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.

Profiling water quality sensing system

Abstract: A system for obtaining a vertical profile of water quality in a body of water is disclosed. The system includes a sensor for sensing predetermined characteristics of water and the depth of water at which the predetermined characteristics are sensed, a cable attached to the sensor for holding the sensor, and a winch assembly attached to the cable for deploying and retrieving the cable and the sensor in a body of water. The winch assembly includes a non-ventilated DC motor coupled to the drum for driving the drum to retrieve the cable, and for generating electricity during deployment of the cable in response to the torque on the motor created by the cable and the sensor during deployment, an electromagnetically released brake coupled to the motor for braking the motor when the brake is not energized, a battery for providing energy for the motor and the brake, and a motor controller coupled to the battery for providing constant voltage excitation of the motor and for controlling the brake. The motor controller includes a circuit which inhibits the motor from operating as a motor during deployment of the cable, and a circuit for reversing the polarity of the motor to cause the motor to generate electricity for recharging the battery during deployment of the cable. A control circuit is coupled to the sensor and to the motor controller for causing the motor controller to brake and stop the motor in response to sensing a predetermined depth of water.

Method of electroless plating employing plasma treatment

Abstract: A method for electroless overplating of a conductive metal on printed wiring circuitry components mounted upon a plastic substrate which eliminates deposit metal overgrowth upon the plastic substrate and plastic bonding materials The substrate and printed wiring are treated by exposure to a tetrafluoromethane plasma environment to chemically passivate, or neutralize, the plastic or adhesive substrate surface areas prior to electroless plating of the printed circuitry elements, thus preventing the establishment of catalyzing ions on the plastic or adhesive surfaces and subsequent lay down of the deposited metal thereon

Acoustical modulator for fiber optic transmission

Abstract: An acoustical sensor utilizing fiber optic transmission including an optical signal generator, a first single-fiber transmission line connected to the generator, and a coupler for receiving signals from the first line and transmitting the signals to a second single fiber which directs the signals to an acoustically sensitive reflective surface. The surface modulates the signal in accordance with acoustical signals applied to it and reflects at least part of the signal back to the fiber where it is transmitted to a third fiber by the coupler and then transmitted to an electronic receiver.

An Analogy for Certain Anisotropic Plates

Abstract: Although the basic differential equations and appropriate boundary conditions for anisotropic plates have been available for many years, exact solutions are unavailable except for the case of infinitely long rectangular plates [1].This note describes an analogy between the differential equations of skew (parallelogram) isotropic plates and rectangular anisotropic plates. Although the analogy is restrictive in applicability, it provides several exact solutions for finite length rectangular anisotropic plates. These solutions are useful by themselves and should prove especially valuable in assessing the accuracy of approximate analyses of anisotropic plates.

Quantum Information Processing Algorithms with Emphasis on Machine Learning

Abstract: Quantum Computing (QC) promises to elevate computing speed by an estimated 100 million times. Several applications, including signal processing, machine learning, big data, communication, and cryptography, will benefit from quantum computing. This paper provides a brief survey of quantum information processing algorithms with an emphasis on machine learning. We begin first, covering with an introduction to quantum systems. Then we describe briefly the fundamental blocks and principles of quantum mechanics, and we present several related QC concepts such as qubits, correlation, and entanglement. We also present simulations and tools for the quantum implementation of select algorithms. We cover specifically Quantum Machine Learning (QML) and demonstrate simple implementations. The paper also describes current research and provides an extensive bibliography for further reading.