Abstract: There is provided a gas supplying apparatus capable of rapidly switching the gas to be supplied to an instrument and preventing reactive gases from mixing each other. The gas supplying apparatus comprises: a 4-way block valve which is a main switching valve 10, having two inflow ports 11, 12 and two outflow ports 13, 14; an instrument connection passage 1 connected to an instrument, such as an analyzer, to which the outflow ports 13 is connected; an exhaust passage 4 to which the two outflow ports 14 is connected; common gas supplying passages 2, 3 respectively connected to the two inflow ports 11, 12 of the 4-way block valve; a switching valve(s) 20 made of a 2-connected 3-way block valve(s) or a 4-way block valve(s) connected to the at least one of the two common gas supplying passages 2, 3; and two gas supplying passages 21, 22 switchably connected the 2-connected 3-way block valve(s) or the 4-way block valve(s).

Abstract: Gas supplying apparatus and gas substitution method where machinery and parts constituting the gas system are not damaged, and where gas substitution in the gas system is carried out in a short time with good efficiency.

Abstract: There is provided a gas supplying apparatus capable of rapidly switching the gas to be supplied to an instrument and preventing reactive gases from mixing each other. The gas supplying apparatus comprises: a 4-way block valve which is a main switching valve 10, having two inflow ports 11, 12 and two outflow ports 13, 14; an instrument connection passage 1 connected to an instrument, such as an analyzer, to which the outflow ports 13 is connected; an exhaust passage 4 to which the two outflow ports 14 is connected; common gas supplying passages 2, 3 respectively connected to the two inflow ports 11, 12 of the 4-way block valve; a switching valve(s) 20 made of a 2-connected 3-way block valve(s) or a 4-way block valve(s) connected to the at least one of the two common gas supplying passages 2, 3; and two gas supplying passages 21, 22 switchably connected the 2-connected 3-way block valve(s) or the 4-way block valve(s).

Abstract: The present invention provides an analysis system and analysis method for constantly monitoring gases, characterized in that in case there occurs a data discrepancy in an analyzer, the constant and continuous monitoring condition can be backed up while examining the cause of the problem can be carried out at the same time.

Abstract: There is provided a gas analyzing apparatus capable of minimizing gas remaining by integrating gas switching apparatuses into one and capable of analyzing impurities of ppb level to sub-ppb level contained in various kinds of high-purity gases efficiently and accurately.

Abstract: An analyzing apparatus for assaying various kinds of trace impurity contents in various kinds of high-purity gases, having an atmospheric pressure ionization mass spectrometer useful for determination of trace impurity contents in such high-purity gases on the ppb to sub ppb levels and a gas chromatograph integrated therewith, enabling high efficiency determination of trace impurity contents in high-purity gases. The analyzing apparatus having a gas chromatograph (8) and an atmospheric pressure ionization mass spectrometer (6), is provided with a system (10) for introducing a sample gas introduced from a sample gas introduction source directly to the atmospheric pressure ionization mass spectrometer (6); a system (14a, 14b) for introducing the sample gas via the gas chromatograph (8) to the atmospheric pressure ionization mass spectrometer (6); and a channel selector (11, 13, 15) for changing over the channel of the sample gas to either of these two systems.

Abstract: There is provided a gas analyzing apparatus capable of minimizing gas remaining by integrating gas switching apparatuses into one and capable of analyzing impurities of ppb level to sub-ppb level contained in various kinds of high-purity gases efficiently and accurately.

Abstract: There is provided a gas analyzing apparatus capable of minimizing gas remaining by integrating gas switching apparatuses into one and capable of analyzing impurities of ppb level to sub-ppb level contained in various kinds of high-purity gases efficiently and accurately.

Abstract: There are provided an apparatus for analyzing gases and a gas analyzing method which can securely detect presence and absence of leakage in a short time and which can carry out analyses successively, safely and accurately in a stable state. The apparatus for analyzing gases is provided with sample gas introducing systems (1 to 5) for introducing a plurality of sample gases selectively, and analyzers (6, 10 and 14), and also has means (9) for monitoring, when a sample gas under determination is changed over to another sample gas, change in the concentration of the sample gas component introduced before the change over.

Abstract: An air-fuel ratio control system for an automotive internal combustion engine provided with a three-way catalytic converter disposed in an exhaust gas passageway of the engine. The air-fuel ratio control system is comprised of an oxygen sensor disposed in the exhaust gas passageway downstream of the catalytic converter. The air-fuel ratio of air-fuel mixture to be supplied to the engine is controlled toward a stoichiometric value to cause the three-way catalytic converter to efficiently work under the action of a control unit including a microcomputer. In the control unit, a control constant is set in accordance with the output voltage of the oxygen sensor, and a cycle signal (pulse signal) is cyclically generated. The control constant is compulsorily minutely vibrated under the action of the cycle signal, thereby obtaining an air-fuel ratio correction coefficient.

Abstract: A 3-dimensional woven fabric which includes a plurality of stacked single-ply webs (A.sub.1, A.sub.2, A.sub.3, A.sub.4) each comprising a weft yarn (2) which cross-bridges between warp yarns (1) arranged in rows in each web. The adjacent webs are connected together by a second warp yarn (3) which cross-links to one of the warp yarns (1) at a cross-linking location or to the weft yarn adjacent the cross-linking location. The successive cross-linking locations are spaced in the weaving direction by at least one weft yarn course. A weaving method and a leno heald for use in producing such a fabric are described also.

Abstract: A weaving method and a leno heald system for producing a 3-dimensional woven fabric which includes a plurality of stacked single-ply webs (A.sub.1, A.sub.2, A.sub.3, A.sub.4) each comprising a weft yarn (2) which cross-bridges between warp yarns (1) arranged in rows in each web. The adjacent webs are connected together by a second warp yarn (3) which either cross-links to one of the warp yarns (1) at a cross-linking location or to the weft yarn adjacent the cross-linking location. The successive cross-linking locations are spaced in the weaving direction by at least one weft yarn course.

Abstract: In an induction system having two independent air supply lines for supplying air to two groups of engine cylinders of which firing orders are respectively discontinuous, an additional air supply passage bypassing throttle valves of the respective air supply lines has a bifurcated downstream end fluidly connected to the air supply lines.