摘要:
Disclosed herein are technologies related to database calculation that utilizes parallel-computation of tasks in a directed acyclic graph. In accordance with one aspect, dependency of tasks is converted into a directed acyclic graph that topologically orders the tasks into layers of tasks. A database calculation may be performed, wherein the database calculation computes in parallel the tasks in each layer of the layers of tasks.
摘要:
A UPM system may include a session manager module to establish interface sessions with a policy enforcement point (PEP) and a policy decision point (PDP). A notification manager module forward event information received from the PEP to the PDP and receive a policy decision from the PDP. A policy engine may determine, based on the event information, whether to forward the policy decision to the PEP, to ignore the policy decision or to modify the policy decision.
摘要:
Disclosed herein are technologies related to database calculation that utilizes parallel-computation of tasks in a directed acyclic graph. In accordance with one aspect, dependency of tasks is converted into a directed acyclic graph that topologically orders the tasks into layers of tasks. A database calculation may be performed, wherein the database calculation computes in parallel the tasks in each layer of the layers of tasks.
摘要:
A thin vacuum valve for particle accelerator beam lines comprising of a frame, a slide, a shaft, a first clamp, and preferably a second clamp, which is easily constructed from highly electrically conductive material and presents substantially smooth, flat surfaces towards adjacent particle accelerator component. The frame has first and second surfaces respectively facing toward the two adjacent particle accelerator system components, the first surface including a slide slot. A frame orifice extends through the frame between the first and second surfaces, preferably at the slide slot, and is positioned and sized on the frame to permit passage of a particle beam generated by the particle accelerator system along a beam line The slide is housed substantially within the slide slot and is movable between a first position and a second position along a slide axis. In the first position, the slide permits a particle beam to pass through the slide orifice and through the frame orifice along the beam line. In the second position, the slide prevents a particle beam from passing through the frame via the frame aperture. The inner sealing surface of the slide engages the slot surface of the frame when the slide is in the second position, thereby substantially vacuum sealing the frame orifice. Translation of the shaft, which extends from the slide toward the periphery of the frame, selectively controls the movement of the slide between the first and second positions. The first and second clamps engage the slide and maintains the slide substantially within the slide slot. In one embodiment, detents extending from the first and second clamps engage corresponding detents extending from the slide when the slide is in the second position, and thereby bias the slide toward the frame orifice to substantially seal the frame orifice. The frame of the valve may also be incorporated within an end plate of a particle accelerator component.
摘要:
A drift tube linear accelerator (DTL) incorporating an improved drift tube design, wherein the DTL comprises a resonance chamber maintaining a vacuum and having an inlet port and an exit port, an RF field source producing an oscillating radio frequency field within the chamber, and a plurality of substantially cylindrical drift tubes comprising a hollow body having a low energy end and a high energy end and housing a magnet, a low energy end cap attached to the low energy end of the hollow body and a high energy end cap attached to the high energy end of the hollow body, and a stem extending from said hollow body to an inner surface of the resonance chamber.