Temat: 43.30.+m - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Reduction of Vibration of Fluid Loaded Plate with Piezoelectric Elements - a Comparison of Analytical, FEM Harmonic Analysis, and Real Results
Autorzy:: Iwański, D.
Wiciak, J.
Tematy:: 43.28.Js
43.30.-k
43.30.+m; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1400083.pdf Link otwiera się w nowym oknie
Opis:: In the present paper, a comparison of analytical calculations, FEM harmonic analysis, and real data from laboratory stand of fluid-loaded structure were taken under consideration. Resonant frequencies of the investigated structure were measured using swept sine technique on laboratory stand. Analytical calculations of the first twelve modes were made and the numerical model was build using the finite element method. Results from real data, analytical calculations, and numerical calculations are comparable.
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: A Simulation Research on Chaotic Behavior of Parabolic and Elliptic Underwater Acoustic Ray Equations
Autorzy:: Li, S
Li, X
Tematy:: 43.30.+m
05.45.Pq; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1400284.pdf Link otwiera się w nowym oknie
Opis:: The chaotic behavior of underwater ray system is studied. Because the parabolic equation is an approximation under small ray angle with respect to horizontal, the elliptic equation system is considered here besides the parabolic system. We pay main attention to the interval of large ray angle. A comparison between these two forms of system is performed. We find that when the ray angle is not large (θ_0=0° - 18°), the two systems show the same qualitative behavior. However, in interval of large ray angle (θ_0 ≥ 19°), if the perturbation strength is not very small, e.g. δ=0.05, the parabolic system shows regular motion, while the elliptic system exhibits chaotic behavior in most of this interval except a few quasiperiodic islands studded in the chaotic ocean. Dynamical behaviors of the two systems show surprising difference.
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Development of a 20 kJ Sparker for High Resolution Ocean Seismic Survey
Autorzy:: Sun, Y.
Gao, Y.
Yan, P.
Wang, J.
Yuan, W.
Wu, H.
Wang, Y.
Wan, P.
Zhao, G.
Tematy:: 52.80.Wq
43.30.+m; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1807914.pdf Link otwiera się w nowym oknie
Opis:: An ocean sparker with a stored energy of 20 kJ was developed for high resolution ocean seismic survey. The sparker is mainly composed of a high voltage high frequency charging supply, energy storage capacitors, a discharging switch and discharging electrodes. The H-bridge inverter and series resonant mode were adopted in the charging supply, and a dry high voltage transformer was used to improve the safety and maintenance, the average charging rate exceeded 4 kJ/s. An optical fiber connected between the high voltage system and the control system was used to isolate high voltage and transmit the high voltage signal. The high voltage electrodes of the discharging electrodes consisted of several hundreds of electrodes. The experimental results show that the sparker can be operated at repetition rates of 12 shots/min, and can meet the expected design requirements. Further field tests will be done in the near future.
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Realization of a Phase Noise Measurement Bench Using Cross Correlation and Double Optical Delay Line
Autorzy:: Salzenstein, P.
Cussey, J.
Jouvenceau, X.
Tavernier, H.
Larger, L.
Rubiola, E.
Sauvage, G.
Tematy:: 06.30.Ft
43.50.Yw
87.64.M-
87.57.cm; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2047892.pdf Link otwiera się w nowym oknie
Opis:: In this paper there are presented first results obtained with a phase noise measurement bench operating in X-band, realized in our laboratory, using double optical delay line and cross correlation. Phase noise floor using a microwave sapphire oscillator is better than -160 dB rad$\text{}^{2}$/Hz at 10 kHz from the 10 GHz carrier, using a 2 km optical delay line.
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Optical Mini-Disk Resonator Integrated into a Compact Optoelectronic Oscillator
Autorzy:: Salzenstein, P.
Tavernier, H.
Volyanskiy, K.
Kim, N.
Larger, L.
Rubiola, E.
Tematy:: 06.30.Ft
43.50.Yw
87.64.M-
87.57.cm; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1795637.pdf Link otwiera się w nowym oknie
Opis:: This work consists in the design, fabrication and characterization of mini-disk $MgF_{2}$ resonators for integration into optoelectronic oscillator and first experimental results of implementation in microwave free spectral range oscillator with taper coupling optoelectronic oscillator.
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 6.

Tytuł:: Measuring the Energy Landscape in Single Semiconductor Nanowires
Autorzy:: Smith, L.
Jackson, H.
Yarrison-Rice, J.
Jagadish, Ch.
Tematy:: 73.22.-f
73.43.Fj
73.50.Gr
73.50.Pz
73.63.-b
78.30.Fs
78.35.+c
78.55.-m
78.67.-n; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1419516.pdf Link otwiera się w nowym oknie
Opis:: With the ability to design and control the physical structure of nanostructures to tune their electronic properties, it is increasingly important to measure the electronic structure of single nanostructures. Here we describe a number of experimental techniques for measuring the electronic structure of single semiconductor nanowires. The advantages, disadvantages and limitations of these methods will be described.
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 7.

Tytuł:: Novel Route to Prepare Magnetic Material $Co_3V_2O_8$ and Structural Characterization
Autorzy:: Celik, G.
Kurtulus, F.
Guler, H.
Tematy:: 07.85.-m
32.30.Rj
33.20.Ea
61.43.Gt
61.66.Fn
65.40.-b
75.47.Lx
81.40.Gh
82.33.Pt
84.40.-x; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1491310.pdf Link otwiera się w nowym oknie
Opis:: $Co_3V_2O_8$ is a member of kagomé staircase oxides, represented by general formula $M_3V_2O_8$ (M = Ni, Co, Mn). It attracted great attention due to strong magnetic anisotropy, magnetic phase transition, genuine macroscopic quantum effects, strong quantum fluctuations, low-temperature ferroelectricity, field-induced magnetic transitions, complicated phase diagram and displays long-range magnetic order because of geometrical frustration. Different routes to prepare the frustrated magnetic material was reported such as floating zone technique and conventional high temperature method. $Co_3V_2O_8$ (International Centre for Diffraction Data (ICDD): 16-675) was synthesized with $Co_3O_4$ (ICDD: 80-1536) as binary phase by microwave assisted preparation using $Co(NO_3)_2 ·6H_2O$ and $NH_4VO_3$. The synthesized material was characterization by powder X-ray diffraction, the Fourier transform infrared spectroscopy, and thermogravimetric-differential thermal analysis.
Dostawca treści:: Biblioteka Nauki

Artykuł

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