5,434 research outputs found
Uno scavo di Luigi Adriano Milani alla Badia
No full textAttraverso l'analisi del diario di scavo inedito della campagna condotta nel 1901 da Luigi Adriano Milani nella necropoli di Badia, a nord-ovest del pianoro di Volterra si ricostruisce un tassello delle indagini archeologiche delle aree sepolcrali della città etrusca. Nel corso della campagna di scavo furono messi in luce e documentati numerosi ipogei a camera di età ellenistica
Multi-sensor Satellite Precipitation Estimate for Hydrogeological Hazard Mitigation
No full textHigh-impact meteorological events have in the last decade received increasing
interest and considerable efforts are constantly undertaken to mitigate their
effects on human activities and environment.
Several projects addressing different aspects of the risk mitigation strategy have been financed in Europe, and PROSA (Prodotti di Osservazione
Satellitare per l'Allerta Meteorologica - Satellite products for meteorological alert), funded by the Italian Space Agency (ASI), represents the Italian
attempt to solve the meteorological side of the hazard mitigation scheme.
It is devoted to design, develop, test and demonstrate a prototype system
dedicated to the innovative dynamic characterization of meteorological parameters at the ground by means of satellite data.
This work is part of PROSA and the main objective is the implementation
and optimization of three di�erent satellite precipitation estimation algorithms. The algorithms are based on Artificial Neural Networks and correlate multi-sensors satellite data, in the Visible, Infrared (from the European
Geostationary satellite Meteosat) and Microwave bands (from polar orbiting
satellites), to the precipitation rate at ground. The ANNs are set up as classification problem and use rain-gauges data as true values of precipitation at
the ground for the training, testing an validation of the techniques.
The work is divided in three main steps: the first version of the algorithm
gives a binary classification of satellite pixel as rain and no-rain classes, with
seasonal and day-time characterization of the precipitation maps. The second
version gives a quantitative estimate, classifying the rain-rate in five precipitation intervals. Finally, the last version provides precipitation maps with
quantitative values expressed in mmh^-1, and also explicitly uses microwave
data.
To reach the main objective several sensitivity studies and intermediate goals
have been pursued, in order to refine and tune the technique. The sensitivity
to precipitation of the infrared channels with respect to the seasonal cycle and
the impact of the visible channels on the estimates have been assessed. The
relationship between the probability of precipitation, output of the neural network, and the rain-rate, as measured by rain-gauges, has been established
for warm and cold months, and the optimal way to ingest in the algorithm
the microwave estimates has been defined by analyzing the di�erent performances of microwave and visible-infrared techniques. Finally, the results
have been critically discussed in comparison with other algorithms taking
part of the PROSA system
Description of author Lisa Price\u27s hiking trip through the Hundred Mile Wilderne
No full textDescription of author Lisa Price\u27s hiking trip through the Hundred Mile Wilderness, the final section of the Appalachian Trail in Maine. Price, who has hiked the Appalachian Trail for four years, one section at a time, meets up with fellow hikers Noel and Caroline at Shaw\u27s Boarding House in Monson, and the three reach the summit of Mount Katahdin together
Conversatorio con Lisa Garforth=Conversation with Lisa Garforth
No full textJulia Ramírez-Blanco conversa con Lisa Garforth, autora del libro Green Utopias y especialista en utopías medioambientales. Con ella, hablamos acerca de las posibles maneras de definir las ecotopías, y cómo estas se manifiestan tanto en la literatura como en distintas formas de práctica social.Julia Ramírez-Blanco interviews Lisa Garforth, author of the book Green Utopias and specialist in environmental utopias. With her, we talk about the possible ways of defining ecotopias, and how they manifest themselves both in literature and in different forms of social practice.http://re-visiones.net/audio/Entrevista-Lisa-Garfoth.mp
An interview with Alfredo Falcone and Lisa Salvatore: RECOURSE and trifluridine/tipiracil in metastatic colorectal cancer
No full textProfessor Alfredo Falcone and Dr Lisa Salvatore speak to Roshaine Gunawardana, Managing Commissioning Editor: Professor Alfredo Falcone is the Director of the Department of Oncology and the Specialization School at the University Hospital of Pisa, Italy. He trained in Pisa and Genoa, Italy, and has held major positions in Italian oncology since 2000. He currently has more than 300 publications, including papers in peer-reviewed international and national journals, book chapters, and more than 600 abstracts of presentations to international and national conferences. The majority of his papers regard clinical and translational research, with a particular focus on metastatic colorectal cancer. Dr Lisa Salvatore is a medical oncologist in the Department of Translational Research and New Technologies in Medicine and Surgery at the University of Pisa. She has been an author on about 40 publications in major peer-reviewed publications and has made numerous presentations in national and international conferences. Her main interest is focused on clinical and translational research in metastatic colorectal cancer
Mission profile assessment and alternative redesign of Milani scientific phases
No full textLAUREA MAGISTRALEIl 26 Settembre 2022, la sonda DART della NASA ha impattato con successo con Dimorphos, l’asteroide secondario del sistema binario Didymos, modificandone il periodo
orbitale rispetto all’asteroide primario. Questa missione fa parte della collaborazione internazionale Asteroid Impact and Deflection Assessment (AIDA) insieme con la sonda
Hera dell’Agenzia Spaziale Europea (ESA). Nell’ottobre 2024, Hera sarà lanciata verso il
sistema binario, dove rilascerà due CubeSats, Milani e Juventas. Questi contribuiranno
al miglioramento della caratterizzazione degli asteroidi e alla raccolta di dati scientifici.
Con l’arrivo di DART nei pressi del sistema binario, sono state catturate immagini ad
alta risoluzione che, in combinazione con le continue analisi sulle curve di luce, hanno
aggiornato i dati disponibili sulle dimensioni del sistema, i parametri orbitali e le masse.
Tuttavia, l’uso dei dati aggiornati potrebbe influenzare il profilo delle future missioni,
costituendo un motivo di preoccupazione in un ambiente già complesso come quello non Kepleriano attorno a un sistema binario di piccoli corpi celesti.
Il presente studio si dedica alla rivalutazione del profilo di missione del CubeSat Milani e
si concentra in particolare sulla riprogettazione della traiettoria per le fasi scientifiche. Il
loro design è fortemente vincolato sia dalla pianificazione delle manovre di Hera, che dai
propri requisiti scientifici che includono, tra gli altri, l’imaging degli asteroidi e del cratere
risultante dall’impatto con DART.
Dopo una panoramica dettagliata della missione e del sistema binario, la tesi si pone
l’obiettivo di valutare l’impatto dei nuovi dati sul profilo di missione e di fornire strategie
alternative per riprogettare entrambe le fasi scientifiche, ovvero a lungo, (FRP), e a corto
raggio, (CRP). La verifica della missione con i dati aggiornati costituisce una base per
affrontare un problema correlato: la progettazione di traiettorie soggette a forti vincoli in
un ambiente non-Kepleriano attorno a piccoli corpi celesti. Queste strategie innovative,
unite a un’analisi dei costi, illustreranno il potenziale degli approcci proposti nel fornire
soluzioni a basso costo e sicure per traiettorie così complesse.On the 26th of September 2022, NASA’s probe DART successfully impacted on Dimorphos,
the secondary asteroid of Didymos binary system, resulting in a change of its orbital period relative to the primary asteroid. This mission is part of the international Asteroid
Impact and Deflection Assessment (AIDA) collaboration in conjunction with the European Space Agency (ESA)’s Hera spacecraft.
In October 2024, the European counterpart is scheduled to be launched to the binary
system where it will also deploy two CubeSats, Milani and Juventas. They will rendezvous the asteroids to improve their characterization and provide valuable scientific
data.
Upon the arrival of DART to the binary system, it captured high-resolution images that,
in combination with the ongoing analysis of lightcurves, led to updated information regarding the system sizes, orbital parameters, and masses. These updates may drastically
impact on the mission profile of the upcoming spacecrafts, posing a further element of
concern in an already challenging non-Keplerian motion about a binary small-body environment.
Mindful of this, the current study is devoted to the assessment of the mission profile
of Milani CubeSat. Specifically, it addresses the trajectory design for scientific phases,
which are highly constrained by the manoeuvring schedule of Hera and by their own observational requirements, including the asteroids and crater imaging. After providing a
detailed overview of the mission and the Didymos system, the thesis evaluates the impact
of the new data and presents the alternative approaches implemented for the redesign of
both the Far-Range Phase (FRP) and Close-Range Phase (CRP). The mission assessment
serves as a foundation for addressing a related challenge: the design of highly constrained
trajectories in a small-body, non-Keplerian environment. These innovative strategies,
coupled with a comprehensive cost analysis, will illustrate the potential of the proposed
approaches in offering cost-effective and safe solutions for such complex trajectories
On the uncertainties in validating satellite instantaneous rainfall estimates with raingauge operational network
No full textIn the last decade, satellite precipitation estimation techniques have reached significant improvement in quantitative description of rainfall intensity and distribution, and even higher performances are expected from the full exploitation of Global Precipitation Measurement Mission. Parallel to the development of new techniques the need of accurate and reliable ground reference fields is also growing, for both calibrating and validating satellite algorithms. In the frame of the EUMETSAT’s Satellite Application Facility for the Support to Operational Hydrology and Water Management (H-SAF) different satellite estimation techniques are developed with the aim to provide instantaneous to 24h cumulated products to assist hydrological implementations, supported by a careful validation activity. Following the EUMETSAT guidelines, raingauges (and/or radar) have to be used as reference for satellite techniques validation. The different satellite and raingauge views of the precipitation field, however, pose several problems when they have to be compared: several factors cumulate each other throughout the matching process, resulting in large discrepancies between the two rainfall fields. In this work, we evaluate the impact of two of these factors in the satellite estimation validation process, taking advantage of the availability of locally-dense, high-resolution (1 minute) raingauge data over Italy. We first estimate the error due to the different time and spatial sampling between raingauges and satellite products (often referred as representativeness error), and then we evaluate the impact of raingauge density variations on the interpolated maps obtained by different techniques. Results show that a careful selection of the raingauge network density, time sampling, and raingauge interpolation algorithms can greatly reduce such matching errors that, however, can be very high. A Fractional Standard Error ranging from 100% to 300% between satellite estimate and raingauge reference value can be due to different raingauge sampling and interpolation strategy, while a reduction in the raingauge density of a factor of 2 leads to a degradation of the quality of the interpolation of about 40
RHM Author Interview: Dr. Lisa Melonçon, RHM Editor, Interviews Dr. Abby Dubisar and Sara Davis on Their Persuasion Brief, "Communicating Elective Sterilization: A Feminist Perspective"
No full textRHM Author Interview: Dr. Lisa Meloncon, RHM Editor, interviews Dr. Abby Dubisar and Sara Davis on Their Persuasion Brief, “Communicating Elective Sterilization: A Feminist Perspective.
Recommended from our members
Q & A with Lisa Duggan
No full textLisa Duggan is a Professor in American Studies at New York University. She was chair of this year's plenary session, which was entitled “Lesbian, Counter, and Queer: New Directions in the Study of Femininity.” She is author of Sapphic Slashers: Sex, Violence, and American Modernity, which won the John Boswell Prize of the American Historical Association in 2001. Her new book, The End of Marriage: The War over the Future of State Sponsored Love, will be published by University of California Press
- …
