Temat: spin - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Spin hydrodynamics : recent developments
Autorzy:: Bhadury, Samapan
Florkowski, Wojciech
Drogosz, Zbigniew
Mykhaylova, Valeriya
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Pseudogauge freedom and the SO(3) algebra of spin operators
Autorzy:: Florkowski, Wojciech
Ryblewski, Radoslaw
Dey, Sourav
Jaiswal, Amaresh
Opis:: The energy-momentum and spin tensors for a given theory can be replaced by alternative expressions that obey the same conservation laws for the energy, linear momentum, as well as angular momentum but, however, differ by the local redistribution of such quantities (with global energy, linear momentum, and angular momentum remaining unchanged). This arbitrariness is described in recent literature as the pseudogauge freedom or symmetry. In this letter, we analyze several pseudogauges used to formulate the relativistic hydrodynamics of particles with spin and conclude that the canonical version of the spin tensor has an advantage over other forms as only the canonical definition defines the spin operators that fulfill the SO(3) algebra of angular momentum. This result sheds new light on the results encountered in recent papers demonstrating pseudogauge dependence of various physical quantities. It indicates that for spin-polarization observables, the canonical version is fundamentally better suited for building a connection between theory and experiment.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Akademicki spin off : Wiedza, zasoby i ścieżki rozwoju
Autorzy:: Głodek, Paweł
Tematy:: Zarządzanie projektami; Pokaż więcej
Wydawca:: Łódź : Wydawnictwo Uniwersytetu Łódzkiego
Dostawca treści:: IBUK Libra

Książka

na półce

Skocz do pozycji: 4.

Tytuł:: Analysis of an aircraft departure and spin characteristics using Nash equilibrium theory
Autorzy:: Yan, Chao
Tu, Lianghui
Yang, Yang
Wang, Yuhao
Tematy:: departure characteristics
spin characteristics
spin equilibrium point; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/59114477.pdf Link otwiera się w nowym oknie
Opis:: The departure characteristics and steady-spin characteristics of a training aircraft are analyzed. The sideslip departure characteristics of the aircraft under the maximum weight and the minimum weight are obtained, respectively. When predicting the steady-spin, the equilibrium point of the spin is found by an analytic-graphic method based on “Nash equilibrium theory”, and the steady-spin parameters of this aircraft are obtained under the conditions of maximum weight and minimum weight, left spin and right spin, neutral controls and prospin controls. The simulation results have good theoretical significance for the optimization and improvement of the aircraft in the preliminary design stage.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Why does Poland need "spin-offs"?
Dlaczego Polsce są potrzebne "spin-offs"?
Autorzy:: Szopa, Anna
Wydawca:: Wydawnictwo Uniwersytetu Jagiellońskiego
Opis:: Niniejszy artykuł opisuje fenomen uniwersyteckich "spin-off" i ich znaczenie dla procesu innowacji. Jego celem jest przedstawienie roli przedsiębiorstw typu "spin-off" w rozwoju gospodarczym regionów ich istoty w rozwoju Polski. Autorka przytacza przykład Doliny Krzemowej jako dobrej praktyki rozwoju regionalnego.
This paper strives to understand spin-offs phenomenon whereby a new companies play a key role in innovation process. The objective is to present their role in economic growth, knowledge transfer, universities activities development and other factors that might be considered as a new inner strength for Poland. To give a brief overview of spin-off activity Silicon Valley area- home to many of the world’s largest technology companies is described.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Spin hydrodynamics
Autorzy:: Florkowski, Wojciech
Opis:: The concept of spin hydrodynamics is reexamined and briefly characterized.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: Reflection of surface spin waves from the interface of uniaxial and biaxial ferromagnets in a planar magnetic field
Autorzy:: Reshetnyak, S. O.
Nastenko, M. Y.
Berezhinsky, A. S.
Tematy:: surface spin waves
ferromagnetic medium
spin pinning
reflection; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/412236.pdf Link otwiera się w nowym oknie
Opis:: The article investigates the process of reflection of surface spin waves passing through the interface of uniaxial and biaxial ferromagnets in a planar external magnetic field directed along the hard axis of ferromagnet. The problem is solved using the spin density formalism and the Landau-Lifshitz equations for the case of the absence of dissipation in the system. Geometrical optics formalism is used to describe the processes of refraction of surface spin waves propagating in the ferromagnetic medium with non uniform distribution of magnetic parameters. Quantum mechanical approach is used for calculation of the amplitudes of reflected and transmitted waves. It is shown that spin wave birefringence phenomenon appears at the interface of two uniform ferromagnetic components. Frequency and field dependencies of reflection coefficients for different branches of spin waves are obtained in the study. It is shown that it is possible to change the “optical” parameters of the system by only changing a magnitude of the external homogeneous magnetic field. It is also shown that reflection amplitude depends heavily on the angle of incidence.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 8.

Tytuł:: Search for canted spin arrangement in Er2-xTbxFe14B with Mössbauer spectroscopy
Autorzy:: Kurzydło, P. M.
Bogacz, B. F.
Pędziwiatr, A. T.
Oleszak, D.
Przewoźnik, J.
Tematy:: Mössbauer effect
permanent magnet materials
spin diagrams
spin reorientation; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/147036.pdf Link otwiera się w nowym oknie
Opis:: The materials studied were polycrystalline compounds Er2-xTbxFe14B (x = 0.1, 0.2, 0.3, 0.4) which crystallize in a tetragonal lattice and display a variety of spin arrangements. The compounds have been measured with 57Fe Mössbauer spectroscopy over the temperature range 80–320 K in order to investigate the spin reorientation processes. Each compound was studied in a wide temperature range, with precise Mössbauer scanning in the vicinity of the transition. The set of spectra obtained for a given compound was analyzed using simultaneous fi tting procedure to investigate the infl uence of the transition on the shape of the spectra. The fi tting program was specifi ed to analyze the transition according to the ‘two state model’: spins fl ip abruptly from initial angle to fi nal arrangement (90° angle). Obtained results suggest that spin reorientation process cannot be described using only the mentioned above model. Additional computer simulations based on the Yamada–Kato model were conducted to determine temperature range and the type of spin alignments in the vicinity of the transition. These theoretical results supported by spectra analysis suggest the existence of intermediate (canted) spin arrangements in the studied compounds. The spin arrangement diagram was constructed.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: Spin reorientation process in Tm2–xHoxFe14B : analysis of conical arrangement based on Mössbauer spectra
Autorzy:: Kurzydło, P. M.
Pędziwiatr, A. T.
Bogacz, B. F.
Przewoźnik, J.
Oleszak, D.
Tematy:: permanent magnetic materials
Mössbauer effect
spin reorientation
spin diagrams; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148120.pdf Link otwiera się w nowym oknie
Opis:: The spin reorientation process in the Tm2–xHoxFe14B series of compounds was studied using 57Fe Mössbauer spectroscopy over the temperature range 5.2–320 K with a focus on the analysis of conical spin arrangement. Each compound was studied by precise Mössbauer scanning in the vicinity of the transition and during the transition. By applying computer simulations based on the simplified Yamada-Kato model, as well as on some literature data for R2Fe14B (R = Tm, Ho) compounds, the above series was selected for studies as it contains compounds with different spin arrangements (axial, planar, conical). It was a crucial requirement for obtaining unambiguous angular dependences when applying a simultaneous fitting procedure of Mössbauer spectra. Such an extended procedure was applied which allowed the temperature dependence of the angle describing the position of the magnetization vector to be obtained. The results were compared with those from theoretical simulations. The spin arrangement diagram was constructed. A conical spin arrangement was confirmed over a wide temperature range.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 10.

Tytuł:: Spin arrangement diagrams for Er2-xRxFe14B (R = Y, Ce) obtained with Mössbauer spectroscopy and phenomenological model
Autorzy:: Pędziwiatr, A.
Bogacz, B.
Gargula, R.
Tematy:: Mössbauer effect
permanent magnet materials
spin diagrams
spin reorientation; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148797.pdf Link otwiera się w nowym oknie
Opis:: Two isostructural series of polycrystalline compounds: Er2-xYxFe14B and Er2-xCexFe14B have been studied by 57Fe Mössbauer spectroscopy in the temperature range 80-370 K. The spin reorientation phenomenon (a transition from basal plane to axial easy magnetisation direction) has been studied extensively by a narrow step temperature scanning in the vicinity of the transition. Using the procedure of subtracting the Mössbauer spectra taken for the same compound at different temperatures, it was possible to follow the influence of transition on the shape of spectra. From this procedure it was concluded that in the region of transition each subspectrum splits into two Zeeman sextets, which are characterised by different hyperfine magnetic fields and quadrupole splittings. The consistent way of describing the Mössbauer spectra was proposed. The spin reorientation temperatures have been established for all compositions and compared with the values obtained from theoretical calculations of spin orientation angle based on phenomenological model. The spin arrangement diagrams have been constructed.
Dostawca treści:: Biblioteka Nauki

Artykuł

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