Abstract: The present invention provides a method for selective recovery of a valuable metal from a waste denitrification catalyst through alkali fusion, the method comprising the steps of: (a) adding an alkali metal to a waste denitrification catalyst, followed by mixing and alkali fusion, to generate a calcination product; (b) subjecting the calcination product to water-leaching to recover an alkali leachate and a residue; (c) adding a precipitator to the alkali leachate, followed by stirring, to recover calcium metavanadate (Ca(VO3)2) or calcium tungstate (CaWO4) through precipitation; and (d) subjecting the recovered calcium tungstate to acid decomposition to prepare tungstic acid. Therefore, vanadium and tungsten can be recovered at high efficiency by a method in which a precipitator is added to a leachate, which is obtained by adding an excess amount of an alkali metal to a waste denitrification catalyst and carrying out calcination and water-leaching, and then a reaction rate is controlled.

Abstract: The present disclosure relates to an ensemble-based reservoir characterization method using multiple Kalman gains and dynamic data selection. The method includes preparing available data; generating initial ensembles by using the prepared static data; clustering and separating the generated initial models on the basis of a distance-based method; selecting the dynamic data; dynamically simulating the selected dynamic data by using the generated ensembles; calculating multiple Kalman gains by using initial models clustered in the same group as the selected dynamic data; updating ensemble members by means of the selected dynamic data and the multiple Kalman gains; and predicting a movement of a reservoir by using the updated models, and evaluating uncertainty thereof. Therefore, multiple Kalman gains are calculated and a final model is obtained using the selected dynamic data, and a reliable uncertainty evaluation and a future movement prediction can be performed within a short time by using the final model.

Abstract: The present invention relates to a method for leaching precious metals contained in a waste denitrification catalyst by using a pressure leaching process, and more specifically, to a method for leaching precious metals contained in a waste denitrification catalyst by using a pressure leaching process, the method comprising the steps of: forming a mixture by mixing a waste denitrification catalyst with a sodium salt solution; and leaching vanadium and tungsten contained in the mixture by feeding the mixture into a sealed pressurized reactor, and then heating and stirring the mixture.

Abstract: Provided is a method of first arrival picking of multi-channel seismic survey data considering sound source-receiver array that can increase the reliability of a first arrival selected from land seismic survey data or marine seismic survey data that includes background noise. Further, provided is a method of first arrival picking of multi-channel seismic survey data considering source-receiver array, which can improve the reliability of a first arrival or a micro earthquake occurrence location selected from measurement data of a micro earthquake seismic survey.

Abstract: A method of generating secondary data in geostatistics using observed data that: receiving prepared spatial correlation data, primary data, and observed data; generating initial models by performing a geostatistical technique using the spatial correlation data and the primary data; extracting a best representative model using the observed data from the initial models; and creating final models by converging candidate models. The initial models are created using geostatistics from the spatial correlation data and primary data, the representative models are determined using a distance-based clustering method, the best representative model is selected using the observed data, the candidate models near the best representative model are selected as final models depending on a convergence determination criterion, and uncertainty quantification and prediction of future performances may be conducted using the final models.

Abstract: A method for preparing graphene balls, the method including, a) preparing a dispersion which includes, a graphene oxide, a reducing agent ranging from a monosaccharide to a polysaccharide, ammonia water and a dispersion medium; and b) spraying and drying the dispersion. According to the preparation method of the present disclosure, it is possible to prepare uniformly sized and spherical graphene balls. Such graphene can be applied to various fields due to excellent physical and chemical characteristics.

Abstract: A method of recycling a by-product generated in a papermaking process including, pulverizing a by-product produced in a papermaking process to prepare a pulverized product, burning the pulverized product to prepare a burned product, hydrating the burned product to prepare a hydrate; and manufacturing paper from the hydrate and a paper slurry is provided, which allows reuse of by-products generated in conventional papermaking processes such as lime mud and lime kiln CaO, which is environmentally friendly as well as cost-effective, and also the level of whiteness of the by-products such as lime mud and lime kiln CaO generated in a papermaking process can be improved to that of a high-grade raw material, making it possible to also improve the whiteness of paper.

Abstract: A method for synthesizing high purity montmorillonite is disclosed. According to this synthesis method, bentonite is dissolved in aqua regia to produce a solution and then sodium hydroxide (NaOH) is added to the solution to produce a mixed solution. Then, the mixed solution is kept in a sealed state at a temperature of 90° C. inclusive to 100° C. exclusive to synthesize montmorillonite crystals.

Abstract: The present invention relates to a transmission for a vehicle, and more particularly, to a compound transmission of combining a differential gear and a continuously variable transmission, which transmits power through the differential gear and a transmission gear at a low speed and transmits the power through the continuously variable transmission and the differential gear at a high speed. According to the present invention, the shifting is performed through the differential gear unit at a low stage requiring large torque and low rpm and performs the shifting through the continuously variable transmission at a high stage requiring relatively small torque and high rpm to provide optimum shifting efficiency by collecting only advantageous of the respective units.

Abstract: The present invention relates to an apparatus for editing geological elements using a touch-based interface for retrieving geological information of a survey area, thereby mapping and displaying geometric elements of points, lines, and areas. The apparatus for editing geological elements according to the present invention includes a geological symbol storage module configured to store point symbols, line symbols, and area symbols; a geographic information storage module; a geological element edit module configured, by a user's operation, to read geological information on a specific map from the geological information storage module, to read the symbols from the geological symbol storage module, to rotate the point symbols, to connect the line symbols to each other, to automatically transform the line symbols to area symbols, and to automatically create outlines for the area symbols; a controller; and a display module.

Abstract: The present invention provides a method of carbonating carbon dioxide with high purity using a paper mill waste sludge by preparing a paper mill waste sludge which is a waste product discharged during the production of papermaking, adding acid to the paper mill waste sludge and reacting the acid therewith to produce a mixed solution and stirring, separating a supernatant of the mixed solution into an eluate, adding a basic substance to the eluate and adjusting pH to precipitate some of the ions in the eluate, and then adding a reaction initiator to the eluate in which some ions are precipitated and removed, and injecting carbon dioxide for a carbonation reaction.

Abstract: Colloidal nanocrystal electronic devices including multiple types of nanocrystal device elements including nanocrystal metallic electrodes, nanocrystal insulators, and nanocrystal insulators. Colloidal nanocrystal electronic devices may be produced by forming multiple nanocrystal electronic device elements on a substrate.

Abstract: The invention relates to a lithium adsorption-desorption apparatus including a plurality of reaction tanks arranged in a row; a guide rail disposed at an upper portion of the reaction tank; a movable driving unit coupled to a moving means that moves along the guide rail; and a reaction housing which is mounted to the driving unit, and can be vertically moved or rotated in a state in which the lithium adsorbent is fixed thereto, and after immersing in the reaction tank, accelerates adsorption or desorption of lithium, and after being lifted, discharges residual solution from the lithium adsorbent by rotation movement. Therefore, the lithium adsorption desorption apparatus can fix a large amount of lithium adsorbent and immerse it in a lithium-containing solution to effectively adsorb lithium and then quickly desorb lithium in a desorption solution, and can efficiently wash the lithium adsorbent in a cleaning solution.

Abstract: A method of analyzing fines migration in a multiphase flow in a sediment layer using X-ray computed tomography (CT) image includes, preparing an X-ray CT image analysis sample; analyzing an X-ray CT image during a depressurization process; calibrating and calculating a fines content; and estimating a fines migration analysis result.

Abstract: A method of analyzing fines migration in a multiphase flow in a sediment layer using X-ray computed tomography (CT) image includes, preparing an X-ray CT image analysis sample; analyzing an X-ray CT image during a depressurization process; calibrating and calculating a fines content; and estimating a fines migration analysis result.

Abstract: Provided is method of signal processing of raw data obtained using a chirp sub-bottom profiler. The method includes transmitting a chirplet (minimum frequency: initial first frequency, maximum frequency: initial second frequency, pulse length: initial pulse length) to survey target strata using a chirp sub-bottom profiler and acquiring raw data reflected and received from a target object, correcting the raw data, generating a comparison chirplet using a sub-bottom reflection signal of the raw data, cross-correlating the corrected raw data with the comparison chirplet to generate a first Klauder wavelet section, auto-correlating the comparison chirplet to generate a second Klauder wavelet, and deriving a physical property of the survey target strata by deconvoluting the first Klauder wavelet section and the second Klauder wavelet.

Abstract: An embodiment of the present invention provides a method for preparing a silicon-carbon-graphene composite, comprising the steps of: (step 1) adding a carbon precursor solution to silicon and performing wet grinding so as to prepare a suspension: (step 2) forming a silicon-carbon composite by spray drying the suspension; and (step 3) spray drying and heat treating a solution comprising the silicon-carbon composite and graphene oxide.

Abstract: The present disclosure relates to an onshore lithium-recovering device for a lithium ion adsorption and desorption process including a supply unit for supplying lithium-containing water in which lithium is dissolved, a composite unit, a washing unit, a desorbing liquid unit, an extract liquid unit, a pressure adjusting unit, a discharge unit, and a control unit. Therefore, the lithium adsorption means is moved onshore so it is possible to significantly reduce the plant installation cost and the operating cost as compared to the lithium recovery process that operates the conventional offshore plant.

Abstract: The present invention relates generally to an apparatus and method for calculating efficient 3-dimensional (3D) traveltime by using coarse-grid mesh for a shallow depth source. More particularly, the present invention relates to an efficient 3D traveltime calculation method for a shallow depth source by combining a suppressed wave equation estimation of traveltime (SWEET) algorithm and an equivalent source distribution (ESD) algorithm, wherein the SWEET algorithm is a traveltime calculation algorithm using an damped wave equation and the ESD algorithm is for equivalently distributed sources; and to an apparatus and method for calculating efficient 3D traveltime by using coarse-grid mesh for a shallow depth source which may need less calculation time compared with that of a conventional SWEET algorithm.

Abstract: The present invention relates to a method for recovering vanadium and tungsten from a leach solution of a waste denitrification catalyst, and more specifically, to a method for recovering vanadium and tungsten from a leach solution of a waste denitrification catalyst comprising the steps of: recovering vanadium by adding acid and then adding a calcium compound to a leach solution of a waste denitrification catalyst to precipitate the vanadium; and recovering tungsten by adding acid and then adding a calcium compound to the remaining leach solution after recovering the vanadium to precipitate the tungsten.