Abstract: An object is to detect an insulation failure of a DC circuit with high sensitivity and in safety by means of a simple detection circuit. An insulation resistance measurement device of this invention is a device for measuring an insulation resistance to ground of a DC source circuit and is provided with connection terminals for connections to a positive electrode and a negative electrode of a series power supply, switch elements connected between the connection terminals and the ground potential and configured to switch connections between the connection terminals and the ground potential, resistive elements connected through the switch elements between the connection terminals respectively, and the ground potential, and a voltage detection unit for detecting voltage drops in the resistive elements.

Abstract: This ship 10 is a ship for transporting cargos such as containers, and it is possible to efficiently perform the cargo handling operation for cargos. A lower hold 16 is provided below a deck 15 in a hull 14. The deck 15 is provided with protruding portions 17 and 18 protruding in the right and left side directions of the hull, and a plurality of frameworks 21 each including vertical pillars 22 and 23 fixed to the respective protruding portions 17 and 18 and a horizontal beam 24 through which the vertical pillars 17 and 18 are connected to each other are provided for the deck 15. Openable partition covers 25 are provided between frameworks adjacent to each other, and an upper hold 26 is formed on the deck 15 by the partition covers 25 and the deck 15. The cargo handling operation for the lower hold 16 is performed by an inboard crane 33 provided in the lower hold 16, and at the same time, the cargo handling operation for the upper hold 26 is performed by a quay crane 37.

Abstract: An object is to detect an insulation failure of a DC circuit with high sensitivity and in safety by means of a simple detection circuit. An insulation resistance measurement device of this invention is a device for measuring an insulation resistance to ground of a DC source circuit and is provided with connection terminals for connections to a positive electrode and a negative electrode of a series power supply, switch elements connected between the connection terminals and the ground potential and configured to switch connections between the connection terminals and the ground potential, resistive elements connected through the switch elements between the connection terminals, respectively, and the ground potential, and a voltage detection unit for detecting voltage drops in the resistive elements.

Abstract: This ship 10 is a ship for transporting cargos such as containers, and it is possible to efficiently perform the cargo handling operation for cargos. A lower hold 16 is provided below a deck 15 in a hull 14. The deck 15 is provided with protruding portions 17 and 18 protruding in the right and left side directions of the hull, and a plurality of frameworks 21 each including vertical pillars 22 and 23 fixed to the respective protruding portions 17 and 18 and a horizontal beam 24 through which the vertical pillars 17 and 18 are connected to each other are provided for the deck 15. Openable partition covers 25 are provided between frameworks adjacent to each other, and an upper hold 26 is formed on the deck 15 by the partition covers 25 and the deck 15. The cargo handling operation for the lower hold 16 is performed by an inboard crane 33 provided in the lower hold 16, and at the same time, the cargo handling operation for the upper hold 26 is performed by a quay crane 37.