Abstract: The present invention provides a method for producing an internal olefin for obtaining an internal olefin sulfonate having high low-temperature stability, a method for producing an internal olefin sulfonate using the internal olefin, and a low-temperature stabilization method. The method for producing an internal olefin of the present invention includes the step of internally isomerizing an ?-olefin having 8 or more and 24 or less carbon atoms using a fixed bed reactor in which solid acid catalyst particles are packed in a reaction tube. A ratio (D/dp) of an inner diameter D of the reaction tube to an average particle diameter dp of the solid acid catalyst particles is 25 or more.

Abstract: An outdoor unit of an air conditioner includes: a cabinet in which at least one air inlet and at least one air outlet are formed; a heat exchanger arranged inside the cabinet; an air inlet hood that covers the air inlet; and an air outlet hood that covers the air outlet. The air inlet hood includes: a facing panel arranged facing the air inlet; an upper surface panel arranged on an upper surface of a part between the air inlet and the facing panel; and two side panels arranged respectively on two side surfaces of the part between the air inlet and the facing panel. A lower surface air intake hole is provided to a lower surface of the part between the air inlet and the facing panel. A side surface air intake hole is provided to at least one of the two side panels.

Abstract: A polyimide excelling in heat resistance, chemical resistance, water repellency, dielectric characteristics, electrical characteristics, and optical characteristics and a polyamide acid useful as the raw material therefor are provided. Specifically, a polyamide acid containing a chlorine atom and a fluorine atom and comprising a repeating unit represented by the following formula (1): (wherein X and X? independently denote a divalent organic group; Y and Y? independently denote a chlorine, bromine, or iodine atom; p and p? denote independently denote the number of fluorine atom {F in the formula (1)} bonded to the relevant benzene ring, representing an integer of 0-3; q and q? independently denote an integer of 0-3; and p+q total 3, and p?+q? total 3).

Abstract: A polyimide excelling in heat resistance, chemical resistance, water repellency, dielectric characteristics, electrical characteristics, and optical characteristics and a polyamide acid useful as the raw material therefor are provided.

Abstract: A heat pump type air conditioner comprising: an exterior unit including an exterior heat exchanger, a plurality of compressors, a four-way valve, an exterior expansion device, and an injection circuit for injecting the liquid refrigerant into each of the plurality of compressors; and a plurality of interior units, each of which includes an interior heat exchanger, connected to the exterior unit. The exterior unit further comprises device for controlling flow rate of the liquid refrigerant to be injected in accordance with number of the plurality of interior units.

Abstract: A dielectric multilayer filter applicable to optical communication systems is disclosed, as is a fabrication method therefor, and an optical element incorporating the same. The disclosed dielectric multilayer filter includes a fluorinated polyimide base layer with a dielectric multilayer formed thereover. According to the disclosed fabrication method, a fluorinated polyimide layer is formed by applying liquid fluorinated polyimide material over a smooth surface to a predetermined thickness followed by drying and hardening, after which a dielectric multilayer is formed over the fluorinated polyimide layer by an ion assist vapor deposition method, and then stripping the fluorinated polyimide layer away from the underlying smooth surface. The disclosed dielectric multilayer filter can be easily and economically produced at a suitably small thickness with no need for grinding, exhibits highly uniform physical and optical properties, and is exceedingly durable and resistant to curling and warping.

Abstract: A system and apparatus for controlling the operation of a vibrating compressor using a predetermined frequency corresponding to the load thereof, comprising a first sensor for detecting a temperature of pressure corresponding to the saturated vapor pressure of a refrigerant sucked by a vibrating compressor, a second sensor for detecting a temperature or pressure corresponding to the saturated vapor pressure of the refrigerant compressed and discharged by the compressor, and a control section for generating a drive power of a predetermined frequency based on the temperatures and pressures detected by the first and second sensors, and characterized in that the compressor is driven by a drive power generated by the control section.