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Wyświetlanie 1-15 z 110
Tytuł:
Analytical Solution for a Problem of Directional Solidification in a Ternary System
Autorzy:
Alexandrov, D.
Ivanov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1808053.pdf
Data publikacji:
2009-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
44.05.+e
81.30.Fb
Opis:
This paper is devoted to new analytic results relating to the nonstationary dynamics of directional solidification of ternary solutions with two moving layers of the phase transition lying between solid and liquid phases. Explicit analytical solutions of the problem under consideration are constructed on the basis of laboratory experiments carried out by Aitta, Huppert and Worster.
Źródło:
Acta Physica Polonica A; 2009, 115, 4; 786-790
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-Similar Solidification of Binary Alloys
Autorzy:
Alexandrov, D.
Ivanov, A.
Malygin, A.
Powiązania:
https://bibliotekanauki.pl/articles/1808056.pdf
Data publikacji:
2009-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
44.05.+e
81.30.Fb
Opis:
The self-similar crystallization process of a binary mixture from a cooled boundary is studied on the basis of two models with a planar front and mushy layer. Approximate analytical solutions of the process describing the solidification with a mushy layer are found. The theory under consideration is in good agreement with experiments carried out by Huppert and Worster for ice growing from aqueous salt solutions.
Źródło:
Acta Physica Polonica A; 2009, 115, 4; 795-799
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peculiarities of Composition and Temperature Dependence of Energy-Band Parameters of Zn$\text{}_{x}$Cd$\text{}_{y}$Hg$\text{}_{1-x-y}$Te
Autorzy:
Andrukhiv, A.
Ivanov-Omskii, V.
Polit, J.
Sheregii, E.
Powiązania:
https://bibliotekanauki.pl/articles/1876920.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.25.Tn
Opis:
The influence of addition of Zn on band parameters of Zn$\text{}_{x}$Cd$\text{}_{y}$Hg$\text{}_{1-x-y}$Te solid solution at different temperatures (4.2-200 K) was investigated. The cyclotron resonance at 4.2 K and magnetophonon resonance at 77-200 K were used to determine band structure parameters. The temperature dependence of band structure parameters (energy gap, effective mass of electron) for the composition of series of epilayers (x varied in 0.08-0.20 range and y - 0.07-0.12) was obtained. It is found that band structure parameters for some compositions (for example x = 0.17, y = 0.08) are almost independent from temperature and equal: γ₁$\text{}^{L}$= 19.55, γ₂$\text{}^{L}$ = γ₃$\text{}^{L}$ = 8.5, K$\text{}^{L}$ = 6.48, F = -0.5, E$\text{}_{g}$ = 0.35 eV, E$\text{}_{p}$ = 17.9 eV. The effective mass of electrons was found to be greater with addition of Zn while the effective mass of heavy holes is left unchanged.
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 513-517
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two bone fragments of ornithocheiroid pterosaurs from the Cenomanian of Volgograd region, Southern Russia
Autorzy:
Averianov, A O
Kurochkin, E.N.
Pervushov, E.M.
Ivanov, A.V.
Powiązania:
https://bibliotekanauki.pl/articles/21981.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Volgograd Region
Cenomanian
Cretaceous
Pterosauria
Russia
Ornithocheiroidea
bone fragment
ornithocheiroid pterosaur
pterosaur
paleontology
Opis:
Two pterosaur bone fragments, a distal humerus and a distal femur, from the upper Cenomanian of the Volgograd Region in the Don River basin of southern Russia are reported. Although fragmentary, these bones come from mature individuals and are exceptionally well and three−dimensionally preserved, allowing a detailed description of their anatomy. Both specimens can be referred to a middle−sized ornithocheiroid pterosaur with a reconstructed wingspan of about 4 m. The humerus shows affinities with Istiodactylus from the Barremian of England, whereas the femur fragment is not identifiable beyond Ornithocheiroidea indet.
Źródło:
Acta Palaeontologica Polonica; 2005, 50, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plasma Focus as a lens for intense ion beam focusing
Autorzy:
Belan, V. N..
Butenko, V. I.
Ivanov, B. I.
Kiseleva, V. A.
Kitsenko, A. B.
Linnik, A. F.
Maslov, V. I.
Onishchenko, I. N.
Prishchepov, V. P.
Yegorov, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/147316.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
intense MeV proton beam accelerator
plasma focus
plasma lens
Opis:
Experimental investigations were performed to evaluate the focusing properties of the plasma focus for high-energy intense ion beams manipulating. Magnetic probes and optical spectroscopy were used for temporal and spatial plasma geometry investigations. Ion beam portrait was determined at the luminescence screen. In the experiments performed, the focusing coefficient was obtained as the ten times beam compression at the 30 cm length. By variations of the gas volume input, gun voltage, time delay, magnetic field value etc. the dependence of focused ion beam diameter upon various parameters of the plasma focus lens has been investigated. It was revealed that the main focusing effect was caused by the azimuthal magnetic field of the currents carried by the plasma.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 35-36
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Primenenie andragogicheskojj modeli obuchenija na primere metodov sokhranenija drevesiny sredstvami na osnove naturalnykh veshhestv
Zastosowanie andragogicznego modelu nauczania na przykładzie technik zabezpieczania drewna środkami na bazie naturalnych substancji
Autorzy:
Blaszczak, I.
Lisiecka, E.
Mielnik, A.
Ivanov, R.
Powiązania:
https://bibliotekanauki.pl/articles/9160.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2015, 92
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Carbonaceous Household Wastes as Fuel Feedstock at Thermo Metallurgical Equipment and Processes
Autorzy:
Boikov, A. V.
Ivanov, P. V.
Powiązania:
https://bibliotekanauki.pl/articles/952349.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
MSW
ecology
thermal treatment
RDF
conveyor kiln
Opis:
The possibility of utilization of municipal solid waste in the conveyor roasting cement production machine along with obtaining secondary thermal energy, what could reach 15-20% of the principal quantity of the heat energy required for the conduct of the process was considered. The inclusion of ash obtained from the incineration of municipal solid waste after preprocessing into the cement clinker composition was proposed. The reduction of the emission of dioxins and furans in the atmosphere and the impact on the environment was achieved as a result.
Źródło:
Journal of Ecological Engineering; 2016, 17, 3; 18-21
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrospinning of Fibres Using Mixed Compositions Based on Polyetherurethane and Hydrophylic Polymers for the Production of Membrane Materials
Elektroprzędzenie włókien przy użyciu mieszanych kompozycji na bazie polieterouretanu i polimerów hydrofilowych do produkcji materiałów membranowych
Autorzy:
Bokova, Elena S.
Kovalenko, Grigory M.
Pawlova, Maria
Kapustin, Ivan A.
Evsyukova, Nataliya V.
Ivanov, Leonid
Powiązania:
https://bibliotekanauki.pl/articles/231523.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
fibers electrospinning
polyurethane
polymer solutions processing
solutions modification
membrane materials
elektroprzędzenie włókien
poliuretan
przetwarzanie roztworów polimerowych
roztwór modyfikujący
materiały membranowe
Opis:
In this paper, the possibility of obtaining micro- and nanofibres, as well as nonwoven materials from polyether-urethane solutions using the method of electrospinning, was studied. The conditions and formulation-technological factors for the production of nonwoven fibrous webs from polyetherurethane (PUR) solutions modified with hydrophilic polymers: polyvinyl alcohol (PVA) and polyacrylic acid (PAA) were studied. The effect of hydrophilic polymers on the structure and average fibre diameter is shown. An increase in the indicators of hygienic properties of modified nonwoven materials was revealed with the aim of their further use in membrane bags for clothes and shoes.
W pracy zbadano możliwość otrzymywania mikro- i nanowłókien, a także włóknin z roztworów polieterowo-uretanowych metodą elektroprzędzenia. Badano warunki i czynniki technologiczne niezbędne do produkcji włóknin z roztworów polieterouretanu (PUR) modyfikowanych hydrofilowymi polimerami: polialkoholem winylowym (PVA) i kwasem poliakrylowym (PAA). Zbadano wpływ hydrofilowych polimerów na strukturę i średnią średnicę włókna. Stwierdzono wzrost wskaźników właściwości higienicznych modyfikowanych materiałów włókninowych, co pozwala na zastosowanie wytworzonych materiałów w materiałach membranowych.
Źródło:
Fibres & Textiles in Eastern Europe; 2020, 4 (142); 49-51
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of nanocomposite magnetic compounds based on layered semiconductors by means of electrochemical intercalation in a gradient magnetic field
Autorzy:
Boledzyuk, V.
Bakhtinov, A.
Kovalyuk, Z.
Kudrynskyi, Z.
Ivanov, V.
Slyn'ko, V.
Powiązania:
https://bibliotekanauki.pl/articles/1159217.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Tx
81.05.Hd
81.40.Rs
Opis:
In this paper we propose a method of intercalation of layered single crystals with atoms of 3d-metals in a magnetic-field gradient. We report on structure properties of Co_{x}InSe and Co_{x}In₂Se₃ layered crystals intercalated by cobalt. It was established that ferromagnetic ordering at room temperature is observed in the intercalated crystals. The crystals are a nanocomposite material that consists of a layered matrix and arrays of Co nanoformations on the van der Waals surfaces of InSe and In₂Se₃ layers.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 773-777
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of a powerful energy flow effect on materials in PF-1000 installation
Autorzy:
Borowiecki, M.
De Chiara, P.
Dubrovsky, A. V.
Dyomina, E. V.
Gribkov, V. A.
Ivanov, L. I.
Maslyaev, S. A.
Mezzetti, F.
Miklaszewski, R.
Pimenov, V. N.
Pizzo, L.
Scholz, M.
Szydlowski, A.
Ugaste, Y. E.
Volobuev, I. V.
Powiązania:
https://bibliotekanauki.pl/articles/148824.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dense plasma focus (DPF)
irradiation
plasma jet
shock wave
test specimen
Opis:
The report describes some of the results obtained in an experimental study of the impact of a powerful plasma stream and a fast ion beam generated in a PF-1000 device on different materials perspective for the use in radiation loaded parts of pulsed plasma installations. Investigations were done during and after the interaction processes. It is shown that in case of irradiation of samples only by high power flux density plasma streams the effect of detachment still preserved. At the same time a low power flux density high-energy ion beam plays an important role in the process of saturation of the irradiated material by hydrogen.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 117-122
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of fractal analysis and phase trajectories for the improvement of identification of complex technical systems
Autorzy:
Chovnyuk, Y. V.
Gumenyuk, Y. O.
Djachenko, L. A.
Ivanov, E. A.
Kravchyuk, V. T.
Powiązania:
https://bibliotekanauki.pl/articles/114794.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
fractal analysis
improvement
methods
phase trajectories
qualitative analysis
analiza fraktalna
trajektoria fazowa
analiza jakościowa
Opis:
The procedure of the qualitative analysis of complex technical systems is discussed. One may use such methods of analysis for time series characterized the functioning of such systems. These time serious aren’t confirmed the hypothesis of trend existence. One may use at this qualitative analysis the methods of nonlinear dynamics and the theory of chaos. The basis for similar researches is Takens’s theorem. The randomness of the studied dynamical system as the model of the complex technical system given by time realizations is established by means of Lyapunov’s indicator. The state stability is estimated by Hausdorf’s fractal dimension and the fractality index. Visual evaluation of the time series was carried out by means of the phase trajectory restoration procedure. As a result of the analysis of the phase points in the phase space the split attractor is indicated, which gives the chance to speak about its bifurcation.
Źródło:
Zeszyty Naukowe. Quality. Production. Improvement; 2019, 2 (11); 41-50
2544-2813
Pojawia się w:
Zeszyty Naukowe. Quality. Production. Improvement
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evaluation of the current state of EHF-sensors quality in the technical systems and its improvement
Autorzy:
Chovnyuk, Y. V.
Ivanov, E. A.
Dovhaljuk, V. B.
Shyshyna, M. A.
Gumenjuk, Y. O.
Sivak, I. N.
Powiązania:
https://bibliotekanauki.pl/articles/114875.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
aperture
coaxial line
dynamic range of the evaluation
extremely high frequency sensors
function of the entropy evaluation
scale of the entropy evaluation
oceny entropii
czujnik
funkcja oceny entropii
Opis:
In the article the function and the scale for the entropy evaluation of the current state of extremely high frequency (EHF-) sensors quality in the various technical systems which fits the requirements of universality and maximal independency from the human factor are offered. One may see such EHF-sensors for the analysis of the quick transformations of the biological liquids properties. It’s high lighted that the available methods of the determination of technical systems’ quality have essential flaws which consist in both subjectivism because the dominant role in the evaluation belongs to experts and legitimacy of providing them properties of universality which was proved by nobody. The scheme of EHF-sensor is analyzed for which one may create an analytical model. The problem of the fields’ determination at the working region of such sensor is discussed. The presented scheme is possible to use for the mathematical model and just for that part of the problem which is devoted to the transformation of the properties of the object. The results of calculation of components of electromagnetic field at the working space of EHF-sensor are discussed. One may estimate the sizes of this space. The offered function of the quality evaluation, the parameter of which is the quantity of own information of the explored sensor, provides the declared universality approach according to the principles of the information theory. The conformity to all requirements for the functions of the evaluation of the quality: continuity, monotonic and smoothness over the whole range of definition regardless of the probability distribution function, which is measured by the random value EHF-sensor was proved. The proposed scale of the entropy evaluation of the quality fits to standard settings of the diagnostic of the technical systems and has three sub ranges which determine the state of the EHF-sensors: good state, up state, and down state. Unlike the existing psychophysical scales the offered scale has dynamic range of the evaluation so the limits of the sub ranges will automatically change depending on the regulatory and technical requirements for the state of the explored EHF-sensor. Such approach provides adaptation of the scale to specific requirements which gives a chance to evaluate the qualitative state of the object more reliably. The results of modeling of the qualitative state of the sensor are given. The possible practical application of the offered function and scale is usage in the systems of monitoring and diagnostic for determination of the current qualitative state of the explored technical system, as well.
Źródło:
Zeszyty Naukowe. Quality. Production. Improvement; 2019, 2 (11); 26-40
2544-2813
Pojawia się w:
Zeszyty Naukowe. Quality. Production. Improvement
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The improvement of the rheological model for controlling the stress-strain state and humidity in the materials of museum pieces: zener thermodiffusion model for capillary-porous bodies
Autorzy:
Dovhaliuk, V. B.
Chovnyuk, Y. V.
Ivanov, E. A.
Shyshyna, M. O.
Powiązania:
https://bibliotekanauki.pl/articles/114762.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
aftereffect
colloid capillary-porous bodies
deformations
heat and mass transfer
Ishlinskiy - Rzhanitsin generalized rheological model of the elastic-viscous body
Zener thermodiffusion rheological model
model reologiczny
model termodyfuzji Zenera
ciało kapilarno-porowate
transfer ciepła
transfer masy
Opis:
The drying and humidifying processes of capillary-porous (colloid) bodies occur during the production of various materials for the consumer goods industry, building materials, storage of museum pieces, etc. It is known that the main linkage forms of the moisture and colloid capillary-porous bodies (CCPBs), namely adsorption, capillary condensation and capillary linkage of the free moisture in the cavities of the above bodies, depend on the temperature and relative humidity of drying/humidifying agent. It means that the CCPBs behave in a peculiar way depending on the temperature and humidity fields. The problems of CCPBs drying (or humidifying) process include the issue of the heat and humidity transfer both in the middle of the body and in the boundary layer on the interface of phases “body (object of drying/humidifying process) – environment”. The drying/humidifying intensity is at its maximum when the possibilities of the heat and mass transfer in the boundary layer correspond to the possibilities of moisture and heat moving inside the object of drying/humidifying process. The properties of the CCPB as material possessing specific elastic-viscous properties are described within the framework of O.Y. Ishlinskiy - O.R. Rzhanitsin generalized elastic-viscous body theory. A comparative analysis of the above mentioned CCPB’s properties from the point of view of Zener thermodiffusion theory is conducted. The mechanism of moisture transferring from the CCPBs’ central layers (as object of drying/humidifying process) up to their surfaces is developed. The theoretical researches examined the drying/humidifying phenomena for both the entire volume of the CCPB and three structural directions. It is noted that drying/humidifying of CCPBs is a complicated heat and mass transfer process accompanied by mechanisms of molecular nature determining the kinetics of their running. It is shown that the appropriate equations’ solution of molecular-molar heat and moisture transfer under the appropriate boundary (limit) conditions allows to describe the fields, i.e. the distribution of transfer potentials (the temperature and moisture content in the CCPB as object of drying/humidifying) at any time of the appropriate process. The drying/humidifying curves (“drying/humidifying rate versus CCPB humidity”) and the temperature curves (“CCPB temperatures versus CCPB humidity”) reflect the nature of the drying/humidifying processes. In the framework of the proposed generalized rheological model of CCPB, the residual deformations of bodies for various load types (the time-varying stress applied to the CCPB) is estimated.
Źródło:
Zeszyty Naukowe. Quality. Production. Improvement; 2019, 2 (11); 51-71
2544-2813
Pojawia się w:
Zeszyty Naukowe. Quality. Production. Improvement
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dense Plasma Focus as a powerful source of monochromatic X-ray radiation
Autorzy:
Dubrovsky, A.
Gribkov, V.
Ivanov, Y.
Karpiński, L.
Orlova, M.
Powiązania:
https://bibliotekanauki.pl/articles/147444.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dense plasma focus (DPF)
X-ray generation
X-ray dosimetry
exposure dose
absorbed dose
Opis:
A review of some experimental results obtained using the dense plasma focus (DPF) device PF-1000 is presented. The copper Ka1,2 radiation line generated by DPF in the case of device anode made of copper was the main object of this study. The predominance of this characteristic radiation over other kinds of radiation in the DPF X-ray spectrum is shown. A brief description of a new DPF 6.0 device as well as a radioenzymology experiment carried out within this device is presented.
Źródło:
Nukleonika; 2006, 51, 1; 21-28
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
0.2-kJ and 2-kJ high rep rate Dense Plasma foci : their design, technology, and applications
Autorzy:
Dubrovsky, A. V.
Gribkov, V. A.
Ivanov, Y. P.
Lee, P.
Lee, S.
Liu, M.
Samarin, V. A.
Powiązania:
https://bibliotekanauki.pl/articles/146546.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dense plasma focus (DPF)
DPF installation
miniature focus chamber
soft and hard X-ray radiation
Opis:
The paper presents various designs of several medium and small size Dense Plasma Focus (DPF) chambers intended for numerous applications, a description of technologies used in these facilities, and some results reached with these devices by using a number of diagnostic techniques. In present experiments the DP foci have been used mainly as an X-ray source. We discuss here how it is possible to satisfy absolutely new and very strict demands on the construction and technology for the devices to be eventually applied in science and industry. Between these characteristics there are a high repetition rate (typically 1…15 Hz) and a long lifetime (over 1 million shots). Their switching elements, a collector and chambers must withstand a high quasi-continuous heat load (up to 100 kW). High energy density in the central part of the chamber anode and the necessity to provide a channel for radiation extraction demanded a special construction and specific materials implementation in this region. Their X-ray spectrum should be tuned. They have to operate with different working gases and preferably in a wide range of pressures. All these points are discussed in this report. Capabilities of the described techniques are illustrated by results of the recent experimental studies carried out with facilities located at the Nanyang Technological University (NX1) as well as at the Lebedev Physical Institute (PF-0.2).
Źródło:
Nukleonika; 2001, 46, suppl. 1; 107-111
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 110

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