摘要:
A microwave range having a hood for removing contaminated air includes a chamber and first and second vent fan assemblies respectively positioned at opposite lateral sides of the chamber. The first and second vent fan assemblies draw contaminated air in through an air inlet located on a bottom surface of the microwave range below the chamber, and exhaust the air drawn in through the air inlet.
摘要:
The present invention is directed to an ultrasound system capable of providing a plurality of M-mode images corresponding to M-mode lines without moving a probe. A volume data forming and reconstructing unit of the present invention forms volume data based on the ultrasound echo signals, the volume data forming and reconstructing unit being configured to determine a beat period of the moving object and reconstruct the volume data based on the beat period. A processor forms at least one reference image based on the reconstructed volume data and one or more M-mode images corresponding to one or more M-mode lines set on the reference image and a display unit displays the reference image, the M-mode lines and the M-mode images.
摘要:
Disclosed is an electric oven including an outer case, a cavity formed in the outer case to receive food, an operating part formed on the outer case to operate the oven, a heater formed to transmit heat into the cavity, a magnetron for oscillating microwave to heat food loaded in the cavity, a door formed on a front of the outer case to selectively open the cavity, a choking portion disposed on an inner surface of the door to shield microwave; and a step formed on a portion, which contacts the choking portion, of the inner surface of the door.
摘要:
A heating apparatus for chemical vapor deposition equipment which is capable of providing a uniform temperature distribution, even for a wafer having a large surface area. The heating apparatus may include upper and lower reflection plates, with a heater located between the reflection plates. The apparatus may also include a barrier plate to help provide a uniform heat distribution and to minimize dust generation and metallic pollution on a wafer. The apparatus may also include a heater cover for covering the upper portions of the first reflection plate, the heater and the barrier plate, and the sides thereof. The upper reflection plate, which is installed above the heater cover, may be integrally formed with a gas spraying means.
摘要:
A method for manufacturing a pressure container having opposite dome ends with different opening diameters, comprising double-stepped windings involving a primary winding carried out at a small winding angle in a polar winding manner, for forming a primary form on a mandrel provided with bosses having different diameters and a secondary winding carried out at a large winding angle in a helical winding manner, for forming a secondary form on the primary form. The polar winding is carried out under the condition that a metal inserter having a diameter similar to that of the smaller boss is mounted to the larger boss, to be protruded axially outwardly of the larger boss. The helical winding is carried out under the condition that an inserter having a diameter similar to that of the larger boss is mounted to the smaller boss, to be protruded axially outwardly of the smaller boss
摘要:
The present invention relates to a more advanced preparation method of organic-transition metal hydride as a hydrogen storage material, precisely a more advanced preparation method of organic-transition metal hydride containing aryl or alkyl group that facilitates safe and reverse storage of massive amount of hydrogen. The present invention relates to a preparation method of an organic-transition metal hydride comprising the steps of preparing a complex reducing agent composition by reacting alkali metal, alkali earth metal or a mixture thereof and (C10-C20) aromatic compound in aprotic polar solvent and preparing organic-transition metal hydride by reacting the prepared complex reducing agent composition and organic transition metal halide. The method of the present invention has advantages of minimizing the numbers and the amounts of byproducts by using a complex reducing agent and producing organic-transition metal hydride safely without denaturation under more moderate reaction conditions.
摘要:
The provided are a method for preparing a spherical support for a catalyst for olefin polymerization and a solid catalyst prepared using the support, and a propylene polymer obtained by using the solid catalyst. Specifically, a method for preparing a spherical support which can be used for preparation of a propylene polymerization catalyst, particularly a dialkoxy magnesium support, comprising reacting metal magnesium and an alcohol in the presence of a halogenated nitrogen compound as a reaction initiator and adjusting the initial reaction temperature to the range of 20-25° C. and the aging temperature to the range of 55-65° C.; a solid catalyst for olefin polymerization prepared by using the above-obtained support; and a propylene polymer having a high bulk density prepared by using the above-obtained catalyst are provided.
摘要:
The present invention relates to an improved preparation method of an organic-transition metal hydride as a hydrogen storage material, especially an improved preparation method of an organic-transition metal hydride containing aryl or alkyl group that facilitates safe and reversible storage of a massive amount of hydrogen. The present invention also relates to a preparation method of an organic-transition metal hydride comprising the steps of: preparing a complex reducing agent composition by reacting alkali metal, alkali earth metal or a mixture thereof and a C10 to C20 aromatic compound in aprotic polar solvent; and preparing the organic-transition metal hydride by reacting the prepared complex reducing agent composition with an organic-transition metal halide in the absence of a hydrogen source. The method has the advantages of minimizing the number and amount of byproducts by using a complex reducing agent and producing an organic-transition metal hydride safely without denaturation under more moderate reaction conditions.
摘要:
The present disclosure provides an ultrasonic diagnostic apparatus. The ultrasonic diagnostic apparatus includes a fastening part having a band shape and wound around a diagnosis object, and a mover moving a probe along the fastening part.
摘要:
The present invention relates to substances which can be applied to the technical fields of gas storages, polymerization catalysts and optical isomers, their intermediates, and processes for preparing the same, which is characterized in that 1) possible disintegration of structure of the scaffold material (SM) is impeded, and 2) they are prepared by a simple manufacturing system as compared to the substances conventionally suggested in the application field. Specifically, it relates to scaffold material-transition metal hydride complexes comprised of scaffold material (SM) and transition metal hydride (M1H(n-1)) which is chemically bonded to the functional groups formed on the scaffold material, SM-transition metal halide complex and SM-transition metal ligand complex as the precursors, and a process for preparing the same. The SM-transition metal hydride complex according to the present invention is a substance for hydrogen storage which adsorbs hydrogen via Kubas adsorption. The complex according to the invention can store high capacity of hydrogen with safety and reversibility, while disintegration of its structure does not occur even with repeated adsorption-desorption of hydrogen.