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Wyświetlanie 1-15 z 23
Tytuł:
Optical Nonlinearities in PbSe Nanocrystals
Autorzy:
Aleksejenko, G.
Pačebutas, V.
Krotkus, A.
Powiązania:
https://bibliotekanauki.pl/articles/1179709.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Jg
42.70.Mp
42.65.Re
Opis:
The linear and nonlinear optical response of colloidal PbSe nanocrystals was investigated. Optical nonlinearity and its recovery dynamics in this system was measured and compared with other available experimental data. The saturation irradiance value for the bleaching effect and absorption cross-section were determined.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 294-297
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Advanced Particle Swarm Optimization Algorithm for MPPTs in PV Systems
Autorzy:
Erdem, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1031910.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.55.de
88.40.mp
87.55.kd
Opis:
Maximum power point trackers are in charge of absorbing the maximum potential power from the photovoltaic panels. Thus, this makes the maximum power point trackers the fundamental parts of the photovoltaic panel systems. The conventional maximum power point tracker algorithms are working well under balanced insolation conditions, however when the partial shade condition occurs, those algorithms are trapped at the local maxima. Hence, under partial shade conditions, the need for a global maximum power point tracking algorithm arises. Particle swarm optimization is a preferential algorithm of maximum power point trackers in literature, especially in partial shade conditions. This paper is focused on improving the existing particle swarm optimization algorithm for maximum power point trackers. The proposed advanced particle swarm optimization algorithm aims to catch the global maximum power point much faster, accurately and to reduce the chatter in the power curve. The proposed method accelerates the global maximum tracking time with gridding the initial search area. The effectiveness of the proposed method is demonstrated with simulation results and these results are compared with a conventional particle swarm optimization method under step changes in irradiance and partial shade conditions of an array of photovoltaic panels.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 1134-1139
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A DFT Study on (001) Thin Slabs of $SrTiO_3$ and $BaTiO_3$
Autorzy:
Mahmoodi, T.
Powiązania:
https://bibliotekanauki.pl/articles/1400503.pdf
Data publikacji:
2015-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.A-
31.15.E-
82.45.Mp
Opis:
In this paper, we studied the relaxation of (001) surface of $BaTiO_3$ and $SrTiO_3$ slabs with two termination surfaces and with 3, 5, and 7 layers thickness for each cases, using density functional theory and generalized gradient approximation for exchange-correlation functional and pseudo potential method. We calculated the slab energy and the rate of expansion and contraction of the layers and compare them for different thicknesses. Band structure and density of states for these slabs and for $BaTiO_3$ and $SrTiO_3$ bulk were computed to find out the variation of band gap with respect to slab thickness. It is found that in comparison with bulk, in $TiO_2$ slabs of both materials gap size decreases while in SrO and BaO slabs it increases.
Źródło:
Acta Physica Polonica A; 2015, 127, 6; 1616-1620
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Heterogeneous Reverse Osmosis Membranes Based Separation of Fluorides with Fly Ash Pretreatment
Autorzy:
Thaçi, B.
Gashi, S.
Powiązania:
https://bibliotekanauki.pl/articles/1402534.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.45.Mp
89.30.ag
89.60.-k
Opis:
The objective of this paper was to examine the separation efficiency of fluorides by heterogeneous reverse osmosis membranes made from cellulose acetate and modified coal with aryl diazonium salt (batch 318 K) and lignite based fly ash pretreatment. The effect of varying the feed concentration (400-100 mg/dm³) of sodium and ammonium fluorides on performances of these membranes using 400 mg/dm³ aqueous solution of sodium chloride as referent system at 1.76 MPa have been investigated. Practically no significant change in the membrane characteristics (product rate, and solute separation) by varying the above concentration of feed salt solutions. The high separation of fluoride (synthetic sample) ≈99% was obtained by resulting membranes pretreated with different amount and contact time of low cost adsorbent (fly ash) at pH 4. A sample of waste water effluents of cement industry was also treated with above membranes without pretreatment and the results are presented. These data indicate that the fluoride ion concentration are within acceptable level as far as environmental limits concerned, therefore, their practical application produced water of suitable quality, essentially free from fluorides.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-62-B-66
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics and Electrochemical Performance of $TiO_2$:MWCNT Nanocomposite Anodes for Li-Ion Batteries
Autorzy:
Guler, M.
Cetinkaya, T.
Cevher, O.
Tocoglu, U.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1218684.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.45.Mp
61.48.De
Opis:
In this study, highly porous buckypapers were manufactured via vacuum filtration techniques and nanocrystalline $TiO_2$ thin films were deposited on buckypapers using reactive radio frequency magnetron sputtering to understand the role of the deposition power. In addition, the effects of the deposition parameters on the electrochemical properties as an anode electrode for Li-ion batteries have also been studied.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 322-324
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Titanium Dioxide Based Nanocomposite Anodes for Li-Ion Batteries
Autorzy:
Oguz Guler, M.
Cevher, O.
Tocoglu, U.
Cetinkaya, T.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399946.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.48.De
82.45.Mp
82.47.-a
Opis:
Carbon nanotube thin sheets - buckypapers - were prepared from multi-walled carbon nanotubes oxidized with different oxidation agents. Titanium dioxide films were then deposited by thermal evaporation of Ti films on buckypapers substrates followed by in situ dc plasma oxidation. The effect of oxidation power on the structural, compositional and electrochemical properties of the films was investigated.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 390-392
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Highly Nonlinear Multi-Material Chalcogenide Spiral Photonic Crystal Fiber for Supercontinuum Generation
Autorzy:
Kalra, Shruti
Vyas, Sandeep
Tiwari, Manish
Buryy, O.
Singh, Ghanshyam
Powiązania:
https://bibliotekanauki.pl/articles/1031019.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Mp
42.81.Pa
78.20.Ci
Opis:
In this paper, we have numerically simulated a highly nonlinear multi-material chalcogenide photonic crystal fiber in order to investigate both the linear and the nonlinear parameters for generating a supercontinuum. The photonic crystal fiber is designed with borosilicate and As₂S₃ glass, where borosilicate is doped in a spiral shape in the cladding region of the fiber. The designed fiber was carefully anlaysed for the parameters, effective refractive index, effective mode area, dispersion and nonlinearity coefficient. The estimated parameters are found satisfactory and suitable for further simulation and investigation of the design for broadband supercontinuum generation.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 1000-1002
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the effects of moving targets on hit force in Taekwondo
Autorzy:
Kumartaşli, M.
Üncü, İ.
Çatikkaş, F.
Akyüz, M.
Kılım, O.
Powiązania:
https://bibliotekanauki.pl/articles/1068591.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Rm
07.07.Mp
07.10.-h
Opis:
The system to be developed has been designed in order to determine the training levels of the athletes in the field of taekwondo at national and international level and to follow-up the talent development process using computer support. The progression and continuity of hit power and time-dependent performance improvement of an athlete can be measured with interactive impact measurement system. The system determines a random target. It marks the target by blue light. When the light turns on, the athlete reacts accordingly and swiftly by kicking without knowing the light timing. The athlete only needs to know where the light is. Unlike in other training systems, the piston has been able to go back and forth in response to the strike of the athlete by means of a moving hydraulic system. The athlete can be pushed back by opening the piston when his/her performance drops down. The piston strike model is deactivated when the performance of the athlete is above a given threshold value. There will be four operating phases in the mechanism depending on the impact speed of the piston. Moving target robotic system analyses various hits in Taekwondo with the aim to determine hit force and reaction time. After completion of the warming up at the first stage, the athlete will be able to increase the workout level from low to high levels and will try to keep the mechanism behind as much as possible. Moreover, the athlete will be able to compare his/her results with results of others. Using this system, the efficiency of athletes can be easily determined and deficiencies can be resolved.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 382-384
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of LiNbO₃-Ag Nanocomposites
Autorzy:
Bolesta, I.
Vakiv, M.
Haiduchok, V.
Kushnir, O.
Demchuk, A.
Nastyshyn, S.
Gamernyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/1030943.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ps
71.45.Gm
81.40.-z
42.70.Mp
Opis:
The article presents the experimental results of the investigation of the absorption spectra and nonlinear refraction of the metal-dielectric nanocomposite that contains the lithium niobate pyroelectric crystal coated with the silver nanofilms on its surface. The atomic force microscopy surface research of these crystals with and without films are also provided. The nanowidth silver films impact on optical spectra and nonlinear refraction of LiNbO₃-Ag nanocomposite was analyzed depending on the sign of the side charge of the crystal, that contain nanofilms.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 860-863
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Antimony Doped Tin Oxide Nanocomposites for Li-Ion Batteries
Autorzy:
Guler, M.
Cevher, O.
Tocoglu, U.
Cetinkaya, T.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399942.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.48.De
82.45.Mp
82.47.-a
Opis:
High content carbon nanotubes mats have been produced to multi-walled carbon nanotubes. Sb doped $SnO_2$ films were then deposited by rf magnetron sputtering on buckypapers substrates. The effect of oxidation pressure on the structural, compositional, and electrochemical properties of the films was investigated.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 383-385
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of a Mutual Capacitance οf SAW Periodic Strips Having Different Metallization Ratio
Autorzy:
Kawalec, A.
Powiązania:
https://bibliotekanauki.pl/articles/1811552.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.Hm
02.60.-x
07.07.Mp
43.60.+d
77.65.Dq
Opis:
The analytical expression for mutual capacitance of periodic strips is presented in this paper. This expression utilizing the spectral theory is obtained. It is studied how the metallization ratio affects a mutual capacitance of periodic strips. The mutual capacitance of periodic strips as a function of metallization ratio, for split electrodes, was shown in the paper. This approach should be applicable to modeling of the surface acoustic waves interdigital transducers.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-139-A-142
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Studies of C-Ni-Pd Nanocomposite Films Deposited on Al₂O₃ Substrate
Autorzy:
Kozłowski, M.
Czerwosz, E.
Sobczak, K.
Kurowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1032987.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.23.Pq
81.07.Bc
81.15.Gh
82.45.Mp
Opis:
The properties of nanocomposite carbon-nickel-palladium (C-Ni-Pd) films deposited on Al₂O₃ substrate have been investigated and the results are presented in this work. C-Ni-Pd films were obtained by a 3 step process consisting of PVD/CVD/PVD methods. The structure and morphology of the obtained films were characterized by scanning electron microscopy and transmission electron microscopy techniques at various stages of film formation. Energy dispersive X-ray spectrometer was used for measuring the elements segregation in the obtained film. Transmission electron microscopy and scanning transmission electron microscopy observations have shown carbon nanotubes decorated with palladium nanoparticles in the final film. The average size of the palladium nanoparticles did not exceed 10 nm.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1409-1412
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystal structure of the high temperature phase of strontium barium niobate
Autorzy:
Paszkowski, R.
Zubko, M.
Wokulska, K.
Kusz, J.
Dec, J.
Powiązania:
https://bibliotekanauki.pl/articles/1058111.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Mp
77.84.Dy
61.50.-f
71.55.Jv
Opis:
Pure and undoped strontium-barium niobate Sr_{0.40}Ba_{0.60}Nb₂O₆ (SBN40) single crystals grown by the Czochralski method were investigated by single crystal X-ray diffraction methods. The study below T_{C} (429 K for SBN40) confirmed the structure with P4bm space group. Above this temperature the structure transforms into the paraelectric, centrosymmetric one with P4/mbm space group. Analysis of the recorded diffraction patterns allowed to observe several signs of crystal structure modulation. On the registered diffraction images satellite reflections were found. A modulation vector q=(δ,±δ,), where δ=0.3075(6) (at room temperature) was found and it was similar to that occurring in the SBN61. In addition, above the phase transition temperature on the (hk) planes with l integer a weak diffuse scattering was observed.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 856-858
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Second Harmonic Generation in AlGaAs Nanowaveguides
Autorzy:
Rutkowska, K.
Duchesne, D.
Volatier, M.
Arès, R.
Aimez, V.
Morandotti, R.
Powiązania:
https://bibliotekanauki.pl/articles/1493258.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.82.Et
42.65.Ky
42.79.Nv
42.70.Mp
78.67.Uh
Opis:
In this paper, we investigate semiconductor nanowaveguides (i.e. ridge waveguides with core-widths narrower than 1 μm) intended to act as novel optical light sources through nonlinear wavelength/frequency conversion. In particular, numerical calculations have been performed in order to design suitable photonic devices (fabricated in the AlGaAs/GaAs platform) capable of high efficiency second harmonic generation. Particular interest has been dedicated to the effective conversion of optical signals from 1520-1600 nm (the third telecom window) down to 760-800 nm. We demonstrate that the output wavelength (resulting from modal phase-matching) can be dynamically tuned by proper adjustment of the temperature and/or geometrical parameters of the waveguides. In addition, by changing the waveguide width it is also possible to modify the device dispersion characteristics, giving the possibility to work in the region of anomalous dispersion and thus allowing for the generation of temporal solitons.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 725-731
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Third-Order Nonlinear Optical Properties and Reverse Saturable Absorption in 2,3-Butanedione Dihydrazone Using z-Scan Technique
Autorzy:
Singh, V.
Aghamkar, P.
Lal, B.
Powiązania:
https://bibliotekanauki.pl/articles/1400281.pdf
Data publikacji:
2013-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.-k
42.70.Mp
42.70.Nq
Opis:
Using chemical route a 2,3-butanedione dihydrazone (BDDH) compound was prepared. The third-order nonlinear optical properties of BDDH were investigated by using single beam z-scan technique with Q-switched, frequency doubled Nd:YAG laser (λ = 532 nm) at 5 ns pulse. Effect of excitation intensity on nonlinear optical properties has been studied and found that experimental and computed values are well in agreement. Also, we found the measured nonlinear optical coefficients are nearly ten times larger than the reported. The excited state absorption cross-section of BDDH was found to be larger than that of the ground state absorption cross-section, indicating the reverse saturable absorption.
Źródło:
Acta Physica Polonica A; 2013, 123, 1; 39-44
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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