Abstract: According to one embodiment, the video camera includes an operation unit which performs a variety of input operations, a video shooting unit which performs video shooting, a recording unit which records video data obtained from the video shooting unit in a hard disk, and a GPS processing unit which determines a date and time. The video camera further includes an event information processing unit which creates typical event data including a variety of events by using a birthday input from the operation unit as a starting point and registers the typical event data in a database, selects events for at least the date and time of video shooting, as event candidates, from the typical event data registered in the database, forecast the most appropriate candidate by narrowing down the event candidates, and records the most appropriate candidate in the hard disk as an event associated with the video data.

Abstract: A method of determining a concentration of magnetic powderly material in a sample is disclosed. In this method, a pair of series-connected exciting coils are disposed in such a manner that magnetic fields generated from the respective exciting coils oppose to each other. A detecting coil is disposed at a position where the magnetic fields from the pair of exciting coils cancel out each other. A sample mixed with magnetic powder is inserted into one of the pair of exciting coils. Then, the method detects a voltage induced in the detecting coil in association with the insertion of the sample into the exciting coil and determines the concentration of the magnetic powder in the sample based on the detected voltage.