Group online communication and collaboration has become part of people's daily life. Therefore, it is critical to provide a meeting initiator to efficiently present his/her information, and control his/her presented information. It is also critical for the speed and efficiently to process the meeting initiator's requests for his/her presented information to be quickly reaching to other meeting participants during a meeting. This invention facilitates a unique user interface (UI) for the meeting initiator to efficiently present information and to control presented information through a unique withdrawing (un-post) operation. Specially, this invention deploys dynamic workspaces technology together with post and un-post (withdraw) operations that greatly improves the speed and efficiency for processing the meeting initiator's requests and for monetizing the meeting activities.

The virtual presentation technology in this invention can significantly reduce data load on a network and thus reduce the network bandwidth requirement. This allows serving more requests for data transaction over a network with fixed network bandwidth. In addition, with traditional Internet file sharing products, e.g. the then-existed Yahoo Group online service, in order to stop sharing a file, the file must be physically deleted that prevents resharing the file unless expensively recreating them. In addition, traditional email and instant message does not allow a user to delete a previously posted or shared message from a UI of a recipient. Therefore, the user could be embarrassed if the posted message is not proper to the recipient. This invention has overcome the problems to allow user instantly deleting posted information of file or folder from recipient's UI without physically deleting the file, and deleting previously posted messages from recipient's UI.

The virtual presentation technology in this invention can significantly reduce data load on a network and thus reduce the network bandwidth requirement. This allows serving more requests for data transaction over a network with fixed network bandwidth. In addition, with traditional Internet file sharing products, e.g. the then-existed Yahoo Group online service, in order to stop sharing a file, the file must be physically deleted that prevents resharing the file unless expensively recreating them. In addition, traditional email and instant message does not allow a user to delete a previously posted or shared message from a UI of a recipient. Therefore, the user could be embarrassed if the posted message is not proper to the recipient. This invention has overcome the problems to allow user instantly deleting posted information of file or folder from recipient's UI without physically deleting the file, and deleting previously posted messages from recipient's UI.

A system and method for handling slag in a slag pit includes an equilibrium or balance crane equipped with a quick connect coupling. A drop-ball fixture and drop-ball reduces the size of the slag, as needed, then the boom assembly of the crane releases the drop-ball fixture and engages an excavating tool, such as a clamshell bucket, a bucket, or a grapple. An elevated control station provides an operator with improved line-of-sight visibility.

A system and method for handling slag in a slag pit includes an equilibrium or balance crane equipped with a quick connect coupling. A drop-ball fixture and drop-ball reduces the size of the slag, as needed, then the boom assembly of the crane releases the drop-ball fixture and engages an excavating tool, such as a clamshell bucket, a bucket, or a grapple. An elevated control station provides an operator with improved line-of-sight visibility.

A roller circle assembly for heavy machinery includes an upper circular rail and a lower circular rail concentrically arranged about a central axis, and tapered rollers between the upper and lower rail. Each tapered roller includes a flange having an angled and convex flange contact surface that contacts the lower rail. The lower rail and/or the upper rail can include an angled surface configured for contact with the flange contact surface. The geometry of the rollers and the lower rail are configured to reduce the stresses applied to the rollers and lower rail due to contact between the flange contact surface and the angled surface.

A roller circle assembly for heavy machinery includes an upper circular rail and a lower circular rail concentrically arranged about a central axis, and tapered rollers between the upper and lower rail. Each tapered roller includes a flange having an angled and convex flange contact surface that contacts the lower rail. The lower rail and/or the upper rail can include an angled surface configured for contact with the flange contact surface. The geometry of the rollers and the lower rail are configured to reduce the stresses applied to the rollers and lower rail due to contact between the flange contact surface and the angled surface.

A hydraulic valve block configured to specifically control an operation of a clam actuator of a face shovel bucket of a face shovel machine is disclosed. The hydraulic valve block comprises a first inlet, a second inlet, a first outlet connected to the first inlet via a first line and a second outlet connected to the second inlet via a second line. The hydraulic valve block further comprises a two port two position directional control valve interconnected between the first line and the second line, a first pressure relief valve interconnected between the first line and the second line and arranged in series with the two port two position directional control valve, and a second pressure relief valve interconnected between the first line and the second line and arranged in parallel to the first pressure relief valve and the two port two position directional control valve.

An apparatus, system, and method of loading of a compartmented dry-bulk-cargo barge in an efficient, safe, load-balanced, and environmentally responsible way, minimizing exposure to the elements, spillage, and spread of dust particles from the dry-bulk materials, through existing small hatch openings in barge compartment covers, without removing barge compartment covers, using an articulated arrangement of connected conveyers with rotating and telescoping capabilities, providing rapid change of position and precise positioning with minimal movement of the compartmented dry-hulk-cargo barge.

A clamp assembly comprising a pair of clamps may couple to an assembly body. The clamps may pivot to receive material beneath the assembly body. The clamps may include opposing surfaces that define a scoop space beneath the assembly body. Each of the clamps may include a cutting plate. The cutting plate may include a perforating edge configured to extend into the scoop space relative to a corresponding one of the opposing surfaces. The clamp may further include a retention plate. The retention plate may include an inner surface that faces the cutting plate. The cutting plate and the retention plate further define the scoop space between the clamps. The clamp assembly may couple to a lift assembly. The lift assembly may include a hydraulic actuator configured to raise and lower the clamp assembly.