Abstract:
The present invention relates to a transition metal complex useful as a transition metal catalyst in the preparation of an ethylene homopolymer or a copolymer of ethylene and an α-olefin, a catalyst composition comprising the same and a process of preparing an ethylene homopolymer or a copolymer of ethylene and an α-olefin using the same. More particularly, it relates to a transition metal complex having a cyclopentadiene derivative and at least one phenyl oxide ligand substituted at the 2-position of phenyl with, for example, a silyl group having a C1-C30 hydrocarbon group or a C1-C20 hydrocarbon group, around a group IV transition metal, with no crosslinkage between the ligands, a catalyst composition comprising the transition metal complex and a cocatalyst selected from the group consisting of an aluminoxane and a boron compound, and a process for preparing an ethylene homopolymer or a copolymer of ethylene and an α-olefin using the same.
Abstract:
This invention relates to a method of preparing a multicomponent bismuth molybdate catalyst by changing the pH of a coprecipitation solution upon coprecipitation and a method of preparing 1,3-butadiene using the catalyst. The multicomponent bismuth molybdate catalyst, coprecipitated using a solution having an adjusted pH, the preparation method thereof, and the method of preparing 1,3-butadiene through oxidative dehydrogenation using a C4 mixture including n-butene and n-butane as a reactant are provided. The C4 raffinate, containing many impurities, is directly used as a reactant without an additional process for separating n-butane or extracting n-butene, thus obtaining 1,3-butadiene at high yield. The activity of the multicomponent bismuth molybdate catalyst can be simply increased through precise pH adjustment upon coprecipitation, which is not disclosed in the conventional techniques. This method can be applied to the increase in the activity of multicomponent bismuth molybdate catalysts reported in the art.
Abstract:
A process for the production of lower alkyl alkoxyacetates, preferably methyl methoxyacetate, by reaction of a di-(lower alkoxy)methane, preferably dimethoxymethane, with the acid form of a medium-pore or large-pore zeolite catalyst, preferably the acid form of faujasite, ZSM-5, mordenite, or beta, in the gas phase at atmospheric or near-atmospheric pressures.
Abstract:
A curling mascara apparatus is disclosed. The curling mascara apparatus has a barrel for holding mascara liquid therein, a cover coupled to a mouth of the barrel, a makeup unit provided on an end of a support cylinder which extends inside the cover along a central axis thereof, and a button manipulating part for manipulating the makeup unit. The makeup unit includes a slide bar which is slidably inserted into the support cylinder and operated in conjunction with the button manipulating part, a lower tong which is integrally provided at an end of the slide bar, an upper tong which is hinged at an end thereof to the lower tong so as to perform a clamping operation, and an elastic member which provides elastic force such that the lower and upper tongs are rotated around a hinge axis to be opened.
Abstract:
A mascara brush is disclosed. The mascara brush of the present invention includes a bristle part (120) for applying mascara to eyelashes, and a comb part (130) for tidying the eyelashes. The bristle part and the comb part are integrally formed with a brush body through an injection molding process, such that the bristles of the bristle part are thin and the comb teeth of the comb part are relatively thick. As such, in the present invention, because the bristle part, for applying mascara to the eyelashes, and a comb part, for tidying the eyelashes, are integrally formed with the brush body by injection molding, manufacturing equipment and manufacturing and assembling processes can be simplified, thus reducing production costs and enhancing workability and productivity.
Abstract:
Provided is a navigation system using a RFID system and a method for displaying a construction area road. The navigation system includes a RFID tag for storing construction information, and upon receipt of a predetermined command, transmitting the construction information; and a RFID reader for transmitting an information read command to the RFID tag, and receiving the construction information in response to the information read command. A bypass path is re-searched depending on the received construction information, and path guidance is performed.
Abstract:
A method of operating a video decoder system includes decoding an encoded video frame using a decoder control unit for determining whether the acceleration is required for respective decoding functional units and the degree thereof. This includes the decoder control unit receiving a target time value to be taken to decode a frame; the decoder control unit performing main processing including inverse transformation and motion prediction on a predetermined frame; the deblock unit providing a value of time taken to perform deblock filtering on a frame prior to the predetermined frame to the decoder control unit; the decoder control unit comparing a value of total time taken with the target time value, in which the received value of time taken for the deblock filtering of the previous frame and the value of time taken for the main processing are added; and the decoder control unit accelerating deblock filtering of the deblock unit if it is determined that the total time taken exceeds the target time value at the comparison step.
Abstract:
An organic light emitting display capable of minimizing the voltage drop of pixel power sources supplied to an organic light emitting display panel, contemplates an organic light emitting display panel including a pixel unit on which an image is displayed, and a plurality of first and second power source pads provided at two or more edges outside the pixel unit in order to receive first and second pixel power sources in at least two different directions, a plurality of tape carrier packages (TCP) electrically coupled to the organic light emitting display panel and including driving ICs for driving the organic light emitting display panel and power source lines for transmitting the first and second pixel power sources to the first and second power source pads, and driving boards electrically coupled to the TCPs in order to supply control signals for controlling the driving ICs and the first and second pixel power sources to the TCPs.
Abstract:
An inkjet print head and manufacturing method includes a substrate, an insulating layer formed on a surface of the substrate to have an electrode formation space, an electrode formed in the electrode formation space to be positioned on the same plane with the insulating layer, a heater formed on upper surfaces of the insulating layer and the electrode, and a passivation layer formed on the insulating layer and the heater. The heater is formed to be flat on the insulating layer and the electrodes, thereby reducing the thickness of the passivation layer. Further, copper having relatively high electric conductivity is used as a material of the electrodes, which apply current to the heater to generate heat, instead of aluminum, thereby increasing a degree of freedom in the thickness of the electrodes. Further, uniform current can be applied to the respective heaters at different positions in single firing and full firing of ink, thereby reducing entire input energy and also improving ink ejection stability and reliability of the inkjet print head.
Abstract:
Disclosed herein is a method of regenerating a titanium-containing molecular sieve catalyst. Particularly, this invention provides a method of regenerating a titanium-containing molecular sieve catalyst used in epoxidation of olefin through simple treatment using a mixture solvent comprising aqueous hydrogen peroxide and alcohol. According to the method of this invention, when the catalyst having decreased activity is regenerated, the activity of the regenerated catalyst is equal to that of new catalyst and can be maintained stable for a long period of time.