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Due to the large misalignment angle, the error model of a strapdown inertial navigation system (SINS) is nonlinear. To solve the problem of the model inaccurateness and the influences on alignment accuracy caused by the linearization of the nonlinear model, the nonlinear model for initial alignment of large misalignment angle in SINS is established. To improve the accuracy of the initial alignment...
In this study, the gene encoding purine nucleoside phosphorylase (PNPase) from Bacillus subtilis W168 was identified, cloned and expressed in Bacillus subtilis AG208. The gene encodes a polypeptide of 233 amino acids with a calculated molecular weight of 25,018 Da. The enzyme activity of the recombinant protein (AGPNP) was analyzed by temperature and pH perturbation difference spectra. Results showed...
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