公开(公告)号：US20230279525A9

公开(公告)日：2023-09-07

申请号：US17886949

申请日：2022-08-12

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： John J. PITTARI, III ,  Steven M. Kilczewski ,  Jeffrey J. Swab ,  Kristopher A. Darling ,  Billy C. Hornbuckle ,  Heather A. Murdoch ,  Robert J. Dowding

IPC: C22C29/02 ,  B22F3/105 ,  C22C29/08 ,  B22F3/14 ,  C22C29/06 ,  C22C1/051

CPC classification number: C22C29/02 ,  B22F3/105 ,  C22C29/08 ,  B22F3/14 ,  C22C29/067 ,  C22C1/051

Abstract: A sintered cemented carbide body including tungsten carbide, and a substantially cobalt-free binder including an iron-based alloy sintered with the tungsten carbide. The iron-based alloy is approximately 2-25% of the overall weight percentage of the sintered tungsten carbide and iron-based alloy. The tungsten carbide may be approximately 90 wt % and the iron-based alloy may be approximately 10 wt % of the overall weight percentage of the sintered tungsten carbide and iron-based alloy. The tungsten carbide may comprise a substantially same size before and after undergoing sintering. The iron-based alloy may be sintered with the tungsten carbide using a uniaxial hot pressing process, a spark plasma sintering process, or a pressureless sintering process. The sintered tungsten carbide and iron-based alloy has a hardness value of at least 15 GPa and a fracture toughness value of at least 11 MPa√m.

公开(公告)号：US11262172B2

公开(公告)日：2022-03-01

申请号：US15846244

申请日：2017-12-19

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Gregory S. Mannix

IPC: F42B39/24 ,  F41H5/04 ,  F41H5/02 ,  F42B39/14

Abstract: An ammunition storage compartment includes a plurality of connected walls defining an interior region to store ammunition, wherein at least one of the walls includes an outer armor plate having an outer surface and an inner surface. A layer of energy absorbing material is located proximate the inner surface of the armor plate in the interior region. A spall mitigating panel is located inward of the layer of energy absorbing material in the interior region. At least one air gap is in between the layer of energy absorbing material and the spall mitigating panel.

公开(公告)号：US11229253B2

公开(公告)日：2022-01-25

申请号：US16295101

申请日：2019-03-07

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Eric D. Wetzel ,  Devon J. Spinelli ,  Thomas A. J. Plaisted

IPC: A42B3/14 ,  A42B3/12 ,  A42B3/06 ,  F16F13/08 ,  A63B71/10

Abstract: Impact energy absorbing devices, in some embodiments, may be configured as a helmet having suspension elements employing “rate activated tethers” (RATs), a speed-sensitive flexible strapping material. The RATs are configured to suspend a helmet shell on the head of a wearer, so that impact to the helmet causes extension of the RATs. The RATs provide for: (1) steady force over long strokes, and (2) a stroke force that increases with increasing impact velocity. Standard impact testing of a helmeted headform shows that the RAT suspension decreases head accelerations by 50% relative to a standard suspension system. This decrease in head acceleration is expected to lead to a reduced likelihood of brain and head injury. Because the RATs absorb energy during tensile extension, they offer increases in energy absorption efficiency. These RAT suspensions can potentially replace or complement existing helmet pad and suspension systems in military, sports, and industrial safety-wear.

公开(公告)号：US11145884B2

公开(公告)日：2021-10-12

申请号：US16281137

申请日：2019-02-21

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Rongzhong Jiang ,  Dat Tien Tran ,  Deryn D. Chu

IPC: H01M8/0656 ,  H01M8/1011

Abstract: Methods and apparatus for generating electric power from a fuel cell are disclosed. In embodiments, a fuel cell for generating electric power includes: a first electrochemical cell including a first electrode and second electrode, wherein the first electrochemical cell is configured to generate a first stage electric power (P1) from a fuel source; and a bi-cell including a second electrochemical cell and third electrochemical cell, wherein the second electrochemical cell includes a third electrode in fluid communication with the fuel source, and a fourth electrode, wherein the second electrochemical cell is configured to generate hydrogen gas from the fuel source and transport the hydrogen gas to a third electrochemical cell, and wherein the third electrochemical cell includes the fourth electrode, and a fifth electrode in fluid communication with a second air source, wherein the fourth electrode is configured for use by the second electrochemical cell as a cathode for hydrogen generation, and by the third electrochemical cell as an anode for hydrogen oxidation, and wherein the third electrochemical cell is configured to generate a second stage electric power (P2).

公开(公告)号：US20210189605A1

公开(公告)日：2021-06-24

申请号：US17182678

申请日：2021-02-23

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Eric D. Wetzel ,  Larry R. Holmes, JR. ,  Ricardo X. Rodriguez ,  Patrick M. Toal, JR.

IPC: D01F8/14 ,  B29C64/106 ,  B29C55/00 ,  B29C35/02 ,  D01F8/10 ,  D01F8/18 ,  D01F8/00 ,  B33Y70/00 ,  D01D5/30 ,  D01D5/24 ,  B29C64/118 ,  B29C65/00 ,  B29D11/00 ,  B29C65/56

Abstract: A thermoplastic filament comprising multiple polymers of differing flow temperatures in a geometric arrangement and an interior channel containing a structural or functional thread therein is described. A method for producing such a filament is also described. Because of the difference in flow temperatures, there exists a temperature range at which one polymer is mechanically stable while the other is flowable. This property is extremely useful for creating thermoplastic monofilament feedstock for three-dimensionally printed parts, wherein the mechanically stable polymer enables geometric stability while the flowable polymer can fill gaps and provide strong bonding and homogenization between deposited material lines and layers. These multimaterial filaments can be produced via thermal drawing from a thermoplastic preform, which itself can be three-dimensionally printed. Furthermore, the preform can be printed with precisely controlled and complex geometries, enabling the creation of a filament or fiber with an interior thread contained within the outer, printed filament or fiber. This thread adds structural reinforcement or functional properties, such as electrical conductivity or optical waveguiding, to the filament.

公开(公告)号：US10590241B2

公开(公告)日：2020-03-17

申请号：US15434391

申请日：2017-02-16

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Eric D. Wetzel ,  Emil Jose Sandoz-Rosado ,  Todd David Beaudet ,  Radhakrishnan Balu ,  John Joseph La Scala ,  Dominika Nini Lastovickova

IPC: C08G73/10 ,  C08G73/18 ,  C08G73/22 ,  C08G63/00 ,  C08G63/78 ,  C08G63/133 ,  F41H5/08 ,  C08G75/32 ,  C08G63/127 ,  C08G69/32 ,  C08G73/02 ,  C08G63/06

Abstract: A family of new and novel molecules for mechanically superior two-dimensional (2D) polymers is described herein. By combining stiff carbon-containing cyclic polymer nodal units with more compliant linear polymer bridge units in an ordered, 2D repeating molecular structure it is possible to tailor the mechanical properties of 2D polymers and their assemblies to provide high stiffness, strength, and toughness. Furthermore, the inherent dimensionality of 2D polymers and their ability to be stacked into ordered and chemically interactive ensembles gives them inherent benefits in a variety of barrier and structural applications over current stiff and strong linear polymer technologies.

公开(公告)号：US10564257B2

公开(公告)日：2020-02-18

申请号：US15422553

申请日：2017-02-02

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Anthony F. Martone ,  Kenneth I. Ranney ,  Kelly D. Sherbondy

IPC: G01S7/40 ,  G01S7/02 ,  G01S13/00

Abstract: A spectrum sensing radar system including a spectrum power sensing module configured to sense electromagnetic signal powers in a plurality of sub-frequencies and generate a sensed power set including a plurality of sensed electromagnetic signal powers corresponding to each of the plurality of sub-frequencies; a multi-objective function module configured to receive the sensed power set and calculate a first objective function for each of the plurality of sub-frequencies, wherein the first objective function includes a power function divided by an empirical measure of interference of the sensed power set to form a signal plus noise objective function for a sub-frequency of the plurality of sub-frequencies, and wherein the power function further includes a peak transmit power of the radar system multiplied by a gain of an antenna of the radar system, multiplied by a wavelength of a carrier of the sub-frequency.

公开(公告)号：US10551427B2

公开(公告)日：2020-02-04

申请号：US15431941

申请日：2017-02-14

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： William A. Beck

IPC: G01R31/26 ,  G01R33/12 ,  G01R33/07

Abstract: A method for determining a two-dimensional spectrum of a specified carrier having a specified mobility and density in a material of an electronic device, the method including performing a magnetic field-dependent Hall measurement on the material of the electronic device; determining, using the magnetic field-dependent Hall measurement, a probability density function of a conductance of the material of the electronic device, wherein the probability density function describes a spectrum of a plurality of m-carriers, wherein the plurality of m-carriers includes the specified carrier having the specified mobility and density; and determining an electrical transport of a plurality of electrons and holes inside the material of the electronic device by observing a variation of the probability density function with any of the specified mobility and density of the specified carrier.

公开(公告)号：US10414060B2

公开(公告)日：2019-09-17

申请号：US14831585

申请日：2015-08-20

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： M. Gail Koebke

IPC: B26D1/04 ,  B26D1/01 ,  B26D7/00 ,  B26F1/44

Abstract: A cutter to cut die attach solder preform material is disclosed. It is formed of: a base; a pair of raised blocks spaced apart on the base with each having a slot sized to accommodate a cutting blade configured to cleave the material to be cut, constrain the cutting blade to vertical movement, and maintain the squareness of the cutting blade with respect to the base for cutting material; an adjustable stop positioned forward of the cutting blade which is configured to be moved so as to set the length of the material to be cut by the cutting blade; and a linear scale positioned proximate to the adjustable stop which enables a measured length of the material to be cut. Methods of using the aforementioned cutter are also disclosed.

公开(公告)号：US10193637B2

公开(公告)日：2019-01-29

申请号：US15000556

申请日：2016-01-19

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Robert J. Drost ,  Michael Brodsky

IPC: H04B10/70

Abstract: A method for determining a network configuration for the delivery of entangled photons individually to a plurality of users, the network comprising a plurality of inputs, switches, and outputs operatively connected by optical fibers; the plurality of switches being switchable between two states; the method comprising: determining the minimum number of switches necessary to deliver entangled photon pairs from a predetermined number of sources to a predetermined number of users, minimizing the loss experienced by an entangled photon passing through the switches by minimizing the number of switches that any one photon passes through by selecting only nondominated switch configurations; determining the minimum number of equivalent network switch configurations and eliminating all but one of the equivalent network switch configurations; and selecting an optimum network configuration by which the plurality of inputs and the plurality of outputs are operatively interconnected using a minimum number of switches in any one route.