Abstract: A brazing joint, a brazing method, and a device for promoting solder rheology and gas overflow are provided. The brazing joint includes a first base metal, a second base metal, and a brazing seam located therebetween. The brazing seam is formed by filling a solder in a gap formed by welding surfaces of the first and the second base metal and melting it to connect the first and the second base metal. The brazing seam is a concave-shaped brazing seam. The gap defines a first distance and a second distance, the first distance is located at an edge of the gap, the second distance is located at the edge or an inside of the gap, the first distance is greater than the second distance, and a curved surface is formed between the location of the first distance and the location of the second distance for transition.

Abstract: A synthetic peptide sp4 has an amino acid sequence shown in SEQ ID NO: 1. As the sole effective ingredient in the antitumor efficacy test, it has a significant inhibitory effect on both the tumor volume and tumor weight of human osteosarcoma MG-63 in nude mice and has a significant dose-effect and time-effect relationship. There is no difference between the relative tumor growth rate T/C (%) of sp4 and that of the positive control group of Paclitaxel. The safety of sp4 is that its maximal tolerated dose for intravenous administration is 700 mg/kgBW. Sp4 has clear targets of pharmacological effects, while having efficacy in vivo, it also has an inhibitory effect on tumor telomerase, has an arrest on G1 phase of the tumor cell cycle, and inhibits the high expressions of tumor PD-L1 and CD47. The present disclosure relates to multiple uses of sp4, especially in the preparation of a class of antitumor drugs.

Abstract: The present disclosure relates to an electrolytic solution for a lithium-ion secondary battery including a solvent, additive, and lithium salt. The solvent includes carboxylic ester, and the additive includes fluorosulfonic acid lactone of Formula I in the description. In the electrolytic solution, a content W of carboxylic ester and a content a of fluorosulfonic acid lactone of Formula I satisfy 430.1>1000*a/W>0.163, optionally 202.02>1000*a/w?1.635, and further optionally 100.059?1000*a/w?4.915, where a and W are both in wt % based on a weight of the electrolytic solution. The secondary battery containing the electrolytic solution has excellent quick charging performance and a long cycle life.

Abstract: An electrolyte includes an electrolytic salt having a molar concentration greater than or equal to 1.4 mol/L and an additive including MSO3F (fluorosulfonate salt), where M is one or more metal ions selected from Li+, Na+, K+, Rb+, and Cs+.

Abstract: An electrolyte solution, a secondary battery, a battery module, a battery pack and a powered device are provided. In some embodiments, the electrolyte solution comprises an organic solvent and an additive, the organic solvent comprises a first organic solvent shown in Formula 1, and the additive comprises a first additive selected from one or more of compounds represented by Formula 2A and Formula 2B. In Formula 1, R1 and R2 are each independently one of C1-C3 alkyl and C1-C3 haloalkyl; in Formula 2A, R21, R22, R23, and R24 are each independently one of single bond and methylene; in Formula 2B, R31, R32, R33, and R34 are each independently one of a single bond and methylene, and R4 is one of a single bond, —O—, C1-C3 alkylene, C1-C3 haloalkylene, and C1-C3 oxaalkylene. The secondary battery of the present application has good fast charging performance while ensuring long cycle life and storage life.

Abstract: A lithium-ion battery and a battery module, a battery pack, and an electric apparatus containing the same are provided. The lithium-ion battery includes a positive electrode active material layer including a positive electrode active material and a pre-lithiation agent and an electrolyte including an additive, where the pre-lithiation agent is a lithium metal oxide pre-lithiation agent, the additive includes at least one of compound 1 shown in constitutional formula (I) and compound 2 shown in constitutional formula (II) below. In the following constitutional formula (I), R1 is an oxygen atom or methylene, and R2 is a hydrogen atom, a halogen atom, an alkyl group having 1 to 3 carbon atoms, a halogenated alkyl group having 1 to 3 carbon atoms.

Abstract: This application provides a secondary battery, including a positive electrode plate and an electrolytic solution. The positive electrode plate includes a positive current collector and a positive film layer. The positive film layer includes a positive lithium supplementing agent. The positive lithium supplementing agent is selected from LixTOy, where x?2, y?2, and T is a transition metal. The electrolytic solution includes a sulfide, and a valence of sulfur element in the sulfide is less than or equal to +4. The secondary battery according to this application achieves a high energy density and a high first-cycle Coulombic efficiency, improves a solid electrolyte interphase after being chemically formed and fully charged, achieves a low internal resistance of a battery cell, and can normally exert the capacity of the secondary battery.

Abstract: An electrochemical device includes a positive electrode plate and an electrolyte solution. The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer provided on at least one surface of the positive electrode current collector. The positive electrode active material layer contains a positive electrode lithium supplement including one or more of Li2M1O2, Li2M2O3, Li3M3O4, Li5M4O4, and Li6M5O4. M1 includes one or more of Ni, Co, Fe, Mn, Zn, Mg, Ca, and Cu. M2 includes one or more of Mn, Sn, Mo, Ru, and Ir. M3 includes one or more of V, Nb, Cr, and Mo. M4 includes one or more of Fe, Cr, V, and Mo. M5 includes one or more of Co, V, Cr, and Mo. The electrolyte solution contains a lithium salt. A molarity A of the lithium salt satisfies 1.5 mol/L?A?4 mol/L.

Abstract: The present application provides a positive electrode sheet which may include a current collector and a positive film layer provided on at least one surface of the current collector. The positive film layer may include a lithium manganese oxide in which a trivalent manganese element and a tetravalent manganese element may coexist and a high-oxidizability additive, and the high-oxidizability additive being used to oxidize Mn2+ to Mn3+ and/or Mn4+.

Abstract: The present application provides a secondary battery. The secondary battery may include a positive electrode sheet, a negative electrode sheet, and an electrolytic solution, where the positive electrode sheet may include a positive active material; in the positive active material, a contained rate of an element Co may satisfy: Co?0.09, and a content of an element Al may satisfy: 500 ppm?Al?10000 ppm; and the electrolytic solution may include a compound represented by the following general formula (I).

Abstract: A fusion protein, an amino acid sequence thereof, a coding nucleotide sequence thereof, a preparation method thereof and a use thereof are in the technical field of agricultural biotechnology. The fusion protein contains or consists of at least three, four, five, six, seven, or eight same and/or different PAMP (Pathogen-Associated Molecular Pattern) polypeptides. Optionally, there is at least one linker or no linker between two adjacent PAMP polypeptides. A plurality of PAMP polypeptides are assembled into the fusion protein having multiple immune epitopes. The fusion protein may induce defense immune responses of plants, weaken infestation ability of pathogenic microorganisms and substantially improve the disease resistance of plants. The method for preparing the fusion protein combines technologies of PTI (PAMP-Triggered Immunity) mechanism and gene engineering to obtain the fusion protein having multiple immune epitopes can be used in preparation of plant immune PAMP polypeptides.

Abstract: Provide are a liquid crystal compound represented by formula I, and a liquid crystal mixture comprising the compound A lateral trifluoromethyl-containing liquid crystal compound having the structural characteristics of Formula I not only has a negative dielectric anisotropy (??), an appropriate optical anisotropy (?n), a higher clearing point (CP), a prominent low-temperature miscibility with other liquid crystals, and a low rotary viscosity (?1), but also has a good stability to UV and high temperatures, particularly, a negative dielectric anisotropy. Same can be applied to the formulation of liquid crystal compositions of positive and negative types, and it is particularly prominent that same has the advantages of a good solubility at low temperatures and a high transmittance.

Abstract: A stabilizer represented by formula I, wherein M represents cyclopentyl, cyclobutyl or cyclopropyl; Z1 and Z2 each independently represent a single bond, —CH2—, —CH2CH2—, —O—, —CH2O—, —OCH2— or —COO—; represents one or two of and n represents 0, 1 or 2.

Abstract: Provided is a liquid crystal compound represented by formula I, the compound having a positive dielectric anisotropy, a great elastic constant and a good solubility. Further provided is a liquid crystal composition comprising the liquid crystal compound represented by formula I, the liquid crystal composition having a good stability against light and heat, a lower viscosity, a wider refractive index that may be achieved by the adjustment of the monomer ratio, and a higher clearing point (a very wide service temperature range), and in particular, the liquid crystal composition has a higher light transmittance, thus allowing a display device to have a higher brightness or an energy saving effect.

Abstract: Provide are a liquid crystal compound represented by formula I, and a liquid crystal mixture comprising the compound A lateral trifluoromethyl-containing liquid crystal compound having the structural characteristics of Formula I not only has a negative dielectric anisotropy (??), an appropriate optical anisotropy (?n), a higher clearing point (CP), a prominent low-temperature miscibility with other liquid crystals, and a low rotary viscosity (?1), but also has a good stability to UV and high temperatures, particularly, a negative dielectric anisotropy. Same can be applied to the formulation of liquid crystal compositions of positive and negative types, and it is particularly prominent that same has the advantages of a good solubility at low temperatures and a high transmittance.

Abstract: Provided is a liquid crystal compound represented by formula I, the compound having a positive dielectric anisotropy, a great elastic constant and a good solubility. Further provided is a liquid crystal composition comprising the liquid crystal compound represented by formula I, the liquid crystal composition having a good stability against light and heat, a lower viscosity, a wider refractive index that may be achieved by the adjustment of the monomer ratio, and a higher clearing point (a very wide service temperature range), and in particular, the liquid crystal composition has a higher light transmittance, thus allowing a display device to have a higher brightness or an energy saving effect.

Abstract: Disclosed is a novel stabilizer represented by formula I, Further disclosed is a liquid crystal composition comprising a compound of formula I. The liquid crystal composition disclosed in the present invention has a low viscosity ?1, a moderate dielectric anisotropy ??, a moderate optical anisotropy ?n, and most principally a high reliability, and can achieve a quick response of liquid crystal display.