Abstract: A wideband antenna system includes a first metal radiation portion, having a coupling distance with a second metal radiation portion; a first feeding contact and a second feeding contact, electrically connected to the first metal radiation portion and the second metal radiation portion respectively, and close to the coupling distance; a first ground contact, electrically connected to the second metal radiation portion; a second ground contact, electrically connected to the first metal radiation portion; an impedance tuner, electrically connected to the first feeding contact, the second feeding contact, the first ground contact, the second ground contact, and a radio frequency signal source, to switch the first metal radiation portion and the second metal radiation portion; an aperture contact, electrically connected to the first metal radiation portion; and an aperture tuner, electrically connected to the aperture contact.

Abstract: A vacuum arc thruster with multi-layer insulation includes a housing, an anode unit and a cathode unit spaced apart from each other in the housing, and an insulator disposed between the anode unit and the cathode unit. The insulator includes a plurality of fuel layers and a plurality of insulating layers. Each insulating layer is located between every two adjacent fuel layers. Accordingly, a multiple-layer design is formed by arranging the fuel layers and the insulating layers which are made of different materials in an alternating manner, thereby attaining the maximum field emission effect, increasing the stability and efficacy of operating the vacuum arc thruster, and prolonging the service life of the thruster.

Abstract: An electronic device is provided. The electronic device includes a plurality of main device antennas, a switch, and a processor. The switch enables at least one of the main device antennas. The processor is electrically connected to the switch and controls the switch to switch the enabled main device antenna based on a usage status of the electronic device.

Abstract: A heat dissipation device for a projector includes a light source, a light valve, a prism set, a shading element, and a projection lens. The light source emits a light beam. The light valve is disposed downstream of a light path of the light source to receive the light beam, convert a part of the light beam into image light and another part of the light beam into an ineffective light beam. The prism set includes at least one prism, receiving the image light and the ineffective light beam. The shading element includes a heat dissipation part and is disposed downstream of a light path of the prism set and used to block the ineffective light beam from the prism set. The projection lens is disposed downstream of the light path of the prism set.

Abstract: A control device for controlling a power generation system comprises a reception module, for receiving environmental data from the power generation system; an environment generation module, coupled to the reception module, for generating an environment state of the power generation system according to the environment data and an environment model; a strategy generation module, coupled to the environment generation module, for generating a power of the power generation system according to the environmental state, and for generating a control strategy of the power generation system according to the power; a transmission module, coupled to the strategy generation module, for transmitting the control strategy to the power generation system.

Abstract: A 3D printing apparatus including a base plate, a transparent plate, a fluid space, a molding container, a heater, a fluid guider and a light engine is provided. The fluid space is disposed between the base plate and the transparent plate. The molding container has an accommodating space and the base plate is disposed in the accommodating space. The heater is configured to heat a fluid. The fluid guider is configured to guide the heated fluid into the fluid space. The light engine is configured to project a pixelated light on the base plate.

Abstract: An electronic device is provided. The electronic device includes a plurality of main device antennas, a switch, and a processor. The switch enables at least one of the main device antennas. The processor is electrically connected to the switch and controls the switch to switch the enabled main device antenna based on a usage status of the electronic device.

Abstract: An electronic device having multiple antennas and an antenna configuration method are provided. The antenna configuration method includes: controlling a communication module of an electronic device to electrically connect to a main antenna of the electronic device; determining whether an operating state of the electronic device conforms to a preset usage situation; and controlling the communication module to electrically connect to an auxiliary antenna of the electronic device when the operating state conforms to the preset usage situation, so that the communication module transmits and receives the radio frequency signal by the auxiliary antenna.

Abstract: An electronic device is disclosed. The electronic device includes a conductive plate, an opening, two feeding parts, and an electronic assembly. The opening is disposed at a side of the conductive plate. The opening has a first side and a second side opposite to each other, and the first side and the second side are connected with the side of the conductive plate. The electronic assembly is located in the opening. Two feeding parts are respectively disposed on the first side and the second side of the opening. the feeding parts is used to receive a feeding signal, and the feeding signal is transmitted along the first side of the opening to the second side of the opening and generates a near field magnetic field.

Abstract: An electronic device having multiple antennas and an antenna configuration method are provided. The antenna configuration method includes: controlling a communication module of an electronic device to electrically connect to a main antenna of the electronic device; determining whether an operating state of the electronic device conforms to a preset usage situation; and controlling the communication module to electrically connect to an auxiliary antenna of the electronic device when the operating state conforms to the preset usage situation, so that the communication module transmits and receives the radio frequency signal by the auxiliary antenna.

Abstract: An antenna module is provided. The antenna module includes a circuit board, a conductive layer, and a spiral coil. The circuit board has a first surface and a second surface opposite to each other. The circuit board further includes a first block and a second block connected to each other. The conductive layer is disposed on the first block. The spiral coil is disposed in the second block of the circuit board. The conductive layer at least partially surrounds the spiral coil.

Abstract: An electronic device is disclosed. The electronic device includes a conductive plate, an opening, two feeding parts, and an electronic assembly. The opening is disposed at a side of the conductive plate. The opening has a first side and a second side opposite to each other, and the first side and the second side are connected with the side of the conductive plate. The electronic assembly is located in the opening. Two feeding parts are respectively disposed on the first side and the second side of the opening. the feeding parts is used to receive a feeding signal, and the feeding signal is transmitted along the first side of the opening to the second side of the opening and generates a near field magnetic field.

Abstract: The present invention provides Systems and Methods for Creating an Optimal Prediction Model and Obtaining Optimal Prediction Results Based on Machine Learning. In the method for creating an optimal prediction model, the steps are first to input a plural training data and at least one of machine learning algorithms, then convert the training data into a relay format. The method is further to select the automated predictive features, optimize the machine learning algorithm parameter, and then optimize the iterative prediction model. After that, a prediction model and an accuracy assessment data are outputted. In the process of obtaining the prediction result, the data to be predicted is converted into a relay format, and an automated program is used for iterative prediction to generate and output the prediction result and accuracy evaluation data.

Abstract: A method of distributed computing, wherein the management system includes a plurality of data temporary storage nodes. The user application connects to a neighboring data temporary storage node and uploads the project data need to be processed. The data temporary storage node publishes the tasks of the project in a blockchain network, examines the project and evaluates the processing work. After the user application approves the proposal of processing fees from the data temporary storage node, the data temporary storage node distributes the data of project tasks to the computing resources undertake the project tasks respectively. The computing resources in the blockchain network connect to the neighboring data temporary storage nodes and undertake project tasks respectively.

Abstract: A range hood includes a housing, a cover, an exhaust pipe and at least two vacuum fans. The housing has a top and bottom openings opposite to each other. The cover is disposed in the housing and adjacent to the bottom opening. The cover has an air inlet facing the bottom opening. The exhaust pipe is disposed in the housing and located between the top opening and the cover. The exhaust pipe has an air outlet adjacent to the top opening and communicates with the cover. The vacuum fans are disposed in the cover and located between the air inlet and the exhaust pipe. Each vacuum fan has an air flow inlet adjacent to the air inlet and an air flow outlet adjacent to the air outlet. An area of the air inlet is greater than or equal to an area of the air flow inlets.

Abstract: An electronic device is provided. The An electronic device comprises a near field communication (NFC) circuit for transmitting a set of near field communication differential signals including a first differential signal and a second differential signal; a housing including a conducting portion with a ground point, a first side and a second side opposite to the first side; and two conductive arms. A current loop is formed by the conductive arm and the conducting portion, and a potential of the ground point is equal to a median potential of the current loop.

Abstract: An antenna module is provided. The antenna module includes a circuit board, a conductive layer, and a spiral coil. The circuit board has a first surface and a second surface opposite to each other. The circuit board further includes a first block and a second block connected to each other. The conductive layer is disposed on the first block. The spiral coil is disposed in the second block of the circuit board. The conductive layer at least partially surrounds the spiral coil.

Abstract: A wireless communication device is provided. The wireless communication device comprises: a first antenna for receiving and transmitting a first sub-band signal of a first frequency band and a second sub-band signal of the first frequency band; a second antenna for receiving and transmitting the second sub-band signal and a second frequency band signal; a third antenna for receiving and transmitting a first sub-band diversity signal of the first frequency band; a first frequency-division multiplex coupled to the first antenna; a switching circuit coupled to the first frequency-division multiplex and the second antenna; a primary path component coupled to the first frequency-division multiplex and the switching circuit; a secondary path component coupled to the switching circuit and the third antenna; a first transceiver coupled to the primary path component and the secondary path component; and a second transceiver coupled to the switching circuit.

Abstract: A method for reducing the number of the times of switching communication channels and a mobile device are provided. The method includes following steps: determining whether the mobile device is at a stationary state or a semi-stationary state according to a plurality of location information of the mobile device during a predetermined time interval; recognizing an area where the mobile device is located and a communication mode of the mobile device when the mobile device is at the stationary state or the semi-stationary state; establishing a transmission power variation table according to a plurality of transmission powers used by the mobile device at the communication mode; searching for a specific transmission power which is most frequently used from the transmission power variation table; increasing a lowest allowable transmission power of the mobile device to a target transmission power higher than the specific transmission power; and recording the target transmission power.

Abstract: An electronic device is provided. The An electronic device comprises a near field communication (NFC) circuit for transmitting a set of near field communication differential signals including a first differential signal and a second differential signal; a housing including a conducting portion with a ground point, a first side and a second side opposite to the first side; and two conductive arms. A current loop is formed by the conductive arm and the conducting portion, and a potential of the ground point is equal to a median potential of the current loop.