cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On d-dimensional d-Semimetrics and Simplex-Type Inequalities for High-Dimensional Sine Functions
Creators: name: Lerman, Gilad
name: Whitehouse, Jonathan Tyler
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 46C05, 52C99, 39B05, 60D05, 42B99

description: We show that high-dimensional analogues of the sine function (more precisely, the d-dimensional polar sine and the d-th root of the d-dimensional hypersine) satisfy a simplex-type inequality in a real pre-Hilbert space H. Adopting the language of Deza and Rosenberg, we say that these d-dimensional sine functions are d-semimetrics. We also establish geometric identities for both the d-dimensional polar sine and the d-dimensional hypersine. We then show that when d=1 the underlying functional equation of the corresponding identity characterizes a generalized sine function. Finally, we show that the d-dimensional polar sine satisfies a relaxed simplex inequality of two controlling terms "with high probability".
description: 22 pages and 2 figures, updated to reflect publication in JAT and the DOI
Slingshot prominences: a hidden mass loss mechanism
Creators: name: Waugh, Rose F. P.
name: Jardine, Moira M.
name: Morin, Julien
name: Donati, Jean-Francois
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Whilst ``slingshot'' prominences have been observed on M-dwarfs, most if not all theoretical studies have focused on solar-like stars. We present an investigation into stellar prominences around rapidly rotating young M-dwarfs. We have extrapolated the magnetic field in the corona from Zeeman-Doppler maps and determined the sites of mechanical stability where prominences may form. We analyse the prominence mass that could be supported and the latitude range over which this material is distributed. We find that for these maps, much of this prominence mass may be invisible to observation - typically <1\% transits the stellar disc. On the rapidly-rotating M-dwarf V374 Peg (P$_{\rm rot}$ = 0.45 days) where prominences have been observed, we find the visible prominence mass to be around only 10\% of the total mass supported. The mass loss rate per unit area for prominences scales with the X-ray surface flux as $\dot{M}/A \propto$ $F_X^{1.32}$ which is very close to the observationally-derived value for stellar winds. This suggests that prominence ejection may contribute significantly to the overall stellar wind loss and spin down. A planet in an equatorial orbit in the habitable zone of these stars may experience intermittent enhancements of the stellar wind due to prominence ejections. On some stars, this may occur throughout 20\% of the orbit.
description: 13 pages, 10 figures
Deep-UV-enhanced supercontinuum generated in tapered gas-filled photonic crystal fiber
Creators: name: Suresh, Mallika Irene
name: Hammer, Jonas
name: Joly, Nicolas Y.
name: Russell, Philip St. J.
name: Tani, Francesco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present the use of linearly down-tapered gas-filled hollow-core photonic crystal fiber in a single-stage, pumped with pulses from a compact infrared laser source, to generate a supercontinuum carrying significant spectral power in the deep ultraviolet (200 - 300 nm). The generated supercontinuum extends from the near infrared down to around 213 nm with up to 0.83 mW/nm in the deep ultraviolet.
description: 4 pages (+1 page for full reference list), 3 figures
Testing backreaction effects with observations
Creators: name: Larena, Julien
name: Alimi, Jean--Michel
name: Buchert, Thomas
name: Kunz, Martin
name: Corasaniti, Pier-Stefano
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In order to quantitatively test the ability of averaged inhomogeneous cosmologies to correctly describe observations of the large scale properties of the Universe, we introduce a smoothed template metric corresponding to a constant spatial curvature model at any time, but with an evolving curvature parameter. This metric is used to compute quantities along an approximate effective lightcone of the averaged model of the Universe. As opposed to the standard Friedmann model, we parameterize this template metric by exact scaling properties of an averaged inhomogeneous cosmology, and we also motivate this form of the metric by results on a geometrical smoothing of inhomogeneous cosmological hypersurfaces. We test our hypothesis for the template metric against supernova data and the position of the CMB peaks, and infer the goodness--of--fit and parameter uncertainties. We find that averaged inhomogeneous models can reproduce the observations without requiring an additional Dark Energy component (though a volume acceleration is still needed), and that current data do not disfavour our main assumption on the effective lightcone structure. We also show that the experimental uncertainties on the angular diameter distance and the Hubble parameter from Baryon Acoustic Oscillations measurements -- forseen in future surveys like the proposed EUCLID satellite project -- are sufficiently small to distinguish between a FLRW template geometry and the template geometry with consistently evolving curvature. (Abridged)
description: 27 pages; new version with a corrected way to compute the redshifts; conclusions remain unchanged
CONSERVATION STRATEGIES FOR FLORA
Creators: name: CHETNA JYOTI
Publisher: name: Zenodo
Year: 2021
Subjects: Conservation, flora, gene banks, sustainable use, In situ , ex situ.

description: CONSERVATION STATEGIES FOR FLORA Chetna Jyoti Ph.D scholar IARI out reach campus ICAR IIHR. World flora online colloquium consist of various institute at global level to prepare a World flora online and Global tree assessment for conservation database for trees at world level.It isuniform for aptitude building programme, educating and making public awareness among different levels from local level to international level about conservation. It is based on simplecitizen sciences programme and social media platform. Its target is to provide clear, stable, long term goals for conservation of native flora at world level. Various maneuvering include generation and disposalof knowledge, in situ and ex situ conservation, restoration of debase ecosystems. Forestall and control of threats, protract use, local culture programs including participation of governmental, nongovernmentalorganizations, research associates for providing information illustrating diversity of botanical gardens and plant conservation activities. In situ conservation includes natural ecosystem and habitats and traditional conservation approach in case of wild species while ex situ approach includes field gene bank, seed bank, in vitro gene bank, cryo gene bank, pollen bank and DNA bank. Also scientific newscast and old documents of native floraact asavailableliterature for documentation.It is important for subsistence management of plant genetic resources and provide a practical measures for the reinstatement and rational use of various ecosystem. India a network of 668 protected areas has been established consisting of 102 national parks, 515 wild life sanctuaries, 47 conservation reserves and 4 community reserves by forming Global Biodiversity Frame Work, Global Strategy for Plant Conservation etc., for knowledge, conservation, restoration and sustainable use. Thus plant conservation is a broad group of activities which aims to prevent plants from becoming extinct. Key words:- Conservation, flora, gene banks, sustainable use, In situ , ex situ.
Cavity-Assisted Back Action Cooling of Mechanical Resonators
Creators: name: Wilson-Rae, I.
name: Nooshi, N.
name: Dobrindt, J.
name: Kippenberg, T. J.
name: Zwerger, W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We analyze the quantum regime of the dynamical backaction cooling of a mechanical resonator assisted by a driven harmonic oscillator (cavity). Our treatment applies to both optomechanical and electromechanical realizations and includes the effect of thermal noise in the driven oscillator. In the perturbative case, we derive the corresponding motional master equation using the Nakajima-Zwanzig formalism and calculate the corresponding output spectrum for the optomechanical case. Then we analyze the strong optomechanical coupling regime in the limit of small cavity linewidth. Finally we consider the steady state covariance matrix of the two coupled oscillators for arbitrary input power and obtain an analytical expression for the final mechanical occupancy. This is used to optimize the drive's detuning and input power for an experimentally relevant range of parameters that includes the "ground state cooling" regime.
description: 20 pages, 4 figures
Antiphase Stripe Order as the Origin of Electron Pockets Observed in 1/8-Hole-Doped Cuprates
Creators: name: Millis, A. J.
name: Norman, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Recent quantum oscillation measurements on underdoped cuprates are shown to be consistent with the predictions of a mean field theory of the 1/8 magnetic antiphase stripe order proposed to occur in high-$T_c$ cuprates. In particular, for intermediate values of the stripe order parameter, the magneto-transport is found to be dominated by an electron pocket.
Gemini Observations of Disks and Jets in Young Stellar Objects and in Active Galaxies
Creators: name: McGregor, Peter
name: Dopita, Michael
name: Sutherland, Ralph
name: Beck, Tracy
name: Storchi-Bergmann, Thaisa
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present first results from the Near-infrared Integral Field Spectrograph (NIFS) located at Gemini North. For the active galaxies Cygnus A and Perseus A we observe rotationally-supported accretion disks and adduce the existence of massive central black holes and estimate their masses. In Cygnus A we also see remarkable high-excitation ionization cones dominated by photoionization from the central engine. In the T-Tauri stars HV Tau C and DG Tau we see highly-collimated bipolar outflows in the [Fe II] 1.644 micron line, surrounded by a slower molecular bipolar outflow seen in the H_2 lines, in accordance with the model advocated by Pyo et al. (2002).
description: Invited paper presented at the 5th Stromlo Symposium. 9 pages, 7 figures. Accepted for publication in Astrophysics & Space Science
Photoemission signatures of valence-bond stripes in cuprates: Long-range vs. short-range order
Creators: name: Wollny, Alexander
name: Vojta, Matthias
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Recent experiments indicate that the tendency toward the formation of unidirectional charge density waves ("stripes") is common to various underdoped cuprates. We discuss momentum-resolved spectral properties of valence-bond stripes, comparing the situations of ideal and short-range stripe order, the latter being relevant for weak and/or disorder-pinned stripes. We find clear signatures of ordered stripes, although matrix element effects suppress most shadow band features. With decreasing stripe correlation length, stripe signatures are quickly washed out, the only remaining effect being a broadening of antinodal quasiparticles. This insensitivity of photoemission to short-range stripe order may be employed to distinguish it from nematic order, e.g. in underdoped YBCO.
description: 6 pages, 6 figs, proceedings of SCES'08
MORPHOLOGICAL AND PHENOLOGICAL CHARACTERIZTION OF LOCAL CHIRONJI (Buchanania lanzan Spreng)) GENOTYPES
Creators: name: SANAP C B
name: DR DIPAKKUMAR BAKARAM AHIRE
Publisher: name: Zenodo
Year: 2021
Subjects: CHIRONJI, GENOTYPE, DHADGOAN, MORPHOLOGICAL, PHENOLOGICAL

description: ABSTRACT The knowledge of plant growth pattern, leaf morphology, reproductive attributes and yield contributing character is important for improvement and also enhance productivity. A study was conducted on twenty five local chironji genotypes from Dhadgoan tehsil (Satpuda Hill) in Nandurbar district of Maharashtra during the January- May, 2020. There were variability in growth habit ie tree form and foliage. Variation in bark colour and leaf characters ie leaflet shape, leaf margin, leaf base and leaf apex was also observed. The time of flowering time, time of fruit set and time of ripening ranged between 2nd week of February to 4th week of February, 3rd week of February to 4th week of February and 4th week of February to 2nd week of May respectively. The fruit weight, stone weight, kernel weight, kernel recovery, TSS and acidity varied between 1.15 to 1.38 g, 0.61 to 0.71 g, 0.08 to 0.12 g, 12.90 to 18.18 %, 18.15 to 23.15 0Brix and 1.06 to 1.32 % respectively. Based on the horticultural studied the genotypes viz., DCP-5, DCP-15, DCP-17 and DCP-22 were found to be promising among the local chironji genotypes from Dhadgoan tehsil in Nandurbar district of Maharashtra.
Visualization of atomic and molecular systems using phase-space methods
Creators: name: Davies, Benjamin
Publisher: name: Loughborough University
Year: 2021
Subjects: subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences

description: The application of phase-space methods, in particular the Wigner function, to visualziation techniques as a way of gaining deeper insight to quantum systems has found extensive use in areas such as quantum optics. The ability to create visualizations within other fields that better characterize and identify quantum states and correlations is also becoming more prominent. In part, this is due to having to consider quantum correlations across large systems in order to explain physical process such as bond formation and haemoglobin transfer, and to characterize information exchange such as that within quantum information systems. Recently, developments in the generalization of the Wigner function, expressed in a displaced parity form, has provided opportunity for phase-space visualzizations to be extended.Using these techniques, it will be shown how a visualization tool can be created to explore the internal correlations of atomic systems and fully reconstruct a non-trivially correlated state. Applying this tool to quantum chemistry simulation software will highlight how the visualization tool can be applied to the backend of existing systems and provide great utility in subsequent analysis. Further, application to the area of quantum information explores how this visualization technique can help better characterize states and identify signatures that reveal information exchange within quantum systems. This work demonstrates how phase-space visualizations, applied in different ways, can give insight previously unavailable. This insight comes from the treatment of heterogeneous systems, systems with both discrete and continuous variables, allowing for spin-spatial entanglement to be visualized. It will also be seen why a spinor representation is insufficient for displaying spin-spin entanglement.
The model equation of soliton theory
Creators: name: Adler, V. E.
name: Shabat, A. B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We consider an hierarchy of integrable 1+2-dimensional equations related to Lie algebra of the vector fields on the line. The solutions in quadratures are constructed depending on $n$ arbitrary functions of one argument. The most interesting result is the simple equation for the generating function of the hierarchy which defines the dynamics for the negative times and also has applications to the second order spectral problems. A rather general theory of integrable 1+1-dimensional equations can be developed by study of polynomial solutions of this equation under condition of regularity of the corresponding potentials.
description: 17 p
Dipolar Ordering and Quantum Dynamics of Domain Walls in Mn-12 Acetate
Creators: name: Garanin, D. A.
name: Chudnovsky, E. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We find that dipolar interactions favor ferromagnetic ordering of elongated crystals of Mn12 Acetate below 0.8 K. Ordered crystals must possess domain walls. Motion of the wall corresponds to a moving front of Landau-Zener transitions between quantum spin levels. Structure and mobility of the wall are computed. The effect is robust with respect to inhomogeneous broadening and decoherence.
description: 11 PR pages, 4 figures. This is the extended version
X-ray Group and cluster mass profiles in MOND: Unexplained mass on the group scale
Creators: name: Angus, Garry W.
name: Famaey, Benoit
name: Buote, David A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Although very successful in explaining the observed conspiracy between the baryonic distribution and the gravitational field in spiral galaxies without resorting to dark matter (DM), the modified Newtonian dynamics (MOND) paradigm still requires DM in X-ray bright systems. Here, to get a handle on the distribution and importance of this DM, and thus on its possible form, we deconstruct the mass profiles of 26 X-ray emitting systems in MOND, with temperatures ranging from 0.5 to 9 keV. Initially we compute the MOND dynamical mass as a function of radius, then subtract the known gas mass along with a component of galaxies which includes the cD galaxy with $M/L_K=1$. Next we test the compatibility of the required DM with ordinary massive neutrinos at the experimental limit of detection ($m_ν=2$ eV), with density given by the Tremaine-Gunn limit. Even by considering that the neutrino density stays constant and maximal within the central 100 or 150 kpc (which is the absolute upper limit of a possible neutrino contribution there), we show that these neutrinos can never account for the required DM within this region. The natural corollary of this finding is that, whereas clusters (T $\ga$ 3 keV) might have most of their mass accounted for if ordinary neutrinos have a 2 eV mass, groups (T $\lsim$ 2 keV) cannot be explained by a 2 eV neutrino contribution. This means that, for instance, cluster baryonic dark matter (CBDM, Milgrom 2007) or even sterile neutrinos would present a more satisfactory solution to the problem of missing mass in MOND X-ray emitting systems.
description: 13 pages, 8 figures, 1 table, accepted in MNRAS
4D Optically Reconfigurable Volumetric Metamaterials
Creators: name: Dobrykh, Dmitry
name: Mikhailovskaya, Anna
name: Ginzburg, Pavel
name: Filonov, Dmitry
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Metamaterials are artificially created media, which allow introducing additional degrees of freedom into electromagnetic design by controlling constitutive material parameters. Reconfigurable time-dependent metamaterials can further enlarge those capabilities by introducing a temporal variable as an additional controllable parameter. Here we demonstrate a first-of-its-kind reconfigurable volumetric metamaterial-based scatterer, wherein the electromagnetic properties are controlled dynamically with light. In particular, hybridized resonances in arrays of split ring resonators give rise to a collective mode that presents properties of artificial high-frequency magnetism for centimeter waves. Resonant behavior of each individual ring is controlled with a photocurrent, which allows the fast tuning of macroscopic effective permeability. Thus, the artificial gigahertz magnon resonant excitation within a subwavelength spherical scatterer is governed by light intensity. Four-dimensional control over electromagnetic scattering in both space and time opens new venues for modern applications, including wireless communications and automotive radars to name just a few.
Baryon octupole moments
Creators: name: Buchmann, A. J.
name: Henley, E. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We report on a calculation of higher electromagnetic multipole moments of baryons in a non-covariant quark model approach. The employed method is based on the underlying spin-flavor symmetry of the strong interaction and its breaking.We present results on magnetic octupole moments of decuplet baryons and discuss their implications.
description: 3 pages
A discrete time neural network model with spiking neurons. Rigorous results on the spontaneous dynamics
Creators: name: Cessac, B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Dynamical Systems (math.DS)
subject: Chaotic Dynamics (nlin.CD)
subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We derive rigorous results describing the asymptotic dynamics of a discrete time model of spiking neurons introduced in \cite{BMS}. Using symbolic dynamic techniques we show how the dynamics of membrane potential has a one to one correspondence with sequences of spikes patterns (``raster plots''). Moreover, though the dynamics is generically periodic, it has a weak form of initial conditions sensitivity due to the presence of a sharp threshold in the model definition. As a consequence, the model exhibits a dynamical regime indistinguishable from chaos in numerical experiments.
description: 56 pages, 1 Figure, to appear in Journal of Mathematical Biology
MPEC 2025-G53 : 2025 FK22
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2025 FK22

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Rank of 3-tensors with 2 slices and Kronecker canonical forms
Creators: name: Sumi, Toshio
name: Miyazaki, Mitsuhiro
name: Sakata, Toshio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 15A69, 15A72, 14Q99, 14M12, 14M99

description: Tensor type data are becoming important recently in various application fields. We determine a rank of a tensor T so that A+T is diagonalizable for a given 3-tensor A with 2 slices over the complex and real number field.
description: 12 pages, no figure
The development of computer peripheral device for radiation survey with a GPS locator
Creators: name: Wasan Wongsirojkul
name: Decho Thong-Aram
name: Attaporn Pattarasumunt
Publisher: name: Faculty of Engineering, Khon Kaen Univeristy
Year: 2013
Subjects: Survey meter,Computer,USB,GPS, Microcontroller

description: 3, 40, KKU Engineering Journal
$δ_{CP}$ for leptons and a new take on CP physics with the FSM
Creators: name: Bordes, José
name: Chan, Hong-Mo
name: Tsou, Sheung Tsun
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A bonus of the framed standard model (FSM), constructed initially to explain the mass and mixing patterns of quarks and leptons, is asolution (without axions) of the strong CP problem by cancelling the theta-angle term $θ_I$ $Tr (H^{μν} H^*_{μν})$ in colour by a chiral transformation on a quark zero mode which is inherent in FSM, and produces thereby a CP-violating phase in the CKM matrix similar in size to what is observed. Extending here to flavour, one finds that there are two terms proportional to $Tr (G^{μν}G^*_{μν})$: (a) in the action from flavour instantons with unknown coefficient, say $θ'_I$, (b) induced by the above FSM solution to the strong CP-problem with therefore known coefficient $θ'_C$. Both terms can be cancelled in the FSM by a chiral transformation on the lepton zero mode to give a Jarlskog invariant $J'$ in the PMNS matrix for leptons of order $10^{-2}$, as is hinted by experiment. But if the term $θ'_I$ is to be cancelled by a chiral transformation in the predicted hidden sector to solve the strong CP problem therein, leaving only the term $θ'_C$ to be cancelled by the chiral transformation on leptons, then the following prediction results: $J'\sim-0.012$ ($δ'_{CP}\sim(1.11)π$) which is (i) of the right order, (ii) of the right sign, (iii) in the range favoured by present experiment. Together with the earlier result for quarks, this offers an attractive unified treatment of all known CP physics.
description: 26 pages, 1 figure
New bounds on the neutrino magnetic moment from the plasma induced neutrino chirality flip in a supernova
Creators: name: Kuznetsov, Alexander V.
name: Mikheev, Nickolay V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The neutrino chirality-flip process under the conditions of the supernova core is investigated in detail with the plasma polarization effects in the photon propagator taken into account, in a more consistent way than in earlier publications. It is shown in part that the contribution of the proton fraction of plasma is essential. New upper bounds on the neutrino magnetic moment are obtained: mu_nu < (0.5 - 1.1) 10^{-12} mu_B from the limit on the supernova core luminosity for nu_R emission, and mu_nu < (0.4 - 0.6) 10^{-12} mu_B from the limit on the averaged time of the neutrino spin-flip. The best upper bound on the neutrino magnetic moment from SN1987A is improved by the factor of 3 to 7.
description: 19 pages, LaTeX, 7 EPS figures, submitted to Journal of Cosmology and Astroparticle Physics
Structural and phase properties of tetracosane (C24H50) monolayers adsorbed on graphite. Explicit Hydrogen Molecular Dynamics study
Creators: name: Firlej, L.
name: Kuchta, B.
name: Roth, M. W.
name: Connolly, M. J.
name: Wexler, Carlos
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We discuss Molecular Dynamics (MD) computer simulations of tetracosane (C24H50) monolayer physisorbed onto a graphite surface. The alkane molecules are simulated with explicit hydrogens, and the graphite substrate is represented as an all-atom struc-ture having six graphene layers. The tetracosane dynamics modeled in the fully ato-mistic manner agree well with experiment. The low-temperature ordered solid orga-nizes in rectangular centered structure, incommensurate with underlying graphite. Above T = 200 K, as the molecules start to lose their translational and orientational order via gauche defects formation, a weak smectic mesophase (observed experimentally but never reproduced in United Atom (UA) simulations) appears. The phase behavior of the adsorbed layer is critically sensitive to the way the electrostatic interactions is included in the model. If the electrostatic charges are set to zero (as it is in UA force field), the melting temperature increases by ~70 K with respect to the experimental value. When the non-bonded 1-4 interaction is not scaled, the melting temperature decreases by ~90 K. If the scaling factor is set to 0.5, the melting occurs at T = 350 K, in very good agreement with experimental data. PACS number: 82.45.Mp, 64.70.dj
description: 13 pages, 11 embedded figures, PDF format
Loss-tolerant all-photonic quantum repeater with generalized Shor code
Creators: name: Zhang, Rui
name: Liu, Li-Zheng
name: Li, Zheng-Da
name: Fei, Yue-Yang
name: Yin, Xu-Fei
name: Li, Li
name: Liu, Nai-Le
name: Mao, Yingqiu
name: Chen, Yu-Ao
name: Pan, Jian-Wei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The all-photonic quantum repeater (APQR) is a promising repeater scheme to realize long-distance quantum communication. For a practical APQR, an indispensable requirement is the robustness of the repeater graph state (RGS) against photon loss. We propose a new loss-tolerant scheme by applying the generalized Shor code to RGS, which can be experimentally demonstrated with current technology. Experimentally, we first prepare and verify the nine-qubit Shor code. Then, by applying the generalized Shor code to APQR and preparing a simplified encoded RGS with the structure of $1\times2$ based on the Shor code state, the effectiveness of our loss-tolerant scheme and the loss tolerance of the encoded RGS are respectively verified. Our results make an essential step toward a practical APQR and enrich the research of quantum error correction code.
description: 8 pages, 5 figures
Letter from Kathleen Raine to Robin Skelton, [April 20, 1955]
Creators: name: Raine, Kathleen, 1908-2003
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Raine, Kathleen, 1908-2003
valueUri: http://id.worldcat.org/fast/52672
subject: Literature, Modern
valueUri: http://id.worldcat.org/fast/1000172
subject: Editors
valueUri: http://id.worldcat.org/fast/902475
subject: Poets
valueUri: http://id.worldcat.org/fast/1067778
subject: Scholars
valueUri: http://id.worldcat.org/fast/1106878
subject: Novelists
valueUri: http://id.worldcat.org/fast/1039684
subject: English poetry--Manuscripts
valueUri: http://id.worldcat.org/fast/912320
subject: Authors, English
valueUri: http://id.worldcat.org/fast/821945
subject: Skelton, Robin
valueUri: http://id.worldcat.org/fast/51853
subject: Neoplatonism
valueUri: http://id.worldcat.org/fast/1035884
subject: Novelists, English
valueUri: http://id.worldcat.org/fast/1039718
subject: Book industries and trade
valueUri: http://id.worldcat.org/fast/836171
subject: Periodical editors
valueUri: http://id.worldcat.org/fast/1058064
subject: Philosophy
valueUri: http://id.worldcat.org/fast/1060777
subject: FOS: Philosophy, ethics and religion
subject: Wiccans
valueUri: http://id.worldcat.org/fast/1765210
subject: Periodicals--Publishing
valueUri: http://id.worldcat.org/fast/1058100
subject: Platonists
valueUri: http://id.worldcat.org/fast/1066881
subject: Critics
valueUri: http://id.worldcat.org/fast/883769
subject: Poets, English
valueUri: http://id.worldcat.org/fast/1067870

description: Part of a collection of correspondence from Kathleen Raine to Robin Skelton. Skelton was a British poet, academic, anthologist, and practicing Wiccan. He taught at Manchester University before emigrating to Canada in 1963, where he taught creative writing at the University of Victoria and started the literary magazine The Malahat Review. Also included are some letters to Skelton’s wife Sylvia, and his daughters. Spanning close to forty-five years, the correspondence discusses poetry, writing, and philosophy; particularly Platonism and Neoplatonism. Raine often refers to the writings of William Blake and W. B. Yeats. Many letters also mention contemporary literary figures at the time including: Herbert Read, Peter Russell, Liam Miller, and Thurairajah Tambimuttu. In this letter Raine thanks Skelton for his visit and discusses the London library.
Experimental observation of intrinsic light localization in photonic icosahedral quasicrystals
Creators: name: Sinelnik, Artem D.
name: Shishkin, Ivan I.
name: Yu, Xiaochang
name: Samusev, Kirill B.
name: Belov, Pavel A.
name: Limonov, Mikhail F.
name: Ginzburg, Pavel
name: Rybin, Mikhail V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: One of the most intriguing problems of light transport in solids is the localization that has been observed in various disordered photonic structures1-11. The light localization in defect-free icosahedral quasicrystals has recently been predicted theoretically without experimental verification10. Here we report on the fabrication of submicron-size dielectric icosahedral quasicrystals and demonstrate the results of detailed studies of the photonic properties of these structures. Here, we present the first direct experimental observation of intrinsic light localization in defect-free quasicrystals. This result was obtained in time-resolved measurements at different laser wavelengths in the visible. We linked localization with the aperiodicity of the icosahedral structure, which led to uncompensated scattering of light from an individual structural element over the entire sphere, providing multiple scattering inside the sample and, as a result, the intrinsic localization of light.
$^{50}$Ti($d$,$p$)$^{51}$Ti, single neutron energies in the $N=29$ isotones and the $N=32$ subshell closure
Creators: name: Riley, L. A.
name: Nebel-Crosson, 1 J. M.
name: Macon, 1 K. T.
name: McCann, 2 G. W.
name: Baby, L. T.
name: Caussyn, D.
name: Cottle, P. D.
name: Esparza, J.
name: Hanselman, K.
name: Kemper, K. W.
name: Temanson, E.
name: Wiedenhöver, I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A measurement of the $^{50}$Ti($d$,$p$)$^{51}$Ti reaction at 16 MeV was performed using a Super Enge Split Pole Spectrograph to measure the magnitude of the $N=32$ subshell gap in Ti. Seven states were observed that had not been observed in previous ($d$,$p$) measurements, and the \textit{L} transfer values for six previously measured states were either changed or measured for the first time. The results were used to determine single neutron energies for the $p_{3/2}$, $p_{1/2}$ and $f_{5/2}$ orbitals. The resulting single neutron energies in $^{51}$Ti confirm the existence of the $N=32$ gap in Ti. These single neutron energies and those from previous measurements in $^{49}$Ca, $^{53}$Cr and $^{55}$Fe are compared to values from a covariant density functional theory calculation.
description: 17 pages, 6 figures
Developing a Nuclear Material Control and Accounting System in Russia
Creators: name: Kovchegin, Dmitry
Publisher: name: Digital Repository at the University of Maryland
Year: 2013
Subjects: nuclear
russia
material

description: When considering the requirements for a global nuclear material accounting system, Russia’s experience in developing its domestic system deserves special attention for four reasons: First, Russia’s nuclear complex includes all of the types of nuclear facilities and nuclear material handling procedures that would be subject to a global system. Second, Russia has significant experience transitioning from an outdated system to a modern one. Third, Russia has operated its nuclear complex in a financially constrained environment and has relied in part on international assistance. Finally, the Russian nuclear complex is managed by many agencies with their own agendas, priorities, and visions of nuclear material accounting. This experience with an interagency environment may be a model for other countries.

As a major nuclear power—in both military and civilian applications—Russia possesses all possible types of nuclear facilities, including all types of nuclear reactors, a complete range of fuel cycle facilities, storage sites, and several types of nuclear ships.  Russia also possesses a wide variety of nuclear materials, including all types of uranium and various isotopic compositions of plutonium. These materials exist in both items and bulk accounting forms, as well is in a number of physical forms including metals, oxides, solutions, and salts. These materials are subject to a broad range of operations–at both the industrial scale and in smaller quantities for research purposes. Russia is also heavily involved in the domestic and international trade of nuclear materials. This results in a significant volume of nuclear materials transport—to include changes in ownership and in control and accounting requirements and systems.

Russia began transitioning from its Soviet-era nuclear material accounting systems in the early 1990s. The Soviet Union was home to a comprehensive nuclear industry and nuclear materials accounting system. Thus, a modern system based on new standards had to be introduced into an operating nuclear complex. This process has confronted many challenges, in part because of the major cultural change that it required. After nearly 20 years of evolving the Russian system, some important issues remain unresolved.
A Fresh Look at the Architecture and Performance of Contemporary Isolation Platforms
Creators: name: van Rijn, Vincent
name: Rellermeyer, Jan S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: With the ever-increasing pervasiveness of the cloud computing paradigm, strong isolation guarantees and low performance overhead from isolation platforms are paramount. An ideal isolation platform offers both: an impermeable isolation boundary while imposing a negligible performance overhead. In this paper, we examine various isolation platforms (containers, secure containers, hypervisors, unikernels), and conduct a wide array of experiments to measure the performance overhead and degree of isolation offered by the platforms. We find that container platforms have the best, near-native, performance while the newly emerging secure containers suffer from various overheads. The highest degree of isolation is achieved by unikernels, closely followed by traditional containers.
Feedforward and feedback influences through distinct frequency bands between two spiking-neuron networks
Creators: name: Porta, Leonardo Dalla
name: Castro, Daniel M.
name: Copelli, Mauro
name: Carelli, Pedro V.
name: Matias, Fernanda S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: Several studies with brain signals suggested that bottom-up and top-down influences are exerted through distinct frequency bands among visual cortical areas. It has been recently shown that theta and gamma rhythms subserve feedforward, whereas the feedback influence is dominated by the alpha-beta rhythm in primates. A few theoretical models for reproducing these effects have been proposed so far. Here we show that a simple but biophysically plausible two-network motif composed of spiking-neuron models and chemical synapses can exhibit feedforward and feedback influences through distinct frequency bands. Differently from previous studies, this kind of model allows us to study directed influences not only at the population level, by using a proxy for the local field potential, but also at the cellular level, by using the neuronal spiking series.
A new method for the estimation of variance matrix with prescribed zeros in nonlinear mixed effects models
Creators: name: Chafai, Djalil
name: Concordet, Didier
Publisher: name: arXiv
Year: 2007
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: 62F10; 65C60

description: We propose a new method for the Maximum Likelihood Estimator (MLE) of nonlinear mixed effects models when the variance matrix of Gaussian random effects has a prescribed pattern of zeros (PPZ). The method consists in coupling the recently developed Iterative Conditional Fitting (ICF) algorithm with the Expectation Maximization (EM) algorithm. It provides positive definite estimates for any sample size, and does not rely on any structural assumption on the PPZ. It can be easily adapted to many versions of EM.
description: Accepted for publication in Statistics and Computing
Real Time Cluster Path Tracing
Creators: name: Xie, Feng
name: Mishchuk, Petro
name: Hunt, Warren
Publisher: name: arXiv
Year: 2021
Subjects: subject: Graphics (cs.GR)
subject: FOS: Computer and information sciences
subject: I.3.2; I.3.3

description: Photorealistic rendering effects are common in films, but most real time graphics today still rely on scan-line based multi-pass rendering to deliver rich visual experiences. While there have been prior works in distributed path tracing for static scene and objects under rigid motion, real time path tracing of deforming characters has to support per-frame dynamic BVH changes. We present the architecture and implementation of the first real-time production quality cluster path tracing renderer that supports film quality animation and deformation. We build our cluster path tracing system using the open source Blender and its GPU accelerated production quality renderer Cycles. Our system's rendering performance and quality scales linearly with the number of RTX cluster nodes used. It is able to generate and deliver path traced images with global illumination effects to remote light-weight client systems at 15-30 frames per second for a variety of Blender scenes including animated digital human characters with skin deformation and virtual objects.
description: 5 pages, 7 figures. To be published in Siggraph Asia 2021's Telecommunication Program
THE FAIR USE DOCTRINE AS A LIMITATION TO COPYRIGHT AND A COMPARATIVE ANALYSIS OF THE THREE-STEP TEST IN THE COPYRIGHT SYSTEMS OF BRAZIL AND THE U.S.
Creators: name: Leite, Eduardo Lycurgo
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 48
subject: Law and legal studies
classificationCode: 480399
subject: International and comparative law not elsewhere classified

description: Shortly after the Brazilian 1998 Copyright Law was enacted, calls for its reform arose due to the inadequacy of its provisions to adapt to technology changes and provide an adequate balance between grants of rights and reservations to those right in copyright law. The lack of limitations on private use unreasonably compromised the necessary balance for development and growth. Discussions about the adequacy of the closed-list model for limitations and exceptions also arose, providing an opportunity to consider the implementation of a system of copyright imitations and exceptions based on an open-ended list or the fair use doctrine. This dissertation analyzes copyright and the U.S. fair use doctrine from the standpoint of copyright's objectives and the theories on which the doctrine is based on, especially the reasonableness theory, and its compliance with the Three-Step Test included in the three major international agreements related to intellectual property and copyright law: the Berne Convention, the TRIPs Agreement, and the WIPO Copyright Treaty. This study concludes that the fair use doctrine likely complies with the Three-Step Test and copyright's objectives and analyzes the current situation of copyrights in Brazil, specifically its unbalanced limitations/exception system, and proposes that there are grounds for implementing the fair use doctrine.
Curvaton Dynamics and the Non-Linearity Parameters in Curvaton Model
Creators: name: Huang, Qing-Guo
name: Wang, Yi
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the curvaton dynamics and the non-linearity parameters in curvaton model with potential slightly deviating from the quadratic form in detail. The non-linearity parameter $g_{NL}$ will show up due to the curvaton self-interaction. We also point out that the leading order of non-quadratic term in the curvaton potential can be negative, for example in the axion-type curvaton model. If a large positive $g_{NL}$ is detected, the axion-type curvaton model will be preferred.
description: 14 pages, 4 figures; refs added
THE FAIR USE DOCTRINE AS A LIMITATION TO COPYRIGHT AND A COMPARATIVE ANALYSIS OF THE THREE-STEP TEST IN THE COPYRIGHT SYSTEMS OF BRAZIL AND THE U.S.
Creators: name: Leite, Eduardo Lycurgo
Publisher: name: American University
Year: 2023

description: Shortly after the Brazilian 1998 Copyright Law was enacted, calls for its reform arose due to the inadequacy of its provisions to adapt to technology changes and provide an adequate balance between grants of rights and reservations to those right in copyright law. The lack of limitations on private use unreasonably compromised the necessary balance for development and growth. Discussions about the adequacy of the closed-list model for limitations and exceptions also arose, providing an opportunity to consider the implementation of a system of copyright imitations and exceptions based on an open-ended list or the fair use doctrine. This dissertation analyzes copyright and the U.S. fair use doctrine from the standpoint of copyright's objectives and the theories on which the doctrine is based on, especially the reasonableness theory, and its compliance with the Three-Step Test included in the three major international agreements related to intellectual property and copyright law: the Berne Convention, the TRIPs Agreement, and the WIPO Copyright Treaty. This study concludes that the fair use doctrine likely complies with the Three-Step Test and copyright's objectives and analyzes the current situation of copyrights in Brazil, specifically its unbalanced limitations/exception system, and proposes that there are grounds for implementing the fair use doctrine.
On the magnetic structure of the solar transition region
Creators: name: Judge, Philip G.
name: Centeno, Rebecca
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine the hypothesis that ``cool loops'' dominate emission from solar transition region plasma below temperatures of $2\times10^5$K. We compare published VAULT images of H L$α$, a lower transition region line, with near-contemporaneous magnetograms from Kitt Peak, obtained during the second flight (VAULT-2) on 14 June 2002. The measured surface fields and potential extrapolations suggest that there are too few short loops, and that L$α$ emission is associated with the base regions of longer, coronal loops. VAULT-2 data of network boundaries have an asymmetry on scales larger than supergranules, also indicating an association with long loops. We complement the Kitt Peak data with very sensitive vector polarimetric data from the Spectro-Polarimeter on board Hinode, to determine the influence of very small magnetic concentrations on our analysis. From these data two classes of behavior are found: within the cores of strong magnetic flux concentrations ($> 5\times10^{18}$ Mx) associated with active network and plage, small-scale mixed fields are absent and any short loops can connect just the peripheries of the flux to cell interiors. Core fields return to the surface via longer, most likely coronal, loops. In weaker concentrations, short loops can connect between concentrations and produce mixed fields within network boundaries as suggested by Dowdy and colleagues. The VAULT-2 data which we examined are associated with strong concentrations. We conclude that the cool loop model applies only to a small fraction of the VAULT-2 emission, but we cannot discount a significant role for cool loops in quieter regions. We suggest a physical picture for how network L$α$ emission may occur through the cross-field diffusion of neutral atoms from chromospheric into coronal plasma.
description: Accepted by ApJ, 9 May 2008