Abstract:
The invention provides highly transparent single crystalline AlN layers as device substrates for light emitting diodes in order to improve the output and operational degradation of light emitting devices. The highly transparent single crystalline AlN layers have a refractive index in the a-axis direction in the range of 2.250 to 2.400 and an absorption coefficient less than or equal to 15 cm-1 at a wavelength of 265 nm. The invention also provides a method for growing highly transparent single crystalline AlN layers, the method including the steps of maintaining the amount of Al contained in wall deposits formed in a flow channel of a reactor at a level lower than or equal to 30 % of the total amount of aluminum fed into the reactor, and maintaining the wall temperature in the flow channel at less than or equal to 1200°C.
Abstract:
A sealing device for an elevator door includes a doorway member (10), doors (6a, 6b), a movable member (32), a push-down mechanism (36, 37) and a sealing mechanism (30). The doorway member (10) is provided for a gate. The doors (6a, 6b) open or close along the doorway member (10). The movable member (32) is set horizontally and provided to be movable in a vertical direction in the doorway member (10), and it is urged upwards by an urging unit (35). The push-down mechanism (36, 37) pushes down the movable member (32) against the force of the urging unit (35) just before the doors (6a, 6b) are closed. The sealing mechanism (30) is kept non-contact with the doors (6a, 6b) while they are moving, and seals the gap between the doors (6a, 6b) and the doorway member (10) as it is brought into contact with upper section of the doors (6a, 6b) when the movable member (32) is pushed down by the push-down mechanism (36, 37).
Abstract:
An acrylate copolymer consisting of repeating units derived from a (meth)acrylic ester compound and repeating units derived from a vinyl compound having an -SO3R group (wherein R represents hydrogen or lower alkyl) or an acceptable salt group thereof, wherein at least part of the ester groups of said (meth)acrylic ester compound are substituted by a group having repeating units derived from a (meth)acrylic ester. The invention also relates to a method of producing the copolymer and its use wherein the adhesiveness of the copolymer is utilized.