Abstract: A disclosed radio frequency (RF) system, such as a cognitive radar, includes a software defined radio (SDR), an adaptive transmit amplifier, and a host computer. The system performs multi-dimensional optimization operations including selecting initial values for two or more configuration parameters, such as load impedance and input power. Disclosed methods iteratively perform image completion operations until a convergence criterion is satisfied. The image completion operations may include measuring a performance of the RF device to obtain a measured performance corresponding to the initial values of the configuration parameters, storing the measured performance as a point on a measured load-pull contour image, performing a load-pull extrapolation to extrapolate, from the configuration parameter values, predicted optimal values for the configuration parameters, and saving the predicted optimal values as the configuration parameter values for a next iteration of the image completion operations.

Abstract: An adjustable carriage assembly is configured to be mounted on a frame member of a weight rack and includes a locking structure for locking the carriage assembly in place on the frame member. The carriage assembly may include a moveable carriage with a plurality of rollers that engage the frame member, as well as one or more handles for gripping to adjust the position of the carriage assembly and a connection structure for connection of an implement or accessory. Various implements and accessories can be connected to or used in connection with the carriage assembly, including various weightlifting implements and accessories that are pivotably connected to the carriage assembly.

Abstract: An adjustable carriage assembly is configured to be mounted on a frame member of a weight rack and includes a locking structure for locking the carriage assembly in place on the frame member. The carriage assembly may include a moveable carriage with a plurality of rollers that engage the frame member, as well as one or more handles for gripping to adjust the position of the carriage assembly and a connection structure for connection of an implement or accessory. Various implements and accessories can be connected to or used in connection with the carriage assembly, including various weightlifting implements and accessories that are pivotably connected to the carriage assembly.

Abstract: A disclosed radio frequency (RF) system, such as a cognitive radar, includes a software defined radio (SDR), an adaptive transmit amplifier, and a host computer. The system performs optimization operations including selecting an initial impedance as a load impedance for the RF device and iteratively performing image completion operations until a convergence criterion is satisfied. The image completion operations may include measuring a performance of the RF device to obtain a measured performance corresponding to the load impedance, storing the measured performance as a point on a measured load-pull contour image, performing a load-pull extrapolation to extrapolate, from the load impedance, a predicted optimal impedance, and saving the predicted impedance as the load impedance for a next iteration of the image completion operations. The convergence criterion may be satisfied when a predicted impedance matches one of the previously measured impedances.

Abstract: Embodiments provide a lacrosse stick having a continuous juncture-handle portion and a flexible head portion molded to the juncture-handle portion, and a method for making the lacrosse stick. The juncture-handle portion may include first and second fork members extending from a throat member in a forward direction, a handle portion extending from the throat member in a rearward direction, and a first tab reinforcing member extending from the handle portion, through the throat member, and to the first fork member, and defining a first tab protruding beyond a distal forward end of the first fork member. The throat member, first and second fork members, and handle portion may be integrally formed of a first composite layup material, with the first tab reinforcing member formed of a stiffer second composite layup material. The head portion may include a first sidewall portion molded over the first tab reinforcing member.

Abstract: An adjustable carriage assembly is configured to be mounted on a frame member of a weight rack and includes a moveable carriage with a plurality of rollers that engage the frame member, as well as a connection structure for connection of an articulating implement. A releasable pin is mounted on the carriage proximate to a rear of the carriage and has an arm configured for engagement to move the releasable pin. The releasable pin is moveable by axial translation between a locked position and an unlocked position to selectively engage the frame member to lock the carriage in position or permit movement of the carriage. A removable pin may be removably received through a pin hole in the carriage to extend through the passage in a direction perpendicular to a direction of axial translation of the releasable pin, to engage the frame member to prevent movement of the carriage.

Abstract: A disclosed radio frequency (RF) system, such as a cognitive radar, includes a software defined radio (SDR), an adaptive transmit amplifier, and a host computer. The system performs optimization operations including selecting an initial impedance as a load impedance for the RF device and iteratively performing image completion operations until a convergence criterion is satisfied. The image completion operations may include measuring a performance of the RF device to obtain a measured performance corresponding to the load impedance, storing the measured performance as a point on a measured load-pull contour image, performing a load-pull extrapolation to extrapolate, from the load impedance, a predicted optimal impedance, and saving the predicted impedance as the load impedance for a next iteration of the image completion operations. The convergence criterion may be satisfied when a predicted impedance matches one of the previously measured impedances.

Abstract: Embodiments provide a lacrosse stick having a continuous juncture-handle portion and a flexible head portion molded to the juncture-handle portion, and a method for making the lacrosse stick. The juncture-handle portion may include first and second fork members extending from a throat member in a forward direction, a handle portion extending from the throat member in a rearward direction, and a first tab reinforcing member extending from the handle portion, through the throat member, and to the first fork member, and defining a first tab protruding beyond a distal forward end of the first fork member. The throat member, first and second fork members, and handle portion may be integrally formed of a first composite layup material, with the first tab reinforcing member formed of a stiffer second composite layup material. The head portion may include a first sidewall portion molded over the first tab reinforcing member.

Abstract: An adjustable carriage assembly is configured to be mounted on a frame member of a weight rack and includes a moveable carriage with a plurality of rollers that engage the frame member, as well as a connection structure for connection of an articulating implement. A releasable pin is mounted on the carriage proximate to a rear of the carriage and has an arm configured for engagement to move the releasable pin. The releasable pin is moveable by axial translation between a locked position and an unlocked position to selectively engage the frame member to lock the carriage in position or permit movement of the carriage. A removable pin may be removably received through a pin hole in the carriage to extend through the passage in a direction perpendicular to a direction of axial translation of the releasable pin, to engage the frame member to prevent movement of the carriage.

Abstract: Embodiments provide a lacrosse head having a pocket stringing system that includes attachment members that allow for rapid, direct attachment of a pocket to the head. A lacrosse head may include cleats protruding from the sidewalls at a rearward portion of the pocket area nearest the juncture, sidewall hooks protruding from the sidewalls at a forward portion of the pocket area forward of the rearward portion, and scoop hooks protruding in the forward direction from the front face of the scoop. Each cleat may have a rearwardly-projecting arm and a forwardly-projecting arm. Each sidewall hook may have a rearwardly-projecting arm. A first scoop hook may tension a pocket toward a first sidewall hook on a first sidewall, and a second scoop hook may tension the pocket toward a second sidewall hook on a second sidewall, so as to form a ball channel in the pocket.

Abstract: A disclosed radio frequency (RF) system, such as a cognitive radar, includes a software defined radio (SDR), an adaptive transmit amplifier, and a host computer. The system performs optimization operations including selecting an initial impedance as a load impedance for the RF device and iteratively performing image completion operations until a convergence criterion is satisfied. The image completion operations may include measuring a performance of the RF device to obtain a measured performance corresponding to the load impedance, storing the measured performance as a point on a measured load-pull contour image, performing a load-pull extrapolation to extrapolate, from the load impedance, a predicted optimal impedance, and saving the predicted impedance as the load impedance for a next iteration of the image completion operations. The convergence criterion may be satisfied when a predicted impedance matches one of the previously measured impedances.

Abstract: An article includes a ceramic material and features a machined surface that is characteristic of cold ablation laser machining, and the machined surface exhibits no visible oxidation. A laser machining apparatus and technique is based on cold-ablation, but is modified or augmented with an inert assist gas, to minimize deleterious surface modifications and mitigate the oxide formation associated with laser machining.

Abstract: An article includes a ceramic material and features a machined surface that is characteristic of cold ablation laser machining, and the machined surface exhibits no visible oxidation. A laser machining apparatus and technique is based on cold-ablation, but is modified or augmented with an inert assist gas to minimize deleterious surface modifications and mitigate oxide formation associated with laser machining.

Abstract: Embodiments provide a lacrosse head with an enhanced pocket channel and sweet spot. The head includes first and second tabs protruding rearwardly from the rearward face of the transverse wall, with the transverse wall defining at least one inner pocket member opening disposed between first and second outer pocket member openings on the respective tabs. A first rearwardmost pocket-supporting edge of the first tab, a second rearwardmost pocket-supporting edge of the at least one inner pocket member opening, and a third rearwardmost pocket-supporting edge of the second tab may lie on an arc shape that is more curved than the curved shape of the transverse wall, to provide a cylindrically-shaped pocket channel. Each sidewall may have a rearward lower edge portion that extends generally parallel to the horizontal centerline and an intermediate lower edge portion that rapidly descends to a lowest point, to enhance the sweet spot of the head.

Abstract: An adjustable carriage assembly is configured to be mounted on a frame member of a weight rack and includes a locking structure for locking the carriage assembly in place on the frame member. The carriage assembly may include a moveable carriage with a plurality of rollers that engage the frame member, as well as one or more handles for gripping to adjust the position of the carriage assembly and a connection structure for connection of an implement or accessory. Various implements and accessories can be connected to or used in connection with the carriage assembly, including various weightlifting implements and accessories that are pivotably connected to the carriage assembly.

Abstract: Embodiments provide a lacrosse head having a pocket stringing system that includes attachment members that allow for rapid, direct attachment of a pocket to the head. A lacrosse head may include cleats protruding from the sidewalls at a rearward portion of the pocket area nearest the juncture, sidewall hooks protruding from the sidewalls at a forward portion of the pocket area forward of the rearward portion, and scoop hooks protruding in the forward direction from the front face of the scoop. Each cleat may have a rearwardly-projecting arm and a forwardly-projecting arm. Each sidewall hook may have a rearwardly-projecting arm. A first scoop hook may tension a pocket toward a first sidewall hook on a first sidewall, and a second scoop hook may tension the pocket toward a second sidewall hook on a second sidewall, so as to form a ball channel in the pocket.

Abstract: An adjustable carriage assembly is configured to be mounted on a frame member of a weight rack and includes a locking structure for locking the carriage assembly in place on the frame member. The carriage assembly may include a moveable carriage with a plurality of rollers that engage the frame member, as well as one or more handles for gripping to adjust the position of the carriage assembly and a connection structure for connection of an implement or accessory. Various implements and accessories can be connected to or used in connection with the carriage assembly, including various weightlifting implements and accessories that are pivotably connected to the carriage assembly.

Abstract: A lacrosse head configured to form a pocket channel, the lacrosse head having a stop member, first and second sidewalls extending from the stop member in a forward direction, and a scoop connecting the first sidewall and the second sidewall opposite to the stop member, with the scoop having a forward edge and a rearward edge, with the rearward edge of the scoop defining generally an arc shape except for a recessed portion disposed at a longitudinal centerline of the lacrosse head, and with the scoop defining at least one stringing hole disposed forward of the recessed portion. Alternatively, a lacrosse head may have a scoop that defines a plurality of lateral stringing holes disposed generally along an arc, and that defines a forwardly offset stringing hole disposed along a longitudinal centerline of the lacrosse head and forward of the arc.