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Wyświetlanie 1-15 z 89
Tytuł:
Counterpropagating Matter Waves in Optical Lattices
Autorzy:
Prvanović, S.
Jović, D.
Jovanović, R.
Strinić, A.
Belić, M.
Powiązania:
https://bibliotekanauki.pl/articles/1791206.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.75.Lm
Opis:
An investigation of Bose-Einstein condensate in two-dimensional optical lattice potentials, formed by laser beams, is carried out. We are interested in the dynamics of Bose-Einstein condensate in a square optical lattice, where the periodic potential can lead to the stabilization of an otherwise unstable Bose-Einstein condensate. The behavior of Bose-Einstein condensate in optical lattices is described by the nonlinear Gross-Pitaevskii equation, which we treat numerically. By applying the Petviashvili iteration method, we demonstrate the existence of solitonic solutions in the case of counterpropagating matter waves, and analyze their stability.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 507-509
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Nb-Alloying on High-Temperature Oxidation of $MoSi_2$
Autorzy:
Sharif, A.
Powiązania:
https://bibliotekanauki.pl/articles/1292625.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.75.Lm
Opis:
The effects of alloying with 0.5, 1.0, and 2.0 at.% Nb on oxidation resistance of $MoSi_2$ are investigated at temperature range of 1400°C-1700°C. Rapid formation of a stable protective layer of silica resulted in a parabolic oxidation rate. The oxide layer thickness and the sample weight increased with increasing oxidation time. Impurities accelerated oxidation rate of $MoSi_2$ only slightly, however, did not affect the rate controlling mechanism for oxidation. There was no correlation between oxidation rate and the amount of impurity. The values of activation energies for oxidation of pure $MoSi_2$ and Nb-alloyed samples were similar to activation energy for diffusion of $O_2$ through silica. Diffusion of $O_2$ through the oxide scale remained the rate controlling mechanism with or without Nb impurity.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 563-566
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of GGG Epitaxial Films Grown from PbO-B₂O₃-V₂O₅ Flux
Autorzy:
Syvorotka, I.
Sugak, D.
Luchechko, A.
Zhydachevskyy, Ya.
Ubizskii, S.
Powiązania:
https://bibliotekanauki.pl/articles/1030998.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Lm
78.66.Nk
Opis:
The paper reports a growth of the high-quality Gd₃Ga₅O₁₂ (GGG) homoepitaxial films by the liquid phase epitaxy technique using the PbO-B₂O₃ and PbO-B₂O₃-V₂O₅ fluxes. The influence of the flux composition containing V₂O₅ as well as the growth temperature is discussed basing on the optical absorption and the electron probe micro analysis results.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 954-958
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Droplet Epitaxy as an Efficient Tool for Thin Film Magnetic Field Sensor Manufacturing
Autorzy:
Shkar', V.
Spiridonov, V.
Salkov, I.
Morenko, V.
Powiązania:
https://bibliotekanauki.pl/articles/1429055.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Lm
85.70.Kh
Opis:
The modified liquid-phase epitaxy method have been used to obtain submicron iron-yttrium garnet ferrite films in vortex state. There is shown a possibility to use these films for creating sensors, which are very sensitive to zero magnetic field.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1288-1289
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-Maintaining Defect/Energetic Droplets from Two Interacting Bose-Einstein Condensates
Autorzy:
Dzhunushaliev, V.
Powiązania:
https://bibliotekanauki.pl/articles/1399170.pdf
Data publikacji:
2013-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.75.Lm
03.75.Nt
Opis:
We consider two interacting Bose-Einstein condensates with different kinds of the potential energy of interaction of the condensates: (a) the standard potential, (b) the potential has a positive three-body and a negative two-body scattering terms, and (c) the potential has a positive four-body and a negative three-body scattering terms for the first Bose-Einstein condensate and a positive three-body and a negative two-body scattering terms for the second Bose-Einstein condensate. It is shown that in these cases there exist stationary regular spherically symmetric solutions. Physically such solution is either a defect or an energetic droplet created by the condensates. The defect is a cavity filled with one Bose-Einstein condensate on the background of another Bose-Einstein condensate. The droplet is an object with zero energy density at the infinity. For (a) and (b) cases the obtained objects are supported by a constant external trapping potential and for (c) case the droplet is a self-maintaining object without any external potential. The possibility of construction of an elementary logic qubit device on the basis of this droplet is discussed.
Źródło:
Acta Physica Polonica A; 2013, 124, 4; 629-635
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetically Induced Transparency in a Double Well Atomic Josephson Junction
Autorzy:
Weatherall, J.
Search, C.
Powiązania:
https://bibliotekanauki.pl/articles/1791182.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
03.75.Lm
Opis:
Electromagnetically induced transparency is an important tool for controlling light propagation and nonlinear wave mixing in atomic gases with potential applications ranging from quantum computing to table top tests of general relativity. Here we consider electromagnetically induced transparency in an atomic Bose-Einstein condensate trapped in a double well potential. One well is prepared as in standard electromagnetically induced transparency with a weak probe laser and control laser in a Λp configuration while tunneling between the wells provides a coherent coupling between identical electronic states in the two wells leading to the formation of spatially delocalized inter-well dressed states. The macroscopic inter-well coherence of the Bose-Einstein condensate wave function qualitatively modifies the normal electromagnetically induced transparency linear susceptibility and leads to the formation of additional absorption resonances and larger dispersion than electromagnetically induced transparency. We show that these new resonances can be interpreted in terms of the inter-well dressed states and the formation of a novel type of dark state involving the control laser and the inter-well tunneling.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 455-459
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modulation Instability of Two-Dimensional Dipolar Bose-Einstein Condensate in a Deep Optical Lattice
Autorzy:
Wöllert, A.
Gligorić, G.
Škorić, M.
Maluckov, A.
Raičević, N.
Daničić, A.
Hadžievski, Lj.
Powiązania:
https://bibliotekanauki.pl/articles/1791212.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.75.Lm
05.45.Yv
Opis:
We study the stability of the continuous waves in the pancake shaped dipolar Bose-Einstein condensate trapped in the strong optical lattice potential with the coexisting local (the short-range s-wave) interaction and nonlocal (the dipole-dipole) interactions between the condensate atoms. The system is modeled by two two-dimensional discrete models derived from the Gross-Pitaevskii equation accounting the dipole-dipole interactions: discrete nonlinear Schrödinger equation with cubic nonlinearity and nonpolynomial Schrödinger equation. The corresponding dispersion relations are calculated analytically and the regions of the modulation instability in the parametric space are summarized into the stability diagrams.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 519-521
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Counterion Effects on the Structure of Langmuir-Blodgett Films of a Benzothiazolium Dye
Autorzy:
Ashwell, G. J.
Jefferies, G.
Hamilton, D. G.
Handa, T.
Powiązania:
https://bibliotekanauki.pl/articles/1933614.pdf
Data publikacji:
1995-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Lm
73.20.Μf
Opis:
Langmuir-Blodgett films of salts of the two-legged cationic dye, E-N-hexadecyl-2-[2-(4-docosylaminophenyl)ethenyl]benzothiazolium, are Z-type. The molecular configuration within the Langmuir-Blodgett film is either "U-shaped" or "stretched" depending upon the nature of the anion, the thickness per layer being 35.1 Å for the octadecylsulphate and 54.1 Å for the iodide. For the Langmuir-Blodgett monolayers the principal components of the second order susceptibility (χ$\text{}_{zzz}^{(2)}$) are 70 pm V$\text{}^{-1}$ and 34 pm V$\text{}^{-1}$ respectively at 532 nm. In the case of the octadecylsulphate salt it was possible to fabricate thick multilayer Langmuir-Blodgett films; the second harmonic intensity increased with the number of Z-type layers, albeit subquadratically, and this may be ascribed to a progressive variation in the chromophore tilt angle.
Źródło:
Acta Physica Polonica A; 1995, 88, 3; 483-488
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of efficiency of Lean Manufacturing and Six Sigma in a production enterprise
Autorzy:
Bożek, M.
Hamrol, A.
Powiązania:
https://bibliotekanauki.pl/articles/406752.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Lean Manufacturing
LM
Six Sigma
economic efficiency
Opis:
The aim of the paper is to identify, on the basis of selected examples, the effectiveness of Lean Manufacturing (LM) and Six Sigma (SS) techniques in a large-production enterprise characterized by low-volume production, a wide product range, stabilized manufacturing technology and a so-called "brownfield" site. Many scholars have attempted to answer which approach, LM or SS, is more effective in a production enterprise. The authors of the paper aim to answer this question on the basis of a detailed analysis of efficiency of implementation of both techniques. The amount of savings generated from undertaken projects and increase of profitability of the analysed production system have served as performance measurements.
Źródło:
Management and Production Engineering Review; 2012, 3, 4; 14-25
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uwarunkowania wdrożenia koncepcji lean management w sektorze MŚP
The conditions for the implementation of the lean management concept in the SME sector
Autorzy:
Żebrucki, Z.
Kruczek, M.
Powiązania:
https://bibliotekanauki.pl/articles/325713.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
Lean Management
małe i średnie przedsiębiorstwa
wdrażanie LM
elastyczność
small and medium-sized enterprises
flexibility
implementation of LM
Opis:
Wdrażanie koncepcji Lean Manufacturing w MŚP jest ciągle ważnym i aktualnym zagadnieniem badawczym. Celem artykułu jest analiza stopnia wdrożenia Lean w działalności MŚP i identyfikacja głównych barier hamujących wykorzystanie tej koncepcji w ich działalności. Wyniki wskazują, że pomimo obaw MŚP decydują się na wdrożenie niektórych narzędzi Lean wskazując jak przeszkody czynniki natury kadrowej, finansowej i organizacyjnej.
The implementation of the Lean Manufacturing concept in SMEs is still an important and topical research issue. The aim of the article is to analyze the degree of Lean implementation in SME activities and to identify the main barriers hindering the use of this concept in their activities. The results indicate that despite the concerns of SMEs decide to implement some lean tools, indicating how the obstacles are of a human resources, financial and organizational nature.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2018, 120; 257-272
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of Microstructure and Properties of Extruded Mg-Li-Al Alloys of α and α+ β Phase Composition using ECAP Processing
Autorzy:
Dutkiewicz, J.
Rusz, S.
Maziarz, W.
Skuza, W.
Kuc, D.
Hilser, O.
Powiązania:
https://bibliotekanauki.pl/articles/1033018.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
83.50.-v
81.40.Lm
81.20.Fw
Opis:
Two magnesium based alloys containing 4.5 wt% Li and 1.5 wt% Al (alloy 1) and 9 wt% Li and 1.5 wt% Al (alloy 2) were cast under argon atmosphere and hot extruded at 350°C. Microstructure of alloy 1 consisted of hexagonal α phase of average grain size 20 μm and small aluminum rich precipitates being the most probably AlLi₂Mg phase. Alloy 2 in the extruded form consisted of lamellas of α+ β phases of thickness 5-20 μm and length above 100 μm. Significant grain refinement down to about 2 μ m was observed in one-phase hexagonal (hcp) alloy 1 after one pass of ECAP processing with helical component. Two-phase (hcp + bcc) alloy 2 showed higher non-homogeneity after the first equal channel angular pressing pass due to easier deformation of softer bcc phase, while both, α and β phases exhibited low angle grain boundaries. The hardness and the yield strength of the alloys were higher for alloy 1 (68 HV and 205 MPa, respectively) than those of alloy 2 (61 HV and 175 MPa). Subsequent equal channel angular pressing passes were performed at lower extrusion stress. The hardness of both alloys did not change significantly after subsequent equal channel angular pressing passes and revealed tendency to decrease. Two-phase alloy showed superplastic properties already after one equal channel angular pressing pass at 160°C with grain growth after superplastic tensile testing. Single phase hcp alloy did not show such properties after 1 pass, but after a few equal channel angular pressing passes it could be superplastically formed.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1303-1306
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spontaneous Currents in a Bosonic Ring
Autorzy:
Makieła, D.
Maśka, M.
Powiązania:
https://bibliotekanauki.pl/articles/1398603.pdf
Data publikacji:
2016-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.75.Lm
03.75.Kk
64.60.Ht
Opis:
Nonequilibrium dynamics of non-interacting bosons in a one-dimensional ring-shaped lattice is studied by means of the kinetic Monte Carlo method. The system is approximated by the classical XY model (the kinetic term is neglected) and then the simulations are performed for the planar classical spins. We study the dynamics that follows a finite-time quench to zero temperature. If the quench is slow enough the system can equilibrate and finally reaches the ground state with uniform spin alignment. However, we show that if the quench is faster than the relaxation rate, the system can get locked in a current-carrying metastable state characterized by a nonzero winding number. We analyze how the zero-temperature state depends on the quench rate.
Źródło:
Acta Physica Polonica A; 2016, 130, 2; 569-572
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Structural Potential on Magnetic Vortex Solitons in Spatially 1D-Extended Josephson Junction
Autorzy:
Al-Khawaja, S.
Powiązania:
https://bibliotekanauki.pl/articles/1399497.pdf
Data publikacji:
2013-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Yv
03.75.Lm
02.60.Cb
Opis:
Soliton evolution in spatially extended Josephson junction is studied for three types of ad hoc structural potentials describing tunnelling magnetic flux vortices; symmetric, ratchet and double-well. Setting from the inline geometry of the junction, the soliton dynamics could be modelled by the perturbed sine-Gordon equation. Numerical solutions of the latter equation yielded the soliton waves of the fluxon phase, for boundary conditions imposed on the system upon variation of the dispersion parameter α. It has been found that a change in the soliton waveform and intensity occurs as α goes higher, in dependence on the functional of the potential and its symmetry properties. For ratchet and double-well potential at α=0.5, a time-dependent forcing has been found to endorse the balance between dispersion and nonlinearity, jointly with enhancing the stability of the soliton wave. The McLoughlin-Scott perturbation theory has been adopted to show that the system conserves energy due to the delicate balance between nonlinearity and dispersion, so that the soliton keeps robust as it temporally evolves.
Źródło:
Acta Physica Polonica A; 2013, 124, 1; 35-40
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fermionic Mediated Effective Interaction for the Two-Dimensional Bose-Fermi Mixtures under Artificial Magnetic Field
Autorzy:
Polak, T.
Powiązania:
https://bibliotekanauki.pl/articles/1429103.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.30.Jp
03.75.Lm
03.75.Nt
Opis:
The strongly interacting bosonic and non-interacting fermionic mixtures of diluted gases are studied. An artificial magnetic field is introduced in theory by imposing a Peierls phase shift on the wave functions of the constituents. A highly nontrivial limit of the quantum-Hall limit is achieved which provides oscillations effects of the fermion mediated interaction between bosons. In consequence the effective interaction between bosons can change the magnitude and sign. This provides possible explanations of the bosonic coherence loss observed experimentally in the "time of flight" and "peak width" experiments.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1308-1311
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 89

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