Artykuły naukowe (WMFT): Recent submissions
Now showing items 381-400 of 759
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Aparat do znajdowania przedmiotów metalowych
(1990)Operation principles of the apparatus for cable ducts and metal tubles location are presented. Main constructional data of a prototype and its parameters are described. -
Projektowanie pomocy dydaktycznej i analiza metody pomiarowej w ćwiczeniach laboratoryjnych na przykładzie wahadła rewersyjnego
(1990)The using of computer for optimization of measurement method on the base of the reverse pendulum. -
Przyrząd z programowaną regulacją różnicy temperatury
(1990)Principle of operation and construction of device with programmed regulation of temperature difference. Basic parameters of device and example measurements of Seebech coefficient in $NaNbO_3$ were shown. -
Własności kryształów HgJ[2] i ich wykorzystanie w detekcji promieniowania γ
(1990)This paper present the optical spectra of red tetragonal HgJ[2] single crystal were investigated at 4.2K and 79K in 2-6eV region of photon energy and application obtain results in construction γ-ray detectors. -
Analiza izotropowego widma EPR K[3][Cr(Cn)[5]NO[3]]
(1990)Two methods: stick diagram approach and microcomputer simulation for interpretation of the isotropic ESR spectrum of water solution of K3[Cr(Cn)[5]NO] complex were described in terms of possible didactic purposes. -
Optyczne metody diagnostyki plazmy
(1990)The application to the atomic spectroscopy of the electric arc plasma is described. The states of plasma equilibrium are discussed. A method of the precise evaluation of the line profile (or the total intensity), corrected ... -
Zależność struktury kryształów typu A B od ładunków efektywnych rdzeni atomowych
(1990)The concept of electronegativity was used in this work to analyze the stability of AB type crystalline structures. The parameters of the dependence between ion energy and the charge were adjusted applying a new method. The ... -
Termodynamiczne aspekty przejść fazowych ferroelektryk-paraelektryk
(1990)This work is a theoretical introduction to the problem of the phenomenology of phase transition. A particular attention was paid to the characterization of ferroelectric transitions of the kind of order-disorder. The ... -
Charakterystyki prądowo-napięciowe ferroelektryków
(1990)The review of the most important theoretical considerations explaining the shape of I-V characteristics for ferroelectric materials is done. The assumptions and calculations proposed by Fridkin-Kreher and Krapivin-Chensky ... -
Dielektryczne własności tytanianu sodowo-bizmutowego Na[0.5]Bi[0.5]TiO[3]
(1990)The experiments were carried out on dielectric ceramic sodium – bismuth titonate for some frequence of the applied electric field. The effect of the applied constant electric field on the shift temperature of the phase ... -
Fotoferroelektryczne zjawiska w monokryształach $(Ba, Sr) Nb_2O_6$
(1990)Influence of illumination on phase transition temperature, on dielectric permittivity and on pyro currents in $Ba_xSr_{1-x}Nb_2O_6$ was studied. Dependence of photoelectretic charge density on temperature in the region of ... -
Własności dielektryczne monokryształów $Pb(Cd_{1/3}Nb_{2/3})O_3$
(1990)The temperaturę dependence of ε and tgδ was investigated for monocrystalline sample of $Pb(Cd_{1/3}Nb_{2/3})O_3$ various measurement field frequencies. A strong connection between dielectric properties and field frequency ... -
Przejście fazowe antyferroelektryk - paraelektryk w niestechiometrycznym $NaNbO_3$
(1990)The theory of AFE-PE phase transformation as formulated by Kittel is reviewed. The experimental values obtained from dielectric measurements are related, to the parameters of Kittel's thermodynamic function. Some of the ... -
Klasyfikacja stałych roztworów na bazie $NaNbO_3$
(1990)The criterion of division solid solutions, based on sodium niobate in to ferro-, and antiferroelectric materials is described. The results of measurements are compiled in the table. -
Zmiany temperaturowe współczynnika rozszerzalności liniowej $NaNbO_3$
(1990)The operation principle of a dilatometer is described. The temperature changes of the coefficient of linear expansion were measured in temperature range between minus 196°C and plus 740°C. Linear expansion coefficient ... -
Effect of compressive stress on dielectric and ferroelectric properties of 0.25PSN-0.75PLuN ceramics
(2003)The PSN-PLuN solid solutions have been prepared in the whole composition range for the first time. The dielectric, pyroelectric and hysteresis loops measurements of the 0.25PSN-0.75PLuN ceramics stress-free or under the ... -
Electric properties of polycrystalline $PbCd_{1/3}Ta_{2/3}O_3$
(1999)The temperature dependence of linear expansion, electric permittivity and electric conductivity has been investigated in the region of the diffuse phase transition. The electric properties of polycrystalline $PbСd_{1/3 ... -
Electrical properties of $Na_{0.98}Li_{0.02}NbO_3$ under axial pressure in phase transition region
(2003)The measurements of electric properties of $Na_{0.98}Li_{0.02}NbO_3$ ceramics for stress-free or samples under stress have been carried out. It was found that incorporation of Li-cations (2% mol) in antiferroelectric ... -
Investigation of dielectric properties of $Li_xNa_{1−x}NbO_3$ ceramics for x = 1 and x = 4
(1999)The a.c. electrical response of $Li_xNa_{1−x}NbO_3$ (LNN) solid solution in low frequency range (100 Hz–20 kHz) has been analysed as a function of temperature (300 K–750 K). A complex picture of the dependence of the ...