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: Disclosed is a holder for measuring a permeability of an unconsolidated sediment. The holder includes a sediment installation part having a solid sediment attached to opposite ends of an unconsolidated sediment along a longitudinal direction; a transverse pressure supply part installed to surround the sediment installation part to supply a predetermined transverse pressure to the sediment installation part by using a fluid supplied from the outside; and a longitudinal pressure supply part installed at opposite ends of the transverse pressure supply part to cover opposite ends of the sediment installation part to be moved along a vertical direction so as to supply a predetermined longitudinal pressure to the sediment installation part.

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.

Abstract: There are provided an apparatus and method for groundwater sampling, using a hydraulic coupler according to the present invention. In more particular, in the groundwater sampler which is positioned at multiple depths within a groundwater borehole to simultaneously take groundwater samples at the multiple depths, couplers are each connected to both ends of a water sampling pipe made of a metal pipe material. In case of positioning the sampler at a targeted depth, a socket and a plug forming each coupler are connected to each other, so that the both ends of the water sampling pipe—to lead groundwater to freely flow in/out. Thereafter, at the targeted depth, the sockets or plugs are permitted to be separated in the couplers at the both ends of the water sampling pipe by using a lift device, so that the both ends of the water sampling pipe are sealed to simultaneously taking groundwater samples at multiple depths.

Abstract: An apparatus for dissolution experiment of mineral is disclosed. The apparatus for 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 droplet generation system includes a first nozzle configuration structured to receive a liquid and a gas under pressure in a controllable feed ratio, and to merge the liquid and gas to form an intermediate stream that is a mixture of the gas and of a dispersed phase of the liquid. A second nozzle configuration is connected to receive the intermediate stream from the first nozzle configuration and has a valve mechanism with one or more controllable operating parameters to emit a stream of droplets of the liquid. The mean size of the droplets is dependent on the controllable feed ratio of the liquid and gas and the flow rate of the stream of droplets is dependent on the controllable operating parameter(s) of the valve mechanism. A corresponding method is disclosed, as is the application of the system and method to the production of nanoparticles in a thermochemical reactor.

Abstract: A computed tomography apparatus for geological resource core analysis, more particularly to a computed tomography apparatus for geological resource core analysis in that it can conveniently utilize a computed tomography apparatus for industrial use, the movement between the CT beam transmitter and the detector is decreased, thereby performing an accurate measurement and breaking down infrequently, and especially, it can easily perform a CT scan on a cylinder type (or rod shape) sample having a very long major axis such as a geological resource core sample.

Abstract: Provided is a glucose sensor including a titanium dioxide-graphene composite having a porous structure. More particularly, the glucose sensor includes a working electrode having the titanium dioxide-graphene composite having the porous structure and an enzyme to provide features that allow a current flow to be excellent, a current to be sensitively changed depending on a change in electric potential, sensitivity to be high, and a low voltage characteristic to be excellent.

Abstract: In a method of producing carbonate mineral, a first aqueous solution containing an alkaline earth metal ion extracted from a cation exchange medium by a cation exchange reaction and carbon dioxide are added to a second aqueous solution to form a carbonate mineral.

Abstract: An apparatus for measuring trend and plunge of a geologic line feature and an auxiliary apparatus for measuring trend and plunge. The apparatus for measuring trend and plunge includes a rod operable to be disposed parallel to a lineation, a rotation block connected to an end of the rod and being operable to rotate around a central axis of the rod, the rotation block includes a hinge shaft extending in a direction perpendicular to the central axis of the rod, a plate coupled to the hinge shaft of the rotation block so that the plate is rotatable around the hinge shaft, a protractor disposed on the hinge shaft, and a measuring unit disposed on the plate, the measuring unit includes a compass configured to confirm a direction of the rod, thereby measuring the trend when the plate is horizontally disposed.

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: A method of monitoring a behavior of carbon dioxide in a stratum by using a marine Controlled-Sources Electromagnetic survey, includes: (S10) collecting a sample of sandstone at a stratum for charging carbon dioxide; (S20) calculating an effective porosity of the collected sample; (S30) measuring an electrical resistivity by saturating the collected rock sample with a pore fluid having a different concentration; (S40) forecasting a change of an electrical resistivity of stratum by charging carbon dioxide; (S50) carrying out a Marine CSEM exploration before and after charging the carbon dioxide separately in each step; and (S60) monitoring a charging behavior of carbon dioxide in stratum by a Marine CSEM exploration.

Abstract: An apparatus and method for automatic control of current electrodes in a measuring system for an electrical resistivity survey. An exemplary apparatus includes: a circuit where one pair of metal oxide semiconductor field effect transistors (MOSFETs) are connected to upper and lower terminals of n current electrodes and the one pair of MOSFETs are connected in parallel with each other; and a controller which controls ON/OFF of each MOSFET. With this, the present invention provides a stable and semipermanent apparatus for automatic control of current electrodes, which is capable of bipolar high-speed switching, and a method thereof.

Abstract: The present invention relates to an automatic seepage meter for measuring groundwater-surface water exchange in a mixed zone of stream. The present invention includes: the chamber installed in streambed sediment; the device for measuring amount of groundwater recharge through a change in water level accompanied by discharging water in the water in case of losing stream; and the device for measuring amount of groundwater discharge through a change in water level according to an increased water from the chamber to the water bath for measuring discharge in case of gaining stream.

Abstract: Provided is a measuring apparatus with AE sensors, which detects the same AE signals with respect to the same events that damage a geotechnical structure, regardless of ground conditions and formations in the geotechnical structure, thereby collecting reliable AE signals. Also, provided is(are) an installing method of the measuring apparatus with the AE sensor, and a set of the measuring apparatus with the AE sensor.

Abstract: The present disclosure provides a method for adsorption/desorption of lithium ions from brine, which employs a counter current decantation process in adsorption/desorption of lithium ions, thereby achieving an adsorption rate of 65±5% and a desorption rate of 95±3%. The method includes supplying brine into one of a plurality of adsorption reactors, adsorbing lithium ions to an adsorbent by supplying the adsorbent to the adsorption reactor to which the brine is supplied and forcing the brine and the adsorbent to sequentially flow backwards inside the respective adsorption reactors, and desorbing the lithium ions from the brine by forcing the adsorbent to which the lithium ions are adsorbed to sequentially flow backwards inside a plurality of desorption reactors. Here, the brine and the adsorbent are stirred by a stirrer to maintain the adsorbent in an intermediate state instead of settling or floating inside the respective adsorption reactors.

Abstract: Disclosed is a sludge suction apparatus for an offshore structure. The sludge suction apparatus includes a housing having an upper mounting hole and a lower mounting hole; a suction valve installed in the lower mounting hole in line with a suction hole to selectively suck sludge according to variation of internal pressure of the housing; an exhaust valve installed in the upper mounting hole to communicate with the exhaust hole and aligned coaxially with the suction valve to exhaust the sludge to an outside through the exhaust hole; a valve port coupled to an upper portion of the upper mounting hole and formed with a fixing groove coupled with an upper portion of the exhaust valve; and a piston assembly fixedly coupled with the coupling section and reciprocated in forward and rearward directions to operate the suction valve and the exhaust valve.

Abstract: The present disclosure provides an apparatus and a method for recovery of valuable metals. The apparatus includes an electrolytic chlorine producing bath, a dissolution bath disposed at a rear side of the electrolytic chlorine producing bath to perform leaching of a valuable metal content, a gas supplier connected to the dissolution bath to supply a carrier gas, a collection bath disposed at the rear side of the dissolution bath to collect a volatile material, a separation bath separating and purifying a leaching reactant generated in the dissolution bath, and chlorine and sodium hydroxide recirculation lines connecting the electrolytic chlorine producing bath, the dissolution bath and the separation bath. The apparatus permits recovery of valuable metals according to characteristics of the valuable metal, and the chlorine and sodium hydroxide recirculation lines of the apparatus provides optimized recovery rate and efficiency, thereby realizing economic feasibility.

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: An apparatus for measuring a flow velocity and a flow rate of groundwater leaking from the earth surface includes: a storage tank that is fixed to close a side surface and a top surface of an earth surface region from which the groundwater leaks and that stores the groundwater leaking from the earth surface; a liquid column tube that causes the groundwater stored in the storage tank to introduce thereto and causes a water column to rise; and a pressure-type measuring unit that is formed in a top opening of the liquid column tube and that senses a differential pressure. Accordingly, it is possible to easily and rapidly measure a flow velocity and a flow rate of groundwater leaking from the earth surface by the use of a user's terminal in real time, or by time zones, or on the user's request.