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Wyświetlanie 1-15 z 157
Tytuł:
On education in the perspective of tragedy
Autorzy:
Futyma, Sławomir
Rudnicki, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/644948.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
en
Opis:
Man experiences their existence constantly experiencing tension that emerges between that which is and that which could be, between the actual, known, and the unknown that barely shines in the horizon. In this uncomfortable experience, one can find potential for development, hidden behind a facade of pretence and camouflage, which, when disclosed and uncovered can be the “fuel” of satisfactory change. As a result, education can be in service of man once again. This process, as a fundamental experience, will assume the acceptance of truth about the human condition and the circumstances of its emergence in the course of life. Education not abandoning man must rediscover and re-evaluate such categories as fate, uncertainty, fragility, unforeseeability.
Źródło:
Kultura-Społeczeństwo-Edukacja; 2019, 15, 1; 17-32
2300-0422
Pojawia się w:
Kultura-Społeczeństwo-Edukacja
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of GdMn$\text{}_{x}$Fe$\text{}_{1-x}$Si intermetallic Compounds
Autorzy:
Nikitin, S. A.
Ivanova, T. I.
Tskhadadze, I. A.
Powiązania:
https://bibliotekanauki.pl/articles/1956493.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.En
Opis:
Magnetic properties of GdMn$\text{}_{x}$Fe$\text{}_{1-x}$Si (x = 1, 0.9, 0.8, 0.7, 0.6, 0) compounds were investigated. Both GdMnSi and GdFeSi crystallize in the CeFeSi-type tetragonal structure and form a complete solid solution without any change in the crystal structure. Magnetic measurements were made in static magnetic fields up to 1 MA/m in the temperature range from 77 K to 420 K. For GdFeSi these measurements were carried out on single crystal sample. It was found that the increase in Fe content leads to a sharp decrease in saturation magnetic moment. The Curie temperature increases in the concentration range 0.7 ≤ x ≤ 1 and monotonously decreases for x ≤ 0.6. These effects could be explained by strong dependence of the exchange integrals on the interatomic distances.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 463-466
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of Solids and Adsorbates in Synchrotron Radiation Excited Soft X-Ray Fluorescence
Autorzy:
Nordgren, J.
Wassdahl, N.
Powiązania:
https://bibliotekanauki.pl/articles/1920879.pdf
Data publikacji:
1992-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.En
Opis:
A progress report is presented on recent developments in soft X-ray emission spectroscopy using synchrotron radiation. Some key experiments are discussed demonstrating that new information can be gained by using synchrotron radiation for this purpose. Recent work on highly resolved soft X-ray emission from monolayers of adsorbed species is commented on and some perspectives are given regarding further developments expected from the third generation sources that are underway.
Źródło:
Acta Physica Polonica A; 1992, 82, 2; 251-262
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulations of Alfv´en waves in the solar atmosphere with the PLUTO code
Autorzy:
Wołoszkiewicz, P.
Murawski, K.
Musielak, Z. E.
Mignone, A.
Powiązania:
https://bibliotekanauki.pl/articles/205850.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
MHD
Alfv´en waves
Opis:
With an adaptation of the PLUTO code, we present a 2.5-dimensional Cartesian magnetohydrodynamic model with the invariant (∂/∂z = 0) coordinate z of propagating magnetohydrodynamic- gravity waves in the solar atmosphere, permeated by curved magnetic field and constant gravity field g = −gˆy. This code implements second-order accurate Godunov-type numerical scheme and MPI for high level of parallelization. We show that the inhomogeneous grid, originally built in the code, resolves well the system dynamics, resulting from the localized pulse initially launched in the transverse component of velocity Vz. We consider two cases for background magnetic field Be = [Bex,Bey,Bez] with its transverse component: (a) Bez = 0 and (b) Bez 6= 0. In case (a), the initial pulse triggers only Alfv´en waves, described solely by Vz. These waves drive by ponderomotive forces the magnetoacoustic waves, associated with perturbations in Vx and Vy. As a result of Bez 6= 0, in the (b) case, Alfv´en waves are coupled to their magnetoacoustic counterparts and all three velocity components are perturbed. We show that in this case the PLUTO code is accurate, its order being 1.97 and the numerically induced flow is of magnitude ≈ 0.1 km s−1, i.e. by a factor of at least ≈ 103 lower than the characteristic (Alfv´en) speed of the system. The errors, associated with the selenoidal condition, are low with the max |∇ ・ B| ≈ 1.3 ・ 10−10 Tesla km−1. We conclude that the PLUTO code copes well with resolving all spatial and temporal scales that appear in this numerically challenging system.
Źródło:
Control and Cybernetics; 2014, 43, 2; 321-335
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advances in risk analysis in railway signalling
Autorzy:
Jensen, B.
Griebel, S.,
Powiązania:
https://bibliotekanauki.pl/articles/2069433.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
risk analysis
level crossing
semi-quantitative method
safety
EN50126
EN50129
Opis:
The paper is concerned with the developments of risk analysis during the last decade, starting from full range quantitative risk analysis of e.g. a level crossing based on the CENELEC standards EN50126 and EN50129 up to semi-quantitative methods for risk analysis. To expedite this shift from pure quantitative approaches to a more categorized approach were the perennial challenges of insufficient availability of accurate data and the sheer complexity of the reality to be model quantitatively. The article contains both a presentation of a complete quantitative risk analysis for a level crossing as well as a discussion of the crucial points that will need improvement on the basis of a new semi-quantitative standard for risk analysis that has been issued as a national pre-standard in Germany. The relation to the current regulations stipulated by the European Railway Agency and recent publications on this issue are presented as well.
Źródło:
Journal of Polish Safety and Reliability Association; 2012, 3, 1; 101--108
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
European Standardisation in Fire Safety of Rolling Stock
Normalizacja europejska w ochronie przeciwpożarowej taboru szynowego
Autorzy:
Bencze, Z.
Powiązania:
https://bibliotekanauki.pl/articles/215605.pdf
Data publikacji:
2013
Wydawca:
Instytut Kolejnictwa
Tematy:
EN 45545
CEN / CENELEC
TRANSFEU project
EN-45545
CEN/CENELEC
projekt TRANSFEU
Opis:
The article discusses the principles of European standarization and the history and future prospects of the package of EN 45545. This standard is being developed since 1991 to spring 2013, will be in the autumn of 2013 subject to verification.
W artykule omówiono zasady normalizacji europejskiego oraz historię i dalsze perspektywy dotyczące pakietu norm EN 45545. Norma, opracowywana od 1991 r. do wiosny 2013 r., jesienią 2013 r. będzie poddana procesowi weryfikacji.
Źródło:
Problemy Kolejnictwa; 2013, 160; 29-34
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time, Self and Style in Virginia Woolfs “Orlando. A Biography”
Autorzy:
CMECIU, DOINA
Powiązania:
https://bibliotekanauki.pl/articles/957649.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Opolski
Tematy:
(discourse oj) change
transaction
time
temporality
self
style
autobiography
process of metaphorization
metonymy
misę en abyme/en hauteur/en surface
text as self
“Orlando”
Opis:
The paper is an attempt to show Virginia Woolfs ‘struggle’ to make ordinary (life, be- ing and language) become extraordinary. Orlando. A Biography, a text begun sometime in early October (8th) 1927 “as a joke” and finished on the 17th of March, “as the clock struck one” (A WD: 160-161), 1928, may be considered as the prematurely bom child of a mmt/endowed with ‘one rare gift’: that of seeking. It is the seeking of the Word which constitutes the backbone of this ‘joke’. And yet, behind laughter and light-heartedness, there is a serious desire to discover “the most necessary thing to me [Woolf]” (A WD: 169): the ‘reality’ of the creative self through time.Thus, the Orlando-biography invites the reader to decode it as an autobiography, which, finally, proves to be a recording of a spiritua! joumey to attain freedom, stylistical- ly achieved through a gamę of positings and modes of reading and writing. In order to show the process of shaping the creative self in Orlando, we have used some strategies offered by approaches such as:a. phenomenological (offering insights into moods, States of consciousness and the methods used “to investigate” “second selves” (AWD, 1925)- “... opened and intensified as it (the mind) is by the heat of creation” and “to expose” one’s mind, body and self “to the blasts of the outer world” (pp.cit., 1935);b. pragmatic (helping the reader to see how “... the words” can be madę “to glue toget- her, fuse and glow” (AWD, 1924) and how “sentences form and curve under my fingers” (pp.cit., 1935) in order to “convey the true reality” (pp.cit., 1923) to somebody;c. and semiotic (unfolding Woolfs gamę of minimalising or expanding some me- anings, in and through time, which makes out of the word in Woolfs text a dynamie sign).The three approaches will help the reader to see the Woolfian text as a sign-wi- thin-a-sign-within-a-sign. The ‘Orlando-joke’ finally proves to be a complex gamę of po- siting the (creative) self in a temporal abyme, hauteur and surface (Cmeciu 1999), which is unfolded through a metaphoric and metonymic modę (Lodge 1989).  
Źródło:
Stylistyka; 2007, 16; 273-291
1230-2287
2545-1669
Pojawia się w:
Stylistyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Structural Characterization of Nickel and Iron Based Heusler Ribbons Ni₂FeZ (Z = In, Sn, Sb)
Autorzy:
Frol'ová, L.
Ryba, T.
Vargová, Z.
Komanický, V.
Kováč, J.
Gyepes, R.
Varga, R.
Powiązania:
https://bibliotekanauki.pl/articles/1032228.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.En
75.30.Gw
Opis:
Comparison of structural, chemical, and magnetic properties of Ni₂FeZ (Z = In, Sn, Sb) Heusler ribbons produced by melt-spinning method is presented. The aim of work was to prepare the Heusler alloys with the appropriate chemical composition in a single step without additional thermal treatment. Scanning electron microscopy analysis revealed polycrystalline structure of all samples. It is shown that correct L2₁ structure of Ni₂FeSb can be obtained in a single production step. On the other hand, no Heusler L2₁ phase (nor its variants) occur in Ni₂FeSn alloy. Additionally, magnetic characterization revealed high Curie temperatures of the Heusler phases (above 600 K for Ni₂FeSb and 800 K for Ni₂FeIn).
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 735-737
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neutron diffraction studies of PrNi₅Sn
Autorzy:
Penc, B.
Hoser, A.
Szytuła, A.
Powiązania:
https://bibliotekanauki.pl/articles/1075355.pdf
Data publikacji:
2016-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.F-
75.20.En
Opis:
Powder neutron diffraction measurements of PrNi₅Sn performed in the temperature range 1.5-76 K indicate that the compound crystallizes in a hexagonal CeNi₅Sn-type crystal structure (space group P6₃/mmc). The a lattice parameter and the unit cell volume V increase while the c lattice parameter does not change with increasing temperature. No long range magnetic ordering was detected down to 1.5 K, in contradiction to bulk magnetometric results.
Źródło:
Acta Physica Polonica A; 2016, 129, 3; 313-314
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-glass behavior in LaCu₄Mn compound
Autorzy:
Synoradzki, K.
Powiązania:
https://bibliotekanauki.pl/articles/1053142.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Lk
75.20.En
Opis:
The experimental results of the X-ray powder diffraction, magnetic susceptibility, electrical resistivity, and specific heat measurements of the LaCu₄Mn compound are presented. LaCu₄Mn is an intermetallic compound that crystallizes in the hexagonal CaCu₅-type structure (space group P6/mmm, No. 191), where the atoms on the 3g (1/2, 0, 1/2) site create a kagome lattice, which can cause the spin frustration and leads to a variety of interesting states of matter, such as spin-ice, spin-liquid, and spin-glass states. The Rietveld refinement reveals a random distribution of Mn and Cu atoms on the 3g and 2c site, where about 80% of Mn atoms occupy the 3g site. The lattice parameters are a=5.252(1) Å and c=4.176(1) Å. The low-field zero-field-cooled and field-cooled DC magnetic susceptibilities show splitting below the spin freezing temperature T_f ≈33 K. At 2 K the magnetization M(H) exhibits hysteresis with coercivity field of ≈5 kOe. The AC susceptibility measurements exhibit a frequency-dependent cusp, associated with a frequency-dependent freezing temperature. Moreover, there is no clear sign of long range magnetic order in specific heat and resistivity measurements.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1024-1026
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Presence of Parimagnetism in $Ho(Co_{1-x}Si_{x})_{2}$ Under Hydrostatic Pressure
Autorzy:
Valenta, J.
Prchal, J.
Kratochvílová, M.
Míšek, M.
Sechovský, V.
Powiązania:
https://bibliotekanauki.pl/articles/1372511.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.En
75.50.Gg
Opis:
A new configuration of cobalt magnetic moments with respect to rare-earth ones on local level, named as parimagnetism, surviving above the Curie temperature was determined few years ago for $ErCo_{2}$. Occurrence of parimagnetism has recently been confirmed also for $HoCo_{2}$. In this paper we present results manifesting considerable composition and hydrostatic-pressure influence on characteristic temperatures of magnetism in $Ho(Co_{1-x}Si_{x})_{2}$ compounds and draw a preliminary scenario analyzing the exchange interactions involved.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 406-408
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Annealing Temperature on the Phase Constitution and Magnetic Properties of the Pr₈Dy₁Fe₆₀Co₇Mn₆B₁₄Zr₁Ti₃ Alloy Ribbons
Autorzy:
Przybył, A.
Pawlik, K.
Pawlik, P.
Gębara, P.
Kaszuwara, W.
Wysłocki, J.
Filipecka, K.
Powiązania:
https://bibliotekanauki.pl/articles/1402331.pdf
Data publikacji:
2015-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.En
91.60.Pn
Opis:
Melt-spun ribbons were produced from the Pr₈Dy₁Fe₆₀Co₇Mn₆B₁₄Zr₁Ti₃ base alloy at the surface velocity of the cooper wheel of 30 m/s. The studies showed amorphous structure of ribbons and their soft magnetic properties. X-ray diffraction was used to determine phase constitution of all obtained samples. Annealing of ribbons caused formation of nanocomposite structure, which was a result of coexistence of hard magnetic RE₂(Fe,Co)₁₄B and soft magnetic α-Fe phases. Basic magnetic properties such as: coercivity $\text{}_{J}H_{c}$, remanence $J_{r}$ and maximum energy product $(BH)_\text{max}$ were determined from the measured hysteresis loops. The microstructure of selected specimens was observed by transmission electron microscopy technique.
Źródło:
Acta Physica Polonica A; 2015, 128, 1; 94-97
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Angular Distribution of Bremsstrahlung Photons in Ta Target for 40 MeV Electron Beam
Autorzy:
Demir, N.
Kuluöztürk, Z.
Akkurt, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1402503.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Jj
23.20.En
Opis:
Bremsstrahlung photons are created by electron beams de-accelerating in electric field (coupling with a thin radiator) and are used in a variety of different fields. In nuclear physics experiments it is important to transport and focus the created photon beam into the experimental cavity. Here angular distribution of the photon beam is one of the important parameters, which should be known. In this study a FLUKA simulation has been done to obtain angular distribution of photon beam created by interaction of 40 MeV electron beam with the tantalum (Ta) radiator of varied thickness, which is planned to be used in bremsstrahlung photon facility at TARLA (Turkish Accelerator and Radiation Laboratory in Ankara). TARLA will be the first facility of Turkish Accelerator Center project.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-443-B-444
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Interactions between Nanoparticles Formed during Calcination of Ferrihydrite
Autorzy:
Schneeweiss, O.
David, B.
Žák, T.
Filip, J.
Tuček, J.
Zbořil, R.
Mašláň, M.
Powiązania:
https://bibliotekanauki.pl/articles/1506995.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Ck
75.20.En
Opis:
Magnetic interactions between nanoparticles of magnetite $Fe_3O_4$ and α-Fe formed during calcination of ferrihydrite in $H_2$ at temperatures 533 ÷ 713 K were studied. The detailed phase analysis describes evolution of contents of magnetite and α-Fe. Explanation of an anomalous course of magnetic moment characterized by a local maximum at an early stage of formation of nanoparticles is discussed.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 749-750
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic, Magnetic and Transport Properties of YCo$\text{}_{3}$B$\text{}_{2}$ Compound
Autorzy:
Kowalczyk, A.
Jezierski, A.
Smardz, L.
Baszyński, J.
Powiązania:
https://bibliotekanauki.pl/articles/2013655.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Eb
75.20.En
Opis:
We studied the electronic, magnetic and transport properties of the hexagonal YCo$\text{}_{3}$B$\text{}_{2}$ compound. The electronic structure was studied by X-ray photoemission spectroscopy and ab initio self-consistent tight binding linear muffin tin orbital method. We found a good agreement between the experimental X-ray photoemission spectroscopy valence band spectra and theoretical calculations. Theoretical calculations showed that the YCo$\text{}_{3}$B$\text{}_{2}$ is a paramagnet in agreement with experimental results. Electrical resistivity at low temperatures shows a T$\text{}^{2}$ dependence, implying that the scattering by the spin fluctuactions is dominant in this temperature range.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 803-806
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 157

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