Abstract: Methods and systems are provided for controlling automatic travel of a power machine, including a mower, along a work path associated with a geographical area. As unknown objects are detected along a current work path, new work paths can be determined for a remaining portion of the geographical area (e.g., an area not yet mowed).

Abstract: A system for coating a non-rotating pipe work piece including: valves, flow lines, and a mixing block for receiving a first and a second component material each delivered at a pressure, flow measurement devices to measure the flows of the components, a static mixer in fluid communication with the mixing block for receiving the combined components, a C-shaped plate member arranged around the work piece, a drive mechanism to oscillate a partial rotation of the C-shaped member about the work piece with the rate of oscillations controlled by a logic controller, at least two spray guns disposed on the C-shaped member to spray towards the outside surface of the work piece, a drive mechanism to traverse the at least two spray guns longitudinally with the rate of traverse controlled by a logic controller; and the logic controller(s) programmed to control based on a number of input and measured parameters.

Abstract: A system for coating a non-rotating pipe work piece including: valves, flow lines, and a mixing block for receiving a first and a second component material each delivered at a pressure, flow measurement devices to measure the flows of the components, a static mixer in fluid communication with the mixing block for receiving the combined components, a C-shaped plate member arranged around the work piece, a drive mechanism to oscillate a partial rotation of the C-shaped member about the work piece with the rate of oscillations controlled by a logic controller, at least two spray guns disposed on the C-shaped member to spray towards the outside surface of the work piece, a drive mechanism to traverse the at least two spray guns longitudinally with the rate of traverse controlled by a logic controller; and the logic controller(s) programmed to control based on a number of input and measured parameters.

Abstract: A system for purging a plural component coating application system including: a first pressure regulator for receiving an inert gas, providing the gas at a first pressure; a first valve; a first operator connected to the first valve capable of being controlled by a logic controller; a first check valve; a mixing manifold; a second pressure regulator for receiving an inert gas, providing the gas at a second pressure that is less than the first pressure; a second valve; a second operator connected to the second valve capable of being controlled by a logic controller; a second check valve; a static mixer in fluid communication with the mixing manifold; an outlet from the static mixer for receiving a connection to at least two spraying members; and where the second regulator is capable of providing the second pressure at a pressure that is less than one-fifth of the first pressure.

Abstract: A system for purging a plural component coating application system including: a first pressure regulator for receiving an inert gas, providing the gas at a first pressure; a first valve; a first operator connected to the first valve capable of being controlled by a logic controller; a first check valve; a mixing manifold; a second pressure regulator for receiving an inert gas, providing the gas at a second pressure that is less than the first pressure; a second valve; a second operator connected to the second valve capable of being controlled by a logic controller; a second check valve; a static mixer in fluid communication with the mixing manifold; an outlet from the static mixer for receiving a connection to at least two spraying members; and where the second regulator is capable of providing the second pressure at a pressure that is less than one-fifth of the first pressure.

Abstract: A Quick Release Attachment and Detachment system comprising a protective outer garment including a shirt with an attached loop fastening material, a bib apron without neck straps, and a quick release attachment and detachment device fastened to the garment, wherein the device includes hook fastening material, wherein the device is configured to couple the bib apron to the shirt.

Abstract: A system and method for downloading information from a content server to a mobile device in communication with a wireless communication network. The mobile device is assigned a network address and registers with the content server by providing the network address as an identification information. The content server establishes a communication channel to the mobile device by opening a socket to the network address and downloads the information to the mobile device through the communication channel. If the content server cannot open a communication channel to the network address, the content server sends a message to the mobile device.

Abstract: A system and method for downloading information from a content server to a mobile device in communication with a wireless communication network. The mobile device is assigned a network address and registers with the content server by providing the network address as an identification information. The content server establishes a communication channel to the mobile device by opening a socket to the network address and downloads the information to the mobile device through the communication channel. If the content server cannot open a communication channel to the network address, the content server sends a message to the mobile device.

Abstract: A power amplifier protection system to sense one or more operating conditions of a power amplifier and regulate the power of the input signal to the power amplifier as a response to one or more of the sensed operating conditions. This dynamic protection system may protect a power amplifier from failure by monitoring such operating conditions as power output and temperature and reducing the amplitude of the input signal if the power amplifier is operating beyond specified levels.

Abstract: Method and apparatus for power control in an RF amplifier having reduced noise and moderate gain slope. In one embodiment, a multistage RF amplifier includes a first stage having a transconductance amplifier with an output coupled to a variable gain amplifier, with the gain control including control of the collector-emitter voltage of the output transistor of the variable gain amplifier. In another embodiment, the variable gain amplifier is replaced with a single transistor, with the gain control including control of the collector-emitter voltage of the single transistor. Reduction of the collector-emitter voltage followed by a reduction in the base-emitter voltage of the second stage for reduced gain of the amplifier reduces noise in the amplifier output for reduced gains, typically providing a monotonically decreasing noise with gain reduction.

Abstract: A method and apparatus for improved power control of a radio frequency power amplifier achieved by limiting the maximum power of the radio frequency signal and varying the power of the radio frequency signal according to one or more power control feedback signals. In particular, the maximum power is limited by limiting the average current of the RF signal to a predetermined maximum value, despite the changing amplitude of the RF signal, thereby limiting the power of the radio signal and preventing the power control signals to the power varying circuit from being overwhelmed and/or maintaining stability.

Abstract: A pipeline treating apparatus (10) is disclosed which is used to clean the exterior of a pipeline (12) with high pressure air with entrained abrasive. The apparatus has an improved classifier and separator to separate the abrasive grit from lighter debris which includes a classifier and separator within a manifold duct (56) which returns the grit to a collection pan (40) for recovery and causes the lighter airborne dust to be removed through a return duct (58). A series of pressure relief filters (82) reduce the air pressure within a blast chamber (28) and resist debris escaping from the blast chamber past the triple seals (76, 78, 80). The blast nozzle assemblies (834) are attached to the nozzle oscillating frames by snap fittings (74) which avoids threaded connections which may become contaminated by the debris.

Abstract: A power amplifier protection system to sense one or more operating conditions of a power amplifier and regulate the power of the input signal to the power amplifier as a response to one or more of the sensed operating conditions. This dynamic protection system may protect a power amplifier from failure by monitoring such operating conditions as power output and temperature and reducing the amplitude of the input signal if the power amplifier is operating beyond specified levels.

Abstract: A pipeline treating apparatus (350) is disclosed which includes a main frame (352) and a pair of wings (354, 356) pivotally mounted to the main frame for surrounding a pipeline to be treated. Each wing mounts at least one bracket (390, 392) for oscillating motion about a portion of the exterior of the pipeline surface. Each bracket mounts at least one nozzle (382) for treating the outer surface of the pipeline. A single drive motor on each wing can drive a pair of brackets, each bracket being oscillated a different arcuate length than the other bracket, if desired. The number of nozzles mounted on each bracket can be varied to address a specific treatment problem.

Abstract: A pipeline treating apparatus (600) is disclosed which has a pair of pivotally mounted housing sections (604,608) and a pair of separately pivotal nozzle frames (610, 612). A nozzle plate is mounted on each of the nozzle frames and carries a plurality of nozzles (622). A drive mechanism on the nozzle frames oscillates the nozzle plate a predetermined arcuate distance around the circumference of the pipeline so that the nozzles treat the entire outer surface of the pipeline. The housing sections and nozzle frames are separately pivotal from a removal position, to allow removal of an installation of the apparatus on the pipeline, to a operational position concentric about the pipeline for performing the treating operation.

Abstract: A plug (10) is disclosed which is clamped to the end of a first pipeline section (14) being worked on by a line travel device (12). The line travel device (12) can completely perform its operation on the first pipeline section and move on to the plug. The plug is then unclamped from the first pipeline section and the plug and line travel device are moved together to the second pipeline section (16) to be worked on. The plug is clamped to the second pipeline section (16) to be worked on and the line travel device moves off the plug onto the second pipeline section to perform its operation on the entire length of the section.

Abstract: An automated pipeline rehabilitation apparatus (10) is disclosed. The apparatus employs a centering assembly (24) with pivoting arms (26, 28) which can pivot between an operating position and an installation/removal position to allow the unit to be removed from a pipeline. Arcuate rings (38, 40) are mounted on the arms. Spray nozzles (44) are mounted on the arcuate rings for reciprocating arcuate motion along the rings to treat the pipeline. The nozzles (44) can be used to clean the pipeline and prepare the outer surface of the pipeline with high pressure water jets with entrained abrasives. The nozzles (44) can also be used to apply a coating, preferably a polyurethane coating to the pipeline. A nozzle assembly (200) can be used to mount a spray gun (204) on the apparatus. The nozzle assembly permits easy adjustment of the nozzle position in two different directions to insure a consistent spray pattern. The nozzle assembly also provides for reversal of the tip of the nozzle for cleaning.

Abstract: An automated pipeline rehabilitation apparatus (10) is disclosed. The apparatus employs a centering assembly (24) with pivoting arms (26, 28) which can pivot between an operating position and a installation/removal position to allow the unit to be removed from a pipeline. Arcuate rings (38, 40) are mounted on the arms. Spray nozzles (44) are mounted on the arcuate rings for reciprocating arcuate motion along the rings to treat the pipeline. The nozzles (44) can be used to clean the pipeline and prepare the outer surface of the pipeline with high pressure water jets in training abrasives. The nozzles (44) can also be used to apply a coating, preferably a polyurethane coating to the pipeline.

Abstract: A temporary platform encircling a concrete pressure vessel carries endless rails on which a mobile unit runs. The unit has a supply drum from which is drawn pre-stressing wire anchored at its free end in one of many channels in the outside wall of the vessel. The wire leaves the unit via a tensioning unit and a payout sheave both carried by the mobile unit. Hoist ropes fixed at intervals around the platform and connected to winches lift and lower the platform to locate the sheave at the level of each channel in turn.

Abstract: A power amplifier protection system to sense one or more operating conditions of a power amplifier and regulate the power of the input signal to the power amplifier as a response to one or more of the sensed operating conditions. This dynamic protection system may protect a power amplifier from failure by monitoring such operating conditions as power output and temperature and reducing the amplitude of the input signal if the power amplifier is operating beyond specified levels.