Showing 117279–117292 of 117,463 results for "Michele Sassano"

Journals 2014 EN

The high-order Euler method and the spin-orbit model A fast algorithm for solving differential equations with small, smooth nonlinearity

Michele V. Bartuccelli · Jonathan H. B. Deane · Guido Gentile

We present an algorithm for the rapid numerical integration of smooth,time-periodic differential equations with small nonlinearity, particularlysuited to problems with small dissipation. The emphasis is on speed withoutcompromising accuracy and we envisage applications in problems whereintegration over long time scales is required; for instance, orbit probabilityestimation via Monte Carlo simulation. We demonstrate the effectiveness of ouralgorithm by applying it to the spin-orbit problem, for which we have derivedanalytical results for comparison with those that we obtain numerically. Amongother tests, we carry out a careful comparison of our numerical results withthe analytically predicted set of periodic orbits that exists for givenparameters. Further tests concern the long-term behaviour of solutions movingtowards the quasi-periodic attractor, and capture probabilities for theperiodic attractors computed from the formula of Goldreich and Peale. Weimplement the algorithm in standard double precision arithmetic and show thatthis is adequate to obtain an excellent measure of agreement between analyticalpredictions and the proposed fast algorithm.

Springer Science+Business Media
Download
Journals 2014 EN

Lessons from China: building technological capabilities for low carbon technology transfer and development

Jim Watson · Rob Byrne · David Ockwell +1 more

Using case study analysis across three sectors in China (cement, electric vehicles and coal fired electricity generation) and theoretical insights from the innovation studies literature, this paper analyses the development of China’s technological capabilities in low carbon technologies and the ways in which public policies have contributed to developing these capabilities. It finds that China has developed significant capabilities via a strategic approach. The paper’s findings have significant implications for international policies designed to support low carbon technology transfer to developing countries and broader processes of low carbon technological change and development. Such policies should go beyond the traditional focus on the transfer of technology hardware to focus on the development of low carbon technological capabilities in developing country firms.

Springer Science+Business Media
View
Journals 2014 EN

Effectiveness of Telaprevir and Boceprevir Triple Therapy for Patients with Hepatitis C Virus Infection in a Large Integrated Care Setting

Jennifer C. Price · Rosemary C. Murphy · Valentina Shvachko +2 more

In 2011, the FDA approved telaprevir (TVR) and boceprevir (BOC) for use with pegylated interferon and ribavirin to treat hepatitis C virus (HCV) genotype 1. We aimed to evaluate the real-world application, tolerability, and effectiveness of TVR- and BOC-based HCV treatment in a large integrated care setting.

Springer Science+Business Media
Download
Journals 2014 EN

Analyzing seasonal patterns of wildfire exposure factors in Sardinia, Italy

Michele Salis · Alan A. Ager · Fermín Alcasena +4 more

In this paper, we applied landscape scale wildfire simulation modeling to explore the spatiotemporal patterns of wildfire likelihood and intensity in the island of Sardinia (Italy). We also performed wildfire exposure analysis for selected highly valued resources on the island to identify areas characterized by high risk. We observed substantial variation in burn probability, fire size, and flame length among time periods within the fire season, which starts in early June and ends in late September. Peak burn probability and flame length were observed in late July. We found that patterns of wildfire likelihood and intensity were mainly related to spatiotemporal variation in ignition locations, fuel moisture, and wind vectors. Our modeling approach allowed consideration of historical patterns of winds, ignition locations, and live and dead fuel moisture on fire exposure factors. The methodology proposed can be useful for analyzing potential wildfire risk and effects at landscape scale, evaluating historical changes and future trends in wildfire exposure, as well as for addressing and informing fuel management and risk mitigation issues.

Springer Science+Business Media
Download
Journals 2014 EN

Re-testing the JET-X Flight Module No. 2 at the PANTER facility

Daniele Spiga · Gianpiero Tagliaferri · Paolo Soffitta +19 more

The Joint European X-ray Telescope (JET-X) was the core instrument of theRussian Spectrum-X-gamma space observatory. It consisted of two identical softX-ray (0.3 - 10 keV) telescopes with focusing optical modules having a measuredangular resolution of nearly 15 arcsec. Soon after the payload completion, themission was cancelled and the two optical flight modules (FM) were brought tothe Brera Astronomical Observatory where they had been manufactured. After 16years of storage, we have utilized the JET-X FM2 to test at the PANTER X-rayfacility a prototype of a novel X-ray polarimetric telescope, using a Gas PixelDetector (GPD) with polarimetric capabilities in the focal plane of the FM2.The GPD was developed by a collaboration between INFN-Pisa and INAF-IAPS. Inthe first phase of the test campaign, we have re-tested the FM2 at PANTER tohave an up-to-date characterization in terms of angular resolution andeffective area, while in the second part of the test the GPD has been placed inthe focal plane of the FM2. In this paper we report the results of the tests ofthe sole FM2, using an unpolarized X-ray source, comparing the results with thecalibration done in 1996.

Springer Science+Business Media
Download
Journals 2014 EN

Stability properties and topology at infinity of f-minimal hypersurfaces

Debora Impera · Michele Rimoldi

We study stability properties of $f$-minimal hypersurfaces isometricallyimmersed in weighted manifolds with non-negative Bakry-Emery Ricci curvatureunder volume growth conditions. Moreover, exploiting a weighted version of afiniteness result and the adaptation to this setting of Li-Tam theory, weinvestigate the topology at infinity of $f$-minimal hypersurfaces. On the way,we prove a new comparison result in weighted geometry and we provide a generalweighted $L^1$-Sobolev inequality for hypersurfaces in Cartan-Hadamard weightedmanifolds, satisfying suitable restrictions on the weight function.

Springer Science+Business Media
Download
Journals 2014 EN

Space-based detectors

Alberto Sesana · W. J. Weber · C. J. Killow +37 more

The parallel session C5 on Space-Based Detectors gave a broad overview over the planned space missions related to gravitational wave detection. Overviews of the revolutionary science to be expected from LISA was given by Alberto Sesana and Sasha Buchman. The launch of LISA Pathfinder (LPF) is planned for 2015. This mission and its payload “LISA Technology Package” will demonstrate key technologies for LISA. In this context, reference masses in free fall for LISA, and gravitational physics in general, was described by William Weber, laser interferometry at the pico-metre level and the optical bench of LPF was presented by Christian Killow and the performance of the LPF optical metrology system by Paul McNamara. While LPF will not yet be sensitive to gravitational waves, it may nevertheless be used to explore fundamental physics questions, which was discussed by Michele Armano. Some parts of the LISA technology that are not going to be demonstrated by LPF, but under intensive development at the moment, were presented by Oliver Jennrich and Oliver Gerberding. Looking into the future, Japan is studying the design of a mid-frequency detector called DECIGO, which was discussed by Tomotada Akutsu. Using atom interferometry for gravitational wave detection has also been recently proposed, and it was critically reviewed by Peter Bender. In the nearer future, the launch of GRACE Follow-On (for Earth gravity observation) is scheduled for 2017, and it will include a Laser Ranging Interferometer as technology demonstrator. This will be the first inter-spacecraft laser interferometer and has many aspects in common with the LISA long arm, as discussed by Andrew Sutton

Springer Science+Business Media
Download
Journals 2014 EN

Noise in oscillators: a review of state space decomposition approaches

Fabio L. Traversa · Michele Bonnin · Fernando Corinto +1 more

We review the state space decomposition techniques for the assessment of thenoise properties of autonomous oscillators, a topic of great practical andtheoretical importance for many applications in many different fields, fromelectronics, to optics, to biology. After presenting a rigorous definition ofphase, given in terms of the autonomous system isochrons, we provide ageneralized projection technique that allows to decompose the oscillatorfluctuations in terms of phase and amplitude noise, pointing out that the verydefinition of phase (and orbital) deviations depends of the base chosen todefine the aforementioned projection. After reviewing the most advancedtheories for phase noise, based on the use of the Floquet basis and of thereduction of the projected model by neglecting the orbital fluctuations, wediscuss the intricacies of the phase reduction process pointing out thepresence of possible variations of the noisy oscillator frequency due toamplitude-related effects.

Springer Science+Business Media
Download