Abstract: Photoactive compounds are disclosed. The disclosed photoactive compounds include metal complexes with dipyrromethene-based ligands, which can be substituted with a variety of different side chains or groups or can include various fused ring configurations, such as including aromatic or heteroaromatic groups. The metal complexes may include two dipyrromethene-based ligands, which can be the same or different. The photoactive compounds can be used as photoactive materials in organic photovoltaic devices, such as visibly transparent or opaque photovoltaic devices.

Abstract: Identifying on-line advertising conversions includes identifying, at a computer server system, a plurality of reports from one or more computing devices, wherein each of the reports indicates a clock skew between one of the computing devices and a clock server system; using the clock skews to determine that two or more of the reports are likely from a common computing device; determining that the two or more of the reports are common, in that they correspond to display of an advertisement on the common computing device and to purchase of on-line content with the common computing device; and indicating that a purchase conversion occurred based on determining that the two or more of the reports are common.

Abstract: Identifying on-line advertising conversions includes identifying, at a computer server system, a plurality of reports from one or more computing devices, wherein each of the reports indicates a clock skew between one of the computing devices and a clock server system; using the clock skews to determine that two or more of the reports are likely from a common computing device; determining that the two or more of the reports are common, in that they correspond to display of an advertisement on the common computing device and to purchase of on-line content with the common computing device; and indicating that a purchase conversion occurred based on determining that the two or more of the reports are common.