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This paper presents a comprehensive virtual simulation model for CNC systems. The Virtual CNC (VRCNC) has a modular architecture and the special function. It can show movement process and the result, it can also show the effect of different movement mode, the displacement, velocity and acceleration of the process, the rationality of interpolation method and the motion control method. Additional CNC...
Over the last few years, wind power is the fastest growing, most widely used of the emerging renewable energy. Due to the randomness of wind power and it is not controllable, wind power is intermittent and volatility. With the increase of proportion of wind power in power grid, control the influence of wind power to power grid system frequency stability, becomes the key to ensure system stability...
According to the experimental and theoretical derivation, we present the first study of the CNC machine tool control theory based on the relation between geometry and motion. By studying the trajectory characteristics in both multidimensional space and time space, the displacement and its derivatives are designed as a motion vector space. With this vector space, the relationship among geometric parameters,...
In order to change the position control into physical motion control, and give up interpolation calculation, a physical motion model of CNC machine tool has been built. The relation between geometric parameters, motion parameters and planning parameters is studied with kinematics principle and geometric principle. The motion differential equations are worked out, It can be used to calculate transient...
A protein named as levoglucosan kinase (EC 2.7.-.-)was purified to homogeneity from a wild isolated strain of Lipomyces starkeyi YZ-215. The protein was purified approximately 30-fold by conventional ammonium sulphate fractionation followed by Resource Q chromatography and two steps of Superdex 200 chromatography, and its physical and kinetic properties were investigated. The purified enzyme showed...
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