Search results for "Earth"
showing 10 items of 12204 documents
Modeling of biomass smoke injection into the lower stratosphere by a large forest fire (Part II): Sensitivity studies
2006
Abstract. The Chisholm forest fire that burned in Alberta, Canada, in May 2001 resulted in injection of substantial amounts of smoke into the lower stratosphere. We used the cloud-resolving plume model ATHAM (Active Tracer High resolution Atmospheric Model) to investigate the importance of different contributing factors to the severe intensification of the convection induced by the Chisholm fire and the subsequent injection of biomass smoke into the lower stratosphere. The simulations show strong sensitivity of the pyro-convection to background meteorology. This explains the observed coincidence of the convective blow-up of the fire plume and the passage of a synoptic cold front. Furthermor…
Evaluating a hierarchical approach to landscape-level harvest scheduling
2018
Forest planning at the landscape level has the potential to become a large intractable problem. In Finland, Metsähallitus (the state enterprise that manages federally owned land) creates strategic plans to determine the appropriate harvest level. While these plans are feasible, they are not implementable in practice as the harvests are scattered temporally and spatially. Requiring that harvests be organized both temporally and spatially for practical implementation can result in an intractable problem. Through a hierarchical approach, the problem can be organized into steps in which the intractable problem is broken down into smaller easily solvable parts. As an approximation technique, th…
Use of Wood Ash in the Forest and its Effect on the Concentration of Essential and Heavy Metallic Elements in Soil and Blueberries <i>(Vacciniu…
2020
The aim of this research is to evaluate the influence of wood ash as an additive fertilizer to forest soil and growing blueberries (Vaccinium myrtillus L.) in terms of metallic element content. To evaluate the effect of wood ash on the forest ecosystem, was selected two forest areas which was fertilized with a certain amount of wood ash (bottom ash and fly ash). The selected forest areas were divided into two types of sampling plots (fertilized with ash and control). Obtained results showed that in the bottom ash dispersion area the concentration of Ca, K, Ni, Cu is almost twice higher in the fertilized plots than control plots. In the blueberries, metallic element content is similar and do…
A reactive nitrogen budget for forest land and wetlands in Latvia and Estonia
2020
Human intervention in global nitrogen cycling has led to excess reactive nitrogen (Nr) flows to the environment, impacting terrestrial ecosystems as well as the quality of the atmosphere and waterb...
Adsorption et desorption de la terbutryne par une montmorillonite-Ca et des acides humiques seuls ou en melanges
1977
Resume: L' effet du pH sur l'adsorption de la terbutryne par des acides humiques, une montmorillonite-Ca ou leurs melanges montre une certaine similitude de comportement entre ces derniers et l'argile seule. Au voisinage de la neutralite, seuls les acides humiques adsorbent la terbutryne. En milieu acide, les isothermes d'adsorption de la terbutryne par les acides humiques et la montmorillonite sont respectivement de type L et S et traduisent une affinite adsorbat-adsorbant differente; les isothermes d'adsorption correspondant aux melanges ont une forme differente et font apparaitre un effet de synergie, en particulier dans le cas des melanges pauvres en acides humiques. La dsorption saccom…
Statement complementing the EFSA Scientific Opinion on application (EFSA‐GMO‐DE‐2011‐95) for the placing on the market of genetically modified maize …
2018
Abstract The GMO Panel was previously not in the position to complete the food/feed safety assessment of maize 5307 due to an inadequate 28‐day toxicity study necessary for an appropriate assessment of eCry3.1Ab protein. Following a mandate from the European Commission, the GMO Panel assessed a supplementary 28‐day toxicity study in mice on the eCry3.1Ab protein (1,000 mg/kg body weight (bw) per day) to complement its scientific opinion on application EFSA‐GMO‐DE‐2011‐95 for the placing on the market of the maize 5307 for food and feed uses, import and processing. The supplementary 28‐day toxicity study did not show adverse effects. Taking into account the previous assessment and the new in…
Assessment of genetically modified sugar beet H7‐1 for renewal of authorisation under Regulation (EC) No 1829/2003 (application EFSA‐GMO‐RX‐006)
2017
Efsa Panel On Genetically Modified Organisms (gmo)Scientific opinionRequestor: European Commission (DG SANTE)Question number: EFSA-Q-2017-00026; Following the submission of application EFSA-GMO-RX-006 under Regulation (EC) No 1829/2003 fromKWS SAAT SE and Monsanto Company, the Panel on Genetically Modified Organisms of the EuropeanFood Safety Authority (GMO Panel) was asked to deliver a scientific risk assessment on the datasubmitted in the context of the renewal of authorisation application for the herbicide-tolerantgenetically modified sugar beet H7-1. The data received in the context of this renewal applicationcontained a systematic search and evaluation of literature, updated bioinforma…
Scientific Opinion on application EFSA‐GMO‐BE‐2013‐118 for authorisation of genetically modified maize MON 87427 × MON 89034 × 1507 × MON 88017 × 591…
2017
Abstract In this opinion, the GMO Panel assessed the five‐event stack maize MON 87427 × MON 89034 ×1507 × MON 88017 × 59122 and its 25 subcombinations, independently of their origin. The GMO Panel has previously assessed the five single events combined to produce this five‐event stack maize and 11 subcombinations of these events and did not identify safety concerns. No new data on the single events or their previously assessed subcombinations, leading to modification of the original conclusions were identified. The combination of the single events and of the newly expressed proteins in the five‐event stack maize did not give rise to issues – based on the molecular, agronomic/phenotypic or c…
Estructura de las competencias del siglo XXI en alumnado del ámbito educativo. Factores personales influyentes
2019
El avance continuo de las tecnologías de la información y de la comunicación (TIC) en la actual Sociedad del Conocimiento ha supuesto la demanda de formación en nuevas competencias, denominadas competencias del siglo XXI. Estas se componen de competencias de alta habilidad (capacidades de pensamiento superior y competencias de trabajo en equipo) y competencias en TIC (tecnológicas, pedagógicas y éticas). El objetivo de este trabajo es la validación de un modelo de relación explicativa de las competencias en TIC respecto a las competencias de alta habilidad en el alumnado universitario perteneciente a titulaciones del ámbito educativo, considerando factores personales influyentes. Para ello,…
Perfiles de segregación escolar por nivel socioeconómico en España y sus Comunidades Autónomas
2019
Las investigaciones que estiman la magnitud de la segregación escolar por nivel socioeconómico realizadas hasta el momento ofrecen una imagen excesivamente simplista que no es capaz de reflejar la realidad altamente compleja del fenómeno. Este trabajo presenta un enfoque alternativo de análisis e interpretación de la segregación escolar. Concretamente, busca determinar el perfil de segregación escolar por nivel socioeconómico de España y sus Comunidades Autónomas, y establecer modelos de segregación de las Comunidades. Para ello, se realiza una explotación especial de los datos de PISA 2015. Como variable criterio se utiliza el nivel socioeconómico y cultural de las familias (NSEC). El anál…