Abstract: A p-phenylenediamine rubber antidegradant compound has a cycloalkyl structure named N-(3,5,5-trimethylcyclohexyl)-N?-phenyl p-phenylenediamine. The compound is prepared by reacting a compound A, 4-aminodiphenylamine, and hydrogen in a condensation hydrogenation reaction in presence of a catalyst, and the compound A is 3,5,5-trimethyl-2-cyclohexen-1-one, 3,3,5-trimethylcyclohexanone, 3,3,5-trimethylcyclohexanol, or combination thereof.

Abstract: Disclosed are a method and apparatus for positioning navigation in a human body by means of augmented reality based upon a real-time feedback, the method includes: obtaining a first 3D reconstructed image of a target object according to medical image data corresponding to properties of the target object, a medical database system, and/or a first set of user instructions; generating image transformation parameters according to information extracted from feature points from the target object acquired by an AR device, and the first 3D reconstructed image; and to adjust the first 3D reconstructed image according to the image transformation parameters to obtain a second 3D reconstructed image, and displaying in a real-time fashion the second 3D reconstructed image on the AR device.