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Wyświetlanie 1-15 z 19
Tytuł:
Galilean Transformation Expressed by the Dual Four-Component Numbers
Autorzy:
Majerník, V.
Powiązania:
https://bibliotekanauki.pl/articles/1933413.pdf
Data publikacji:
1995-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.10.Lh
02.10.Nj
Opis:
We express the special Galilean transformation in the algebraic ring of the dual four-component numbers.
Źródło:
Acta Physica Polonica A; 1995, 87, 6; 919-923
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Dual Reflector Antenna for Point-to-Point System Applications
Autorzy:
Olszewska, M.
Gwarek, W.
Powiązania:
https://bibliotekanauki.pl/articles/1505251.pdf
Data publikacji:
2011-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.20.-q
Opis:
In this paper design and realization of a dual reflector antenna for receiving internet signal in the point-to-point system is presented. Three different configurations of dual reflector antenna have been considered to obtain the antenna operating in 5.2-5.8 GHz band and having small dimensions. The results of computer simulations and measurements are shown. The design was based on electromagnetic simulations using QW-V2D package (an axisymmetrical version of finite-difference time-domain software). In measurements the method with a reference antenna was used. Additional discussion about using the main reflector of smaller diameter and decreasing spillover radiation was performed.
Źródło:
Acta Physica Polonica A; 2011, 119, 4; 558-562
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterizations for the Dual Split Quaternionic Curves
Autorzy:
Tuna Aksoy, A.
Çöken, A.
Powiązania:
https://bibliotekanauki.pl/articles/1031329.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.40.k
02.40.Hw
Opis:
We define harmonic curves and inclined curves for dual split quaternionic curves. And then, we give some characterizations for dual split quaternionic inclined curves by means of the harmonic curvatures.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 905-908
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Dual Quaternionic N̅₃ Slant Helices in D⁴
Autorzy:
Tuna Aksoy, A.
Çöken, A.
Powiązania:
https://bibliotekanauki.pl/articles/1031192.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.40.k
02.40.Hw
Opis:
In this paper, we define the harmonic curvature functions for dual quaternionic curves. Moreover, we also study some characterizations for dual quaternionic slant helices according to dual quaternionic frame.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 900-904
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dual-Frequency Plasma Enhanced Chemical Vapor Deposition of Diamond-Like Carbon Thin Films
Autorzy:
Jamshidi, R.
Hosseini, S.
Ahmadizadeh, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1419912.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Gh
Opis:
Dual-frequency plasma enhanced chemical vapor deposition was used to grow diamond-like carbon thin films from $CH_4,$ $H_2$ gas mixture. The effects of radio frequency, microwave power, and gas ratio were investigated. Various species have been identified in the $CH_4-H_2$ plasma using optical emission spectroscopy and their effects on film properties have been studied. Increasing the RF power to 400 W, the variation trend of refractive index and CH, $C_2$ intensity ratios change beyond the 300 W, but the growth rate shows the continuous increasing character from 6 to 11.6 nm/min. Increasing the hydrogen content in the system, the intensity ratio of CH, $C_2$, $CH^{+}$ and growth rate show decreasing tendency and the refractive index rises from 1.98 to 2.63. Adding MW produced plasma to the system grows the refractive index to 2.88 and growth rate to 10.8 nm/min. The water contact angle rises from 58.95° to 73.74° as the RF power increases to 300 W but begins to reduce until 400 W. In addition, the contact angle shows a growing tendency by increasing the hydrogen flow to the chamber. In addition, the structures of the films were investigated by the Raman spectroscopy.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 230-235
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical properties of BaCeO₃-based electrolytes for use in dual protonic ceramic-solid oxide fuel cells
Autorzy:
Gawel, R.
Przybylski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1055096.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
composites
electrolytes
ceramics
electrochemistry
Opis:
Bulk samples consisting of BaCe_{0.85}Y_{0.15}O_{3-δ} (BCY15) and Ce_{0.85}Y_{0.15}O_{2-δ} (YDC15) compounds, mixed together in different ratios, were studied as potential electrolytes in dual protonic ceramic-solid oxide fuel cells and compared with non-composite BCY15 and YDC15. The microstructures of the sintered materials indicate that BCY15 exhibits the largest grains, whereas composites have greater visible porosity than the non-composite samples. From X-ray diffraction studies it follows that BCY15 and YDC15 consist mainly of one phase, whereas the composites are two-phase materials. Electrochemical impedance spectroscopy studies at different temperatures show that the composite materials are capable of conduction the order of 10¯³ S/cm at temperatures above 500°C in a hydrogen-containing atmosphere. Furthermore, activation energy values of the conductivity determined for the composites in air atmosphere are between those obtained for BCY15 (E_{a}=0.590±0.017 eV) and YDC15 (E_{a}=1.132±0.008 eV). From this it follows that both phases of the composites influence the electrical conductivity of the materials. In conclusion, BCY15 and the BCY15-YDC15 composites show promise for future use as electrolytes in dual protonic ceramic-solid oxide fuel cells.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1361-1366
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Equivalence Ratio and Mean Piston Speed on Performance of an Irreversible Dual Cycle
Autorzy:
Ebrahimi, R.
Powiązania:
https://bibliotekanauki.pl/articles/1493377.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.70.Ln
82.60.Fa
88.05.-b
Opis:
In the present study, the performance of an air standard dual cycle is analyzed using finite-time thermodynamics. The relations between the power output and the compression ratio, between the power output and the thermal efficiency are derived by detailed numerical examples. The results show that the maximum power output and the power output at the maximum efficiency point increase and then decrease as the equivalence ratio and/or the mean piston speed increases. The results also show that the optimal compression ratio corresponding to maximum power output point and the working range of the cycle remain constant as the mean engine speed is increased, but they increase and then decrease as the equivalence ratio is increased. It is noteworthy that the results obtained in the present study are of significance for providing guidance with respect to the performance evaluation of practical internal combustion engines.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 384-389
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Analysis of a Dual Cycle Engine with Considerations of Pressure Ratio and Cut-Off Ratio
Autorzy:
Ebrahimi, R.
Powiązania:
https://bibliotekanauki.pl/articles/1535596.pdf
Data publikacji:
2010-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.70.Ln
82.60.Fa
88.05.-b
Opis:
The dual cycle is a better approximation to the modern high speed compression ignition engine than either the Diesel cycle or the Otto cycle. Therefore, this study is aimed at investigating the effects of pressure and cut-off ratios on the dual cycle performance with considerations of heat transfer loss, variable specific heat ratio and friction irreversible losses. By using finite-time thermodynamics theory, the relations between the power output and the compression ratio, between the thermal efficiency and the compression ratio, as well as the optimal relation between power output and the efficiency of the cycle are obtained. The results show that if compression ratio is smaller than certain value, the increase of pressure ratio and the decrease of cut-off ratio make the power output bigger. While if compression ratio exceeds certain value, the power output first increases and then starts to decline as pressure ratio and cut-off ratio are increased. With further increase in compression ratio, the power output decreases with increasing pressure ratio and decreasing cut-off ratio. The effects of pressure and cut-off ratios on the variation of the thermal efficiency with compression ratio are similar to those for the power output. The results obtained in this work can provide significant guidance for the performance evaluation and improvement of modern high speed compression ignition engines.
Źródło:
Acta Physica Polonica A; 2010, 118, 4; 534-539
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Press Ram Pulsation on Deep Drawability of Dual Phase Steel Sheet
Autorzy:
Olguner, S.
Tolga Bozdana, A.
Powiązania:
https://bibliotekanauki.pl/articles/1031199.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Hy
81.40.Lm
02.70.Dh
Opis:
A study of the influences of press ram pulsation on deep drawability of dual phase steel sheet is presented. General characteristics of deep drawing process, press ram pulsation technique and dual phase steels are briefly discussed. A finite element model is used to evaluate the influence of pulse motion profile of press ram on the thickness reduction of steel sheet and forming load. Commercial finite element software package DEFORM-3D is used for modelling and simulation of cylindrical cup drawing. The effects of superimposed low frequency vibrations of the press ram are investigated. Pulsation amplitudes of 0.5, 0.25, and 0.125 mm are created on the die with the corresponding pulsation frequencies of 5, 10, and 20 Hz. Finite element simulations are carried out using material model of dual phase (DP600) steel, that is one of the most widely used materials in automobile industry, in order to improve crash safety and fuel economy. Results obtained with press ram pulsation are compared with results for the conventional press ram motion and significant effect of proposed method is demonstrated.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 742-745
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical Properties of Fiber-Optic Sensor in New Dual Configuration
Autorzy:
Życzkowski, M.
Szustakowski, M.
Markowski, P.
Karol, M.
Powiązania:
https://bibliotekanauki.pl/articles/1418076.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.30.Wb
87.57.-s
42.79.Qx
Opis:
The main aim of the work is the integration of two different fiber-optic sensors: the Michelson interferometric sensor, the Mach-Zehnder interferometric, the Sagnac interferometric and modalmetric sensors. The proposed hybrid sensor is a classical interferometer whose measuring arm is upgraded with modalmetric sensor. The theme of research is to assess the impact of modalmetric sensor to interferometer and comparative assessment of detection capabilities of interferometric sensor, modalmetric sensor and hybrid sensor for different types of excitations. The described tests concern the area of basic researches. The results can be used in the construction sensors with corresponding characteristics and properties to the appropriate applications.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 938-941
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dual Role of TiN Reaction Barrier in Gold Based Metallization to GaAs
Autorzy:
Piotrowska, A.
Kamińska, E.
Guziewicz, M.
Adamczewska, J.
Kwiatkowski, S.
Turos, A.
Powiązania:
https://bibliotekanauki.pl/articles/1923915.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Ns
Opis:
Reactively sputtered TiN films were evaluated as annealing cap improving the formation of Au(Zn) ohmic contact and as antidiffusion barrier protecting contact metallization and underlying GaAs against reaction with Au overlayers.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 857-860
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of Passively Synchronized Dual Wavelength Q-Switched rm $Nd^{3+}:YVO_4$ Lasers
Autorzy:
Abdul Ghani, B.
Hammadi, M.
Powiązania:
https://bibliotekanauki.pl/articles/1419741.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.55.Rz
42.60.Gd
87.19.lm
Opis:
A mathematical model describing the sum frequency generation of passively synchronized Q-switched pulses simultaneously emitted from two separate $Nd^{3+}:YVO_4$ lasers has been demonstrated. This model describes the temporal behavior of the output pulses, and studies the impact of the pumping energy variation on the characteristics of these pulses (output power, pulse separation, pulse widths, delay time). $V^{3+}:YAG$ and $Cr^{4+}:YAG$ saturable absorbers and a periodically poled KTP crystal are used to achieve and improve the synchronization of the emitted 1342 nm and 1064 nm wavelengths. The synchronization process generates pulsed yellow light with 593.5 nm wavelength, and it can be realized through adjusting the pumping energy of the gain media.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 103-108
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Properties of Compounds Creating Dual-Frequency Nematic Liquid Crystals
Autorzy:
Mrukiewicz, M.
Perkowski, P.
Garbat, K.
Dąbrowski, R.
Parka, J.
Powiązania:
https://bibliotekanauki.pl/articles/1399014.pdf
Data publikacji:
2013-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.Gm
77.84.Nh
61.30.-v
Opis:
In this paper we report how dielectric spectroscopy can help in creating of dual-frequency nematic liquid crystals. Dual-frequency nematic liquid crystals is new class of liquid crystal materials. Such mixture is usually formed by a combination of many components (even more than 10), which can be split into two groups: molecules having large transverse dipole moment and molecules with a large longitudinal dipole moment. The behavior of a base (parent) mixture, functional admixtures and final dual-frequency nematic liquid crystals mixture is investigated by dielectric spectroscopy in wide frequency (100 Hz-10 MHz) and temperature ranges. This allows us to find out why the dual-frequency liquid crystal has an important feature: positive and negative dielectric anisotropy at different frequencies. We present parameters of molecular motions around short (S-mode) and long (L-mode) molecular axes observed in investigated materials and discuss how the creation of final dual-frequency nematic liquid crystals mixture can modify molecular relaxations.
Źródło:
Acta Physica Polonica A; 2013, 124, 6; 940-945
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frequency Variation of Complex Permeability in Dual Ferrite Filler - Single Polymeric Matrix Composites
Autorzy:
Dosoudil, R.
Ušáková, M.
Sláma, J.
Grusková, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813959.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Tm
75.50.Gg
76.50.+g
Opis:
The frequency dependences of complex initial permeability for triple-component composite materials based on two different types of ferrite filler (MnZn and NiZn ferrite) and a nonmagnetic polymeric matrix (PVC) were studied in the frequency range of 10 kHz-1 GHz. The frequency dispersion of permeability is discussed by means of a dynamic model based on the superposition of the two types of magnetic resonance, the resonance of vibrating domain walls and the resonance of precessing magnetic moments in domains.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 621-624
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mode-Locked Dual-Wavelength Heterolasers for Terahertz Generation via Intracavity Wave Mixing
Autorzy:
Belyanin, A.
Kocharovsky, V.
Kocharovsky, Vl.
Kukushkin, V.
Andrianov, A.
Aleshkin, V.
Dubinov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813202.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.55.Px
42.65.Ky
Opis:
It is shown that the mid/far-infrared (IR) and THz pulse generation via intracavity difference-frequency mixing in quantum-well dual-wavelength heterolasers can be rather efficient under mode-locking regime for one or both lasing fields even at room temperature. In a simple model we derive an explicit formula for intensity of the generated IR or THz pulse and find that this method is capable of producing picosecond pulses at ≈1 GHz repetition rate with the peak power of the order of 1 W and ≤ 0.2 mW at 10 μm and 50 μm wavelengths, respectively.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 869-873
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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