7,111 research outputs found
How Many Templates for GW Chirp Detection? The Minimal-Match Issue Revisited
In a recent paper dealing with maximum likelihood detection of gravitational
wave chirps from coalescing binaries with unknown parameters we introduced an
accurate representation of the no-signal cumulative distribution of the
supremum of the whole correlator bank. This result can be used to derive a
refined estimate of the number of templates yielding the best tradeoff between
detector's performance (in terms of lost signals among those potentially
detectable) and computational burden.Comment: submitted to Class. Quantum Grav. Typing error in eq. (4.8) fixed;
figure replaced in version
Surface roughness effect on ultracold neutron interaction with a wall and implications for computer simulations
We review the diffuse scattering and the loss coefficient in ultracold
neutron reflection from slightly rough surfaces, report a surprising reduction
in loss coefficient due to roughness, and discuss the possibility of transition
from quantum treatment to ray optics. The results are used in a computer
simulation of neutron storage in a recent neutron lifetime experiment that
re-ported a large discrepancy of neutron lifetime with the current particle
data value. Our partial re-analysis suggests the possibility of systematic
effects that were not included in this publication.Comment: 39 pages, 9 figures; additional calculations include
High-resolution periodic mode shapes identification for wind turbines
The stability analysis of in-operation wind turbines is a very important topic, that has received considerable attention in the last years. Many identification algorithms have been developed to estimate frequencies and damping ratios, but very few papers have been dedicated to the mode shapes. The knowledge of high-resolution mode shapes could be exploited for several applications including model validation, accurate description of the vibratory content of a machine and spatially-accurate damage detection. In this work, we will present a procedure to compute the high-resolution periodic mode shapes of a wind turbine, and apply it to a high-fidelity wind turbine model. The results show that this methodology is able to identify the first low-damped modes of the system with good accuracy
Romano, Santi
Santi Romano was born in Palermo, Sicily on January 31, 1875. His origins had a notable impact on his legal training, as Palermo was the cradle of a host of renewed legal studies that changed once and for all the way of approaching public law in Italy. His teacher, Vittorio Emanuele Orlando, was both a leading statesman and an innovator of the notion and practice of public and administrative law. The young Romano contributed to a seminal collection of volumes, edited by Orlando, devoted to Italian administrative law, Primo trattato completo di diritto amministrativo italiano (First Complete Treatise on Italian Administrative Law), published between 1900 and 1915. The importance Orlando and his many collaborators attached to such a monumental scholarly enterprise should not go unnoticed: in his preface to the first volume, Orlando emphasized his and the other contributors’ conscious, and eventually successful, attempt at constructing an Italian school of public law. This collection of writings, he claimed, was the necessary counterpoint to the growing expansion of the state’s competences in the public realm. While in the past,
Italian scholars had been heavily influenced by the French lawyers who had been working and mulling over the Code Napoléon and, subsequently, by the German pandectists, Orlando insisted that the specialization and evolution of
the Italian state called for a full-fledged “homegrown” scholarly apparatus. After obtaining his degree at the University of Palermo, Romano wholeheartedly adhered to this ambitious project
Resurgence of Bundling Mechanisms in Digital Services Trade
The expansion of trade through centuries was pushed through a great extent by the unbundling of commodities from various factors that prevent them from being traded globally. The use of the steam engine in shipping, for example, ushered in the rapid expansion of 19th-century trade as transport cost was drastically reduced and countries realized interspatial cost differences across the Atlantic. The previous untradability of services, on the other hand, was broken by various dimensions of globalization that separated the simultaneous production and consumption of services. This unbundling rapidly boosted global trade in recent decades. However, growing developments and innovations in ICT are creating new bundling mechanisms. The essay will identify how these new bundling mechanisms have emerged and their implications on services trade and other dimensions of human development
Rotating Electromagnetic Waves in Toroid-Shaped Regions
Electromagnetic waves, solving the full set of Maxwell equations in vacuum,
are numerically computed. These waves occupy a fixed bounded region of the
three dimensional space, topologically equivalent to a toroid. Thus, their
fluid dynamics analogs are vortex rings. An analysis of the shape of the
sections of the rings, depending on the angular speed of rotation and the major
diameter, is carried out. Successively, spherical electromagnetic vortex rings
of Hill's type are taken into consideration. For some interesting peculiar
configurations, explicit numerical solutions are exhibited.Comment: 27 pages, 40 figure
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