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Wyszukiwanie w czasie rzeczywistym – sposób na zwiększenie widoczności zasobów bibliotek cyfrowych w wyszukiwarkach internetowych
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Kolekcja starych druków hebrajskich w zbiorach Żydowskiego Instytutut Historycznego
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Digital Libraries and Digital Preservation
Get PDFPrezentacja z 20th Annual EINIRAS Conference "From Content to Knowledge in International Relations
No full textPoznańIn this article the stable process of the optical tweezer using the pulsed counter-propagating Gaussian beams is investigated using the Langevin equation with optical gradient force. The influence of parameters as the total energy, the beam waist, the radius of particle and the viscosity of fluid on the dimension of the stable space-time “pillar” is simulated and discussed
No full textPoznańThe resonator transients and, in particular, the phenomenon of relaxation oscillations of diode end-pumped solid-state Cr:LiSAF and Nd:YVO4 lasers have been investigated at 850 nm and 1064 nm, respectively. The obtained results allow to understand clearly the resonator transients and show a generation of single laser pulses from the Cr:LiSAF and Nd:YVO4 lasers at near-threshold pumping levels. By proper choices of solid-state laser resonator and pumping parameters, obtainable duration of single solid-state laser pulses is computationally studied to be in nanosecond range and much shorter than the diode laser pumping pulse (100 μs). As a result, a technique of single short laser pulse generation at high repetition rate of diode pumping pulses has been experimentally demonstrated. In our Nd:YVO4 laser pumped by 100 μs diode laser pulse, single laser pulses as short as 93 ns at 1064 nm and pulse repetition rate as high as 3 kHz has been produced. The superior limit (about 3 kHz) in repetition rate of single Nd:YVO4 laser pulse mainly resulted from the fluorescence lifetime of active ion Nd3+
No full textPoznańUsing semiconductor saturable absorber mirror and diode end-pumping configurations, all solid-state passively mode-locked Nd3+:YVO4 lasers have been successfully developed. The lasers efficiently provide a stable train of ultra-short laser pulses of 12 ps at 1064 nm at the pulse repetition rate adjustable from 8.8 MHz to 100 MHz. The peak power of 1.3 kW and an average laser power of 940 mW were obtained at the pulse repetitive rate of 60 MHz, corresponding to a laser conversion efficiency of 43%. In order to obtain lower pulse repetitive rate and, therefore, higher peak power, a long laser resonator (larger than 15 m) is proposed and successfully developed for diode end-pumped passively mode-locked laser operation using a simple multiple-pass cavity configuration. As a result, the peak laser power up to 5.1 kW was obtained at the pulse repetitive rate of 8.8 MHz. The experimental results of the picosecond laser amplification and the harmonic generations at 532 nm (2nd), 355 nm (3rd) and 266 nm (4th) are presented
No full textPoznańA predictive description of the synthetic processes leading to complex macromolecules requires consideration of the spatial models. Hierarchical, structural and dynamic complexities of such systems require new methodological developments. The presented work provides effective tools for the modelling of the complex synthetic processes in the 3D space under controlled conditions. We propose constructing a parallel computing system which realizes the 3D architecture and the cooperative dynamics based on the dynamic lattice liquid (DLL) model. This can create new standards in the spatial resolution of the models allowing simulations of the systems comparable in sizes and complexity with the biological cells in the future