摘要:
A porous polyimide obtained by removing a silica phase from an organic-inorganic polymer hybrid having a molecule structure in which a polyimide phase and the silica phase are held together by covalent bond.
摘要:
It is an object of the present invention to provide a polyimide-based hybrid material which is industrially and advantageously utilized because of having better gas permeability, electric characteristics, heat resistance, mechanical strength, and the like as compared with the conventional polyimide-based hybrid materials, while keeping chemical resistance, forming characteristics (process characteristics), and the like inherently possessed by polyimide. Provided is a hyperbranched polyimide-based hybrid material constituted of an organic-inorganic polymer hybrid, wherein the organic-inorganic polymer hybrid has a hyperbranched polyimide moiety and an inorganic oxide moiety which are combining each other via covalent bond and constituting a composite structure.
摘要:
An imaging optical system includes: an object-side lens group having, in order from its object side, an object-side positive meniscus lens that is convex on its object side and has positive refracting power, and an object side negative meniscus lens that is convex on its object side and has negative refracting power; and image-side lens group having, in order from its object side, an image-side negative lens, an image-side first positive lens and an image-side second positive lens. The image-side negative lens and the image-side first positive lens adjacent thereto form together a cemented doublet.
摘要:
A porous polyimide obtained by removing a silica phase from an organic-inorganic polymer hybrid having a molecule structure in which a polyimide phase and the silica phase are held together by covalent bond.
摘要:
The object-side lens group G1 comprises two lenses: in order from its object side, an object-side positive meniscus lens L11 that is convex on its object side and has positive refracting power and an object-side negative meniscus lens L12 that is convex on its object side and has negative refracting power, and the image-side lens group G2 comprises three lenses: in order from its object side, an image-side negative lens L21, an image-side first positive lens L22 and an image-side second positive lens L23. The image-side negative lens L21 and the image-side first positive lens L23 adjacent thereto form together a cemented doublet, and the following conditions (1), (2) and (3) are satisfies. 2.3≦|f1/f|≦5.3 (1) 0.8≦f2/f≦1.0 (2) 0.55≦L/f≦0.85 (3) where f is the focal length of the whole imaging optical system, f1 is the focal length of the object-side lens group in the imaging optical system, f2 is the focal length of the image-side lens group in the imaging optical system, and L is the axial distance from the vertex of the lens surface located in, and nearest to the object side of, the object-side lens group to the vertex of the lens surface located in, and nearest to the object side of, the image-side lens group.
摘要:
In a surge protection device 40 (40-1 or 40-2) used for a surge protection apparatus, a gas arrester 41 is connected in series with a varister group consisting of a plurality of varisters 42-1 to 42-5 which have high withstand capacity and are connected in parallel to one another and a discharge resistor 43 is connected between both electrodes of the varister group. Besides, since the varister voltages are set higher than the peak value of the AC power supply voltage, the varisters 42-1 to 42-5 are normally insulated from a power supply circuit by the gas arrester 41. Even if an abnormal voltage is applied, since an operating voltage of the varisters 42-1 to 42-5 is set higher than a peak value of the AC power supply voltage, AC power supply current will not flow. Charges stored in the varisters 42-1 to 42-5 are released quickly through the resistor 43, making it possible to prevent the gas arrester 41 from restriking. This provides a small, reliable, inexpensive surge protection device (SPD) relatively simple in structure and a surge protection apparatus using thereof.
摘要:
A bracket/collar is disclosed to circumscribe an integrated circuit card into an electrical or an optical connector. The bracket/collar has several features, such as grooves, to hold the circuit card into the bracket; the grooves may be on any available edge not mating with or held by the connector, and may hold a corner or other feature of the circuit card. Another feature of the bracket/collar is a mechanism, such as a hook or notch, to connect with the connector. Yet another feature of the bracket/collar is that, by its shape, it provides sufficient loading of the circuit card into the connector so that when dropped or otherwise mechanically shocked, the circuit card is not displaced from its connector. The bracket/collar is especially useful to secure DIMM memory cards within their electrical connectors in handheld computers.
摘要:
A cooling device has a heat sink for transferring a portion of heat generated by a heat generating component to a position different from the position of the heat generating component by heat conduction, a heat pipe for forcibly transferring at least a portion of the rest of the heat generated by the heat generating component to a position different from the position of the heat generating composition, and a forced-heat-radiating means for forcibly radiating the transferred heat from the heat radiating means.
摘要:
There is disclosed an energy regenerating mechanism of an automobile, particularly to that adapted for an electric car. The energy regenerating mechanism is characterized in that a plurality of generators are provided so that the kinetic energy generated when the engine idles and the automobile continues running is converted into electric energy.
摘要:
A method of preparing a resin composition for hard coat, comprises: a first step of obtaining a polyfunctional (meth)acrylate monomer modifying agent by addition reaction between a modifying agent having a thiol group and a three- or more functional (meth)acrylate monomer to form a covalent bond between the thiol group and acryloyl group and/or methacryloyl group, and a second step of modifying metal oxide microparticles with the polyfunctional (meth)acrylate monomer modifying agent that is obtained from the first step.