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In the field of the fabrication of micro- and nano-spheres, the phenomenon of Plateau-Rayleigh instability has drawn more and more attention. This surface tension-driven instability in two immiscible fluids can be used to generate uniformly size micro- and nano-spheres by imposing an external mechanical excitation. In this article, we mainly adopt numerical simulation method to study the effects of...
Panoramic stereo spherical vision system can simultaneously realize panoramic stitching and three-dimensional ranging. Its multi-channel image acquisition system is located in 3D space through the mechanical encapsulation. In this paper, an effective calibration method is explored to solve the problem of slight errors generated by the encapsulation structure installation and manufacturing. More importantly,...
This paper presents the hardware system scheme of multi-channel image processing based on DSP, with DSP as the core control of FPGA and CMOS, responsible for the overall scheduling system, using FPGA as coprocessor responsible for the collection of the original image information from CMOS. This paper combines the fisheye lens to obtain the complete original image for panoramic vision and stereo vision...
The kernel of stereo vision system is stereo matching. In this paper proposed, an efficient image matching algorithm based on Speed Up Robust Features (SURF). Compared with traditional methods, this approach has enormous advantages of less computations and short time-consuming. The approach uses SURF algorithm to extract feature points. The feature descriptor of the approach is determined by Haar...
AgI nanoparticle has been reported to exhibit size-dependent properties. In the paper, we reported the use of combinations of surfactants, such as AOT, SDS, PVP and TWEEN20, to control the AgI synthesis. AgI nanoparticles can be obtained with different sizes. Measured and confirmed by DLS and TEM, the nanoparticles can be massively and evenly prepared with the sizes less than 20nm. The post-processing...
This paper reports a microfluidic reactor for synthesizing micro- and nano-droplets using fluid shearing instability of immiscible flow in mircochannels. Three factors, flow rate between the two inputs, spout geometry and surface tension are numerically studied. Based on the simulation, a device with the optimal parameters was fabricated and tested. Both computational fluid dynamics (CFD) simulation...
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