Temat: Mn - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Microstructure evaluation of Ni-Mn-Ga alloy
Mikrostruktura stopu Ni-Mn-Ga
Autorzy:: Flaga, S.
Kata, D.
Sapiński, B.
Powiązania:: https://bibliotekanauki.pl/articles/368870.pdf
Data publikacji:: 2010
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: MSMA
stop Ni-Mn-Ga
Ni-Mn-Ga alloy
Opis:: This paper summarises the applications of MSMA materials, outlines the mechanism of magnetic shape memory effect and provides the procedure for microstructure evaluation of samples as well as the results of microstructure analysis using the example of the Ni-Mn-Ga alloy.
W artykule scharakteryzowano zastosowania materiałów z magnetyczną pamięcią kształtu (MSMA). Opisano mechanizm działania magnetycznej pamięci kształtu. Przedstawiono procedurę mikroskopowej oceny próbki i jej wyniki na przykładzie stopu Ni-Mn-Ga.
Źródło:: Mechanics and Control; 2010, 29, 1; 6-10
2083-6759
2300-7079
Pojawia się w:: Mechanics and Control
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Superconducting and Microstructural Properties of (Mg+2B)+MgB$\text{}_{2}$/Cu Wires Obtained by High Gas Pressure Technology
Autorzy:: Kario, A.
Morawski, A.
Głowacki, B. A.
Łada, T.
Smaga, M.
Diduszko, R.
Kolesnikov, D.
Zaleski, A. J.
Kondrat, A.
Gajda, D.
Powiązania:: https://bibliotekanauki.pl/articles/2047331.pdf
Data publikacji:: 2007-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 84.71.Mn
Opis:: In order to improve the overall critical current characteristics of Cu sheathed in situ MgB$\text{}_{2}$ wires a special architecture of the wire, and processing parameters were used. The study presents the influence of the ex situ MgB$\text{}_{2}$ chemical barrier between ex situ core and Cu, suppressing the reaction of Cu with Mg. Wires, doped with 10 at.% SiC of 18 nm average grain size, were fabricated from MgH$\text{}_{2}$ and B or from Mg and B powders, using the powder-in-tube method. The methods of rotary swaging or drawing were used as the alternating wire-forming processes. The samples were annealed under high Ar gas pressure (hot isostatic pressing) at 750ºC and 1.0 GPa for 15 and 30 min. A significant difference in Cu distribution across the wires for a long and short time of sintering was observed. The formation of microstructure in the powder-in-tube process and the relationship between the microstructure and critical current density J$\text{}_{c}$ values, are discussed in this paper.
Źródło:: Acta Physica Polonica A; 2007, 111, 5; 693-703
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: AC Susceptibility of the $YBa_2Cu_3O_7$ Coated Conductor in High Magnetic Fields
Autorzy:: Seiler, E.
Frolek, L.
Powiązania:: https://bibliotekanauki.pl/articles/1813703.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 84.71.Mn
Opis:: The AC susceptibility of the $YBa_2Cu_3O_7$ coated conductor in the perpendicular applied AC magnetic field was investigated using an inductive experimental setup with a pair of coils connected in opposite. A harmonic homogeneous AC magnetic field was applied perpendicularly to the wide face of the $YBa_2Cu_3O_7$ coated tape. Together with this AC field, a parallel background DC magnetic field up to 14 T was applied perpendicularly to the tape. The measurements were performed at several constant temperatures in the range 3-50 K. In the region of high background DC fields (8-14 T) no influence of the tape's ferromagnetic substrate was detected, despite of the low measurement temperatures employed. The estimate of the critical current density $(j_c)$ at 20 K and 14 T, based on the position of the imaginary AC susceptibility peak, gives the value $j_c$=0.53 MA/$cm^2$.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 379-382
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Pinning Force in Superconducting Wires Nb-Ti
Autorzy:: Gajda, D.
Zaleski, A.
Dyakonov, V.
Matrosov, N.
Szymczak, H.
Beloshenko, V.
Spuskanyuk, V.
Chishko, V.
Powiązania:: https://bibliotekanauki.pl/articles/1537076.pdf
Data publikacji:: 2010-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 84.71.Mn
Opis:: In the paper we present the results of the measurements of critical current $I_{c}$ in NbTi wires. Experiments were made for the wires of 0.3 mm in diameter and the length of 25 mm. The wires were produced by means of two methods: conventional (hydroextrusion and drawing) and preliminary equal channel multiple angle pressing. The samples were heat treated at different temperatures. We describe the influence of different pinning centers on critical current density $J_{c}$.
Źródło:: Acta Physica Polonica A; 2010, 118, 2; 364-365
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Relation between Current Transfer Length and Stability of Fe/$MgB_2$ and Fe/Nb/$MgB_2$ Conductors
Autorzy:: Holúbek, T.
Kováč, P.
Hušek, I.
Powiązania:: https://bibliotekanauki.pl/articles/1813693.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 84.71.Mn
Opis:: This paper treats and confronts the stability of two different composite $MgB_2$ superconductors and searches for relation between the current transfer length and maximum heat flux that conductor can withstand in operational DC regime. It was found that the iron sheathed wire behave more stably than tape-like conductor with outer iron sheath and inner niobium barrier.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 367-370
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Rare earth elements in Fe-Mn nodules from southern Baltic Sea – a preliminary study
Pierwiastki ziem rzadkich w konkrecjach Fe-Mn z południowego Bałtyku – badania wstępne
Autorzy:: Szamałek, K.
Uścinowicz, S.
Zglinicki, K.
Powiązania:: https://bibliotekanauki.pl/articles/2061649.pdf
Data publikacji:: 2018
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: konkrecje Fe-Mn
Bałtyk
REE
Fe-Mn nodules
Baltic Sea
Opis:: Between 1976–1990, the Polish Geological Institute performed geological works in the Polish Maritime Areas. During these works, 260 occurrences of concretions were recorded from 7,500 sampled sites. In 1980, the threshold that separates the Bornholm Basin from the Słupsk Furrow was mapped. Numerous Fe-Mn nodules on the seabed were found in that area. The results of detailed analyses of nodule samples collected from four sites are presented in this paper. Analyzed nodules represent discoidal D, irregular I, and transitional D-I types. The nodules are characterized by varied chemical composition of main oxides (Fe, Mn). The maximum Fe2O3 content is 26.63% and MnO 23.18%. Total average amount of REE + Y in the samples is approximately 165.11 ppm, ΣLREE 145.72 ppm and ΣHREE 19.39 ppm. The LREE content is enriched in comparison to HREE. The majority of nodules consist of Fe-Mn oxy-hydroxide minerals with very low crystallinity (practically amorphous phases). The main confirmed Mn-phases are birnessite and todorokite. Other main components of the nodules are: detrital quartz, albite, microcline, glauconite and muscovite, clinochlore, and clay minerals: illite and chlorite. The rate of growth of Fe-Mn nodules has been estimated using a cobalt chronometer. The nodule growth rate ranges from 0.006 to 0.134 mm/yr –1. Based on the Fe, Mn and (Cu + Co + Ni) contents, the origin of studied nodules is determined as hydrogenetic, while using REE (Cesn/Cesn • vs. Nd) – as diagenetic.
W latach 1976–1990 Państwowy Instytut Geologiczny realizował prace geologiczne na Polskich Obszarach Morskich. Opróbowano 7500 miejsc, a w 260 stwierdzono występowanie konkrecji. W roku 1980 prace kartograficzne prowadzono m.in. na obszarze progu oddzielającego Basen Bornholmski od Rynny Słupskiej, gdzie stwierdzono występowanie licznych konkrecji Fe-Mn. W niniejszym artykule są prezentowane wyniki analiz konkrecji pobranych na 4 stanowiskach. Badania dotyczą konkrecji następujących typów: dyskoidalnych D, nieregularnych I oraz przejściowych D-I. Badane konkrecje charakteryzują się zmiennym składem głównych tlenków (Fe, Mn). Maksymalna zawartość Fe2O3 wynosi 26,63%, a MnO 23,18%. Łączna średnia zawartość REE + Y w badanych próbkach jest na poziomie 165,11 ppm, ΣLREE – 145,72 ppm i ΣHREE – 19,39 ppm. Zauważalne jest wzbogacenie w LREE w porównaniu do HREE. Konkrecje w większości są zbudowane z tlenków i wodorotlenków Fe i Mn o bardzo niskim stopniu krystaliczności (praktycznie fazy mineralne są amorficzne). Głównymi potwierdzonymi fazami manganu są birnessyt i todorokit. Pozostałymi głównymi składnikami konkrecji są: kwarc terygeniczny, albit, mikroklin, glaukonit i muskowit, klinochlor, minerały ilaste: illit, chloryt. Wartość tempa wzrostu w badanych konkrecjach, określona z użyciem chronometru kobaltowego, wynosi od 0,006 do 0,134 mm/yr –1. Na podstawie zawartości Fe, Mn oraz (Cu + Co + Ni) badane konkrecje określono jako hydrogeniczne, podczas gdy używając zależności REE (Cesn/Cesn • vs. Nd) jako diagenetyczne.
Źródło:: Biuletyn Państwowego Instytutu Geologicznego; 2018, 472; 199--212
0867-6143
Pojawia się w:: Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Tunnel Current Features Caused by Defect Assisted Process in Resonant-Tunnelling Structures
Autorzy:: Belyaev, A. E.
Vitusevich, S. A.
Glavin, B. A.
Konakova, R. V.
Dobrowolski, W.
Mąkosa, A.
Kravchenko, L. N.
Gornev, E. S.
Powiązania:: https://bibliotekanauki.pl/articles/1947897.pdf
Data publikacji:: 1996-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.Gk
85.30.Mn
Opis:: An extra channel of electron tunnelling through a double-barrier resonant-tunnelling GaAs/AlGaAs heterostructure caused by impurity assisted tunnelling was identified. We argue that it is due to DX centres associated with dopant donor atoms which diffused into the AlGaAs barrier layer.
Źródło:: Acta Physica Polonica A; 1996, 90, 4; 727-730
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Three- versus Two-Dimensional Electron Gas Injection in Resonant Tunnelling
Autorzy:: Figielski, T.
Wosiński, T.
Mąkοsa, A.
Kaniewska, M.
Regiński, K.
Powiązania:: https://bibliotekanauki.pl/articles/1933735.pdf
Data publikacji:: 1995-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.Gk
85.30.Mn
Opis:: A small "precursor" of resonance is observed before the main resonance peak in the current-voltage characteristic of double-barrier resonant-tunnelling devices. The competition between the precursor and main-peak current is examined within the temperature range 4.2-400 K. The precursor is interpreted as 3DEG contribution to the resonant tunnelling dominated by a 2DEG injection from a triangular well formed under bias in the emitter spacer layer.
Źródło:: Acta Physica Polonica A; 1995, 88, 4; 707-710
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Traversal Time through Double-Barrier Resonant Tunneling Structure
Autorzy:: Figielski, T.
Powiązania:: https://bibliotekanauki.pl/articles/1929681.pdf
Data publikacji:: 1993-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.Gk
85.30.Mn
Opis:: There are certain confusing statements in the literature concerning a physical time that is responsible for a high-frequency limit in operation of double-barrier resonant tunneling devices. Here, it is shown that an electron traversal time, introduced earlier by ours, exhibits no singularity on resonance and might be a good candidate for the quantity in question.
Źródło:: Acta Physica Polonica A; 1993, 84, 3; 587-589
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Indirect RKKY-Type Interaction by Direct Oxygen Hopping
Autorzy:: Rodriguez-Nuńez, J.
Coqblin, B.
Beck, H.
Konior, J.
Powiązania:: https://bibliotekanauki.pl/articles/1930566.pdf
Data publikacji:: 1994-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.Mn
74.25.Jb
Opis:: The three-band Emery model, describing the holes in the CuO$\text{}_{2}$ planes of the high-temperature superconducting oxides, is considered. The model includes the direct oxygen-oxygen hopping integral t$\text{}_{pp}$. The exact Bogolyubov transformation is used to exclude one oxygen band and obtain a two-dimensional Anderson model. Afterward, the effective Hamiltonian is obtained by eliminating the second oxygen band with the use of two approximate canonical transformations. The effective Hamiltonian describes the spins residing on the copper sites and interacting through an indirect interaction J$\text{}_{SX}$(R), where R is the distance between two copper ions. J$\text{}_{SX}$(R) depends on the doping rate δ and is a decaying function of R. Numerical results for J$\text{}_{SX}$(R) are given for different doping rates δ for the case of parabolic bands. The obtained interaction J$\text{}_{SX}$(R), when added to the original antiferromagnetic interaction (present in oxides at δ = 0), might lead to a frustration of the long-range antiferromagnetic ordering upon doping.
Źródło:: Acta Physica Polonica A; 1994, 85, 2; 317-322
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Importance of corporate governance for energy in sustainable development and evaluation with quantitative SWOT analysis
Autorzy:: Tugrul, B.
Cimen, S.
Powiązania:: https://bibliotekanauki.pl/articles/1068209.pdf
Data publikacji:: 2016-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 92.70.Mn
92.70.-j
Opis:: Human development goals should be meeting with sustaining the ability of natural systems to continue to provide the natural resources and ecosystem services upon which the economy and society that is "Sustainable Development". For this aim, corporate governance and related activities are important that broadly refers to the mechanisms, processes and relations by which corporations are controlled and directed. SWOT analysis is a method that considers Strengths and Weaknesses along with the Opportunities and Threats that exist in the incorporated body environment. Internal and external factors generate ideas about how their incorporated body might become more successful by using SWOT analysis. For logic comparison of these ideas, analytic hierarchy process was applied for SWOT analysis and important values of them were determined and evaluated rationally.
Źródło:: Acta Physica Polonica A; 2016, 130, 1; 87-89
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Spin Polaron-Bipolaron Scenario of Three Gap-Like Energy Scales in Superconducting Cuprates
Autorzy:: Wróbel, P.
Maciąg, A.
Suleja, W.
Eder, R.
Micnas, R.
Powiązania:: https://bibliotekanauki.pl/articles/1536806.pdf
Data publikacji:: 2010-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.Mn
74.72.Kf
Opis:: We argue that three gaps observed in underdoped cuprates can be attributed to the formation of antiferromagnetic spin polarons and bipolarons. Within the spin polaron scenario the antinodal pseudogap at he high energy scale originates from the change of the Fermi surface topology, induced by antiferromagnetic correlations. That change gives rise to the diminishing of the spectral weight at the antinodal region near the Brillouin zone boundary. We demonstrate that effect by analyzing effective models of doped antiferromagnets. The second type of pseudogap appearing at the intermediate energy scale originates from the phenomena which are precursory to superconductivity and predominantly concern the portion of the Fermi surface near the nodal region. In order to analyze the latter phenomenon we use the negative U Hubbard model, in which many details typical to spin polaron physics are neglected, but which contains the essential ingredient of it, that is the strong short range attraction. The lowest energy scale is related to the true superconducting gap which develops with doping, although both types of pseudogap diminish with doping. This behavior can be explained by the fact that the spin polaron band is empty in the undoped system and therefore the formation of the superconducting state in the system is forbidden. Due to a pedagogical character of this report, we present in the introduction a short overview of mostly recent experimental results which are related to the gap-pseudogap physics.
Źródło:: Acta Physica Polonica A; 2010, 118, 2; 292-298
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Checkerboard-Like Charge Ordering in Underdoped Cuprates
Autorzy:: Wróbel, P.
Powiązania:: https://bibliotekanauki.pl/articles/2046738.pdf
Data publikacji:: 2006-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.Mn
71.10.Fd
Opis:: Recent scanning tunneling microscopy measurements which indicate the formation of two-dimensional density modulations at some doping levels in cuprates were reviewed. A model of hard-core bosons which represent bound hole pairs in the two-dimensional doped antiferromagnet was discussed in the context of these experimental results. By means of an exact numerical diagonalization it was shown that the Coulomb repulsion between bosons brings about the formation of charge modulations.
Źródło:: Acta Physica Polonica A; 2006, 109, 4-5; 533-539
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Fragmentation of Co-Fe-Ta-B Soft Magnetic Amorphous Alloy
Autorzy:: Miškuf, J.
Csach, K.
Juríková, A.
Huráková, M.
Tabachnikova, E.
Powiązania:: https://bibliotekanauki.pl/articles/1387048.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.43.Dq
62.25.Mn
Opis:: The main limitation of high-strength Co-based bulk metallic glasses for their application as structural materials is the large brittleness. Spontaneously emerging cracks in the alloy degrade the magnetic properties. We analyzed the failure characteristics of $Co_{43}Fe_{20}Ta_{5.5}B_{31.5}$ bulk soft magnetic metallic glass deformed in the compression at room temperature and the low strain rate. Under loading the amorphous structure stores high elastic energy. During the failure this energy is released and the alloy breaks into small particles or powder exhibiting a fragmentation mode.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 558-560
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Fine Structure of Resonant-Tunneling Peak in GaAs/AlAs Double-Barrier Heterostructure
Autorzy:: Vitusevich, S. A.
Figielski, T.
Mąkosa, A.
Wosiński, T.
Belyaev, A. E.
Konakova, R. V.
Kravchenko, L. N.
Powiązania:: https://bibliotekanauki.pl/articles/1872937.pdf
Data publikacji:: 1995-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.Gk
85.30.Mn
Opis:: For the first time we observed a fine oscillatory structure, with the period of 36 mV, of the resonant tunneling peak in the current-voltage characteristic of a double-barrier heterostructure. We attribute it to a sequential single-phonon emission of ballistic electrons which tunneled out from the quantum well through the collector barrier.
Źródło:: Acta Physica Polonica A; 1995, 87, 2; 377-380
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 16.

Tytuł:: Analysis of the Corrosion Rate of FeMn-Si Biodegradable Material
Autorzy:: Roman, Ana-Maria
Chelariu, Romeu
Cimpoesu, Ramona
Stirbu, Ioan
Ionita, Iulian
Cazacu, Marius Mihai
Prisecariu, Bogdan Anton
Cimpoesu, Nicanor
Pietrusiewicz, Paweł
Sodor, Alina
Powiązania:: https://bibliotekanauki.pl/articles/2174554.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: biodegradable
Fe-Mn alloy
degradation rate
Opis:: The Fe-based alloy with manganese led to the appearance of new austenitic alloys, with the antiferromagnetic property pursued, resulting in compatibility with the magnetic field as that of magnetic resonance imaging. The corrosion resistance behavior of the biodegradable Fe-Mn-Si alloy was analyzed in a thermostatic chamber at 37±1°C for 24, 48 and 72 hours by immersing in Ringer solution. Also, the cast and laminated samples were subjected to electro-corrosion tests using a potentiostat equipment. Linear and cyclic potentiometry is presented for characterize the corrosion behavior of the experimental samples in electrolyte. Due to the interaction between the alloy and the liquid medium a change in the solution pH was observed. Structure analysis and chemical composition details of the surfaces were obtained using electron scanning microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS).
Źródło:: Archives of Metallurgy and Materials; 2022, 67, 4; 1243--1250
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 17.

Tytuł:: Rectification of Brownian Particles with Oscillating Radii in Asymmetric Corrugated Channels
Autorzy:: Glavey, R.
Savel'ev, S.
Powiązania:: https://bibliotekanauki.pl/articles/1402559.pdf
Data publikacji:: 2015-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.40.-a
87.10.Mn
Opis:: Transport of a Brownian particle with an oscillating radius freely diffusing in an asymmetric corrugated channel was simulated over a range of driving forces for a series of temperatures and angular frequencies of radial oscillation. It was observed that there was a strong influence of self-oscillation frequency on the average particle velocity. This effect can be used to control rectification of biologically active particles as well as for their separation according to their activity, for instance in the separation of living and dead cells.
Źródło:: Acta Physica Polonica A; 2015, 128, 2; 159-162
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 18.

Tytuł:: Failure Behaviour of Fe- and Co-Based Amorphous Soft Magnetic Ribbons
Autorzy:: Miškuf, J.
Csach, K.
Juríková, A.
Janák, G.
Švec, T.
Konč, M.
Powiązania:: https://bibliotekanauki.pl/articles/1813535.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.43.Dq
62.25.Mn
Opis:: Fractographic analysis of Co- and Fe-based high strength soft magnetic materials showed the high localization of the plastic deformation and the ductility in narrow shear bands. The estimated fracture toughness of these materials is closely associated with the scale of the local plastic zone.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 95-98
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 19.

Tytuł:: Inelastic Electron Scattering in Double-Barrier Resonant Tunneling Structure Revealed with Photoexcitation
Autorzy:: Figielski, T.
Mąkosa, A.
Wosiński, T.
Harness, P. C.
Singer, K. E.
Powiązania:: https://bibliotekanauki.pl/articles/1929767.pdf
Data publikacji:: 1993-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.Gk
85.30.Mn
Opis:: We investigated current-voltage and photocurrent-voltage characteristics of a double-barrier resonant tunneling structure based on AlGaAs. To explain the observed "double-step" feature of the characteristics, we have proposed a mechanism including a multiple phonon emission of an electron dwelling in the quantum well.
Źródło:: Acta Physica Polonica A; 1993, 84, 4; 817-819
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 20.

Tytuł:: Application of Statistical Spin Liquid Concept to High-Temperature Superconductivity
Autorzy:: Byczuk, K.
Spałek, J.
Powiązania:: https://bibliotekanauki.pl/articles/1930571.pdf
Data publikacji:: 1994-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.27.+a
74.20.Mn
Opis:: We apply the concept of statistical spin liquid, in which the doubly occupied quasimomentum configurations {|k⇅⟩} for quasiparticles are excluded from the Fock space, to a planar superconductor with real space pairing. The results compare very well with experimental data for the cuprates, namely (i) the condensed state appears only for the number of holes 0 < δ < 0.15-0.25; (ii) the temperature dependence of the gap is close to the BCS result, but the gap has systematically lower value and is of an extended s-wave form.
Źródło:: Acta Physica Polonica A; 1994, 85, 2; 337-340
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 21.

Tytuł:: Electron Spectrum and Dieleclric Susceptibility of the Hubbard Model with Local Lattice Anharmonicity
Autorzy:: Stasyuk, I. V.
Shvaika, A. M.
Powiązania:: https://bibliotekanauki.pl/articles/1930577.pdf
Data publikacji:: 1994-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.Mn
71.45.Gm
Opis:: The investigation of single-electron spectrum of the Hubbard model with local lattice anharmonicity is performed. The influence of the interaction with the vibrational subsystem on the effective exchange constant is considered. The static transverse dielectric susceptibility of the model is calculated. Analysis of the possible dielectric anomalies is performed on this basis.
Źródło:: Acta Physica Polonica A; 1994, 85, 2; 363-366
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 22.

Tytuł:: Coherent and Sequential Tunneling in High Magnetic Field
Autorzy:: Belyaev, A. E.
Vitusevich, S. A.
Maude, D.
Portal, J. C.
Powiązania:: https://bibliotekanauki.pl/articles/1968012.pdf
Data publikacji:: 1997-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.Gk
85.30.Mn
Opis:: In the resonant tunneling diode incorporating a wide one-sided spacer layer, an oscillation picture has been studied in both polarities of the applied voltage in high magnetic field. The results lead to the conclusion that the interference between the electron waves running in the forward direction and the ones reflected at some potential step can occur in both the emitter and collector regions. The characteristic lengths corresponding to the path of the ballistic motion of electrons were estimated. An exchange enhancement of the electronic g-factor in two-dimensional systems was observed.
Źródło:: Acta Physica Polonica A; 1997, 92, 4; 704-708
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 23.

Tytuł:: Capacitance Spectroscopy of Single-Barrier GaAs/AlAs/GaAS Structures Containing InAs Quantum Dots
Autorzy:: Belyaev, A. E.
Eaves, L.
Main, P. C.
Polimeni, A.
Stoddart, S. T.
Henini, M.
Powiązania:: https://bibliotekanauki.pl/articles/1969042.pdf
Data publikacji:: 1998-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.Gk
85.30.Mn
Opis:: An electrostatic profile of single-barrier heterostructures with InAs quantum dots encased into barrier has been studied. The role of growth conditions and structure's design is investigated. The charging state and position of energy levels for InAs quantum dots embedded in AlAs matrix are discussed.
Źródło:: Acta Physica Polonica A; 1998, 94, 2; 245-249
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 24.

Tytuł:: Unconventional Superconductivity, Spontaneous Time-Reversal Symmetry Breaking and Lowering of Kinetic Energy in Doped, Short-Range Antiferromagnets
Autorzy:: Wróbel, P.
Maciąg, A.
Eder, R.
Fulde, P.
Micnas, R.
Powiązania:: https://bibliotekanauki.pl/articles/2038385.pdf
Data publikacji:: 2004-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.Mn
71.10.Fd
Opis:: In this paper we focus on the anomalous temperature dependence of the in-plane conductivity and symmetry mixing of the superconducting order parameter observed in various experiments on cuprates. We show that the one-band Hubbard model is not capable of describing the physics of cuprates because the kinetic energy is lowered in this model in the superconducting state, which contradicts experimental observations. The proper model to investigate doped, short-range antiferromagnets is the t-J model, for which our results agree with experiments. We analyze a spin polaron model, that is an effective model for a doped antiferromagnet. In the framework of this model we also study the superconducting order-parameter symmetry-mixing phenomenon. We show that the expected mixing of d-wave symmetry with p-wave symmetry takes place in the superconducting order-parameter at a finite value of the doping parameter. This symmetry mixing brakes the time-reversal symmetry.
Źródło:: Acta Physica Polonica A; 2004, 106, 5; 575-581
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 25.

Tytuł:: Magnetically Controlled Interference of Ballistic Electrons Tunnelled throughout the Double-Barrier Resonator
Autorzy:: Figielski, T.
Wosiński, T.
Mąkosa, A.
Dobrowolski, W.
Vitusevich, S. A.
Belyaev, A. E.
Powiązania:: https://bibliotekanauki.pl/articles/1950748.pdf
Data publikacji:: 1996-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.Gk
85.30.Mn
Opis:: An effect of magnetic field normal to the tunnel current on the amplitude and phase of the fine oscillatory structure, discovered in the resonance current-voltage curve in double-barrier AlAs/GaAs heterostructures, has been examined. All the obtained results are consistently explained in terms of the interference of ballistic electrons, escaped from the quantum well, in the collector part of the structure.
Źródło:: Acta Physica Polonica A; 1996, 90, 4; 781-784
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 26.

Tytuł:: Effect of Magnetic Field on Fine Structure of Tunnel Current in Double-Barrier Resonant-Tunneling Devices
Autorzy:: Belyaev, A. E.
Vitusevich, S. A.
Glavin, B. A.
Mąkosa, A.
Dobrowolski, W.
Powiązania:: https://bibliotekanauki.pl/articles/1933716.pdf
Data publikacji:: 1995-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.Gk
85.30.Mn
Opis:: An effect of magnetic field on a fine oscillatory structure revealed in the resonant current flowing through double-barrier resonant-tunneling devices is examined. It is found that the observed variation of the fine structure in a magnetic field parallel to the current direction differs considerably from that appearing in tunnel current flowing through single-barrier structures. Experimental results are explained in terms of the quantum interference effect arising in structures having wide spacer layers.
Źródło:: Acta Physica Polonica A; 1995, 88, 4; 675-678
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 27.

Tytuł:: Nanoscale Fracture Morphologies of Soft Magnetic CoFeTaB Amorphous Alloy
Autorzy:: Miškuf, J.
Csach, K.
Juríková, A.
Huráková, M.
Powiązania:: https://bibliotekanauki.pl/articles/1367300.pdf
Data publikacji:: 2014-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.43.Dq
62.25.Mn
Opis:: We analyzed the failure characteristics of the bulk metallic glass $Co_{43}Fe_{20}Ta_{5.5}B_{31.5}$ (at.%) deformed by compression and by bending of the ribbons. Under the load the amorphous structure can store high elastic energy. The surface morphology of nanoscale fracture is in accord with the micromechanisms of the failure of the amorphous structure. The fracture surface consists of a smooth mirror cleavage zone and a river pattern zone with nanosized dimples, arranged in lines respecting the periodic corrugation zones, oriented perpendicular to the crack propagation direction. The presence of the failure initiation centers in the ribbon influences the dynamics of crack propagation and also the surface morphology of the fracture.
Źródło:: Acta Physica Polonica A; 2014, 126, 1; 96-97
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 28.

Tytuł:: The Kinetics of the Change of $SnO_{x}$ Thin Films Conductivity during the Gas-Adsorptive Interaction
Autorzy:: Zarapin, V.
Luhin, V.
Zukowski, P.
Koltunowicz, T.
Powiązania:: https://bibliotekanauki.pl/articles/1366165.pdf
Data publikacji:: 2014-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 68.43.Mn
73.61.Jc
Opis:: The subjects of investigation are thin semiconductor $SnO_{x}$ films received by thermal oxidation. The influence of gas environments on electrical conductivity of films were investigated by a static way by measurement of kinetic and equilibrium isotherm of adsorption of trimethylamine, alcohol, hydrogen sulfide and ammonia. The communication between a type isotherm of adsorption, chemical nature of gas and temperature is shown.
Źródło:: Acta Physica Polonica A; 2014, 125, 6; 1319-1322
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 29.

Tytuł:: Influence of Manganese and Manganese-Copper Catalysts Synthesis on Decomposition of Hydrogen Peroxide and Phenol Oxidation
Wpływ metod syntezy katalizatorów manganowych i manganowo--miedziowych na rozkład nadtlenku wodoru i utlenianie fenolu
Autorzy:: Sarbak, Z.
Powiązania:: https://bibliotekanauki.pl/articles/388319.pdf
Data publikacji:: 2009
Wydawca:: Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:: katalizatory Mn i Mn-Cu
rozkład nadtlenku wodoru
utlenianie fenolu
catalyst synthesis
hydrogen peroxide decomposition
phenol oxidation
Opis:: Characterization of performance of manganese and manganese-copper oxide catalysts obtained by different methods of synthesis is presented. The specific surface area and catalytic activity were determined in decomposition of hydrogen peroxide and phenol oxidation. The catalytic performance of the catalysts studied was different in the two reactions.
Przedstawiono wyniki badań nad wykorzystaniem tlenkowych preparatów manganowych i manganowo-miedziowych otrzymanych różnymi metodami syntezy. Dla otrzymanych preparatów wyznaczono wielkość powierzchni właściwej oraz określono aktywność katalityczną w rozkładzie nadtlenku wodoru i utlenianiu fenolu. Wykazano zróżnicowaną aktywność katalityczną preparatów w obu wymienionych reakcjach.
Źródło:: Ecological Chemistry and Engineering. A; 2009, 16, 11; 1451-1458
1898-6188
2084-4530
Pojawia się w:: Ecological Chemistry and Engineering. A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 30.

Tytuł:: Characterization of as-spun and annealed Al-Mn-Fe ribbons
Charakterystyka szybko chłodzonych taśm stopu Al-Mn-Fe w stanie wyjściowym oraz po wygrzewaniu
Autorzy:: Stan, K.
Lityńska-Dobrzyńska, L.
Góral, A.
Wierzbicka-Miernik, A.
Powiązania:: https://bibliotekanauki.pl/articles/354244.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: stopy Al-Mn-Fe
mikrostruktura stopu
taśmy stopów
Al-Mn-Fe
quasicrystals
melt-spinning
DSC
TEM
Opis:: Microstructure of conventionally cast and melt spun Al91Mn7Fe2 alloy was examined by X-ray diffraction, SEM and TEM techniques. Three different phases were found in a mould cast ingot: Al6(Mn, Fe), Al4(Mn, Fe) and aluminium solid solution. Rapidly quenched ribbons cast using melt spinning technique with different speed values of rotating wheel: 25, 30 and 36 m/s had average width in a range of 30-50 µ. It was found that ribbons contain quasicrystalline particles with different sizes and shapes including large dendrites in a range of micrometers and smaller spherical particles below 1 µ embedded in an aluminium matrix. Composition of these particles was similar to the Al4(Mn, Fe) phase. Also quasicrystals in the form of eutectic were observed with slightly different composition close to the Al6(Mn, Fe) phase. All observed particles revealed 2, 3 and 5- fold symmetry, typical for icosahedral quasicrystals. Increase in microhardness up to 274 HV for melt spun ribbon comparing to 141 HV for the as-cast ingot was observed due to a change in phase composition and refinement of the phases. Thermal stability of quasicrystalline phase in the ribbon was examined by annealing in different temperatures. Temperatures for thermal treatment were chosen based on DSC curve which contains the exothermic peak in the temperature range 300-500degrees Celsius. Analysis of ribbons annealed for 30 minutes at 400degrees Celsius showed that transformation of quasicrystals to stable crystalline phase starts at quasicrystal/Al-matrix interfaces. After annealing for 4 hours at 500degrees Celsius only the Al6(Mn, Fe) phase and aluminium solid solution were observed in the ribbon microstructure.
Mikrostrukturę stopu Al91Mn7Fe2 odlanego do kokili oraz przygotowanego metoda odlewania na wirujący walec (melt spinning) scharakteryzowano za pomocą dyfrakcji rentgenowskiej oraz transmisyjnej i skaningowej mikroskopii elektronowej. W strukturze wlewka zaobserwowano trzy fazy: Al6(Mn, Fe), Al4 (Mn, Fe) oraz roztwór stały aluminium. Szybko chłodzone taśmy odlano przy trzech różnych prędkościach obracającego się walca: 25, 30 i 36 m/s. Grubość wszystkich otrzymanych taśm wynosiła około 30-50 µm. Mikrostruktura taśm składała sie z cząstek kwazikrystalicznych o zróżnicowanych kształtach i rozmiarach (w tym dużych dendrytów rzędu kilku mikrometrów, oraz mniejszych kulistych cząstek poniżej 1µm). Skład chemiczny tych cząstek był zbliżony do składu fazy Al4(Mn, Fe). Zaobserwowano również kwazikryształy w postaci eutektyki o składzie zbliżonym do składu fazy Al6(Mn, Fe). Uzyskane dyfrakcje elektronowe z obserwowanych cząstek wykazywały symetrie 2, 3 i 5-krotna, typowa dla kwazikryształów ikozaedrycznych. Zmiany składu fazowego oraz rozdrobnienia faz spowodowały wzrost mikrotwardości z 140 HV dla stopu wyjściowego do wartości 270 HV dla taśm. Stabilność termiczna fazy kwazikrystalicznej badano poprzez wygrzewanie taśm w różnych temperaturach, które wybrano w oparciu o krzywa DSC zawierająca pik egzotermiczny w przedziale temperatur 300-500 stopni Celsjusza. Analiza mikrostruktury taśmy wygrzewanej przez 30 min w 400 stopniach Celsjusza wykazała, że przemiana fazy kwazikrystalicznej w stabilna fazę krystaliczna rozpoczyna sie na granicy kwazikryształ/osnowa. Po wygrzewaniu przez 4 godz. w 500 stopniach Celsjusza w strukturze taśmy występowała jedynie faza Al6(Mn, Fe) oraz roztwór stały aluminium.
Źródło:: Archives of Metallurgy and Materials; 2012, 57, 3; 651-656
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 31.

Tytuł:: Deposition of metals in glacial lake sediment
Autorzy:: Jurković, Josip
Velagić Habul, Esma
Dӧrfler, Walter
Omanoviń-Miklicanin, Enisa
Hamidović, Saud
Ivanković, Anita
Powiązania:: https://bibliotekanauki.pl/articles/762953.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:: sediment, correlation, PCA, age, Mn/Fe ratio
Opis:: The aim of this research was to find the relationship between metals content and age of the sediment and to estimate the contamination level. For the research of sediment, samples were taken from the glacial Lake Prokosko. Concentrations of eight elements (Ca, Mg, Fe, Cd, Pb, Zn, Cu and Mn) were determined. The age was determined with usage of C14. For statistical evaluation of the results, we used basic statistical tools, correlation, and PCA. The results showed that all of investigated metals have natural origin. Sediment core from this research was around 18,000 years old and the results revealed characteristics of metals deposition in the process of sedimentation. Concentrations of metals were compared with age (depth) of sediment. Maximal concentrations for iron, calcium, magnesium and manganese are found in the period of Allerӧd oscilation. Differences in Mn/Fe ratio and organic matter content are showing changes through history. These results show metal deposition characteristics in different climate periods, and these characteristics could be used as another proof of climate change.
Źródło:: Polish Journal of Soil Science; 2018, 51, 2
0079-2985
Pojawia się w:: Polish Journal of Soil Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 32.

Tytuł:: Effect of Variable Manganese Content on Microstructure of Al-Cu Alloys
Autorzy:: Stąpór, S.
Górny, M.
Kawalec, M.
Gracz, B.
Powiązania:: https://bibliotekanauki.pl/articles/355992.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Al-Cu-Mn alloys
microstructure
macrostructure
DSC
Opis:: The presented access the influence of Mn content (0-0.94 wt.%) on the course of the cooling curves, phase transformation, macrostructure, and microstructure of Al-Cu alloys for three series: initial (Series I), with the addition of an AlTi master (Series II), and modified with AlTi5B1 (Series III). The maximum degree of undercooling ΔT was determined based on the cooling curves. The surface density of the grains (N_A ) was determined and associated with the inverse of solidification interval 1/ΔT_k . Titanium (contained in the charge materials as well as the modifier) has a significant effect on the grinding of the primary grains in the tested alloys. A DSC thermal analysis allowed for the determination of phase transition temperatures under conditions close to equilibrium. For series II and III, the number of grains decreases above 0.2 wt.% Mn with a simultaneous increase in solidification interval 1/ΔT₂ . The presence of Al₂ Cu eutectics as well as the Cu-, Fe-, and Mn-containing phases in the examined samples was demonstrated using scanning electron microscopy.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 4; 1377-1383
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 33.

Tytuł:: Magnetic transformation in Ni-Mn-In Heusler alloy
Autorzy:: Kuzma, M.
Maziarz, W
Stefaniuk, I.
Powiązania:: https://bibliotekanauki.pl/articles/146235.pdf
Data publikacji:: 2015
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: ferromagnetic resonance
Heusler alloy
Ni-Mn-In
Opis:: Magnetic properties of a Ni50Mn35.5In14.5 Heusler ribbon were studied by ferromagnetic resonance (FMR) in the temperature range of 335–100 K. In the temperature region of 265–170 K, the FMR signal disappeared, in spite of the fact that this region comprised the main crystal transformation temperatures: Ms, Mf, As, Af. In the austenite crystal state, a weak antiferromagnetic interaction was observed, whereas ferromagnetism was detected in the low temperature martensitic state.
Źródło:: Nukleonika; 2015, 60, No. 3, part 1; 435-438
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 34.

Tytuł:: Charakterystyka kawitacyjna laserowo obrabianych napoin Fe-Cr-Mn
Cavitation characteristic of laser processed Fe-Cr-Mn clad
Autorzy:: Szkodo, M.
Powiązania:: https://bibliotekanauki.pl/articles/257940.pdf
Data publikacji:: 2006
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:: erozja kawitacyjna
napoina Fe-Cr-Mn
obróbka laserowa
Fe-Cr-Mn clad
laser processing
cavitation
cavitation erosion
Opis:: W pracy przedstawiono badania odporności kawitacyjnej napoin chromowo-manganowych w dwóch przypadkach: bez dodatkowej obróbki powierzchniowej oraz po przetapianiu powierzchni napoiny wiązką lasera CO2 o mocy 1000 W. Stwierdzono, że obróbka laserowa zmniejszała zdolność do umacniania warstwy wierzchniej pod wpływem obciążeń kawitacyjnych w porównaniu z nieobrobionym laserowo materiałem. Przeprowadzone badania wskazują również na to, że laserowe przetapianie zmniejsza głębokość umocnionej warstwy pod wpływem działania obciążeń kawitacyjnych.
In the work is presented the cavitation erosion test of Fe-Cr-Mn clad in two cases: without laser processing and after melting using 1000 W CO2 laser beam. It was found that laser processing decrease susceptibility to work hardening of the eroded material under cavitation loading and also decrease depth of strengthened surface layer.
Źródło:: Problemy Eksploatacji; 2006, 1; 123-130
1232-9312
Pojawia się w:: Problemy Eksploatacji
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 35.

Tytuł:: Konkrecje Fe-Mn z polskiego sektora Morza Bałtyckiego : stan wiedzy i potrzeba badań
Fe-Mn nodules from the Polish sector of the Baltic Sea : state of knowledge and need for research
Autorzy:: Zglinicki, Karol
Uścinowicz, Szymon
Łęczyński, Leszek
Szamałek, Krzysztof
Jegliński, Wojciech
Pączek, Urszula
Bylina, Paweł
Banaś, Michał
Powiązania:: https://bibliotekanauki.pl/articles/2076172.pdf
Data publikacji:: 2021
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: morze Bałtyckie
osady morskie
konkrecje Fe-Mn
surowce krytyczne
Baltic Sea
marine sediments
Fe-Mn nodules
critical raw materials
Opis:: Studies on Baltic nodules have been undertaken since the1920s. In the 1970sand 1980s, the Polish Geological Institute - National Research Institute conducted researches on the bottom sediments of the Baltic Sea, which allowed identifying the regions of occurrence of Fe-Mn nodules in the southern part of the Baltic Sea (Mojski, 1989-1994). Nodules from the Polish Baltic Sea Zone are the least studied element of the marine environment. So far, there is a lack of information on environmental-geological conditions of formation and occurrence of nodules, their metal resources and deposit potential. The Fe-Mn nodules may be a valuable source of information on the contamination of the Baltic Sea water and bottom sediments. In cooperation between the Institute of Oceanography of the University ofGdañsk and the Polish Geological Institute-NRI, two research cruises were carried out in August and September 2020 on a 5 X 5 km testing ground in the Gotland-Gdańsk Threshold region. The seabed surface was profiled using multibeam echo sounders and a side-scan sonar. A hundred samples of Fe-Mn nodules, 25 samples of surface sediments associated with the nodules, and25 samples of clay rocks underlain by marine sediments were collected. The extensive documentary material will enable, for the first time, to estimate the nodule resources and determine the regularity of their occurrence.
Źródło:: Przegląd Geologiczny; 2021, 69, 3; 161--168
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 36.

Tytuł:: Stewia (Stevia rebaudiana Bertoni) jako źródło wybranych mikroelementów
Stevia (Stevia rebaudiana Bertoni) as a source of selected micronutrients
Autorzy:: Gęsiński, K.
Majcherczak, E.
Gozdecka, G.
Powiązania:: https://bibliotekanauki.pl/articles/2072621.pdf
Data publikacji:: 2013
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: stewia
mikroelementy
Fe
Cu
Mn
Zn
stevia
micronutrients
Opis:: W pracy analizowano zawartość wybranych mikroelementów (Fe, Cu, Mn i Zn) w produktach stewii, będących w sprzedaży: tabletek oraz suszonych, w pełni wykształconych liści, które porównywano z młodymi liśćmi oraz cukrem. Stewia charakteryzuje się dużą zawartością badanych mikroelementów. Największą stwierdzono w młodych liściach stewii. Starsze liście zawierają mniejsze ich ilości, ale stanowią również bogate ich źródło. Z analizowanych produktów stewii tabletki zawierają znacznie mniej mikroelementów niż produkt nieprzetworzony w postaci suszonych liści. Cukier zawiera tylko śladowe ilości mikroelementów.
The study analyzed a content of selected trace elements (Fe, Cu, Mn and Zn) in stevia products such as tablets and dried, fully developed leaves being on sale, which were then compared with young leaves and sugar. Stevia is characterized by a high content of micronutrients. The highest content was found in young leaves of stevia. Older leaves contain smaller quantities of micronutrients but still represent a rich source of them. Among analyzed stevia products the tablets contain much less micronutrient than the raw product in a form of dried leaves. Sugar contains only a trace amount of micronutrients.
Źródło:: Inżynieria i Aparatura Chemiczna; 2013, 2; 74-75
0368-0827
Pojawia się w:: Inżynieria i Aparatura Chemiczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 37.

Tytuł:: Contact Stress Simulation for Mg-0.5Ca-xMn Alloys used for Medical Application
Autorzy:: Nastasa, Roxana Oana
Tufescu, Ana
Munteanu, Corneliu
Istrate, Bogdan
Przybył, Anna
Ianus, Gelu
Powiązania:: https://bibliotekanauki.pl/articles/2106578.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Mg-Ca-Mn alloys
FEA analysis
mechanical properties
Opis:: In the past decades, Mg alloys have been studied intensively as potential orthopedic applications. The present research work, the FEA of the obtained contact stresses in the case of the load applied on Mg-0.5Ca-xMn alloys has been investigated. It has been used the NCB Curved Femur Shaft Plate type as a model in order to establish the necessary modeling parameters. The objective of the present work was to highlight the strain values at the contact point on the surface of the Mg-0.5Ca-xMn alloys. The results showed that the highest stresses observed near the gaps of the plate and in the screws. It means that all mechanical loads are sustained by the plate and screws, and the patient’s femur can be recovered.
Źródło:: Archives of Metallurgy and Materials; 2022, 67, 2; 405--408
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 38.

Tytuł:: Effects of pressure on the kinetics of manganese evaporation from the OT4 alloy
Wpływ ciśnienia nakKinetykę procesu odparowania manganu ze stopu OT4
Autorzy:: Blacha, L.
Burdzik, R.
Smalcerz, A.
Matuła, T.
Powiązania:: https://bibliotekanauki.pl/articles/350826.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: stopy Ti-Al-Mn
odparowanie
współczynnik przenikania masy
vacuum induction melting
Ti-Al-Mn alloy
evaporation
mass transfer coefficient
Opis:: In the paper, results of the study on manganese evaporation from the OT4 alloy are presented. In the experiments, the effects of pressure on the manganese evaporation kinetics and the stages that limit the evaporation rate were investigated. It was demonstrated that the rate of manganese evaporation from the alloy increased with pressure reduction in the system. When the pressure decreases from 1000 Pa to 10 Pa, the value of overall mass transfer kMn increases from 3.9*10-6 ms-1 to 208.4*10-6 ms-1. At the same time, the manganese fraction in the alloy decreased from 1.49% mass to 0.045% mass. Within the whole pressure range, the analysed evaporation process is diffusion-controlled. For pressures above 50 Pa, the determining stage is transfer in the gaseous phase, while for pressures below 50 Pa, it is transfer in the liquid phase.
W prezentowanym opracowaniu przedstawiono wyniki badań odparowania manganu ze stopu OT4. W ramach prowadzonych eksperymentów badano wpływ ciśnienia na kinetykę procesu odparowania manganu i jednocześnie określono etapy limitujące jego szybkość. Wykazano, że szybkość procesu odparowania manganu ze stopu rośnie wraz z obniżaniem ciśnienia w układzie. Przy obniżeniu ciśnienia od 1000 Pa do 10 Pa wartość ogólnego współczynnika transportu masy kMn rośnie od 3.9x10-6 ms-1 do 208.4x10-6 ms-1. Jednocześnie następowało obniżenie zawartości manganu w stopie od 1.49% mas. Do 0.045% mas.. W całym zakresie ciśnień analizowany proces parowania ma kontrolę dyfuzyjną. Dla ciśnień powyżej 50 Pa etapem determinujacym jest transport w fazie gazowej, a dla ciśnien poniżej 50 Pa transport masy w fazie ciekłej.
Źródło:: Archives of Metallurgy and Materials; 2013, 58, 1; 197-201
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 39.

Tytuł:: Evaluation of manganese seed dressings effect on healthiness of spring barley
Ocena działania manganowej zaprawy nasiennej na zdrowotność jęczmienia jarego
Autorzy:: Gleń, K.
Boligłowa, E.
Znój, K.
Powiązania:: https://bibliotekanauki.pl/articles/126724.pdf
Data publikacji:: 2013
Wydawca:: Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:: barley
fungal diseases
Teprosyn Mn
jęczmień
choroby grzybowe
Opis:: The effect of seed dressings: Teprosyn Mn and Raxil Gel 206 on intensification of fungal diseases of culm base, leaves and ears occurrence during the vegetation period of spring barley, Poldek c.v., were assessed in the paper. The applied seed dressings had a notable influence on the intensification of such barley diseases occurrence as: leaf spot caused by B. sorokiniana and Fusarium spp., barley stripe (Pyrenophora graminea), fusarium foot rot (Fusarium spp.) and ear spots (B. sorokiniana). Raxil Gel 206 and Teprosyn Mn preparations revealed a considerable and approximate efficiency in barley protection against fusarium foot rot and leaf spot. On the plots where grain was treated with these preparations pre-sowing, the share of plants showing symptoms of fusarium foot rot was smaller by half than on the control plots, and also the value of index of leaf infection by B. sorokiniana and Fusarium spp. decreased significantly. In comparison with Raxil Gel 206 dressing, manganese Teprosyn Mn dressing showed a significantly higher effectiveness in reducing barley stripe occurrence. It has been evident as a 23.36% lower share of plants infected by Pyrenophora graminea and 14.37% lower value of infection index.
W pracy oceniono wpływ zapraw nasiennych: Teprosyn Mn i Raxil Gel 206 na występowanie chorób grzybowych podstawy źdźbła, liści i kłosów jęczmienia jarego odmiany Poldek. Testowane preparaty istotnie modyfikowały nasilenie plamistości liści (kompleks grzybów B. sorokiniana i Fusarium spp.), pasiastość liści jęczmienia (P. graminea), fuzaryjną zgorzel podstawy źdźbła (Fusarium spp.) oraz plamistość kłosów (B. sorokiniana). Preparaty Raxil Gel 206 i Teprosyn Mn wykazały dużą skuteczność w ochronie jęczmienia przed fuzaryjną zgorzelą podstawy źdźbła i plamistością liści. Udział roślin z objawami fuzaryjnej zgorzeli był o połowę mniejszy niż w obiekcie kontrolnym, istotnie obniżyła się również wartość indeksu porażenia liści przez B. sorokiniana i Fusarium spp. Zaprawa Teprosyn Mn wykazała istotnie większą skuteczność w ograniczeniu występowania pasiastości liści jęczmienia. Wyrazem tego jest o 23,4% mniejszy udział roślin porażonych przez P. graminea oraz o 14,4 niższa wartość indeksu porażenia.
Źródło:: Proceedings of ECOpole; 2013, 7, 1; 59-65
1898-617X
2084-4557
Pojawia się w:: Proceedings of ECOpole
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 40.

Tytuł:: Iron, Zinc, Copper, Manganese and Chromium in Green Teas, Their Transfer to Extracts and Correlations between Contents of Elements and Bioactive Compounds
Autorzy:: Herman, Małgorzata
Janiak, Michał A.
Sadlik, Józefa K.
Piekoszewski, Wojciech
Amarowicz, Ryszard
Powiązania:: https://bibliotekanauki.pl/articles/2152159.pdf
Data publikacji:: 2022-11-22
Wydawca:: Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:: green tea
extracts
Cu
Fe
Zn
Mn
Cr
Opis:: Green tea is used worldwide in the preparation of beverages, but also its extracts rich in bioactive compounds, especially flavan-3-ols, are of increasing interest. In addition to bioactive molecules, green tea represents a source of dietary elements. However, knowledge about their content in extracts is limited. The aim of our research was to determine the extent of transfer of selected elements, i.e., iron (Fe), zinc (Zn), copper (Cu), manganese (Mn), and chromium (Cr), from green teas to their extracts and to investigate whether the main bioactive compounds of the extracts affect this transfer. Twelve commercially available green teas were used in the study. The contents of elements in green teas and their extracts obtained with 80% acetone (v/v) were analysed by inductively coupled plasma optical emission spectroscopy (ICP-OES). High performance liquid chromatography in reverse phase (RP-HPLC) was used to determine contents of caffeine, (–)-epigallocatechin (EGC), (–)-epicatechin (EP), (–)-epigallocatechin gallate (EGCG), and (–)-epicatechin gallate (ECG). The element with the highest content in green teas was Mn (711–1402 µg/g), but its transfer to extracts was the lowest (0.269–0.646%). The mean Fe transfer, second abundant element in teas (115–725 µg/g), was 5.52%. The contents of Mn and Fe in extracts were 5.08–30.2 and 10.7–90.1 µg/g, respectively. Zn, Cu, and Cr were transferred with means of 10.4, 20.0, and 26.2%, respectively, which resulted in their contents in the extracts in the ranges of 5.03–12.6, 1.93–13.8, and 0.128–2.03 µg/g, respectively. The significant positive correlations of Zn content in extracts and/or transfer to extracts with EGCG, EGC and total flavan-3-ols as well as between the same Fe variables and EGC were determined, which suggested that these flavan-3-ols may positively affect the transfer of Fe and Zn from green tea to extracts. In turn, significant but negative correlations were found in the case of Mn and Cu. Future research is needed to identify the causes of the various transfer rate of elements from green teas to extracts.
Źródło:: Polish Journal of Food and Nutrition Sciences; 2022, 72, 4; 421-429
1230-0322
2083-6007
Pojawia się w:: Polish Journal of Food and Nutrition Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 41.

Tytuł:: Effect of chemical composition on number of eutectic colonies in Ni-Mn-Cu cast iron
Autorzy:: Janus, A.
Powiązania:: https://bibliotekanauki.pl/articles/383322.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: eutectic graphite colonies
solidification
austenitic cast iron
cast iron Ni-Mn-Cu
eutektyka grafitowa
krzepnięcie
żeliwo austenityczne
żeliwo Ni-Mn-Cu
Opis:: Determined were direction and intensity of influence of alloying additions on the number of eutectic graphite colonies in austenitic cast iron Ni-Mn-Cu. Chemical composition of the cast iron was 1.7 to 3.3% C, 1.4 to 3.1% Si, 2.8 to 9.9% Ni, 0.4 to 7.7% Mn, 0 to 4.6% Cu, 0.14 to 0.16% P and 0.03 to 0.04% S. Analysed were structures of mottled (20 castings) and grey (20 castings) cast iron. Obtained were regression equations determining influence intensity of individual components on the number of graphite colonies per 1 cm2 (LK). It was found that, in spite of high total content of alloying elements in the examined cast iron, the element that mainly decides the LK value is carbon, like in a plain cast iron.
Źródło:: Archives of Foundry Engineering; 2013, 13, 1; 51-56
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 42.

Tytuł:: Influence on the quality of secondary aluminum alloy casts by Mn addition
Autorzy:: Kuchariková, Lenka
Tillová, Eva
Mazur, Magdalena
Herčko, Adrián
Powiązania:: https://bibliotekanauki.pl/articles/104160.pdf
Data publikacji:: 2019
Wydawca:: Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:: intermetallic phases
addition of Mn
secondary aluminium alloys
quality of cast
wtórne stopy aluminium
fazy międzymetaliczne
dodatek Mn
jakość odlewów
Opis:: The quality of aluminum casts is necessary in order to reach sufficient properties required for application. The decreasing in the properties of aluminum cast mainly related with microstructure, especially with size and morphology of second phases. One of such second phases in aluminum alloys are the β-phases. These phases are unwonted mainly because of the decreasing of mechanical properties. The contribution is deal with influence of addition of Mn to affecting the formation of βphases in the AlSi7Mg0.3 and AlSi7Mg0.6 cast alloys. These materials are used for application especially automotive industry. The results shows, that addition of Mn is not sufficient for affecting of formation of the Fe-rich phases in AlSi7Mg0.6 cat alloys, but in the AlSi7Mg0.3 this addition lead to changes in formation of Fe-rich intermetallic phases.
Źródło:: Quality Production Improvement - QPI; 2019, 1, 1; 319-325
2657-8603
Pojawia się w:: Quality Production Improvement - QPI
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 43.

Tytuł:: Non-Modulated Martensite Microstructure With Internal Nanotwins In Ni-Mn-Ga Alloys
Nie-modulowana martenzytyczna mikrostruktura z wewnętrznymi nano-bliźniakami w stopach Ni-Mn-Ga
Autorzy:: Szczerba, M. J.
Powiązania:: https://bibliotekanauki.pl/articles/356913.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: shape memory alloys
martensite
Ni-Mn-Ga single crystals
interface
stopy z pamięcią kształtu
martenzyt
monokryształy Ni-Mn-Ga
interfejs
Opis:: The self-accommodated non-modulated martensite of Ni-Mn-Ga single crystal was studied by transmission and scanning electron microscopy in the latter case using the electron backscatter diffraction technique. Three kinds of interfaces existing at different length scales were reported. The first, is the wavy and incoherent interface separating martensite variants observed on the micro-level with no-common crystallographic plane between them. The second is within a single martensite plate where the lattice rotates around one of the {110} pole to accommodate the interfacial curvature between martensite plates. Finally, at the nanoscale the third interface exists, a twin boundary separating internal nanotwins with the {112} type habit plane.
W pracy przeprowadzono obserwacje mikrostruktury monokryształu Ni-Mn-Ga charakteryzujący się nie-modulowaną strukturą martenzytyczną. Badania przeprowadzono z wykorzystaniem techniki transmisyjnej oraz skaningowej mikroskopii elektronowej. W przypadku drugiej metody zastosowano technikę elektronów wstecznie rozproszonych. Trzy rodzaje granic zostały zaobserwowane oraz opisane. Pierwsza granica jest niekoherentna i występuje w skali mikro pomiędzy płytkami martenzytu, które nie posiadają wspólnej płaszczyzny krystalograficznej o niskich indeksach Millera. Kolejna granica występuje wewnątrz pojedynczej płytki martenzytycznej, której towarzyszy rotacja sieci krystalicznej wokół kierunku {110} obszarów przedzielonych tą granicą w celu akomodacji wygięć granicy występującej między płytkami. W skali nanometrycznej można zaobserwować kolejną granicę równoległą do płaszczyzny krystalograficznej {112} (płaszczyzna bliźniacza), która rozdziela płytki nanobliźniaków.
Źródło:: Archives of Metallurgy and Materials; 2015, 60, 3; 2267-2270
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 44.

Tytuł:: Tunneling in Semiconductor Nanostructures: Physics and Devices
Autorzy:: Lüth, H.
Powiązania:: https://bibliotekanauki.pl/articles/1946763.pdf
Data publikacji:: 1996-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.80.Ey
73.40.Gk
85.30.Mn
Opis:: Since modern semiconductor epitaxy techniques have reached the present level of perfectness, resonant tunneling through double barrier structures has attracted new interest, also with respect to novel device applications. The present review shortly discusses the underlying physical concepts of resonant tunneling through semiconductor multiple heterostructures. Beside resonant tunneling diodes also concepts for tunneling transistors are discussed. In particular, a novel 2D-2D tunnel transistor is presented, in which tunneling between two neighboring two-dimensional electron gases yields current-voltage characteristics with two types of instabilities depending on the applied gate voltage. Scaling down the lateral dimensions of a resonant tunneling diode leads to quantum boxes or dots, in which the effect of single electron tunneling with Coulomb-blockade can be observed. The underlying physics is discussed on the basis of recent experiments and theoretical calculations. Finally some possible future applications both of resonant tunneling diodes and of single electron devices are presented.
Źródło:: Acta Physica Polonica A; 1996, 90, 4; 667-679
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 45.

Tytuł:: Effect of Interface Roughness on Resonant Tunnelling in Double-Barrier Heterostructures
Autorzy:: Figielski, T.
Wosiński, T.
Mąkosa, A.
Powiązania:: https://bibliotekanauki.pl/articles/1950747.pdf
Data publikacji:: 1996-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.Gk
85.30.Mn
68.35.Ct
Opis:: We argue that the well-boundary roughness in a double-barrier heterostructure induces subsidiary subbands in the quantum well which, in turn, lead to the appearance of a broad shoulder beyond the principal resonance peak in the current-voltage characteristics.
Źródło:: Acta Physica Polonica A; 1996, 90, 4; 777-780
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 46.

Tytuł:: Spin Polarons in Two-Dimensional Systems
Autorzy:: Morkowski, J. A.
Powiązania:: https://bibliotekanauki.pl/articles/2011229.pdf
Data publikacji:: 2000-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.27.+a
72.10.Di
74.20.Mn
Opis:: The problem of motion of holes on a square lattice of antiferromagnetically ordered spins is considered. An overview of the theory of hole dynamics in the antiferromagnetic background is presented. Motion of a single hole is rather well understood both by numerical and analytical methods. For small but finite concentration of holes a treatment analogous to the standard polaron theory is discussed starting with an exact mapping of the t-J Hamiltonian into holon and pseudospin variables.
Źródło:: Acta Physica Polonica A; 2000, 97, 1; 101-110
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 47.

Tytuł:: Destruction of Antiferromagnetic Order by Localized Polarons
Autorzy:: Wilamowski, Z.
Hankiewicz, E. M.
Powiązania:: https://bibliotekanauki.pl/articles/2013011.pdf
Data publikacji:: 2000-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.-z
75.10.-b
74.20.Mn
Opis:: Analysis of a finite spin cluster indicates a possibility of the formation of purely magnetic polarons in low-dimensional antiferromagnets. It is shown that for parameters characteristic of CuO$\text{}_{2}$ based superconductors a strong antiferromagnetic polaron can occur. The destruction of antiferromagnetic order by the presence of a magnetic polaron is discussed.
Źródło:: Acta Physica Polonica A; 2000, 97, 3; 403-406
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 48.

Tytuł:: Superconductivity and Charge-Density Wave Phase in the Holstein Model: a Weak Coupling Limit
Autorzy:: Grzybowski, P.
Micnas, R.
Powiązania:: https://bibliotekanauki.pl/articles/2047304.pdf
Data publikacji:: 2007-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.38.-k
71.45.Lr
74.20.Mn
Opis:: The variational canonical transformation method has been applied to the Holstein model to obtain an effective polaronic Hamiltonian, which is subsequently analyzed in the limit of a weak effective electron-electron interaction. A competition between the superconducting and charge-density wave phases has been studied in the light of strong polaronic effects. The phase diagrams illustrating the system evolution from adiabatic to anti-adiabatic limit are presented.
Źródło:: Acta Physica Polonica A; 2007, 111, 4; 453-463
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 49.

Tytuł:: Electromagnetic Response in Kinetic Energy Driven Superconductivity: the Meissner Effect
Autorzy:: Krzyzosiak, M.
Lan, Y.
Feng, S.
Jacak, L.
Gonczarek, R.
Powiązania:: https://bibliotekanauki.pl/articles/1536649.pdf
Data publikacji:: 2010-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.25.Ha
74.25.N-
74.20.Mn
Opis:: Electromagnetic response of cuprate superconductors is studied within the model of kinetic energy driven d-wave superconductivity by analyzing the Meissner effect. The kernel of the linear response function is found and employed to calculate the magnetic field penetration depth and the superfluid density of cuprate superconductors within the specular reflection model for a purely transverse vector potential. It is shown that the magnetic field penetration depth and the superfluid density depend linearly on temperature, except for a strong deviation from the linear characteristics at extremely low temperatures, which is attributed to nonlocal effects. The zero-temperature superfluid density is found to decrease linearly with decreasing doping concentration in the underdoped regime. The problem of gauge invariance in the theoretical description of the electromagnetic response is addressed, and an approximation which does not violate local charge conservation is proposed.
Źródło:: Acta Physica Polonica A; 2010, 118, 2; 283-288
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:: The Quantum Signature of Chaos through the Dynamics of Entanglement in Classically Regular and Chaotic Systems
Autorzy:: Chew, L.
Chung, N.
Powiązania:: https://bibliotekanauki.pl/articles/1492762.pdf
Data publikacji:: 2011-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.45.Mt
03.67.Bg
03.67.Mn
Opis:: We demonstrate the dependence of the entanglement dynamics on the global classical regime of regular, mixed and chaotic dynamics with initial squeezed coherent states. By squeezing the initial states, we are able to enhance or suppress the entanglement entropy of the dynamically generated quantum states relative to those produced via initial coherent states. This suggests the possibility of exploiting a judicious selection of initial squeezed states to create quantum states with enhanced entanglement entropy dynamically for the purpose of robust quantum information processing.
Źródło:: Acta Physica Polonica A; 2011, 120, 6A; A-095-A-099
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 51.

Tytuł:: Tunable Entanglement Sudden Death and Birth in Cavity QED with Nonlinear Kerr-Like Medium
Autorzy:: He, Q.
Xu, J.
Powiązania:: https://bibliotekanauki.pl/articles/1493398.pdf
Data publikacji:: 2011-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 03.65.Ud
03.67.-a
03.67.Mn
Opis:: The influence of nonlinear Kerr-like medium on the phenomenon of entanglement sudden death and birth in a double Jaynes-Cummings model is investigated. It is shown that the entanglement sudden death and birth phenomenon may appear in this system and the duration of entanglement sudden death and birth can be controlled by the nonlinear Kerr-like medium. Particularly, the phenomenon of entanglement sudden death and birth disappears one after another if we increase the value of the Kerr coefficient χ continuously, and all disappears if the value of the Kerr coefficient χ is large enough.
Źródło:: Acta Physica Polonica A; 2011, 120, 3; 390-396
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 52.

Tytuł:: Study of the Electrical Behavior of Metal/α-SiC:H/poly-Si(N) Structure Using Simulation
Autorzy:: Papadopoulou, P.
Stavrinides, S.
Hanias, M.
Magafas, L.
Powiązania:: https://bibliotekanauki.pl/articles/1401377.pdf
Data publikacji:: 2015-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 85.30.De
85.30.Mn
85.30.Hi
Opis:: In this report, a study of the electrical behavior for the Metal/a-SiC/poly-Si(n) structure, appears. Different thicknesses of a-SiC:H thin films are considered; in specific the a-SiC:H layer thickness is varied between 100 Å up to 800 Å. The 2-D ATLAS advanced numerical simulator has been utilized in order to simulate the material's electrical behavior and produce the reported hereby results. The study of the I-V (current-voltage) characteristics of these Metal/α-SiC:H/poly-Si(N) structures, reveals a very interesting hysteretic behavior that is a function of the a-SiC:H thin-film thickness. Such materials have lately raised the engineering community's interest because of their possible utilization as memristive elements.
Źródło:: Acta Physica Polonica A; 2015, 127, 4; 1349-1351
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 53.

Tytuł:: INDRA: A 4π Detector for Nuclear Dynamics and Thermodynamics Studies
Autorzy:: Rivet, M.
Powiązania:: https://bibliotekanauki.pl/articles/1402640.pdf
Data publikacji:: 2015-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 25.70.Mn
25.70.Pq
24.60.Ky
Opis:: This paper reports on some topics presently studied by the INDRA collaboration in nuclear dynamics and thermodynamics. We shall show information on the density dependence of the symmetry term of the nuclear equation of state. A possible origin of multifragmentation and fragment formation will be demonstrated. Finally we report on an experiment aiming at determining the influence of isospin on the nucleus level density.
Źródło:: Acta Physica Polonica A; 2015, 127, 5; 1552-1554
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 54.

Tytuł:: Influence of Electronic Structure on the Phase Diagram of Weakly Doped Superconducting Cuprates
Autorzy:: Maciąg, A. M.
Wróbel, P.
Powiązania:: https://bibliotekanauki.pl/articles/2047334.pdf
Data publikacji:: 2007-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.10.Fd
74.20.Mn
74.25.Dw
Opis:: Motivated by the difference between the experimental phase diagram of cuprates and expectations of the t-J model, we analyze the influence of the electronic structure on superconducting state generation for small levels of doping. Following some theoretical studies of the Fermi surface for hole doped superconducting cuprates we base our calculations on the t-t'-t''-J model. We construct the spin polaron model, which is an effective model for the t-J model, and we expand it by adding the new terms related to the next neighbor hopping integrals t' and t''. In the framework of this model we study evolutions of superconducting correlation functions with doping. As a result of numerical calculations we find out that superconducting state vanishes for small levels of doping and finite values of t' and t''. This is in qualitative agreement with experimental results.
Źródło:: Acta Physica Polonica A; 2007, 111, 5; 721-725
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 55.

Tytuł:: Asymmetric Tunneling Conductance in Doped Antiferromagnets
Autorzy:: Maciąg, A.
Wróbel, P.
Powiązania:: https://bibliotekanauki.pl/articles/2046776.pdf
Data publikacji:: 2006-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.10.Fd
74.20.Mn
74.25.Fy
Opis:: We calculate the tunneling conductance in the framework of the spin polaron model, which is an effective model for the t-J model, in the limit where at least short-range antiferromagnetic correlations exist. We show that both in the normal state and in the superconducting state the asymmetry of tunneling conductance is present. This fact is the implication of the particle-hole asymmetry of the spin polaron Hamiltonian in the limit of low density of spin polarons which are quasiparticles emerging in a hole doped antiferromagnet. Experimental evidence of analogous asymmetric tunneling conductance was found in the tunneling spectroscopy measurements of high T$\text{}_{c}$ superconductors.
Źródło:: Acta Physica Polonica A; 2006, 109, 4-5; 607-610
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 56.

Tytuł:: Technical B-H Saturation Magnetization Curve Models for SPICE, FEM and MoM Simulations
Autorzy:: Szewczyk, R.
Powiązania:: https://bibliotekanauki.pl/articles/384253.pdf
Data publikacji:: 2016
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: saturation
magnetization curve
perpendicular anisotropy
Mn-Zn ferrite
Finemet
Opis:: Recent development of SPICE, FEM and MoM software often requires the fast and reliable description of BH saturation magnetization curve. In spite of the fact that physical models of BH saturation curve are very sophisticated, for technical purposes, such curve may be modelled by simplified equations. Paper presents the quantitative assessment of the quality of four technical models of BH saturation magnetization curve performed for four modern magnetic materials: constructional corrosion resistant steel, Mn-Zn ferrite, amorphous alloy with perpendicular anisotropy as well as Finemet-type nanocrystalline magnetic material. Presented results confirm reliability of the model as well as indicate that high-speed calculation may be done using arctangent function.
Źródło:: Journal of Automation Mobile Robotics and Intelligent Systems; 2016, 10, 2; 3-7
1897-8649
2080-2145
Pojawia się w:: Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 57.

Tytuł:: Entanglement Detection by Current Measurements in Double Quantum Dot System
Autorzy:: Busz, P.
Rożek, P.
Tomaszewski, D.
Martinek, J.
Powiązania:: https://bibliotekanauki.pl/articles/1386781.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 03.67.Mn
03.67.Bg
73.23.-b
Opis:: The development of quantum computing in quantum dots systems requires highly efficient and continuous solid-state source of spatially separated spin-entangled electrons. One of the approaches is a use of double quantum dot system connected to superconducting lead, where Cooper pairs provide a source of naturally entangled electrons. Apart from the source, an useful tool for detection of quantum entanglement is needed. We present entanglement detection by the ferromagnetic electrodes using entanglement witness operator method and direct measurement of spin polarized current in the system. We investigate requirements that have to be fulfilled by ferromagnetic detectors.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 490-492
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 58.

Tytuł:: Entanglement Detection with Non-Ideal Ferromagnetic Detectors
Autorzy:: Rożek, P.
Busz, P.
Kłobus, W.
Tomaszewski, D.
Grudka, A.
Baumgartner, A.
Schönenberger, C.
Martinek, J.
Powiązania:: https://bibliotekanauki.pl/articles/1386794.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 03.67.Mn
03.67.Bg
73.23.-b
Opis:: Entangled states are essential in basics quantum communication protocols and quantum cryptography. Ferromagnetic contacts can work as a spin detector, giving possibility of converting information about electron spin to the electric charge, and therefore, detection of entangled states with the electric current measurements is possible. Method of confirming entanglement with non-ideal detectors is presented, the impact of decoherence and noise on states and quality of entanglement is discussed. Entanglement witness (EW) operator method is compared with the CHSH inequalities approach. Required spin polarization for the EW is lower than for the CHSH inequalities. System with asymmetric spin polarizations of detectors was analyzed, including the CHSH inequalities and the EW method.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 493-495
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 59.

Tytuł:: Pairing-Symmetry Selection in a Weakly Doped Canted Antiferromagnet on the Triangular Lattice
Autorzy:: Wróbel, P.
Suleja, W.
Powiązania:: https://bibliotekanauki.pl/articles/1812329.pdf
Data publikacji:: 2008-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.10.Fd
74.20.Mn
75.50.Ee
Opis:: The mechanism of superconductivity generation by spin fluctuations in the electron doped canted antiferromagnet on the triangular lattice was analyzed. The underlying assumption is that the formation of the bound state is the prerequisite of pairing. The outcome of this analysis is also valid if an additional isotropic attraction is active but the anisotropic spin-fluctuation mediated force decides on the symmetry of the two-particle bound state. When the canted antiferromagnetic state is generated, the symmetry of the point group $C_{6v}$ for the triangular lattice is lowered to the symmetry of $C_{3v}$. It is demonstrated that spin fluctuations definitely favor the p-wave bound state, which transforms according to the E representation of $C_{3v}$. Since the inversion is not an element of $C_{3v}$, the parity is not a good quantum number and thus the predicted paired state will be a mixture of singlet and triplet. Such a scenario may be relevant to physics of superconducting triangular cobaltates or organics.
Źródło:: Acta Physica Polonica A; 2008, 114, 1; 225-228
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 60.

Tytuł:: Antibacterial Properties of Polyester Fibres Materials with Titanium Dioxide Deposited on Their Surface
Autorzy:: Karbownik, I.
Kowalczyk, D.
Malinowska, G.
Paruch, B.
Powiązania:: https://bibliotekanauki.pl/articles/1807589.pdf
Data publikacji:: 2009-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.80.Ba
68.47.Mn
81.07.Wx
Opis:: $TiO_{2}$ particles were deposited onto the surface of polyester (PES) material. The microbiological research were carried out on two bacteria strains: Staphylococcus aureus and Klebsiella pneumoniae, which showed antibacterial properties of the PES surfaces modified with the titanium dioxide under the influence of UV radiation.
Źródło:: Acta Physica Polonica A; 2009, 116, S; S-169-S-171
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 61.

Tytuł:: Ground State Phase Diagrams of the Extended Hubbard Model with Repulsive Pair-Hopping Interaction for Nonfrustrated 2D Lattice
Autorzy:: Czart, W.
Robaszkiewicz, S.
Powiązania:: https://bibliotekanauki.pl/articles/1385232.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.-z
71.28.+d
74.20.Mn
Opis:: We analyze the extended Hubbard model with pair-hopping interaction J, i.e. the Penson-Kolb-Hubbard model, in the case of repulsive J (J < 0) within the (broken symmetry) Hartree-Fock approximation. We focus our study on the effects of on-site U interaction on the mutual stability of magnetic, charge-ordered, and superconducting states including the eta-pairing phase, i.e. the state with the Cooper-pair center-of-mass momentum q=Q. The ground state phase diagrams are obtained for arbitrary particle concentration n on nonfrustrated d=2 square lattice.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 275-277
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 62.

Tytuł:: Ground State Phase Properties of the Penson-Kolb-Hubbard Model with Attractive Pair-Hopping Interaction
Autorzy:: Czart, W.
Robaszkiewicz, S.
Powiązania:: https://bibliotekanauki.pl/articles/1385235.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.-z
71.28.+d
74.20.Mn
Opis:: We study the ground state phase diagrams of the extended Hubbard model with the pair-hopping interaction J, i.e. the Penson-Kolb-Hubbard model. We concentrate on the case of attractive J (J > 0) which can stabilise s-wave pairing superconductivity in the system and competes with the on-site repulsive U. The evolution of the phase diagrams and order parameters for arbitrary electron density and representative values of the interaction parameters are analyzed within the (broken symmetry) Hartree-Fock approximation. The calculations are performed for the case of nearest-neighbors electron hopping t on the d=2 square lattice.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 278-280
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 63.

Tytuł:: Influence of Particle Size and Load on Loss of Material in Manganese-Steel Material: an Experimental Investigation
Autorzy:: Sinha, R.
Mukhopadhyay, A. K.
Powiązania:: https://bibliotekanauki.pl/articles/354746.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Mn-steel
abrasive wear
stacking fault energy
FESEM
DOE
Opis:: The present study explores the influence of variables like particle size of coal, load, speed and sliding distance on weight loss in manganese-steel (Mn-steel). The observations are made using pin-on-disc apparatus. Specimen prepared from Mn-steel used for the wear test. The size and shape of specimen is in accordance with ASTM G99 standard. From design of experiment (DOE) procedure the variables load were altered to assess the weight loss in material. It is observed that with the increase in particle size and load, the weight loss increases when other variables are constant. Mn-steel shows decrease in weight loss at higher load due to property of dipole interaction and stacking fault energy (SFE). Decrease in weight loss at higher load results in transition in wear mechanism from scratch to groove formation as observed under field emission scanning electron microscope (FESEM).
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 1; 359-364
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 64.

Tytuł:: Design of new casting alloys of Al-Mg-Si-Mn system with alloying additions, its structure, and mechanical properties
Projektowanie nowych stopów odlewniczych układu Al-Mg-Si-Mn z dodatkami stopowymi wraz z ich strukturą i właściwościami mechanicznymi
Autorzy:: Boyko, V.
Czekaj, E.
Warmuzek, M.
Mykhalenkov, K.
Powiązania:: https://bibliotekanauki.pl/articles/263781.pdf
Data publikacji:: 2017
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: Al-Mg-Si-Mn alloy
casting
Lithium
heat treatment
mechanical properties
stop Al-Mg-Si-Mn
odlewanie
lit
obróbka cieplna
właściwości mechaniczne
Opis:: The strength of Al-Mg-Si-Mn casting alloy strongly depends on Mg content in solid solution and precipitation of strengthening phases. Alloys with the nominal composition AlMg5Si2Mn with addition of Li and Ti+Zr were studied by means of differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and energy dispersive X-Ray analysis (EDX). DSC measurements show that the eutectic melting temperature was about 595°C and it is higher than that of commercial A356 casting alloy. The macro- and microhardness tests show that in as-cast state hardness were higher than for A356 and continuously growth during artificial aging. TEM investigations reveal that during artificial aging three different precipitation types are forms in the alloy matrix. Two of them belong to the different structures of Mg2Si precipitates. Appearance of the third one identified as δ’-Al3Li phase represent that Al-Mg-Si system can be successfully used for designing of Li-containing casting alloy which is not developed yet.
Wytrzymałość stopu Al-Mg-Si-Mn w dużym stopniu zależy od zawartości Mg w roztworze stałym i wydzieleń faz wzmacniających. Stopy o nominalnym składzie AlMg5Si2Mn z dodatkiem Li i Ti + Zr badano za pomocą różnicowej kalorymetrii skaningowej (DSC), transmisyjnej mikroskopii elektronowej (TEM) i dyspersyjnej analizy promieniowania rentgenowskiego (EDX). Pomiary DSC pokazują, że eutektyczna temperatura topnienia wynosiła około 595°C i była wyższa niż w przypadku komercyjnego stopu odlewniczego A356. Testy makro- i mikrotwardości pokazują, że w stanie po odlaniu twardość była wyższa niż w przypadku A356 i stale rosła podczas sztucznego starzenia. Badania TEM wykazały, że podczas sztucznego starzenia w osnowie stopu występują trzy różne rodzaje wydzieleń. Dwa z nich należą do wydzieleń Mg2Si o różnej strukturze. Pojawienie się trzeciej, zidentyfikowanej jako faza δ’-Al3Li, oznacza, że układ Al-Mg-Si może być z powodzeniem stosowany do projektowania stopu odlewniczego zawierającego Li, który jeszcze nie został opracowany.
Źródło:: Metallurgy and Foundry Engineering; 2017, 43, 3; 141-152
1230-2325
2300-8377
Pojawia się w:: Metallurgy and Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 65.

Tytuł:: Effect of alloying elements on solidification of primary austenite in Ni-Mn-Cu cast iron
Autorzy:: Janus, A.
Kurzawa, A.
Powiązania:: https://bibliotekanauki.pl/articles/382123.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: primary austenite
solidification process
austenitic cast iron
Ni-Mn-Cu cast iron
austenit pierwotny
proces krzepnięcia
żeliwo austenityczne
żeliwo Ni-Mn-Cu
Opis:: Within the research, determined were direction and intensity of alloying elements influence on solidification way (directional or volumetric) of primary austenite dendrites in hypoeutectic austenitic cast iron Ni-Mn-Cu. 50 cast shafts dia. 20 mm were analysed. Chemical composition of the alloy was as follows: 1.7 to 3.3 % C, 1.4 to 3.1 % Si, 2.8 to 9.9 % Ni, 0.4 to 7.7 % Mn, 0 to 4.6 % Cu, 0.14 to 0.16 % P and 0.03 to 0.04 % S. The discriminant analysis revealed that carbon influences solidification of primary austenite dendrites most intensively. It clearly increases the tendency to volumetric solidification. Influence of the other elements is much weaker. This means that the solidification way of primary austenite dendrites in hypoeutectic austenitic cast iron Ni-Mn-Cu does not differ from that in an unalloyed cast iron.
Źródło:: Archives of Foundry Engineering; 2011, 11, 2 spec.; 93-96
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 66.

Tytuł:: Positronium time-of-flight Measurements of Mesoporous Silica Films
Autorzy:: Kuang, Peng
Zhang, Xiao
He, Chun
Cao, Xing
Wang, Bao
Powiązania:: https://bibliotekanauki.pl/articles/1029796.pdf
Data publikacji:: 2018-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.70.Bj
61.05.-a
68.47.Mn
Opis:: Mesoporous silica films were synthesized with various concentrations of cetyltrimethylammonium bromide (CTAB) in precursor sols through the method of electro-assisted self-assembly (EASA). Oriented pore channels were observed in the films prepared with more CTAB in the precursor sols. Positronium time-of-flight (Ps-TOF) measurements were performed for the silica films with different porous structures. It is demonstrated that the Ps emission intensity and energies are well correlated to the apparent porosity, pore interconnectivity and possibly pore channel orientation. The results indicate that Ps-TOF can be a useful technique for probing the structures of porous films.
Źródło:: Acta Physica Polonica A; 2018, 133, 1; 3-6
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 67.

Tytuł:: Mn₂O₃ Nanoparticles Synthesized from Thermal Decomposition of Manganese(II) Schiff Base Complexes
Autorzy:: Khalaji, A.
Ghorbani, M.
Powiązania:: https://bibliotekanauki.pl/articles/1029800.pdf
Data publikacji:: 2018-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: Mn₂O₃ nanoparticles
manganese(II)
Schiff base
thermal decomposition
Opis:: The Mn₂O₃ nanoparticles have been prepared using solid state thermal decomposition of MnL¹ and MnL², L¹=N,N'-bis(2-hydroxy-4-methoxybenzophenone)-1,3-propanediamine and L²=N,N'-bis(2-hydroxy-4-methoxybenzophenone)-1,2-cyclohexanediamine, at 500°C for 3 h and characterized by the Fourier transform infrared spectroscopy, X-ray powder diffraction and scanning electron microscopy. The Fourier transform infrared spectroscopy and X-ray powder diffraction confirm that the formed product at 500°C is Mn₂O₃. The MnL¹ and MnL² complexes were prepared from the one-pot reaction of MnCl₂·H₂O, diamine and 2-hydroxy-4-methoxybenzophenone and characterized by elemental analyses, the Fourier transform infrared spectroscopy and thermogravimetry.
Źródło:: Acta Physica Polonica A; 2018, 133, 1; 7-9
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 68.

Tytuł:: A Study of the Properties of Paper Sized with Styrene-Butyl Acrylate Copolymers
Autorzy:: Özdemir, M.
Özdemir Alp, M.
Aytaç, A.
Deniz, V.
Powiązania:: https://bibliotekanauki.pl/articles/1031427.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 68.35.bm
68.47.Mn
81.05.Qk
Opis:: In this study, styrene 70 wt.%-butyl acrylate 30 wt.% copolymer-based surface-sizing materials were synthesized using semi-batch emulsion polymerization and applied on the paper. Four different emulsifiers, with different ethylene oxide numbers, at ratios of 10%, 7% and (2, 2'-azobis (2-methylpropionamidine) dihydrochloride (A)) as initiator were used for emulsion polymerization. Eight different copolymers were synthesized. Synthesized copolymers were used as surface sizing agents for the paper surface. Ion exchange capacity, pH, Fourier transform infrared spectroscopy, differential scanning calorimetry and thermal gravimetric analysis were used for the characterization of the copolymer properties. Contact angle measurements, Cobb test, and scanning electron microscopy analysis were carried out to determine the surface properties of the paper samples. Presence of copolymer formations was proven with the Fourier transform infrared analysis. Contact angle measurements of the copolymer sized paper surface have shown hydrophobic behaviour in samples, with the exception of E-3/7/A sample. The lowest Cobb value was observed for E-2/7/A sample. The highest thermal stability was also observed for E-2/7/A sample. The scanning electron micrographs show that the paper loses its fibrous structure and it is seen that the copolymer adheres to the fibrous tissue.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 1098-1101
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 69.

Tytuł:: Phase-Space Approach to the Position-Momentum Correlations of the Conduction Electron States in a Double-Barrier Resonant Nanosystem
Autorzy:: Kaczor, U.
Wołoszyn, M.
Spisak, B.
Powiązania:: https://bibliotekanauki.pl/articles/1032445.pdf
Data publikacji:: 2017-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.60.Gg
85.30.De
85.30.Mn
Opis:: The phase-space formulation of quantum mechanics based on the Wigner distribution function is applied to investigate the influence of the scattering processes on the electronic position-momentum correlations in the resonant-tunnelling nanosystem.
Źródło:: Acta Physica Polonica A; 2017, 132, 1; 106-108
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 70.

Tytuł:: Electron Behaviour of $(Nd_{0.33}Eu_{0.2}Gd_{0.47})Ba_2Cu_3O_{y}$ Studied by Infrared Measurements
Autorzy:: Rameš, M.
Železný, V.
Phuoc, V.
Gervais, F.
Wolf, T.
Jirsa, M.
Powiązania:: https://bibliotekanauki.pl/articles/1534787.pdf
Data publikacji:: 2010-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.25.Gz
74.20.Mn
74.25.Kc
Opis:: Optical properties of a are $(Nd_{0.33}Eu_{0.2}Gd_{0.47})Ba_2$ $Cu_3O_y$ (NEG-123) single crystal interpreted in terms of the extended Drude model.
Źródło:: Acta Physica Polonica A; 2010, 118, 5; 938-939
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 71.

Tytuł:: On Realization of the Bose-Einstein Condensates and Quantum Superfluids
Autorzy:: Domański, T.
Powiązania:: https://bibliotekanauki.pl/articles/1536541.pdf
Data publikacji:: 2010-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.-z
74.20.Mn
74.40.-n
Opis:: The purpose of this work is twofold. In the first part we describe superfluidity/superconductivity as an emergent phenomenon resulting from two-body correlations in presence of the Bose-Einstein condensation of particles. We briefly discuss the underlying mechanism for bosons as well as fermion pairs and illustrate various realizations of superfluidity emphasizing the recent examples. In the second part we study the glassy liquid of incoherent pairs which might exist above the transition temperature $T_{c}$ in the underdoped regime of cuprate superconductors. In particular, we explore the angular variation of pseudogap within two-dimensional version of the boson-fermion model using for a quantitative analysis the projective method. We find that above $T_{c}$ the pseudogap closes first near the nodal areas restoring there pieces (arcs) of the Fermi surface whereas remaining parts of the large Fermi surface around the antinodal points are still absent due to incoherent pairs. Upon increasing temperature the length of the Fermi arcs enlarges because the superconducting correlations are gradually suppressed. An intriguing death of Fermi surface can thus be closely related to the Bogoliubov quasiparticles whose existence in the pseudogap state has been predicted by us and confirmed recently by the angle resolved photoemission spectroscopy measurements on $Bi_2Sr_2CaCu_2O_8$ and $La_{1.895}Sr_{0.105}CuO_4$ compounds.
Źródło:: Acta Physica Polonica A; 2010, 118, 2; 204-211
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 72.

Tytuł:: Phase Diagrams of the Penson-Kolb-Hubbard Model with Repulsive Pair-Hopping Interaction
Autorzy:: Czart, W.
Robaszkiewicz, S.
Powiązania:: https://bibliotekanauki.pl/articles/1398641.pdf
Data publikacji:: 2016-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.-z
71.28.+d
74.20.Mn
Opis:: We study the extended Hubbard model with on-site density-density U and intersite pair hopping J interactions, i.e. the Penson-Kolb-Hubbard model. This report focuses mainly on the properties of the model at T ≥q 0 in the case of repulsive J (J < 0) which may stabilize superconductivity with η-pairing. The analysis is performed within the (broken symmetry) Hartree-Fock approximation for arbitrary interaction parameters (J < 0 and U) and electron concentration (0 < n < 2) on the d = 2 square lattice. The phase diagrams of the model at T=0 and at finite temperatures are examined taking into account magnetic and charge-ordered phases and superconducting states with η- and s-wave pairing.
Źródło:: Acta Physica Polonica A; 2016, 130, 2; 613-616
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 73.

Tytuł:: Improvement of the Toughness and Crack Propagation Resistance Properties of Poly(Phenylene Sulfide)
Autorzy:: Cetin, B.
Sahin, A.
Karsli, N.
Yilmaz, T.
Sinmazcelik, T.
Curgul, I.
Powiązania:: https://bibliotekanauki.pl/articles/1398748.pdf
Data publikacji:: 2016-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.05.Qk
62.25.Mn
62.20.mm
Opis:: Poly(phenylene sulfide) (PPS) is a high-performance thermoplastic engineering polymer, which exhibits outstanding properties such as electrical insulation, dimensional and thermal stability, chemical resistance, etc. In addition to this, PPS has a high degree of crystallinity and it exhibits good physical properties at elevated temperatures. Owing to these properties, PPS is widely used in electrical and electronic components, automobile industry and mechanical applications. These outstanding properties of PPS can be attributed to its chemical structure, composed of phenyl groups linked by a sulfur atom, which gives rigidity to the chain. On the other hand, the brittleness with low elongation strain, toughness and crack propagation resistance also restricts its further applications. Several methods are used to overcome these undesirable properties of PPS. Blending of PPS with other polymers is one of these methods. In this study, Ethylene-Acrylic Ester-Glycidyl Methacrylate terpolymer (Lotader®-AX8900) was used to improve the toughness and crack propagation resistance properties of PPS. For this purpose, PPS/Lotader (0, 2, 5, 10 wt.% Lotader) blends were prepared at various compositions. The blends were manufactured using laboratory scale twin screw extruder and injection molding machine. Mechanical properties of blends were investigated by using tensile test method. In addition to this, crack propagation and toughness of samples were investigated by using essential work of fracture (EWF) method. As a result of this study, it was found that Lotader addition significantly increases the toughness and crack propagation resistance of PPS.
Źródło:: Acta Physica Polonica A; 2016, 129, 4; 683-686
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 74.

Tytuł:: Coherence Lengths for Superconductivity in the Two-Orbital Negative-U Hubbard Model
Autorzy:: Litak, G.
Örd, T.
Rägo, K.
Vargunin, A.
Powiązania:: https://bibliotekanauki.pl/articles/1431204.pdf
Data publikacji:: 2012-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.-z
74.20.Mn
74.25.-q
Opis:: We study the peculiarities of coherency in the superconductivity of two-orbital system. The superconducting phase transition is caused here by the on-site intra-orbital attractions (negative-U Hubbard model) and inter-orbital pair-transfer interaction. The dependencies of critical and non-critical correlation lengths on interaction channels and band fillings are analyzed.
Źródło:: Acta Physica Polonica A; 2012, 121, 4; 747-751
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 75.

Tytuł:: Dynamical Local Lattice Instability Triggered High $T_c$ Superconductivity
Autorzy:: Ranninger, J.
Powiązania:: https://bibliotekanauki.pl/articles/1384081.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.72.-h
74.20.Mn
71.38.Mx
Opis:: High $T_c$ cuprate superconductors are characterized by two robust features: their strong electronic correlations and their intrinsic dynamical local lattice instabilities. Focusing on exclusively that latter, we picture their parent state in form of a quantum vacuum representing an electronic magma in which bound diamagnetic spin-singlet pairs pop in and out of existence in a Fermi sea of itinerant electrons. The mechanism behind that resides in the structural incompatibility of two stereo-chemical configurations $Cu^{II}O₄$ and $Cu^{III}O₄$ which compose the CuO₂ planes. It leads to spontaneously fluctuating Cu-O-Cu valence bonds which establish a local Feshbach resonance exchange coupling between bound and unbound electron pairs. The coupling, being the only free parameter in this scenario, the hole doping of the parent state is monitored by varying the total number of unpaired and paired electrons, in chemical equilibrium with each other. Upon lowering the temperature to below a certain T*, bound and unbound electron pairs lock together in a local quantum superposition, generating transient localized bound electron pairs and a concomitant opening of a pseudo-gap in the single-particle density of states. At low temperature, this pseudo-gap state transits via a first order hole doping induced phase transition into a superconducting state in which the localized transient bound electron pairs get spatially phase correlated. The mechanism driving that transition is a phase separation between two phases having different relative densities of bound and unbound electron pairs, which is reminiscent of the physics of ⁴He-³He mixtures.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 176-184
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 76.

Tytuł:: DC Characterization of the Coaxial Superconducting Cable
Autorzy:: Šouc, J.
Gömöry, F.
Vojenčiak, M.
Frolek, L.
Isfort, D.
Ehrenberg, J.
Bock, J.
Powiązania:: https://bibliotekanauki.pl/articles/1813698.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.25.Sv
74.25.Fy
84.71.Mn
Opis:: Coaxial cable model with superconducting core and superconducting shield conductor was constructed and tested in DC regime. While the core was already examined in our previous works, in this contribution the detailed study of the superconducting shield conductor in DC conditions is presented. It consists of 16 ReBCO coated tapes with critical current 35 A each connected in parallel. Using shunts with known values placed in series the currents in individual tapes were possible to measure. Distribution of the total cable current into the individual tapes was monitored and its influence on critical current of the cable is discussed.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 375-378
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 77.

Tytuł:: Electronic Structure and Fermiology of High-T$\text{}_{c}$ Superconductors
Autorzy:: Bansil, A.
Kaprzyk, S.
Powiązania:: https://bibliotekanauki.pl/articles/1929378.pdf
Data publikacji:: 1993-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.25.-s
74.20.Mn
74.25.Jb
Opis:: We briefly discuss some of our recent results in three areas, all related to issues concerning the electronic structure and fermiology of the high-T$\text{}_{c}$'s. (i) First-principles band theory based computations of the electron-positron momentum density relevant for the interpretation of the positron annihilation (2D-ACAR) experiments; results for YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ are discussed. (ii) Another k-resolved spectroscopy where such first-principles comparisons between the computed and measured spectral intensities have been crucially important is the angle-resolved photoemission experiment; we discuss results for the (001)-surface of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ where computations yield considerable insight into the nature and origin of the spectral signal associated with the CuO$\text{}_{2}$ plane bands. (iii) The study of effects of substitutions and of oxygen-vacancy disorder in the high-T$\text{}_{c}$'s; here results for the LaSrCuO$\text{}_{4}$, and Ba-K-Bi-O and Ba-Pb-Bi-O systems, with focus on the nature of the van Hove singularity in the vicinity of the Fermi energy are presented.
Źródło:: Acta Physica Polonica A; 1993, 84, 1; 7-20
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 78.

Tytuł:: On Strong Coupling Theory of Correlated Superconductors
Autorzy:: Wysokiński, K. I.
Powiązania:: https://bibliotekanauki.pl/articles/1955487.pdf
Data publikacji:: 1997-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.-z
74.25.Kc
74.20.Mn
Opis:: The strong coupling or Eliashberg equations of superconductivity have been generalised to describe strongly correlated systems. Calculations show that d-wave superconductivity is stable for small hole doping. It also follows that in correlated systems one should define three different Eliashberg functions and corresponding electron- phonon coupling constants λ$\text{}_{N}$, λ$\text{}_{S}$ and λ$\text{}_{tr}$ (to describe normal (N), superconducting (S) and transport (tr) properties) each of which is measured in different kind of experiment.
Źródło:: Acta Physica Polonica A; 1997, 91, 2; 329-332
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 79.

Tytuł:: Superconductivity in Hubbard Model with Correlated Hopping
Autorzy:: Bułka, B. R.
Robaszewska, M.
Powiązania:: https://bibliotekanauki.pl/articles/1955520.pdf
Data publikacji:: 1997-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.27.+a
71.30.+h
74.20.Mn
Opis:: Using the slave-boson method in its spin- and charge-rotational invariant representation we determine stability of the superconducting state in the Hubbard model with correlated hopping. In general the term with correlated hopping violates electron-hole symmetry, however, in the special case when the correlated hopping integral X is equal to the uncorrelated hopping integral t the electron-hole symmetry remains. We investigate this case and show that correlations induced by onsite Coulomb interactions U yield to the normal state with exactly single occupied sites (corresponding to |U=∞⟩). The phase diagram of the superconducting state is determined for the different electron concentration n. At the half-filled band (n=1) a direct transition from the Mott insulator to the superconducting state occurs.
Źródło:: Acta Physica Polonica A; 1997, 91, 2; 363-366
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 80.

Tytuł:: "Comb-Like" Polarons and Bipolarons in High-T$\text{}_{c}$ Materials
Autorzy:: Hankiewicz, E. M.
Buczko, R.
Wilamowski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/2012878.pdf
Data publikacji:: 2000-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.-z
75.10.-b
74.20.Mn
Opis:: Diagonalization of Hamiltonian composed from d-d exchange interactions between localized d spins of antiferromagnetic cluster and p-d interaction with the spin of carriers indicates a possibility of formation of pure magnetic polarons. The most energetically favorable solution occurs when the carrier density in CuO$\text{}_{2}$ planes is distributed on every second spin. These "comb-like" polarons have a tendency to bind into pairs (bipolarons) "glued" by the antiferromagnetic medium.
Źródło:: Acta Physica Polonica A; 2000, 97, 1; 185-188
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 81.

Tytuł:: Simple Band Model of Doped Fullerene Crystal
Autorzy:: Koper, A.
Mucha, M.
Powiązania:: https://bibliotekanauki.pl/articles/2012907.pdf
Data publikacji:: 2000-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.Mn
74.25.Kc
74.25.Jb
Opis:: We use quantum billiard with many scattering centers to describe conducting electrons properties in A$\text{}_{n}$C$\text{}_{60}$ crystals, where A denotes alkali metal. We focus our attention on the A$\text{}_{3}$C$\text{}_{60}$ crystal, for which we calculate the band structure, density of states, and conductivity for normal electrons. Conductivity shows linear dependence on temperature in this model, which agrees well with experimental data. We also discuss consequences of our results for superconductivity mechanism in A$\text{}_{3}$C$\text{}_{60}$ and possibilities of analogous approach to describe electron properties in fused fullerenes and multiply connected carbon clusters.
Źródło:: Acta Physica Polonica A; 2000, 97, 1; 233-236
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 82.

Tytuł:: Resonant Tunnelling in Double-Barrier Heterostructures with an Accumulation Layer
Autorzy:: Wosiński, T.
Figielski, T.
Mąkosa, A.
Wrotek, S.
Dobrowolski, W.
Powiązania:: https://bibliotekanauki.pl/articles/1992612.pdf
Data publikacji:: 1998-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.Gk
73.50.Jt
85.30.Mn
Opis:: Two modes of electron gas injection in resonant tunnelling through GaAs/AlGaAs double-barrier heterostructures were revealed while studying their current-voltage characteristics. Examining peculiarities of the characteristics within the temperature range 4-350 K and under a high magnetic field, we were able to distinguish the contribution to resonant tunnelling of ballistic electrons injected from a three-dimensional electron gas in the emitter contact and that of electrons injected from a two-dimensional electron gas in the accumulation layer formed near the emitter barrier.
Źródło:: Acta Physica Polonica A; 1998, 94, 3; 617-621
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 83.

Tytuł:: Origin of Imperfections in ⟨100⟩ SrLaAlO$\text{}_{4}$ Crystals
Autorzy:: Doerschel, J.
Hähnert, I.
Uecker, R.
Powiązania:: https://bibliotekanauki.pl/articles/1964346.pdf
Data publikacji:: 1997-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.65.Cf
81.30.Mn
61.72.Ff
Opis:: In Czochralski-grown SrLaAlO$\text{}_{4}$ crystals with ⟨100⟩ orientation, (001) planar faults extending through the entire crystal boule can frequently be observed. Chemical etching and transmission electron microscopy including energy dispersive X-ray spectroscopy were used to characterise their nucleation sites, these being located in the upper part of the crystal cone. Three serious sources were found: (1) lateral {001} facets, (2) grown-in defects in the seed, and (3) small particles of a second phase in the interior of the cone. These particles were identified as trigonal and cubic form of lanthanum oxide with a different Sr content.
Źródło:: Acta Physica Polonica A; 1997, 92, 1; 157-162
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 84.

Tytuł:: Pseudogap and Other Precursor Signatures in the Systems with Local Fermion Pairs
Autorzy:: Domański, T.
Powiązania:: https://bibliotekanauki.pl/articles/2038382.pdf
Data publikacji:: 2004-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.Mn
71.10.Li
03.75.Kk
Opis:: We consider precursor effects of the superconducting order which possibly show up in the normal state of high temperature superconducting materials. The local pairs of electrons or holes are formed there well above the transition temperature T$\text{}_{c}$. Due to strong quantum fluctuations the single particle density of states can be partly depleted near the Fermi energy leading to the pseudogap. We claim that this feature should go hand in hand with emergence of the Bogoliubov-type quasiparticles. In the normal state they are expected to be damped and acquire the long lifetime upon passing T$\text{}_{c}$. These Bogoliubov-type quasiparticles may nevertheless become correlated on a finite spatial and temporal scale. We discuss how such short-range pair correlations can be detected experimentally.
Źródło:: Acta Physica Polonica A; 2004, 106, 5; 553-560
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 85.

Tytuł:: Superconductivity, Weak Itinerant Ferromagnetism and Electronic Band Structure of Y$\text{}_{9}$Co$\text{}_{7}$
Autorzy:: Kołodziejczyk, A.
Wiendlocha, B.
Zalecki, R.
Toboła, J.
Kaprzyk, S.
Powiązania:: https://bibliotekanauki.pl/articles/2047310.pdf
Data publikacji:: 2007-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.25.Jb
74.25.Ha
74.20.Mn
Opis:: The paper presents experimental results for the intermetallic compound Y$\text{}_{9}$Co$\text{}_{7}$ which is the first very weak itinerant ferromagnetic superconductor. The measurements of electrical resistivity, susceptibility, magnetization, specific heat, nuclear magnetic resonance, and other properties show the magnetic transition at T$\text{}_{C}$≈ 4.5 K and the onset of superconductivity at about T$\text{}_{S}$≈ 2.5 K, revealing the coexistence state within a temperature interval below T$\text{}_{S}$. A few of the results are shortly reviewed and discussed. We focus attention on our recent ultraviolet photoemission spectroscopy and their comparison with our band structure calculations. Interpretations are considered which take into account the characteristic structure of the compound and different possible types of magnetic ordering.
Źródło:: Acta Physica Polonica A; 2007, 111, 4; 513-526
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 86.

Tytuł:: Nonfrustrated Antiferromagnet in a Frustrated Lattice Due to Charge Ordering: A Scenario for Pairing in Layered Cobaltates
Autorzy:: Wróbel, P.
Suleja, W.
Powiązania:: https://bibliotekanauki.pl/articles/2047314.pdf
Data publikacji:: 2007-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.10.Fd
74.20.Mn
75.50.Ee
Opis:: The mechanism of pairing-symmetry selection in the weakly electron doped t-J model on the honeycomb lattice has been analyzed. The discussion of that problem has been motivated by some recent suggestions that due to charge ordering which may take place in the unconventional superconductor Na$\text{}_{x}$CoO$\text{}_{2}$· yH$\text{}_{2}$O at doping levels near x=1/3 the physics of CoO$\text{}_{2}$ planes may be effectively described in terms of a model for a weakly electron doped antiferromagnet on the honeycomb lattice. In the current publication the main emphasis has been put on reviewing experimental and theoretical work, the results of which support the scenario of charge order. In the calculation, the so-called string picture has been used. It has been demonstrated that spin fluctuations may induce in the honeycomb lattice the formation of an unconventional two-particle bound state. Upon the condensation of bound particles this mechanism may give rise to unconventional pairing. The critical value of the ratio J/t which is sufficient to induce binding has not been evaluated. It has been assumed instead that in the case of cobaltates some additional isotropic attractive interaction, for example phonon mediated, is active. Despite that the exchange of spin fluctuations is not a dominating interaction, it selects the symmetry of the paired state because it is anisotropic. C$\text{}_{3v}$ is the relevant point group for the t-J model on the honeycomb lattice. It has been shown that the bound state of two additional electrons doped to the half-filled antiferromagnetically ordered system has zero total momentum and p-wave symmetry of the irreducible representation E. The expected paired state is a mixture of a singlet and a triplet because the honeycomb lattice does not possess the inversion symmetry.
Źródło:: Acta Physica Polonica A; 2007, 111, 4; 563-572
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 87.

Tytuł:: Fluctuations between the BCS and BEC Limits in the System of Ultracold Alkali Atoms
Autorzy:: Domański, T.
Donabidowicz, A.
Powiązania:: https://bibliotekanauki.pl/articles/2046728.pdf
Data publikacji:: 2006-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.Mn
03.75.Kk
03.75.Ss
Opis:: We investigate the fluctuations induced by time-dependent interchange between the Bardeen-Cooper-Schrieffer and Bose-Einstein condensation regimes in the ultracold gas of fermion atoms. Such crossover can be triggered by varying the external magnetic field across the Feshbach resonance. Experimental realization is usually done via very fast switching which leads to the nonequilibrium effects. In this paper we focus on the ground state properties. In particular, we analyze time dependence of the wave function and consider fluctuations of the order parameters.
Źródło:: Acta Physica Polonica A; 2006, 109, 4-5; 471-476
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 88.

Tytuł:: Control of Exciton Fine Structure Splitting in Quantum Dots
Autorzy:: Stevenson, R. M.
Young, R. J.
Atkinson, P.
Cooper, K.
Ritchie, D. A.
Shields, A. J.
Powiązania:: https://bibliotekanauki.pl/articles/2046985.pdf
Data publikacji:: 2006-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 03.67.Mn
78.67.Hc
78.55.Cr
Opis:: Quantum dots have been identified as potential sources of entangled photon pairs, essential for many applications in quantum information. However, in practice structural properties of the dots result in polarisation splitting of the emission lines, which has prevented the realisation of such a source. Here, we present two techniques developed to control the polarisation splitting in a quantum dot both irreversibly and reversibly. We find that the splitting is strongly dependent upon the emission energy, or lateral confinement, of the quantum dot. Thus by precise control of the InAs deposition thickness, it is possible to produce ensembles from which dots with zero polarisation splitting can be easily selected. Additionally, we demonstrate that by using modest in-plane magnetic fields to partially mix the bright and dark exciton states, the polarisation splitting can be reversibly tuned to zero for most dots of a certain type. Finally, we demonstrate the emission of triggered entangled photon pairs from a quantum dot with approximately zero splitting with fidelity >70%.
Źródło:: Acta Physica Polonica A; 2006, 110, 3; 311-318
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 89.

Tytuł:: Spin Polarons in Antiferromagnetic Planes
Autorzy:: Morkowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/2047298.pdf
Data publikacji:: 2007-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.27.+a
72.10.Di
74.20.Mn
Opis:: In the lecture the theory of spin polarons is reviewed on the basis of its analogy with the theory of lattice polarons. The energy dispersion curve for a single polaron in a two-dimensional antiferromagnetic square lattice is calculated in the self-consistent Born approximation. Also in self-consistent Born approximation the energy of a pair of interacting spin polarons is calculated. The results of calculations for realistic values of parameters of the model lead to the conclusion that pairing of spin polarons is not a likely mechanism of superconductivity in cuprates.
Źródło:: Acta Physica Polonica A; 2007, 111, 4; 397-408
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 90.

Tytuł:: Effect of Chemical Composition on Structure and Corrosion Resistance of Ni-Mn-Cu Cast Iron
Autorzy:: Medyński, D.
Janus, A.
Powiązania:: https://bibliotekanauki.pl/articles/383110.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: corrosion
martensitic transformation
austenitic cast iron
Ni-Mn-Cu cast iron
nickel equivalent
korozja
przemiana martenzytyczna
żeliwo austenityczne
żeliwo Ni-Mn-Cu
Opis:: In the paper, a relationship between chemical composition of Ni-Mn-Cu cast iron and its structure, hardness and corrosion resistance is determined. The examinations showed a decrease of thermodynamic stability of austenite together with decreasing nickel equivalent value, in cast iron solidifying according to both the stable and the metastable systems. As a result of increasing degree of austenite transformation, the created martensite caused a significant hardness increase, accompanied by small decline of corrosion resistance. It was found at the same time that solidification way of the alloy and its matrix structure affect corrosion resistance to a much smaller extent than the nickel equivalent value, in particular concentration of elements with high electrochemical potential.
Źródło:: Archives of Foundry Engineering; 2016, 16, 3; 59-62
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 91.

Tytuł:: Effect of hot deformation and isothermal holding temperature on retained austenite characteristics in 3-5% Mn multiphase steels
Autorzy:: Opiela, Marek
Grajcar, Adam
Pakieła, Wojciech
Powiązania:: https://bibliotekanauki.pl/articles/2204525.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: hot deformation
bainitic transformation
retained austenite
Mn effect
multiphase structure
manganese effect
austenit szczątkowy
struktura wielofazowa
efekt Mn
odkształacanie wysokotemperaturowe
przemiana bainityczna
Opis:: The paper presents stress-strain characteristics recorded during the four-step compression of axisymmetric samples in the Gleeble thermomechanical simulator. The hot deformability of three steels with Mn concentrations of 3%, 4% and 5% was compared. The analysis of the influence of plastic deformation and Mn content on the microstructure of alloys, and in particular, on a fraction and morphological features of the retained austenite, was performed. The proportion of the retained austenite was determined by the X-ray diffraction method. It was found that the content of Mn in the range from 3% to 5% does not have a significant impact on the high-temperature resistance of the steel during compression tests, but it has a significant influence on the microstructure of the steel and the fraction of retained austenite. The optimal conditions for maximizing the proportion of retained austenite were obtained at the temperature of 400 °C, and it decreased with increasing Mn concentration in the steel. It has been shown that it is related to the redistribution of carbon from the remaining austenite fraction with an increase in the manganese content. The mechanical properties were determined on the basis of hardness measurements.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 2; art. no. e144611
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 92.

Tytuł:: Mössbauer studies of single crystal gamma-Mn-Fe
Autorzy:: Szymański, K.
Olszewski, W.
Dobrzyński, L.
Satuła, D.
Jankowska-Kisielińska, J.
Powiązania:: https://bibliotekanauki.pl/articles/147239.pdf
Data publikacji:: 2004
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: gamma-Mn-Fe alloys
iron alloys
manganese alloys
Mössbauer spectroscopy
Opis:: Mössbauer measurements were performed on single crystals gamma-Mn60Fe37Cu3 in an external field of 1.3 T at room temperature. The hyperfine field distribution can be described as a vector sum of the external and internal fields. In addition, anisotropic response of magnetic moments was detected. The anisotropy, due to Fe atoms, has Fe-rich surroundings.
Źródło:: Nukleonika; 2004, 49,suppl.3; 75-78
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 93.

Tytuł:: Effect of Nickel Equivalent on Structure and Corrosion Resistance of Nodular Cast Iron Ni-Mn-Cu
Autorzy:: Medyński, D.
Janus, A.
Powiązania:: https://bibliotekanauki.pl/articles/381447.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: austenitic nodular cast iron
cast iron Ni-Mn-Cu
nickel equivalent
martensitic transformation
corrosion
żeliwo sferoidalne
żeliwo Ni-Mn-Cu
nikiel
przemiany martenzytyczne
korozja
Opis:: Within the research determined was the effect of nickel equivalent on structure, hardness and corrosion resistance of nodular cast iron Ni- Mn-Cu. The examinations revealed a drop of thermodynamic stability of austenite along with decreasing nickel content. Along with in-creasing degree of austenite transformation, the created martensite resulted in significant increase of hardness (and of abrasion resistance as well) of the examined of cast iron, accompanied by insignificant decrease of corrosion resistance.
Źródło:: Archives of Foundry Engineering; 2015, 15, 1 spec.; 69-74
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 94.

Tytuł:: Wózek 33MN do oczyszczarki tłucznia OT-84
Bogie 33MN for broken stone cleaner OT-84
Autorzy:: Sobaś, Marek
Powiązania:: https://bibliotekanauki.pl/articles/34573381.pdf
Data publikacji:: 2013
Wydawca:: Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
Tematy:: trzyosiowy wózek napędny
wózek 33MN
oczyszczarka tłucznia
układ biegowy
three-axle driving bogie
bogie 33MN
broken stone cleaner
running gear system
Opis:: W artykule przedstawiono opis trzyosiowego wózka napędnego 33MN dla oczyszczarki tłucznia OT-84. W artykule przedstawiono konstrukcję układu biegowego, która jest rozwiązaniem innowacyjnym i pierwszym tego typu w kraju. Zaprezentowano podstawowe węzły konstrukcyjne wózka 33MN.
The article describes a three-axle driving bogie 33MN for the broken stone cleaner OT-84. This paper presents the design of the running gear system which is an innovative solution and the first of this type in the country. The basic structural nodes of the bogie 33MN are shown.
Źródło:: Rail Vehicles/Pojazdy Szynowe; 2013, 3; 12-22
0138-0370
2719-9630
Pojawia się w:: Rail Vehicles/Pojazdy Szynowe
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 95.

Tytuł:: Production and separation of manganese-54 from alpha-irradiated V2O5 target
Autorzy:: Kłos, M.
Bartyzel, M.
Petelenz, B.
Powiązania:: https://bibliotekanauki.pl/articles/146185.pdf
Data publikacji:: 2006
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: ion-exchange chromatography
sotope production
54Mn
48V
cyclotron
Opis:: Our aim was to obtain and isolate the carrier-free gamma emitter, 54Mn. Manganese-54 was produced via cyclotron activation in the 51V(alfa,n)54Mn reaction, and separated from HCl solution on Dowex-50 . 8 resin. The effectiveness of chemical separation was checked using the internal tracer 48V, produced in a cyclotron via the natTi(p,xn)48V reaction. The microcomponent 54Mn was eluted from the column with 3 M HCl, and vanadium with a 0.1 M HCl/ethanol/H2O2 mixture. The pair Ti/48V was separated on Dowex-50 . 8, using 0.03 M HClO4 as the eluent for 48V and 1 M HClO4 for natTi. The carrier-free 54Mn was of 99.9% radionuclide purity. In separation of the carrierfree pair 54Mn/48V, the recovery yield was 98.7% for 54Mn and 96.4% for 48V.
Źródło:: Nukleonika; 2006, 51, 4; 221-224
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 96.

Tytuł:: Enhancement of Thermoelectric Efficiency and Optical Properties of Hydrogen Absorption in SiC:Mn Nanotube
Autorzy:: Shahraki, Amir Toofani
Gol, Heydar Ali Shafiei
Kimiagar, Salimeh
Dehnavi, Naser Zare
Powiązania:: https://bibliotekanauki.pl/articles/2106575.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: DFT
SiC:Mn-H NT
electronic property
thermometric
optical property
Opis:: The effects of hydrogen absorption and manganese substitution on structural, electronic, optical, and thermoelectric properties of silicon-carbon nanotubes (SiCNT) are studied using the density functional theory and the GGA approximation. An examination of the PDOS curves and the electronic band structure showed that the Mn substitution leads to an increase in magnetic anisotropy and the occurrence of semi-metallic behavior and that the hydrogen absorption shifts the band gap toward the lower energies. A study of these nanostructures’ thermoelectric behavior reveals that the H absorption leads to a significant escalation in the figure of merit of the SiCNT to about 1.6 in the room temperature range. The effects of the H absorption on this nanotube’s optical properties, including the dielectric functions and its absorption spectra, are also investigated.
Źródło:: Archives of Metallurgy and Materials; 2022, 67, 2; 397--403
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 97.

Tytuł:: Structure of MMCs with SiC Particles after Gas-tungsten Arc Welding
Autorzy:: Przełożyńska, E.
Braszczyńska-Malik, K. N.
Mróz, M.
Powiązania:: https://bibliotekanauki.pl/articles/379546.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: magnesium matrix composite
gas tungsten arc welding
Mg-Al-Mn alloy
SiC particle
microstructure
kompozyt magnezowy
spawanie łukowe
stop Mg-Al-Mn
cząstka SiC
mikrostruktura
Opis:: The gas-tungsten arc (GTA) welding behaviors of a magnesium matrix composite reinforced with SiC particles were examined in terms of microstructure characteristics and process efficiencies. This study focused on the effects of the GTAW process parameters (like welding current in the range of 100/200 A) on the size of the fusion zone (FZ). The analyses revealed the strong influence of the GTA welding process on the width and depth of the fusion zone and also on the refinement of the microstructure in the fusion zone. Additionally, the results of dendrite arm size (DAS) measurements were presented.
Źródło:: Archives of Foundry Engineering; 2015, 15, 4; 65-68
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 98.

Tytuł:: Study on Corrosion Behavior of Q235 Steel and 16Mn Steel by Electrochemical and Weight Loss Method
Autorzy:: Quan, Bianli
Xie, Zhiping
Powiązania:: https://bibliotekanauki.pl/articles/27324485.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: Q235 steel
16Mn steel
sulfur
corrosion mechanism
alkaline solution
Opis:: This study investigates the corrosion characteristics of Q235 steel and 16Mn steel in the sulfur-containing alkaline solution. The composition and the morphology of the corrosion products were analyzed by XPS and SEM respectively. The electrochemical behavior of Q235 steel and 16Mn steel was evaluated by potentiodynamic polarization curve and EIS. The results indicated that the corrosion rate of Q235 steel is greater than 16Mn steel in the early corrosion. Pitting and selective corrosion appeared on the surface of the two steels, and the surface product layer was granular and defective. XPS and EDS indicate that the structurally stable iron oxide is formed on the surface of the two steels. Electrochemical results show the corrosion kinetics of Q235 steel and 16Mn steel are simultaneously controlled by the charge transfer and ion diffusion, and the formation mechanism of corrosion products was clarified.
Źródło:: Archives of Metallurgy and Materials; 2023, 68, 2; 531--540
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 99.

Tytuł:: Copper-manganese-zinc spinels in zeolites : study of EMR spectra
Autorzy:: Decyk, P.
Więckowski, A. B.
Najder-Kozdrowska, L.
Bilkova, I.
Powiązania:: https://bibliotekanauki.pl/articles/146776.pdf
Data publikacji:: 2015
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: Cu-Mn-Zn spinels
electron magnetic resonance
paramagnetic complexes
Y zeolites
Opis:: The aim of this study is the application of electron magnetic resonance (EMR) spectroscopy to determine the interactions between NaY and HY zeolites and Cu-Mn-Zn spinels loaded onto the zeolite surfaces. The materials were characterized using XRD and IR spectroscopies. Four types of EMR lines were observed for Cu-Mn-Zn/NaY, Cu-Mn-Zn/HY samples. The difference between the EMR spectra recorded at 77 and 293 K has been shown. The spectra recorded at 77 K allowed us to distinguish between the species formed on NaY and HY zeolites. The EMR spectrum of Cu-Mn-Zn/NaY recorded at 77 K showed only one line attributed to antiferromagnetic spinels Cu1.4Mn1.6O4 and ZnMn2O4 or/and Cu0.5Zn0.5Mn2O4. The spinels appeared to be more stable (more strongly attached) on HY zeolite than on NaY one. It was proved that different strength of interactions between the zeolites and Cu-Mn-Zn spinels was caused by differences in the acidity of NaY and HY zeolites.
Źródło:: Nukleonika; 2015, 60, No. 3, part 1; 423-428
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 100.

Tytuł:: Effect of High-Temperature Annealing on the Cross-Tension Property of Resistance Spot Welded Medium-Mn Steel
Autorzy:: Zhao, Bingge
Wang, Yuanfang
Sun, Chenyu
Ding, Kai
Wu, Guanzhi
Wei, Tao
Pan, Hua
Gao, Yulai
Powiązania:: https://bibliotekanauki.pl/articles/2174565.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: medium Mn steel
resistance spot welding
cross-tension strength
martensite
fracture
Opis:: As one of the most promising 3rd generation advanced high strength steels (AHSS), medium Mn steels attract much attention because of their exceptional mechanical property and reasonable cost. However, their application in the modern automotive industry is limited by poor weldability. In this study, 7Mn steel was welded by resistance spot welding (RSW), which was followed by high-temperature annealing to increase the cross-tension property. With this effort, enhanced cross-tension strength (CTS) with a partial interfacial fracture (PIF) mode was realized. During the annealing after RSW that produced martensite, austenitization was realized and then evolved into martensite by the following air cooling. This process produced structure homogeneity across the joint. With respect to the RSW joint, martensite remained the dominant structure after annealing while the diffusion of C and Mn solutes was triggered. With the increase of annealing temperature, the diffusion was enhanced, and the grain boundary embrittlement was reduced, leading to higher CTS.
Źródło:: Archives of Metallurgy and Materials; 2022, 67, 4; 1293--1298
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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