34,911 research outputs found
Images of U.P. Levy
No full textThree portraits of Levy, two identical portraits, one signed by Levy, "Captain, USN," showing him as a man in his mid-fifties, sitting and smiling. Another full frontal portrait features Levy in full naval uniform holding a sword in his left hand and a scroll in his right which reads: “Author of the Abolition of Flogging in the Navy of the U.S.” On the wall behind Levy is another portrait of two vessels, underneath which "Commodore Uriah Phillips Levy, 1792-1862" is inscribed. Presented to the Naval Academy by Mrs. Carl von Mayhoff.Digital ImageDigital finding aid available
The Levy sections theorem revisited
No full textThis paper revisits the Levy sections theorem. We extend the scope of the theorem to time series and apply it to historical daily returns of selected dollar exchange rates. The elevated kurtosis usually observed in such series is then explained by their volatility patterns. And the duration of exchange rate pegs explains the extra elevated kurtosis in the exchange rates of emerging markets. In the end our extension of the theorem provides an approach that is simpler than the more common explicit modeling of fat tails and dependence. Our main purpose is to build up a technique based on the sections that allows one to artificially remove the fat tails and dependence present in a data set. By analyzing data through the lenses of the Levy sections theorem one can find common patterns in otherwise very different data sets.Econophysics; Levy sections
"Overcoming America's Infrastructure Deficit, A Fiscally Responsible Plan for Public Capital Investment"
No full textCondemned bridges, dilapidated school buildings, contaminated water supplies, and other infrastructure shortcomings threaten American growth, productivity, and prosperity. S Jay Levy and Walter M. Cadette propose a plan for financing infrastructure projects that is designed to have minimal effect on the federal budget and to promote sound fiscal operation. Federal zero-interest mortgage loans to state and local governments for capital projects specified by Congress can cut the cost of such projects, achieve needed improvements in the nation's infrastructure, and thereby contribute to the American economy's future.
Providence College Faculty Author Series 2017-2018: Ian Levy
No full textIn this installment of the Faculty Authors Series, Ian Levy (Theology, Providence College) discusses his newest book, Introducing Medieval Biblical Interpretation: The Senses of Scripture in Premodern Exegesis
Website Review: The Leon Levy Dead Sea Scrolls Digital Library
No full textThe author reviews the Leon Levy Dead Sea Scrolls Digital Library website
Levy foraging in a dynamic environment - Extending the Levy search
No full textA common task for robots is the patrolling of an unknown area with inadequate information about target locations. Under these circumstances it has been suggested that animal foraging could provide an optimal or at least suboptimal search methodology, namely the Levy flight search. Although still in debate, it seems that predators somehow follow this search pattern when foraging, because it avoids being trapped in a local search if the food is beyond the sensory range. A Levy flight is a particular case of the random walk. Its displacements on a 2-D surface are drawn from the Pareto-Levy probability distribution, characterized by power law tails. The Levy flight search has many applications in optical material, ladars, optics, large database search, earthquake data analysis, location of DNA sites, human mobility, stock return analysis, online auctions, astronomy, ecology and biology. Almost all studies and simulations concerning the Levy flight foraging examine static or slowly moving (with respect to the forager) uniformly distributed resources. Moreover, in recent works a small swarm of underwater autonomous vehicles has been used to test the standard Levy search in the underwater environment, with good results. In this paper we extend the classical Levy foraging framework taking into consideration a moving target allocated on a 2- D surface according to a radial probability distribution and comparing its performance with the random walk search. The metric used in the numerical simulations is the detection rate. Simulations include the sensor resolution, intended as the maximum detection distance of the forager from the target. Furthermore, contrarily to the usual Levy foraging framework, we use only one target. Results show that Levy flight outperforms the random walk if the sensor detection radius is not too small or too large. We also find the Levy flight in the velocity of the center of mass model of a fish school according the Kuramoto equation, a famous model of synchronization phenomena. Finally, a discussion about the controversy concerning the innate or evolutionary origin of the Levy foraging is given. © 2015 Author(s). Licensee InTech
Providence College Faculty Author Series 2017-2018: Ian Levy
No full textIn this installment of the Faculty Authors Series, Ian Levy (Theology, Providence College) discusses his newest book, Introducing Medieval Biblical Interpretation: The Senses of Scripture in Premodern Exegesis
Levy noise effects on Josephson junctions
No full textWe review three different approaches to investigate the non-equilibrium stochastic dynamics of a Josephson junction affected by Levy-distributed current fluctuations. First, we study the lifetime in the metastable superconducting state of current-biased short and long junctions, in the presence of Gaussian and Levy noise sources. We highlight the noise-induced nonmonotonic behavior of the mean switching time as a function of noise intensity and driving frequency, that is the noise enhanced stability and the stochastic resonant activation, respectively. Then, we characterize the Levy noise source through the average voltage drop across a current-biased junction. The voltage measurement versus the noise intensity allows to infer the value of the stability index that characterizes Levy-distributed fluctuations. The numerical calculation of the average voltage drop across the junction well agrees with the analytical estimate of the average velocity for Levy-driven escape processes from a metastable state. Finally, we look at the distribution of switching currents out of the zero-voltage state, when a Levy noise signal is added to a linearly ramped bias current. The analysis of the cumulative distribution function of the switching currents gives information on both the Levy stability index and the intensity of fluctuations. We present also a theoretical model to catch the features of the Levy signal from a measured distribution of switching currents. The phenomena discussed in this work can pave the way for an effective and reliable Josephson-based scheme to characterize Levy components eventually embedded in an unknown noisy signal. (c) 2021 Elsevier Ltd. All rights reserved
The Impacts of the Climate Change Levy on business: Evidence from Microdata
No full textWe estimate the impacts of the Climate Change Levy (CCL) on manufacturing plants using panel data from the UK production census. Our identification strategy builds on the comparison of outcomes between plants subject to the CCL and plants that were granted an 80% discount on the levy after joining a Climate Change Agreement (CCA). Exploiting exogenous variation in eligibility for CCA participation, we find that the CCL had a strong negative impact on energy intensity and electricity use. We cannot reject the hypothesis that the tax had no detrimental effects on economic performance and on plant exit.Climate policy, carbon tax, United Kingdom, manufacturing, impact assessment
The Impacts of the Climate Change Levy on Manufacturing: Evidence from Microdata
No full textWe estimate the impacts of the Climate Change Levy (CCL) on manufacturing plants using panel data from the UK production census. Our identification strategy builds on the comparison of outcomes between plants subject to the CCL and plants that were granted an 80% discount on the levy after joining a Climate Change Agreement (CCA). Exploiting exogenous variation in eligibility for CCA participation, we find that the CCL had a strong negative impact on energy intensity and electricity use. We cannot reject the hypothesis that the tax had no detrimental effects on economic performance and on plant exit.
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