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Wyświetlanie 1-15 z 145
Tytuł:
The Influence of the Chemical Compounds οn the Zinc Oxide Nanostructures Growth in Chemical Bath Deposition
Autorzy:
Byrczek, M.
Malewicz, M.
Halek, G.
Teterycz, H.
Powiązania:
https://bibliotekanauki.pl/articles/1807559.pdf
Data publikacji:
2009-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
Opis:
In this paper, the results of the investigation the growth of the zinc oxide nanocrystals during chemical bath deposition will be presented. The influence of the chemical compounds on the shape and the composition of the nanostructures were researched. Chemical compounds like hexamethylenetetramine, zinc nitrate hexahydrate, urea and ascorbic acid were used in experiments.
Źródło:
Acta Physica Polonica A; 2009, 116, S; S-111-S-113
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wettability of Ceramic Substrates by Silver Based Alloys
Autorzy:
Weltsch, Z.
Lovas, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399512.pdf
Data publikacji:
2013-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.08.Bc
Opis:
The temperature dependence of wettability (wetting angle, Θp(T)) for Ag-based melts on graphite and $Al_2O_3$ substrates is compared. Typical alloying effects are found, as the Ag host metal is gradually replaced by various metallic elements. The essence of alloying lies in the change of the electron/atom (e/a) ratio. This ratio is also manifested in the shift of wetting angles on the same substrate. The effect is also supported by the calculations based on the rigid band model, and is also in qualitative agreement with the Hume-Rothery rules. Nevertheless, the effects are partially smeared by other (metallurgical) factors, like the interaction between the oxygen-alloying elements and by the graphite substrate-oxygen interaction. In contrast, such effects are not pronounced in the case of $Al_2O_3$ substrates. As a consequence, Θp(T) exhibits an opposite trend in the case of two substrates. Crossovers of the Θp(T) curves were often found. The positions of crossovers depend on the chemical character and concentration of solute atoms. Segregation and epitaxial texture formation after solidification were also observed in certain alloy drops, especially in high concentration range. This phenomenon is not yet explained in every detail.
Źródło:
Acta Physica Polonica A; 2013, 124, 1; 78-87
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
WSPÓŁCZYNNIK DWUMODALNOŚCI BC I JEGO ZASTOSOWANIE W ANALIZACH ROZKŁADÓW ZMIENNYCH LOSOWYCH
BIMODALITY COEFFICIENT BC AND ITS APPLICATION IN ANALYSES OF RANDOM VARIABLES DISTRIBUTIONS
Autorzy:
Baszczyńska, Aleksandra
Pekasiewicz, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/453732.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
modalność
współczynnik dwumodalności BC
mieszaniny rozkładów
modality
bimodality coefficient BC
mixtures of distributions
Opis:
W analizach zjawisk ekonomicznych, przyrodniczych i psychologicznych istotne znaczenie ma badanie modalności rozkładu zmiennej losowej utożsamianej z analizowaną cechą statystyczną. Jedna z metod polega na wyznaczeniu na podstawie próby losowej współczynnika dwumodalności BC. Jego wartość pozwala podjąć decyzję o jednomodalności lub dwumodalności rozkładu analizowanej zmiennej. W pracy zaprezentowane zostały wyniki badań symulacyjnych dotyczących własności współczynnika BC. Ponadto zastosowano analizowany współczynnik do badania modalności rozkładu cen surowców na giełdach towarowych.
In the analyses of economic, natural and psychological phenomena, it is important to study the modality of distribution of a random variable identified with the analyzed statistical feature. One of the methods involves the determination of the coefficient of bimodality BC based on a random sample. Its value can decide about unimodality or bimodality of the analyzed variable distribution. The paper presents the results of simulation studies on the properties of the coefficient BC. Furthermore, the bimodality coefficient was used in the analyses of distributions of prices on commodity exchanges.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2014, 15, 3; 20-29
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Topographic Peculiarities of the Formation of Nanosized Particles from Metallopolymers
Autorzy:
Pomogailo, A. D.
Dzhardimalieva, G. I.
Rosenberg, A. S.
Powiązania:
https://bibliotekanauki.pl/articles/2035462.pdf
Data publikacji:
2002-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
81.07.Bc
Opis:
The morphology of solid phase products of thermal transformation of transition metal acrylates or its cocrystallites is studied. The thermal transformation of the metal-containing monomers studied consists in dehydration, solid phase polymerization and thermolysis process. The topography of the initial compounds and solid phase products of thermal decay, as well as their composition, are analyzed by optical and electron microscopies. The average particle sizes, d$\text{}_{EM}$, are: 6.0-13.0 nm in the case of FeAcr$\text{}_{6}$ (based on the data of electron diffraction, the main product is Fe$\text{}_{3}$O$\text{}_{4}$), 6.0 nm for FeCoAcr$\text{}_{8}$ and Fe$\text{}_{2}$CoAcr$\text{}_{14}$ (Fe$\text{}_{3}$O$\text{}_{4}$, CoO, Fe$\text{}_{2}$CoO$\text{}_{4}$), and 6 nm for CoMal$\text{}_{2}$ (CoO). The material formed consists of nanosized metal particles uniformly allotted in polymer matrix.
Źródło:
Acta Physica Polonica A; 2002, 102, 1; 135-145
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Magnetic Proporties of Polymer Matrix Nanocomposites
Autorzy:
Ławecka, M.
Leonowicz, M.
Kopcewicz, M.
Ślawska-Waniewska, A.
Kozubowski, J.
Dzhardimalieva, G. I.
Rosenberg, A. S.
Pomogailo, A.
Powiązania:
https://bibliotekanauki.pl/articles/2035519.pdf
Data publikacji:
2002-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
82.35.Np
Opis:
Structure and magnetic properties of the thermal decomposition products of Fe(III)Co(II) acrylate complex were analysed. The crystalline phases, which were found in the fully processed material, at 643 K, were Fe$\text{}_{3}$O$\text{}_{4}$, CoFe$\text{}_{2}$O$\text{}_{4}$, and CoO and had a mean particle size of about 30 nm. In the intermediate stages of the thermolysis iron was present in a form of Fe$\text{}^{III}$ (trivalent low-spin iron), Fe$\text{}^{2+}$ (divalent high-spin iron), and Fe$\text{}_{3}$O$\text{}_{4}$. The coercivity and remanence were measured versus temperature in the range of 5-300 K, in 1.1 T applied field. Both, $\text{}_{M}$H$\text{}_{c}$ and M$\text{}_{r}$, decreased showing room temperature values of 0.038 T and 7.49 mT, for coercivity and remanence, respectively. At temperatures below 200 K the hysteresis loops were asymmetrical, opened and shifted towards negative field values.
Źródło:
Acta Physica Polonica A; 2002, 102, 2; 317-321
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Different Organic Gelating Agents on Grain Size of ZnO Nanoparticles
Autorzy:
Karaal, Ş.
Köse, H.
Aydin, A.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1218769.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
81.07.Bc
Opis:
In this work, sol-gel method was used in order to synthesize ZnO nanoparticles. $Zn(CH_3COO)_2$·$2H_2O$ was used to obtain ZnO precursor solution. To investigate the effect of organic gelating agents on grain size, various organic gelating agents such as triethanolamine (TEA), glycerin (GLY), ethylene glycol (EG), citric acid (CA) and tartaric acid (TA) were used. X-ray diffraction analysis was used for phase identification and grain size calculation. ZnO powders were characterized by using Fourier-transform infrared spectroscopy, scanning electron microscopy and atomic force microscopy.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 338-340
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Grain Refinement after Various Thermo-Mechanical Treatments in AZ80 and ZK60 Magnesium Alloys
Autorzy:
Ryspaev, T.
Janecek, M.
Minárik, P.
Wesling, V.
Wagner, L.
Kral, R.
Powiązania:
https://bibliotekanauki.pl/articles/1419057.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Gh
81.07.Bc
Opis:
The effect of thermal processing prior to severe plastic deformation by extrusion and swaging on grain refinement in ZK60 and AZ80 alloys was studied. The alloys received in direct-chill cast condition were homogenized at 415C and annealed (over-aged) at temperatures from 200 to 380°C. Both the direct-hill cast and over-aged conditions were extruded at T = 300C using an extrusion ratio of ER = 19. Hot extrusion resulted in substantial grain refinement in both cases, the effect being stronger in the over-aged material. The extruded bars were severe plastically deformed at 250C by swaging. Swaging refined further the grain size depending on the deformation ratio (number of passes). At optimal processing conditions the grain size was 450 nm and 570 nm for the AZ80 and ZK60 alloys, respectively.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 622-624
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Optical Properties of Co and Zn-Based Metal Oxide Nanoparticle Thin Films
Autorzy:
Gungor, E.
Gungor, T.
Caliskan, D.
Ozbay, E.
Powiązania:
https://bibliotekanauki.pl/articles/1032063.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
78.67.Bf
Opis:
ZnO, Co doped ZnO (ZnO:Co) and CoO thin films were deposited on glass substrates by using the spark discharge technique with Zn-Zn, Zn-Co and Co-Co metal electrodes (tips). The structural and optical properties of the films were characterized by X-ray diffraction, scanning electron microscopy measurements and UV-Vis spectrometry. Cubic phase reflection of CoO (200) was observed in the samples containing Co. The size of nanoparticles had varied between 38 nm and 200 nm in ZnO thin films. When Co electrode was used, spherical structure had deteriorated and clusters of particles, with smaller radii, were observed. In addition, when Co-Co electrode pairs were used, various cavities with different sizes were formed. Especially, it was observed that the optical transmittance had generally increased with the decreasing spark (charge) voltage, while increasing with the number of sparks. The Co-containing samples were green in color and it was observed that the loss of transmission appears in a specific region in the Co-doped ZnO thin films due to characteristic d-d transition of Co²⁺ ions. The thickness of the films had decreased with the increasing number of sparks. In addition, the band gap energy, E_{g}, evaluated by UV-Vis spectroscopy measurements has been shifted to higher wavelengths (red shift) for the ZnO:Co thin films.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 500-503
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydroquinone Synthesis of Silver Nanoparticles from Silver Bromide Suspensions
Autorzy:
Król-Gracz, A.
Nowak, P.
Michalak, E.
Dyonizy, A.
Powiązania:
https://bibliotekanauki.pl/articles/1491287.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-Bc
61.46.Hk
Opis:
The results of research into the preparation of silver nanoparticles using photoreduction in the presence of hydroquinone as the reductant were discussed. Substrates for the synthesis of silver nanoparticles were ultrafine crystalline gelatine-stabilised aqueous suspensions of silver bromide. The influence of the reductant to substrate molar ratio and the medium's pH to the efficient production of silver nanoparticles were studied. The properties of resultant silver particles were examined using UV-Vis spectroscopy. Transmission electron microscopy was used for the photomicrography of silver nanoparticles suspensions.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 196-199
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetoelastic Properties of Hitperm-Type Alloys from Torque Moment
Autorzy:
Salach, J.
Bieńkowski, A.
Szewczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/1813578.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
75.80.+q
Opis:
The following paper presents the results of the investigation on the influence of the torque on the magnetic characteristics of the Hitperm-type $Fe_{41.5}Co_{41.5}Cu_1Nb_3B_{13}$ alloy, in as-quenched and nanocrystalline state. The methodology of application of the torque to the ring-shaped core is also described. This methodology gives a possibility of achieving uniform shearing stresses in the core. The results indicate that shearing stress sensitivity of Hitperm-type alloys depends on the annealing and nanocrystallization process. This effect should be considered during the development of magnetoelastic torque sensors.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 115-118
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
What Makes a Man? Body Concepts in the South Baltic During the Late Bronze and Early Iron Ages
Co czyni człowieka? Koncepcje ciała w strefie południowego Bałtyku późnej epoki brązu i wczesnej epoki żelaza
Autorzy:
Ślusarska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/31343191.pdf
Data publikacji:
2023-12-31
Wydawca:
Muzeum Narodowe w Szczecinie
Tematy:
First Millennium BC
anthropomorphism
body
visual narratives
pattern recognition
I tysiąclecie BC
antropomorfizacja
ciało
narracja wizualna
rozpoznawanie wzorów
Opis:
The aim of this study is to find an answer how human body was perceived and valued by the communities of the southern Baltic coast in the first half of the 1st millennium BC, i.e. during the period of development of the Lusatian culture and the Pomeranian culture associated with the Late Bronze Age and with Early Iron Age respectively. The research area included the northern part of the European Plain between the Elbe and Vistula-Narew-Bug basin. Sixteen sculptures and 35 representations engraved on urns were analysed. Pattern recognition was applied to identify them.
Celem tego studium jest próba odpowiedzi na pytanie, w jaki sposób cielesność człowieka była postrzegana i waloryzowana przez społeczności południowego wybrzeża Bałtyku w pierwszej połowie I tysiąclecia BC, a więc w okresie rozwoju kultury łużyckiej, wiązanej z późną epoką brązu, i kultury pomorskiej odpowiadającej wczesnym fazom epoki żelaza. Obszarem badań objęto północną część Niżu Europejskiego pomiędzy dorzeczem Łaby a dorzeczem Wisły, Narwi i Bugu. Analizie poddano 16 przedstawień pełnofigurowych oraz 35 przestawień rytych na urnach ciałopalnych. Do ich identyfikacji posłużono się teorią rozpoznawania wzorców.
Źródło:
Materiały Zachodniopomorskie; 2023, 19; 55-78
0076-5236
2956-9893
Pojawia się w:
Materiały Zachodniopomorskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanochemical Preparation and Magnetic Properties of Fe₃O₄/ZnS Nanocomposite
Autorzy:
Bujňáková, Z.
Zorkovská, A.
Kováč, J.
Powiązania:
https://bibliotekanauki.pl/articles/1032141.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
81.20.Ev
81.20.Wk
Opis:
Powder nanocomposite of Fe₃O₄/ZnS was prepared by mechanochemical synthesis in a planetary ball mill. In this reaction natural magnetite mineral Fe₃O₄ was used, together with zinc acetate (CH₃COO)₂Zn·2H₂O and sodium sulfide Na₂S·9H₂O, as precursors for the zinc sulfide ZnS. X-ray diffraction revealed that the sample is composed of small nanocrystalline particles, containing Fe₃O₄ and ZnS. The non-milled magnetite showed distinctive Verwey transition at around 120 K, this becomes suppressed after milling, as a consequence of structural disorder and presence of defects. Moreover, the reduction of saturation magnetization from 91 A m²/kg to 69.2 A m²/kg was observed, as a consequence of the milling process. The magnetization of the Fe₃O₄/ZnS nanocomposite was the lowest (34.5 A m²/kg), due to the milling and to the decreased weight fraction of the ferrimagnetic component. Nevertheless, the Fe₃O₄/ZnS sample demonstrates ferrimagnetic behavior as well, and its structure is less perturbed by milling, the Verwey transition, although less impressive, but is preserved.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1120-1122
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Penetration of Gold Nanoparticles into Silicon Dioxide
Autorzy:
Ilkiv, I.
Kotlyar, K.
Amel'chuk, D.
Lebedev, S.
Cirlin, G.
Bouravleuv, A.
Powiązania:
https://bibliotekanauki.pl/articles/1033145.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.23.Pq
61.46.Df
68.08.Bc
Opis:
We report on an experimental study of the thermal annealing processes under air and nitrogen atmospheres of colloidal Au nanoparticles deposited onto SiO₂/Si(100) samples. It was shown that Au nanoparticles during annealing under ambient conditions could penetrate inside silicon dioxide layers forming pores at that their lengths were found to be dependent on the annealing time. The influence of oxygen on the penetration process is discussed. At the same time, the annealing of Au nanoparticles under nitrogen conditions did not result in the formation of pores.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 366-369
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocrystalline Nickel Oxide (NiO) Thin Films Grown on Quartz Substrates: Influence Of Annealing Temperatures
Autorzy:
Hajakbari, F.
Taheri Afzali, M.
Hojabri, A.
Powiązania:
https://bibliotekanauki.pl/articles/1033487.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Tv
81.07.Bc
81.15.cd
Opis:
In the present investigation, nanocrystalline NiO thin films were prepared by thermal oxidation annealing of DC magnetron sputtered Ni thin films on quartz substrates. The effect of annealing temperature on the films structural, morphological and optical properties was investigated. The XRD analysis shows that all prepared films were of NiO with cubic structure and (200) orientation. The thickness of NiO films was in range of 40-100 nm. The average crystallite size is found to increase from 16 to 36 nm and the optical band gap energy decreases from 3.62 to 3.38 eV by increasing the annealing temperature from 400°C to 600°C. The AFM and SEM results show that the annealing temperature effectively influences the surface morphology of the films.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 417-419
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
HK-means: A heuristic approach to initialize and estimate the number of clusters in biological data
Autorzy:
Reddy Edla, D.
Gondlekar, V.
Gauns, V.
Powiązania:
https://bibliotekanauki.pl/articles/1070222.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Tp
29.85.Fj
93.85.Bc
Opis:
K-means algorithm is one of the simplest and fastest clustering algorithms existing since more than four decades. One of the limitations of this algorithm is estimating number of clusters in advance. This algorithm also suffers from random initialization problem. This paper proposes a heuristic which initializes the cluster centers and estimates the number of clusters as a discrete value. The method estimates the number of clusters and initializes many cluster centers successfully for the clusters that are dense and separated significantly. The method selects a new cluster center in each iteration. The point selected is the point which is most dissimilar from the previously chosen points. The proposed algorithm is experimented on various synthetic data and the results are encouraging.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 78-82
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 145

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