Abstract: Provided is an apparatus for a soil box experiment making a shape of a variable landslide surface. The apparatus for the soil box experiment making the shape of the variable landslide surface includes a soil box for realizing a slope on which landslide occurs, the soil box being inclinedly disposed and having an opened upper portion to accommodate soil therein, a base member disposed under the soil box to support the soil box, and a shape changing unit for changing a shape of a bottom surface of the soil box.

Abstract: Provided is an apparatus for a soil box experiment applying vertical vibration. The apparatus for the soil box experiment applying the vertical vibration includes: a soil box for realizing a slope on which landslide occurs, the soil box being inclinedly disposed and having an opened upper portion to accommodate soil therein, a base member disposed under the soil box to support the soil box, and a vibration unit disposed on the base member to vertically vibrate the soil box.

Abstract: Provided is a banking structure using a rock producing acid drainage. The banking structure includes a banking layer including the rock having acid drainage production possibility and an inhibitor for reducing acid drainage production potential of the rock, a capillary breaker layer stacked between a lower portion of the banking layer and an underground water level surface to prevent underground water from being introduced into the banking layer by a capillary phenomenon, and a finishing layer stacked on an upper portion of the banking layer according to a use thereof.

Abstract: The present invention relates to a method for preparing lithium manganese oxide used as a lithium adsorbent and, more particularly, to a method for preparing lithium manganese oxide by a solid-phase reaction. According to the preparation method of the present invention, since the entire reaction is carried out only by the solid-phase reaction, it is possible to solve the problem of waste fluids produced during a conventional liquid-phase reaction, and the preparation method of the present invention is a single process, which is suitable for mass production.

Abstract: An apparatus for measuring permittivity of a sample. The apparatus includes: a sample chamber including a sealed space portion in which a sample to be measured is put; a pressure adjusting unit for varying pressure by applying water pressure to the space portion of the sample chamber; a permittivity sensor for measuring permittivity of the sample and disposed outside the sample chamber; measurement conducting wires including conductors, installed to contact the sample and connected to the permittivity sensor by using electric wires; and a data logger for storing data relating to permittivity that is measured by the permittivity sensor.

Abstract: The present disclosure provides a method of preparing highly pure lithium carbonate from brine. The method includes adding an adsorbent to the brine, from which the magnesium ions Mg2+ have been removed, to adsorb lithium ions Li+ to the adsorbent, followed by providing the adsorbent having the lithium ions Li+ adsorbed thereto to a strong acid solution to desorb the lithium ions Li+ from the adsorbent; enriching the strong acid solution in which the lithium ions Li+ are desorbed from the adsorbent; and obtaining lithium carbonate Li2CO3 through chemical reaction between the lithium ions Li+ in the enriched solution and a carbonate precursor.

Abstract: Disclosed herein is a flexible short pipe having a shock absorbing function. The flexible short pipe has flexibility so as to absorb shocks generated in the longitudinal direction of a lifting pipe (or flexible pipe) and have resistance to a bending load or a torsional load when being wound around a roller. The flexible short pipe includes flanges provided at upper and lower ends thereof to be coupled to a unit lifting pipe or flexible pipe. An inner layer has a curved shape and is provided between the upper and lower flanges to allow slurry, lifted up or discharged by a lifting pump, to flow along the inner layer. An outer layer has a curved shape and surrounds the inner layer. A shock absorbing means is positioned between the inner layer and the outer layer, and absorbs longitudinal force and bending force.

Abstract: An apparatus for dissolution experiment of mineral is disclosed. The apparatus for a dissolution experiment of mineral according to the inventive concept includes a main body including frames, a mounting unit including a container whose mouth is open so as to contain an alkaline solution, a first mineral sample and a second mineral sample contacting with each other in the alkaline solution, a cylinder including a plunger that is attached to the main body and movable so as to be inserted in and separated from the container for pressing the first mineral sample toward the second mineral sample included in the container, and a load cell supporting the mounting unit from the below and measuring a pressure applied to the second mineral sample.

Abstract: A ring shear apparatus for measuring a shear strength of soil samples. The ring shear apparatus considering a wall-slip effect including: an upper ring for forming a first accommodation portion having a ring shape in which soil samples are accommodated; a lower ring for forming a second accommodation portion that corresponds to the first accommodation portion of the upper ring and has a ring shape in which soil samples are accommodated, closely attached to a lower portion of the upper ring and rotatably installed relative to the upper ring; a rotating unit for rotating the lower ring relative to the upper ring; and a shear strength measuring sensor combined with the upper ring and for measuring a shear strength of the soil samples, wherein a plurality of protrusions that protrudes from the lower ring is formed on an inner circumferential surface of the lower ring along a circumferential direction of the lower ring in order to prevent the soil samples from being slid when the lower ring is rotated.

Abstract: The present invention relates to a method of concentrating and recovering precious metals from waste mobile phone PCBs and spent automotive catalysts using waste nonferrous slag, in which precious metals such as gold, silver, platinum, palladium or rhodium can be concentrated and recovered by simultaneously treating different industrial wastes, including waste nonferrous slag, waste mobile phone PCBs and spent automotive catalysts, and industrial waste can be recycled as resources. According to the present invention, it is possible to maximize the utilization ratio of precious metal resources that totally depend on the import in terms of the domestic situation of a poor-natural resources country. In addition, the industrial waste can widely be utilized for the recovery of precious metals in the fields of household appliance recycling and electronic part manufacture, and the recycling of industrial by-products discharged in the field of non-ferrous refinery.

Abstract: An apparatus for measuring the amount of snow cover and snowfall using electrical conduction. The apparatus includes: a collection container in which the snow is flowed and is piled up and which is opened upwards; a supporting mount for supporting the collection container; a first conductor that is disposed on a bottom of the collection container and contacts the snow piled up on the collection container; a plurality of second conductors that are disposed spaced apart from each other on sidewalls of the collection container in a height direction of the collection container and contact the snow piled up on the collection container; a power supply unit that is electrically connected to the first conductor and the plurality of second conductors; and a detection sensor for determining that the first conductor and the second conductors are electrically connected to each other, based on the snow piled up on the collection container.

Abstract: The present invention relates to a system for measuring a sample pore using a computed tomography (CT) and a standard sample and to a method thereof, more particularly to a system for measuring a sample pore using a computed tomography (CT) and a standard sample and to a method thereof, wherein the number of pixels in the count range of a cross-sectional image of the measurement sample and the number of pixels corresponding to the gray level range of the pore are calculated with reference to the count range utilized in the cross-sectional image of the standard sample and the gray level range of the pore so as to accurately measure the porosity of the measurement sample after performing a CT scan of the standard sample and the measurement sample together using a CT scanner.

Abstract: The present invention relates to a system for measuring a sample pore using a computed tomography (CT) and a standard sample and to a method thereof, more particularly to a system for measuring a sample pore using a computed tomography (CT) and a standard sample and to a method thereof, wherein the number of pixels in the count range of a cross-sectional image of the measurement sample and the number of pixels corresponding to the gray level range of the pore are calculated with reference to the count range utilized in the cross-sectional image of the standard sample and the gray level range of the pore so as to accurately measure the porosity of the measurement sample after performing a CT scan of the standard sample and the measurement sample together using a CT scanner.

Abstract: Provided is a radon reduction apparatus for groundwater disinfection. The radon reduction apparatus includes an agitation space forming body that groundwater fed through a groundwater feed pipe passes through before inflow into the groundwater storage tank and that forms a water turbine installation space whose top portion is not filled with groundwater; a water turbine located in the water turbine installation space to be rotated by groundwater when the fed groundwater falls, is run against the bottom and scattered; an oxygen supply unit supplying oxygen to groundwater before inflow of the groundwater to the agitation space forming body; a ventilating fan rotated by receiving rotary power of the water turbine and connected to the water turbine installation space to discharge air of the water turbine installation space; and an antiseptic solution supply unit supplying antiseptic solution to be mixed with the groundwater.

Abstract: The present invention relates to a magnetite-birnessite mixture, to a synthesis method therefor, and to a water-treatment method using the same. The magnetite-birnessite mixture synthesis method according to the present invention includes: a first synthesis step in which magnetite is synthesized; a second synthesis step in which manganese is made to adsorb onto the surface of the magnetite by supplying manganese while maintaining a basic state in the presence of the magnetite, and then synthesizing birnessite on the surface of the magnetite by supplying an oxidizing agent and sodium, thereby synthesizing a mixture in which magnetite and birnessite are bound together; and a purification step in which the mixture of magnetite and birnessite is purified.

Abstract: A method for extracting rare earth elements from monazite is disclosed. The method includes milling a mixture of monazite including phosphates and rare earth elements and sodium hydroxides inside a mill containing a plurality of balls to form powder by colliding the mixture into balls with each other, converting the mixture into rare earth hydroxides and sodium phosphates through the reaction occurring in the process of repeated collision, and extracting rare earth elements from the powder.

Abstract: Provided is a method for remediating arsenic-contaminated soil, including: a collection step of collecting arsenic-contaminated soil; a washing step of adding the collected soil to a washing solution, which is acidic in nature and provides reducing conditions to the soil, so as to remove arsenic from the soil and transfer the removed arsenic to the washing solution; a solid-liquid separation step of separating the soil and the washing solution from each other after the washing step; and a post-treatment step of removing arsenic from the washing solution, which was separated in the solid-liquid separation step, and employing the soil for remediation.

Abstract: A system for monitoring a concentration of carbon dioxide (CO2) in an unsaturated zone of a site in which CO2 should be stored under the ground is provided which includes: a plurality of apparatuses for detecting the concentration of CO2 in the unsaturated zone, each including a cylindrical chamber buried in an unsaturated zone under the earth surface, gas introduction holes formed in the side surface of the chamber, and a CO2 concentration sensor formed through the top of the chamber so as to measure the concentration of CO2 contained in the gas in the chamber; a plurality of communication devices transmitting the CO2 concentration output from the CO2 concentration sensor; and a monitoring server storing a reference CO2 concentration every time zone and comparing the reference CO2 concentration with the measured CO2 concentrations transmitted from the communication devices to output a normal signal or an abnormal signal.

Abstract: A ring shear apparatus for measuring a shear strength of soil samples. The ring shear apparatus considering a wall-slip effect including: an upper ring for forming a first accommodation portion having a ring shape in which soil samples are accommodated; a lower ring for forming a second accommodation portion that corresponds to the first accommodation portion of the upper ring and has a ring shape in which soil samples are accommodated, closely attached to a lower portion of the upper ring and rotatably installed relative to the upper ring; a rotating unit for rotating the lower ring relative to the upper ring; and a shear strength measuring sensor combined with the upper ring and for measuring a shear strength of the soil samples, wherein a plurality of protrusions that protrudes from the lower ring is formed on an inner circumferential surface of the lower ring along a circumferential direction of the lower ring in order to prevent the soil samples from being slid when the lower ring is rotated.

Abstract: Provided is a method of remediating cyanide-contaminated soil. The method is provided to remediate soil contaminated with cyanide and treat the cyanide, which includes collecting the soil contaminated with first cyanide in a solid state and second cyanide in a gaseous or dissolved state, dissociating cyanide by mixing the soil with an alkali washing solution, dissolving the first cyanide in a solid state in the washing solution, and transferring the second cyanide in a dissolved state dissociated from the soil to the washing solution, dissociating the soil from the washing solution, precipitating the first cyanide in a solid state by acidifying the washing solution containing the cyanide, and performing post-treatment on the first cyanide after the first cyanide precipitated in a solid state is dissociated from the washing solution.