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    Wyświetlanie 1-14 z 14
    Tytuł:
    Vapour Absorption in Melamine-Formaldehyde Resin
    Autorzy:
    Wawryszczuk, J.
    Ciesielski, K.
    Goworek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2025738.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    36.10.Dr
    61.41.+e
    66.30.-h
    Opis:
    The effects of vapour absorption on positron annihilation in cross-linked polymer were investigated. Contrary to linear polymers, absorption of vapour in cross-linked resin leads to the shortening of o-Ps lifetime. In vacuum absorbed molecules diffuse out. At room temperature desorption of hexane and hexanol is not complete; full elimination of absorbed molecules requires sample temperature increase.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 3-4; 523-528
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Controlled Porosity of MCM-41 Obtained by Partial Blocking of Pores by Silicon Oil
    Autorzy:
    Gorgol, M.
    Krasucka, P.
    Goworek, J.
    Zaleski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033928.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    36.10.Dr
    61.43.Gt
    68.43.-h
    Opis:
    Partial blocking of mesopores in the ordered MCM-41 silica by DC550 silicon oil was proposed as a preparation method of the material with controlled porosity and fixed pore size. The porosity of the samples with various content of DC550 was examined with the use of low temperature nitrogen sorption and positron annihilation lifetime spectroscopy. It was shown that the oil blocks the primary pores by forming the plugs near its entrances, but also partially locates in the interparticle spaces. The comparison of the results obtained from both investigation techniques was used to make the first attempt to obtain the calibration of ortho-positronium intensity, depending on pore volume. This is necessary to improve the utility of positron annihilation lifetime spectroscopy as a porosimetric technique. The need to take the migration of positronium to larger free volume into account is discussed.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1559-1563
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron annihilation study of iron oxide nanoparticles in mesoporous silica MCM-41 template
    Autorzy:
    Surowiec, Z.
    Wiertel, M.
    Zaleski, R.
    Budzyński, M.
    Goworek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148449.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    positron annihilation
    Mössbauer effect
    MCM-41 porous silica
    superparamagnetic nanoparticles
    Opis:
    The subject of investigation were the samples obtained by impregnation of MCM-41 template with an aqueous solution prepared from Fe(NO3)3ź9H2O. As a result of such a procedure, iron oxides deposits on MCM-41 were formed. The Mössbauer studies revealed an occurrence of Fe3O4 nanocrystallites in the both ferri- and superparamagnetic states. Almost 80% small particles exist in a paramagnetic state. The positron annihilation lifetime spectroscopy (PALS) spectra were measured in air or in vacuum. The long-lived ortho-positronium (o-Ps) components and their intensities are time dependent due to air molecules interaction with iron oxide nanocrystallites and silica walls surfaces. The adsorption of air on the nanocrystallites surface causes a total screening of their surface and a raise of the o-Ps lifetime values. Observed anti-quenching effect is a result of competition of two phenomena: practically switching off a pick-off mechanism related to interaction of o-Ps with magnetite nanoparticles and considerably weaker usual quenching by paramagnetic oxygen molecules.
    Źródło:
    Nukleonika; 2010, 55, 1; 91-96
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Nanoparticles in MCM-41 Type Mesoporous Silica
    Autorzy:
    Surowiec, Z.
    Bierska-Piech, B.
    Wiertel, M.
    Budzyński, M.
    Goworek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811605.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Bf
    81.07.Bc
    76.80.+y
    Opis:
    Structural phase transformations and magnetic properties of mesoporous MCM-41 template modified with iron and nickel salts were studied by nitrogen physisorption, X-ray diffraction, Mössbauer spectroscopy and transmission electron microscopy. The FeNi-oxide or the bimetallic crystal structure is formed for low and high Ni concentrations, respectively. The average size of nanoparticles is about 10 nm. About 70% of particles exist in a superparamagnetic state at room temperature.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1605-1613
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer study of magnetite nanowire in MCM-41 type mesoporous silica templates
    Autorzy:
    Surowiec, Z.
    Goworek, J.
    Ryczkowski, J.
    Budzyński, M.
    Wiertel, M.
    Sarzyński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148203.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    hyperfine interactions
    Mössbauer effect
    MCM-41 silica
    nanowires
    Opis:
    Arrays of Fe3O4 nanowires embedded in mesoporous ordered silica were obtained in two ways: dissolving Fe3+ ions in an aqueous medium and their adsorption on internal and external surfaces, with the use of a Fe-EDTA complex. Magnetite polycrystalline nanowires were characterized by means of X-ray diffraction and 57Fe Mössbauer spectroscopy (MS). The average length of these nanowires is about 70 nm and their diameter is about 3 nm. Mössbauer studies evidenced that the composites consist of very small Fe3O4 particles. Almost 80% of particles exist in a paramagnetic state.
    Źródło:
    Nukleonika; 2007, 52, supl. 1; 33-36
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some Comments on p-Ps and Density Parameter
    Autorzy:
    Goworek, T.
    Wawryszczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933488.pdf
    Data publikacji:
    1995-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.10.Dr
    Opis:
    The constraint-free analysis of several representative positron lifetime spectra was performed with the resolution time of 144 ps. The role of p-Ps parameters in understanding of the positronium structure in solids is discussed.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 1; 135-138
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positronium Formation in Solid Long-Chain Alkanes
    Autorzy:
    Zaleski, R.
    Wawryszczuk, J.
    Goworek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042188.pdf
    Data publikacji:
    2005-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.10.Dr
    78.70.Bj
    Opis:
    This paper represents a fragment of systematic studies on positron annihilation in solid saturated hydrocarbons (alkanes, paraffins) from C$\text{}_{17}$H$\text{}_{36}$ to C$\text{}_{30}$H$\text{}_{62}$. The Tao-Eldrup model and its extensions allow to identify the places in the crystalline structure where positronium is trapped, and estimate respective trap sizes. In the rigid phase I positronium locates mainly in two-dimensional empty spaces between the lamellae of crystal structure. Additional free volumes exist in high temperature phases due to appearance of n-alkane conformers representing a non-planar molecule distortion. The rise of ortho-positronium intensity with the sample irradiation dose, which was seen earlier in polymers, is observed also in n-alkanes. One can find similarities between the ortho-positronium annihilation in crystalline alkanes and polymers, like exponential character of that rise, and the trap bleaching by illumination. It confirms the same origin of the intensity growth, i.e. the accumulation of trapped electrons. Two kinds of electron traps were found. The time constant of electron accumulation in the traps depends on the carbon chain length and varies with temperature in different way for even- and odd-numbered alkanes.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 4; 635-641
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pressure Effects in ortho-Positronium Annihilation
    Autorzy:
    Goworek, T.
    Wawryszczuk, J.
    Zaleski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042179.pdf
    Data publikacji:
    2005-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.10.Dr
    78.70.Bj
    Opis:
    A short review of experiments concerning the influence of high pressure on positron annihilation in molecular solids is given. To this kind of experiments belong e.g. pressure inhibition of positronium formation, pressure induced phase transitions, and free volume swelling in the media intercalated by high pressure gas.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 4; 608-614
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positrons in naphthalene : critical remarks on the relation between o-Ps lifetime and void size
    Autorzy:
    Goworek, T.
    Zgardzińska, B.
    Wawryszczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148003.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    high pressure
    naphthalene
    positronium quenching
    free volume
    Opis:
    Lowering the temperature or applying high pressure leads to elimination of positronium component in the e+ lifetime spectrum in solid naphthalene. Disappearance of positronium means reaching the free volume size limit at which there is no energy level in the potential well. It allows to estimate that size, which is found inconsistent with predictions of the popular Tao-Eldrup model. The range of applicability of that model is discussed. The dependence of the free e+ decay constant on pressure indicates that positronium is formed not only in the blob processes, but during the whole free positron life. The lifetime of free positrons begins to rise with temperature earlier than Ps intensity.
    Źródło:
    Nukleonika; 2013, 58, 1; 183-187
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distortion of the Positron Lifetime Spectra in BaF$\text{}_{2}$ Spectrometers
    Autorzy:
    Goworek, T.
    Górniak, W.
    Wawryszczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1858021.pdf
    Data publikacji:
    1993-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.50.Dc
    07.85.+n
    Opis:
    High efficiency of BaF$\text{}_{2}$ scintillators creates the risk of distortion of the positron lifetime distributions due to summing and backscattering. In the 180° geometry it leads to the appearance of a spurious shortlived component.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 3; 307-311
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ortho-Positronium in Some n-Alkanes; Influence of Temperature and Pressure
    Autorzy:
    Zgardzińska, B.
    Pietrow, M.
    Goworek, T.
    Wawryszczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047166.pdf
    Data publikacji:
    2006-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.10.Dr
    61.80.Fe
    71.60.+z
    78.70.Bj
    Opis:
    Positron lifetime spectra were measured for a series of odd-numbered n-alkanes from C$\text{}_{11}$H$\text{}_{24}$ to C$\text{}_{19}$H$\text{}_{40}$ as a function of temperature and pressure. The ortho-Ps lifetimes in the rotator phase and the increase in intensity at the transition to that phase can be explained by location of Ps in the vicinity of kink-type conformers. The relation between o-Ps lifetime and molecule length can be described in the framework of extended Tao-Eldrup model. One can eliminate the effect of intensity rise in time by sample illumination or by application of high pressure. A decrease in temperature by 1 K is equivalent to an increase in pressure by about 4 MPa.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 5; 747-753
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Website control system of the human body insulin level
    Autorzy:
    Doniec, R.
    Doniec, K.
    Doniec-Wolnik, J.
    Goworek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/333493.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    stężenie glukozy
    telemedycyna
    sztuczne organy
    glucose concentration
    telemedicine
    artificial organs
    Opis:
    The following research characterizes the system for remote data collection of blood glucose concentration. Based on the data an algorithm was introduced in order to determine the infusion of insulin. This paper presents a glucose measurement method using the test strips, instructions for collecting the source data, as well as the process of adjusting the insulin dosage.
    Źródło:
    Journal of Medical Informatics & Technologies; 2008, 12; 103-108
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Attempt to Produce the Implanted $\text{}^{22}$Na Source for Positron Spectrometry
    Autorzy:
    Latuszyński, A.
    Yushkevich, Yu. V.
    Bystrov, V. A.
    Misak, R.
    Wawryszczuk, J.
    Goworek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929102.pdf
    Data publikacji:
    1993-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    28.60.+s
    29.25.Rm
    Opis:
    Preliminary results of $\text{}^{22}$Na implantation into the metal foils in order to produce the positron source for annihilation experiments are presented.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 3; 345-348
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Temperature and Pressure Dependence of the Free Volume in Fluoroelastomers from PALS and PVT Experiments
    Autorzy:
    Dlubek, G.
    Sen Gupta, A.
    Wawryszczuk, J.
    Kilburn, D.
    Pionteck, J.
    Krause-Rehberg, R.
    Goworek, T.
    Alam, M. A.
    Kaspar, H.
    Lochhaas, K. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042202.pdf
    Data publikacji:
    2005-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.41.+e
    78.70.-g
    Opis:
    Positron lifetime and pressure-volume-temperature experiments were performed as function of T (100-485 K) and P (10$\text{}^{-5}$ Pa-500 MPa) on a fluoroelastomer. From positron annihilation lifetime spectroscopy, analyzed with LT9.0 assuming a dispersion in the e$\text{}^{+}$ (τ$\text{}_{2}$) and o-Ps (τ$\text{}_{3}$) lifetime, the mean, 〈v$\text{}_{h}$〉, and the width (standard deviation), σ$\text{}_{h}$, of the hole size distribution were calculated. The pressure-volume-temperature data were analyzed using the Simha-Somcynsky hole-lattice theory to estimate the specific hole free volume V$\text{}_{f}$. From a comparison of V$\text{}_{f}$ with 〈v$\text{}_{h}$〉 the specific hole number, N'$\text{}_{h}$, is estimated. The data from thermal expansion and pressure experiments show complete agreement when taking into account the compressibility of the occupied volume.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 4; 685-689
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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