12,801 research outputs found
McRunjob: A High Energy Physics Workflow Planner for Grid Production Processing
McRunjob is a powerful grid workflow manager used to manage the generation of
large numbers of production processing jobs in High Energy Physics. In use at
both the DZero and CMS experiments, McRunjob has been used to manage large
Monte Carlo production processing since 1999 and is being extended to uses in
regular production processing for analysis and reconstruction. Described at
CHEP 2001, McRunjob converts core metadata into jobs submittable in a variety
of environments. The powerful core metadata description language includes
methods for converting the metadata into persistent forms, job descriptions,
multi-step workflows, and data provenance information. The language features
allow for structure in the metadata by including full expressions, namespaces,
functional dependencies, site specific parameters in a grid environment, and
ontological definitions. It also has simple control structures for
parallelization of large jobs. McRunjob features a modular design which allows
for easy expansion to new job description languages or new application level
tasks.Comment: CHEP 2003 serial number TUCT00
A microtonal wind controller building on Yamaha’s technology to facilitate the performance of music based on the “19-EDO” scale
We describe a project in which several collaborators adapted an existing instrument to make
it capable of playing expressively in music based on the microtonal scale characterised by equal
divsion of the octave into 19 tones (“19-EDO”). Our objective was not just to build this instrument,
however, but also to produce a well-formed piece of music which would exploit it
idiomatically, in a performance which would provide listeners with a pleasurable and satisfying
musical experience. Hence, consideration of the extent and limits of the playing-techniques of
the resulting instrument (a “Wind-Controller”) and of appropriate approaches to the composition
of music for it were an integral part of the project from the start. Moreover, the intention
was also that the piece, though grounded in the musical characteristics of the 19-EDO scale,
would nevertheless have a recognisable relationship with what Dimitri Tymoczko (2010) has
called the “Extended Common Practice” of the last millennium. So the article goes on to consider
these matters, and to present a score of the resulting new piece, annotated with comments
documenting some of the performance issues which it raises. Thus, bringing the project to
fruition involved elements of composition, performance, engineering and computing, and the
article describes how such an inter-disciplinary, multi-disciplinary and cross-disciplinary collaboration
was co-ordinated in a unified manner to achieve the envisaged outcome. Finally, we
consider why the building of microtonal instruments is such a problematic issue in a contemporary
(“high-tech”) society like ours
Porcine reproductive and respiratory syndrome virus (PRRSV) in GB pig herds : farm characteristics associated with heterogeneity in seroprevalence
Background: The between- and within-herd variability of porcine reproductive and respiratory syndrome virus (PRRSV) antibodies were investigated in a cross-sectional study of 103 British pig herds conducted 2003–2004. Fifty pigs from each farm were tested for anti-PRRSV antibodies using
ELISA. A binomial logistic model was used to investigate management risks for farms with and without pigs with PRRSV antibodies and multilevel statistical models were used to investigate variability in pigs' log ELISA IRPC (relative index Ă— 100) in positive herds.
Results: Thirty-five herds (34.0%) were seronegative, 41 (39.8%) were seropositive and 27 (26.2%) were vaccinated. Herds were more likely to be seronegative if they had < 250 sows (OR 3.86 (95% CI 1.46, 10.19)) and if the nearest pig herd was ≥ 2 miles away (OR 3.42 (95% CI 1.29, 9.12)). The
mean log IRPC in seropositive herds was 3.02 (range, 0.83 – 5.58). Sixteen seropositive herds had only seropositive adult pigs. In these herds, pigs had -0.06 (95% CI -0.10, -0.01) lower log IRPC for every mile increase in distance to the nearest pig unit, and -0.56 (95% CI -1.02, -0.10) lower log IRPC when quarantine facilities were present. For 25 herds with seropositive young stock and adults, lower log IRPC were associated with isolating purchased stock for ≥ 6 days (coefficient - 0.46, 95% CI -0.81, -0.11), requesting ≥ 48 hours 'pig-free time' from humans (coefficient -0.44, 95% CI -0.79, -0.10) and purchasing gilts (coefficient -0.61, 95% CI -0.92, -0.29).
Conclusion: These patterns are consistent with PRRSV failing to persist indefinitely on some infected farms, with fadeout more likely in smaller herds with little/no reintroduction of infectious stock. Persistence of infection may be associated with large herds in pig-dense regions with repeated reintroduction
Man’s Impact on the Coastline
The coastline is important to man as a site of settlement, commercial, industrial and leisure activity and is likely to be important for the production of energy in the future. It has been greatly affected by human activity. Coastal protection schemes, stabilisation of channels in estuaries and on deltas, reclamation and urbanisation have produced profound changes, often with unexpected results. Also, human activities in the drainage basins of the adjacent hinterland have had important consequences on the coasts by influencing the supply of sediment, nutrient and pollutants. Climatic and sea level changes are likely to greatly affect this vulnerable zone in the future.La zona costera es importante para el ser humano como área de asentamiento y para el desarrollo de actividades comerciales, industriales y de esparcimiento; asimismo, será importante en un futuro para la producciĂłn de energĂa. Sin embargo, esta zona ha sufrido importantes afecciones derivadas de la actividad humana. Proyectos de protecciĂłn costera, de estabilizaciĂłn de canales en estuarios y deltas, y la ocupaciĂłn y urbanizaciĂłn de espacios costeros han provocado cambios profundos, a menudo, con resultados inesperados. Igualmente, las actividades humanas en las cuencas de drenaje de las zonas continentales adyacentes tienen consecuencias importantes sobre la costa, incidiendo sobre el suministro de sedimento, nutrientes y contaminantes. Las variaciones climáticas y del nivel marino probablemente afectarán en el futuro de modo importante a esta zona tan vulnerable
Summary of Workshop to Review an OMB Report on Regulatory Risk Assessment and Management
Summary of the results of an invitational workshop conducted to peer review the 1990 OMB report, CURRENT REGULATORY ISSUES IN Risk ASSESSMENT AND Risk MANAGENMENTIN REGULATORY PROGRAM OF THE UNITED STATES GOVERNMENT, APRIL 1, 1990 - MARCH 31, 1991
Error correction and diversity analysis of population mixtures determined by NGS
The impetus for this work was the need to analyse nucleotide diversity in a viral mix taken from honeybees. The paper has two findings. First, a method for correction of next generation sequencing error in the distribution of nucleotides at a site is developed. Second, a package of methods for assessment of nucleotide diversity is assembled. The error correction method is statistically based and works at the level of the nucleotide distribution rather than the level of individual nucleotides. The method relies on an error model and a sample of known viral genotypes that is used for model calibration. A compendium of existing and new diversity analysis tools is also presented, allowing hypotheses about diversity and mean diversity to be tested and associated confidence intervals to be calculated. The methods are illustrated using honeybee viral samples. Software in both Excel and Matlab and a guide are available at http://www2.warwick.ac.uk/fac/sci/systemsbiology/research/software/,the Warwick University Systems Biology Centre software download site.Publisher PDFPeer reviewe
On the intersections of polynomials and the Cayley–Bacharach theorem
AbstractLet R=K[x1,…,xn] and let f1,…,fn be products of linear forms with fi of degree di. Assume that the fi have d1,…,dn common zeros. Then we determine the maximum number of those zeros that a form of degree k can go through without going through all of them. This is a version of a conjecture of Eisenbud, Green, and Harris. We suggest a possible method for using this to explore the case where the fi are arbitrary forms of degree di with the right number of common zeros
- …