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Wyświetlanie 1-25 z 1499
Tytuł:
Od redaktorów naukowych
From editors
Autorzy:
Gofron, Andrzej
Łukasik, Beata
Powiązania:
https://bibliotekanauki.pl/articles/629133.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:
x
Źródło:
Podstawy Edukacji; 2010, 3; 9-14
2081-2264
Pojawia się w:
Podstawy Edukacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X pinch as a source for X-ray radiography
Autorzy:
Pikuz, S.
Shelkovenko, T.
Romanova, V.
Sinars, D.
Hammer, D.
Bland, S.
Lebedev, S.
Powiązania:
https://bibliotekanauki.pl/articles/147532.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
wire array
X-pinch
X-ray imaging
X-ray radiography
Z-pinch
Opis:
This article describes several applications and methods using the X pinch as a source of X-ray radiation for the radiography of dense plasma objects. These methods, in general, do not use pinholes, and instead take the advantage of the small size (<1 mm, and in some cases <3 mm) and a short X-ray emission duration (<1 ns) of the radiation source produced by an X pinch. Two of these methods, monochromatic and direct point-projection backlighting, are discussed. Experimental images of exploding wires and wire arrays obtained on the BIN, XP, and MAGPIE generators using these techniques are presented. Also included are detailed measurements made on the XP generator of the emission characteristics of X pinches using different wire materials.
Źródło:
Nukleonika; 2001, 46, 1; 21-25
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wzorcowanie funkcji pomiaru czasu ekspozycji w miernikach promieniowania rentgenowskiego
Calibration of exposure duration in the X-ray analyser
Autorzy:
Urban, Arkadiusz
Czubla, Albin
Knyziak, Adrian
Powiązania:
https://bibliotekanauki.pl/articles/268140.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
wzorcowanie miernika promieniowania X
pomiar czasu ekspozycji
promieniowanie X
aparat rentgenowski
calibration
exposure time measurement
X-ray
X-ray machine
X-ray multimeter
Opis:
W artykule opisano problematykę pomiarów przedziałów czasu równych czasowi ekspozycji promieniowania X. Pokazano zależność niepewności pomiaru od metody pomiarowej oraz od sposobu działania źródła promieniowania rentgenowskiego. Przedstawiono wpływ zakresu przedziału czasu mierzonego przez miernik na wielkość błędu.
Main idea of the article is a description of problems of X-ray exposure time measurement. Content describes two types of X-ray machines. Among the two X-ray machine types, continuous type with shutter is more suitable for long time measurement, and pulse type is better for short time measurements. The article discuss differences between mode of operation of different X-ray sources and it’s impact on uncertainty of measurement of exposure time. It also discuss impact of different resolution settings of device under calibration on uncertainty measurement.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2019, 66; 91-94
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pomiar czasu ekspozycji w miernikach promieniowania rentgenowskiego
Measurement of exposure duration in the X-ray analyser
Autorzy:
Urban, Arkadiusz
Czubla, Albin
Knyziak, Adrian
Powiązania:
https://bibliotekanauki.pl/articles/88863.pdf
Data publikacji:
2020
Wydawca:
Główny Urząd Miar
Tematy:
pomiar czasu ekspozycji
promieniowanie X
aparat rentgenowski
exposure time measurement
X-ray
X-ray machine
X-ray multimeter
Opis:
W artykule opisano problematykę pomiarów przedziałów czasu równych czasowi ekspozycji promieniowania X. Pokazano zależność niepewności pomiaru od metody pomiarowej oraz od sposobu działania źródła promieniowania rentgenowskiego. Przedstawiono wpływ zakresu przedziału czasu mierzonego przez miernik na błąd pomiaru.
The main idea of the article is a description of problems of X-ray exposure time measurement. The content describes two types of X-ray machines. Among the two X-ray machine types, continuous type with shutter is more suitable for long time measurement, and pulse type is better for short time measurements. The differences between mode of operation of different X-ray sources and it’s impact on uncertainty of measurement of exposure time are presented. It also discusses the impact of different resolution settings of device under calibration on uncertainty measurement.
Źródło:
Metrologia i Probiernictwo : biuletyn Głównego Urzędu Miar; 2020, 1 (24); 15-20
2300-8806
Pojawia się w:
Metrologia i Probiernictwo : biuletyn Głównego Urzędu Miar
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of X-ray detection systems
Autorzy:
Urbański, Paweł
Grzebyk, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/27315700.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
X-ray detection
X-ray radiation
dosimetry
luminescence
Opis:
The article presents an overview and a classification of X-ray detection methods. The main motivation for its preparation was the need to select a suitable and useful method for detecting signals from a currently developed miniature micro-electro-mechanical system (MEMS) X-ray source. The described methods were divided into passive and active ones, among which can be distinguished: chemical, luminescent, thermo-luminescent, gas ionization, semiconductor, and calorimetric methods. The advantages and drawbacks of each method were underlined, as well as their usefulness for the characterisation of the miniature MEMS X-ray source.
Źródło:
Opto-Electronics Review; 2023, 31, 3; art. no. e146554
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement in traffic state estimation at signal controlled intersections by merging induction loop data with V2X data
Autorzy:
Bley, O.
Kutzner, R.
Friedrich, B.
Schuler, T.
Powiązania:
https://bibliotekanauki.pl/articles/393425.pdf
Data publikacji:
2012
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
komunikacja V2X
V2X communication
Opis:
A proven method to minimise the number of stops at traffic lights is a good coordination of the traffic. The use of vehicle-to-infrastructure (V2X) communication allows new concepts to achieve a better coordination. The here described system comprises both the adaption of the traffic signal control and the improvement of a vehicle's approach to intersections. Both objectives require accurate data concerning the actual traffic state and in particular the current tailback length. Therefore two data sources are used to estimate the current tailback length. Existing detectors at traffic lights are taken as a basis for the estimation. For an enhancement V2X data is used. Equipped vehicles send their current position and speed and thus operate as virtual detectors. In a further step detector counts and the V2X data are merged. The process tested in simulations was implemented within a test site in Braunschweig, Germany.
Źródło:
Archives of Transport System Telematics; 2012, 5, 3; 3-7
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wokół Archiwów X
Around X Archives
Autorzy:
Wardak, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/686084.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
przestępstwa niewykryte
Archiwum X
undetected offences
Police X Archives
Opis:
The article deals with on selected issues related to proceedings in undetected crimes.
W artykule zajęto się wybranymi zagadnieniami związanymi z postępowaniami w sprawach przestępstw niewykrytych.
Źródło:
Acta Universitatis Lodziensis. Folia Iuridica; 2018, 83; 5-6
0208-6069
2450-2782
Pojawia się w:
Acta Universitatis Lodziensis. Folia Iuridica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On an application of generalized semi-infinite optimization
Autorzy:
Tezel Özturan, A.
Powiązania:
https://bibliotekanauki.pl/articles/1070437.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.06.-X
Opis:
Generalized semi-infinite optimization problems are optimization problems having infinitely many constraints. In addition, the infinite index set depends on the decision variable of optimization. In this study, as an application of generalized semi-infinite optimization problems a type of design centering problems is considered. In a general design centering problem some measure of a parametrized body is maximized under the constraint that parametrized body is inscribed in a fixed body. In this study, diamond cutting problem is considered as a type of design centering problems. Here the aim is to maximize the volume of a round cut diamond from functional approximation of a rough irregularly shaped gemstone. First of all, the problem is converted to a generalized semi-infinite optimization problem, then corresponding first order optimality conditions are obtained. Several numerical examples are presented by solving reformulated Karush-Kuhn-Tucker optimality conditions with semismooth Newton method. The advantage of the method is that a linear system of equations has to be solved in each iteration.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 14-16
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Iron Aluminides and Petr Kratochvíl
Autorzy:
Paidar, V.
Powiązania:
https://bibliotekanauki.pl/articles/1402057.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
Opis:
Professor Petr Kratochvíl initiated a modern investigation of this class of materials in our country. He has been interested in various methods how to improve iron aluminides by alloying, precipitation and insertion of hard particles. He also restored the results obtained already in fifties of the last century in the development of so called PyroFerAl that was produced in Czechoslovakia and used, for example, for heat treatment installations. Professor Petr Kratochvíl has been cooperating with leading institutions for material research, for instance, with the Institute of Physics of Materials AS CR in Brno on creep studies or with the Technical University in Ostrava on material formation processes. Since aluminium is near the nonmetals on the periodic table, it can bond with metals differently than do other metals and hence the properties of iron aluminides, in particular, are different from the other intermetallics. These alloys can be also used as functional materials due to their magnetic properties. Iron aluminides are being developed for use as structural materials and/or cladding alloys in fossil energy systems. They have good high temperature mechanical properties and excellent corrosion resistance. These alloys offer relatively low material cost, conservation of strategic elements and a lower density than stainless steels, and thus they have a great potential for substituting steels at elevated temperatures. However, a wider use of these materials is partly hampered by their moderate ductility at ambient temperatures.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 467-469
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frequency Discrimination in a Simultaneous Two-Tone Signal
Autorzy:
Kleczkowski, P.
Pluta, M.
Powiązania:
https://bibliotekanauki.pl/articles/1490294.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.66.-x
Opis:
Discrimination of just noticeable change in pitch has been widely investigated. In contrast, works on discrimination of two simultaneous pitches produced by two tones have been scarce. In this work two methods were used to find the minimum frequency interval in a two-tone at which listeners perceive two distinct pitches. In the first, listeners tuned manually the frequency interval between components in a two-tone. In the second, the frequency interval between tones in a two-tone was switched between five different fixed values, and a pitch of a probe tone was compared with pitches in a two-tone. Both methods were used in two different groups of listeners, musicians and non-musicians. The first method yielded substantially narrower intervals. Both methods revealed that musicians were able to discriminate pitches at narrower intervals than non-musicians. The raw results of tests were evaluated by two approaches, one was based on fitting of the psychometric function and the other on statistical tests.
Źródło:
Acta Physica Polonica A; 2012, 121, 1A; A-120-A-125
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distinguishing Features of Phase Transformation in the Surface Layer of Hardened Steel with (α+γ)-Two-Phase Structure during Plasto-Elastic Loading at Different Rates
Autorzy:
Alekseeva, L. E.
Sinelnikov, V. A.
Filippov, G. A.
Powiązania:
https://bibliotekanauki.pl/articles/1945237.pdf
Data publikacji:
1996-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
Opis:
An effect of loading during uniaxial tension at different rates ranging from 10$\text{}^{-4}$ to 10$\text{}^{-2}$ s$\text{}^{-1}$ on the phase transformation "austenite-martensite" in the surface layer of hardened 0.36%C-14%Ni steel type with an unbalanced (α+γ)-structure has been determined by an X-ray structure analysis. The mechanisms of (γ-α)-transformation through the depth of steel surface layer and character of this transformation propagation along the specimen length depending on external stress value and tension rate have been defined.
Źródło:
Acta Physica Polonica A; 1996, 89, 3; 353-356
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wideband spectral emission measurements from laser-produced plasma EUV/SXR source based on a double gas puff target
Autorzy:
Arikkatt, Antony Jose
Wachulak, Przemysław
Fiedorowicz, Henryk
Bartnik, Andrzej
Czwartos, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/1849155.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Plasma Spectroscopy
X-ray coherence tomography
soft X-ray
Opis:
We present spectral emission characteristics from laser-plasma EUV/SXR sources produced by irradiation of < 1 J energy laser pulse on eleven different double stream gas puff targets, with most intense electronic transitions identified in the spectral range from 1 nm to 70 nm wavelength which corresponds to photon energy from 18 eV to 1240 eV. The spectra were obtained using grazing incidence and transmission spectrographs from laser-produced plasma emission, formed by the interaction of a laser beam with a double stream gas puff target. Laser pulses with a duration of 4 ns and energy of 650 mJ were used for the experiment. We present the results obtained from three different spectrometers in the wavelength ranges of SXR (1-5.5 nm), SXR/EUV (4-15.5 nm), and EUV (10-70 nm). In this paper, detailed information about the source, gas targets under investigation, the experimental setup, spectral measurements and the results are presented and discussed. Such data may be useful for the identification of adequate spectral emissions from gasses in the EUV and SXR wavelength ranges dedicated to various experiments (i.e. broadband emission for the X-ray coherence tomography XCT) or may be used for verification of magnetohydrodynamic plasma codes.
Źródło:
Metrology and Measurement Systems; 2020, 27, 4; 701-719
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza możliwości oczyszczania gazów wylotowych z Hg0 i CO2 na zeolitach syntetycznych otrzymanych z popiołów lotnych
Possibility of Exhaust Gases Purification from Hg0 and CO2 on Synthetic Zeolites from Fly Ash
Autorzy:
Wdowin, M.
Baran, P.
Panek, R.
Zarębska, K.
Franus, W.
Powiązania:
https://bibliotekanauki.pl/articles/1818585.pdf
Data publikacji:
2015
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
popiół lotny
zeolit typu Na-X i Ag-X
Hg0
CO2
fly ash
zeolites types Na-X and Ag-X
Opis:
The paper presents the usage possibility of Na-X zeolite as a sorbent of elemental (Hg0) form of mercury or carbon dioxide (CO2). The research material was zeolite obtained in the hydrothermal reaction of fly ash and an aqueous solution of sodium hydroxide. To improve the adsorption capacity of the zeolite with respect to vapour of mercury (Hg0), the zeolite was silver activated by ion exchange method. As a result a form of Ag-X zeolite was obtained. To determine the influence of a modification on sorption capacity of obtained zeolites (Na-X, Ag-X) were subjected to mineralogical and textural characteristics. Then for both zeolites the Hg0 and CO2 sorption studies were performed. Mineralogical analysis of SEM-EDS showed that the sodium ions have been substituted in its entirety with silver ions. After activation of the specific surface area and the share of mesoropores have decreased. However, the share of micropores increased which is associated with substitutions of Na+ ions by ions with a larger ionic radius i.e. silver. Mercury vapour sorption experiment showed almost immediate breakthrough across zeolite Na-X at a flow rate of gas stream at 80 ml/min. Activation of silver greatly improved sorption capacity of tested zeolite and breakthrough of 5% wt. Hg0 occurred after the time of 13017 min. The time for breakthrough of Hg0 for Ag-X is five times longer than for the commercially available activated carbon modified with bromine (AC/Br). Carbon dioxide adsorption studies have shown little effect for sorption capacity for zeolite with silver, where the result for the zeolite Na-X and Ag-X were similar at average level of 25 cm3g-1 for p/p0 = 0.01 (lower values for Ag-X). From obtained results the constants of Dubinin-Raduszkiewicz and Langmuir isotherms were calculated. The monolayer capacity calculated from the equation of Langmuir have shown the lack of differentiation for both examined samples, indicating that the modification of the starting zeolite with silver ions did not improve the sorption capacity with respect to carbon dioxide. Besides in the considered pressure range sorption capacity of zeolites terms to carbon dioxide decreased slightly. The results indicate that the silver modification improves the adsorption of mercury vapour, but has no effect on the sorption of carbon dioxide.
Źródło:
Rocznik Ochrona Środowiska; 2015, Tom 17, cz. 2; 1306-1319
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$K_{β}/K_{α}$ X-Ray Intensity Ratios for Cr, Mn, Fe, and Co Excited by 8.735 keV Energy
Autorzy:
Yılmaz, R.
Powiązania:
https://bibliotekanauki.pl/articles/1398200.pdf
Data publikacji:
2018-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
K X-ray intensity ratios
X-ray fluorescence
cross-sections
Opis:
In this study, the K shell intensity ratios $K_{β}/K_{α}$ have been experimentally determined for the elements Cr, Mn, Fe, and Co. Measurements have been carried out at 8.735 keV excitation energy by using secondary excitation method. K X-rays emitted by samples have been counted by a Si (Li) detector with 160 eV resolutions at 5.9 keV. The measured values were compared with the calculated theoretical values. The obtained values are in good agreement with the calculated values.
Źródło:
Acta Physica Polonica A; 2018, 133, 5; 1227-1230
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Materiał zeolitowy typu X otrzymany z popiołu lotnego w wyniku syntezy hydrotermalnej i niskotemperaturowej
X type zeolitic materials synthesized from fly ash using hydrothermal and low-temperature methods
Autorzy:
Franus, W.
Powiązania:
https://bibliotekanauki.pl/articles/390457.pdf
Data publikacji:
2010
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
popiół lotny
zeolit X
synteza
fly ash
zeolite X
synthesis
Opis:
W pracy przedstawiono wyniki badań nad możliwością transformacji popiołu lotnego klasy F w materiał zeolitowy. Wykorzystano dwie metody syntezy: hydrotermalną i niskotemperaturową. W wyniku alkalicznych reakcji popiołów lotnych z NaOH w obu przypadkach otrzymano materiał zeolitowy bogaty w fazę Na-X. Zbadano charakter mineralogiczny i właściwości fizykochemiczne otrzymanego materiału oraz przedstawiono możliwości praktycznego wykorzystania.
This study presents the results of experiments dealing with the possibility of transforming F class fly ash into a zeolitic material. Two types of synthesis methods were used in the research: hydrothermal and low-temperature synthesis. As a result of alkaline reaction of fly ash with NaOH, all experimental cases yielded zeolitic material which is rich in Na-X phase. The mineralogical composition as well as the physico-chemical properties in Na-X phase was obtained. The mineralogical composition as well as the physico-chemical properties of the obtained material are explored and the feasibility of practical application is shown.
Źródło:
Budownictwo i Architektura; 2010, 7, 2; 25-34
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scanning Force Microscopy Studies of Implanted Silicon Crystals
Autorzy:
Lekki, J.
Lekka, M.
Romano, H.
Cleff, B.
Stachura, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1945219.pdf
Data publikacji:
1996-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
Opis:
Scanning force microscope has been applied to investigate wear tracks produced during friction coefficient measurements of hard steel ball against ⟨111⟩ silicon crystals implanted with Ar ions. Such treatment causes the stable and significant decrease in friction, despite the total removal of implanted species from the wear track during friction. Scanning force microscope measurements of wear tracks topography supported the former hypothesis assuming the formation of post-implantation dense microcracks structure and subsequent propagation of this structure into the bulk. Such process assures small size of wear particles and a low friction coefficient value. Additionally the microfriction force measurement method was applied to determine the friction coefficient of Si$\text{}_{3}$N$\text{}_{4}$ cantilever and a wear track in Si crystal.
Źródło:
Acta Physica Polonica A; 1996, 89, 3; 315-322
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Oxygen Adsorption on Electronic Structure of Iron Phthalocyanine
Autorzy:
Białek, B.
Brągiel, P.
Powiązania:
https://bibliotekanauki.pl/articles/1945276.pdf
Data publikacji:
1996-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.+x
Opis:
Self-consistent field ab initio calculations were performed in order to determine the electronic structure of iron phthalocyanine (FePc) and its changes under interaction with the O$\text{}_{2}$ molecule. The experimental evidence related to O$\text{}_{2}$ adsorption on phthalocyanine plane was confirmed. The possible charge transfer between phthalocyanine and O$\text{}_{2}$ molecule is briefly discussed. Considerable displacement of energy levels in the case of oxygen adsorption on FePc plane has been noticed.
Źródło:
Acta Physica Polonica A; 1996, 89, 3; 443-449
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Fully Computerized Scanning Tunnelling Microscope
Autorzy:
Chwiałkowski, M.
Klusek, Z.
Kobierski, P.
Olejniczak, W.
Sławski, M.
Witek, A.
Powiązania:
https://bibliotekanauki.pl/articles/1929317.pdf
Data publikacji:
1993-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.80.+x
Opis:
A new, fully computerized and inexpensive, scanning tunnelling microscope was designed and built. Its key design feature is the application of the high sensitivity bimorph, for the coarse positioning of the bimorph is > 0.03 mm and can be divided up to the 12 bit number of steps. The bimorph positioning implies that this microscope is fully computer controlled, and using of bimorph instead of inch-worm implies low cost of the unit. The microscope can create images of the surface in the constant current mode and in the imaging current mode. The presented microscope works with the z-axis analog or digital feedback loop optionally. All parameters of the analog and digital feedback loop are computer controlled. Due to the digital z-axis feedback loop benefits, electron tunneling spectroscopy mode is naturally accessible. The performance of the microscope was tested in air by imaging of surface of HOPG (high oriented pyrolytic graphite).
Źródło:
Acta Physica Polonica A; 1993, 83, 5; 621-628
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure of Zinc-Blende and Hexagonal Semiconductors: Comparative Theoretical Study
Autorzy:
Konior, J.
Kaprzyk, S.
Powiązania:
https://bibliotekanauki.pl/articles/1932096.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.+x
Opis:
Using a self-consistent Korringa-Kohn-Rostoker Green function method and the local density approximation for the exchange and correlation potentials, we calculated the electronic structure and the corresponding densities of states for two semiconducting compounds that exist in both cubic (zinc-blende) and hexagonal (wurtzite and NiAs-type) crystal structures, i.e., for CdSe and MnTe. Due to the use of the same method of calculation for both structures a comparison between the obtained results and finding the factors that determine the difference between the properties of these two phases are possible. The presented local density approximation-Korringa-Kohn-Rostoker results might be of importance for the understanding of the factors that determine the relative stability of different phases of semiconducting compounds.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 269-274
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lattice Dynamics of Metallic Glass Ca$\text{}_{70}$Mg$\text{}_{30}$ on the Model of Bhatia and Singh
Autorzy:
Shukla, M. M.
Campanha, J. R.
Powiązania:
https://bibliotekanauki.pl/articles/1992705.pdf
Data publikacji:
1998-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.50.+x
Opis:
The lattice dynamical studies of the metallic glass Ca$\text{}_{70}$Mg$\text{}_{30}$ by Bhatia and Singh on their model contained two shortcomings, firstly the electron-ion interaction matrix was wrong and secondly, the numerical value of the bulk modulus of the electron gas was accepted arbitrarily. By modifying the electron-ion dynamical matrix and determining all the model parameters from the experimental data, we made a fresh study of the lattice dynamics of Ca$\text{}_{70}$Mg$\text{}_{30}$ and compared it to the earlier studies of Bhatia and Singh and also with experimental phonons.
Źródło:
Acta Physica Polonica A; 1998, 94, 4; 655-660
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Young modulus and microhardness anisotropy in (Pb,Cd)Te solid solution crystallizing in the rock salt structure and containing 5% of Cd
Autorzy:
Łusakowska, E.
Adamiak, S.
Adamski, P.
Kuna, R.
Minikayev, R.
Skupiński, P.
Szczerbakow, A.
Szuszkiewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1055144.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
Opis:
A single crystal of (Pb,Cd)Te solid solution with Cd content equal to 5% was grown by self-selecting vapour growth technique and characterized by powder X-ray diffraction using the X'Pert PANalytical diffractometer and Cu K_{α₁} radiation. The X-ray diffraction pattern refinement demonstrated the fcc structure of the rock-salt type of investigated sample, no precipitates or other crystal phases were detected. The sample chemical composition was determined on the basis of measured lattice parameter value. Next, the Young modulus and microhardness were determined by the nanoindentation for carefully prepared, (001), (011) and (111)-oriented single crystal plates. The slight anisotropy of two parameters mentioned above has been found and compared with available literature data.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 343-346
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation Damage Centers in Cholesteryl Heptanoate
Autorzy:
Sayin, U.
Can, C.
Türkkan, E.
Dereli, Ö.
Ozmen, A.
Yüksel, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399506.pdf
Data publikacji:
2013-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.-x
Opis:
Cholesterol takes part significantly in many biological mechanisms and as important component for manufacture of bile acids, steroid hormones, and several fat-soluble vitamins. To determine magnetic properties of cholesteryl heptanoate $(C_{34}H_{58}O_2)$ which is an important cholesteryl ester in human life and new technology, the single crystals of cholesteryl heptanoate were grown by slow evaporation of concentrated ethyl acetate solution and the grown single crystals were irradiated at room temperature with $\text{}^{60}Co \gamma $ ray. The radical produced by gamma irradiation has been investigated in the range of temperatures 123-330 K for different orientations of the crystal in a magnetic field by EPR. Radiation damage center was attributed to radical $ĊH_α CH_{2β}$. The g factor and hyperfine coupling constants have slight dependence on temperature and evident dependence on the orientation of the magnetic field. Determined g factor and hyperfine coupling constants for the radical $ĊH_α CH_{2β}$ were found to be anisotropic with the average values $g_{av}=2.0036$, $(a_{CH_\alpha})_{av}=14.52 G, (a_{CH_{2\beta}})_{av}=25.78 G$.
Źródło:
Acta Physica Polonica A; 2013, 124, 1; 70-73
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D Imaging of Water Behavior at Millimeter Wavelength
Autorzy:
Sayinti, A.
Kaya, A.
Vertiy, A.
Powiązania:
https://bibliotekanauki.pl/articles/1400037.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.40.-x
Opis:
During the transmission of electromagnetic radiation through a medium containing water molecules, portions of the electromagnetic spectrum are absorbed by water molecules. This water absorption occurs preferentially at certain characteristic wavelengths while the balance of the spectrum is transmitted with minimal effects. This characteristic of water provides advantages but also some disadvantages in science and engineering applications. Especially in remote sensing applications, it may cause to produce incorrect information. So identification of behavior of electromagnetic wave in water is significantly important. Some of the studies based on electromagnetic wave behavior in water are bio-medical researches, sensors, transmitters, accumulators, organic-inorganic materials, and microwave ovens. In this paper, based on the water's absorption of electronic wave property, a plastic cup as half-full of water is imaged using near field microwave system. After being processed with 3D-DLL algorithm it is imaged as 3D with IRIS software. A robotic system is used for data collection process. Transmission and reflection measurements of system are done with N5230A network analyzer.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 467-469
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Normally Hearing Subjects Have No Advantage οf Better Audiograms in Listening Tasks
Autorzy:
Kleczkowski, P.
Pluta, M.
Powiązania:
https://bibliotekanauki.pl/articles/1490276.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.66.-x
Opis:
Some correlation has been found in literature between the amount of mild hearing impairment and lowering of performance in listening tasks. The relationship between measures of hearing acuity and performance in listening tasks in the population of normally hearing subjects has not found a solid evidence. In this work six one-parameter measures of hearing acuity based on audiograms, including three originally proposed by the authors, were used to investigate whether a relationship between those measures and listeners' performance existed. The results of six listening tests were investigated, three with speech, two with musical excerpts and one with everyday sounds. The results showed no correlation between hearing acuity and performance, with the exception of everyday sounds, where some correlation was found. No significant differences between the measures used were found.
Źródło:
Acta Physica Polonica A; 2012, 121, 1A; A-115-A-119
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Boundaries, Martins Axiom, and (P)-properties in dual Banach spaces
Autorzy:
Granero, Antonio S.
Hernández, Juan M.
Powiązania:
https://bibliotekanauki.pl/articles/745016.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Boundaries, Martin's Axiom, equality \(Seq(X^{**})=X^{**}\), super-(P) property
Opis:
Let \(X\) be a~Banach space and \(\mathcal{S} \mathit{eq}(X^{**})\) (resp., \(X_{\aleph_0}\)) the subset of elements \(\psi\in X^{**}\) such that there exists a~sequence \((x_n)_{n\geq 1}\subset X\) such that \(x_n\to \psi\) in the \(w^*\)-topology of \(X^{**}\) (resp., there exists a~separable subspace \(Y\subset X\) such that \(\psi\in \smash{{\overline{Y}^{w^*}}}\)). Then: (i) if \(\operatorname{Dens}(X)\geq \aleph _1\), the property \(X^{**}=X_{\aleph _0}\) (resp., \(X^{**}=\mathcal{S}\mathit{eq}(X^{**})\)) is \(\aleph _1\)-determined, i.e., \(X\)~has this property iff \(Y\) has, for every subspace \(Y\subset X\) with \(\operatorname{Dens}(Y)=\aleph _1\); (ii) if \(X^{**}=X _{\aleph _0}\), \( (B(X^{**}),w^*)\) has countable tightness; (iii) under the Martin's axiom \(\mathit{MA} (\omega _1)\) we have \(X^{**}=\mathcal{S}\mathit{eq}(X^{**})\) iff \((B(X^*),w^*)\) has countable tightness and \(\\overline {\text {co}}(B)=\overline {\text {co}} ^{w^*}(K)\) for every subspace \(Y\subset X\), every \(w^*\)-compact subset \(K\) of \(Y^*\), and every boundary \(B\subset K\).
Źródło:
Commentationes Mathematicae; 2016, 56, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 1499

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