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Wyszukujesz frazę "CR" wg kryterium: Temat


Tytuł:
On the local meromorphic extension of CR meromorphic mappings
Autorzy:
Merker, Joël
Porten, Egmont
Powiązania:
https://bibliotekanauki.pl/articles/1294226.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
CR generic currents
scarred CR manifolds
removable singularities for CR functions
deformations of analytic discs
CR meromorphic mappings
Opis:
Let M be a generic CR submanifold in $ℂ^{m+n}$, m = CR dim M ≥ 1, n = codim M ≥ 1, d = dim M = 2m + n. A CR meromorphic mapping (in the sense of Harvey-Lawson) is a triple $(f,_f,[Γ_f])$, where: 1) $f: _f → Y$ is a ¹-smooth mapping defined over a dense open subset $_f$ of M with values in a projective manifold Y; 2) the closure $Γ_f$ of its graph in $ℂ^{m+n} × Y$ defines an oriented scarred ¹-smooth CR manifold of CR dimension m (i.e. CR outside a closed thin set) and 3) $d[Γ_f] = 0$ in the sense of currents. We prove that $(f,_f,[Γ_f])$ extends meromorphically to a wedge attached to M if M is everywhere minimal and $^ω$ (real-analytic) or if M is a $^{2,α}$ globally minimal hypersurface.
Źródło:
Annales Polonici Mathematici; 1998, 70, 1; 163-193
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-solvability of the tangential ∂̅-system in manifolds with constant Levi rank
Autorzy:
Zampieri, Giuseppe
Powiązania:
https://bibliotekanauki.pl/articles/1207981.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
CR manifolds
∂̅ and $∂̅^b$ problems
tangential CR complex
Opis:
Let M be a real-analytic submanifold of $ℂ^n$ whose "microlocal" Levi form has constant rank $s^{+}_{M} + s^{-}_{M}$ in a neighborhood of a prescribed conormal. Then local non-solvability of the tangential ∂̅-system is proved for forms of degrees $s^{-}_{M}$, $s^{+}_{M}$ (and 0).
 This phenomenon is known in the literature as "absence of the Poincaré Lemma" and was already proved in case the Levi form is non-degenerate (i.e. $s^{-}_{M} + s^{+}_{M} = n - codim M$). We owe its proof to [2] and [1] in the case of a hypersurface and of a higher-codimensional submanifold respectively. The idea of our proof, which relies on the microlocal theory of sheaves of [3], is new.
Źródło:
Annales Polonici Mathematici; 2000, 74, 1; 291-296
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozdzielanie chromu (III/VI) w układzie z immobilizowaną membraną ciekłą (SLM)
Chromium (III/VI) separation in SLM system
Autorzy:
Religa, P.
Rajewski, J.
Łobodzin, P.
Świetlik, R.
Powiązania:
https://bibliotekanauki.pl/articles/2071557.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
Cr(III)
Cr(VI)
SLM
transport selektywny
selective transport
Opis:
W pracy zbadano wpływ stężenia Cr(VI) na selektywny rozdział Cr(III/VI) przez SLM. Jako przenośników użyto DNNSA oraz D2E11PA. Membrana zarówno z DNNSA, jak i D2EHPA stanowiła selektywną barierę dla jonów Cr(VI). Wzrost początkowego stężenia Cr(VI) wpływał negatywnie na transportu Cr(III). Zastosowaniu badanej membrany umożliwia selektywne wydzielanie Cr(lII) z rozcieńczonych roztworów Cr(VI).
In this study the influence of concentration of Cr(Vl) for selective distribution of Cr(III/VI) by SLM was investigated. DNNSA and D2EI1PA were used as a carriers. SLM with DNNSA or D2EIIPA was selective barrier for Cr(VI). The increase of initial Cr(Vl) concentration negative influenced on Cr(Iil) transport. Selective separation of Cr(lII) from dilute solution of Cr(VI) for system with tested membrane is possible.
Źródło:
Inżynieria i Aparatura Chemiczna; 2011, 5; 96-97
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Pressure on Magnetization of (Cd$\text{}_{1-x-y}$Zn$\text{}_{y}$Mn$\text{}_{x}$)$\text{}_{3}$As$\text{}_{2}$
Autorzy:
Bednarski, H.
Cisowski, J.
Lubczyński, W.
Voiron, J.
Portal, J. C.
Powiązania:
https://bibliotekanauki.pl/articles/1931965.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Cr
Opis:
The influence of hydrostatic pressure up to 0.6 GPa on magnetization of (Cd$\text{}_{1-x-y}$Zn$\text{}_{y}$Mn$\text{}_{x}$)$\text{}_{3}$As$\text{}_{2}$ with various compositions was studied at 4.2 K and in magnetic fields up to 7 T. The obtained experimental data were analysed within our generalized pair approximation model, treating the total Mn-Mn interaction strength as a sum of superexchange and the Bloembergen-Rowland exchange. As a result, we obtained satisfactory agreement between our approach and experiment by introducing a pressure dependence of p-d hybridization potential V$\text{}_{pd}$ in the form V$\text{}_{pd}$ ∝ d$\text{}^{-4}$, where d is the Mn-As bond length which decreases with pressure.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 205-208
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Ion-Channel Guiding on the Chaotic Electron Trajectories in a Free Electron Laser
Autorzy:
Saviz, S.
Mehdian, H.
Powiązania:
https://bibliotekanauki.pl/articles/2043369.pdf
Data publikacji:
2005-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.60.Cr
Opis:
It has been confirmed that when the equilibrium self-fields were taken into account, the motion of an electron in a helical wiggler with axial magnetic field may be chaotic. In this paper, the effect of an ion-channel guiding on the chaotic electron trajectories is analyzed. It is shown that the ion-channel guiding may modify the chaotic electron trajectories. It is also found that when the parameter ε, i.e. ε=ω$\text{}_{pb}^{2}$/4ω$\text{}_{c}^{2}$, is increased, the density of the ion-channel guiding, i.e. α$\text{}_{i}$=ω$\text{}_{pi}^{2}$/4ω$\text{}_{c}^{2}$, must be increased to keep the modification of the chaotic motion. The chaotic trajectories for constant parameter ε and increased density of the ion-channel guiding are presented. Numerical calculations are used to find the intersection between steady state group I and group II and resonance curves. Poincaré surface-of-section maps are generated to demonstrate the chaotic electron trajectories with axial magnetic field and its modification in the presence of an ion-channel guiding.
Źródło:
Acta Physica Polonica A; 2005, 107, 6; 895-906
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Susceptibility of the Rare Earth Ternary RNiSi$\text{}_{2}$ and RNiGe$\text{}_{2}$ Compounds
Autorzy:
Gil, A.
Szytuła, A.
Tomkowicz, Z.
Wojciechowski, K.
Zygmunt, A.
Powiązania:
https://bibliotekanauki.pl/articles/1929852.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Cr
Opis:
The ternary silicides and germanides RNiX$\text{}_{2}$ (R - rare earth, X = Si or Ge) with the orthorhombic CeNiSi$\text{}_{2}$-type structure are investigated by magnetometric measurements. CeNiSi$\text{}_{2}$, CeNiGe$\text{}_{2}$ and SmNiGe$\text{}_{2}$ have a nonmagnetic state in low temperatures. The compounds with R = Pr and Nd are ferromagnets while those containing R = Gd-Er are antiferromagnets. The de Gennes scaling of the Néel temperatures indicates a strong influence of the crystalline-electric field effects.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 271-274
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescence Properties of Europium in Sorbates of the Complexes with Naphthoic Acid on Zeolite
Autorzy:
Beltyukova, S. V.
Egorova, A. V.
Tselic, E. I.
Teslyuk, O. I.
Powiązania:
https://bibliotekanauki.pl/articles/2010950.pdf
Data publikacji:
1999-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
Opis:
A study of luminescence properties of sorbates of the europium(III) complexes with naphthoic acid and 1,10-phenanthroline on the zeolite of CaA-type that may be used as luminophores of the red color luminosity, has been performed. It was shown that the highest luminescence intensity in sorbate is observed upon the preliminary sorption of Eu(III) ion on zeolite following the treatment of naphthoic acid and 1,10-phenanthroline. The stability of sorbates to the temperature action was established (100°C, 2 h).
Źródło:
Acta Physica Polonica A; 1999, 95, 6; 977-982
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Efficiency of the Luminescence of Ytterbium(III) ß-Diketonates
Autorzy:
Meshkova, S. B.
Topilova, Z. M.
Bolshoy, D. V.
Beltyukova, S. V.
Tsvirko, M. P.
Venchikov, V. Ya.
Powiązania:
https://bibliotekanauki.pl/articles/2010953.pdf
Data publikacji:
1999-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
Opis:
The processes of the energy deactivation of electronic excitation in Yb(III) ß-diketonates and their dependence on the nature of ß-diketone and the second ligand as well as the environment and its state (complexes in organic solvents and polymer matrix) were studied. Taking as an example the ytterbium thenoyltrifluoroacetonate, it was shown that the energy losses in the ligand and Yb(III) ion, which is due to the high-frequency vibrations of the central C-H group of the ß-diketone, can lead to the decreased quantum yield of the luminescence. The increase in the medium rigidity causes the decrease in losses in the ligand, but does not affect the deactivation of the Yb(III) ion excited level. In the mix-ligand complexes the second ligand (1,10-phenanthroline) improves the screening of the central ion providing almost full transfer of the energy, absorbed by ligand, to ytterbium ion.
Źródło:
Acta Physica Polonica A; 1999, 95, 6; 983-990
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Thorium Ferricyanide
Autorzy:
Göbl, R.
Zentková, M.
Kavečanský, V.
Kováč, J.
Zentko, A.
Powiązania:
https://bibliotekanauki.pl/articles/2013694.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Cr
Opis:
The magnetic properties of Th$\text{}_{3}$[Fe(CN)$\text{}_{6}$]·10H$\text{}_{2}$O were investigated. It was shown that this compound is antiferromagnetically ordered in the low temperature region. The observed antiferromagnetic ordering is stable only in the low field.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 835-838
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forming of Ultrashort Electromagnetic Clusters by Two-Stream Superheterodyne Free Electron Lasers
Autorzy:
Kulish, V.V.
Lysenko, A.
Rombovsky, M.
Koval, V.
Volk, I.
Powiązania:
https://bibliotekanauki.pl/articles/1030315.pdf
Data publikacji:
2017-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.60.Cr
Opis:
We construct a cubic nonlinear self-consistent theory of multiharmonic two-stream superheterodyne free electron lasers of a klystron type, intended to form powerful ultrashort clusters of an electromagnetic field. Plural three-wave parametric resonant interactions of wave harmonics have been taken into account. The two-stream superheterodyne free electron lasers mode in which the first harmonic of a space-charge wave is much smaller than the critical frequency of two-stream instability has been used for forming of the powerful ultrashort clusters of electromagnetic waves. We carry out amplitude, phase and spectral analyses of the processes occurring in such devices. We found out the conditions necessary for the forming of the ultrashort clusters of an electromagnetic field. We demonstrate the possibility of the ultrashort electromagnetic cluster formation in the multiharmonic two-stream superheterodyne free electron lasers-type systems.
Źródło:
Acta Physica Polonica A; 2017, 131, 2; 213-221
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chaotic Electron Trajectories in a Planar Wiggler Free-Electron Laser
Autorzy:
Soleyman, A.
Mehdian, H.
Powiązania:
https://bibliotekanauki.pl/articles/2047085.pdf
Data publikacji:
2006-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.60.Cr
Opis:
The motion of an electron in a planar wiggler with an axial guide field is found to be nonintegrable. When taking into account the effects of self-fields of the beam, it is confirmed that the motion of an electron in a planar wiggler with a guide field may be chaotic. There is evidence of chaos from numerical calculations of nonzero Lyapunov exponents using different approaches of Benettin's method which are described and compared. Very accurate Poincaré maps are also performed.
Źródło:
Acta Physica Polonica A; 2006, 110, 4; 459-470
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear Theory of Plasma-Beam Superheterodyne Free Electron Laser of Dopplertron Type with Non-Axial Injection of Electron Beam
Autorzy:
Kulish, V.
Lysenko, A.
Oleksiienko, G.
Koval, V.
Rombovsky, M.
Powiązania:
https://bibliotekanauki.pl/articles/1377573.pdf
Data publikacji:
2014-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.60.Cr
Opis:
We have developed a quadratic nonlinear theory of a plasma-beam superheterodyne free electron laser of dopplertron type with the non-axial injection of an electron beam with respect to the guiding magnetic field. It is found out that the studied device can work in four different modes of operation. We determine the modes that have maximum gain coefficients of electromagnetic signals. It is shown that for all the operating modes the amplification factor of an electromagnetic signal is enhanced when the electron beam injection angle is increased.
Źródło:
Acta Physica Polonica A; 2014, 126, 6; 1263-1268
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis Of AE-Signal Generated During The Microhardness Measurement
Analiza sygnału EA generowanego podczas pomiarów mikrotwardości
Autorzy:
Piątkowska, A.
Pokorska, I.
Powiązania:
https://bibliotekanauki.pl/articles/328996.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
mikrotwardość
emisja akustyczna
warstwa Cr
microindentation
acoustic emission
Cr layer
Opis:
This paper presents the results of the measurements of microindentation using Vickers' indenter. The research was carried out with the system: the Cr layer layer deposited on silicon substrate and glass substrate. At the same time as the measurement of microindentation acoustic emission signals were recorded. The results of microindentation forces in the form of load-displacement curves and registered AE-time characteristics of the AE signals were compared with the SEM images of indentation. During the measurements, "burst" effects were observed as discontinuities of loading curve, that correlate with AE impulses. Rise of the maximal load resulted in the increase of damage and caused multiplication of AE pulses. Due to the fact the Cr layer was thin, most AE pulses were generated during the damaging of Si substrate. During the microindentation on Cr-glass system the transient AE signals were not registered.
W pracy zostały przedstawione wyniki pomiarów mikrotwardości z zastosowaniem wgłębnika typu Vickers. Badania przeprowadzono na próbkach z warstwą Cr na podłożu krzemowym i szklanym. Podczas pomiarów mikrotwardości jednocześnie rejestrowano generowane sygnały emisji akustycznej. Następnie porównano wyniki w postaci krzywej obciążania oraz sygnały emisji akustycznej i obrazy SEM odcisków wgłębnika. Zaobserwowane na krzywej obciążania nieciągłości zostały powiązane z pojawieniem się impulsów EA. Wzrost maksymalnego obciążenia wywołał zwiększenie liczby impulsów EA, odpowiednio do stopnia uszkodzenia materiału. Z analizy wykresów wynika, iż większość rejestrowanych uszkodzeń zachodziła w podłożu krzemowym. Pomiary mikrotwardości warstwy Cr na podłożu szklanym nie wywołały impulsowych sygnałów EA.
Źródło:
Diagnostyka; 2010, 1(53); 33-36
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ procesu sterylizacji parą wodną na odporność korozyjną stali Cr-Ni-Mo
Influence of steam sterilization on the corrosion resistance of Cr-Ni-Mo steel
Autorzy:
Marciniak, J.
Tyrlik-Held, J.
Walke, W.
Paszenda, Z.
Powiązania:
https://bibliotekanauki.pl/articles/285706.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
sterylizacja
stal Cr-Ni-Mo
sterilization
Cr-Ni-Mo steel
Źródło:
Engineering of Biomaterials; 2007, 10, no. 69-72; 90-93
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The service life of the repair welded joint of Cr-Mo / Cr-Mo-Y
Autorzy:
Sroka, M.
Zieliński, A.
Mikuła, J.
Powiązania:
https://bibliotekanauki.pl/articles/355828.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
creep
welded joint
Cr-Mo
Cr-M-V steel
residual life
Opis:
The service life of the repair welded joint of Cr-Mo / Cr-Mo-Y This paper presents the evaluation of the service life of dissimilar repair welded joint from Cr-Mo/Cr-Mo-V steel after 200,000 h service under creep condition. The investigations of microstructure using scanning electron microscopy, investigations of mechanical properties at room and elevated temperature as well as creep tests of the basic material from Cr-Mo and Cr-Mo-V steel and welded joint from these steels were carried out. The investigations allowed the tune of further safe operation of the repair welded joint in relation to the residual life of the materials to be determined. The evaluation of residual life and disposable residual life, and thus the estimation or determination of possible time of further safe operation, is crucial when the elements are operated much beyond the design work time.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1315-1320
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alteration of mélange-hosted chromitites from Korydallos, Pindos ophiolite complex, Greece: evidence for modification by a residual high-T post-magmatic fluid
Autorzy:
Kapsiotis, A. N.
Powiązania:
https://bibliotekanauki.pl/articles/138612.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ferrian chromite
Cr-spinel
metamorphism
Ophiolites
Pindos
spinel Cr
metamorfizm
ofiolity
Opis:
The peridotites from the area of Korydallos, in the Pindos ophiolitic massif, crop out as deformed slices of a rather dismembered sub-oceanic, lithospheric mantle section and are tectonically enclosed within the Avdella mélange. The most sizeable block is a chromitite-bearing serpentinite showing a mesh texture. Accessory, subhedral to euhedral Cr-spinels in the serpentinite display Cr# [Cr/(Cr + Al)] values that range from 0.36 to 0.42 and Mg# [Mg/(Mg + Fe2+)] values that vary between 0.57 and 0.62, whereas the TiO2 content may be up to 0.47 wt.%. The serpentinite fragment is characterized by low abundances of magmaphile elements (Al2O3: 0.66 wt.%, CaO: 0.12 wt.%, Na2O: 0.08 wt.%, TiO2: 0.007 wt.%, Sc: 4 ppm) and enrichment in compatible elements (Cr: 2780 ppm and Ni: 2110 ppm). Overall data are in accordance with derivation of the serpentinite exotic block from a dunite that was formed in the mantle region underneath a back-arc basin before tectonic incorporation in the Korydallos mélange. Two compositionally different chromitite pods are recognized in the studied serpentinite fragment, a Cr-rich chromitite and a high-Al chromitite, which have been ascribed to crystallization from a single, progressively differentiating MORB/IAT melt. Although both pods are fully serpentinized only the Al-rich one shows signs of limited Cr-spinel replacement by an opaque spinel phase and clinochlore across grain boundaries and fractures. Modification of the ore-making Cr-spinel is uneven among the Al-rich chromitite specimens. Textural features such as olivine replacement by clinochlore and clinochlore disruption by serpentine indicate that Cr-spinel alteration is not apparently related to serpentinization. From the unaltered Cr-spinel cores to their reworked boundaries the Al2O3 and MgO abundances decrease, being mainly compensated by FeOt and Cr2O3 increases. Such compositional variations are suggestive of restricted ferrian chromite (and minor magnetite) substitution for Cr-spinel during a short-lived but relatively intense, low amphibolite facies metamorphic episode (temperature: 400–700 °C). The presence of tremolite and clinochlore in the interstitial groundmass of the high-Al chromitite and their absence from the Cr-rich chromitite matrix imply that after chromitite formation a small volume of a high temperature, post-magmatic fluid reacted with Cr-spinel, triggering its alteration.
Źródło:
Acta Geologica Polonica; 2014, 64, 4; 473-494
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena trwałości resztkowej rur katalitycznych reformerów amoniaku badaniami NDT
Assessment of residual life of ammonia reformers catalytic pipes by NDT test
Autorzy:
Jasiński, W.
Powiązania:
https://bibliotekanauki.pl/articles/107896.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
reforming
stopy Fe-Cr-Ni
mikrostruktura
Fe-Ni-Cr alloys
microstructure
Opis:
The article presents the results of the stability of the microstructure and properties of catalytic cast pipes in steam reforming conditions. The growing prices of catalytic pipes have resulted in the attempts to prolong of the pipe work above 100,000 h stability. Increasing the time and temperature of operating causes coalescence and coagulation of secondary carbides reducing thus the creep resistance of the alloy. Currently there is no definite and commonly used method to assess the degree of degradation of the microstructure and properties of catalytic pipes. The destructive test methods of catalytic pipes are usually reduced to the assessment of the effects of metallographic creeping process, ie. relative volume and distribution of mikrovoids on the pipe wall section, as well as evaluating the mechanical properties of steel. These methods generally give a clear assessment but require disassembly for testing pipes and replace ment with new ones. The author developed the regression which show a significant dependence of mechanical properties (Rm A5, KCU 2) on the operating parameters of the reformer (PLM, σ) and hardness HB cast IN 519. The equations have been applied to assess the possibility of using non-destructive testing for the assessment of the degree of degradation of the catalyst steel pipe.
W artykule przedstawiono wyniki badań stabilności mikrostruktury i właściwości staliwa rur katalitycznych w warunkach reformingu parowego. Wzrastające ceny rur katalitycznych doprowadziły do analizy możliwości przedłużenia czasu eksploatacji rur powyżej projektowej trwałości 100000 h. Zwiększenie czasu i temperatury eksploatacji powoduje koalescencję i koagulację węglików wtórnych, a tym samym zmniejszenie odporności na pełzanie stopu. Obecnie brak jest jednoznacznej i powszechnie stosowanej metody oceny stopnia degradacji mikrostruktury i właściwości staliwa rur katalitycznych. Niszczące metody badań rur katalitycznych sprowadzają sie zwykle do oceny metalograficznej efektów procesu pełzania, tzn. objętości względnej i rozmieszczenie mikropustek na przekroju ścianek rur, a także ocenę właściwości mechanicznych staliwa. Metody te dają na ogół jednoznaczną ocenę ale wymagają demontażu rur do badań i zastąpienie ich nowymi. Wykorzystując opracowane równania regresji wykazujące istotną statystycznie zależność właściwości mechanicznych (Rm, A5, KCU 2) od parametrów eksploatacyjnych reformera (PLM, σ) i twardości HB staliwa IN 519, wykazano możliwość zastosowania badań nieniszczących do oceny stopnia degradacji staliwa rur katalitycznych.
Źródło:
Badania Nieniszczące i Diagnostyka; 2016, 1-2; 57-61
2451-4462
2543-7755
Pojawia się w:
Badania Nieniszczące i Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The holomorphic extension of $C^k$ CR functions on tube submanifolds
Autorzy:
Boggess, Al
Powiązania:
https://bibliotekanauki.pl/articles/1294174.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
CR function
convex
tube
Opis:
We show that a CR function of class $C^k$, 0 ≤ k < ∞, on a tube submanifold of $ℂ^n$ holomorphically extends to the convex hull of the submanifold. The extension and all its derivatives through order k are shown to have nontangential pointwise boundary values on the original tube submanifold. The $C^k$-norm of the extension is shown to be no bigger than the $C^k$-norm of the original CR function.
Źródło:
Annales Polonici Mathematici; 1998, 70, 1; 35-42
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Special normal form of a hyperbolic CR-manifold in ℂ⁴
Autorzy:
Ežov, Vladimir
Schmalz, Gerd
Powiązania:
https://bibliotekanauki.pl/articles/1294219.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
CR-manifolds
invariants
classification
Opis:
We give a special normal form for a non-semiquadratic hyperbolic CR-manifold M of codimension 2 in ℂ⁴, i.e., a construction of coordinates where the equation of M satisfies certain conditions. The coordinates are determined up to a linear coordinate change.
Źródło:
Annales Polonici Mathematici; 1998, 70, 1; 99-107
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wpływu parametrów procesowych na transport chromu(III) w układzie z immobilizowaną membraną ciekłą
Analysis of process parameters influence on chromium(III) transfer in a system with supported liquid membrane
Autorzy:
Religa, P.
Gawroński, R.
Sobczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/2070739.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
DNNSA
SLM
Cr(III)
Opis:
W pracy zbadano wpływ stężenia przenośnika, wpływ temperatury oraz pH fazy zasilającej na kinetykę procesu transportu jonów chromu (III) przez ciekłe membrany unieruchomione stosując jako przenośnik kwas dinonylonaftalenosulfonowy (DNNSA). Wyraźny wpływ badanych parametrów na kinetykę transportu wskazuje, iż optymalne właściwości membran ciekłych ograniczone są do wąskiego przedziału parametrów procesowych charakterystycznych dla danego przypadku.
An influence of temperature, pH in the feed phase and carrier concentration in membrane on kinetics of chromium(III) ions transport through the supported liquid membrane consisting as a carrier di-no nylnaphtalenesulfonic acid (DNNSA) was investigated. A visible influence of each parameter on transport kinetics was observed. Optimum properties of liquid membrane are strongly restricted by process parameters, which are characteristic for a given case.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 5; 97-98
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical composition and alter ation of Cr-spinels from Meliata and Penninic serpentinized peridot ites (Western Carpathians and Eastern Alps)
Autorzy:
Mikuš, T.
Spišiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/2059536.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ultramafites
Cr-spinel
alteration processes
Opis:
Cr-spinel is a relatively wide spread accessory mineral in the Mesozoic ophiolites of the Western Carpathians (mainly in the Meliata Unit) and in the Penninic Unit (Rechnitz tectonic window group). Cr-spinel chemical composition in both these occurrences (Meliaticum, Penninicum) shows the lherzolitic character of the original ultrabasites. It was found impossible to distinguish the source rocks (peridotites) of these two oceanic domains on the basis of the chemical composition of the Cr-spinels. Many Cr-spinels from both tectonic units are af fected by various levels of alter ation (in general, decrease of Al2O3, Cr2O3, MgO, enrichment in FeO, Fe2O3, SiO2, locally also in MnO and ZnO).
Źródło:
Geological Quarterly; 2007, 51, 3; 257-270
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oznaczanie zawartości Cr(VI) w powłokach cynkowych, pasywowanych chromem
Cr(VI) assay in chrome-passivated zinc coatings
Autorzy:
Zalewska, I.
Sokołowska, W.
Karaś, A.
Jusis, A.
Powiązania:
https://bibliotekanauki.pl/articles/192116.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
Tematy:
Cr(VI)
Cr(III)
antykorozyjna powłoka ochronna
toksyczność
spektrofotometria
anticorrosion protective coating
toxicity
spectrophotometry
Opis:
W pracy przedstawiono metodykę oznaczania Cr(VI) w powłokach cynkowych, pasywowanych chromem w detalach samochodowych. Zgodnie z prawodawstwem Unii Europejskiej materiały i elementy pojazdów samochodowych dopuszczonych do ruchu po 1 lipca 2007 roku nie mogą zawierać Cr(VI) więcej niż 0,1 μg/cm2. Zakład Laboratorium Charakteryzacji Materiałów Wysokiej Czystości Z-1 w ITME jest jedynym w Polsce akredytowanym laboratorium, które w zakresie akredytacji opracowało procedurę dotyczącą analizy powłok cynkowych na obecność Cr(VI). Do oznaczenia Cr(VI) zastosowano metodę spektrofotometryczną.
The aim of this work was to present the methodology of assaying Cr(VI) in chrome-passivated zinc coatings in car parts. In accordance with the requirements of European Union legislation, the materials and components of vehicles put on the market after 1st July 2007 shall not contain Cr(VI) over 0,1 μg/cm2. The Department of High Purity Materials Characterization Z-1 in ITME is the only accredited laboratory in Poland which developed its own procedure for zinc coating analysis within the scope of accreditation. The method applied to assay Cr(VI) was spectrophotometry.
Źródło:
Materiały Elektroniczne; 2011, T. 39, nr 3, 3; 30-33
0209-0058
Pojawia się w:
Materiały Elektroniczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and abrasive wear resistance of 18Cr-4Ni-2.5Mo cast steel
Autorzy:
Kalandyk, B.
Powiązania:
https://bibliotekanauki.pl/articles/380296.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stal wysokostopowa Cr-Ni
mikrostruktura
wykres CTPc
zużycie ścierne
highly alloyed Cr-Ni cast steel
microstructure
equivalent Cr and Ni
CCT diagrams
abrasive wear
Opis:
An influence of a decreased Cr content on the microstructure of the highly alloyed Cr-Ni cast steel, duplex type, melted under laboratory conditions, was characterized in the paper. The microstructure investigations were performed in the initial state and after the heat treatment (solution annealing) at 1060 C as well as the phase transformation kinetics at continuous cooling was measured. The wear resistance of the investigated cast steel was tested and compared with the 24%Cr-5%Ni-2.5%Mo cast steel. The Cr content decrease, in ferritic-austenitic cast steels (duplex), from 24-26%Cr to 18% leads to the changes of the castings microstructure and eliminating of a brittle \sigma phase. In dependence of the casting cooling rate, apart from ferrite and austenite, also fine martensite precipitates occur in the casting structure. It was shown that the investigated cast steel is characterised by a slightly lower wear resistance than the typical cast steel duplex grades.
Źródło:
Archives of Foundry Engineering; 2012, 12, 4; 81-84
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel method for thermodynamic study on the binding of milk carrier protein of BLG-A with Cr+3
Autorzy:
Behbehania, G.R.
Divsalar, A.
Saboury, A.A.
Powiązania:
https://bibliotekanauki.pl/articles/778861.pdf
Data publikacji:
2009
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
BLG-A
Cr+3
izotermiczna kalorymetria miareczkowa
kalorymetria
Cr3+
isothermal titration calorimetry
binding parameters
Opis:
Thermodynamics of the interaction between Cr3+ with β-lactoglobulin type A (BLG-A) was investigated at pH 7.0 and 37°C by isothermal titration calorimetry. A new method to follow the effect of Cr3+ on the stability of BLG-A was introduced. The new solvation model was used to reproduce the enthalpies of BLG-A+ Cr3+ interactions over the whole range of Cr3+ concentrations. The solvation parameters recovered from the new equation are attributed to the structural change of BLG-A and its biological activity. The results obtained indicate that there is a set of two identical binding sites for Cr3+ ions with positive cooperativity. The association equilibrium constants are 14.39 and 0.49 mM-1 for the first and second binding site, respectively. The enthalpy of binding for one mole of Cr+3 ion to one mole of the binding site on BLG-A (ΔH=104.60 kJ mol-1) is obtained.
Źródło:
Polish Journal of Chemical Technology; 2009, 11, 4; 24-29
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seizing Effect in the Roller Burnishing Process
Autorzy:
Gambin, W.
Powiązania:
https://bibliotekanauki.pl/articles/1945251.pdf
Data publikacji:
1996-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.10.Cr
68.35.Gy
Opis:
Micrographs of metal surface layers after the roller burnishing process show that while about 90% of surface layer thickness is displaced forwards of a roller motion, a thin contact zone undergoes a backward displacement. This seizing effect is caused by a softening of the contact zone due to overheating of the material, during high speed rolling, or due to the plastic strain cumulation in the layer after multiple rolling repetition. The effect is responsible for a peeling and cracking of surface layers during the burnishing process. The plastic analysis of the process taking into account the above effect is presented in the paper. The proposed slip-line field and corresponding velocity field are modification of the simplified solution for the rolling of the rigid-plastic half-space given by Collins.
Źródło:
Acta Physica Polonica A; 1996, 89, 3; 371-375
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of Al$\text{}_{x}$Ga$\text{}_{1-x}$As$\text{}_{y}$Sb$\text{}_{1-y}$ Epitaxial Layers
Autorzy:
Świątek, K.
Piskorski, M.
Piotrowski, T. T.
Powiązania:
https://bibliotekanauki.pl/articles/1952715.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.66.Fd
Opis:
Photoluminescence spectra of Al$\text{}_{x}$Ga$\text{}_{1-x}$As$\text{}_{y}$Sb$\text{}_{1-y}$ layers (x = 0.2-0.5, y = 0.02-0.03) grown by liquid-phase epitaxy on GaSb substrates were studied in a wide temperature range (14-295 K). The temperature changes of energy and intensity of the layer and substrate emission were measured. Linear part of the temperature-induced energy shift of the Al$\text{}_{0.20}$Ga$\text{}_{0.80}$As$\text{}_{0.02}$Sb$\text{}_{0.98}$ band-to-band emission exhibits a slope of -0.3 meV/K and -0.45 meV/K at temperatures 150 K and 295 K, respectively.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 1100-1102
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth of GaN Metalorganic Chemical Vapour Deposition Layers on GaN Single Crystals
Autorzy:
Pakula, K.
Baranowski, J. M.
Stępniewski, R.
Wysmołek, A.
Grzegory, I.
Jun, J.
Porowski, S.
Sawicki, M.
Starowieyski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1933937.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Fd
78.55.Cr
Opis:
The homoepitaxial growth of GaN layers has been achieved for the first time. Bulk GaN single crystals which have been used as a substrate have been grown from diluted solution of atomic nitrogen in the liquid gallium at 1600°C and at nitrogen pressure of about 15-20 kbar. It is shown that a terrace growth of GaN epitaxial layer has been realized. The high quality of the GaN film has been confirmed by luminescence measurements. The analysis of donor-acceptor and exciton luminescence is presented.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 861-864
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of Mechanics of Metal Surface Layers
Autorzy:
Gambin, W.
Skalski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1943988.pdf
Data publikacji:
1996-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.10.Cr
68.35.Gy
Opis:
Mechanics of metal surface layers deals with a description of the following objects, quantities and processes: structures and mechanical properties of metal surface layers after a heat, chemical, electro-chemical or physical treatment; evolution of these structures and properties during mechanical treatments; mechanical behaviour of the layers during exploitation processes. This branch of mechanics is based on the results of physical investigations, but it uses a mechanical approach. In the paper, descriptions of metal surface layers within the classical anisotropic plasticity, large strain plasticity, and finally, the crystal and polycrystal plasticity are recalled. Problems connected with a formulation of laws governing a surface layer behaviour are comprehensively discussed.
Źródło:
Acta Physica Polonica A; 1996, 89, 2; 145-154
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magneto-Optical Studies of Quantum States of Two-Dimensional Hole Gas at Single Ga$\text{}_{1-x}$Al$\text{}_{x}$As/GaAs Heterojunction
Autorzy:
Bryja, L.
Powiązania:
https://bibliotekanauki.pl/articles/2038213.pdf
Data publikacji:
2004-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
71.70.Di
Opis:
The detailed studies of low temperature (T=2~K) polarization resolved photoluminescence and photoluminescence excitation studies from heavily modulation doped Ga$\text{}_{1-x}$Al$\text{}_{x}$As/GaAs single heterojunctions in continuous wave and time-resolved conditions are reported. The free conduction band GaAs electrons recombination with two-dimensional holes observed in low magnetic fields enabled us to determine experimentally the valence subband Landau levels. The high magnetic field photoluminescence spectra are dominated by excitonic transitions which are attributed to neutral excitons rather than to positively charged ones.
Źródło:
Acta Physica Polonica A; 2004, 106, 2; 131-140
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of InAs Quantum Dots
Autorzy:
Willander, M.
Zhao, Q. X.
Jacob, A. P.
Wang, S. M.
Wei, Y. Q.
Powiązania:
https://bibliotekanauki.pl/articles/2035579.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Hc
78.55.Cr
Opis:
InAs quantum dots grown on GaAs substrate were investigated by optical spectroscopy. We particularly emphasized on the photoluminescence intensity, the stability of the photoluminescence intensity versus temperatures and wavelength of the InAs dot emission at various thermal treatments and different structures. We found that hydrogen can strongly passivate nonradiative centers without causing any structure degradation, and both n- and p-type modulation doping can reduce the decrease in the photoluminescence intensity when the sample temperature increases from the helium temperature to room temperature. The emission wavelength and the efficiency of the InAs quantum dots can also be manipulated by choosing proper materials of cap layer.
Źródło:
Acta Physica Polonica A; 2002, 102, 4-5; 567-576
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Layer-Type Compounds TlGdS$\text{}_{2}$ and TlGdSe$\text{}_{2}$
Autorzy:
Duczmal, M.
Pawlak, L.
Pokrzywnicki, S.
Powiązania:
https://bibliotekanauki.pl/articles/2013695.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ee
75.30.Cr
Opis:
Ternary thallium lanthanide dichalcogenides TlLnX$\text{}_{2}$ (X = S, Se, or Te; Ln = lanthanide, except Ce and Pr) crystallize in the rhombohedral structure of α-NaFeO$\text{}_{2}$ type ($R\overline{3}m$). Their crystal lattice consists of the layers of Ln$\text{}^{3+}$ ions separated by three layers of the non-magnetic ions (-Ln-X-Tl-X-Ln-). The magnetization was measured in the field range 0-14 T. The molecular field constants λ$\text{}_{m}$ were estimated by fitting the Brillouin function to the experimental magnetization plots. The difference between the λ$\text{}_{m}$ values for the thallium gadolinium sulphide and the selenide corresponds to the different character of Gd-S and Gd-Se bonds and gives rise to the different J$\text{}_{1}$ and J$\text{}_{2}$ exchange integrals.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 839-842
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solid-State Cavity Quantum Electrodynamics Using Quantum Dots
Autorzy:
Gérard, J. M.
Gayral, B.
Moreau, E.
Robert, I.
Abram, I.
Powiązania:
https://bibliotekanauki.pl/articles/2027452.pdf
Data publikacji:
2001-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Dv
78.55.Cr
Opis:
We review the recent development of solid-state cavity quantum electrodynamics using single self-assembled InAs quantum dots and three-dimensional semiconductor microcavities. We discuss first prospects for observing a strong coupling regime for single quantum dots. We then demonstrate that the strong Purcell effect observed for single quantum dots in the weak coupling regime allows us to prepare emitted photons in a given state (the same spatial mode, the same polarization). We present finally the first single-mode solid-state source of single photons, based on an isolated quantum dot in a pillar microcavity. This optoelectronic device, the first ever to rely on a cavity quantum electrodynamics effect, exploits both Coulomb interaction between trapped carriers in a single quantum dot and single mode photon funneling by the microcavity.
Źródło:
Acta Physica Polonica A; 2001, 100, 2; 129-143
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of $Ho_{5}Ni_{2}In_{4}$
Autorzy:
Tyvanchuk, Yu.
Penc, B.
Szytuła, A.
Zarzycki, A.
Powiązania:
https://bibliotekanauki.pl/articles/1538371.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Cr
75.30.Kz
Opis:
X-ray diffraction and magnetic measurements of $Ho_{5}Ni_{2}In_{4}$ are reported. This compound crystallizes in the orthorhombic $Lu_{5}Ni_{2}In_{4}$-type structure. Magnetic data indicate ferromagnetic properties below $T_c$ = 30 K.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 599-600
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Barite Effect on Radiation Shielding Properties of Cotton-Polyester Fabric
Autorzy:
Akkurt, İ.
Emikönel, S.
Akarslan, F.
Günoğlu, K.
Kilinçarslan, Ş.
Üncü, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1402530.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.82.Cr
81.05.-t
Opis:
Since creation of universe there has been radiation around us and this rate is getting higher with the development of technology. Thus radiation shielding becomes important subject for researcher. Besides normal people especially radiation workers in nuclear facilities need extra protection from radiation. This is vital if we think about any kind of nuclear leakage or nuclear attack, fabric becomes very important. For this purpose, cotton-polyester type of fabric has been coated by barite and gamma ray attenuation efficient has been obtained. The fabric was coated in different rate of barite (0%, 40%, 50% and 60%) in order to test effect of barite rate on the fabric. The measurement has been performed for gamma ray energy of 511, 662, and 835 keV using gamma spectrometer system with NaI(Tl) detector. It was found that the attenuation coefficient has increased with the barite coating rate on fabric.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-53-B-54
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single GaN/AlGaN Quantum Dot Spectroscopy
Autorzy:
Surowiecka, K.
Wysmołek, A.
Stępniewski, R.
Bożek, R.
Pakuła, K.
Baranowski, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/2047382.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.67.Hc
Opis:
Microphotoluminescence of low-density GaN/Al$\text{}_{x}$Ga$\text{}_{1-x}$N quantum dots grown by metal-organic vapor phase epitaxy using in situ etching of AlGaN is presented. The detailed analysis of the emission from these structures enables the observation of pairs of lines separated by the energy up to 3 meV. They behave in a different way under different excitation power that suggests that this doublet structure can be associated with the exciton and trion (or biexciton recombination). It is observed that for different quantum dots the energy of the charged exciton complex emission could be higher or lower than the neutral exciton one. It is discussed in terms of a competition between attractive e-h and repulsive e-e (h-h) Coulomb interaction that occurs because of the existence of the built-in electric field that separates electrons and holes in the dot.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 233-236
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temporal Evolution of Multi-Carrier Complexes in Single GaN/AlGaN Quantum Dots
Autorzy:
Surowiecka, K.
Wysmołek, A.
Stępniewski, R.
Bożek, R.
Pakuła, K.
Baranowski, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/2044542.pdf
Data publikacji:
2005-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.67.Hc
Opis:
Microphotoluminescence of low-density GaN/Al$\text{}_{x}$Ga$\text{}_{1-x}$N quantum dots grown by metal-organic vapor phase epitaxy using in situ etching of AlGaN is presented. The narrow lines in the microphotoluminescence spectra due to the single quantum dots are observed. Both energy and intensity of these lines show temporal fluctuations. Statistical analysis based on the correlation matrix allowed us to identify objects, which are affected by photo-induced electric field fluctuations. Relations between emission lines participating in the spectrum are discussed.
Źródło:
Acta Physica Polonica A; 2005, 108, 5; 879-884
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Spins in Self-Assembled (In,Ga)As/GaAs Quantum Dots Studied by Pump-Probe Faraday Rotation
Autorzy:
Greilich, A.
Yugova, I. A.
Oulton, R.
Zhukov, E. A.
Yakovlev, D. R.
Bayer, M.
Shabaev, A.
Efros, Al. L.
Stavarache, V.
Reuter, D.
Wieck, A. D.
Powiązania:
https://bibliotekanauki.pl/articles/2046975.pdf
Data publikacji:
2006-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.67.Hc
Opis:
Static and dynamic properties of electron spins in self-assembled (In,Ga)As/GaAs quantum dots which contain on average a single electron per dot were studied by pump-probe Faraday rotation. Examples given here are the g-factor tensor components as well as the dephasing time T*$\text{}_{2}$ within a dot ensemble.
Źródło:
Acta Physica Polonica A; 2006, 110, 3; 287-293
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Odporność korozyjna powłok wielowarstwowych Cr/CrN osadzanych metodą ARC PVD
Corrosive resistance of type Cr/CrN coatings deposited by arc-vacuum method
Autorzy:
Rogowska, R.
Rogowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/310857.pdf
Data publikacji:
2013
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
odporność korozyjna
Cr/CrN
corrosive resistance
Opis:
W artykule przedstawiono wyniki badań odporności korozyjnej powłok wielowarstwowych Cr/CrN. Powłoki wielowarstwowe Cr/CrN o różnym stosunku grubości Cr do CrN (od 0,2 do 1,0) osadzone metodą łukowo-próżniową na stali W302 poddano elektrochemicznym badaniom korozyjnym w 0,5 molowym roztworze NaCl. Przeprowadzono badania stałoprądowe a także elektrochemiczną spektroskopię impedancyjną. Wykorzystując wyniki badań elektrochemicznych wyliczono porowatość badanych powłok oraz wyznaczono obwody zastępcze. Wykazano brak zależności odporności korozyjnej badanych powłok wielowarstwowych od stosunku grubości warstw Cr/CrN.
The article presents the results of corrosion resistance of multilayer Cr/CrN. Multiple coatings of Cr/CrN with different thickness ratio of Cr to CrN (from 0,2 to 1,0), deposition by arc-vacuum method on W302 steel were investigated by electrochemical corrosive test in 0,5 molar NaCl solution. DC studies were performed as well as electrochemical impedance spectroscopy. The results of performed electrochemical studies were used to calculate the porosity of investigated coatings and to determine equivalent circuits. Consequently the study showed no connection between corrosion resistance of multilayer coatings and the ratio of the thickness of Cr/CrN layers.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2013, 14, 3; 1227-1239
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Hydrostatic Pressure on InP:Yb Luminescence
Autorzy:
Stąpor, A.
Kozanecki, A.
Reimann, K.
Syassen, K.
Weber, J.
Moser, M.
Scholz, F.
Powiązania:
https://bibliotekanauki.pl/articles/1886707.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
78.55.Cr
Opis:
Tle effects of hydrostatic pressure on the InP:Yb luminescence were explored using a gasketed diamond anvil cell (DAC). The pressure dependence of the Yb$\text{}^{3+}$ luminescence shows a small positive shift (0.96 meV/GPa) at low pressures (< 4 GPa) and a negative one (-0.04 meV/GPa) above 4 GPa. The spectra of the Yb$\text{}^{3+}$ emission differ markedly in these two pressure ranges. It was concluded that intra-4f-shell transitions of the Yb$\text{}^{3+}$ on indium substitutional (Td) site dominate in the spectrum above 4 GPa, whereas at lower pressures the emission has a different nature.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 315-318
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Simple Localized-Itinerant Model for PrAl$\text{}_{3}$: Crystal Field and Exchange Effects
Autorzy:
Von Ranke, P. J.
Palermo, L.
Da Silva, X. A.
Powiązania:
https://bibliotekanauki.pl/articles/1891680.pdf
Data publikacji:
1991-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Dg
75.30.Cr
Opis:
We present a simple magnetic model for PrAl$\text{}_{3}$. The effects of crystal field are treated using a reduced set of levels and the corresponding wave functions are extracted from the actual crystal field levels of Pr$\text{}^{+3}$ in a hexagonal symmetry. The exchange between 4f- and conduction-electrons are dealt within a molecular field approximation. An analytical magnetic state equation is derived and the magnetic behaviour discussed. The parameters of the model are estimated from a fitting of the inverse susceptibility of PrAl$\text{}_{3}$ given in the literature.
Źródło:
Acta Physica Polonica A; 1991, 80, 4; 583-590
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Electric Field and Carrier Localization on Carrier Dynamics in AlGaN Quantum Wells
Autorzy:
Mickevičius, J.
Tamulaitis, G.
Kuokštis, E.
Shur, M.
Yang, J.
Gaska, R.
Powiązania:
https://bibliotekanauki.pl/articles/1811960.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.67.De
Opis:
Dynamics of nonequilibrium carriers in high-Al-content AlGaN/AlGaN multiple quantum wells was studied. A set of multiple quantum wells with well widths varying from 1.65 to 5.0 nm was grown by metal-organic chemical vapor deposition. The structures were investigated by photoluminescence spectroscopy under quasi-steady-state conditions. The observed blueshift of the photoluminescence band peak was attributed to the screening of the built-in electric field. The integrated photoluminescence intensity dependence on excitation and temperature showed a strong influence of carrier localization.
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 1247-1252
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometrically Frustrated Kagome Lattice with Chemical Disorder
Autorzy:
Szymczak, R.
Baran, M.
Fink-Finowicki, J.
Krzymanska, B.
Aleshkevych, P.
Szymczak, H.
Powiązania:
https://bibliotekanauki.pl/articles/1813765.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Cr
75.20.-g
Opis:
The effect of nonmagnetic $Mg^{2+}$ and magnetic $Co^{2+}$ doping in Kagome compounds was investigated using DC magnetic susceptibility. The main effect of doping is to change the crystal field parameters. It was shown that $Co^{2+}$ doping increases considerably crystal field parameters in $Ni_3V_2O_8$ while doping with nonmagnetic $Mg^{2+}$ ions decreases considerably crystal field parameters in $Co_3V_2O_8$ crystals.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 413-416
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fine Structure of the Localized Emission from GaInNAs Layers Studied by Micro-Photoluminescence
Autorzy:
Kudrawiec, R.
Latkowska, M.
Sęk, G.
Misiewicz, J.
Ibáñez, J.
Henini, M.
Hopkinson, M.
Powiązania:
https://bibliotekanauki.pl/articles/1791353.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.66.Fd
Opis:
GaInNAs bulk-like layers ( ≈ 20% In and ≈ 3% N) grown on GaAs substrate with various crystallographic orientations have been studied by micro-photoluminescence at low temperatures for a broad range of excitation conditions. In addition to photoluminescence peaks, which are associated with heavy- and light-hole free exciton recombination, a band of sharp lines was observed below the fundamental free exciton transition at low excitation. It shows that the localized emission which is typical of this alloy at low temperatures is composed of individual narrow photoluminescence lines which are associated with the recombination of single excitons. They can be localized on various local potential minima including those originating from the alloy content fluctuations and/or deep acceptor(donor)-like complexes.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 930-932
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time Evolution of the Microluminescence Energy οf GaN/AlGaN Quantum Dots
Autorzy:
Surowiecka, K.
Wysmołek, A.
Stępniewski, R.
Bożek, R.
Pakuła, K.
Baranowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1791354.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.67.Hc
Opis:
Time evolution of the microphotoluminescence from low-density GaN/$Al_{x}Ga_{1-x}N$ quantum dots grown by metal organic chemical vapor deposition using in situ etching of AlGaN is presented. The observed effect is related to the energy changes that begin immediately after sample illumination with the exciting laser light and saturate after some time. Typically, the luminescence energy decreases and the change is exponential with characteristic times in a range between several dozen and several hundred seconds. However, sometimes we observed the energy increase with characteristic times in a range between several and a few hundred seconds. The obtained results are discussed in terms of the metastable change of the electric field, induced by spontaneous polarization present in GaN/AlGaN structure (in the growth direction), and strain- or defect-induced changes of the electric field in the vicinity of the dot.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 933-935
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Znaczenie i rozwój psychologii nadziei w ujęciu Charlesa Richarda Snydera
The psychology of hope: meaning and development according to the theory of Charles Richard Snyder
Autorzy:
Kwiatek, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/495140.pdf
Data publikacji:
2012
Wydawca:
Towarzystwo Naukowe Franciszka Salezego
Tematy:
Hope
positive psychology
C.R. Snyder
Opis:
What is hope, does it belong to any cognitive structure of the mind or rather is it a kind of human feeling? The aim of this paper is to describe the theory of hope according to C.R. Snyder (1944–2006). This contemporary point of view has provided a lot of inspiration for many studies in a variety of different fields. Undoubtedly, the reality of hope has a big impact on educational performance, health condition, stress management and adaptive skills. It is not only a life-line in times of emergency or strife, when humans have to cross some difficulties in life, but it is also the daily force to live in the present. Hope according to Snyder is a three dimensional construct of the integrated cognitive process (willpower, waypower and goal direction). The applicability and power of this construct lies in its potential to change the general level of hope in individual lives and social groups, not just in the future, but in the present.
Źródło:
Seminare. Poszukiwania naukowe; 2012, 31; 157-170
1232-8766
Pojawia się w:
Seminare. Poszukiwania naukowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Chronic Dose Assessment of Three Critical Organs for Liver Scintigraphy with Using Cr-51
Autorzy:
Maranci, Ö.
Tugrul, A.
Powiązania:
https://bibliotekanauki.pl/articles/1031760.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Cr-51
dosimetry
phantom
scintigraphy
TRIGA
Opis:
In this study, a dosimetric study was observed by using Cr-51 gamma radioisotope on liver scintigraphy. In this context, the source organ is determined as liver and it is aimed the evaluation of measuring doses from source organ to selected three critical organs (thyroid, gonad, and brain). An antropomorphic torso phantom has been preferred in the experiments. The measurements of critical organs doses were examined for chronic effects. Moreover, the chronic effect of Cr-51 radioisotope on critical organs was determined as cumulative dose. Thermoluminescent dosimeters were used for chronic dose assessment. In the experiments, lithium fluoride (LiF) (TLD-100) detectors were used and they were provided from Turkish Atomic Energy Authority - Cekmece Nuclear Research and Training Center and calibrated in there. Within this study, the evaluation of the cumulative doses by using Cr-51 for three critical organs was observed with an original setup by using anthropomorphic torso phantom experimentally.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 476-478
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of $(Cu_{x}Mn_{1-x})_3[Cr(CN)_6]_2$ · $zH_2O$ Complexes
Autorzy:
Vavra, M.
Antoňák, M.
Jagličić, Z.
Mihalik, M.
Csach, K.
Zentková, M.
Powiązania:
https://bibliotekanauki.pl/articles/1535120.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
75.30.Cr
Opis:
Magnetization measurements were performed on the $(Cu_{x}Mn_{1-x})_3[Cr(CN)_6]_2$ · $zH_2O$ molecule-based magnets where x=0.0, 0.2, 0.25, 0.3, 0.35 0.4, 0.6, 0.8 and 1.0. Both the Curie temperature and saturated magnetization at first decrease with increasing value of x reaching the minimal value of $T_{C}$ = 49.7 K and 0.17 $μ_{B}$ for x=0.2 and then increase with substitution. The pronounced hysteretic behavior between zero-field cooled and field cooled regimes was observed for all samples. Magnetization changes the sign of magnetic polarization in zero-field cooled magnetization curve at the compensation temperature $T_\text{comp}$ = 16 K for sample with x = 0.4. Our results indicate that the system behaves as mixed-ferri-ferromagnetic system.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 998-999
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generation of Intense Free-Electron Laser Radiation in the Terahertz Regime
Autorzy:
Pinhasi, Y.
Lurie, Y.
Pinhasi, G.
Friedman, A.
Powiązania:
https://bibliotekanauki.pl/articles/1401876.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.60.Cr
52.59.Rz
Opis:
Free-electron lasers are high power radiation sources that utilize a distributed interaction between an accelerated electron beam and the electromagnetic field. In these devices, the electron beam serves as the amplification medium generating electromagnetic radiation, while propagating in a periodic magnetic structure called "wiggler" or "undulator". When electrons pass in the wiggler, they oscillate and act as a moving dipole emitting a wave packet of undulator synchrotron radiation. Incoherent summation of the wave packets results in a spontaneous emission. When the electrons are bunched into a short pulse, they all emit their wave packets in the same phase. The radiation wave packets combine coherently, resulting in super-radiance (where the energy radiated is proportional to the square of the electric charge). Such short bunches can be generated by an RF linear accelerator, driven by a photocathode injector. The radiation wavelength is determined by the velocity of the electrons and the spatial period of the undulator. The super-radiance mechanism enables the generation of intense radiation in frequency bands, whereas conventional sources fail to produce a powerful coherent radiation. In this article, we describe the design and analysis of ultrashort pulse free-electron laser operating at the sub-millimeter and terahertz regimes. The free-electron laser is based on a magnetostatic planar wiggler, in which super-radiant emission is emanated by accelerated electron bunches. A three-dimensional, space-frequency theory is developed in order to study radiation excitation in the wiggler. The total electromagnetic field (radiation and space-charge waves) is presented in the frequency domain as an expansion in terms of transverse eigenmodes of the (cold) cavity, in which the field is excited and propagates. The mutual interaction between the electron beam and the electromagnetic field is fully described by coupled equations, expressing the evolution of mode amplitudes and electron beam dynamics. The approach is applied in a numerical particle code WB3D, simulating wide-band interaction of a free-electron laser operating in the linear and non-linear regimes. The model is utilized to study spontaneous and super-radiant emissions radiated by an electron bunch at the sub-millimeter regime, taking into account three-dimensional space-charge effects emerging in such ultrashort bunches.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 315-318
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fine Structure of Neutral Excitons in Single GaAlAs Quantum Dots
Autorzy:
Molas, M.
Gołasa, K.
Piętka, B.
Potemski, M.
Babiński, A.
Powiązania:
https://bibliotekanauki.pl/articles/1403612.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.67.Hc
Opis:
Optical anisotropy of neutral excitons in GaAlAs/AlAs quantum dots is investigated. Low-temperature polarization-sensitive photoluminescence measurements of single quantum dots are performed. It is found that neutral excitons (X) in the quantum dots exhibit a fine structure splitting. The fine structure splitting ranges from 10 μeV to 100 μeV and correlates with the X energy. The polarization axis of the fine structure splitting is well oriented along [110] crystallographic direction of a substrate. The orientation is attributed to the elongation of GaAlAs/AlAs quantum dots in the [110] direction of the substrate.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 988-990
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Fine Structure of a Triexciton in Single InAs/GaAs Quantum Dots
Autorzy:
Molas, M.
Gołasa, K.
Furman, M.
Lapointe, J.
Wasilewski, Z.
Potemski, M.
Babiński, A.
Powiązania:
https://bibliotekanauki.pl/articles/1403615.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.67.Hc
Opis:
Results of experimental study of multiexcitonic emission related to the p-shell of single self-assembled InAs/GaAs quantum dots are presented. Optical properties of a first emission line to appear from the p-shell of a strongly excited quantum dots are investigated using low-temperature polarization-sensitive micro-photoluminescence measurements. The emission line is attributed to the recombination of a complex of three electrons and holes confined in a dot (neutral triexciton), 3X. It is found that the emission consists of two linearly polarized components and the fine structure splitting is larger than the respective splitting of a neutral exciton. The optical anisotropy of the 3X emission is related to the anisotropy of the quantum dot localizing potential. The axis of the 3X optical anisotropy changes from dot to dot covering broad range within ± 50 degrees with respect to the axis defined by the optical anisotropy of a neutral exciton (X). Possible origin of the deviation is discussed.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 991-993
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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