Abstract: A gas extraction device for metal mineral inclusions and a gas extraction method therefor are provided, the device includes a base plate, an annular carrier, sealing covers, a grinding assembly, a vacuum assembly, a gas-gathering assembly and a mass spectrometer. The annular carrier is disposed on the base plate, multiple grinding chambers are defined and evenly distributed in a circular shape on the annular carrier, the sealing covers are disposed at openings of the grinding chambers, the grinding assembly includes grinding hammers, and the grinding hammers penetrate through the sealing covers and extend into the grinding chambers. Side walls of each grinding chamber defines a first through hole and a second through hole. The vacuum assembly is communicated with the grinding chambers through the first through holes. The gas-gathering assembly is communicated with the grinding chambers through the second through holes. The mass spectrometer is communicated with the gas-gathering assembly.

Abstract: An educational ruler is a protractor, where the protractor can draw and measure angles. The educational ruler includes a planar disk having a semicircular circumference and labeled in scales along the semicircular circumference; a straight line edge connecting two edges of the semicircular circumference; a through hole on the planar disk; a first edge and a second edge extending from the through hole to the straight line edge; a third edge and a fourth edge extending from the semicircular circumference to the straight line edge. The first edge of the through hole of the educational ruler and the second edge of the through hole of the educational ruler intersect at 90 degrees scale of the planar disk to form the first right angle, and the included angle of the first edge of the through hole of the educational ruler and the straight line edge of the educational ruler is 45 degrees.

Abstract: An educational ruler is a protractor, where the protractor can draw and measure angles. The educational ruler includes a planar disk having a semicircular circumference and labeled in scales along the semicircular circumference; a straight line edge connecting two edges of the semicircular circumference; a through hole on the planar disk; a first edge and a second edge extending from the through hole to the straight line edge; a third edge and a fourth edge extending from the semicircular circumference to the straight line edge. The first edge of the through hole of the educational ruler and the second edge of the through hole of the educational ruler intersect at 90 degrees scale of the planar disk to form the first right angle, and the included angle of the first edge of the through hole of the educational ruler and the straight line edge of the educational ruler is 45 degrees.

Abstract: An optical cable system includes switching circuitry, a resistance network, optical-to-electrical conversion circuitry, and electrical-to-optical conversion circuitry. The electrical-to-optical conversion circuitry can convert an electrical transmit signal into an optical transmit signal. When the optical-to-electrical conversion circuitry detects a received optical signal having an optical power exceeding a threshold, the optical-to-electrical conversion circuitry produces a switching signal that causes the switching circuitry to couple the resistance network to a terminal or other node associated with the electrical transmit signal, thereby changing the impedance at that node as perceived by plug-in detection circuitry of a device such as a computer or peripheral.

Abstract: An optical cable system includes switching circuitry, a resistance network, optical-to-electrical conversion circuitry, and electrical-to-optical conversion circuitry. The electrical-to-optical conversion circuitry can convert an electrical transmit signal into an optical transmit signal. When the optical-to-electrical conversion circuitry detects a received optical signal having an optical power exceeding a threshold, the optical-to-electrical conversion circuitry produces a switching signal that causes the switching circuitry to couple the resistance network to a terminal or other node associated with the electrical transmit signal, thereby changing the impedance at that node as perceived by plug-in detection circuitry of a device such as a computer or peripheral.

Abstract: An automatic vendor system used in hotels is provided, comprising: automatic vending machines each having a man-machine interaction interface, being used as vending and pickup platforms; a host being configurable for operation control, monitoring and storing information, which has a plurality of automatic vendor and management functions; a plurality of local shopping networks are formed and arranged in a hotel to generate a chain store network in an area through connection of computer network; through a information transfer link of production-direct marketing constructed with the sales information from the local networks, shortage of goods in a day is collected so as to supplement goods in the single vending machines; customers select goods through a touch screen after receiving an electronic cash card, then the host inquires cash amount through the reader and send an delivery instruction to the control board, the control board records and subtracts quantity of the purchased goods, and control a corresponding

Abstract: An animation embedded automatic vending machine is provided, comprising: a core board having a chip with high video playing capability; a 3D animation system for simulating the scene of a customer entering into a store to do shopping; a sales system supporting charge, computation, data storage and financial report printing; the 3D animation system is embedded into a shopping procedure control module; the sales system is connected to corresponding ports of the core board respectively, a display screen arranged on a man-machine interaction interface of the automatic vending machine, and a FPGA control bottom board, are connected to the core board of the automatic vending machine respectively, and the FPGA control bottom board instructs a delivery executing mechanism of the automatic vending machine to deliver the goods selected via the animation window.