
Goméz Sal, J. C.
Espeso, J. I.
Blanco, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/2013409.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Jn
71.70.Ch
71.70.Gm
Opis:
We report on the study of the electron-quasiparticle interaction function in Ce$\text{}_{1-x}$RE$\text{}_{x}$ Ni$\text{}_{5}$ (RE = Pr, Nd) pseudobinary compounds for x = 0, 0.2, 0.5, 0.8, and 1 measured by means of point-contact spectroscopy. The measured point-contact spectra (d$\text{}^{2}$V/dI$\text{}^{2}$ - directly proportional to the electron- quasiparticle interaction function) of the heterocontacts between Ce$\text{}_{1-x}$ RE$\text{}_{x}$Ni$\text{}_{5}$ and Cu in the ballistic regime are presented.zapisz i p
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 795-798
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of Complex Permittivity of Oil-Based Ferrofluid in Magnetic Field
Autorzy:
Kúdelčík, J.
Hardoň, Š.
Varačka, L.
Powiązania:
https://bibliotekanauki.pl/articles/1030262.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.65.Cb
77.22.Gm
77.22.Ch
Opis:
The changes of dielectric parameters in oil-based ferrofluid have been measured in an external magnetic field. The frequency dependent real permittivity and the dissipation factor were measured within the frequency ranges from 1 mHz to 2 MHz by a capacitance method. These parameters have been studied in combined electric and magnetic field, when fields were parallel and perpendicular. The Cole-Cole model has been used to analyze measured data. When a magnetic field was applied, the interaction between the magnetic field and magnetic moments of nanoparticles led to the aggregation of magnetic nanoparticles to new structures - thick chains which had influence on the value of dielectric permittivity. At constant magnetic field the dependence of real permittivity and tanδ on angle between the electric and magnetic field (anisotropy) were measured, too. The various influences of magnetic field development on the investigated liquid are discussed.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 931-933
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Interference Effects in Visible-Near Infrared Spectral Range for Arrays of Vertically Aligned Multiwalled Carbon Nanotubes
Autorzy:
Wąsik, M.
Judek, J.
Świtkowski, K.
Zdrojek, M.
Powiązania:
https://bibliotekanauki.pl/articles/1030331.pdf
Data publikacji:
2017-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ci
78.67.Ch
81.07.De
Opis:
Based on the reflectance spectra for radiation wavelength from about 380 nm to 1.8 μm, the optical interference effects in vertically aligned multiwalled carbon nanotubes films are studied. We performed the measurements for two complementary polarization states of incoming radiation (s- and p-polarization) for nanotubes arrays sparse enough for interference effects to be possible to observe. By performing the measurements for different wavelengths and incidence angles, we mapped the evolution of interference maxima/minima of reflectance signal. The results from this novel approach indicate that for the radiation polarized perpendicularly to tubes axis (s-polarization), the real part of the effective refractive index can be estimated from the classic Fabry-Pérot model. In order to describe the differences between spectra obtained for s- and p-polarizations we discuss the most important factors that affect the reflectance signal in case of investigated nanotubes arrays.
Źródło:
Acta Physica Polonica A; 2017, 131, 2; 232-236
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DC Magnetic Properties of Amorphous Vitrovac Ribbon
Autorzy:
Kollár, P.
Birčáková, Z.
Füzer, J.
Kuźmiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1031042.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Jk
75.60.Ch
75.60.Ej
Opis:
Soft magnetic amorphous Co-based materials prepared by rapid quenching method in the form of thin ribbon are well-known due to their excellent soft magnetic properties as high permeability, low coercivity, and low magnetic losses in kHz range. The amorphous Co-Fe-B-Si material Vitrovac® 6155 U55 produced by Vacuumschmelze GmbH & Co. KG belongs to this class of materials and was investigated in as-delivered state. The aim of this work was to study DC magnetization process by various experimental methods. We have measured magnetization curve by fluxmeter based hysteresis graph and hysteresis loops by three different fluxmeter based hysteresis graphs, exhibiting significant differences. The first and the second hysteresis graph perform the hysteresis loops measurement by the point-by-point method, either with commutative or with summing steps. The third one is AC hysteresis graph working at very low frequencies down to 7 mHz, performing the continuous method. The explanation of this result is based on the structural after effect influencing the domain wall displacement. We assumed that the domain structure consists of very small number of domain walls responsible for magnetization process, which was confirmed by the visualization of static domain structure by a computer-controlled setup based on the Kerr effect.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 675-677
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Properties of Microcrystalline Cellulose "Ceramics-Like" Composites Incorporated with LaVO₄:Sm Oxide Compound
Autorzy:
Nedielko, M.
Alekseev, O.
Chornii, V.
Kovalov, K.
Lazarenko, M.
Nedilko, S.
Scherbatskyi, V.
Boyko, V.
Sheludko, V.
Powiązania:
https://bibliotekanauki.pl/articles/1052560.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.Ch
78.55.-m
78.66.Sq
Opis:
Composite samples based on microcrystalline cellulose matrix incorporated with micro/nanoparticles of La_{0.7}Sm_{0.3}VO₄ complex oxide were made by cool pressing procedure. Morphology, crystallinity and characteristic luminescence and dielectric properties of the composites were studied. Their morphology can be described as "ceramics-like" type, as it consists of cellulose plates and embedded oxide particles. Luminescence spectra of the composites covers the range of the whole visible light, 350-750 nm, and comprises both wide band and narrow lines, related with host and oxide luminescence, respectively. Temperature dependences of the dielectric permittivity of composites showed the impact of the oxide particles on the characteristics of the microcrystalline cellulose. An assumption was made that this influence can be affected via water molecules, hydroxyl groups or molecules of the ambient gases. Studied composites can be perspective luminescent materials for transformation of ultraviolet and violet radiation into green-red light.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 838-842
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Surfaces of FeNbCuBSiP Ribbons
Autorzy:
Butvin, P.
Butvinová, B.
Kuzminski, M.
Ślawska-Waniewska, A.
Sitek, J.
Maťko, I.
Kadlečíková, M.
Powiązania:
https://bibliotekanauki.pl/articles/1201084.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.50.Tt
75.60.Ch
Opis:
Boron was partially substituted by phosphorus (3 at.%) in two Si-poor Fe-Nb-Cu-B-Si Finemets. Mostly non-significant changes were observed after vacuum annealing at 500°C, whereas equivalent Ar annealing resulted in significantly better soft-magnetic properties, which suffer from compressive surfaces stress. Possibly by hampering surface crystallization, the substitution eased the surfaces stress and reduced undesired off-axis anisotrophy at the cost of limiting the useful annealing temperature.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 152-153
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric and AC Conductivity οf Potassium Perchlorate, $KCLO_{4}$
Autorzy:
Abdelmoneim, H.
Powiązania:
https://bibliotekanauki.pl/articles/1537744.pdf
Data publikacji:
2010-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ph
77.22.Ch
77.84.Bw
Opis:
The AC conductivity σ (ω) and the complex dielectric permittivity ε*(ω) were studied as function of temperature 300 K < T < 600 K and at some selected frequencies (1-20 kHz) for polycrystalline sample of $KClO_4$. The differential thermal analysis (DTA) thermograph was also performed. The combined data support each other and indicate the existence of a structural phase transition at ≈ 575 K. Moreover, the temperature dependence of the ac conductivity behaves in accordance with Arrhenius relation, whereas the frequency dependent conductivity obeys the power law $σ(ω) = Aω^{s(T)}$. The behavior of s with temperature suggests that the hopping over the barrier model prevails. No evidence for the existence of a ferroelectric phase transition at the transition temperature.
Źródło:
Acta Physica Polonica A; 2010, 117, 6; 936-940
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetodielectric Properties of Transformer Oil Based Magnetic Fluids
Autorzy:
Timko, M.
Kopcansky, P.
Molcan, M.
Tomco, L.
Marton, K.
Molokac, S.
Rybar, P.
Stoian, F.
Holotescu, S.
Taculescu, A.
Powiązania:
https://bibliotekanauki.pl/articles/1428655.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.65.Cb
77.22.Gm
77.22.Ch
Opis:
This contribution is devoted to study of dielectric and magnetodielectric properties in transformer oil based magnetic fluid. The dielectric permittivity and their anisotropy at various mutual orientation electric (50 Hz) and magnetic field were shown at the different volume concentrations of nanoparticles at room temperature. The linear increase of dielectric constant with volume concentration was confirmed which is in good agreement with the theoretical Maxwell prediction. The dielectric anisotropy factor g(B, ω) is very close to g=1. The values of permittivity increased with the increase of volume fraction of magnetite nanoparticles. The highest value of anisotropy characterized by deviation of permittivity $Δε=ε_{∥} - ε_{⊥}$ was found for the highest volume concentration which could mean that no aggregation of magnetite nanoparticles had appeared.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1253-1256
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scaling Behaviour of Chirality Dependent Domain Wall Pinning in Planar Nanowires
Autorzy:
Eastwood, D.
Bogart, L.
Atkinson, D.
Powiązania:
https://bibliotekanauki.pl/articles/1506885.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.78.Cd
81.07.Gf
Opis:
Micromagnetic modelling is used to establish the dimensional scaling dependence of the magnetic fields required for domain wall injection and chirality dependent pinning in planar permalloy nanowires with asymmetric structural notches. The wire width, thickness and notch constriction width are systematically varied whilst the axial magnetization is reversed under a globally applied magnetic field. A component of magnetic field transverse to the direction of propagation is applied throughout the reversal to control the domain wall chirality, and therefore determine the strength of pinning at the notch. We deduce that thicker wires with a narrower width cause larger depinning fields and stronger chirality dependent pinning, an observation relevant for domain wall memory applications, and particularly those exploiting chirality dependent pinning in nanowires.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 719-722
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Domain Wall Dynamics in Bistable Ferromagnetic Laminations
Autorzy:
Kravčák, J.
Šuhajová, V.
Powiązania:
https://bibliotekanauki.pl/articles/1506929.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.60.Ej
75.60.Jk
Opis:
The presented article deals with a model of magnetic reversal in conducting lamination with a one central ferromagnetic layer and two outer non-ferromagnetic layers. Considering a single rigid 180° domain wall spreading through the axially magnetized ferromagnetic layer the calculation of induced eddy currents in lamination is performed. The dependence of single domain wall mobility on the thickness of ferromagnetic layer is displayed. The effect of non-homogeneous magnetic field intensity generated by eddy currents is also discussed.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 734-735
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Domain Wall Dynamics in Amorphous Ferromagnetic Wire with Small Helical Anisotropy
Autorzy:
Ziman, J.
Kladivová, M.
Onufer, J.
Zagyi, B.
Powiązania:
https://bibliotekanauki.pl/articles/1507178.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.60.Jk
75.50.Kj
Opis:
Dynamics of the domain wall between circular magnetic domains in amorphous ferromagnetic $Co_{68.2}Fe_{4.3}Si_{12.5}B_{15}$ wire was studied in a small region around the domain wall equilibrium position in an inhomogeneous magnetic field. The wire was prepared using the in-rotating-water-quenching technique. Small helical anisotropy was induced in the wire by current annealing and simultaneous application of tensile stress and torsion. The inhomogeneous magnetic field acted on domain wall by restoring force directly proportional to the displacement of the domain wall from its equilibrium position. Domain wall position was monitored by circular magnetic flux measurements from which it results that domain wall motion can be modeled by the motion of a very strongly damped pendulum. The value of domain wall mobility obtained from these experiments is in good agreement with the values calculated and measured for domain wall driven by a constant magnetic field.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 778-779
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations on the Anisotropic g Factors of the $Ni^{3+}$ Site in $La_2Ni_{0.5}Li_{0.5}O_4$
Autorzy:
Kuang, M.
Wu, S.
Zhang, Z.
Song, B.
Powiązania:
https://bibliotekanauki.pl/articles/1400149.pdf
Data publikacji:
2013-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Fc
71.70.Ch
75.10.Dg
Opis:
The anisotropic g factors $g_{∥}$ and $g_{⊥}$ of $La_2Ni_{0.5}Li_{0.5}O_4$ are theoretically investigated using the perturbation formulae of the g factors for a low spin $(S=1//2) 3d^7$ ion in tetragonally elongated octahedra. The studied $Ni^{3+} (3d^7)$ center arises from the original $Ni^{2+}$ capturing one hole by $Li^{+}$ doping. The positive anisotropy $\Delta g (= g_{⊥}-g_{∥})$ can be ascribed to the lowest $\text{}^2 A_{1g}$ state due to the obvious (about 0.14 Å) tetragonal elongation of the oxygen octahedron around the $Ni^{3+}$ site via the Jahn-Teller effect, and the effective magnetic moment is also interpreted in a uniform way. The calculated results show good agreement with the experimental data, and the imperfection of the previous studies based on various adjusted tetragonal energy splittings without correlating to the local structure of the magnetic center is thus overcome in this work.
Źródło:
Acta Physica Polonica A; 2013, 123, 4; 734-736
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations on the Spin-Hamiltonian Parameters and Local Structure of the Orthorhombic $Cu^{2+}$ Center in $PbTiO_3$ Crystal
Autorzy:
Chao-Ying, Li
Li-Bin, Cheng
Xue-Mei, Zheng
Powiązania:
https://bibliotekanauki.pl/articles/1400511.pdf
Data publikacji:
2015-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Fc
75.10.Dg
71.70.Ch
Opis:
The spin-Hamiltonian parameters (the g factors $g_{i}$ and the hyperfine structure constants $A_{i}$, i = x, y, z) and local structure of the $Cu^{2+}$ center in $PbTiO_{3}$ are theoretically studied by using the perturbation formulae of these parameters for a $3d^{9}$ ion in an orthorhombically elongated octahedra. The orthorhombic center is attributed to $Cu^{2+}$ occupying the host $Ti^{4+}$ site associated with a nearest-neighbouring oxygen vacancy $V_{O}$ along the c-axis, and the impurity $Cu^{2+}$ off-center displacement $\Delta Z_{L}$ ( ≈0.18 Å) is smaller than that of the host $Ti^{4+}$ site ($\Delta Z_{H}$≈ 0.3 Å). Meanwhile, the planar $Cu^{2+}-O^{2-}$ bonds are found to experience the relative variation ΔR ( ≈ 0.098 Å) along the a- and b-axes, respectively, due to the Jahn-Teller effect and the size mismatching substitution of $Ti^{4+}$ by $Cu^{2+}$. The theoretical spin-Hamiltonian parameters based on the above defect structure agree well with the observed values.
Źródło:
Acta Physica Polonica A; 2015, 127, 6; 1671-1675
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatially Resolved Chemistry on Bimetallic Surfaces
Autorzy:
Behm, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/1968689.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
68.10.Jy
82.65.-i
Opis:
The local chemical properties of bimetallic surfaces, which are often drastically different from those of each of the components, will be discussed. Using CO adsorption as a probe molecule it will be shown for two model systems, Au/Pd(111) and Pt/Ru(0001), that their chemical properties depend decisively on the local surface structure and that the correct interpretation of area integrating spectroscopic and kinetic data obtained from such surfaces requires detailed knowledge of their (defect) structure and of the distribution of the different components in the surface layer. It will further be shown that information on the local chemical properties of specific structural elements such as monolayer islands and monolayer island edges, and specific surface ensembles can be gained by applying high resolution scanning tunneling microscopy imaging and area integrating spectroscopic techniques in combination to bimetallic surfaces whose morphology and composition is varied in a systematic and controlled way. Based on experimental results adsorption on a monolayer A / substrate B system is suggested as a model for gaining information on the modifications in chemical properties of AB alloy surfaces due to metal-metal interactions.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 259-272
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface State of Gd(0001) Films on W(110): Scanning Tunneling Spectroscopy Study
Autorzy:
Bode, M.
Pascal, R.
Getzlaff, M.
Wiesendanger, R.
Powiązania:
https://bibliotekanauki.pl/articles/1968692.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.At
68.55.Jk
61.16.Ch
Opis:
The surface electronic structure of Gd(0001)/W(110) has been studied by scanning tunneling spectroscopy in dependence of the coverage. An exchange split $d_{z^{2}}$-like surface state which is well known from photoemission experiments was already found for coverages as low as 2 ML. The exchange splitting was found to increase with increasing coverage up to the fourth ML. For higher coverages the electronic structure remains constant. We found spectra that are shifted by ≈ 25 meV, possibly due to stacking faults.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 273-280
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applications of Scanning Tunneling Microscopy To Solid State Physics
Autorzy:
van Kempen, H.
Boon, E. J. G.
van der Wielen, M. C. M. M.
Wildöer, J. W. G.
Prins, M.
Jansen, R.
Schad, R.
Powiązania:
https://bibliotekanauki.pl/articles/1968742.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
68.35.Dv
71.55.Eq
Opis:
Due to the dependence of the tunnel current to material properties like work function, density of states, and spin polarization the scanning tunneling microscope can be used to study a number of solid state physics problems. This will be illustrated with some examples. The presented examples have in common that also the role of the tip properties have to be taken explicitly into account.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 323-331
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
STM Studies of the Proximity Effect in Superconducting Wires with Artificial Pinning Centers
Autorzy:
Levi, Y.
Millo, O.
Rizzo, N. D.
Prober, D. E.
Motowidlo, L. R.
Powiązania:
https://bibliotekanauki.pl/articles/1968775.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.50.+r
73.40.Gk
61.16.Ch
Opis:
Scanning tunneling microscopy and spectroscopy were applied to study the proximity effect with nanometer spatial resolution. The measurements were conducted on novel superconducting wires, which consist of an ordered array of submicron diameter normal metal filaments (Cu, Ni) embedded in a superconducting (NbTi) matrix. Spatially resolved information about the local density of states is obtained by taking I-V curves simultaneously with topographic images. Our data provide direct evidence on the interplay between the normal and superconducting constituents in the vicinity of the interface between them.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 425-430
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Easy-Plane Magnetic Anisotropy Induced by Stress-Annealing in Finemet-Type Materials
Autorzy:
Lachowicz, H. K.
Kane, S. N.
Gupta, A.
Gierlotka, S.
Pałosz, B.
Powiązania:
https://bibliotekanauki.pl/articles/1968937.pdf
Data publikacji:
1998-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.50.Kj
75.60.Ch
Opis:
It is shown that annealing under stress of FINEMET-type metallic glass ribbon (FeCuNbSiB) induces magnetic anisotropy of an easy-plane type (cross-section of the ribbon). This conclusion has been drawn analyzing experimental results obtained by means of Kerr-effect (domain structure) and Mössbauer spectroscopy operating in the so-called "magic angle" configuration which allows us to calculate all three spatial components of magnetization. Additionally, it is also shown that no crystallographic texture is created in the sample after stress-annealing, the feature which would have been an origin of the observed anisotropy.
Źródło:
Acta Physica Polonica A; 1998, 93, 5-6; 799-804
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
STM/AFM Images and Tunneling Spectra of Nd$\text{}_{2-x}$Ce$\text{}_{x}$CuO$\text{}_{4-y}$ Single Crystals
Autorzy:
Susła, B.
Sadowski, W.
Klimczuk, T.
Czajka, R.
Powiązania:
https://bibliotekanauki.pl/articles/1964375.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
74.72.Jt
68.35.Bs
Opis:
The results of the scanning tunneling microscopy and spectroscopy as well as atomic force microscopy measurements on the Nd$\text{}_{2-x}$Ce$\text{}_{x}$CuO$\text{}_{4-y}$ single crystals in ambient conditions are reported. Using the scanning tunneling microscopy we were able to modify the Nd$\text{}_{2-x}$Ce$\text{}_{x}$CuO$\text{}_{4-y}$ ab-plane in air under the conditions of sample bias voltage V$\text{}_{t}$=500 mV and set current I$\text{}_{s}$=0.3 nA. It is possible to prepare atomically flat and clean surfaces as well as to create new structures in a nanometer scale in these electron-doped materials. The similar processes were not observed during atomic force microscopy imaging.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 209-214
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the Spin-Hamiltonian Parameters and Local Structure for the Tetragonal $Mo^{5+}$ Centers in $CaWO_{4}$ Crystal
Autorzy:
Mei, Y.
Zheng, W.
Wei, C.
Powiązania:
https://bibliotekanauki.pl/articles/1377649.pdf
Data publikacji:
2014-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.He
71.70.Ch
75.10.Dg
Opis:
The spin-Hamiltonian parameters (g factors $g_{∥}$, $g_{⊥}$ and hyperfine structure constants $A_{∥}(A)$, $A_{⊥}(A)$, $A_{∥}(B)$ and $A_{⊥}(B)$, A(A) and A(B) belonging to isotopes $\text{}^{95}Mo^{5+}$ and $\text{}^{97}Mo^{5+})$ of $Mo^{5+}$ ion at the tetragonally-compressed tetrahedral $W^{6+}$ site in $CaWO_4$ crystal are calculated from the high-order perturbation formulae based on the two-mechanism model, where besides the contributions to spin-Hamiltonian parameters due to the crystal-field mechanism concerning the crystal-field excited states in the extensively-applied crystal-field theory, those due to charge-transfer mechanism concerning charge-transfer excited states (which are omitted in crystal-field theory) are included. The calculated results are in reasonable agreement with the experimental values. The calculations show that for the high-valence state $d^{n}$ ions (e. g., $Mo^{5+}$ considered) in crystals, the contributions due to charge-transfer mechanism should be taken into account in the studies of spin-Hamiltonian parameters. The local structure of $Mo^{5+}$ center in $CaWO_4$ crystal due to the impurity-induced local lattice relaxation is estimated from the calculations. The results are discussed.
Źródło:
Acta Physica Polonica A; 2014, 126, 6; 1275-1279
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Nanocrystallization Process on the Magnetomechanical Coupling in Fe-Si-B-Cu-Nb Alloy
Autorzy:
Kaczkowski, Z.
Małkiński, L.
Kuźmiński, M.
Müller, M.
Powiązania:
https://bibliotekanauki.pl/articles/1861130.pdf
Data publikacji:
1994-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.80.+q
75.60.Nt
75.60.Ch
Opis:
Magnetic and magnetoelastic properties of the Fe$\text{}_{73.5}$Si$\text{}_{16.5}$B$\text{}_{6}$Cu$\text{}_{1}$Nb$\text{}_{3}$ alloy change considerably during nanocrystallization process. Improvement of magnetic properties is accompanied by the decrease in piezomagnetic parameters such as magnetomechanical coupling and $\Delta E$-effect.
Źródło:
Acta Physica Polonica A; 1994, 85, 1; 201-204
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Point-Contact Spectroscopy of Crystalline Electric Field of Heterocontacts $PrB_6$ and $NdB_6$ with Pt
Autorzy:
Vasil'ová, M.
Pristáš, G.
Reiffers, M.
Flachbart, K.
Rusz, J.
Shitsevalova, N.
Powiązania:
https://bibliotekanauki.pl/articles/1813641.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.47.Np
71.70.Ch
74.50.+r
Opis:
Point-contact spectra of single crystals $PrB_6$ and $NdB_6$ are presented. We observed maxima connected with crystalline electric field excitations in agreement with previous results for applied voltage V>8 mV. Moreover, we observed maxima at 6 mV $(PrB_6)$ and 3 mV $(NdB_6)$, which are probably connected with phonon modes. Moreover, we observed phonon peak at 10.6 mV in $PrB_6$. Further measurements in magnetic fields and crystalline electric field calculations are necessary.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 267-270
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Current-Driven Magnetoresistance Oscillations in Asymmetric Spin Valves
Autorzy:
Gmitra, M.
BarnaŚ, J.
Powiązania:
https://bibliotekanauki.pl/articles/1814032.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.70.Cn
75.70.Pa
Opis:
Within the macroscopic model we have calculated spin-transfer torque in asymmetric spin valves in the diffusive transport limit.Such systems exhibit a non-standard angular dependence of the torque, which leads to current-induced precessional modes at zero external magnetic field. We have found that the frequency of magnetoresistance oscillations exhibits hysteretic behavior when the system is driven between two steady precessional regimes. A finite temperature can suppress the irreversibility and give rise to bistable regime where, both the precessional regimes coexist.
Źródło:
Acta Physica Polonica A; 2007, 112, 6; 1267-1270
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystal Field Analysis of $Cr^{3+}$ Doped $SrAl_{2}O_{4}$ Spinel
Autorzy:
Stanciu, M.
Ciresan, M.
Avram, N.
Powiązania:
https://bibliotekanauki.pl/articles/1791232.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ch
68.47.Jn
71.70.Gm
Opis:
The present work is devoted to the crystal field analysis of trivalent chromium doped in $SrAl_{2}O_{4}$ spinel in the frame of the exchange charge model of crystal field. Using the shell model and pair approximation, we optimize the geometric structure of the crystal. The approach enables the modeling of the crystal field parameters and thus calculates the energy level scheme of $Cr^{3+}$ ions in spinel $SrAl_{2}O_{4}$. The obtained results are compared with experimental data and discussed.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 544-546
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Cutting Fluid Containing Zinc Aspartate on the Wear of Cutting Tools During Turning
Wpływ cieczy obróbkowej z asparaginianem cynku na zużywanie narzędzi skrawających podczas toczenia
Autorzy:
Madej, Monika
Kowalczyk, Joanna
Ozimina, Dariusz
Nowakowski, Łukasz
Kulczycki, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/189185.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
cutting fluid
turning
friction
wear
cemented carbides
a-C:H coating
ciecz obróbkowa
toczenie
tarcie
zużycie
węgliki spiekane
powłoka a-C:H
Opis:
The paper presents the results of tests of the wear of cutting tools following the process of facing with lubrication with cutting fluids. The tests were carried out on a CNC lathe with the use of two cutting fluids: one based on mineral oil and the other containing zinc aspartate. After machining, the tool wear was measured using a stereoscopic inspection microscope. Observation of surface morphology and identification of elements was performed using a scanning electron microscope with a EDS analyser. Measurements of the geometric structure of the surface of turned elements were performed using an optical profilometer. The non-toxic coolant with zinc aspartate used in the tests resulted in the formation of surface layers enriched with zinc compounds, which directly translated into the improvement of technological quality of the workpiece.
W artykule przedstawiono wyniki badań zużycia narzędzi skrawających po procesie toczenia poprzecznego ze smarowaniem cieczami obróbkowymi. Badania wykonano na tokarce sterowanej numerycznie z zastosowaniem dwóch cieczy chłodząco-smarujących na bazie oleju mineralnego oraz zawierającej asparaginian cynku. Po obróbce zmierzono zużycie narzędzi za pomocą stereoskopowego mikroskopu inspekcyjnego. Obserwacje morfologii powierzchni i identyfikację pierwiastków przeprowadzono przy użyciu skaningowego mikroskopu elektronowego z analizatorem EDS. Pomiary struktury geometrycznej powierzchni elementów toczonych wykonano profilometrem optycznym. Zastosowane w badaniach nietoksyczne chłodziwo z asparaginianem cynku spowodowało powstanie warstw wierzchnich wzbogaconych w związki cynku, co bezpośrednio przełożyło się na poprawę jakości technologicznej detalu.
Źródło:
Tribologia; 2019, 286, 4; 53-61
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Temperature on the Magneto-Dielectrics Effect of Oil-Based Ferrofluid
Autorzy:
Kúdelčík, J.
Hardoň, Š.
Bury, P.
Timko, M.
Kopčanský, P.
Powiązania:
https://bibliotekanauki.pl/articles/1030417.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.65.Cb
77.22.Gm
77.22.Ch
Opis:
The effect of temperature on the magneto-dielectrics behavior was studied by dielectric spectroscopy in the transformer oil-based ferrofluid with magnetic nanoparticles upon the effect of an external magnetic field. The frequency dependence of complex permittivity and dissipation factor were measured within the frequency range from 1 mHz to 10 kHz at different temperatures by a capacitance method. The dielectrics parameters were measured as a function of the external magnetic field in the range of 0-200 mT, parallel to the direction of the electric field as a function of temperature in the range of 15-35°C. The interaction between magnetic field and magnetic moments of nanoparticles led to the aggregation of magnetic nanoparticles to new structures which had influence on dielectric parameters. The dependence of these parameters at constant magnetic field on angle between the direction of the electric and magnetic fields (anisotropy) has been measured, too.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 483-485
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Study of the Magnetocaloric Effect in Ni(en)(H₂O)₄SO₄·2H₂O - An S = 1 Molecular Magnet with Easy-Plane Anisotropy
Autorzy:
Tarasenko, R.
Orendáčová, A.
Čižmár, E.
Orendáč, M.
Potočňák, I.
Feher, A.
Powiązania:
https://bibliotekanauki.pl/articles/1032138.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.30.Gw
71.70.Ch
Opis:
Magnetocaloric properties of Ni(en)(H₂O)₄SO₄·2H₂O powder were investigated in temperature range from 2 K to 30 K in magnetic fields up to 7 T using isothermal magnetization measurements. The maximum value of the isothermal entropy change in the field 7 T is about 8 J/(kg K), with a refrigerant capacity of 55 J/kg. Temperature dependence of the isothermal entropy change under different magnetic fields is in good agreement with theoretical predictions from crystal electric field parameters.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 904-906
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetism and Crystal Field in PrCuAl₃ and NdCuAl₃
Autorzy:
Novák, P.
Diviš, M.
Powiązania:
https://bibliotekanauki.pl/articles/1032630.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Mb
71.20.Lp
71.70.Ch
Opis:
During the last five years we developed method to calculate crystal field and magnetism of rare-earth ions in solids. The method is fully ab initio with the exception of a single parameter which adjust the position of f states relative to other valence states and it was successfully applied in insulating systems. In this contribution the method is used to explain multiplet splitting and magnetism in PrCuAl₃ and NdCuAl₃ intermetallics. For the Nd compound the agreement between theory and experiment is good, while for the PrCuAl₃ the agreement is less satisfactory which can be due to the more delocalized 4f electrons of Pr³⁺ comparing to Nd³⁺ ion.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 964-966
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electric relaxation in Nb₆VSb₃O₂₅-ceramics
Autorzy:
Groń, T.
Filipek, E.
Piz, M.
Kukuła, Z.
Pawlus, S.
Powiązania:
https://bibliotekanauki.pl/articles/1070621.pdf
Data publikacji:
2016-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.Ch
77.22.Gm
77.84.Bw
Opis:
Broadband dielectric spectroscopy measurements of Nb₆VSb₃O₂₅ showed that in both the real (ε') and imaginary (ε'') components of permittivity there is visible relaxation process strongly obscured by dc conductivity. Application of the electric modulus representation of the data enables to study temperature evolution of this relaxation together with conductivity relaxation. It was showed that the activation energies for both processes are close. Low-frequency loss tangent increases strongly with temperature, suggesting that in the compound under study additional energy losses are associated with the conduction of electric current, as determined by the Joule-Lenz law.
Źródło:
Acta Physica Polonica A; 2016, 129, 3; 355-358
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polymer-oxide composites: toward new optical materials
Autorzy:
Nedilko, S.
Powiązania:
https://bibliotekanauki.pl/articles/1052642.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.Ch
78.55.-m
78.66.Sq
Opis:
Brief summary concerning properties of the polymer matrix incorporated with inorganic, e.g. oxide particles, micro/nanocomposites and opportunity to use these composites as optical materials for modern optics and optoelectronic devices is presented in the work. Structure and morphology of the several sets of the new polymer micro/nanocomposites based on the microcrystalline cellulose incorporated with micro/nanoparticle of various oxides (NaNO₂, La_{1-x}Sm_{x}VO₄, La_{1-x}Eu_{x}VO₄ and K₂Eu(PO₄)(MoO₄)), were prepared by "dry" and "wet" cool pressing procedure. Morphology of these composites was described as ensemble of cellulose plates and located gains of the oxide particles. Temperature dependences of complex dielectric permittivity and luminescence properties of the composites were studied. Temperature and electromagnetic field frequency dependences of the dielectric permittivity revealed influence of oxide particles on the characteristics of the microcrystalline cellulose. Both wide band (matrix emission) and narrow lines (RE ions emission) of visible luminescence (350-750 nm range) of the composites is excited in the range 250-550 nm. The luminescence characteristics displayed effect of cellulose on the electronic system of the Sm³⁺ and Eu³⁺ ions and effect of oxide particles on the cellulose matrix was shown, too. Spectral characteristics and high intensity of luminescence showed perspectives of studied composites to be used as light converters in LED and elsewhere as optics luminescent materials.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 829-837
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic domain structure and magnetically-induced reorientation in Ni-Mn-Ga magnetic shape memory alloy
Autorzy:
Heczko, O.
Bradshaw, V.
Powiązania:
https://bibliotekanauki.pl/articles/1053119.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Cc
75.60.Ch
75.80.+q
Opis:
Magnetization process during magnetically induced reorientation and related magnetic domains of cuboid Ni_{50}Mn_{28.5}Ga_{21.5} single crystal with {100} faces was investigated. Magnetic domains were visualized using magneto-optical indicator. The domains pattern is determined by strong uniaxial magnetic anisotropy of Ni-Mn-Ga martensite. Thanks to magnetically induced reorientation the domains arrangements for all three crystal orientations could be obtained and we showed that the size of domains scales with square root of the thickness and penetrates through whole crystal. Visualization of magnetic domains on all faces of cuboid provides the 3D model of magnetic domains.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1063-1065
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of the Optical and EPR Spectra for $Cr^{3+}$ Ions in Diammonium Hexaaqua Magnesium Sulphate Single Crystal
Autorzy:
Wei, Q.
Powiązania:
https://bibliotekanauki.pl/articles/1535818.pdf
Data publikacji:
2010-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Fc
71.70.Ch
71.55.Ht
Opis:
The relations between spin-Hamiltonian parameters and local structure around $Cr^{3+}$ in diammonium hexaaqua magnesium sulphate single crystal were established. On the basis of this, the spin-Hamiltonian parameters, optical spectra and the local structure were investigated successfully. The calculated results are in good agreement with experimental data. This shows that the distortion model adopted in this paper is reasonable.
Źródło:
Acta Physica Polonica A; 2010, 118, 4; 670-672
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical Control of Magnetic States
Autorzy:
Barnaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/1536525.pdf
Data publikacji:
2010-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.70.Cn
72.25.-b
Opis:
Charge and spin transport in artificial magnetic structures, like nanopillar spin valves, planar tunnel junctions, and mesoscopic double-barrier junctions (single-electron transistors) are briefly surveyed, with particular emphasis on magnetoresistance effects and current-induced magnetic switching and spin dynamics. The methods of spin current generation are also discussed, particularly the method based on spin Hall effect.
Źródło:
Acta Physica Polonica A; 2010, 118, 2; 199-203
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prenematic Self-Assembling of Mesogenic Molecules in Isotropic Liquid and Orientational Order in Nematic Phase
Autorzy:
Wolarz, E.
Bauman, D.
Jadżyn, J.
Dąbrowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1493609.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Df
61.30.Gd
77.22.Ch
Opis:
Dielectric relaxation study of nematogenic 4-n-alkyl-4'-cyanobiphenyls (nCB, n = 5, 6), 4-(trans-4'-n-alkylcyclohexyl)isothiocyanatobenzenes (nCHBT, n = 6, 8), 4-cyanophenyl-4'-n-alkylbenzoates (nCPB, n = 6, 8), 4-cyano-3-fluorophenyl-4'-n-octyloxybenzoate (8OCFPB), and 4-cyanophenyl-4'-n-octyloxy-3'-fluorobenzoate (8OCPFB) was performed in the frequency range from 50 kHz to 100 MHz in the nematic and isotropic phases. The static permittivity and the relaxation process related to the rotation of molecules around their short axis was analyzed. For some of these liquid crystals anomalous temperature dependence of static permittivity in the pretransitional region of the isotropic phase was observed. Based on the Meier-Saupe-Martin model of molecular diffusion in nematics, the orientational order parameter 〈$P_2$〉 was determined from dielectric relaxation times and retardation factor. The values of 〈$P_2$〉 calculated from the dielectric relaxation data were compared with the results obtained from measurements of polarized electronic absorption. Correlations between the magnitude of the dielectric pretransitional effect and the orientational order in the nematic phase were discussed.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 447-454
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diffraction from $WS_2$ and MoS_2 Nanotubes
Autorzy:
Damnjanović, M.
Vuković, T.
Milošević, I.
Powiązania:
https://bibliotekanauki.pl/articles/1503023.pdf
Data publikacji:
2011-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.Km
78.67.Ch
68.37.Yz
Opis:
We present a symmetry based analysis of diffraction intensities of transition metal dichalcogenide nanotubes. Obtained results point out specific features of the intensity distribution that are related to group parameters. It is possible to read out all the group parameters from diffraction patterns, and therefore to characterize nanotube, since symmetry group uniquely determines the chiralty indices.
Źródło:
Acta Physica Polonica A; 2011, 120, 2; 224-226
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Off-Diagonal Magnetoimpedance Dependence of Magnetostriction and Anisotropy in Co-Based and Fe-Based Amorphous Ribbons
Autorzy:
Sánchez, T.
García, J.
Santos, J.
Escoda, Ll.
Prida, V.
Sánchez, M.
Suñol, J.
Hernando, B.
Powiązania:
https://bibliotekanauki.pl/articles/1507012.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.50.Kj
75.60.Ch
Opis:
The object of this work is the comparison of domain structure and off-diagonal magnetoimpedance effect in amorphous ribbons with different magnetostriction coefficient. The $Co_{66}Fe_4Ni_1Si_{15}B_{14}$ and $Fe_{80}B_{20}$ samples were obtained by melt-spinning. During the quenching procedure a 0.07 T transverse magnetic field was applied to some of the samples. Domain patterns obtained by the Bitter technique confirm that the differences on the samples are related to the different anisotropy and magnetostriction coefficient, and the quenching procedure. Small changes on the anisotropy distribution and the magnetostriction coefficient can be detected by the off-diagonal impedance spectra as a consequence of the different permeability values of the samples.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 756-758
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Study between Energy Levels of $Cr^{3+}$ and $Co^{2+}$ Ions Doped in $MgF_{2}$ Crystal
Autorzy:
Nistora, R.
Andreici, L.
Avram, N.
Powiązania:
https://bibliotekanauki.pl/articles/1791222.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ch
42.70.Hj
61.72.S-
Opis:
The aim of this paper is to present a comparison of the energy level schemes of $Cr^{3+}$ ($3d^{3}$ electrons) and $Co^{2+}$ ($3d^{7}$ electrons), each of ions doped, separately, in $MgF_{2}$ crystal. We report on the detailed and consistent crystal field analysis of $Cr^{3+}$ spectra in $MgF_{2}$ crystal and compare with results, previously obtained, for $Co^{2+}$, doped in same host matrix. The results are based on application of the exchange charge model of crystal field to the calculation of crystal field parameters and energy levels of both ions doped in $MgF_{2}$.The calculations have been performed on previously optimized geometry of $MgF_{2}$ crystal. The obtained results are compared with experimental data and discussed.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 538-540
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and Theoretical Study of Stripe Magnetic Domain Structure Drift in Iron Garnet Crystals
Autorzy:
Pamyatnykh, L.
Shmatov, G.
Pamyatnykh, S.
Lysov, M.
Mekhonoshin, D.
Druzhinin, A.
Powiązania:
https://bibliotekanauki.pl/articles/1385719.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Mg
75.78.Fg
75.60.Ch
Opis:
The results of experimental and theoretical study of magnetic domain structure drift in low frequency oscillating magnetic field oriented perpendicular to the sample plate are presented. Experimental study was performed on uniaxial iron garnet (TbErGd)₃(FeAl)₅O₁₂ (111) plate with rhombic anisotropy for the case when orientation of domain walls of stripe domains is preserved. Dynamic domain structure was revealed by means of magnetooptic Faraday effect and registered by high speed digital camera at the speed equal to 1200 fps. Theoretical model based on the motion equations for coupled harmonic oscillators that takes into account attenuation and field inhomogeneity along the plate is proposed.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 388-390
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Micromagnetic Structures near a Second Order Phase Transition in Monocrystalline Ferrite Garnet Plates
Autorzy:
Pamyatnykh, L.
Belskii, I.
Shmatov, G.
Powiązania:
https://bibliotekanauki.pl/articles/1386324.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.30.Kz
75.60.Jk
Opis:
The main parameters of micromagnetic structure formation in a vicinity of a second order phase transition were determined experimentally and theoretically. The theoretical study was performed using micromagnetic approach. External magnetic field $H_{c}$ of appearance of micromagnetic structure and micromagnetic structure period $L_{c}$ were determined for (001)-oriented plate with uniaxial $K_{u}$ and cubic K₁ magnetic anisotropy. The plate was saturated by the field applied in its plane. In the model we assumed that magnetization vector undergoes small deviations from equilibrium if magnetic field is slightly reduced. These deviations are periodic in nature: micromagnetic structure has a form of a plane wave. Dependences of $H_{c}$ and $L_{c}$ on an azimuthal angle of external magnetic field and on anisotropy constants $K_{u}$ and K₁ were derived analytically in this work. Experimental studies of micromagnetic structure near the second order phase transition were conducted on (EuEr)₃(FeGa)₅O₁₂ (001)-oriented 50 μm thick ferrite-garnet plate with $K_{u}$ = 5700 erg/cm³ and K₁=-3700 erg/cm³. Micromagnetic structure was revealed by means of magnetooptic Faraday effect. The in-plane field was increased up to 2000 Oe. Experimentally determined values of $H_{c}$ and $L_{c}$ were compared with theoretical estimates.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 421-423
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex Permeability After-Effect and Analysis of Power Losses in Ferromagnetic Co-Based Amorphous Alloy
Autorzy:
Kravčák, J.
Varga, R.
Vojtaník, P.
Powiązania:
https://bibliotekanauki.pl/articles/1813518.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Gb
75.60.Ch
75.60.Lr
Opis:
Complex permeability $(μ=μ_1-iμ_2)$ after-effect of near-zero magnetostrictive CoFeCrSiB amorphous alloy was investigated in magnetic field H (t)= $H_0$ exp ( i 2π f t) after demagnetization. For frequencies f from 200 Hz to 2000 Hz and for the small amplitude H_0 < $H_{cr}$ we observed practically constant both real $μ_1$ and imaginary part $μ_2$ of permeability. A measured small decrease in the real part $μ_1$ and increase in the imaginary part $μ_2$ with frequency f were theoretically calculated for a quadratic form of a domain wall potential $E_S$ (x)=1/2α $x^2$. The calculated loss factortan δ = $μ_2 μ_1$, which is small at amplitude $H_0$ < $H_{cr}$, corresponds to power losses due to eddy currents induced around reversibly moving domain walls.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 43-46
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Dependent Phenomena in Magnetoelectronic Devices
Autorzy:
BarnaŚ, J.
Gmitra, M.
Rudziński, W.
Wawrzyniak, M.
Dugaev, V.
Kunert, H.
Powiązania:
https://bibliotekanauki.pl/articles/1814031.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.70.Cn
75.70.Pa
Opis:
Spin effects in electronic transport properties of artificial magnetic structures, like nanopillar spin valves, tunnel junctions, mesoscopic double-barrier junctions (single-electron transistors) are briefly discussed. Two classes of spin effects are distinguished; i.e. magnetoresistance phenomena due to magnetization rotation, and current-induced magnetic switching and magnetic dynamics.
Źródło:
Acta Physica Polonica A; 2007, 112, 6; 1259-1265
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Angular Distortion around $Cr^{3+}$ Ions Doped Diammonium Hexaaqua Magnesium Sulphate Single Crystal
Autorzy:
Ciresan, M.
Vaida, M.
Avram, N.
Powiązania:
https://bibliotekanauki.pl/articles/1815473.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Dg
76.30.-v
71.70.Ch
Opis:
The aim of the present study is to explain the local distortion around $Cr^{3+}$ ions doped in the title crystal using the latest experimental data regarding optical and EPR spectra. We calculated $g_ǁ$, $g_⊥$, and D spin-Hamiltonian parameter as function of angle between the $C_3$ axis and metal-ligand chemical bond in local distorted octahedral cluster $[CrO_6]^{9-}$ formed after doped crystal. The method is based on the single spin-orbit coupling parameter model, in the cluster approach using Macfarlane high order perturbation formulae. The results compared with experimental data give a reasonable agreement.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 835-839
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific Heat of Cr-Based Semimagnetic Semiconductors
Autorzy:
Twardowski, A.
Eggenkamp, P.
Mac, W.
Swagten, H. J. M.
Demianiuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1929660.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
71.70.Ch
71.70.Ej
Opis:
Specific heat of ZnCrSe and ZnCrS was measured for 1.5 < T < 10 K and B < 3 T. The data were interpreted using "crystal field model" taking into account tetrahedral crystal field, tetragonal Jahn-Teller distortion and spin-orbit interaction.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 563-565
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
d and f Electrons in a qp-Quantized Cubical Field
Autorzy:
Kibler, M.
Sztucki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929778.pdf
Data publikacji:
1993-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ch
03.65.-w
02.20.-a
Opis:
A procedure for qp-quantizing a crystal-field potential V with an arbitrary symmetry G is developed. Such a procedure is applied to the case where V involves cubic components (G = 0) of the degrees 4 and 6. This case corresponds to d and f electrons in a qp-quantized cubical potential. It is shown that the qp-quantization of the considered cubical potential is equivalent to a symmetry breaking of type O → D$\text{}_{4}$. A general conjecture about this symmetry breaking phenomenon is given.
Źródło:
Acta Physica Polonica A; 1993, 84, 5; 857-866
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chaotic Dynamics of Domain Walls in Magnetic Garnet Films with In-Plane Fields
Autorzy:
Sukiennicki, A.
Kosiński, R. A.
Powiązania:
https://bibliotekanauki.pl/articles/1933423.pdf
Data publikacji:
1995-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.+b
75.10.Hk
75.60.Ch
Opis:
Chaotic dynamics and routes to chaos of domain walls in magnetic bubble garnet materials in the presence of in-plane fields were investigated numerically using Slonczewski's equations of motion. Connection between the structure of the wall and the character of the attractor was found. The in-plane field can play a role of the factor controlling chaos.
Źródło:
Acta Physica Polonica A; 1995, 87, 6; 933-938
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coercivity of Ultrathin Magnetic Films with Perpendicular Anisotropy
Autorzy:
Zablotskii, V.
Kisielewski, M.
Tsiganenko, O.
Ferre, J.
Powiązania:
https://bibliotekanauki.pl/articles/2013072.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.-d
75.60.Ch
75.70.Ak
Opis:
The calculation of the temperature dependence of the domain wall coercivity of ultrathin magnetic films with perpendicular anisotropy is reported. In this case, the magnetization reversal is supposed to occur through domain wall motion. The proposed model takes into account thermal bending fluctuations of the domain wall, which is pinned by crystal defects such as grain boundaries. A fitting procedure, applied to recently published experimental data on the field induced domain wall velocity in Au/Co films, allows us to find out realistic values of the involved parameters.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 471-474
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
STM Imaging of Magnetic Dots with Ferromagnetic Tip
Autorzy:
Wawro, A.
Kasuya, A.
Powiązania:
https://bibliotekanauki.pl/articles/2013217.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Nz
36.40.Cg
61.16.Ch
Opis:
We report on imaging of isolated, few nanometers in size, magnetic dots (Co, Ni) by the use of a scanning tunneling microscope equipped with a ferromagnetic Co tip in the presence of external magnetic field. The dependence of apparent height of dots as a function of magnetic field takes a hysteresis-like shape. We discuss possible mechanisms of the scanning tunneling microscope tip interactions with dots.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 547-550
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Fluid-Like and Critical Behavior of the Isotropic-Nematic Transition Appearing in Linear and Non-linear Dielectric Studies
Autorzy:
Drozd-Rzoska, A.
Rzoska, S. J.
Zioło, J.
Powiązania:
https://bibliotekanauki.pl/articles/2014495.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Md
64.30.+t
77.22.Ch
Opis:
A short review of literature and the authors' experimental results for the pretransitional behavior in the isotropic phase of nematogens is given. The paper also presents new results of non-linear dielectric effect and dielectric permittivity measurements in the broad temperature range. Results obtained show significant advantages of non-linear dielectric effect and dielectric permittivity for studying pretransitional properties in liquid crystalline materials. The paper contains a comprehensive comparison of the experiment with predictions of the mean-field model and the fluid-like description. The presented analysis strongly supports the image of the isotropic phase as a complex liquid resulting from vicinity of the fluid-like, "nematic-isotropic", critical point.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 637-643
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scanning Tunneling Spectra and Low Energy Ion Scattering Studies of the Verwey Transition in MBE Fe$\text{}_{3}$O$\text{}_{4}$ (100) Thin Film
Autorzy:
Kim-Ngan, N.-T. H.
Soszka, W.
Hietschold, M.
Powiązania:
https://bibliotekanauki.pl/articles/2024029.pdf
Data publikacji:
2001-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
61.18.Bn
71.30.+h
Opis:
The (100) surface of magnetite Fe$\text{}_{3}$O$\text{}_{4}$ thin film was studied by a UHV low-temperature scanning tunneling microscope and by an ion scattering spectroscopy. The tunneling spectra revealed a widening of the gap with decreasing temperature, which may be related to the metal-insulator phase transition in this material. A strong effect of this phase transition on ion scattering from such a surface was observed. The temperature dependence of the scattered ion yield, R$\text{}^{+}$(T), revealed two minima at around 100 K and at 125 K under Ne$\text{}^{+}$ bombardment with the primary energy up to 6 keV. The disappearance of the high-temperature minimum at a bombarding energy of 6.5 keV gave a further evidence for the ion velocity dependence of the character of the R$\text{}^{+}$(T) curve, which has been first observed for a MBE Fe$\text{}_{3}$O$\text{}_{4}$ (111) film surface.
Źródło:
Acta Physica Polonica A; 2001, 99, 2; 267-276
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photostriction of CdF$\text{}_{2}$:In Crystals
Autorzy:
Suchocki, A.
Raułuszkiewicz, J.
Langer, J. M.
Koziarska-Glinka, B.
Powiązania:
https://bibliotekanauki.pl/articles/1968426.pdf
Data publikacji:
1997-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
61.72.Hh
74.62.Dh
Opis:
Lattice relaxation accompanying phototransformation of In bistable centers from the ground, deep state to the shallow state in CdF$\text{}_{2}$ crystal has been measured with the use of scanning tunnelling microscope. It is shown that relatively small macroscopic changes of the crystal length in the order of 1.8×10$\text{}^{-6}$ accompany the phototransformation of In ions. Lattice expansion upon the influence of population of shallow donor levels in CdF$\text{}_{2}$ explains the observed small changes of lattice constant during the process.
Źródło:
Acta Physica Polonica A; 1997, 92, 5; 1005-1008
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Theoretical Analysis of Ballistic Electron Emission Microscopy: Band Structure Effects and Attenuation Lengths
Autorzy:
de Andres, P. L.
Reuter, K.
Garcia-Vidal, F. J.
Flores, F.
Hohenester, U.
Kocevar, P.
Powiązania:
https://bibliotekanauki.pl/articles/1968707.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
72.10.Bg
73.20.At
Opis:
Using a quantum mechanical approach, we compute the ballistic electron emission microscopy current distribution in reciprocal space to compare experimental and theoretical spectroscopic I(V) curves. In the elastic limit, this formalism is a "parameter-free" representation of the problem. At low voltages, low temperatures, and for thin metallic layers, the elastic approximation is enough to explain the experiments (ballistic conditions). At low temperatures, inelastic effects can be taken into account approximately by introducing an effective electron-electron lifetime as an imaginary part in the energy. Ensemble Monte Carlo calculations were also performed to obtain ballistic electron emission microscopy currents in good agreement with the previous approach.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 281-287
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scanning Tunneling Microscopy of Ordered Organic Monolayer Films on Si(001)
Autorzy:
Hamers, R. J.
Hovis, J.
Liu, H.
Powiązania:
https://bibliotekanauki.pl/articles/1968711.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
34.50.Dy
68.55.-a
Opis:
Scanning tunneling microscopy and optical spectroscopy techniques have been utilized to investigate the formation of ordered organic monolayer films on the (001) face of silicon. Cyclopentene and 1,5-cyclooctadiene both produce monolayer films that are ordered translationally and rotationally. The rotational orientations of the molecules arise from the directional interaction of the π orbitals of the starting alkene with the π orbital of the dimers comprising the reconstructed Si(001) surface, with the Si(001) surface acting as a template for determining the directionality of molecules in the subsequent organic film. Using single-domain Si(001) samples, it is shown that the molecular films also exhibit anisotropy in optical properties when measured on centimeter length scales.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 289-295
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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