125 research outputs found
Joachim Rossini / procédé A. Collas ; David 1829
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COLLAS: An alternative approach for the analysis of S.L.R. data collected during co-location tests
No full textData taken by laser ranging systems during co-location tests are analysed using various methods. Two proven methods of co-location, using either polyncmial or orbit analysis techniques (POLYQUICK and GEODYN) , are reviewed. An alternative approach using the geometry of quadrangles formed by the laser systems and the satellite predictions is introduced. To test the effectiveness of the developed software, named COLLAS, comparisons have been made to results from GEODYN using simulated data.Civil Engineering and Geoscience
Giuditta Pasta di Milano / A. Collas d'après David
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Kennisbasis WOT Fisheries 2011 - what is in the Programme?
No full textThe KBWOT Fisheries programme is core to the maintenance and development of the expertise that underpins the statutory obligations of fisheries monitoring and advice for the Netherlands. The structure of the KBWOT Fisheries programme for 2011 changed to reflect the recent discussions on the research direction between IMARES, CVO and EL&I. One of the strengths of the structure of the KBWOT Fisheries programme was the bottom up approach to calls for projects to fulfil the research priorities. This however was seen as giving the programme the potential to miss strategic needs of both the science development within IMARES and the research questions of EL&I, thus the programme now also contains a specific project request on an research subject relevant to IMARES and EL&I needs. The KBWOT Fisheries programme will fund 12 projects in 2011. The projects will investigate competition in exploited fish communities, long term changes in eel populations, the spawning habitat of mackerel, sub-stock structure in fish, trawling impact on benthic communities, quality assurance in fish aging, surveys of shellfish, maturity staging of fish and acoustic methods. Plus a targeted project specifically designed to research needs of IMARES and EL&I will be carried out into the trade-offs in FMSY targets for North Sea flatfish fisheries
Generación de un modelo de erosión de la vía Collas, mediante la utilización de sensores y un sistema de información geográfico
No full textLa vía Collas o acceso norte al Aeropuerto Mariscal Sucre, fue entregado por el Ministerio de Transporte y Obras Públicas el 29 de julio del 2014, siendo una de las interconexiones rápidas para los habitantes que se encuentran en el norte de Quito. Se ha visto un proceso importante de erosión en los últimos años, mismo que ha sido generado por la construcción de esta importante arteria vial, por lo que el presente trabajo tiene como objetivo generar un modelo de erosión de la Vía Collas, mediante la utilización de sensores y un sistema de información geográfico. Para lograr cumplir con este objetivo, se caracterizó físicamente el trazado de la Vía Collas mediante observación del área de estudio e información seleccionada con ayuda del sistema ArcGIS 10.3. Luego se identificaron las principales amenazas que causan erosión en base a revisión bibliográfica y criterios técnicos; y finalmente se desarrolló un modelo de simulación en el programa Model Builder de ArcGIS de cada proceso erosivo seleccionado. En dicho modelo se analizaron las variables que comprenden las ecuaciones de pérdida de suelo: 1. Ecuación universal de pérdida de suelo (RUSLE), y 2. Ecuación para estimar el promedio anual potencial de erosión eólica del suelo. Los principales procesos de erosión a los que se encuentra expuesta la vía son la erosión eólica y la erosión hídrica. El proceso de erosión hídrica ha sido minimizado debido a la impermeabilización de los taludes a lo largo de la vía; mientras que la erosión eólica es medianamente significativa en una parte de la vía. En la parte final de trabajo se detalla las recomendaciones para evitar problemas derivados por la erosión y mantenimientoCapítulo I. El problema de la investigación. Capítulo II. Marco teórico. Capítulo III. Metodología. Capítulo IV. Análisis e interpretación de resultados. Capítulo V. Conclusiones y recomendaciones. Capítulo VI. La propuesta. Bibliografía
"Linking Herring": do we really understand plasticity?
No full textThis is a pre-copy-editing, author-produced PDF of an article accepted for publication in ICES Journal of Marine Science following peer review. The definitive publisher-authenticated version Dickey-Collas, M., Clarke, M., and Slotte, A. 2009. “Linking Herring”: do we really understand plasticity? – ICES Journal of Marine Science, 66: 1649–1651 is available online at: http://icesjms.oxfordjournals.org/content/66/8/1649peer-reviewedThe symposium was organized to link our understanding of herring biology, population dynamics, and exploitation in the context of ecosystem complexity. It is beyond argument that herring play a pivotal role in shaping the structure and dynamics of many boreal continental-shelf ecosystems. Therefore, in moving to an ecosystem approach to fishery management, the time seemed right for ICES to hold another herring symposium. Since the last ICES symposia on herring in the 1960s (“Herring Symposium”, 1961; “Biology of Early Stages and Recruitment Mechanisms of Herring”, 1968), many of the old paradigms have been rejected, and substantial progress has been made by striking out along new avenues. In addressing this particular topic, we were also able to follow on from the decadal herring symposia series held in North America, and thus cover new research from both the ICES and PICES communities. The symposium took place from 26 to 29 August 2008, at the National University of Ireland, Galway, Ireland
Outcome after stroke thrombolysis in patients >80 years treated within 3 hours vs >3–4.5 hours
No full textObjective: To determine outcomes and risks of IV thrombolysis (IVT) in patients with acute ischemic stroke (AIS) >80 years of age within 3 hours compared to >3 to 4.5 hours recorded in the Safe Implementation of Treatment in Stroke (SITS) International Stroke Thrombolysis Registry.
Methods: A total of 14,240 (year 2003–2015) patients >80 years of age with AIS were treated with IVT ≤4.5 hours of stroke onset (3,558 in >3–4.5 hours). Of these, 8,658 (2,157 in >3–4.5 hours) were treated otherwise according to the European Summary of Product Characteristics (EU SmPC) criteria for alteplase. Outcomes were 3-month functional independence (modified Rankin Scale score 0–2), mortality, and symptomatic intracerebral hemorrhage (SICH)/SITS. Results were compared between the groups treated in >3 to 4.5 and ≤3 hours.
Results: Median age was 84 years; 61% were female in both groups. Median NIH Stroke Scale score was 12 vs 14 in the >3- to 4.5- and ≤3-hour group, respectively. Three-month functional independence was 34% vs 35% (adjusted odds ratio [aOR] 0.78, 95% confidence interval [CI] 0.69–0.89, p < 0.001); mortality was 31% vs 32% (aOR 1.10, 95% CI 0.97–1.25, p = 0.13); and SICH/SITS was 2.7% vs 1.6% (aOR 1.72, 95% CI 1.25–2.35, p = 0.001). In EU SmPC–compliant patients, 3-month functional independence was 36 vs 37% (aOR 0.79, 95% CI 0.68–0.92, p = 0.002), mortality was 29% vs 29.6% (aOR 1.10, 95% CI 0.95–1.28, p = 0.20), and SICH/SITS was 2.7% vs 1.6% (aOR 1.62, 95% CI 1.12–2.34, p = 0.01).
Conclusions: In this observational study, unselected patients >80 years of age treated with IVT after 3 hours vs earlier had a slightly higher rate of SICH and similar unadjusted functional outcome but poorer adjusted outcome. The absolute difference between the treatment groups is small, and elderly patients should not be denied IVT in the later time window solely because of age without other contraindications
Damping of ship-induced primary waves in groyne fields
No full textRecent ecological studies (Collas et al., 2018) show that ship-induced waves can reduce suitability of fish habitats along the river banks between groynes. Specifically eggs and young fish are vulnerable to these waves (Wolter & Arlinghaus, 2003). For the river Waal in the Netherlands the breeding and growing season of this fauna is from April to September, which generally corresponds to flow conditions where the groynes in the river are not completely submerged. The preferred habitat of fish is in the shallow zones close to the bank, which experience a high degree of hydrodynamic variability due to ship-induced waves. The goal of this research is to explore whether fish habitat during the growing and breeding season can be improved by reducing the flow impact of passing ships through structural modifications (“notching”) of groynes
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