Abstract: Aspects of the technology relate to propulsion systems for high altitude, long duration balloons, such as balloons that operate in the stratosphere for weeks, months or longer. A propeller assembly is used to provide lateral directional adjustments, which allows the balloon to spend more time over a desired region, reduce the return time to the desired region, reduce fleet overprovisioning, and increases the safety case by additional controls and avoidance abilities. A control assembly manages operation of the propeller assembly, including setting the pointing direction, speed of rotation and determining when to turn on the propeller and for how long. The propulsion system including the control and propeller assemblies is rotatable around a connection member of the balloon. Such rotation is independently adjustable from any rotation of the balloon's payload. The propeller blades may be made of plastic, which reduces weight and cost while providing sufficient speed at stratospheric altitudes.

Abstract: Aspects of the technology relate to propulsion systems for high altitude, long duration balloons, such as balloons that operate in the stratosphere for weeks, months or longer. A propeller assembly is used to provide lateral directional adjustments, which allows the balloon to spend more time over a desired region, reduce the return time to the desired region, reduce fleet overprovisioning, and increases the safety case by additional controls and avoidance abilities. A control assembly manages operation of the propeller assembly, including setting the pointing direction, speed of rotation and determining when to turn on the propeller and for how long. The propulsion system including the control and propeller assemblies is rotatable around a connection member of the balloon. Such rotation is independently adjustable from any rotation of the balloon's payload. The propeller blades may be made of plastic, which reduces weight and cost while providing sufficient speed at stratospheric altitudes.

Abstract: An apparatus includes a frame component of a head-mounted device (HMD) configured to secure the HMD to a head of a user. The frame component includes therein a first compartment, a second compartment, and a channel connecting the first compartment and the second compartment. The frame component is configured to be positioned along a side of the head with the channel passing over an ear of the head, the first compartment disposed on a first side of the ear, and the second compartment disposed on a second side of the ear. The apparatus also includes a battery disposed within the first compartment, a processor disposed within the second compartment, and a heat pipe extending from the first compartment to the second compartment through the channel. The heat pipe is configured to transfer heat from the processor to the battery.

Abstract: A security apparatus for securing a portable electronic device to an immovable object includes a locking head having a base and a plurality of pillar structures extending from the base. The plurality of pillar structures is configured to be inserted into an aperture of the portable electronic device. The locking head also has a ball positioned within each of the plurality of pillar structures. The ball is extendable outwardly from a corresponding pillar structure to inhibit the locking head from being removed from the aperture. The locking head further has a linear movable structure positioned within each of the plurality of pillar structures and operable to selectively extend outwardly each ball from the plurality of pillar structures. The security apparatus also includes a security device attached to the locking head and configured to engage the immovable object.

Abstract: A security apparatus for securing a portable electronic device to an immovable object includes a locking head having a base and a first linear element extending from the base. The first linear element is configured to be inserted into the aperture of the portable electronic device. The locking head also has a movable engagement element coupled to an end of the first linear element opposite from the base. The movable engagement element is configured to be inserted into the aperture of the portable electronic device with the first linear element. The movable engagement element is movable to a position in which the movable engagement element is perpendicular to the first linear element to secure the locking head to the portable electronic device. The security apparatus also includes a security device attached to the locking head and configured to engage the immovable object.

Abstract: The technology relates to systems and methods for creating openings in ground material in order to install ground loops for geothermal heating and cooling applications. As an example, a system for creating an opening in ground material may include a first drill head configured as a pipe pulling drill head and a second drill head configured for attachment with a boring tool. When attached to an end of a pipe, the first drill head is configured to pull the pipe into the opening in ground material. The second drill head may include a drilling portion and an opening opposite of the drilling portion, the opening including a first chamber that tapers towards a second chamber. The first drill head also includes a drilling end configured for a locking fit within the second chamber.

Abstract: Systems and devices are disclosed herein that provide or relate to modular accessory devices for a wearable device, such as a glasses-style head-mountable device (HMD). Illustrative systems may include a first frame component having an accessory slot accessible via an entry point on a transverse surface of the first frame component, a second frame component movably coupled to the first frame component, and one or more accessory devices that each have a slot-mating feature shaped for insertion into and removal from the accessory slot via the entry point. The second frame component may be movable between a first position in which the second frame component blocks access to the entry point, and a second position in which the second frame component allows access to the entry point.

Abstract: A security apparatus for securing a portable electronic device to an immovable object includes a locking head having a base and a first linear element extending from the base. The first linear element is configured to be inserted into the aperture of the portable electronic device. The locking head also has a movable engagement element coupled to an end of the first linear element opposite from the base. The movable engagement element is configured to be inserted into the aperture of the portable electronic device with the first linear element. The movable engagement element is movable to a position in which the movable engagement element is perpendicular to the first linear element to secure the locking head to the portable electronic device. The security apparatus also includes a security device attached to the locking head and configured to engage the immovable object.

Abstract: A security apparatus for securing a portable electronic device to an immovable object includes a locking head having a base and a plurality of engagement portions extending from the base. The plurality of engagement portions is configured to be inserted into an aperture of the portable electronic device. The locking head also includes a linear portion positioned between the plurality of engagement portions and extending from the base. The linear portion is twistable about its length to move the plurality of engagement portions radially outward. The security apparatus further includes a security device attached to the locking head and configured to engage the immovable object.

Abstract: Aspects of the disclosure relate to manufacturing a balloon envelope for use in a stratospheric balloon system. For instance, a stream of polyethylene mixture us extruded through an extruder in order to orient molecules of polymer chains of polyethylene and to provide an oriented film. The oriented film is passed through an electron beam and thereby crosslinking the polymer chains to provide a cross-linked film.

Abstract: A security apparatus for securing a portable electronic device to an immovable object includes a locking head having a base and a plurality of engagement portions extending from the base. The plurality of engagement portions is configured to be inserted into an aperture of the portable electronic device. The locking head also includes a linear portion positioned between the plurality of engagement portions and extending from the base. The linear portion is twistable about its length to move the plurality of engagement portions radially outward. The security apparatus further includes a security device attached to the locking head and configured to engage the immovable object.

Abstract: A security apparatus for securing a portable electronic device to an immovable object includes a locking head having a base and a plurality of engagement portions extending from the base. The plurality of engagement portions is configured to be inserted into an aperture of the portable electronic device. The locking head also includes a linear portion positioned between the plurality of engagement portions and extending from the base. The linear portion is twistable about its length to move the plurality of engagement portions radially outward. The security apparatus further includes a security device attached to the locking head and configured to engage the immovable object.

Abstract: A security apparatus for a portable electronic device includes a locking head having a base and an engagement element extending from the base and adapted to be inserted into an aperture of the portable electronic device. The engagement element includes a wedge-shaped engagement portion configured to engage part of the portable electronic device when inserted into the aperture. The locking head also has a stabilizing element extending from the base and slidable along a side of the engagement element into the aperture of the portable electronic device, thereby inhibiting the engagement element from being removed from the aperture. The security apparatus further includes a security device attached to the locking head and configured to engage the immovable object.

Abstract: A security apparatus for a portable electronic device includes a locking head having a base and an engagement element extending from the base and adapted to be inserted into an aperture of the portable electronic device. The engagement element includes a wedge-shaped engagement portion configured to engage part of the portable electronic device when inserted into the aperture. The locking head also has a stabilizing element extending from the base and slidable along a side of the engagement element into the aperture of the portable electronic device, thereby inhibiting the engagement element from being removed from the aperture. The security apparatus further includes a security device attached to the locking head and configured to engage the immovable object.

Abstract: A security apparatus for securing a portable electronic device to an immovable object includes a locking head having a base and a plurality of engagement portions extending from the base. The plurality of engagement portions is configured to be inserted into an aperture of the portable electronic device. The locking head also includes a linear portion positioned between the plurality of engagement portions and extending from the base. The linear portion is twistable about its length to move the plurality of engagement portions radially outward. The security apparatus further includes a security device attached to the locking head and configured to engage the immovable object.

Abstract: A security apparatus for securing a portable electronic device to an immovable object includes a head having a base. The head also includes a plurality of engagement elements extending from the base and configured to be inserted into an aperture of the portable electronic device. The plurality of engagement elements is movable relative to the body while inserted into the aperture to engage a portion of the portable electronic device. The head further includes a linear element positioned between the plurality of engagement elements. The linear element is movable relative to the plurality of engagement elements to push the plurality of engagement elements radially outward. The security apparatus also includes a security device attached to the head and configured to engage the immovable object.

Abstract: A display panel comprises a display layer including a plurality of pixel arrays offset from each other by spacing regions and a screen layer disposed over the display layer with each of the pixel arrays aligned to project an image portion onto a corresponding portion of the screen layer. The screen layer includes a transparent substrate and an array of upper spacer supports to support the transparent substrate a first fixed distance from the display layer. Each of the upper spacer supports is positioned on one of the spacing regions.

Abstract: An example electronic display system including a housing with a recess, a top side, and a bottom side opposite the top side and a kickstand having a first end and a second end opposite the first end, the first end being rotatably coupled to the housing proximate the bottom side, and the second end being rotationally biased away from the housing. A variable friction assembly is coupled to the first end. The kickstand has a first position in which the second end is received within the recess, and a second position in which the second end is substantially rotatably separated from the recess. Further, the variable friction assembly applies a first friction load to the first end when the kickstand is the first position, and a second friction load when the kickstand is in the second position, wherein the first friction load is greater than the second friction load.

Abstract: A security apparatus for securing a portable electronic device to an immovable object includes a head having a base. The head also includes a plurality of engagement elements extending from the base and configured to be inserted into an aperture of the portable electronic device. The plurality of engagement elements is movable relative to the body while inserted into the aperture to engage a portion of the portable electronic device. The head further includes a linear element positioned between the plurality of engagement elements. The linear element is movable relative to the plurality of engagement elements to push the plurality of engagement elements radially outward. The security apparatus also includes a security device attached to the head and configured to engage the immovable object.

Abstract: A support assembly has a base that is pivotable with respect to an arm. A rotatable cam is provided that has a non-circular profile. A biasing assembly is linked to the cam.