Abstract: The current invention provides for methods of promoting differentiation of human pluripotent stem cells into esophageal progenitor cells as well as the cells obtained from the methods, solutions, compositions, and pharmaceutical compositions comprising such cells. The current invention also provides for methods of using the esophageal progenitor cells for treatment and prevention of disease, and kits.

Abstract: A system for synchronously recovering nitrogen and carbon dioxide from boiler flue gas includes: a flue gas pretreatment system used for dehydrating and cooling boiler flue gas; a carbon and nitrogen separation system communicated with the flue gas pretreatment system, and used for performing pressure swing adsorption on the pretreated flue gas and separating the nitrogen-containing vent gas and the crude carbon dioxide gas; a carbon dioxide secondary purification system communicated with the carbon and nitrogen separation system, and used for performing secondary purification on the crude carbon dioxide gas separated from the carbon and nitrogen separation system; and a nitrogen concentration and purification system communicated with the carbon and nitrogen separation system and the carbon dioxide secondary purification system, and used for purifying the nitrogen-containing vent gas separated from the carbon and nitrogen separation system and the vent gas generated by the carbon dioxide secondary purificatio

Abstract: What is described herein relates to a method for improving a cell culture comprising a) heating a cell culture process fluid using a single-use dense membrane hollow fiber module wherein said single-use dense membrane hollow fiber module comprises a plurality of dense membranes arranged as hollow fibers in a housing and/or b) wherein the cell culture has at least one cell culture chamber and at least the bottom or at least the top of said cell culture chamber is covered with an insulation.

Abstract: The present invention provides a multipole engine array system and a loudspeaker, the multipole engine array system comprising a plurality of engine assemblies distributed in an annular array, the plurality of engine assemblies being fixed inside the cylindrical loudspeaker by means of a mounting base provided in a housing of the cylindrical loudspeaker; each engine assembly comprises a magnetic conduction plate and a magnet provided in the magnetic conduction plate; a magnetic field is formed between the magnet and the magnetic conduction plate; and the plurality of engine assemblies are arranged coaxially and annularly along the periphery of the mounting base, so as to form a multipole magnetic field having a plurality of magnetic pole directions.

Abstract: The present invention provides a multi-engine array system and a loudspeaker. The multi-engine array system comprises at least two engine assemblies; the at least two engine assemblies are mounted, in an array, at the bottom of a basin stand of a loudspeaker, each of the engine assemblies comprises a voice coil configured with a voice coil skeleton and a magnetic circuit system which provides a magnetic field for the voice coil, the magnetic circuit system comprising a magnetic bowl, a magnet and a magnetic conductive plate, the magnetic bowl being mounted at the bottom of the basin stand, the magnet and the magnetic conductive plate being located within the magnetic bowl, a magnetic gap being formed between the magnetic bowl, the magnet and the magnetic conductive plate, the voice coil being suspended in the magnetic gap, and cross sections of the voice coil and the magnetic circuit system both being rectangular.

Abstract: Provided are a speaker unit and a speaker device. A main body of the speaker unit is a rectangular bowl-shaped structure, and comprises a suspension system, a magnetic circuit system having an annular magnetic gap, and a bowl-shaped frame connecting the suspension system and the magnetic circuit system. The bowl-shaped frame accommodates the suspension system and the magnetic circuit system. The magnetic circuit system is fixed to the interior of the bowl-shaped frame. The suspension system comprises a diaphragm and at least one voice coil connected to a bottom portion of the diaphragm. The magnetic circuit system comprises at least one magnetic circuit assembly matching the voice coil. One end of the voice coil is connected to the diaphragm by means of a voice coil frame. The other end of the voice coil is suspended within an annular magnetic gap of the magnetic circuit assembly.

Abstract: An injection method for a solid retarded acid includes mixing a solid acidic substance with a natural polymer, extruding through an extruder to produce particles; putting the produced particles in a coating pan, and sprinkling zinc acetate powder; turning on the coating pan to rotate while irradiating with an infrared lamp; spraying a glycolic acid aqueous solution with a spray gun, and continuing to rotate to obtain the solid retarded acid; injecting non-reactive liquid and the solid retarded acid into the a sand mixing truck; after the mixture is uniformly mixed in the sand mixing truck, injecting the mixture into a formation by a fracturing truck; conveying the solid retarded acid to a designated location, then stopping a pump, removing pipelines, and opening the well for gushing. The method is good in drag reduction, easy for flowback, thereby reducing the construction cost and facilitating environmental protection, and has broad application.

Abstract: The present invention provides a multipole engine array system and a loudspeaker, the multipole engine array system comprising a plurality of engine assemblies distributed in an annular array, the plurality of engine assemblies being fixed inside the cylindrical loudspeaker by means of a mounting base provided in a housing of the cylindrical loudspeaker; each engine assembly comprises a magnetic conduction plate and a magnet provided in the magnetic conduction plate; a magnetic field is formed between the magnet and the magnetic conduction plate; and the plurality of engine assemblies are arranged coaxially and annularly along the periphery of the mounting base, so as to form a multipole magnetic field having a plurality of magnetic pole directions.

Abstract: Provided are a speaker unit and a speaker device. A main body of the speaker unit is a rectangular bowl-shaped structure, and comprises a suspension system, a magnetic circuit system having an annular magnetic gap, and a bowl-shaped frame connecting the suspension system and the magnetic circuit system. The bowl-shaped frame accommodates the suspension system and the magnetic circuit system. The magnetic circuit system is fixed to the interior of the bowl-shaped frame. The suspension system comprises a diaphragm and at least one voice coil connected to a bottom portion of the diaphragm. The magnetic circuit system comprises at least one magnetic circuit assembly matching the voice coil. One end of the voice coil is connected to the diaphragm by means of a voice coil frame. The other end of the voice coil is suspended within an annular magnetic gap of the magnetic circuit assembly.

Abstract: The present invention provides a multi-engine array system and a loudspeaker. The multi-engine array system comprises at least two engine assemblies; the at least two engine assemblies are mounted, in an array, at the bottom of a basin stand of a loudspeaker, each of the engine assemblies comprises a voice coil configured with a voice coil skeleton and a magnetic circuit system which provides a magnetic field for the voice coil, the magnetic circuit system comprising a magnetic bowl, a magnet and a magnetic conductive plate, the magnetic bowl being mounted at the bottom of the basin stand, the magnet and the magnetic conductive plate being located within the magnetic bowl, a magnetic gap being formed between the magnetic bowl, the magnet and the magnetic conductive plate, the voice coil being suspended in the magnetic gap, and cross sections of the voice coil and the magnetic circuit system both being rectangular.

Abstract: The present invention relates to an injection method for a solid retarded acid. The injection method comprises the following steps: (1) uniformly mixing a solid acidic substance with a natural polymer according to a mass ratio of (0.2 to 1.

Abstract: The current invention provides for methods of promoting differentiation of human pluripotent stem cells into esophageal progenitor cells as well as the cells obtained from the methods, solutions, compositions, and pharmaceutical compositions comprising such cells. The current invention also provides for methods of using the esophageal progenitor cells for treatment and prevention of disease, and kits.

Abstract: This invention discloses a method for the reclaim of carbon dioxide and nitrogen from boiler flue gas, which includes: the flue gas enters into the water-washing and desulfurizing tower from the inferior part and contacts the sulfide solution flowing backward for the cleaning and desulfurizing of the flue gas; the desulfurized flue gas is introduced to the inferior part of the chemical absorber, where the contained carbon dioxide contacts the carbon dioxide adsorption liquid (containing, by the total weight of the liquid, of, besides water, 20-60% water solution of compound amine, 5-10% polyoxinolum, 1-5% antioxygen and 1-5% corrosion inhibitor) flowing backward; The adsorption liquid coming from the bottom of the absorber and having absorbed carbon dioxide, after heated when passing through heat exchangers, is sent to the top of the carbon dioxide regenerator and flows down through the packing layer; carbon dioxide is emitted out from the top of the regenerator; Nitrogen separated out from the top of the che