With the aging of human society and the rapid development of transportation industry, the disease rates of bone and joint are also in constant increase, making the biological healing and regeneration of articular cart...
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With the aging of human society and the rapid development of transportation industry, the disease rates of bone and joint are also in constant increase, making the biological healing and regeneration of articular cartilage as a core issue of joint surgery in basic and clinical. In general, the regeneration capacity of articular cartilage injury difficult to selfrepair is considered to be limited. At present, many new technologies and methods have been used for clinical treatment, but it only can relieve the pain of the patients. Human knee joint has two main movement patterns: rolling and sliding. Rolling, as a typical representative of the articular cartilage, is very similar to the mechanical environment in vivo. Accordingly, we first proposed and developed this rolling depression loading device with perfusion system for the mechanobiology researching on in vitro articular cartilage, which includes rolling controlsystem, compression adjusting system and circulating perfusion system. The innovation of the biological reactor is the combination of the rolling loading system and circulation of grouting system. The roll controlling system is achieved by roller rolling back and forth through stepper motor driving screw rod. The compressive system could produce uniform, controlled compressions by relatively sliding of two wedge blocks. The circulating perfusion system is mainly finished by controlling the peristaltic pump. It can provide an environment which is closer to the normal physiological condition of articular cartilage. Rolling depression loading is useful to clarify the pathogenesis of osteoarthritis and apply biomechanical factors to prevent and treat osteoarthritis and repair cartilage. This device is small enough to work in the general culture box, and we will test it with biological experiment in future.
In laser cladding, the movement of the metal powder particles influences the cladding results directly. However, the movements of the metal powder particles are too hard to measure because the average diameter of the ...
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In laser cladding, the movement of the metal powder particles influences the cladding results directly. However, the movements of the metal powder particles are too hard to measure because the average diameter of the particles is about 50 μm and the movement behavior is very complex (collision of each other). The image process method based on digital particle image velocimetry (DPIV) technology is used to recognize the most particles. By this means, two images of the particle stream with a time interval are provided to determine the displacements of particles. Therefore, the velocity-vector field of the whole powder stream is obtained. Then, the convergence angle and the divergence angle of the powder flow can be measured by the velocity vectors, and the convergence region can be determined by the region of the maximum intensity of light. Results show that DPIV meets the needs of laser cladding and plays the role of guidance.
Wind power generation develops very fast in every country as a kind of important regenerative energy. The modeling of wind farm is the foundation of controlling and optimizing it. This paper introduced in detail the m...
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Wind farm modeling is an important research topic, but the traditional mechanism modeling method is difficult to get accurate models. However, performance of the neural network model is superior for identification and...
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According to the slow speed, low precision and low efficiency situation of the traditional detection method of the distribution of light illumination, a CCD-based detection method for the distribution of light illumin...
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In this paper, a specific description of the principles and procedures about how to use PCA method is given, in the field of fault detection in industrial systems, based on the Tennessee-Eastman process. An improved P...
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Sensorless vector control has been studied broadly, and motor speed identification is exactly very important. According to the fundamental equations of asynchronous motor for vector control, a MRAS speed identificatio...
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This paper presents a new image encryption algorithm, in this algorithm, shuffling matrix and diffusing matrix are generated based on Chen's hyper-chaotic system. Firstly, the Chen's hyper-chaotic system is us...
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It is of great significance for us to research security problems in the power system. After choosing static security, related theories and methods to be main research object, we calculate power flow and use transferri...
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Based on power conservation, this paper improves the current feed-forward control strategy on voltage source PWM rectifier, in order to remove the current sensor in dc side, and reduce hardware cost. The results of si...
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