Abstract: A parachute-designed biodegradable occluder is provided. The parachute-designed biodegradable occluder is with a proximal end adjacent to a human body and a distal end far away from the human body. The parachute-designed biodegradable occluder includes an occluder stent internally provided with a baffle film, and a shapeable ring with changeable states. The occluder stent, the baffle film and the shapeable ring are respectively made of polymer materials being degradable in biological tissues. The occluder is made of a biodegradable polymer material, which is degradable or absorbable by human tissues after being implanted for a period of time to make a defect site composed of human tissues, realizing occlusion without foreign matter. The occlusion effect is particularly significant for children.

Abstract: An ultrasonic testing system of dual robot arms and an ultrasonic testing method for use in testing quality of surface and interior of a workpiece. The system includes an extension rod provided between a tail-end of a master robot arm and an emitting probe and/or between a tail-end of a slave robot arm and a receiving probe. One or more connected extension rod rotating shafts is provided between the extension rod and the emitting probe or between the extension rod and the receiving probe. The method uses an X-axis constraint method to convert posture data of the discrete points in a trajectory file of the tested workpiece into Euler angles, and constrain the X-axes of the auxiliary coordinate systems at the same time so that the positive direction of the X-axis of each of the auxiliary coordinate systems is the trajectory tangent direction.

Abstract: An ultrasonic testing device that can make a robotic testing system reach the surface of a complex curved composite workpiece that is not easy to reach and perform a quality testing. By pumping a coupling liquid into the device so that the coupling liquid enters a waveguide and jets onto the surface of the workpiece, an ultrasonic wave can be transmitted in the waveguide and reach the surface of the workpiece and penetrate the workpiece, thereby achieving the purpose of quality testing of the workpiece. By providing two ultrasonic testing devices without a waveguide on both sides of a tested workpiece, respectively, and by mounting the waveguide on one side or both sides of the ultrasonic testing devices, it is possible to transmit the ultrasonic waves to the surface of the workpiece or to receive the ultrasonic waves from the surface of the workpiece.

Abstract: An ultrasonic testing device that can make a robotic testing system reach the surface of a complex curved composite workpiece that is not easy to reach and perform a quality testing. By pumping a coupling liquid into the device so that the coupling liquid enters a waveguide and jets onto the surface of the workpiece, an ultrasonic wave can be transmitted in the waveguide and reach the surface of the workpiece and penetrate the workpiece, thereby achieving the purpose of quality testing of the workpiece. By providing two ultrasonic testing devices without a waveguide on both sides of a tested workpiece, respectively, and by mounting the waveguide on one side or both sides of the ultrasonic testing devices, it is possible to transmit the ultrasonic waves to the surface of the workpiece or to receive the ultrasonic waves from the surface of the workpiece.

Abstract: An apparatus predicts time-series variations in resource usage for logical structures for a future time period (a schedule period) on the basis of a history representing the history of resource usage by the logical structures. The apparatus attempts to select a plurality of arrangement candidates for which resource usage in each of a plurality of physical machines is equal to or less than a criterion for each of a plurality of time segments comprising the schedule period. The apparatus computes a migration cost of migrating the logical structures between physical machines for an arrangement according to a holistic arrangement plan for each of a plurality of holistic arrangement plans. Each of the plurality of holistic arrangement plans is a combination of a plurality of selected arrangement candidates corresponding to each of the plurality of time segments.

Abstract: An apparatus predicts time-series variations in resource usage for logical structures for a future time period (a schedule period) on the basis of a history representing the history of resource usage by the logical structures. The apparatus attempts to select a plurality of arrangement candidates for which resource usage in each of a plurality of physical machines is equal to or less than a criterion for each of a plurality of time segments comprising the schedule period. The apparatus computes a migration cost of migrating the logical structures between physical machines for an arrangement according to a holistic arrangement plan for each of a plurality of holistic arrangement plans. Each of the plurality of holistic arrangement plans is a combination of a plurality of selected arrangement candidates corresponding to each of the plurality of time segments.