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This paper presents a model aimed at calculating the peak power generated by an axial Virtual Cathode Oscillators. The model combines the Larmor's Formula and one-dimensional computational simulations in order to obtain the value of the charge accumulated in the virtual cathode and its acceleration. The proposed model coincides with experimental results reported in the literature.
In the outer space down to the altitudes routinely flown by the larger commercial aircrafts, radiation is a serious problem for the microelectronics circuits. The 88-Inch Cyclotron at Lawrence Berkeley National Laboratory is a sector-focused cyclotron and is the home of the Berkeley Accelerator Space Effects Facility, where the effects of energetic particles on sensitive microelectronics are studied...
We demonstrate a graphene-alumina-graphene heterostructured semiconductor chip, on which THz plasmons are generated via backward phase-matched 2nd nonlinearity all-optically. The on-chip plasmons are effectively gate tunable, with photon-efficiency ∼10−4, and Q factor > 60.
The safety operation of the Airport Tower controllers requires a clear vision of the airplane during departure and approaching process. It is costly and time consuming to conduct field visual conspicuity tests in the airport. It may also interfere with the job of controllers and the schedules of the operation of the airport. Last but not least, in the field test, researchers can only measure the current...
-This paper proposes a game theoretic scheduling model for reducing service cost in home health care. We focus on a setting where a group of independent health care practitioners need to be assigned to home visits within a time window. The practitioners have different skill sets, time constraints and client preferences. They also expect reasonable payments given their skill levels and cost incurred...
The design and development of aerospace product is a collaborative multi-discipline project. The integrated and consistent information modeling of all the information, models, documents and other product data generated during design and development is critical to success. An integrated information model, defined as EDPS (Engineering Digital Prototyping for Satellite) is proposed. Aiming at modeling...
The management of the magnanimous spatial data needs the distributed cooperative GIS platform. This paper proposed the Peer To Peer and Cooperating Computing Hybrid Discovering Model of Distributed Geospatial Information. Based on the (Spatial Resource Discovery Agent (SRDA) and ordinary neighbor node, Combined with Spatial data model of MAPGIS7.0, this article brings up the geographic structure query...
Trust mechanism is a crucial part of the P2P applications, which limits their rapid development. Unfortunately, current mechanisms were unable to detect the malicious peers accurately under the disturbing of various malicious reports. This paper proposes a new trust model, named Similarity Transitivity chain based Trust Model (STTM), to evaluate peers' global trust more precisely. Firstly, we employ...
Compared with L type filters, used in the AC side of voltage source PWM converters (VSC), the third-order LCL filters can suppress the switching frequency current ripples more effectively. However, the underdamped characteristics of LCL filters will bring control system stability problems. In order to assure stable operation of VSC control system, a novel active damping control strategy based on feedforward...
A prototype of an analog, transverse feedback system for damping of the two-stream (e-p) instability has been developed and successfully tested at the Los Alamos Proton Storage Ring (PSR). This paper describes the system configuration, results of several experimental tests and studies of system optimization along with studies of the factors limiting its performance.
This paper analyzes the stator flux oriented vector control theory for doubly fed induction generator, control strategy of no-load cutting-in based on grid voltage feedback and control strategy of grid connected based on speed feedback are used in this system, the arithmetic of maximum power point tracking independent of the turbine characteristics and air density is used in this system. The results...
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