Abstract: This application provides a pressure sensitive button and an electronic device. The pressure sensitive button includes a first circuit board, a second circuit board, a first capacitor, a second capacitor, and a first connector, where a first surface of the first circuit board is disposed opposite to a second surface of the second circuit board, the first capacitor is disposed on the first surface, the second capacitor is disposed on the second surface, the first capacitor is disposed opposite to the second capacitor, a first end of the first connector is connected to the first surface, a second end of the first connector is connected to the second surface, and the first connector is configured to limit the first surface to be parallel to the second surface.

Abstract: Water-in-oil emulsions are provided that include an alkyl propylene diamine and an ethoxylated alcohol as the inverting surfactant, which is present in an amount less than 5 percent by weight of the water-in-oil emulsion.

Abstract: A polymer dispersion may include a water soluble copolymer, a water soluble salt, a polyol, and water. A method of preparing a polymer dispersion may include controlled radical polymerization. A method of using the polymer dispersion as a friction reducer in oil field processes.

Abstract: Provided are methods for modifying the permeability of subterranean formations for the purposes of selectively reducing excessive production of water and aqueous fluids in oil and gas wells, wherein the methods utilize an emulsion containing a copolymer, which is typically prepared in an aqueous salt media.

Abstract: Disclosed is a polymer dispersion prepared by controlled radical polymerization and a use of the polymer dispersion as a friction reducer in oil field processes.