2,127 research outputs found
Aeroelastic loads prediction for an arrow wing. Task 1: Evaluation of R. P. White's method
The separated flow method is evaluated. This method was developed for moderately swept wings with multiple, constant strength vortex systems. The flow on the highly swept wing used in this evaluation is characterized by a single vortex system of continuously varying strength
Power loss in open cavity diodes and a modified Child Langmuir Law
Diodes used in most high power devices are inherently open. It is shown that
under such circumstances, there is a loss of electromagnetic radiation leading
to a lower critical current as compared to closed diodes. The power loss can be
incorporated in the standard Child-Langmuir framework by introducing an
effective potential. The modified Child-Langmuir law can be used to predict the
maximum power loss for a given plate separation and potential difference as
well as the maximum transmitted current for this power loss. The effectiveness
of the theory is tested numerically.Comment: revtex4, 11 figure
Promoting fairness in Sheffield
In the light of growing inequalities, several urban areas in the UK established Fairness
Commissions between 2010 and 2013. In one of these areas, Sheffield, there was an attempt
to do something different and innovative. Sheffield on average was, and remains one of the least
deprived major cities in England, but also one of the most unequal. Following the publication of
the Commission’s report which included an analysis of evidence and 90 recommendations,
Sheffield responded by pursuing a number of city-wide initiatives involving different stakeholders.
These included monitoring progress towards a fairer city, action on the living wage, a city-wide
campaign to promote Sheffield as the fairest city, and ‘Sheffield Money’ to provide support for
those households facing financial exclusion. The continuation of austerity measures still creates
severe challenges to the ambitions and work of the Sheffield Fairness Commission, but
experiences have shown how leadership through example and the co-production of an active
campaign can give articulation to a shared desire to address injustices in the city
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User`s guide for SDDS toolkit Version 1.4
The Self Describing Data Sets (SDDS) file protocol is the basis for a powerful and expanding toolkit of over 40 generic programs. These programs are used for simulation postprocessing, graphics, data preparation, program interfacing, and experimental data analysis. This document describes Version 1.4 of the SDDS commandline toolkit. Those wishing to write programs using SDDS should consult the Application Programmer`s Guide for SDDS Version 1.4. The first section of the present document is shared with this reference. This document does not describe SDDS-compliant EPICS applications, of which there are presently 25
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The procedure execution manager and its application to Advanced Photon Source operation
The Procedure Execution Manager (PEM) combines a complete scripting environment for coding accelerator operation procedures with a manager application for executing and monitoring the procedures. PEM is based on Tcl/Tk, a supporting widget library, and the dp-tcl extension for distributed processing. The scripting environment provides support for distributed, parallel execution of procedures along with join and abort operations. Nesting of procedures is supported, permitting the same code to run as a top-level procedure under operator control or as a subroutine under control of another procedure. The manager application allows an operator to execute one or more procedures in automatic, semi-automatic, or manual modes. It also provides a standard way for operators to interact with procedures. A number of successful applications of PEM to accelerator operations have been made to date. These include start-up, shutdown, and other control of the positron accumulator ring (PAR), low-energy transport (LET) lines, and the booster rf systems. The PAR/LET procedures make nested use of PEM`s ability to run parallel procedures. There are also a number of procedures to guide and assist tune-up operations, to make accelerator physics measurements, and to diagnose equipment. Because of the success of the existing procedures, expanded use of PEM is planned
Connecting N-representability to Weyl's problem: The one particle density matrix for N = 3 and R = 6
An analytic proof is given of the necessity of the Borland-Dennis conditions
for 3-representability of a one particle density matrix with rank 6. This may
shed some light on Klyachko's recent use of Schubert calculus to find general
conditions for N-representability
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