1,114 research outputs found
Deployable lattice column
Lattice column, made up of many individually collapsible sections connected in tandem, rapidly raises measuring instruments to a level appreciably above that where data is to be recorded and evaluated. The column may be collapsed by collapsing each section in sequence and is deployed by extending each section in sequence
Optimum design of columns supported by tension ties
Optimum design of thin walled cylindrical columns supported by tension tie
The Molonglo Galactic Plane Survey (MGPS-2): Compact Source Catalogue
We present the first data release from the second epoch Molonglo Galactic
Plane Survey (MGPS-2). MGPS-2 was carried out with the Molonglo Observatory
Synthesis Telescope at a frequency of 843 MHz and with a restoring beam of 45
arcsec x 45 arcsec cosec(dec), making it the highest resolution large scale
radio survey of the southern Galactic plane. It covers the range |b| < 10 deg
and 245 deg < l < 365 deg and is the Galactic counterpart to the Sydney
University Molonglo Sky Survey (SUMSS) which covers the whole southern sky with
dec 10 deg).
In this paper we present the MGPS-2 compact source catalogue. The catalogue
has 48,850 sources above a limiting peak brightness of 10 mJy/beam. Positions
in the catalogue are accurate to 1 arcsec - 2 arcsec. A full catalogue
including extended sources is in preparation. We have carried out an analysis
of the compact source density across the Galactic plane and find that the
source density is not statistically higher than the density expected from the
extragalactic source density alone.
We also present version 2.0 of the SUMSS image data and catalogue which are
now available online. The data consists of 629 4.3 deg x 4.3 deg mosaic images
covering the 8100 deg^2 of sky with dec 10 deg. The
catalogue contains 210,412 radio sources to a limiting peak brightness of 6
mJy/beam at dec -50 deg. We describe the
updates and improvements made to the SUMSS cataloguing process.Comment: 12 pages, 9 figures, to be published in MNRAS Note that Figures 8 and
9 are much lower resolution than in the published versio
EPOBF: Energy Efficient Allocation of Virtual Machines in High Performance Computing Cloud
Cloud computing has become more popular in provision of computing resources
under virtual machine (VM) abstraction for high performance computing (HPC)
users to run their applications. A HPC cloud is such cloud computing
environment. One of challenges of energy efficient resource allocation for VMs
in HPC cloud is tradeoff between minimizing total energy consumption of
physical machines (PMs) and satisfying Quality of Service (e.g. performance).
On one hand, cloud providers want to maximize their profit by reducing the
power cost (e.g. using the smallest number of running PMs). On the other hand,
cloud customers (users) want highest performance for their applications. In
this paper, we focus on the scenario that scheduler does not know global
information about user jobs and user applications in the future. Users will
request shortterm resources at fixed start times and non interrupted durations.
We then propose a new allocation heuristic (named Energy-aware and Performance
per watt oriented Bestfit (EPOBF)) that uses metric of performance per watt to
choose which most energy-efficient PM for mapping each VM (e.g. maximum of MIPS
per Watt). Using information from Feitelson's Parallel Workload Archive to
model HPC jobs, we compare the proposed EPOBF to state of the art heuristics on
heterogeneous PMs (each PM has multicore CPU). Simulations show that the EPOBF
can reduce significant total energy consumption in comparison with state of the
art allocation heuristics.Comment: 10 pages, in Procedings of International Conference on Advanced
Computing and Applications, Journal of Science and Technology, Vietnamese
Academy of Science and Technology, ISSN 0866-708X, Vol. 51, No. 4B, 201
Computer-aided Melody Note Transcription Using the Tony Software: Accuracy and Efficiency
accepteddate-added: 2015-05-24 19:18:46 +0000 date-modified: 2017-12-28 10:36:36 +0000 keywords: Tony, melody, note, transcription, open source software bdsk-url-1: https://code.soundsoftware.ac.uk/attachments/download/1423/tony-paper_preprint.pdfdate-added: 2015-05-24 19:18:46 +0000 date-modified: 2017-12-28 10:36:36 +0000 keywords: Tony, melody, note, transcription, open source software bdsk-url-1: https://code.soundsoftware.ac.uk/attachments/download/1423/tony-paper_preprint.pdfWe present Tony, a software tool for the interactive an- notation of melodies from monophonic audio recordings, and evaluate its usability and the accuracy of its note extraction method. The scientific study of acoustic performances of melodies, whether sung or played, requires the accurate transcription of notes and pitches. To achieve the desired transcription accuracy for a particular application, researchers manually correct results obtained by automatic methods. Tony is an interactive tool directly aimed at making this correction task efficient. It provides (a) state-of-the art algorithms for pitch and note estimation, (b) visual and auditory feedback for easy error-spotting, (c) an intelligent graphical user interface through which the user can rapidly correct estimation errors, (d) extensive export functions enabling further processing in other applications. We show that Tony’s built in automatic note transcription method compares favourably with existing tools. We report how long it takes to annotate recordings on a set of 96 solo vocal recordings and study the effect of piece, the number of edits made and the annotator’s increasing mastery of the software. Tony is Open Source software, with source code and compiled binaries for Windows, Mac OS X and Linux available from https://code.soundsoftware.ac.uk/projects/tony/
Intonation in unaccompanied singing: Accuracy, drift, and a model of reference pitch memory
Copyright 2014 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.
The following article appeared in J. Acoust. Soc. Am. 136, 401 (2014) and may be found at http://dx.doi.org/10.1121/1.4881915
Optimisation and comparison of transient expression methods to express the green fluorescent protein in the obligate biotrophic oomycete Plasmopara viticola
Grape downy mildew is caused by Plasmopara viticola, an obligate biotrophic oomycete and a major pathogen of grapevine. Studying obligate biotrophic pathogens is difficult as they cannot grow without their host. We therefore attempted to develop a method where the pathogen could be visualized and quantified in planta without killing the host plant. To this end P. viticola was transformed with the marker gene gfp coding for the green fluorescent protein. Various transformation methods, namely electroporation, particle bombardment and transformation with Agrobacterium tumefaciens were applied. Although some methods yielded positive transformation events, no stable strain of P. viticola expressing gfp could be generated. Using the electroporation method, we obtained transient P. viticola transformants expressing gfp over 4 generations. In contrast, particle bombardment failed in transforming P. viticola. Transformation with A. tumefaciens had a low efficiency, only some structures were fluorescent and fluorescence was never observed in the subsequent generations.
Radio sources with ultra-high polarization
A sample of 129 unresolved radio sources with ultrahigh linear polarization
(>30 per cent) has been selected from the NRAO VLA Sky Survey. Such high
average linear polarization is unusual in extragalactic sources. Higher
resolution Australia Telescope Compact Array and Very Large Array observations
confirm the high average polarization but find that most of these sources are
extended. The Sloan Digital Sky Survey spectroscopy, where available, shows
that the optical counterparts are elliptical galaxies with no detectable
emission lines. The optical spectra, radio luminosity, linear size and spectral
index of these sources are typical of radio-loud active galactic nuclei. Galaxy
counts within a 1 Mpc radius of the radio sources show that these highly
polarized sources are in environments similar to their low polarization (<2 per
cent) counterparts. Similarly, the line-of-sight environments of the ultrahigh
polarization sources are on average indistinguishable from those of the
low-polarization sources. We conclude that the extraordinarily high average
polarization must be due to intrinsic properties of the sources, such as an
extremely ordered source magnetic field, low internal thermal plasma density or
a preferential orientation of the source magnetic field perpendicular to the
line of sight.Comment: 23 pages, 15 figures, 6 tables, accepted for publication in MNRAS;
v2: some typos correcte
Anwendung des Prinzips der nachhaltigen Entwicklung für die Ressource Landschaft : Fallstudien zum Konzept der institutionellen Ressourcenregime
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