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Wyświetlanie 1-4 z 4
Tytuł:
Irradiation of austenitic steel 10Cr12Mn14Ni4AlMo and titanium alloy Ti-Al-V by pulsed streams of fast nitrogen ions and plasma in a dense plasma focus
Autorzy:
Gribkov, V. A.
Pimenov, V. N.
Roschupkin, V. V.
Maslyaev, S. A.
Demina, E. V.
Lyakhovitsky, M. M.
Dubrovsky, A. V.
Sasinovskaya, I. P.
Powiązania:
https://bibliotekanauki.pl/articles/971548.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
radiation
damage
phase transition
nanohardness
dense plasma focus (DPF)
Opis:
Austenitic steel 10Cr12Mn14Ni4AlMo and Ti-4Al-3V alloy were irradiated with nanosecond pulsed nitrogen ion and plasma streams in plasma focus devices. The two different modes of the treatment were applied: high power density (greater-than or equal to 10 8 W/cm2) irradiation with melting of the surface layer and irradiation with power density similar to 10 7 W/cm2 below the melting threshold. Structure and phase changes as well as the mechanisms of modification and hardening of the surface layers of the steel and titanium alloy upon applied irradiation are discussed.
Źródło:
Nukleonika; 2012, 57, 2; 291-295
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The experimental and theoretical investigations of damage development and distribution in double-forged tungsten under plasma irradiation-initiated extreme heat loads
Autorzy:
Väli, B.
Laas, T.
Paju, J.
Shirokova, V.
Paduch, M.
Gribkov, V. A.
Demina, E. V.
Pimenov, V. N.
Makhlaj, V. A.
Antonov, M.
Powiązania:
https://bibliotekanauki.pl/articles/148167.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
divertor material
nuclear fusion
off-normal events
thermal shock
tungsten
Opis:
The influence of extreme heat loads, as produced by a multiple pulses of non-homogeneous flow of slow plasma (0.1–1 keV) and fast ions (100 keV), on double-forged tungsten (DFW) was investigated. For generation of deuterium plasma and fast deuterons, plasma-focus devices PF-12 and PF-1000 are used. Depending on devices and conditions, the power flux density of plasma varied in a range of 107–1010 W/cm2 with pulse duration of 50–100 ns. Power flux density of fast ions was 1010–1012 W/cm2 at the pulse duration of 10–50 ns. To achieve the combined effect of different kind of plasmas, the samples were later irradiated with hydrogen plasma (105 W/cm2, 0.25 ms) by a QSPA Kh-50 plasma generator. Surface modification was analysed by scanning electron microscopy (SEM) and microroughness measurements. For estimation of damages in the bulk of material, an electrical conductivity method was used. Investigations showed that irradiation of DFW with multiple plasma pulses generated a mesh of micro- and macrocracks due to high heat load. A comparison with single forged tungsten (W) and tungsten doped with 1% lanthanum-oxide (WL10) reveals the better crack-resistance of DFW. Also, sizes of cells formed between the cracks on the DFW’s surface were larger than in cases of W or WL10. Measurements of electrical conductivity indicated a layer of decreased conductivity, which reached up to 500 µm. It depended mainly on values of power flux density of fast ions, but not on the number of pulses. Thus, it may be concluded that bulk defects (weakening bonds between grains and crystals, dislocations, point-defects) were generated due to mechanical shock wave, which was generated by the fast ions flux. Damages and erosion of materials under different combined radiation conditions have also been discussed.
Źródło:
Nukleonika; 2016, 61, 2; 169-177
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Damage and modification of materials produced by pulsed ion and plasma streams in Dense Plasma Focus device
Autorzy:
Pimenov, V. N.
Demina, E. V.
Ivanov, L. I.
Gribkov, V. A.
Dubrovsky, A. V.
Ugaste, U.
Laas, T.
Scholz, M.
Miklaszewski, R.
Kolman, B.
Tartari, A.
Powiązania:
https://bibliotekanauki.pl/articles/147722.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
plasma focus
pulse irradiation
surface damage
Opis:
The Dense Plasma Focus (DPF) devices PF-1000, PF-6 and PF-5M working with different gases and in dissimilar irradiation modes were used to carry out experimental investigations of irradiation of a number of materials by powerful pulsed ion and high-temperature plasma streams. The materials under test were designed for application in structural and functional components of thermonuclear fusion devices with magnetic (MPC) and inertial (IPC) plasma confinement, as well as for working chambers of plasma and accelerator devices. The main features of the materials are low-activation and radiation-resistant properties. On the basis of the investigations a significant progress was achieved in understanding of dynamics of high-energy nano- and micro-second pulsed streams in DPF from one side as well as on the mechanisms of their influence upon materials under irradiation from the other one. We demonstrated that this approach can be useful for certain tests of plasma-facing materials (e.g. W for MPC and stainless steels for IPC) and of structural (construction) elements of the above-mentioned devices subjected to pulsed high-energy radiation streams. The results obtained suggest also that DPF devices can be used in new pulse technologies for material treatment by means of powerful nanosecond and microsecond pulses of plasma and ion streams.
Źródło:
Nukleonika; 2008, 53, 3; 111-121
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrophoretic identification of allozyme variation in natural population of ticks Ixodes persulcatus Schulze (Acari: Ixodidae) in Irkutsk suburbs
Autorzy:
Dzhioev, Y. P.
Yakhnenko, V. M.
Revizor, A. O.
Kirilchik, S. V.
Kozlova, I. V.
Verkhozina, M. M.
Doroshchenko, E. K.
Demina, T. V.
Kapustin, Y. M.
Lisak, O. V.
Powiązania:
https://bibliotekanauki.pl/articles/363154.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
kleszcze
polimorfizm
allozym
enzyme systems
polymorphism
suburban areas
ticks
Opis:
Allozyme structure of the tick population Ixodes persulcatus coded by nine enzyme gene loci has been studied using two subsamples of ticks from Irkutsk suburban areas. Nine loci out of fourteen were polymorphic in ticks of Baikal highway population, whereas five loci were polymorphic in tics sampled from Goloustnoye highway. High level of intra-population heterogeneity of ticks has been revealed. No distinction between two populations from different nidi of infection has been recorded. It was probably due to the high rate of gene migration between the studied populations and to their high genetic similarity.
Źródło:
Environmental Biotechnology; 2009, 5, 2; 81-86
1734-4964
Pojawia się w:
Environmental Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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