Systems and methods are provided for collecting, aggregating, and analyzing data associated with the performance of systems. In the mobile device, a content request is sent to a server over an IP network, the content request indicative of IP content data of interest to the mobile device. In one embodiment, the predetermined crankshaft angular position corresponds to at least one crankshaft angular position where battery voltage increases during engine cranking. A higher temperature in the test piece than in the reference standard indicates the presence of corrosion. The system likewise uses a model of the human visual system to modify the image to reduce the rocking artifacts. finally, by injecting a contrast dye into a subject harboring a GFP-labeled tumor, angiogenesis in the tumor can be observed directly.