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Tytuł:
Prospects of Positronium Spin Rotation Using for Medium Investigation
Autorzy:
Baryshevsky, V. G.
Metelitsa, O. N.
Powiązania:
https://bibliotekanauki.pl/articles/1933470.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
Opis:
The feasible applications of a new positron spectroscopy technique based on measuring of the time oscillation under positronium annihilation is analyzed.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 67-72
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
To the Possibility of Measurements of Orthopositronium Annihilation Amplitudes for QED Testing
Autorzy:
Baryshevsky, V. G.
Metelitsa, O. N.
Powiązania:
https://bibliotekanauki.pl/articles/1933471.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
Opis:
In connection with previously revealed disagreement of theoretically calculated and measured orthopositronium decay rate in vacuum we suggest the experiment to clarify which of the positronium annihilation amplitudes R$\text{}_{m}$,m = 0,±1 causes this disagreement. The developed for this purpose experimental procedure can also be used as the basis for the new area of positron spectroscopy, connected with the investigation of the anisotropic (spin dependent) interaction of positronium in the media.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 73-78
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Current Problems and Unknowns in Positronium Dynamics
Autorzy:
Duplâtre, G.
Powiązania:
https://bibliotekanauki.pl/articles/1812489.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
Opis:
A survey is made on positronium dynamics in liquids. From literature data, it is shown that applying conventional kinetics to positronium reactions leads to quite satisfactory results in a large variety of solvents, solutes, reaction types and temperatures. On the opposite, applying the theoretically well established concepts of positronium bubble state and time-dependent reaction rate coefficient would imply the use of unrealistic solute radii in the related kinetic equations, with possible exception of large solutes (micelles). Some solutes displaying unexpectedly high reaction rate constants are shown to be refractory to any of the above quantitative approaches. The particular case of reversible positronium bound-state formation is further examined, the most consistent results arising, again, from the conventional analysis of the data.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1347-1358
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Comments on p-Ps and Density Parameter
Autorzy:
Goworek, T.
Wawryszczuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1933488.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
Opis:
The constraint-free analysis of several representative positron lifetime spectra was performed with the resolution time of 144 ps. The role of p-Ps parameters in understanding of the positronium structure in solids is discussed.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 135-138
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of Dr Green foliar fertilization on plant health during the growing period as well as on the potato yield and quality (Jelly variety)
Wpływ nawożenia dolistnego technologią Dr Green na zdrowotność roślin w czasie wegetacji oraz wielkość i jakość plonu ziemniaka odmiany Jelly
Autorzy:
Witek, G.
Gorzelany, J.
Matłok, N.
Powiązania:
https://bibliotekanauki.pl/articles/93726.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
potato
foliar fertilization
Dr Green technology
ziemniak
nawożenie dolistne
technologia Dr Green
Opis:
The potato (Solanum tuberosum L.) is one of the four major crops in Poland. In 2013 the area used for potato cultivation in Poland reached 270 thousand hectares. Among the important factors influencing the potato yield and quality are: soil cultivation and protection of plants. One of the most essential factors affecting the potato yield and quality is fertilization. The aim of the field trials carried out in 2014 on experimental potato plots was to determine the effect of dr Green foliar feed nutrients on plant health and on potato quality and yield (Jelly variety). The results of the studies and observations revealed that the application of Dr Green Ziemniak, Dr Green Start and Dr Green Energy foliar feeds favourably affected the quality, yield and structure of Jelly potato tuber crop.
Ziemniak (Solanum tuberosum L.) jest jedną z czterech najpopularniejszych roślin uprawnych w Polsce. Wielkość produkcji ziemniaka w 2013 roku w kraju wynosiła ponad 270 tysięcy hektarów. Istotnymi czynnikami kształtującymi wielkość i jakość plonów ziemniaka są między innymi uprawa roli i ochrona plantacji. Jednakże do najważniejszych czynników mających podstawowe znaczenie w kształtowaniu ilości i jakości uzyskiwanego plonu ziemniaka jest nawożenie. Celem przeprowadzonych w 2014 roku doświadczeń mikropoletkowych było określenie wpływu nawożenia dolistnego technologią Dr Green na zdrowotność roślin oraz na jakość i wielkość plonu ziemniaka odmiany Jelly. Uzyskane wyniki badań i przeprowadzonych obserwacji wykazały, że dolistna aplikacja nawozami Dr Green Ziemniak, Dr Green Start oraz Dr Green Energy korzystnie wpłynęła na jakość, wielkość i strukturę plonu bulw badanej odmiany ziemniaka.
Źródło:
Agricultural Engineering; 2016, 20, 2; 149-156
2083-1587
Pojawia się w:
Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Dr. Stockmann’s Parrhesia: Ibsen’s “An Enemy of the People” in the Light of Foucault
Autorzy:
Haj’jari, Mohammad-Javad
Hooti, Noorbakhsh
Powiązania:
https://bibliotekanauki.pl/articles/1154269.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Dr. Stockmann
Foucault
Ibsen
Parrhesia
Opis:
An honest intellectual dutifully standing with truth against lies and treacheries of his society is a parrhesiastic figure in Foucault’s terminology. Foucault takes parrhesia as the fearless and frank speech regarding the truth of something or a situation before truth-mongering and public deception and he takes the parrhesiastic as the spokesperson for truth. In this light, Dr. Stockmann in Ibsen’s An Enemy of the People occupies a unique position within Ibsen’s political philosophy. Dutifully criticizing what the majority blindly take for granted from their liar leaders in the name of democracy, Dr. Stockmann fulfills the role of a parrhesiastic figure that stands against socio-political corruption. He enters a parrhesiastic game with both the majority and the officialdom to fulfill his democratic parrhesia as a truthful citizen before the duped community, while covertly preparing for his own philosophic parrhesia or self-care within the conformist community. However, his final failure lies in his confrontation with democracy itself, which wrongly gives the right of speaking even to the liars. This article thus aims at analyzing Ibsen’s play through a Foucauldian perspective regarding the concept of parrhesia and its relation to democracy. It is to reveal Ibsen’s satire on the fake ideology of democracy and highlight the necessity of humanity’s parrhesiastic self-care for the well-being of the self and the others.
Źródło:
Folia Scandinavica Posnaniensia; 2019, 26; 27-48
1230-4786
2299-6885
Pojawia się w:
Folia Scandinavica Posnaniensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prof. zw. dr Zbigniew Janowicz – wspomnienie o znakomitym znawcy prawa i procedury administracyjnej
Autorzy:
Skoczylas, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/693848.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Prof. zw. dr Zbigniew Janowicz
Opis:
.
Źródło:
Ruch Prawniczy, Ekonomiczny i Socjologiczny; 2012, 74, 1; 253-255
0035-9629
2543-9170
Pojawia się w:
Ruch Prawniczy, Ekonomiczny i Socjologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
UROCZYSTOŚĆ JUBILEUSZU 70-LECIA URODZIN PROFESORA FELIKSA ZEDLERA
Autorzy:
Grzegorczyk, Paweł
Walasik, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/692788.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
profesora dr. hab. Feliks Zedler
Opis:
.
Źródło:
Ruch Prawniczy, Ekonomiczny i Socjologiczny; 2012, 74, 4; 303-305
0035-9629
2543-9170
Pojawia się w:
Ruch Prawniczy, Ekonomiczny i Socjologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane reminiscencje z życia prof. dr hab. Łukasza Karwowskiego
Autorzy:
Szopa, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2195039.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
prof. dr hab. Łukasz Karwowski
Opis:
Wybrane reminiscencje z życia prof. dr hab. Łukasza Karwowskiego
Źródło:
Acta Societatis Metheoriticae Polonorum; 2023, 14; 9-17
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detektory promieniowania stosowane w cyfrowej radiografii bezpośredniej
Radiation detectors used in Digital Direct Radiography
Autorzy:
Mackiewicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/107842.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
radiografia cyfrowa
panele płaskie
radiografia bezpośrednia DR
digital radiography
flat panel detectors
direct radiography DR
Opis:
W artykule opisano podstawy działania detektorów promieniowania stosowanych w cyfrowej radiografii bezpośredniej - DR. Scharakteryzowano różne rodzaje paneli płaskich pod kątem ich przydatności w obszarze badań nieniszczących. W sposób bardziej szczegółowy omówiono panele płaskie z przemianą pośrednią oparte na matrycy a-Si z tranzystorami TFT, które wykazują obecnie największą przydatność do zastosowań w badaniach nieniszczących. Przeanalizowano najważniejsze parametry paneli płaskich w aspekcie ich zastosowań do badań złączy spawanych oraz innych wyrobów i elementów badanych dotychczas tradycyjną metodą radiograficzną.
The article describes the basics of radiation detectors used in direct digital radiography - DR. Various types of flat panel detectors (FPD) have been characterized for their usefulness in non-destructive testing. The indirect panels based on the a-Si matrix with TFT transistors, which are currently the most useful option for non-destructive testing, are discussed in more detail. The most important parameters of flat panel detectors have been analyzed in the aspect of their applications for the examination of welded joints and other products tested so far by traditional radiographic method.
Źródło:
Badania Nieniszczące i Diagnostyka; 2017, 1-2; 44-51
2451-4462
2543-7755
Pojawia się w:
Badania Nieniszczące i Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recent Developments in Ultrafast Time-Resolved Vibrational Spectroscopy of Electronically Excited States
Autorzy:
Hamaguchi, H.
Powiązania:
https://bibliotekanauki.pl/articles/1993578.pdf
Data publikacji:
1999-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
39.30.+w
42.65.Dr
Opis:
Developments of three new time-resolved vibrational spectroscopies and their applications to electronically excited states are reviewed. Transformlimited picosecond time-resolved Raman spectroscopy has been used to study the vibrational dynamics of trans-stilbene in the lowest excited singlet state. Picosecond time-frequency two-dimensional multiplex Coherent Antistokes Raman Scattering spectroscopy has been used to probe the structure of diphenylacetylene in the lowest and the second lowest excited singlet states. Nanosecond time-resolved dispersive infrared spectroscopy has detected the singlet and triplet intramolecular charge transfer states of 4-(di-methylamino)benzonitrile. Strong evidence for a charge transfer structure has been obtained.
Źródło:
Acta Physica Polonica A; 1999, 95, 1; 37-48
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does Positronium Feel Dynamics of Polymer Chain?
Autorzy:
Krištiak, J.
Šauša, O.
Bandžuch, P.
Zrubcová, J.
Bartoš, J.
Powiązania:
https://bibliotekanauki.pl/articles/2008075.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
83.80.Dr
Opis:
The annihilation experiments on simple elastomers at wide temperature interval of (15-370) K will be described. The results are consistently interpreted using free-volume models of polymer structure. The procedure of deducing some parameters of theory of polymers (e.g. viscosity, Vogel-Fulcher temperature) from the positron annihilation experiments will be shown. A great potential of positron annihilation in the study of amorphous polymers will be emphasized.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 596-604
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure Effects in ortho-Positronium Annihilation
Autorzy:
Goworek, T.
Wawryszczuk, J.
Zaleski, R.
Powiązania:
https://bibliotekanauki.pl/articles/2042179.pdf
Data publikacji:
2005-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
78.70.Bj
Opis:
A short review of experiments concerning the influence of high pressure on positron annihilation in molecular solids is given. To this kind of experiments belong e.g. pressure inhibition of positronium formation, pressure induced phase transitions, and free volume swelling in the media intercalated by high pressure gas.
Źródło:
Acta Physica Polonica A; 2005, 107, 4; 608-614
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative study regarding the last 25 years of the Croatian defence academy “Dr. Franjo Tuđman”
Autorzy:
ČurČija, Slobodan
Karlović, Goran
Powiązania:
https://bibliotekanauki.pl/articles/576489.pdf
Data publikacji:
2016-03-31
Wydawca:
Akademia Sztuki Wojennej
Tematy:
Dr. Franjo Tuđman
Croatian Defence Academy
Opis:
Dr. Franjo Tuđman Croatian Defence Academy is a military-educational institution of the Croatian Armed Forces (CAF). Its mission is to prepare and qualify, through education and training, officers, NCOs and civil servants for implementation of the Armed forces’ missions as set out in strategic documents, missions and tasks.
Źródło:
Security and Defence Quarterly; 2016, 10, 1; 101-117
2300-8741
2544-994X
Pojawia się w:
Security and Defence Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wprowadzenie (Prof. zw. dr hab. Uniwersytetu Łódzkiego Czesław Sikorski – sylwetka naukowca i nauczyciela akademickiego)
Autorzy:
Czapla, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/656605.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Prof. zw. dr hab. Czesław Sikorski
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2013, 282
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positronium Formation in Solid Long-Chain Alkanes
Autorzy:
Zaleski, R.
Wawryszczuk, J.
Goworek, T.
Powiązania:
https://bibliotekanauki.pl/articles/2042188.pdf
Data publikacji:
2005-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
78.70.Bj
Opis:
This paper represents a fragment of systematic studies on positron annihilation in solid saturated hydrocarbons (alkanes, paraffins) from C$\text{}_{17}$H$\text{}_{36}$ to C$\text{}_{30}$H$\text{}_{62}$. The Tao-Eldrup model and its extensions allow to identify the places in the crystalline structure where positronium is trapped, and estimate respective trap sizes. In the rigid phase I positronium locates mainly in two-dimensional empty spaces between the lamellae of crystal structure. Additional free volumes exist in high temperature phases due to appearance of n-alkane conformers representing a non-planar molecule distortion. The rise of ortho-positronium intensity with the sample irradiation dose, which was seen earlier in polymers, is observed also in n-alkanes. One can find similarities between the ortho-positronium annihilation in crystalline alkanes and polymers, like exponential character of that rise, and the trap bleaching by illumination. It confirms the same origin of the intensity growth, i.e. the accumulation of trapped electrons. Two kinds of electron traps were found. The time constant of electron accumulation in the traps depends on the carbon chain length and varies with temperature in different way for even- and odd-numbered alkanes.
Źródło:
Acta Physica Polonica A; 2005, 107, 4; 635-641
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-Quantum Annihilation in Porous Vycor Glass
Autorzy:
Jasińska, B.
Wawryszczuk, J.
Zaleski, R.
Powiązania:
https://bibliotekanauki.pl/articles/2043332.pdf
Data publikacji:
2005-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
78.70.Bj
Opis:
Three methods of determination of 3γ o-Ps decay intensity are compared. The estimate of 3γ fraction obtained from classical lifetime measurements can be distorted due to a higher absorption of theγ quanta from the continuous spectrum of three-quantum decay, compared to two-quantum one.
Źródło:
Acta Physica Polonica A; 2005, 107, 5; 821-825
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena wzmocnienia podłoża metodą wymiany dynamicznej na podstawie próbnych obciążeń kolumn
Evaluation of ground improvement with dynamic replacement method based on trial load tests of columns
Autorzy:
Horodecki, G.
Powiązania:
https://bibliotekanauki.pl/articles/403237.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
wymiana dynamiczna
kolumny DR
próbne obciążenia
osiadania
analiza
dynamic replacement
DR column
load tests
subsidence
analysis
Opis:
W artykule przedstawiono analizę wykonanego wzmocnienia słabego podłoża gruntowego pod nasyp drogowy w technologii kolumn DR. Omówiono warunki geotechniczne podłoża i zastosowane rozwiązania. Wykonano analizę wsteczną na podstawie wyników próbnych obciążeń kolumn oraz pomiarów osiadań wzmocnionego podłoża całego obszaru. Porównano uzyskane wyniki i wyciągnięto wnioski.
The paper presents the analysis of realised ground improvement of soft subsoil by means of dynamic replacement method under road embankment. The description of the geotechnical properties and implemented solutions were presented. The backup analysis, based on the results of the trial load tests of columns and settlement results of the whole improvement area was done. The analysis results with the measured results were compared and conclusions were drown.
Źródło:
Budownictwo i Inżynieria Środowiska; 2013, 4, 4; 257-263
2081-3279
Pojawia się w:
Budownictwo i Inżynieria Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie wybranych systemów obrazowania cyfrowego w mammografii
Comparison of chosen digital imaging systems in mammography
Autorzy:
Jakubowska, T.
Powiązania:
https://bibliotekanauki.pl/articles/262184.pdf
Data publikacji:
2012
Wydawca:
Politechnika Wrocławska. Wydział Podstawowych Problemów Techniki. Katedra Inżynierii Biomedycznej
Tematy:
mammografia cyfrowa
obrazowanie cyfrowe
DR
CR
digital mammography
digital imaging
dynamic replacement (DR)
computed radiography (CR)
Opis:
Mammografia jest najbardziej czułym i specyficznym badaniem w diagnozowaniu raka sutka. Zastosowanie techniki cyfrowej CR (Computed Radiography) i DR (Digital Radiography) ma na celu poprawę jakości obrazów, a co za tym idzie poprawę wykrywalności zmian przy jednoczesnym skróceniu czasu badania i obniżeniu dawki promieniowania. Niniejsza praca przedstawia porównanie stosowanych obecnie w mammografii wybranych systemów cyfrowych pod względem jakości obrazowania, jak również stosowanych dawek.
Mammography is a most sensitive and specific examination used in the breast cancer diagnosis. Digital radiographic systems CR (Computed Radiography) and DR (Digital Radiography) offer the high quality imaging with shorter exposure times, thus lowering the radiation dose. In this paper, the comparison of frequently used mammographic digital systems in terms of the imaging quality and doses applied, is presented.
Źródło:
Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna; 2012, 18, 4; 260-266
1234-5563
Pojawia się w:
Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sprawozdanie z działalności Akademickiego Koła Misjologicznego im. dr Wandy Błeńskiej w roku akademickim 2017/2018
Autorzy:
Wachowiak, Agata Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/618077.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Akademickie Koło Misjologiczne im. dr Wandy Błeńskiej
Opis:
.
Źródło:
Annales Missiologici Posnanienses; 2018, 23; 201-204
1731-6170
Pojawia się w:
Annales Missiologici Posnanienses
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zjazd konserwatorów w Łańcucie
Autorzy:
Szymański, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/539069.pdf
Data publikacji:
1948
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
Ogólnopolski Zjazd Konserwatorów w Łańcucie
prof. dr Jan Zachwatowicz
prof. dr Piotr Biegański
wytyczne podstaw prac konserwatorskich
uchwalone rezolucje
Źródło:
Ochrona Zabytków; 1948, 3-4; 164-166
0029-8247
Pojawia się w:
Ochrona Zabytków
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Manifestation of Nonlinear Properties of Acentric Trigonal LaBGeO$\text{}_{5}$ and Orthorhombic Gd$\text{}_{2}$(MoO$\text{}_{4}$)$\text{}_{3}$ Laser Crystal-Hosts: Multiple Stokes and Anti-Stokes SRS and SHG Due to Cerenkov-Type Phase Matching
Autorzy:
Kaminskii, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/1945474.pdf
Data publikacji:
1996-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Dr
42.65.Ky
42.65.Vh
Opis:
We have discussed new optical potentialities in acentric Gd$\text{}_{2}$(MoO$\text{}_{4}$)$\text{}_{3}$ and LaBGeO$\text{}_{5}$ laser crystal-hosts having simultaneously relatively high χ$\text{}^{(2)}$ and χ$\text{}^{(3)}$ nonlinear susceptibilities. In particular, we show experimental results on efficient multiple Stokes and anti-Stokes stimulated Raman scattering and Raman induced four-wave mixing, as well as second harmonic generation with Cerenkov-type phase matching.
Źródło:
Acta Physica Polonica A; 1996, 90, 1; 93-100
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oscillations in Orthopositronium Annihilation in Magnetic Field in SiO$\text{}_{2}$ Powders
Autorzy:
Berestov, A. V.
Talat, A. S.
Baranov, V. V.
Rudak, E. A.
Martsynkevich, B. A.
Powiązania:
https://bibliotekanauki.pl/articles/1933473.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.85.+n
36.10.Dr
78.70.Bj
Opis:
The observation method of γ-quantum angular distribution oscillations in positronium annihilation in magnetic field is essentially improved. Oscillation parameters in the experiment are in agreement with theoretical estimations.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 79-82
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Discrete and Continuous Analysis of Positron Lifetime Spectra: a Comparison
Autorzy:
Consolati, G.
Quasso, F.
Powiązania:
https://bibliotekanauki.pl/articles/2007998.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
71.60.+z
78.70.Bj
Opis:
Positron lifetime spectra in poly[1-(trimethylsilyl)]propine membranes were collected at different temperatures and various number of accumulated counts, in order to compare the results from analyses obtained by different decay models: discrete (that is, purely exponential) or continuous (with at least one distribution of lifetimes). Analysis into four discrete components is inadequate, unless a low number of counts (1 to 2 millions) is accumulated. Conversely, deconvolutions which allow the ortho-positronium lifetime to be distributed give satisfactory fits, even at the highest statistics (60 millions). An equivalent good fit in terms of χ$\text{}^{2}$ test is obtained with a five discrete components analysis, from which it is possible to extract information on the first moments (centroid and standard deviation) of ortho -positronium lifetime distribution.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 505-508
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positronium Formation in Organic Liquids
Autorzy:
Karbowski, A.
Fedus, K.
Służewski, K.
Bruzdowska, J.
Karwasz, G.
Powiązania:
https://bibliotekanauki.pl/articles/1030028.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
82.30.Gg
36.10.Dr
Opis:
This paper reports on the results of positron annihilation lifetime measurements of three organic liquids: benzene (C₆H₆), cyclohexane (C₆H₁₂), and methanol (CH₃OH). The lifetime spectra are acquired at different temperatures for non-degassed, degassed, and oxygen-saturated samples, at temperatures between 5°C and 25°C. The spectra are analyzed using a standard three-exponential model. The influence of oxygen on each lifetime and intensity component is discussed.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1466-1469
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positronium Formation in Nanostructured Metals
Autorzy:
Čížek, J.
Melikhova, O.
Hruška, P.
Vlček, M.
Anwand, W.
Liedke, M.
Novotný, M.
Bulíř, J.
Powiązania:
https://bibliotekanauki.pl/articles/1033937.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
41.75.Fr
36.10.Dr
Opis:
Positronium formation in Au films was studied using a magnetically guided continuous slow positron beam with variable energy. Black Au film with porous morphology was compared with conventional smooth Au film. In the smooth Au film positronium is formed on the film surface only. The black Au film exhibits porous sub-surface region containing micro-cavities interconnected with surface. Positronium is formed on inner surfaces of micro-cavities in the sub-surface region and travels through interconnected cavities towards the surface. 3-γ annihilation of ortho-positronium leaves a clear signature in two-dimensional coincidence Doppler broadening spectra. Measures of 3-γ annihilation contribution calculated from single γ-ray and coincidence Doppler broadening spectra were calculated and compared.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1579-1584
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical study of atomic excitation by impact of protons in the variational formalism
Autorzy:
El Houda Benmansour, N.
Bouamoud, M.
Sahlaoui, M.
Powiązania:
https://bibliotekanauki.pl/articles/1068150.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Dp
34.50.Fa
95.30.Dr
Opis:
Schwinger's variational principle is used to evaluate excitation cross-sections of hydrogen atom by proton impact in a range of energies excluding a pertubative treatment. To describe the strong coupling between the excitation and the capture channels that exists at low energies, the continuum states have been introduced in the total wave function. Our results show that these states can describe properly the projectile capture states.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 145-146
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chaotic Scattering: Exact Results and Microwave Experiments
Autorzy:
Guhr, T.
Powiązania:
https://bibliotekanauki.pl/articles/1190089.pdf
Data publikacji:
2015-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Mt
03.65.Nk
24.60.Dr
Opis:
Scattering experiments are indispensable for the study of classical and quantum systems. In the Heidelberg approach, universal features are addressed by assuming that the reaction zone is fully quantum chaotic. Although it stems from nuclear physics, it later on turned out to be applicable to a large variety of systems on different scales, including classical wave systems. For a long time, the distribution of the off-diagonal scattering-matrix elements resisted analytical treatment. I review two recent studies in which my collaborators and I fully solved this problem. We also carried out a comparison with data from microwave experiments.
Źródło:
Acta Physica Polonica A; 2015, 128, 6; 963-967
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positronium Formation at Low Temperatures in Polymers and Other Molecular Solids
Autorzy:
Hirade, T.
Powiązania:
https://bibliotekanauki.pl/articles/2042181.pdf
Data publikacji:
2005-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
78.70.Bj
36.20.Kr
Opis:
Positronium (Ps) formation by weakly localized long-lived electrons (trapped electrons or anions) and positrons at low temperatures successfully explained the Ps formation enhancement at low temperatures observed in polymers and molecular solids. This Ps formation process is different from Ore process and spur process. The phenomena expected by this Ps formation mechanism, such as an effect due to visible light exposure, a density dependence of weakly localized electrons and the delayed Ps formation were successfully observed as the experimental evidence of this Ps formation process. Some possibilities for application of this new Ps formation were also given. One is a new idea for estimation of spin polarity of positrons. Another is the possibility of application to study the local molecular motion by observing the decay of Ps formation intensity.
Źródło:
Acta Physica Polonica A; 2005, 107, 4; 615-622
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revision of the Model of Formation of Radiolytic Products in Aqueous Solutions
Autorzy:
Stepanov, S. V.
Byakov, V. M.
Powiązania:
https://bibliotekanauki.pl/articles/2042192.pdf
Data publikacji:
2005-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.Fe
36.10.Dr
78.70.Bj
Opis:
Mathematical model of formation of radiolytic products (e$\text{}_{aq}^{-}$, H, OH, H$\text{}_{2}$, H$\text{}_{3}$O$\text{}^{+}$, OH$\text{}^{-}$, Ps) in water is developed. It takes into account (1) reactions between dissolved scavengers of thermalized and hydrated electrons as well as epithermal ones; (2) ambipolar diffusion expansion of the intratrack species; (3) additional channels of Ps and H$\text{}_{2}$ formation due to appearance of weakly trapped electrons. Good agreement is obtained with experimental data on kinetics of accumulation of the products in pure water and their concentration variations in aqueous solutions.
Źródło:
Acta Physica Polonica A; 2005, 107, 4; 651-660
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Coincidence Doppler Broadening Spectroscopy to Hydrocarbons at Different Substance States
Autorzy:
Yu, R.
Suzuki, T.
Ito, Y.
Djourelov, N.
Kondo, K.
Shantarovich, V. P.
Powiązania:
https://bibliotekanauki.pl/articles/2042205.pdf
Data publikacji:
2005-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
82.30.Gg
78.70.Bj
Opis:
Coincidence Doppler broadening spectroscopy was applied to study n-hexane (C$\text{}_{6}$H$\text{}_{14}$), cyclohexane (C$\text{}_{6}$H$\text{}_{12}$) and cyclohexanone (C$\text{}_{6}$H$\text{}_{10}$O), at solid, as well as liquid states. The experiments were performed in parallel with traditional positron annihilation lifetime spectroscopy. Significant positron trapping by oxygen was observed in cyclohexanone; the oxygen effect is stronger in liquid state than in solid one, which can possibly be attributed to positron solvation in polar solution. Coincidence Doppler broadening results for n-hexane and cyclohexane indicate an existence of higher energetic annihilation electrons in Ps-bubble forming liquids than that in solids.
Źródło:
Acta Physica Polonica A; 2005, 107, 4; 697-701
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermomechanical and Solid Particle Erosion Behaviour of CaCO₃ and SGF (Short Glass Fibre) Reinforced ABS/PA6 Composites
Autorzy:
Şahin, A.
Yılmaz, S.
Yılmaz, T.
Sınmazçelik, T.
Powiązania:
https://bibliotekanauki.pl/articles/1401281.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Qk
83.85.Vb
91.40.Dr
Opis:
In this study we have investigated thermomechanical and solid particle erosion behaviour of ABS/PA6 composites reinforced with CaCO₃ particles and SGF. ABS/PA6 composites were reinforced with CaCO₃ particles and SGF at different weight ratios (0, 10, 30, 15/15 wt.%). Composite materials were manufactured by twin screw extruder and injection molding machine. Thermomechanical properties were investigated by dynamic mechanical analysis (DMA) method. Moreover erosion wear behaviour was investigated on solid particle erosion test machine. Experimental results show that thermomechanical properties significantly depend on particle types and weight ratios. While storage modulus was found to be maximum for 30 wt.% SGF-reinforced samples, the loss modulus was found to be maximum for 15/15 wt.% hybrid samples. Moreover minimum loss factor values were found for hybrid samples, but glass transition temperature of samples were not effected significantly with CaCO₃ and SGF reinforcement. Erosion behaviour depends on particle impact angle, the type of reinforcing particles and their weight ratios. Maximum erosion rates were found at impingement angle of 30° for 30 wt.% CaCO₃-filled samples. According to experimental results both CaCO₃ and SGF reinforcement have positive influence on thermomechanical properties. However CaCO₃ and SGF reinforcement have reduced the solid particle erosion resistance of ABS/PA6 composites.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1062-1064
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Structural Properties of Fe-Ti-B Based Alloys Produced by Mechanical Alloying
Autorzy:
Kon, O.
Sen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1401329.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
06.30.Dr
62.20.Qp
Opis:
In the present study, the production of Fe-Ti-B based alloys was realized and their structure and properties were investigated. Mechanical alloying proceeds by the continual cold welding and fracturing of the constituent mixture of Ti+4B+5Fe powder when subjected to the large compressive forces of a high speed mill. The powder charge together with 7 mm diameter steel balls were loaded into a tool steel grinding container at approximately 350 RPM for 20 h. The samples were shaped as cylinder of Ø15×8 mm dimensions by uniaxial pressing at 450 MPa. Then, the green body materials were produced by sintering at 1100°C for 1-4 h in argon atmosphere. The morphology of composite materials was investigated by optical microscopy and scanning electron microscopy and phase analysis was realized by x-ray diffraction analysis. The bulk densities of the materials were measured using by Archimedes method. Also, the micro-hardness of the samples was measured by Vickers indentation technique. As a result, Fe, iron boride (FeB, Fe₂B) and titanium boride (TiB₂) phases were detected in the phase analysis of the Fe-Ti-B based materials. The hardness of the materials was measured between 1107 $HV_{0.05}$ and 1551 $HV_{0.05}$, depending on sintering time. The densities of the samples were determined between 4.205 g/cm³ and 4.219 g/cm³.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1214-1217
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Study of Positronic Atoms with Adiabatic Separation of Positronic Motion
Autorzy:
Strasburger, K.
Wołcyrz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1812552.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.20.Cf
31.50.Bc
36.10.Dr
Opis:
A modified adiabatic approximation, with the positron treated as a light nucleus and its charge included only partially in the electronic Hamiltonian, was applied to compute the energies and properties of bound states of lithium positride, positronic beryllium and positronic magnesium. The electronic Schrödinger equation was solved with the configuration interaction method. No bound state was obtained for lithium positride, while the dissociation energies of positronic beryllium and positronic magnesium were underestimated by 2.6 and 7 millihartrees, respectively. Consequences for the applicability of the adiabatic approximation to describe positronic systems are discussed.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1533-1542
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Początki działalności Generalnego Delegata Rządu dla Galicji (1919—1921)
The beginnings of the General Delegate of the Government for Galicia’s activity (1919—1921)
Autorzy:
Dziadzio, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1394501.pdf
Data publikacji:
2021-07-10
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
General Delegate of the Government for Galicia
Dr Kazimierz Gałecki
Galician Governorate
Generalny Delegat Rządu dla Galicji
dr Kazimierz Gałecki
namiestnictwo galicyjskie
Opis:
Artykuł przedstawia analizę okoliczności powstania urzędu Generalnego Delegata Rządu dla Galicji (1919-1921), jego ustrojową pozycję oraz zakres podjętych  zadań  w pierwszych miesiącach jego działalności. Dzieje tej rządowo-administracyjnej instytucji należą do mniej znanych w porównaniu z wiedzą na temat innych struktur administracji publicznej w początkach polskiej państwowości. Podstawą źródłową rozprawy stanowią lwowskie  i krakowskie materiały  archiwalne. Czynności urzędowe generalnego delegata  wiosną  1919 r. zostały odtworzone na podstawie pierwszego dla rządu  raportu z jego  działalności, które uzupełnione zostały wydawanymi przez delegata okólnikami dla podległych mu urzędów. Dały one obraz zarówno prawno-ustrojowej pozycji generalnego delegata, jak i udokumentowały sposób wykonywania powierzonych mu obowiązków w dziedzinie  utrzymania porządku i bezpieczeństwa, które pokrywały się z kompetencjami namiestnika Galicji w czasach austriackich. W artykule znalazło się także omówienie  stanowiska  Generalnego Delegata K. Gałeckiego w sporze o model administracyjnego ustroju na ziemiach  dawnego Królestwa Galicji i Lodomerii.   
The article presents an analysis of the circumstances surrounding creation of the office of the General Delegate of the Government for Galicia (1919—1921), its position in the political system, and the range of tasks undertaken in the first months of its activity. The his- tory of this governmental-administrative institution is not as well-known as that of other public administration structures from the beginning of Polish statehood. The sources for this study are archival materials from Lviv and Cracow. The administrative activities of the General Delegate in the spring of 1919 were reconstructed on the basis of the first report on his activities to the government, and supplemented with circulars issued by the Delegate for his subordinate offices. They provided a picture of both legal and organisational position of the General Delegate and documented the manner in which this institution carried out the duties entrusted to it regarding preservation of order and security, which corresponded to the competences of the Governor of Galicia in Austrian times. The article also includes a discussion about the stance of General Del- egate K. Galecki in the dispute over the model of administrative system in the lands of the former Kingdom of Galicia and Lodomeria.
Źródło:
Z Dziejów Prawa; 2020, 13; 173-188
1898-6986
2353-9879
Pojawia się w:
Z Dziejów Prawa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Elastic Collision of Two H-Like Atoms Including the Exotic Ps and Mu
Autorzy:
Ray, H.
Powiązania:
https://bibliotekanauki.pl/articles/1030031.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
03.65.Nk
34.50.Cx
Opis:
Elastic collision between two H-like atoms using the ab initio static-exchange model (SEM) and a modified static-exchange model (MSEM) at cold energies are investigated in the center of mass frame considering the system as a four-body Coulomb problem where all the Coulomb interaction terms in the direct and exchange channels are treated exactly. The importance of an exact calculation to find basic physics is highlighted. In addition, the dependence of scattering length on the van der Waals interaction between the atoms and the dependence of scattering length on reduced-mass of the system are derived which is completely new information in the field of science.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1473-1477
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Solution of a Two-Particle Model of Positronium Confined in Small Cavities
Autorzy:
Tanzi Marlotti, G.
Castelli, F.
Consolati, G.
Powiązania:
https://bibliotekanauki.pl/articles/1033255.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
34.80.Lx
78.70.Bj
Opis:
The positronium atom (Ps) is widely used as a probe to characterize nanoporous and mesoporous materials. Existing theoretical models for describing Ps annihilation rates by pick-off processes generally treat Ps as a point particle confined in a potential well. Hence these models do not justify any change in the internal structure of Ps, which is experimentally accessible by means of the contact density parameter. Recently we formulated a two-particle model in which only the electron is confined in the cavity, while the positron is moving freely and feels the medium via a positive work function. We present here a numerical treatment of the problem of calculating contact densities and pick-off annihilation rates, by using a variational method. Results are in agreement with experimental data for a large class of materials, and suggest a way to connect these data with pore sizes and positron work functions.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1575-1578
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:
Investigations of Resorcinol under High Pressure
Autorzy:
Tydda, M.
Jasińska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1196480.pdf
Data publikacji:
2014-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
36.10.Dr
61.66.Hq
Opis:
The investigation of intermolecular free volumes in resorcinol was conducted under high pressure, hydraulic pressure and gas (argon or nitrogen) atmosphere. The sizes of free volumes were estimated basing on the mean lifetime of ortho-positronium (o-Ps). In the first case, a monotonous change of lifetime and intensity was observed for the o-Ps component while the range of pressure was 0-477 MPa. On the other case, the samples were put into the pressure chamber filled with argon or nitrogen in the range of pressure from 0 to 450 MPa. When the pressure chamber was filled with a gas, the appearance of an additional o-Ps component has been found. In the nitrogen atmosphere, the material crushed when the gas pressure reached about 200 MPa, and the mean lifetime of the longest o-Ps component increased.
Źródło:
Acta Physica Polonica A; 2014, 125, 3; 812-815
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanochemical Dechlorination of PVC by Utilizing Eggshell Waste
Autorzy:
Baláž, M.
Baláž, P.
Bujňáková, Z.
Pap, Z.
Kupka, D.
Zorkovská, A.
Powiązania:
https://bibliotekanauki.pl/articles/1375093.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Lg
81.20.Wk
88.20.dr
Opis:
Within this work, the dechlorination of polyvinylchloride (PVC) chemical as a model by co-milling with eggshell was performed in a planetary ball mill in order to show that mechanochemistry can be utilized for the simultaneous treatment of two wastes, while the products of the treatment can be used in further applications. The products of the reaction are water-soluble calcium chloride ($CaCl_2$), which can be used e.g. for de-icing of roads in winter and organic residue on the basis of ethylene, which can be recovered as energy source. The highest dechlorination yield (almost 97%) was achieved under following milling conditions: molar ratio between Ca and Cl: 2.34, ball-to-powder ratio: 65, rotation speed of the planet carrier: 550 rpm, milling time: 4 h and material of milling media: tungsten carbide. The optimum conditions were then applied for the removal of chlorine from industrial waste - the abandoned PVC window parapet. In this case, 95% dechlorination was evidenced.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 884-887
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of Cold Positronium Atoms
Autorzy:
Brusa, R.
Mariazzi, S.
Consolati, G.
Dupasquier, A.
Quasso, F.
Giammarchi, M.
Powiązania:
https://bibliotekanauki.pl/articles/1812479.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
36.10.Dr
36.10.Gv
Opis:
Positronium will play a primary role in the next generation of antimatter experiments through the following antihydrogen production reaction: p̅ + Ps* → p̅e⁺ + e¯. In order to study antimatter physical properties (CPT (charge, parity, time) invariance and principle of equivalence test) it is necessary to keep this system at the lowest possible (sub-kelvin) temperatures. This requires the generation of a suitable flux of cold Ps atoms in a vacuum, a non-trivial requirement at the light of the present experimental results. In this paper we discuss the state of the actual knowledge on positronium formation and consequent emission from metallic surfaces and insulators and we show the opportunity to use suitable porous materials to cool positronium through collisions with the inner walls of the pores. We get a rough indication on the geometrical parameters of the pore and we propose a simple experiment to obtain the kinetic energy - and therefore the equivalent temperature - of emitted positronium without using a positron beam.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1301-1306
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Carbon Nanotubes Studied by Coincidence Doppler Broadening Spectroscopy
Autorzy:
Murakami, H.
Sato, K.
Kanazawa, I.
Sano, M.
Powiązania:
https://bibliotekanauki.pl/articles/1812544.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.Fg
78.70.Bj
36.10.Dr
Opis:
In order to assign the sites of positron annihilation, coincidence Doppler broadening spectra were measured for a highly oriented pyrolytic graphite crystal, graphite powder, multi-walled carbon nanotubes (MNTs) and cup-stacked carbon nanotubes (CNTs). The spectrum for graphite powder normalized to that for highly oriented pyrolytic graphite (HOPG) is almost flat in the momentum region from $7×10^{-3}$ to $13×10^{-3} m_{e}c$, having a ratio close to unity. The flat spectrum demonstrates that positrons injected into graphite powder annihilate in the interlayer spaces of piled graphite sheets, in the same manner as positrons in highly oriented pyrolytic graphite annihilate in the bulk. The coincidence Doppler broadening spectra for MNTs and CNTs are quite different from that for highly oriented pyrolytic graphite, which indicates that positrons injected into MNTs and CYTs annihilate not in the bulk, but on surface. The positron lifetime spectrum for multi-walled carbon nanotubes is analyzed in terms of a single component due to surface-trapped positrons, while that for CNTs is decomposed into three components attributable to para-positronium surface-trapped positrons and ortho-positronium. The difference between the coincidence Doppler broadening spectrum for CNTs and that for MNTs is explained in terms of positron annihilation on zigzag surfaces of CNTs which are composed of both graphite-sheet and graphite-edge planes.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1479-1484
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anisotropic Magnetic Quenching of Positronium Formed by Polarized Positrons in Oriented Crystals
Autorzy:
Bondarev, I. V.
Powiązania:
https://bibliotekanauki.pl/articles/2007885.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
71.60.+z
36.10.Dr
Opis:
A theoretical analysis is performed of the phenomenon of anisotropic magnetic quenching of a positronium atom formed by polarized positrons in noncubic crystals oriented with respect to an external magnetic field. An initial polarization of positrons is shown to enhance an anisotropy of Ps magnetic quenching and to decrease the strength of magnetic field in which an anisotropy is maximal. A maximal anisotropic effect has been estimated for quasi-Ps in crystalline quartz and Ps complex in naphthalene single crystal.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 455-460
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positronium in Metal-Oxide Powders Studied with Age. The Age-Momentum Correlation Technique
Autorzy:
Van Waeyenberge, B.
Dauwe, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/2028957.pdf
Data publikacji:
2001-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
41.75.Fr
78.70.Bj
Opis:
For the first time positronium is investigated in fine powders of MgO and Al$\text{}_{2}$O$\text{}_{3}$ using age-momentum correlation technique based on a relativistic positron beam. The application of this technique for investigating the interaction of positronium with the grain surfaces is discussed and compared with other techniques. The previously reported interaction of the positronium with paramagnetic centres is further studied. A qualitative interpretation of the spectra is given. In the Al$\text{}_{2}$O$\text{}_{3}$ samples we found some unexpected behaviour of the conversion quenching of ortho-positronium at irradiation induced paramagnetic surface defect.
Źródło:
Acta Physica Polonica A; 2001, 100, 5; 707-715
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positrons and Positroniu m in Grainy and Porous Solids
Autorzy:
Kajcsos, Zs.
Liszkay, L.
Duplâtre, G.
Varga, L.
Lázár, K.
Pál-Borbély, G.
Beyer, H.
Lohonyai, L.
Caullet, P.
Patarin, J.
Powiązania:
https://bibliotekanauki.pl/articles/2025110.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
36.10.Dr
61.43.Gt
Opis:
Systematic investigations have been performed using positron annihilation techniques on micrograins of crystalline powders (e.g., MgO, Al$\text{}_{2}$O$\text{}_{3}$, SiO$\text{}_{2}$) and on various zeolites (e.g., silicalite 1, Na-X, Na-Y, ZSM-5, mordenite) aiming at a better under standing of the formation and decay of the long-lived ortho-positronium states. The techniques were lifetime spectroscopy, Doppler-effect measurements and the recording of the full energy distribution of the annihilation radiation. The influences of heat treatment, sample evacuation and presence of gases were investigated. Lifetimes over 130 ns and o-Ps fractions of about 30% were found. A strong correlation of positron annihilation technique data with a water content of the samples was evidenced. Possible pictures of the formation and decay of ortho-positronium in porous media are discussed.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 399-406
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positronium Trapping in Porous Solids: Means and Limitations for Structural Studies
Autorzy:
Kajcsos, Zs.
Liszkay, L.
Duplâtre, G.
Varga, L.
Lohonyai, L.
Pászti, F.
Szilágyi, E.
Lázár, K.
Kótai, E.
Pál-Borbély, G.
Beyer, H. K.
Caullet, P.
Patarin, J.
Azenha, M. E.
Gordo, P. M.
Lopes Gil, C.
de Lima, A. P.
Ferreira Marques, M.
Powiązania:
https://bibliotekanauki.pl/articles/2042216.pdf
Data publikacji:
2005-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
78.70.Bj
61.43.Gt
Opis:
Positron annihilation techniques are used for the structural investigation of solids but the interpretation of results in grainy and porous media is still unclear. A unique picture can be obtained assuming that the dominant process is Ps trapping in competing "extended free volume" sites. In samples with a large amount of free volumes near-saturation Ps trapping will rule the lifetime pattern, and very long lifetimes of over 100 ns might arise from o-Ps trapped in mesopores. It is shown that lifetime parameters must be corrected for the 3γ/2γ counting efficiency ratio. The results demonstrate the high sensitivity of Ps to mesopores in zeolites but also that Ps-trapping poses limitations on the applicability of lifetime to structural investigation in porous systems. The evolution of the lifetime spectra upon changes in the sample and measuring conditions should be considered in a complex way, observing not only changes in some selected components but in the whole lifetime pattern simultaneously.
Źródło:
Acta Physica Polonica A; 2005, 107, 5; 729-737
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Primary Chemical Reactions Induced by Transformation of Radioactive Nuclei in Solids at Low Temperatures. Investigation by Means of the Emission Mössbauer and Positron Spectroscopies
Autorzy:
Byakov, V. M.
Kulikov, L. A.
Perfil'ev, Y. D.
Stepanov, S. V.
Powiązania:
https://bibliotekanauki.pl/articles/2043320.pdf
Data publikacji:
2005-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.Fe
36.10.Dr
78.70.Bj
Opis:
A set of early chemical reactions in grapes of ionization (blobs) arising in tracks of fast electrons and positrons in liquids as well as formed by the Auger electrons in frozen aqueous media around decaying Mössbauer $\text{}^{57}$Co or $\text{}^{119m}$Sn nuclei is suggested. The mechanism predicts a correlated variation of the formation probabilities of intrablob final products, namely Fe$\text{}^{2+}$-Fe$\text{}^{3+}$ or Sn$\text{}^{2+}$-Sn$\text{}^{4+}$ ions, positronium atom and molecular hydrogen with variation of temperature, degree of crystallinity, concentration of electron scavengers. These correlations indicate on similarity of chemical processes as in blobs created by $\text{}^{57}$Co and $\text{}^{119m}$Sn after their decay as well as in blobs produced in tracks of fast positrons and electrons.
Źródło:
Acta Physica Polonica A; 2005, 107, 5; 792-798
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Positron Irradiation on Positronium Formation in n-Alkanes
Autorzy:
Pietrow, M.
Zgardzińska, B.
Powiązania:
https://bibliotekanauki.pl/articles/2047152.pdf
Data publikacji:
2006-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
61.80.Fe
78.70.Bj
Opis:
Positronium formation probability was investigated as a function of irradiation time and temperature for some long-chain saturated hydrocarbons (alkanes). Intensity of ortho-positronium component in the lifetime spectrum depends on the concentration of trapped excess electrons, but also on concentration of radicals and ions acting as electron scavengers. The results indicate the existence of two kinds of electron traps; those which are not emptied by thermal treatment disappear after several days of positron irradiation.
Źródło:
Acta Physica Polonica A; 2006, 110, 5; 641-648
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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