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Graphitic carbon nitride (g-CN) based materials have been regarded as a novel class of multifunctional nanoplatforms for electronic, catalytic and energy applications. However, its optical characteristics have not received enough attention, yet. Although the theoretical bandgap of g-CN is quite large, which seriously limits the optical response range, various efficient strategies have been proposed...
Ultrafast 2μm lasers are capturing a growing interest for the use as pump and seed sources in optical parametric systems operating in the mid-IR, for IR super-continuum generation, and for time-resolved spectroscopy. However, the demonstration of solid-state ultrashort 2 μm laser based on passive mode-locking lacks behind similar developments with established gain media, at 1 μm for example, partially...
In the clustering of key points, the ratio of inter-class distance and intra-class distance is enlarged using Normalized SIFT vectors. In order to significantly make the ratio larger, a new normalization method is proposed, which is termed the ¡®normalization method based on seedpoints'. In image preprocessing, for the removal of the object background, a SIFT-based entropy method is given, while the...
The laser efficiency is an important parameter, and we pay more attention to the maximum conversion efficiency of a laser in many cases. By taking into account the single-photon absorption (SPA) and two-photon absorption (TPA) processes of GaAs, the Gaussian spatial distributions of the intracavity photon density and the initial population-inversion density, and the pumping and the spontaneous emission...
Besides accelerating graphics rendering, GPU is also applied to high performance computing in non-graphics application field. For complex multivariate function on GPU, texture look-up method is proposed to enhance computational efficiency. Reconstruct the complex multivariate function to several two-variable functions and then map them to different 2D textures. When real-time running, one texture...
Aimed at these shorts of the unity expert system in rotate machine fault diagnosis, a new method of neural network interfused with traditional expert system is presented in rotate machine fault diagnosis. The frame and function expression of rotate machine fault diagnosis system based on neural network and traditional expert system are given. The select method of diagnosis parameter and the setting...
Smooth Particle Hydrodynamics (SPH) is an accurate method in fluid numerical simulation. In this paper we introduce a calculating algorithm based on the SPH, and propose an interactive method to simulate fluids with free surfaces. This method is completely consistent with the dynamic behavior of a viscous fluid, namely described by Navier-Stokes equations. In addition, for online simulation, we adopt...
We introduce a composite method for simulation and rendering of breaking waves in computer graphics applications. The method generated not only a simple wave belt like previous work, but also a manipulative model by influence of the wind. The particle system we adopted combine POINT primitive as basic particle and fat particle as characteristics particle are well suited for simulate all kinds of spray...
L-systems, IFS and fractal method are widely used to model trees, but the created trees are of great similarity and unable to embody the characteristic of different trees well. To overcome the above drawback, a new modeling method for trees is presented and expounded based on stochastic space point. Through specifying the branching type, the proposed modeling method will create relevant bifurcate...
After analyzing low light level (LLL) imaging and its noise characteristics in detail,the simulative model of LLL imaging is described. We use digital real-time calculate technique and realize the LLL scene computation model. Based on the proposed model and utilizing the parallelism and programmability of graphic processing unit (GPU), we proposed a method to solve the real-time simulation problem...
Simulation of trees based on synthetic characteristics is one of the hotspots in computer graphics. After thoroughly investigating the principle of L-system, we propose a thought----modeling trees based on synthetic characteristics with L-system. Detailed three-step method how to model trees with L-system is brought forward. The modeling process based on synthetic characteristics is circumstantiated:...
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