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公开(公告)号：US11383486B2
公开(公告)日：2022-07-12
申请号：US16531858
申请日：2019-08-05
发明人： Yaning Li
摘要： The present invention is directed at materials and methods for their formation having wavy network structures dispersed in a second and relatively harder phase. The materials can be designed to exhibit auxetic properties (e.g. a negative Poisson's ratio) in response to an application of force.
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公开(公告)号：US20220060683A1
公开(公告)日：2022-02-24
申请号：US17518105
申请日：2021-11-03
发明人： Yuri Rzhanov
摘要： A system and method for colorimetric calibration is described herein. A system for performing color calibration is described, comprising at least one broad spectrum light emitting diode, at least one light diffuser plate, at least one interference filter, and a camera, the camera comprising at least one sensor for detection of colors, wherein a spectral response within 5% error of a ground truth method can be achieved. A method for performing color calibration is described, comprising transmitting light from at least one broad spectrum light emitting diode, scattering light with at least one light diffuser plate, filtering light with at least one interference filter, detecting light at a camera sensor, mapping an intensity value for each pixel of the camera sensor, and creating a quantum efficiency curve for each of red, green, and blue channels.
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公开(公告)号：US11257509B2
公开(公告)日：2022-02-22
申请号：US16198255
申请日：2018-11-21
IPC分类号： G10L21/0232 , G06F17/14 , G10L15/20 , G10L21/0216 , G06N7/00 , G10L21/0264
摘要： Techniques for EMD-based signal de-noising are disclosed that use statistical characteristics of IMFs to identify information-carrying IMFs for the purposes of partially reconstructing the identified relevant IMFs into a de-noised signal. The present disclosure has identified that the statistical characteristics of IMFs with noise tend to follow a generalized Gaussian distribution (GGD) versus only a Gaussian or Laplace distribution. Accordingly, a framework for relevant IMF selection is disclosed that includes, in part, performing a null hypothesis test against a distribution of each IMF derived from the use of a generalized probability density function (PDF). IMFs that contribute more noise than signal may thus be identified through the null hypothesis test. Conversely, the aspects and embodiments disclosed herein enable the determination of which IMFs have a contribution of more signal than noise. Thus, a signal may be partially reconstructed based on the predominately information-carrying IMFs to result in de-noised output signal.
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公开(公告)号：US20210364289A1
公开(公告)日：2021-11-25
申请号：US17391776
申请日：2021-08-02
发明人： Yuri Rzhanov
摘要： An apparatus and method are presented comprising one or more sensors or cameras configured to rotate about a central motor. In some examples, the motor is configured to travel at a constant linear speed while the one or more cameras face downward and collect a set of images in a predetermined region of interest. The apparatus and method are configured for image acquisition with non-sequential image overlap. The apparatus and method are configured to eliminate gaps in image detection for fault-proof collection of imagery for an underwater survey. In some examples, long baseline (LBL) is utilized for mapping detected images to a location. In some examples, ultra-short baseline (USBL) is utilized for mapping detected images to a location. The apparatus and method are configured to utilize a simultaneous localization and mapping (SLAM) approach.
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公开(公告)号：US20210213427A1
公开(公告)日：2021-07-15
申请号：US17214161
申请日：2021-03-26
发明人： David S. Lashmore , Tyler Bennett
IPC分类号： B01J23/745 , C01B21/064 , C01B32/162 , B01J37/02 , B01J35/02 , C23C16/26 , B01J37/16 , B01J35/00
摘要： Techniques and methods are disclosed for producing a plurality of nanoparticles that can be used as catalysts to grow carbon or boron nitride nanotubes. The method includes mixing an iron salt including a ferrous or ferric ion with a long chain amine, thiol or polyphenol in a solvent comprising alcohol to produce a solution. Ferric or ferrous ion is reduced to zero valence iron. Nucleation of iron nanoparticles is initialized. The iron nanoparticles are capped to retard nanoparticle growth. The nanoparticles include an elemental iron core coated with a polyphenol that isolates the core from oxygen. The nanoparticles include an average diameter of less than or equal to 15.8 nanometers. The iron core may further include a secondary metal to form an iron-alloy. The secondary metal, in some applications, can be a transition metal.
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公开(公告)号：US20210143545A1
公开(公告)日：2021-05-13
申请号：US17155074
申请日：2021-01-21
发明人： Rudra Timsina , Richard Messner
摘要： This disclosure is generally directed to a microstrip phased array antenna with a switch line phase shifter to obtain steerable beam pattern. In an embodiment, the microstrip phased array antenna includes a plurality microstrip lines disposed/patterned on a substrate to form a relatively compact phase shifter network that can switchably introduce phase shifts into an RF signal. In particular, each phase shifter of the phase shifter network may be formed from a number of equal-length RF lines that extend from a common point and “loop” to form substantially circular paths. The common point from which each of the RF lines extend may include a VIA to couple to an antenna device. A plurality of switches, e.g., PIN diodes, may be disposed along the RF lines to switchably extend the overall length of each of the phase shifters, and more particularly each transmission line, to selectively introduce a target phase shift.
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公开(公告)号：US10720542B2
公开(公告)日：2020-07-21
申请号：US15970114
申请日：2018-05-03
发明人： David S. Lashmore
IPC分类号： H01L31/036 , H01L31/0687 , C01B35/14 , H01L31/032 , H01L31/0352 , H01L31/048 , B82Y30/00
摘要： Solar cells fabricated from p-n junctions of boron nitride nanotubes alloyed with carbon are described. Band gaps of boron nitride carbon alloys are tailored by controlling carbon content in the boron nitride nanotubes. High efficiency solar cells can be fabricated by tailoring the band gap of boron nitride carbon alloy nanotubes, and using these nanotubes for fabricating solar cells u. Because boron nitride carbon alloy nanotubes are transparent to most wavelengths of light, the wavelengths not converted to electrons (i.e., absorbed) at a first p-n junction in a solar cell will pass through the stack to another p-n junction in the stack having a different band gap. At each successive p-n junction, each of which has a different band gap from the other p-n junctions in the stack, more wavelengths of light will be converted into electricity. This dramatically increases the efficiency of solar cells.
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公开(公告)号：US10380755B2
公开(公告)日：2019-08-13
申请号：US15819490
申请日：2017-11-21
摘要： A technique for estimating a whole object surface area and volume of a micro-scale three-dimensional model with a partially visible surface includes receiving a single-view stereoscopic image of an object of interest and an unconstrained three-dimensional point cloud of the object, generating a constrained three-dimensional point cloud using the image, the unconstrained three-dimensional point cloud, and a digital elevation model (DEM) of the object generated from the image, generating, using the constrained three-dimensional point cloud, a three-dimensional mesh representing an estimate of the surface of the object, calculating a partial surface area and/or partial volume of the object using the three-dimensional mesh, estimating an extent of a visible surface of the object, and calculating a whole surface area and/or a whole volume of the object based on the partial surface area of the object and the estimated extent of the visible surface of the object.
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公开(公告)号：US10348057B2
公开(公告)日：2019-07-09
申请号：US15875270
申请日：2018-01-19
发明人： William Hersman , Michael Hersman
摘要： A high power diode laser system selects the central wavelength and narrows the spectral bandwidth by employing one or more atomic line filters (ALFs) as the wavelength selective element in the external cavity to optimize high power multi-mode operation. The high power diode laser system may include multiple diode laser sources, such as multiple diode laser bar stacks, providing multiple output beams. In an “in-line” or “straight through” configuration, a partially reflective surface terminates the external cavity to feed beam power back through the external cavity and to provide one or more output beams. In a “splitter” or “power divider” configuration, a highly reflective surface terminates the external cavity and one or more beam splitters between the diode laser source(s) and the ALF are used to provide one or more output beams. An afocal telescope may be used to image the diode laser source(s) at the reflective surface terminating the external cavity.
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公开(公告)号：US20190157760A1
公开(公告)日：2019-05-23
申请号：US16194866
申请日：2018-11-19
发明人： Rudra TIMSINA , Richard MESSNER
摘要： This disclosure is generally directed to a microstrip phased array antenna with a switch line phase shifter to obtain steerable beam pattern. In an embodiment, the microstrip phased array antenna includes a plurality microstrip lines disposed/patterned on a substrate to form a relatively compact phase shifter network that can switchably introduce phase shifts into an RF signal. In particular, each phase shifter of the phase shifter network may be formed from a number of equal-length RF lines that extend from a common point and “loop” to form substantially circular paths. The common point from which each of the RF lines extend may include a VIA to couple to an antenna device. A plurality of switches, e.g., PIN diodes, may be disposed along the RF lines to switchably extend the overall length of each of the phase shifters, and more particularly each transmission line, to selectively introduce a target phase shift.
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