Abstract: A system transfers applications and datasets (files) from a server to a client device and assigns to each file a lease key that will expire at a specified time. A file cannot be accessed unless its lease key is validated. Upon expiration of a lease key, the client device will connect to the server to determine if the lease key may be renewed. If the lease key may be renewed, a new lease key is created and access to the associated application or dataset is restored. If the lease key may not be renewed, the file may be deleted or rendered inaccessible. If rendered inaccessible, the file may be restored in the future without having to re-transmit it from the server to the client device. The server may also revoke a lease key before it expires.

Abstract: The disclosure generally relates to a heat exchanger apparatus having first and second heat exchangers arranged in a parallel configuration to receive a first fluid (e.g., a hot fluid) to be subjected to a heat exchange operation (e.g., cooling of the hot fluid). The first and second heat exchangers are further configured in a series configuration with respect to the flow of a second fluid to be used as a heat exchange medium (e.g., a cold fluid to be heated by the first, hot fluid). The heat exchanger apparatus can be used as a radiator (e.g., engine coolant heat exchanger) for a motorized vehicle, in particular a heavy vehicle intended for use in relatively hot ambient environments (e.g., an armored fighting vehicle adapted for desert use at ambient temperatures above about 100° F.). The disclosure also relates to methods of using the heat exchanger apparatus, for example in the motorized vehicle setting.

Abstract: The disclosure generally relates to a heat exchanger apparatus having first and second heat exchangers arranged in a parallel configuration to receive a first fluid (e.g., a hot fluid) to be subjected to a heat exchange operation (e.g., cooling of the hot fluid). The first and second heat exchangers are further configured in a series configuration with respect to the flow of a second fluid to be used as a heat exchange medium (e.g., a cold fluid to be heated by the first, hot fluid). The heat exchanger apparatus can be used as a radiator (e.g., engine coolant heat exchanger) for a motorized vehicle, in particular a heavy vehicle intended for use in relatively hot ambient environments (e.g., an armored fighting vehicle adapted for desert use at ambient temperatures above about 100° F.). The disclosure also relates to methods of using the heat exchanger apparatus, for example in the motorized vehicle setting.