Abstract: An airway structure, a cylinder cover and a Miller-profile engine are provided. The airway structure includes an intake duct and an intake valve arranged on an intake side, and an exhaust duct and an exhaust side roof arranged on an exhaust side. An angle of an axis of an intake valve stem relative to an assembly bottom surface of the cylinder cover is a1; an angle between a revolution cone surface of an intake valve disc and the axis of the intake valve stem is a2, an angle between a plane where the exhaust side roof is located and the assembly bottom surface is a3, a lower guide surface of the intake duct close to an intake throat is inclined downward at an angle of a4 relative to the assembly bottom surface. The airway structure satisfies: a3-3°?a1-a2?a3+3°; and/or, a4-3°?a1-a2?a4+3°.

Abstract: An airway structure, a cylinder cover and a Miller-profile engine are provided. The airway structure includes an intake duct and an intake valve arranged on an intake side, and an exhaust duct and an exhaust side roof arranged on an exhaust side. An angle of an axis of an intake valve stem relative to an assembly bottom surface of the cylinder cover is a1; an angle between a revolution cone surface of an intake valve disc and the axis of the intake valve stem is a2, an angle between a plane where the exhaust side roof is located and the assembly bottom surface is a3, a lower guide surface of the intake duct close to an intake throat is inclined downward at an angle of a4 relative to the assembly bottom surface. The airway structure satisfies: a3?3°?a1-a2?a3+3°; and/or, a4?3°?a1-a2?a4+3°.

Abstract: Disclosed is an antimicrobial silicone rubber, functional macromolecules being chemically bonded to the surface of the silicone rubber and containing vinyl or ethynyl, and the functional macromolecules being chemically bonded to the surface of the silicone rubber by means of vinyl or ethynyl; the functional macromolecules comprise polyamino acid macromolecules of which the molecular structure is as shown in (I) and (II).

Abstract: Disclosed is an antimicrobial silicone rubber, functional macromolecules being chemically bonded to the surface of the silicone rubber and containing vinyl or ethynyl, and the functional macromolecules being chemically bonded to the surface of the silicone rubber by means of vinyl or ethynyl; the functional macromolecules comprise polyamino acid macromolecules of which the molecular structure is as shown in (I) and (II).

Abstract: A suture fixation arthroscope apparatus of the temporomandibular joint (TMJ) disk comprises a first suture needle and a first inner core, a second suture needle and a second inner core, and a third suture needle. The tail ends of the first and second suture needles are connected with a big handle via a valve panel, a vertical groove is opened towards the center of a circle of the surface of the big handle, a horizontal groove which is the same size as the vertical groove is vertically set at the place of the big handle connecting the valve panel. The first inner core includes a seamless tube and a top welded with wire snares, the second inner core includes a seamless tube and a top welded with a crochet hook, the radian near the tails of the first and second inner cores is 90 degrees, a small handle is connected at the tails.