Abstract: Examples of the present disclosure include a method. The method includes coating a surface with a resin. The resin includes an organic material. The method includes depositing a nanoparticle of a plurality of nanoparticles into each cavity of a plurality of cavities of a lattice. The method includes placing the lattice onto the surface such that the plurality of cavities of the lattice face the surface. The method includes curing the resin to the lattice. The method includes removing the lattice from the surface. The method includes transferring the plurality of nanoparticles from the plurality of cavities to a side of a body of a contact lens by placing the lattice onto the body of the contact lens such that the plurality of cavities face the side. The method includes removing the lattice from the body of the contact lens.

Abstract: In various example embodiments, a system and method for tracking objects in a three-dimensional space is disclosed. One method includes receiving detections representing targets, increasing a classification of a track in response to a detection matching the track, decreasing a classification of a track in response to no detections matching the track, and processing detections according to a classification level of the track.

Abstract: For trapping atoms, an x-axis wire carries an x-axis current I0cos ?t, wherein I0 is current amplitude, ? is a trap field frequency, and t is time. A y-axis wire carries a y-axis current I0sin ?t, the y-axis wire intersecting the x-axis wire at a cross center. A ?-field coil generates a transverse magnetic bias field ? rotating about the cross center and perpendicular to a z axis. A ?-field coil generates a longitudinal magnetic bias field ? rotating about the cross center and perpendicular to the z axis. The x-axis wire, the y-axis wire, the transverse magnetic bias field ?, and the longitudinal magnetic bias field ? form a time-averaged trap along the z axis near the cross center.

Abstract: For model predictive control for a spacecraft formation, a method calculates a virtual point that represents a plurality of spacecraft orbiting in a spacecraft formation. The method calculates an outer polytope boundary and an inner polytope boundary relative to the virtual point for a given spacecraft of the plurality of spacecraft. The method maneuvers the given spacecraft to within the inner polytope boundary using model predictive control (MPC) to minimize fuel consumption.

Abstract: An expanding dowel-pin comprises an upper-collet, inside-conical bore with one or more upper-collet slits. The expanding dowel pin further includes a double-tapered cylinder with tapered cones tapering more narrowly from its middle. The expanding dowel pin further includes a lower collet with a lower-collet, inside-conical bore which has one or more lower-collet slits. The lower collet further includes a lower-collet, inside-straight bore with lower-collet internal screw threads. The upper collet, the double-tapered cylinder, and the lower collet are, in that order, configured to have a bolt pass therethrough. The lower-collet internal screw threads are configured to engage the bolt, such that, when the bolt is rotated a first direction relative to the lower collet, the upper collet and the lower collet are configured to be compressed together by the bolt. The compression by the bolt results in the expansion of the upper-collet and the lower-collet.

Abstract: An apparatus includes a battery pack with N battery bricks, each with a DC output voltage. The output of each brick is connected in series providing a bus voltage. Each brick includes battery power modules (“BPMs”) connected in parallel and each connected to a battery cell. Each BPM charges/discharges the connected battery cell. Each brick has a battery brick controller that provides a control signal to each brick's BPMs. A control signal of a BPM is derived from a BPM error signal that includes a battery cell current of the battery cell of BPM subtracted from a summation of an average current signal, a local droop current and a balancing current. The balancing current is based on a current SOC of the battery cell connected to the BPM and a desired SOC for the battery cell connected to the BPM. A BMS derives the balancing current for the BPMs.

Abstract: This disclosure relates to red mud compositions. This disclosure also relates to methods of making red mud compositions. This disclosure additionally relates to methods of using red mud compositions.

Abstract: Examples of the present disclosure include a lens. The lens includes a body of a contact lens. The body has a side. The lens includes a plurality of nodes formed onto the side. Each of the plurality of nodes has a parameter value that is based on a reduction of transmission of light through the lens at one or more wavelengths selected to alter a color perception and/or a color discriminability of a wearer of the lens. The parameter value includes a value of: a distance between the node and an adjacent node of the plurality of nodes, a dimension of the node, a configuration of an arrangement in which the plurality of nodes are arranged on the side, a composition of a material coating the node, and/or a material composition of the node.

Abstract: For communicating securely between network nodes, a method transmits a port knock sequence comprising ordered empty protocol packets from an origination node to a destination Internet Protocol (IP) address of a destination node. The port knock sequence encodes at least one vocabulary phrase. The method transmits the length of the at least one vocabulary phrase to first and second helper nodes. The method generates a corresponding substitute phrase for each at least one vocabulary phrase through communication between the first helper node and the second helper node. The method receives the corresponding substitute phrase for each at least one vocabulary phrase at the origination node and the destination node. The method generates a node nonce based on the at least one corresponding substitute phrase. The method securely communicates between the origination node and the destination node using the node nonce.

Abstract: Hands-free walking devices and methods of constructing the same are described herein. The devices can include a receiving member to receive a portion of a patient's leg above a patient's knee and one or more hinges connected to the receiving member. One or more vertical members can be each connected to one of the hinges. A ground-contact member can be connected to the vertical members. The receiving member can transfer at least a portion of the patient's weight through the vertical members to the ground-contact member. The hinges can rotate about an axis about which the patient's knee also rotates while walking to support a natural gait.

Abstract: An apparatus for UV-A light dehydration of foods includes a light source configured to expose one or more pieces of food in a chamber to ultraviolet (“UV”)-A light to dehydrate the one or more pieces of food. The apparatus has an air flow source configured to provide air flow in the chamber across the one or more pieces of food while being exposed to the UV-A light. Air of the air flow has a relative humidity of less than 50 percent. The apparatus has a controller configured to remove the one or more pieces of food being exposed to the UV-A light and air flow in response to moisture in the one or more pieces of food being below a moisture threshold.

Abstract: An accelerometer includes a vacuum chamber to receive one or more pairs of laser beams and a nanoparticle. Each laser beam includes an axis and a focus having three dimensions. The nanoparticle is trapped in an oscillating state in a substantially overlapping three-dimensional foci of the one or more pairs of laser beams. A processor calculates an acceleration of the nanoparticle based on changes in position of the oscillating nanoparticle. At least one photodetector identifies spatial coordinates of the oscillating nanoparticle. The at least one photodetector includes a plurality of photodetectors that are aligned to sense interference between light from a first laser beam and light from the first laser beam that is scattered by the oscillating nanoparticle. The one or more pairs of laser beams may be collinear. The one or more pairs of laser beams may be configured to point at each other.

Abstract: For tracking a target, a method receives a combined signal comprising a target signal reflected by a target and a transmitter signal not reflected by the target, wherein the transmitter signal is comprised of a plurality of orthogonal frequency division multiplexing (OFDM) subcarrier signals. The method calculates a signal Fourier transform for the combined signal to obtain the complex symbols. The method estimates a sequence of channel state information. The method estimates CSI over for non-pilot OFDM subcarriers of the combined signal to obtain CSI for a sequence of M OFDM symbols. The method computes a CSI Fourier transform for the sequence of CSI for a plurality of OFDM subcarriers. The method estimates a CSI Doppler frequency by matching a Fourier transform template to the CSI Fourier transform. The method computes each of a target position and a target velocity vector for the target.

Abstract: A counter-swarm firework includes a shell casing, multiple streamers positioned in the shell casing, a burst charge positioned in the shell casing and configured to disperse the multiple streamers from the shell casing when discharged, a pusher plate positioned in the shell casing between the burst charge and the multiple streamers, a fire suppressant layer positioned between the burst charge and the pusher plate, and a kick charge configured to launch the shell casing and its contents prior to discharging the burst charge. The fire suppression layer may be configured to suppress heat generated by the discharge of the burst charge.

Abstract: Described herein are compounds and compositions for electrolytes based on bidentate and monodentate fluorinated alcohols. Also described are batteries that include the compounds and electrolytes described herein.

Abstract: A climbing cam can include a stem forming the main body of the climbing cam. A moveable latch can be disposed on the stem and operable to tether the steam to a climbing harness of a climber. A spring-loaded cam lobe can be disposed on a first end of the stem. A trigger can be connected to the cam lobe so that the trigger is actuatable to retract the cam lobe from an expanded position to a retracted position and to open the moveable latch, allowing the stem to untether from the climbing harness when the cam lobe is in the retracted position.

Abstract: A climbing cam can include a stem forming the main body of the climbing cam. A moveable latch can be disposed on the stem and operable to tether the steam to a climbing harness of a climber. A spring-loaded cam lobe can be disposed on a first end of the stem. A trigger can be connected to the cam lobe so that the trigger is actuatable to retract the cam lobe from an expanded position to a retracted position and to open the moveable latch, allowing the stem to untether from the climbing harness when the cam lobe is in the retracted position.

Abstract: A power converter includes a primary H-bridge with switches and an LCL-Transformer section with a first inductor with a first end connected to a first terminal of the primary H-bridge, a capacitor connected between a second end of the first inductor and a second terminal of the primary H-bridge, and a second inductor with a first end connected to the second end of the first inductor. The converter includes a transformer with a primary connected between a second end of the second inductor and the second terminal of the primary H-bridge, a secondary H-bridge with switches with an input connected to a secondary side of the transformer, and an output capacitor connected across output terminals of the secondary H-bridge. The primary H-bridge is fed by a DC constant current source and the output terminals of the secondary H-bridge have a regulated DC output voltage are connected to a load.

Abstract: A device is disclosed for deflating a gas cavity about a projectile formed upon entry of the projectile into a liquid. The device can include a wall coupleable with a body operable as a projectile and defining an exterior and an interior space. The wall can be oriented toward a trailing end relative to a leading end defined by the body. The device can also include at least one inlet to facilitate gas flow from the exterior to the interior space. An outlet can facilitate gas flow from the interior space to the exterior and can be oriented toward the trailing end relative to the at least one inlet. Upon entry of the body and the wall into a liquid and formation of a gas cavity about a portion of the body and the wall, the at least one inlet can be located within the gas cavity and the outlet can be located outside the gas cavity, such that gas flows from the exterior through the at least one inlet to the interior space, and from the interior space through the outlet to the exterior to deflate the gas cavity.

Abstract: An apparatus for a high-power reflexive field containment circuit topology for dynamic wireless power transfer systems is disclosed. A wireless power transfer (“WPT”) charging apparatus includes an inverter configured to connect with a direct current (“DC”) source on an input side and one or more WPT charging branches. Each WPT charging branch includes a WPT charging pad circuit with a WPT charging pad connected in series with a first series charging capacitor, a parallel charging capacitor connected in parallel with the WPT charging pad circuit, and a series charging impedance connected in series between an output of the inverter and a connection between the WPT charging pad circuit and the parallel charging capacitor. The series charging impedance includes a second series charging capacitor and/or a series charging inductor.