Abstract: A process for isolating 17O from water and a process for concentrating 17O by using the same are provided. The process for isolating 17O from water includes: mixing 17O-containing water with formaldehyde to prepare an aqueous formaldehyde solution; heating the aqueous formaldehyde solution to generate a vapor mixture containing water vapor and formaldehyde vapor; and obtaining 17O-depleted water, residual formaldehyde, and a gas mixture containing hydrogen and 17O-enriched carbon monoxide, through photodissociating the vapor mixture. An 17O-enriched water production process includes: an operation of adding hydrogen to the gas mixture to induce a catalytic methanation reaction to synthesize methane (CH4) and 17O-enriched water (H217O) through methanation, the operation being carried out following the process for isolating 17O from water.

Abstract: A process for isolating 17O from water and a process for concentrating 17O by using the same are provided. The process for isolating 17O from water includes: mixing 17O-containing water with formaldehyde to prepare an aqueous formaldehyde solution; heating the aqueous formaldehyde solution to generate a vapor mixture containing water vapor and formaldehyde vapor; and obtaining 17O-depleted water, residual formaldehyde, and a gas mixture containing hydrogen and 17O-enriched carbon monoxide, through photodissociating the vapor mixture. An 17O-enriched water production process includes: an operation of adding hydrogen to the gas mixture to induce a catalytic methanation reaction to synthesize methane (CH4) and 17O-enriched water (H217O) through methanation, the operation being carried out following the process for isolating 17O from water.

Abstract: Provided is a tire including rims, beads each mounted so as to surround each of the rims, a side wall that is connected to the beads, a sub-tread that is formed on top of the side wall and is formed of a material having elasticity so as to have a changing curvature, and plural tread blocks that are arranged on the sub-tread such that the distances between the tread blocks change in accordance with the change in the curvature of the sub-tread.

Abstract: Provided is a method of separating carbon and oxygen isotopes by using a laser. In one preferred embodiment, the method includes performing a photolysis process on formaldehyde including a carbon or oxygen isotope by irradiation with ultraviolet light having a wavelength ranging from 340 nm to 360 nm to generate carbon monoxide having a carbon or oxygen isotope enriched therein and hydrogen, performing a catalytic reaction on the carbon monoxide having a carbon or oxygen isotope enriched therein and the hydrogen to synthesize carbon dioxide (CO2) and water (H2O) having a carbon or oxygen isotope enriched therein, and cooling the H2O to recover CO2 having a carbon isotope enriched therein or H2O having an oxygen isotope enriched therein.

Abstract: Provided is a tire including rims, beads each mounted so as to surround each of the rims, a side wall that is connected to the beads, a sub-tread that is formed on top of the side wall and is formed of a material having elasticity so as to have a changing curvature, and plural tread blocks that are arranged on the sub-tread such that the distances between the tread blocks change in accordance with the change in the curvature of the sub-tread.

Abstract: Provided is a method of separating carbon and oxygen isotopes by using a laser. In one preferred embodiment, the method includes performing a photolysis process on formaldehyde including a carbon or oxygen isotope by irradiation with ultraviolet light having a wavelength ranging from 340 nm to 360 nm to generate carbon monoxide having a carbon or oxygen isotope enriched therein and hydrogen, performing a catalytic reaction on the carbon monoxide having a carbon or oxygen isotope enriched therein and the hydrogen to synthesize carbon dioxide (CO2) and water (H2O) having a carbon or oxygen isotope enriched therein, and cooling the H2O to recover CO2 having a carbon isotope enriched therein or H2O having an oxygen isotope enriched therein.