Abstract: A method for preparing a poly(thioctic acid)-copper coating (poly(TA-Cu)) on a surface of a cardiovascular stent material includes: grinding a cardiovascular stent material with sandpaper until the surface of the cardiovascular stent material is flat and smooth, rinsing the cardiovascular stent material with deionized water and anhydrous ethanol in sequence, and drying the cardiovascular stent material to obtain a pre-treated cardiovascular stent material; dissolving thioctic acid in an alcoholic solvent, adding anhydrous copper chloride to a mixed solution of thioctic acid and the alcoholic solvent, stirring the mixed solution, to yield a precursor solution; treating the pre-treated cardiovascular stent material with the precursor solution, and drying, thus forming a poly(thioctic acid)-copper coating on the surface of the pre-treated cardiovascular stent material. The concentration of thioctic acid in the alcoholic solvent is 0.1-0.

Abstract: A steering wheel assembly having a braking function, including: a steering wheel, a steering shaft, and a controller. The steering wheel is connected to one end of the steering shaft. The steering wheel includes a rim body and spokes. The rim body is connected to the steering shaft via the spokes. A force sensor, a photoelectric sensor, a mechanical wave sensor or a switch are provided between the rim body and the spokes, or provided on one side of the rim body away from a driver, or provided between the spokes and the steering shaft, or provided on the steering shaft, and are connected to the controller. The controller is connected to a braking system.

Abstract: A steering wheel assembly having a braking function, including: a steering wheel, a steering shaft, and a controller. The steering wheel is connected to one end of the steering shaft. The steering wheel includes a rim body and spokes. The rim body is connected to the steering shaft via the spokes. A force sensor, a photoelectric sensor, a mechanical wave sensor or a switch are provided between the rim body and the spokes, or provided on one side of the rim body away from a driver, or provided between the spokes and the steering shaft, or provided on the steering shaft, and are connected to the controller. The controller is connected to a braking system.

Abstract: The present invention provides amino acid sequences of engineered decarboxylase polypeptides that are useful for catalyzing the decarboxylation of L-aspartate to produce ?-alanine, and the preparation process of engineered decarboxylase polypeptides as well as reaction process under industrial-relevant conditions. The present disclosure also provides polynucleotide sequences encoding engineered decarboxylase polypeptides, engineered host cells capable of expressing engineered decarboxylase polypeptides, and methods of producing ?-alanine using the engineered cells. Compared to the wild-type decarboxylase, the engineered decarboxylase polypeptide provided by the invention has better activity and stability, and overcomes the inhibition by L-aspartic acid and/or ?-alanine. The use of the engineered polypeptides of the present invention for the preparation of ?-alanine results in higher unit activity, lower cost, and has good industrial application prospects.

Abstract: An application program management method for multiple hardware platforms includes steps of: pre-compiling a target application program into versions for supporting different hardware platforms; establishing a mapping relation between hardware platform types and corresponding application program versions, and specifying a generic application program version; when a client computer requires the target application program, requiring a client computer hardware platform type and then searching a mapping relation between the client computer hardware platform type and a corresponding application program version thereof; if found, requiring the corresponding application program version; if not, requiring the generic application program version.

Abstract: The present invention provides amino acid sequences of engineered decarboxylase polypeptides that are useful for catalyzing the decarboxylation of L-aspartate to produce ?-alanine, and the preparation process of engineered decarboxylase polypeptides as well as reaction process under industrial-relevant conditions. The present disclosure also provides polynucleotide sequences encoding engineered decarboxylase polypeptides, engineered host cells capable of expressing engineered decarboxylase polypeptides, and methods of producing ?-alanine using the engineered cells. Compared to the wild-type decarboxylase, the engineered decarboxylase polypeptide provided by the invention has better activity and stability, and overcomes the inhibition by L-aspartic acid and/or ?-alanine. The use of the engineered polypeptides of the present invention for the preparation of ?-alanine results in higher unit activity, lower cost, and has good industrial application prospects.

Abstract: A temporary file management method for operating system or applications is disclosed, which comprises steps of creating a to-be-deleted-next-time-content directory beforehand and at least one not-to-be-deleted-next-time-content directory; saving temporary files in the to-be-deleted-next-time-content directory or the not-to-be-deleted-next-time-content directories when the operating systems or the applications is running; deleting the files in the to-be-deleted-next-time-content directory when a pre-set temporary file cleaning condition are triggered; specifying a not-to-be-deleted-next-time-content directory; switching and saving files in the specified not-to-be-deleted-next-time-content directory in the to-be-deleted-next-time-content directory. The present invention prevents the temporary files from occupying the storage space for a long time, which ensures the operating system runs with high efficiency, space saving and good user experience.

Abstract: A temporary file management method for operating system or applications is disclosed, which comprises steps of creating a to-be-deleted-next-time-content directory beforehand and at least one not-to-be-deleted-next-time-content directory; saving temporary files in the to-be-deleted-next-time-content directory or the not-to-be-deleted-next-time-content directories when the operating systems or the applications is running; deleting the files in the to-be-deleted-next-time-content directory when a pre-set temporary file cleaning condition are triggered; specifying a not-to-be-deleted-next-time-content directory; switching and saving files in the specified not-to-be-deleted-next-time-content directory in the to-be-deleted-next-time-content directory. The present invention prevents the temporary files from occupying the storage space for a long time, which ensures the operating system runs with high efficiency, space saving and good user experience.

Abstract: An application program management method for multiple hardware platforms includes steps of: pre-compiling a target application program into versions for supporting different hardware platforms; establishing a mapping relation between hardware platform types and corresponding application program versions, and specifying a generic application program version; when a client computer requires the target application program, requiring a client computer hardware platform type and then searching a mapping relation between the client computer hardware platform type and a corresponding application program version thereof; if found, requiring the corresponding application program version; if not, requiring the generic application program version.