Abstract: Provided is an ultra fine bubble production device capable of causing a liquid current to flow in a helical manner without reducing a flow rate of the liquid current while reducing the number of components. The ultra fine bubble production device includes the pipe, the compression device, and the gas bubble production medium. The gas bubble production medium is formed of a carbon-based porous material, the pipe has the side surface having a cylindrical shape and the end surfaces having a circular shape, the liquid current inflow port is provided on the side surface, the cylindrical guide member is arranged so as to be connected to the liquid current inflow port, and the guide member has the guide groove having a helical shape.

Abstract: Provided a ground drilling device capable of reducing the maintenance time by suppressing wear of the rotary blade, extending the life of each component, and reducing the frequency of drilling pipes. The ground drilling device includes: the rotary blade that excavates the ground; the lubricating liquid jetting device that jets the lubricating liquid to the rotary blade when excavating the ground, and the oxygen supply device that supplies oxygen to the lubricating liquid, in which the oxygen supply device has the bubble generating medium for supplying oxygen in a high pressure state as fine bubbles to the lubricating liquid.

Abstract: Provided is a plant cultivation method that promotes plant growth and improves plant quality; also provided is a plant cultivation device. The plant cultivation method uses a nutrient liquid supply device that supplies a nutrient liquid to a plant, a fine bubble-generating device, a spraying device, and a control device. The plant cultivation method carries out plant cultivation by supplying the nutrient liquid in mist form, and comprises a first step in which an oxygen-containing gas is supplied as the gas into the nutrient liquid and the fine bubble-containing nutrient liquid is sprayed on the leaf surface of a plant, and a second step in which, after the first step, a carbon dioxide-containing gas is supplied as the gas into the nutrient liquid and the fine bubble containing nutrient liquid is sprayed on the leaf surface of the plant.

Abstract: A small diameter sheath heater with improved reliability is provided. The sheath heater according to one embodiment of the present invention includes a metal sheath, a heating wire having a band shape, the heating wire arranged with a gap within the metal sheath so as to rotate with respect to an axis direction of the metal sheath, an insulating material arranged in the gap, and connection terminals arranged at one end of the metal sheath, the connection terminals electrically connected with both ends of the heating wire respectively.

Abstract: Provided are a hydrocarbon production method and a hydrocarbon production apparatus that, in a mining process, can transport proppant efficiently even if the viscosity is low and can prevent microbial contamination, and, in a desulfurization process, can improve the efficiency of desulfurization. This hydrocarbon production method comprises a hydrocarbon well mining step in which hydraulic fracture fluid is used to break up bedrock by hydraulic pressure and mine the hydrocarbon embedded in the interior of the bedrock, and a desulfurization step in which sulfur contained in the hydrocarbon mined in the mining step is removed, wherein: the hydraulic fracture fluid contains a base fluid, a proppant that supports a fracture 110, and a thickener; and air bubbles less than 100 ?m in size (diameter) under normal pressure are caused to be jointly present in the hydraulic fracture fluid.

Abstract: Provided is an ultrafine bubble generation device for aquaculture or wastewater treatment with which it is possible to efficiently cause ultrafine bubbles to be dissolved or to coexist, and to increase the concentration of a gas in the liquid. An ultrafine bubble generation device for aquaculture or wastewater treatment provided with a channel for channeling a liquid, a compression device for pumping a gas into the channel, and a bubble generation medium for releasing the gas pumped by the compression device as ultrafine bubbles into the liquid in the channel, wherein the bubble generation medium is formed from a carbon-based porous material and is disposed so as to be horizontal or below horizontal with respect to the direction of flow of the liquid in the channel.

Abstract: Provided are a hydrocarbon production method and a hydrocarbon production apparatus that, in a mining process, can transport proppant efficiently even if the viscosity is low and can prevent microbial contamination, and, in a desulfurization process, can improve the efficiency of desulfurization. This hydrocarbon production method comprises a hydrocarbon well mining step in which hydraulic fracture fluid is used to break up bedrock by hydraulic pressure and mine the hydrocarbon embedded in the interior of the bedrock, and a desulfurization step in which sulfur contained in the hydrocarbon mined in the mining step is removed, wherein: the hydraulic fracture fluid contains a base fluid, a proppant that supports a fracture 110, and a thickener; and air bubbles less than 100 ?m in size (diameter) under normal pressure are caused to be jointly present in the hydraulic fracture fluid.

Abstract: A small diameter sheath heater with improved reliability is provided. The sheath heater according to one embodiment of the present invention includes a metal sheath, a heating wire having a band shape, the heating wire arranged with a gap within the metal sheath so as to rotate with respect to an axis direction of the metal sheath, an insulating material arranged in the gap, and connection terminals arranged at one end of the metal sheath, the connection terminals electrically connected with both ends of the heating wire respectively.

Abstract: Provided is an ultrafine bubble generation device for aquaculture or wastewater treatment with which it is possible to efficiently cause ultrafine bubbles to be dissolved or to coexist, and to increase the concentration of a gas in the liquid. An ultrafine bubble generation device for aquaculture or wastewater treatment provided with a channel for channeling a liquid, a compression device for pumping a gas into the channel, and a bubble generation medium for releasing the gas pumped by the compression device as ultrafine bubbles into the liquid in the channel, wherein the bubble generation medium is formed from a carbon-based porous material and is disposed so as to be horizontal or below horizontal with respect to the direction of flow of the liquid in the channel.

Abstract: Provided is a super-micro bubble generation device providing super-micro bubbles using a simple method and having a higher degree of freedom of installation so as to be suitable for a place where the device is to meet functional requirements. A super-micro bubble generation device is provided with a compressor for delivering gas under pressure, and also with a bubble generation medium for discharging the gas, which has been delivered under pressure, as super-micro bubbles into liquid. The bubble generation medium consists of a high-density compound which is an electrically conductive substance. The super-micro bubble generation device is also provided with a liquid jetting device for jetting liquid in the direction substantially perpendicular to the direction in which the bubble generation medium discharges the super-micro bubbles, said liquid being the same kind of liquid as the liquid into which the super-micro bubbles are discharged.

Abstract: Provided is a super-micro bubble generation device providing super-micro bubbles using a simple method and having a higher degree of freedom of installation so as to be suitable for a place where the device is to meet functional requirements. A super-micro bubble generation device is provided with a compressor for delivering gas under pressure, and also with a bubble generation medium for discharging the gas, which has been delivered under pressure, as super-micro bubbles into liquid. The bubble generation medium consists of a high-densit com s ound which is an electrically conductive substance. The super-micro bubble generation device is also provided with a liquid jetting device for jetting liquid in the direction substantially perpendicular to the direction in which the bubble generation medium discharges the super-micro bubbles, said liquid being the same kind of liquid as the liquid into which the super-micro bubbles are discharged.