Abstract: A solid phase extraction column, preparation method therefor, and pre-processing method of chemical sample based on solid phase extraction column. The solid phase extraction column includes a separation column, and a solid phase extraction agent tilled within the separation column. The solid phase extraction agent is graphene or modified graphene. The solid phase extraction column is prepared by loading the solid phase extraction agent into the separation column, and vibrating to compact the solid phase extraction agent. The solid phase extraction column is used to pre-process a chemical sample to realize a highly effective separation effect. The problem of data distortion caused by being unable for a target component to be detected in a subsequent detection or being unable to detect a real value, is avoided.

Abstract: An adjustable sprinkler system includes a plurality of sprinkler units disposed about an area to receive water. Each sprinkler unit includes a tapered base portion driven into the earth, and a pair of connector nipples to receive and retain flexible tubing which connects the sprinkler units and supplies water under pressure thereto. Each sprinkler unit includes a cylindrical member extending upwardly from the tapered base portion, with a cap threaded onto the exterior of the cylindrical portion. An arbor is received in a bore in the cylindrical member and is secured pivotally therein. The arbor is rotatable to adjust the rate of flow of water from the sprinkler, while the cap is rotatable independently to vary the spray pattern issuing from each sprinkler.

Abstract: A machine for re-inking printing ribbons for line printers and the like includes a pair of spaced apart spool mechanisms which receive the supply and take-up spools of the ribbon. Disposed between the spool mechanisms is an inking roller which is partially submerged in an ink tank. Adjacent to the tank is a light source and light pipe assembly for detecting holes in the ribbon to be inked. The device accommodates ribbon spools of differing lengths, and is also provided with a ribbon edge sensor which controls the axial position of the ribbon as it is wound onto one of the spools. The spool mechanisms drive the ribbon past the hole detector in one pass, and a pressure roller urges the ribbon onto the inking roller in another pass to re-ink the ribbon.

Abstract: An ultrasonic transmitter for apprising a central burglar alarm system of an unauthorized event includes a transmitting diaphragm which is repeatedly struck by a metal ball driven by a lever. The lever is actuated by a toothed wheel which is rotated by a motor spring, the rotation being governed to maintain constant speed and constant ultrasonic pulse rate. The rotation of the wheel is stopped by a striker interfering therewith, the striker being spring biased to the non-interference position. Thus the striker must be retained in the interference position by a door, window, trip wire, or the like, and any disruption of these structures will trip the striker and cause the transmitter to generate an ultrasonic pulse train and sound an alarm.

Abstract: A device for improving the fuel economy of new or existing internal combustion engines includes a vacuum sensing switch connected to the intake manifold of the engine, and a speed-sensing electronic circuit connected to the distributor of the engine. The device also includes a solenoid operated valve interposed between the ambient atmosphere and the positive crankcase ventilation valve normally found in an internal combustion engine. The device includes a computing circuit which operates on the information from the speed sensor and the vacuum switch to actuate the solenoid operated valve when the engine is idling, accelerating, or deaccelerating. The ambient, uncarbureted air introduced through the positive crankcase ventilation valve increases the air-to-fuel ratio within the intake manifold, thereby increasing the efficiency of the engine.

Abstract: A system for providing coverage of a local event such as a sporting event for the spectators thereof includes a plurality of portable radio broadcast receivers to be carried by the spectators. A central control mobile unit provides program material relating to the event to a plurality of radio relay units disposed about the site of the event. Associated with each relay unit is a local transmitter which broadcasts to the portable receivers in the immediate area. Each relay or chain of relays may be provided with unique programmatic material which pertains to the activities in the vicinity of the associated local transmitters.

Abstract: A theft alarm for portable articles includes a pocket-sized housing from which extend a pair of opposed, pivotting jaws. One of the jaws is secured to an extendable ratchet shaft disposed within the housing. A cam rotated by a key lock device actuates a pawl which selectively retains the ratchet to lock the jaws about the article. The cam also actuates a leaf switch which activates a motion-sensing electronic circuit. The circuit actuates a pulsating audible alarm whenever the article is moved.

Abstract: A magnetically operated lock includes a fixed lock body in which a plurality of fixed permanent magnets are disposed in a predetermined pattern. Aligned with each permanent magnet is a hole in which a movable magnet is slidably disposed, the movable magnet being oriented to be repelled by the fixed magnet. A lock shaft is pivotally secured through the lock body, and a rotor secured to the shaft is disposed adjacent to the openings of the holes receiving the movable magnets. The rotor includes a plurality of detents which receive the movable magnets, locking the shaft in a fixed position. The key comprises a disc having a plurality of magnets embedded therein and oriented to repel the movable magnets and free the rotor and shaft for rotation.