Abstract: A marine-derived nanoselenium-producing strain and a method for preparing nanoselenium by using the strain are provided in the present disclosure, belonging to the field of nano biomaterials. According to the present disclosure, a Bacillus strain capable of preparing nanoselenium is screened from sediments taken from the Arctic Ocean, named Bacillus sp. Q72, which has been deposit in the China General Microbiological Culture Collection Center, and the deposit number is CGMCC No.26355. The extracellular fluid of this strain is used to directly reduce high concentrations of sodium selenite to obtain selenium nanoparticles.

Abstract: A matching network circuit with tunable impedance and a tuning method thereof provided. The matching network circuit includes an inductor, a tunable capacitor, a tunable resistor and an auto-tuning circuit. The tunable capacitor is connected to the inductor. The tunable resistor is connected to the inductor. The auto-tuning circuit is connected to the tunable capacitor and the tunable resistor. Auto-turning circuit tunes the tunable capacitor and the tunable resistor over process variation.

Abstract: The disclosure relates to a three-dimensional printer coupled with microwave and a printing method applied for food design. A microwave heating probe embedded in the inner wall of a barrel releases microwaves at the front end, and in combination with the setting of a vertical distance between the front end of the microwave heating probe and an extrusion nozzle, the effect of instant curing of an extruded material is realized. A cooling device is disposed so as to ensure that a material to be printed in the barrel is not cured by microwave heating before the material to be printed enters the extrusion nozzle.

Abstract: The disclosure discloses a three-dimensional printer coupled with microwave and printing method applied for food design, and belongs to the technical field of food.

Abstract: A matching network circuit with tunable impedance and a tuning method thereof provided. The matching network circuit includes an inductor, a tunable capacitor, a tunable resistor and an auto-tuning circuit. The tunable capacitor is connected to the inductor. The tunable resistor is connected to the inductor. The auto-tuning circuit is connected to the tunable capacitor and the tunable resistor. Auto-turning circuit tunes the tunable capacitor and the tunable resistor over process variation.

Abstract: A transceiver for use in induction-based communication protocols, such as radio-frequency identification (RFID) and near field communication (NFC), is described. The transceiver may be arranged such that the transmitter and the receiver share a common input/output (I/O) terminal. The transceiver may be configured to interrogate a transponder to which it is inductively coupled, and to wait for the transponder's response. Data transmitted back by the transponder may be detected by sensing an impedance modulation at the I/O terminal or at a node whose impedance varies with the I/O terminal. The impedance modulation may be sensed by allowing a current to be modulated by the impedance variation and by converting the current into a voltage. The corresponding voltage modulation may be sensed by a receiver.