General Dynamics Corporation is an American aerospace and defense company formed by mergers and divestitures. It is the world's fifth-largest defense contractor based on 2012 revenues. General Dynamics is headquartered in West Falls Church, Fairfax County, Virginia.The company has changed markedly in the post-Cold War era of defense consolidation. It has four main business segments: Marine Systems; Combat Systems; Information Systems and Technology; and Aerospace. Until 1993, when production was sold to Lockheed, General Dynamics' former Fort Worth Division manufactured the Western world's most-produced jet fighter, the F-16 Fighting Falcon. In 1999, the company re-entered the airframe business with its purchase of Gulfstream Aerospace. Wikipedia.
Akdim B.,Air Force Research Lab |
Akdim B.,General Dynamics Corporation |
Pachter R.,Air Force Research Lab
ACS Nano | Year: 2011
Recently, several experiments demonstrated the stability of chain-like carbon nanowires bridged between graphene nanoribbons, paving the way for potential applications in nanodevices. On the basis of density functional tight-binding calculations, we demonstrated switching for chains terminated with a five-membered ring under an applied strain, serving as a model for morphological changes in realistic materials. Electron transport calculations showed an increase of up to 100% in the output current, achieved at a reverse bias voltage of -2 V and an applied strain of just 1.5%. Structural analysis suggested that the switching is driven by conformational changes, where in our case is triggered by the formation and annihilation of a five-membered ring at the interface of the chain-graphene edge. In addition, we showed that a five-membered ring can easily be formed at the interface under a source-drain bias or through a gate voltage. This mechanism can serve as an explanation of experimentally observed conductance for the materials. © 2011 American Chemical Society.
General Dynamics Corporation | Date: 2015-08-04
A floatable land vehicle is provided that includes a base body having at least one buoyancy body that is detachably fastened to the base body, the buoyancy body containing an at least partially filled tank.
General Dynamics Corporation | Date: 2014-01-28
A method of manufacturing a multi-layered propellant grain is provided. The method of the present disclosure simplifies the setup necessary to produce multi-layered propellants by using industrial equipment that is more energy and space efficient than the machinery that is conventionally employed for such processes. The method comprises providing a first propellant formulation; providing a die configured to provide a structure having an outer shell and a hollow interior when material is extruded therethrough; extruding the first propellant formulation through said die, to produce a first propellant layer having an outer shell defining a hollow interior in the form channel having open ends; providing a second propellant formulation, said second propellant formulation being of low viscosity; injecting said second propellant formulation into said channel defined by said first propellant layer to form a second propellant layer disposed in said channel; and hardening said second propellant layer. The first and second propellant layers have different rates of burning.
General Dynamics Corporation | Date: 2014-09-16
A network element for controlling a usage of at least one resource is described. The network element comprises: a transmitter for transmitting a signal identifying at least one uplink resource to at least one wireless communication unit; a signal processor operably coupled to the transmitter for generating the signal; and a receiver for receiving a transmission from the at least one wireless communication unit on the identified at least one uplink resource. The signal processor is arranged to allocate the uplink resource for the at least one wireless communication unit in a first portion of a first sub-frame on a first frequency and a first portion of a second sub-frame on a second frequency wherein a time gap is allocated between an end of the first portion of the first sub-frame and a beginning of the first portion of a second sub-frame.
General Dynamics Corporation | Date: 2014-03-14
Systems and methods are provided for advanced persistent threat detection on a network. The method includes capturing data packets from a network and performing layered session decoding on the captured packets. Metadata is extracted from the decoded packets and is stored for analysis. Analysis of the metadata is used to detect advanced persistent threats on the network. The system includes a network and a processor coupled to the network. The processor is configured to capture data packets from the network and perform layered session decoding on the captured packets. Metadata is extracted by the processor and stored in a memory coupled to the processor. The metadata may then be analyzed to detect advanced persistent threats on the network.