CERN Accelerating science

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2016-09-26
17:46
Case study of a magnetic system for low-energy machines / Schoerling, Daniel (CERN)
The extra low-energy antiproton ring (ELENA) is a CERN particle decelerator with the purpose to deliver antiprotons at lowest energies aiming to enhance the study of antimatter. The hexagonal shaped ring with a circumference of about 30 m will decelerate antiprotons from momenta of 100 to 13.7 MeV/c. [...]
CERN-ACC-2016-0114.- Geneva : CERN, 2016 - 17 p. - Published in : Phys. Rev. Spec. Top. Accel. Beams 19 (2016) 1-17 Fulltext: PDF;

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2016-09-26
07:24
Printable Nanoscopic Metamaterial Absorbers and Images with Diffraction-Limited Resolution / Richner, Patrizia ; Eghlidi, Hadi ; Kress, Stephan J P ; Schmid, Martin ; Norris, David J ; Poulikakos, Dimos
The fabrication of functional metamaterials with extreme feature resolution finds a host of applications such as the broad area of surface/light interaction. Non-planar features of such structures can significantly enhance their performance and tunability, but their facile generation remains a challenge. [...]
arXiv:1609.07328.- 2016 - Published in : ACS applied materials & interfaces 8 (2016) 11690-11697 External link: Preprint

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2016-09-26
07:22
Variational techniques in general relativity: A metric-affine approach to Kaluza's theory / Massa, Enrico ; Vignolo, Stefano
A new variational principle for General Relativity, based on an action functional $I\/(\Phi,\nabla)\/$ involving both the metric $\Phi\/$ and the connection $\nabla\/$ as independent, \emph{unconstrained\/} degrees of freedom is presented. The extremals of $I\/$ are seen to be pairs $\/(\Phi,\nabla)\/$ in which $\Phi\/$ is a Ricci flat metric, and $\nabla\/$ is the associated Riemannian connection. [...]
arXiv:1609.07447.- 2016 - Published in : J. Math. Phys. (Woodbury, NY) 48 (2007) 022501 External link: Preprint

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2016-09-26
07:22
A vielbein formulation of unified Einstein-Maxwell theory / Vignolo, Stefano ; Massa, Enrico
In the framework of J-bundles a vielbein formulation of unified Einstein-Maxwell theory is proposed. In the resulting scheme, field equations matching the gravitational and electromagnetic fields are derived by constraining a five-dimensional variational principle. [...]
arXiv:1609.07442.- 2016 - Published in : Class. Quantum Gravity 23 (2006) 6781-6791 External link: Preprint

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2016-09-26
07:22
Analytic treatment of the system of a Kerr-Newman black hole and a charged massive scalar field / Hod, Shahar
Charged rotating Kerr-Newman black holes are known to be superradiantly unstable to perturbations of charged massive bosonic fields whose proper frequencies lie in the bounded regime $0 < \omega < \text{min} \{\omega_{\text{c}} \equiv m \Omega_{\text{H}} + q\Phi_{\text{H}},\mu\}$ [here $\{\Omega_{\text{H}}, \Phi_{\text{H}}\}$ are respectively the angular velocity and electric potential of the Kerr-Newman black hole, and $\{m,q,\mu\}$ are respectively the azimuthal harmonic index, the charge coupling constant, and the proper mass of the field]. In this paper we study analytically the complex resonance spectrum which characterizes the dynamics of linearized charged massive scalar fields in a near-extremal Kerr-Newman black-hole spacetime. [...]
arXiv:1609.07146.- 2016 - 11 p. - Published in : Phys. Rev. D 94 (2016) 044036 External link: Preprint

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2016-09-26
07:22
The Chandra Survey of Extragalactic Sources in the 3CR Catalog: X-ray Emission from Nuclei, Jets, and Hotspots in the Chandra Archival Observations / Massaro, F (UniTO, INFN-TO) ; Harris, D E (SAO) ; Liuzzo, E (INAF-IRA) ; Orienti, M (INAF-IRA) ; Paladino, R (INAF-IRA) ; Paggi, A (SAO) ; Tremblay, G R (Yale) ; Wilkes, B J (SAO) ; Kuraszkiewicz, J (SAO) ; Baum, S A (Univ. Manitoba) et al.
As part of our program to build a complete radio and X-ray database of all the 3CR extragalactic radio sources, we present an analysis of 93 sources for which Chandra archival data are available. Most of these sources have been already published. [...]
arXiv:1609.07145.- 2016 - 19 p. - Published in : Astrophys. J. Suppl. Ser. 220 (2015) 5 External link: Preprint

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2016-09-23
09:10
Deformation and fracture of echinoderm collagen networks / Ovaska, Markus ; Bertalan, Zsolt ; Miksic, Amandine ; Sugni, Michela ; Di Benedetto, Cristiano ; Ferrario, Cinzia ; Leggio, Livio ; Guidetti, Luca ; Alava, Mikko J ; La Porta, Caterina A M et al.
Collagen networks provide the main structural component of most tissues and represent an important ingredient for bio-mimetic materials for bio-medical applications. Here we study the mechanical properties of stiff collagen networks derived from three different echinoderms and show that they exhibit non-linear stiffening followed by brittle fracture. [...]
arXiv:1609.06847.- 2016 - Published in : Journal of the Mechanical Behavior of Biomedical Materials 65 (2017) 42 External link: Preprint

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2016-09-23
09:10
Fluctuations in protein aggregation: Design of preclinical screening for early diagnosis of neurodegenerative disease / Costantini, Giulio ; Budrikis, Zoe ; Taloni, Alessandro ; Buell, Alexander K ; Zapperi, Stefano ; La Porta, Caterina A M
Autocatalytic fibril nucleation has recently been proposed to be a determining factor for the spread of neurodegenerative diseases, but the same process could also be exploited to amplify minute quantities of protein aggregates in a diagnostic context. Recent advances in microfluidic technology allow analysis of protein aggregation in micron-scale samples potentially enabling such diagnostic approaches, but the theoretical foundations for the analysis and interpretation of such data are so far lacking. [...]
arXiv:1609.06843.- 2016 - Published in : Phys. Rev. Applied: 6 (2016) , pp. 034012 External link: Preprint

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2016-09-23
09:10
Carbon cluster diagnostics-I: Direct Recoil Spectroscopy (DRS) of Ar+ and Kr+ bombarded graphite / Ahmad, Shoaib ; Akhtar, M N ; Qayyum, A ; Ahmad, B ; Bahar, K ; Arshed, W
Measurements of the energy spectra of multiply charged positive and negative carbon ions recoiling from graphite surface under 100 and 150 keV argon and krypton ion bombardment are presented. With the energy spectrometer set at recoil angle of 79.5 degrees, direct recoil (DR) peaks have been observed with singly as well as multiply charged carbon ions , where n = 1 to 6. [...]
arXiv:1609.06746.- 2016 - 9 p. - Published in : Nuclear Instruments and Methods in Physics Research B: 122 (1997) , pp. 19 External link: Preprint

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2016-09-23
09:10
Two New Theories for the Current Charge Relativity and the Electric Origin of the Magnetic Force Between Two Filamentary Current Elements / Shadid, Waseem G T
This paper presents two new theories and a new current representation to explain the magnetic force between two filamentary current elements as a result of electric force interactions between current charges. The first theory states that a current has an electric charge relative to its moving observer. [...]
arXiv:1609.06731.- 2016 - 24 p. - Published in : IEEE Access, vol. 4, no. , pp. 4509-4533, 2016 External link: Preprint

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