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Tytuł:
Liquidity of bitcoin – insights from Polish and global markets
Autorzy:
Włosik, Katarzna
Powiązania:
https://bibliotekanauki.pl/articles/962655.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
bitcoin
liquidity
Polish bitcoin market
JEL
G10
G23
płynność
polski rynek bitcoina
Opis:
Bitcoinem można obracać na wielu różnych platformach, wykorzystując do tego inne kryptowaluty, jak również waluty tradycyjne. Niemniej jego rzeczywista wymienialność może być ograniczona przez płynność rynku. Głównym celem artykułu jest scharakteryzowanie i porównanie wybranych giełd kryptowalut pod względem płynności. W tym celu przeanalizowano cztery platformy, które odznaczają się wysokim wolumenem obrotu: Kraken, Bitstamp, BitFlyer i BTCBOX, a także dwa małe podmioty umożliwiające handel w polskim złotym: BitBay i BitMarket. W artykule przedstawiono porównanie rynków pod względem liczby zawartych transakcji, średniego czasu pomiędzy kolejnymi transakcjami czy rozkładu wolumenu obrotu w ciągu dnia. Ponadto przeanalizowano zmiany w czasie miary płynności – ILLIQ. Wyniki pozwoliły stwierdzić, że platforma, która znajduje się wśród globalnych liderów w obrocie bitcoinem w danej walucie tradycyjnej, może być postrzegana jako podmiot mały, jeśli zostanie wzięty pod uwagę obrót w innej walucie tradycyjnej. Ponadto najbardziej popularne platformy umożliwiające wymianę bitcoina na polskiego złotego, czyli BitBay i BitMarket, mogą być uznane za rynki lokalne. Są one głównie wykorzystywane do handlu w złotym. W przypadku obrotu bitcoinem w innych walutach tradycyjnych cechuje je bardzo niska płynność. Czynniki takie jak home bias, możliwość handlu bitcoinem w mniej popularnej walucie tradycyjnej (w porównaniu ze światowymi walutami rezerwowymi) oraz interfejs użytkownika w języku polskim mogą dawać pewną przewagę konkurencyjną tym platformom.
Bitcoin can be exchanged for other cryptocurrencies as well as for fiat currencies on many different platforms. Nevertheless, its real convertibility may be limited by market liquidity. The main aim of this article is to characterize and compare big and small bitcoin markets in terms of liquidity. I examine four platforms with high trade volume: Kraken, Bitstamp, BitFlyer and BTCBOX, as well as small entities which enable bitcoin to be traded in Polish zloty: BitBay and BitMarket. I compare the number of trades and the time between trades on selected bitcoin markets, determine the volume distribution throughout the day and analyse the dynamics of Amihud’s illiquidity measure – ILLIQ. I find that an exchange which is among the global leaders in terms of trading bitcoin in a particular traditional currency can be considered a smaller market in terms of trade volume in another traditional currency. Moreover, the results imply that BitBay and BitMarket can be perceived as local markets. They are mainly used for trading in Polish zloty, and are illiquid in terms of trading in the remaining traditional currencies. Home bias, the fact that they offer a possibility of trading in a less popular currency (in comparison to the world reserve currencies), and that have their interface in Polish, may give these platforms a competitive advantage.
Źródło:
Ruch Prawniczy, Ekonomiczny i Socjologiczny; 2019, 81, 3; 167-183
0035-9629
2543-9170
Pojawia się w:
Ruch Prawniczy, Ekonomiczny i Socjologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zoning of foci of seismic tremors in division G-23, KGHM Polska Miedź SA
Autorzy:
Drzewiecki, J.
Powiązania:
https://bibliotekanauki.pl/articles/92090.pdf
Data publikacji:
2017
Wydawca:
Główny Instytut Górnictwa
Tematy:
copper ore mining
areas of energy accumulation
seismic tremors
górnictwo rud miedzi
obszary akumulacji energii
wstrząsy sejsmiczne
Opis:
The rock mass disturbed by mining activities in a copper ore mine has a structure consisting of thick layers of predominantly high mechanical parameters. The layers, due to their strength properties and dimensions, have low deformability which influences a vast area in the form of increased stresses. This area is a part of a rock massif where dynamic destruction periodically occurs in particular fragments as the post-mining cavity expands. The size of such an identified fragment of the rock mass depends on the extent of goafs and the distance between them and mining operations as well as inhomogeneities and confinement in the rock massif. The specific structure of the overlying layers, especially their mechanical properties, determine, to a vast extent, the cracks of anthropogenic influence in the rock massif, which result in foci of seismic tremors often recorded far from the areas of conducted mining activities. A selection of seismic tremors for their spatial location, related to the conducted mining operations and the time of their occurrence, can be useful for forecasting areas which determine seismic hazards in the area of mining operations. The aspect of the analysis of seismic tremors recorded in Division G-23 may indicate the location of the areas of the rock mass which remains in a state of boundary energy balance until another portion of seismic energy is released ‘stabilizing’ the area containing this rock mass. The article presents results of the analysis of a set of tremors between 2013 and 2015, induced by mining activities in Division G-23, in order to forecast areas of seismic activity in the rock mass disturbed by mining operations.
Źródło:
Journal of Sustainable Mining; 2017, 16, 2; 31-37
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spółki wynajmu rynku nieruchomości czy PL REITs?
Real estate leasing companies or real estate investment funds?
Autorzy:
Trzebiński, Artur A.
Powiązania:
https://bibliotekanauki.pl/articles/692826.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
real estate investment funds
REITs
real estate market
real estate leasing companies
JEL
G23
O12
fundusze nieruchomości
rynek nieruchomości
spółka wynajmu rynku nieruchomości
Opis:
In the mid-2016, the first unsuccessful attempt to introduce REITs into national legislation was made. In May 2017, the Ministry of Finance introduced a revised draft on real estate leasing companies (SWRN law) whose construction is similar to REITs. In the view of the opinion-making bodies, which is shared by the author of this article, the adoption of the SWRN law in the form proposed by the Ministry of Finance may produce results other than desired. Instead of increasing the involvement of domestic capital in the real estate market, SWRNsmay be used to support tax evasion and effectively stop the development of the real estate investment funds market in Poland. Therefore, in order to eliminate these dangers, certain modifications of the rules of the operation of SWRNs based on SWRN law and changes in the manner of operation of the existing real estate investment funds in Poland as well as solutions used in European countries were proposed.
W połowie 2016 r. podjęto pierwszą, nieudaną próbę wprowadzenia funduszy REITs do Polski. Kilka miesięcy później (maj 2017 r.) Ministerstwo Finansów przedstawiło poprawiony projekt ustawy o spółkach wynajmu rynku nieruchomości (SWRN), których konstrukcja jest zbliżona do REITs. Zdaniem podmiotów opiniujących projekt ustawy o SWRN i zdaniem autora przyjęcie ustawy w proponowanej formie może przynieść inne rezultaty, niż są zakładane przez projektodawcę. Zamiast zwiększenia zaangażowania krajowego kapitału na rynku nieruchomości, można spodziewać się wykorzystywania SWRN do optymalizacji podatkowej i zahamowania rozwoju rynku funduszy nieruchomości w Polsce. Dlatego też w celu wyeliminowania tych zagrożeń w artykule przedstawiono potencjalne bariery rozwoju rynku SWRN. Zaproponowano także zmiany w konstrukcji SWRN z uwzględnieniem zasady działalności istniejących do tej pory funduszy nieruchomości i rozwiązań stosowanych w różnych krajach europejskich, co może przyczynić się do zwiększenia atrakcyjności inwestycji pośrednich na rynku nieruchomości.
Źródło:
Ruch Prawniczy, Ekonomiczny i Socjologiczny; 2018, 80, 4; 243-255
0035-9629
2543-9170
Pojawia się w:
Ruch Prawniczy, Ekonomiczny i Socjologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear Data Evaluation for ²¹⁷Th
Autorzy:
Nafee, S.
Al-Ramady, A.
Shaheen, S.
Powiązania:
https://bibliotekanauki.pl/articles/1398746.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
21.10.-k
23.20.-g
23.35.+g
29.30.-h
Opis:
Thorium-217 was produced by the reaction ¹⁷⁰Er (⁵⁰Ti, xn) ^{220-x}Th. The nuclei were studied by Evaporation Residues gamma-alpha-gamma coincidence measurements (ER-γ-α-γ). The evaluated decay data for the ²¹⁷Th nuclide resulted from the above interaction is presented in this report. Three delayed γ-transitions (309, 673 and 1269 keV) have been measured from the ER-γ(-γ)-α correlations and γ-γ coincidences. They were assigned to ²¹⁷Th, based on the level systematics of the N=127 isotones. The evaluated half-lives T_{1/2} for these levels were assigned to be 64-₂₂⁺⁶⁴, 69-₁₇⁺³² and 66-₁₅⁺²⁷ μs, respectively. In addition, an isomeric state (2252+x) keV is presented in the ²¹⁷Th decay scheme between the 2252 (21/2+) and 2362 (25/2+) keV. Q (α) has been updated based on the recent published work of the Atomic Mass Evaluation AME2012 as well. Moreover, the total conversion electrons as well as the K-Shell to L-Shell, L-Shell to M-Shell and L-Shell to N-Shell conversion electron ratios have been calculated using BrIcc code v2.3.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 669-672
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PCR-RFLP detection of point mutations A2143G and A2142G in 23S rRNA gene conferring resistance to clarithromycin in Helicobacter pylori strains
Autorzy:
Klesiewicz, Karolina
Nowak, Paweł
Karczewska, Elżbieta
Skiba, Iwona
Wojtas-Bonior, Izabela
Sito, Edward
Budak, Alicja
Powiązania:
https://bibliotekanauki.pl/articles/1039295.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Helicobacter pylori
clarithromycin resistance
PCR-RFLP
point mutations
Opis:
Background. The occurrence of clarithromycin resistance among Helicobacter pylori strains is a major cause of the treatment failure. Resistance to this drug is conferred by point mutations in 23S rRNA gene and the most prevalent mutations are A2143G and A2142G. The aim of the study was to evaluate the occurrence of A2143G and A2142G mutations in a group of H. pylori strains resistant to clarithromycin. Materials and Methods. The study included 21 clarithromycin-resistant H. pylori strains collected between 2006 and 2009 in southern Poland. Resistance to clarithromycin was quantitatively tested with the E-test to determine the minimal inhibitory concentration (MIC value). The point mutations of H. pylori isolates were detected by PCR followed by RFLP analysis. Results. The MIC values for clarithromycin for the analyzed strains ranged from 1.5 mg/L to 64 mg/L. Nine H. pylori strains exhibited A2143G mutation and A2142G mutation was found in 9 isolates as well. The results of RFLP analysis of 3 clarithromycin-resistant strains were negative for both mutations. The average MIC values for A2143G and A2142G mutants were 6 and 30 mg/L, respectively. Conclusions. Frequencies of A2143G and A2142G mutations were the same in all isolates tested. Strains with A2143G mutation exhibited lower MIC values than A2142G mutants. Application of PCR-RFLP method for detection of clarithromycin resistance allows for better and more efficient management of H. pylori infections.
Źródło:
Acta Biochimica Polonica; 2014, 61, 2; 311-315
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Normy ostrożnościowe oceny ryzyka kredytobiorcy hipotecznego
Prudential standards for the assessment of a mortgage borrower’s credit risk
Autorzy:
Kruszka, Michał
Wroński, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/693864.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
supervisory measures; banking; real estate lending
nadzór bankowy; nadzór makroostrożnościowy; rynek nieruchomości; ryzyko systemowe; LTV; DSTI, DTI; JEL: G21, G28, K23
Opis:
The recent financial crisis revealed a significant link between the stability of the banking system and real estate lending. The aim of the article is to present the supervisory measures (in the narrow and in the broader sense) employed in banking as factors that can limit the demand for real estate lending. The study covers supervisory measures implemented in the European Economic Area countries. Supervisory instruments restricting the use of real estate as collateral for loans and instruments imposing income requirements on borrowers are discussed. Particular attention has been paid to the link between the priorities of financial market regulators in a given country and the international differentiation of the supervisory measures.
Ostatni kryzys finansowy ujawnił istotne powiązanie stabilności systemu bankowego z kredytowaniem nieruchomości. Celem artykułu jest przedstawienie narzędzi z zakresu nadzoru bankowego (sensu stricto, jak też largo) jako czynników, które mogą ograniczyć popyt na ten rodzaj kredytów. Badaniu poddano głównie środki nadzorcze zastosowane w państwach Europejskiego Obszaru Gospodarczego. Omówiono zakres stosowania środków nadzorczych ograniczających możliwość wykorzystania nieruchomości jako zabezpieczenia kredytu oraz środków nadzorczych ograniczających możliwość wykorzystania całego dochodu kredytobiorcy do spłaty kredytu. Szczególną uwagę poświecono międzynarodowemu zróżnicowaniu stosowanych środków nadzorczych, wskazując, jak odpowiadają one na priorytety regulatorów rynku finansowego w danym kraju.
Źródło:
Ruch Prawniczy, Ekonomiczny i Socjologiczny; 2019, 81, 4; 205-219
0035-9629
2543-9170
Pojawia się w:
Ruch Prawniczy, Ekonomiczny i Socjologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Ballistic Transport in Wires of n-PbTe
Autorzy:
Grabecki, G.
Wróbel, J.
Dietl, T.
Papis, E.
Kamińska, E.
Piotrowska, A.
Ueta, Y.
Sprinholtz, G.
Bauer, G.
Powiązania:
https://bibliotekanauki.pl/articles/1968110.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.-r
73.23.Ad
73.50.Dn
Opis:
We present results of magnetotransport studies on quantum wires of submicron PbTe epilayers, fabricated by means of electron beam lithography and dry etching. When the wire width is reduced down to 1 μm, the transition from diffusive to ballistic regime is observed. Effects associated with collimation and boundary scattering are found in the Hall, longitudinal, and van der Pauw magnetoresistance for wires and junctions in the shape of a cross.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 789-792
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure and Transport in Approximants of the Penrose Tiling
Autorzy:
Trambly de Laissardière, G.
Szállás, A.
Mayou, D.
Powiązania:
https://bibliotekanauki.pl/articles/1373694.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.23.Ft
71.30.+h
72.15.Rn
71.23.An
Opis:
We present numerical calculations of electronic structure and transport in the Penrose approximants. The electronic structure of perfect approximants shows a spiky density of states and a tendency to localization that is more pronounced in the middle of the band. Near the band edges the behavior is more similar to that of free electrons. These calculations of band structure and in particular the band scaling suggest an anomalous quantum diffusion when compared to normal ballistic crystals. This is confirmed by a numerical calculation of quantum diffusion which shows a crossover from normal ballistic propagation at long times to anomalous, possibly insulator-like, behavior at short times. The time scale $t^*(E)$ for this crossover is computed for several approximants and is detailed. The consequences for electronic conductivity are discussed in the context of the relaxation time approximation. The metallic-like or non-metallic-like behavior of the conductivity is dictated by the comparison between the scattering time due to defects and the time scale $t^*(E)$.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 617-620
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Irreducible green functions method applied to nanoscopic systems
Autorzy:
Górski, G.
Powiązania:
https://bibliotekanauki.pl/articles/1062052.pdf
Data publikacji:
2016-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.63.Kv
73.23.Hk
74.45.+c
Opis:
The equation of motion method for the Green functions is one of the tools used in the analysis of quantum dot system coupled with the metallic and superconducting leads. We investigate modified equation of motion, based on differentiation of double-time temperature dependent Green functions both over the primary time t and secondary time t'. Our equation of motion approach allows us to obtain the Abrikosov-Suhl resonance in the particle-hole symmetric case and also in the asymmetric cases. We will apply the irreducible Green functions technique to analyses of the equation of motion applied to the dot system. This method gives a workable decoupling scheme breaking the infinite set of the Green function equations. We apply this technique to calculate the density of the states and the differential conductance of single-level quantum dot with the Coulomb repulsion attached to one metallic and one superconducting leads (N-QD-SC). Our results are compared with the previous calculations.
Źródło:
Acta Physica Polonica A; 2016, 130, 2; 551-553
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoemission and Optical Spectroscopy of i-ZnMgEr Quasicrystal
Autorzy:
Suchodolskis, A.
Assmus, W.
Babonas, G.-J.
Giovanelli, L.
Karlsson, U. O.
Karpus, V.
Le Lay, G.
Rėza, A.
Uhrig, E.
Powiązania:
https://bibliotekanauki.pl/articles/2041813.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.23.Ft
Opis:
The results of photoemission and optical studies of icosahedral single-grain ZnMgEr quasicrystals are presented. Synchrotron radiation photoemission measurements were performed on in situ cleaved samples at 10$\text{}^{-10}$ mbar pressure and low, 140-150 K temperature. The valence band photoemission spectra measured reveal a simple metal-type valence band of icosahedral ZnMgEr with a distinct Fermi edge cut-off and with a sharp pseudogap feature. The photoemission spectra of shallow Mg 2p and Zn 3d core levels indicate a coordination shift of Mg 2p spin-orbit doublet and an oscillating dependence of Zn 3d photoemission line components on the photon energy within the hν=20-160 eV range investigated. The optical response of icosahedral ZnMgEr, a dispersion of the dielectric function, was measured by the spectroscopic ellipsometry technique in the 0.5-5.0 eV spectral range. The optical spectra of the quasicrystal indicate the Drude-type optical response superimposed with a peak of interband optical transitions. The interband optical transitions can be modelled with the pseudogap parameters which agree with those deduced in an analysis of the photoemission valence band spectra.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 412-419
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Current Shot Noise and Bunching of Electrons in Multilevel Quantum Dots
Autorzy:
Michałek, G.
Bułka, B.
Powiązania:
https://bibliotekanauki.pl/articles/1813512.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.-b
72.70.+m
Opis:
Currents and their fluctuations in multilevel quantum dots are studied theoretically in the limit of sequential tunneling. The spin degrees of freedom, many-body electronic states (singlet and triplet) as well as relaxation processes between the levels of the quantum dots are considered. In general, due to the rapid relaxation processes the shot noise is sub-Poissonian, however for a large polarization of the outgoing currents from the singlet and triplet states one gets the super-Poissonian type of the shot noise due to the bunching of tunneling events.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 27-30
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-Dimensional Analytical Threshold Voltage Modelling of Pseudomorphic $Si_{0.8}Ge_{0.2}$ p-Channel MOSFETs
Autorzy:
Ansaripour, G.
Powiązania:
https://bibliotekanauki.pl/articles/1492776.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.-b
Opis:
In this work we present an analytical model of the threshold voltage of SiGe p-channel metal oxide semiconductor field effect transistor based on the solution of the two-dimensional Poisson's equation and the ground state wave function of Fang and Howard, and taking into account the space charge in the channel and its effect on the surface potential. It is seen that the experimental data are well fitted within the experimental error that shows the appropriateness of the implemented model. Also comparing the calculated results to that of the calculated from the available recent reported models indicates a reasonable improvement to them.
Źródło:
Acta Physica Polonica A; 2011, 120, 6; 1043-1046
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interference Effects in Three-Terminal Hybrid Systems with Quantum Dots
Autorzy:
Michałek, G.
Bułka, B.
Powiązania:
https://bibliotekanauki.pl/articles/1403609.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.63.Kv
74.45.+c
73.23.-b
Opis:
Conductance in a three-terminal hybrid system with two quantum dots is analyzed. Our attention is focused on an influence of decoherence on interference effects in the Andreev transport. In particular, we have found that a change of coupling to the third electrode can strongly modify a shape of the Fano-type resonances. This effect is due to activation of nonlocal Andreev reflection (CAR) processes.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 981-983
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ballistic Transport Phenomena in Nanostructures of Paraelectric Lead Telluride
Autorzy:
Grabecki, G.
Powiązania:
https://bibliotekanauki.pl/articles/2047366.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Jc
73.21.Hb
73.23.Ad
77.22.Ch
Opis:
This is a review of our recent developments in the physics of lead telluride nanostructures. PbTe is a IV-VI narrow gap paraelectric semiconductor, characterized by the huge static dielectric constant ε >1000 at helium temperatures. We nanostructurized this material by means of e-beam lithography and wet chemical etching of modulation doped PbTe/Pb$\text{}_{1-x}$Eu$\text{}_{x}$Te quantum wells. Magnetoresistance measurements performed on the nano-structures revealed a number of magnetosize effects, confirming a ballistic motion of the carriers. The most important observation is that the conductance of narrow constrictions shows a precise zero-field quantization in 2e$\text{}^{2}$/h units, despite a significant amount of charged defects in the vicinity of the conducting channel. This unusual result is a consequence of a strong suppression of the Coulomb potential fluctuations in PbTe, an effect confirmed by numerical simulations. Furthermore, the orbital degeneracy of electron waveguide modes can be controlled by the width of PbTe/Pb$\text{}_{1-x}$Eu$\text{}_{x}$Te quantum wells, so that unusual sequences of plateau conductance can be observed. Finally, conductance measurements in a nonlinear regime allowed for an estimation of the energy spacing between the one-dimensional subbands.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 127-139
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of Current Auto- and Cross-Correlations in Double Quantum Dots
Autorzy:
Michałek, G.
Bułka, B.
Powiązania:
https://bibliotekanauki.pl/articles/1810396.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.Hk
73.63.Kv
73.50.Td
Opis:
Studies of an enhancement of current shot noises are presented for a device of two large quantum dots coupled capacitively. We analyze current-current correlation functions, and show that a dynamical Coulomb blockade is responsible for an enhancement of the Fano factors. This process can lead also to an electron bunching and positive current cross-correlations. Our theoretical results are discussed in light of recent shot noise experiments.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 117-119
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scattering Theory of the Johnson Spin Transistor
Autorzy:
Geux, L. S.
Brataas, A.
Bauer, G. A.
Powiązania:
https://bibliotekanauki.pl/articles/2011231.pdf
Data publikacji:
2000-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Gk
73.23.Hk
75.70.Pa
Opis:
We discuss a simple, semiclassical scattering theory for spin-dependent transport in a many-terminal formulation, with special attention to the four terminal device of Johnson referred to as spin transistor.
Źródło:
Acta Physica Polonica A; 2000, 97, 1; 119-128
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Response of fci-ZnMgHo Quasicrystal
Autorzy:
Karpus, V.
Babonas, G.
Rėza, A.
Suchodolskis, A.
Tumėnas, S.
Hunderi, O.
Assmus, W.
Brűhne, S.
Powiązania:
https://bibliotekanauki.pl/articles/1813393.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.23.Ft
Opis:
The results of an optical spectroscopy study of the icosahedral fci-ZnMgHo quasicrystal are presented. The dielectric function of the quasicrystal was measured by the spectroscopic ellipsometry technique in the spectral range of 0.1-5.0 eV. The analysis of the dielectric function shows that an optical response of fci-ZnMgHo is a superposition of the free-electron Drude-type contribution and that of the interband transitions across the fci-ZnMgHo pseudogap.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 1005-1008
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time Differential Perturbed Angular γγ-Correlation Studies of Diethylenetriaminepentaacetic Acid Complexes with $\text{}^{111}$In and $\text{}^{111m}$Cd
Autorzy:
Shpinkova, L. G.
Carbonari, A. W.
Nikitin, S. M.
Mestnik-Filho, J.
Powiązania:
https://bibliotekanauki.pl/articles/2029030.pdf
Data publikacji:
2001-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
23.20.En
23.40.-s
61.66.Hq
Opis:
Static and dynamic electric quadrupole interactions of $\text{}^{111}$Cd in complexes with diethylenetriaminepentaacetic acid were studied by the time differential perturbed angular γγ-correlation technique using two parent isotopes, $\text{}^{111}$In(EC)$\text{}^{111}$Cd and $\text{}^{111 m}$Cd. The measurements were carried out using neutral aqueous solutions of the diethylenetriaminepentaacetic- acid-complexes with initial isotopes at 293 K and 77 K. It was shown that the $\text{}^{111}$Cd-diethylenetriaminepentaacetic-acid-complex in aqueous solutions at pH = 7.0 is characterised by the re-orientational correlation time of 7.7×10$\text{}^{-11}$ s and an electric field gradient V$\text{}_{zz}$=6.7(2)×10$\text{}^{21}$ V/m$\text{}^{2}$ with an asymmetry parameter η=0.75(5). A direct comparison of the electric quadrupole interaction parameters for diethylenetriaminepentaacetic- acid-complexes with $\text{}^{111}$In and $\text{}^{111m}$Cd confirmed the proposal about the fragmentation of the complexes caused by the after-effects of electron capture in $\text{}^{111}$In. An observed difference in the electric quadrupole interaction parameters obtained for the solutions with $\text{}^{111}$In and $\text{}^{111m}$Cd complexes reflects a process of a chemical rearrangement of the complex structure after the In decay into Cd
Źródło:
Acta Physica Polonica A; 2001, 100, 5; 799-805
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation and evaluation of morphological trials, biological features and seed yield of 23 flax accessions (Linum usitatissimum L.) of different geographical origins
Autorzy:
Silska, G.
Bocianowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/72733.pdf
Data publikacji:
2018
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Opis:
Introduction: The Institute of Natural Fibres and Medicinal Plants (INF&MP) is involved in the protection of the genetic resources of flax (Linum usitatissimum L.) and hemp (Cannabis sativa L.). In 1998–2000, the INF&MP conducted research titled “Collection and evaluation of flax and hemp cultivars and ecotypes”. Poland participates in the programme, financed by the Ministry of Agriculture and Rural Development because our country has signed the Convention on Biological Diversity. Objective: The objective of the research was the evaluation of the genetic resources of 23 accessions of flax. The characteristics data for flax accessions are presented according to traditional methodology and according to the methodology for developing the International Flax Data Base. Methods: Field trials were carried out in 1998–2000 in the experimental station in Wojciechów, located in the Opolskie region. The objective was to evaluate the morphological traits, biological features and seed yield of 23 accessions of flax. The research included the following genotypes of Linum usitatissimum L. according to type of use: 12 linseed varieties, three landraces, one accession of unknown type of use, six fibre varieties and one genotype of both types of use. Results: The total plant length of Linum was short for 12 accessions of flax, medium short (7) and medium (4). The technical length was short (17 accessions), medium short (3) and medium (3). The stem thick-ness for all accessions was medium, i.e. between 1.2 and 2.0 mm. The panicle length was short (12 accessions), medium (10) and long (1). A number of primary lateral branches of the stems of all flax accessions was medium (4–8 branches). The 1000 seed weight was low for 21 accessions of flax and very low in two genotypes: Currong and UKR 97 104. The size of the corolla (flower) was small (9), medium (12) and large (2) – varieties: Martin and Maxigold. The petal colour of the corolla was blue (11), light blue (8) and white (4) – Crystal, Hella, Kreola, Achay. Conclusions: Morphological characterisation of the stamen showed that accession K-1390 was segregating because the anther colour was bluish and greish. The highest resistance to lodging was observed for Abby, Peak and Olinette. The following accessions of flax were very resistant to Fusarium: Martin, UKR 97 269, Kijewskij and Ukraińskij 3; resistant to Fusarium: Abby, Peak, Olinette, Crystal, Gold Merchant, Currong and Ukraińskij 2. The following varieties were very susceptible to Fusarium: Hella, Kreola, Maxigold and Achay. These varieties should not be used for cross breeding. The best average seed yield in 1998–2000 in Wojciechów was found in the following accessions of flax: Abby (191%), Gold Merchant (162%), Currong (161%), Olinette (151%), PEAK (148%), UKR 97 269 (148%), Crystal (138%), Ukraiński 3 (132%), Martin (130%), Pacific (110%) and Ukraiński 2 (103%). These varieties are particularly valuable for flax breeders.
Źródło:
Herba Polonica; 2018, 64, 4
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
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