Abstract: The present invention relates to a composition for selectively etching silicon on a surface on which a silicon oxide film (SiO2) and silicon (Si) are exposed. According to the present invention, it is possible to improve etch selectivity of silicon on the semiconductor surface.

Abstract: Provided is a method for preparing an oligomer including: supplying a monomer stream and a solvent stream to a reactor to perform an oligomerization reaction to prepare a reaction product; supplying a discharge stream from the reactor including the reaction product to a separation device and supplying a lower discharge stream from the separation device to a settling tank; adding an organic flocculant to the settling tank to settle and remove a polymer and supplying the lower discharge stream from the separation device from which the polymer is removed to a high boiling point separation column; and removing a high boiling point material from the lower portion in the high boiling point separation column and supplying an upper discharge stream including an oligomer to a solvent separation column.

Abstract: A vehicle moving apparatus may include a housing extending in a first direction; an elevator coupled to the housing to be movable in the first direction and another direction opposite thereto, extending in a third direction and being inserted to be drawable into an underside space of a vehicle, and configured to lift or lower a wheel of the vehicle; and a wheel assembly coupled to the elevator and configured to move the housing and the elevator in a direction toward the vehicle or in a direction opposite the vehicle, wherein the wheel assembly includes a wheel rotatably provided with a vertical direction as an axis, and configured to movably support the elevator; and an actuator coupled to the wheel and configured to provide power for rotating the wheel, wherein the wheel is rotatable such that a diameter of the wheel is aligned between the first and third directions.

Abstract: A picture generation apparatus and a control method thereof are disclosed. An embodiment of the present disclosure provides a picture generation apparatus including a light source; a Spatial Light Modulator (SLM) configured to output an image using light transmitted from the light source; and a control unit configured to control the light source and the SLM based on at least one of illuminance of the surroundings or content of the image.

Abstract: Provided is a method of producing an oligomer, the method including: supplying a monomer stream and a solvent stream to a reactor to perform an oligomerization reaction to produce a reaction product; supplying a discharge stream of the reactor to a separation device, and supplying an upper discharge stream of the separation device including an unreacted monomer to the reactor and supplying a lower discharge stream of the separation device to a settling tank; settling a polymer in the settling tank and removing the polymer, and supplying the lower discharge stream of the separation device from which the polymer is removed to a high-boiling point separation column; removing a high-boiling point material from a lower discharge stream of the high-boiling point separation column and supplying an upper discharge stream of the high-boiling point separation column including an oligomer to a solvent separation column; and separating a solvent and the oligomer in the solvent separation column.

Abstract: Disclosed relates to a process for preparing N(5)-ethylglutamines economically without a specific purification process via a simplified and safe process, in which glutamic acid derivatives, represented by formula 1, protected by phthaloyl groups react with ethylamine to cause an amidation and a deprotection reaction in turn under the same reaction condition, thus preparing N(5)-ethylglutamines.

Abstract: The present invention relates to a method for the preparation of 3-substituted-3?-hydroxypropionitrile, more particularly, to a method for the preparation of 3-substituted-3?-hydroxypropionitrile which comprises performing ring opening of 1-substituted-ethylene oxide using sodium cyanide and citric acid in a range of pH 7.8˜8.3 to provide 3-substituted-3?-hydroxypropionitrile in high optical purity and with high yield.

Abstract: Ferrocenyldiphosphin-ruthenium complexes are new and good catalysts for the hydrogenation of exocyclic double bond of d-Thiophene 3 to d-Thiophane 4, both of which are intermediates of D-Biotin 1 synthesis. in which R signifies —OCH3(3a), —OCH2CH3(3b), —CH2COOH(3c), CH2COOCH3(3d) or —CH2COOEt(3e) and Bz signifies benzyl group.

Abstract: Ferrocenyldiphosphin-ruthenium complexes are new and good catalysts for the hydrogenation of exocycilc double bond of d-Thiophene 3 to d-Thiophane 4, both of which are intermediates of D-Biotin 1 synthesis.