Virtual experiment teaching is an important part of higher education institutions and research institutions. It plays an important role in helping students develop basic experimental research capabilities and innovative experimental research concepts. Mechanical majors focus on the cultivation of students' practical hands-on ability, but the traditional mechanical experimental equipment update iteration is slower, the experimental cost is higher, and there are potential safety hazards. In order to solve the problems encountered in the above mechanical experiment teaching, this paper focuses on the characteristics of the mechanical disciplines, after analyzing the development of virtual experiments at home and abroad, using the B/S architecture, Bootstrap framework and Hibernate technology, and the virtual reality technology and augmented reality technology in Unity3D environment are used to design and implement the mechanical virtual experiment teaching platform. Users can select the corresponding experiment in the virtual platform. In the experiment, the parts can be viewed from different perspectives. After the experiment is completed, the experimental result information can be obtained, and the experiment report can be completed online, which effectively saves teachers and students time. Through the survey of 518 students and 52 teachers who used this platform, most of the teachers and students agreed with the rich multimedia resources, friendly interaction and convenient collaborative communication of the mechanical virtual experiment teaching platform.
With the development of computer technology and three-dimensional reconstruction technology, three-dimensional reconstruction based on visual images has become one of the research hotspots in computer graphics. Three-dimensional reconstruction based on visual image can be divided into three-dimensional reconstruction based on single photo and video. As an indirect three-dimensional modeling technology, this method is widely used in the fields of film and television production, cultural relics restoration, mechanical manufacturing, and medical health. This article studies and designs a stereo vision system based on two-dimensional image modeling technology. The system can be divided into image processing, camera calibration, stereo matching, three-dimensional point reconstruction, and model reconstruction.In the part of image processing, common image processing methods, feature point extraction algorithm, and edge extraction algorithm are studied. On this basis, interactive local corner extraction algorithm and interactive local edge detection algorithm are proposed. It is found that the Harris algorithm can effectively remove the features of less information and easy to generate clustering phenomenon. At the same time, the method of limit constraints is used to match the feature points extracted from the image. This method has high matching accuracy and short time. The experimental research has achieved good matching results. Using the platform of binocular stereo vision system, each step in the process of three-dimensional reconstruction has achieved high accuracy, thus achieving the three-dimensional reconstruction of the target object. Finally, based on the research of three-dimensional reconstruction of mechanical parts and the designed binocular stereo vision system platform, the experimental results of edge detection, camera calibration, stereo matching, and three-dimensional model reconstruction in the process of three-dimensional reconstruction are obtained, and the full text is summarized, analyzed, and prospected.
BACKGROUND: Due to the high energy density of lithium-ion batteries, they have become the main power sources for electric vehicles. However, lithium-ion batteries suffer from severe capacity fading during their electrochemical cycles. Therefore, it is significant to develop perfect electrode materials for lithium-ion batteries. It is known that the traditional anode materials have low specific capacity value and poor cycle performance. To overcome this problem, a novel anode material is designed in our work. RESULTS: In electrochemical tests, the initial specific capacity of the NiCo 2 O 4 spheres/nanosheets (NCOs/n) electrode is as high as 1426 mAh g −1 at the current density of 0.2 C. The capacity of the NCOs/n electrode can maintain at 1020 mAh g −1 at the current density of 1C after 1000 cycles. CONCLUSIONS: The as-prepared NCOs/n electrodes exhibit high specific capacity value and superior cycle stability in high current densities.
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