Skocz do pozycji: 1.

Tytuł:

Effects of the Spin-Dependent Potential fluctuations on Free Exciton Zeeman Splitting of Zn$\text{}_{1-x}$Mn$\text{}_{x}$Se

Autorzy:

Herbich, M.
Mac, W.
Stachow, A.
Twardowski, A.
Tworzydło, J.
Demianiuk, M.

Powiązania:

https://bibliotekanauki.pl/articles/1950805.pdf

Data publikacji:

1996-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls

Opis:

Magnetoreflectance of free exciton and magnetization in Zn$\text{}_{1-x}$Mn$\text{}_{x}$Se (0.0007 < x < 0.12) were measured. The evaluated proportionality factor between the exciton splitting and the magnetization showed a strong concentration dependence. This effect cannot be explained within the mean field approximation and the virtual crystal approximation and it was described within the model including chemical and magnetic disorder.

Źródło:

Acta Physica Polonica A; 1996, 90, 4; 813-816
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Magnetooptical Properties of GaAs:Mn

Autorzy:

Szczytko, J.
Stachow, A.
Mac, W.
Twardowski, A.
Becla, P.
Tworzydło, J.

Powiązania:

https://bibliotekanauki.pl/articles/1952188.pdf

Data publikacji:

1996-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls

Opis:

Magnetoreflectance from GaAs:Mn was measured in the free exciton range for B ≤ 5 T and T = 2.0 K. Combining optical results with magnetization data the value for the exchange parameter N$\text{}_{0}$α-N$\text{}_{0}$β =-(2.3 ± 0.6) eV was obtained. Assuming that N$\text{}_{0}$α ≈ +0.2 eV, the ferromagnetic p-d exchange interaction was found with the magnitude N$\text{}_{0}$β ≈ +2.5 eV.

Źródło:

Acta Physica Polonica A; 1996, 90, 5; 951-954
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Waveguiding in Thin Films with Quadratic Magneto-Optical Medium

Autorzy:

Pištora, J.
Domański, A.
Bárta, O.
Staněk, F.
Postava, K.
Ciprian, D.
Kopřiva, I.

Powiązania:

https://bibliotekanauki.pl/articles/2014713.pdf

Data publikacji:

2001-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls

Opis:

The waveguiding in thin planar structures with quadratic magneto-optical medium is analysed. The permittivity tensor elements with quadratic magneto-optical constants are specified. From synchronous condition for guided modes in layered system with magnetic ordering the dispersion relation of waveguide is presented. The reflection coefficients for s-polarized light at transversal, longitudinal, and polar configurations as incidence angle function are described. The influence of quadratic magneto-optical effect on the resonant character of the waveguiding term is described in detail. The theory covers the situation in which the optical response of the structure is linear in the amplitude of the incident wave.

Źródło:

Acta Physica Polonica A; 2001, 99, 1; 17-23
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

New Contribution to Faraday and Kerr Magneto-Optical Effects in Ferromagnets

Autorzy:

Vedyayev, A.
Zhuravlev, M.
Lobachev, A.

Powiązania:

https://bibliotekanauki.pl/articles/1030420.pdf

Data publikacji:

2018-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls

Opis:

We consider a new magneto-optic effect based upon spin-orbit interaction of the conducting electrons in ferromagnetic metal with the electric field of plane polarized light wave. We calculated off-diagonal components of conductivity tensor for this mechanism of a.c. conductivity. These components determine the current induced by the light wave in the direction perpendicular to the plane of the light polarization. Numerical evaluation shows that the conductivity for this new effect exceeds the off-diagonal components of conductivity tensor for ordinary magneto-optic effect. The components appear to be still considerably smaller than the diagonal elements of the conductivity tensor.

Źródło:

Acta Physica Polonica A; 2018, 133, 3; 523-525
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Magnetooptical Studies of Bulk Diluted Magnetic Semiconductors

Autorzy:

Gaj, Jan

Powiązania:

https://bibliotekanauki.pl/articles/1888049.pdf

Data publikacji:

1991-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls

Opis:

Recent developments in physics of large gap II-VI Diluted Magnetic Semiconductors (DMS) studied by means of magnetooptical methods are reviewed. Applicability of the Heisenberg Hamiltonian to describe the ion-carrier interaction in new DMS materials is discussed. The paper includes anisotropy related phenomena, new type of bound magnetic polarons found in Van Vleck paramagnetic (Cd,Fe)Se and discusses application of magnetic field to study kinetics of Raman cascades in DMS.

Źródło:

Acta Physica Polonica A; 1991, 80, 2; 171-178
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Badania sprężynowania powrotnego blachy stalowej nierdzewnej AMS5604 w podwyższonej temperaturze
The investigation of springback phenomenon of AMS5504 stainless steel sheet at elevated temperature

Autorzy:

Trzepieciński, T.
Nowotyńska, I.
Stachowicz, F.
Malinowski, T.
Pieja, T.

Powiązania:

https://bibliotekanauki.pl/articles/314510.pdf

Data publikacji:

2016

Wydawca:

Instytut Naukowo-Wydawniczy "SPATIUM"

Tematy:

blacha
program LS-Dyna
temperatura
steel sheet
LS-Dyna program
temperature

Opis:

Sprężynowanie powrotne blachy stalowej nierdzewnej AMS5604 o grubości 1 mm określono w próbie swobodnego gięcia blachy za pomocą walcowego stempla. Badania eksperymentalne gięcia zrealizowano na specjalnym przyrządzie umożliwiającym pomiar wartości sprężynowania blachy. Symulacje numeryczne za pomocą metody elementów skończonych procesu gięcia blachy przeprowadzono za pomocą programu LS-Dyna. Symulacje numeryczne zostały wykonane dla procesu gięcia odbywającego się w temperaturze otoczenia oraz w temperaturach podwyższonych: 400°C, 500°C, 600°C, 650°C i 700°C. Otrzymane wyniki wskazują, że współczynnik sprężynowania blachy zmniejsza się liniowo wraz ze wzrostem temperatury. Ponadto, podczas procesu gięcia w badanym zakresie temperatury dochodzi do zmiany grubości blachy. Temperatura obróbki blachy jest czynnikiem decydującym o wartości granicznej odkształcalności blachy i determinuje końcowy kształt wyrobu.
To determine the value of springback coefficient of sheet metal the cylindrical bending test was conducted. The experimental tests of bending process were carried out using special device which allows to measure the value of sheet springback. As a test material we used the AMS 5604 alloy sheet metal with a sheet thickness of 1 mm. The numerical simulations by finite element method of the cylindrical bending test was conducted using LS-Dyna program. The simulations were conducted at the room temperature (20°C) and at elevated temperatures: 400°C, 500°C, 600°C, 650°C i 700°C. The results indicated that the value of springback coefficient of the sheet decreases with the increasing of temperature. Furthermore, during the bending process at analysed temperature the linear variation in sheet thickness is observed. The forming temperature value influences the value of limit strains of the sheet and determines the final shape of product.

Źródło:

Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 6; 1180-1185
1509-5878
2450-7725

Pojawia się w:

Autobusy : technika, eksploatacja, systemy transportowe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

An integrated approach to estimate storage reliability with masked data from series system

Autorzy:

Zhang, Yongjin
Zhao, Ming

Powiązania:

https://bibliotekanauki.pl/articles/27322965.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

storage reliability
masked data
EM-LS algorithm
series system
LS method

Opis:

Storage reliability is of importance for the products that largely stay in storage in their total life-cycle such as warning systems for harmful radiation detection, and many kinds of defense systems, etc. Usually, the field-testing data can be available, but the failure causes for a series system cannot be always known because of the masked information. In this paper, the storage reliability model with possibly initial failures is studied on the statistical analysis method when the masked data are considered. To optimize the use of the masked survival data from storage systems, a technique based on the least squares (LS) method with an EM-like algorithm, is proposed for the series system. The parametric estimation procedure based on the LS method is developed by applying the algorithm to update the testing data, and then the LS estimation for the initial reliability and failure rate of the components constituting the series system are investigated. In the case of exponentially distributed storage lifetime, a numerical example is provided to illustrate the method and procedure. The results should be useful for accurately evaluating the production reliability, identifying the production quality, and planning a storage environment.

Źródło:

Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 172922
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Determination of Energy Expenditure in the Drawing Process in the Aspect of Environment
Określanie nakładu energetycznego w procesie wytłaczania w aspekcie ochrony środowiska

Autorzy:

Kałduński, P.
Bohdal, Ł.
Chodór, J.
Kułakowska, A.
Patyk, R.

Powiązania:

https://bibliotekanauki.pl/articles/1813947.pdf

Data publikacji:

2016

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

deep drawing
energy expenditure
Ansys/Ls-Dyna
wytłaczanie
nakład energetyczny
Ansys Ls-Dyna

Opis:

The main objective of this publication is to present the possibilities of using the numerical calculations to determine the force and the total drawing work. Minimizing the effort of energy is an important element in modern mass production, because the rapid determination of the total work allows optimizing the production process and reduce its harmful effects on the environment. In this paper summarizes the numerical results with experimental data for the purpose of verification. It was confirmed that at significance level α = 0,05 results of simulation are consistent with experimental. It has been determined that on the overall drawing work has an influence the profile of the die and the friction conditions in the contact zone.
Głównym celem tej publikacji jest przedstawienie możliwości zastosowania obliczeń numerycznych do wyznaczania siły i całkowitej pracy tłoczenia. Minimalizacja nakładu energetycznego jest ważnym elementem w nowoczesnej produkcji masowej, dlatego szybkie wyznaczenie całkowitej pracy pozwala optymalizować proces produkcyjny i zmniejszyć jego szkodliwy wpływ na środowisko. W pracy zestawiono wyniki numeryczne z eksperymentalnymi w celu ich weryfikacji. Potwierdzono, że na poziomie istotności α = 0,05 wyniki symulacyjne są zgodne z eksperymentalnymi. Określono, że na całkowitą pracę tłoczenia ma wpływ profil matrycy i warunki tarcia w obszarze kontaktu narzędzi.

Źródło:

Rocznik Ochrona Środowiska; 2016, Tom 18, cz. 1; 171-187
1506-218X

Pojawia się w:

Rocznik Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Numerical modeling of sheet metal forming process using an LS-Dyna Electromagnetism (EM) module
Modelowanie numeryczne procesów kształtowania blach przy użyciu modułu Electromagnetism (EM) w programie LS-DYNA

Autorzy:

Trzepieciński, T.
Nowotyńska, I.
Malinowski, T.
Hojny, M.
Pieja, T.

Powiązania:

https://bibliotekanauki.pl/articles/310742.pdf

Data publikacji:

2017

Wydawca:

Instytut Naukowo-Wydawniczy "SPATIUM"

Tematy:

impuls elektromagnetyczny
program LS-DYNA
kształtowanie materiału
electromagnetic pulse
LS-DYNA software
material forming

Opis:

Electromagnetic pulse technology (EMPT) is a touchless method used for forming, blanking and joining of materials conducted electric current. Electromagnetic pulse interaction is also a method of plastic forming of materials with high velocity strains. In this paper the theoretical principles and physical phenomena occurred during electromagnetic pulse sheet forming are discussed. Furthermore, an example of the numerical modelling of electromagnetic forming in the Electromagnetism (EM) module of LS-Dyna® solver.
Technologia impulsu elektromagnetycznego (TIEM) jest metodą bezdotykową służącą do zmiany kształtu, cięcia oraz łączenia materiałów przewodzących prąd elektryczny. Oddziaływanie impulsem elektromagnetycznym jest również jedną z metod plastycznego kształtowania materiałów dużymi prędkościami odkształcenia. W artykule omówiono podstawy teoretyczne oraz przedstawiono zjawiska fizyczne zachodzące podczas kształtowania blach impulsem elektromagnetycznym. Przedstawiono również przykład modelowania numerycznego procesu TIEM przy użyciu modułu Electromagnetism (EM) programu LS-Dyna®.

Źródło:

Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 6; 1108-1111, CD
1509-5878
2450-7725

Pojawia się w:

Autobusy : technika, eksploatacja, systemy transportowe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Numeryczne wyznaczanie całkowitej wartości pracy stempla w procesie tłoczenia elementów samochodowych
Numerical determination of the total work stamp value in the drawing process of the car elements

Autorzy:

Kałduński, P.
Bohdal, Ł.
Chodór, J.

Powiązania:

https://bibliotekanauki.pl/articles/313227.pdf

Data publikacji:

2014

Wydawca:

Instytut Naukowo-Wydawniczy "SPATIUM"

Tematy:

modelowanie
wytłaczanie
Ansys Ls-Dyna
analiza numeryczna
modelling
drawing
Ansys/Ls-Dyna
numerical analysis

Opis:

W niniejszym artykule przedstawiono numeryczny sposób określenia całkowitej pracy niezbędnej do ukształtowania wyrobu w procesie tłoczenia. Numeryczne analizy i symulacje przeprowadzono w programie Ansys/Ls-Dyna. Przeanalizowano zarówno maksymalną siłę potrzebną do ukształtowania gotowego wyrobu jak i całkowitą pracę niezbędną do wykonania przez stempel. Porównano wyniki numeryczne z dwóch matryc promieniowych: o promieniu 12 mm oraz 18 mm, a także z matrycy o profilu krzywoliniowym. Przedstawiono wybrane wyniki symulacji oraz zestawiono je na zbiorczych wykresach.
This article presents a numerical method of determining the total work required to shape the product in the drawing process. Numerical analysis and simulations were performed in Ansys/Ls-Dyna program. Was analyzed both, the maximum drawing force needed to shape the finished product and the total work required to be executed by the punch. Numerical results were compared with two radial dies: radius of 12 mm and 18 mm, and with the curvilinear profile die block. Presents chosen results of simulation and summarizes them in collective charts.

Źródło:

Autobusy : technika, eksploatacja, systemy transportowe; 2014, 15, 6; 152-157
1509-5878
2450-7725

Pojawia się w:

Autobusy : technika, eksploatacja, systemy transportowe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Sposoby modelowania elementów konstrukcji wsporczych infrastruktury drogowej
Methods of modeling of road’s infrastructure support elements

Autorzy:

Stopel, M.
Burak, M.

Powiązania:

https://bibliotekanauki.pl/articles/95414.pdf

Data publikacji:

2014

Wydawca:

Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB

Tematy:

LS-Dyna
MES
konstrukcje wsporcze
bezpieczeństwo bierne
LS-DYNA
FEM
support elements
passive safety

Opis:

W pracy przedstawiono wybrane sposoby modelowania słupa wsporczego znaku drogowego w programie LS-Dyna. Podjęto próbę wykazania zalet i wad dla poszczególnych rozwiązań. Podczas analizy skupiono się na sposobie modelowania słupa, upraszczając pozostałe elementy konstrukcji w tym utwierdzenie w podłożu.
This paper presents some ways of modeling the supporting pole for a traffic sign in the LS-Dyna. An attempt was made to demonstrate the advantages and disadvantages for each solution. Analysis is focused on the modeling method, whereas the the remaining elements of construction are simplified.

Źródło:

Postępy w Inżynierii Mechanicznej; 2014, 3(2); 49-57
2300-3383

Pojawia się w:

Postępy w Inżynierii Mechanicznej

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Simulation of damage process of containership’s side structure due to collision with a rock

Autorzy:

Porembski, G.
Kozak, J.

Powiązania:

https://bibliotekanauki.pl/articles/963393.pdf

Data publikacji:

2008

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

collision
LS-DYNA
FEM
numerical simulation

Opis:

This paper presents methods and results of a simplified numerical simulation of collision process of containership’s side structure and a rock. Analysis of results of the modeling makes it possible to draw conclusions as to a character of the event as well as to estimate area and depth of damage caused by the penetrating rock, in order to select geometry of a filler and impermeable layer of 2nd protection barrier.

Źródło:

Polish Maritime Research; 2008, S 1; 18-21
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Mechanisms of the Magneto-Optical Activity of Rare-Earth Ions in Rare-Earth Iron Garnet Single Crystals

Autorzy:

Tsidaeva, N.
Abaeva, V.
Magkoev, T.

Powiązania:

https://bibliotekanauki.pl/articles/1490761.pdf

Data publikacji:

2012-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Gg
78.20.Ls

Opis:

The magnetic and magneto-optical properties of the typical representatives of three rare-earth iron garnets (RIG) groups: with heavy rare-earth elements Yb, Er, Dy, Tb; with elements from the middle of lanthanide series Gd, Sm, and with light rare-earth element Nd are presented. In contradistinction to other work on the Faraday rotation, which were done only at 1152 nm (8696 $cm^{-1}$), here we present FR spectra obtained in the energy region 5500-20000 $cm^{-1}$ with high optical resolution. The investigations have been done at temperatures of 5, 82, 130, 295 K using magnetic field up to 25 kOe applied parallel to the [111] crystallographic axis of the crystals. It has been shown that the contribution proportional to the magnetic field and independent of temperature to the mixing of the ground state multiplets exceeds the paramagnetic contribution in YbIG, ErIG, GdIG, SmIG. In Tb and Dy iron garnets contributions from the two mechanisms have opposite signs, and the paramagnetic mechanism gives the greatest contribution to the Faraday rotation. Nevertheless, the contribution of the diamagnetic mechanism, caused by the influence of the exchange field in the iron sublattices on rare-earth ions, is significant, and it is necessary to take it into account. Anomalously large magneto-optical activity is observed in NdYIG. This is the result of contributions of the same sign and approximately equal in magnitude from the paramagnetic and diamagnetic mechanisms.

Źródło:

Acta Physica Polonica A; 2012, 121, 1; 74-77
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Magneto-Optical and Optical Investigation of the Surface Region of Ion implanted Garnet Films

Autorzy:

Lali, Kalandadze

Powiązania:

https://bibliotekanauki.pl/articles/1387379.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.70.Cn
78.20.Ls

Opis:

In the present work we have shown the efficiency of complex investigation of the ion implanted garnet surface region by magneto-optical and optical methods. We have investigated the optical and magneto-optical properties of the ion-implanted (YBiCaSm)₃(FeGeSi)₅O₁₂ garnet films. It has shown that ion implantation influences significantly the magneto-optical properties of the garnet films and practically does not change its optical characteristics. We have also determined the spectral dependences of the component of the tensor of dielectric permittivity for the surface of ion implanted (YBiCaSm)₃(FeGeSi)₅O₁₂ ferrite-garnet films before and after implantation process. These calculations let us evaluate the influence of implantation on an electronic energy structure of the surface layer for the sample.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 582-584
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Changes of FIR Reflectivity of HgSe:Cr in a Magnetic Field

Autorzy:

Hausenblas, M.
Wyder, P.
Witowski, A. M.
Wittlin, A.
Mycielski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1921666.pdf

Data publikacji:

1992-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
78.30.Fs

Opis:

The results of FIR magnetoreflectivity of HgSe:Cr are presented. They are interpreted using a classical dynamic dielectric function.

Źródło:

Acta Physica Polonica A; 1992, 82, 5; 741-744
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Do the Mixed Crystals HgSeS Exhibit the One-Mode Behavior?

Autorzy:

Szuszkiewicz, W.
Witowski, A. M.
Julien, C.
Balkanski, M.
Dybko, K.
Witkowska, B.
Mycielski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1924226.pdf

Data publikacji:

1992-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
78.30.Fs

Opis:

The low-temperature far-infrared reflectivity spectra of HgSe and HgSeS are measured and analysed. The results suggest the one-mode behavior of phonon excitations in HgSeS mixed crystals.

Źródło:

Acta Physica Polonica A; 1992, 82, 5; 887-889
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Exciton States in Type-II ZnSe/BeTe Quantum Wells

Autorzy:

Platonov, A. V.
Yakovlev, D. R.
Zehnder, U.
Kochereshko, V. P.
Ossau, W.
Fischer, F.
Litz, Th.
Waag, A.
Landwehr, G.

Powiązania:

https://bibliotekanauki.pl/articles/1968413.pdf

Data publikacji:

1997-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
78.66.Hf

Opis:

We present an optical investigation of novel heterostructures based on beryllium chalcogenides with a type-I and type-II band alignment. In the type-II quantum well structures (ZnSe/BeTe) we observed a strong exciton transition involving an electron confined in the conduction band well and a hole localized in the valence band barrier (both in ZnSe layer). This transition is drastically broadened by the temperature increase due to enhanced exciton-acoustic phonon interaction.

Źródło:

Acta Physica Polonica A; 1997, 92, 5; 953-957
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

s,p-d Exchange Constants of ZnFeTe Diluted Magnetic Semiconductor

Autorzy:

Mac, W.
Herbich, M.
Nguyen, The Khoi
Twardowski, A.
Shapira, Y.
Demianiuk, M.

Powiązania:

https://bibliotekanauki.pl/articles/1933919.pdf

Data publikacji:

1995-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
71.70.Gm

Opis:

Reflectance and degree of polarization of reflectance of the free exciton in Zn$\text{}_{1-x}$Fe$\text{}_{x}$Te (x ≈ 0.002) was measured at T = 1.9 K and magnetic field up to 5 T. Combining the exciton splitting with the magnetization data we estimated the exchange constant N$\text{}_{0}$(α-β) = 2.1 eV.

Źródło:

Acta Physica Polonica A; 1995, 88, 5; 845-848
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Determination of Exciton Zeeman Splittings in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te from Faraday Rotation Measurements

Autorzy:

Stachow, A.
Nguyen, The Khoi
Gaj, J. A.

Powiązania:

https://bibliotekanauki.pl/articles/1933998.pdf

Data publikacji:

1995-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
71.35.+z

Opis:

Reflectivity and Faraday rotation measurements were carried out on Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te bulk crystals in the complete zinc-blende range of composition 0 < x ≤ 0.71. From a comparison of the results of these two experiments for samples with x ≤ 0.3, we demonstrate that the Faraday angle Θ, measured in limited spectral range, is proportional to the energy splitting of exciton states ΔE, measured at the same temperature (2 K) and magnetic field B (up to 5 T). The determined proportionality constant was used to calculate ΔE values also for x > 0.3. This allowed us to find an empirical description of ΔE values for the whole range of compositions as a function of B and x.

Źródło:

Acta Physica Polonica A; 1995, 88, 5; 909-912
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Effects of Photoluminescence Polarization in Semiconductor Quantum Well Subjected to In-Plane Magnetic Field

Autorzy:

Semenov, Yu. G.
Ryabchenko, S. M.

Powiązania:

https://bibliotekanauki.pl/articles/2038089.pdf

Data publikacji:

2004-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.67.-n
78.20.Ls

Opis:

Strong optical polarization anisotropy observed previously in the exciton photoluminescence from [100]-oriented quantum wells subjected to the in-plane magnetic field is described within microscopic approach. Developed theory involves two sources of optical polarization anisotropy. The first of them is due to correlation between ψ-functions phases of electron and heavy hole which arise owing to electron Zeeman spin splitting and joint manifestation of low-symmetrical and Zeeman interactions of heavy holes in an in-plane magnetic field. Other optical polarization anisotropy source stems from the admixture of light-holes states to heavy-holes ones by low-symmetry interactions. The heavy hole splitting caused by these interactions separately and the effects of their interference are analyzed. The domination of C$\text{}_{2v}$ low-symmetry interaction connected with quantum wells interfaces and/or in-plane deformations takes place in relatively low magnetic field. The directions of this perturbation determine main directions of the π-periodical optical polarization anisotropy. The cubic anisotropy of valence band can add the π/2-periodical contribution to the optical polarization anisotropy. In the case of quantum wells with semimagnetic barriers the Zeeman term contribution can reach value, which dominates the C$\text{}_{2v}$ ones, and crossover to polarization connected with magnetic field direction may be observed in low temperature.

Źródło:

Acta Physica Polonica A; 2004, 105, 6; 537-545
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Light Propagation in a Magnetic Field: Random Green Matrix Approach

Autorzy:

Pinheiro, F. A.
Rusek, M.
Orłowski, A.
van Tiggelen, B. A.

Powiązania:

https://bibliotekanauki.pl/articles/2037256.pdf

Data publikacji:

2004-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

42.25.Dd
78.20.Ls

Opis:

We studied the spectral properties of the matrices describing multiple scattering of electromagnetic waves from randomly distributed point-like magneto-optically active scatterers under an external magnetic field B. We showed that the complex eigenvalues of these matrices exhibit some universal properties such as the self-averaging behavior of their real parts, as in the case of scatterers without magneto-optical activity. However, the presence of magneto-optically active scatterers is responsible for a striking particularity in the spectra of these matrices: the splitting of the values of the imaginary part of their eigenvalues. This splitting is proportional to the strength of the magnetic field and can be interpreted as a consequence of the Zeeman splitting of the energy levels of a single scatterer.

Źródło:

Acta Physica Polonica A; 2004, 105, 4; 339-347
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Photoluminescence in Tilted Magnetic Field of Triply Negatively Charged Excitons Hybridized with a Continuum

Autorzy:

Van Hattem, B.
Corfdir, P.
Brereton, P.
Pearce, P.
Graham, A.
Stanley, M.
Hugues, M.
Hopkinson, M.
Phillips, R.

Powiązania:

https://bibliotekanauki.pl/articles/1399086.pdf

Data publikacji:

2013-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.66.Fd
78.20.Ls

Opis:

We analyse the magneto-photoluminescence of triply negatively charged excitons coupled to a continuum of states. The excitonic complex is confined to a Stranski-Krastanow InAs/GaAs quantum dot embedded in a Schottky diode. Different orientations of the magnetic field have been investigated. A modelling of the Coulomb blockade together with the calculation of the electron Fock-Darwin spectrum has allowed us to predict the magnetic fields of anticrossing between the quantum dot energy states and the wetting layer Landau levels. Good agreement between the theoretical model and the experimental results has been obtained.

Źródło:

Acta Physica Polonica A; 2013, 124, 5; 798-800
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Temperature and Intensity Dependent Faraday Rotation in Hg$\text{}_{1-x}$Mn$\text{}_{x}$Te at CO$\text{}_{2}$ Laser Wavelengths

Autorzy:

Kowałczyk, L.
Gałązka, R. R.

Powiązania:

https://bibliotekanauki.pl/articles/1891287.pdf

Data publikacji:

1991-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
75.30.El

Opis:

Faraday rotation in Hg$\text{}_{1-x}$Mn$\text{}_{x}$Te (x = 0.11) has been investigated experimentally over the temperature range from T = 8 K to 250 K using a Q-switched CO$\text{}_{2}$ laser. Due to the exchange interaction between mobile carriers and localized Mn ions, dramatic enhancement of Verdet coefficient at low temperatures has been observed. The values of Verdet coefficient V = 5585 rad T$\text{}^{-1}$ m$\text{}^{-1}$ at 8 K and V = 1745 rad T$\text{}^{-1}$ m$\text{}^{-1}$ at 80 K have been obtained for Hg$\text{}_{0.89}$Mn$\text{}_{0.11}$Te at 10.6 μm. The dependence of Faraday rotation on intensity of laser radiation has been observed. Intensity dependent Faraday rotation shows saturation for high laser power. Intensity induced rotation is qualitatively attributed to the dispersion associated with saturable absorption of laser radiation. The results obtained in this work indicate that Hg$\text{}_{1-x}$Mn$\text{}_{x}$Te is a suitable material for Faraday rotator at CO$\text{}_{2}$ laser wavelengths for high power laser beam.

Źródło:

Acta Physica Polonica A; 1991, 80, 3; 429-431
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Evaluation of methods for determining the LS index at different resolutions for soil erosion modeling using the RUSLE method

Autorzy:

Badora, Damian
Wawer, Rafał

Powiązania:

https://bibliotekanauki.pl/articles/37241617.pdf

Data publikacji:

2023

Wydawca:

Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy

Tematy:

LS factor
soil erosion
spatial resolution

Opis:

This paper investigates the impact of Digital Terrain Model (DTM) resolution on the calculation of the sediment transport capacity coefficient LS within the Bystra catchment, employing various methods through GIS software. The study focuses on the significant role of GIS in environmental research and process modeling, emphasizing the relevance of LS coefficient analysis in morphometry, hydrology, and geomorphology, particularly in the context of agricultural soil erosion. The study presents results from calculating the sediment transport capacity factor LS using three methods for different resolutions (1, 5, 10, 30, 90 meters). LS coefficient determination relies on the catchment area map and slope map, the latter determined using two methods. The catchment area considered is that of the Bystra River, a right tributary of the Vistula, flowing through Nałęczów, Wąwolnica, Celejów, Bochotnica in the Lublin Province. Upon determining the LS coefficient, variations in results are observed, dependent on the chosen method. The discussion section highlights differences in LS coefficient maps based on resolution and method, with notable distinctions in the north-western part for a 10-meter resolution. Analyzing LS coefficient maps at different resolutions, the study observes variations in results based on the method employed. Higher LS coefficient values are noted in the river channel for a 1-meter resolution, attributed to factors such as river bed structure, building rocks, terrain slope, and climate. The conclusions emphasize the use of specific methods for determining slope rasters and highlight the Desmet and Govers method as yielding smaller variances in LS coefficient determination compared to other methods. The study recommends DTM models with resolutions of 1, 5, and 10 meters for LS modeling, considering their beneficial influence on variance and resolution. In summary, this paper contributes valuable insights into the influence of DTM resolution on LS coefficient calculations, providing a nuanced understanding of the interplay between methods, resolution, and terrain characteristics in the context of sediment transport capacity.

Źródło:

Polish Journal of Agronomy; 2023, 52; 110-122
2081-2787

Pojawia się w:

Polish Journal of Agronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

The influence analysis of criteria of comparables’ selection on the accuracy of the property value estimation

Autorzy:

Zyga, Jacek

Powiązania:

https://bibliotekanauki.pl/articles/1396886.pdf

Data publikacji:

2020

Wydawca:

Politechnika Warszawska. Wydział Geodezji i Kartografii

Tematy:

similarity assessment criterion
property valuation
LS estimation

Opis:

The subject of the considerations presented in the article is the question of the criteria according to which the comparables, in the market value estimating process, should be selected. As the most important in the selection of comparative properties, the factor of similarity in relation to the subject property (measured by the Euclidean distance) was considered. As the key issue, the similarity assessment criterion and the influence of the adopted critical value of this criterion on the accuracy of estimates were chosen. The analysis of the above was carried out with taking into account the role of the significance of independent variables (measured by their correlation with the vector of the dependent variable). The results of the simulation tests carried out in the variants set by the criteria adopted were presented. On this basis, it has been shown that there is a potential most relevant solution in the collection of obtainable estimation results. This solution corresponds with the smallest sum of the differences of model prices (accepted as known) and corresponding estimates. The found minimum occurs for a specific layout of the above criterion values only.

Źródło:

Reports on Geodesy and Geoinformatics; 2020, 109; 9-15
2391-8365
2391-8152

Pojawia się w:

Reports on Geodesy and Geoinformatics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Porównanie możliwości analizy cylindrycznych elementów energochłonnych obciążonych impulsem wybuchu w systemach LS-dyna i MSD Dytran
Analysis of blast loaded energy absorbing elements using LS-dyna and MSC.Dytran systems

Autorzy:

Dacko, M.
Nowak, J.

Powiązania:

https://bibliotekanauki.pl/articles/387005.pdf

Data publikacji:

2008

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

MSC Dytran
LS-DYNA
symulacja numeryczna
numerical simulation

Opis:

W pracy przedstawiono problematykę modelowania elementów cylindrycznych obciążonych falą ciśnienia powstałą w wyniku detonacji ładunku materiału wybuchowego. Symulację numeryczną przeprowadzono w środowiskach programów MSC Dytran i LS-Dyna. Utworzono model numeryczny stanowiska do badań pakietów elementów cylindrycznych składającego się z nieodkształcalnej podstawy i przymocowanej do niej płyty bazowej. Stworzono model elementu energochłonnego. Obciążenie realizowano poprzez przyłożenie zmiennego w czasie ciśnienia do pokrywy górnej cylindra. Wyniki obliczeń numerycznych porównano z wynikami otrzymanymi na drodze eksperymentalnej.
The paper presents the problems of modeling cylindrical specimens, loaded by pressure wave from the blast of explosive charge. The numerical simulation was performed using MSC.Dytran and LS-Dyna. The test rig was setup in numerical model. It consisted of rigid base and the base plate resting on it. The model of energy absorbing cylinder was created. The load was modeled by applying a varying pressure to the top cover of the cylinder. The results of numerical simulation was compared to the results of experiments

Źródło:

Acta Mechanica et Automatica; 2008, 2, 1; 13-20
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Experimental and numerical investigation of connector with elastomer joint

Autorzy:

Sławiński, G.
Malesa, P.
Niezgoda, T.
Bogusz, P.

Powiązania:

https://bibliotekanauki.pl/articles/245319.pdf

Data publikacji:

2016

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

elastomer
connector
LS-Dyna
experimental tests
FEM analysis

Opis:

This paper presents works associated with the design, experimental tests and numerical analyses of a composite connector, which is a part responsible for increasing the safety of the soldiers. Nowadays researchers more and more often are searching for modern materials, which, as individual components or structures connected with other materials, meet the requirements of global markets. One of the most important branches of industry, which presently is growing increasingly are high technologies accompanying the safety of soldiers who are the passengers of a military vehicle. The proposed solution allows protection of the sensitive parts of body (e.g. legs), as well as the entire body of a soldier from the risks resulting from the impact of a pressure wave coming from explosion on the vehicle in which the soldier travels. A combination of classic materials, such as steel, and modern materials with hyperelastic characteristics might be an alternative to the currently used shock absorbers and dampers. Perspective can be using this assembly as a connector between a seat and the military vehicle body or special plates for protecting the crew’s feet resting on the floor of the vehicle during explosion of a mine or IED. The analysis is conducted using the LS-DYNA explicit code.

Źródło:

Journal of KONES; 2016, 23, 3; 473-480
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

The shape of abrasive grain generating methods in numerical analysis

Autorzy:

Forysiewicz, M.
Kukiełka, L.

Powiązania:

https://bibliotekanauki.pl/articles/100053.pdf

Data publikacji:

2012

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

abrasive grain
modeling
Ansys/Ls-Dyna
surface layer

Opis:

The aim of this work is to present the methods of abrasive grain numerical model geometry generation based on analysis of real grain pictures. The methodology of abrasive grain shape generation, for three different images analysis methods, was presented. Obtained an irregular geometry of abrasive grains. The possibility of implementation of irregular numerical grain models into the ANSYS program, will allow to the modeling and numerical simulation of machining process at higher accuracy of numerical results (the numerical model will have reduced simplifications in relative to the real machining process). The numerical results will be subjected to experimental verification and may provide a basis for further modeling studies in this scope.

Źródło:

Journal of Machine Engineering; 2012, 12, 4; 15-22
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Simulation on Flyrock due to Blasting Using Smoothed Particle Hydrodynamics (SPH) with LSDyna software

Autorzy:

Dinh, Bao Tran
Van, Trieu Do
Van, Viet Pham
An, Nguyen Dinh

Powiązania:

https://bibliotekanauki.pl/articles/24200704.pdf

Data publikacji:

2023

Wydawca:

Polskie Towarzystwo Przeróbki Kopalin

Tematy:

flyrock
smoothed particle hydrodynamics
simulation
blasting
LS-Dyna

Opis:

In surface mining operation, blasting method has been commonly used and accounted highly for breaking waste rock and mineral. The main goal of the activity is fundamental fragmentation by energy generation due to blasting. However, only 20% to 30% blasting energy is generated to fragment rock. The remain energry is wasted for flyrock, ground vibration, air overpressure, dust and too fine fragmentation. Flyrock in blasting is large risk for surface mines and occupies more than a half of incidents relating to blasting at surface mines, because this is a severe issue and causes negative reaction of the surrounding residients. However, studies on flyrock-phenomenon prediction methods for blasting in Vietnam have been also limited. In the study, simulation analysis method on induce-blasting-induced flyrock experiment using Smoothed Particle Hydrodynamics (SPH) with LS-Dyna software. Two-dimension modelling was built and practically applied for B2 cross section of Mong Son quarry in Yen Bai province. The result showed that the ability of Smoothed Particle Hydrodynamics (SPH) in analysizing flyrock trajectory distance in blasting. By using the modelling with field-site parameters, the researcher monitored flyrock velocity at installed time periods, such as 1.5 second when the flyrocks fly with a maximum distance of 85 m from blasting site and their average velocity of 40 m/s.

Źródło:

Inżynieria Mineralna; 2023, 2; 13--21
1640-4920

Pojawia się w:

Inżynieria Mineralna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

LS-Dyna contact procedure analysis for selected mechanical systems

Autorzy:

Małachowski, J.
Bukala, J.
Damaziak, K.
Tomaszewski, M.

Powiązania:

https://bibliotekanauki.pl/articles/245543.pdf

Data publikacji:

2015

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

contact
finite element method
LS-DYNA
shaft
sleeve

Opis:

Finite Element Method is one of the most frequently used computational schemes in numerical analyses. A contact phenomenon is an essential issue when modelling the physical interaction between two or more bodies. Depending on the used software, the various contact algorithms are applied. In the paper, the authors present the results of evaluation of different contact methods implemented in LS-Dyna CAE software. The most common problem arising during contact modelling is the occurrence of penetration between the coupling elements, which leads to an increase of contact forces and, consequently, a local deformation of finite elements. In the introduction, a theoretical background related to mathematical aspects of contact modelling is presented, in particular search methods for contact surfaces and the penalty forces calculating method. Subsequently, a contact analysis for different variants of interaction of the elements is presented. In the first analysed case, shaft- sleeve interaction, in both rotation and translation, is presented. The variable factors in this case were a number of interacting finite elements and the type of a contact algorithm. The second case focused on the interaction forces resulting from the interaction between two sliding bodies in the harmonic motion. A sliding body was pressed against the plane using an increasing force. A variable factor in this case was the type of the implemented contact algorithm.

Źródło:

Journal of KONES; 2015, 22, 1; 193-202
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Comparative study of potential whiplash injuries for different occupant seated positionsm during rear end accidents.

Autorzy:

Omerovic, S.
Tomasch, E.
Gutsche, A. J.
Prebil, I.

Powiązania:

https://bibliotekanauki.pl/articles/306862.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

biomechanika
LS-Dyna
FEM
kręgosłup
biomechanics
whiplash
spine

Opis:

Purpose: Whiplash injuries to the cervical spine represent a considerable economic burden on society with medical conditions, in some cases persisting for more than a year. Numerous studies of whiplash injuries have been made for occupant normal seated position, leaving the analysis of neck injuries for out-of-normal positions not well documented. For that purpose, a detailed human cervical spine finite element model was developed. Methods:The analysis was made for four most common occupant seated positions, such as: Normal Position with the torso against the seat back and the head looking straight ahead, Torso Lean forward position with the torso away from the seat back for approximately 10°, Head Flexed position with the head flexed forward approximately 20° from the normal position and HeadFlexed with Torso Lean forward position with the head flexed forward approximately 20° and torso 10° from the normal position. Results: The comparative study included the analysis of capsular ligament deformation and the level of S-curvature of the cervical spine. The developed model predicted that Head Flexed seated position and Head-Flexed with Torso Lean forward seated position are most threatening for upper and lower cervical spine capsular ligament respectively. As for the level of S-curvature, the model predicted that Head-Flexed with Torso Lean forward seated position would be most prone to neck injuries associated with it. Conclusions:This study demonstrated that the occupant seated position has a significant influence on potential whiplash injuries.

Źródło:

Acta of Bioengineering and Biomechanics; 2016, 18, 4; 145-158
1509-409X
2450-6303

Pojawia się w:

Acta of Bioengineering and Biomechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Numerical simulations of a bird strike against a helicopter windshield

Autorzy:

Ćwiklak, J.

Powiązania:

https://bibliotekanauki.pl/articles/245130.pdf

Data publikacji:

2018

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

bird strikes
helicopter windshield
numerical analysis
LS-DYNA

Opis:

The article presents simulation results of a bird strike with a helicopter windshield of small helicopter category. It turns out that there are no certification requirements regarding windshield of this category. Therefore Agusta A109 helicopter as a representing this helicopter category has been chosen for researcher. The simulations were conducted on the basis of LS-DYNA software by means of the SPH method for bird model shape of cylinder with hemispherical endings for the speed of Vc = 285 km/h. The analyses regarded various angles of the bird model impact into windshield. As a result of the simulations, comparative analyses in the aspect of time curves of the kinetic energy, velocity, and windshield deformation were achieved. The analysis shows that at smaller angles of attack, the bird’s model has a higher speed at the moment of impact, and thus greater kinetic energy, because it did not lose speed as a result of the collision. In addition, the deflection of the windshield is smaller. In some cases, the deflection of the windshield may be observed, which indicates the elastic response of the system. In case of impact in the normal direction to the surface of the glass, the bird’s model practically pierces it. The use of a thicker pane translates into less deformation of the pane, but causes its destruction at the connection point with the helicopter carrier structure.

Źródło:

Journal of KONES; 2018, 25, 2; 81-88
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

La costruzione dell’identità di genere nei manuali LS fra ideologia di genere e ideologia neoliberale: un’analisi comparativa dei manuali di italiano LS e di serbo LS
The Construction of Gender Identity in Textbooks at the Intersection between Gender Ideology and Neoliberal Ideology: A Comparative Analysis of Textbooks for Teaching Italian and Serbian as Foreign Languages

Autorzy:

Vučenović, Nataša

Powiązania:

https://bibliotekanauki.pl/articles/11541997.pdf

Data publikacji:

2023-06-30

Wydawca:

Wydawnictwo Adam Marszałek

Tematy:

foreign language textbooks
Italian FL
Serbian FL
clothes and fashion
gender ideology
neoliberal ideology
critical pedagogy
manuali LS
italiano LS
serbo LS
moda e abbigliamento
ideologia di genere
ideologia neoliberale
pedagogia critica

Opis:

This paper aims to analyse the elements of gender ideology and neo-liberal ideology in a corpus composed of three Italian and two Serbian as a foreign language textbooks. The focus of the study is centered on the representation of activities related to the purchase of clothes and accessories, analysed from the perspective of Critical Discourse Analysis. The results indicate that neoliberal values are sustained through the idea that women are naturally predisposed to be clothes and fashion consumers. On a broader scale, the results implicate that the educational materials taken into examination lack a critical pedagogy approach, and that they do not employ the critical and the transformative potential of education, instead they are limited to the reproduction of dominant ideologies.
Il presente contributo si propone di analizzare gli elementi dell’ideologia di genere e dell’ideologia neoliberale nei manuali per l’insegnamento delle lingue straniere. Il corpus è composto da tre manuali di italiano LS e due manuali di serbo LS adottati nella didattica delle lingue straniere presso l’Università di Banja Luka, Bosnia ed Erzegovina. Il focus dell’analisi è centrato sulla rappresentazione delle attività relative all’acquisto di capi di abbigliamento. Il modello tridimensionale di Norman Fairclough, al cui interno l’analisi delle pratiche discorsive è articolata in tre tappe – descrizione, interpretazione, spiegazione – costituisce il punto di riferimento metodologico. La prima tappa dell’analisi consiste nell’individuazione delle sequenze testuali e illustrative in cui sono denotate le attività relative all’acquisto di capi di abbigliamento, mentre nelle fasi di interpretazione e spiegazione si mette in luce la natura ideologica del discorso educativo. I risultati mostrano che sia nei manuali di serbo LS che in quelli di italiano LS la rappresentazione dell’acquisto di capi di abbigliamento è caratterizzata dalla differenziazione di genere, evidente nella scelta di rendere esclusivamente i personaggi femminili protagonisti di quest’attività. L’immaginario stereotipato della moda e dello shopping in cui a consumare è solo e sempre la donna, rafforzato dal messaggio che implica che l’acquisto di abbigliamento è uno dei modi per soddisfare gli standard di bellezza e aumentare la percezione positiva di sé, conferma il sovrapporsi delle due ideologie, ovvero dimostra come gli stereotipi di genere vengono sfruttati e capitalizzati dalle dinamiche del consumo nel settore della moda e dell’abbigliamento. Siccome né gli stereotipi di genere né i valori neoliberali vengono capovolti per offrire modelli alternativi ed equilibrati, si evince che i manuali del corpus non mettono in atto il potenziale trasformativo dell’educazione.

Źródło:

Italica Wratislaviensia; 2023, 14.1; 141-161
2084-4514

Pojawia się w:

Italica Wratislaviensia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Testing the results of a passenger vehicle collision with a rigid barrier

Autorzy:

Borkowski, W.
Hryciów, Z.
Rybak, P.
Wysocki, J.

Powiązania:

https://bibliotekanauki.pl/articles/245925.pdf

Data publikacji:

2010

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

road safety barrier
crash tests
computer simulation
LS-DYNA

Opis:

High accident index in Poland, including one of the highest death rates in EU, forces undertaking the intense works in order to improve traffic safety. Published road accident statistics indicate that the most dangerous accidents include a vehicle collision with a tree, post or other road object. The road safety barriers make the road infrastructure elements that can signiflcantly protect against that type of accidents. The work presents basie tasks and requirements imposed on the barriers. Problems related to a proper selection of the barriers have been also highlighted. The tools facilitating the barrier design include numerical modelling. The modelling has been done by means of the LS-DYNA software, using the finite element method. A general structure and a developed barrier model as well as vehicle model have been presented. The conditions of the numerical tests have been also specifled. The work presents the results of influence of car impact angle with a rigid safety barrier. Presented results refer to a car o f mas s of 900 kg, making a bas is for the tests of the limiting systems for several limiting levels: including normal limit N2 (according to EN 1317-2). Compared to standard requirements, the scope of numerical tests has been extended by other car impact angle values. The work presents vehicle trajectories and deformations of their bodies. It also includes examples of velocities and acceleration courses and acceleration severity indexes (ASI) calculated on their basis. Obtained results indicate that the barrier location angle has a high influence on the safety level ofthe car passengers as well as on the car motion trajectory after collision

Źródło:

Journal of KONES; 2010, 17, 1; 51-57
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Numerical simulation of the standard TB11 and TB32 tests for a concrete safety barrier

Autorzy:

Borkowski, W.
Hryciów, Z.
Rybak, P.
Wysocki, J.

Powiązania:

https://bibliotekanauki.pl/articles/247654.pdf

Data publikacji:

2010

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

road safety barrier
crash tests
computer simulation
LS-DYNA

Opis:

The work presents the traffic safety issue related to a use of the road protective barriers. It describes a purpose and tasks that should be fulfilled by the safety system. Conditions of crash tests and their evaluation according to the requirements of the existing standard documents are also presented. The purpose of the work was to evaluate the influence of applied barrier type on the car collision process. A barrier composed of the segments that can move on the ground due to the impact force and a barrier fixed to the road surface were assumed for the model tests. The modelling was carried out by means of the LS-DYNA sofrware, using the finite element method. The tests were performed for two types of cars, mass of 900 kg and 1500 kg. The work includes the numerical test results, deformations of car bodies and barrier displacement. Examples of velocities and acceleration courses of selected vehicle elements and the ASI index, calculated on their basis, used for evaluation of the passenger danger level were also presented. Obtained results indicate a significant influence of the barrier installation method (joint with the road) on the collision process course and dynamic loads affecting the car passengers. They also indicate directions of safety improvement.

Źródło:

Journal of KONES; 2010, 17, 4; 63-71
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Magneto-Optical Study Toward Discrimination of Iron Mineral in Human Tissues

Autorzy:

Koralewski, M.
Żurawski, J.
Langkammer, C.
Karoń, J.
Haybaeck, J.

Powiązania:

https://bibliotekanauki.pl/articles/1030495.pdf

Data publikacji:

2018-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

87.15.-v
87.64.Ni
78.20.Ls

Opis:

Magnetic optical rotatory dispersion (MORD) of thin selected biological tissues and thin film of composite made from akaganeite mineral and PVA as well as ferritin and their mimetics aqueous suspensions were performed in spectral range 250-650 nm at room temperature. Good correlation between MORD spectra for akaganeite composite film, ferritin and their mimetics aqueous suspensions with spectra of thin slices of human tissue obtained from white matter of the brain and spleen were observed. Comparison suggest a contribution from Fe(III) to MORD spectra of tissues. This preliminary results show that application of MORD spectroscopy to clinical analysis may be useful.

Źródło:

Acta Physica Polonica A; 2018, 133, 3; 742-744
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Numerical calculations of behaviour of ship double-bottom structure during grounding

Autorzy:

Niklas, K.

Powiązania:

https://bibliotekanauki.pl/articles/963390.pdf

Data publikacji:

2008

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

numerical simulation
grounding
collision
CORET project
LS-DYNA software

Opis:

The idea of the CORET project consists in adding, to the existing construction, special polymer-concrete coatings intended for the increasing of ship’s capability against losing structural tightness during collision or grounding. In order to correctly design the protective barriers, to perform relevant numerical simulations is necessary. The elaborating of numerical models of ship structure behaviour during collision is very complicated and requires auxiliary simulations (on submodels) to be performed. This paper is devoted to elaborating a numerical model of a fragment of ship double-bottom structure. On the basis of experimental tests it was possible to verify and calibrate the numerical model which may be used in further design work aimed at the increasing of crashworthiness of structure during collision.

Źródło:

Polish Maritime Research; 2008, S 1; 22-26
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Preventive use of Lactobacillus plantarum LS/07 and inulin to relieve symptoms of acute colitis

Autorzy:

Hijová, Emília
Šoltésová, Alena
Salaj, Rastislav
Kuzma, Jozef
Strojný, Ladislav
Bomba, Alojz
Gregová, Kristína

Powiązania:

https://bibliotekanauki.pl/articles/1039004.pdf

Data publikacji:

2015

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

colitis
Sprague-Dawley rats
inulin
Lactobacillus plantarum LS/07

Opis:

The aim of presented study was to investigate the influence of Lactobacillus plantarum LS/07 and inulin on the activity of β-glucuronidase enzyme, and counts of coliform and lactobacilli in fresh caecal digesta, cytokine levels (IL-6, IL-8), and trancription nuclear factor kappa beta (NFκB) activities in colon tissue and blood samples of rats with dextran sulphate sodium (DSS) induced acute colitis. The rats were randomly divided into four groups - CG, AC, AC+PRE and AC+PRO. Colitis was induced using of 5% DSS in drinking water for 7d. DSS application increased activity of β-glucuronidase (P < 0.001), increased counts of coliforms, and decreased lactobacilli counts (P < 0.05) in comparison to control group. Serum and tissue levels of IL-6 and IL-8 as well as tissue NFκB activities showed increased expression in acute colitis group. Inulin diet modified counts of microorganims and decreased β-glucuronidase activity, suppressed NFκB activities (P < 0.001) and down regulate synthesis of IL-6 (P < 0.01) in serum and colon tissue and tissue IL-8 (P < 0.05). Lactobacillus plantarum LS/07 decreased β-glucuronidase activity (P < 0.05), levels of IL-6 and IL-8 (P < 0.001). These results were consistent with the addition of histological findings. Our results indicate that dietary intake of Lactobacillus plantarum LS/07 and inulin suppressed expression observed markers, which play an important role in the inflammatory process, which predisposes their use in prevention or treatment of acute colitis.

Źródło:

Acta Biochimica Polonica; 2015, 62, 3; 553-557
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Anisotropic Magnetic Properties of MilledBearing Steel Surface

Autorzy:

Mičica, M.
Blažek, D.
Hadzima, B.
Pištora, J.
Neslušan, M.

Powiązania:

https://bibliotekanauki.pl/articles/1192261.pdf

Data publikacji:

2015-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Bb
75.60.Ej
78.20.Ls

Opis:

For many reasons, the steel surfaces are machined to obtain required physical properties. Suitable methods are required for the management and control of the manufacturing processes, which are simultaneously sufficiently robust and sensitive. The non-destructive testing methods, sensitive to the magnetic properties of the surface, are very suitable for this purpose. The Barkhausen noise (BN) measurement, which reveals the discontinuous movement of the magnetic domains in the thin surface layer during magnetisation reversal process is very robust, while magneto-optical Kerr effect (MOKE) method, using polarized light for orientation measurements of magnetic domains at the surface, is very sensitive and provides detailed information about hysteresis curves (HC) of the materials. In this contribution our results obtained on the milled 100Cr6 bearing steel are presented. These properties were obtained by MOKE laboratory measurements and bring very interesting facts about the magnetisation reversal process, which depends on the orientation of the magnetic field with respect to the cutting direction. Our results clarify the strong anisotropy of BN, which is observed during the industrial application of this method.

Źródło:

Acta Physica Polonica A; 2015, 127, 4; 1421-1423
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Two-Dimensional Optical Imaging of Artificial Magnetic Field in the Laboratory

Autorzy:

Li, X.
An, N.
Feng, X.
Bai, J.

Powiązania:

https://bibliotekanauki.pl/articles/1400280.pdf

Data publikacji:

2013-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

42.25.Ja
42.30.-d
78.20.Ls

Opis:

Two-dimensional images of the artificial magnetic field created by permanent magnets were obtained by means of the Faraday magnetic rotation effect. This provides a convenient and effective means to observe and measure macro-scale magnetic field, as well as lays a base for three-dimensional optical imaging of magnetic field. The magnetic field imaging here can also be considered as a key part of the magnetic rotation geomagnetic field imaging method which we put forward before, and will provide experimental support for this method.

Źródło:

Acta Physica Polonica A; 2013, 123, 1; 34-38
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Magnetic Birefringence Study of the Magnetic Core Structure of Ferritin

Autorzy:

Koralewski, M.
Pochylski, M.
Mitróová, Z.
Melníková, L.
Kováč, J.
Timko, M.
Kopčanský, P.

Powiązania:

https://bibliotekanauki.pl/articles/1428622.pdf

Data publikacji:

2012-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
87.15.-v
87.85.jf

Opis:

Magnetically induced optical birefringence (Δ n) was measured for magnetoferritin and horse spleen ferritin aqueous suspensions. The Δ n for magnetoferritin was described in the frame of the Langevin formalism taking into account distribution of core diameter. The established average magnetic dipole moment and core diameter is equal to about 460 $μ_{B}$ and 3 nm, respectively. It was shown that magnetic birefringence and the Cotton-Mouton constant can be powerful parameters in identification of the magnetic core structure of ferritin, especially useful in biomedicine.

Źródło:

Acta Physica Polonica A; 2012, 121, 5-6; 1237-1239
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Ellipsometric Selective Sensitivity to Magnetic Nanostructures

Autorzy:

Hamrlová, J.
Postava, K.
Životský, O.
Hrabovský, D.
Pištora, J.
Švec, P.
Janičkovič, D.
Maziewski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1534105.pdf

Data publikacji:

2010-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
75.50.Bb
75.60.-d

Opis:

Recently, we have shown that the approach of depth sensitivity of magneto-optic ellipsometry can be generalized to selectivity from different materials in nanostructures. We use the condition number as the figure of merit to quantify the magneto-optic selectivity to two different magnetic contributions in magnetic nanostructure. The method is demonstrated on nanostructures containing magnetically hard Fe particles in surface layer of soft FeNbB amorphous ribbon. We separated both magnetic contributions from measurement of hysteresis loops using magneto-optic Kerr effect in longitudinal configuration. Magneto-optic selectivity is discussed and theoretical model on the basis of effective medium is compared with experimental data of longitudinal magneto-optic Kerr effect depending on angle of incidence.

Źródło:

Acta Physica Polonica A; 2010, 118, 5; 837-839
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Magnetotransmission Measurements of Intra-Shallow-Donor Transitions in Semi-Insulating GaAs

Autorzy:

Karpierz, K.
Kożuchowski, K.
Grynberg, M.

Powiązania:

https://bibliotekanauki.pl/articles/1920976.pdf

Data publikacji:

1992-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.40.+w
78.20.Ls
78.50.Ge

Opis:

In this paper we present the results of an investigation of the 1s-2p$\text{}_{+}$ intra-shallow-donor transition by means of an extremely difficult magnetotransmission experiment performed on semi-insulating GaAs. We report the temperature dependence of the transition intensity. We noticed the absence in the absorbance spectra of a well-pronounced structure which is observed at low magnetic fields in photoconductivity measurements. The results are discussed in terms of a fluctuating potential from ionized centres in semi-insulating GaAs.

Źródło:

Acta Physica Polonica A; 1992, 82, 4; 617-619
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Formation of Nanostructured Layers for Passivation of High Power Silicon Devices

Autorzy:

Šalucha, D.
Šimkiene, I.
Sabataityte, J.

Powiązania:

https://bibliotekanauki.pl/articles/1813481.pdf

Data publikacji:

2008-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

85.30.Kk
85.40.Ls
81.05.Rm

Opis:

Nanocrystalline porous silicon films, which have been formed by using simple wet electrochemical etching process in HF electrolyte, were applied for passivation of high power silicon diodes. An optimal technology was designed to manufacture a uniform layer of porous silicon over the area of the p-n junction. The 8% increase in the yield was achieved onO100 mm diameter wafers with 69 cells of diodes in each, by using a very simple technology for the formation of porous layer for passivation of high power silicon diodes.

Źródło:

Acta Physica Polonica A; 2008, 113, 3; 1079-1083
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Magnetooptical Analysis of Interface Mixing in Pulsed Laser Evaporation and Epitaxy Grown CdTe/Cd$\text{}_{0.9}$Mn$\text{}_{0.1}$Te Multiple Quantum Well and Superlattice

Autorzy:

Lewalski, A.
Nguyen, The Khoi
Kossacki, P.
Gaj, J. A.
Dubowski, J. J.

Powiązania:

https://bibliotekanauki.pl/articles/1929672.pdf

Data publikacji:

1993-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.20.Dx
78.20.Ls
75.50.Pp

Opis:

A recently proposed magnetooptical method of determination of interface mixing was applied to CdTe/CdMnTe superstructures grown by pulsed laser evaporation and epitaxy. Diffusion length were found ≈ 5 Å for a multiple quantum well and > 15 Å for a superlattice. Ranges of Mn mole fractions and well width values enabling efficient application of the method were determined.

Źródło:

Acta Physica Polonica A; 1993, 84, 3; 571-574
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Photovoltaic Effect on PbTe p-n Junction in the Presence of Magnetic Field

Autorzy:

Le Van, Khoi
Grodzicka, E.
Witkowska, B.
Story, T.
Gałązka, R. R.

Powiązania:

https://bibliotekanauki.pl/articles/1929738.pdf

Data publikacji:

1993-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.25.Tn
78.20.Ls
72.80.Ga

Opis:

Photovoltaic spectra of PbTe p-n junction have been measured in the infrared spectral region in the temperature range of 8-260 K. The p-n junctions have been formed by cadmium diffusion into the p-type PbTe crystals. From the positions of the photovoltaic maxima the energy gap of the diode material has been determined. In the presence of a magnetic field up to 7 T, a pronounced oscillatory behavior of the photovoltage was observed in the Faraday and Voigt configurations. Experiments were performed as a function of the magnetic field intensity at a constant wavelength of the incident light. The energy of the interband magnetooptical transitions between the Landau levels in PbTe was determined and compared with the theoretical model of Adler, describing the energy band structure for the IV-VI compounds.

Źródło:

Acta Physica Polonica A; 1993, 84, 4; 721-724
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Ground Shallow Donor State of III-V Compounds for Arbitrary Magnetic Field

Autorzy:

Obuchowicz, A.
Własak, J.

Powiązania:

https://bibliotekanauki.pl/articles/1921601.pdf

Data publikacji:

1992-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
61.50.Em
71.55.-i

Opis:

Theory of shallow donor in III-V semiconductors in the presence of magnetic field is reinvestigated. Considerations are performed within the 3-level Kane model. In order to avoid singularities caused by the Coulomb potential we divide it into short- and long-range components. The latter one is the slowly varying potential and contrary to the Coulomb potential it satisfies all demands for envelope function equation. The short-range part is contributing to a chemical shift. Calculation of energies of two possible spin states of ground donor level are then performed using variational method.

Źródło:

Acta Physica Polonica A; 1992, 82, 4; 693-696
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Mechanism of Optical Detection of Magnetic Resonance in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te

Autorzy:

Godlewski, M.
Surma, M.
Gałązka, R. R.
Nguyen, The Khoi
Gisbergen, S.J.C.H.M.
Gregorkiewicz, T.
Ammerlaan, C. A. J.

Powiązania:

https://bibliotekanauki.pl/articles/1921620.pdf

Data publikacji:

1992-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

76.70.Hb
75.50.Pp
78.20.Ls

Opis:

The photoluminescence and optically detected magnetic resonance studies of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (x = 0.095) are presented. The Mn$\text{}^{2+}$ magnetic resonance is detected optically via the changes of "edge" emission induced by the decrease of the Mn spin system magnetization.

Źródło:

Acta Physica Polonica A; 1992, 82, 4; 717-719
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Spin-Lattice Relaxation of CdMnTe, Measured with a Pick-up Coil in a High Magnetic Field

Autorzy:

Strutz, T.
Witowski, A.
Wyder, P.

Powiązania:

https://bibliotekanauki.pl/articles/1927546.pdf

Data publikacji:

1991-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

76.30.-v
78.20.Ls
78.47.+p

Opis:

The spin-lattice relaxation (SLR) time of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te with x=0.008 is measured directly under electron spin resonance condition in a magnetic field of 8.9 T, using a pick-up coil. The SLR times are measured for different sample temperatures between 3.0K and 35K and compared with data of a more diluted sample with x=0.002. The SLR times are shorter than expected for single spin SLR. Moreover, the temperature dependence of the SLR time does not show any of the characteristic behaviours for single spin SLR. Thus, the observed SLR times are explained by cross relaxation of single spins with spin clusters.

Źródło:

Acta Physica Polonica A; 1991, 79, 1; 149-153
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Magneto-Optical Characteristics of Human Serum

Autorzy:

Surma, M.
Bućko, J.
Bąk, G.
Ciszek, M.

Powiązania:

https://bibliotekanauki.pl/articles/2014394.pdf

Data publikacji:

2000-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

42.25.Lc
78.20.Ek
78.20.Ls

Opis:

A study of magneto-optical circular birefringence of human serum from healthy subjects and cancer patients was performed. Significant differences in the magnetic field induced change of the natural optical activity of serum from healthy blood donors and neoplasmic patients were noted. The natural optical activity of blood is positive, irrespective of the donor health status, whereas the magnetic field induced (B > 10T) change in the natural optical activity of the serum from cancer patients is negative while that from healthy donors is positive. The value and sign of the characteristic magneto-optical marker of human serum was discovered in a study of the influence of very high magnetic fields on chiral media and interpreted on the basis of the recent developments in the theory of magnetic field induced optical circular birefringence in the media revealing natural optical activity. The blood serum is a chiral medium.

Źródło:

Acta Physica Polonica A; 2000, 98, 5; 533-542
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Quantum Dots - Theory for Experiments

Autorzy:

Jacak, L.
Krasnyj, J.
Wójs, A.

Powiązania:

https://bibliotekanauki.pl/articles/1967993.pdf

Data publikacji:

1997-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.20.Dx
71.35.Ji
78.20.Ls

Opis:

A simple model based on the effective-mass method and treating a quantum dot as a small irregularity of the periodic crystal field is developed and used for the description of the radiative recombination of an exciton captured in that quasi-zero-dimensional structure. The additional peaks appearing in the photoluminescence spectra at the critical quantum dot size are predicted as a consequence of the metastable excited states occurring in the energy spectrum of a confined exciton. The obtained dependence of the photoluminescence spectrum on the dot size and magnetic field reproduces well the available experimental results.

Źródło:

Acta Physica Polonica A; 1997, 92, 4; 633-640
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Exchange Parameters of CdCrS Semimagnetic Semiconductor

Autorzy:

Herbich, M.
Mac, W.
Twardowski, A.
Ando, K.
Demianiuk, M.

Powiązania:

https://bibliotekanauki.pl/articles/1968099.pdf

Data publikacji:

1997-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
71.70.Gm
78.30.Fs

Opis:

Free exciton magnetoreflectance and magnetization of Cd$\text{}_{1-x}$Cr$\text{}_{x}$S (0.0024 < x < 0.0031) were measured at T = 2.0 K and magnetic field up to 5 T. Combining the heavy hole exciton splitting with the magnetization data the exchange integral N$\text{}_{0}$β = +0.46±0.04 eV was evaluated within the framework of mean field approximation.

Źródło:

Acta Physica Polonica A; 1997, 92, 4; 774-776
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Magnetotransport and Magnetooptics of InAs$\text{}_{1-x}$Sb$\text{}_{x}$ and Heterojunctions Combinations Formed Between InAs and GaSb, AlSb Or InAs$\text{}_{1 -x}$Sb$\text{}_{x}$

Autorzy:

Stradling, R. A.

Powiązania:

https://bibliotekanauki.pl/articles/1968244.pdf

Data publikacji:

1997-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.20.My
76.40.+b
78.20.Ls

Opis:

Cyclotron resonance and interband measurements are reported in magnetic fields up to 160 T for InAs/InAs$\text{}_{1-x}$Sb$\text{}_{x}$ superlattices, one of which is a "self-organised" or "natural" superlattice, and InAs$\text{}_{1-x}$Sb$\text{}_{x}$ epilayers. The samples were grown by MBE at temperatures between 370°C to 500°C. No dependence of the band gap, effective masses or g-values on the growth temperature was detected. Anomalous tilt behaviour was observed for the superlattices. Inversion asymmetry induced spin-splitting of the subbands in gated InAs quantum wells is investigated by means of the Shubnikov-de Haas effect and cyclotron resonance. The non-parabolicity was well fitted by Kane theory, although the measured values of effective mass were substantially higher than predictions. Infrared life time measurements at wavelengths between 6 and 85 microns are undertaken with free electron lasers on InAs/InAs$\text{}_{1-x}$Sb$\text{}_{x}$ superlattices and InAs/AlSb quantum wells. Suppression of the Auger recombination times is demonstrated with the superlattices.

Źródło:

Acta Physica Polonica A; 1997, 92, 5; 851-865
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

Temperature Dependence of Energy Gap of Highly Concentrated Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te(0.6 < x ≤ 1.0) Epilayers

Autorzy:

Stachow, A.
Mac, W.
Nguyen, The Khoi
Twardowski, A.
Karczewski, G.
Janik, E.
Wojtowicz, T.
Kossut, J.

Powiązania:

https://bibliotekanauki.pl/articles/1934002.pdf

Data publikacji:

1995-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.40.Fy
75.25.+z
78.20.Ls

Opis:

The temperature dependence of the energy gap of MBE grown Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (0.6 < x ≤ 1.0) was measured for 2 K ≤ T ≤ 200 K and B ≤ 5 T. The results are interpreted in the frames of the model predicting that the exchange contribution to the band edge shift is proportional to the product of the magnetic susceptibility and the temperature.

Źródło:

Acta Physica Polonica A; 1995, 88, 5; 913-916
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Magnetooptics of III-V Compounds in Many Band Model Approach

Autorzy:

Obuchowicz, A.
Wlasak, J.

Powiązania:

https://bibliotekanauki.pl/articles/1886749.pdf

Data publikacji:

1991-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
61.50.Em
71.55.-i

Opis:

III-V semiconducting compounds in the presence of a magnetic field are considered. The 14 x 14 effective hamiltonian in the frame of 5-level model is obtained. Directional dependence of selection rules are obtained. Shallow donor levels in the frame of spherical 3-level model are also considered. New trial functions suitable for a whole range of magnetic field are proposed. It is found that the energy as well as the variational function of each magnetodonor level is a continuous function of the magnetic field.

Źródło:

Acta Physica Polonica A; 1991, 79, 2-3; 329-332
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Persistent Spin Resonance of Donor Electrons and Hopping Magnetoconductivity in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$

Autorzy:

Wojtowicz, T.
Semaltianos, N.
Kłosowski, P.
Dobrowolska, M.
Furdyna, J. K.
Miotkowski, I.

Powiązania:

https://bibliotekanauki.pl/articles/1890647.pdf

Data publikacji:

1991-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
71.25.Jd
72.20.My

Opis:

The first observation of electric dipole spin resonance of donor electrons in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ in far-infrared magnetotransmission is reported. Modification of the donor wave function due to non-diagonal exchange interaction with localized magnetic moments and to magnetic fluctuations are believed to allow this resonance. Hopping magnetoconductivity studied in the same crystals shows a behavior typical for wide gap diluted magnetic semiconductors.

Źródło:

Acta Physica Polonica A; 1991, 80, 2; 287-290
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

The Relaxation of Mn Pairs in CdMnTe at High Magnetic Fields

Autorzy:

Strutz, T.
Witowski, A. M.
Wyder, P.

Powiązania:

https://bibliotekanauki.pl/articles/1890763.pdf

Data publikacji:

1991-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

76.30.-v
78.20.Ls
78.47.+p

Opis:

The spin-lattice relaxation in CdMnTe at 4.7 K has been measured at high magnetic fields up to 24.5 T. At fields, where the ground state of nearest-neighbor exchange coupled Mn pairs changes due to energy level crossing, an increase in the relaxation rate is observed. This is attributed to the change of relaxation of nearest-neighbor Mn pairs. It proves that not only large size Mn clusters are involved in the relaxation as it has been shown previously, but also Mn pairs. It shows as well that the mixing of pair states is quite effective.

Źródło:

Acta Physica Polonica A; 1991, 80, 3; 313-316
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 58.

Tytuł:

SQUID Magnetometry and Magneto-Optics of Epitaxial EuSe

Autorzy:

Rumpf, K.
Granitzer, P.
Kellner, W.
Kirchschlager, R.
Janecek, S.
Pascher, H.
Krenn, H.

Powiązania:

https://bibliotekanauki.pl/articles/2038138.pdf

Data publikacji:

2004-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Pp
78.20.Ls
07.55.Jg

Opis:

The complicated (H,T)-magnetic phase diagram of EuSe is caused by the critical balance between nearest and next nearest neighbour exchange interaction (J$\text{}_{NN}$=0.119 K and J$\text{}_{NNN}$=-0.1209 K) and leads to various spin arrangements NNSS..., NSN..., NNS, NNN... [NS denotes opposite ferromagnetic order in adjacent (111) planes]. Beside the subtle local exchange of 5d-t$\text{}_{2g}$ electrons and localized holes with neighbouring Eu-4f spins, obviously also the strain status influences the occurrence of these different phases. We investigate the magnetic ordering phenomenon in a strained 2.5 μm EuSe film on BaF$\text{}_{2}$ substrate by SQUID magnetometry and magneto-optics like spectral Faraday- and Kerr-effect measurements for temperatures from 2 K up to 200 K and for magnetic fields up to 5 T. The magneto-optical probe monitors the local environment of the photoexcited electron-hole pair, called magnetic exciton, located within a ferromagnetic surrounding (photoinduced magnetic polaron), whereas the integral magnetization measured by SQUID is most sensitive to long-range magnetic ordering. In spite of the dissimilarity of measurement techniques we find an influence of the long-range magnetic order (e.g. of the NNS- or NNN-matrix) on the non-resonant Kerr reflection. The complementarity of SQUID and magneto-optical methods is stringent only in the (resonant) spectral regime, where magnetic polarons are formed.

Źródło:

Acta Physica Polonica A; 2004, 105, 6; 621-629
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 59.

Tytuł:

Magnetized Plasma in Polar Semiconductors

Autorzy:

Wysmołek, A.

Powiązania:

https://bibliotekanauki.pl/articles/2047367.pdf

Data publikacji:

2007-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.30.Fs
73.20.Mf
78.20.Ls

Opis:

Plasma excitations in metallic n-type GaAs are studied in high-magnetic fields using the method of inelastic light scattering (the Raman scattering). Experimental data are analyzed using a standard, dielectric function theory. The results obtained for samples with a high electron concentration are well understood in terms of longitudinal excitations. A strong interaction of coupled longitudinal optical-phonon-plasmon modes with the collective cyclotron resonance excitations (the Bernstein modes) is observed. In samples with a lower electron concentration, the unexpected feature in the vicinity of the undressed optical phonon is observed at high magnetic fields. This effect is explained in terms of transverse excitations, which would appear in the Raman spectrum due to disorder-activated selection-rule breaking. A field induced metal-insulator transition and magnetopolaron effect on shallow donors in GaAs is shown to be traced with the Raman scattering experiments in samples with the lowest electron concentration.

Źródło:

Acta Physica Polonica A; 2007, 112, 2; 141-152
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 60.

Tytuł:

Optical and Magnetooptical Properties of Clinical Dextrans

Autorzy:

Koralewski, M.
Reinholz, F.
Karoń, J.
Waraczewski, K.

Powiązania:

https://bibliotekanauki.pl/articles/2047896.pdf

Data publikacji:

2007-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ek
78.20.Ls
81.05.Lg

Opis:

The effect of dextran concentration, pH, temperature, and urea on the conformation of dextran chain in saline solution were studied. Two characteristic concentrations for both dextrans were observed. One with c$\text{}_{1}$≈0.02 g/dL and second with c$\text{}_{2}$∼2 g/dL which may be related with aggregation and overlapping processes of polymer chains, respectively. The mean optical polarizability for dextran polysaccharides were discussed in relation to their radius of gyration. Preliminary results of the Faraday effect dispersion and their temperature dependence is also presented.

Źródło:

Acta Physica Polonica A; 2007, 112, 5; 1119-1124
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 61.

Tytuł:

Beyond the Virtual Crystal Approximation in Diluted Magnetic Semiconductors

Autorzy:

Tworzydło, J.

Powiązania:

https://bibliotekanauki.pl/articles/1873004.pdf

Data publikacji:

1995-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.70.Gm
78.20.Ls
71.55.Gs

Opis:

We present a new model approach which goes beyond the virtual crystal approximation and the molecular field approximation in the description of the spin splitting of band states in diluted magnetic semiconductors. The theory is formulated within a one-band effective mass approximation and explicitly takes into account a chemical and magnetic disorder caused by substitutional ions. The results confirm the apparent dependence of the p-d exchange integral on x in Cd$\text{}_{1-x}$Mn$\text{}_{x}$S for small concentrations of Mn ions and we predict the asymmetric field and temperature dependence of the spin splitting in this compound.

Źródło:

Acta Physica Polonica A; 1995, 87, 2; 391-394
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Optical Properties of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te Crystals near Fundamental Absorption Edge in Transverse Magnetic Fields

Autorzy:

Safonova, L.
Brazis, R.
Narkowicz, R.

Powiązania:

https://bibliotekanauki.pl/articles/2041745.pdf

Data publikacji:

2005-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Pp
78.20.Ci
78.20.Ls

Opis:

A simple and convenient model is proposed to elucidate the optical characteristics of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te crystals using experimental data on light reflection in magnetic field. The model is based on the quasi-oscillator concept accounting both for the exciton and fundamental absorption edge contributions. The energy dependencies of refraction index and absorption coefficient are presented for Mn mole fraction x=20% at the magnetic field values up to 5 T.

Źródło:

Acta Physica Polonica A; 2005, 107, 2; 267-270
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 63.

Tytuł:

Infrared Spectroscopy of GaAs Doped with Mn

Autorzy:

Rutkowska, A.
Wasik, D.
Witowski, A.
Sadowski, M.
Orłowski, W.
Strzelecka, G.
Hruban, A.
Kamińska, M.
Twardowski, A.
Potemski, M.

Powiązania:

https://bibliotekanauki.pl/articles/2044531.pdf

Data publikacji:

2005-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.70.Ej
78.20.Ls
78.30.Fs

Opis:

We found that the fine structure related to Lyman spectra of [Mn$\text{}^{2+}$(d$\text{}^{5}$) + a hole] centers in GaAs was present only for samples with low Mn concentration. Such samples, at low temperature, did not show any hopping conductance within Mn impurity band. Magnetooptical measurements revealed that magnetic field induced splitting of the Lyman optical transitions was larger than Zeeman splitting observed for typical shallow acceptors in GaAs, like Be, Zn, and C. This experimental result proved that in the case of Mn acceptor impurity, the exchange coupling of a hole and the S = 5/2 Mn$\text{}^{2+}$(d$\text{}^{5}$) core could not be neglected, which was in accordance with the [Mn$\text{}^{2+}$(d$\text{}^{5}$) + a hole] model of the neutral Mn center in GaAs.

Źródło:

Acta Physica Polonica A; 2005, 108, 5; 845-849
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 64.

Tytuł:

Self-Induced Persistent Photoconductivity in ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ Heterojunctions

Autorzy:

Van Khoi, Le
Dobrowolski, W.
Zakrzewski, A.
Dobaczewski, L.
Gałązka, R. R.

Powiązania:

https://bibliotekanauki.pl/articles/1952039.pdf

Data publikacji:

1996-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.25.Tn
78.20.Ls
72.80.Ga

Opis:

At temperatures lower than 200 K the photomemory effect has been observed in ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ heterojunctions. The persistent photoconductivity can be achieved either by illumination from an external light source or by a self-absorption of the electroluminescence radiation when a voltage of about 10 V for a few seconds is applied to the diode. Current-voltage characteristics are of the form I~ V$\text{}^{m}$. The capacitance and electroluminescence measurements show that the photomemory effect in ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$ Te$\text{}_{1-y}$Se$\text{}_{y}$ heterojunctions can be caused by the bistable nature of the In dopant in the Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ substrate. In the high resistivity interface layer and the substrate material indium forms centers similar to DX-like centers in Zn$\text{}_{x}$Cd$\text{}_{1-x}$Te and Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te.

Źródło:

Acta Physica Polonica A; 1996, 90, 5; 883-886
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 65.

Tytuł:

Faraday Rotation in Multiple Quantum Wells of GaAs/AlGaAs

Autorzy:

Dudziak, E.
Bożym, J.
Pruchnik, D.
Wasilewski, Z. R.

Powiązania:

https://bibliotekanauki.pl/articles/1952529.pdf

Data publikacji:

1996-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
73.20.Dx
78.66.Fd

Opis:

We report on the results of first measurements of the Faraday rotation of modulated n-doped multiple quantum wells of GaAs/Al$\text{}_{x}$Ga$\text{}_{1-x}$As (x = 0.312). The measurements have been performed in the magnetic fields up to 13 T at the temperature of 2 K, in the spectral region of interband transitions. A rich structure of magneto-excitons has been found in the measured spectra. Faraday rotation (phase) measurements are proposed as an alternative method to photoluminescence excitation for investigations of magneto-excitons in quantum wells. The dependence of the measured Faraday rotation on magnetic field and hypothetical connections with quantum Hall effect are also discussed.

Źródło:

Acta Physica Polonica A; 1996, 90, 5; 1022-1026
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 66.

Tytuł:

Magnetic Polaron Formation in Semimagnetic Semiconductor Heterostructures

Autorzy:

Yakovlev, D. R.

Powiązania:

https://bibliotekanauki.pl/articles/1947113.pdf

Data publikacji:

1996-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
71.35.+z
75.50.Rr

Opis:

We present a survey of experimental and theoretical studies of exciton magnetic polarons in semimagnetic semiconductor epilayers, quantum wells and superlattices. The emphasis is on dynamical aspects of magnetic polaron formation in systems of different dimensionality.

Źródło:

Acta Physica Polonica A; 1996, 90, 4; 703-714
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 67.

Tytuł:

Photovoltaic Effect of ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ Heterojunctions in Presence of Magnetic Field

Autorzy:

Gałązka, R. R.
Nguyen, The Khoi
Khoi, Le Van
Dobrowolski, W.
Witkowska, B.
Mycielski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1933917.pdf

Data publikacji:

1995-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.25.Tn
78.20.Ls
72.80.Ga

Opis:

Photovoltaic effect of the ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ heterojunctions, prepared by vapor-transport epitaxy of ZnTe on Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ substrate was studied. The photovoltaic measurements were carried out over the temperature range from 12 K to 300 K and in the magnetic field up to 6 T. In the magnetic field, maximum of the sensitivity corresponding to the energy of the forbidden gap of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ substrate splits into two components for σ$\text{}^{+}$ and σ¯ circular polarizations of incident light. This phenomenon was ascribed to the exchange interaction of the magnetic moments of Mn$\text{}^{++}$ ions with band electrons. From the value of the splitting energy the exchange integral N$\text{}_{0}$(α-β) was determined to be 1.15 ± 0.2 eV.

Źródło:

Acta Physica Polonica A; 1995, 88, 5; 841-844
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 68.

Tytuł:

Exciton Magneto-Optical Study on Single Quantum Wells, Cd$\text{}_{1-x}$Zn$\text{}_{x}$Te/Cd$\text{}_{1-x'-y}$Zn$\text{}_{x}$'Mn$\text{}_{y}$Te

Autorzy:

Takeyama, S.
Grabecki, G.
Adachi, S.
Takagi, Y.
Wojtowicz, T.
Karczewski, G.
Kossut, J.

Powiązania:

https://bibliotekanauki.pl/articles/1934045.pdf

Data publikacji:

1995-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.55.-m
78.20.Ls
78.66.Hf

Opis:

Four-single quantum wells composed of the ternary non-magnetic compounds Cd$\text{}_{0.93}$Zn$\text{}_{0.07}$Te (well width = 13, 19, 40, 90 Å), separated by the quaternary magnetic-compound Cd$\text{}_{0.48}$Zn$\text{}_{0.04}$Mn$\text{}_{0.48}$Te on (100)GaAs substrate were grown by MBE, and exhibited clear and distinctive photoluminescence lines corresponding to each quantum well. Double luminescence peaks with closely spaced within one well were observed from 90 Å and 40 Å quantum wells. Temperature and magnetic-field study revealed characteristic luminescence features associated with a bound exciton near the interface rather than with one monolayer fluctuation.

Źródło:

Acta Physica Polonica A; 1995, 88, 5; 945-948
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 69.

Tytuł:

Carrier Tunneling in High Magnetic Fields

Autorzy:

Christianen, P. C. M.
Bruggink, I. E. M.
Maan, J. C.
Van Der Vleuten, W.

Powiązania:

https://bibliotekanauki.pl/articles/1933728.pdf

Data publikacji:

1995-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.20.Dx
78.20.Ls
71.35.+z

Opis:

A magnetic field induced coupling is observed between the Landau levels with different quantum number of two GaAs quantum wells separated by a thin (Ga,Al)As tunnel barrier using magneto-photoluminescence-excitation spectroscopy. This coupling cannot be due to a resonance between single particle energy levels, and therefore an explanation is proposed in terms of the Coulomb interaction of magneto-excitons across the thin barrier.

Źródło:

Acta Physica Polonica A; 1995, 88, 4; 691-694
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 70.

Tytuł:

Weak Ferromagnetism of Fe Intercalated Fullerides

Autorzy:

Byszewski, P.
Diduszko, R.
Baran, M.

Powiązania:

https://bibliotekanauki.pl/articles/1929859.pdf

Data publikacji:

1994-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
76.70.Hb
78.55.Kz

Opis:

The magnetic properties of C$\text{}_{60}$Fe$\text{}_{x}$ resemble spin glass with the freezing onset above 200 K. The unusual magnetization behavior at intermediate temperatures is ascribed to bonds reorganization.

Źródło:

Acta Physica Polonica A; 1994, 85, 2; 297-302
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 71.

Tytuł:

Density of States for Ballistic Electrons in Electric and Magnetic Fields

Autorzy:

Zawadzki, W.
Kubisa, M.

Powiązania:

https://bibliotekanauki.pl/articles/2011136.pdf

Data publikacji:

1999-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.20.-b
73.40.Hm
78.20.Ls

Opis:

The density of states for ballistic electrons in the presence of an electric field of almost arbitrary shape is calculated for one, two, and three dimensions using the semiclassical quantization in a finite sample. The semiclassical results are compared with these of the complete quantum treatment for a constant electric field. The case of crossed electric and magnetic fields is also considered and it is demonstrated that in this configuration the density of states exhibits a transition between magnetic and electric types of motion. Implications of this transition for the quantum Hall effect are mentioned.

Źródło:

Acta Physica Polonica A; 1999, 96, 5; 603-612
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 72.

Tytuł:

Magneto-Optic Periodic Strip Structures

Autorzy:

Ciprian, D.
Pištora, J.

Powiązania:

https://bibliotekanauki.pl/articles/2014935.pdf

Data publikacji:

2001-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

42.25.Fx
78.20.Ls
75.70.-i

Opis:

The paper deals with the optical response from periodic lamellar magnetic structure consisting of permalloy strips on Si substrate covered by Cr protection layer. The ultrathin structure is magnetized in polar geometry and the spectral dependence of magneto-optic response is computed using rigorous coupled wave analysis. The results are compared with the data obtained from magneto-optical ellipsometry experiments. Further model computation helps to understand the basic features of the Kerr rotation spectra and reveal the possible reason of deviation between the experimental data and the model computation.

Źródło:

Acta Physica Polonica A; 2001, 99, 1; 33-46
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 73.

Tytuł:

Far-Infrared Narrow-Band Photodetector Based on Magnetically Tunable Cyclotron Resonance-Assisted Transitions in Pure n-Type InSb

Autorzy:

Dmowski, L. H.
Cheremisin, M.
Skierbiszewski, C.
Knap, W.

Powiązania:

https://bibliotekanauki.pl/articles/1968062.pdf

Data publikacji:

1997-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
72.40.+w
78.90.+t

Opis:

We present the possibility of using magnetic field to enhance responsivity and to tune spectral range of far-infrared InSb detector (based on photoconductivity effect) beyond its standard range limited to about 30 cm$\text{}^{-1}$. We show that due to cyclotron resonance assisted transitions we can use it as a tunable detector working up to energies about 180 cm$\text{}^{-1}$ (22 meV). We have used such a detector as a spectrometer for measurements of the Landau emission from GaAs emitter.

Źródło:

Acta Physica Polonica A; 1997, 92, 4; 733-736
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 74.

Tytuł:

Transient Photoreflectance of DMS: Thermo-Magnetic Modulations and Magnetic Relaxation

Autorzy:

Scalbert, D.

Powiązania:

https://bibliotekanauki.pl/articles/1968991.pdf

Data publikacji:

1998-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
75.50.Pp
78.47.+p

Opis:

Optical pump-and-probe experiments performed at the nanosecond timescale on Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te are reviewed. Recent studies have established that for low excitation densities thermo-magnetic modulations of the reflectivity prevail against other possible modulations. Hence the relaxation time of the signal directly reflects the spin relaxation of the Mn ions. Detailed studies of the modulation mechanisms give the opportunity to investigate some fundamental magneto-optical properties of the diluted magnetic semiconductors, otherwise beyond reach, such as the paramagnetic shift of the gap in the dilute regime.

Źródło:

Acta Physica Polonica A; 1998, 94, 2; 177-187
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 75.

Tytuł:

Large Filling-Factor-Dependent Spin Splitting in Magnetooptic Kerr Effect in GaAs/AlGaAs Multiple Quantum Wells

Autorzy:

Dudziak, E.
Bozym, J.
Pruchnik, D.
Wasilewski, Z. R.

Powiązania:

https://bibliotekanauki.pl/articles/1969050.pdf

Data publikacji:

1998-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
73.20.Dx
78.66.Fd

Opis:

Magnetooptic Kerr effect in GaAs/Al$\text{}_{0.312}$Ga$\text{}_{0.688}$As multiple quantum wells was investigated in the integer quantum Hall regime. The measurements have been performed in magnetic fields up to 14.5 T, at the temperature of 1.8 K. Experimental data indicate the discontinuous behavior of the magnetooptic Kerr effect spectrum as a function of the filling factor. For odd filling factor values ν=3 and 5 we observe the large spin splitting. The effects cannot be explained in the one-particle model.

Źródło:

Acta Physica Polonica A; 1998, 94, 2; 291-296
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 76.

Tytuł:

Experimental and numerical investigation of connector with elastomer joint

Autorzy:

Sławiński, G.
Malesa, P.
Świerczewski, M.
Bogusz, P.

Powiązania:

https://bibliotekanauki.pl/articles/243074.pdf

Data publikacji:

2017

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

elastomer
energy absorbing
LS-DYNA
experimental tests
FEM analysis

Opis:

This article presents works associated with the design, numerical analyses and experimental tests of an energyabsorbing mat designed for increasing the safety of the soldiers inside military vehicles, especially their legs. One of the most important branches of engineering interests is high technologies accompanying the safety of soldiers. Energy absorbing mats are one of an additional equipment of a military vehicle, which is directly targeted to increase leg safety during explosion of IED (Improvised Explosive Device) under vehicle. The presented invention allows protection legs of the crew’s feet resting on the floor of the vehicle during explosion of a mine or IED. In most solutions, crewmembers’ foot rests directly on the floor, causing serious injuries. The value of the load on the metatarsus and tibia is closely related to the overall vehicle structure, which generally has limitations in the use of available external and internal protection solutions. Energy absorbing mats are a universal solution because they are adaptable to any type of vehicle. Their role is particularly important in flat-bottomed armoured vehicles. The article will show the results of the analysis showing how the mat works. Experimental results will be compared with the results of numerical analysis. The analysis is conducted using the LS-DYNA explicit code.

Źródło:

Journal of KONES; 2017, 24, 3; 283-289
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 77.

Tytuł:

Numerical study of dynamic response of reinforced concrete bridge induced by selected heavy vehicle

Autorzy:

Szurgott, P.
Smolarz, M.

Powiązania:

https://bibliotekanauki.pl/articles/244088.pdf

Data publikacji:

2016

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

dynamic test
bridge
vehicle
finite element method
LS-DYNA

Opis:

The main aim of this study is to carry out dynamic simulations of structural response of reinforced concrete bridge loaded with a moving heavy vehicle. Computational dynamics analysis was conducted using LS-DYNA computer code. The selected bridge was a reinforced-concrete structure located on the U.S. 90 in Northwest Florida. The bridge has six prestressed AASHTO type III beams and concrete deck. An 8-axle vehicle including a tractor unit and a low bed trailer were selected as a representative for the study. FE model of the tractor based on previous studies; however, a FE model of the trailer was developed for the present work. Analyses included passages of a vehicle with 47 tonnes cargo. A cargo resting on a trailer was taken into account by changing the material density of selected components in the semi-trailer FE model. Time histories of the bridge deflections in the middle of the span were recorded during the simulation tests. Simulations were performed for the vehicle velocity between 20 and 50 mph, stepped by 5 mph. An influence of the velocity on the bridge deflection was determined. The main objective of the simulation tests on the selected bridge was to assess the actual dynamic load allowance (DLA), also known as impact factor, based on the maximum deflection of the bridge span as a function of the vehicle velocity.

Źródło:

Journal of KONES; 2016, 23, 4; 505-512
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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• na półce

Skocz do pozycji: 78.

Tytuł:

Magnetophotoconductivity Due to Intra-Shallow-Donor Transitions in Semi-Insulating GaAs

Autorzy:

Karpierz, K.
Sadowski, M. L.
Grynberg, M.

Powiązania:

https://bibliotekanauki.pl/articles/1890653.pdf

Data publikacji:

1991-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.40.+w
78.20.Ls
78.50.-w

Opis:

The paper concerns investigations of shallow centres in semi-insulating (SI) GaAs samples. A very sensitive measuring method - magnetophotoconductivity due to intra-shallow-donor transitions - was used. We report the behaviour of intra-impurity transitions as well as an additional structure in low magnetic fields for different far-infrared wavelengths (70.6 μm, 96.5 μm, 118.8 μm, 163 µm). The results are discussed in terms of a fluctuating potential from ionized centres in SI GaAs. The physical mechanism responsible for the low magnetic field structure is proposed.

Źródło:

Acta Physica Polonica A; 1991, 80, 2; 291-294
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 79.

Tytuł:

Magnetooptical Studies of CdTe-Rich Epitaxial Layers

Autorzy:

Dudziak, E.
Bożym, J.
Pruchnik, D.
Jędral, L. Z.

Powiązania:

https://bibliotekanauki.pl/articles/1890795.pdf

Data publikacji:

1991-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.25.Tn
72.40.+w
78.20.Ls

Opis:

The first magnetooptical studies comprising magnetoreflection, magnetoabsorption and Faraday rotation of CdTe-rich Hg$\text{}_{1-x-y}$Cd$\text{}_{x}$Mn$\text{}_{y}$Te are reported. The drastic disappearing of excitonic structure, for already very small Hg content, has been observed. The exchange parameters close to those for CdMnTe have been found.

Źródło:

Acta Physica Polonica A; 1991, 80, 3; 325-328
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 80.

Tytuł:

Magnetooptical Properties of Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se p-n Junctions

Autorzy:

Khoi, Le Van
Karczewski, G.
Dobrowolski, W.
Kossut, J.
Gałązka, R. R.

Powiązania:

https://bibliotekanauki.pl/articles/1891332.pdf

Data publikacji:

1991-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.25.Tn
78.20.Ls
72.80.Ga

Opis:

The first experimental evidence of the magnetic quantum oscillation in the photovoltaic effect of Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se p-n junctions is reported. The p-n junctions were obtained in Pb$\text{}_{1-x}$MnxSe crystals with manganese content, 0 ≤ x ≤ 0.08 by introducing Cd donors by diffusion. Measurements were per formed between 5-85 K and in the presence of the magnetic field 0-7 T in the Faraday and Voigt configurations of the incident infrared radiation of various photon energies in the vicinity of the energy gap of a Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se. Strong oscillatory behavior of the photovoltage was observed as a function of the magnetic field intensity at a constant wavelength of the incident light. Using the model of Adler of the energy band structure modified by the exchange terms, and after identification of the initial and final states of the transitions, we derive the band parameters of the Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se crystals.

Źródło:

Acta Physica Polonica A; 1991, 80, 3; 445-448
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 81.

Tytuł:

Optical Study of an Asymmetric Double Quantum Well System: CdTe/CdMnTe

Autorzy:

Lawrence, I.
Feuilet, G.
Tuffigo, H.
Bodin, C.
Cibert, J.
Rühle, W. W.

Powiązania:

https://bibliotekanauki.pl/articles/1861487.pdf

Data publikacji:

1993-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.66.Hf
78.20.Ls
78.47.+p

Opis:

Carrier tunneling through CdMnTe barriers of different thicknesses is investigated in CdTe/CdMnTe asymmetric double quantum wells. Steady-state photoluminescence at 1.8 K and time-resolved photoluminescence experiments between 10 K and 50 K were performed.

Źródło:

Acta Physica Polonica A; 1993, 84, 4; 637-640
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 82.

Tytuł:

Magnetooptical Studies of Quasi-Two-Dimensional Electron Layer on HgCdMnTe

Autorzy:

Dudziak, E.
Bożym, J.
Pruchnik, D.

Powiązania:

https://bibliotekanauki.pl/articles/1877146.pdf

Data publikacji:

1995-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.30.+y
78.20.Ls
72.40.+w

Opis:

Photovoltaic magneto-spectroscopy was used for the first time as the interband probe in the study of the 2D electron gas on narrow-gap HgCdMnTe semiconductor. The strong circular dichroism was found which agrees with the phenomenological description of the optical properties of the 2D electron systems in quantized Hall regime. The model of coupled intersubband resonances and interband transitions was proposed as a qualitative explanation.

Źródło:

Acta Physica Polonica A; 1995, 87, 2; 563-566
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 83.

Tytuł:

Photo-Induced Relaxation of Magnetization in Molecular Magnet

Autorzy:

Zieliński, P.
Tracz, P.
Podgajny, R.
Pełka, R.
Bałanda, M.
Wasiutyński, T.
Sieklucka, B.

Powiązania:

https://bibliotekanauki.pl/articles/1814014.pdf

Data publikacji:

2007-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Xx
75.60.-d
78.20.Ls

Opis:

The experimental study of photo-induced magnetization of hybrid molecular magnet containing cobalt(II) and tungsten(V) magnetic centers bridged by 4,4'-bpy and $CN^-$ is presented. The observed increase in magnetization rate is attributed to the defects due to inter-valence transfer between $Co^{II}W^V$↔ $Co^{III}W^{IV}$. The time evolution of magnetization is parameterized by the power law rather than exponential function.

Źródło:

Acta Physica Polonica A; 2007, 112, S; S-183-S-188
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 84.

Tytuł:

Environmentally Friendly Energetic Materials for Initiation Devices

Autorzy:

Ilyushin, M. A.
Tselinsky, I. V.
Shugalei, I. V.

Powiązania:

https://bibliotekanauki.pl/articles/358178.pdf

Data publikacji:

2012

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

lead azide
LA
lead styphnate
LS
low toxicity primary explosives

Opis:

The problems of synthesis, properties and applications of environmentally-friendly, primary explosives are discussed. Several prospective, lead-free primary explosives have been prepared and thoroughly studied during recent decades. However, the manufacture of modern, 'green' energetic materials on an industrial scale for practical applications in civil and military primers, is a task for the near future.

Źródło:

Central European Journal of Energetic Materials; 2012, 9, 4; 293-327
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 85.

Tytuł:

A finite element model development as a part of process of energy absorption material selection

Autorzy:

Jakubowski, R.
Skorupka, Z.

Powiązania:

https://bibliotekanauki.pl/articles/244612.pdf

Data publikacji:

2016

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

RASTAS Spear
material
energy absorption
finite element model
LS-DYNA

Opis:

The Warsaw Institute of Aviation major role in the RASTAS Spear project was to design an energy absorption system for the space probe lander. As the system was meant to be unmanned, the main requirement was to use no active solutions like parachute or rocket propulsion (less complexity in application and thus more reliability). A group of various materials was chosen to be tested. Tests campaign was divided into three stages: static compression tests, low speed dynamic tests and high speed dynamic tests. The high-speed dynamic tests were divided into two substages. In the first one simple cube specimens were tested to obtain data necessary for second substage in which full-scale object was tested. Having valuable data from experiments, numerical simulations in LS-DYNA software were carried out and then the results were compared. Based on experimental data several iterations during finite element model developing process were made. That process allowed setting up properly simulation by changing and adjusting properties such: material models, contact types, element formulation and other important constants. The finite element simulation results showed a good correlation with experimental data. The knowledge gained from numerical model optimization in connection with experimental data allowed for creating faster and more accurate energy absorbing material selection methodology. This methodology was successfully used in subsequent projects in which Institute of Aviation took part and also can be used in other future applications.

Źródło:

Journal of KONES; 2016, 23, 3; 217-223
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 86.

Tytuł:

Studies on the effectiveness of the innovative road safety system

Autorzy:

Borkowski, W.
Hryciów, Z.
Rybak, P.
Wysocki, J.
Wiśniewski, A.

Powiązania:

https://bibliotekanauki.pl/articles/242956.pdf

Data publikacji:

2014

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

road safety barrier
crash tests
computer simulation
LS-DYNA
FEM

Opis:

The paper evaluates the effectiveness of the innovative road safety system equipped with prototype component segments composed of a body made of a plastic filled with reinforced concrete. Main advantages of the new safety barrier include increased resistance to corrosion as well as easy transport and assembly directly on a road section being secured. Model tests were performed on a car of 900 kg weight allowing for carrying out the TB11 tests according to the EN 1317-2 standard. LS-DYNA software was applied for modelling, using the finite element method. The work presents the numerical test results, trajectory of vehicle movement after collision as well as the concrete barrier displacement. It also includes examples of stress in steel bars and joint coupling. Detailed assessing of simulation test results were made on the basis of ASI, THIV and PHD index. They were calculated on the basis of velocity and acceleration courses of selected car bodywork points. Numerical test results confirm the fact that this system meets the normative requirements. They allow for qualifying that system for B impact severity level and W4 working width. The results presented in the paper make the initial stage of the study and further calculations will be oriented towards a possibility of meeting the requirements for higher restraint levels.

Źródło:

Journal of KONES; 2014, 21, 2; 27-32
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 87.

Tytuł:

Estimation of copper concentrate grade based on color features and least-squares support vector regression

Autorzy:

Ren, C.
Yang, J.
Liang, C.

Powiązania:

https://bibliotekanauki.pl/articles/110309.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

concentrate grade
copper concentrate
LS-SVR
color features
microscopic image

Opis:

In this paper, a new method based on color features of microscopic image and least-squares support vector regression model (LS-SVR) is proposed for indirect measurement of copper concentrate grade. Red, green and blue (RGB), hue and color vector angle were extracted from color microscopic images of a copper concentrate sample and selected for the comparison. Three different estimation models based on LS-SVR were developed using RGB, hue, and color vector angle, respectively. A comparison of three models was carried out through a validation test. The best model was obtained for the hue giving a running time of 30.243 ms, root mean square error of 0.8644 and correlation coefficient value of 0.9997. The results indicated that the copper concentrate grade could be estimated by the LS-SVR model using the hue as input parameter with a satisfactory accuracy.

Źródło:

Physicochemical Problems of Mineral Processing; 2015, 51, 1; 163-172
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 88.

Tytuł:

Prediction of critical flashover voltage of polluted insulators under sec and rain conditions using least squares support vector machines (LS-SVM)

Autorzy:

Mahdjoubi, Abdelhalim
Zegnini, Boubakeur
Belkheiri, Mohammed

Powiązania:

https://bibliotekanauki.pl/articles/328898.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN

Tematy:

LS-SVM
flashover
modelling
polluted insulator
GMDL
przeskok
modelowanie
izolator

Opis:

This paper describes a methodology that was developed for the prediction of the critical flashover voltage of polluted insulators under sec and rain conditions least squares support vector machines (LS-SVM) optimization. The methodology uses as input variable characteristics of the insulator such as diameter, height, creepage distance, and the number of elements on a chain of insulators. The estimation of the flashover performance of polluted insulators is based on field experience and laboratory tests are invaluable as they significantly reduce the time and labour involved in insulator design and selection. The majority of the variables to be predicted are dependent upon several independent variables. The results from this work are useful to predict the contamination severity, critical flashover voltage as a function of contamination severity, arc length, and especially to predict the flashover voltage. The validity of the approach was examined by testing several insulators with different geometries. A comparison with the Grouping Multi-Duolateration Localization (GMDL) method proves the accuracy and goodness of LS-SVM. Moreover LS-SVMs give a good estimation of results which are validated by experimental tests.

Źródło:

Diagnostyka; 2019, 20, 1; 49-54
1641-6414
2449-5220

Pojawia się w:

Diagnostyka

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 89.

Tytuł:

Numerical analysis of impact between shunting locomotive and selected road vehicle

Autorzy:

Dziewulski, P.
Stankiewicz, M.
Szurgott, P.

Powiązania:

https://bibliotekanauki.pl/articles/245955.pdf

Data publikacji:

2014

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

finite element method
dynamic analysis
crash test
railway vehicle
LS-DYNA

Opis:

The main aim of this study is to carry out dynamic finite element analysis of a crash between shunting locomotive and selected road vehicle. Numerical simulations include side impact of the running locomotive in the vehicle situated across the track. A considered locomotive based on a popular Polish shunting locomotive – SM42. However, the tested locomotive was slightly modernized in comparison with the original one. Finite element model of the locomotive was developed by the authors whereas the vehicle FE model was download from the free database of such models. FE analysis was carried out according to the PN-EN 15227 standard which provides crashworthiness requirements for railway vehicle bodies. 15 tons large truck was selected as a representative for the study. One of the design collision scenario includes such deformable obstacle for railway vehicles operated on national and regional networks. LS-DYNA computer code was used for the simulations. The paper presents selected results of analysis generally focused on the locomotive frame behaviour. Contours of stress for selected moments of time are presented. Moreover, time histories of selected parameters are depicted. The energy balance was also checked in order to confirm the accuracy of analysis. The current study is a part of the project focused on modernization of the SM42 locomotive. Therefore, it is required to evaluate the locomotive behaviour during the impact test. Dynamic numerical simulation are acceptable since the experimental tests on the complete objects under consideration are impractical and impossible at the moment.

Źródło:

Journal of KONES; 2014, 21, 4; 87-94
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 90.

Tytuł:

Structural response of a blast loaded fuselage

Autorzy:

Dacko, A.
Toczyski, J.

Powiązania:

https://bibliotekanauki.pl/articles/246151.pdf

Data publikacji:

2010

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

thin-walled structures
blast wave load
fluid-structure interaction
LS-DYNA

Opis:

The most important task in tests of resistance of aircraft structures to the terrorist threats is to determine the sensitivity of thin-walled structures to the blast wave load. For obvious reasons, full-scale experimental investigations are carried out exceptionally. In such cases numerical analyses are very important. They allow tuning modelparameters for proper correlation with experimental data. With this preliminary analysis experiment can be planned properly. The paper presents a summary of the results of numerical analysis of model of medium sizefuselage. Various manufacturing techniques are considered - the skin made of aluminum alloy (2024-T3) and the skins made of modern layered materials (GLARE) were compared. Characteristics of the materials used in FE simulations were obtained experimentally. Modelling of C4 detonation was also discussed. Studies have shown very strong sensitivity of the results to chosen numerical models of materials, formulations of elements, assumed parameters etc. Studies confirm also very strong necessity of the correlation of analysis results with experimental data. Without such a correlation it is difficult to talk about the validation of the results obtained from the "explicit" codes.

Źródło:

Journal of KONES; 2010, 17, 1; 101-109
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 91.

Tytuł:

Simulations of front impact between two shunting locomotives at different velocities

Autorzy:

Szurgott, P.
Kozioł, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/244509.pdf

Data publikacji:

2016

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

finite element method
dynamic analysis
crash test
railway vehicle
LS-DYNA

Opis:

The main aim of this study is to carry out dynamic simulations of a crash between two identical shunting locomotives running at different velocities. Numerical analyses using a Finite Element Method (FEM) include front-end impact of the running locomotive with a stationary one situated on the track. Such collision scenario is required for railway vehicles operated on national and regional networks. A considered locomotive based on a Polish shunting locomotive – SM42, however the tested locomotive was slightly modernized. Finite element model of the locomotive was developed by the authors. FE analyses were conducted according to the PN-EN 15227 standard, which provides crashworthiness requirements for railway vehicle bodies. LS-DYNA computer code was used for the simulations. The paper presents selected results of analyses focused on the locomotive frame behaviour. Simulations were performed for the vehicle between 20 and 90 km/h. An influence of the impact velocity on some output quantities was determined. Contours of effective stress for selected moments of time as well as time histories of selected values are depicted. For modernized locomotives, it is required to evaluate their behaviour during the impact test. Dynamic numerical simulation is acceptable since the experimental tests on the complete objects under consideration are impractical and impossible sometimes.

Źródło:

Journal of KONES; 2016, 23, 2; 381-388
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 92.

Tytuł:

Determination Of Gas Mixture Components Using Fluctuation Enhanced Sensing And The LS-SVM Regression Algorithm

Autorzy:

Lentka, Ł.
Smulko, J. M.
Ionescu, R.
Granqvist, C. G.
Kish, L. B.

Powiązania:

https://bibliotekanauki.pl/articles/221708.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

LS-SVM algorithm
resistance gas sensor
fluctuation enhanced sensing
gas detection

Opis:

This paper analyses the effectiveness of determining gas concentrations by using a prototype WO₃ resistive gas sensor together with fluctuation enhanced sensing. We have earlier demonstrated that this method can determine the composition of a gas mixture by using only a single sensor. In the present study, we apply Least-Squares Support-Vector-Machine-based (LS-SVM-based) nonlinear regression to determine the gas concentration of each constituent in a mixture. We confirmed that the accuracy of the estimated gas concentration could be significantly improved by applying temperature change and ultraviolet irradiation of the WO₃ layer. Fluctuation-enhanced sensing allowed us to predict the concentration of both component gases.

Źródło:

Metrology and Measurement Systems; 2015, 22, 3; 341-350
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 93.

Tytuł:

Numerical analysis of the front impact between two shunting locomotives

Autorzy:

Dziewulski, P.
Konarzewski, M.
Szurgott, P.

Powiązania:

https://bibliotekanauki.pl/articles/245458.pdf

Data publikacji:

2014

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

finite element method
dynamic analysis
crash test
railway vehicle
LS-DYNA

Opis:

The main aim of this study is to carry out dynamic finite element analysis of a crash between two identical shunting locomotives. Numerical simulations include front-end impact of the running locomotive with a stationary one situated on the track. The first design collision scenario includes such obstacle for railway vehicles operated on national and regional networks. A considered locomotive based on a popular Polish shunting locomotive – SM42. However, the tested locomotive was slightly modernized in comparison with the original one. Finite element model of the locomotive was developed by the authors. FE analyses were carried out according to the PN-EN 15227 standard, which provides crashworthiness requirements for railway vehicle bodies. LESS-DYNA computer code was used for the simulations. The energy balance was initially checked in order to confirm the accuracy of analysis. The paper presents selected results of analyses focused on the locomotive frame behaviour. Contours of effective stress for selected moments of time are presented. Time histories of selected parameters are also depicted. The current study is a part of the project focused on modernization of the SM42 locomotive. Therefore, it is required to evaluate the locomotive behaviour during the impact test. Dynamic numerical simulation is acceptable since the experimental tests on the complete objects under consideration are impractical and impossible at the moment.

Źródło:

Journal of KONES; 2014, 21, 3; 81-88
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 94.

Tytuł:

Influence of the shape of the explosive charge on blast profile

Autorzy:

Hryciów, Z.
Borkowski, W.
Rybak, P.
Wysocki, Z.

Powiązania:

https://bibliotekanauki.pl/articles/247727.pdf

Data publikacji:

2014

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

cylindrical and rectangular charge
blast overpressure
blast impulse
LS-DYNA
ALE

Opis:

When an explosive charge is fired, the nature and mass of the explosive are the only parameters of importance usually considered. The shape however, also plays a major role in the effect of an explosive charge. Knowledge of shape effect can be important before the use of the explosive (in order to create a maximum effect with a given mass of explosive), or in post-explosion damage assessment. The shape effect however is only significant within a certain range from the charge. At longer distance, the produced blast wave tends to be spherical. The shock wave parameters studied in this work are the peak overpressure and the first positive impulse. A series of numerical test has been performed in order to determine the range of influence of the charge shape. Different locations of initiation were compared. A hemispherical charge was point detonated at its centre whereas a cylindrical shape was detonated at the centre of an upper or lower plane. Numerical simulations of near field burst were conducted using LS-DYNA software. During numerical tests a pressure fields were determined for different shapes of explosive charges as well as the pressure waveforms at points located 1000 mm from a centre. Additionally, reference pressure history curves from LOAD_BLAST_ENHANCED procedure were calculated.

Źródło:

Journal of KONES; 2014, 21, 4; 169-176
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 95.

Tytuł:

Determination of the JWL Constants for ANFO and Emulsion Explosives from Cylinder Test Data

Autorzy:

Sanchidrián, J. A.
Castedo, R.
López, L. M.
Segarra, P.
Santos, A. P.

Powiązania:

https://bibliotekanauki.pl/articles/358385.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

cylinder test
JWL equation of state
LS-DYNA
ANFO
emulsion explosives

Opis:

The Jones-Wilkins-Lee (JWL) equation of state parameters for ANFO and emulsion-type explosives have been obtained from cylinder test expansion measurements. The calculation method comprises a new radial expansion function, with a non-zero initial velocity at the onset of the expansion in order to comply with a positive Gurney energy at unit relative volume, as the isentropic expansion from the CJ state predicts. The equations reflecting the CJ state conditions and the measured expansion energy were solved for the JWL parameters by a non-linear least squares scheme. The JWL parameters of thirteen ANFO and emulsion type explosives have been determined in this way from their cylinder test expansion data. The results were evaluated through numerical modelling of the tests with the LS-DYNA hydrocode; the expansion histories from the modelling were compared with the measured ones, and excellent agreement was found.

Źródło:

Central European Journal of Energetic Materials; 2015, 12, 2; 177-194
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 96.

Tytuł:

Integrated estimation model of clean coal ash content for froth flotation based on model updating and multiple LS-SVMs

Autorzy:

Dong, Zhiyong
Wang, Ranfeng
Fan, Minqiang
Fu, Xiang
Geng, Shaowei

Powiązania:

https://bibliotekanauki.pl/articles/110152.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

flotation
clean coal ash content
integrated estimation model
multiple LS-SVMs

Opis:

Clean coal ash content, a prominent product index describing coal froth flotation, is difficult to be measured online. This constraint leads to a lack of timely guidance during operation and impedes the optimal operation of the coal flotation process. To solve this problem, considering the fluctuation of working conditions, the heterogeneity of raw coal and the variation of feed coal classes, an integrated estimation model of clean coal ash content for coal flotation based on model updating and multiple least squares support vector machines (LS-SVMs) is proposed. First, a single estimation model for a single class of coal based on LS-SVM is built, and the internal parameters are optimized by gravitational search algorithm (GSA). Second, the model updating strategy is designed to solve the problem of the decline in single model accuracy. Furthermore, a multiple LS-SVMs model formed by several single models for different classes of coal is studied along with the model switching mechanism to address the problem of model mismatch. Finally, an industrial experiment and evaluation are conducted. The mean relative error between the estimated and actual values is 3.32%, and the correlation coefficient is 0.9331. The estimation accuracy and adaptability of the integrated model can meet the industrial requirements.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 1; 21-37
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 97.

Tytuł:

Comparison of the Methods for LS Factor Calculation when Evaluating the Erosion Risk in a Small Agricultural Area Using the USLE Tool

Autorzy:

Karásek, Petr
Pochop, Michal
Konečná, Jana
Podhrázská, Jana

Powiązania:

https://bibliotekanauki.pl/articles/2025427.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

water erosion
land use
GIS
LS factor
USLE
anti-erosion measure

Opis:

In the projects of anti-erosion protection in the Czech Republic, USLE was used as a standard tool for evaluating the risk of water erosion. The precision of the resulting USLE values is defined by the quality of input data and algorithms used. Two methods for LS factor calculation are recommended for use in the planning practice in the Czech Republic: the computing method based on the USLE 2D software and the other computing methods. Various methods can assess the LS factor; however, their results differ. On the example of the Starovice – Hustopeče study area (Czech Republic), strongly threatened by erosion, this report aimed to show the differences brought using these differing methods of LS factor assessment, all in two variants before and after application of antierosion measures (retention grass belts, grassed thalweg). Changes in the calculation of the LS factor were directly reflected in the calculation of the long-term average soil loss by water erosion.

Źródło:

Journal of Ecological Engineering; 2022, 23, 1; 100-109
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 98.

Tytuł:

The Evaluation of Solid Particle Erosion in Polymethyl Methacrylate by Surface Topography Mapping

Autorzy:

Fidan, S.

Powiązania:

https://bibliotekanauki.pl/articles/1194942.pdf

Data publikacji:

2014-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.68.+m
42.79.Ls
42.87.-d
81.05.Qk

Opis:

The present work introduces and demonstrates a novel high resolution surface topography method for mapping the distribution of erosive wear in polymethyl methacrylate. The technique is based on grayvalues obtained from eroded sample surfaces and three-dimensional surface topography mapping from these grayvalues. Surface topography maps make it a valuable method for fundamental studies on erosive wear. In the present investigation, a flatbed scanner system has been used for obtaining the surface images of eroded test samples. Polymethyl methacrylate test samples eroded with 80 and 120 mesh alumina particles at 1.5 and 3 bar blast pressures and their surface topography maps compared. Erosive wear is difficult to visualize for its dynamic and complex nature, hence monitoring of erosive wear in industrial applications is rather important. High resolution surface topography method detail capturing capability may improve tribological surface damage characterization of real machine elements. Reduced costs and simplicity two primary outcomes of using a simple flatbed scanner system in non destructive testing of erosive wear.

Źródło:

Acta Physica Polonica A; 2014, 125, 2; 494-496
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

MBE Growth and Magnetooptical Properties of (Zn,Co)Te Layers

Autorzy:

Papaj, M.
Kobak, J.
Rousset, J.
Janik, E.
Golnik, A.
Kossacki, P.
Pacuski, W.

Powiązania:

https://bibliotekanauki.pl/articles/1403629.pdf

Data publikacji:

2012-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Pp
75.30.Hx
78.20.Ls
71.35.Ji

Opis:

We report on epitaxial growth of diluted magnetic semiconductor (Zn,Co)Te. Reflectivity spectra reveal excitonic transition which split under magnetic field due to giant Zeeman effect. Magnetooptical effects can be described using literature data.

Źródło:

Acta Physica Polonica A; 2012, 122, 6; 1010-1011
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 100.

Tytuł:

Phase Composition and Magnetic Properties of Nanoperm Thin Films Doped with Yttrium

Autorzy:

Brzózka, K.
Sovák, P.
Szumiata, T.
Górka, B.
Gawroński, M.

Powiązania:

https://bibliotekanauki.pl/articles/1428972.pdf

Data publikacji:

2012-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Bb
75.70.-i
76.80.+y
78.20.Ls

Opis:

Thin films of Nanoperm alloys with partial substitution of iron by yttrium are the subject of investigations. The attention is fixed on the influence of yttrium substitution on structure and magnetic characteristics of the samples. The effect of film thickness is also considered. Conversion electron Mössbauer spectroscopy and magneto-optic Kerr effect were used to derive hyperfine parameters and coercive field, respectively. Coexistence of crystalline bcc-Fe phase and an amorphous one with diverse proportion was stated in most of the samples. It was found that surface and interface regions contribute to the magnetic properties of films.

Źródło:

Acta Physica Polonica A; 2012, 121, 5-6; 1270-1272
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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