Abstract: An online system receives information describing a target group of online system users from a third party system and stores the information describing the target group. The online system subsequently uses the target group to select content for presentation to one or more users. For example, users included in the target group are identified as eligible to be presented with content items. Content items are associated with objectives satisfied when a specified interaction with the content item, or with an object associated with the content item, is received. Based on revenue obtained by the online system from presenting content based on the target group as well as interactions satisfying objectives associated with various presented content, the online system determines a monetization value for the target group. Based on the monetization value, the online system determines whether to continue storing the information describing the target group.

Abstract: An online system receives information describing a target group of online system users from a third party system and determines whether to store the information describing the target group. Online system users included in the target group are identified and scores are determined for each of the identified user. A score associated with a user represents the online system's effectiveness in targeting content to the user via targeting criteria maintained by the online system. Based on the scores, the online system determines a group score associated with the target group and stores the information describing the target group if the group score satisfies one or more criteria. If the information describing the target group is stored, the online system may determine whether to continue storing the information describing the target group based on revenue obtained by the online system from presenting content based on the target group.

Abstract: An online system receives information describing a target group of online system users from a third party system and stores the information describing the target group. The online system subsequently uses the target group to select content for presentation to one or more users. For example, users included in the target group are identified as eligible to be presented with content items. Based on revenue obtained by the online system from presenting content based on the target group, the online system determines a monetization value for the target group. The online system determines whether to continue storing the information describing the target group based on the monetization value.

Abstract: An online system receives information describing a target group of online system users from a third party system and stores the information describing the target group. The online system subsequently uses the target group to select content for presentation to one or more users. For example, users included in the target group are identified as eligible to be presented with content items. Content items are associated with objectives satisfied when a specified interaction with the content item, or with an object associated with the content item, is received. Based on revenue obtained by the online system from presenting content based on the target group as well as interactions satisfying objectives associated with various presented content, the online system determines a monetization value for the target group. Based on the monetization value, the online system determines whether to continue storing the information describing the target group.

Abstract: An online system matches a user with a user of a third party system by comparing user identifying information maintained by the online system with user identifying information maintained by the third party system. To determine how accurately different types of user identifying information identify an online system user, types of user identifying information maintained by the online system are compared to types of user identifying information maintained by the third party system. A score is associated with various online system users based on the number of types of user identifying information associated with the user by the online system matching types of user identifying information associated with a third party system user. Based on the scores associated with different users, a measure of accuracy in identifying an online system user is determined for each type of user identifying information.

Abstract: An online system receives information describing a target group of online system users from a third party system and stores the information describing the target group. The online system subsequently uses the target group to select content for presentation to one or more users. For example, users included in the target group are identified as eligible to be presented with content items. Content items are associated with objectives satisfied when a specified interaction with the content item, or with an object associated with the content item, is received. Based on revenue obtained by the online system from presenting content based on the target group as well as interactions satisfying objectives associated with various presented content, the online system determines a monetization value for the target group. Based on the monetization value, the online system determines whether to continue storing the information describing the target group.

Abstract: An oil ring for an internal combustion engine is provided that can prevent adhesion and deposition of oil sludge even during long-time operation of the engine, can thereby prevent the occurrence of sticking of the oil ring components to each other, and can maintain a good oil control function. At least part of the surface of the oil ring for an internal combustion engine is coated with a metal coating having a surface free energy of 40 mJ/m2 or less and a hydrogen bonding strength of 1.0 mJ/m2 or less. A coating of Ni, Cu, or an alloy containing Ni or Cu is used as the metal coating.

Abstract: An online system matches a user with a user of a third party system by comparing user identifying information maintained by the online system with user identifying information maintained by the third party system. To determine how accurately different types of user identifying information identify an online system user, types of user identifying information maintained by the online system are compared to types of user identifying information maintained by the third party system. A score is associated with various online system users based on the number of types of user identifying information associated with the user by the online system matching types of user identifying information associated with a third party system user. Based on the scores associated with different users, a measure of accuracy in identifying an online system user is determined for each type of user identifying information.

Abstract: An online system receives information describing a target group of online system users from a third party system and determines whether to store the information describing the target group. Online system users included in the target group are identified and scores are determined for each of the identified user. A score associated with a user represents the online system's effectiveness in targeting content to the user via targeting criteria maintained by the online system. Based on the scores, the online system determines a group score associated with the target group and stores the information describing the target group if the group score satisfies one or more criteria. If the information describing the target group is stored, the online system may determine whether to continue storing the information describing the target group based on revenue obtained by the online system from presenting content based on the target group.

Abstract: An online system receives information describing a target group of online system users from a third party system and stores the information describing the target group. The online system subsequently uses the target group to select content for presentation to one or more users. For example, users included in the target group are identified as eligible to be presented with content items. Based on revenue obtained by the online system from presenting content based on the target group, the online system determines a monetization value for the target group. The online system determines whether to continue storing the information describing the target group based on the monetization value.

Abstract: An engine part coated with an engine-parts-coating composition comprising (i) at least one of a polyfluoroalkyl group and a polyfluoropolyether group, (ii) an organopolysiloxane group, and (iii) an alkoxysilyl group.

Abstract: An engine part coated with an engine-parts-coating composition comprising (i) at least one of a polyfluoroalkyl group and a polyfluoropolyether group, (ii) an organopolysiloxane group, and (iii) an alkoxysilyl group.

Abstract: An oil ring for an internal combustion engine is provided that can prevent adhesion and deposition of oil sludge even during long-time operation of the engine, can thereby prevent the occurrence of sticking of the oil ring components to each other, and can maintain a good oil control function. At least part of the surface of the oil ring for an internal combustion engine is coated with a metal coating having a surface free energy of 40 mJ/m2 or less and a hydrogen bonding strength of 1.0 mJ/m2 or less. A coating of Ni, Cu, or an alloy containing Ni or Cu is used as the metal coating.

Abstract: A fuel cell separator having excellent corrosion resistance, electric conductivity and durability comprising a substrate made of austenitic stainless steel, and a nitride layer formed on a surface of the substrate in contact with an oxygen electrode or a current collector on the oxygen electrode side, the nitride layer comprising a solid solution compound phase composed of an Fe4N crystal, in which part of Fe is substituted by at least Cr and Ni.

Abstract: A fuel cell separator having excellent corrosion resistance, electric conductivity and durability comprising a substrate made of austenitic stainless steel, and a nitride layer formed on a surface of the substrate in contact with an oxygen electrode or a current collector on the oxygen electrode side, the nitride layer comprising a solid solution compound phase composed of an Fe4N crystal, in which part of Fe is substituted by at least Cr and Ni.

Abstract: A low-cost solid polymer electrolyte fuel cell unit including a metal separator is provided. The cell unit has a structure that may have high corrosion resistance and durability. The solid polymer electrolyte fuel cell unit includes a polymer electrolyte membrane, a pair of gas-diffusible electrodes fixed at opposing surfaces of the polymer electrolyte membrane, a pair of gas-diffusible porous conductive graphite collectors fixed in contact with the outer sides of the electrodes; a pair of aluminum separators for introducing a fuel gas and an oxygen-containing gas to the electrodes separately from one another, and porous conductive buffer layers provided between the separator and the graphite collector, and having flexibility and air permeability. The separator surfaces in contact with the buffer layers are each provided with a conductive coating having a thickness in the range from 0.01 ?m to 20 ?m.

Abstract: A method for supplying hydrogen to a fuel cell comprising (a) a medium-reducing step, which comprises reforming a liquid fuel to generate a reformed gas containing hydrogen and carbon monoxide, and supplying the reformed gas to a hydrogen-purifying unit containing a carbon monoxide-oxidizing catalyst and a hydrogen-generating medium to reduce the hydrogen-generating medium and oxidize the carbon monoxide; and (b) a medium-oxidizing step, which comprises supplying steam to a hydrogen-purifying unit containing a carbon monoxide-oxidizing catalyst and a hydrogen-generating medium, to generate hydrogen while oxidizing the hydrogen-generating medium, the medium-reducing step and the medium-oxidizing step being conducted alternately.

Abstract: A polymer electrolyte fuel cell unit comprising (a) a polymer electrolyte membrane 2, (b) a pair of gas-diffusible electrodes 3, 4 respectively attached to both surfaces of the polymer electrolyte membrane 2, (c) a pair of porous, gas-diffusible, conductive graphite collectors 5, 5 in contact with the outside of the electrodes 3, 4, and (d) a pair of metal separators 7, 7 for introducing a fuel gas and an oxygen-containing gas separately into the electrodes 3, 4; a porous, conductive buffer layers 6, 6 having flexibility and gas permeability being provided between the metal separators 7, 7 and the graphite collectors 5, 5; and said metal separator 7, 7 being provided with a conductive, corrosion-resistant coating 9, 9 having a thickness of 0.01 to 10 ?m, whose polarization current is 10 ?A/cm2 or less when measured by an electrochemical polarization evaluation method, at least on a surface in contact with said porous, conductive buffer layer 6, 6.

Abstract: A bipolar current collector separator for a fuel cell composed of a metal plate having flow channels and contact faces that come into contact with electrodes or collectors, wherein a corrosion-resistant layer such as an anodized aluminum layer and a heat-resistant polymer layer is disposed on each of the flow channels.

Abstract: A low-cost solid polymer electrolyte fuel cell unit including a metal separator is provided. The cell unit has a structure that may have high corrosion resistance and durability. The solid polymer electrolyte fuel cell unit includes a polymer electrolyte membrane, a pair of gas-diffusible electrodes fixed at opposing surfaces of the polymer electrolyte membrane, a pair of gas-diffusible porous conductive graphite collectors fixed in contact with the outer sides of the electrodes; a pair of aluminum separators for introducing a fuel gas and an oxygen-containing gas to the electrodes separately from one another, and porous conductive buffer layers provided between the separator and the graphite collector, and having flexibility and air permeability. The separator surfaces in contact with the buffer layers are each provided with a conductive coating having a thickness in the range from 0.01 &mgr;m to 20 &mgr;m.