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Wyświetlanie 1-15 z 16
Tytuł:
Determinants method of explanatory variables set selection to linear model
Autorzy:
Rzymowski, W.
Surowiec, A.
Powiązania:
https://bibliotekanauki.pl/articles/102317.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
linear regression analysis
least square parameter estimation
relative error
Gram matrix
Opis:
The determinants method of explanatory variables set selection to the linear model is shown in this article. This method is very useful to find such a set of variables which satisfy small relative error of the linear model as well as small relative error of parameters estimation of this model. Knowledge of the values of the parameters of this model is not necessary. An example of the use of the determinants method for world’s population model is also shown in this article. This method was tested for 224 – 1 models for a set of 23 potential explanatory variables. 5 world’s population models with one, two, three, four and five explanatory variables were chosen and analysed.
Źródło:
Advances in Science and Technology. Research Journal; 2014, 8, 23; 80-87
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ zjawiska piętrzenia wody powodziowej na stateczność nasypu kolejowego
Influence of floods on stability of railway embankment
Autorzy:
Balawejder, A.
Kozłowski, W.
Surowiec, A.
Powiązania:
https://bibliotekanauki.pl/articles/251125.pdf
Data publikacji:
2009
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
nasyp kolejowy
piętrzenie wody
powódź
transport kolejowy
embankment
flood
Opis:
Zadaniem każdej budowli inżynierskiej jest bezpieczne przeniesienie i przekazanie nacisków na podłoże gruntowe. W przypadku budowli ziemnych, do których zaliczają się nasypy komunikacyjne, zagrożeniem bezpieczeństwa ich pracy jest utrata stateczności skarp, polegająca na przemieszczeniu się masy gruntu. Zjawisko to jest wynikiem przekroczenia wytrzymałości gruntu na ścinanie wzdłuż pewnej powierzchni, nazywanej powierzchnią po.ślizgu.
Źródło:
TTS Technika Transportu Szynowego; 2009, 7-8; 88-90
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatyzacja procesu wyodrębniania stref izowartościowych nieruchomości w oparciu o zdjęcia lotnicze
Autorzy:
Surowiec, G.
Malczewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/129968.pdf
Data publikacji:
2001
Wydawca:
Stowarzyszenie Geodetów Polskich
Tematy:
strefa izowartościowa
nieruchomość
zdjęcie lotnicze
plan zagospodarowania przestrzennego
isovaluated zone
property
aerial photo
zoning plan
Opis:
The article presents the findings of research whose aim is the elaboration of an interpretative key for the automation of processes by which land areas of equal value can be defined on the basis of colour aerial photographs.
Źródło:
Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2001, 11; 1-29-1-35
2083-2214
2391-9477
Pojawia się w:
Archiwum Fotogrametrii, Kartografii i Teledetekcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lokalizacja granic w ekosystemach z wykorzystaniem termowizji
Autorzy:
Lubecki, A.
Surowiec, J.
Powiązania:
https://bibliotekanauki.pl/articles/130270.pdf
Data publikacji:
2001
Wydawca:
Stowarzyszenie Geodetów Polskich
Tematy:
ekosystem
struktura krajobrazu
termowizja
ecosystem
landscape structure
thermovision
Opis:
Ekosystems which include all organisms living on a given area, together with physical environment, are connected between each other with processes of energy flow and matter circulation. The factors which condition existing of these processes in ecosystems are green plants, animals as well as funga and bacteria. These groups constitute trophic structure in the form of food chains. The general principle of ecosystem reduces to the fact that one organism is a source of food for the other, the latter for the next and soon. Tacing into account diversity of ecosystems, reflecting a series of elements of geographical environment, we deal with thermal diversity of the ground, which in turn, decides about absorption, dissipation or reflection of thermal energy reaching the surface of the Earth. These phenomena, recorded by thermovision systems can be located on thermogrammes. The problem to be discussed is determination of borders between ecosystem groups on the basis of superficial distribution of temperatures on thermogrammes recorded from a plane.
Źródło:
Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2001, 11; 5-65-5-70
2083-2214
2391-9477
Pojawia się w:
Archiwum Fotogrametrii, Kartografii i Teledetekcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New data on the non-indigenous gammarids in the Vistula Delta and the Vistula Lagoon
Autorzy:
Surowiec, J.
Dobrzycka-Krahel, A.
Powiązania:
https://bibliotekanauki.pl/articles/48578.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Gammarus salinus
Polska
Gammarus oceanicus
Vistula delta
Baltic Sea
non-indigenous species
Gammarus duebeni
gammarid species
Gammarus varsoviensis
Gammarus zaddachi
Vistula Lagoon
Opis:
This communication reports on the occurrence of non-indigenous gammarid species of Ponto-Caspian and of North American origin – in the lower course of the River Vistula, in its Delta and in the Vistula Lagoon.
Źródło:
Oceanologia; 2008, 50, 3; 443-447
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of magnetite Fe3O4 nanoparticles for magnetic hyperthermia
Autorzy:
Surowiec, Z.
Miaskowski, A.
Budzyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/147118.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer effect
superparamagnetic nanoparticles
hyperthermia
Opis:
The paper presents the investigation of magnetic nanoparticles (MNPs) dedicated to hyperthermia application. The crystal structure and size distributions have been determined by means of transmission electron microscope (TEM) and X-ray diffraction (XRD). Magnetic properties of the nanoparticles were tested by Mössbauer spectroscopy together with calorimetric experiments. The Mössbauer spectroscopic study of MNPs revealed the existence of a superparamagnetic phase. The relative contribution of the relaxing component to the total spectrum at room temperature was about 10%. The heating effect of these MNPs under alternating magnetic field was examined. The temperature increase has reached 5°C in 10 min. The preliminary temperature rise suggests that the investigated materials are applicable for hyperthermia.
Źródło:
Nukleonika; 2017, 62, 2; 183-186
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Magnetite Nanopowders Prepared by Co-Precipitation Method
Autorzy:
Durak, K.
Wiertel, M.
Surowiec, Z.
Miaskowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1033944.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Wx
47.65.Cb
78.70.Bj
61.72.J-
61.72.Mm
68.37.Hk
Opis:
Nanosized iron oxide powders are materials considered with regard to its application in medical therapy called hyperthermia. Magnetite nanopowders with crystallite size varying from 6.6 to 11.8 nm have been prepared by the co-precipitation method. In this study a change of a crystallite size is driven mainly by varying of initial pH of water ammonia solution in which a process of magnetite precipitation runs. Crystallographic structures and phase composition obtained samples and the size of magnetite nanoparticles were determined by X-ray diffraction method. Positron lifetime spectroscopy has been used to assess defectiveness of microstructure. Experimental positron annihilation spectra were successfully resolved into three lifetime components. It appears that from point of view of microstructure the defects concentrations in studied nanopowder samples are very high which causes a saturation of positron trapping.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1593-1597
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$\text{}^{57}Fe$ Hyperfine Interactions in the $Sc(Fe_{1-x}Ni_x)_2$ Laves Phases Synthesized under High Pressure
Autorzy:
Wiertel, M.
Surowiec, Z.
Budzyński, M.
Tsvyashchenko, A.
Powiązania:
https://bibliotekanauki.pl/articles/1811581.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
77.80.Bh
75.30.Kz
07.35.+k
Opis:
The structural and microscopic magnetic properties of the pseudobinary $Sc(Fe_{1-x}Ni_x)_2$ system prepared under high pressure of 8 GPa were studied by X-ray diffraction and Mössbauer measurements in the range of 0.0 ≤ x ≤ 0.60. The samples for 0.0 ≤ x ≤ 0.10 have the hexagonal C14-type structure and those for 0.30 ≤ x ≤ 0.60 crystallize in the C15-type structure. Both the magnetic hyperfine field on $\text{}^{57}Fe$ and the Curie temperature decrease with the increasing Ni content and the system becomes paramagnetic for x ≈ 0.60 at room temperature. The form and temperature dependences of the Mössbauer spectra for 0.40 ≤ x ≤ 0.50 indicate the coexistence of paramagnetic and ferromagnetic regions in the samples and occurrence of magnetic clusters with a wide distribution of the Curie temperatures. It is interesting that $T_C$ for the compounds obtained under high pressure are by about 100 K smaller in comparison with those for the isostructural samples produced under normal pressure even though interatomic distances are practically equal in the both types of compounds.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1517-1527
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An application of Mössbauer spectroscopy in the studies of iron - molybdenum silica mesoporous materials
Autorzy:
Surowiec, Z.
Wiertel, M.
Marynowska, A.
Gac, W.
Zawadzki, W.
Powiązania:
https://bibliotekanauki.pl/articles/147814.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
iron
MCM-41 porous silica
molybdenum
Mössbauer effect
superparamagnetic nanoparticles
Opis:
Iron-molybdenum silica mesoporous materials were obtained by the application of direct hydrothermal method. Four samples with different metal contents relative to silica were investigated. Incorporation of iron and molybdenum ions in the synthesis stage led to structural changes of the MCM-41 support. With an increasing metals content, cylindrical pores of silica initially transformed into bottle-ink type pores, and then into the slit-like ones. Mössbauer spectroscopy investigations indicated that Fe ions were embedded in the silica walls and then formed nanosized crystallites in the pores. Superparamagnetic phase was observed at liquid nitrogen temperature.
Źródło:
Nukleonika; 2013, 58, 1; 137-141
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of N₂⁺ Ion Implantation and Thermal Annealing on Near-Surface Layers of Implanted GaAs
Autorzy:
Kulik, M.
Surowiec, Z.
Rzodkiewicz, W.
Filiks, J.
Drozdziel, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402234.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Fd
78.68.+m
79.20.Rf
Opis:
The surface of semi-isolating GaAs (100) was irradiated with a fluence of 6×10¹⁷ cm¯² of the N₂⁺ ion beam; then, the samples were thermally annealed at temperatures of 500, 700, and 900°C for 2 h in an argon gas flow. The surface roughness of implanted samples was investigated with the help of atomic force microscopy. Numerous hillocks, which caused a significant increase in surface roughness, were observed. The spectroscopic ellipsometry method was used for determination of pseudo-dielectric functions of the near-surface layers in the investigated samples and the thickness of native oxides covering the irradiated surface. It was observed that the shapes of disorder spectra of the dielectric functions of near-surface layers of implanted GaAs partly returned to their original state after the thermal annealing.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 918-922
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and structural properties of Sc(Fe1−xSix)2 Laves phases studied by Mössbauer spectroscopy and neutron diffraction
Autorzy:
Wiertel, M.
Surowiec, Z.
Budzyński, M.
Sarzyński, J.
Beskrovnyi, A. I.
Powiązania:
https://bibliotekanauki.pl/articles/147702.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
hyperfine fields
Mössbauer effect
neutron diffraction
quasibinary Laves phase
Opis:
The investigations of iron-containing phases existing in fly ashes were performed using transmission Mössbauer spectrometry. The examined samples of fly ashes were collected from different coal combustion systems, that is, stoker-fired boiler in municipal heating plant and pulverized coal boiler in power plant. Several phases are identifi ed in the samples: iron oxides, paramagnetic aluminosilicate glass with Fe3+ ions and Al2O4- -type spinel with Fe2+ ions. It was pointed out that proportions of contents of phases strongly depend not only on the combustion temperature but also on the way of ash collection.
Źródło:
Nukleonika; 2015, 60, 1; 155-160
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Hyperfine Interactions in Aurivillius $Bi_{9}Ti_{3}Fe_{5}O_{27}$ Conventionally Sintered Compound
Autorzy:
Mazurek, M.
Lisińska-Czekaj, A.
Surowiec, Z.
Jartych, E.
Czekaj, D.
Powiązania:
https://bibliotekanauki.pl/articles/1506653.pdf
Data publikacji:
2011-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Je
81.20.Ev
31.30.Gs
76.80.+y
Opis:
The structure and hyperfine interactions in the $Bi_{9}Ti_{3}Fe_{5}O_{27}$ Aurivillius compound were studied using X-ray diffraction and Mössbauer spectroscopy. Samples were prepared by the conventional solid-state sintering method at various temperatures. An X-ray diffraction analysis proved that the sintered compounds formed single phases at temperature above 993 K. Mössbauer measurements have been carried out at room and liquid nitrogen temperatures. Room-temperature Mössbauer spectrum of the $Bi_{9}Ti_{3}Fe_{5}O_{27}$ compound confirmed its paramagnetic properties. However, low temperature measurements revealed the additional paramagnetic phase besides the antiferromagnetic one.
Źródło:
Acta Physica Polonica A; 2011, 119, 1; 72-74
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Magnetic Properties of Bi5Ti3FeO15 Ceramics Prepared by Sintering, Mechanical Activation and Edamm Process. A Comparative Study
Autorzy:
Jartych, E.
Pikula, T.
Mazurek, M.
Franus, W.
Lisinska-Czekaj, A.
Czekaj, D.
Oleszak, D.
Surowiec, Z.
Aksenczuk, A.
Calka, A.
Powiązania:
https://bibliotekanauki.pl/articles/352172.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Aurivillius compounds
sintering
mechanical activation
magnetic properties
Opis:
Three different methods were used to obtain Bi5Ti3FeO15 ceramics, i.e. solid-state sintering, mechanical activation (MA) with subsequent thermal treatment, and electrical discharge assisted mechanical milling (EDAMM). The structure and magnetic properties of producedBi5Ti3FeO15 samples were characterized using X-ray diffraction and Mössbauer spectroscopy. The purest Bi5Ti3FeO15 ceramics was obtained by standard solid-state sintering method. Mechanical milling methods are attractive because the Bi5Ti3FeO15 compound may be formed at lower temperature or without subsequent thermal treatment. In the case of EDAMM process also the time of processing is significantly shorter in comparison with solid-state sintering method. As revealed by Mössbauer spectroscopy, at room temperature theBi5Ti3FeO15 ceramics produced by various methods is in paramagnetic state.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 869-874
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyperfine interactions and irreversible magnetic behavior in multiferroic Aurivillius compounds
Autorzy:
Jartych, E.
Gąska, K.
Przewoźnik, J.
Kapusta, C.
Lisińska-Czekaj, A.
Czekaj, D.
Surowiec, Z.
Powiązania:
https://bibliotekanauki.pl/articles/147358.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Aurivillius compounds
hyperfine interactions
magnetic properties
Mössbauer spectroscopy
multiferroics
Opis:
In this work investigations of structure and magnetic properties of conventionally sintered Bim+1Ti3Fem.3O3m+3 compounds with 4 less-than or equal to m less-than or equal to 8 were performed using X-ray diffraction, Mossbauer spectroscopy and vibrating sample magnetometry. Room-temperature Mossbauer spectra of the compounds correspond to a paramagnetic state, however, low temperature measurements (80 K) reveal the antiferromagnetic state with a residual paramagnetic phase. Temperature dependencies of magnetic susceptibility,chi sigma(T), provided magnetic ordering temperatures and revealed an irreversibility in Aurivillius compounds with m greater-than or equal to 5. In the case of Bi5Ti3FeO15 compound the chi sigma(T) dependence shows a paramagnetic behavior down to 2 K. The Bi6Ti3Fe2O18 compound reveals a magnetic ordering at 11 K. The compounds with m = 6-8 show a magnetic ordering at temperatures higher than 200 K. Highly irreversible character of their temperature dependencies of chi sigma indicates a spin-glass type disordered magnetism with frustration due to a random distribution of Fe on Ti at their sites.
Źródło:
Nukleonika; 2013, 58, 1; 47-51
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The study of crystal and magnetic properties of MnNi0.85Fe0.15Ge
Autorzy:
Budzyński, M.
Valkov, V. I.
Golovchan, A. V.
Mitsiuk, V. I.
Sivachenko, A. P.
Surowiec, Z.
Tkachenka, T. M.
Powiązania:
https://bibliotekanauki.pl/articles/148187.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer effect
magnetic interaction
hexagonal structure
Opis:
Magnetic and Mössbauer measurements were performed for MnNi0.85Fe0.15Ge. The Mössbauer data indicate that Fe atoms in MnNi0.85Fe0.15Ge are randomly distributed over two types of metal sites in hexagonal structure. At 77 K, the hyperfi ne magnetic fi elds at Fe located in different crystal sites have similar values of about 12.7 and 12.3 T. The random site distribution of the iron atoms in the non-magnetic hexagonal phase at high temperatures is confi rmed by the theoretical calculations in fully relativistic Korringa−Kohn−Rostoker (KKR) method.
Źródło:
Nukleonika; 2015, 60, 1; 11-14
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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