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Tytuł:
Resonance Trapping of Positrons in Solids
Autorzy:
Dryzek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929062.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
Basing on a new approach to the calculations of the positron trapping rate, an attempt ',was made to explain the prevacancy effects observed in positron annihilation measurements in metals. The defect in the calculation is represented by a complex potential: the real part of it is responsible for the scattering and the imaginary part - for the trapping of incoming positrons. It is shown that the resonance trapping of the positron s-wave and p-wave at low temperature and d-wave and f-wave in prethermal regions provide substantial contributions to the trapping rate of positrons. The calculations were done for the point defect and for the dislocation, taking into account the thermal distribution of the positron energy and the thermal expansion of the crystal lattice. The resonance trapping of positrons could be responsible for prevacancy effects in metals and could help to solve some problems in the study of positron annihilation.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 293-296
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Trapping Model in Fine Grained Sample
Autorzy:
Dryzek, J.
Powiązania:
https://bibliotekanauki.pl/articles/2007999.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
In the paper we consider the positron trapping model in the sample where the spherical particles were immersed in the medium. The radius of the particles was small enough to take into account the diffusion of positrons. We present the exact solutions of the model for two cases, when transition of the positrons from the particle to the medium was neglected and when it was taken into consideration. The theoretical calculations were applied to description of the positron annihilation in the copper sample where the recrystallization process took place.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 539-545
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kwestia Utrum universale nihil sit aut posterius suis singularibus z zachowanych w rękopisie BJ 2118 Collectanea de anima
Question Utrum universale nihil sit aut posterius suis singularibus of the Collectanea de anima preserved in MS. BJ 2118
Autorzy:
Stanek, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2075170.pdf
Data publikacji:
2020-12-30
Wydawca:
Naukowe Towarzystwo Tomistyczne
Tematy:
O duszy
Uniwersytet Krakowski II połowy XV w.
uniwersalia
rkp. BJ 2118
On the soul
University of Krakow in the 2nd half of the 15th century
problem of universals
MS. BJ 2118
Opis:
Presented paper contains the critical edition of the question Utrum universal nihil sit aut posterius suis singularibus of the Collectanea de anima preserved in MS. BJ 2118. Collectanea de anima is a provisional title of the collection of 6 questions dealing with the problem of the soul, composed in Krakow in the 2nd half of the 15th century. This manual has a heterogenic character, since every question differs from the others regarding its form, multidimensionality of undertaken issues and the degree of doctrinal independence. Surely, the 3rd question edited here (precisely its part that has been preserved till today, i.e. the introduction and first passage of articulus 1) is not too original work and does not include any remarkable statements. But yet, it is an important testimony of work of compilers, that nowadays only uncommonly is a subject of studies. The edited text in general is doctrinally dependent: first of all, it is based on the works by Thomas Aquinas, Albert the Great and Alexander Bonini of Alexandria (the author explicitly quotes these sources), but also on treatises by Heymericus of Campo and Pseudo-Aquinas (their works are not induced by the author). Concerning the substance of the edited question, the most interesting and “original” is a kind of ignorance of the historical background of the problem of universals and the occurrence of quite numerous mistakes. Mostly they can be easily explained, since they often arise from improper decipheration of abbreviation, overinterpretation or basing on a corrupted source. The accumulated mistakes lead the author to draw his own (singular) conclusions, that all testify the correctness of the Aristotle’s sentence: Parvus error in principio maximus erit in fine.
Źródło:
Rocznik Tomistyczny; 2020, 2, 9; 229-237
2300-1976
Pojawia się w:
Rocznik Tomistyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annihilation of Positrons in Fe-Ni Alloys
Autorzy:
Szuszkiewicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1933545.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The effect of positron polarization on annihilation characteristics for ferromagnetic alloy samples, Fe$\text{}_{64}$Νi$\text{}_{36}$, Fe$\text{}_{63}$Νi$\text{}_{37}$, Fe$\text{}_{25}$Νi$\text{}_{75}$ and Fe$\text{}_{50}$Νi$\text{}_{50}$, has been studied. It was observed that the global two-quantum annihilation rate depends on mutual orientation of positron beam direction and the sample magnetization. The observed changes of the rate are opposite to the ones which could be expected from the effect of mutual orientation of positron and electron spins on positron backscattering. They can be explained as a result of changing of the relation between 3γ- and 2γ-annihilation probabilities.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 237-239
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:
Ortho-Positronium Annihilation in Room Temperature Ionic Liquids
Autorzy:
Hirade, T.
Powiązania:
https://bibliotekanauki.pl/articles/1030029.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
Very new phenomena have been found in room temperature ionic liquids, e.g. oscillation of positronium (Ps) bubble. It is almost impossible to see this kind of phenomenon in usual molecular liquids. The Ps bubble oscillations in N,N,N-trimethyl-N-propylammonium bis(trifluoro-methanesulfonyl)imide (TMPA-TFSI), N-methyl-N-propylpiperidinium bis(trifluoromethane-sulfonyl) imide (PP13-TFSI) and 1-ethyl-3-methylimidazolium thiocyanate (EMIM-SCN) were successfully observed. Even though the Ps bubble size is smaller for EMIM-SCN, the oscillation frequency of the Ps bubble at 10°C above the melting temperatures was quite similar for the other room temperature ionic liquids. Hence, the Ps bubble oscillation is, probably, caused by the repulsive force initiated by the ionic structures in room temperature ionic liquids that can remain at 10-15°C above the melting temperatures.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1470-1472
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of Sodium Silicate Cullets by Using Trona
Autorzy:
Özkan, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1398696.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.bj
Opis:
This study focuses on production and characterization of sodium silicate cullet by using trona. Sodium silicate cullets are generally produced by direct fusion of precisely measured portions of soda ash (Na₂CO₃) and quartz (SiO₂). In this study trona (Na₂CO₃· NaHCO₃· 2H₂O) was used as a source of soda ash. For this purpose trona sample was first characterized by X-ray diffraction, scanning electron microscopy, differential thermal analysis/thermal gravimetry and chemical analyses. Different batches were prepared and fused to produce sodium silicates varying in ratio Na₂O· nSiO₂. Produced samples were evaluated by X-ray diffraction and scanning electron microscopy. The results showed that trona can be used instead of soda ash to produce sodium silicate cullets.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 451-454
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Medical Substances of Insulin
Autorzy:
Pietrzak, R.
Szatanik, R.
Powiązania:
https://bibliotekanauki.pl/articles/2043341.pdf
Data publikacji:
2005-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
Positrons lifetimes were measured in medical substances of insulin (human and animal), differing as far as the degree of purity and time of their activity in the organism are concerned. In all of the cases the spectrum of positron lifetime was distributed into three components, with the long-life component ranging from 1.8 to 2.08 ns and the intensity taking on values from 18 to 24%. Making use of Tao-Eldrup model, the average radius of the free volume, in which o-Ps annihilated, and the degree of filling in the volume were determined. It was found that the value of the long-life component for human insulin is higher than that of animal insulin. Moreover, the value of this component clearly depends on the manner of purification of the insulin. It was also noticed that there occurs a correlation between the value of this component and the time after which it begins to be active in the organism, as well as the total time of its activity.
Źródło:
Acta Physica Polonica A; 2005, 107, 5; 852-856
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Obsidians
Autorzy:
Chojcan, J.
Sachanbiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1933482.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Fs
78.70.Bj
Opis:
Positron lifetime spectra as well as one-dimensional angular correlations of positron annihilation radiation were measured at room temperature for samples of rhyolitic obsidian coming from Iceland, Italy and Armenia. The samples were of different age. One specimen (originating from Iceland) was relatively young, formed in 1980. The others were much older, collected during the 19th century. It was found that the linear dimensions of pores trapping the positronium atoms before their decay as well as the pore concentration in all old obsidians are almost the same independently of the place of their formation. Simultaneously the concentration of the pores in the young sample is about five times lower than in the old specimens. Basing on the result it is suggested to extend the study in order to find out if positron annihilation can be used for the investigation of the age of the volcanic accumulations containing obsidian.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 103-110
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Helium Charged Ni Samples
Autorzy:
Pająk, J.
Rozenfeld, B.
Powiązania:
https://bibliotekanauki.pl/articles/1929108.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The angular correlation curves of annihilation quanta and isochronal annealing curves for the plastically deformed nickel samples charged with helium have been measured. The results indicate that helium is effectively trapped at crystal lattice defects and is released from them at the temperature below 350 K.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 371-374
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remarks on Reconstruction of Defects Distribution by Positron Lifetime Measurements
Autorzy:
Dryzek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1933485.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
It is well known that the positron trapping rate obtained from positron lifetime measurements depends upon defect concentrations and trapping efficiency. If a distribution of open volume defects exists, a distribution of trapping efficiency also could be present. As an example, the calculation of trapping efficiency as a function of radius of defects in Al is presented. The correct explanation of defect size distribution obtained by positron lifetime measurements needs to introduce some additional assumptions about trapping efficiency.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 125-128
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation Methods by Use of LSO Scintillators
Autorzy:
Hirade, T.
Oka, T.
Powiązania:
https://bibliotekanauki.pl/articles/1339992.pdf
Data publikacji:
2014-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
$Lu_2SiO_5$:Ce (LSO) scintillator is one of the scintillators used for positron emission tomography because of its high efficiency of gamma-ray detection. We tried to use LSO for positron annihilation lifetime and age-momentum correlation measurements because the high efficiency is needed to reduce the positron irradiation effect during measurements. The high efficiency with reasonable time resolution was successfully obtained by use of the dynode signals from photomultiplier tubes.
Źródło:
Acta Physica Polonica A; 2014, 125, 3; 825-828
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Internally Oxidized Copper
Autorzy:
Misheva, M.
Nancheva, N.
Feschiev, N.
Powiązania:
https://bibliotekanauki.pl/articles/1929106.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The positron lifetimes in internally oxidized polycrystalline copper, annealed at different temperatures, were measured. It was found that the dispersed alumina particles act as positron traps. Estimation of concentration of defects was made in the frames of the trapping model.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 365-369
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Defects in Some Hydrogenated Metallic Materials Studied by Positrons
Autorzy:
Mikhalenkov, V. S.
Powiązania:
https://bibliotekanauki.pl/articles/2024976.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The measurements of angular correlation of annihilation radiation and positron lifetime were performed to study defects in commercial stainless steel and nickel subjected to deformation and electron irradiation. It follows from variation of S-parameter derived from angular correlation of annihilation radiation spectra that hydrogen charging of Fe-Cr-Ni-Mn austenite steel results in appearance of modest amount of vacancies which agglomerate into small clusters during annealing at low temperatures. Electron irradiation produces much more defects, so that subsequent hydrogenation does not add much to their concentration. The major part of defects anneals out gradually to 700 K. The residual part is preserved up to 950 K. This fact testifies to bonding state of vacancies. Nickel of 3N purity was prepared in three initial states, i.e. cold-rolled and hydrogenated before and after deformation. In an initial state all samples contain, along with simple defects, vacancy clusters. Their size and concentration are much larger in hydrogenated samples, as compared with merely cold-rolled one. Annealing above 400 K causes growth of cluster size and decrease in their concentration. At 500 K clusters are observed to disappear in cold-rolled sample, while in the sample hydrogenated after deformation they survive to 600 K.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 415-422
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements of Positrons Lifetimes in Corroded Nickel
Autorzy:
Pietrzak, R.
Szatanik, R.
Szuszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2008182.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
An attempt was undertaken at making use of a technique of taking measurements of lifetimes of positrons emitted from $\text{}^{22}$Na source to investigate corroded nickel. It was found that after corrosion in HCl vapours mean positrons lifetime, the second component of positrons lifetimes as well as its intensity rise along with the corrosion time.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 647-651
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Edycja fragmentu komentarza do Etyki nikomachejskiej (BJ 741) Pawła z Worczyna
The edition of the fragment of the commentary on Pauls of Worczin "Nicomachean Ethics" (BJ 741)
Autorzy:
Brodzik, Paulina
Poręcki, Michał
Płotka, Magdalena
Szczęśniak, Hanna
Tustanowska, Anna
Serafińska, Jurata Bogna
Powiązania:
https://bibliotekanauki.pl/articles/452424.pdf
Data publikacji:
2012
Wydawca:
Naukowe Towarzystwo Tomistyczne
Źródło:
Rocznik Tomistyczny; 2012, 1; 203-205
2300-1976
Pojawia się w:
Rocznik Tomistyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation Study of Defects in the Cage-Type Uranium Compound
Autorzy:
Rubaszek, A.
Powiązania:
https://bibliotekanauki.pl/articles/1336614.pdf
Data publikacji:
2014-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The electron and positron properties of the $UIr_2Zn_{20}$ compound of the Fd-3m cage-type crystal structure are studied. The characteristics for the perfect crystal are compared with their counterparts in the elements containing Ir and Zn vacancy. The presence of the vacancy hardly influences the electron charge density around individual atoms. In contrast to electrons, the positron is strongly localized inside the vacancy and the transfer of positron charge is observed. The positron lifetime, τ, appears to be strongly sensitive to the presence and type of the vacancy. Furthermore, this parameter calculated for the perfect crystal is very close to the experimental value for Zn. Here the theoretical values of τ depend on the approach applied to the electron positron (e-p) correlations.
Źródło:
Acta Physica Polonica A; 2014, 125, 3; 737-740
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Tektite and Hyalite
Autorzy:
Chojcan, J.
Sachanbiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1928968.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Fs
78.70.Bj
Opis:
Positron lifetime spectra as well as one-dimensional angular distributions of photons coming from the two-photon annihilation of an electron-positron pair were measured at room temperature for samples of natural tektite and hyalite. The data were used for estimation of positronium characteristics in the specimens. The characteristics were analysed in terms of parameters of pores trapping the positronium atoms before their decay. In the analysis two models of the traps were taken into account, i.e. the square potential wells of spherical symmetry with barriers of finite and infinite heights. It was found that the linear dimensions of the pores resulting from these two-trap models are almost the same and they are of the order of 1 nm.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 267-271
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recent Developments of the Bloch-Modified Ladder Theory
Autorzy:
Sormann, H.
Powiązania:
https://bibliotekanauki.pl/articles/1929111.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
71.25.Pi
Opis:
One of the possible theoretical approaches for desribing the physics of electron-positron pairs in the inhomogeneous electron gas is the so-called "quasi-free" Bloch-modified ladder theory. Despite the success of this approach, it contains two very serious deficiencies, namely the complete neglect of the Bloch character of the electron and positron scattering states and of the electron-positron interaction potential. In this contribution, the importance of these Bloch effects for the Bloch-modified ladder theory results, especially for the momentum dependence of the positron enhancement in d-band metals, is demonstrated for the first time.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 381-390
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consistency and Symmetry Conditions for Plane Projections
Autorzy:
Kontrym-Sznajd, G.
Powiązania:
https://bibliotekanauki.pl/articles/2008079.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
78.70.Bj
Opis:
Interdependences between plane projections of densities ρ(p) for various crystallographical structures are derived from the conditions of both the consistency and symmetry of projections. Some additional relations are obtained by treating plane projections as line projections of ρ̃$\text{}_{L}$(p) (ρ̃$\text{}_{L}$ is a line projection of ρ(p)) and using the consistency and symmetry conditions for the line projections. The relations found can be utilized for both an improvement of experimental spectra and a verification of various techniques used for e.g. correcting Compton profiles.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 581-585
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of Positron Implantation Profile in Different Materials
Autorzy:
Dryzek, J.
Powiązania:
https://bibliotekanauki.pl/articles/2042176.pdf
Data publikacji:
2005-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ji
78.70.Bj
Opis:
The objective of this paper is experimental studies of the linear absorption coefficient, or mean penetration depth of positrons emitted from $\text{}^{22}$Na isotope in different materials. For this purpose we constructed a new experimental setup which allows us to scan the depth implantation profile of positrons. For the studied metals: Mg, Al, the obtained values of mean penetration depth coincide well with those which can be calculated using the mathematical formula commonly used but for Si and S the discrepancy has been observed similarly like for polymers.
Źródło:
Acta Physica Polonica A; 2005, 107, 4; 598-607
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free Volume in Plastified Poly(Vinyl Chlorate)
Autorzy:
Borek, J.
Osoba, W.
Powiązania:
https://bibliotekanauki.pl/articles/1933477.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.60.+z
78.70.Bj
Opis:
Positron lifetimes measurements in pure poly(vinyl chlorate) (PVC) and in plastified PVC were performed. Three different plasticizers were used: dibutyl phtalate, dioctyl phtalate and tricresyl phosphate. The measured samples were prepared of PVC with two different plasticizers concentration (20% and 30% of the plasticizers in the poly(vinyl chlorate)). All the measurements were performed in air at room temperature. A conventional fast-slow coincidence lifetime spectrometer was used for the measurements. Free volume radii were calculated from the lifetime data.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 91-95
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Screening of a Positron in An Inhomogeneous Electron Gas
Autorzy:
Stachowiak, H.
Powiązania:
https://bibliotekanauki.pl/articles/2008186.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
71.60.+z
Opis:
Calculations of the local annihilation rate of positrons in inhomogeneous media have been recently performed. However, the problem was solved only for the positron at the center of the inhomogeneity. This allowed to benefit of the spherical symmetry of the problem. Since the positron is usually an itinerant particle, it is necessary in practical applications to perform computations for every possible coordinates of this particle. In the present work local annihilation rates were obtained for noncentral coordinates of the positron.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 663-670
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Cotton Cellulose
Autorzy:
Golonka, P.
Mayer, J.
Dryzek, E.
Powiązania:
https://bibliotekanauki.pl/articles/2024232.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
42.70.Jk
Opis:
The changes of the cotton fibre microstructure as a result of annealing at temperatures from 20ºC to 300ºC were investigated by positron lifetime spectroscopy and differential scanning calorimetry. The aim of the paper was to examine the cotton cellulose thermal degradation process.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 363-367
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Aspects of Positronium Interaction with Elementary Free Volumes in Polymers
Autorzy:
Shantarovich, V. P.
Powiązania:
https://bibliotekanauki.pl/articles/2025763.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
This paper contains a discussion of original and recently published results on positronium annihilation lifetime studies of elementary free volumes in the group of polymer glasses. The results are used for indication of non-homogeneity of these materials and give some basis for considering a connection of the long-lived component intensities I$\text{}_{3}$(I$\text{}_{4}$) with concentrations N$\text{}_{3}$(N$\text{}_{4}$) of elementary free volumes and, in this way, with fractional free volume.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 487-495
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative anatomy of ovules in Galinsoga, Solidago and Ratibida (Asteraceae)
Autorzy:
Kolczyk, J.
Stolarczyk, P.
Plachno, B.J.
Powiązania:
https://bibliotekanauki.pl/articles/19394.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2014, 56, 2
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrogen-Induced Defects in Palladium
Autorzy:
Melikhova, O.
Čížek, J.
Procházka, I.
Powiązania:
https://bibliotekanauki.pl/articles/1338026.pdf
Data publikacji:
2014-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
61.72.-y
Opis:
In the present work positron annihilation spectroscopy was employed for investigation of hydrogen-induced defects in Pd. Well annealed Pd samples were electrochemically charged with hydrogen and development of defects with increasing hydrogen concentration $x_{H}$ was investigated. At low concentrations (α-phase, $x_{H}$ < 0.017 H/Pd) hydrogen loading introduced vacancies, since absorbed hydrogen segregating at vacancies lowers remarkably the vacancy formation energy. When hydrogen concentration exceeds 0.017 H/Pd, particles of palladium hydride (PdH) are formed. Stress induced by growing PdH particles leads to plastic deformation which generates dislocations and vacancies in the sample.
Źródło:
Acta Physica Polonica A; 2014, 125, 3; 752-755
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:
Positron Annihilation Studies of the Subsurface Zone in Aluminium Alloys
Autorzy:
Dryzek, E.
Dryzek, J.
Powiązania:
https://bibliotekanauki.pl/articles/2047123.pdf
Data publikacji:
2006-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The paper presents positron lifetime studies of the subsurface region of the aluminium cast AK64 alloy containing silicon as a main alloying element after sliding against stainless steel in the pin-on-disc tester. The subsurface zone of the depth exceeding 150μm has been detected. The scanning electron microscopy revealed only the plastically deformed region occurring at the depth up to ca. 50μm and cracks at the depth less than 30μm. The comparison with the results obtained for the AK12 alloy containing almost a twice higher amount of silicon demonstrates the influence of the hard silicon rich particles on the total depth of the subsurface zone. A higher amount of hard particle prevents to some extend the propagation of defects inside the material.
Źródło:
Acta Physica Polonica A; 2006, 110, 5; 569-575
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ovule structure of Scotch thistle Onopordum acanthium L. (Cynareae, Asteraceae)
Autorzy:
Kolczyk, J.
Stolarczyk, P.
Plachno, B.J.
Powiązania:
https://bibliotekanauki.pl/articles/19788.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Studies concerning the ultrastructure of the periendothelial zone integumentary cells of Asteraceae species are scarce. The aim was to check whether and/or what kinds of integument modifications occur in Onopordum acanthium. Ovule structure was investigated using light microscopy, scanning electron microscopy, transmission electron microscopy and histochemistry. For visualization of calcium oxalate crystals, the polarizing microscopy was used. The periendothelial zone of integument in O. acanthium is well developed and composed of mucilage cells near the integumentary tapetum and large, highly vacuolated cells at the chalaza and therefore they differ from other integumentary cells. The cells of this zone lack starch and protein bodies. Periendothelial zone cells do not have calcium oxalate crystals, in contrast to other integument cells. The disintegration of periendothelial zone cells was observed in a mature ovule. The general ovule structure of O. acanthium is similar to other members of the subfamily Carduoideae, although it is different to “Taraxacum”, “Galinsoga” and “Ratibida” ovule types.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2016, 58, 1
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of the Cu-Mn System
Autorzy:
Nicht, E.-M.
Brauer, G.
Kajcsos, Zs.
Molnar, B.
Powiązania:
https://bibliotekanauki.pl/articles/1933529.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The superstructures Cu$\text{}_{3}$Mn and Cu$\text{}_{5}$Mn have been characterized for the first time by X-ray and differential scanning calorimetry measurements. In addition, positron lifetime measurements are presented in order to show the defect structure of these alloys. It turned out that the annealing behaviour is equal for the two different alloys and the two different deforming processes. An annealing temperature of 300°C is not sufficient to obtain a defect free state.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 205-210
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consistency and Symmetry Conditions for Line Projections
Autorzy:
Kontrym-Sznajd, G.
Jura, A.
Powiązania:
https://bibliotekanauki.pl/articles/2008102.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
78.70.Bj
Opis:
We present some relations between experimental spectra representing line projections of electronic densities in the momentum space. All spectra which are the projections of the same density, must be interdependent. It can be derived from the consistency condition and symmetry of the line projections. The knowledge of these dependences, found in the paper, can be utilised for an improvement of experimental data as e.g. two-dimensional angular correlation of positron annihilation spectra.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 586-590
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in p-Terphenyl Doped with Benzofluorene
Autorzy:
Goworek, T.
Rybka, C.
Powiązania:
https://bibliotekanauki.pl/articles/2024234.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
31.70.Ks
Opis:
In earlier measurements of momentum distribution of annihilating e$\text{}^{+}$e$\text{}^{-}$ pairs the intensity of o-Ps component seemed to be much higher than that expected from the lifetime data. In this paper we show that such a deviation disappears if one assumes that the pick-off component of angular correlation of annihilation radiation is narrower by 10% than the component related to free annihilation.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 369-371
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:
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:
Performance of a High-Resolution Digital Positron-Lifetime Spectrometer
Autorzy:
Bečvář, F.
Čížek, J.
Procházka, I.
Powiązania:
https://bibliotekanauki.pl/articles/1812465.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
This work describes a digital positron-lifetime spectrometer based on two ultrafast digitizers. Performance of the digital spectrometer in conditions of a routine measurement is compared with an analogue setup connected to the same detectors. It was found that engagement of the digital setup leads to an improvement of timing resolution (FWHM for $\text{}^{22}Na$) from 169 ps for the traditional analogue setup to 146 ps for the digital setup. The coincidence count rate for 1.2 MBq $\text{}^{22}Na$ source is 75-80 coinc./s for both configurations. These results clearly demonstrate the advantages of the digital timing over the traditional analogue setup.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1279-1284
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electroni-Positron Scattering in Real Metals
Autorzy:
Boroński, E.
Daniuk, S.
Stachowiak, H.
Powiązania:
https://bibliotekanauki.pl/articles/1928926.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
71.60.+z
Opis:
The purpose of the paper is to point at the importance of some detailed studies of electron-positron scattering in real metals using wave functions obtained from band structure calculations. In this work some preliminary investigations of the matrix elements of electron-positron scattering, e.g. the transitions from occupied to non-occupied states close to the Fermi surface are presented. One can observe that for s → s transitions of the positron (s, p are orbital quantum numbers) electrons do not change their orbital quantum numbers but for s → p transitions of the positron, electron quantum numbers change by unity.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 255-260
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron-Positron Interaction in Metals. Theory and Experiment
Autorzy:
Stachowiak, H.
Boroński, E.
Powiązania:
https://bibliotekanauki.pl/articles/2042125.pdf
Data publikacji:
2005-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.60.+z
78.70.Bj
Opis:
The electron-positron interaction greatly complicates the interpretation of positron annihilation data. The two-detector Doppler measurements of Mijnarends et al. as well as our theoretical calculations point at the conclusion that the local density approximation to e$\text{}^{+}$-e$\text{}^{-}$ interaction is a good way of treating this problem in real metals, at least the simplest ones. This shows that e$\text{}^{+}$-e$\text{}^{-}$ interaction in an electron gas is the key to understanding this phenomenon also in inhomogeneous systems. On the basis of dozens of experiments one comes to the conclusion that the well known formula of Boroński and Nieminen for the electron accumulation on the positron in jellium describes the best the positron lifetimes in metals. However, it is based on the calculations of Lantto which start from a physically oversimplified trial function. The results of Arponen and Pajanne, of Rubaszek and Stachowiak, and of Stachowiak and Lach lead to too short positron lifetimes in spite of using less controversial assumptions. The discrepancy is of the order of 8 to 15% for r$\text{}_{s}$=2. This shows that we still do not fully understand e$\text{}^{+}$-e$\text{}^{-}$ interaction even in an electron gas.
Źródło:
Acta Physica Polonica A; 2005, 107, 4; 541-553
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystallization Process in Porous and Nonporous Vycor Glass
Autorzy:
Jasińska, B.
Dawidowicz, A. L.
Pikus, S.
Powiązania:
https://bibliotekanauki.pl/articles/2042215.pdf
Data publikacji:
2005-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
Three stages of thermal and chemical processing of Vycor glass were carried out. Raw material, the glass with small and big pores was studied. In each stage of study various crystallinity degrees of investigated material were obtained. The relation between crystallinity degree and the intensity of o-Ps components was determined. In nonporous material a high correlation between o-Ps intensity and crystallinity degree was found. In porous material the decrease in total o-Ps intensity can be a measure of the crystallinity degree.
Źródło:
Acta Physica Polonica A; 2005, 107, 5; 724-728
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Defects Associated with Nanostructures in AlZnMg and AlCu(Mg) Alloys
Autorzy:
Ferragut, R.
Powiązania:
https://bibliotekanauki.pl/articles/2043315.pdf
Data publikacji:
2005-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
81.40.Cd
Opis:
The present work reports on a positron annihilation study addressing the structural and chemical characterization of solute aggregates containing open volumes (vacancies and/or misfit regions at precipitate-matrix interfaces) in AlZnMg, AlCu, and AlCuMg alloys. High resolution transmission electron microscopy results for selected ageing conditions are also presented. Two main points are discussed: (i) differentiation of the origin of hardening during artificial ageing between the AlZnMg and AlCu(Mg) alloy systems; (ii) structural origin of secondary ageing at low temperature, after a few minutes of high temperature exposure. It is shown that in AlZnMg alloys hardening at a high temperature is concomitant with the loss of coherency; on the contrary, in AlCu(Mg) alloys hardening is associated with coherent structures. Positron lifetime and coincidence Doppler broadening data taken during secondary ageing indicate that the residual solute supersaturation leads to the formation of coherent Zn-Mg-v (or Cu-Mg-v) aggregates.
Źródło:
Acta Physica Polonica A; 2005, 107, 5; 776-783
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Defected Monocrystalline Gold Samples
Autorzy:
Pająk, J.
Rudzińska, W.
Szuszkiewicz, M.
Garłowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2043340.pdf
Data publikacji:
2005-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
Angular distribution of the positron annihilation quanta was measured for monocrystalline gold samples, oriented in (110) and (111) directions. The samples were deformed by elongation for different deformation degrees. The S and W parameters as a function of deformation degree of the sample were determined. It was found that the dynamics of the dislocations and vacancy generation during the sliding of some crystallographic planes, depends on the crystallographic direction.
Źródło:
Acta Physica Polonica A; 2005, 107, 5; 848-851
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation Studies of the Ni-H Systems Containing Thermally Induced Crystal Lattice Defects
Autorzy:
Pająk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1933538.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The interaction between hydrogen and thermally induced defects has been studied in nickel samples using the positron annihilation technique. From measurements further evidence has been found for agglomeration of vacancies and small vacancy complexes into large-size three-dimensional void-like defects in the plastically deformed and electron beam irradiated samples containing hydrogen.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 219-223
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effective Electron-Positron Potential in Jellium
Autorzy:
Stachowiak, H.
Boroński, E.
Lach, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929114.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
71.60.+z
Opis:
One of the methods of determining theoretical annihilation characteristics in real metals is the approximation called Bloch modified ladder approach. In this approach a Bethe-Goldstone type equation is solved with an effective electron-positron potential obtained previously for jellium of the corresponding electron density. If one wishes to include the dependence on the local electron density of the e$\text{}^{+}$-e$\text{}^{-}$ effective potential in this formalism, it is necessary to know this potential for jellium, for metallic and above metallic densities. A review of different proposed e$\text{}^{+}$-e$\text{}^{-}$ potentials is presented and their correctness is evaluated from the point of view of their application in a Bethe-Goldstone type formalism which is the jellium analogue of Bloch modified ladder approach.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 391-394
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positronium in Small and Large Voids in Vycor Glass
Autorzy:
Ciesielski, K.
Dawidowicz, A. L.
Goworek, T.
Powiązania:
https://bibliotekanauki.pl/articles/2007951.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The intensities of ortho-positronium components related to the pores and to small voids in the bulk were determined for a series of Vycor glasses. The ratio of "pore fraction" to the total o-Ps yield depends on the specific surface area of the porous medium. The diffusion coefficient for o-Ps was found equal to 3.7×10$\text{}^{-5}$ cm$\text{}^{2}$/s.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 483-486
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Deformed and Hydrogenated Pd-23%atcu Alloy
Autorzy:
Pająk, J.
Szatanik, R.
Szuszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2008180.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
Peak coincidence counting rate and positron lifetime spectra for deformed by cold-rolling, and annealed by four hours in the temperature 973 K, hydrogen free and hydrogenated PdCu with 23% Cu samples, in the temperature range from room temperature to about 720 K were measured. It was found that hydrogen improved to tempered samples creates defects that are annealed to the temperature about 525 K. In the cold-rolled up to deformation degree of 50% samples, hydrogen is trapped at defects, probably vacancies, forming H-V complexes, that become disappearing in the vicinity of the temperature at 350 K.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 637-640
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Can Tao-Eldrup Model Be Used at Short o-Ps Lifetime?
Autorzy:
Zgardzińska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1196041.pdf
Data publikacji:
2014-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
14.60.Cd
Opis:
The distortion of estimated void radii introduced by assumption of an infinite potential depth in the Tao-Eldrup model is discussed. If the deviation by 10% is still acceptable, the range of ortho-Ps lifetimes at which the model gives correct radii is from 1.8 to 6.2 ns.
Źródło:
Acta Physica Polonica A; 2014, 125, 3; 700-701
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanopores in Silica Aerogels
Autorzy:
Šauša, O.
Iskrová, M.
Majerník, V.
Krištiak, J.
Jesenák, K.
Vargová, M.
Powiązania:
https://bibliotekanauki.pl/articles/1812550.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The size of nanopores in thermally treated samples of silica aerogels was determined by ortho-positronium lifetime measurements at room temperature. The annealing of samples in the temperature region of 300-800°C does not make substantial changes in pore size felt by positronium. The annealing at higher temperatures from an interval of 800-1050°C causes shrinkage of the samples reducing the pore size to 1-15 nm. The macropores vanish at temperature treatment at 1000°C and the positron annihilation is not affected by oxygen from air.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1517-1522
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tipi sintattici di proverbi toscani del ms. BJ 7198 della Biblioteca Jagellonica di Cracovia
Analiza składniowa toskańskich przysłów z rękopisu BJ 7198 z Biblioteki Jagiellońskiej w Krakowie
Autorzy:
Strugała, Sandra
Powiązania:
https://bibliotekanauki.pl/articles/521297.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
proverbi
analisi sintattica
raccolte di proverbi toscani
sintassi del proverbio
przysłowia
analiza składniowa
zbiór przysłów toskańskich
kładnia przysłowia
Opis:
Nel seguente intervento ci si propone di analizzare in chiave sintattica alcuni proverbi italiani provenienti da una raccolta cinquecentesca, depositata presso la Biblioteca Jagellonica di Cracovia. Il lavoro intrapreso, oltre alla definizione del proverbio e alla descrizione della sua tipologia e delle sue funzioni principali, include anche la classificazione dei proverbi di tipo sintattico. La raccolta toscana, conservata nel ms. BJ 7198, raggruppata per temi, viene presentata qui per la prima volta attraverso una descrizione fisica del codice e un breve commento relativo alla sua storia e alla sua lingua.
W niniejszym artykule autorka analizuje włoskie przysłowia przy użyciu kryterium syntaktycznego. Korpus badań stanowią przysłowia zawarte w XV-wiecznej kolekcji przechowywanej w Bibliotece Jagiellońskiej w Krakowie pod sygnaturą BJ 7198. Oprócz przedstawienia definicji przysłowia, opisu jego typologii i krótkiej charakterystyki, autorka proponuje klasyfikację analizowanych przysłów ze względu na ich składnię. Ponadto rękopis stanowiący korpus analizy zostaje po raz pierwszy przedstawiony odbiorcy poprzez opis fizyczny oraz krótki rys historyczny i komentarz językowy.
Źródło:
Annales Universitatis Paedagogicae Cracoviensis. Studia de Cultura; 2017, 9, 3; 124-132
2083-7275
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis. Studia de Cultura
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
Wyświetlanie 1-50 z 371

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