Abstract: Provided is a sub-sampler used for taking a sub-sample from a core sample filled in a liner of a corer. The sub-sampler includes agitation preventing walls 100a, 100b and 100c including a top surface 10 having a predetermined length, a side surface 20 extended to be bent in a downward direction from one end of the top surface 10, and a contact surface 30 extended such that one end of the side surface meets the other end of the top surface 10; and a cut piece 200 that allows an arrangement gap between one agitation preventing wall 100a and any other agitation preventing wall 100b to be regular and that is connected to the side surface 20 in order to close one side surface of the arranged agitation preventing walls 100a, 100b and 100c.

Abstract: Provided is a method for preparing plate-like ultrafine particles of flaky graphite having an average graphite plate diameter of 3-5 ?m and a graphite plate thickness of 20-60 nm, including: grinding natural flaky graphite to control the particle size to 5-15 ?m; dipping the ground flaky graphite into an aqueous solution containing an acid and an oxidizing agent, followed by washing and drying, to form a graphite intercalation compound in the ground flaky graphite; carrying out gasification of the graphite intercalation compound via low-temperature heat treatment to expand the flaky graphite to 20-30%; and carrying out wet grinding of the expanded flaky graphite at a slurry concentration of 20-28 wt %. The ultrafine particles of flaky graphite disclosed herein have a narrow particle size distribution, and maintain unique properties of flaky graphite due to the lack of interlayer collapse in flaky graphite particles.

Abstract: The present invention relates to a core catcher and a corer having the same, and more particularly, to a core catcher provided with dual blade radial pins for preventing loss of sediments and a corer having the same.

Abstract: A pipe well; a ground water outlet pipe inserted into the pipe well; a submerged pump installed at the ground water outlet pipe; a heat exchanger in which the ground water is circulated and terrestrial heat of the ground water is heat-exchanged; a collection pipe collects the ground water circulated through the heat exchanger into the pipe well; a connection pipe which connects the submerged pump and the heat exchanger; an auto temperature bypass apparatus which is installed at the connection pipe to automatically bypass the ground water from the connection pipe when a temperature of the ground water arrives at a predetermined value; a discharge pipe through which the ground water bypassed is discharged; and a ground water restoration hole adjacent to the pipe well in which the discharge pipe is inserted to fill up the ground water nearby.

Abstract: Provided is an apparatus for dissolving noble metals, including: a sealed dissolution reactor provided with agitators; a sealed electrolysis type chlorine producing unit for supplying chlorine gas produced via electrolysis to the dissolution reactor; a pH adjusting unit for controlling and maintaining pH of the liquid inside the dissolution reactor to convert the chlorine gas supplied to the dissolution reactor into a chlorine compound; and an inorganic material extraction unit for extracting inorganic materials from the liquid received from the dissolution reactor via heating/evaporation, wherein the pH adjusting unit controls pH of the liquid inside the dissolution reactor in such a manner that the chlorine compound is produced, the noble metal in a noble metal-containing sample introduced into the dissolution reactor is dissolved by the chlorine compound, and the liquid evaporated from the inorganic material extraction unit is recycled to the dissolution reactor.

Abstract: There is provided a method for manufacturing oligomer/halloysite composite material including the steps of: adding halloysite powder to an oligomer solution to be mixed; heating the mixed material to expand air inside of halloysite nanotube; and filling the oligomer solution inside of the halloysite nanotube by cooling the mixed material to a room temperature.

Abstract: The invention relates to a method for making silica nanoparticles using a flame reactor, which includes a droplet spray having a two-fluid nozzle and a burner of a quintuple tube structure. In this method, droplets of silicon alkoxide as liquid Si compound are sprayed through the droplet spray of the flame reactor. A flame is generated by the flow of inert gas, oxygen, hydrogen and air simultaneously into the burner of the flame reactor. The liquid Si compound is delivered through the flame of the burner to produce silica nanoparticles having a mean particle size ranging from 9 nm to 68 nm. Resultant nanoparticles are collected and recovered in a particle collector. The droplets sprayed under high pressure from a silicon alkoxide solution are directly oxidized in the flame, thereby producing spherical silica nanoparticles.