Abstract: A semiconductor device with a novel structure is provided. The semiconductor device includes a cell array performing a product-sum operation of a first layer and a product-sum operation of a second layer in an artificial neural network, a first circuit from which first data is input to the cell array, and a second circuit to which second data is output from the cell array. The cell array includes a plurality of cells. The cell array includes a first region and a second region. In a first period, the first region is supplied with the t-th (t is a natural number greater than or equal to 2) first data from the first circuit and outputs the t-th second data according to the product-sum operation of the first layer to the second circuit. In the first period, the second region is supplied with the (t+1)-th first data from the first circuit and outputs the (t+1)-th second data according to the product-sum operation of the second layer to the first circuit.

Abstract: An electronic device having an eye tracking function is provided. The electronic device includes a display device and an optical system. The display device includes a first light-emitting element, a second light-emitting element, a sensor portion, and a driver circuit portion. The sensor portion includes a light-receiving element. The first light-emitting element has a function of emitting infrared light or visible light. The second light-emitting element has a function of emitting light of a color different from that of light emitted from the first light-emitting element. When the first light-emitting element emits infrared light, the light-receiving element has a function of detecting the infrared light that is emitted from the first light-emitting element and reflected by an eyeball of a user.

Abstract: To provide a novel electronic device. The electronic device includes a housing and a display device. The display device includes a first layer, a second layer, and a third layer. The first layer, the second layer, and the third layer are provided in different layers. The first layer includes a driver circuit and an arithmetic circuit. The second layer includes pixel circuits and a cell array. The third layer includes light-receiving devices and light-emitting devices. The pixel circuits each have a function of controlling light emission of the light-emitting device. The driver circuit has a function of controlling the pixel circuits. The arithmetic circuit has a function of performing arithmetic processing on the basis of first data corresponding to currents output from the light-receiving devices and second data corresponding to a potential held in the cell array.

Abstract: A method of producing an optically active N-methylamino acid of the general formula (2): 1

Abstract: A process for preparing optically active (R)-3-chloro-1,2-propanediol, which comprises subjecting (R,S)-3-chloro-1,2-propanediol to the reaction of a microorganism belonging to genus Serratia in a reaction mixture, and then collecting the residual (R)-3-chloro-1,2-propanediol. According to the process of the present invention, (R)-3-chloro-1,2-propanediol can be efficiently prepared starting from low cost (R,S)-3-chloro-1,2-propanediol.

Abstract: There is disclosed a process for scrubbing hollow fiber membranes in at least one hollow fiber membrane module disposed in a hollow fiber membrane filter column wherein the hollow fiber membrane module includes a large number of hollow fibers bundled together therein as the hollow fiber membranes. In the process, the filtration step of passing raw water through the pores of the hollow fibers from the outsides thereof to the insides thereof to thereby trap the fine particles on the outer surfaces of the hollow fibers is followed by the scrubbing step of charging bubbles into water around the outer surfaces of the hollow fibers to agitate the water to vibrate the hollow fibers, thereby exfoliating the fine particles trapped on the outer surfaces of the hollow fibers.

Abstract: There is disclosed a filtration process using at least one hollow fiber membrane module including a large number of porous hollow fibers bundled therein. In the process, the filtration step of passing raw water containing fine particles through the pores of the hollow fibers from the outsides thereof to the insides thereof to thereby trap the fine particles on the outer surfaces of the hollow fibers is followed by the cooling step of lowering the temperature of water inside the hollow fiber membrane module to cool the hollow fibers before the scrubbing step of charging bubbles into water around the outer surfaces of the hollow fibers to vibrate the hollow fibers to thereby exfoliate the fine particles trapped on the outer surfaces of the hollow fibers. The scrubbing step is followed by the drain step of draining the resulting waste water out of the system.