Abstract: Configurations for providing a data feed of contact information updates, deletes, and additions to one or more clients are disclosed. A contact information server can maintain a log including respective log entries of different updates (e.g., in a log structure data store) performed on the contact information. The contact information server orders the log entries using associated timestamps in order to be consistent with the actual order of updates performed on the contact information. For synchronizing contact information, a client will submit a query and supply a timestamp to the contact information server to request the log of updates based on the timestamp (e.g., log entries corresponding to a set of updates since the included timestamp). The server will respond with one or more modifications to the contact information represented as the set of updates in respective log entries.

Abstract: Systems and methods for restricting a scope of a post are provided. In some aspects, a post for a first set of users is received from a first user. An indication of the post is provided to at least a portion of the first set of users. A request to further share the post with a third user is received from a second user within the first set of users. A maximum scope for the post is determined. If the third user is within the maximum scope for the post is determined. The indication of the post is not provided to the third user if the third user is not determined to be within the maximum scope for the post.

Abstract: Configurations for providing a data feed of contact information updates, deletes, and additions to one or more clients are disclosed. A contact information server can maintain a log including respective log entries of different updates (e.g., in a log structure data store) performed on the contact information. The contact information server orders the log entries using associated timestamps in order to be consistent with the actual order of updates performed on the contact information. For synchronizing contact information, a client will submit a query and supply a timestamp to the contact information server to request the log of updates based on the timestamp (e.g., log entries corresponding to a set of updates since the included timestamp). The server will respond with one or more modifications to the contact information represented as the set of updates in respective log entries.

Abstract: An X-Y gantry system is disclosed. The X-Y gantry system includes an X-axis element, a Y-axis element coupled to the X-axis element. An instrument is coupled to the Y-axis element. The Y-axis element includes a slider assembly with a slider and a guide support element coupled to the slider. The guide support element may have a flexible portion. The slider may or may not contact a slider bar in the system.

Abstract: Systems and methods for restricting a scope of a post are provided. In some aspects, a post for a first set of users is received from a first user. An indication of the post is provided to at least a portion of the first set of users. A request to further share the post with a third user is received from a second user within the first set of users. A maximum scope for the post is determined. If the third user is within the maximum scope for the post is determined. The indication of the post is not provided to the third user if the third user is not determined to be within the maximum scope for the post.

Abstract: In one aspect, a method includes receiving a request from a user to add one or more users or user groups to a communication session, determining if one or more access rights restrictions are associated with the session, the one or more access rights restrictions defining one or more users or one or more types of users authorized to join the session, determining if the one or more users or user groups are authorized to join the session according to the access rights restrictions when it is determined that one or more access rights restrictions are associated with the session and adding the one or more users or user groups to the session when it is determined that the one or more users or user groups are authorized to join the session. Other aspects can be embodied in corresponding systems and apparatus, including computer program products.

Abstract: A method and apparatus for horizon control in a mining operation where fresh product 3 is cut from a seam 1. The cutting exposes a fresh cut product face 25. The fresh cut product face 25 is observed at a position immediately adjacent a cutter 11. Any temperature contrast regions from an IR observation between an upper limit of observation and a lower limit of observation are noted. At least one height co-ordinate position of a temperature contrast region 33 is determined and an output signal provided of the determined height co-ordinate position so that the output signal can be used as a horizon datum for horizontal control.

Abstract: A method and apparatus is provided for determining structural change in a mining operation. A first scan of gateroad surfaces is obtained and information of the scan profile is stored. At a later time a second scan of the gateroad surfaces is then obtained. Information of the scans can be registered and any difference noted. If the difference exceeds a threshold a warning can be provided indicating a gateroad structural change that may be hazardous. The scans can be made from a single sensor, or from multiple sensors (301, 303). In the case where the sensors (301, 303) are mounted on a gateroad traversing structure (109), the distance of spacing of the sensors (301, 303) can be used to determine when the sensor (303) has reached a position of movement or travel of the gateroad traversing structure (109) where the scan from sensor (301) was made. A distance sensor (309) can be provided to determine the distance of movement and where the scans coincide.

Abstract: According to one embodiment, a voltage reference circuit operable with a low voltage supply comprises an op-amp powered by the low voltage supply and a feedback branch including a transistor driven by an output of the op-amp. The feedback branch couples the low voltage supply to ground through the transistor and at least a rectifying device situated between a reference node of the feedback branch and ground. An input of the op-amp is coupled to the reference node by a voltage divider. In one embodiment, the voltage reference circuit further comprises a reference branch coupling a second reference node to ground through at least a second rectifying device, and wherein a second input of the op-amp is coupled to the second reference node by a second voltage divider.

Abstract: A method and apparatus for horizon control in a mining operation is provided. Fresh product 3 is cut from a seam 1. The cutting exposes a fresh cut product face 25. The fresh cut product face 25 is observed at a position immediately adjacent a cutter 11. Any temperature contrast regions from an IR observation between an upper limit of observation and a lower limit of observation are noted. At least one height co-ordinate position of a temperature contrast region 33 is determined and an output signal provided of the determined height co-ordinate position so that the output signal can be used as a horizon datum for horizontal control.

Abstract: A method and apparatus is provided for determining structural change in a mining operation. A first scan of gateroad surfaces is obtained and information of the scan profile is stored. At a later time a second scan of the gateroad surfaces is then obtained. Information of the scans can be registered and any difference noted. If the difference exceeds a threshold a warning can be provided indicating a gateroad structural change that may be hazardous. The scans can be made from a single sensor, or from multiple sensors (301, 303). In the case where the sensors (301, 303) are mounted on a gateroad traversing structure (109), the distance of spacing of the sensors (301, 303) can be used to determine when the sensor (303) has reached a position of movement or travel of the gateroad traversing structure (109) where the scan from sensor (301) was made. A distance sensor (309) can be provided to determine the distance of movement and where the scans coincide.

Abstract: A system for selectively loading pipettes onto a multichannel pipettor using a pipette holder which projects the engagement ends of selected pipettes further away from a support surface compared with a remainder of pipettes retained in the holder.