Abstract: The present application provides a secondary battery and a battery module, battery pack and electrical device containing the same. The secondary battery comprises a positive electrode plate and an non-aqueous electrolytic solution, wherein the positive electrode plate comprises a positive electrode active material with a core-shell structure, said positive electrode active material comprising an core and a shell covering said core, said core has a chemical formula of Li1+xMn1-yAyP1-zRzO4; said shell comprises a first cladding layer covering said core, a second cladding layer covering said first cladding layer and a third cladding layer covering said second cladding layer, said non-aqueous electrolytic solution comprises a first additive, said first additive comprises one or more of compounds as shown by Formula 1, Formula 2 and Formula 3.

Abstract: An optical millimeter wave terahertz transfer system and transfer method are disclosed. The device comprises a local terminal, a transfer link, an access terminal, and a user terminal. By using the device in the transfer link, optical signals transferred forward and backward are extracted through optical couplers, and millimeter wave terahertz signals with a stable phase are obtained at any position in the transfer link through optical signal filtering, photovoltaic conversion, microwave filtering, frequency division and optical frequency shift processing. The device and method have the characteristics of high reliability, simple structure, and low implementation cost.

Abstract: This application provides a secondary battery, a battery module, a battery pack, and an electric apparatus. The secondary battery includes a positive electrode plate and a non-aqueous electrolyte. The positive electrode plate includes a positive electrode active material having a core-shell structure, the positive electrode active material including a core and a shell enveloping the core. A chemical formula of the core is Li1+xMn1?yAyP1-zRzO4. A is one or more elements selected from Zn, Al, Na, K, Mg, Mo, W, Ti, V, Zr, Fe, Ni, Co, Ga, Sn, Sb, Nb and Ge. R is one or more elements selected from B, Si, N, and S. The first coating layer includes a crystalline pyrophosphate LiaMP2O7 and/or Mb(P2O7)c. The second coating layer includes a crystalline phosphate XPO4. The third coating layer is carbon. The non-aqueous electrolyte includes a first solvent, the first solvent including one or more of the compounds represented by formula 1.

Abstract: A secondary battery includes a positive electrode plate and a non-aqueous electrolyte. The positive electrode plate includes a positive electrode active material including a core and a shell enveloping the core. A chemical formula of the core is Li1+xMn1?yAyP1?zRzO4, where the first coating layer includes a crystalline pyrophosphate LiaMP2O7 and/or Mb(P2O7)c, the second coating layer includes a crystalline phosphate XPO4, and the third coating layer is carbon. The non-aqueous electrolyte includes a first additive including one or more selected from a group consisting of compounds represented by formula 1 and compounds represented by formula 2.

Abstract: The present application provides a secondary battery and a battery module, battery pack and electrical device containing the same. The secondary battery comprises a positive electrode plate and an non-aqueous electrolytic solution, wherein the positive electrode plate comprises a positive electrode active material with a core-shell structure, said positive electrode active material comprising an core and a shell covering said core, said core has a chemical formula of Li1+xMn1-yAyP1-zRzO4; said shell comprises a first cladding layer covering said core, a second cladding layer covering said first cladding layer and a third cladding layer covering said second cladding layer, said non-aqueous electrolytic solution comprises a first additive, said first additive comprises one or more of compounds as shown by Formula 1, Formula 2 and Formula 3.

Abstract: Disclosed is a porous silicon negative electrode material, comprising a sparse-silicon inner core, and a transition ring, a dense-silicon ring and a carbon coating layer which are sequentially coated on the surface of the sparse-silicon inner core. In the sparse-silicon inner core, the transition ring and the dense-silicon ring, the porosity sequentially decreases, and the silicon density sequentially increases. Further disclosed are a negative electrode sheet and a lithium-ion battery which are prepared from the described porous silicon negative electrode material. The porous silicon negative electrode material of the present disclosure effectively reduces the expansion and contraction stress of the electrode material during cycle and slows down the capacity attenuation, and thus the battery capacity retention rate is high, and the cycle performance is stable.

Abstract: A secondary battery, a battery module, a battery pack, and an electric device. The secondary battery includes a cathode piece and a non-aqueous electrolyte, in which, the cathode piece includes a cathode active material, and the cathode active material has a chemical formula represented by LiaAxMn1-yByP1-zCzO4-nDn; the non-aqueous electrolyte includes a first lithium salt and a first additive, optionally, the first lithium salt is one or more selected from the group consisting of LiN(CmF2m+1SO2)(CnF2n+1SO2) and Li(FSO2)2N, m and n represent positive integers; the first additive includes one or more of a compound represented by Formula 1. Using the cathode active material and/or a combination of the cathode active material and the non-aqueous electrolyte improves the rate performance, cycle performance, and high temperature stability of the lithium manganese phosphate secondary battery.

Abstract: The present disclosure provides a porous silicon-carbon anode electrode material. The anode electrode material has a core-shell structure and the core-shell structure sequentially includes a porous sparse silicon-carbon core, a transition layer, a dense silicon-carbon layer, and a carbon coating layer from inside to outside. Porous carbon of the porous silicon-carbon anode electrode material in the present disclosure has a porous gap structure. Metal elements doped in the porous carbon with the silicon particles distributed in the gaps of the carbon skeleton structure, the carbon coating layer, and the dense carbon layer have good electrical conductivity, which may improve the conductivity of the material.

Abstract: A method and a circuit for driving a display panel, and a display device are disclosed. The display panel includes rows of sub-pixels. The method includes a display process, which includes: generating an initial driving signal for each row of sub-pixels according to image information of an image to be displayed; adjusting the initial driving signal for each row of sub-pixels according to a compensation gain of each row of sub-pixels, so as to obtain a target driving signal, the compensation gain of each row of sub-pixels is an actual brightness coefficient of the row of sub-pixels with respect to a reference row of sub-pixels during the display panel displaying an image with a test gray scale; and driving each row of sub-pixels to display according to the target driving signal for the row of sub-pixels, so as to enable each row of sub-pixels to reach target brightness.

Abstract: Provided are a method for driving a display panel, and a display device. The method includes: obtaining a gray scale value of each sub-pixels in a current row and a gray scale value of each sub-pixels in a previous row; determining a target gray scale value of each sub-pixel in the current row according to the gray scale value of each sub-pixel in the current row, the gray scale value of each sub-pixel in the previous row, and a target compensation value in a predetermined target compensation lookup table; and inputting a data voltage into a data line in the display panel according to the target gray scale value of each sub-pixel in the current row, to charge with a corresponding data voltage to each sub-pixel in the current row.

Abstract: Provided are a secondary battery, a battery module, a battery pack, and an electric device. The secondary battery includes: a positive electrode sheet and a non-aqueous electrolyte, where the positive electrode sheet includes a cathode active material with a core-shell structure, and the cathode active material includes a core and a shell covering the core; the core has a chemical formula of Li1+xMn1-yAyP1-zRzO4; where the first coating layer includes a crystalline pyrophosphate LiaMP2O7 and/or a crystalline pyrophosphate Mb(P2O7)c, the second coating layer includes a crystalline phosphate XPO4, and the third coating layer is carbon; and the non-aqueous electrolyte includes a first lithium salt and a first additive, where the first lithium salt includes one or more selected from the group consisting of LiN(CmF2m+1SO2)(CnF2n+1SO2) and Li(FSO2)2N, where m and n each are a positive integer.

Abstract: The disclosure belongs to the technical field of secondary batteries, and in particular, relates to a cell, including: a first separator, a positive electrode plate, a second separator and a negative electrode plate, wherein the first separator, the positive electrode plate, the second separator and the negative electrode plate are stacked in sequence to form a composite electrode plate, and the composite electrode plate is wound to obtain the cell; the cell includes a straight portion and corner portions arranged at two ends of the straight portion, and at least one surface of the positive electrode plate located at the corner portion is provided with a positive electrode buffer coating and/or at least one surface of the negative electrode plate located at the corner portion is provided with a negative electrode buffer coating.

Abstract: A chip-scale silicon-based hybrid-integrated LiDAR system, wherein a transmitting end thereof sequentially comprises a narrow-linewidth tunable laser source, a silicon-nitride-based beam splitter, a silicon-based phase shifter array and a silicon-nitride-based unidirectional transmitting antenna array w.r.t the optical path. Based on the principle of reciprocity of light propagation, the receiving end thereof sequentially comprises a silicon nitride unidirectional receiving antenna array, a silicon nitride beam splitter and a silicon-based coherent receiving module. It also comprises a backup system and an electric controller as the driver of the phase shifters and the processing module. Modules on the silicon platform and the silicon nitride platform are monolithic integrated in a multilayer sandwiched fashion by means of a tapered silicon/silicon nitride evanescent inter-layer coupler; and a gain chip in the tunable laser module and a silicon nitride waveguide are hybrid-integrated by horizontal coupling.

Abstract: A silicon-based reconfigurable microwave photonic multi-beam forming network chip comprises an optical fiber coupler, an optical switch array, an optical divider, an ultra-wideband continuously adjustable optical true delay line array and a detector array; the optical fiber coupler is configured for inputting a single-sideband modulated optical signal of a microwave photonic phased array radar; the optical switch array and optical divider are configured for forming the reconstruction of the number of array elements used for a microwave photonic multi-beam and a microwave photonic single-beam; the ultra-wideband continuously adjustable optical true delay line array is configured for independently adjusting the delay on each microwave array element; and the detector array is configured for outputting a microwave signal. The chip provides large instantaneous bandwidth, high resolution, and reconfigurable microwave photonic multi-beam forming for the microwave photonic phased array radar.

Abstract: A three-dimensional scanning LiDAR based on one-dimensional optical phased arrays comprises a transmitting end, a coherent receiving end and an incoherent receiving end, wherein the transmitting end, the coherent receiving end and the incoherent receiving end are all one-dimensional arrays. A phase control complexity of the three-dimensional scanning phased array is reduced, and a tunable laser with high cost and a grating array antenna with large crosstalk are avoided. The LiDAR provides pure solid-state three-dimensional scanning in speed and integration level and is highly practical.

Abstract: A polynucleotide having promoter activity of a malate dehydrogenase gene (mdh gene), a transcription expression cassette, recombinant expression vector and recombinant host cell containing the polynucleotide having the promoter activity, a method for constructing a promoter mutant, a method for regulating the transcription of a target gene, a method for preparing a protein, and method for producing a target compound. The polynucleotide having the promoter activity is a mutant of an mdh gene promoter, and compared with a promoter of a wild-type mdh gene, the promoter activity of the mutant is significantly improved. After operably linking the mutant to a target gene, the expression efficiency of the target gene can be significantly improved, thereby effectively improving the yield and transformation rate of a target compound.

Abstract: A protein having an L-proline efflux function and the use thereof are provided. A method for producing L-proline or hydroxyproline by means of using a protein ThrE is used for producing L-proline by means of enhancing the activity of a polypeptide, having an L-proline efflux function, in an L-proline-producing strain. Alternatively, the method is used for producing hydroxyproline by means of weakening the activity of a polypeptide, having an L-proline efflux function, in L-proline-producing host cells and enhancing the activity of a proline hydroxylase.

Abstract: Integrated two-dimensional multi-beam LiDAR transmitter based on the Butler matrix, comprising an tunable laser array, a frequency modulated continuous wave modulator array, an N×N Butler optical matrix network, an N×M optical beam expanding network, an M-path phase shifter array, and an M-path two-dimensional LiDAR emitters.

Abstract: Provided are a polynucleotide having promoter activity and an application of the polynucleotide in producing an amino acid. Also disclosed are a transcription expression cassette, a recombinant expression vector, and a recombinant host cell which contain the polynucleotide, and a method for enhancing expression of a target gene, a method for preparing a protein, and a method for producing an amino acid. The polynucleotide having the promoter activity is a mutant of a polynucleotide having the sequence as shown in SEQ ID NO: 9. Compared with the polynucleotide having the sequence as shown in SEQ ID NO: 9, the promoter activity of the mutant is significantly enhanced, thereby promoting the stable and efficient expression of the target gene.

Abstract: The present invention relates to the technical field of medicines, and relates to a polyethylene glycol conjugated drug, a preparation method therefor and the use thereof. In particular, the present invention relates to a polyethylene glycol conjugated drug as shown in formula I or a pharmaceutically acceptable salt thereof. The present invention also relates to a method for preparing the polyethylene glycol conjugated drug or the pharmaceutically acceptable salt thereof, a pharmaceutical composition comprising the polyethylene glycol conjugated drug or the pharmaceutically acceptable salt thereof, and the use thereof in the preparation of a drug.