Abstract: A sensor transportation apparatus for conveying a sensor assembly through a wellbore comprises at least one engagement structure to connect the sensor transportation apparatus to the sensor assembly, at least one axle, a bearing connected to the axle, and a wheel connected to the bearing and provided with a shaft seal to prevent or reduce debris from the wellbore entering the bearing, and a lubrication delivery system to provide a lubricant to the bearing at a pressure which is greater than ambient wellbore pressure. The lubrication system comprises a bellows formation, and the apparatus comprises a housing to contain the lubricant, the housing in fluid communication with the bearing, the bellows formation sealingly mounted to the housing with at least a portion of the bellows received within the housing.

Abstract: There is provided a gasket comprising a rigid core (2) defining an aperture (4). The core has a serrated profile (8) on at least one of its upper and lower outer surfaces and the core is divided into upper and lower parts (2a, 2b) each having a respective outer surface (6a, 6b) and also an inner surface (42, 44) opposite the outer surface. The gasket also includes an optional sealing facing (12, 14) on the at least one outer serrated profile surface, wherein an inner insulating layer (40) is located between the said upper and lower parts so that it is operable to substantially reduce electrical conduction between the said upper and lower parts. There is described a method of production of the gasket and use of the gasket.

Abstract: In a method for tracking change data, data is changed in a field of a plurality of data in a database at a computer system, where the plurality of data is included within a base table of the database, the base table including an original state of the plurality of data, where changing the data changes a record header for the field within a change data table of the database, where the change data table includes changes made to the base table. A flag is created in the record header of the data signaling the change to the field within the change data table. Successive versions of the database are linked together such that a subscriber accessing the database can automatically view a current version of the database with the change by accessing the record header of the data and identifying the flag within the record header of the data.

Abstract: A sensor transportation apparatus comprises at least one engagement structure to connect the sensor transportation apparatus to the sensor assembly, a pair of wheels arranged to rotate about an axis of rotation substantially perpendicular to a longitudinal axis of the sensor assembly when the transportation apparatus is connected to the sensor assembly, and an orientation structure comprising the pair of wheels and an orientation projection extending between the pair of wheels. Lateral extremities of the pair of wheels and the orientation projection together define a curve extending circumferentially around a portion of the circumference of the elongate sensor assembly. A rotational centre of the curve is offset from a central axis of the elongate sensor assembly and a rotational axis of the pair of wheels is above the central axis of the elongate sensor assembly when the sensor transportation apparatus is substantially horizontal.

Abstract: A sensor transportation apparatus comprises at least one engagement structure to connect the sensor transportation apparatus to the sensor assembly, a pair of wheels arranged to rotate about an axis of rotation substantially perpendicular to a longitudinal axis of the sensor assembly when the transportation apparatus is connected to the sensor assembly, and an orientation structure comprising the pair of wheels and an orientation projection extending between the pair of wheels. Lateral extremities of the pair of wheels and the orientation projection together define a curve extending circumferentially around a portion of the circumference of the elongate sensor assembly. A rotational centre of the curve is offset from a central axis of the elongate sensor assembly and a rotational axis of the pair of wheels is above the central axis of the elongate sensor assembly when the sensor transportation apparatus is substantially horizontal.

Abstract: The present disclosure relates to near-end crosstalk (NEXT) cancellation. A transmit communication signal is transmitted over a first Digital Subscriber Line (DSL) connection using a first group of frequencies and a receive communication signal is received over a second DSL connection using a second group of frequencies that at least partially overlaps the first group of frequencies. A crosstalk correlation between the first and second communication signals is determined. Based on the crosstalk correlation, a crosstalk cancellation signal is generated. The crosstalk cancellation signal is subtracted from the second communication signal, with the intention of reducing NEXT.

Abstract: A device for transporting a sensor assembly in a bore comprises a plurality of wheels azimuthally spaced apart around a longitudinal axis of the device. Each wheel presents a radial extremity of the device. The wheels are moveably supported to move between a minimum outer diameter of the device and a maximum outer diameter of the device. An adjustable stop mechanism is configured to pre-set the maximum outer diameter of the device within a range of maximum outer diameters so that the device is configurable for use in a pre-determined range of bore diameters. One or more spring elements bias the wheels radially outwards and are preloaded to provide a radial force to the wheels when at the pre-set maximum outer diameter.

Abstract: Distal tips for use with delivery catheters are disclosed that are configured to maintain complete engagement between the distal tip and a distal opening of a sheath component of the delivery catheter so as to prevent separation therebetween and/or to prevent fish-mouthing of a distal leading edge of the sheath component during in vivo use. Distal tips so configured realize one or more of the objectives of safer tracking of the delivery catheter through the vasculature, safe crossing of the delivery catheter through structural components of the vasculature and heart, such as through native valves, and safe removal of the delivery catheter post deployment.

Abstract: A device for centering a sensor assembly in a bore comprises a mandrel, a first support member and a second support member axially spaced apart along a longitudinal axis of the mandrel. The first and second support members adapted to move axially along the mandrel. A plurality of arm assemblies are spaced circumferentially apart around the longitudinal axis of the device and connected between the first and second support members. Each arm assembly comprises a first arm pivotally connected to the first support member by a first pivot joint having a first pivot axis, a second arm pivotally connected to the second support member by a second pivot joint having a second pivot axis, and the first and second arms pivotally connected together via a third pivot joint having a third pivot axis.

Abstract: A device for centering a sensor assembly in a bore comprises a first support member and a second support member axially spaced apart along a longitudinal axis of the device, and a plurality of arm assemblies connected between the first and second support members. Each arm assembly comprises a first arm pivotally connected to the first support member by a first pivot joint having a first pivot axis, a second arm pivotally connected to the second support member by a second pivot joint having a second pivot axis, a third arm connected between the first and second arms, the third arm pivotally connected to the first arm by a third pivot joint having a third pivot axis, and the third arm pivotally connected to the second arm by a fourth pivot joint having a fourth pivot axis.

Abstract: Embodiments redirect data from a source to a plurality of deduplication blockpools. In one embodiment, operations include accessing a binary large object (BLOB) that includes a plurality of blocklets, a blocklet having a hash value; upon determining that the plurality of blocklets includes less than a threshold number of blocklets: selecting, according to a first rule set, a target blockpool from among the plurality of deduplication blockpools; upon determining that the plurality of blocklets includes at least the threshold number of blocklets: selecting, according to a second, different rule set, a target blockpool. The second rule set includes a BalanceQuery rule that computes a fitness value for a member of the plurality of deduplication blockpools, and selects a target blockpool based, at least in part, on the fitness value. Embodiments provide the BLOB to the target blockpool.

Abstract: There is provided a method of classifying a biological status of an individual. The method comprising: obtaining a biological sample from a patient; obtaining health-related information from the patient, said information including patient gender; analysing the sample to identify a quantity of each of 2 or more endogenous analytes in the sample; comparing the analyte quantities to reference data from healthy individuals to classify the patient as healthy, pre-diseased, at risk of disease or diseased for at least one health-related condition. The reference data includes data derived from a group of biological samples of individuals having the same gender as the patient and not having a need for medical treatment for a disease or illness, each biological sample of the group of biological samples having been analysed by the same process as used to analyse the patient sample, the process being monitored to maintain a predetermined level of consistency.

Abstract: A fluidic card assembly comprising a fluidic card housing (1) and a biochip (3) located in the fluidic card housing. The fluidic card housing (1) includes a chamber (2) with a base wall, into which at least one fluidic channel extends. The biochip (3) is at least partially located in the chamber. A seal (7) is provided for sealing the biochip in the chamber (2) when the biochip is urged into the chamber. The fluidic channel has a serpentine form.

Abstract: A guide device for a tool string to guide the tool string down a wellbore, the guide device comprising: a coupling to connect the guide device to an end of a tool string, a mandrel and a tip at a leading end of the mandrel, a centralising device supported by the mandrel, and a joint (a flexible joint or articulation joint) between the mandrel and the coupling allowing angular displacement of the mandrel relative to the tool string so that the tip can displace from a longitudinal axis of the tool string.

Abstract: A sensor transportation apparatus for conveying a sensor assembly through a wellbore comprises at least one engagement structure to connect the sensor transportation apparatus to the sensor assembly, at least one axle, a bearing connected to the axle, and a wheel connected to the bearing and provided with a shaft seal to prevent or reduce debris from the wellbore entering the bearing, and a lubrication delivery system to provide a lubricant to the bearing at a pressure which is greater than ambient wellbore pressure. The lubrication system comprises a bellows formation, and the apparatus comprises a housing to contain the lubricant, the housing in fluid communication with the bearing, the bellows formation sealingly mounted to the housing with at least a portion of the bellows received within the housing.

Abstract: The disclosure relates to a carriage apparatus for carrying a tool string down a wellbore in a wireline logging, and an orientation apparatus and hole finder device for a wireline logging tool string. In some embodiments the carriage includes a protection structure which extends longitudinally around a wheel of the apparatus to thereby prevent a side of the wheel from contacting a wall of the wellbore. In some embodiments an orientation apparatus and hole finder are arranged so that the orientation apparatus orientates the hole finder device in the wellbore so that a tip of a nose section of the hole finder is elevated above a low side of the wellbore by a height and offset from and above a longitudinal axis of the tool string.

Abstract: A measurement probe is described that includes a probe body, a stylus that is deflectable relative to the probe body, and a plurality of sensor elements for generating a sensor signal indicative of stylus deflection. An analyser is provided, optionally as part of a trigger unit, to analyse the sensor signals and issues a trigger signal to indicate the stylus has contacted an object. The analyser is arranged to combine a plurality of the sensor signals to generate a resultant deflection signal for comparison to a deflection threshold and is also arranged to detect oscillatory motion of the stylus by analysing at least one of the sensor signals. The analyser only issues a trigger signal when the resultant deflection signal crosses the deflection threshold and no oscillatory motion of the stylus is detected. The measurement probe may be used on a machine tool or other coordinate positioning apparatus.

Abstract: The present disclosure relates to near-end crosstalk (NEXT) cancellation. A transmit communication signal is transmitted over a first Digital Subscriber Line (DSL) connection using a first group of frequencies and a receive communication signal is received over a second DSL connection using a second group of frequencies that at least partially overlaps the first group of frequencies. A crosstalk correlation between the first and second communication signals is determined. Based on the crosstalk correlation, a crosstalk cancellation signal is generated. The crosstalk cancellation signal is subtracted from the second communication signal, with the intention of reducing NEXT.

Abstract: Bonded surfaces are formed by adhering first nanorods and second nanorods to respective first and second surfaces. The first shell is formed on the first nanorods and the second shell is formed on the second nanorods, wherein at least one of the first nanorods and second nanorods, and the first shell and the second shell are formed of distinct metals. The surfaces are then exposed to at least one condition that causes the distinct metals to form an alloy, such as eutectic alloy having a melting point below the temperature at which the alloy is formed, thereby bonding the surfaces upon which solidification of the alloy.

Abstract: A method is for communicating by tracking time varying channels in a multiple access packet based communication network. Each packet includes a preamble portion including a data symbol, and a data portion including data symbols. The method may include initializing a channel estimate reference from an initial channel estimate based upon the data symbol in a preamble portion of a received packet, and updating the channel estimate reference based upon a channel estimate of a current data symbol and a previously received data symbol from the data symbols in a data portion of the received packet. The method may also include repeating the updating upon receipt of a subsequent data symbol from the data symbols in the data portion of the received packet.