Abstract: A method of mapping an object to a location in a virtual space, the method comprising assigning to locations in the virtual space a prominence value representing the prominence of an object at the location when the virtual space is viewed by a user, the prominence value being assigned according to a distance from each location to a reference location in the virtual space and at least one physiological characteristic of a user, determining a purchase value for the locations in the virtual space representing a payment required to place an object at respective locations in the virtual space, the purchase value being determined at least according to the prominence value assigned to a respective location in the virtual space and in response to receiving the payment for a location in the virtual space, mapping the object to that location in the virtual space.

Abstract: A method comprising: locating an Unmanned Aerial Vehicle (UAV) which is in breach of a predetermined rule; communicating an indication of the breach to the UAV; monitoring the movement of the UAV following the communication of the breach; and in the event of the movement being below a threshold amount after a predetermined time, the method comprises: notifying another device of the movement being below the threshold amount.

Abstract: A method of mapping an object to a location in a virtual space, the method comprising assigning to locations in the virtual space a prominence value representing the prominence of an object at the location when the virtual space is viewed by a user, the prominence value being assigned according to a distance from each location to a reference location in the virtual space and at least one physiological characteristic of a user, determining a purchase value for the locations in the virtual space representing a payment required to place an object at respective locations in the virtual space, the purchase value being determined at least according to the prominence value assigned to a respective location in the virtual space and in response to receiving the payment for a location in the virtual space, mapping the object to that location in the virtual space.

Abstract: A water disinfection system with a flow-through treatment chamber, a plurality of elongated ultraviolet lamps positioned parallel to each other in at least one array within the treatment chamber, and a stand-alone frame which holds in place the lamps of the array and which is constructed so that all lamps of the array can be lifted out of the chamber simultaneously. The array is disposed so that the water must pass through the array. The frame has a cuboid outer shape, an upstream end including front frame members, a downstream end including rear frame members, and a frame center section including side frame members. The array is contained inside the cuboid shape and the frame is positioned in the chamber in an unguided manner and has attachment elements for attaching the frame to a lifting mechanism.

Abstract: A method of mapping an object to a location in a virtual space, the method comprising assigning to locations in the virtual space a prominence value representing the prominence of an object at the location when the virtual space is viewed by a user, the prominence value being assigned according to a distance from each location to a reference location in the virtual space and at least one physiological characteristic of a user, determining a purchase value for the locations in the virtual space representing a payment required to place an object at respective locations in the virtual space, the purchase value being determined at least according to the prominence value assigned to a respective location in the virtual space and in response to receiving the payment for a location in the virtual space, mapping the object to that location in the virtual space.