Search results for "Sources"
showing 10 items of 2554 documents
Critical range of soil organic carbon in southern Europe lands under desertification risk.
2021
Soil quality is fundamental for ecosystem long term functionality, productivity and resilience to current climatic changes. Despite its importance, soil is lost and degraded at dramatic rates worldwide. In Europe, the Mediterranean areas are a hotspot for soil erosion and land degradation due to a combination of climatic conditions, soils, geomorphology and anthropic pressure. Soil organic carbon (SOC) is considered a key indicator of soil quality as it relates to other fundamental soil functions supporting crucial ecosystem services. In the present study, the functional relationships among SOC and other important soil properties were investigated in the topsoil of 38 sites under different …
Contribution to the Sustainability Challenges of the Food-Delivery Sector: Finding from the Deliveroo Italy Case Study
2020
The food delivery sector is assuming increasing importance in the distribution of food products and meals as it is becoming an ordinary component of consumption habits. However, the growth of the sector has inevitably affected the demand for freight transport, especially in urban areas. The aim of this study was to investigate the main enabling factors affecting the adoption of sustainable strategies, among which the electro-mobility, in the food delivery sector and what obstacles to dissemination can be seen. Deliveroo s.r.l. was chosen as case study. Results show that Deliveroo undoubtedly represents a good example of sustainable logistics and the dissemination of good practices among the…
Higher Education in a Sustainable Society: Addressing Knowledge Disparities and Enabling Debate
2015
Sustainability is a comprehensive concept. It addresses the complex relation between and effect of social and economic development. It is a concept that challenges us to see things in relation to each other and in a larger perspective. The sustainability challenge however, comes at a time when sciences and research has expanded but at the same time is more fragmented than ever. In this chapter we introduce Mutual Competence Building a concept for guiding the sustainability engagement of Higher Education.
Properties of Swift's intermediate bursts
2011
Based on their prompt, high-energy emission, gamma-ray bursts are usually classified into short-duration and long-duration classes. A third intermediate group has been identified on statistical grounds but its individual properties have not yet been studied in detail. Using the large sample of follow-up observations of GRBs produced during the Swift era we analyze the individual characteristics of this group. We find that intermediate bursts are significantly different from short GRBs but share many properties with long bursts, probably pointing to a common progenitor type. However, we find that intermediate bursts are significantly dimmer and have on average lower redshifts. Based on their…
Europe's offshore winds assessed with synthetic aperture radar, ASCAT and WRF
2020
Europe's offshore wind resource mapping is part of the New European Wind Atlas (NEWA) international consortium effort. This study presents the results of analysis of synthetic aperture radar (SAR) ocean wind maps based on Envisat and Sentinel-1 with a brief description of the wind retrieval process and Advanced Scatterometer (ASCAT) ocean wind maps. The wind statistics at 10 and 100 m above mean sea level (a.m.s.l.) height using an extrapolation procedure involving simulated long-term stability over oceans are presented for both SAR and ASCAT. Furthermore, the Weather Research and Forecasting (WRF) offshore wind atlas of NEWA is presented. This has 3 km grid spacing with data …
Un sistema de indicadores para el seguimiento y evaluación de la gestión sostenible del patrimonio cultural
2013
This paper describes the general procedure followed to build a system of indicators for monitoring and evaluating the Strategy for Culture and Development of Spanish Cooperation. Taking the Sustainable Management of Cultural Heritage as a reference, in this study an approach is made to questions relative to: 1) the process of evaluating a list of indicators by a panel of experts using the Delphi technique, 2) the definition and calculation of a relative operational index, 3) the process of indicator selection, and lastly, 4) how the selected indicators were assigned to form part of the basic or strategic dimension on which the system is structured. En este trabajo se describe el procedimie…
Challenges concerning argumentative writing in a second language context
2018
The current study is based on parts of the data collected in a quasi-experiment conducted in four English classes of Norwegian upper secondary school students. The purpose of the quasi-experiment was to explore whether a teaching intervention based on systemic functional linguistics and genre-pedagogy would support students in improving their competence in writing argumentative texts in English. The improvement was measured by comparing evaluations of pre-and post-tests. The current study investigates what seemed to be the main challenges for Norwegian students concerning this type of genre in a second language context based on the pre-tests and the evaluations of the pre-tests. The most ch…
A reexamination of voltage distortion for classical carrier-based vs B-Spline modulation of three-phase Voltage Sources Inverters
2015
Voltage waveform improvement has been the object of several investigations for many years and a manifold of different solutions have been proposed to reduce the harmonic content in Voltage Source Inverters (VSI) power application. In many cases this improvements have been obtained by modifying the reference voltage modulating signal. The recent introduction of cardinal B-spline functions, used as carrier signals, has given rise to a new modulation technique whose main characteristic is a lower value of the Total Harmonic Distortion (THD). After the discussion on the B-Spline modulation principle and on its computational effort, a performance comparisons is carried out by means of Total Harm…
ICT USE AT STUDENTS: RISKS AND RESOURCES
2019
L’usage des technologies de l’information et de la communication (TIC : Internet, réseaux sociaux, téléphone portable) est largement répandu chez les étudiants. Nous nous proposons de faire un état des lieux concernant les relations entre les étudiants et les TIC sous deux axes opposés : l’axe psychopathologique et l’axe « ressource ». D’un côté sont recensées les pathologies liées à l’usage de ces supports (usage problématique et addictions – notamment à la pornographie, cyberharcèlement) en termes de fréquence et de comorbidités. D’un autre côté, nous faisons l’état des lieux des dispositifs basés sur les TIC à visée de ressources, d’aide et de soin : de l’immersion en réalité virtuelle, …
Curricula for the teaching of complete dentures in Spanish and Portuguese dental schools
2012
Objectives: Given the need to ensure that dentists are sufficiently skilled to offer the best possible care to their patients, this study aims to evaluate the teaching methods and clinical experience achieved by undergraduate dental students in Spain and Portugal as regards complete dentures. Study design: In February 2011, a questionnaire seeking information about the preclinical and clinical teaching of complete dentures was e-mailed to all Spanish and Portuguese dental schools with fully developed undergraduate degree dental programs. Results: A response rate of 82.6% was obtained. The distribution of lectures and hours spent at the laboratory and in clinical activities revealed that tea…