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Wyświetlanie 1-15 z 23
Tytuł:
Relativistic Phenomena in Two-Quantum Annihilation of Electron-Positron Pairs
Autorzy:
Baranowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2047121.pdf
Data publikacji:
2006-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
03.30.+p
Opis:
The kinematics of e$\text{}^{+}$e$\text{}^{-}$ pair and annihilation quanta momentum vectors have been presented basing on ellipse and spheroid properties. Using the formulae resulting from the Lorentz transformation of momentum and energy there was pointed out that the aberration and the longitudinal and transversal Doppler effects are inseparably associated.
Źródło:
Acta Physica Polonica A; 2006, 110, 5; 551-558
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Test Measurements of Modernized Version of Two-Detector Doppler Spectrometer
Autorzy:
Baranowski, A.
Kostrzewa, M.
Szuszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2007881.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
07.85.-m
Opis:
Basing on the electronic analogue modules in adding and subtracting branches of pulses, a modernized two-detector Doppler spectrometer has been constructed using only one multichannel analyser. Doppler spectra for Al, Ni, Ag have been measured. ACARFIT computer program was used to compare the Doppler and angular correlation of annihilation radiation results.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 439-447
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation with Core Electrons in 3d-Transition Metals
Autorzy:
Baranowski, A.
Dębowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/1933461.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.60.+z
78.70.Bj
71.90.+q
Opis:
Recently we have been able to resolve the rare gas core contribution in long-slit angular correlation of annihilation radiation curves for some d-metals when applying a new model to fit the experimental data. In the present paper the model is applied to angular correlation of annihilation radiation spectra for the whole series of the 3d-transition metals from Sc to Cu. The model corresponds to recent theoretical predictions for the metals from the second half of the series and allows one to find the contribution of the core electrons to the whole annihilation process for these metals. Probably a different description of the angular correlation of annihilation radiation data for the metals from the beginning of the 3d-series should be searched.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 13-19
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation with Electrons of Admixture Atoms in Some Binary Nickel Alloys
Autorzy:
Baranowski, A.
Kostrzewa, M.
Szuszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2042168.pdf
Data publikacji:
2005-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
78.30.Er
Opis:
Weighted difference curves have been shortly presented as a proper tool allowing to analyze in another way two-detector Doppler spectra regarding positron annihilation with admixture electrons in some nickel alloys. The analysis of low and middle momentum parts of Doppler spectra for investigated alloys reflects the annihilation of positrons with admixture electrons. There is no distinct signal of annihilations with admixture electrons from the positron lifetime data for well-annealed samples.
Źródło:
Acta Physica Polonica A; 2005, 107, 4; 570-575
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of Cyclohexane + t-Butanol Mixtures from Positron Annihilation and Ultrasonic Velocity Measurements
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929089.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The densities of and sound velocities in t-butyl alcohol solutions in cyclohexane were determined in the temperature range 25 to 45°C. From these data adiabatic compressibility coefficients of the solutions were calculated, as well as excess densities and compressibilities. The positron annihilation spectra of the solutions were measured at room temperature. The results plotted against alcohol concentration show structural processes, which can be attributed to dimerization of the solute molecules.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 321-326
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in and Adiabatic Compressibility of Ethylene Glycol Aqueous Solutions
Autorzy:
Baranowski, A.
Jerie, K.
Gliński, J.
Orzechowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1933468.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The positron annihilation lifetime and ultrasonic velocity in aqueous ethylene glycol solutions were measured. A comparison between the concentration and temperature dependences of the above parameters suggests that there is a competition of hydrophobic (interstitial) and hydrophylic (substitutional) hydration.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 59-66
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of Carbon Tetrachloride + t-Butanol Mixtures from Positron Annihilation and Ultrasonic Velocity Measurements
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929087.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The densities of and sound velocities in t-butyl alcohol solutions in CCl$\text{}_{4}$ were determined in temperature range 25 to 45°C. From these data the adiabatic compressibility coefficients of the solutions were calculated, as well as excess densities and compressibilities. The positron annihilation spectrum for this system in room temperature was measured. The results plotted against alcohol concentration suggest that the structural processes occurring in this system are caused by dimerization of the solute molecules.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 313-320
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annihilation of o-Positronium in the Vicinity of the Critical Mixing Point
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Orzechowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/2008045.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.70.Jk
78.70.Bj
Opis:
Positron annihilation spectra were investigated in the critical region close to the consolute point of ethanol + dodecane mixture. The anomalies of the positron lifetimes and intensities were small, nevertheless it was found that the intensity of short-living components of annihilation spectrum seems to increase close to the critical temperature.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 569-574
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in and Compressibility of Water-Organic Mixtures. The System Water-Acetamide
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Orzechowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1952751.pdf
Data publikacji:
1996-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The experimental results of positron annihilation experiments in aqueous solutions of acetamide were compared to those of ultrasonic velocity. The system under investigation behaves untypically when changing acetamide concentration. From the point of view of surface tension it interacts with water like normal alcohols, while the positron annihilation and ultrasonic results suggest hydrophilic hydration and lack of hydrophobic interactions.
Źródło:
Acta Physica Polonica A; 1996, 90, 6; 1169-1177
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in and Compressibility of Water-Organic Mixtures. The System Water-Formamide
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Orzechowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1930626.pdf
Data publikacji:
1994-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The experimental results of positron annihilation experiments in aqueous solutions of formamide were compared to those of ultrasonic velocity. The systems under investigation behave untypically while changing formamide concentration. The results are explained in terms of hydrophilic hydration and lack of hydrophobic interactions.
Źródło:
Acta Physica Polonica A; 1994, 85, 3; 563-569
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in and Compressibility of Water-Organic Solutions. The System Water-Pyridine
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Jeżowska-Trzebiatowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1920939.pdf
Data publikacji:
1992-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The results of positron lifetime and ultrasonic velocity measurements in dilute aqueous pyridine (PYR) solutions show unusual changes in ultrasonic, annihilation data in function of pyridine concentration. The results obtained suggest that strong structural changes occur in the system, in the region of low pyridine concentrations. Liquid clathrate hydrates forming in the system are supposed with unusual stoichiometry and untypical geometry. They are supposed to be very short-living and/or unstable.
Źródło:
Acta Physica Polonica A; 1992, 82, 3; 471-479
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of Aqueous Solutions of Tetramethylammonium Chloride Investigated by Positron Annihilation and Ultrasonic Methods
Autorzy:
Jákli, G.
Jerie, K.
Baranowski, A.
Gliński, J.
Powiązania:
https://bibliotekanauki.pl/articles/1968886.pdf
Data publikacji:
1998-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The structure of aqueous solutions of tetramethylammonium chloride was investigated using sound velocity and positron annihilation methods. The results are different than those obtained earlier for systems where hydrophobic hydration occurs, although some evidences for formation of clathrate-like hydrates in liquid phase were observed. The results are interpreted, among others, in terms of competition of different hydrates of tetraalkylammonium cations, hydration of chloride anions, and formation of ionic pairs.
Źródło:
Acta Physica Polonica A; 1998, 93, 4; 649-658
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of Aqueous Solutions of Acetonitrile Investigated by Acoustic and Positron Annihilation Measurements
Autorzy:
Jerie, K.
Baranowski, A.
Koziol, S.
Gliński, J.
Burakowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2043335.pdf
Data publikacji:
2005-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
We report the results of acoustic and positron annihilation measurements in aqueous solutions of acetonitrile (CH$\text{}_{3}$CN). Hydrophobicity of the solute is discussed, as well as the possibility of describing the title system in terms of hydrophobic solvation. The concept of Levay et al. of calculating the "ideal positronium lifetimes is applied, basing on the mean volume of cavities (holes) in liquid structure available for positronium pseudoatom. The same calculations performed using the Tao model of annihilation yield very different results. It can be concluded that either acetonitrile forms with water clathrate-like hydrates of untypical architecture, or it is too weak hydrophobic agent to form clathrate-like hydrates at all. The former interpretation seems to be more probable.
Źródło:
Acta Physica Polonica A; 2005, 107, 5; 826-831
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Chloropolystyrenes
Autorzy:
Baranowski, A.
Dębowska, M.
Jerie, K.
Mirkiewicz, G.
Rudzińska-Girulska, J.
Sikorski, R. T.
Powiązania:
https://bibliotekanauki.pl/articles/1928863.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.60.+z
78.70.Bj
81.20.Sh
82.30.Hk
Opis:
Results of angular correlation of annihilation radiation and positron annihilation lifetime measurements are presented for atactic polystyrene and chloropolystyrenes. The inhibition of positronium formation follows the chlorine introduction as the decrease in intensities of the narrow component in angular correlation of annihilation radiation curves and of the longest-lived component in positron annihilation lifetime spectra prove. In general, the chlorine "activity" towards positrons seems to depend on its position in the polymer structure. The annihilation rate distribution as well as the radius and volume distributions of free-volume sites where positronium is assumed to be formed obtained with the use of CONTIN program for the raw sample in the 2nd series are given additionally.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 239-249
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studying of Nickel Alloys with 1 at.% of Ge, Zn, In, Zr and Pb by Positron Annihilation Methods
Autorzy:
Baranowski, A.
Kostrzewa, M.
Szuszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2024150.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
78.30.Er
Opis:
The measurements of cold rolled nickel alloys with 1 at.% of Ge, Zn, In, Zr, Pb and additionally Ti and Sb by positron lifetime and Doppler broadening techniques have been done. Monovacancies were a dominating type of defects in the alloys. The authors of the present paper connect the differences between the annihilation parameters of the investigated samples with the existence of the vacancy-impurity atom pairs. A direct proportionality between the vacancy lifetime and the product of vacancy-impurity binding energy and atomic radius of impurity atom has been found.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 329-336
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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