Zobrazeno 1 - 10
of 268
pro vyhledávání: '"J. Frederico"'
Autor:
A. Doche, C. Beekman, S. Corde, J. M. Allen, C. I. Clarke, J. Frederico, S. J. Gessner, S. Z. Green, M. J. Hogan, B. O’Shea, V. Yakimenko, W. An, C. E. Clayton, C. Joshi, K. A. Marsh, W. B. Mori, N. Vafaei-Najafabadi, M. D. Litos, E. Adli, C. A. Lindstrøm, W. Lu
Publikováno v:
Scientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
Abstract High gradients of energy gain and high energy efficiency are necessary parameters for compact, cost-efficient and high-energy particle colliders. Plasma Wakefield Accelerators (PWFA) offer both, making them attractive candidates for next-gen
Externí odkaz:
https://doaj.org/article/1190e253be4841319afdf1ef172e95fd
Autor:
C. E. Clayton, E. Adli, J. Allen, W. An, C. I. Clarke, S. Corde, J. Frederico, S. Gessner, S. Z. Green, M. J. Hogan, C. Joshi, M. Litos, W. Lu, K. A. Marsh, W. B. Mori, N. Vafaei-Najafabadi, X. Xu, V. Yakimenko
Publikováno v:
Nature Communications, Vol 7, Iss 1, Pp 1-7 (2016)
Extraction of ultra-low emittance bunches is an issue to be addressed for future applications of plasma wakefield accelerators. Here, the authors show that the field structure of the plasma could be suitable for this, by measuring the field's longitu
Externí odkaz:
https://doaj.org/article/d14afa3aa0924f57954223b80096ebee
Autor:
S. Corde, E. Adli, J. M. Allen, W. An, C. I. Clarke, B. Clausse, C. E. Clayton, J. P. Delahaye, J. Frederico, S. Gessner, S. Z. Green, M. J. Hogan, C. Joshi, M. Litos, W. Lu, K. A. Marsh, W. B. Mori, N. Vafaei-Najafabadi, D. Walz, V. Yakimenko
Publikováno v:
Nature Communications, Vol 7, Iss 1, Pp 1-6 (2016)
Plasma accelerators driven by particle beams are a promising technology, but the acceleration distance and energy gain are strongly limited by head erosion in a high-ionization-potential gas. Here the authors observe up to 130% energy boost in a self
Externí odkaz:
https://doaj.org/article/c3a1959eb86047b0b2e79b6251b5b454
Publikováno v:
PeerJ Computer Science, Vol 4, p e153 (2018)
We describe the Coefficient-Flow algorithm for calculating the bounding chain of an $(n-1)$-boundary on an $n$-manifold-like simplicial complex $S$. We prove its correctness and show that it has a computational time complexity of O(|S(n−1)|) (where
Externí odkaz:
https://doaj.org/article/d26316aee9594836acf8f006c2ad9b24
Autor:
J. Frederico Marques
Publikováno v:
Behavioural Neurology, Vol 26, Iss 3, Pp 203-205 (2013)
Data from neuropsychological research suggest that categorizing objects at different levels of specificity requires different cognitive and neural processes. This short paper presents and discusses a theoretical hypothesis for this organization in te
Externí odkaz:
https://doaj.org/article/54c25eedb728499db63f022786c09498
Autor:
N. Vafaei-Najafabadi, K. A. Marsh, C. E. Clayton, W. An, W. B. Mori, C. Joshi, W. Lu, E. Adli, S. Corde, C. I. Clarke, M. Litos, S. Z. Green, S. Gessner, J. Frederico, A. S. Fisher, Z. Wu, D. Walz, M. J. Hogan
Publikováno v:
Physical Review Accelerators and Beams, Vol 19, Iss 10, p 101303 (2016)
We have investigated the viability of using plasmas formed by ionization of high Z, low ionization potential element rubidium (Rb) for beam-driven plasma wakefield acceleration. The Rb vapor column confined by argon (Ar) buffer gas was used to reduce
Externí odkaz:
https://doaj.org/article/15c6bd48c6124563a54ec6fafecac2cf
Deformable objects present a formidable challenge for robotic manipulation due to the lack of canonical low-dimensional representations and the difficulty of capturing, predicting, and controlling such objects. We construct compact topological repres
Externí odkaz:
http://arxiv.org/abs/2011.11693
Optimizing parameters with momentum, normalizing data values, and using rectified linear units (ReLUs) are popular choices in neural network (NN) regression. Although ReLUs are popular, they can collapse to a constant function and "die", effectively
Externí odkaz:
http://arxiv.org/abs/2005.06195
In this work we propose algorithms to explicitly construct a conservative estimate of the configuration spaces of rigid objects in 2D and 3D. Our approach is able to detect compact path components and narrow passages in configuration space which are
Externí odkaz:
http://arxiv.org/abs/2002.02715
Autor:
W. An, M. Zhou, N. Vafaei-Najafabadi, K. A. Marsh, C. E. Clayton, C. Joshi, W. B. Mori, W. Lu, E. Adli, S. Corde, M. Litos, S. Li, S. Gessner, J. Frederico, M. J. Hogan, D. Walz, J. England, J. P. Delahaye, P. Muggli
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 16, Iss 10, p 101301 (2013)
Strategies for mitigating ionization-induced beam head erosion in an electron-beam-driven plasma wakefield accelerator (PWFA) are explored when the plasma and the wake are both formed by the transverse electric field of the beam itself. Beam head ero
Externí odkaz:
https://doaj.org/article/d227e07452b24a56907845c6e05f797e