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Wyszukujesz frazę "Sęk, A." wg kryterium: Autor


Tytuł:
The Influence of a Single Therapeutic Dose of Methadone on Selected Auditory Functions in Patients Addicted to Opioids and Undergoing Substitution Therapy – a Preliminary Study
Autorzy:
Tarnowska, E.
Wicher, A.
Sęk, A.
Gorzelańczyk, E. J.
Powiązania:
https://bibliotekanauki.pl/articles/176565.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
methadone
opioids
speech intelligibility
otoacoustic emissions
hearing threshold
Opis:
The main purpose of this research was to determine the influence of a therapeutic dose of an opioid drug (methadone) on selected auditory functions in patients addicted to opioids (recognition ICD-10; F11) and undergoing substitution therapy. Various hearing tests were used in this research – pure tone audiometry, impedance audiometry, otoacoustic emission measurement, and a speech in noise test – in two sessions, before and after methadone intake. It was found that methadone causes an improvement in speech intelligibility when speech is presented in speech-like noise, and slightly decreases hearing thresholds [dB HL]. Methadone consumption has no significant impact on distortion product otoacoustic emissions levels (DPOAE). In summary, a prescribed methadone dose does not worsen the hearing of opioid-dependent subjects.
Źródło:
Archives of Acoustics; 2018, 43, 1; 137-146
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie procesu nasiąkania struktur porowatych
Investigation on imbibition of porous structures
Autorzy:
Sęk, J.
Tryluk, M.
Kucharek, A.
Powiązania:
https://bibliotekanauki.pl/articles/2070553.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
ciała porowate
nasiąkanie
równanie Washburna
porous media
imbibition
Washburn equation
Opis:
Podjęto próbę zaproponowania zależności, które pozwalałyby z większą dokładnością niż powszechnie stosowane równanie Washbuna przewidywać przebieg procesu nasiąkania materiałów porowatych. Zaproponowano wykorzystanie czterech takich równań sprawdzając ich przydatność w oparciu o własne dane doświadczalne.
An attempt was carried out to provide dependences that would allow one to predict a course of imbibition processes with higher accuracy then the commonly used Was/t6HrM equation. Four such formulae were proposed and yerified using own experimental data.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 4; 112-113
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie procesu przesiąkania roztworów olejów roślinnych i substancji ropopochodnych przez ośrodek porowaty
Investigation of the percolation of the solutions of vegetable oils and crude oil derivatives through porous bed
Autorzy:
Sęk, J.
Dziubiński, M.
Błaszczyk, M.
Padyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/401223.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
przesiąkanie
złoża porowate
zanieczyszczenie gleb
turbidymetria
percolation
porous bed
turbidymetry
Opis:
Ropa naftowa i jej pochodne stanowią jedno z ważniejszych źródeł zanieczyszczeń gruntów i wód gruntowych. Postępująca industrializacja oraz rozwój motoryzacji są przyczyną większego zapotrzebowania na produkty naftowe. Wzrost wydobycia, przetwórstwa i zużycia ropy naftowej nieuchronnie pociąga za sobą zwiększenie przypadków zanieczyszczenia środowiska związkami ropopochodnymi. W pracy tej przedstawione zostały badania przesiąkania cieczy o różnych właściwościach fizykochemicznych przez warstwy ziarniste w warunkach nieustalonych. Podjęta została próba opisu zjawiska przesiąkania płynów modelowych za pomocą równań matematycznych uwzględniających wpływ lepkości cieczy na przebieg tego procesu. Podjęto także próbę oszacowania łatwości wymywania związków ropopochodnych z warstwy ziarnistej za pomocą wody.
Crude oil and its derivatives are one of the major sources of pollution of land and groundwater. Increasing industrialization and development of automotive industry are causing a greater demand for oil products. The increase in mining, processing and consumption of oil will inevitably entail an increase in cases of environmental pollution with these compounds. In this work were presented penetration research liquids with different physical and chemical properties of granular layer in transients term. Attempt is made to describe the phenomenon of percolation fluid models using mathematical equations taking into account the effect of viscosity on this process. An attempt to estimate the ease of leaching of petroleum compounds from the granular layer by water. The aim of this study was to determine the efficiency of migration processes of high-viscosity substance in the soil.
Źródło:
Inżynieria Ekologiczna; 2011, 26; 48-58
2081-139X
2392-0629
Pojawia się w:
Inżynieria Ekologiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie procesu przesiąkania wody przez warstwy ziarniste w warunkach nieustalonych
Non-steady water percolation into granular beds
Autorzy:
Sęk, J.
Stopczyk, A.
Browarski, T.
Powiązania:
https://bibliotekanauki.pl/articles/2070939.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
warstwa ziarnista
przesiąkanie wody
opory przepływu
granular beds
percolation
flow resistance
Opis:
Przeprowadzono badania procesu przesiąkania wody w warunkach nieustalonych przez warstwy ziarniste o różnej granulacji i różnej zawartości początkowej wilgoci. Wykazano, że proces ten może być podzielony na dwa etapy. W czasie pierwszego z nich zachodzi saturacja warstwy porowatej, a przebieg tego zjawiska ma charakter liniowy. Zaproponowany opis matematyczny pozwalający wyznaczyć prędkość wsiąkania w warstwę nieza-wierającą wilgoci. Przebieg drugiego etapu opisano za pomocą zależności potęgowej wprowadzając pojęcie współczynnika oporów przepływu, korzystając przy tym z zasad opisujących przebieg zjawisk grawitacyjnego wypływu cieczy ze zbiornika
Investigations concerning the non-steady water percolation into granular beds were performed. Two process stages were distinguished. In the first one rising saturation of the bed occurred and it can be described using linear equations. The applied procedure aHowed one to determine the percolation velocity in beds during a dry state. The second process stage was described using the approach typical for gravitational flow from a tank. A concept of flow resistance coefficient was introduced.
Źródło:
Inżynieria i Aparatura Chemiczna; 2010, 2; 111-112
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulacje numeryczna procesu koalescencji w emulsjach spożywczych
Numerical simulations of coalescence proces in food emulsions
Autorzy:
Sęk, J.
Strzelecka, A.
Powiązania:
https://bibliotekanauki.pl/articles/2071653.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
emulsja
koalescencja
śmietankowanie
symulacja numeryczna
emulsions
coalescence
creaming
numerical simulation
Opis:
Badano numerycznie proces koalescencji i śmietankowania w emulsjach. Stworzono modele numeryczne układów dwufazowych zawierających regularnie rozmieszczone krople fazy rozproszonej. Przeprowadzono symulacje zachowania się takich rojów w warunkach różnych wartości sił masowych i przy różnej średnicy kropel. Wykazano zgodność wyników uzyskanych za pomocą modeli numerycznych z wartościami wynikającymi z zależności teoretycznych. Stwierdzono również różny przebieg procesów śmietankowania i koalescencji w zależności od warunków przepływu.
Coalescence and creaming of emulsions were investigated numerically. Numerical models of two-phase systems containing regularly distributed droplets of dispersed phase were created. Numerical simulation of flow and behavior of those systems of droplets were performed for different values of body forces and for different droplet diameter. It was proved that the numerical models were compatible with the theoretical equations. A different course of coalescence and creaming process was observed depending on flow conditions.
Źródło:
Inżynieria i Aparatura Chemiczna; 2011, 1; 41-42
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Built-in Electric Field on Forbidden Transitions in In_xGa$\text{}_{1-x}$As/GaAs Double Quantum Well by Three-Beam Photoreflectance
Autorzy:
Sęk, G.
Ryczko, K.
Misiewicz, J.
Bayer, M.
Wang, T.
Forchel, A.
Powiązania:
https://bibliotekanauki.pl/articles/2028844.pdf
Data publikacji:
2001-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.-r
78.66.-w
Opis:
Photoreflectance spectroscopy has been used to study optical transitions in In$\text{}_{0.045}$Ga$\text{}_{0.955}$As/GaAs double quantum well at 80 K. The derivative nature of this contactless electromodulation technique allows for the observation of excited state transitions in the low-dimensional structure including the symmetry-forbidden ones. Excitonic symmetry-forbidden transitions can be observed due to the effect of mixing of heavy and light hole excitons and/or due to some asymmetry in the structure. We have shown that the built-in electric field in the region of double quantum well is weak enough (less than 0.5 kV/cm) not to cause any significant energetic shift of features due to quantum confined Stark effect, on one hand. On the other hand, it is sufficient to change strongly the oscillator strength of forbidden transitions. To change the internal electric field, we have used photoreflectance in the three-beam mode with a third beam continuously illuminating the sample and causing changes of the built-in electric fields due to the photovoltage effect. This method works as a contactless forward bias and allows for a change of the field down to the flat band conditions. We have shown that changes of built-in electric field by amount of a few tenths of kV/cm can modify the intensity of forbidden transitions significantly. We show that, although the mixing of excitons is still important, a very weak built-in electric field can be dominant in the observation of forbidden excitonic transitions in double quantum well.
Źródło:
Acta Physica Polonica A; 2001, 100, 3; 417-424
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Doctor Honoris Causa of the Adam Mickiewicz University for Professor Brian C. J. Moore
Doktor Honoris Causa Uniwersytetu Adama Mickiewicza dla prof. Briana C. J. Moore’a
Autorzy:
Sęk, A.
Powiązania:
https://bibliotekanauki.pl/articles/177129.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Brian Cecil Joseph Moore
Opis:
On November 9th, a.d. 2015, Professor Brian Cecil Joseph Moore from Cambridge University (UK), received the title of Doctor Honoris Causa of Adam Mickiewicz University from the hands of His Magnificence, the Rector of the AMU. Professor Brian Moore is a great scholar with a broad, in-depth knowledge and extremely wide research interests in many areas that go far beyond the mainstream of his research. He is a physicist, an acoustician and a psychologist.
Źródło:
Archives of Acoustics; 2016, 41, 2; 351-354
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frequency Discrimination for Amplitude Modulated Sinusoidal Signals at High Carrier Frequencies
Autorzy:
Sęk, A.
Kordus, M.
Powiązania:
https://bibliotekanauki.pl/articles/1359956.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.66.Fe
43.66.Hg
Opis:
The current study is a continuation of experiments presented by Sęk and Bukała (Acta Physica Polonica A 123, 1106 (2013)). The purpose of the present study was to investigate frequency discrimination of amplitude modulated high frequency carriers. Using 2AFC procedure, the subjects were presented with two observation intervals of which the first interval contained four pulses of the same high frequency signal (called SSSS), while in the second interval (called SHSH) the second and fourth pulses had higher frequencies values (i.e. shifted upwards by Δ f). The carrier frequency (in S pulses) was fixed and equal to 10 kHz. Modulation rates were equal to 100, 200, 337, 500, 600, 733, and 800 Hz. The value of the modulation rate was limited to keep all components of the sinusoidal modulation within one auditory filter (17% of the center frequency) centered at the carrier frequency. Two different types of modulation were used: a simple sinusoidal modulation with the modulation depth m set to 100%, and a logarithmic modulation with the modulation depth m set to 50 dB. Results indicate a strong relationship between frequency discrimination threshold and modulation type. The thresholds are significantly higher for logarithmic modulation in comparison to sinusoidal modulation. Amplitude modulation as well as logarithmic modulation applied to the high frequency carrier cause significant increase in the frequency discrimination threshold. For high frequency sinusoidal signal carriers (i.e. close to 10 kHz), frequency discrimination thresholds do not depend on amplitude modulation rates up to about 800 Hz. In general, the excitation pattern mechanism was a primary cue enabling frequency discrimination of modulated and unmodulated signals to compare with the mechanism based on the temporal fine structure. However, the excitation pattern was not the only mechanism responsible for the frequency discrimination.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-149-A-154
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Use of the Phase Locking Information in the Human Auditory System for Frequencies Above 5 kHz
Autorzy:
Sęk, A.
Bukała, M.
Powiązania:
https://bibliotekanauki.pl/articles/1400102.pdf
Data publikacji:
2013-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.66.Fe
43.66.Hg
Opis:
Accurate allocation of neural impulses to the same phase (i.e. phase locking) in the auditory system, ceases for frequencies above 5 kHz. However, some recent works suggest that it may have a much higher value. A discrimination of harmonic complex and inharmonic complex sound, formed using sound harmonic complex, in which all components were shifted towards higher frequency by the same number in hertzs, was analyzed. Fundamental frequency was $F_0$=1 kHz and signals were bandpass filtered by a fixed filter center frequency of which was $11F_0$ and bandwidth $5F_0$. Discrimination threshold was $\Delta F=0.089F_0$ for 10 normal-hearing subjects. However, replacing the sinusoidal components with the noise bands brought about a significant increase in thresholds. The largest increase was observed for 700 Hz bandwidth. The replacement of sinusoidal components with noisebands reduces information conveyed by phase locking. The differences in excitation pattern for harmonic complex and inharmonic complex signals, for the average threshold, did not exceed 0.7 dB. Therefore they could not be a useful cue for harmonic complex and inharmonic complex discrimination. A simplified model of phase locking showed that the substitution of sinusoids with bands of noise significantly reduced number of intervals between successive neural spikes corresponding to the virtual pitch of harmonic complex and inharmonic complex sounds. This degradation of discrimination suggests that the main source of information about the pitch of harmonic complex and inharmonic complex, especially for sinusoidal components, was the phase locking.
Źródło:
Acta Physica Polonica A; 2013, 123, 6; 1106-1113
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure of Elongated $In_{0.3}Ga_{0.7}As//GaAs$ Quantum Dots
Autorzy:
Pieczarka, M.
Musiał, A.
Podemski, P.
Sęk, G.
Misiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1399091.pdf
Data publikacji:
2013-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Hc
73.21.La
73.22.-f
Opis:
In this contribution the electronic structure of large $In_{0.3}Ga_{0.7}As//GaAs$ quantum dots is studied theoretically by means of 8 band k · p modeling. These quantum dots constitute unique physical system due to the low strain limit of the Stranski-Krastanow growth mode resulting in relatively large physical volume and elongation of the quantum dots in [1-10] direction. As a result of these critical growth conditions the electronic structure is expected to be very sensitive to the nanostructure size, shape, and composition of the quantum dot as well as the accompanying wetting layer. Another peculiarity of investigated system is the confining potential which is rather shallow and weakened in comparison to standard quantum dots. It makes them very interesting in view of both fundamental study and potential applications. To reveal physical mechanisms determining the optical properties of the investigated system, the electronic structure, mainly the number of confined states, and the wave function extension as a function of both quantum dot size and geometry have been simulated numerically and the importance of electron-hole Coulomb interactions has been evaluated.
Źródło:
Acta Physica Polonica A; 2013, 124, 5; 809-812
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy Transfer Processes in InAs/GaAs Quantum Dot Bilayer Structure
Autorzy:
Pieczarka, M.
Maryński, A.
Podemski, P.
Misiewicz, J.
Spencer, P.
Murray, R.
Sęk, G.
Powiązania:
https://bibliotekanauki.pl/articles/1185237.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Hc
71.35.-y
78.55.-m
Opis:
We investigate double layer InAs/GaAs quantum dots grown in the Stransky-Krastanov mode by molecular beam epitaxy. The sample consists of two layers of InAs quantum dots separated by 10 nm thick GaAs layer, where the top quantum dot layer of an improved homogeneity is covered by an InGaAs cap. This configuration has allowed for the extension of the dots' emission to longer wavelengths. We probed the carrier transfer between the states confined in a double quantum well composed of InGaAs cap and the quantum dots wetting layer to the states in the quantum dots by means of photoluminescence excitation and photoreflectance spectroscopies. Efficient emission from quantum dots excited at the double quantum well ground state energy was observed. There is also presented a discussion on the carrier injection efficiency from the capping layer to the quantum dots.
Źródło:
Acta Physica Polonica A; 2016, 129, 1a; A-59-A-61
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GaAs-Based Quantum Well Exciton-Polaritons beyond 1 μm
Autorzy:
Pieczarka, M.
Podemski, P.
Musiał, A.
Ryczko, K.
Sęk, G.
Misiewicz, J.
Langer, F.
Höfling, S.
Kamp, M.
Forchel, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399094.pdf
Data publikacji:
2013-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.-b
78.67.-n
78.67.Pt
Opis:
Realization of the Bose-Einstein condensate can provide a way for creation of an inversion-free coherent light emitter with ultra-low threshold power. The currently considered solutions provide polaritonic emitters in a spectral range far below 1 μm limiting their application potential. Hereby, we present optical studies of InGaAs/GaAs based quantum well in a cavity structure exhibiting polaritonic eigenmodes from 5 to 160 K at a record wavelength exceeding 1 μm. The obtained Rabi splitting of 7 meV was almost constant with temperature, and the resulting coupling constant is close to the calculated QW exciton binding energy. This indicates the very strong coupling conditions explaining the observation of polaritons at temperatures where the exciton dissociation is already expected, and allows predicting that room temperature polaritons could still be formed in this kind of a system.
Źródło:
Acta Physica Polonica A; 2013, 124, 5; 817-820
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical, Structural, and Electrical Properties of Aromatic Triphenylamine-Based Poly(azomethine)s in Thin Layers
Autorzy:
Palewicz, M.
Iwan, A.
Sikora, A.
Doskocz, J.
Strek, W.
Sek, D.
Mazurek, B.
Powiązania:
https://bibliotekanauki.pl/articles/1490096.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.Jd
73.61.Ph
78.66.Qn
Opis:
Spectroscopic and photophysical properties of the poly(azomethine)s with triphenylamine moieties were investigated by UV-vis, X-ray diffraction and atomic force microscopy methods. Current-voltage measurements were performed on ITO/polymer/$Alq_3$/Al, ITO/PEDOT/polymer:MWCNT/Al and ITO/polymer:MWCNT/Al devices. Multiwall carbon nanotubes were blended with polymer in the ratio 1:1. The lowest optical band gap value at 2.33 eV was detected. Moreover, an absorption coefficient α was calculated from transmission and reflectivity measurements. In this paper, we presented photophysical and structural properties of the poly(azomethine)s in solid state of great interest for the emerging field of molecular electronics and for their uses as active layers in (opto)electronic devices such as solar cells.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 439-444
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Trapping and Propagation of Nonresonantly Driven One-Dimensional Exciton-Polariton Condensate
Autorzy:
Opala, A.
Pieczarka, M.
Sęk, G.
Powiązania:
https://bibliotekanauki.pl/articles/1033879.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
67.85.De
71.36.+c
03.75.Kk
Opis:
We study theoretically a nonresonant optical creation of a one-dimensional exciton-polariton condensate in a semiconductor microcavity. The polariton condensate is treated in the mean-field approach, taking into consideration an antitrapping potential created by the reservoir of noncondensed particles. Polariton condensates are excited by multiple lasers, with a combination of continuous wave and pulsed sources. The proposed pump-probe configuration leads to the realisation of various experimental schemes, e.g. optical trapping of a polariton condensate in real space. Moreover, it can be utilised for investigation of elementary excitations in the time domain when polariton condensates from two sources interact with each other.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 401-404
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Photoluminescence from Epitaxial InGaAs/GaAs Quantum Dots with High Lateral Aspect Ratio
Autorzy:
Musiał, A.
Sęk, G.
Maryński, A.
Podemski, P.
Misiewicz, J.
Löffler, A.
Höfling, S.
Reitzenstein, S.
Reithmaier, J.
Forchel, A.
Powiązania:
https://bibliotekanauki.pl/articles/1492876.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Hc
65.80.-g
Opis:
Hereby, we present a study of a thermal quenching of emission from self-assembled epitaxial highly asymmetric quantum dots in InGaAs/GaAs material system for both ensemble and single dot regime. Pronounced interplay between the intensity of wetting layer and quantum dots originated emission was observed as the temperature was increased, evidencing a thermally activated energy transfer between the two parts of the system and an important role of the wetting layer in determining the optical properties of these anisotropic nanostructures. The carrier activation energies have been derived and possible carrier loss mechanisms have been analyzed. Single dot study revealed activation energies slightly varying from dot to dot due to size and shape distribution. The problem of the shape uniformity of individual quantum dot has also been addressed and possibility of additional carrier localization within the investigated structures has been found to be insignificant based on the recorded spectroscopic data.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 883-887
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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