Abstract: An air vent may comprise an air outlet that is open on one side and discharges air, a first wing that is disposed on the open side of the air outlet and guides air upward or downward by rotating up and down, a second wing that is disposed at a rear side of the first wing and guides air to the left or right by rotating left or right, and a knob that is movable forward and backward and interlocks with the first wing or the second wing depending on disposition thereof, and the knob may be disposed outside the air outlet.

Abstract: A rotary damper includes an operating part mounted in an interior in a vehicle in such a manner that the operating part can be introduced or withdrawn, an operating part case that guides a path of the operating part, a pinion gear mounted to one side of the operating part and a guide rail rotatably mounted to the operating part case such that the pinion gear can be engaged with the guide rail. Further, a separation preventing protrusion is provided at a portion of the guide rail, where the pinion gear starts to move in a curvilinear form, the separation preventing protrusion configured to support an outside surface of the pinion gear.

Abstract: An apparatus separating a polarizable analyte using dielectrophoresis includes a vessel including a membrane having a plurality of nano- to micro-sized pores, the membrane disposed inside the vessel, electrodes generating spatially non-uniform electric fields in the nano- to micro-sized pores of the membrane when an AC voltage is applied to the electrodes, and a power source applying the AC voltage to the electrodes, wherein a sectional area of the pores varies along a depth of the pores. A method of separating a polarizable material uses the apparatus.