Search results for "Planet"

On the occurrence of ClO in cirrus clouds and volcanic aerosol in the tropopause region

1997

Airborne observations during descents of the ER-2 through layers of volcanic aerosol (Mount Pinatubo eruption of 1991) and a cirrus cloud are utilized to study the the abundance of ClO and its relation to aerosol surface area in the midlatitude tropopause region. During a cirrus event near the tropopause ClO mixing ratios up to 2.7 pptv were detected and near the tropopause ClO levels from a few to 70 pptv were found. These measurements are associated with large experimental uncertainties but demonstrate the possible presence of ClO inside cirrus clouds and near the tropopause. Model calculations show that possible enhancements of ClO by heterogeneous chemistry on cirrus cloud particles cou…

Iron(III) Clusters from Polydentate Schiff Base Ligands: Involvement of Non Heisenberg Interaction in [FeIII 3(µ2-OR)3(µ2-O2CPh)3]3+ Clusters

2018

Evaluation of remote sensing of vegetation fluorescence by the analysis of diurnal cycles

2008

Chlorophyll fluorescence (ChF) emission is a direct indicator of the photosynthetic activity of vegetation, which is a key parameter of the carbon cycle. This paper analyses chlorophyll fluorescence evolution at leaf level during a complete diurnal cycle in simulated and natural conditions, for two species under different stress conditions. Absolute spectral radiance of the ChF emission is obtained allowing a quantitative derivation of the fluorescence yield of the ChF, which correlates well with established fluorescence instruments. The studied cases show that the ChF emission is mainly driven by the photosynthetic active radiation during the whole cycle, but the fluorescence yield is seve…

Réactivité d'hydrures de tantalocène : insertion du soufre dans la liaison tantale-hydrogène

1997

Resume La recherche entreprise sur la reactivite des hydrures de tantalocene avec le soufre elementaire nous amene a la synthese de complexes monosoufres par une reaction d'insertion du soufre dans la liaison Ta-H. Des informations sont apportees sur le mecanisme de la formation de complexes a ligand (η2-S2) et la synthese du complexe Cp′2Ta(CO)(SH) est decrite.

Idiopathic Non-Dental Facial Pain Syndromes in Italian Children: A Clinical Case Series

2023

Background. The orofacial pain syndromes (OFPs) are a heterogeneous group of syndromes characterized by painful attacks involving the orofacial structures. They may be summarily subdivided into two great categories: (1) orofacial pain mainly attributed to dental disorders such as dentoalveolar and myofascial orofacial pain or temporomandibular joint (TM) pain; (2) orofacial pain mainly attributed to non-dental pain as neuralgias, facial localization of primary headaches or idiopathic orofacial pain. The second group is uncommon, often described by single case reports, can often show overlapping symptoms with the first group, and represents a clinical challenge, carrying the risk of underval…

Evaluation of Hybrid Models to Estimate Chlorophyll and Nitrogen Content of Maize Crops in the Framework of the Future CHIME Mission

2022

In the next few years, the new Copernicus Hyperspectral Imaging Mission (CHIME) is foreseen to be launched by the European Space Agency (ESA). This mission will provide an unprecedented amount of hyperspectral data, enabling new research possibilities within several fields of natural resources, including the “agriculture and food security” domain. In order to efficiently exploit this upcoming hyperspectral data stream, new processing methods and techniques need to be studied and implemented. In this work, the hybrid approach (HYB) and its variant, featuring sampling dimensionality reduction through active learning heuristics (HAL), were applied to CHIME-like data to evaluate the…

Changing forest stakeholders’ perception of ecosystem services with linguistic nudging

2019

This paper explores whether the perceptions of forest owners and professionals could be nudged towards more sustainable management practices by adjusting a policy text's metaphorical content. Recent research has demonstrated a link between information interventions and preference change, but there is a need to further explore individuals' reactions to information on forest-based ecosystem services and to link these to the design of policy instruments. We contribute to narrowing this gap by nudging the content of a policy text comparing rotation forest management (RFM) and continuous cover forestry (CCF), and exposing it to forest stakeholders. The research is carried out in Finland, the so-…

La atención al ODS 12 en la Educación Científica. Propuesta didáctica para su incorporación en Ed. Secundaria

2020

El Antropoceno se ha propuesto como un nuevo periodo caracterizado por la evidente y generalizada influencia de la humanidad en el registro geológico. En el presente TFM se propone su uso en didáctica de las ciencias como herramienta para la concienciación del alumnado y en general para toda la ciudadanía, dado que aúna todos los problemas socioambientales actuales y sus causas La utilización del concepto puede contribuir a la implicación del alumnado y a afrontar las las medidas que se requieren, de forma más eficiente, evitando el olvido de la atención a algunos de los problemas que constituyen la problemática holística de la insostenibilidad. Además de analizar su utilización en la enseñ…

Hair Cortisol Concentration as a Biomarker of Sleep Quality and Related Disorders

2021

Cortisol is the end product of the hypothalamic-pituitary-adrenal (HPA) axis, and its production is increased mainly in stressful situations or in chronic disorders accompanied by stress enhancement. Altered cortisol concentrations have been reported in a number of neuropsychiatric diseases and sleep disorders. Cortisol concentrations have been measured using several methods, and in several matrixes, such as blood, saliva, and urine. However, lately, hair cortisol, for several reasons, has emerged as a promising biomarker of long-term retrospective HPA activation. Several experimental approaches for cortisol measurement with the corresponding concentration reference ranges and a summary of …

The good, the bad and the ugly: images of the foreigner in contemporary criminal law

2018

Since the end of the Second World War, the criminal law of Western states has tried to legitimate itself, in basically democratic-republican terms, as primarily addressed towards citizens. During approximately the last 20 years, however, new dimensions of criminal law have emerged, which refer paradigmatically (not to the citizen, but) to the foreigner and subject him/her to worse legal treatment than that which is considered legitimate when either citizens or ‘good’ foreigners are concerned. Next to the ideal-type of the citizen criminal law (also applicable, by assimilation, to the ‘good’ foreigner) a criminal law for ‘ugly’ mass-foreigners (crimmigration) and one for ‘bad’ foreigners (en…