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Wyświetlanie 1-15 z 307
Tytuł:
„NUKAT – Autostrada informacji cyfrowej”. Realizacja projektu w Bibliotece Jagiellońskiej
“NUKAT – the Highway of Digital Information”. The Execution of this Project in the Jagiellonian Library
Autorzy:
Wielek-Konopka, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/570973.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Jagielloński. Biblioteka Jagiellońska
Tematy:
highway of digital information
merging data
computer catalogues
NUKAT
UWL
JL
KKZBUJ
CCJULC (Computer Catalogue of the Jagiellonian University Libraries Collections)
Autostrada Informacji Cyfrowej
scalanie
katalogi komputerowe
BUW
BJ
Opis:
This article attempts to sum up the research conducted in the Jagiellonian Library in connection with its participation in the project entitled “NUKAT – The Highway of Digital Information”, executed between 2009 and 2012 by the University Library in Warsaw. Besides introducing the concepts, the general premises of the project and the mandatory procedures as well as presenting particular stages of merging data, this article also describes the process of merging the Computer Catalogue of the Collections of the Jagiellonian University Libraries Collections with the National Union Catalogue NUKAT, including the preliminary, administrative and follow-up work that was done in the Jagiellonian Library in connection with this enterprise. The aim of this article is to give a broad outline of this project as well as to present the results of an analysis performed on a control group of 5500 merged records in connection with some abnormalities that had been detected. This analysis was done on the basis of reports additionally prepared by the NUKAT Centre at the request of the Jagiellonian Library during the course of the project as well as after particular stages of merging catalogues were finished. The article is summed up by the conclusions and the evaluation of the project which are based on the control material and on the data gathered by the author while she was coordinating the project.
Źródło:
Biuletyn Biblioteki Jagiellońskiej; 2012, 62; 155-165
0006-3940
2450-0410
Pojawia się w:
Biuletyn Biblioteki Jagiellońskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
"Ridge" Fermi Surface Study in Metallic (R)Ba$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ (R = Y, Dy) and in Oxygen Deficient YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ by Positron Annihilation
Autorzy:
Hoffmann, L.
Manuel, Α. A.
Barbiellini, B.
Peter, Μ.
Shukla, A.
Walker, E.
Powiązania:
https://bibliotekanauki.pl/articles/1933509.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.Jt
74.72.Βk
71.25.Ηc
78.70.Bj
Opis:
We present a detailed positron 2D-ACAR measurements study of the "ridge" Fermi surface of (R)Ba$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ (R = Y, Dy) compared to full-potential linearized augmented plane wave and linear muffin-tin orbital calculations. From different 2D-ACAR projections measured in DyBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$, a 3D model of the momentum density of the ridge was established and is in good agreement with LMTO calculations of YΒa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$, confirming the description of the ridge Fermi surface by local density approximation calculations. The ridge is also studied in oxygen deficient YΒa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$. With growing δ, the ridge disappears without changing in width. This is consistent with full-potential linearized augmented plane wave calculations of YΒa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{6.5}$, and supports the phase separation model of Mesot et al.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 147-161
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
2D Angular Correlation of Annihilation Radiation: Current Trends and Future Possibilities
Autorzy:
West, R. N.
Powiązania:
https://bibliotekanauki.pl/articles/1933550.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.28.+d
71.25.Ηc
78.70.Bj
Opis:
Recent improvements in two-dimensional angular correlation measurement and analysis techniques have greatly increased the power of the method to image the Fermi surfaces of electronically complex systems. That, and the further and dramatic improvement that must result when the present radioisotope positron sources are replaced by intense monoenergetic positron beams are discussed and illustrated.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 249-256
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
2×2 MIMO VLC optical transmission system based on LEDs in a double role
Autorzy:
Kowalczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1065670.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.50.Qx
07.60.-j
42.72.Bj
42.79.-e
42.82
Opis:
The article presents the concept solution of two main issues of visible light communication systems, i.e. the lack of a cost-effective feedback channel and the handling of high throughput. The concept is based on merging of the multiple input multiple output approach, well-known from radio transmission domain, with using of LEDs in a double role, i.e. both as emitters and detectors of light. The feasibility of the proposal was confirmed by the results of the research, carried out for two-channel system of this type.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 41-44
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Comparison of Different Theoretical Models of Positron Lifetime Spectra for Polymers
Autorzy:
Kansy, J.
Powiązania:
https://bibliotekanauki.pl/articles/1812531.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The same reference positron lifetime spectra of polyurethane, measured in temperature range 112 to 390 K, were analyzed with three theoretical models: the "conventional" model with three exponential decay component of discrete values of lifetimes, a model with one discrete exponential component and two "packages" of exponentials with log-normal distribution of annihilation rates, and a model considering positronium slow localization, positronium internal relaxation as well as "delayed" formation of positronium. It turns out that the two latter models fit to the experimental data with the same excellent quality, in spite of the fact that in both models the ratio of intensities related to para-positronium and ortho-positronium was constrained to be as 1:3.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1397-1407
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new approach to the presentation of the positron annihilation lifetime spectroscopy results, n-alkanes
Autorzy:
Zgardzińska, B.
Standzikowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1057935.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
78.70.Bj
82.30.Gg
Opis:
The standard form of the positron annihilation lifetime spectroscopy results presentation are two plots of o-Ps lifetime and intensity as a function of external factor, e.g. temperature, pressure. Both o-Ps parameters change (stepwise) when in the medium phase transitions occur. For a more complete picture of the structural changes occurring in the matter we suggest to use an additional plot, in the coordinates, (τ₃, I₃). The hydrocarbons are selected to show the advantages following from the presentation of the results in the intensity-lifetime (INTI) plot.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1496-1500
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Project for Calculations of e$\text{}^{+}$-e$\text{}^{-}$ Interaction in Real Metals
Autorzy:
Boroński, E.
Powiązania:
https://bibliotekanauki.pl/articles/2007917.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
71.10.-w
71.60.+z
Opis:
A method based on numerical relaxation technique is proposed for solving directly the three-dimensional Euler-Lagrange equation for the density amplitude of conduction electrons in real metals disturbed by the positron. The method has been tested with good results for the positron in an inhomogeneous electron gas. The preliminary calculations of positron screening in lithium give hope for effective applications to real systems.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 461-468
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Real-Time S-Parameter Imaging System
Autorzy:
Naik, P. S.
Cheung, C. K.
Beling, C. D.
Fung, S.
Powiązania:
https://bibliotekanauki.pl/articles/2043310.pdf
Data publikacji:
2005-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.30.Va
78.70.Bj
Opis:
Obtaining a lateral S-parameter image scan from positrons implanted into semiconductor devices can be a helpful research tool both for localizing device structures and in diagnozing defect patterns that could help interpret function. S-parameter images can be obtained by electromagnetically rastering a variable energy positron beam of small spot size across the sample. Here we describe a general hardware and software architecture of relatively low cost that has recently been developed in our laboratory which allows the whole sub-surface S-parameter image of a sample or device to be obtained in real time. This system has the advantage over more conventional sequential scanning techniques of allowing the operator to terminate data collection once the quality of the image is deemed sufficient. As an example of the usefulness of this type of imaging architecture, S-parameter images of a representative sample are presented at two different positron implantation energies.
Źródło:
Acta Physica Polonica A; 2005, 107, 5; 761-768
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study of Defects in Iron Based Alloys by Positron Annihilation Techniques
Autorzy:
Mostafa, K.
De Baerdemaeker, J.
Segers, D.
Calvillo, P.
Van Caenegem, N.
Houbaert, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1812543.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
62.20.F-
Opis:
Defects in different iron based alloys were studied at room temperature using positron annihilation techniques. In FeSi alloys, it was found that the Si content and the deformation temperature affect the positron annihilation parameters. In Fe-Mn-Si-Cr-Ni-C samples with different deformations, positron lifetime measurements were carried out before and after isochronal annealing. X-ray diffraction gave information about the different microstructural phases that exist in the deformed alloys before and after annealing. During deformation a martensiticεphase is induced. At 500°C, defects and theεmartensite phase were almost annealed out from the low deformed samples.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1471-1478
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study of Positron Properties in Quartz Crystals and Synthetic Silica Glass
Autorzy:
Anwand, W.
Brauer, G.
Hasegawa, M.
Dersch, O.
Rauch, F.
Powiązania:
https://bibliotekanauki.pl/articles/2024077.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The monoenergetic positron beamline "SPONSOR" at Rossendorf has been used to investigate the positron behaviour in a naturally grown Brasilian quartz, two synthetic quartz crystals of different origin, and synthetic silica glass. The measurements allow us to obtain the positron diffusion length of free positrons and Bloch para-positronium, if formed, in these materials. In addition, hydrothermal treatment of a synthetic quartz has been used to introduce hydrogen into the crystal up to a certain depth. The presence of hydrogen is found to influence the formation of para-positronium. The depth distribution of hydrogen has been measured independently by nuclear reaction analysis, and will be discussed in comparison with the results deduced from the positron studies.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 321-328
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Absorption Studies on Some Silicate and Cabal Glasses Containing NiO or $Fe_{2}O_{3}$ or Mixed NiOi + $Fe_{2}O_{3}$
Autorzy:
Moustaffa, F.
El-Batal, F.
Fayadd, A.
El-Kashef, I.
Powiązania:
https://bibliotekanauki.pl/articles/1538677.pdf
Data publikacji:
2010-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Ce
42.72.Bj
71.20.Be
76.80.+y
Opis:
Ultraviolet and visible absorption of some sodium and potassium silicate and cabal glasses containing nickel oxide, ferric oxide or both nickel and ferric oxides together have been investigated. In alkali silicate glasses, nickel ions reveal no ultraviolet absorption bands but they show characteristic visible absorption bands due to octahedral and tetrahedral coordinations while iron ions show weak visible absorption bands which are related to ferric ions mostly in tetrahedral state, especially at high alkali oxide content; also iron ions reveal charge transfer ultraviolet absorption bands which are assigned mostly to ferric ions with few ferrous contributions. The proportion of tetrahedral state increases with the increase in the alkali oxide content for the two transition metal oxides. In cabal glasses, nickel ions tend to exist mostly in octahedral state, while ferric ions exist mostly in octahedral and some in tetrahedral form, all the absorption obtained are attributed to their respective energy levels. The ratio of the different coordinations states are discussed in relation to the glass composition.
Źródło:
Acta Physica Polonica A; 2010, 117, 3; 471-477
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aerogel IC3120 Under High Pressure Exerted Mechanically and by Nitrogen
Autorzy:
Gorgol, M.
Zgardzińska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1033290.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
36.10.Dr
61.43.Gt
74.62.Fj
Opis:
Highly porous IC3120 silica aerogel was subjected to the high pressure up to 450 MPa while the positron annihilation lifetime spectra were collected. The pressure was delivered to the investigated samples in two ways: by pistons and by gas (nitrogen) penetrating the aerogel. The evolution of all PALS parameters was discussed. With the increase of the pressure, shortening of ortho-positronium lifetimes (different, depending on the pressure method introduced) was observed. Similarity between the dependence of the longest-lived o-Ps component lifetime on the pressure, for the sample affected with nitrogen molecules and pure nitrogen was observed. It suggests, that the nitrogen fills the largest free volumes of the aerogel. The pressure exerted mechanically causes much smaller decrease of free volume available for positronium. The comparison of PALS results with the electron microscopy images, obtained after removing the pressure, confirmed that more intense and lasting changes were caused by affecting the aerogel with the pistons.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1531-1534
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algorithm for Shifting Positron Annihilation Spectra
Autorzy:
Dryzek, J.
Polak, A.
Powiązania:
https://bibliotekanauki.pl/articles/2024230.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
We present a simple procedure which allows us to shift the positron annihilation spectra, e.g., the Doppler broadening spectrum of the annihilation line. That is especially required when we wish to compare different spectra obtained with a spectrometer with the reduction of background. As an application of the obtained algorithm we present the studies of positron annihilation in carbon material samples.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 355-361
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Amorphous Carbon Thin Films Deposited on Si and PET: Study of Interface States
Autorzy:
Mariazzi, S.
Macchi, C.
Karwasz, G. P.
Brusa, R. S.
Laidani, N.
Bartali, R.
Gottardi, G.
Anderle, M.
Powiązania:
https://bibliotekanauki.pl/articles/2043339.pdf
Data publikacji:
2005-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ac
71.60.+z
73.20.At
78.70.Bj
Opis:
Thin carbon films with various thicknesses, deposited on different substrates (Si and poly-ethylene-terephthalate) at the same operating conditions in a radio frequency plasma enhanced chemical vapour deposition system were characterized by Doppler broadening spectroscopy. The films and the substrates were depth profiled by a slow positron beam. The aim of these measurements was to study the open volume structure and the interface of the films. It was found that, independently from the substrate, the films were homogeneous and exhibited the same open volume distribution. On the contrary, the effective positron diffusion length in the Si substrate was found to change with the thickness of the carbon films. This behaviour was interpreted as a change in the electric field at the carbon/silicon interface.
Źródło:
Acta Physica Polonica A; 2005, 107, 5; 842-847
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Possible Scattering Processes for Bloch Positronium in Ionic Crystals at Elevated Temperatures
Autorzy:
Bondarev, I. V.
Powiązania:
https://bibliotekanauki.pl/articles/2024215.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
71.60.+z
71.38.+i
36.10.Dr
Opis:
The role of nonpolar optic phonon scattering and of umklapp acoustic phonon scattering is analyzed for a delocalized positronium atom in ionic crystals at elevated temperatures. At temperatures above which they become essential both of these scattering mechanisms contribute to the imaginary self-energy of positronium renormalizing its acoustic deformation potential constant. It was such a renormalization that was recently observed experimentally for delocalized positronium in MgF$\text{}_{2}$ crystal. We put forward the theoretical explanation of these experiments based upon the model of nonpolar optic phonon scattering of positronium. An effect analogous to that observed in MgF$\text{}_{2}$ is predicted for crystalline quartz above the temperature of (α-β)-phase transition.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 337-343
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 307

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