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Wyświetlanie 1-15 z 27
Tytuł:
Transport Through a Single-Molecule Transistor: Master-Equation Approach
Autorzy:
Donabidowicz-Kolkowska, A.
Timm, C.
Powiązania:
https://bibliotekanauki.pl/articles/1431179.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.Hk
73.63.-b
81.65.+h
Opis:
In the present work we employ the master-equation approach to describe the transport through a molecule located in the central region between two external electrodes. In contrast to the transport through a quantum dot, electron-phonon coupling should be taken into account for tunnelling through a molecule. The coupling results in the appearance of additional effects such as vibrational sidebands or, for the case of strong coupling, a suppression of the current at low bias voltage (Franck-Condon blockade). In contrast to previous studies, the transport properties are described by the density matrix calculated explicitly with diagonal and off-diagonal elements. The observed phenomena are discussed and compared to previous studies.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 730-732
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topological Model of Austenite-Martensite Interfaces in Cu-Al-Ni Alloy
Autorzy:
Ostapovets, A.
Zarubova, N.
Paidar, V.
Powiązania:
https://bibliotekanauki.pl/articles/1418493.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.70.+h
Opis:
Discussion of the austenite-single-variant martensite interfaces in Cu-Al-Ni alloy is performed in the frame of a topological model of martensite interfaces. This model takes into account admissible defects lying in the interface. The results are compared with the experimental data obtained on the foils of Cu-Al-Ni alloys deformed in situ in a transmission electron microscope.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 493-496
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic Characteristics of 1D Structures
Autorzy:
Jaćimovski, S.
Raković, D.
Powiązania:
https://bibliotekanauki.pl/articles/1503228.pdf
Data publikacji:
2011-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.e
63.20.D
63.20.dk
63.20.kd
63.20.kg
63.20.kp
65.40.Ba
66.30.h
Opis:
In this paper 1D crystal lattice is analyzed within harmonic approximation, with one atom per elementary cell and nearest neighbor interaction included. For this type of crystal lattice dispersion relations are well known. Thermodynamic functions (specific heat and phonon thermal conductivity) are calculated via phonon density of states given in exact form. Thermodynamic variables are calculated for a whole temperature range. In limiting cases of low and high temperatures these thermodynamic variables can be found in analytic forms. For thermal conductivity the results of Callaway model for exact phonon density of states are compared with the results of Callaway model for Debye approximation of phonon density of states.
Źródło:
Acta Physica Polonica A; 2011, 120, 2; 231-233
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of titanium alloy modified with a-C:N:H and a-SiCxNY(H) coatings on adhesion and immune response of human osteoblast-like MG-63 cells
Autorzy:
Ścisłowska-Czarnecka, A.
Menaszek, E.
Kołaczkowska, E.
Januś, M.
Stypuła, B.
Powiązania:
https://bibliotekanauki.pl/articles/284995.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
titanium alloy
a-C:N:H and a-SiCxNy(H) coatings
osteoblast-like MG-63 cells
cell adhesion
cytokines
Opis:
The study was conducted in order to determine the effects of modified titanium alloy (Ti-6Al-4V) surfaces on the biological response of a human osteoblast-like cell line. MG-63 cells were cultured on disk-shaped Ti-alloys: unmodified, and covered with a-C:N:H or a-SiCxNy(H) layers. Interactions between materials and cells were examined through determination of cells adhesion and secretion of cytokines involved in the development of immune response.
Źródło:
Engineering of Biomaterials; 2008, 11, no. 81-84; 126-128
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Size Effects on the Electrical Resistivity of the Ultra-Thin Metallic Film
Autorzy:
Paja, A.
Działo, A.
Powiązania:
https://bibliotekanauki.pl/articles/1198662.pdf
Data publikacji:
2014-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.-h
73.50.Bk
73.63.-b
73.63.Hs
Opis:
In this article we investigate the electron-phonon interaction in metals in the system strongly reduced in one dimension. The Fermi sphere which represents the free-electron structure of a bulk metal was replaced by a discrete set of the Fermi disks. Using the variational expression for resistivity the temperature and film thickness dependences of the resistivity were derived and compared with experimental data.
Źródło:
Acta Physica Polonica A; 2014, 125, 5; 1220-1223
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Search for the Photo-Induced Hidden Phase in Inorganic and Organic Systems
Autorzy:
Koshihara, S.
Onda, K.
Okimoto, Y.
Ishikawa, T.
Powiązania:
https://bibliotekanauki.pl/articles/1489970.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.47.J-
63.20.kd
71.30.+h
71.45.Lr
Opis:
We review the dynamical behavior of strongly electron-lattice (orbital) coupled system induced by photo-excitation of fs laser pulse. By virtue of the femtosecond (fs) spectroscopy and picosecond (ps) time-resolved X-ray diffraction measurements, we demonstrate that the photo-irradiation creates new ordered state so called as "hidden phase" which can never be realized under thermo-equilibrium condition. This exotic phase commonly plays the key role for realizing the gigantic photo-induced changes in optical properties of inorganic and organic electron-lattice strongly coupled systems.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 328-331
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ROLA SYSTEMU PODATKOWEGO PRZED, W TRAKCIE I PO KRYZYSIE FINANSOWYM
THE ROLE OF A TAXATION SYSTEM BEFORE, DURING AND AFTER A FINANCIAL CRISIS
Autorzy:
Ciżkowicz, Piotr
Opala, Paweł
Rzońca, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/693028.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
system of taxation
fiscal crisis
automatic stabilisers
system podatkowy system of taxationkryzys fiskalny
automatyczne stabilizatory
mnożniki fiskalne
klasyfikacja JEL
E60
H30
H62
H63
Opis:
The aim of this paper is to sum up the most recent results of a survey carried out to analyse the role which the system of taxation played in subsequent phases of the financial crisis that started in 2008. As can be seen from the obtained data that role has been substantially changing: (1) prior to the crisis the tax incentives that the system made available to business entities gave rise to even greater economic imbalance which later became one of the elements that laid the basis for the crisis; (2) when the crisis started, the stabilisation role of the taxation system prevailed and operated through the working of so called automatic stabilisers as well as through discretionary changes of tax burdens; and (3) currently, the taxation system is being modified to support the process of fiscal consolidation expected to be implemented in the coming years in the economies of developed and some developing countries.
Celem niniejszego artykułu jest podsumowanie najnowszych wyników badań analizujących rolę systemu podatkowego w kolejnych fazach kryzysu zapoczątkowanego w 2008 r. Przeprowadzona w opracowaniu analiza wskazuje, że jego rola ulegała istotnym zmianom: 1) przed wybuchem kryzysu stwarzał bodźce do takich zachowań podmiotów gospodarczych, które przyczyniały się do narastania nierównowagi leżącej u podstaw kryzysu; 2) po jego wybuchu wzrosło znaczenie stabilizacyjne systemu podatkowego: zarówno w obszarze oddziaływania tak zwanych automatycznych stabilizatorów, jak i dyskrecjonalnych zmian obciążeń podatkowych; 3) obecnie zmiany systemu podatkowego zmierzają w kierunku wsparcia procesu konsolidacji fiskalnej oczekiwanej w najbliższych latach w wielu gospodarkach rozwiniętych i w części krajów rozwijających się.
Źródło:
Ruch Prawniczy, Ekonomiczny i Socjologiczny; 2012, 74, 1; 125-145
0035-9629
2543-9170
Pojawia się w:
Ruch Prawniczy, Ekonomiczny i Socjologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure Dependence of the Raman Modes Related to the Phase Transitions in Cyclohexane
Autorzy:
Yurtseven, H.
Cebeci, A.
Powiązania:
https://bibliotekanauki.pl/articles/1398881.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.70.+h
64.70.Dv
Opis:
The pressure dependence of the Raman frequencies for the $ν_{21}$ mode is studied by using the volume data at room temperature close to the transitions among the phases of III, IV and V in cyclohexane. By determining the pressure dependence of the mode Grüneisen parameter $γ_{T}$ in the phases and taking the average values, the Raman frequencies of those modes associated with the phase transitions are predicted through the volume data in cyclohexane. Our predicted Raman frequencies agree with those observed experimentally in this organic molecule. The Raman frequencies of the other modes can be calculated in cyclohexane and also in some molecular crystals using the method given here.
Źródło:
Acta Physica Polonica A; 2015, 127, 3; 744-747
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure Dependence of the Raman Frequencies of Ammonia Solid I near the Melting Point
Autorzy:
Yurtseven, H.
Powiązania:
https://bibliotekanauki.pl/articles/2025788.pdf
Data publikacji:
2001-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.70.+h
Opis:
We calculated in this study the Raman frequencies of some lattice modes in the melting region of ammonia solid I. The Raman frequencies of those phonon modes were obtained through the Grüneisen relation using the volume data for the ammonia solid I from the literature. Our calculated Raman frequencies require for comparison the experimental Raman frequencies measured as a function of pressure for some fixed temperatures in the ammonia solid I.
Źródło:
Acta Physica Polonica A; 2001, 99, 5; 557-564
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physics with Chemically and Isotopically Pure Semiconductors
Autorzy:
Haller, E. E.
Powiązania:
https://bibliotekanauki.pl/articles/1929597.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.-i
63.20.-e
66.30.-h
28.60.+s
Opis:
Chemically and isotopically pure semiconductors offer a wealth of interesting physics. We review a number of impurity complexes which were discovered in ultra-pure germanium. They have led the way to the widely pursued studies of hydrogen in numerous semiconductors. Isotope related effects and processes include neutron transmutation doping, a technique used for a number of silicon and germanium devices: isotopically pure and deliberately mixed crystals of germanium have been grown recently and have been used to study the dependence of the indirect bandgap and phonon properties on the mass and mass disorder of the nuclei. The large number of stable isotopes of the various semiconductors present a great potential for basic and applied studies. Semiconductor isotope engineering may become a reality because of the new economic and political world order.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 395-408
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nierównowaga finansów publicznych w wybranych państwach Europy Środkowo-Wschodniej
Public Finance Imbalance in Selected Cee Countries
Autorzy:
Szymańska, Agata
Powiązania:
https://bibliotekanauki.pl/articles/945536.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
H62
deficit
public debt
Treaty on the Functioning of the European Union
Stability and Growth Pact
deficyt
dług publiczny
Traktat o funkcjonowaniu Unii Europejskiej
Pakt stabilności i wzrostu
H63
Opis:
The aim of this article is to assess the public finance imbalance in selected CEE countries. The study examines public debt and deficit in six European Union Member States: Bulgaria, Croatia, the Czech Republic, Poland, Romania, and Hungary. The study revealed the growing imbalance in public finance in these countries, resulting mainly from the increased public debt. Moreover, the examined countries have problems with the implementation of supranational fiscal rule for budget balance, which resulted in the imposition of the Excessive Deficit Procedures.
Przedmiotem podjętych analiz jest ocena nierównowagi finansów publicznych w wybranych krajach Europy Środkowo-Wschodniej. W opracowaniu zbadano kształtowanie się długu publicznego oraz deficytu w sześciu państwach Unii Europejskiej: Bułgarii, Chorwacji, Czechach, Polsce, Rumunii oraz na Węgrzech. Przeprowadzone analizy wykazały, że w państwach tych narasta nierównowaga, wynikająca m.in. ze wzrostu zadłużenia publicznego. Ponadto poddane ocenie państwa wykazują problemy z realizacją reguły przewidzianej dla deficytu, co wpłynęło na nakładanie na nie procedur nadmiernego deficytu.
Źródło:
Gospodarka w Praktyce i Teorii; 2015, 4(41)
1429-3730
2450-095X
Pojawia się w:
Gospodarka w Praktyce i Teorii
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Semiconductor Devices
Autorzy:
Balestra, F.
Powiązania:
https://bibliotekanauki.pl/articles/1811906.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.-i
73.20.-r
73.21.-b
73.23.-b
73.30.+y
73.40.-c
73.50.-h
73.63.-b
Opis:
A review of recently emerging semiconductor devices for nanoelectronic applications is given. For the end of the international technology roadmap for semiconductors, very innovative materials, technologies and nanodevice architectures will be needed. Silicon on insulator-based devices seem to be the best candidates for the ultimate integration of integrated circuits on silicon. The flexibility of the silicon on insulator-based structure and the possibility to realize new device architectures allow to obtain optimum electrical properties for low power and high performance circuits. These transistors are also very interesting for high frequency and memory applications. The performance and physical mechanisms are addressed in single- and multi-gate thin film Si, SiGe and Ge metal-oxide-semiconductor field-effect-transistors. The impact of tensile or compressive uniaxial and biaxial strains in the channel, of high k materials and metal gates as well as metallic Schottky source-drain architectures are discussed. Finally, the interest of advanced beyond-CMOS (complementary MOS) nanodevices for long term applications, based on nanowires, carbon electronics or small slope switch structures are presented.
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 945-974
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular Electronics: A Review of Experimental Results
Autorzy:
Erbe, A.
Verleger, S.
Powiązania:
https://bibliotekanauki.pl/articles/1808307.pdf
Data publikacji:
2009-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.65.+h
73.63.-b
85.35.-p
Opis:
Molecular electronics aims for scaling down electronics to its ultimate limits by choosing single molecules as the building blocks of active devices. The advantages of this approach are the high reproducibility of molecular synthesis on the nanometer scale, the ability of molecules to form large structures by self-assembly, and the huge versatility of molecular complexes. On the other hand, conventional contacting techniques cannot form contacts on the single molecule scale and imaging techniques nowadays cannot provide a detailed image of such junctions. Therefore, the fabrication has to rely to some degree on self-organization of the constituents. The proof that a molecule has been contacted successfully can only be given by indirect methods, for example by measuring the current transport through the junctions. Here we give an overview of various techniques that were used successfully to contact molecules and to characterize them electrically. The techniques range from methods to contact single molecules to such which can be used to characterize ensembles of molecules. Especially, the comparison between such different techniques shows that a single measurement is always prone to artefacts originating from the unknown microscopic details of the junctions. It is therefore necessary to perform a statistically relevant number of measurements in order to resolve molecular properties. Various properties of the molecules can be studied. Special examples are the influence of conformational changes of the molecules, differences between various coupling endgroups of the molecules and effects of light-irradiation onto the molecular junctions.
Źródło:
Acta Physica Polonica A; 2009, 115, 2; 455-461
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetite Fe$\text{}_{3}$O$\text{}_{4}$: the Correlated Electron-Phonon System
Autorzy:
Kozłowski, A.
Kąkol, Z.
Tarnawski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2047312.pdf
Data publikacji:
2007-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
75.40.-s
63.20.Kr
71.30.+h
75.30.Cr
Opis:
In the paper the influence of magnetic as well as electron-lattice interactions on the Verwey transition in magnetite related compounds is discussed based on the authors' experimental activity and available literature. While magnetism was proved to only reflect the transition, the results of nuclear inelastic scattering show that lattice dynamics actively participates in it. The studies of diffuse neutron scattering and heat capacity suggest also that the low temperature lattice properties of slightly doped magnetite are distinct from those with higher dopant concentration. Finally, recent theoretical results strongly suggest that the Verwey transition in magnetite cannot be understood and described without strong involvement of electron-lattice interactions.
Źródło:
Acta Physica Polonica A; 2007, 111, 4; 537-547
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Temperature Crystal Structure Behaviour of Complex Yttrium Aluminium Oxides YAlO_3 and Y_3Al_5O_{12}
Autorzy:
Senyshyn, A.
Vasylechko, L.
Powiązania:
https://bibliotekanauki.pl/articles/1399474.pdf
Data publikacji:
2013-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
61.05.F-
65.40.De
65.60.+a
63.70.+h
Opis:
Crystal structures of two yttrium aluminium oxides, namely $YAlO_3$ and $Y_3Al_5O_{12}$, were investigated in the temperature range 3.4-300 K by high-resolution neutron powder diffraction. Neither traces of phase transformations nor discontinuous changes of physical properties were observed. Thermal expansion of yttrium aluminium oxides was evaluated in terms of 1st order Grüneisen approximation, where the Debye temperatures and the Grüneisen parameters have been estimated for both compositions. Anomalies in the thermal expansion of yttrium aluminium perovskite have been observed and modelled using the Einstein oscillator with negative Grüneisen parameter. Extended bond length analysis revealed significant thermally-driven modifications of the aluminium-oxygen framework.
Źródło:
Acta Physica Polonica A; 2013, 124, 2; 329-335
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 27

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