Abstract: A power generation cell of a fuel cell stack is equipped with a tunnel part that connects a coolant supply passage and a coolant flow field to each other. The tunnel part includes a first protrusion protruding from the first metal separator toward the resin frame member, and a first placement portion including a first seal placement surface on which the first resin seal member is disposed. The first seal placement surface is positioned in an opposite direction, with respect to the resin frame member, compared with a first end surface of the first protrusion in a protruding direction.

Abstract: An observation control device is applicable to a detector installed onboard a spacecraft for performing observation. The observation control device includes an orthogonal direction control unit configured to move an observation range in a direction orthogonal to a travel direction of the spacecraft, the observation range being a range observed by the detector, and a travel direction control unit configured to move the observation range in the travel direction of the spacecraft.

Abstract: In power generation cells of a fuel cell stack, a first sealing portion of a first metal separator is an elastically deformable metal sealing portion protruding from the first metal separator in a direction away from a membrane electrode assembly, a second sealing portion of a second metal separator is an elastically deformable resin seal member attached to a surface of the second metal separator that is opposite to a surface facing the membrane electrode assembly, and the resin seal member is in contact with the metal sealing portion.

Abstract: A power generation cell of a fuel cell stack includes a resin-framed membrane electrode assembly, a first separator, and a second separator. A second gas flow field for allowing a reactant gas to flow along an electrode surface of the membrane electrode assembly is formed on the second separator, and a first connection flow path in communication with an oxygen-containing gas supply passage is formed on the first separator, and a first through-hole connecting the second gas flow field and the first connection flow path to each other is formed in the frame member.

Abstract: A rail has excellent fatigue crack propagation resistance characteristics, wherein the rail has a component composition including C: 0.80 to 1.30 mass %, Si: 0.10 to 1.20 mass %, Mn: 0.20 to 1.80 mass %, P: not more than 0.035 mass %, S: 0.0005 to 0.012 mass %, Cr: 0.20 to 2.50 mass % and the remainder being Fe and inevitable impurities and satisfying CP represented by equation (1) being not more than 2500: CP=X/RA??(1) and X={(10×[% C])+([% Si]/12)+([% Mn]/24)+([% Cr]/21)}5??(2), where [% Y] is content of an element Y (mass %), and RA is a prior austenite grain size (?m).

Abstract: A rail includes a foot, a web, and a head. The web has a chemical composition containing C: 0.70 to 1.20 mass%, Si: 0.20 to 1.20 mass%, Mn: 0.20 to 1.50 mass%, P: 0.035 mass% or less, and Cr: 0.20 to 2.50 mass%, with the balance being Fe and incidental impurities. The area fraction of pearlite in the web is 95% or more, and the average size of pearlite blocks is 60 µm or less.

Abstract: A case hardening steel having excellent fatigue resistance is provided at relatively low production cost. A case hardening steel has a chemical composition containing C: 0.10% to 0.30%, Si: 0.10% to 1.20%, Mn: 0.30% to 1.50%, S: 0.010% to 0.030%, Cr: 0.10% to 1.00%, B: 0.0005% to 0.0050%, Sb: 0.005% to 0.020%, and N: 0.0150% or less in a predetermined range, and further containing Al: 0.010%?Al?0.120% in the case where B?(10.8/14)N?0.0003%, and 27/14[N?(14/10.8)B+0.030]?Al?0.120% in the case where B?(10.8/14)N<0.0003%.

Abstract: A fluid flow field of a separator of a fuel cell stack allows a fluid to flow in a separator surface direction. A rubber seal member provides a seal between the fluid passage and the fluid flow field. The tunnel portion intersects the rubber seal member at an intersection. The tunnel portion allows the fluid flow field and the fluid passage to connect to each other. In the rubber seal member, a first portion protrudes from a flat portion in a stacking direction, and a second portion protrudes from a protruding end surface of a tunnel portion in the stacking direction.

Abstract: The rail having a chemical composition containing C: 0.70-0.85 mass %, Si: 0.50-1.60 mass %, Mn: 0.20-1.00 mass %, P: 0.035 mass % or less, S: 0.012 mass % or less, Cr: 0.40-1.30 mass %, the chemical composition satisfying the formula (1) 0.30?[% Si]/10+[% Mn]/6+[% Cr]/3?0.55??(1) where [% M] is the content in mass % of the element M, the balance being Fe and inevitable impurities, where Vickers hardness of a region between positions where a depth from a surface of a rail head of 0.5 and 25 mm is ?370 HV and <520 HV, a total area ratio of a pearlite microstructure and a bainite microstructure in the region is ?98%, and an area ratio of the bainite microstructure in the region is >5% and <20%.

Abstract: The rail having a chemical composition containing C: 0.70-1.00 mass %, Si: 0.50-1.60 mass %, Mn: 0.20-1.00 mass %, P: ?0.035 mass %, S: ?0.012 mass %, Cr: 0.40-1.30 mass %, where Ceq defined by the formula (1) is 1.04-1.25, Ceq=[% C]+([% Si]/11)+([% Mn]/7)+([% Cr]/5.8)??(1) where [% M] is the content in mass % of the element M, the balance being Fe and inevitable impurities, where Ceq(max) is ?1.40, where the Ceq(max) is determined by the formula (2) using maximum contents of C, Si, Mn, and Cr obtained by subjecting a region between specified positions to EPMA line analysis; and a pearlite area ratio in the region is 95% or more, Ceq(max)=[% C(max)]+([% Si(max)]/11)+([% Mn(max)]/7)+([% Cr(max)]/5.8)??(2) where [% M(max)] is the maximum content of the element M.

Abstract: In one aspect, the present disclosure provides a method for producing an aluminum platter, which can improve the smoothness of the substrate surface before a magnetic layer is formed thereon and can provide a hard disk substrate that can be processed into a medium with a high yield. In another aspect, the present disclosure relates to a method for producing an aluminum platter, including the following steps 1 and 2: step 1: bringing a composition containing a compound (component A) that has at least one structure represented by the following formula (I) and has a molecular weight between 50 and 100,000 inclusive into contact with a substrate surface of a Ni—P plated aluminum alloy substrate; and step 2: forming a magnetic layer on the substrate obtained in the step 1.

Abstract: The purpose of the present invention is to provide an observation control device, an observation system, a spacecraft, an observation control method, and an observation control program which enable stable observation. An observation control device 60 applicable to a plurality of sensor systems (#1 to #n) mounted on a spacecraft for the purpose of observation is provided with: a determination unit that determines whether each of the sensor systems (#1 to #n) is in a normal observable state; and an adjustment unit that, when at least one of the sensor systems (#1 to #n) is determined not to be in a normal observable state, adjusts the allocation state of a target searching and/or tracking function in sensors, among the sensor systems (#1 to #n), determined to be in the normal observable state.

Abstract: A fluid flow field of a separator of a fuel cell stack allows a fluid to flow in a separator surface direction. A rubber seal member provides a seal between the fluid passage and the fluid flow field. The tunnel portion intersects the rubber seal member at an intersection. The tunnel portion allows the fluid flow field and the fluid passage to connect to each other. In the rubber seal member, a first portion protrudes from a flat portion in a stacking direction, and a second portion protrudes from a protruding end surface of a tunnel portion in the stacking direction.

Abstract: A command control system includes an interception predicting section and an assigning section. The interception predicting section calculates a predicted intercept point of a target to be shot down and a guided missile to shoot down the target. The assigning section acquires first weather data of the predicted intercept point, and generates a launching instruction based on the first weather data so as to launch one of a first guided missile and a second guided missile as the guided missile. A method by which the first guided missile detects the target and a method by which the second guided missile detects the target are different.

Abstract: Disclosed are a case hardened steel which is suitable as a material for producing mechanical structural parts having high rotating bending fatigue strength and impact fatigue strength at a relatively low cost, and a method of producing the same. The case hardening steel has a chemical composition containing, by mass %, C, Si, Mn, P, S, Cr, Mo, B, Ti, N, and O within a range satisfying a predetermined relationship, and Al in at least a predetermined amount in relation to the B, N, and Ti contents, with the balance being Fe and inevitable impurities, wherein ?I?80 is satisfied, where I represents an area in ?m2 of an oxide-based inclusion located at the center of a fish-eye on a fracture surface of the case hardening steel after being subjected to carburizing-quenching and tempering and subsequently to a rotating bending fatigue test.

Abstract: A jet engine has an inlet 11 configured to introduce air, and a combustor 12 having a fuel injection port 30a that injects a fuel, and configured to combust the fuel injected from the fuel injection port 30a by using the air. The combustor 12 has a separation section 14 defining the air passage FA through which the air flows, between a rear end 15 of the inlet and the fuel injection port 30a. A plurality of turbulent flow generating sections (20;25) are arranged in the separation section 14 to makes the air flow turbulent. Each of the plurality of turbulent flow generating sections (20;25) contains a member (21;22;25B) which can restrain the turbulence of the air flow by moving or disappearing. It can be prevented that a high-pressure region reaches the inlet so that the thrust of the jet engine is reduced.

Abstract: A case hardening steel suitable as raw material for producing a mechanical structural part having high rotating bending fatigue strength and pitting fatigue strength at relatively low cost and a method of producing the case hardening steel are provided. A case hardening steel comprises a chemical composition containing, in mass %, C, Si, Mn, P, S, Cr, Mo, Al, N, and O in a predetermined relationship, with a balance being Fe and inevitable impurities, wherein ?I?80 (where I denotes an area (?m2) of an oxide-based inclusion located in a fish eye central portion at a fracture surface after subjecting the case hardening steel to carburizing-quenching and tempering and then performing a rotating bending fatigue test).

Abstract: An observation control device applicable to a detector installed onboard a spacecraft for performing observation comprises an orthogonal direction control unit that moves an observation range in a direction orthogonal to a travel direction of the spacecraft, the observation range being a range observed by the detector, and a travel direction control unit that moves the observation range in the travel direction of the spacecraft.

Abstract: The rail having a chemical composition containing C: 0.70-1.00 mass %, Si: 0.50-1.60 mass %, Mn: 0.20-1.00 mass %, P: ?0.035 mass %, S: ?0.012 mass %, Cr: 0.40-1.30 mass %, where Ceq defined by the formula (1) is 1.04-1.25, Ceq=[% C]+([% Si]/11)+([% Mn]/7)+([% Cr]/5.8) ??(1) where [% M] is the content in mass % of the element M, the balance being Fe and inevitable impurities, where Ceq(max) is ?1.40, where the Ceq(max) is determined by the formula (2) using maximum contents of C, Si, Mn, and Cr obtained by subjecting a region between specified positions to EPMA line analysis,; and a pearlite area ratio in the region is 95% or more, Ceq(max)=[% C(max)]+([% Si(max)]/11)+([% Mn(max)]/7)+([% Cr(max)]/5.8) ??(2) where [% M(max)] is the maximum content of the element M.

Abstract: In one aspect, the present disclosure provides a method for producing an aluminum platter, which can improve the smoothness of the substrate surface before a magnetic layer is formed thereon and can provide a hard disk substrate that can be processed into a medium with a high yield. In another aspect, the present disclosure relates to a method for producing an aluminum platter, including the following steps 1 and 2: step 1: bringing a composition containing a compound (component A) that has at least one structure represented by the following formula (I) and has a molecular weight between 50 and 100,000 inclusive into contact with a substrate surface of a Ni—P plated aluminum alloy substrate; and step 2: forming a magnetic layer on the substrate obtained in the step 1.