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    Wyświetlanie 1-15 z 15
    Tytuł:
    Freezing in Halide Salts
    Autorzy:
    Akdere, Ű.
    Yilmaz, M.
    Kavanoz, H.
    Taşseven, Ç.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812355.pdf
    Data publikacji:
    2008-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.20.-p
    64.70.D-
    Opis:
    The static criterion that the amplitude of the principal peak of the liquid structure factor has a constant value along the freezing line and the onset of freezing are studied from the structure factors and the static dielectric functions of halide salts interacting via the effective pair potentials through the hypernetted-chain approximation. It is observed that the criterion above is restricted to the effective charge difference. The critical value of plasma parameter at freezing is affected by the mobility and number concentration of anions and cations. The distribution of the value of the static dielectric function closest to the wave number axis in the negative region is also determined by the charge difference and the ordering of ions and related to the onset of freezing.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 6; 1659-1670
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local Structural Features of Metallic Alloys: $Ni_{33}Zr_{67}$ and $Ni_{50}Zr_{50}$
    Autorzy:
    Khusnutdinoff, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398357.pdf
    Data publikacji:
    2016-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.20.Ja
    61.20.-p
    61.43.Fs
    Opis:
    In this work we present the results of computer simulations molecular dynamics of the metallic alloys: $Ni_{33}Zr_{67}$ and $Ni_{50}Zr_{50}$. The critical glass-forming temperatures are defined from the behavior change of the Wendt-Abraham parameters of the studied systems. We have found that the increase in the concentration of nickel in the system NiZr leads to displacement of the critical glass-forming temperature in higher temperature region. It is shown that the structural transformations which were observed in the $Ni_{50}Zr_{50}$ system are not related with crystallization processes.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 3; 293-296
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Dispersion in Liquid Alkali Metals
    Autorzy:
    Gajjar, P. N.
    Thakore, B. Y.
    Jani, A. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968966.pdf
    Data publikacji:
    1998-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.20.-p
    61.25.Mv
    63.20.Dj
    Opis:
    A local pseudopotential in the second-order perturbation theory is used to study the electron dispersion relation, the Fermi energy and deviation in the Fermi energy from free electron value for the liquid alkali metals. The influence of the five different forms of the local field correction functions on the aforesaid electronic properties is examined explicitly, which reflects the varying effects of screening. The depth of the first negative hump in the electron dispersion curves of the liquid alkali metals increases in the order Na, K, Rb, Cs.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 1; 33-40
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Resolution Density Map as the Visualization of a Larger Time Scale Molecular Dynamics
    Autorzy:
    Karbowniczek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1189870.pdf
    Data publikacji:
    2015-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.20.-p
    64.70.dm
    61.20.Ja
    Opis:
    A method of visualization of two-dimensional systems of particles in a large time scale molecular dynamics with application to the domain reorientation process in 2D Lennard-Jones system is presented. The described processing is general and can be used in comparing experimental results of atomic force microscopy with the results calculated using a computer as well as for predicting new phenomena. Domain reorientation process in 2D Lennard-Jones system approaching equilibrium is presented and confronted with the Fourier analysis of the data obtained for different initial parameters and at different states of aggregation. New border domain features accompanying this process are discussed.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 6; 1644-1647
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Distribution of Biological Particles Suspended in Normal Cerebrospinal Fluid (CSF)
    Autorzy:
    Staroń, W.
    Herbowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537551.pdf
    Data publikacji:
    2010-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.M-
    02.50.-r
    61.20.-p
    Opis:
    Cerebrospinal fluid's functions are protecting, expelling and transporting which are influenced by properties of the fluid. Disorder of one of the functions may bring a disease. Cerebrospinal fluid mainly consists of water (99%), cells and proteins suspended in it. Due to the suspension it can be considered as dispersion medium. Every dispersion medium is characterized by the parameters of particles suspended in it. Parameters of dispersion medium may be classified as single or cumulative parameters. Hence, there is possible to determine additional parameters which characterize CSF in order to give full description of the fluid. The authors present results of research on suspension in normal cerebrospinal fluid worked out on the basis of 2500 microscoping pictures and they also give a statistical analysis of particle diameters. The paper is a part of research project on "Physico-chemical processes in cerebrospinal fluid obtained by puncture from patients diagnosed with the disorders of cerebrospinal fluid (CSF) circulation" realized by Institute of Physics, University of Szczecin in co-operation with Neurosurgery Ward of Public Provincial Hospital Complex in Szczecin.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 1; 159-160
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solvation of Alcohols in n-Heptane and n-Propanol from the Acoustic Passynski Method
    Autorzy:
    Gliński, J.
    Burakowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811514.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.35.Bf
    43.35.+d
    61.20.-p
    61.20.Qg
    Opis:
    The method of Passynski of calculating the solvation numbers from compressibility was applied to solutions of short-chained normal alcohols in n-heptane and n-propanol. The dependences of solvation numbers on length of the solute molecules are surprisingly similar for both solvents. Applicability of the acoustic method for determining the solvation numbers in nonaquous systems, as well as for investigation of intermolecular interactions in them was proved. Some structural similarity of associated alcohol and hydrocarbon in liquid state is suggested.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-109-A-113
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydration of the Zwitterionic Forms οf Amino Acids from the Acoustic Passynski Method
    Autorzy:
    Burakowski, A.
    Gliński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811531.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.35.Bf
    43.35.+d
    61.20.-p
    61.20.Qg
    Opis:
    In this communication, we report the compressibility measurements made on amino acids in water at 25°C, compared with aqueous short-chained amines and carboxylic acids. The effect of the charge caused by protonation of the amino group and/or deprotonation of the carboxylic one was tested. The concept of additivity of the hydration number with the constituents of solute molecule was applied and discussed.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-39-A-44
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary Analysis of Size Distribution of Objects Suspended in Normal Cerebrospinal Fluid in Case of Venticular Hydrocephalic Enlargement and Internal Hydrocephalus
    Autorzy:
    Staroń, W.
    Kubisz, L.
    Herbowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490409.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.M-
    02.50.-r
    61.20.-p
    Opis:
    The paper presents preliminary analysis of normal non-coloured cerebrospinal fluid obtained from patients diagnosed due to suspicion of cerebrospinal fluid malabsorption. According to the findings, the normal cerebrospinal fluid was classified into two groups: A - with clinical diagnosis of ventricular hydrocephalic enlargement and B - with clinical diagnosis of internal hydrocephalus. The analysis of microscopic pictures of normal cerebrospinal fluid in both groups according to numbers and sizes of suspended objects was performed with the aid of Eclipse 600 microscope (with magnification of 1200×) working with a computer by a digital video camera. The authors observed that there is a significant difference in a shape of the distribution curve of objects' diameters between groups A and B. The maximum number of objects in group A was recorded within the range from 5 to 10 μm in diameter size whereas in group B the maximum was recorded within the range from 0.5 to 5 μm in diameter size.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1A; A-046-A-048
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Large-Scale Nanosecond Simulations of the Dynamics of the Xe + H$\text{}_{2}$O System
    Autorzy:
    Kholmurodov, K.
    Seifert, Z.
    Rączkiewicz, K.
    Nitka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047167.pdf
    Data publikacji:
    2006-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.Qg
    61.20.-p
    61.50.Ah
    81.10.Aj
    91.60.Gf
    Opis:
    Large-scale molecular dynamics simulations of the high-pressure transformations of the xenon/water system were performed involving special purpose molecular dynamics machines. We investigated several systems of different sizes and geometry at the suitable simulational conditions (density, temperature, etc.), which are similar to the experiments conducted on the xenon hydrates. A binary mixture (ice water + Xe) undergoes at high pressure a long evolution and the Xe-guest atoms, enclosed inside the water molecules, were observed and analyzed. Even for the thin slabs, starting with the capture of the guest atoms by the water molecules, the water clusters around the xenon atoms are formed. The results show that such a hydrate-like formation preserves its structural stability over a long period of the simulation time of order of nanosecond. The molecular dynamics simulations were performed on a basis of the MDGRAPE-2 modifications of the DL$\text{}_{P}$OLY general purposes package, with the efficient treatment of the Ewald real and reciprocal-space components of the Coulombic and Van der Waals forces. The MDGRAPE-2 accelerates the calculations of the Coulomb and Van der Waals forces, without applying a spherical cut of a fixed distance. 31.15.Qg, 61.20.-p, 61.50.Ah, 81.10.Aj, 91.60.Gf
    Źródło:
    Acta Physica Polonica A; 2006, 110, 6; 759-767
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Glass and Glass-Ceramics Produced from Fly Ash and Boron Waste
    Autorzy:
    Ercenk, E.
    Sen, U.
    Bayrak, G.
    Yilmaz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1181592.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Fs
    64.70.P-
    61.05.cp
    81.70.Pg
    62.20.Qp
    Opis:
    In the current study, the effect of boron waste addition on some properties of fly ash based glass and glass-ceramics were investigated. The powder compositions including 10, 30, and 50 wt% boron waste was prepared. All the investigated compositions were melted at 1500C by using electrical furnaces. Melting structures were cast into the graphite mold. Thus, fly ash-boron waste based glass materials were produced. To transform the glass-ceramic, crystallization process was performed. Crystallization and glass-transition temperatures were determined by differential thermal analysis. Highly dense and crystalline materials, predominantly composed of diopside and augite together with tincalconite and residual glassy phase, were detected by X-ray diffraction analysis after heat treatment at 800, 900, and 1000C for 1 h. For the glass and glass-ceramic samples, mechanical tests such as hardness and fracture toughness were realized. A boron waste addition has a positive effect on the hardness of the specimens unlike the fracture toughness results. Furthermore, produced glass-ceramic materials were characterized via scanning electron microscopy.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 626-628
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Electron Mobility in Some "Problematic Materials" from Magnetoresistance Effect at High Magnetic Fields
    Autorzy:
    Shchennikov, V.
    Kar'kin, A.
    Ovsyannikov, S.
    Morozova, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418952.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.My
    62.50.-p
    61.80.-x
    72.20.Jv
    Opis:
    Using examples of some perspective electronic materials (HgSeS, $Fe_3O_4$, InN, and others) it is shown that magnetoresistance data at high magnetic fields allow evaluating the true values of mobility of charge carriers in spite of any "adverse factors". Additional impacts involving high pressure and irradiation with high-energy particles (neutrons, electrons, ions) produce the enhancement of magnetoresistance technique of testing and allow to go into details of the type of electron structure and scattering mechanisms of charge carriers.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 544-547
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of a Water-Soluble Ionic Polyacetylene Derivative
    Autorzy:
    Gal, Y.
    Jin, S.
    Park, J.
    Lim, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398739.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.L
    73.61.P
    78.20.C
    78.30.J
    Opis:
    A new water-soluble ionic polyacetylene was synthesized by the acid-catalyzed polymerization of 2-ethynylpyridine using acrylic acid. The polymerization proceeded well to give a high yield of polymer. The acetylenic C ≡ C bond stretching (2110 cm¯¹) and acetylenic ≡ C-H bond stretching (3293 cm¯¹) peaks of 2-ethynylpyridine monomer were not seen in the FT-IR spectrum of polymer. The electro-optical and electrical properties of the ionic polyacetylene were measured and discussed. The resulting polymer showed strong maximum at 513 nm in the UV-Visible absorption, which is corresponding to photon energy of 2.42 eV. The energy gap width of polymer was estimated to be of 2.08 eV. It was observed that the electrochemical process of polymer is reproducible in the potential range of -1.80 to 1.60 V vs Ag/AgNO₃. HOMO and LUMO levels of polymer were 4.85 eV and 2.77 eV, respectively.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 642-646
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time Resolved IR and X-Ray Simultaneous Spectroscopy: New Opportunities for the Analysis of Fast Chemical-Physical Phenomena in Materials Science
    Autorzy:
    Marcelli, A.
    Hampai, D.
    Xu, Wei
    Malfatti, L.
    Innocenzi, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808498.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.85.Qe
    61.05.cj
    82.20.-w
    78.47.-p
    Opis:
    New powerful sources and advanced analytical techniques have been considered in the last decade to face up the continuously increasing scientific demands, in particular, in materials science. As an example, nano- science and nanotechnology researches are characterized by ultimate spatial resolution, fast and ultrafast time-resolved analysis, but the complexity of the investigated phenomena requires new analytical capabilities and new experimental techniques were introduced in the research arena. The availability all over the world of brilliant synchrotron radiation sources offers incredible opportunities. Many challenging experiments were made possible by these sources and understanding of many complex dynamical problems was obtained. Nevertheless, a strong demand of new analytical approaches, mainly based on concurrent and possibly simultaneous time-resolved experimental techniques, is emerging. Pioneering time resolved experiments combining X-ray and infrared radiation with a conventional source were performed more than a decade ago. Nowadays, many beamlines at third generation synchrotron radiation facilities are equipped with conventional sources to allow complementary techniques and the strategy of a concurrent analysis is mandatory in the investigation of many phenomena in frontier multidisciplinary researches. Moreover, new opportunities will be available by means of concurrent spectroscopic experiments investigating complex phenomena on a short timescale, from the sub-second to the microsecond time domain. We will present and discuss researches where the combination of IR and X-ray simultaneous experiments may return unique information on complex dynamical processes and phase transitions occurring in materials science. Finally, we will briefly describe the conceptual layout of a synchrotron radiation beamline to perform concurrent IR and X-ray experiments.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 489-500
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Pressure Treatment up to 25~GPa of Czochralski Grown Si Samples Containing Different Admixtures and Defects
    Autorzy:
    Shchennikov, V.
    Shchennikov, Vs.
    Korobeynikov, I.
    Morozova, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399450.pdf
    Data publikacji:
    2013-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.uf
    81.40.Vw
    72.20.Pa
    62.50.-p
    05.70.Fh
    Opis:
    The thermoelectric properties of a set of single crystalline Si wafers with different oxygen concentration grown by the Czochralski technique have been studied at ultrahigh pressures up to 25 GPa. The dependence of semiconductor-metal transition pressure at Czochralski grown Si on the concentration $c_{O}$ of the interstitial oxygen was found to present a convex curve with the maximum near $c_{O} \approx 9 \times 10^{17} cm^{-3}$. The high pressure thermoelectric power method seems to be suitable for characterization of impurity-defect structure of Si wafers. For $Si_{1 - x}Ge_{x}$ crystals (1% < x < 3%) the strong changes of both the value and the sign of thermoelectric power have been observed at pressures much less than ones of Si-I → Si-II transition. From nanoindentation data the phase transition Si-I → Si-II, corresponding to semiconductor-metal electronic transformation has been detected at the loading up to ≈ 10 mN. These findings suggest a way for creation of integrated circuits, in which zones with different types of conductivity and hence different p-n, p-n-p etc. structures may be "written" by applied stress at nanoscale level, and the control on the value of the above stresses now is possible by the proposed nanoindentation technique.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 2; 244-249
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Transparent and Nanocrystalline $TiO_{2}:Nd$ Thin Films Prepared by Magnetron Sputtering
    Autorzy:
    Domaradzki, J.
    Wojcieszak, D.
    Prociow, E.
    Kaczmarek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807648.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.82.Rx
    68.55.-a
    68.60.-p
    68.60.Dv
    78.20.-e
    Opis:
    In this work structural and optical properties of $TiO_{2}$ thin films doped with different amount of Nd have been outlined. The result have shown that by quantity of Nd amount in the film dense nanocrystalline or amorphous thin films were obtained.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-75-S-77
    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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