cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A detailed evaluation of surface, thermal, and flammable properties of polyamide 12/glass beads composites fabricated by multi jet fusion
Creators: name: Guo, Binbin
name: Xu, Zhiyao
name: Luo, Xue
name: Bai, Jiaming
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Space Science
subject: Physiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Hematology

description: Multi jet fusion (MJF) is an emerging powder three-dimensional (3D) printing technology with an ultrafast printing speed, in which polyamide 12 (PA12) is the main material currently utilised. Although structurally sophisticated 3D components have been printed by MJF, there are limitations due to the high cost of printing materials and inferior performance of the printed parts. Here, PA12/glass beads (PA12/GBs) composites with improved performance were manufactured via the MJF technique. Incorporating GBs effectively regulated the dimensional accuracy. Furthermore, the composite possessed lower surface roughness and higher surface hardness than neat PA12. Thermal analysis showed that the composite exhibited an enhanced decomposition temperature (390 °C) and char yield (38.4 wt.%) compared to neat PA12. Remarkably, the incorporation of GBs did not improve the flame retardance of neat PA12. We identified the improved functionalities of PA12/GBs composites in terms of dimensional accuracy, surface, and thermal properties and analysed possible mechanisms for the observed increased flammability.
Direct measurement of the acoustic waves generated by femtosecond filaments in air
Creators: name: Wahlstrand, J. K.
name: Jhajj, N.
name: Rosenthal, E. W.
name: Zahedpour, S.
name: Milchberg, H. M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present direct measurements of the gas acoustic dynamics following interaction of spatial single- and multi-mode 50 fs, 800 nm pulses in air at 10 Hz and 1 kHz repetition rates. Results are in excellent agreement with hydrodynamic simulations. Under no conditions for single filaments do we find on-axis enhancement of gas density; this occurs only with multi-filaments. We also investigate the propagation of probe beams in the gas density profile induced by a single extended filament. We find that light trapping in the expanding annular acoustic wave can create the impression of on-axis guiding in a limited temporal window.
Formation of dwarf ellipticals and dwarf irregular galaxies by interaction of giant galaxies under environmental influence
Creators: name: Chattopadhyay, Tanuka
name: Debsarma, Suma
name: Karmakar, Pradip
name: Davoust, Emmanuel
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: 85

description: A model is proposed for the formation of gas-rich dwarf irregular galaxies and gas-poor, rotating dwarf elliptical galaxies following the interaction between two giant galaxies as a function of space density. The formation of dwarf galaxies is considered to depend on a random variable, the tidal index theta, an environmental parameter defined by Karachentsev et al. (2004), such that for theta less than zero, the formation of dwarf irregular galaxy is assured whereas for theta greater than zero, the formation of dwarf ellipticals is preferred. It is found that for particular ranges of the interactive parameters the model predictions are in good agreement with the observed number density of the different galaxy types as a function of space density in four clusters of galaxies. This supports the fact that galaxy interactions do not all necessarily give rise to the formation of either dwarf irregulars or dwarf ellipticals. It is also shown that the formation of dwarf irregulars at high densities is much lower than that of dwarf ellipticals, and that the formation of the latter reaches a maximum at a particular space density, unlike the former. This suggests that at high densities many dwarf irregulars are stripped of their gaseous envelopes to become dwarf elliptical.
description: 26 pages, 5 tables, 3 figures
Mordrel, C.- Benjamin, R., Noviazgo y matrimonio. Orientaciones para la formación de los esposos. Ed. Marova. Vol. de 212 ps. 145x195. Madrid 1968
Creators: name: Marques, José Silva
Publisher: name: Theologica
Year: 1971

description: Theologica, v. 6 n. 3 (1971)
Reconciling BICEP2 and Planck results with right-handed Dirac neutrinos in the fundamental representation of grand unified E_6
Creators: name: Anchordoqui, Luis A.
name: Goldberg, Haim
name: Huang, Xing
name: Vlcek, Brian J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The tensor-to-scalar ratio (r = 0.20^{+0.07}_{-0.05}) inferred from the excess B-mode power observed by the Background Imaging of Cosmic Extragalactic Polarization (BICEP2) experiment is almost twice as large as the 95% CL upper limits derived from temperature measurements of the WMAP (r<0.13) and Planck (r<0.11) space missions. Very recently, it was suggested that additional relativistic degrees of freedom beyond the three active neutrinos and photons can help to relieve this tension: the data favor an effective number of light neutrino species N_{eff} = 3.86 \pm 0.25. Since the BICEP2 ratio implies the energy scale of inflation (V_*^{1/4} \sim 2 \times 10^{16} GeV) is comparable to the grand unification scale, in this paper we investigate whether we can accommodate the required N_{eff} with three right-handed (partners of the left-handed standard model) neutrinos living in the fundamental representation of a grand unified exceptional E_6 group. We show that the superweak interactions of these Dirac states (through their coupling to a TeV-scale Z' gauge boson) lead to decoupling of right-handed neutrino just above the QCD cross over transition: 175 MeV < T_{ν_R}^{dec} < 250 MeV. For decoupling in this transition region, the contribution of the three right-handed neutrinos to N_{eff} is suppressed by heating of the left-handed neutrinos (and photons). Consistency (within 1σ) with the favored N_{eff} is achieved for 4.5 TeV < M_{Z'} < 7.5 TeV. The model is fully predictive and can be confronted with future data from LHC14.
description: 14 pages revtex, 4 figures
The Efficiency Examination of Teaching of Different Normalization Methods
Creators: name: Czenky, Márta
Publisher: name: arXiv
Year: 2014
Subjects: subject: Databases (cs.DB)
subject: FOS: Computer and information sciences
subject: H.2.1; K.3.2

description: Normalization is an important database design method, in the course of the teaching of data modeling the understanding and applying of this method cause problems for students the most. For improving the efficiency of learning normalization we looked for alternative normalization methods and introduced them into education. We made a survey among engineer students how efficient could they execute the normalization with different methods. We executed statistical and data mining examinations to decide whether any of the methods resulted significantly better solutions.
Report on the Geology of the San Pedro Hills
Creators: name: Bell, Frank Wagner
Publisher: name: California Institute of Technology
Year: 1928
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: The San Pedro Hills Area is composed of Basement Complex overlain by a series of late Tertiary and Quaternary marine sediments. There is a series of intrusive rocks forming sills and laccolithic masses in the vicinity of San Pedro Hill.

There is a great abundance of fossil material in the very late Tertiary and Quaternary beds, offering ample opportunity for the paleontologist to accurately zone the different formations.

The folding is quite acute, but there has been no important faulting in the area.
Modeling the Field Control of the Surface Electroclinic Effect near Continuous and First Order Smectic-A*-Smectic-C* Transitions
Creators: name: Zappitelli, Kara
name: Hipolite, Dana N.
name: Saunders, Karl
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We present and analyze a model for the combination of bulk and surface electroclinic effects in the smectic-A* (Sm-A) phase near a Sm-A*--Sm-C* transition. As part of our analysis we calculate the dependence of the surface tilt on external electric field and show that it can be eliminated, or even reversed from its zero-field value. This is in good agreement with previous experimental work on a system (W415) with a continuous Sm-A*--Sm-C* transition. We also analyze, for the first time, the combination of bulk and surface electroclinic effects in systems with a first order Sm-A*--Sm-C* transition. The variation of surface tilt with electric field in this case is much more dramatic, with discontinuities and hysteresis. Near each type of Sm-A*--Sm-C* transition we obtain the temperature dependence of the field required to eliminate surface tilt. Additionally, we analyze the effect of varying the system's enantiomeric excess, showing that it strongly affects the field dependence of surface tilt, in particular, near a first order Sm-A*--Sm-C* transition. In this case, increasing enantiomeric excess can change the field dependence of surface tilt from continuous to discontinuous. Our model also allows us to calculate the variation of layer spacing in going from surface to bulk, which in turn allows us to estimate the strain resulting from the difference between the surface and bulk layer spacing. We show that for certain ranges of applied electric field, this strain can result in layer buckling which reduces the overall quality of the liquid crystal cell. For de Vries materials, with small tilt-induced change in layer spacing, the induced strain for a given surface tilt should be smaller. However, we argue that this may be offset by the fact that de Vries materials, which typically have Sm-A*--Sm-C* transitions near a tricritical point, will generally have larger surface tilt.
Exotic magnetism on the quasi-FCC lattices of the $d^3$ double perovskites La$_2$NaB$'$O$_6$ (B$'$ $=$ Ru, Os)
Creators: name: Aczel, A. A.
name: Baker, P. J.
name: Bugaris, D. E.
name: Yeon, J.
name: Loye, H. -C. zur
name: Guidi, T.
name: Adroja, D. T.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We find evidence for long-range and short-range ($ζ$ $=$ 70 Å~at 4 K) incommensurate magnetic order on the quasi-face-centered-cubic (FCC) lattices of the monoclinic double perovskites La$_2$NaRuO$_6$ and La$_2$NaOsO$_6$ respectively. Incommensurate magnetic order on the FCC lattice has not been predicted by mean field theory, but may arise via a delicate balance of inequivalent nearest neighbour and next nearest neighbour exchange interactions. In the Ru system with long-range order, inelastic neutron scattering also reveals a spin gap $Δ$ $\sim$ 2.75 meV. Magnetic anisotropy is generally minimized in the more familiar octahedrally-coordinated $3d^3$ systems, so the large gap observed for La$_2$NaRuO$_6$ may result from the significantly enhanced value of spin-orbit coupling in this $4d^3$ material.
description: 5 pages, 4 figures
title: Absurdist Sci-Fi Humor: Comparable Attitudes Regarding Absurdism in Hitchhiker’s Guide to the Galaxy and Rick and Morty
Creators: name: Candelaria, Rene L.
Publisher: name: Old Dominion University Libraries
Year: 2018

description: Absurdism is a default thought of cosmic meaninglessness that society is continuously trying to solve to avoid depression and live with some ascribed meaning. Two parody science fiction series, Hitchikers’s Guide to the Galaxy and Rick and Morty, display similar outlooks on the answer to this social phenomenon. Both series explore the possible answers offered by religion, science, and philosophy as well as the inevitable failings of the three. Ultimately, both series agree that our pursuit of distractions, which hold personal and societal meaning, is the only answer because it is impossible to find meaning on a grander scale. The search is as meaningless as meaning itself, and the only solution is not to worry about it.
Gradient-Based Dovetail Joint Shape Optimization for Stiffness
Creators: name: Sun, Xingyuan
name: Cai, Chenyue
name: Adams, Ryan P.
name: Rusinkiewicz, Szymon
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: It is common to manufacture an object by decomposing it into parts that can be assembled. This decomposition is often required by size limits of the machine, the complex structure of the shape, etc. To make it possible to easily assemble the final object, it is often desirable to design geometry that enables robust connections between the subcomponents. In this project, we study the task of dovetail-joint shape optimization for stiffness using gradient-based optimization. This optimization requires a differentiable simulator that is capable of modeling the contact between the two parts of a joint, making it possible to reason about the gradient of the stiffness with respect to shape parameters. Our simulation approach uses a penalty method that alternates between optimizing each side of the joint, using the adjoint method to compute gradients. We test our method by optimizing the joint shapes in three different joint shape spaces, and evaluate optimized joint shapes in both simulation and real-world tests. The experiments show that optimized joint shapes achieve higher stiffness, both synthetically and in real-world tests.
description: ACM SCF 2023: Proceedings of the 8th Annual ACM Symposium on Computational Fabrication
Energy of Ni/Ni$_{3}$Al Interface: a Temperature-Dependent Theoretical Study
Creators: name: Martins, A. S.
name: de Campos, M. F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Using plane wave {\textit{ab-initio}} and Monte Carlo techniques, the Ni/Ni$_{3}$Al interfacial energy is studied and the results from the different techniques are critically compared. Two issues deserved special attention: the dependency of the interface energy with the supercell size, for the {\textit{ab-initio}} calculations, and the temperature dependence of the interface energy. The calculations show that from 0K up to 1000 K that energy decreases by 1 mJ/m$^2$.
description: 4 pages, 3 figures
Equistarable graphs and counterexamples to three conjectures on equistable graphs
Creators: name: Milanič, Martin
name: Trotignon, Nicolas
Publisher: name: arXiv
Year: 2014
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 05C22, 05C50, 05C69, 05C76

description: Equistable graphs are graphs admitting positive weights on vertices such that a subset of vertices is a maximal stable set if and only if it is of total weight $1$. In $1994$, Mahadev et al.~introduced a subclass of equistable graphs, called strongly equistable graphs, as graphs such that for every $c \le 1$ and every non-empty subset $T$ of vertices that is not a maximal stable set, there exist positive vertex weights such that every maximal stable set is of total weight $1$ and the total weight of $T$ does not equal $c$. Mahadev et al. conjectured that every equistable graph is strongly equistable. General partition graphs are the intersection graphs of set systems over a finite ground set $U$ such that every maximal stable set of the graph corresponds to a partition of $U$. In $2009$, Orlin proved that every general partition graph is equistable, and conjectured that the converse holds as well. Orlin's conjecture, if true, would imply the conjecture due to Mahadev, Peled, and Sun. An intermediate conjecture, one that would follow from Orlin's conjecture and would imply the conjecture by Mahadev, Peled, and Sun, was posed by Miklavič and Milanič in $2011$, and states that every equistable graph has a clique intersecting all maximal stable sets. The above conjectures have been verified for several graph classes. We introduce the notion of equistarable graphs and based on it construct counterexamples to all three conjectures within the class of complements of line graphs of triangle-free graphs.
Computing in Operations Research using Julia
Creators: name: Lubin, Miles
name: Dunning, Iain
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: Numerical Analysis (math.NA)
subject: Programming Languages (cs.PL)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: The state of numerical computing is currently characterized by a divide between highly efficient yet typically cumbersome low-level languages such as C, C++, and Fortran and highly expressive yet typically slow high-level languages such as Python and MATLAB. This paper explores how Julia, a modern programming language for numerical computing which claims to bridge this divide by incorporating recent advances in language and compiler design (such as just-in-time compilation), can be used for implementing software and algorithms fundamental to the field of operations research, with a focus on mathematical optimization. In particular, we demonstrate algebraic modeling for linear and nonlinear optimization and a partial implementation of a practical simplex code. Extensive cross-language benchmarks suggest that Julia is capable of obtaining state-of-the-art performance.
description: Source code included in supplement
Room temperature local ferromagnetism and nanoscale domain growth in the ferromagnetic semiconductor GeFe
Creators: name: Wakabayashi, Yuki K.
name: Sakamoto, Shoya
name: Takeda, Yukiharu
name: Ishigami, Keisuke
name: Takahashi, Yukio
name: Saitoh, Yuji
name: Yamagami, Hiroshi
name: Fujimori, Atsushi
name: Tanaka, Masaaki
name: Ohya, Shinobu
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigate the local electronic structure and magnetic properties of the group IV based ferromagnetic semiconductor, GeFe, using soft X ray magnetic circular dichroism. Our results show that the doped Fe 3d electrons are strongly hybridized with the Ge 4p states, and have an unusually large orbital magnetic moment relative to the spin magnetic moment; i.e., morb/mspin = 0.3. We find that local ferromagnetic domains, which are formed through ferromagnetic exchange interactions in the high Fe content regions of the GeFe films, exist at room temperature, well above the Curie temperature. We demonstrate the first observation of the intriguing nanoscale domain growth process in which ferromagnetic domains expand as the temperature decreases, followed by a transition of the entire film into a ferromagnetic state at the Curie temperature.
Transport enhancement and suppression in turbulent magnetic reconnection: A self-consistent turbulence model
Creators: name: Yokoi, Nobumitsu
name: Higashimori, Katsuaki
name: Hoshino, Masahiro
Publisher: name: arXiv
Year: 2014
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Through the enhancement of transport, turbulence is expected to contribute to the fast reconnection. However the effects of turbulence are not so straightforward. In addition to the enhancement of transport, turbulence under some environment shows effects that suppress the transport. In the presence of turbulent cross helicity, such a dynamic balance between the transport enhancement and suppression occurs. As this result of dynamic balance, the region of effective enhanced magnetic diffusivity is confined to a narrow region, leading to the fast reconnection. In order to confirm this idea, a self-consistent turbulence model for the magnetic reconnection is proposed. With the aid of numerical simulations where turbulence effects are incorporated in a consistent manner through the turbulence model, the dynamic balance in the turbulence magnetic reconnection is confirmed.
description: 18 pages, 7 figures
Crystal growth and properties of the non-centrosymmetric superconductor, Ru7B3
Creators: name: Singh, Ravi P.
name: Parzyk, Natalia A.
name: Lees, Martin R.
name: Paul, Don McK
name: Balakrishnan, Geetha
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We describe the crystal growth of high quality single crystals of the non-centrosymmetric superconductor, Ru7B3 by the floating zone technique, using an optical furnace equipped with xenon arc lamps. The crystals obtained are large and suitable for detailed measurements, and have been examined using x-ray Laue patterns. The superconducting properties of the crystals obtained have been investigated by magnetisation and resistivity measurements. Crystals have also been grown starting with enriched 11B isotope, making them suitable for neutron scattering experiments.
description: 4 pages, 5 figures. Accepted for publication in Journal of Crystal Growth
Representation Theorems for Solvable Sesquilinear Forms
Creators: name: Corso, Rosario
name: Trapani, Camillo
Publisher: name: arXiv
Year: 2017
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47A07, 47A30

description: New results are added to the paper [4] about q-closed and solvable sesquilinear forms. The structure of the Banach space $\mathcal{D}[||\cdot||_Ω]$ defined on the domain $\mathcal{D}$ of a q-closed sesquilinear form $Ω$ is unique up to isomorphism, and the adjoint of a sesquilinear form has the same property of q-closure or of solvability. The operator associated to a solvable sesquilinear form is the greatest which represents the form and it is self-adjoint if, and only if, the form is symmetric. We give more criteria of solvability for q-closed sesquilinear forms. Some of these criteria are related to the numerical range, and we analyse in particular the forms which are solvable with respect to inner products. The theory of solvable sesquilinear forms generalises those of many known sesquilinear forms in literature.
description: 27 pages
The Geology of the Southern Part of the Indio Quadrangle, California
Creators: name: Eckis, Rollin Pollard
Publisher: name: California Institute of Technology
Year: 1930
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Spurs of the Peninsular Range of Southern California
extend southeasterly into the Salton Sink at several places along its western margin, and thus produce a mountain front characterized by deep re-entrant valleys. The origin of these
peculiar features has been much discussed, and with this
problem in view the present investigation was undertaken.

A strip about 15 miles wide across the southern portion
of the Indio Quadrangle, extending from the Salton Sea
westerly to the upland area of the main Peninsular Range
has been studied in some detail. Special attention has been
given to the structure.

This area includes two spurs, the Santa Rosa and
Coyote spurs, and two re-entrant valleys, Clark and Borego
Valleys.
Tunable coupler for superconducting Xmon qubits: Perturbative nonlinear model
Creators: name: Geller, Michael R.
name: Donate, Emmanuel
name: Chen, Yu
name: Neill, Charles
name: Roushan, Pedram
name: Martinis, John M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study a recently demonstrated design for a high-performance tunable coupler suitable for superconducting Xmon and planar transmon qubits [Y. Chen et al., arXiv:1402.7367]. The coupler circuit uses a single flux-biased Josephson junction and acts as a tunable current divider. We calculate the effective qubit-qubit interaction Hamiltonian by treating the nonlinearity of the qubit and coupler junctions perturbatively. We find that the qubit nonlinearity has two principal effects: The first is to suppress the magnitude of the transverse XX coupling from that obtained in the harmonic approximation by about 15%. The second is to induce a small diagonal ZZ coupling. The effects of the coupler junction nonlinearity are negligible in the parameter regime considered.
Huvelin, H., Le renouveau de la vie spirituelle au XVII siècle. Cours de l'hlstoire de l’Église. Tomo 10. Editorial Saint-Paul. Vol. de 290 ps. 145x200. Paris 1969
Creators: name: Santos, Alexandrino Fernandes Dos
Publisher: name: Theologica
Year: 1971

description: Theologica, v. 6 n. 3 (1971)
Strax and Straxen: Streaming analysis for xenon experiments
Creators: name: Angevaare, Joran Remco
name: Wenz, Daniel
Publisher: name: Zenodo
Year: 2020

description: (on behalf of the XENON collaboration)
 Strax and Straxen: Streaming analysis for xenon experiments. Over the last decades noble liquid time projection chambers (TPCs) have become one of the forefront technologies for the search in WIMP dark matter. As the detector increases in size, so do the amount of data and data-rates, leading to higher demands on the analysis software. The "streaming analysis for xenon experiments" (strax) is a software package used by the XENON collaboration. It provides a framework for signal processing, data storage and reduction as well as corrections handling for noble liquid TPCs. The software is written in Python and relies heavily on the SciPy-stack. The data itself is organized in a tabular format utilizing a combination of numpy structured arrays and numba for high performances. This approach allows live online processing of the data with throughputs of 60 MB raw / sec / core. Strax is an open source project and is used by a couple of smaller liquid xenon TPCs such as XAMS and XEBRA. It is also test by the nEXO Experiment for their MC simulations. In this talk we will explain the working principle and infrastructure provided by strax. We will show how a complex processing streamline can be build up via so called strax plugins based on XENON-collaborations open source package called straxen.
Triangle-free graphs that do not contain an induced subdivision of $K_4$ are 3-colorable
Creators: name: Chudnovsky, Maria
name: Liu, Chun-Hung
name: Schaudt, Oliver
name: Spirkl, Sophie
name: Trotignon, Nicolas
name: Vuskovic, Kristina
Publisher: name: arXiv
Year: 2017
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: We show that triangle-free graphs that do not contain an induced subgraph isomorphic to a subdivision of K4 are 3-colorable. This proves a conjecture of Trotignon and Vuskovic.
Finite temperature Casimir effect for massive scalars in a magnetic field
Creators: name: Erdas, Andrea
name: Seltzer, Kevin P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The finite temperature Casimir effect for a charged, massive scalar field confined between very large, perfectly conducting parallel plates is studied using the zeta function regularization technique. The scalar field satisfies Dirichlet boundary conditions at the plates and a magnetic field perpendicular to the plates is present. Four equivalent expressions for the zeta function are obtained, which are exact to all orders in the magnetic field strength, temperature, scalar field mass, and plate distance. The zeta function is used to calculate the Helmholtz free energy of the scalar field and the Casimir pressure on the plates, in the case of high temperature, small plate distance, strong magnetic field and large scalar mass. In all cases, simple analytic expressions of the zeta function, free energy and pressure are obtained, which are very accurate and valid for practically all values of temperature, plate distance, magnetic field and mass.
description: 13 pages, RevTeX4. arXiv admin note: text overlap with arXiv:1304.6417
Aubert, J. M., Ley de Dios, leyes de los hombres. Col. El mistério cristiano. Ed Herder. Vol. de 308 ps. 141x216. Barcelona 1969
Creators: name: Marques, José Silva
Publisher: name: Theologica
Year: 1971

description: Theologica, v. 6 n. 3 (1971)
A Kato's second type representation theorem for solvable sesquilinear forms
Creators: name: Corso, Rosario
Publisher: name: arXiv
Year: 2017
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47A07, 47A10

description: Kato's second representation theorem is generalized to solvable sesquilinear forms. These forms need not be non-negative nor symmetric. The representation considered holds for a subclass of solvable forms (called hyper-solvable), precisely for those whose domain is exactly the domain of the square root of the modulus of the associated operator. This condition always holds for closed semibounded forms, and it is also considered by several authors for symmetric sign-indefinite forms. As a consequence, a one-to-one correspondence between hyper-solvable forms and operators, which generalizes those already known, is established.
description: 20 pages
Montini, Card. J.-B., Vous les prêtres du Christ. Exhortations-Discours. Lettres aux prêtres. Ed. Saint-Paul. Vol. de 255 ps. 135x180. Paris 1969
Creators: name: Marques, José Silva
Publisher: name: Theologica
Year: 1971

description: Theologica, v. 6 n. 3 (1971)
A Survey on Solvable Sesquilinear Forms
Creators: name: Corso, Rosario
Publisher: name: arXiv
Year: 2017
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47A07, 47A10, 47A12

description: The aim of this paper is to present a unified theory of many Kato type representation theorems in terms of solvable forms on Hilbert spaces. In particular, for some sesquilinear forms $Ω$ on a dense domain $\mathcal{D}$ one looks for an expression $$ Ω(ξ,η)=\langle Tξ, η\rangle, \qquad \forall ξ\in D(T),η\in \mathcal{D}, $$ where $T$ is a densely defined closed operator with domain $D(T)\subseteq \mathcal{D}$. There are two characteristic aspects of solvable forms. Namely, one is that the domain of the form can be turned into a reflexive Banach space need not be a Hilbert space. The second one is the existence of a perturbation with a bounded form which is not necessarily a multiple of the inner product.
description: 11 pages
Transit Search from Antarctica and Chile - Comparison and Combination
Creators: name: Fruth, T.
name: Cabrera, J.
name: Csizmadia, Sz.
name: Dreyer, C.
name: Eigmüller, P.
name: Erikson, A.
name: Kabath, P.
name: Pasternacki, T.
name: Rauer, H.
name: Titz-Weider, R.
name: Abe, L.
name: Agabi, A.
name: Gonçalves, I.
name: Guillot, T.
name: Mékarnia, D.
name: Rivet, J. -P.
name: Crouzet, N.
name: Chini, R.
name: Lemke, R.
name: Murphy, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Observing sites at the East-Antarctic plateau are considered to provide exceptional conditions for astronomy. The aim of this work is to assess its potential for detecting transiting extrasolar planets through a comparison and combination of photometric data from Antarctica with time series from a midlatitude site. During 2010, the two small aperture telescopes ASTEP 400 (Dome C) and BEST II (Chile) together performed an observing campaign of two target fields and the transiting planet WASP-18b. For the latter, a bright star, Dome C appears to yield an advantageous signal-to-noise ratio. For field surveys, both Dome C and Chile appear to be of comparable photometric quality. However, within two weeks, observations at Dome C yield a transit detection efficiency that typically requires a whole observing season in Chile. For the first time, data from Antarctica and Chile have been combined to extent the observational duty cycle. This approach is both feasible in practice and favorable for transit search, as it increases the detection yield by 12-18%.
description: 22 pages, 12 figures, accepted for publication in PASP (in press)
Longitudinal Bunch Profile Diagnostics at a Laser-Driven Plasma Wakefield Acceleration Experiment
Creators: name: Brabants, Robin
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2020

description: Masterarbeit, University of Hamburg, 2020; 83 pp. (2020). = Masterarbeit, University of Hamburg, 2020
description: Plasma wakefield acceleration is a promising technique for the production and/oracceleration of high energy charged particle beams on a centimeter-scale. In suchexperiments, a strong and compact focusing of divergent electron beams can berealized with an active plasma lens. A diagnostic tool for the spectral analysis oftransition radiation was studied and designed in order to measure the longitudinalcharge distribution profile in the focus of a plasma lens. The experimental setup,consisting of an already developed spectrometer and a beamline, was installed insidethe BOND-lab which is dedicated to the research of electron beams from laser-pulsedriven wakefield experiments. Two different effects limiting the electron energyinterval for which radiation can be detected were examined. The determinationof the optical response functions for the measurement setup is described and wascarried out at a given focusing energy. First measurement attempts were undertaken,but have proven unsuccessful so far.
Chain level loop bracket and pseudo-holomorphic disks
Creators: name: Irie, Kei
Publisher: name: arXiv
Year: 2018
Subjects: subject: Symplectic Geometry (math.SG)
subject: Differential Geometry (math.DG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 53D12, 53D40, 55P50

description: Let $L$ be a Lagrangian submanifold in a symplectic vector space which is closed, oriented and spin. Using virtual fundamental chains of moduli spaces of nonconstant pseudo-holomorphic disks with boundaries on $L$, one can define a Maurer-Cartan element of a Lie bracket operation in string topology (the loop bracket) defined at chain level. This observation is due to Fukaya, who also pointed out its important consequences in symplectic topology. The goal of this paper is to work out details of this observation. Our argument is based on a string topology chain model previously introduced by the author, and the theory of Kuranishi structures on moduli spaces of pseudo-holomorphic disks, which has been developed by Fukaya-Oh-Ohta-Ono.
description: added a link to an erratum to the published version
Asymptotic and Numerical Analysis of Multiserver Retrial Queue with Guard Channel for Cellular Networks
Creators: name: Kajiwara, Kazuki
name: Phung-Duc, Tuan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Performance (cs.PF)
subject: FOS: Computer and information sciences

description: This paper considers a retrial queueing model for a base station in cellular networks where fresh calls and handover calls are available. Fresh calls are initiated from the cell of the base station. On the other hand, a handover call has been connecting to a base station and moves to another one. In order to keep the continuation of the communication, it is desired that an available channel in the new base station is immediately assigned to the handover call. To this end, a channel is reserved as the guard channel for handover calls in base stations. Blocked fresh and handover calls join a virtual orbit and repeat their attempts in a later time. We assume that a base station can recognize retrial calls and give them the same priority as that of handover calls. We model a base station by a multiserver retrial queue with priority customers for which a level-dependent QBD process is formulated. We obtain Taylor series expansion for the nonzero elements of the rate matrices of the level-dependent QBD. Using the expansion results, we obtain an asymptotic upper bound for the joint stationary distribution of the number of busy channels and that of customers in the orbit. Furthermore, we derive an efficient numerical algorithm to calculate the joint stationary distribution.
A Lebesgue-type decomposition for non-positive sesquilinear forms
Creators: name: Corso, Rosario
Publisher: name: arXiv
Year: 2018
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47A07, 15A63, 28A12, 47A12

description: A Lebesgue-type decomposition of a (non necessarily non-negative) sesquilinear form with respect to a non-negative one is studied. This decomposition consists of a sum of three parts: two are dominated by an absolutely continuous form and a singular non-negative one, respectively, and the latter is majorized by the product of an absolutely continuous and a singular non-negative forms. The Lebesgue decomposition of a complex measure is given as application.
description: 18 pages
Folding model analysis of the inelastic $α+^{12}$C scattering at medium energies, and the isoscalar transition strengths of the cluster states of $^{12}$C
Creators: name: Cuong, Do Cong
name: Khoa, Dao T.
name: Kanada-En'yo, Yoshiko
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The complex optical potential and inelastic form factor given by the folding model for the $α+^{12}$C scattering are used to calculate the ($α,α'$) cross sections for the known isoscalar states of $^{12}$C in an elaborate coupled channel approach. The strengths of the form factors for these states are then fine tuned against the ($α,α'$) data to deduce the corresponding $Eλ$ transition strengths. A significant $E2$ transition strength has been obtained for the $2^+_2$ state from the present analysis of the ($α,α'$) data measured at $E_α=240$ and 386 MeV. The $Eλ$ transition strengths of the $0^+_2,\ 3^-_1,\ 0^+_3,$ and $1^-_1$ states were also carefully deduced, and some difference from the results of earlier analyses has been found and qualitatively understood.
description: Accepted for publication in Physical Review C
Maximal operators with respect to the numerical range
Creators: name: Corso, Rosario
Publisher: name: arXiv
Year: 2018
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47A20, 47A12, 47B44, 47A07

description: Let $\mathfrak{n}$ be a nonempty, proper, convex subset of $\mathbb{C}$. The $\mathfrak{n}$-maximal operators are defined as the operators having numerical ranges in $\mathfrak{n}$ and are maximal with this property. Typical examples of these are the maximal symmetric (or accretive or dissipative) operators, the associated to some sesquilinear forms (for instance, to closed sectorial forms), and the generators of some strongly continuous semi-groups of bounded operators. In this paper the $\mathfrak{n}$-maximal operators are studied and some characterizations of these in terms of the resolvent set are given.
description: 21 pages
The Atmospheres of Earth-like Planets after Giant Impact Events
Creators: name: Lupu, R. E.
name: Zahnle, Kevin
name: Marley, Mark S.
name: Schaefer, Laura
name: Fegley, Bruce
name: Morley, Caroline
name: Cahoy, Kerri
name: Freedman, Richard
name: Fortney, Jonathan J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: It is now understood that the accretion of terrestrial planets naturally involves giant collisions, the moon-forming impact being a well known example. In the aftermath of such collisions the surface of the surviving planet is very hot and potentially detectable. Here we explore the atmospheric chemistry, photochemistry, and spectral signatures of post-giant-impact terrestrial planets enveloped by thick atmospheres consisting predominantly of CO2, and H2O. The atmospheric chemistry and structure are computed self-consistently for atmospheres in equilibrium with hot surfaces with composition reflecting either the bulk silicate Earth (which includes the crust, mantle, atmosphere and oceans) or Earth's continental crust. We account for all major molecular and atomic opacity sources including collision-induced absorption. We find that these atmospheres are dominated by H2O and CO2, while the formation of CH4, and NH3 is quenched due to short dynamical timescales. Other important constituents are HF, HCl, NaCl, and SO2. These are apparent in the emerging spectra, and can be indicative that an impact has occurred. The use of comprehensive opacities results in spectra that are a factor of 2 lower in surface brightness in the spectral windows than predicted by previous models. The estimated luminosities show that the hottest post-giant-impact planets will be detectable with near-infrared coronagraphs on the planned 30m-class telescopes. The 1-4um region will be most favorable for such detections, offering bright features and better contrast between the planet and a potential debris disk. We derive cooling timescales on the order of 10^5-10^6 Myrs, based on the modeled effective temperatures. This leads to the possibility of discovering tens of such planets in future surveys.
description: 51 pages, 16 figures, preprint format; ApJ submitted
Three Predictions: Comet 67P/Churyumov-Gerasimenko, Comet C/2012 K1 Panstarrs, and Comet C/2013 V5 Oukaimeden
Creators: name: Ferrín, Ignacio
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We make the following predictions: (1) Comet 67P/Churyumov-Gerasimenko. The Secular Light Curve (SLC) of this comet exhibits a photometric anomaly in magnitude that is present in 1982, 1996, 2002 and 2009. Thus it must be real. We interpret this anomaly as a topographic feature on the surface of the nucleus that may be a field of debris, a region made only of dust or an area of solid stones but in any case it is depleted in volatiles. We predict that images taken by spacecraft Rosseta will show a region morphologically different to the rest of the nucleus, at the pole pointing to the Sun near perihelion. (2) Comet C/2012 K1 Panstarrs. This comet exhibits the same Slope Discontinuity Event (SDE)+magnitude dip after the event than 11 other comets listed in Table 1 all of which disintegrated. This group includes comet C/2012 S1 ISON. Thus it is reasonable to expect that this comet may disintegrate too. The probability of disintegration of this comet is 20%. (3) Comet C/2013 V5 Oukaimeden. This comet exhibits the same SDE+dip signature exhibited by 11 other comets in Table 1 all of which disintegrated. This group includes comet C/2012 S1 ISON. We predict that there is a 90% probability that this comet will disintegrate.
description: 8 pages, 4 Figures, 1 Table, submitted for publication
Improved 3-Dimensional Security in Cloud Computing
Creators: name: Tirodkar, Sagar
name: Baldawala, Yazad
name: Ulane, Sagar
name: Jori, Ashok
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cryptography and Security (cs.CR)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Cloud computing is a trending technology in the field of Information Technology as it allows sharing of resources over a network. The reason Cloud computing gained traction so rapidly was because of its performance, availability and low cost among other features. Besides these features, companies are still refraining from binding their business with cloud computing due to the fear of data leakage. The focus of this paper is on the problem of data leakage. It proposes a framework which works in two phases. The first phase consists of data encryption and classification which is performed before storing the data. In this phase, the client may want to encrypt his data prior to uploading. After encryption, data is classified using three parameters namely Confidentiality [C], Integrity [I] and Availability [A]. With the help of proposed algorithm, criticality rating (Cr) of the data is calculated. According to the Cr, security will be provided on the basis of the 3 Dimensions proposed in this paper. The second phase consists of data retrieval by the client. As per the concept of 3D, users who want to access their data need to be authenticated, to avoid data from being compromised. Before every access to data, the users identity is verified for authorization. After the user is authorized for data access, if the data is encrypted, the user can decrypt the same.
description: 6 Pages, 10 Figures, Published with International Journal of Computer Trends and Technology (IJCTT)
Sesquilinear forms associated to sequences on Hilbert spaces
Creators: name: Corso, Rosario
Publisher: name: arXiv
Year: 2018
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 42C15, 47A07, 47A05, 46C05

description: The possibility of defining sesquilinear forms starting from one or two sequences of elements of a Hilbert space is investigated. One can associate operators to these forms and in particular look for conditions to apply representation theorems of sesquilinear forms, such as Kato's theorems. The associated operators correspond to classical frame operators or weakly-defined multipliers in the bounded context. In general some properties of them, such as the invertibility and the resolvent set, are related to properties of the sesquilinear forms. As an upshot of this approach new features of sequences (or pairs of sequences) which are semi-frames (or reproducing pairs) are obtained.
description: 25 pages
Frames and weak frames for unbounded operators
Creators: name: Bellomonte, Giorgia
name: Corso, Rosario
Publisher: name: arXiv
Year: 2018
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 42C15, 47A05, 47A63, 41A65

description: In 2012 Găvruţa introduced the notions of $K$-frame and of atomic system for a linear bounded operator $K$ in a Hilbert space $\mathcal{H}$, in order to decompose its range $\mathcal{R}(K)$ with a frame-like expansion. In this article we revisit these concepts for an unbounded and densely defined operator $A:\mathcal{D}(A)\to\mathcal{H}$ in two different ways. In one case we consider a non-Bessel sequence where the coefficient sequence depends continuously on $f\in\mathcal{D}(A)$ with respect to the norm of $\mathcal{H}$. In the other case we consider a Bessel sequence and the coefficient sequence depends continuously on $f\in\mathcal{D}(A)$ with respect to the graph norm of $A$.
description: 24 pages