Abstract: A combined catalytic viscosity reducing system includes a catalyst slug, a heat generating system slug, a gas injection slug, and a water-soluble viscosity reducing system slug. The catalyst slug includes 10%-15% of azacarbene iron, 15%-30% of tert-butyl hydroperoxide, 2%-5% of phosphoric acid, 2%-5% of hydrogen donor, and 0.5%-1% of emulsifier agent, and the others are solvent. The heat generating system slug includes 10%-30% of NaNO2, 8%-25% of NH4Cl, and 3%-10% of acid initiator, and the others are water, totaling 100%. The water-soluble viscosity reducing system slug, according to mass percentage, includes 0.2%-0.5% of surfactant and 2%-10% of alkali, and the others are water. The combined catalytic viscosity reducing system can effectively reduce viscosity without injecting steam, and the viscosity reduction rate can reach 96.5%.

Abstract: A data retransmission method is provided herein. The method includes sending a data frame to an electronic device and receiving an acknowledgement frame from the electronic device within a transmission opportunity duration, where the acknowledgement frame includes first acknowledgement information; and when the first acknowledgement information indicates that at least a part of data in the data frame needs to be retransmitted and further indicates a retransmission period required to complete the retransmission, retransmitting information related to the at least the part of the data to the electronic device in the retransmission period.

Abstract: Provided is a gas water heater. The gas water heater includes a pre-mixer, a combustor having a combustion chamber in communication with a premixing chamber, a condensate water assembly configured to receive and discharge condensate water, and an apparatus for controlling the gas water heater. The pre-mixer includes a premixing chamber and an air intake fan that is configured to supply air to the combustion chamber. The air intake fan is disposed in the premixing chamber. The method includes: acquiring an intake air pressure threshold; acquiring an air intake pressure value of the air intake fan; and controlling, in response to determining based on the air intake pressure value and the intake air pressure threshold that a water seal of the condensate water assembly is at risk of being blown away, the gas water heater to stop operation.

Abstract: A non-coherent long range (LoRa) communication system based on multiple-input multiple-output (MIMO) technology, including a transmitter and a receiver. The transmitter is configured to transmit signals to the receiver, and the receiver is configured to receive and demodulate the signals. The transmitter includes a bit-symbol converter, a space-time mapper, and a plurality of transmitting antennas. The space-time mapper is configured to select a transmit antenna for the signal in each transmission time slot and transmit a base Chirp signal x0 and the modulating signal xm to the receiver in different time slots. The receiver includes a plurality of receiving antennas. The receiving antenna is configured to preprocess the signal to obtain a first cache matrix and a second cache matrix. After Hadamard product operation is performed on the first and second cache matrixes, operation results of the receiving antennas are accumulated and demodulated to output demodulated information bits.

Abstract: A system and a method for downloading an application program of an industrial electric vehicle driver are provided. The system includes a downloader, a USB/CAN bus converter and a plurality of drivers. The system is capable of implementing concurrent simultaneous downloads of driver application programs in an online multi-channel and multi-node per channel manner. The downloader and the fully automatic downloading method help to improve the quality of the products leaving the factory and maintain the consistency of the products, thereby not only greatly enhancing product production efficiency and customer satisfaction, but also greatly reducing labor intensity, with significant economic and social benefits.

Abstract: The present invention relates to the field of digital signal processing, and in particular to a Costas sequence time-frequency joint synchronization method based on all-phase spectrum correction. The method improves the defects existing in a discrete frequency spectrum correction algorithm using short-time Fourier transform and sliding correlation. The improvement mainly comprises: the present disclosure provides a solution based on iterative optimization: when an actual frequency offset is an integral multiple of the spectral resolution, a large error can occur, frequency offset correction and time delay correction are carried out on a signal by using an estimated value having a large estimated error, then estimation is carried out again, and the frequency offset of the signal is not a special value by means of an iteration mode.

Abstract: A system and a method for downloading an application program of an industrial electric vehicle driver are provided. The system includes a downloader, a USB/CAN bus converter and a plurality of drivers. The system is capable of implementing concurrent simultaneous downloads of driver application programs in an online multi-channel and multi-node per channel manner. The downloader and the fully automatic downloading method help to improve the quality of the products leaving the factory and maintain the consistency of the products, thereby not only greatly enhancing product production efficiency and customer satisfaction, but also greatly reducing labor intensity, with significant economic and social benefits.

Abstract: The present invention relates to the field of digital signal processing, and in particular to a Costas sequence time-frequency joint synchronization method based on all-phase spectrum correction. The method improves the defects existing in a discrete frequency spectrum correction algorithm using short-time Fourier transform and sliding correlation. The improvement mainly comprises: the present disclosure provides a solution based on iterative optimization: when an actual frequency offset is an integral multiple of the spectral resolution, a large error can occur, frequency offset correction and time delay correction are carried out on a signal by using an estimated value having a large estimated error, then estimation is carried out again, and the frequency offset of the signal is not a special value by means of an iteration mode.

Abstract: antennas. The receiving antenna is configured to preprocess the signal to obtain a first cache matrix and a second cache matrix. After Hadamard product operation is performed on the first and second cache matrixes, operation results of the receiving antennas are accumulated and demodulated to output demodulated information bits.

Abstract: A differential chaos shift keying communication method based on hybrid index, including: modulating a transmitted signal based on the hybrid index; and demodulating a received signal based on the hybrid index. The hybrid index is a hybrid index bit, which includes a carrier index bit and a carrier number index bit. This application also provides a system for implementing the differential chaos shift keying communication method, which includes a transmitter and a receiver.

Abstract: A differential chaos shift keying communication method based on hybrid index, including: modulating a transmitted signal based on the hybrid index; and demodulating a received signal based on the hybrid index. The hybrid index is a hybrid index bit, which includes a carrier index bit and a carrier number index bit. This application also provides a system for implementing the differential chaos shift keying communication method, which includes a transmitter and a receiver.

Abstract: The present invention discloses a method for diagnosing SARS-CoV-2 infection by detecting SARS-CoV-2 specific IgA in saliva. The diagnosis method can be any method capable of detecting IgA, such as ELISA, co-immunoprecipitation, chemiluminescence and colloidal gold method. The present invention proves that SARS-CoV-2 specific IgA exists in the saliva of COVID-19 patients, which can be used for clinical diagnosis of SARS-CoV-2 infection.

Abstract: A new waterproof electronic scale device is proposed, which includes a casing/body/frame and a plurality of internal components and/or circuitries encapsulated within the casing of the electronic scale device. At least a portion of the internal components are coated with a layer of polymer nanometer (or nano) water-resistant material, which is water and oil proof. The layer of nano-coating material is so applied to the surface of the internal components that it effectively protects the coated internal components from being damaged by liquid infiltration, such as infiltration by moisture or oil content, into the electronic scale device.

Abstract: A heated non-contact wafer handling gripper may heat a thin device wafer bottom surface having a temporary bonding adhesive residue after debonding of the device wafer from a carrier along a layer of temporary bonding adhesive that bonds the wafers. The gripper may heat residue of the adhesive that remains on the bottom surface while gripping, transferring and placing the wafer onto an adhesive cleaning chuck. The heated adhesive cleaning chuck may heat the thin device wafer bottom surface having the adhesive residue after being placed on the chucks. The chuck may heat the residue of the adhesive while the residue is cleaned from the wafer. Due to the heating by the chuck and/or gripper, wafer warpage and associated problems due to cooling of the residue may be eliminated or acceptable for wafer handling and adhesive cleaning.

Abstract: A heated non-contact wafer handling gripper may heat a thin device wafer bottom surface having a temporary bonding adhesive residue after debonding of the device wafer from a carrier along a layer of temporary bonding adhesive that bonds the wafers. The gripper may heat residue of the adhesive that remains on the bottom surface while gripping, transferring and placing the wafer onto an adhesive cleaning chuck. The heated adhesive cleaning chuck may heat the thin device wafer bottom surface having the adhesive residue after being placed on the chucks. The chuck may heat the residue of the adhesive while the residue is cleaned from the wafer. Due to the heating by the chuck and/or gripper, wafer warpage and associated problems due to cooling of the residue may be eliminated or acceptable for wafer handling and adhesive cleaning.

Abstract: A Sagnac interferometer can include a beamsplitter arranged to receive an input beam of light of a design wavelength, to split the input beam of light into first and second beams that counter propagate around an optical path, and to recombine the first and second beams into an output beam of light. The optical path can include at least one diffraction grating that is arranged to satisfy an effective Littrow geometry.

Abstract: A Sagnac interferometer can include a beamsplitter arranged to receive an input beam of light of a design wavelength, to split the input beam of light into first and second beams that counter propagate around an optical path, and to recombine the first and second beams into an output beam of light. The optical path can include at least one diffraction grating that is arranged to satisfy an effective Littrow geometry.