Abstract: A pavement anti-skid performance evaluation method based on envelope feature is provided. A surface profile image of a to-be-tested piece is acquired as a blank background image. A motion trajectory image of a sliding piece on the to-be-tested piece is acquired. The blank background image is treated to obtain a surface texture profile curve of the to-be-tested piece. The motion trajectory image is differenced with the blank background image to obtain a difference image, which is treated to obtain a trajectory envelope curve of motion of the sliding piece on the to-be-tested piece. An arithmetic mean of the trajectory envelope curve and an arithmetic mean of the surface texture profile curve are calculated, and the anti-skid performance is evaluated based on a height difference ?h between above two arithmetic means. A pavement anti-skid performance evaluation device based on envelope feature is also provided.

Abstract: The present invention is a urine analysis system, including a urine analyzer and a micro-fluidic chip, wherein the micro-fluidic chip is provided with several test strips and fluid channels corresponding to each test strip; and the liquid inlet end is arranged at the lower end of the micro-fluidic chip and connected to one end of the fluid channel. The liquid outlet end is arranged at the upper end of the micro-fluidic chip and connected to the other end of the fluid channel. The urine analyzer comprises a detector for detecting the test strips, a connection port for the micro-fluidic chip; and a suction device which connects the liquid outlet end of the micro-fluidic chip through the connection port. The manual operation part of this case is only to install the micro-fluidic chip into the urine analysis system, which not only avoids the time uncertainty caused by the manual sampling, but also makes the entire operation process more sanitary and safer.