Abstract: A method for shape-performance control by ultrasonic rolling combined with selective laser melting is provided, which includes following steps: S1, establishing a three-dimensional model of a component to be processed, and setting printing process parameters; S2, after nitrogen gas is filled into a forming cavity to reduce an oxygen content to a preset value, lowering a forming substrate and raising a powder substrate, laying powder from the powder substrate onto the forming substrate by a scraper, recovering excess powder, and after the laying is completed, melting the powder by a laser galvanometer to form a solid layer, and cycling for several times; S3, performing ultrasonic rolling on a surface of the solid layer; S4, cycling steps S2 and S3 until the component is formed, and ending the cycling; and S5, performing ultrasonic rolling on a surface of a formed component to obtain a solid component.

Abstract: A new login method enables user friendly login process using X.509 digital certificate. A special purpose web page plug-in enables such login capability by plug-and-play to any web site login page. Multifold certificate is composed of multiple certificates with each of them contains different amount of personal information (FIG. 1) suitable for different business purpose. A daemon runs in user's computer to retrieve certificate and communicate with the plug-in on behalf of user. The daemon ensures the mutually agreement between user and web server on the type of certificate to be used during the login process. A password recovery method ensure smooth recovery from lose of password. The security feature allows a user to login from many different computers by transferring the multifold certificate freely. An invariant user identifier is constructed from user's personal data in a particular way (FIG. 2) so that the identifier is the same regardless where and when it is constructed.