In orthogonal time-frequency-space (OTFS) systems, when peak average power ratio (PAPR) is suppressed through companding operation, errors in the signal probability density function design cause noise in the compandin...
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This paper presents a permanent magnet discrete pole cluster adaptive manipulator. It describes the composition structure, analyzes the force distribution, conducts electromagnetic simulation of the push rod's wor...
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High density MCM(Multi Chip Module) design is the direction of microwave circuit and system. In the study of frequency transformation module,when both signals are input simultaneously, the off-band signal affects the ...
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The design, fabrication and characterization of a tip-tilt-piston (TTP) piezoelectric micromirror with a 1 mm2 optical aperture is presented. The TTP piezoelectric micromirror consists of four symmetrically distribute...
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Impellers are extensively employed across various industrial sectors and in different industrial systems, such as ducted-fan modules. The configuration of ducted-fan modules can be optimized to achieve high impeller p...
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We present details of the recent trade study on design changes to the Wide Field optical Spectrometer (WFOS) for the Thirty Meter Telescope (TMT)[1]. WFOS is planned as a first light instrument and will provide highly...
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ISBN:
(纸本)9781510675216;9781510675223
We present details of the recent trade study on design changes to the Wide Field optical Spectrometer (WFOS) for the Thirty Meter Telescope (TMT)[1]. WFOS is planned as a first light instrument and will provide highly efficient imaging and multi-slit spectroscopy over the wavelength range 0.31 to 1 mu m across a field of view of 8.3 by 3 arcminutes. The existing baseline prior to the trade study used a laser cut metal slit mask at the focal plane to enable observation of similar to 50 to 80 objects simultaneously. The masks would be cut in advance of observing and installed in a cassette, allowing a mechanism to select the mask and move it into place at the focal plane. Each multi-object observation requires a dedicated mask, with a more general single long slit mask remaining in the cassette permanently. The configurable slit unit (CSU) is an alternative approach, and a design that has previously been used in MOSFIRE and FORS. A CSU uses multiple knife edges mounted on computer-controlled bars to create and position slits at the focal plane. In the case of WFOS the CSU will be capable of creating 96 separate slits with the ability to reconfigure them on the fly to adapt to seeing conditions or to respond to targets of opportunity. We detail here the decision criteria, design, and science case analysis used by the WFOS team to decide to change the baseline design of WFOS to incorporate a CSU.
Currently, during the operation and maintenance of the power system, maintenance personnel often use large vehicle-mounted lifting and hoisting equipment to work at heights. However, this method has several issues, in...
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We demonstrate that plastic optical fibers incorporating fiber Bragg gratings can result in reflection peaks in any wavelength range when exciting high-order propagation modes. This can enhance the design of sensing s...
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We study nonlocal effects in distributed acoustic sensing due to the polarization dependence of the Rayleigh backscattering profile. The dependence of the phenomenon on the interrogating pulse width is characterized t...
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The performance of many cloud-based applications critically depends on the capacity of the underlying datacenter network. A particularly innovative approach to improve the throughput in datacenters is enabled by emerg...
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The performance of many cloud-based applications critically depends on the capacity of the underlying datacenter network. A particularly innovative approach to improve the throughput in datacenters is enabled by emerging optical technologies, which allow to dynamically adjust the physical network topology, both in an oblivious or demand-aware manner. However, such topology engineering, i.e., the operation and control of dynamic datacenter networks, is considered complex and currently comes with restrictions and overheads. We present Duo, a novel demand-aware reconfigurable rack-to-rack datacenter network design realized with a simple and efficient control plane. Duo is based on the well-known de Bruijn topology (implemented using a small number of optical circuit switches) and the key observation that this topology can be enhanced using dynamic ("opportunistic") links between its nodes. In contrast to previous systems, Duo has several desired features: i) It makes effective use of the network capacity by supporting integrated and multi-hop routing (paths that combine both static and dynamic links). ii) It uses a work-conserving queue scheduling which enables out-of-the-box TCP support. iii) Duo employs greedy routing that is implemented using standard IP longest prefix match with small forwarding tables. And iv) during topological reconfigurations, routing tables require only local updates, making this approach ideal for dynamic networks. We evaluate Duo in end-to-end packet-level simulations, comparing it to the state-of-the-art static and dynamic networks designs. We show that Duo provides higher throughput, shorter paths, lower flow completion times for high priority flows, and minimal packet reordering, all using existing network and transport layer protocols. We also report on a proof-of-concept implementation of Duo's control and data plane.
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