113,151 research outputs found
Large scale phyto-treatment for ecosystem Restoration: the San Niccolò experiment
No full textSince 1930, a large part of the Massaciuccoli Lake coastal marshy area (Tuscany, Italy) has been drained for agricultural purposes by means of a complex network of artificial drains and pumping stations. In the drained areas, peat soils, with values of organic matter up to 50% in some cases, are largely present (Pistocchi et al. 2012). Conventional agriculture (80%) characterises land use. As a consequence of land use, several environmental concerns arose in the last 50 years, mostly related to: I. the eutrophication status of the lake caused by nutrient enrichment (N, P) in surface- and ground-water (Rossetto et al. 2010a) then pumped into the large water body. Indeed, from the 1970s, the lake, from an initial oligotrophic status, progressively converted to an eutrophic/hypereutrophic status; II. the subsidence (2-3 m in 70 years) of the lake bordering areas due to soil compaction and increased mineralization, which left the lake perched above the drained area, now 0 to 4 m below the mean sea level (Rossetto et al. 2010b).
Setting-up a phyto-treatment system was identified as a solution to improve water quality and to decrease soil organic matter mineralisation, with the final aim of restoring the ecological functions and providing a way to maintain sustainable agricultur
A QFD framework for quality, innovation and high-tech product development dynamics
No full textThe customer mostly chooses a product on the base of its quality, which therefore arises as the main cause of its commercial success. In a nearly axiomatic drawing, it follows that the effect of innovation is the improvement of quality, which itself becomes the aim of innovation. Even though the previous statement relates quality and innovation, it still does not explain their dynamics. To stress them, the ‘quality' concept must be analyzed in more detail. In fact, in addition to the ‘perceived quality', the quality ensured through `design, manufacturing and marketing' combined domains should be dealt with. This paper enhances this issue taking advantage of principles and models made available by control theory schemes coupled with quality function development (QFD) and best practice software modeling based on unified modeling language (UML
Gate stability of GaN-Based HEMTs with P-Type Gate
No full textThis paper reports on an extensive investigation of the gate stability of GaN-based High Electron Mobility Transistors with p-type gate submitted to forward gate stress. Based on combined electrical and electroluminescence measurements, we demonstrate the following results: (i) the catastrophic breakdown voltage of the gate diode is higher than 11 V at room temperature; (ii) in a step-stress experiment, the devices show a stable behavior up to VGS= 10 V, and a catastrophic failure happened for higher voltages; (iii) failure consists in the creation of shunt paths under the gate, of which the position can be identified by electroluminescence (EL) measurements; (iv) the EL spectra emitted by the devices consists of a broad emission band, centered around 500–550 nm, related to the yellow-luminescence of GaN; and (v) when submitted to a constant voltage stress tests, the p-GaN gate can show a time-dependent failure, and the time to failure follows a Weibull distribution.Meneghini, M.; Rossetto, I.; Rizzato, V.; Stoffels, S.; Van Hove, M.; Posthuma, N.; Wu, T.-L.; Marcon, D.; Decoutere, S.; Meneghesso, G.; Zanoni, E. Gate Stability of GaN-Based HEMTs with P-Type Gate. Electronics 2016, 5, 14
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
Physicians' compliance with the Padua Prediction Score for preventing venous thromboembolism among hospitalized medical patients.
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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