Abstract: A drone port is portable to be disposed on a landing surface for a drone and includes a covering section configured to cover the landing surface and provided with markers of different sizes. The covering section includes a restraining section configured to restrain the drone on the covering section. The restraining section includes a first hook-and-loop fastener disposed on the covering section. The first hook-and-loop fastener is configured to join with a second hook-and-loop fastener configured to be disposed on the drone.

Abstract: This copper alloy has a composition containing Mg in an amount of 0.10 mass % or greater and 2.6 mass % or less, with a balance being Cu and inevitable impurities, in which in a plastic deformation region of a stress-strain curve obtained in a low-speed tensile test at a strain rate of 1.0×10?6/s, an average value of a period of a strain of a saw edge-shaped curve is 0.01% or greater and 1.0% or less, an average value of a difference in level of stress of the saw edge-shaped curve is 0.1 MPa or greater and 2 MPa or less, and there are five or more saw edge-shaped curves with a period of strain of 0.01% or greater and 1.0% or less and a difference in the level of stress of 0.1 MPa or greater and 2 MPa or less.

Abstract: This copper alloy contains greater than 10 mass ppm and less than 100 mass ppm of Mg, with a balance being Cu and inevitable impurities, which comprise: 10 mass ppm or less of S, 10 mass ppm or less of P, 5 mass ppm or less of Se, 5 mass ppm or less of Te, 5 mass ppm or less of Sb, 5 mass ppm or less of Bi, and 5 mass ppm or less of As. The total amount of S, P, Se, Te, Sb, Bi, and As is 30 mass ppm or less. The mass ratio [Mg]/[S+P+Se+Te+Sb+Bi+As] is 0.6 to 50, an electrical conductivity is 97% IACS or greater. The half-softening temperature ratio TLD/TTD is greater than 0.95 and less than 1.08. The half-softening temperature TLD is 210° C. or higher.

Abstract: A portable drone port that is portable and disposed on a landing surface for a drone includes a covering section configured to cover the landing surface and provided with markers of different sizes. The covering section includes a restraining section configured to restrain, on the covering section, the drone that lands on the covering section. The restraining section is hook-and-loop fasteners including a hook-and-loop fastener on one side disposed on the covering section and a hook-and-loop fastener on the other side disposed on the drone and configured to join to the hook-and-loop fastener on the one side.

Abstract: To provide an unmanned aerial vehicle that eliminates or minimizes the laboriousness involved in optimal pitch adjustment of propellers while eliminating or minimizing complexity and instability in airframe structure and/or flight programs. This object is solved by an unmanned aerial vehicle that is provided with a plurality of rotors and that includes: a center frame that is a central portion of an airframe of the unmanned aerial vehicle; and a plurality of arms extending radially from the center frame in plan view. A plurality of motors that are driving sources of the respective rotors are provided in the center frame. The plurality of rotors are supported by the respective arms. Each arm of the arms has a hollow cylindrical structure. A motive power transmission member configured to transmit a driving force of each motor of the motors to the each rotor is provided in the each arm.

Abstract: To provide an unmanned aerial vehicle that eliminates or minimizes the laboriousness involved in optimal pitch adjustment of propellers while eliminating or minimizing complexity and instability in airframe structure and/or flight programs. This object is solved by an unmanned aerial vehicle that is provided with a plurality of rotors and that includes: a center frame that is a central portion of an airframe of the unmanned aerial vehicle; and a plurality of arms extending radially from the center frame in plan view. A plurality of motors that are driving sources of the respective rotors are provided in the center frame. The plurality of rotors are supported by the respective arms. Each arm of the arms has a hollow cylindrical structure. A motive power transmission member configured to transmit a driving force of each motor of the motors to the each rotor is provided in the each arm.

Abstract: A memory unit having a plurality of heads performing at least one of recording or reproducing operations on a storage medium is disclosed. The memory unit includes a first converter circuit for receiving head-selection signals as first parallel data and converting the head-selection signals to first serial data to be transmitted, and a second converter circuit for receiving the first serial data from the first converter circuit and converting the first serial data to second parallel data to be transmitted. The memory unit further includes a head control circuit for receiving the second parallel data from the second converter circuit and selectively driving the heads on the basis of the second parallel data.

Abstract: A memory unit having a plurality of heads performing at least one of recording or reproducing operations on a storage medium is disclosed. The memory unit includes a first converter circuit for receiving head-selection signals as first parallel data and converting the head-selection signals to first serial data to be transmitted, and a second converter circuit for receiving the first serial data from the first converter circuit and converting the first serial data to second parallel data to be transmitted. The memory unit further includes a head control circuit for receiving the second parallel data from the second converter circuit and selectively driving the heads on the basis of the second parallel data.

Abstract: A method and disk apparatus, for writing data disk apparatus, that reduces the adverse influence of noise caused by data head writing on a read signal of a servo head even though the data head and the servo head are collaterally paired with no disks there between. A magnetic disk apparatus comprises a plurality of magnetic disks that are stacked at predetermined intervals; a servo head for reading servo signals recorded on a servo surface of one of the magnetic disks; a plurality of data heads, one of which is provided for each data surface of the magnetic disks with a first data head being collaterally positioned with the servo head, with no intervening magnetic disk, and second data heads being positioned at other than the collateral position; and an actuator for supporting the servo head and the data heads and for positioning the servo head and the data heads by moving them radially relative to the magnetic disks.