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Wyświetlanie 1-15 z 27
Tytuł:
Angular Differential Cross-Sections for Electron Transfer in Collisions between Proton and He$\text{}^{+}$(1s) Ions
Autorzy:
Bhattacharyya, S.
Pathak, K.
Becker, A.
Faisal, F. H. M.
Powiązania:
https://bibliotekanauki.pl/articles/1952747.pdf
Data publikacji:
1996-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.70.+e
34.40.+n
Opis:
Angular differential cross-sections for the formation of H, as a result of electron capture by proton from He$\text{}^{+}$(1s) at the centre-of-mass energies from 4 to 24 keV, are calculated using distorted wave Coulomb-Born approximation. The total interaction potentials in the prior-interaction channel and in the post-interaction channel are considered. Coulomb boundary conditions are taken care of with the proper choice of the perturbation potentials in both the prior and the post channels. A prior-post discrepancy is noted. Existing theoretical results are presented along with the present results.
Źródło:
Acta Physica Polonica A; 1996, 90, 6; 1143-1153
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties and Microstructure of InGaN Grown by Molecular Beam Epitaxy
Autorzy:
Böttcher, T.
Einfeldt, S.
Figge, S.
Kirchner, V.
Hommel, D.
Selke, H.
Ryder, P. L.
Bertram, F.
Riemann, T.
Christen, J.
Lunz, U.
Becker, C. R.
Powiązania:
https://bibliotekanauki.pl/articles/1969025.pdf
Data publikacji:
1998-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.Dv
68.65.+g
78.20.-e
78.55.-m
78.55.Cr
Opis:
The luminescence of In$\text{}_{x}$Ga$\text{}_{1-x}$N is studied for thick epitaxial layers and quantum wells. Using spatially resolved cathodoluminescence spectroscopy the commonly observed broad integral photoluminescence spectra were found to result from spectral and lateral inhomogeneous emission across the samples. Moreover, the integral photoluminescence and absorption spectra show different temperature dependences. The effects can be explained assuming fluctuations of the composition associated with a variation of the band gap.
Źródło:
Acta Physica Polonica A; 1998, 94, 2; 260-264
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A software module for quqlity control of CEGRN sites
Autorzy:
Schoenemann, E.
Becker, M.
Gutwald, J.
Powiązania:
https://bibliotekanauki.pl/articles/224491.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
CERGOP
CEGRN
GPS
system pozycjonowania obiektów
stacje trwałe
Central European Regional Geodynamic Project
permanent stations
Opis:
GPS observations are still intluenced by a whole amount of effects, as for example multiple reflections, ionosphere etc. which have an impact on the accuracy of the observables even on carefully selected sites. Up to now these effects can not be mitigated or modelled satisfactorily. Hence the monitoring of these station specific effects is mandatory in order to judge about data quality and derive weighting or deletion schemes for optimal parameter estimation. Within the tasks of the work package 4 of the Central Europe Geodynamics Project (CERGOP), a software tool was developed to monitor the continuously operating reference stations of the network. The development was carried out using C++ libraries available for the most common operating systems. Here we describe the basic features of this package and give an overview of its present status.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 103-109
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of CEGRN 2005 as the eighth of CERGOP observing campaigns
Autorzy:
Hefty, J.
Gerhatova, L.
Stangl, G.
Haslinger, C.
Krauss, S.
Becker, M.
Drescher, R.
Grenerczy, G.
Kratochvil, R.
Liwosz, T.
Powiązania:
https://bibliotekanauki.pl/articles/224554.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
CERGOP
CEGRN
obserwacje geodezyjne
Central European Regional Geodynamic Project
geodetic observation
Opis:
Strategy of analysis and results from solution of CEGRN epoch campaign in 2005 Combined solution of CEGRN 2005 based or individual solutions from six an: centres and its comparison with CEGRN 2003 coordinates. Time evolution of coordinates at some long-term observed CEGRN sites obtained during epoch camp since 1994 and the related problems.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 39-46
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CERGOP-2 Project activities of Bulgaria
Autorzy:
Milev, G.
Vassileva, K.
Becker, M.
Powiązania:
https://bibliotekanauki.pl/articles/224498.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
CERGOP
geodynamika
CEGRN
GPS
system pozycjonowania obiektów
geodynamics
velocity estimations
Opis:
This paper summarizes the recent works with respect to the CERGOP-2 project tasks. The main activity was the implementation of the Working Package "Geodynamics of Balkan Peninsula". Major efforts were taken to the maintenance of the operation of two permanent GPS stations in Bulgaria and to arrange for the data transmission to the CERGOP Data Centre in Graz. The CEGRN GPS campaigns of 2003 and 2005 were analyzed together with additional Balkan Peninsula stations. New results on coordinates and velocities for this Balkan Peninsula subnet of CEGRN are computed and will be presented and discussed. The accomplished works on the monograph "Geodynamics of Balkan Peninsula" with the preparation of the manuscripts and the main content of the findings will be outlined.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 111-118
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geodetic measurements and investigations on the territory of Bulgaria within the CERGOP project
Autorzy:
Milev, G.
Vassileva, K.
Becker, M.
Dimitrov, N.
Powiązania:
https://bibliotekanauki.pl/articles/225781.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
geodynamika
CERGOP
Bułgaria
Półwysep Bałkański
geodynamics
Bulgaria
Balkan Peninsula
Źródło:
Reports on Geodesy; 2006, z. 5/80; 213-220
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GPS velocity field of the Balkan Peninsula
Autorzy:
Vassileva, K.
Becker, M.
Powiązania:
https://bibliotekanauki.pl/articles/225444.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
sieci GPS
geodynamika
Półwysep Bałkański
GPS networks
geodynamics
Balkan Peninsula
Źródło:
Reports on Geodesy; 2006, z. 5/80; 549-563
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary Central European intraplate velocities from CEGRN campaigns 1994 to 2005
Autorzy:
Drescher, R.
Becker, M.
Schoenemann, E.
Powiązania:
https://bibliotekanauki.pl/articles/224551.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
CERGOP
CEGRN
prędkości poziome
Central European Regional Geodynamic Project
velocity estimations
horizontal velocities
Opis:
Within the Central Europe Regional Geodynamics Project (CERGOP) for the establishment of a high precision reference frame CEGRN (Central European GPS Geodynamic Reference Network) eight GPS campaign solutions since 1994 are available for velocity estimation. They were used to compute preliminary station velocities in the ITRF2000. This paper reports not only on the results and some comparisons with former solutions published by the CERGOP group but also on the improved options available for velocity estimation with version 5.0 of Bernese GPS Software.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 47-54
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geokinematics of Central Europe: new insights from CERGOP-2/Environment Project
Autorzy:
Caporali, A.
Becker, M.
Fejes, I.
Gerhatova, L.
Ghitau, D.
Grenerczy, G.
Hefty, J.
Medac, D.
Milev, G.
Mojzes, M.
Mulic, M.
Powiązania:
https://bibliotekanauki.pl/articles/224596.pdf
Data publikacji:
2007
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
GPS
geodezja
geodynamika w Europie Centralnej
tektonika w Europie Centralnej
naprężenia i odształcenia w Europie Środkowej
GPS Geodesy
Central European Geodynamics
Central European Tectonics
Stress and Strain in Central Europe
Opis:
The CERGOP2 project funded by the European Union from 2003 to 2006 under the 5th Framework Programme benefits from repeated measurements of the coordinates of epoch and permanent GPS stations forming the CEGRN network in Central Europe, starting 1994. We report on the results of the systematic processing of the available data up to 2005. The analysis work has yielded the velocities of some 60 sites, covering a variety of Central European tectonic provinces, from the Adria indenter to the Tauern window, the Pannonian basin, the Vrancea Seismic Zone and the Carpathian Mountains. The estimated velocities define kinematical patterns which outline, with varying spatial resolution depending on the station density and history, the present day tectonic flow in Central Europe.The CEGRN data show that the majority of active contraction originating from the Eurasia Nubia plate boundary and the microplate between them is taken up primarily in the Eastern Alps, the Dinarides, and the Pannonian Basin. After removal from the ITRF2000 velocities of a rigid rotation accounting for the mean motion of stable Europe, the residual velocities have random orientations with 0.3 mm/yr scatter. This Iow figure provides an upper estimate for the level of rigidity of the European Platform. A 2.3 mm/yr north-south oriented convergence rate is implied by our data between Adria and the Southern Alps, and a narrow - -60 km wide- contraction zone in the Southern Alps is identified, consistently with earlier results. An eastward extrusion north of the contraction zone corresponds with the extension of the Tauern Window. In the southeastern boundary of the microplate, 4-4.5 mm/yr motion of Adria decreases to -1 mm/yr through the microplate, its boundary, and the Dinarides mountain range towards the southwestern part of the Pannonian Basin. Our data suggest that if the Pannonian Basin is subject to deformation, then it is most likely to be compressional than extensional. We conclude that compression and associated contraction due to the Adria collision with the Alps and the Dinarides is likely to fade away in the Western and Northern Carpathians, where our velocities and strain rates show no significant deformation.
Źródło:
Reports on Geodesy; 2007, z. 2/83; 7-46
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reference frame and model improvements in CEGRN
Autorzy:
Drescher, R.
Becker, M.
Powiązania:
https://bibliotekanauki.pl/articles/224606.pdf
Data publikacji:
2007
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
CEGRN
Europa Środkowa
ruchy tektoniczne
system GPS
Central Europe
tectonic activity
GPS system
Opis:
The CEGRN Consortium decided to reprocess all GPS campaigns according new compiled guidelines. In the contribution these guidelines are introduced. Furthermore it was tested, whether they are also suitable for the first campaigns with their paticularities.
Źródło:
Reports on Geodesy; 2007, z. 2/83; 47-54
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Bimetallic Systems with UPS and PAX: Gold on Platinum and Palladium Surfaces
Autorzy:
Moors, M.
Kobiela, T.
Krupski, A.
Becker, C.
Wandelt, K.
Powiązania:
https://bibliotekanauki.pl/articles/1811505.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Bm
73.61.At
71.20.Be
71.20.Eh
71.20.Gj
Opis:
In the present study the thermal behavior of ultrathin Au films deposited on different noble metal single crystal surfaces was studied by means of ultraviolet photoelectron spectroscopy and photoemission of adsorbed xenon. The primary goal of this work was to demonstrate the power of photoemission of adsorbed xenon as an easy to handle and very surface sensitive technique for the characterization of multi-component systems. All investigated systems, Au-Pt(111), Au-Pd(111) and Au-Pd(110) show a particular dependence of their electronic and structural properties on the annealing temperature. Au multilayer films with a thickness of 3 monolayer prepared at 150 K undergo in all cases a smoothening by annealing up to room temperature. While on Pd this effect is mainly detectable on the topmost atomic layer the ordering process on Pt is also affecting the deeper layers. Further annealing of the Au-Pd system to 450 K and the Au-Pt system to 750 K, respectively, results in the onset of the alloying process at the interface between metal film and substrate. After annealing to 650 and 950 K, respectively, the alloying finally extends to the very surface. The complete loss of Au from the surface can be detected at 1050 K on Pd and at 1150 K on Pt. The orientation of the substrate has only a weak influence, showing up e.g. in additional electronic states of the not alloyed Au-Pd(111) and Au-Pd(111) systems. Adsorption of CO as a probe molecule illustrates the formation of different adsorption sites on the bimetallic systems during the Au diffusion process.
Źródło:
Acta Physica Polonica A; 2008, 114, S; S-77-S-92
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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