Skocz do pozycji: 1.

Tytuł:

FT-IR, Thermal and NLO Studies on Amino Acid (L-Arginine and L-Alanine) Doped KDP Crystals

Autorzy:

Muley, G.
Rode, M.
Pawar, B.

Powiązania:

https://bibliotekanauki.pl/articles/1585044.pdf

Data publikacji:

2009-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.66.Hq

Opis:

Single crystals of pure and amino acid (L-arginine and L-alanine) doped potassium dihydrogen phosphate (KDP) for second harmonic generation have been grown from low temperature solution growth method by employing slow evaporation of the solvent. FT-IR spectrum of pure and doped KDP crystals confirms qualitatively the doping of the L-arginine and L-alanine in the host crystals. UV-visible spectroscopy shows the improvement in the transparency. Crystal structure has been studied by powder X-ray diffraction. Modification in the lattice parameters has been observed. Improvement in the SHG efficiency was studied by the Kurtz and Perry method. Thermal analysis has been performed on the grown crystals.

Źródło:

Acta Physica Polonica A; 2009, 116, 6; 1033-1038
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Energy Transfer to Trace Impurities in Cs$\text{}_{2}$NaY$\text{}_{1-x}$Pr$\text{}_{x}$Cl$\text{}_{6}$: Consequences for Interpretation of Emission Decay Curves

Autorzy:

Vasquez, S. O.
Flint, C. D.

Powiązania:

https://bibliotekanauki.pl/articles/1945620.pdf

Data publikacji:

1996-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

13.40.Hq
31.70.Hq
61.72.Ss
78.55.Hx

Opis:

We report the $\text{}^{3}$P$\text{}_{0}$ → $\text{}^{3}$H$\text{}_{4}$ and $\text{}^{3}$P$\text{}_{0}$ → $\text{}^{3}$H$\text{}_{4}$ luminescence decay curves of Cs$\text{}_{2}$NaY$\text{}_{1-x}$Pr$\text{}_{x}$Cl$\text{}_{6}$ at 20 K as a function of excitation wave number in the region of the transitions to the $\text{}^{3}$P$\text{}_{0}$ state near 20602 cm$\text{}^{-1}$, the $\text{}^{3}$P$\text{}_{1}$ state near 21200 cm$\text{}^{-1}$ and the six components of the $\text{}^{1}$I$\text{}_{6}$ state distributed over the region 21164 to about 22000 cm$\text{}^{-1}$. For x = 0.001 and excitation into the absorption maxima, the decay curves are independent of excitation wave number and of the emission transition monitored, and are exactly exponential. Excitation at regions of weak absorption between the main absorption bands produces markedly different decay curves characterised by a prominent very fast relaxation at short times and a long exponential tail. The fast decay is strongly non-exponential. On increasing the temperature, this fast process becomes less prominent, and it is not detectable in the 298 K curves. For x>=0.05 the fast process is not present at any temperature. We propose that this fast process is due to emission from PrCl$\text{}_{6}^{3-}$ ions perturbed by a nearby water molecule.

Źródło:

Acta Physica Polonica A; 1996, 90, 2; 315-322
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Energy Transfer and Up-Conversion in the Erbium Elpasolites Cs$\text{}_{2}$NaEr$\text{}_{x}$Y$\text{}_{1-x}$Cl$\text{}_{6}$

Autorzy:

Campbell, M.
Flint, C. D.

Powiązania:

https://bibliotekanauki.pl/articles/1945497.pdf

Data publikacji:

1996-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

13.40.Hq
31.70.Hq
34.30.+h
61.72.Ss
78.55.Hx

Opis:

The luminescence decay curves from the $\text{}^{4}$F $\text{}_{9}\text{}_{/}\text{}_{2}$ and $\text{}^{4}$I $\text{}_{9}\text{}_{/}\text{}_{2}$ states of the cubic hexachloroelpasolite crystals Cs$\text{}_{2}$NaEr$\text{}_{x}$Y$\text{}_{1-x}$Cl$\text{}_{6}$ (x = 0.001÷1) have been measured over the temperature range 10-300 K. The $\text{}^{4}$I $\text{}_{9}\text{}_{/}\text{}_{2}$ state undergoes an electric dipole vibronic-electric dipole vibronic cross-relaxation process at 300 K, but this mechanism is inefficient below 165 K. Excitation into the $\text{}^{4}$F $\text{}_{9}\text{}_{/}\text{}_{2}$ state, results in emission in the green, blue and ultra violet regions. The up-conversion processes which could account for the ultraviolet emission are discussed.

Źródło:

Acta Physica Polonica A; 1996, 90, 1; 151-160
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Monte Carlo Study of Chain Entanglements in Polymer MeltDOI

Autorzy:

Sikorski, A.
Romiszowski, P.

Powiązania:

https://bibliotekanauki.pl/articles/2028878.pdf

Data publikacji:

2001-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.50.Ng
61.25.Hq

Opis:

The new multibond algorithm for the Monte Carlo simulations of polymers developed for an isolated chain was extended for the case of dense polymer melts. Polymer chains were confined to a simple cubic lattice with excluded volume and no attractive interactions (good solvent conditions). The simulations were carried out by the means of the classical Metropolis scheme. The algorithm was verified by the analysis of static and dynamic properties of polymer melts. The dependence of the longest relaxation time and the self-diffusion coefficient on the chain length and the polymer concentration was discussed and the proper scaling laws were formulated. The number of entanglements, their distribution, and lifetimes were determined for different chain lengths and melt concentrations using the new algorithm.

Źródło:

Acta Physica Polonica A; 2001, 100, 4; 477-484
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Photophysical Properties of Diphenylacetylene and Diphenylbutadiyne Derivatives in Solution Phase

Autorzy:

Hirata, Y.
Okada, T.
Nomoto, T.

Powiązania:

https://bibliotekanauki.pl/articles/1992658.pdf

Data publikacji:

1998-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

31.70.Hq
78.47.+p

Opis:

By using the femtosecond and picosecond transient absorption measurement techniques, we have investigated diphenylacetylene, diphenylbutadiyne, and their methoxy and cyano derivatives in the solution phase. Both the rapid S$\text{}_{2}$ → S$\text{}_{1}$ internal conversion in the subpicosecond time scale and the triplet formation in the tens of picosecond region were observed for diphenylbutadiyne and its methoxy derivatives, while the dynamic behavior of dimethoxy-diphenylacetylene was quite similar to that of diphenyl acetylene. The level inversion of the lowest excited singlet states of dicyano-diphenylbutadiyne was observed. The thermally activated S$\text{}_{2}$ ← S$\text{}_{1}$ internal conversion was not negligible and the sum of the rate constants of S$\text{}_{2}$ → S$\text{}_{1}$ and S$\text{}_{2}$ ← S$\text{}_{1}$ internal conversions was estimated to be about 5 × 10$\text{}^{11}$ s$\text{}^{-1}$ at room temperature.

Źródło:

Acta Physica Polonica A; 1998, 94, 4; 627-636
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

New Multi-Bond Algorithm for Monte Carlo Simulation of Lattice Chains

Autorzy:

Romiszowski, P.
Sikorski, A.

Powiązania:

https://bibliotekanauki.pl/articles/2011150.pdf

Data publikacji:

1999-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.50.Ng
61.25.Hq

Opis:

The new algorithm for the Monte Carlo simulations of polymer lattice chains was developed. The model chains were constructed on a simple cubic lattice. The simulations were carried out on chains with and without excluded volume effect using the Metropolis scheme. The basic concept of the new algorithm is the multi-bond modification of the chain conformation instead of applying the classical set of elementary micromodifications. The correctness of the algorithm was verified by studying both static and dynamic properties of the chains. The new algorithm was found to be 3 to 8 times faster than the classical one.

Źródło:

Acta Physica Polonica A; 1999, 96, 6; 691-697
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Effect of pH on Paramagnetic Centers in Cladosporium cladosporioides Melanin

Autorzy:

Pilawa, B.
Buszman, E.
Gondzik, A.
Wilczyński, S.
Zdybel, M.
Witoszyńska, T.
Wilczok, T.

Powiązania:

https://bibliotekanauki.pl/articles/2043413.pdf

Data publikacji:

2005-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.66.Hq
76.30.Rn

Opis:

Paramagnetic centers in melanin existing in pigmented soil fungi Cladosporium cladosporioides cultured at acidic (4, 5, 6), neutral (7), and alkaline (8) pH were studied by EPR method. o-semiquinone free radicals (g: 2.0032-2.0040) concentration in melanin biopolymer increased for pH from 4 to 6, decreased at pH 7, and reached the maximum value at pH 8. It may be expected that melanin free radicals reactions with small molecules (metal ions, drugs) are the most effective at pH between 6 and 8. Slow spin-lattice relaxation processes exist in the all studied melanin samples.

Źródło:

Acta Physica Polonica A; 2005, 108, 1; 147-150
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Paramagnetic Centers in DOPA-Melanin-Dihydrostreptomycin Complexes

Autorzy:

Buszman, E.
Pilawa, B.
Zdybel, M.
Wrześniok, D.
Grzegorczyk, A.
Wilczok, T.

Powiązania:

https://bibliotekanauki.pl/articles/2043624.pdf

Data publikacji:

2005-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.66.Hq
76.30.Rn

Opis:

DOPA-melanin-dihydrostreptomycin complexes with drug concentrations 1×10$\text{}^{-4}$-1×10$\text{}^{-2}$ M were examined by the use of electron paramagnetic resonance spectroscopy at X-band (9.3 GHz). Dihydrostreptomycin was chosen for studies, because this aminoglycoside antibiotic causes strong toxic effects in organism. It was stated that dihydrostreptomycin generates o-semiquinone free radicals with g=2.0038 in melanin. Free radicals formation increases with increase in the antibiotic concentration. Changes of EPR lines with microwave powers pointed out that slow spin-lattice relaxation processes exist in DOPA-melanin and in its complexes with dihydrostreptomycin. The measured EPR lines were homogeneously broadened.

Źródło:

Acta Physica Polonica A; 2005, 108, 2; 353-356
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Multi-Component EPR Spectra of Coals with Different Carbon Content

Autorzy:

Pilawa, B.
Więckowski, A. B.
Pietrzak, R.
Wachowska, H.

Powiązania:

https://bibliotekanauki.pl/articles/2043651.pdf

Data publikacji:

2005-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.66.Hq
76.30.Rn

Opis:

EPR spectra of lignite"Mequinenza" (Spain) (62.3 wt% C) and Polish orthocoking coal (87.8 wt% C) were compared. The spectra were superpositions of broad Gaussian, broad Lorentzian 1, and narrow Lorentzian 3 lines. Concentration of paramagnetic centers - mainly delocalizedπ electrons - responsible for narrow Lorentzian 3 lines increases with increase in carbon content in coal. Coal units with slow and fast spin-lattice relaxation processes exist in the two studied samples. Slow spin-lattice interactions occur in simple aromatic coal units with broad Gaussian and Lorentzian 1 lines. Fast spin-lattice relaxation processes are characteristic of large aromatic units with narrow Lorentzian 3 lines.

Źródło:

Acta Physica Polonica A; 2005, 108, 2; 403-407
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 10.

Tytuł:

Effect of Laser Radiation on Free Radicals in Human Cancer G361 Cells

Autorzy:

Latocha, M.
Pilawa, B.
Zdybel, M.
Wilczok, T.

Powiązania:

https://bibliotekanauki.pl/articles/2043652.pdf

Data publikacji:

2005-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.77.Hq
76.30.Rn

Opis:

EPR spectroscopy was used to the examination of free radicals evolution in cancer G361 cells during photodynamic therapy. The cancer cells were cultured with photosensitizer ALA and irradiated with 635 nm light by laser. The number of cells was determined microscopically. The decrease in the cell number and the increase in free radicals, obtained for G361 cells cultured with ALA and irradiated with laser, were stronger than relevant changes for the cells which were only irradiated with laser. The studied melanotic cells susceptible for photodynamic therapy differ from the other melanotic SK human cancer cells by fast spin-lattice relaxation processes. Slow spin-lattice relaxation processes exist in the studied earlier non susceptible for photodynamic therapy SK cells.

Źródło:

Acta Physica Polonica A; 2005, 108, 2; 409-412
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 11.

Tytuł:

Transmission matrix and Faraday rotation in a structure composed of over-dense magnetized plasma, dielectric, and prism layers

Autorzy:

Nejati, M.
Rajaei, L.

Powiązania:

https://bibliotekanauki.pl/articles/1058194.pdf

Data publikacji:

2016-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

52.25.Xz
52.59.Hq

Opis:

In this study, the anomalous transmission of wave through over-dense magnetized plasma is investigated. Electromagnetic waves propagate in over-dense matter through an excitation of the surface waves. For excitation of the surface waves, the structure of the prism, dielectric and magnetized over-dense plasma are considered. Variations in the transmitted and reflected amplitudes with the incident angle θ is investigated. Moreover, the effect of the thicknesses of the dielectric and plasma layers and that of the plasma and cyclotron frequencies on the transmitted wave amplitude are studied. In addition, the Faraday rotation of the transmitted and reflected waves as functions of the incident angle is investigated. The effect of various parameters on the Faraday rotation is considered. The prism currently deployed in this structure decreases the restriction of dielectric constant and provides conditions for actual construction.

Źródło:

Acta Physica Polonica A; 2016, 130, 6; 1346-1351
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Simulation of Radiation Effects in SiO₂/Si Structures

Autorzy:

Komarov, F.
Zayats, G.
Komarov, A.
Miskiewicz, S.
Michailov, V.
Komsta, H.

Powiązania:

https://bibliotekanauki.pl/articles/1402212.pdf

Data publikacji:

2015-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.30.Hq
02.60.Cb

Opis:

The space-time evolution of electric charge induced in the dielectric layer of simulated metal-insulator-semiconductor structures due to irradiation with X-rays is discussed. The system of equations used as a basis for the simulation model is solved iteratively by the efficient numerical method. The obtained simulation results correlate well with the respective data presented in other scientific publications.

Źródło:

Acta Physica Polonica A; 2015, 128, 5; 857-860
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

The Geometry of the Excited Charge Transfer States: Flattening or Twisting?

Autorzy:

Dobkowski, J.
Sazanovich, I.

Powiązania:

https://bibliotekanauki.pl/articles/1813988.pdf

Data publikacji:

2007-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

33.50.-j
61.66.Hq

Opis:

Numerous molecules built of an electron acceptor and electron donor units linked together by single bond exhibit a peculiar behavior in their low-lying electronically excited states. N,N-diethylaminoacetophenone and 4-acetyl-4'-dimethylamino-biphenyl, having acetophenone as the acceptor and differentiated by the donors groups $N(CH_3)_2$ and dimethylaniline, respectively, were selected as the subject of study. To recognize the excited state relaxation paths the stationary and time-resolved spectroscopy in absorption and emission was applied. Experimental results indicate that after excitation in polar solvents N,N-diethylaminoacetophenone reduces to minimum the overlap between π-electron systems of the donor and acceptor groups relaxing to the twisted internal charge-transfer state; contrary to that, flattening of the 4-acetyl-4'-dimethylamino-biphenyl skeleton generates increase in the overlap of the π-electron systems.

Źródło:

Acta Physica Polonica A; 2007, 112, S; S-127-S-142
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 14.

Tytuł:

EPR Studies of Carbonized Cellulose - Oxygen Interactions

Autorzy:

Pilawa, B.
Pietrzak, R.
Wachowska, H.
Babeł, K.

Powiązania:

https://bibliotekanauki.pl/articles/2043418.pdf

Data publikacji:

2005-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.66.Hq
76.30.Rn

Opis:

EPR examination of cellulose carbonized at 400ºC and 600ºC has been performed. The aim of this work was to search a sample useful as the oximetric probe in biology and medicine. The higher paramagnetic centers concentration characterizes cellulose carbonized at 600ºC, which was found as the sensitive oximetric probe. Quasi-chemical bonds between cellulose molecules and paramagnetic O$\text{}_{2}$ molecules decrease paramagnetic centers concentration. A linear increase in paramagnetic centers concentration and a linear decrease in EPR linewidth with increasing time of sample evacuation were observed for cellulose carbonized at 600ºC. Oxygen affects spin-lattice interactions in carbonized cellulose.

Źródło:

Acta Physica Polonica A; 2005, 108, 1; 151-154
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Laguerre polynomial solutions of a class of initial and boundary value problems arising in science and engineering fields

Autorzy:

Gürbüz, B.
Sezer, M.

Powiązania:

https://bibliotekanauki.pl/articles/1061583.pdf

Data publikacji:

2016-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.30.Gp
02.30.Hq
02.70

Opis:

In this study, we consider high-order nonlinear ordinary differential equations with the initial and boundary conditions. These kinds of differential equations are essential tools for modelling problems in physics, biology, neurology, engineering, ecology, economy, astrophysics, physiology and so forth. Each of the mentioned problems are described by one of the following equations with the specific physical conditions: Riccati, Duffing, Emden-Fowler, Lane Emden type equations. We seek the approximate solution of these special differential equations by means of a operational matrix technique, called the Laguerre collocation method. The proposed method is based on the Laguerre series expansion and the collocation points. By using the method, the mentioned special differential equations together with conditions are transformed into a matrix form which corresponds to a system of nonlinear algebraic equations with unknown Laguerre coefficients, and thereby the problem is approximately solved in terms of Laguerre polynomials. In addition, some numerical examples are presented to demonstrate the efficiency of the proposed method and the obtained results are compared with the existing results in literature.

Źródło:

Acta Physica Polonica A; 2016, 130, 1; 194-197
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 16.

Tytuł:

Stabilized 1D Metal in TTF(Ni(dmit)$\text{}_{2}$)$\text{}_{2}$ through Very Weak Coupling between Phonons and Weakly Correlated Fermions

Autorzy:

Doublet, M. L.
Malfant, I.
Hebrard, S.
Canadell, E.
Gaultier, J.
Chasseau, D.
Legros, J. P.
Brossard, L.

Powiązania:

https://bibliotekanauki.pl/articles/1933351.pdf

Data publikacji:

1995-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.20.Hk
71.45.Lr
61.66.Hq

Opis:

Extended Hückel band structure calculations derived from low temperature X-ray structural data, provide evidence, as temperature decreases, for an increasing 1D character of the multiparallel bands of the TTF(Ni(dmit)$\text{}_{2}$)$\text{}_{2}$ compound. This result is discussed within the monotonous metallic behaviour of the weakly correlated fermions gas, despite condensations of charge density wave instabilities.

Źródło:

Acta Physica Polonica A; 1995, 87, 4-5; 781-784
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Response of Superconductor Bolometer to Phonon Fluxes

Autorzy:

Danilchenko, B. A.
Jasiukiewicz, Cz.
Paszkiewicz, T.
Wolski, S.

Powiązania:

https://bibliotekanauki.pl/articles/2035733.pdf

Data publikacji:

2003-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

07.57.Kp
02.30.Hq
66.70.+f

Opis:

A metallic film bolometer with heat capacity C is in contact with thermal bath and with crystalline specimen and is biased by a constant current I$\text{}_{b}$. The thermal contact of the bolometer is characterized by the thermal conductance G. The bolometer operates in the linear regime of dependence of resistance on temperature characterized by a constantα. Experiments which allow one to measureα, C, and G are proposed. The characteristic timeτ=C/G and characteristic current I$\text{}_{m}=\sqrt{\text{G/α}}$ affect the effective relaxation rateΛ of the bolometer resistance R$\text{}_{b}$(t). The knowledge of the power W(t) absorbed by detector allows one to calculate R$\text{}_{b}$(t). The inverse problem of calculation of W(t) from known R$\text{}_{b}$(t) is also solved. The suitable algorithms are proposed. Deconvoluted absorbed power is obtained for experiments performed on GaAs and compared with phonoconductivity signal of two-dimensional electron gas structure as well as with results of Monte Carlo computer experiments.

Źródło:

Acta Physica Polonica A; 2003, 103, 4; 325-338
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

The Shape of Confined Polymer Chains

Autorzy:

Sikorski, A.

Powiązania:

https://bibliotekanauki.pl/articles/2035734.pdf

Data publikacji:

2003-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.50.Ng
05.10.Ln
61.25.Hq

Opis:

The linear polymer chains were modeled on a simple cubic lattice. The excluded volume was included into the model while the system remained athermal (no attractive interactions) which simulated the good solvent conditions. The polymer chain was located between two parallel impenetrable walls and the distance between the walls was changing. No interaction between walls and polymer segments was assumed. These models of polymer chains were simulated by the means of the Monte Carlo method. In the sampling algorithm we used the micromodifications of chain's conformations to sample efficiently the conformational space. The size of the chain did not change monotonically for all lengths under consideration (up to 800 statistical segments). For distances between the plates close to the double value of chain's radius of gyration the size of the chain approached its minimum value. It was shown that scaling of chain dimensions with its length changed from N$\text{}^{1.18}$ to N$\text{}^{1.5}$ while the distance between the walls was decreasing. The behavior of the asymmetry of the chain was found to be analogous to that of the radius of gyration.zapisz i p

Źródło:

Acta Physica Polonica A; 2003, 103, 4; 339-347
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Time Differential Perturbed Angular γγ-Correlation Studies of Diethylenetriaminepentaacetic Acid Complexes with $\text{}^{111}$In and $\text{}^{111m}$Cd

Autorzy:

Shpinkova, L. G.
Carbonari, A. W.
Nikitin, S. M.
Mestnik-Filho, J.

Powiązania:

https://bibliotekanauki.pl/articles/2029030.pdf

Data publikacji:

2001-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

23.20.En
23.40.-s
61.66.Hq

Opis:

Static and dynamic electric quadrupole interactions of $\text{}^{111}$Cd in complexes with diethylenetriaminepentaacetic acid were studied by the time differential perturbed angular γγ-correlation technique using two parent isotopes, $\text{}^{111}$In(EC)$\text{}^{111}$Cd and $\text{}^{111 m}$Cd. The measurements were carried out using neutral aqueous solutions of the diethylenetriaminepentaacetic- acid-complexes with initial isotopes at 293 K and 77 K. It was shown that the $\text{}^{111}$Cd-diethylenetriaminepentaacetic-acid-complex in aqueous solutions at pH = 7.0 is characterised by the re-orientational correlation time of 7.7×10$\text{}^{-11}$ s and an electric field gradient V$\text{}_{zz}$=6.7(2)×10$\text{}^{21}$ V/m$\text{}^{2}$ with an asymmetry parameter η=0.75(5). A direct comparison of the electric quadrupole interaction parameters for diethylenetriaminepentaacetic- acid-complexes with $\text{}^{111}$In and $\text{}^{111m}$Cd confirmed the proposal about the fragmentation of the complexes caused by the after-effects of electron capture in $\text{}^{111}$In. An observed difference in the electric quadrupole interaction parameters obtained for the solutions with $\text{}^{111}$In and $\text{}^{111m}$Cd complexes reflects a process of a chemical rearrangement of the complex structure after the In decay into Cd

Źródło:

Acta Physica Polonica A; 2001, 100, 5; 799-805
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Photoinduced Charge Separation Processes in Supramolecular Triad Systems

Autorzy:

Pirowska, K.
Najbar, J.

Powiązania:

https://bibliotekanauki.pl/articles/1992700.pdf

Data publikacji:

1998-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

31.70.Hq
82.30.Fi
87.15.Rn

Opis:

The nonadiabatic electron transfers in donor-acceptor-acceptor systems are investigated using three potential energy surfaces and two reaction coordinates via the stochastic Liouville equation to describe time evolution of the three excited electronic states: (1) D*-A-A, (2) D$\text{}^{+}$-A$\text{}^{-}$-A and (3) D$\text{}^{+}$-A-A$\text{}^{-}$. The electronic dephasing processes are taken into account phenomenologically in terms of dephasing constants. The couplings between surfaces are effective along the intersections of pairs of surfaces in the two-dimensional coordinate space. Special situations occur in the reaction coordinate space when three surfaces are nearly degenerate. The interplay between the sequential electron transfer processes and the superexchange process is analysed for different: reorganization energies, electronic coupling, free energies for the electron transfer, dephasing rates, and temperature. The time dependent contribution of the superexchange process to the charge separation in the triad system is analysed using the time dependent rate functions. It is shown that in the nonadiabatic limit of electron transfer the influence of the electronic dephasing processes for low barrier reactions can be accounted for by appropriate changes in the reorganization energies. The present model is compared with the experimental results concerning the charge separation in the bacterial photosynthetic reaction centers.

Źródło:

Acta Physica Polonica A; 1998, 94, 4; 637-654
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Thermal Development of Free Volumes in Nafion Membrane

Autorzy:

Melikhova, O.
Čížek, J.
Košinová, L.
Hruška, P.

Powiązania:

https://bibliotekanauki.pl/articles/1033913.pdf

Data publikacji:

2017-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.70.Bj
61.66.Hq
82.35.Lr

Opis:

In this work we employed positron lifetime spectroscopy for investigation of the thermal development of free volumes in H⁺ Nafion membrane over a broad range of temperatures from -150 to 150°C. Positron lifetime studies were combined with differential scanning calorimetry. Size distribution of free volumes was determined from ortho-positronium contribution to positron lifetime spectra. Our investigations revealed that the mean size of free volume holes strongly increases with temperature. On the other hand, the width of the size distribution and the positronium yield decreases with temperature. Transition temperatures corresponding to a change in the slope of the temperature dependence of ortho-positronium lifetime were identified. Results of positron lifetime spectroscopy agree well with the curve obtained by differential scanning calorimetry.

Źródło:

Acta Physica Polonica A; 2017, 132, 5; 1538-1542
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Casimir Force between Nanoparticles Immersed in a Crosslinked Polymer Blend

Autorzy:

El Fassi, S.
Benhamou, M.
Boughou, M.
Kaidi, H.
El Yaznasni, M.
Ridouane, H.

Powiązania:

https://bibliotekanauki.pl/articles/1535673.pdf

Data publikacji:

2010-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.25.Hq
64.75.+g
82.70.Gg

Opis:

We consider a crosslinked polymer blend made of two polymers of different chemical nature. We suppose that such a system incorporates small colloidal particles, which prefer to be attracted by one polymer, close to the spinodal temperature. This is the so-called critical adsorption. As assumption, the particle diameter, $d_0$, is considered to be small enough in comparison with the size of microdomains (mesh size) ξ* ~ $an^{1//2}$, with a - the monomer size and n - the number of monomers between consecutive crosslinks. The critical fluctuations of the crosslinked polymer mixture induce a pair-potential between particles located in the non-preferred phase. The purpose is the determination of the Casimir pair-potential, $U_2 (r)$, as a function of the interparticle distance r. To achieve calculations, use is made of an extended de Gennes field theory that takes into account the colloid-polymer interactions. Within the framework of this theory, we first show that the pair-particle is attractive. Second, we find for this potential the exact form: $U_2(r)//k_{B}T = - A_{H}(d_0//r)^2 exp(-r//ξ*) - B_{H}(d_0//r)^4 exp(-2r//ξ*)$, with the known universal amplitudes $A_{H}$ > 0 and $B_{H}$ > 0 (the Hamaker constants). This expression clearly shows that the pair-potential differs from its homologue with no crosslinks only by the two exponential factors exp(-r/ξ*) and exp(-2r/ξ*). The main conclusion is that the presence of reticulations reduces substantially the Casimir effect in crosslinked polymer blends.

Źródło:

Acta Physica Polonica A; 2010, 118, 4; 606-612
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

EPR Evidence for Thermally Excited Triplet States in Exinite, Vitrinite and Inertinite Separated from Bituminous Coal

Autorzy:

Słowik, G. P.
Wojtowicz, W.
Więckowski, A. B.

Powiązania:

https://bibliotekanauki.pl/articles/2043436.pdf

Data publikacji:

2005-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.66.Hq
76.30.Rn
87.64.Hd

Opis:

In this work we have made an electron spin resonance (EPR) study of macerals obtained from the lithotype clarain separated from Polish medium-rank coal (85.6 wt.% C). For three macerals:~exinite, vitrinite, and inertinite, the temperature dependence of intensity of EPR spectra in the temperature range of 100-373 K was investigated. The experimentally obtained EPR spectra of macerals were fitted by curves of the derivatives of the Gaussian and Lorentzian functions. The best fitting was obtained, when the experimental EPR spectra were assumed to be a superposition of three lines, for exinite and vitrinite - a broad Gaussian (G), a broad Lorentzian (L1) and a narrow Lorentzian (L3) line, but for inertinite of two lines - a narrow Lorentzian (L2) and a narrow Lorentzian (L3) line. The computer-assisted fitting has shown that each individual component line has similar values of resonance field, but different linewidths and amplitudes. The temperature dependence of line intensity I of the broad Gaussian (G) and narrow Lorentzian (L2 and L3) lines fulfils the Curie law in the form I=C/T or IT=C, whereas the broad Lorentzian (L1) line does not fulfil the Curie law. In the last case the temperature dependence of the Lorentzian (L1) component was fitted by the relation I=C/T+B/[T(3+exp(J/kT))] or IT=C+B/[3+exp(J/kT))], valid for thermally excited triplet states (S=1). For exinite and vitrinite the curves presenting the temperature dependence of the product IT versus temperature T were resolved into two curves, one for paramagnetic centres in the doublet state (S=1/2), and the other for paramagnetic centres in the thermally excited triplet state (S=1).

Źródło:

Acta Physica Polonica A; 2005, 108, 1; 171-176
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Structure of Dense Polymer Systems Confined to a Slit

Autorzy:

Sikorski, A

Powiązania:

https://bibliotekanauki.pl/articles/2044630.pdf

Data publikacji:

2006-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.50.Ng
05.10.Ln
61.25.Hq

Opis:

The linear polymer chains were approximated as series of identical segments on a simple cubic lattice. The excluded volume was included into the model with no attractive interactions which corresponded to the good solvent conditions. The polymer chains were put into a slit formed by a pair of parallel surfaces. These walls were impenetrable for polymer segments and no other interactions between walls and chains were assumed. The models chains were studied by the means of the Monte Carlo method. The sampling algorithm was Metropolis-type and employing micromodifications of chain's conformation to sample efficiently the conformational space. The influence of the chain length, density of the polymer system, and the distance between the surfaces on the shape of macromolecules was studied. It was found that the decrease in the size of the slit and the decrease in the polymer density led to the formation of more spherical macromolecules. This is partially caused by the interpenetration of polymer chains.

Źródło:

Acta Physica Polonica A; 2006, 109, 2; 133-141
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Solution of a Class of Optimization Problems Based on Hyperbolic Penalty Dynamic Framework

Autorzy:

Evirgen, F.

Powiązania:

https://bibliotekanauki.pl/articles/1031640.pdf

Data publikacji:

2017-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.60.Pn
02.70.-c
02.30.Hq

Opis:

In this study, a gradient-based dynamic system is constructed in order to solve a certain class of optimization problems. For this purpose, the hyperbolic penalty function is used. Firstly, the constrained optimization problem is replaced with an equivalent unconstrained optimization problem via the hyperbolic penalty function. Thereafter, the nonlinear dynamic model is defined by using the derivative of the unconstrained optimization problem with respect to decision variables. To solve the resulting differential system, a steepest descent search technique is used. Finally, some numerical examples are presented for illustrating the performance of the nonlinear hyperbolic penalty dynamic system.

Źródło:

Acta Physica Polonica A; 2017, 132, 3; 1062-1065
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Investigations of Resorcinol under High Pressure

Autorzy:

Tydda, M.
Jasińska, B.

Powiązania:

https://bibliotekanauki.pl/articles/1196480.pdf

Data publikacji:

2014-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.70.Bj
36.10.Dr
61.66.Hq

Opis:

The investigation of intermolecular free volumes in resorcinol was conducted under high pressure, hydraulic pressure and gas (argon or nitrogen) atmosphere. The sizes of free volumes were estimated basing on the mean lifetime of ortho-positronium (o-Ps). In the first case, a monotonous change of lifetime and intensity was observed for the o-Ps component while the range of pressure was 0-477 MPa. On the other case, the samples were put into the pressure chamber filled with argon or nitrogen in the range of pressure from 0 to 450 MPa. When the pressure chamber was filled with a gas, the appearance of an additional o-Ps component has been found. In the nitrogen atmosphere, the material crushed when the gas pressure reached about 200 MPa, and the mean lifetime of the longest o-Ps component increased.

Źródło:

Acta Physica Polonica A; 2014, 125, 3; 812-815
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Solutions for conservative nonlinear oscillators using an approximate method based on Chebyshev series expansion of the restoring force

Autorzy:

Beléndez, A.
Hernández, A.
Beléndez, T.
Pascual, C.
Alvarez, M.
Arribas, E.

Powiązania:

https://bibliotekanauki.pl/articles/1075577.pdf

Data publikacji:

2016-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.30.Hq
02.30.Mv
05.45.-a

Opis:

Approximate solutions for small and large amplitude oscillations of conservative systems with odd nonlinearity are obtained using a "cubication" method. In this procedure, the Chebyshev polynomial expansion is used to replace the nonlinear function by a third-order polynomial equation. The original second-order differential equation, which governs the dynamics of the system, is replaced by the Duffing equation, whose exact frequency and solution are expressed in terms of the complete elliptic integral of the first kind and the Jacobi elliptic function cn, respectively. Then, the exact solution for the Duffing equation is the approximate solution for the original nonlinear differential equation. The coefficients for the linear and cubic terms of the approximate Duffing equation - obtained by "cubication" of the original second-order differential equation - depend on the initial oscillation amplitude. Six examples of different types of common conservative nonlinear oscillators are analysed to illustrate this scheme. The results obtained using the cubication method are compared with those obtained using other approximate methods such as the harmonic, linearized and rational balance methods as well as the homotopy perturbation method. Comparison of the approximate frequencies and solutions with the exact ones shows good agreement.

Źródło:

Acta Physica Polonica A; 2016, 130, 3; 667-678
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Triplet States in DOPA-Melanin and in Its Complexes with Kanamycin and Copper Cu(II) Ions

Autorzy:

Najder-Kozdrowska, L.
Pilawa, B.
Buszman, E.
Więckowski, A.
Świątkowska, L.
Wrześniok, D.
Wojtowicz, W.

Powiązania:

https://bibliotekanauki.pl/articles/1535688.pdf

Data publikacji:

2010-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.66.Hq
76.30.Rn
87.64.kh

Opis:

The mono- and biradical forms of DOPA-melanin (DOPA-eumelanin) were studied by EPR spectroscopy in 100-300 K temperature range. The existence of triplet states in DOPA-melanin was proved. The analysis of EPR spectra has shown that in DOPA-melanin and its complexes with kanamycin and $Cu^{2+}$ ions, two kinds of paramagnetic centres exist. The first of them are in doublet ground state with spin S = 1/2 and they obey the Curie law. The paramagnetic centres of the second group are in thermally excited triplet state with spin S = 1 and in this case the Curie law is not fulfilled.

Źródło:

Acta Physica Polonica A; 2010, 118, 4; 613-618
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Paramagnetic Centres in Coal Macerals

Autorzy:

Słowik, G.
Więckowski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1536501.pdf

Data publikacji:

2010-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.66.Hq
76.30.Rn
89.30.ag

Opis:

The electron paramagnetic resonance (EPR) study of coal macerals: exinite, vitrinite and inertinite separated from clarain of the Polish medium-rank coal with carbon content of 85.6 wt% C, were performed. Using the continuous microwave saturation technique (measurements at 223 K and 291 K), as a result of numerical analysis of recorded EPR spectra of exinite, vitrinite and inertinite, their multi-component structure was shown. The EPR spectra of exinite and vitrinite consist of three component lines: one Gaussian G and two Lorentzians: L1 and L3. The EPR spectra of inertinite consist of two narrow lines with Lorentzian line shape L2 and L3. Temperature measurements of studied coal macerals in the range 100-373 K were done. It was evidenced that, in group of paramagnetic centres responsible for Lorentzian L1 component line, paramagnetic centres with thermally excited triplet states (S = 1) exist. Existence of paramagnetic centres with thermally excited triplet states was not observed in inertinite.

Źródło:

Acta Physica Polonica A; 2010, 118, 3; 507-510
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 30.

Tytuł:

Some Exact and Explicit Solutions for Nonlinear Schrödinger Equations

Autorzy:

Aslan, İ.

Powiązania:

https://bibliotekanauki.pl/articles/1400189.pdf

Data publikacji:

2013-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.30.Jr
02.30.Hq
04.20.Jb

Opis:

Nonlinear models occur in many areas of applied physical sciences. This paper presents the first integral method to carry out the integration of Schrödinger-type equations in terms of traveling wave solutions. Through the established first integrals, exact traveling wave solutions are obtained under some parameter conditions.

Źródło:

Acta Physica Polonica A; 2013, 123, 1; 16-20
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

The Method of Jacobi Last Multiplier for Integrating Nonholonomic Systems

Autorzy:

Zhang, Y.

Powiązania:

https://bibliotekanauki.pl/articles/1493586.pdf

Data publikacji:

2011-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

45.20.Jj
02.30.Hq
02.30.Rz

Opis:

In this paper, a new integral method of nonholonomic dynamical systems is put forward. The differential equations of motion of nonholonomic systems in phase space are established. The definition of the Jacobi last multiplier of the systems is given, and the relation between the Jacobi last multiplier and the first integrals of the systems is discussed. The researches show that the solution of the systems can be found by the last multiplier if the quantity of first integrals of the systems is sufficient. An example is given to illustrate the application of the results.

Źródło:

Acta Physica Polonica A; 2011, 120, 3; 443-446
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Size Evolution of the Light Induced Sodium Clusters

Autorzy:

Hnat, B.
Jakubczyk, D.
Kolwas, K.
Kolwas, M.

Powiązania:

https://bibliotekanauki.pl/articles/1920745.pdf

Data publikacji:

1992-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

36.40.+d
31.70.Hq
64.70.-p

Opis:

We report the observation of the size evolution of the laser light formed clusters. A cell containing sodium vapor and the buffer gas (He) under high pressure was used in the experiment. Changes of the radius and of the density of transient clusters were observed via the time evolution of the intensity of right-angle scattered light. The rate of the cluster radius growth was found to vary from 0.012 to 0.1 μm/s.

Źródło:

Acta Physica Polonica A; 1992, 81, 6; 629-637
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Structure and Vibrational Spectra of 1,3,5-Trimethoxybenzene

Autorzy:

Pawlukojć, A.
Bator, G.
Sobczyk, L.

Powiązania:

https://bibliotekanauki.pl/articles/1813991.pdf

Data publikacji:

2007-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.30.-j
78.70.Nx
61.66.Hq

Opis:

Inelastic neutron scattering infrared and Raman spectra of the crystalline 1,3,5-trimethoxybenzene were measured and compared with simulated ones by using the Gaussian 98 and DMol3 programs at density functional theory methods. Application of the double numerical plus polarization basis set for the crystalline state within the local density Perdew and Wang (PWC functionals) approximation quite well reproduces the low frequency bands related to the methyl group librational modes, which are very sensitive to molecular interactions. Infrared spectra for the crystalline sample and $CCl_4$ solution show spectacularly the change of low frequency modes by going from the symmetric $D_{3h}$ molecules in the gas phase to asymmetric ones in the crystal.

Źródło:

Acta Physica Polonica A; 2007, 112, S; S-171-S-181
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 34.

Tytuł:

Evolution of Laser Light Induced Sodium Clusters

Autorzy:

Kolwas, M.
Kolwas, K.
Jakubczyk, D.

Powiązania:

https://bibliotekanauki.pl/articles/1931531.pdf

Data publikacji:

1994-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

64.70.-p
31.70.Hq
36.40.+d

Opis:

We investigated the growing sodium clusters, induced by the laser light resonant with a sodium dimer transition. We observed the intensity of light scattered by clusters. The clusters were produced in the stainless steel cell containing sodium vapor and helium. We obtained data on cluster mean size and dynamics from fitting the theoretical formulas to the experimental data. The model of clusters' evolution basing on the thermodynamics of the vapor-liquid transition was applied.

Źródło:

Acta Physica Polonica A; 1994, 86, 1; 257-266
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Properties of Confined Polymer Melts

Autorzy:

Sikorski, A.

Powiązania:

https://bibliotekanauki.pl/articles/2041818.pdf

Data publikacji:

2005-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.50.Ng
36.20.Ey
61.25.Hq

Opis:

Properties of simple models of confined linear polymer chains were studied by means of the Monte Carlo method. Model chains were built of united atoms (statistical segments) and embedded to a simple cubic lattice. Then polymers were put into a slit formed by two parallel impenetrable surfaces. Chain lengths were varied up to 800 segments and the density of the polymer melt was changed up to 0.5. A Metropolis-like sampling Monte Carlo algorithm was used to determine the static properties of this model. The influence of the size of the confinement, the polymer melt concentration and the chain length on the chain's size and the structure was studied. The universal behavior of all confined polymer linear chains under consideration was found and discussed.

Źródło:

Acta Physica Polonica A; 2005, 107, 3; 443-450
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Decay Kinetics from $\text{}^{4}$I $\text{}_{9}\text{}_{/}\text{}_{2}$ State of Mixed 2,6 Pyridine Dicarboxylate-Acetylacetonate Complexes

Autorzy:

Xie, R.-Q.
Flint, C. D.

Powiązania:

https://bibliotekanauki.pl/articles/1945621.pdf

Data publikacji:

1996-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

13.40.Hq
31.70.Ie
78.55.Hx

Opis:

The $\text{}^{4}$I $\text{}_{9}\text{}_{/}\text{}_{2}$ → $\text{}^{4}$I $\text{}_{15}\text{}_{/}\text{}_{2}$ luminescence decay curves for a series of complexes Er(pdc)$\text{}_{n}$(acac)$\text{}_{3-n}$ (pdc = pyridine-2,6-dicarboxylate, acac = acetylacetonate, n = 0, 1, 2, 3) as solids and in dilute aqueous solutions have been investigated. The decays are multiexponential, possible reasons for this and for the short lifetimes observed are discussed.

Źródło:

Acta Physica Polonica A; 1996, 90, 2; 323-325
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Health risk assessment of heavy metals in irrigation water, soil and vegetables from different farms in Riyadh district, Saudi Arabia

Autorzy:

Alturiqi, A.S.
Albedair, L.A.
Ali, M.H.H.

Powiązania:

https://bibliotekanauki.pl/articles/1192504.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza

Tematy:

heavy metal
vegetables
dietary intake
health risk
HQ
THQ
ILCR

Opis:

The safety and security of different foodstuffs are considered important and have a high priority in global sustainable development. The contents of Fe, Mn, Cu, Zn, Ni, Pb and Cd were estimated in edible parts of 60 vegetable samples, irrigation water and agricultural soil collected from 5 farms in suburban areas around Riyadh district, Saudi Arabia. Also, soil pollution indices, pollution load index and contamination factor (PLI, CF), bioaccumulation factor (BAF), non-carcinogenic and carcinogenic risk indices (HQ, THQ, and ILCR) were estimated. The content of heavy metals in irrigation water and soil was within the recommended permissible levels, except for Cd in soil, which exceeds permissible levels. The trend of metal concentrations in both agricultural soil and vegetables was found in the order: Fe > Mn > Zn > Cu > Ni > Pb > Cd. Cluster analysis of the metal content in vegetables showed a tendency towards the accumulation of heavy metals in the order of leaves > roots > fruits > flowers > tuber. The BAFs values found were < 1.0, HQs values for Fe, Mn, Cu, Zn and Ni were found to be < 1, while the estimated HQs for Pb and Cd were > 1, posing greater risk to the health of adults and children. THQ values were higher for children compared to adults. ILCR values for Cd showed a serious issue, as it exceeds the threshold risk limit (>10−4) in all parts of the investigated vegetables in all sampling sites.

Źródło:

Journal of Elementology; 2020, 25, 4; 1269-1289
1644-2296

Pojawia się w:

Journal of Elementology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

A Case Study of Diffusion of Innovation under Competition

Autorzy:

Gündüç, S.

Powiązania:

https://bibliotekanauki.pl/articles/1029620.pdf

Data publikacji:

2018-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

PACS/topics:02.30.Hq
02.60.Cb
89.65.Gh

Opis:

In this work, the aim is to discuss the relative importance of the driving parameters of the diffusion of innovation under competition. As a case study the competitive existence of Android and iOS operating systems are modeled in the context of an extended Bass model. The chosen model consists of two coupled differential equations. Each differential equation has the same form of the well known Bass equation with an extra term which represents the effect of the existence of the competitor. Since the smartphone sales and usage are globally well documented, publicly available global smartphone market share and sales data are used to determine the model parameter values. The smartphone global market share data spans 28 quarters starting from the first quarter of 2009. The distribution of the market share in the first quarter has been used as the initial values of the competing operating systems. A minimization process obtains the free parameters (six in total) of the differential equations. The values of the parameters are fixed by minimizing the difference between the solution of Bass equation and the smartphone global market share data. The parameter values of iOS and Android operating systems indicate that, on the worldwide scale, the adaptation of new ideas/products the dominantly led by the personal interactions. In fact, through social networks, information flow is immense, and individuals rely on the information obtained directly from a trusted individual. Publicity parameter values indicate that very rarely decision of an individual is formed by only the mass media or publicity. On the contrary, to the publicity parameter, it is observed that the existence of a competitor has a considerable effect on the sales of both parties.

Źródło:

Acta Physica Polonica A; 2018, 133, 6; 1465-1469
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Excited-State Equilibration and the Fluorescence-Absorption Ratio

Autorzy:

Knox, R. S.

Powiązania:

https://bibliotekanauki.pl/articles/1993700.pdf

Data publikacji:

1999-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

33.70.Jg
32.50.+d
31.70.Hq
42.50.Md

Opis:

In any complex system at temperature T the absorption cross-section and fluorescent power at a given photon energy are connected by a simple relation if the system is in thermal equilibrium while occupying one particular electronic excited state. Although this situation is impossible in principle because of finite excited-state lifetimes, it is often approximated to the extent that the simple relation, which is expressed as a linear function of energy with slope -1/k_{B}T, holds in a variety of cases. (The usual symbols for Boltzmann's constant and absolute temperature are used.) Observed deviations are of two principal kinds: a slope characteristic of some temperature T* other than ambient, and departures from a single pure straight line. The latter may include seemingly random variations and in some cases multiple regions of straight-line behavior. We have recently introduced an effective temperature T*(E), derived from the actual local slope of the putative straight line at energy E, which turns out to be a very sensitive detector of deviations from the ideal and, we believe, from equilibrium in the excited state. Plots of T*(E) display a variety of features. An anomaly in the T*(E) spectrum of chlorophyll a can be analyzed on this model, indicating a second weakly fluorescent state about 70 meV below the well-known Q_{y} band. The cases of chlorophyll and many others are included in a selective review of applications of the universal relation to fluorescent systems.

Źródło:

Acta Physica Polonica A; 1999, 95, 1; 85-103
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Paramagnetic Centres in Oxidised Coal

Autorzy:

Najder-Kozdrowska, L.
Samoilova, R.
Kappl, R.
Hüttermann, J.
Więckowski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1536451.pdf

Data publikacji:

2010-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

33.35.+r
61.66.Hq
76.30.Rn
89.30.ag

Opis:

This paper comprises the results obtained by continuous wave (cw)/pulse electron paramagnetic resonance spectroscopy for oxidised coals. The values of EPR linewidths are different for samples of coal treated by different chemical agents. The asymmetric EPR line shape indicates to complex composition of paramagnetic centres in coal. In coal oxidised by $HNO_3$ big changes of linewidth with temperature were observed. For all samples the spin-lattice relaxation time $T_1$ was determined by pulse EPR method. The correlation between used chemical agents and the value of $T_1$ was established.

Źródło:

Acta Physica Polonica A; 2010, 118, 3; 475-479
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Buckling Analysis of a Rotationally Restrained Single Walled Carbon Nanotube

Autorzy:

Yayli, M.

Powiązania:

https://bibliotekanauki.pl/articles/1398664.pdf

Data publikacji:

2015-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

03.65.Db
02.30.Nw
02.30.Hq
61.46.+w

Opis:

This paper presents an analytical formulation of nonlocal elasticity theory for the buckling analysis of simply supported carbon nanotubes with rotational springs at both ends. The lateral displacement function is represented by a Fourier sine series expansion. Stoke's transformation is applied to construct the coefficient matrix of the corresponding systems of linear equations. This matrix gives more flexibility in boundary conditions. The accuracy of proposed method is validated for three well-known boundary conditions available in the literature. A very good agreement has been obtained. The present method permits to have more efficient stability matrix for calculating the buckling loads of carbon nanotubes with any desired boundary conditions.

Źródło:

Acta Physica Polonica A; 2015, 127, 3; 678-683
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Photon Force-Induced Phase Transition Dynamics of Single Hydrogel Nanoparticles in Water

Autorzy:

Hosokawa, C.
Matsumura, Y.
Yoshikawa, H.
Iwai, K.
Masuhara, H.

Powiązania:

https://bibliotekanauki.pl/articles/1813984.pdf

Data publikacji:

2007-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

87.80.Cc
33.50.Dq
61.25.Hq
87.64.-t

Opis:

We investigated laser-induced phase transition dynamics of μm sized single poly(N-isopropylacrylamide) hydrogel particles in water. Single poly(N-isopropylacrylamide) gel particles labeled with a polarity-sensitive fluorescent probe monomer were optically trapped by a focused laser beam and its fluorescence dynamics was analyzed. The fluorescence intensity of trapped single gel particles was increased with the trapping laser power, while the fluorescence peak wavelength was not changed. Temperature-induced changes of fluorescence properties of the single particle were confirmed to be similar to those of the bulk solution. These behaviors are well interpreted by considering that the fluorescence intensity and fluorescence peak reflect local interactions between the fluorescent probe and attaching (bound) water molecules and effective polarity determined by (free) water content in the particle, respectively. A change in the fluorescence peak wavelength after laser trapping was followed and its blue-shift was confirmed to occur within a few hundreds seconds, indicating that a single gel particle gradually attains to a globular state on this timescale, expelling initially free water molecules and then bound ones.

Źródło:

Acta Physica Polonica A; 2007, 112, S; S-57-S-70
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Hydrochinon. Oznaczanie w powietrzu na stanowiskach pracy
Hydroquinone. Determination in workplace air

Autorzy:

Jeżewska, A.
Woźnica, A.

Powiązania:

https://bibliotekanauki.pl/articles/138447.pdf

Data publikacji:

2014

Wydawca:

Centralny Instytut Ochrony Pracy

Tematy:

hydrochinon
HQ
metoda analityczna
powietrze na stanowiskach pracy
hydroquinone
analytical method
workplace air

Opis:

W artykule przedstawiono metodę oznaczania hydrochinonu (HQ) w powietrzu na stanowiskach pracy z zastosowaniem wysokosprawnej chromatografii cieczowej (HPLC) z detektorem diodowym (DAD). Metoda polega na: pobieraniu próbek powietrza zawierającego hydrochinon na rurki wypełnione żelem krzemionkowym z naniesionym kwasem siarkowym, desorpcji acetonitrylem i analizie chromatograficznej otrzymanego roztworu. Analizę prowadzono w układzie faz odwróconych (faza ruchoma: acetonitryl: woda) z zastosowaniem kolumny Ultra C18. Zakres pomiarowy wynosi 0,1 - 2 mg/m³ przy pobieraniu 20 l powietrza. Granica wykrywalności (LOD) metody wynosi 0,35 µg/m3, natomiast granica oznaczalności (LOQ) 1,04 µg/m3. Opracowaną metodę oznaczania hydrochinonu zapisano w postaci procedury analitycznej, którą zamieszczono w Załączniku.
This method describes how to measure hydroquinone (HQ) in workplace air using HPLC with a diode array detector (DAD). Hydroquinone present in a measured volume of air is collected onto a sulfuric acid-treated silica gel tube. Samples are desorbed with acetonitrile. The determination was carried out in the reverse-phase system (mobile phase: acetonitrile: water) using an Ultra C18 column. The measurement range was 0.1 - 2 mg / m3 for a 20-L air sample. Limit of detection (LOD): 0.35 uq/ m3 and limit of quantification (LOQ): 1.04 uq/ m3. The developed method of determining hydroquinone has been recorded as an analytical procedure, which is available in the Appendix.

Źródło:

Podstawy i Metody Oceny Środowiska Pracy; 2014, 3 (81); 57-70
1231-868X

Pojawia się w:

Podstawy i Metody Oceny Środowiska Pracy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Studies of the Bacterial Surfaces by XPS and SEM Methods

Autorzy:

Płoszaj-Pyrek, J.
Talik, E.
Piotrowska-Seget, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1197681.pdf

Data publikacji:

2014-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

87.64.-t
71.20.Rv
61.66.Hq
31.50.Gh

Opis:

This work presents the results of studies on bacteria Bacillus subtilis which was grown at different temperatures. The experiments were carried out using X-ray photoelectron spectroscopy and scanning electron microscope equipped with "cryo-chamber", which gives the possibility of testing biological samples in a frozen state. These methods enabled receiving images of surface topography of the bacteria and demarcated their chemical composition. After deconvolution of the lines C 1s and O 1s information concerning the intensity of the various functional groups in the bindings presented in the cell walls surface of tested strain and reallocation in relation to the temperature of incubation was obtained. These changes are visible in the form of an additional peak in both the C 1s and O 1s in bacteria cultured in suboptimum temperature.

Źródło:

Acta Physica Polonica A; 2014, 125, 4; 929-931
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Elastic Properties of Colossal Magnetoresistive Manganites $R_{0.67} Sr_{0.33} Mn O_3$ (R = Pr, Nd, Gd)

Autorzy:

Reddy, Y.

Powiązania:

https://bibliotekanauki.pl/articles/1398673.pdf

Data publikacji:

2016-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.47.Gk
75.47.Lx
62.20.de
43.20.Hq

Opis:

The polycrystalline bulk samples of $R_{0.67} Sr_{0.33} Mn O_3$ (R = Pr, Nd, Gd) were prepared by solid state reaction method and characterized by powder X-ray diffraction. The room temperature elastic behavior of these materials was investigated by employing ultrasonic pulse transmission technique at 1 MHz. The values of elastic constants were computed from longitudinal and shear velocities. The measured values were corrected to zero porosity using Hasselman and Fulrath's formulae. The variation of elastic moduli with the size of rare earth ion is interpreted in terms of strength of interatomic bonding.

Źródło:

Acta Physica Polonica A; 2016, 129, 1; 113-116
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

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

/5

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Skocz do pozycji: 47.

Tytuł:

An Explicit Analytic Solution to the Thomas-Fermi Equation by the Improved Differential Transform Method

Autorzy:

Fatoorehchi, H.
Abolghasemi, H.

Powiązania:

https://bibliotekanauki.pl/articles/1198516.pdf

Data publikacji:

2014-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.30.Hq
02.30.Mv
02.60.Lj
21.10.Ft
31.15.-p

Opis:

In this paper, a newly proposed analytical scheme by the authors namely the improved differential transform method is employed to provide an explicit series solution to the Thomas-Fermi equation. The solution procedure is very straightforward, requiring merely elementary operations together with differentiation, and ends up in a recursive formula involving the Adomian polynomials to afford the unknown coefficients. Unlike many other methods, our approach is free of integration and hence can be of computational interest. In addition, a very good agreement between the proposed solution and the results from several well-known works in the literature is demonstrated.

Źródło:

Acta Physica Polonica A; 2014, 125, 5; 1083-1087
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Groups of Paramagnetic Centres in Reduced and Methylated Low Rank Coal

Autorzy:

Pilawa, B.
Wachowska, H.
Kozłowski, M.
Więckowski, A.
Najder-Kozdrowska, L.

Powiązania:

https://bibliotekanauki.pl/articles/1401865.pdf

Data publikacji:

2015-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

33.35.+r
61.66.Hq
76.30.-v
76.30.Rn
89.30.ag

Opis:

Low rank Illinois No. 6 coal was studied by electron paramagnetic resonance EPR spectroscopy. The parameters of EPR spectra (spectroscopic splitting factors g, linewidths $\DeltaB_{pp}$, concentrations of paramagnetic centres N) were measured for row and chemically treated coal (demineralized, reduced and methylated samples). The multi-component structure of experimental spectra of this coal was proved. Two groups of paramagnetic centres responsible for broad Lorentzian 1 and narrow Lorentzian 2 lines exist in studied samples. Paramagnetic centres connected with component lines revealed different behaviour during chemical treatments.

Źródło:

Acta Physica Polonica A; 2015, 128, 3; 264-267
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Analytic Approximations for Thomas-Fermi Equation

Autorzy:

El-Nahhas, A.

Powiązania:

https://bibliotekanauki.pl/articles/1812056.pdf

Data publikacji:

2008-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.30.Hq
02.30.Mv
02.60.Lj
21.10.Ft
31.15.-p

Opis:

In this paper, we give an analytic approximation to the solution of the Thomas-Fermi equation using the homotopy analysis method and with the use of a polynomial exponential basis.

Źródło:

Acta Physica Polonica A; 2008, 114, 4; 913-918
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Dielectric and X-ray Studies of Eleventh and Twelfth Members of Two Isothiocyanato Mesogenic Compounds

Autorzy:

Jasiurkowska, M.
Budziak, A.
Czub, J.
Urban, S.

Powiązania:

https://bibliotekanauki.pl/articles/2047170.pdf

Data publikacji:

2006-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.10.Eq
61.66.Hq
64.70.Md
77.22.-d
77.22.Gm

Opis:

Results of the dielectric and X-ray studies of the long-alkyl-chain members (n=11, 12) of two homologous series: nBT (4-n-alkyl-4'-isothiocyanato-biphenyl) and nCHBT (4-trans-4'-n-alkyl-cyclohexyl-isothiocyanato-benzene) in their liquid crystalline phases are presented. These compounds exhibit different polymorphisms: the nematic phase for $n$CHBTs and the smectic E and smectic A phases for nBTs. The dielectric measurements were performed in a wide frequency range of 1 kHz-3 GHz. The layer thickness in the smectic E and smectic A phases and the orthorhombic unit cell parameters of the smectic E phase were determined using the small angle X-ray diffraction method. In the smectic E phase the layer-thickness-to-molecular-length ratios are found to be close to 1. The corresponding ratios observed for the smectic A phase of $n$BTs are considerably higher (≈1.24), which indicates that an alternating head-to-tail arrangement of molecules in the layers is favored. The rotational dynamics of molecules in the smectic E phases is discussed in relation to their packing in a unit cell.

Źródło:

Acta Physica Polonica A; 2006, 110, 6; 795-805
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Tajemnice chińskich Torów

Autorzy:

Szulc, Tomasz.

Powiązania:

Wojsko i Technika 2018, nr 1, s. 26-30

Data publikacji:

2018

Tematy:

Zestawy rakietowe przeciwlotnicze
Budowa i konstrukcje
HQ-17 (zestaw) dane taktyczno-techniczne
Artykuł z czasopisma wojskowego

Opis:

Fotografie.

Dostawca treści:

Bibliografia CBW

/5

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Skocz do pozycji: 52.

Tytuł:

EPR characteristics of activated carbon for hydrogen production by the thermo-catalytic decomposition of methane

Autorzy:

Więckowski, A.
Najder-Kozdrowska, L.
Rechnia, P.
Malaika, A.
Krzyżyńska, B.
Kozłowski, M.

Powiązania:

https://bibliotekanauki.pl/articles/1158900.pdf

Data publikacji:

2016-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

33.35.+r
61.66.Hq
76.30.-v
82.30.Lp
82.65.+r
88.30.ej

Opis:

The electron paramagnetic resonance (EPR) method was used to characterize samples of activated coal before and after reactions of the catalytic decomposition of methane and ethanol at temperatures of 1023 K (750°C), 1123 K (850°C) and 1223 K (950°C). The EPR parameters: spectroscopic splitting factor g, peak-to-peak linewidth ΔBₚₚ, and spin concentration c were measured. During the ethanol-assisted catalytic decomposition of methane carbon-located-spin radicals are partially transformed into oxygen-located-spin radicals.

Źródło:

Acta Physica Polonica A; 2016, 130, 3; 701-704
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Dependence of Order and Dynamics in Polymers and Elastomers under Deformation Revealed by NMR Techniques

Autorzy:

Stapf, S.
Kariyo, S.

Powiązania:

https://bibliotekanauki.pl/articles/2043553.pdf

Data publikacji:

2005-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.05.Lg
82.35.Lr
76.60.-k
61.25.Hq
36.20.Ey
81.40.Lm

Opis:

Uniaxial stretching and swelling are considered as two limiting cases of deformations of elastomers. Under both conditions, the molecular dynamics is changed with respect to the behavior that describes the undisturbed, equilibrium elastomer. Particularly the spectrum of segmental motions, which reveals itself in the frequency-dependence of the longitudinal NMR relaxation time, is discussed in this study, but also order effects expressed via the dipolar coupling strength are investigated. For stretched elastomers, a significant change of the relaxation dispersion is found for three different types of rubber; it is a consequence of a change of the mode spectrum of segmental motions that becomes obvious at low frequencies (below 1 MHz at room temperature). In swollen elastomers, on the other hand, a cross-over towards a behavior expected for semi-dilute solutions is found, and a comparison to solutions of uncross-linked polymers reveals a significant effect of the cross-links only in the kHz range. A much more pronounced difference between elastomers and polymer solutions, however, is found from double-quantum encoded NMR measurements where the residual order introduced by the presence of permanent cross-links is maintained even in the presence of solvent.

Źródło:

Acta Physica Polonica A; 2005, 108, 2; 247-259
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

Trzy różne światy : wojskowe bazy w tym górzystym i surowym kraju mogą mieć bardzo różne oblicza

Autorzy:

Bączyk, Norbert.

Powiązania:

Polska Zbrojna 2008, nr 14, s. 57-59

Data publikacji:

2008

Tematy:

Polski Kontyngent Wojskowy w składzie Sił Sojuszniczych w Islamskim Państwie Afganistanu Polska Grupa Bojowa Kompania Bravo

Opis:

Fot.

Dostawca treści:

Bibliografia CBW

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Skocz do pozycji: 55.

Tytuł:

S-300P Kim Dzong Una : północnokoreański system przeciwlotniczy KN-06 i jego rosyjskie oraz chińskie odpowiedniki

Autorzy:

Szulc, Tomasz.

Powiązania:

Wojsko i Technika 2016, nr 7, s. 36-42

Data publikacji:

2016

Tematy:

Zestawy rakietowe przeciwlotnicze budowa i konstrukcje Korea Północna
KN-06 (zestaw) budowa i konstrukcje Korea Północna
Zestawy rakietowe przeciwlotnicze budowa i konstrukcje Rosja
S-300P (zestaw) budowa i konstrukcje Rosja
Zestawy rakietowe przeciwlotnicze budowa i konstrukcje Chiny
HQ-9 (zestaw) budowa i konstrukcje Chiny

Opis:

Fot.

Dostawca treści:

Bibliografia CBW

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