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Wyświetlanie 1-15 z 28
Tytuł:
Application of Conducting Organic Solids for Biological Sensors: Successes and Problems
Autorzy:
Kryszewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1932273.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.65.-i
81.60.Jw
Opis:
Studies on the basic properties and fabrication of biosensors based on conducting organic polymers have been reviewed. Several types of biosensors and some classes of conducting polymers used in biosensors are described. It is shown that their selective responses towards a dissolved analyte have lead to their successful application in a new generation of ion, molecular and biosensors. Some important open problems in this fast growing field have also been indicated. They are related with the complex interactions of biomolecules and/or cells with the conducting transducers. The present tendency to extreme miniaturization of biosensors related to the utilization of a few biomolecules and/or a single cell as a heart of biosensing devices seems to be very close to molecular electronics.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 683-698
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dispersion Properties of Optical Polymers
Autorzy:
Sultanova, N.
Kasarova, S.
Nikolov, I.
Powiązania:
https://bibliotekanauki.pl/articles/1795587.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Jk
78.20.Ci
78.30.Jw
Opis:
In this report dispersion properties of different types of optical polymers are discussed on the base of measured refractive indices and the Cauchy-Schott approximation. A number of dispersion curves are presented in the visible and near infrared spectral regions between 400 and 1060 nm. A comparison with some optical glasses with similar refraction is performed. The nonlinear dependence of dn/dλ of polymer materials and test glasses on the wavelength is calculated and analyzed. Normalized dispersion curves at 550 nm and 880 nm are presented to illustrate better the dispersion of the polymers in the considered spectral regions, separately. Abbe numbers are calculated to exhibit the mean and partial dispersion.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 585-587
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exciton Electro-Absorption at Non-Zero Wave Vector
Autorzy:
Slawik, M.
Petelenz, P.
Powiązania:
https://bibliotekanauki.pl/articles/1933598.pdf
Data publikacji:
1995-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Jw
78.20.-e
78.40.-q
Opis:
Based on a previously proposed two-dimensional model of a polyacene crystal, the contributions to the electro-absorption signal from different points of the exciton Brillouin zone are calculated. They are shown to differ substantially both in amplitude and in shape. This makes electro-absorption spectra very sensitive to vibronic coupling. On the one hand, the new factor is a potential complication in theoretical interpretations. On the other hand, it favours electro-absorption spectroscopy as a promising experimental tool to study vibronic effects.
Źródło:
Acta Physica Polonica A; 1995, 88, 2; 401-409
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Correlations and Electron-Molecular Vibration Coupling in Pentamerized Charge Transfer Crystals
Autorzy:
Yartsev, V. M.
Garrigou-Lagrange, C.
Powiązania:
https://bibliotekanauki.pl/articles/1933375.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.45.Gm
78.30.Jw
Opis:
A cluster approach is used for a theoretical description of the optical properties of pentamerized low-dimensional molecular crystals. Electronic correlations are taken into account explicitly in the Hubbard model for 1, 2, 3, 4 and 5 electrons in a linear pentamer, as well as coupling of electrons to the totally symmetric intramolecular vibrations. Calculated absorbance is compared to the measured one in pentamerized salt of TCNQ and TTF molecules.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 819-822
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inductive-Resonant Theory of Nonradiative Transitions for Complex Organic Molecules in Condensed Phase
Autorzy:
Ermolaev, V. L.
Sveshnikova, E. B.
Powiązania:
https://bibliotekanauki.pl/articles/1995259.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.Dq
78.30.Jw
Opis:
Ours and literature data on influence of replacement of deuterium by protium in complex organic molecules on nonradiative triplet-singlet transition rates are discussed from the standpoint of the inductive-resonant theory of this process. It has been shown that the extent to which the protium introduction in molecule affects the nonradiative rate depends on distance between protium atom and the vibronic molecular oscillator of triplet-singlet transition and on π -electronic density near-by protium.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 299-308
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modern Brachytherapy Techniques - Real-Time High Dose Rate Brachytherapy for Prostate Cancer
Autorzy:
Miszczak, D.
Powiązania:
https://bibliotekanauki.pl/articles/1810214.pdf
Data publikacji:
2009-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.53.Jw
87.55.de
87.56.-v
87.63.-d
Opis:
The "real time" technique of high dose rate brachytherapy of the prostate gland is described from the point of view of the medical physicist, as an illustration of modern radiotherapy techniques currently applied at the Centre of Oncology in Krakow. This technique, based on ultrasound imaging and on-line calculations of dose distribution around catheters inserted into the prostate volume in which a radioactive Ir-192 source is moved with the aid of an afterloading apparatus, is performed in operating-room conditions in close cooperation with the physician within stringent time limits.
Źródło:
Acta Physica Polonica A; 2009, 115, 2; 583-585
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Different Types of Electron-Vibrational Interaction in BEDT-TTF Salts with Halide-Mercurate Anions Studied by IR Spectroscopy
Autorzy:
Kaplunov, M. G.
Lyubovskaya, R. N.
Powiązania:
https://bibliotekanauki.pl/articles/1933368.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Jw
Opis:
Infrared optical properties of a large family of BEDT-TTF salts with mercury-halide anions are studied which exhibit different types of electron-vibrational spectra.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 807-810
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First Order Hyperpolarizabilities, NPA and Fukui Functions of Cyclohexanone by Density Functional Theory Method
Autorzy:
Gangadharan, Rubarani
Sampath Krishnan, S.
Powiązania:
https://bibliotekanauki.pl/articles/1398896.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.-v
78.30.Jw
31.15.Ew
Opis:
The molecular structure of cyclohexanone was calculated by the B3LYP density functional model with 6-311++G(d,p) basis set by Gaussian program. The results from natural bond orbital analysis have been analyzed in terms of the hybridization of atoms and the electronic structure of the title molecule. The formation of hydrogen bond was investigated using natural bond orbital calculation. The electron density based local reactivity descriptors such as Fukui functions were calculated. The dipole moment (μ) and polarizability (α), anisotropy polarizability (Δα) and first order hyperpolarizability ($β_\text{tot}$) of the molecule have been reported. Thermodynamic properties of the title compound were calculated at different temperatures.
Źródło:
Acta Physica Polonica A; 2015, 127, 3; 748-752
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Model Calculation of Infrared Spectra in Cyclohexanol
Autorzy:
Nowina Konopka, M.
Wasiutyński, T.
Powiązania:
https://bibliotekanauki.pl/articles/2011075.pdf
Data publikacji:
1999-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.50.Ah
63.20.Dj
78.20.Bh
78.30.Jw
78.30.Ly
Opis:
A model calculation based on semiempirical methods for the cyclohexanol molecules is presented. Energetically preferred molecular conformations and possibility of different hydrogen bond networks in the crystal are discussed. The calculated and the experimental infrared spectra are compared. The results corroborate earlier suggestions that the rich polymorphism of cyclohexanol is due to the existence of both axial and equatorial isomers in solid phases and different architecture of hydrogen bonds network.
Źródło:
Acta Physica Polonica A; 1999, 96, 3-4; 399-407
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Absorption of Polymer Films Doped with BEDT-TTF Polyiodides
Autorzy:
Helberg, H. W.
Staerk, D.
Ulański, J.
Jeszka, J. K.
Powiązania:
https://bibliotekanauki.pl/articles/1933405.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.40.Ha
78.30.Jw
74.70.Kn
Opis:
Conducting reticulate doped polymeric films containing BEDT-TTF iodide crystalline network were annealed in order to transform the crystallites into crystal phases with metallic conductivity. Measured optical absorption spectra show that annealing shifts the absorption band to higher frequencies and increases the transparency of the films. This behavior corresponds to the transformation of the α-phase into the superconducting α$\text{}_{t}$-phase observed in (BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$ single crystals.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 893-897
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Study of the Polarized Reflectivity of TEA(TCNQ)$\text{}_{2}$ Single Crystal
Autorzy:
Olejniczak, I.
Graja, A.
Powiązania:
https://bibliotekanauki.pl/articles/1929208.pdf
Data publikacji:
1993-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Jw
33.10.Lb
33.20.Ea
33.90.+h
Opis:
The infrared reflection spectra of the organic quasi-one-dimensional semiconductor triethylammonium (TCNQ)$\text{}_{2}$ between 80 and 300 K are reported. Characteristic changes in the temperature dependencies of the bands assigned to the donor vibrations are observed. An interpretation of the electron-molecular vibration coupling in terms of the dimer theory is discussed. It is concluded that the thermal evolution of the spectrum corroborates the semiconductor-semiconductor type of phase transition attributed to the cation disorder.
Źródło:
Acta Physica Polonica A; 1993, 83, 4; 517-526
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic Investigations of Charge Transfer Salt VINΦ$\text{}_{2}$(TCNQ)$\text{}_{2}$
Autorzy:
Łapiński, A.
Świetlik, R.
Strzelecka, H.
Veber, M.
Powiązania:
https://bibliotekanauki.pl/articles/1933382.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.38.+i
78.30.Jw
78.40.-q
Opis:
VINΦ$\text{}_{2}$(TCNQ)$\text{}_{2}$ is a salt with two different, non-parallel TCNQ stacks. The polarized reflectance spectra from single crystals in the IR region 660-5200 cm$\text{}^{-1}$, the powder absorption spectra 400-45000 cm$\text{}^{-1}$ and FT-NIR Raman spectra of VINΦ$\text{}_{2}$(TCNQ)$\text{}_{2}$ are measured at room temperature. Moreover, the temperature dependence of powder absorption spectra in the frequency range 400-7900 cm$\text{}^{-1}$ are studied. The nature of electronic bands, the anisotropy of optical conductivity, the temperature dependence of some vibrational bands and the charge distribution on different TCNQ stacks are discussed.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 835-841
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ESR Studies of Fast Electron Irradiated Ferroelectric Poly(Vinylidene Fluoride)
Autorzy:
Goslar, J.
Hilczer, B.
Smogór, H.
Powiązania:
https://bibliotekanauki.pl/articles/2043394.pdf
Data publikacji:
2005-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.Fe
61.82.Pv
76.30.Rn
77.84.Jd
78.30.Jw
Opis:
Radiation-induced functionalization of ferroelectric poly(vinylidene fluoride) was studied by ESR spectroscopy. The samples were irradiated in the high vacuum of a Van de Graaff accelerator with 1.0 MeV and 1.5 MeV electrons at room temperature and the decay of free radicals was studied after transferring the samples into the air. The samples exhibit a multicomponent ESR spectrum that can be decomposed into: a large asymmetric signal in the centre related to peroxy radicals, a quintet with hyperfine splitting A$\text{}_{F}$ = 4.3 mT centred at g = 2.004, assigned to the in-chain radical (-CF$\text{}_{2}$-CH-CF$\text{}_{2}$-), and a triplet due to an end-chain (-CH$\text{}_{2}$) radical with A$\text{}_{H}$ = 1.6 mT and g = 2.009.
Źródło:
Acta Physica Polonica A; 2005, 108, 1; 89-94
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Concept of the Auditory Training for Blind and Visually Impaired Children and Teenagers
Autorzy:
Skrodzka, E.
Maciągowski, M.
Furmann, A.
Powiązania:
https://bibliotekanauki.pl/articles/1197515.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.66.Yw
43.66.Hg
43.66.Jw
43.66.Qp
Opis:
The paper was inspired by the hitherto published results concerning provision of efficient assistance to visually impaired persons by means of acoustic and vibratory signals. The aim of the auditory training is to shorten the time necessary for execution of auditory information processing, sensibilize blind persons to differences in sounds and teach them to focus auditory attention on small differences in parameters of acoustic waves, in order to achieve independent and correct interpretation of environment by hearing and listening. The basic concept of the auditory training addressed to blind or visually impaired children and teenagers is presented in detail. Preliminary verification of the effectiveness of training of young adults without vision impairments has not shown statistically significant differences in performance before and after the training. Possible reasons for such an effect are pointed out and solutions are suggested.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-31-A-37
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Dimer and Tetramer Models for Interpretation of the IR Spectra of TEA(TCNQ)$\text{}_{2}$
Autorzy:
Olejniczak, I.
Graja, A.
Powiązania:
https://bibliotekanauki.pl/articles/1930617.pdf
Data publikacji:
1994-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.10.Lb
33.20.Ea
33.90.+h
78.30.Jw
Opis:
An interpretation of the IR polarized spectra of the organic quasi-one--dimensional semiconductor triethylammonium (TCNQ)$\text{}_{2}$, between 80 and 300 K, is discussed in terms of the dimer and tetramer theories. It is concluded that the dimer model is acceptable only for describing high-T phase of TEA(TCNQ)$\text{}_{2}$. The tetramer model is more adequate for an interpretation of the IR spectra of the salt within the large temperature range. It is also shown that the phase transition influences distinctly neither vibronic (electron-molecular vibration coupled) modes nor conformity of the experimental spectra with calculated ones according to the dimer or tetramer theory.
Źródło:
Acta Physica Polonica A; 1994, 85, 3; 497-507
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

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