Temat: crystal field - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Localized f electron aspect in heavy-germion intermetallic YbRh₂Si₂
Autorzy:: Radwanski, R.
Nalecz, D.
Fedyk, S.
Ropka, Z.
Powiązania:: https://bibliotekanauki.pl/articles/1048149.pdf
Data publikacji:: 2018-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: Heavy fermion
crystal field
Kondo resonance
YbRh₂Si₂
Opis:: We point out that there is more and more experiments showing the almost perfect localization of thirteen f-electrons in the canonical heavy-fermion system: YbRh₂Si₂. The revealing of the Yb³⁺ crystal-field (CEF) states confirms the Quantum Atomistic Solid State Theory. QUASST was the only theory, which has claimed from 1992 the existence of the discrete CEF electronic structure and the Kramers doublet ground state in heavy-fermion intermetallics. The removal of the on-site Kramers degeneracy via spin-dependent interactions is origin of the large specific heat at low temperatures (a hallmark of the heavy-fermion phenomena) and of low-energy neutral spin-like excitations. The Kondo resonance is related to the slight splitting of the Kramers doublet ground state of the Yb³⁺ ion.
Źródło:: Acta Physica Polonica A; 2018, 133, 3; 387-390
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Crystal electric field parameters determination for R2Fe14B compounds based on Yamada - Kato model
Autorzy:: Bogacz, B. F.
Pędziwiatr, A. T.
Powiązania:: https://bibliotekanauki.pl/articles/147342.pdf
Data publikacji:: 2013
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: crystal electric field parameters
model Yamada-Kato
Mössbauer effect
permanent magnet materials
spin reorientation
Opis:: Semi-empirical model developed by Yamada-Kato enables calculation of magnetic spin directions for R2Fe14B compounds, based on minimization of free energy, and - in further steps - determination of spin reorientation temperatures for transitions from basal plane to axial easy magnetization direction. In our study, this model has been successfully used to determine crystal field and exchange field parameters for Er2-xCexFe14B compounds based on spin reorientation temperatures obtained experimentally from Mössbauer measurements.
Źródło:: Nukleonika; 2013, 58, 1; 31-33
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: EMR-related problems at the interface between the crystal field Hamiltonians and the zero-field splitting Hamiltonians
Autorzy:: Rudowicz, Cz.
Karbowiak, M.
Powiązania:: https://bibliotekanauki.pl/articles/971531.pdf
Data publikacji:: 2015
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: crystal/ligand field (CF/LF) Hamiltonian electron magnetic resonance (EMR)
magnetism
optical spectroscopy
transition (3dN and 4fN) ions
zero-field splitting (ZFS)
Opis:: The interface between optical spectroscopy, electron magnetic resonance (EMR), and magnetism of transition ions forms the intricate web of interrelated notions. Major notions are the physical Hamiltonians, which include the crystal field (CF) (or equivalently ligand field (LF)) Hamiltonians, and the effective spin Hamiltonians (SH), which include the zero-fi eld splitting (ZFS) Hamiltonians as well as to a certain extent also the notion of magnetic anisotropy (MA). Survey of recent literature has revealed that this interface, denoted CF (LF) ↔ SH (ZFS), has become dangerously entangled over the years. The same notion is referred to by three names that are not synonymous: CF (LF), SH (ZFS), and MA. In view of the strong need for systematization of nomenclature aimed at bringing order to the multitude of different Hamiltonians and the associated quantities, we have embarked on this systematization. In this article, we do an overview of our efforts aimed at providing a deeper understanding of the major intricacies occurring at the CF (LF) ↔ SH (ZFS) interface with the focus on the EMR-related problems for transition ions.
Źródło:: Nukleonika; 2015, 60, No. 3, part 1; 377-383
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Simple method for characterization of photonic crystal fibers
Autorzy:: Szustakowski, M.
Pałka, N.
Grabiec, W.
Powiązania:: https://bibliotekanauki.pl/articles/308773.pdf
Data publikacji:: 2007
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: photonic crystal fibers
far field distribution
characterization
Opis:: We report on our experimental characterization of index-guiding photonic crystal fibers (PCF) from their far field intensity distribution. The algorithm presented below makes it possible to determine the geometrical parameters of the PCF (core diameter, air hole spacing and air hole diameter) from its far field pattern. We obtained good agreement with the manufacturer's data for all fibers tested.
Źródło:: Journal of Telecommunications and Information Technology; 2007, 2; 109-113
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Equation of the magnetic field distribution of dynamo sheets taking into account crystallographic structure
Autorzy:: Mazgaj, Witold
Szular, Zbigniew
Sierżęga, Michał
Szczurek, Paweł
Powiązania:: https://bibliotekanauki.pl/articles/140486.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: crystallographic texture
dynamo steel sheet
iron crystal
magnetic anisotropy
magnetic field
Opis:: The main purpose of the paper is to present a method which allows taking into account the anisotropic properties of dynamo steel sheets. An additional aim is to briefly present anisotropic properties of these sheets which are caused by occurrences of some textures. In order to take into account textures occurring in dynamo sheets, a certain sheet sample is divided into elementary segments. Two matrix equations, describing changes of the magnetic field, are transformed to one non-linear algebraic equation in which the field strength components are unknown. In this transformation the flux densities assigned to individual elementary segments are replaced by functions of flux densities of easy magnetization axes of all textures occurring in the given dynamo sheet. The procedure presented in the paper allows determining one non-linear matrix equation of the magnetic field distribution; in this equation all textures occurring in a dynamo sheet are included. Information about textures occurring in typical dynamo sheets may be used in various approaches regarding the inclusion of anisotropic properties of these sheets, but above all, the presented method can be helpful in calculations of the magnetic field distribution in anisotropic dynamo sheets.
Źródło:: Archives of Electrical Engineering; 2019, 68, 1; 185-194
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Low-loss connection of hybrid fibre optic systems with low sensitivity to wavelength
Autorzy:: Skorupski, K.
Powiązania:: https://bibliotekanauki.pl/articles/220977.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: photonic-crystal fiber
measurement of mode-field diameter
fiber characterization
beam combining
Opis:: This paper proposes a method for adjusting light waves propagating in systems composed of photonic fibers, light sources and detection elements. The paper presents the properties of these connections in terms of the loss of signal transmission. Different fiber core areas were analyzed, and measurements of the mode-field diameters (MFDs) of selected fiber structures are presented. The study analyzed two types of LMA (Large Mode Area) fiber structures, and the mode-field diameters of these structures were measured on the basis of the radiation distribution obtained under near-field conditions. The results are compared to the values obtained for a SMF-28 single-mode fiber. The LMA structures analyzed in the paper are characterized by low sensitivity of the MFD parameter to the length of transmitted waves, which creates the possibility of their use as intermediate fibers when connecting optical fibers of different diameters. In the wavelength range from 800 nm to 1600 nm, a 3.5% MFD change was observed for the first investigated LMA structure, and a 1% change was observed for the second. In addition, measurements of the mode-field diameters were also made using the transverse offset method for comparison of the results.
Źródło:: Metrology and Measurement Systems; 2013, 20, 4; 697-704
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Bandgap properties in locally resonant phononic crystal double panel structures with periodically attached pillars
Autorzy:: Qian, D.
Shi, Z.
Powiązania:: https://bibliotekanauki.pl/articles/280927.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: bandgap property
phononic crystal double panel
band structure
displacement field
transmission power spectrum
Opis:: The locally resonant (LR) phononic crystal double panel structure made of a two-dimensional periodic array of a two-component cylindrical LR pillar connected between the upper and lower plates is proposed, and the bandgap properties of the structure are investigated theoretically in this paper. The band structures, displacement fields of eigenmodes and transmission power spectrums of the corresponding 8×8 finite structure are calculated by the finite element method. Numerical results and further analysis demonstrate that a band gap with a low starting frequency and a wide band width is opened by the coupling between dominant vibrations of the pillars and plate modes of the upper and lower plates when the vibration source and the receiver are considered on different sides of the structure. By comparing the band structures and displacement fields of the double panel and those of the single plate with the same parameters, many common characteristics are displayed. Then, the influence of geometrical parameters on the band gap are studied and understood with the help of a simple ‘spring-mass’ model.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1167-1179
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Fusion splicing: the penalty of increasing the collapse length of the air holes in ESM-12B photonic crystal fibers
Autorzy:: Adnan, S. A.
Abdulwahhab, A. W.
Ismail, S.N.
Powiązania:: https://bibliotekanauki.pl/articles/174083.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: photonic crystal fiber
PCF
collapse length
mode field diameter
MFD
fusion splicing
guiding mechanisms
Opis:: For optimum fusion splicing process of a photonic crystal fiber, the collapsing of the air holes at any photonic crystal fiber is the key point of either increasing or decreasing the total splice loss. In this paper, an experimental study has been carried out to investigate the relation between total splice loss or total fiber attenuation due to splice loss and the length of the collapsed region of the air holes. This is done by splicing ESM-12B photonic crystal fiber between two equal lengths of single mode fibers and measuring the attenuation at different arc times and arc powers. The results showed that the increase in the length of the collapsed air holes region results in higher loss, therefore, higher fiber attenuation.
Źródło:: Optica Applicata; 2016, 46, 2; 265-275
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Evolution of the diffraction pattern during the transition from the near-field toward the far-field region
Autorzy:: Grabka, M.
Pustelny, S.
Wajnchold, B.
Gawlik, W.
Mergo, P.
Powiązania:: https://bibliotekanauki.pl/articles/200137.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: wave optics
diffraction of light
near-field diffraction
microstructured optical fibres
photonic crystal fibers
Opis:: In the paper we experimentally and theoretically analyze diffraction of light propagating through a microstructured optical fiber on the fiber end face. In the measurements the diffracting light is spatially inhomogeneous and the diffracting object is a solid-state core with a triangular shape. Application of optical system enables detailed experimental investigations of evolution diffraction pattern in the near-field region, in particular, rotation of the observed structure while departing from the fiber end. The experimental results are confirmed with theoretical simulations based on the theory of the Fresnel diffraction.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 389-393
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Modeling of dynamics of big size ZnGeP2 crystal growth by vertical Bridgman technique
Autorzy:: Philippov, M.
Babushkin, Y.
Efimov, S.
Zamyatin, S.
Rudnicki, V.
Trofimov, A.
Gribenyukov, A.
Powiązania:: https://bibliotekanauki.pl/articles/202215.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: crystal growth
temperature field
finite elements method
Bridgman technique
wzrost kryształów
pole temperatury
metoda elementów skończonych
metoda Bridgmana
Opis:: The results of a modelling of big size single crystal ZnGeP2 growth dynamics in the multi-zone thermal installation based on the vertical variant of the Bridgman technique are given. Trustworthiness of the results modeling is achieved by means of creation of the mathematical model taking into account the particularities of the installation as well as the changes in installation work volume during crystallization. Temperature field changes during crystal growth by numerical technique were examined. It is demonstrated that growth container moving has a significant impact on temperature field in work volume and crystallization isotherm local position. Thus, the actual crystal growth rate differs from the nominal velocity of growth container moving. The data received as a result of modelling should be taken into account in new equipment designing, crystallization process control system development and crystal growth experiments planning.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 3; 283-290
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Wave Propagation in a LRPC Composite Double Panel Structure with Periodically Attached Pillars and Etched Holes
Autorzy:: Qian, D.
Powiązania:: https://bibliotekanauki.pl/articles/176620.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: locally resonant phononic crystal
composite double panel structure
band structure
displacement field
transmission power spectrum
“base-spring-mass” simplified model
Opis:: The locally resonant phononic crystal (LRPC) composite double panel structure (DPS) made of a twodimensional periodic array of a two-component cylindrical LR pillar connected between the upper and lower composite plates is proposed. The plates are composed of two kinds of materials and periodically etched holes. In order to reveal the bandgap properties of structure theoretically, the band structures, displacement fields of eigenmodes and transmission power spectrums of corresponding 8 × 8 finite structure are calculated and displayed by using finite element method (FEM). Numerical results and further analysis demonstrate that if the excitation and response points are picked on different sides of the structure, a wide band gap with low starting frequency is opened, which can be treated as the coupling between dominant vibrations of pillars and plate modes. In addition, the influences of filled-in rubber, etched hole and viscidity of soft material on band gap are studied and understood with the help of “base-spring-mass” simplified model.
Źródło:: Archives of Acoustics; 2018, 43, 4; 717-725
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Simulation of two dimensional photonic band gaps
Autorzy:: Dissanayake, S. E.
Wijewardena Gamalath, K. A. I. L.
Powiązania:: https://bibliotekanauki.pl/articles/411904.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Photonic crystal
square lattice
triangular lattice
honeycomb lattice
plane wave expansion
mode field distribution
GaAs
dielectric kontrast
filling fraction
gap maps
Opis:: The plane wave expansion method was implemented in modelling and simulating the band structures of two dimensional photonic crystals with square, triangular and honeycomb lattices with circular, square and hexagonal dielectric rods and air holes. Complete band gaps were obtained for square lattice of square GaAs rods and honeycomb lattice of circular and hexagonal GaAs rods as well as triangular lattice of circular and hexagonal air holes in GaAs whereas square lattice of square or circular air holes in a dielectric medium ε = 18 gave complete band gaps. The variation of these band gaps with dielectric contrast and filling factor gave the largest gaps for all configurations for a filling fraction around 0.1.The gap maps presented indicated that TM gaps are more favoured by dielectric rods while TE gaps are favoured by air holes. The geometrical gap maps operating at telecommunication wavelength λ = 1.55 m showed that a complete band gap can be achieved for triangular lattice with circular and hexagonal air holes in GaAs and for honeycomb lattice of circular GaAs rods.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2014, 5; 58-88
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Numerical studies of significance of anchoring strength energy for behaviour of flexoelectric homeotropic nematic layer subjected to dc electric field
Numeryczne badania wpływu energii kotwiczenia na odkształcenia homeotropowej warstwy nematyka fleksoelektrycznego wywołane stałym polem elektrycznym
Autorzy:: Buczkowska, M.
Grzelczak, K.
Powiązania:: https://bibliotekanauki.pl/articles/296512.pdf
Data publikacji:: 2009
Wydawca:: Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
Tematy:: kryształ ciekły nematyczny
siły mocowania
dc (prąd stały) pole elektryczne
deformacje indukowane
nematic liquid crystal
anchoring strength
induced deformations
dc (direct current) electric field
Opis:: Elastic deformations of homeotropic nematic liquid crystal layers subjected to a d.c. electric field were studied numerically. The flexoelectric properties of the nematic material and the presence of ionic space charge were taken into account. The influence of anchoring strength W was investigated. The calculations were performed for layers with negative dielectric anisotropy and negative sum of flexoelectric coefficients. Strongly blocking electrodes were assumed. The threshold voltages for deformations were computed for several anchoring strength values and for low, moderate and high ion content. Its value was nearly proportional to W for low anchoring strength and saturated at some high value of W. The director distributions were also determined. This task was complicated by the presence of space charge of ions. Remarkable change of deformation character was noticed when the ion content and anchoring strength were varied.
Zbadano numerycznie wpływ energii kotwiczenia ciekłego kryształu z podłożem na indukowane stałym polem elektrycznym deformacje homeotropowej warstwy nematyka o ujemnej anizotropii dielektrycznej i ujemnej sumie współczynników fleksoelektrycznych. Przy niskiej zawartości jonów i wysokiej energii kotwiczenia stwierdzono symetryczny rozkład direktora. W miarę wzrostu koncentracji jonów lub obniżania energii kotwiczenia deformacja stawała się asymetryczna. Wyniki pokazują, że jonowy ładunek przestrzenny wpływa znacząco na efektywność oddziaływań powierzchniowych.
Źródło:: Scientific Bulletin. Physics / Technical University of Łódź; 2009, 30; 5-18
1505-1013
2449-982X
Pojawia się w:: Scientific Bulletin. Physics / Technical University of Łódź
Dostawca treści:: Biblioteka Nauki

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