Abstract: The disclosure relates to an offline-online question answering system. In some aspects, the techniques described herein relate to a method including: receiving, by a processor, a query from a user; generating, by the processor, a query embedding representing the query; identifying, by the processor, at least one question corresponding to the query by comparing the query embedding to a plurality of embeddings of questions; and transmitting, by the processor, an answer corresponding to the at least one question to the user in response to the query.

Abstract: Disclosed is a tea leaf and tea stem separating device. The tea leaf and tea stem separating device comprises a machine shell, wherein a collecting mechanism, a peeling mechanism, a separating mechanism, a rocker mechanism and recycling mechanisms are sequentially arranged on the machine shell in the falling direction of materials, a driving mechanism is arranged at the position, corresponding to the separating mechanism, of the inner wall of the machine shell, the driving mechanism is provided with a conveyor belt mechanism connected with the peeling mechanism, the separating mechanism and the rocker mechanism, and the driving mechanism can drive the conveyor belt mechanism to move so as to pull the peeling mechanism, the separating mechanism and the rocker mechanism to synchronously reciprocate.

Abstract: Disclosed is a tea leaf and tea stem separating device. The tea leaf and tea stem separating device comprises a machine shell, wherein a collecting mechanism, a peeling mechanism, a separating mechanism, a rocker mechanism and recycling mechanisms are sequentially arranged on the machine shell in the falling direction of materials, a driving mechanism is arranged at the position, corresponding to the separating mechanism, of the inner wall of the machine shell, the driving mechanism is provided with a conveyor belt mechanism connected with the peeling mechanism, the separating mechanism and the rocker mechanism, and the driving mechanism can drive the conveyor belt mechanism to move so as to pull the peeling mechanism, the separating mechanism and the rocker mechanism to synchronously reciprocate.

Abstract: A data transmission method and a system thereof are provided according to the disclosure. A first type is determined for the data to be transmitted by the first data terminal in the local area network, data of the first type stored in all data terminals in the local area network is detected and is transmitted to the server in accordance with the first predetermined rule, where the first terminal is any one of the data terminals in the local area network.

Abstract: A data transmission method and a system thereof are provided according to the disclosure. A first type is determined for the data to be transmitted by the first data terminal in the local area network, data of the first type stored in all data terminals in the local area network is detected and is transmitted to the server in accordance with the first predetermined rule, where the first terminal is any one of the data terminals in the local area network.

Abstract: A hybrid broadband power amplifier module design is disclosed. In a power amplifier design, low impedance transmission lines are typically needed at the input and output of the transistor to match for its optimum source and load impedance. The peripheral of the GaN (Gallium Nitride) transistor is very small due to the high power density of the GaN transistor. The transmission line, for example a microstrip line, needs to be very wide to achieve low impedance on ceramic substrates such as Alumina. The dimensional mismatch from the low impedance transmission line to the transistor causes additional parasitic effect to the matching networks and limits the bandwidth of the amplifier. Capacitor materials are typically very high in dielectric constant; hence a single layer capacitor with small dimensions equalizes to a low impedance transmission line. Selected capacitors with proper dimensions can be used as the low impedance transmission lines in the matching networks.

Abstract: A broadband power amplifier using a novel high power feedback structure is disclosed in this patent. Feedback is widely used in amplifier design to broaden the bandwidth of the amplifier. Traditionally, the feedback resistor is either an axial resistor placed over the top of the transistor or a surface mount resistor with a long PCB trace making up the rest of the feedback path. However, each of these methods has it's limitations. The axial resistor doesn't have good heat sinking capability and therefore cannot handle high power. The feedback on PCB makes the feedback path long and becomes positive feedback at high frequency, thus limiting the high end frequency of operation of the amplifier in a stable region. The feedback structure disclosed in this patent has a good heat sinking path, has very short feedback path; allowing for higher frequency operation.

Abstract: A broadband power combining device includes an input port, an input waveguide section, a center waveguide section formed by stacked wedge-shaped trays, an output waveguide section, and an output port. Each tray is formed of a wedge-shaped metal carrier, an input antipodal finline structure, one or more active elements, an output antipodal finline structure, and attendant biasing circuitry. The wedge-shaped metal carriers have a predetermined wedge angle and predetermined cavities. The inside and outside surfaces of the metal carriers and surfaces of the cavity all have cylindrical curvatures. When the trays are assembled together, a cylinder is formed defining a coaxial waveguide opening inside. The antipodal finline structures form input and output arrays.