Abstract: A rust-preventive coating comprises two layers of coatings contacted with each other, wherein among the two layers of coatings, a first coating as a coating at an inner layer side is obtained from a first paint composition that contains a first metal-based powder and a first binder component, among the two layers of coatings, a second coating as a coating at an outer layer side is obtained from a second paint composition that contains a second metal-based powder and a second binder component, and compositions are different between the first metal-based powder and the second metal-based powder.

Abstract: A multilayer lubrication coating film is formed on the outer surface of an object to be coated. The multilayer lubrication coating film comprises a lower-layer coating film formed on an outer surface of the object to be coated, and an upper-layer coating film formed on a surface of the lower-layer coating film. The lower-layer coating film has a higher Vickers hardness than the Vickers hardness of the object to be coated.

Abstract: Conventionally, if the number of transmission antennas is greater than that of reception antennas, different signals simultaneously transmitted from the transmission antennas cannot be separated from one another at the receiving end, resulting in a significant degradation of received-signal quality. A transmitter and a receiver each have a plurality of antennas. The transmitter transmits a pilot signal. The receiver receives the pilot signal, calculates transmission-related information corresponding to the pilot signal, selects, based on this calculated information, a transmission signal to be used by the transmitter, and notifies the transmitter of the selected signal. The transmitter selects, from the informed transmission signal, transmission antennas and uses the selected antennas to transmit information signals, so that a signal separation can be easily performed at the receiving end.

Abstract: Conventionally, if the number of transmission antennas is greater than that of reception antennas, different signals simultaneously transmitted from the transmission antennas cannot be separated from one another at the receiving end, resulting in a significant degradation of received-signal quality. A transmitter and a receiver each have a plurality of antennas. The transmitter transmits a pilot signal. The receiver receives the pilot signal, calculates transmission-related information corresponding to the pilot signal, selects, based on this calculated information, a transmission signal to be used by the transmitter, and notifies the transmitter of the selected signal. The transmitter selects, from the informed transmission signal, transmission antennas and uses the selected antennas to transmit information signals, so that a signal separation can be easily performed at the receiving end.

Abstract: A multilayer lubrication coating film is formed on the outer surface of an object to be coated. The multilayer lubrication coating film comprises a lower-layer coating film formed on an outer surface of the object to be coated, and an upper-layer coating film formed on a surface of the lower-layer coating film. The lower-layer coating film has a higher Vickers hardness than the Vickers hardness of the object to be coated.

Abstract: Conventionally, if the number of transmission antennas is greater than that of reception antennas, different signals simultaneously transmitted from the transmission antennas cannot be separated from one another at the receiving end, resulting in a significant degradation of received-signal quality. A transmitter and a receiver each have a plurality of antennas. The transmitter transmits a pilot signal. The receiver receives the pilot signal, calculates transmission-related information corresponding to the pilot signal, selects, based on this calculated information, a transmission signal to be used by the transmitter, and notifies the transmitter of the selected signal. The transmitter selects, from the informed transmission signal, transmission antennas and uses the selected antennas to transmit information signals, so that a signal separation can be easily performed at the receiving end.

Abstract: A coated metal product is disclosed in which the surface of a ferrous component is coated using an anticorrosive layer, and the surface of the anticorrosive layer is coated using a coating film. The coating film has numerous very small uncoated portions for exposing the surface of the anticorrosive layer to the exterior of the coated metal product, rather than the entire surface of the anticorrosive layer being coated.

Abstract: Conventionally, if the number of transmission antennas is greater than that of reception antennas, different signals simultaneously transmitted from the transmission antennas cannot be separated from one another at the receiving end, resulting in a significant degradation of received-signal quality. A transmitter and a receiver each have a plurality of antennas. The transmitter transmits a pilot signal. The receiver receives the pilot signal to calculate transmission-related information corresponding to the pilot signal, and then selects, based on this calculated information, a signal to be sent to and utilized by the transmitter. The receiver then informs the selected signal to the transmitter. The transmitter selects, from the informed signal, transmission antennas and uses them to transmit information signals, so that a signal separation can be easily performed at the receiving end.