Abstract: A memory device is disclosed, comprising a 4T-SRAM cell and a sensing circuit. The 4T-SRAM cell comprising two P-type MOSFET devices for a data bit storage and two N-type MOSFET devices for accessing switches has benefits of less numbers of MOSFET devices for smaller cell size and low leakage current. The sensing circuit comprises a switch device, a latch and a discharge device. The switch device coupled between the sensing latch and the ground voltage rail is designed to reduce the read disturbance to 4T SRAM cell from the sensing circuit by cutting the channel leakage current paths of NMOSFET transistors in the latch to the ground voltage rail. The differential voltage signals for the reading digital data stored in 4T SRAM cells are enhanced by increasing the sensing period. The read margins for 4T SRAM are then greatly improved leading to excellent reliable reading.

Abstract: A non-differential sensing circuit for semiconductor Non-Volatile Memories (NVMs) is disclosed. The circuit comprises a half latch, a switch device, a reset device, a PMOSFET device and an NMOSFET device. The half latch has a voltage signal input node and a digital voltage signal output node. The PMOSFET device has a source connected to a digital voltage rail and a drain connected to the voltage signal input node. The NMOSFET device has a drain connected to the gate of the PMOSFET device, a gate applied with a bias voltage and a source connected to a bitline read path. The circuit is tuned to threshold voltages of the PMOSFET device and the NMOSFET device for sensing the threshold voltage of a NVM cell. By sensing threshold voltage states of the NVM cell, a bit information stored in the NVM cell can be fast determined.

Abstract: Provided is a DNA polymerase mutant for sequencing. The DNA polymerase mutant includes: compared with a Pyrococcus abyssi DNA polymerase exo-mutant, at least three amino acid mutations in the following four sites or functionally equivalent sites: position 409, position 410, position 411, and position 486. The Pyrococcus abyssi DNA polymerase exo-mutant has an amino acid sequence as set forth in SEQ ID NO: 1.

Abstract: Disclosed is a valve mechanical linkage system. A valve comprises a main valve and a secondary valve; the system comprises a first transmission mechanism and a second transmission mechanism; the first transmission mechanism is connected with the main valve and used for converting the up-and-down reciprocating motion of the main valve into a rotational reciprocating motion; the first transmission mechanism and the second transmission mechanism are connected by means of a coupling (4), and the rotational force of the rotational reciprocating motion is transferred to the second transmission mechanism by means of the coupling (4); the second transmission mechanism is connected with the secondary valve, and achieves on-off control on the secondary valve by converting the rotational reciprocating motion into the up-and-down reciprocating motion.

Abstract: The present disclosure provides a method for modeling, including: S1): designing a test key having a source, a drain, and a gate, and testing the test key to obtain test data; S2): extracting a model parameter according to the test data; S3): verifying reasonableness of a physical characteristic of the model parameter based on a relationship between a source-drain voltage and a drain current, if the reasonableness passes the verification, a model file is established and the method proceeds to S4), if the reasonableness fails the verification, the method returns to S2) to adjust the model parameter, until the reasonableness passes the verification; S4): performing quality assurance on the model file, if the model file passes the quality assurance, the modeling is completed, if the model file fails the quality assurance, the method returns to S2) to adjust the model parameter until the model file passes the quality assurance.

Abstract: A double-plate gate valve includes a valve body, a valve cover, a valve stem, a guide plate, a goggle plate assembly, a diversion hole assembly, a disc spring assembly and a valve plate and wedge assembly. The goggle plate assembly provides mounting support for the diversion hole assembly and the valve plate and wedge assembly in the valve chamber, the goggle plate assembly is movable along with the diversion hole assembly and the valve plate and wedge assembly in the valve chamber, and floating seals are formed at a contact surface between the diversion hole assembly and the guide plate, and at a contact surface between the valve plate and wedge assembly and the guide plate. A face-to-face distance and a sealing force between a sealing surface of the diversion hole assembly and a sealing surface of the valve body are adjustable.

Abstract: A double-plate gate valve includes a valve body, a valve cover, a valve stem, a guide plate, a goggle plate assembly, a diversion hole assembly, a disc spring assembly and a valve plate and wedge assembly. The goggle plate assembly provides mounting support for the diversion hole assembly and the valve plate and wedge assembly in the valve chamber, the goggle plate assembly is movable along with the diversion hole assembly and the valve plate and wedge assembly in the valve chamber, and floating seals are formed at a contact surface between the diversion hole assembly and the guide plate, and at a contact surface between the valve plate and wedge assembly and the guide plate. A face-to-face distance and a sealing force between a sealing surface of the diversion hole assembly and a sealing surface of the valve body are adjustable.

Abstract: Disclosed is a valve mechanical linkage system. A valve comprises a main valve and a secondary valve; the system comprises a first transmission mechanism and a second transmission mechanism; the first transmission mechanism is connected with the main valve and used for converting the up-and-down reciprocating motion of the main valve into a rotational reciprocating motion; the first transmission mechanism and the second transmission mechanism are connected by means of a coupling (4), and the rotational force of the rotational reciprocating motion is transferred to the second transmission mechanism by means of the coupling (4); the second transmission mechanism is connected with the secondary valve, and achieves on-off control on the secondary valve by converting the rotational reciprocating motion into the up-and-down reciprocating motion.

Abstract: A method for data synchronization performed by a server is described. The method comprises receiving, from a client terminal, a synchronization request and information about a synchronization anchor of the client terminal; determining, based on the synchronization anchor of the client terminal and a synchronization anchor of the server, difference data to be synchronized with the client terminal; determining whether a size of the difference data exceeds a threshold; and responsive to determining that a size of the difference data exceeds the threshold, transmitting the difference data to the client terminal in a plurality of difference data segments, wherein a size of each of the plurality of the difference data segments does not exceed the threshold, and wherein each of the plurality of the difference data segments is to be synchronized separately with the client terminal.

Abstract: A method for data synchronization performed by a server is described. The method comprises receiving, from a client terminal, a synchronization request and information about a synchronization anchor of the client terminal; determining, based on the synchronization anchor of the client terminal and a synchronization anchor of the server, difference data to be synchronized with the client terminal; determining whether a size of the difference data exceeds a threshold; and responsive to determining that a size of the difference data exceeds the threshold, transmitting the difference data to the client terminal in a plurality of difference data segments, wherein a size of each of the plurality of the difference data segments does not exceed the threshold, and wherein each of the plurality of the difference data segments is to be synchronized separately with the client terminal.