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Wyświetlanie 1-100 z 159
Tytuł:
RGW90 I RGW110 a potrzeby Wojska Polskiego
Autorzy:
Borecki, Zbigniew.
Powiązania:
Wojsko i Technika 2020, nr 4/5, s. 40-43
Data publikacji:
2020
Tematy:
Dynamit Nobel Defence
Przemysł zbrojeniowy
Przetarg publiczny
Handel
Planowanie
Granatniki przeciwpancerne
RGW 90 HH (granatnik)
RGW 90 HH-T (granatnik)
RGW 110 HH-T (granatnik)
RGW 90 ASM (granatnik)
Artykuł z czasopisma fachowego
Artykuł z czasopisma wojskowego
Opis:
Artykuł dotyczy przetargu publicznego na lekki jednorazowy granatnik przeciwpancerny dla Wojska Polskiego. Przedstawiona została oferta niemieckiej spóki Dynamit Nobel Defence, światowego lidera w dziedzinie broni odpalanej z ramienia. Omówione zostały cechy konstrukcyjne i zalety kilku modeli granatników przeciwpancernych.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Ecology, evolution, distribution and population of Hexagonaria in Western Europe
Autorzy:
Tsien, H.H.
Powiązania:
https://bibliotekanauki.pl/articles/22840.pdf
Data publikacji:
1980
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
The record of Hexagonarta in the Lower and Middle Devonian shows that only slow rates of change occurred at these times, whereas in Frasnian time there occurred complex diversity and speciation patterns. Very rapid faunal changes and mass extinctions in corals have been observed near the boundary of Middle Devonian and Upper Devonian and at the end of Fr 1 time. Based on the study of population variation, ecological variation and phylogenetic lineage, the complete evolutionary patterns of Hexagonaria can be traced in the Givetian and Frasnian. The evolutionary patterns observed in different facies demonstrate that: 1. most changes in diversity and speciation were strictly related to differences in the biology of species adapted to different or changing environments, 2. the critical factors in encouraging diversification of species appear to be a combination of ecologic conditions and paleogeographic situations, 3. some parallel evolutions were independent of environments and paleogeographic isolation but were due to time.
Źródło:
Acta Palaeontologica Polonica; 1980, 25, 3-4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of Users Activity on Web-Blogs
Autorzy:
Kozioł, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1398897.pdf
Data publikacji:
2016-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.65.-s
89.20.Hh
05.30.-d
Opis:
Activity of users on Internet discussion forums is analyzed. The rank of users is shown to be approximated better by stretched-exponential function than by the Zipf law. Cumulative distribution function is found as an excellent tool in analysis of the dynamics of the collective social phenomena. We are able to approximate the number of blog comments with time by simple sigmoidal functions: probability of posting a comment is given by P(t)=P₀(t)/[1+P₀(t)], where $P_0(t)=(t//t_0)^{β}$ and β is close to 1.
Źródło:
Acta Physica Polonica A; 2016, 129, 5; 1060-1063
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Kelvin Probe Microscopy for Nitride Heterostructures
Autorzy:
Bożek, R.
Powiązania:
https://bibliotekanauki.pl/articles/2043699.pdf
Data publikacji:
2005-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.79.-v
61.72.Hh
68.37.-d
Opis:
Kelvin probe microscopy is an experimental technique designed to investigate fluctuations of surface potential (work function per electron) related to distribution of electric charge or variations in composition. The paper describes principle and precision of measurements. The results obtained for group-III nitrides semiconductor heterostructures grown on c-plane sapphire by metal-organic vapour phase epitaxy are presented. The observations concerns defects: inversion domains for Ga- and N-polar layers, threading dislocations and effects of spontaneous polarization leading to 2D carrier gas. To achieve insight in the evolution of defects, bevelled and cross-sectioned samples were investigated along with surface of "as grown" layers. Applicability of standard Kelvin probe microscopy method was also extended by investigating dependence of the surface potential on variable wavelength illumination, offering opportunity for spectroscopy of individual defects.
Źródło:
Acta Physica Polonica A; 2005, 108, 4; 541-554
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometry Optimization of Pulsed Inductors
Autorzy:
Bartkevičius, S.
Novickij, J.
Višniakov, N.
Powiązania:
https://bibliotekanauki.pl/articles/1807966.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.55.Db
84.32.Hh
85.70.Ay
Opis:
The optimization of pulsed power inductors' geometry is a difficult multi-dimensional task. On the one hand, an inductor could be destroyed because of the Joule overheating, on the other hand, it might be damaged by the Lorentz forces acting in its windings. The magnetic field pulse up to 50 T is the target while fields of this magnitude are the interest in many scientific applications. All factors mentioned are directly dependent on inductor's geometry, i.e. on the number of winding layers and windings per layer. Therefore, a detailed analysis of thermodynamic, electromagnetic and mechanical processes is inevitable and was carried out for different geometrical inductor configurations to reach the goal: a non-destructive inductor that can meet required magnetic field parameters. Direct calculation methods were used to create universal algorithms in MATLAB environment. The zone of inductor geometries, where stresses do not exceed the yield strength of materials, inductor is not overheated and generated magnetic field magnitude is in acceptable range, is given as a result which enables to manufacture new prototypes saving additional costs and time.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 1155-1157
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CVD growth of high speed SiGe HBTs using SiH4
Autorzy:
Radamson, H.H.
Grahn, J.
Landgren, G.
Powiązania:
https://bibliotekanauki.pl/articles/309308.pdf
Data publikacji:
2000
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
SiGe
epitaxy
HBT
silane
Opis:
The growth of high frequency HBT structures using silane-based epitaxy has been studied. The integrity of SiGe layers in the base and the control of the collector profile using As- or P-doping grown at 650°C have been investigated. The results showed that the growth rate of SiGe layers has a strong effect on the evolution of defect density in the structure. Furthermore, B-doped SiGe layers have a higher thermal stability compared to undoped layers. The analysis of the collector profiles showed a higher incorporation of P in silane-based epitaxy compared to As. Meanwhile, the growth of As- or P-doped layers on the patterned substrates suffered from a high loading effect demanding an accurate calibration.
Źródło:
Journal of Telecommunications and Information Technology; 2000, 3-4; 10-14
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic Structure Factor of Ultracold Bosons in Optical Lattice
Autorzy:
Zaleski, T.
Kopeć, T.
Powiązania:
https://bibliotekanauki.pl/articles/1398602.pdf
Data publikacji:
2016-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.75.Hh
05.30.Jp
67.85.Hj
Opis:
Ultracold atoms in optical lattices have been intensively investigated in recent years as they provide a very well controllable environment for observation of many-body quantum phenomena, closely mimicking physics of strongly interacting electronic systems. Here, we use the quantum rotor approach supplemented by the Bogolyubov method to investigate one- and two-particle excitations, which are a measure of inter-particle correlations. We calculate one-particle spectral function and dynamic structure factor, which can be observed using spectroscopy of cold atomic systems. Our calculations require a significant numerical effort to determine multidimensional convolutions of momentum and frequency dependent constituents functions, which we achieve using parallelised fast Fourier transform. We observe the appearance of sharp coherence peaks in the superfluid phase of the cold bosons, which closely resembles the formation of sharply defined quasiparticle excitations below $T_{c}$ in cuprates or smeared excitation spectra characteristic for strongly interacting systems.
Źródło:
Acta Physica Polonica A; 2016, 130, 2; 564-568
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Brief des HH. Prof. Ireneusz Stolarczyk, Dekan der Theologischen Fakultät, Sektion Tarnów, der Päpstlichen Universität Johannes Paul II. in Krakau
Autorzy:
Stolarczyk, Ireneusz
Powiązania:
https://bibliotekanauki.pl/articles/668091.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Papieski Jana Pawła II w Krakowie
Źródło:
The Person and the Challenges. The Journal of Theology, Education, Canon Law and Social Studies Inspired by Pope John Paul II; 2011, 1, 1
2391-6559
2083-8018
Pojawia się w:
The Person and the Challenges. The Journal of Theology, Education, Canon Law and Social Studies Inspired by Pope John Paul II
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the temperature dependence of the helical pitch in 1.m.7(HH) liquid crystalline compounds
Wyznaczanie zależności skoku helisy od temperatury dla związków ciekłokrystalicznych 1.m.7(HH)
Autorzy:
Zieja, P.
Tykarska, M.
Strójwąs, K.
Powiązania:
https://bibliotekanauki.pl/articles/211268.pdf
Data publikacji:
2018
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
ciekłe kryształy
faza antyferroelektryczna
skok helisy
badania mieszalności
liquid crystals
antiferroelectric phase
helical pitch
miscibility study
Opis:
Homologous series 1.m.7(HH) of liquid crystalline compounds, varying in the chiral chain length m (m=4-9), were studied. These compounds are characterized by a long helical pitch in an antiferroelectric phase, which is higher than the measuring range of the available instruments. The temperature dependence of the helical pitch of these compounds was determined by the extrapolation of the results obtained for the mixtures of 1.m.7(HH) compounds with 1.4.7(HF) compound of a known helical pitch value. The helical pitch measurements were made by spectrophotometry and phase transition temperatures were measured by polarizing thermomicroscopy. Extrapolation of the results let established that the investigated liquid crystals are characterized by the helical pitch increasing and then decreasing upon heating, which is accompanied by the helical twist sense inversion from the right-handed structure to the left-handed one.
Przedmiotem badań był szereg homologiczny związków ciekłokrystalicznych 1.m.7(HH) różniących się długością łańcucha chiralnego m (m = 4-9). Związki te charakteryzują się długim skokiem helisy w fazie antyferroelektrycznej, większym niż zakres pomiarowy dostępnej aparatury. Zależność skoku helisy od temperatury wyznaczono, ekstrapolując wyniki pomiarów skoku helisy otrzymane dla mieszanin związków 1.m.7(HH) ze związkiem 1.4.7(HF) o znanym skoku. Pomiary skoku helisy wykonano metodą spektrofotometryczną, natomiast temperatury przemian fazowych zmierzono za pomocą polaryzacyjnego mikroskopu optycznego. Ekstrapolacja wyników pozwoliła ustalić, że badane ciekłe kryształy charakteryzują się skokiem helisy zwiększającym się, a następnie zmniejszającym ze wzrostem temperatury, czemu towarzyszy inwersja skrętności helisy z prawoskrętnej na lewoskrętną.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2018, 67, 2; 51-62
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Diagram of Mixtures of Ultracold Bosons in Optical Lattice
Autorzy:
Anufriiev, S.
Zaleski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1398645.pdf
Data publikacji:
2016-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.75.Hh
05.30.Jp
67.85.Hj
Opis:
We study a behaviour of mixture of two species of ultracold bosons trapped in optical lattice. Using mean-field approximation, we determine the phase diagram of the system for wide range of parameters. We observe that each of the groups of atoms can condense into superfluid state or localize and form the Mott insulator, which yields that the whole system is either superfluid, the Mott insulator, or a mixed state. It appears that introduction of interaction between different kinds of atoms can strongly renormalise the phase diagram. It can alter the critical behaviour modifying multi-criticality of crossing points and order of phase transitions between mixed and superfluid states.
Źródło:
Acta Physica Polonica A; 2016, 130, 2; 629-632
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coherence Properties of Coupled Chaotic Map Lattices
Autorzy:
Janowicz, M.
Orłowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1492426.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Ra
45.70.Qj
03.75.Hh
03.75.Nt
Opis:
Strong global correlations in the systems of coupled chaotic map lattices based on a modified logistic map are investigated. It is shown that, in the parameter range close to the edge of chaos as defined for an individual map, the systems exhibit off-diagonal long-range order and single-particle reduced density matrices defined in a natural way possess one strongly dominant eigenvalue. In addition, pattern formation [13] in the above systems has been investigated.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-114-A-118
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Google Matrix of the World Trade Network
Autorzy:
Ermann, L.
Shepelyansky, D.
Powiązania:
https://bibliotekanauki.pl/articles/1492497.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.65.Gh
89.75.Hc
89.75.-k
89.20.Hh
Opis:
Using the United Nations Commodity Trade Statistics Database we construct the Google matrix of the world trade network and analyze its properties for various trade commodities for all countries and all available years from 1962 to 2009. The trade flows on this network are classified with the help of PageRank and CheiRank algorithms developed for the World Wide Web and other large scale directed networks. For the world trade this ranking treats all countries on equal democratic grounds independent of country richness. Still this method puts at the top a group of industrially developed countries for trade in all commodities. Our study establishes the existence of two solid state like domains of rich and poor countries which remain stable in time, while the majority of countries are shown to be in a gas like phase with strong rank fluctuations. A simple random matrix model provides a good description of statistical distribution of countries in two-dimensional rank plane. The comparison with usual ranking by export and import highlights new features and possibilities of our approach.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-158-A-171
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of EGNOS-Augmented GPS Receiver Positioning Accuracy
Autorzy:
Skorkowski, A.
Topór-Kamiński, T.
Powiązania:
https://bibliotekanauki.pl/articles/1417964.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.10.Pr
89.20.Hh
06.20.Dk
07.05.Hd
Opis:
This study presents the operation basis of GPS global positioning system and augmentation systems used to increase positioning accuracy. Furthermore, selected measurement results for an EGNOS-augmented GPS receiver positioning are included along with an analysis of GIS measurements accuracy, performed using differential corrections. This analysis takes into consideration the impact of the number of measurement series and satellite constellation on the accuracy of positioning achieved in praxis using the EGNOS system.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 821-824
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Państwo i Naród, kościół, meczet, synagoga. Nieunikniona debata
State and Nation; Church, Mosque and Synagogue. The debate that won’t go away
Autorzy:
Weiler, Joseph H.H.
Powiązania:
https://bibliotekanauki.pl/articles/518845.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Jagielloński. Fundacja Utriusque Iuris
Opis:
Church and State – although within a couple of decades this concept seemed to be out of date and pushed somewhere in between typology and taxonomy – it came back suddenly to the current discourse in numerous publications, articles and books clarifying with due weight various models of the co-existence of Church and State. The debate relates to the Christian culture, being on the way out in the secular Europe, and its place in self-reflection and self-understanding by nations and countries of the Old Continent. The subject of an animated discussion was a possible reference to „the Christian roots” as a part of the cultural heritage of the EU in the preamble of its the would-have-been constitution. At present, similar issues such as displaying crucifixes in public schools are debated in individual countries – it was decided i.a. by the German Federal Constitutional Court, and is discussed by lawyers in other countries. The above issue was also the subject of the decision held by the Grand Chamber of the European Court of Human Rights after the judgment as of November 2009 in case Lautsi v. Italy regarding the complaint of Soile Lautsi.
Źródło:
Forum Prawnicze; 2011, 1 (3); 37-45
2081-688X
Pojawia się w:
Forum Prawnicze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of a Polish Internet-Based Social Network
Autorzy:
Zmarzłowski, K.
Mazur, P.
Orłowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1538567.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.65.Gh
89.65.Ef
89.20.Hh
02.50.-r
Opis:
Dynamics of a number of new users registering for the first time to a Polish internet-base social network http://Grono.net is investigated via various regression models. Trends are estimated and the statistical significance of their forecasting is tested.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 700-702
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D Discrete Dislocation Dynamics: Influence of Segment Mobility on Critical Shear Stress
Autorzy:
Záležák, T.
Dlouhý, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402114.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Hh
61.72.Lk
62.20.Hg
Opis:
We use 3D discrete dislocation dynamics technique to study a low-angle tilt boundary migration subjected to applied shear stress at high temperatures, where diffusion significantly contributes to the dislocation motion. The model considers Peach-Koehler forces due to interactions between individual straight dislocation segments. The model also addresses dislocation plasticity in a field of impenetrable incoherent spherical precipitates. Velocities of the individual dislocation segments are calculated in relation to the crystallography of the material. Several calculation series have been carried out for different velocity and driving force relations. The results show that there exists a critical applied shear stress, below which the low angle dislocation boundary cannot surpass the rigid precipitates and remains in an equilibrium configuration. This agrees with experimental results obtained in creep tests of dispersion strengthened alloys. The critical stresses have been calculated also for situations where the applied stress was decreased during the interaction between the low-angle tilt boundary and the precipitates.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 654-656
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photostriction of CdF$\text{}_{2}$:In Crystals
Autorzy:
Suchocki, A.
Raułuszkiewicz, J.
Langer, J. M.
Koziarska-Glinka, B.
Powiązania:
https://bibliotekanauki.pl/articles/1968426.pdf
Data publikacji:
1997-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
61.72.Hh
74.62.Dh
Opis:
Lattice relaxation accompanying phototransformation of In bistable centers from the ground, deep state to the shallow state in CdF$\text{}_{2}$ crystal has been measured with the use of scanning tunnelling microscope. It is shown that relatively small macroscopic changes of the crystal length in the order of 1.8×10$\text{}^{-6}$ accompany the phototransformation of In ions. Lattice expansion upon the influence of population of shallow donor levels in CdF$\text{}_{2}$ explains the observed small changes of lattice constant during the process.
Źródło:
Acta Physica Polonica A; 1997, 92, 5; 1005-1008
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Crystallographic Orientation Changes during Deformation of Magnesium Single Crystals
Autorzy:
Sułkowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/1205235.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Hh
61.50.-f
81.10.Aj
61.50.Ah
81.40.Ef
Opis:
Magnesium single crystals of three different orientations were deformed by tension at room temperature to investigate the geometrical criterion resulting from the Schmid law for activation of basal and non-basal slip systems. Changes of crystallographic orientations of investigated single crystals were systematically measured during deformation and the geometrical criterion was examined in respect to the changes of crystallographic orientations during deformation. The geometrical criterion itself failed to explain lack of activity of non-basal slip systems in the deformed magnesium single crystals. Therefore the ratio of activation volumes of soft to hard slip systems is considered to be introduced for a better understanding of the deformation in hcp metals.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 768-771
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescence of $Cu^{+}$ and $Cu^{2+}$ Ions in CsBr Crystals
Autorzy:
Zorenko, Y.
Voznyak, T.
Turchak, R.
Powiązania:
https://bibliotekanauki.pl/articles/1550555.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Hh
76.30.Kg
76.30.Lh
76.70.Dx
Opis:
The luminescence of $Cu^{+}$ and $Cu^{2+}$ ions in CsBr:Cu and CsBr:$CuBr_{2}$ crystals, respectively, is investigated under excitation by synchrotron radiation in the CsBr fundamental absorption range at 10 K and 300 K. The existence of the luminescence bands of different origin: (i) the intrinsic radiative transition of $Cu^{+}$ ions in the bands peaked at 2.61 eV and 2.23 eV, (ii) the recombination luminescence of $Cu^{2+}$ ions in the bands peaked at 2.55 eV and 2.13 eV, (iii) the luminescence of excitons localized around $Cu^{+}$ and $Cu^{2+}$ ions in the band peaked at 3.08 eV and 3.38 eV, respectively, was found in CsBr:Cu and CsBr:$CuBr_{2}$ crystals. The energies of creation of exciton localized around $Cu^{+}$ and $Cu^{2+}$ ions (6.06 eV and 6.09 eV, respectively, at 10 K) and excitons bound with these ions (5.83 eV and 5.99 eV at 300 K) were determined as well.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 199-202
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoluminescence and Photoconductivity Dynamics in Semi-Insulating Epitaxial GaN Layers
Autorzy:
Gaubas, E.
Juršėnas, S.
Kazlauskas, K.
Miasojedovas, S.
Vaitkus, J.
Žukauskas, A.
Powiązania:
https://bibliotekanauki.pl/articles/2041731.pdf
Data publikacji:
2005-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Hh
72.40.+w
Opis:
The transients of fast free-carrier recombination and of multi-trapping processes due to different species of defects have been investigated by photoluminescence and by contact and microwave photoconductivity. Three distinct stages of relaxation, namely, of stimulated emission, of recombination due to point defects and capture into trapping centers associated with dislocations, and a non-exponential stage with a stretched-exponent asymptotic decay ascribed to dislocations mediated multi-trapping were distinguished by correlated examination of time-resolved photoluminescence and photoconductivity transients.
Źródło:
Acta Physica Polonica A; 2005, 107, 1; 215-219
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strain-dependent damping of Ti-10V-2Fe-3Al at room temperature
Autorzy:
Göken, J.
Fayed, S.
Skubisz, P.
Powiązania:
https://bibliotekanauki.pl/articles/1058185.pdf
Data publikacji:
2016-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Hh
43.40.Cw
43.58.Fm
Opis:
The Ti-10V-2Fe-3Al alloy is advantageous over other titanium grades due to its high tensile strength and its high resistance against creep, cracking, and corrosion. The investigated alloy was hammer-forged inducing high strain rates in the material at a temperature of 800°C and underwent different cooling procedures. Three in that way thermomechanically treated specimens were prepared for subsequent study of the vibration behaviour of the material with the help of non-destructive, contact-free acoustic measurements. Resulting time-dependent decaying acoustic signals were analysed to investigate the dependence of the material damping behaviour on the individual downstream thermal treatment procedure and, ultimately, on the microstructural changes.
Źródło:
Acta Physica Polonica A; 2016, 130, 6; 1352-1357
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Band Gap Characterization of Ternary $BBi_{1-x}N_{x}$ Alloys: A First-Principles Study
Autorzy:
Yalcin, B.
Powiązania:
https://bibliotekanauki.pl/articles/1402512.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Ak
71.15.Mb
03.75.Hh
71.90.+q
Opis:
III-V based alloys and heterostructures have got much attention due to their great device applications as well as for the development of electronic, optic and optoelectronic devices. Because of this reason, the present study reports an investigation about the band gap properties of $BBi_{1-x}N_{x}$ (0 ≤ x ≤ 1) ternary alloy in zinc-blende phase. The results of studied binary (BN and BBi) and ternary $BBi_{1-x}N_{x}$ alloy structures are presented by means of density functional theory within the Wu-Cohen exchange correlation potential based on generalized gradient approximation. We have implemented geometric optimization before the volume optimization calculations for all studied alloys structure. The obtained equilibrium lattice constants of studied binary compounds are in coincidence with experimental works. The band gap character (direct/indirect or negative) of ternary $BBi_{1-x}N_{x}$ alloys is also investigated.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-46-B-48
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Electronic Properties of Ternary $Al_x In_{1-x}P$ Alloys
Autorzy:
Bagci, S.
Yalcin, B.
Powiązania:
https://bibliotekanauki.pl/articles/1402552.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Ak
71.15.Mb
03.75.Hh
71.90.+q
Opis:
III-V based alloys and heterostructures have much attention due to their great device applications as well as for the development of electronic, optic and optoelectronic devices. Because of this reason, the present study reports an investigation of the structural optimization of ternary alloys $Al_x In_{1-x}P$. Method of WIEN2k code is applied considering Wu-Cohen correlation energy functional based on density functional theory. We have constructed 1× 1× 1 supercell containing 8 atoms in zinc-blende structure. For all studied alloys structure, we have implemented geometric optimization before the volume optimization calculations. In this work, the structural and electronic properties of ternary alloys $Al_x In_{1-x}P$ are presented. The obtained equilibrium lattice constants of studied binary compounds are more compatible with experimental data compared to standard semilocal (LDA-PBE) calculations.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-97-B-99
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D Discrete Dislocation Dynamics Applied to Interactions between Dislocation Walls and Particles
Autorzy:
Záležák, T.
Dlouhý, A.
Powiązania:
https://bibliotekanauki.pl/articles/1418435.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
61.72.Hh
61.72.Lk
62.20.Hg
Opis:
A 3D discrete dislocation dynamics model is presented that describes dislocation processes in crystals subjected to mechanical loadings at high temperatures. Smooth and curved dislocations are approximated by a set of short straight line segments. A Peach-Koehler force acting upon each segment involves all segment-to-segment interactions and externally applied stress. The segment velocity is a product of a corresponding mobility and the glide or climb component of the Peach-Koehler force. The model addresses interactions between dislocations and rigid spherical precipitates. A migration of low angle tilt boundaries situated in a field of precipitates is simulated as an example. The numerical implementation exploits symmetries of the model that yield an optimized and highly efficient numerical code. Results provide detailed insight into how dislocation arrangements surmount particle fields in 3D crystals.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 450-452
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Work Hardening of Magnesium Single Crystals Deformed to Stage~B at Room Temperature
Autorzy:
Sułkowski, B.
Mikułowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/1418524.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Ef
61.72.Ff
61.72.Hh
61.72.Lk
Opis:
Magnesium single crystals of purity (99.8 wt%) deformed to stage B on the work-hardening curve at the temperature of 293 K and at a strain rate of $10^{-3} s^{-1}$ were investigated. The modified Bridgman method was used to obtain the crystals of the preferred orientation of (0001)〈$11\overline{2}0$〉 as primary slip system. By using the method based on the experimental gradient matrix, the activity of slip systems was obtained in magnesium single crystals deformed to shear strain 1.2 γ, where well developed stage B of work hardening was observed. It was shown that primary (0001)〈$11\overline{2}0$〉 slip system was dominant in the whole investigated range of the examined deformation. The observation and analysis of etch pits on the {$\overline{1}2\overline{1}0$} plane showed the heterogeneous distribution of dislocations formed during deformation into walls of dislocations perpendicular to the (0001) slip plane. The suggested model of work hardening of magnesium single crystals, which is worth taking into consideration, shows the influence of the long-range stress field derivating from the groups of dislocations arranged in dislocation walls.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 528-531
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of boldenone undecylenate on growth performance, maintenance behaviour, reproductive hormones and carcass traits of growing rabbits
Autorzy:
Mohammed, H.H.
Badawi, M.E.
El-Tarabany, M.S.
Rania, M.
Powiązania:
https://bibliotekanauki.pl/articles/32097.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The present study was done to evaluate the effect of boldenone undecylenate (BOL) on growth performance, maintenance behaviour, reproductive hormones and carcass traits of male rabbits. Sixty apparently healthy New Zealand White male rabbits, 5 weeks of age, were allotted to 3 equal groups. Each group was subdivided into 5 replicates, where the first group is control. The second group (B1) comprised rabbits that received 2 intramuscular injections of BOL (5 mg/kg) with 3 week intervals (9 and 12 weeks of age), while the third group (B2) included rabbits that received 3 intramuscular injections of BOL (5 mg/kg) with 2 week intervals (8, 10 and 12 weeks of age). The end of the trial was after 4 weeks from the last injection (16 weeks of age). The results revealed that the treated groups had a significant increase in total body weight, daily gain and feed efficiency, with a significant decrease in feed conversion ratio (FCR). Ingestive, locomotion and grooming behaviors were significantly higher in treated groups. Lateral pasture and exploratory behaviors were significantly higher in the control group. Administration of BOL resulted in a significant increase in dressing % and a significant decrease in testes %. Groups treated with BOL had a significantly (P<0.05) decreased serum testosterone level, simultaneously with a significantly increased estradiol level. The results indicate that BOL improves performance and carcass traits. Furthermore, there are hormonal-behavioral correlations through enhancement of ingestive and locomotion behaviors of treated animals.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of long-term liming on aggregate stability of a loess-derived soil
Autorzy:
Becher, H.H.
Powiązania:
https://bibliotekanauki.pl/articles/26627.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
Bavaria
soil
settlement
surface sealing
loess
loess-derived soil
liming
aggregate stability
meliorative effect
Źródło:
International Agrophysics; 2001, 15, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initiation and origin of stigma-like structures [SLS] on ovary and style explants of saffron in tissue culture
Autorzy:
Namin, M H
Ebrahimzadeh, H.
Ghareyazie, B.
Radjabian, T.
Namin, H.H.
Powiązania:
https://bibliotekanauki.pl/articles/19761.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Saffron, made from the dried stigmas of Crocus sativus L., contains pigments and valuable aromatic compounds, and can be used in medicine and as a spice. Nowadays its production is lower than demand. Tissue culture presents an alternative biochemical tool which can be used to produce stigma-like structure (SLS) in vitro. In this study, the origin and induction of SLS formation was investigated in ovary and style explants of floral buds on MS medium supplemented with 1-naphthalene acetic acid (NAA) and 6-benzlaminopurine (BAP). SLS were directly originated through meristematic cells or indirectly in the form of colorless globular structures from parenchyma tissue. The colorless globular structures initially were conical and pale yellow color at the sharp ends; subsequently they matured into trumpet-like red stigmas with or without finger-like papillae at the margins. Light and electron microscopic observations of ultra- and semithin sections of different developmental stages of SLS showed that these structures possess two kinds of cells: (1) small cells close to parenchyma tissues and (2) large cells oriented towards the peripheral area and apparently originated from the small ones. Our results suggest that the SLS originated from internal parenchyma tissues.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2010, 52, 1; 55-60
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emotional Analysis of Blogs and Forums Data
Autorzy:
Weroński, P.
Sienkiewicz, J.
Paltoglou, G.
Buckley, K.
Thelwall, M.
Hołyst, J.
Powiązania:
https://bibliotekanauki.pl/articles/1408915.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.50.-r
07.05.Hd
89.20.Hh
89.70.Cf
Opis:
We perform a statistical analysis of emotionally annotated comments in two large online datasets, examining chains of consecutive posts in the discussions. Using comparisons with randomised data we show that there is a high level of correlation for the emotional content of messages.
Źródło:
Acta Physica Polonica A; 2012, 121, 2B; B-128-B-132
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical Analysis of Emotions and Opinions at Digg Website
Autorzy:
Pohorecki, P.
Sienkiewicz, J.
Mitrović, M.
Paltoglou, G.
Hołyst, J.
Powiązania:
https://bibliotekanauki.pl/articles/1400182.pdf
Data publikacji:
2013-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.50.-r
07.05.Hd
89.20.Hh
89.70.Cf
Opis:
We performed statistical analysis on data from the Digg.com website, which enables its users to express their opinion on news stories by taking part in forum-like discussions as well as to directly evaluate previous posts and stories by assigning so called "diggs". Owing to fact that the content of each post has been annotated with its emotional value, apart from the strictly structural properties, the study also includes an analysis of the average emotional response of the comments about the main story. While analysing correlations at the story level, an interesting relationship between the number of diggs and the number of comments that a story received was found. The correlation between the two quantities is high for data where small threads dominate and consistently decreases for longer threads. However, while the correlation of the number of diggs and the average emotional response tends to grow for longer threads, correlations between numbers of comments and the average emotional response are almost zero. We also suggest presence of two different mechanisms governing the evolution of the discussion and, consequently, its length.
Źródło:
Acta Physica Polonica A; 2013, 123, 3; 604-615
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of Emotional Variables in the Classification and Prediction of Collective Social Dynamics
Autorzy:
Chołoniewski, J.
Sienkiewicz, J.
Hołyst, J.
Thelwall, M.
Powiązania:
https://bibliotekanauki.pl/articles/1388316.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.50.-r
07.05.Hd
89.20.Hh
Opis:
We demonstrate the power of data mining techniques for the analysis of collective social dynamics within British Tweets during the Olympic Games 2012. The classification accuracy of online activities related to the successes of British athletes significantly improved when emotional components of tweets were taken into account, but employing emotional variables for activity prediction decreased the classifiers' quality. The approach could be easily adopted for any prediction or classification study with a set of problem-specific variables.
Źródło:
Acta Physica Polonica A; 2015, 127, 3A; A-21-A-28
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the change of accompanying cation of mineral nitrogen fertilizers on soil physical properties
Autorzy:
Becher, H.H.
Powiązania:
https://bibliotekanauki.pl/articles/24328.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
sodium content
nitrogen fertilizer
physical property
salt concentration
soil
loamy soil
structural property
Źródło:
International Agrophysics; 2005, 19, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Residual Stresses on the Coercive Field Strength of Drawn Wires
Autorzy:
Suliga, M.
Kruzel, R.
Chwastek, K.
Jakubas, A.
Pawlik, P.
Powiązania:
https://bibliotekanauki.pl/articles/1030254.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Hh
75.60.-d
75.60.Ej
Opis:
Residual stresses occurring in drawn wires due to technological process affect their quality, which in turn may have a substantial impact on safety of use and "life" of ready-made products. Measurements of magnetic properties of the wires like coercive field strength may be useful for monitoring the level of residual stresses. The present paper examines the relationship between the drawing speed and the coercive field strength in high carbon wires. It has been found that for drawing speeds not exceeding 20 m/s the coercive field strength is proportional to residual stresses on wire surface.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1114-1116
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical Model of the Pulmonary Circulation Designed for Investigation on Cardiac Output Measurement by Means of the Thermodilution Method
Autorzy:
Gawlikowski, M.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/1493354.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.19.Hh
47.63.Ec
82.60.Fa
Opis:
The "gold clinical standard" of cardiac output measurements is the thermodilution method, implemented by the Swan-Ganz catheter. The unreliability of obtained results is difficult to estimate experimentally, due to the lack of reference methods or the risk of serious interferences in the measured object. Moreover, the pulsating blood flow produced by the heart is difficult to measure. Therefore it is advisable to develop the physical model of the pulmonary circulation, designed to investigate the accuracy of cardiac output measurements by means of the thermodilution method.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 798-802
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neutron Diffraction Study and Deformation Behavior of a Composite Based Mg Alloy Reinforced by Short Saffil Fibers
Autorzy:
Farkas, G.
Máthis, K.
Pilch, J.
Powiązania:
https://bibliotekanauki.pl/articles/1402148.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.Bx
88.30.mj
61.72.Hh
Opis:
In the present work neutron diffraction has been applied for ex situ investigation of residual stresses in Mg-4%Al-1%Ca (AX41) magnesium alloy reinforced with short Saffil fibers. Samples were deformed in compression at room temperature. Two types of fiber arrangement were investigated. In both samples the fibers were homogeneously distributed and arranged in parallel planes with a random fiber orientation. In the first sample these planes were parallel with the loading axis and in the second one they were perpendicular to the loading direction. Significant dependence of both the mechanical properties and residual strains on the fibers orientation was observed. Sample with parallel fiber arrangement showed higher hardness and lower ductility. Further the increment of residual tensile lattice strain in the matrix with a macroscopic deformation is much higher than in the other case. It was found that the residual strain evolution strongly depends on the orientation of grains in the matrix.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 758-761
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Spin Resonance Spectra of Fe$\text{}^{3+}$ Ions in SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ High-T$\text{}_{c}$ Substrates
Autorzy:
Jabłoński, R.
Pajączkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1964358.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.-v
61.72.Hh
Opis:
New results concerning paramagnetic defects in SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ high-T$\text{}_{c}$ substrates connected with unavoidable impurity Fe$\text{}^{3+}$ are reported. The identification was checked by measuring the spectra in SrLaAlO$\text{}_{4}$ crystals intentionally doped with 0.5 at.% Fe. Angular dependences of three lines were distinguished at X-band frequency in the temperature range from 4 K to 300 K. We attribute these lines to the transitions inside the doublets ±1/2, and "forbidden" doublets ±3/2, ±5/2, respectively. By diagonalization of spin-Hamiltonian, parameters |D| > 1.2 cm$\text{}^{-1}$, |E| ≈ 0.1 cm$\text{}^{-1}$ and g$\text{}_{x}$=g$\text{}_{y}$=g$\text{}_{z}$= 1.987(13) for SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ were calculated and within the margin of error they were of the same value.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 173-176
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adopting adequate leaching requirement for practical response models of basil to salinity
Autorzy:
Babazadeh, H.
Tabrizi, M.S.
Darvishi, H.H.
Powiązania:
https://bibliotekanauki.pl/articles/24673.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
irrigation water
mathematical model
plant response
root zone
basil
salinity
threshold value
Źródło:
International Agrophysics; 2016, 30, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Studies of Tunnel Magnetoresistance and Shot Noise in a Schottky-Barrier Carbon Nanotube Transistor with Ferromagnetic Contacts
Autorzy:
Krompiewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1813866.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.75.Hh
75.47.De
42.50.Lc
73.63.Fg
Opis:
A Schottky-barrier carbon nanotube field-effect transistor with ferromagnetic contacts was modelled. The theoretical method combines a tight-binding model and the non-equilibrium Green function technique. Tunnel magnetoresistance as well as current noise of the carbon nanotube field-effect transistor are the main issues addressed in this study. It is shown that the former may exceed 50%, whereas the latter is characterized by the Poissonian Fano factor (F) within the sub-threshold region, and the sub-Poissonian F≈0.5 for elevated gate voltages. Remarkably, reorientation of relative magnetization alignments of the contacts may lead to noticeable changes in the current noise.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 521-524
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Głos przestrogi : we współczesnym świecie terrorysta może dysponować groźną bronią masowego rażenia. Przed zamachami nie sposób ochronić całego społeczeństwa
Autorzy:
Jenkins, Simon.
Powiązania:
Forum 2001, nr 39/40, s. 4
Współwytwórcy:
(hh). Tłumaczenie
Data publikacji:
2001
Tematy:
Atak terrorystyczny USA
Terroryzm USA
Terroryzm zwalczanie strategia USA
Opis:
Tł. art. zamieszcz. w "The Times". --- 2001, 12 IX.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Quantitative Model of the Surface Relief Formation in Cyclic Straining
Autorzy:
Polák, J.
Man, J.
Powiązania:
https://bibliotekanauki.pl/articles/1177391.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.me
81.05.Bx
61.72.Ff
61.72.Hh
61.72.Lk
61.72.J-
Opis:
The cyclic strain localization in crystalline materials subjected to cyclic loading results in specific dislocation arrangement in persistent slip bands consisting of alternating dislocation rich and dislocation poor volumes. In the present model the interaction of mobile dislocations in persistent slip band leading to the formation of point defects during cyclic straining is considered. Point defects are steadily produced and simultaneously annihilated due to localized cyclic straining. The non-equilibrium point defects migrate to the matrix and result in transfer of matter between persistent slip band and the matrix and formation of the internal stresses both in the persistent slip band and in the matrix. Plastic relaxation of internal stresses leads to the formation of the characteristic surface relief in the form of persistent slip markings (extrusions and intrusions). Process of point defect migration is quantitatively described and the form of extrusion and parallel intrusions is predicted under some simplifying assumptions. The predictions of the model are discussed and predicted surface relief is compared with selected observations of surface relief produced by cyclic straining.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 675-680
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Band Gap Calculations of Ternary $InN_{0.03125}P_{0.96875}$ Alloy
Autorzy:
Ustundag, M.
Yalcin, B.
Bagci, S.
Aslan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1401943.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Ak
71.15.Mb
03.75.Hh
71.90.+q
Opis:
In the current study, structural and electronic properties of ternary dilute nitride $InN_{x}P_{1-x}$ alloys have been investigated by using density functional theory. The equilibrium lattice parameter of studied material has been calculated in zinc-blende phase. 2× 2× 2 supercell with 64 atoms has been used for calculations. The lattice parameter of $InN_{0.03125}P_{0.96875}$ alloy is found to be 5.852 Å. By means of the equilibrium lattice parameter, electronic band structure has been calculated for dilute 3.125% nitride composition. It is found that a ternary $InN_{0.03125}P_{0.96875}$ alloy is a direct band gap semiconductor with energy band gap of 1.198 eV.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-135-B-137
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Milczenie i kłamstwa : zubożona prawda
Autorzy:
Fisk, Robert (1946-2020).
Powiązania:
Forum 2001, nr 5, s. 10-11
Współwytwórcy:
(hh). Tłumaczenie
Data publikacji:
2001
Tematy:
Pociski przeciwpancerne zastosowanie Stany Zjednoczone Jugosławia 1999 r.
Interwencja zbrojna 1999 r. w Jugosławii NATO
Amunicja uranowa zastosowanie NATO Jugosławia 1999 r.
Opis:
Tł. art. zamieszcz. w "The Independent". --- 2001, 8 I.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Zamach na honor niemieckiego żołnierza
Autorzy:
Augstein, Rudoff.
Powiązania:
Forum 1997, nr 3, s. 6-8
Współwytwórcy:
(hh). Tłumaczenie
Data publikacji:
1997
Tematy:
Wojna 1939-1945 r. przestępstwo wojenne Niemcy wystawy
Przestępstwo wojenne Niemcy 1939-1945 r. wystawy
Wojsko przestępstwo wojenne Niemcy 1933-1945 r.
Wystawiennictwo Niemcy
Opis:
Dot. m. in. wystawy "Wojna na wyniszczenie. Zbrodnie Wehrmahtu 1941-1944 r.".
Tł. art. zamieszcz. w "Der Spiegel". --- 1997, 10 III.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Najwyższy stopień zdziczenia : wybitni intelektualiści, pisarz Mario Vargas Llosa i Noam Chomsky, zabrali głos na temat obecnej fazy bliskowschodniego kryzysu
Autorzy:
Chomsky, Noam.
Powiązania:
Forum 2001, nr 37, s. 8-9
Współwytwórcy:
(hh). Tłumaczenie
Data publikacji:
2001
Tematy:
Konflikt palestyńsko-izraelski
Opis:
Rys.; Tł. art. zamieszcz. w "Los Angeles Times". --- 2001, 13 VIII.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Effect of creep on crystallographic orientation in single crystal superalloy
Autorzy:
Albrecht, R.
Rak, J.
Bogdanowicz, W.
Gancarczyk, K.
Sieniawski, J.
Kubiak, K.
Lelątko, J.
Powiązania:
https://bibliotekanauki.pl/articles/1075665.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
81.10.Aj
61.72.Hh
Opis:
The creep-rupture tests were performed on a single crystal rods made of CMSX-4 superalloy obtained at withdrawal rates of 3 and 5 mm/min. After the rupture the microstructure and fracture surface were examined and correlated with X-ray crystal rotation measurements by the Ω-scan method. The conclusions about the crystal lattice rotation during creep test were provided.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1094-1096
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioactive compounds, antibacterial and antifungal activities of two Cirsium species
Autorzy:
Gulen, D.
Sabudak, T.
Orak, H.H.
Caliskan, H.
Ozer, M.
Powiązania:
https://bibliotekanauki.pl/articles/12307832.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
Asteraceae
Cirsium
Cirsium creticum
Cirsium italicum
hexane extract
antibacterial action
antifungal activity
Opis:
In the GC-MS analysis, 81 bioactive phytochemical compounds were identified in hexane extracts of Cirsium creticum and Cirsium italicum. Terpenoids constituted the main fractions of C. italicum (70.95%), while hydrocarbons were most abundant compounds of C. creticum (41.11%). The antibacterial activity and antifungal activity of extracts from two Cirsium species was tested using microdilution methods. According to the results of antibacterial activity, the highest inhibition effect of C. creticum was found on B. subtilis, E. coli and P. aeruginosa. The highest inhibition effect of C. italicum was found on B. subtilis. In the results of antifungal activity, the highest inhibition effect of C. creticum was found on P. chrysogenum and the highest inhibition effect of C. italicum was found on C. krusei. The present work is the first report on hexane extracts compounds of two Cirsium species as well as antibacterial and antifungal activities.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 5; 213-221
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pretensje do wuja Sama : euroatlantyckie przetasowania
Autorzy:
Markovits, Andrei.
Powiązania:
Forum 1999, nr 28, s. 8
Współwytwórcy:
Hogrefe, Jürgen. Opracowanie
Schumacher, Hajo. Opracowanie
(hh). Tłumaczenie
Data publikacji:
1999
Tematy:
NATO a Europa polityka
Interwencja zbrojna 1999 r. w Jugosławii polityka
Bezpieczeństwo międzynarodowe polityka Europa
Opis:
Tł. art. zamieszcz. w: "Der Spiegel". --- 1999, 21 VI.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Effect of Winter Cover Crop Biomass on Summer Weed Emergence and Biomass Production
Autorzy:
Bittencourt, H.H.
Lovato, P.E.
Comin, J.J.
Lana, M.A.
Altieri, M.A.
Costa, M.D.
Gomes, J.C.
Powiązania:
https://bibliotekanauki.pl/articles/65024.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
A greenhouse assay was carried out to evaluate the effect of winter cover crop residues on spontaneous plants that commonly occur on summer annual fields in Southern Brazil. Dry shoot residues of rye (Secale cereale), vetch (Vicia villosa), fodder radish (Raphanus sativus), and a mix of the three species, were applied over pots that had been seeded with alexandergrass (Brachiaria plantaginea), hairy beggarticks (Bidens pilosa), wild poinsettia (Euphorbia heterophylla), and morning glory (Ipomoea grandifolia) at four different depths (0, 1, 2, or 4 cm). Plant emergence and biomass production were measured. Residues of rye reduced the emergence of B. plantaginea, while vetch diminished I. grandifolia and B. plantaginea emergence. Fodder radish reduced emergence of I. grandifolia. The mix of cover crops reduced emergence of I. grandifolia, B. plantaginea, and B. pilosa. None of the cover crops differed from the control on E. heterophylla emergence. The lowest yields in spontaneous plant shoot biomass were obtained from the cover with rye + vetch + fodder radish. The lowest values of root biomass occurred under cover with rye, fodder radish or the mix. Use of vetch residues decreased emergence of B. plantaginea and I. grandifolia, but enhanced biomass accumulation by the latter.
Źródło:
Journal of Plant Protection Research; 2013, 53, 3
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trzy godziny z Himmlerem : zdaniem krytyków niezwykłe wrażenie robi film, stanowiący ekranizację jednej tylko mowy Himmlera
Autorzy:
Ehlert, Matthias.
Powiązania:
Forum 2000, nr 12, s. 22-23
Współwytwórcy:
(hh). Tłumaczenie
Data publikacji:
2000
Tematy:
Himmler, Heinrich (1900-1945)
Himmler Heinrich (1900-1945) film
Mowy niemieckie 1943 r. film
Opis:
Dot. filmu "Das Himmler-Project" w reżyserii Karmakara, w którym odtworzone zostało tajne przemówienie Heinricha Himmlera do kadry oficerskiej SS 4 października 1943 r. w Poznaniu.
Tł. art. zamieszcz. w "Frankfurter Allgemeine Zeitung". --- 2000, 22 II.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Antyrakietowy ból głowy : prezydent Clinton nie chce odroczyć podjęcia decyzji w sprawie programu antyrakietowego
Autorzy:
Hackworth, David.
Powiązania:
Forum 2000, nr 11, s. 9
Współwytwórcy:
(hh). Tłumaczenie
Data publikacji:
2000
Tematy:
Handel bronią Stany Zjednoczone od 1989 r.
Obrona przeciwrakietowa Stany Zjednoczone
Przemysł zbrojeniowy
Opis:
Tł. art. zamieszcz. w "Worldnetdaily". --- 1999, 14 XII.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Narkotyk samostanowienia : Chorwacja, Kosowo, Kaukaz: mniejszości mają prawo do ochrony, ale nie każdy naród musi mieć swoje państwo
Autorzy:
Thuman, Michael.
Powiązania:
Forum 1999, nr 40, s. 14
Współwytwórcy:
(ns). Tłumaczenie
(hh). Tłumaczenie
Data publikacji:
1999
Tematy:
Konflikty zbrojne prognozy Europa
Samostanowienie narodów
Bezpieczeństwo międzynarodowe
Opis:
Tł. art. zamieszcz. w "Die Welt". --- 1999, 26 VIII.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Electron Spin Resonance Study of Thermal Defects in SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ High-T$\text{}_{c}$ Substrates
Autorzy:
Jabłoński, R.
Gloubokov, A.
Pajączkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1964356.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.-v
61.72.Hh
61.72.Ji
Opis:
The effect of annealing SrLaAlO$\text{}_{4}$ (SLA) and SrLaGaO$\text{}_{4}$ (SLG) crystals in oxidizing and reducing atmospheres in the temperature range of 950°C-1300°C was investigated. Three kinds of anisotropic defects D$\text{}_{1}$, D$\text{}_{2}$, and E at the temperature range of 4-300 K were found. By diagonalization of orthorhombic spin-Hamiltonian parameters: |D|=0.0541(10) cm$\text{}^{-1}$, |E|=0.0108(10) cm$\text{}^{-1}$, g$\text{}_{∥}$=0.883(5), and g$\text{}_{⊥ }$=1.922(5) for D$\text{}_{1}$ defects for SLG and SLA were calculated and they had the same values within the margin of error.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 169-172
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wojna w Europie : politolodzy Zbigniew Brzeziński i Peter Glotz o międzynarodowych implikacjach zbrojnego konfliktu między NATO a Serbią
Autorzy:
Brzeziński, Zbigniew (1928-2017).
Glotz, Peter.
Powiązania:
Forum 1999, nr 14, s. 2-3
Współwytwórcy:
(zs). Tłumaczenie
(hh). Tłumaczenie
Data publikacji:
1999
Tematy:
Interwencja zbrojna NATO Jugosławia 1999 r.
Opis:
Rys.
Tł. art. zamieszcz. w: "The Wall Street Journal Europe". --- 1999, 25 III.
"Die Woche". --- 1999, 26 III.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Study of an Ultra-Compact, Repetitive Marx Generator for High-Power Microwave Applications
Autorzy:
Bischoff, R.
Charon, R.
Duperoux, J.
Martin, B.
Pinguet, S.
Powiązania:
https://bibliotekanauki.pl/articles/1807853.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.30.Ng
84.32.Hh
84.32.Tt
84.60.Ve
Opis:
The need for repetitive high-power microwave systems, for instance within the scope of convoy protection, requires the availability of compact, repetitive pulsed-power generators. The development and the first experimental results of an upgraded balanced ISL Marx generator for future repetitive operations at pulse repetition frequencies in the order of 100 Hz are introduced. A key objective is to keep the fundamental modular coaxial concept by reason of its scalability and compactness. Simulation models were developed under the PSpice software package in order to investigate the charging and discharging phases of the Marx generator and also to determine the design criteria for repetitive operations. The charging resistors were replaced by ultracompact inductors for rapid charging, being able to withstand pulsed voltages up to 60 kV and pulsed currents up to 1.4 kA during the discharge phase. An improved type of strontium-titanate high-voltage ceramic capacitor was successfully tested experimentally up to 70 kV. Each new elementary stage of the Marx generator consists of eight 1.1 nF sectors of a cylinder capacitors mounted in parallel, two charging inductors of about 17.8 μH and two halves of spherical spark gaps. The pressurized self-triggered gas switches are arranged along the axis for fast consecutive breakdown thanks to the UV radiation emitted during the breakdown in each gap. The stages are installed in individual fibreglass housings. First experimental results of a 4-stage Marx generator in repetitive operation, driven by a 4 kW capacitor charging power supply up to a maximum voltage of 40 kV, are presented.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 964-966
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-100 z 159

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