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Now showing 1 - 10 of 183
  • Publication
    High-Altitude Payload Retrieval (HAPR) Apparatus and Methods of Use
    (The United States of America, as represented by the Secretary of the Navy, Washington, DC (US), 2022-05-17) Yakimenko, Oleg; Research and Sponsored Programs Office (RSPO)
    The disclosure provides an HAPR apparatus comprising an inflatable frame configured to generate canopy extension based on surrounding atmospheric pressure. The inflatable frame has a first collapse load limit less than the weight of the canopy at a first pressurized state less than 75 kPa and a second collapse load limit greater than the weight of the canopy at a second pressurized state of greater than 95 kPa. The internal pressure of the inflatable frame is typically about 101 kPa. The HAPR apparatus allows ascension with the canopy hanging under its own weight to reduce ascension time, then generates canopy extension prior to release in essentially a zero velocity, zero dynamic pressure condition.
  • Publication
    Systems, methods, and apparatuses for determining the distance between two positions
    (The United States of America, as represented by the Secretary of the Navy, Washington, DC (US), 2020-03-10) Romano, Marcello; Restaino, Sergio; Helmboldt, Joseph; Research and Sponsored Programs Office (RSPO)
    Systems, methods, and apparatuses for determining the distance between two positions are disclosed. The system includes a correlator, a first receiver, and a second receiver. The first and second receivers each include: an antenna, a steering mechanism, and a processor. The steering mechanism steers the antenna in an azimuthal direction and an elevation direction. The processor is configured to (i) control the steering mechanism, (ii) receive data recorded by the antenna from a plurality of sources, (iii) time-stamp the data recorded by the antenna, and (iv) control the transmission of the time-stamped data to the correlator. The correlator is configured to receive the time-stamped recorded data from the first receiver and the second receiver, and calculate a distance between the first receiver and the second receiver based thereon.
  • Publication
    System and Method for Unmanned Aerial Vehicle (UAV)-Based Foreign Object Debris (FOD) Detection
    (The United States of America, as represented by the Secretary of the Navy, Washington, DC (US), 2022-03-22) Yakimenko, Oleg A.; Research and Sponsored Programs Office (RSPO)
    A computer-based system and method allows a user to automatically aerially inspect a selected runway/taxiway tarmac surface for foreign object debris (FOD) using a plurality of UAVs equipped with electro - optical (EO) sensors. Live images of the runway surface captured by the EO sensors are transmitted from the UAVs during an inspection sweep of the runway surface and are compared with FOD free reference images of the runway surface to determine whether candidate FOD are detected on the runway surface. Information about and images of candidate FOD are displayed to the user allowing the user to determine whether to send a team to remove the FOD from the runway.
  • Publication
    3D-Printable artificial muscles based on microfluidic microcapacitors
    (The United States of America, as represented by the Secretary of the Navy, Washington, DC (US), 2024-01-23) Kartalov, Emil Paskalev; Coltelli, Michelangelo; Catterlin, Jeffrey; Research and Sponsored Programs Office (RSPO)
    A microcapacitor array for providing artificial muscles is described. The microcapacitor array includes a dielectric body with electrode chambers, positive electrodes in posi­tive electrode chambers, the positive electrodes being con­nected by a first set of channels in the dielectric frame; negative electrodes in negative electrode chambers, the negative electrodes being connected by a second set of channels in the dielectric frame. The first and second set of channels are arranged so that application of a voltage differential between the positive electrodes and the negative electrodes generates an attractive force between each set of adjacent positive and negative electrodes.
  • Publication
    Water submersion detection switch
    (The Government of the United States of America, as represented by the Secretary of the Navy, Washington, DC (US), 2024-04-30) Gamache, Raymond Mark; Office of Research and Innovation
    A water submersion detection system that may include a buoyant device having a conductive surface, and a housing enclosing the buoyant device and having conductive ele­ments. The conductive elements may include a first set of one or more nonadjacent conductive elements that are electrically connected, and a second set of one or more nonadjacent conductive elements that are electrically con­nected. The system may include a submersion alert device that activates responsive to the buoyant device contacting the housing.
  • Publication
    Control and Prognosis of Power Electronic Devices Using Light
    (The United States of America, as represented by the Secretary of the Navy, Washington, DC (US), 2023-04-04) Corzine, Keith; Weatherford, Todd; Porter, Matthew; Research and Sponsored Programs Office (RSPO)
    An optically-monitored and/or optically-controlled electronic device is described. The device includes at least one of a semiconductor transistor or a semiconductor diode. An optical detector is configured to detect light emitted by the at least one of the semiconductor transistor or the semiconductor diode during operation. A signal processor is configured to communicate with the optical detector to receive information regarding the light detected. The signal processor is further configured to provide information concerning at least one of an electrical current flowing in, a temperature of, or a condition of the at least one of the semiconductor transistor or the semiconductor diode during operation.
  • Publication
    Symbol Generation and Frame Synchronization for Multipulse-Pulse Position Modulation
    (The United States of America, as represented by the Secretary of the Navy, Washington, DC (US), 2023-06-20) Koss, Shawn Christian; Tummala, Murali; McEachen, John C.; Research and Sponsored Programs Office (RSPO)
    A method and system for multipulse-pulse position modulation optical transmission that includes selecting a multipulse- pulse position modulation having a symbol alphabet having an upper-bound symbol alphabet size, and determining, based on at least one transmission characteristic associated with a transmitter, a subset of symbols of the selected symbol alphabet capable of being transmitted by the transmitter, the subset of symbols having a set of binary codewords. The method and system may include identifying two-symbol concatenation of binary codewords in the set of binary codewords, calculating a cross correlation of binary codeword in the set of binary code words through every two-symbol concatenation, determining a set of one or more acceptable codeword combinations by eliminating a portion of two-symbol concatenation of codewords corresponding to overlapping peaks in the respective calculated cross correlations, and transmitting, by the transmitter via an optical communication channel, information encoded based on the determined acceptable codeword combinations.
  • Publication
    Fibrous Composite Failure Criteria with Material Degradation for Finite Element Solvers
    (The United States of America, as represented by the Secretary of the Navy, Washington, DC (US), 2023-01-17) Darcy, Joseph; Kwon, Young Wuk; Research and Sponsored Programs Office (RSPO)
    A method and system for modeling fibrous composites. Initially, material properties are obtained for a model of a fibrous composite, where the model includes integration points and unit cells. For each integration point, composite level stresses and strains are determined based on the material properties, the composite level stresses and strains are decomposed into component level stresses and strains for the integration point, the component level stresses and strains are used to calculate failure quotients at the integration point, an appropriate material reduction model is applied at a component level based on the failure quotients to detect a component failure, the component failure is upscaled to determine updated material properties at a composite level, and the updated material properties are incorporated into the model. At this stage, a composite failure is detected based on the updated model.
  • Publication
    Mems Nanotube Based Thermal Neutron Detector
    (The Government of the United States of America, as represented by the Secretary of the Navy, Washington, DC (US), 2024-05-28) Hameed, Zishan; Gats, John; Meyyappan, Meyya; Han, Jin-Woo; Office of Research and Innovation
    A MEMS nanotube based radiation sensor that is low cost, low power, compact, reliable and is applicable across many fields and a method for fabricating such a sensor are described. Each sensor may be connected to an array of similar but distinct sensors that leverage different material sand nanotube technology to detect radiation.
  • Publication
    Microfluidic Microbacterial Fuel Cell Chips and Related Optimization Methods
    (The United States of America, as represented by the Secretary of the Navy, Washington, DC (US), 2023-01-24) Kartalov, Emil Paskalev; Nguyen, Tricia; Arias-Thode; Arias-Thode, Yolanda Meriah; Research and Sponsored Programs Office (RSPO)
    Benthic microbial biofuel cells (BMFCs) are a potential non-toxic and renewable source of underwater power. BMFCs function by coupling an anaerobic anode to an oxygenated cathode. However, current in-situ BMFCs on average produce less than 1W of power. Potential causes are internal ohmic resistance and low capture efficiency of the bacteria-generated charge due to macroscopic average distances between bacteria and electrodes. A microfluidic BMFC chip is enclosed to study those potential causes. The chip is built using elastomer microfluidics to provide biologically-inert microfluidic confinement of the bacteria, forcing them to be no further away than the height of the containment microchamber ( .. 90 μm) from the microelectrode matrix built on the glass substrate of the chip. The matrix captures the charge without location bias (due to its H-architecture) and conducts it to the outside circuit. The microfluidic chip system can be used as an evaluation station to optimize biological parameters, geometry, and electrode scaling towards increased power. That would lead to the development of an optimized power unit that can then be arrayed to build renewable power stations in maritime environments.