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Wyświetlanie 1-15 z 35
Tytuł:
Correlation femtoscopy
Autorzy:
Lednický, R.
Powiązania:
https://bibliotekanauki.pl/articles/147326.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
particle
emission
correlations
spin
flow
delay
interaction
Opis:
Recent results on particle momentum and spin correlations are discussed, particularly, in view of the role played by the effect of final state interaction. It is demonstrated that this effect allows for (i) correlation femtoscopy with unlike particles; (ii) study of the relative space-time asymmetries in the production of different particle species (e.g., relative time delays or spatial shifts due to collective flows); (iii) study of the particle strong interaction hardly accessible by other means (e.g., in logical and logical and system).
Źródło:
Nukleonika; 2004, 49,suppl.2; 3-6
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overview of the application of laser - based techniques in plasma - wall interaction research program at IFPiLM
Autorzy:
Kubkowska, M.
Gąsior, P.
Czarnecka, A.
Rosiński, M.
Wołowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/147816.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
plasma-wall interaction
plasma spectroscopy
laser-induced breakdown spectroscopy (LIBS)
Opis:
The purpose of this paper is to give an overview of the progress in the application of the laser-based techniques which has been achieved in the research in the field of plasma-wall interaction (PWI) at the Division of Laser-Produced Plasmas (DLPP), Institute of Plasma Physics and Laser Microfusion (IFPiLM, Warsaw, Poland) since 2005. The evolution of the experimental set-up which started in a simple configuration for the laser ablative co-deposit removal is presented with stress on the milestones which led to subsequent modifications, namely installation of laser induced breakdown spectroscopy (LIBS), fast HR (high resolution) CCDs, pulsed fiber-laser and the common triggering system.
Źródło:
Nukleonika; 2012, 57, 2; 163-166
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and hyperfine interaction in YbFe4Al8 compound
Autorzy:
Gaczyński, P.
Drulis, H.
Powiązania:
https://bibliotekanauki.pl/articles/147203.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer effect
rare earth
iron compounds
Opis:
57Fe Mössbauer spectra of YbFe4Al8 of the tetragonal ThMn12 structure have been investigated. Mössbauer measurements at the lowest temperatures yield information on the iron population in three crystallographic sites 8f, 8j and 8i available for Fe atoms. The obtained results indicate on the coexistence of magnetically ordered and paramagnetic-like Fe moments within antiferromagnetic phase of YbFe4Al8. The MS measurements show that the onset of short range antiferromagnetic interaction in the Fe sublattice takes place at 220 K.
Źródło:
Nukleonika; 2004, 49,suppl.3; 33-36
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of gamma irradiation on plants in interaction with arbuscular mycorrhizae
Autorzy:
Ene, M.
Trandafir, L.
Alexandru, M.
Powiązania:
https://bibliotekanauki.pl/articles/148043.pdf
Data publikacji:
2009
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
tomato
mutant
gamma irradiation
mycorrhiza defective
Opis:
Arbuscular mycorrhizae are endogenous fungi that form symbiotic association with the vast majority of vascular plants. They help to increase the nutrient uptake, especially phosphorus and to exploit a larger area of soil. Also, they improve soil aggregation, contribute to nutrient cycling processes in plants and improve their tolerance of heavy metal contamination or drought, as well as their susceptibility to root pathogens or herbivores. These fungi colonize the root epidermis and outer cortical layers and release bioactive molecules. The transcriptome and the proteome of plants are substantially altered. They have evolved multiple mechanisms that result in improvements in plant resistance to disease and plant growth and productivity, being included in a lot of combination of biofertilizers. In order to study these mechanisms, gamma irradiation was used to create mutants that are defective in their association. Culture under in vitro conditions is presented as method for maintaining the useful mutants in pure line.
Źródło:
Nukleonika; 2009, 54, 2; 89-92
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strangeness conservation and pair correlations of neutral kaons with close momenta in inclusive processes
Autorzy:
Lyuboshitz, V.
Powiązania:
https://bibliotekanauki.pl/articles/148469.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
correlations
strangeness
neutral K mesons
identity
final-state interaction
Opis:
The phenomenological structure of inclusive cross sections of the production of two neutral K-mesons in collisions of hadrons and nuclei is investigated taking into account the strangeness conservation in strong and electromagnetic interactions. The relations describing the dependence of the correlations of two short-lived and two long-lived neutral kaons KS0KS0, KL0KL0 and the correlations of “mixed” pairs KS0KL0 at small relative momenta upon the space-time parameters of the generation region of K0- and (anti)K0-mesons, which involve the contributions of Bose-statistics and S-wave strong final-state interaction, have been obtained. It is shown that under the strangeness conservation the correlation functions of the pairs KS0KS0 and KL0KL0, produced in the same inclusive process, coincide, and the difference between the correlation functions of the pairs KS0KS0 and KS0KL0 is conditioned by the production of the pairs of non-identical neutral kaons K0(anti)K0.
Źródło:
Nukleonika; 2006, 51,suppl.3; 69-72
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transient induced molecular negative ions formed in cold electron collisions with polarized molecules
Autorzy:
Toader, E. I.
Graham, W. G.
Powiązania:
https://bibliotekanauki.pl/articles/147748.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
interaction processes in plasmas
new negative molecular ions
Opis:
Using a relatively simple semiclassical model, it is shown that transient, induced molecular negative ions (TIMNI), are produced through a potential barrier interaction between cold electron collisions and polarizable molecules in plasma. Such new negative ions lead to radio-frequency absorption in such discharges. The calculated radio-frequency absorption frequencies are consistent with earlier experimental measurements.
Źródło:
Nukleonika; 2008, 53, 3; 123-126
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The acid-catalyzed interaction of melanin with nitrite ions : an EPR investigation
Autorzy:
Matuszak, Z.
Chignell, C. F.
Reszka, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/146912.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
EPR
melanin
nitrite
nitrogen dioxide
nitrous acid
radicals
Opis:
The interaction of synthetic dihydroxyphenylalanine (DOPA) melanin (DM) with nitrite ions, NO2 –, in the pH 3.6–7.0 range, has been investigated using electron paramagnetic resonance (EPR). We found that especially at pH <5.5 (from ca. 5.5 to 3.6) the reaction of DM with nitrite generated large quantities of new melanin radicals, which implies the involvement of nitrous acid, HNO2, in the radical formation process. Measurements carried out at constant pH of 3.6 showed that the melanin signal increased together with nitrite concentration, reaching a plateau level which was more than fourfold larger compared to the initial signal amplitude observed in a nitrite-free buffer of the same pH. The effects of nitrite and DM concentrations on the melanin-free radical content were also investigated. It is proposed that the radicals are generated by one electron oxidation of melanin ortho-hydroquinone groups to ortho-semiquinones by HNO2 or related nitrogen oxides such as NO2 • radicals. The possible involvement of nitric oxide (•NO) and peroxynitrite (ONOO–) in DM oxidation was also examined. In air-free solutions, nitric oxide per se did not generate melanin radicals; however, in the presence of oxygen a marked increase in the melanin EPR signal intensity was observed. This result is interpreted in terms of the generation of radicals via the oxidation of DM by peroxynitrite. Our fi ndings suggest that melanin can function as a natural scavenger of nitrous acid and some nitrous acid-derived species. This property may be relevant to physiological functions of melanin pigments in vivo.
Źródło:
Nukleonika; 2015, 60, No. 3, part 1; 475-481
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on fast electron transport in the context of fast ignition
Autorzy:
Batani, D.
Powiązania:
https://bibliotekanauki.pl/articles/146597.pdf
Data publikacji:
2011
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
inertial confinement fusion (ICF)
fast ignition (FI)
fast electrons
ultra-high-intensity lasers
relativistic laser-plasma interaction
Opis:
This paper deals with the problem of fast electron propagation in plasmas, in the context of the fast ignition (FI) approach to inertial confinement fusion (ICF). In FI, a short-pulse high-intensity laser beam should generate a beam of relativistic electrons, which propagate into the compressed pellet, depositing energy and igniting the fuel. The study of electron propagation in dense matter is hence essential to the success of this scheme. The propagation of relativistic electrons in dense matter is determined by collisions of fast electrons with ions and electrons in the material, which can be described in terms of stopping power, but it also depends on self-generated magnetic and electric fields, which play a major, or even dominant role. In this paper we will show the importance of such collective effects by discussing several experimental examples.
Źródło:
Nukleonika; 2011, 56, 2; 99-106
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Incomplete energy deposition in long CsI(Tl) crystals
Autorzy:
Siwek, A.
Budzanowski, A.
Czech, B.
Fomichev, A.
Gburek, T.
Rodin, A.
Skwirczynska, I.
Wolski, R.
Powiązania:
https://bibliotekanauki.pl/articles/147049.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
nuclear interaction in solids
scintillation detectors
Opis:
We studied process of incomplete energy deposition in long CsI(Tl) crystals, caused by inelastic interactions of impinging nuclear fragment in the scintillating material. The secondary beam from the ACCULINNA fragment separator and the heavy-ion beam from the CELSIUS storage ring were used to measure the yield of this process as a function of the initial energy of incoming fragments. The functional fit to GEANT simulations will be used to correct the energy spectra from future experiments.
Źródło:
Nukleonika; 2002, 47, 4; 141-145
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic and dynamical properties of dense ICF plasma
Autorzy:
Gabdullin, M. T.
Kodanova, S. K.
Ramazanov, T. S.
Issanova, M. K.
Ismagambetova, T. N.
Powiązania:
https://bibliotekanauki.pl/articles/146117.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Coulomb logarithm
effective interaction potential
equation of state
stopping power
Opis:
In present work, thermodynamic expressions were obtained through potentials that took into consideration long-range many-particle screening effects as well as short-range quantum-mechanical effects and radial distribution functions (RDFs). Stopping power of the projectile ions in dense, non-isothermal plasma was considered. One of the important values that describe the stopping power of the ions in plasma is the Coulomb logarithm. We investigated the stopping power of ions in inertial confi nement fusion (ICF) plasma and other energetic characteristics of fuel. Calculations of ions energy losses in the plasma for different values of the temperature and plasma density were carried out. A comparison of the calculated data of ion stopping power and energy deposition with experimental and theoretical results of other authors was also performed.
Źródło:
Nukleonika; 2016, 61, 2; 125-129
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some problems of plasma-material interactions in fusion devices
Autorzy:
Glazunov, G.
Volkov, E.
Lapshin, V.
Tereshin, V.
Sadowski, M.
Langner, J.
Stanisławski, J.
Powiązania:
https://bibliotekanauki.pl/articles/146712.pdf
Data publikacji:
2000
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
boron-carbide erosion
plasma-material interaction
TiN-coated stainless-steel
Opis:
The paper concerns some questions connected with the interaction of high-temperature plasma-ion fluxes with solid materials inside experimental chambers used for fusion-oriented research, and particularly inside the Torsatron-type facilities. Mechanisms of the boron carbide erosion are described and discussed. Also described is the behaviour of TiN-coated stainlesssteel surfaces under the irradiation with hydrogen plasma-ion fluxes. In summary, there are described damages in the boron carbide layers and changes in the composition of the TiN-coatings.
Źródło:
Nukleonika; 2000, 45, 3; 209-213
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method of impurity diagnostics in dense plasma systems
Autorzy:
Tsarenko, A. V.
Chebotarev, V. V.
Sadowski, M. J.
Tereshin, V. I.
Powiązania:
https://bibliotekanauki.pl/articles/146854.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
impurity diagnostics
local thermodynamical equilibrium
plasma accelerator
plasma-target interaction
spectral line
Opis:
The analysis of a plasma impurity composition in many plasma systems (such as coaxial plasma accelerators, magnetic- plasma compressors, plasma-focus devices, and others) is of great importance for plasma physics. In this work we have proposed a new spectral method for the determination of impurity concentrations in relation to the concentration of the main plasma (made of hydrogen in our case). This technique can be used e.g. for diagnostics of a peripheral zone in Plasma-Focus (PF) discharges, where LTE conditions must be fulfilled. Advantages of this method in comparison with other methods, as well as possible errors, are considered and discussed.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 37-40
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the electron capture process in semiclassical plasma
Autorzy:
Seisembayeva, M. M.
Dzhumagulova, K. N.
Ramazanov, T. S.
Powiązania:
https://bibliotekanauki.pl/articles/146223.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
capture time
differential cross-section
partially ionized plasma
perturbation theory
effective interaction potential
electron capture radius
Opis:
In this work, the process of electron capture in partially ionized plasma is considered. Electron- -atom interaction was described by the effective interaction potential, which takes into account the screening effect at large distances and the diffraction effect at the small distances. The results of numerical calculations of the electron capture radius, differential cross-section for different values of the coupling and density parameters are presented. The differential cross-section was obtained on the basis of perturbation theory and also by solving of the equation of motion of the projectile electron.
Źródło:
Nukleonika; 2016, 61, 2; 201-205
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyperfine interactions in Tb0.27-xYxDy0.73Fe2 compounds at 295 K
Autorzy:
Krawczyk, A.
Zwoźniak, A.
Guzdek, P.
Stoch, P.
Zachariasz, P.
Suwalski, J.
Pszczoła, J.
Powiązania:
https://bibliotekanauki.pl/articles/147818.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
hyperfine interaction
intermetallics
Laves phase
Mössbauer effect
Opis:
This paper concerns the synthesis of yttrium-dilute Tb0.27-xYxDy0.73Fe2 intermetallic series with a borderline compound Tb0.27Dy0.73Fe2 known as Terfenol-D by arc melting, XRD analysis and 57Fe Mössbauer effect studies at 295 K. XRD analysis (295 K) shows that all samples crystallize in a cubic, Fd3m, MgCu2-type structure. The lattice parameter increases along with yttrium content. Mössbauer effect spectra for the Tb0.27-xYxDy0.73Fe2 series collected at 295 K consist of two subspectra due to easy direction of magnetization <111>. Hyperfine interaction parameters: isomer shift, magnetic hyperfine field and a quadrupole splitting were obtained from the fitting procedure of the spectra.
Źródło:
Nukleonika; 2013, 58, 1; 133-135
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer investigations of Mn2-xFexP0.5As0.5
Autorzy:
Mitsiuk, V. I.
Tkachenka, T. M.
Budzyński, M.
Surowiec, Z.
Valkov, V. I.
Powiązania:
https://bibliotekanauki.pl/articles/147832.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Fe2P-type crystal structure
local environment
magnetic interaction
Mössbauer effect
Opis:
Magnetic and Mossbauer measurements were performed for Mn2.xFexP0.5As0.5, 0.5 less-than or equal to x less-than or equal to 1.0. It was shown that with decreasing Fe content magnetic interaction significantly weakens. Low temperature magnetic structure could be explained as a superposition of ferromagnetic and antiferromagnetic contributions to the whole magnetic moment of the alloy.
Źródło:
Nukleonika; 2013, 58, 1; 169-172
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 35

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