General Dynamics

About: General Dynamics is a company organization based out in Fairfax, Virginia, United States. It is known for research contribution in the topics: Signal & Propellant. The organization has 5722 authors who have published 5819 publications receiving 85768 citations. The organization is also known as: GD & General Dynamics Corporation.

Suppressor for electromagnetic interference

Abstract: An electrical connector having means for suppressing electromagnetic interference when the connector pins are separated from the pin sockets. To this end, each of the connector pins or each pin socket is contained in an electrically conductive housing. The housing forms an open space about and extending beyond each pin or socket. This open space forms a waveguide having a predetermined upper cutoff frequency. This cutoff frequency depends on the length of the waveguide measured from the tip of each pin or socket to the end of the waveguide and on the diameter or largest dimension of the waveguide, which may be a cylindrical waveguide. Each of the corresponding pin sockets has an outer insulation tube which fits into the open waveguide. Further, each pin socket is provided with a spring contact for making electrical connection to the respective connector pins. The cutoff frequency of the waveguide is selected to be substantially above the highest frequency of the expected electromagnetic interference.

Properties of the Group VI B Elements under Pressure. II. Semiconductor-to-Metal Transition of Tellurium

Abstract: The electrical resistance of tellurium was measured at pressures to 60 kbar and temperatures to 600\ifmmode^\circ\else\textdegree\fi{}C in a tetrahedral anvil device. A semiquantitative resistance-pressure-temperature phase diagram was determined, showing three solid polymorphs and the liquid phase. The room temperature Te I-II transition pressure was found to be at about 43 kbar. The Te I-II phase boundary has a slope of -30\ifmmode^\circ\else\textdegree\fi{}C/kbar. The triple point for coexistence of Te I, Te II, and liquid Te is at about 29 kbar and 445\ifmmode^\circ\else\textdegree\fi{}C. The semiconductor-to-metal nature of the Te I-II phase change is well established by the isobaric temperature characteristics of the resistance. The magnitude of the resistance change at the Te I-II phase transformation was found to decrease significantly with increasing temperature. At room temperature the resistance of Te I just above the transition is smaller than the atmospheric-pressure resistance of Te by a factor of about ${10}^{3}$. The locus of points defining the pressure dependence of the electronic energy gap ${E}_{g}$ of Te I, determined from the resistance measurements, is convex toward the pressure axis, ${E}_{g}$ decreasing monotonically from 0.33 eV at atmospheric pressure to zero at the Te I-II phase boundary. The slope of this curve is about -0.017 eV/kbar at atmospheric pressure. The experimental data are used with theoretical expressions to calculate the electronic contribution to the thermal conductivity and an upper bound on the thermoelectric figure of merit as a function of pressure. The pressure-induced approach to the metallic state of the Group VI B elements is discussed.

A New Calculation of Resonance Integrals

Abstract: A new method for the calculation of resonance integrals for both homogeneous and heterogeneous assemblies has been developed and programmed for the IBM-7090. It consists in a direct numerical solut...

Augmented proportional navigation in second order predictive scheme

Abstract: A method for augmenting a noise-adaptive predictive proportional navigation terminal guidance scheme. In a third order configuration with noise adaptive varying gain parameters calculated as a function of time-to-go, this system implements an optimal control law to augment proportional navigation with a target acceleration feed forward term and a navigation ratio which is a function of time-to-go and the control effort weighting factor. This third order system may also implement another optimal control law to even greater advantage, taking into account not only target acceleration but also missile acceleration in a feedback loop which, together with the navigation ratio, are both functions of time-to-go and autopilot dynamics, whereby first order autopilot time lag is accounted for. This system is particularly useful for high and medium altitude targets and results in significant miss distance improvement for terminal guidance against small maneuvering targets.