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: A method of operating a computer aided design (CAD) system model for modelling an article to be manufactured includes receiving a representation of the article, receiving constraints for the article, determining a maximum permissible curvature of one or more parts of the article, measuring the maximum curvature of the one or more parts of the article in the received representation and comparing the measured maximum curvature with the maximum permissible curvature. If the measured maximum curvature of at least one of the one or more parts exceeds the determined maximum permissible curvature, an error indication is provided. If the measured maximum curvature of each of the one or more parts does not exceed the determined maximum permissible curvature, the received representation for the article is stored.

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 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 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: Avalanche photodetector devices and methods of use thereof are provided that incorporate deep levels to increase secondary carrier generation via impact ionization under application of a reverse bias. An avalanche photodetector device may include p+ and n+ regions, an intermediate semiconductor absorption region provided therebetween, and at least one semiconductor region residing between the p+ and n+ regions that incorporates deep levels. When light is incident on the device such that the absorption depth of the light extends into the intermediate semiconductor absorption region, a photocurrent is produced under a reverse bias includes both photocarriers generated within the intermediate semiconductor absorption region and secondary carriers released from the deep levels via impact ionization.

Abstract: Avalanche photodetector devices are disclosed in which spatial asymmetry is employed to preferentially enhance avalanche multiplication of electrons. In some example embodiments, an avalanche photodetector device includes p-doped and n-doped regions and a central waveguide region, where the p-doped region is laterally offset from the central waveguide by a first lateral offset region, and where the n-doped region is laterally offset from the central waveguide by a second lateral offset region. The first and second lateral offset regions are asymmetrically defined such that impact ionization and avalanche multiplication of electrons in the second laterally offset region is enhanced relative to that of holes in the first laterally offset region. In some example implementations, the asymmetry may be provided by a difference in relative heights and/or lateral spatial extends (widths) of the lateral offset regions, such that the electric field, or a spatial extent associated therewith, is enhanced for electrons.

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).

Abstract: An impact detection system is disclosed for detecting and identifying an object colliding with a vehicle. The impact detection system comprises a sensor arrangement arranged to measure a characteristic of an impact of the object against the vehicle, a trigger determiner associated with the sensor arrangement for determining whether the characteristic of the 5 impact is greater than a predefined threshold value, and an image capturing device arranged to capture an image of the object. The system is arranged to automatically make the captured image available for inspection in response to the trigger determiner determining that the characteristic of the impact is greater than the predefined threshold value so that the object in the image can be identified substantially in real-time.

Abstract: A well abandonment tool comprising an elongate housing extending between top and bottom ends locatable within a wellbore having a longitudinal pumping cylindrical bore therein. The apparatus further comprises a wellbore seal located around the housing operable to engage upon the wellbore and to be expanded into contact therewith upon an upward motion of the housing so as to seal an annulus between the housing and the wellbore and a bridge plug engagement connector adapted to secure a bridge plug thereto at a position below the bottom end of the housing. The apparatus further includes a pumping piston longitudinally moveably located within the pumping cylinder, the pumping piston being suspended from a wireline wherein longitudinal movement of the pumping piston discharges a fluid into a bridge plug activation chamber having a movable cylinder adapted to draw the bridge plug engagement connector against the bottom end of the housing so as to expand the bridge plug into engagement with the wellbore.

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: A method of operating a computer aided design (CAD) system model for modelling an article to be manufactured includes receiving a representation of the article, receiving constraints for the article, determining a maximum permissible curvature of one or more parts of the article, measuring the maximum curvature of the one or more parts of the article in the received representation and comparing the measured maximum curvature with the maximum permissible curvature. If the measured maximum curvature of at least one of the one or more parts exceeds the determined maximum permissible curvature, an error indication is provided. If the measured maximum curvature of each of the one or more parts does not exceed the determined maximum permissible curvature, the received representation for the article is stored.

Abstract: A well abandonment tool comprising an elongate housing extending between top and bottom ends locatable within a wellbore having a longitudinal pumping cylindrical bore with a pumping piston therein. The apparatus further comprises a wellbore seal located around the housing operable to engage upon the wellbore and to be expanded into contact therewith upon an upward motion of the housing so as to seal an annulus between the housing and the wellbore and a bridge plug engagement connector adapted to secure a bridge plug thereto at a position below the bottom end of the housing. The pumping piston is suspended from a wireline wherein longitudinal movement of the pumping piston discharges a fluid into a bridge plug activation chamber having a movable cylinder adapted to draw the bridge plug engagement connector against the bottom end of the housing so as to expand the bridge plug into engagement with the wellbore.

Abstract: Briefly, embodiments of claimed subject matter relate to adjusting, such as extending, a clock signal to permit completion of a write operations to a first memory type and/or to permit completion of read operations from a second memory type, wherein the first memory type and the second memory type are dissimilar from each other. In certain embodiments, the first memory type may comprise a magnetic random-access memory (MRAM) cell array, and the second memory type may comprise a static random-access memory (SRAM) cell array.

Abstract: Various implementations described herein are directed to a device having a voltage regulator that uses a modulator to adjust an output voltage. The device may include a time-to-digital converter that measures a timing delay of a logic chain, compares the timing delay to a reference delay to determine a timing delay error, and provides the timing delay error to the modulator for adjusting the output voltage.