86,645 research outputs found
Wolf population monitoring and livestock depredation preventive measures in Europe
No full textReliable estimates of population parameters and their trends are necessarynfor effective management and conservation actions, especially for endangered species such as wolves in most European countries. Under the Habitat Directive 92/43/CEE, all countries are required to monitor the status of their endangered populations. The ultimate goal of population monitoring is to detect a change in both magnitude and direction for one of the population parameters. We discuss the importance of wolf populations monitoring in Europe, giving examples from the contributions of this theme issue, and we highlight the technical challenges of transboundary monitoring and of preventive measures implementation
Accuracy in scat collection for diet analysis: wolves in the Western Alps as a case study
No full textUAV-based GNSS-R for water detection as a support to flood monitoring operations: A feasibility study
No full textSignals from global navigation satellite systems (GNSS) can be utilized as signals of opportunity in remote sensing applications. Geophysical properties of the earth surface can be detected and monitored by processing the back-scattered GNSS signals from the ground. In the literature, several airborne GNSS-based passive radar experiments have been successfully demonstrated. With the advancements in small unmanned aerial vehicles (UAVs) and their applications for environmental monitoring, we want to investigate whether GNSS-based passive radar can provide valuable geospatial information from such platforms. Low-cost GNSS reflectometry sensors, developed using commercial of the shelf components, can be mounted onboard UAVs and flown to sense environmental parameters. This paper presents the results of a preliminary study to investigate the feasibility of utilizing data collected by UAV-based GNSS-R sensors to detect surface water for a potential application in supporting flood monitoring operations. The study was conducted in the area surrounding the Avigliana lakes in Northern Italy. The results show the possibility of detecting small water surfaces with few tens of meters resolution, and estimating the area of the lake surface with 92% accuracy. Furthermore, it is proved through simulations that the use of multi-GNSS increases this accuracy to about 99%
Non-invasive integrated sampling design to monitor the wolf population in Piemonte, Italian Alps
No full textThe natural return of the wolf (Canis lupus) in the western Alps of Italy and France at the beginning of the 1990's, after 70 years of absence, is an important ecological and social event. The Regione Piemonte, in the course of the Progetto Lupo Piemonte, intensively monitored the wolf population over the Piemonte territory from 1999 to 2010. We estimated four main population parameters over time (wolf population size, number of packs, distribution, and effective population size) in order to follow the natural recolonization process over the Alps. An integrated sampling approach was designed to collect data to estimate simultaneously and cost-effectively these four parameters. This combined monitoring program allowed the development of specific management strategies for the mitigation of wolf-human conflicts, given the protected status of the alpine wolf population. This transboundary wolf population, which dispersed over the Alps of Italy, France, Switzerland, and now is reaching the Eastern Alps, has been considered a unique and distinct entity by the European Commission after the "Guidelines for Population Level Management Plans for large Carnivores". Therefore, it should be monitored and managed as such over the boundaries, and this cost-effective sampling approach should be considered in this framework
Sistema Terminale Utente/Local Element per il posizionamento NRTK/EGNOS in Ambiente Urbano
No full textMass-Market Receiver for Static Positioning: Tests and Statistical Analyses
No full textNowadays, there are several low cost GPS receivers able to provide both pseudorange and carrier phase measurements in the L1band, that allow to have good realtime performances in outdoor condition. The present paper describes a set of dedicated tests in order to evaluate the positioning accuracy in static conditions. The quality of the pseudorange and the carrier phase measurements let hope for interesting results. The use of such kind of receiver could be extended to a large number of professional applications, like engineering fields: survey, georeferencing, monitoring, cadastral mapping and cadastral road. In this work, the receivers performance is verified considering a single frequency solution trying to fix the phase ambiguity, when possible. Different solutions are defined: code, float and fix solutions. In order to solve the phase ambiguities different methods are considered. Each test performed is statistically analyzed, highlighting the effects of different factors on precision and accurac
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
Confronti preliminari tra differenti layout di un sistema a punto fisso per l’applicazione dei prodotti fitosanitari in vigneto
No full textIl sistema a punto fisso (Fixed Spray Delivery System – FSDS) per la distribuzione di prodotti fitosanitari (PF) è di crescente interesse in viticoltura e frutticoltura. Il FSDS deriva da una modifica di un impianto di irrigazione sovrachioma, e le sue componenti principali sono una stazione di pompaggio e un sistema di distribuzione. Quest'ultimo è costituito da linee di adduzione, che corrono lungo i filari, e da erogatori posti in chioma al fine di distribuire in modo uniforme la miscela fitoiatrica. La posizione e tipo di erogatori sono elementi cruciali per la distribuzione ottimale dei PF. Al fine di confrontarne la qualità della distribuzione in vigneto di un FSDS, da precedenti studi sono stati identificati quattro layout (L1, L2, L3 e L4). L'analisi dei risultati ha rivelato differenze significative tra i layout valutati sia per i depositi in chioma che per le perdite a terra. Il layout L1 ha evidenziato i depositi più alti, seguito da L3, L2 e L4. Le perdite a terra sono risultate maggiori per le configurazioni L3 e L1 (oltre 5,00 μL/cm), minori per L4 e L2 (meno di 4,00 μL/cm). In generale, layout con alte densità di installazione degli erogatori (L2, L4) dovrebbero favorire l'ottenimento di elevati depositi di miscela in chioma, ma nel caso del FSDS idraulico esaminato, il risultato è stato esattamente opposto. In conclusione, densità di installazione degli erogatori e disposizione degli stessi (layout) risultano cruciali per la distribuzione efficace di PF con un FSDS.The fixed spray delivery system (FSDS), a pesticide application technique based on a modified irrigation system, is raising interest among farmers for spray applications in vineyards and orchards. The hydraulic-based FSDS main components are a pumping station and a distribution system. The distribution system is composed of pipelines, and emitters installed in the canopy in a specific layout. Thus, FSDS layout, and emitter type, are of primary importance to uniformly deliver the spray mixture. Thanks to previous research four FSDS layouts (L1, L2, L3 e L4) were identified, and field tested to compare their spray performance. The dataset analysis showed a statistically significant effect of layout on mean deposition and ground losses. Layout L1 showed higher deposits, followed by L3, L2 e L4. Regarding ground losses, higher values were recorded for L3 e L1(> 5.00 μL/cm), and lower values for L4 e L2 (< 4.00 μL/cm). In general, layouts with a higher emitter density (L2, L4) should promote depositions on the target, but in this case resulted in lower canopy deposits. In conclusion, emitter density and layout are key factors affecting the spray performance of a hydraulic-based FSDS
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