Abstract: A head wearable air purifier is provided. The head wearable air purifier includes a first speaker assembly and a second speaker assembly. The first speaker assembly includes a filter assembly, a motor-driven impeller for creating an airflow through the filter assembly, and an air outlet downstream from the filter assembly for emitting a filtered airflow from the speaker assembly. The head wearable air purifier further includes a nozzle and a control circuit. The nozzle is arranged to receive the filtered airflow from the first speaker assembly. Further, the nozzle includes an air outlet arranged to emit the received filtered airflow from the head wearable air purifier. The control circuit is arranged to control a rotational speed of the motor-driven impeller of the first speaker assembly such that the maximum rotational speed of the motor-driven impeller is from 9,000 to 18,000 RPM.

Abstract: There is provided an ear cup including a housing containing a filter assembly and a motor-driven impeller for creating an airflow through the filter assembly, the housing including an air outlet downstream from the filter assembly for emitting the filtered airflow from the housing. The ear cup further includes an acoustic driver carried by the housing, a reference internal noise sensor carried by the housing, and active noise control circuitry that is configured to use a signal provided by the reference internal noise sensor to operate the acoustic driver.

Abstract: A method and apparatus is disclosed for chime damping. A chime includes a suspension element from which hangs a sound generating element, such as one or more chime tubes or a side wall of a bell chime. A cord retractor is affixed to the suspension element and a center cord is secured to the cord retractor to be windable and unwindable between retracted and extended positions. A damper, a clapper, and/or a windcatcher are affixed to the center cord. Moving the center cord between retracted and extended positions alters the relative position of the damper, the clapper, and/or the windcatcher with respect to the suspension element and the sound generating element to cause noise generation or noise damping.

Abstract: A method for fabricating a component of an abatement apparatus is disclosed. The method comprises: meshing a 3D model representation of a component defining a reaction chamber of an abatement apparatus based on specified component characteristics to define an optimised finite element representation of the component; and fabricating the optimised finite element representation. In this way, a 3D model of a component of an abatement apparatus can be generated from which its performance can be modelled. Particular characteristics of the component may be defined which affect the operation of the abatement apparatus. Those characteristics may then be used to generate the optimized finite element representation of the component which has those characteristics using meshing (it will be appreciated that meshing is the operation of representing a geometric object as a set of finite elements).

Abstract: Aspects and embodiments relate to plasma torch device component monitoring, a plasma torch device component monitoring system and a plasma torch device including such a monitoring system or suitable for use with such a system. The monitoring method comprises: collecting electromagnetic radiation generated by a plasma torch in a plasma torch device; analysing the collected electromagnetic radiation generated by the plasma torch; comparing the analysed electromagnetic radiation generated to known electromagnetic radiation associated with one or more components of the plasma torch device; and triggering one or more actions in the event that the analysed emission differs from the known emission. Such a monitoring method can allow for ameliorative action to be taken in the event that degradation of one or more components forming the device is detected.

Abstract: There is provided an ear cup including a housing containing a filter assembly and a motor-driven impeller for creating an airflow through the filter assembly, the housing including an air outlet downstream from the filter assembly for emitting the filtered airflow from the housing. The ear cup further includes an acoustic driver mounted to the housing, a reference internal noise disposed within the housing and a reference ambient noise mounted to the housing. The ear cup further includes active noise control circuitry that is configured to simultaneously use both a signal provided by the reference internal noise and the signal provided by the reference ambient noise to operate the acoustic driver.

Abstract: A chock charging stand provides a framework for retaining an inductive charging plate for charging one or more chocks. Chocks may have light source(s) to emit light during low-light conditions. Chocks may charge using inductance, wired connection, and/or renewable energy production. Chocks may have transmitter-receivers for communicating with a master control and/or smart device.

Abstract: There is provided an ear cup including a housing containing a filter assembly and a motor-driven impeller for creating an airflow through the filter assembly, the housing including an air outlet downstream from the filter assembly for emitting the filtered airflow from the housing. The ear cup further includes an acoustic driver carried by or mounted to, either directly or indirectly, the housing, a reference internal noise sensor disposed within the housing, and a reference ambient noise sensor carried by or mounted to, either directly or indirectly, the housing. The ear cup further includes active noise control circuitry that is configured, in a first operating state, to use a signal provided by the reference internal noise sensor to operate the acoustic driver and, in a second operating state, to use a signal provided by the reference ambient noise sensor to operate the acoustic driver.

Abstract: A method and apparatus is disclosed for chime damping. A chime includes a suspension element from which hangs a sound generating element, such as one or more chime tubes or a side wall of a bell chime. A cord retractor is affixed to the suspension element and a center cord is secured to the cord retractor to be windable and unwindable between retracted and extended positions. A damper, a clapper, and/or a windcatcher are affixed to the center cord. Moving the center cord between retracted and extended positions alters the relative position of the damper, the clapper, and/or the windcatcher with respect to the suspension element and the sound generating element to cause noise generation or noise damping.

Abstract: Aspects relate to monitorable plasma torch device components and in particular to monitoring and predictive maintenance of one or more such monitorable plasma torch device components. One aspect provides a monitorable plasma torch device component, the component comprising: a component body and a sacrificial component located in an erosion zone of the component body. The sacrificial component comprises material which differs from the plasma torch device component body and which, on exposure to a plasma torch in a plasma torch device, generates electromagnetic radiation distinct from that of the plasma torch device component body. The distinct electromagnetic radiation generated is indicative of erosion of the monitorable plasma torch device component in the erosion zone. Such a monitorable plasma torch device component can facilitate effective component monitoring which allows for ameliorative action to be taken in the event that degradation of the device component is detected.

Abstract: A ground aeration device is described herein. The ground aeration device includes an air supply connector for receiving pressurised air from a source, a first supporting element for supporting a drill element for insertion into the ground, and a hydraulic hammer means. The drill element includes a cavity operably connected to an aperture a pneumatic means operably connected to the air supply comprising an actuating means for controlling supply of pressurised air through the drill element. The pneumatic means is arranged on the first supporting element. The aeration device further comprises a second supporting element, slidably attached to the first supporting element. A hydraulic means is attached to the first and second supporting elements. The first supporting element being movable via the hydraulic means from an initial parked position to a first position relative to the second supporting element.

Abstract: There is provided an ear cup including a housing containing a filter assembly and a motor-driven impeller for creating an airflow through the filter assembly, the housing including an air outlet downstream from the filter assembly for emitting the filtered airflow from the housing. The ear cup further includes an acoustic driver carried by the housing, a reference internal noise sensor carried by the housing, and active noise control circuitry that is configured to use a signal provided by the reference internal noise sensor to operate the acoustic driver.

Abstract: There is provided an ear cup including a housing containing a filter assembly and a motor-driven impeller for creating an airflow through the filter assembly, the housing including an air outlet downstream from the filter assembly for emitting the filtered airflow from the housing. The ear cup further includes an acoustic driver carried by or mounted to, either directly or indirectly, the housing, a reference internal noise sensor disposed within the housing, and a reference ambient noise sensor carried by or mounted to, either directly or indirectly, the housing. The ear cup further includes active noise control circuitry that is configured, in a first operating state, to use a signal provided by the reference internal noise sensor to operate the acoustic driver and, in a second operating state, to use a signal provided by the reference ambient noise sensor to operate the acoustic driver.

Abstract: There is provided an ear cup including a housing containing a filter assembly and a motor-driven impeller for creating an airflow through the filter assembly, the housing including an air outlet downstream from the filter assembly for emitting the filtered airflow from the housing. The ear cup further includes an acoustic driver mounted to the housing, a reference internal noise disposed within the housing and a reference ambient noise mounted to the housing. The ear cup further includes active noise control circuitry that is configured to simultaneously use both a signal provided by the reference internal noise and the signal provided by the reference ambient noise to operate the acoustic driver.

Abstract: There is provided an ear cup comprising a housing, an ear pad attached to the housing and arranged such that the housing and the ear pad together define a cavity having an opening, and an acoustic driver disposed within the cavity. The ear cup further comprises a feedforward microphone, a feedback microphone, and active noise control (ANC) circuitry. The active noise control (ANC) circuitry is configured to use a feedforward signal provided by the feedforward microphone to operate the acoustic driver to attenuate noise having frequencies within a feedforward ANC range having a lower limit of no less than 300 Hz and an upper limit of more than 1.5 kHz and to use a feedback signal provided by the feedback microphone to operate the acoustic driver to attenuate noise having frequencies within a feedback ANC range having an upper limit of no more than 1.5 kHz.

Abstract: Systems and methods for providing data exploration techniques are provided. For instance, user inputs specifying one or more data parameters can be received. One or more data sets can be obtained from a data source based at least in part on the data parameters. The data can be grouped into one or more groupings based at least in part on the data parameters. Each data grouping can have a plurality of subsets. A distribution of data can be determined for each data subset. A plurality of data representations can be generated based at least in part on the data parameters and the distributions of data. The distributions of data for each data subset can then be compared. One or more suggested applications or at least one data subset can be determined based at least in part on the comparison.

Abstract: According to one implementation of the present disclosure, a memory array to block read-access of uninitialized memory locations is disclosed. The memory array includes: a plurality of memory cells apportioned into a plurality of memory columns and a plurality of memory rows, where each of the memory cells is configured to store a single bit of memory data; and one or more initialization columns corresponding to at least one of the plurality of memory columns. The initialization state of a memory row of the memory cells may be configured to be stored in: the memory row; a latch of word-line driver circuitry coupled to the memory array; or a memory cell of the one or more initialization columns of a corresponding row of the plurality of memory rows of the memory array.

Abstract: There is provided a head wearable air purifier comprising a first speaker assembly and a second speaker assembly, wherein the first speaker assembly comprises a filter assembly, an impeller for creating an airflow through the filter assembly, a motor arranged to drive the impeller and an air outlet downstream from the filter assembly for emitting a filtered airflow from the first speaker assembly. The head wearable air purifier further comprises a nozzle arranged to receive the filtered airflow from the first speaker assembly, the nozzle comprising an air outlet arranged to emit the received filtered airflow from the head wearable air purifier. The impeller is a mixed flow impeller that has a generally conical or frusto-conical shape, and both the impeller and the motor are disposed within an impeller casing that is generally frusto-conical in shape.

Abstract: There is provided a head wearable air purifier comprising a first speaker assembly and a second speaker assembly, wherein the first speaker assembly comprises a filter assembly, a motor-driven impeller for creating an airflow through the filter assembly, and an air outlet downstream from the filter assembly for emitting a filtered airflow from the speaker assembly. The head wearable air purifier further comprises a nozzle arranged to receive the filtered airflow from the first speaker assembly, the nozzle comprising an air outlet arranged to emit the received filtered airflow from the head wearable air purifier, and a control circuit arranged to control a rotational speed of the motor-driven impeller of the first speaker assembly such that the maximum rotational speed of the motor-driven impeller is from 9000 to 18,000 RPM.

Abstract: A method for fabricating a component of an abatement apparatus is disclosed. The method comprises: meshing a 3D model representation of a component defining a reaction chamber of an abatement apparatus based on specified component characteristics to define an optimised finite element representation of the component; and fabricating the optimised finite element representation. In this way, a 3D model of a component of an abatement apparatus can be generated from which its performance can be modelled. Particular characteristics of the component may be defined which affect the operation of the abatement apparatus. Those characteristics may then be used to generate the optimized finite element representation of the component which has those characteristics using meshing (it will be appreciated that meshing is the operation of representing a geometric object as a set of finite elements).