Abstract: To regenerate, by a simple method, an inorganic separation membrane separating non-hydrocarbon gas contained in treatment target gas. Provided in separating the non-hydrocarbon gas contained in the treatment target gas is a regeneration gas supply path supplying moisture-containing regeneration gas to a primary side of the inorganic separation membrane in a separation membrane module. As a result, it is possible to regenerate the inorganic separation membrane by supplying moisture-containing CO2 gas to the inorganic separation membrane and then supplying dry natural gas. Accordingly, there is no need to use dry regeneration gas and the CO2 gas supplied via, for example, a pipeline can be used as it is.

Abstract: To regenerate, by a simple method, an inorganic separation membrane separating non-hydrocarbon gas contained in treatment target gas. Provided in separating the non-hydrocarbon gas contained in the treatment target gas is a regeneration gas supply path supplying moisture-containing regeneration gas to a primary side of the inorganic separation membrane in a separation membrane module. As a result, it is possible to regenerate the inorganic separation membrane by supplying moisture-containing CO2 gas to the inorganic separation membrane and then supplying dry natural gas. Accordingly, there is no need to use dry regeneration gas and the CO2 gas supplied via, for example, a pipeline can be used as it is.

Abstract: The present technology provides a rubber composition containing: from 20 to 40 parts by weight of carbon black, from 15 to 30 parts by weight of silica, from 2.0 to 3.5 parts by weight of sulfur, and a sulfur-containing silane coupling agent, per 100 parts by weight of diene rubber that contains from 80 to 100 wt. % of natural rubber, and from 20 to 0 wt. % of isoprene rubber; the total amount of sulfur in the sulfur and the sulfur-containing silane coupling agent being from 2.3 to 4.0 parts by weight.

Abstract: A rubber composition for a tire for heavy loads of the present technology comprises: diene rubber containing at least 60% by mass of natural rubber; silica; carbon black; and a silane coupling agent. The silane coupling agent is polysiloxane represented by a specific average compositional formula. The content of the silica is from 5 to 50 parts by mass per 100 parts by mass of the diene rubber. The content of the carbon black is from 5 to 40 parts by mass per 100 parts by mass of the diene rubber. The total content of the silica and the carbon black (R) is from 30 to 70 parts by mass per 100 parts by mass of the diene rubber. The content of the silane coupling agent is from 2 to 20% by mass of the silica content.

Abstract: The rubber composition of the present technology comprises: from 35 to 50 parts by weight of silica, from 1.5 to 3.5 parts by weight of sulfur, carbon black, a sulfenamide vulcanization accelerator, and a sulfur-containing silane coupling agent per 100 parts by weight of a diene rubber containing from 80 to 100 wt. % of a natural rubber; a total amount of the sulfur and the sulfur in the sulfur-containing silane coupling agent being from 1.85 to 6.0 parts by weight; and a compounded amount of the sulfenamide vulcanization accelerator being from A parts by weight to 2.6 parts by weight both inclusive, where A is determined by the formula A=0.2209S2?1.409S+1.309Y+2.579, where S is the compounded amount of the sulfur and Y is a positive number.

Abstract: A rubber composition for a tire for heavy loads of the present technology comprises: diene rubber containing at least 60% by mass of natural rubber; silica; carbon black; and a silane coupling agent. The silane coupling agent is polysiloxane represented by a specific average compositional formula. The content of the silica is from 5 to 50 parts by mass per 100 parts by mass of the diene rubber. The content of the carbon black is from 5 to 40 parts by mass per 100 parts by mass of the diene rubber. The total content of the silica and the carbon black (R) is from 30 to 70 parts by mass per 100 parts by mass of the diene rubber. The content of the silane coupling agent is from 2 to 20% by mass of the silica content.

Abstract: The present technology provides a rubber composition containing: from 20 to 40 parts by weight of carbon black, from 15 to 30 parts by weight of silica, from 2.0 to 3.5 parts by weight of sulfur, and a sulfur-containing silane coupling agent, per 100 parts by weight of diene rubber that contains from 80 to 100 wt. % of natural rubber, and from 20 to 0 wt. % of isoprene rubber; the total amount of sulfur in the sulfur and the sulfur-containing silane coupling agent being from 2.3 to 4.0 parts by weight.

Abstract: A rubber composition for an under tread of a tire comprises: relative to 100 parts by weight of diene rubber, from 15 to 45 parts by weight of carbon black and from 3 to 30 parts by weight of silica. An N2SA of the carbon black is from 35 to 85 m2/g and a DBP absorption number of the carbon black is from 105 to 200 mL/100 g. A difference between a sulfur content of the rubber composition for the under tread (Y parts by weight) and a sulfur content of the rubber composition for coating that forms the belt layers (X parts by weight) (?=X?Y) is 4.5 or less, and a difference between the rubber hardness A of the cap tread and the rubber hardness B of the under tread (?=A?B) is from 5 to 12.

Abstract: Provided is a pneumatic tire in which the deterioration of a tire material over time can be visually checked from its external appearance to determine the service life of the tire. The tire is characterized by including a deterioration indicator 7 formed by arranging two or more areas in a row. Time taken before a crack occurrence due to an environmental factor and/or a use factor is different among two or more areas. The deterioration indicator 7 is disposed in an exposed portion, other than a tread surface 1, of the tire.