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    Wyświetlanie 1-15 z 15
    Tytuł:
    Non-Wave Variations in Temperature Caused by Sound in a Chemically Reacting Gas
    Autorzy:
    Perelomova, A.
    Pelc-Garska, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493610.pdf
    Data publikacji:
    2011-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.25.-x
    43.20.Bi
    Opis:
    A weakly nonlinear generation of non-acoustic modes in the field of sound in a gas is considered. An exoteric chemical reaction of A → B type, which takes place in a gas, may be reversible or not. Two types of sound are considered, low-frequency and high-frequency as compared with the characteristic time of a chemical reaction. For both these cases, the governing equations of non-acoustic modes are derived and conclusions of the efficiency of their nonlinear generation by sound are made. The character of nonlinear generation of non-acoustic modes by sound depends essentially on reversibility of a chemical reaction.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 3; 455-461
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Structure Perfection Diagnostics of Slightly Distorted Silicon Crystals in the Bragg Case of Diffraction
    Autorzy:
    Khrupa, V.
    Krasulya, S.
    Machulin, V.
    Datsenko, L.
    Auleytner, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964151.pdf
    Data publikacji:
    1997-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Bi
    81.40.-z
    Opis:
    A new approach to structure perfection diagnostics of dislocation-free silicon crystals has been developed using the Bragg case of diffraction. The approach is being based on successive measurements of integral reflectivity and the spatial intensity distribution of reflected beam on the same diffraction planes of a real crystal by means of a single crystal diffractometer.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 5; 981-985
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Evaluation of Homogeneity and Heterogeneity in Metals Processed by High-Pressure Torsion
    Autorzy:
    Figueiredo, R.
    Kawasaki, M.
    Langdon, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418397.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Bi
    61.66.Dk
    Opis:
    Processing through the use of high-pressure torsion is attracting much attention at the present time because of the potential for achieving exceptional grain refinement. In principle, it appears that the thin disks used for high-pressure torsion processing should exhibit significant heterogeneity in the as-processed condition. However, experiments show that the development of homogeneity or heterogeneity is dependent upon the crystalline structure of the material. For high-purity aluminum the as-processed microstructure is very homogeneous after five or more revolutions of torsional straining but for the magnesium AZ31 alloy there is a considerable degree of heterogeneity in the as-processed disks.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 425-429
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure Perfection Diagnostics of Single Crystals by Means of Diffractometry Measurements Using X-Ray Continuous Spectrum
    Autorzy:
    Datsenko, L. I.
    Khrupa, V. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931659.pdf
    Data publikacji:
    1994-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Bi
    81.40.-z
    61.72.Dd
    Opis:
    Determination of the integral characteristics of structural perfection of a real crystal (i.e. Debye-Waller's static factor e$\text{}^{-L}$ and coefficient of absorption lids due to diffuse scattering) is especially expedient using the suitably selected wavelengths of the X-ray continuous spectrum by investigation of the thickness I(t), coordinate I(x) as well as amplitude I(W) dependencies of intensities at Lane or Bragg diffraction. Here W is an amplitude of weak ultrasound vibrations excited in a sample for suppression of the Bragg component of reflectivity.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 4; 579-584
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scattering properties of argon gas in the temperature range 87.3-120 K
    Autorzy:
    Al-Maaitah, I.
    Joudeh, B.
    Sandouqa, A.
    Ghassib, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065068.pdf
    Data publikacji:
    2016-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.25.Bi
    64.10.+h
    67.10.Fj
    Opis:
    A theoretical model, based on the Galitskii-Migdal-Feynman formalism, is introduced for determining the scattering properties of argon gas, especially the "effective" total, viscosity and average cross-sections. The effective phase shifts are used to compute the quantum second virial coefficient in the temperature range 87.3-120 K. The sole input is the Hartree-Fock dispersion (HFD-B3) potential. The thermophysical properties of the gas are then calculated. The results are in good agreement with experimental data.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 6; 1131-1140
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic Nearfield and Farfield for Vibrating Piston in Geometrical and Intensity Formulations
    Autorzy:
    Kozień, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490305.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.20.Bi
    43.20.Tb
    43.40.Rj
    Opis:
    In classic acoustics there are two areas identified around acoustic sources - nearfield and farfield. The nearfield is connected with the Fresnel solution and farfield - the Fraunhofer one. For each regions there are different theoretical formulae for determination of distribution of the chosen acoustic parameter. Unfortunately there is no sharply outlined border between regions. Therefore one of the important problem, is to define approximately conditions for state the border between them. The two attempts for identification are discussed, i.e. geometrical one and intensity ones. The results are shown on the vibrating circular rigid piston case.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1A; A-132-A-135
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of HPLC-MS with Electrospray Ionization for the Qualitative and Quantitative Analysis of Antibiotics in Pharmaceutical Formulation
    Autorzy:
    Likhtarovich, A.
    Luhin, V.
    Sovastei, O.
    Zukowski, P.
    Dado, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402227.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.10.Bi
    33.15.Ta
    82.80.-d
    Opis:
    This study describes the application of electrospray ionization mass spectrometry in order to identify ten antibiotics (macrolides, penicillins, aminoglycosides). An optimum procedure was developed for determination of antibiotics of different grade. Positive ion spectra of most antibiotics are higher in intensity including an [M+H]⁺ ion and produce less fragmentation and are more informative compared to the negative ion spectra. The group of antibiotics exhibits the same characteristic fragmentation. The data base was developed for identification of antibiotics comparing of their molecular and fragment ions. The results of the study showed that the method with electrospray ionization is simple and quick which is useful in the routine determination of antibiotics and in their pharmaceutical dosage forms.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 901-904
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification and Fragmentation of Cefalosporins, Lincosamides, Levofloxacin, Doxycycline, Vancomycin by ESI-MS
    Autorzy:
    Sapon, A.
    Luhin, V.
    Sovastei, O.
    Spanik, P.
    Bondariev, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030206.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.10.Bi
    33.15.Ta
    82.80.-d
    Opis:
    The aim of the paper is the identification of the most frequently used antibiotics such as cefazolin, cefuroxime, cefotaxime, ceftriaxone, ceftazidime, lyncomycin, clindamycin, levofloxacin, doxycycline and vancomycin by electrospray ionization mass spectrometry interface in positive and negative modes. The fragmentation pathways of the group of antibiotics were colligated on the basis of the obtained ESI mass spectra. Generally, the positive ion spectra of antibiotics are higher in intensity including an [M+H]⁺ ion and producing less fragmentation as well as more informative compared to the negative ion spectra. Only ESI of levofloxacin in positive and negative modes with the chosen tune parameters leads to degradation of molecular ion, so the parent ion does not appear in the mass spectra. The group of antibiotics (cephalosporins and lincosamides) shows the same characteristic fragmentation. These setup parameters were successfully applied for the routine determination of antibiotics in their pharmaceutical dosage forms and other objects. Data base was developed for identification of antibiotics by comparison of their molecular and fragment ions.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 236-239
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Low Frequency Approximation of the Sound Radiation Power of Two Vibrating Circular Pistons Embedded in Two Different Rigid Planes of a Three-wall Corner
    Autorzy:
    Rdzanek, W.
    Szemela, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1196854.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.20.Bi
    43.20.El
    43.20.Fn
    43.20.Rz
    Opis:
    The problem of sound radiation by a system consisting of two vibrating circular pistons embedded in two of three different planes perpendicular to one another forming a three-wall corner is considered. The earlier published results dealing with the sound radiation by sources vibrating in a three-wall corner are the basis of analysis. According to the earlier studies, the exact formulae for acoustic power of radiation of two circular pistons are used. The formulae are expressed as double Fourier integrals. The active and reactive, self and mutual, components are separated from them as well as the corresponding expressions of the acoustic power of mirror images of the piston sources. The acoustic power of the two sources are expressed in the form of the Rayleigh formulae whereas, in the case of the mirror images, it is expressed in the form of the single series expansion containing spherical Bessel and Neumann functions. In the case of the mutual acoustic power of the sources, approximate formulae are presented for low frequencies. On the basis of the results obtained, the corresponding formulae valid for a two-wall corner are presented as the limiting transitions. All the results presented can be useful, e.g. in designing the room acoustics and outdoor system everywhere the free field conditions are disturbed by the acoustic waves reflected at rigid vertical walls for the wavelengths being considerably shorter than the geometric sizes of the walls.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4A; A-135-A-143
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic Impedance of an Annular Piston Wobbling in a Flat Screen Around a Semi-infinite Circular Cylinder
    Autorzy:
    Pieczonka, D.
    Rdzanek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400095.pdf
    Data publikacji:
    2013-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.20.Bi
    43.20.El
    43.20.Fn
    43.20.Rz
    Opis:
    A rigorous solution is presented for the problem of sound radiation by an oscillating and wobbling annular piston embedded concentrically in a perpendicular flat screen surrounding a semi-infinite circular cylindrical baffle. Two forms of the Green's function of the considered region are used. The acoustic impedance is presented in its integral form useful for numerical calculations which enable studying the effect of the acoustic waves scattering on the cylindrical baffle and the asymmetry of vibration velocity on the piston on the resultant acoustic impedance of the wobbling piston. It is shown that in the case of the vibrating piston under consideration, the reciprocity of acoustic impedance related to two modes of rigid body motion, oscillating and wobbling, does not occur.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 6; 1078-1084
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Total Acoustic Power of Two Concentric Clamped Circular Plates Vibrating in a Fluid
    Autorzy:
    Rdzanek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402179.pdf
    Data publikacji:
    2015-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.20.Bi
    43.20.El
    43.20.Fn
    43.20.Rz
    Opis:
    This study focuses on the problem of sound radiation by two concentric clamped flat plates, circular and annular, into the half-space. The system of three coupled differential equations comprising two equations of motions of plates and the wave equation, is solved exactly. Vibrations of plates are axisymmetric and time-harmonic with a single excitation frequency. The initial phase difference of excitations can be nonzero. Attenuation due to fluid loading and material damping is included. Kirchoff-Love and Kelvin-Voigt theories are applied. The effect of initial phase difference of excitations on the acoustic power radiated is examined as well as errors resulting from neglecting the fluid loading.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 1A; A-41-A-45
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Orientation of Single Dibenzanthanthrene Molecules in Solid Xenon
    Autorzy:
    Sepioł, J.
    Kołos, R.
    Jasny, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814017.pdf
    Data publikacji:
    2007-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.50.-j
    61.66.Bi
    61.66.Hq
    61.72.Ww
    Opis:
    The spatial distributions of individual dibenzanthanthrene electronic transition dipole moments in solid Xe was investigated at the single molecule level, with the high-resolution fluorescence spectroscopy. Samples were prepared by the co-deposition of dibenzanthanthrene/Xe vapours onto the 50 K surface. The results indicate that the orientation of planar aromatic molecules is preferentially parallel to the trapping surface.
    Źródło:
    Acta Physica Polonica A; 2007, 112, S; S-121-S-126
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Macroscopic and Microscopic Descriptions of the Plastic Deformation of Fcc Metals over a Wide Range of Strain and Temperature
    Autorzy:
    Csanádi, T.
    Chinh, N.
    Gubicza, J.
    Langdon, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419113.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Bi
    83.50.Uv
    65.40.-b
    81.40.Jj
    61.72.Cc
    Opis:
    The plastic behavior of face-centered cubic metals was investigated over a wide range of strain and testing temperature. The experimental stress-strain data were described using both macroscopic and microscopic, well-established relationships. The characteristics of these descriptions are discussed and compared with each other. The analysis of the characteristics leads to a definition of the low and high temperature deformation regions, where the kinetics of both the dislocation-multiplication and the dislocation-annihilation (recovery) are different. For pure aluminum, it is shown that the boundary between these two regions occurs at a homologous temperature of the order of $\approx 0.5 T_{m}$ where $T_{m}$ is the absolute melting temperature. From this analysis, correlations are also drawn between the macroscopic parameters describing the stress-strain relationship and the fundamental characteristics of the microscopic processes both at room temperature and elevated temperatures.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 630-633
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NiTi shape memory marformed alloy studied by electron beam precession TEM orientation mapping method
    Autorzy:
    Świec, P.
    Zubko, M.
    Lekston, Z.
    Stróż, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1055112.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.fg
    62.20.F-
    61.43.Dq
    61.66.Bi
    68.37.Ef
    62.25.-g
    64.70.Nd
    Opis:
    Severe plastic deformation by cold-rolling in martensitic state was applied to Ni_{50.4}Ti_{49.6} shape memory alloy. Received materials with 17, 20, 25, and 35% deformation were further annealed at 450°C for 15 min. After such treatment hardness of this alloy increased significantly reaching 365 HV0.5 for highest deformation degree. Calorimetric studies revealed two-stage and two-step character of martensitic transformation occurring in all specimens. Nanocrystalline structure with average grain size 53, 34, 28, and 24 nm was obtained. In material with 35% of deformation amorphous regions containing a nuclei of B2 parental phase with average size of 5 nm were observed. To determine the crystallographic orientation of observed nanograins and for better phase analysis, electron beam precession transmission electron microscopy orientation mapping was performed.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1307-1310
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion and Electron Beam Induced Luminescence οf Rare Earth Doped YAG Crystals
    Autorzy:
    Gawlik, G.
    Sarnecki, J.
    Jóźwik, I.
    Jagielski, J.
    Pawłowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504113.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.60.Hk
    52.59.Bi
    79.20.Rf
    61.80.Lj
    41.75.Ak
    41.75.Cn
    61.72.S-
    61.72.-y
    29.40.-n
    77.84.Bw
    79.60.Ht
    87.53.Bn
    78.55.-m
    78.60.-b
    77.55.Px
    77.55.-g
    25.40.Lw
    Opis:
    The aim of this work was the evaluation of ion-beam induced luminescence for the characterization of luminescent oxide materials containing rare earth elements. The yttrium aluminium garnet epilayers doped with Nd, Pr, Ho, and Tm atoms were used. The ion-beam induced luminescence spectra were excited using 100 keV $H_2^{+}$ ion beam and were recorded in the wavelengths ranging from 300 nm up to 1000 nm. The separate parts of the surface of the same samples were used for ion-beam induced luminescence and cathodoluminescence experiments. Cathodoluminescence spectra have been recorded in the range from 370 nm up to 850 nm at 20 keV e-beam in scanning electron microscope equipped with a grating spectrometer coupled with a photomultiplier. The observed narrow ion-beam induced luminescence lines can be ascribed to the well known radiative transitions in the rare-earth ions in the YAG crystals. The cathodoluminescence spectra reveal essentially the same emission lines as ion-beam induced luminescence. The decrease of the ion-beam induced luminescence lines intensity has been observed under the increasing ion fluences. The ion-beam induced luminescence may be used for characterization of transparent luminescent materials as an alternative method for cathodoluminescence and can be especially useful for observation of ion-beam damage formation in crystals.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 181-183
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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