cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Complex Conjugate Pairs in Stationary Sturmians
Creators: name: Dortmans, P. J.
name: Canton, L.
name: Pisent, G.
name: Amos, K.
Publisher: name: arXiv
Year: 1993
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Sturmian eigenstates specified by stationary scattering boundary conditions are particularly useful in contexts such as forming simple separable two nucleon t matrices, and are determined via solution of generalised eigenvalue equation using real and symmetric matrices. In general, the spectrum of such an equation may contain complex eigenvalues. But to each complex eigenvalue there is a corresponding conjugate partner. In studies using realistic nucleon--nucleon potentials, and in certain positive energy intervals, these complex conjugated pairs indeed appear in the Sturmian spectrum. However, as we demonstrate herein, it is possible to recombine the complex conjugate pairs and corresponding states into a new, sign--definite pair of real quantities with which to effect separable expansions of the (real) nucleon--nucleon reactance matrices.
description: (REVTEX) 8 Pages, Padova DFPD 93/TH/78 and University of Melbourne
Calculus of Variations
Creators: name: Fonseca, Irene
name: Leoni, Giovanni
Publisher: name: Carnegie Mellon University
Year: 2013
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: The calculus of variations is a branch of mathematical analysis that studies extrema and critical points of functionals (or energies). Here, by functional we mean a mapping from a function space to the real numbers
Superefficient electric-field-induced spin splitting in strained p-type quantum wells
Creators: name: Gvozdic, D. M.
name: Ekenberg, U.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigate theoretically the efficiency of the Rashba effect, i.e. the spin splitting resulting from an electric field. This is the mechanism behind the Datta-Das spin transistor. In the research efforts so far the carriers have usually been taken to be electrons. Here we demonstrate remarkable improvements by several orders of magnitude by utilising holes instead. We also show that the frequently neglected lattice-mismatch between GaAs and AlGaAs can be used to further enhance the efficiency of the spin splitting mechanism. An inverse Rashba effect is also demonstrated.
description: 13 pages, 3 figures
Testing in Texas : the influence of accountability on elementary science in one small town
Creators: name: Atwood, Erin Denise
Publisher: name: The University of Texas at Austin
Year: 2005
Subjects: subject: Science--Study and teaching (Elementary)--Texas
subject: Educational tests and measurements--Texas

description: The purpose of this paper was to look at the impact of testing on the science at the elementary level since the implementation of the Texas Assessment of Knowledge and Skills test for science at the fifth grade level. This was an ethnographic study that focused on this influence at a specific rural elementary school in Texas. While the impact of testing in prevalent, its effects on science instruction are limited. Through observation, interviews, and the collection of teacher lesson plans, a themes other than testing emerged. Teachers at this rural elementary school identify more pressing challenges in the form of time, planning, and materials with regards to science
Autobiography
Creators: name: Ridge, Eleanor
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: Vatlongos
subject: tvk

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Doctoral thesis recital (collaborative piano)
Creators: name: Lu, Chien-Lin
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Sonatas (Flute and piano)
Songs (High voice) with piano

description: Troisieme sonata pour flute et piano / Philippe Gaubert -- Le printemps ; Tyndaris / Reynaldo Hahn -- Sonata for flute and piano, op. 23 / Lowell Liebermann -- Drei Lieder der Ophelia : op. 67 / Richard Strauss -- Les adieux de Marie Stuart : WWV 61 / Richard Wagner
Late Quaternary geomorphic evolution of the Colorado River, Bastrop and Fayette counties, Texas
Creators: name: Looney, Robert Michael
Publisher: name: The University of Texas at Austin
Year: 1977
Subjects: subject: Geomorphology
subject: Texas
subject: Bastrop County
subject: Fayette County
subject: Colorado River
subject: Maps
subject: Late Quaternary
subject: Utley
subject: La Grange
subject: Sediments
subject: Channel morphology
subject: Flood plain morphology
subject: Geomorphology--Texas--Bastrop County
subject: Geomorphology--Texas--Fayette County
subject: Geomorphology--Colorado River (Colo.-Mexico)

description: Ancient and modern flood plain and channel morphology was mapped in the late Quaternary alluvial valley of the Colorado River between Utley and La Grange, Texas. The analysis of N.A.S.A.-generated color aerial infrared photography, SKYLAB remote sensing imagery, and aerial panchromatic photography revealed nine assemblages of fluvial channel patterns. The paleochannels occur on multiple flood plain and terrace levels and are associated with deposits with variable textures, sedimentary structures, and lithologic composition. Quantitative geomorphic analysis showed that bankfull width for the late Quaternary Colorado River varied from 450 m to 200 m, meander wavelength from 575 m to 1730 m, and sinuosity from 1.3 to 3.6. The channel adjustments from low sinuosity to high sinuosity streams was accompanied by a decrease in meander wavelength and bankfull width. Sedimentological analyses show corresponding changes in grain size from sand and gravel to sand and silt transporting streams. The nine channel assemblages of the Colorado River reflect changes in runoff and sediment load characteristics from upstream catchment areas. These runoff and sediment load changes correlate with an alternating arid-humid climate in central Texas during the late Quaternary. The resulting hypothesis is that channel 7 is pre-Wisconsinan; channels 6, 6A, and 6B are Wisconsinan; channel 5 is a dry period at the beginning of the Holocene; channel 4 is a humid Holocene phase; and channel 3 to the modern channel are the most recent Holocene fluctuations. Sedimentary structures and paleo-hydrologic implications indicate that channels 7 and 6 were laid down by broad, shallow braided streams, Channels 6A and 5 were either braided or coarse meander belt fluvial systems. The small channel width, meander wavelength, and low sinuosity indicates that channels 6B and 4 operated as fine grained meander belt fluvial systems. Channels 3 and 2 are similar to the modern Colorado River which is a bed-load (high bed-load/discharge ratio) stream transporting coarse sand and pebble-to-cobble gravel
On choosing the start time of binary black hole ringdown
Creators: name: Bhagwat, Swetha
name: Okounkova, Maria
name: Ballmer, Stefan W.
name: Brown, Duncan A.
name: Giesler, Matthew
name: Scheel, Mark A.
name: Teukolsky, Saul A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The final stage of a binary black hole merger is ringdown, in which the system is described by a Kerr black hole with quasinormal mode perturbations. It is far from straightforward to identify the time at which the ringdown begins. Yet determining this time is important for precision tests of the general theory of relativity that compare an observed signal with quasinormal mode descriptions of the ringdown, such as tests of the no-hair theorem. We present an algorithmic method to analyze the choice of ringdown start time in the observed waveform. This method is based on determining how close the strong field is to a Kerr black hole (Kerrness). Using numerical relativity simulations, we characterize the Kerrness of the strong-field region close to the black hole using a set of local, gauge-invariant geometric and algebraic conditions that measure local isometry to Kerr. We produce a map that associates each time in the gravitational waveform with a value of each of these Kerrness measures; this map is produced by following outgoing null characteristics from the strong and near-field regions to the wave zone. We perform this analysis on a numerical relativity simulation with parameters consistent with GW150914- the first gravitational wave detection. We find that the choice of ringdown start time of $3\,\mathrm{ms}$ after merger used in the GW150914 study to test general relativity corresponds to a high dimensionless perturbation amplitude of $ \sim 7.5 \times 10^{-3}$ in the strong-field region. This suggests that in higher signal-to-noise detections, one would need to start analyzing the signal at a later time for studies that depend on the validity of black hole perturbation theory.
description: 23+4 pages, 22 figures
An introduction
Creators: name: Ridge, Eleanor
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: Vatlongos
subject: tvk

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Temporal coupled-mode theory in nonlinear resonant photonics: From basic principles to contemporary systems with 2D materials, dispersion, loss, and gain
Creators: name: Christopoulos, Thomas
name: Tsilipakos, Odysseas
name: Kriezis, Emmanouil E.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Temporal coupled-mode theory (CMT) is an acclaimed and widely used theoretical framework for modeling the continuous wave (CW) response and temporal dynamics of any integrated or free-space photonic resonant structure. It was initially employed to understand how energy is coupled into and out of a cavity and how it is exchanged between different resonant modes. In the 30 years that followed its establishment, CMT has been expanded to describe a broad range of nonlinear interactions as well (self- and cross-phase modulation, saturable absorption, frequency generation, gain, etc.). In this tutorial, we thoroughly present the basic principles and the evolution of CMT throughout the years, showcasing its immense capabilities for the analysis and design of linear and nonlinear resonant photonic systems. Importantly, we focus on examples of modern, open nanophotonic resonators incorporating contemporary bulk or sheet (2D) materials that may be lossy and dispersive. For each linear/nonlinear effect under study we follow a meticulous, step-by-step approach, starting from an accurate model of the physical phenomenon and proceeding to its introduction in the CMT framework all the way to the efficient solution of the resulting system of equations. Our work highlights the merits of CMT as an efficient, accurate, and versatile theoretical tool. We envision that it can serve both as an introductory reference for any reader, as well as a comprehensive handbook on how to incorporate a broad range of linear and nonlinear effects in the CMT framework.
On ${\cal Z}_p$-norms of random vectors
Creators: name: Latała, Rafał
Publisher: name: arXiv
Year: 2017
Subjects: subject: Probability (math.PR)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 60E15, 46B09

description: To any $n$-dimensional random vector $X$ we may associate its $L_p$-centroid body ${\cal Z}_p(X)$ and the corresponding norm. We formulate a conjecture concerning the bound on the ${\cal Z}_p(X)$-norm of $X$ and show that it holds under some additional symmetry assumptions. We also relate our conjecture with estimates of covering numbers and Sudakov-type minorization bounds.
description: 14 pages
Education in Mele Maat
Creators: name: Ridge, Eleanor
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: Vatlongos
subject: tvk

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Open problems in mathematical physics
Creators: name: Coley, Alan A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: History and Overview (math.HO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: History and Philosophy of Physics (physics.hist-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We present a list of open questions in mathematical physics. After a historical introduction, a number of problems in a variety of different fields are discussed, with the intention of giving an overall impression of the current status of mathematical physics, particularly in the topical fields of classical general relativity, cosmology and the quantum realm. This list is motivated by the recent article proposing 42 fundamental questions (in physics) which must be answered on the road to full enlightenment. But paraphrasing a famous quote by the British football manager Bill Shankly, in response to the question of whether mathematics can answer the Ultimate Question of Life, the Universe, and Everything, mathematics is, of course, much more important than that.
Microstructure analysis of bismuth absorbers for transition-edge sensor X-ray microcalorimeters
Creators: name: Yan, Daikang
name: Divan, Ralu
name: Gades, Lisa M.
name: Kenesei, Peter
name: Madden, Timothy J.
name: Miceli, Antonino
name: Park, Jun-Sang
name: Patel, Umeshkumar M.
name: Quaranta, Orlando
name: Sharma, Hemant
name: Bennett, Douglas A.
name: Doriese, William B.
name: Fowler, Joseph W.
name: Gard, Johnathon
name: Hays-Wehle, James
name: Morgan, Kelsey M.
name: Schmidt, Daniel R.
name: Swetz, Daniel S.
name: Ullom, Joel N.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Transition-edge sensors (TESs) as microcalorimeters offer high resolving power, owning to their sharp response and low operating temperature. In the hard X-ray regime and above, the demand for high quantum-efficiency requires the use of absorbers. Bismuth (Bi), owing to its low heat carrier density and high X-ray stopping power, has been widely used as an absorber material for TESs. However, distinct spectral responses have been observed for Bi absorbers deposited via evaporation versus electroplating. Evaporated Bi absorbers are widely observed to have a non-Gaussian tail on the low energy side of measured spectra. In this study, we fabricated Bi absorbers via these two methods, and performed microstructure analysis using scanning electron microscopy (SEM) and X-ray diffraction microscopy. The two types of material showed the same crystallographic structure, but the grain size of the evaporated Bi was about 40 times smaller than that of the electroplated Bi. This distinction in grain size is likely to be the cause of their different spectral responses.
On the nature of the large-$q$ expansion of the response for a non-relativistic confined system
Creators: name: Pace, E.
name: Salme, G.
name: Rinat, A. S.
Publisher: name: arXiv
Year: 1993
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We show the equivalence of a previously derived exact expression for the response of a non-relativistic system with harmonic forces and an infinite sum of weighted $δ$-functions corresponding to the spectrum. We forward arguments, indicating that the Gersch-Rodriguez-Smith $1/q$-expansion of the response does not converge and prove that this expansion is an asymptotic series.
description: 8 pages, appended ps file for figs, report no's INFN-ISS 93/9; WIS-93/71/Nov-PH
Delineation of the ground-water flow systems of the Eagle Flat and Red Light Basins of Trans-Pecos Texas
Creators: name: Darling, Bruce Kelley, 1951-
Publisher: name: The University of Texas at Austin
Year: 1997
Subjects: subject: Groundwater
subject: Groundwater flow
subject: Trans-Pecos
subject: Texas
subject: Eagle Flat Basin
subject: Red Light Basin
subject: Hydrogeology
subject: Groundwater flow--Trans-Pecos (Tex. and N.M.)
subject: Groundwater--Trans-Pecos (Tex. and N.M.)
subject: Hydrogeology--Trans-Pecos (Tex. and N.M.)

description: The hydrogeologic systems of the Eagle Flat and Red Light basins of Trans-Pecos are characterized by three-dimensional flow components, fracture and double-porosity flow, hydrochemically zoned water in alternating permeable and low-permeability rocks and poorly consolidated strata, and areal transitions between unconfined, confined, and leaky-confined aquifers. Ground-water depths greater than 900 ft (275 m) beneath the topographically lowest areas of the Eagle Flat Basin, along with closed potentiometric contours suggest drainage to a regional flow system that transports ground water beyond basin boundaries, probably beneath the Devil Ridge ground-water divide and the thick Tertiary basin fill deposits of the Red Light Basin, where hydraulic head along the Rio Grande is as much as 400 ft (122 m) below the lowest point of the potentiometric surface in the Eagle Flat Basin. Radiocarbon is unreliable as estimator of absolute age. This is attributable to contributions of dead carbon by the dissolution of carbonate rocks and/or to isotope exchange. Mixing with younger (tritiated) ground waters adds to the complexity. δ¹⁸O values of the apparently oldest ground waters, however, are about 3%₀ (SMOW) lower than those of demonstrably modem ground waters. This pattern is thought to be consistent with the influence of precipitation under an older and probably cooler climatic regime. This suggests that the oldest ground waters may have late Pleistocene recharge dates (e.g., 10,000 to 20,000 years). In addition, the temperature-fractionation gradient for δ¹⁸O suggests precipitation under climatic conditions that were from 5.5 to 7.3°C below those of average Holocene values. Isotopic data indicate that major recharge areas are focused in the upper elevations of the mountains and along mountain fronts. Recharge attributable to precipitation does not occur in the flats and draws, except where shallow water-table conditions exist in alluvial deposits adjacent to the Rio Grande. Low-permeability late-stage calcic soils limit the potential for precipitation recharge across the broad alluvial fans of the Eagle Mountains and the Indio Mountains. Estimates of precipitation recharge derived from a numerical flow model are about 0.07 in per year, or about 14% of estimates by the U.S. Geological Survey
A novel control strategy to neutralize heat source within solid oxide electrolysis cell (SOEC) under variable solar power conditions
Creators: name: Liang, Zhaojian
name: Chen, Shanlin
name: Ni, Meng
name: Wang, Jingyi
name: Li, Mengying
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The integration of a solid oxide electrolysis cell (SOEC) with a photovoltaic (PV) system presents a viable method for storing variable solar energy through the production of green hydrogen. To ensure the SOEC's safety and longevity amidst dramatic fluctuations in solar power, control strategies are needed to limit the temperature gradients and rates of temperature change within the SOEC. Recognizing that the reactant supply influences the current, a novel control strategy is developed to modulate heat generation in the SOEC by adjusting the fuel flow rate. The effectiveness of this strategy is assessed through numerical simulations conducted on a coupled PV-SOEC system using actual solar irradiance data, recorded at two-second intervals, to account for rapid changes in solar exposure. The results indicate that conventional control strategies, which increase airflow rates, are inadequate in effectively suppressing the rate of temperature variation in scenarios of drastic solar power changes. In contrast, our proposed strategy demonstrates successful management of the SOEC's heat generation, thereby reducing the temperature gradient and rate of variation within the SOEC to below 5 K/cm and 1 K/min, respectively.
Enhanced Magnetic Anisotropy of Mn12-acetate
Creators: name: Seo, D. M.
name: Meenakshi, V.
name: Teizer, W.
name: Zhao, H.
name: Dunbar, K. R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Thin films of the Single Molecule Magnet (Mn12-acetate) have been fabricated on a Si-substrate by the Dip-and-Dry method, a simple and robust technique. Atomic force microscopy and X-ray photoelectron spectroscopy characterizations reveal that homogeneous, thin films of a few molecular layers with smoothness at the molecular level are deposited. Significant changes in magnetic properties of Mn12-acetate exposed to the same solvent were observed in zero-field-cooled and field-cooled magnetization, as well as ac-susceptibility measurements. The blocking temperature was found to increase to TB > 10 K at low magnetic fields, indicating an enhanced magnetic anisotropy.
description: 14 pages, 4 figures
Construction of deep-water deposits by subaqueous-transitional flows
Creators: name: Koo, Woong Mo
Publisher: name: The University of Texas at Austin
Year: 2018
Subjects: Subaqueous-transitional flow
Physical modeling
Remobilization
Transitional-flow deposit
Geometry of lobate deposit
Flow-substrate interaction
Stacking patterns of lobate deposit

description: Understanding the transitional-sediment-gravity flow is essential to predicting the quality of hydrocarbon reservoirs because the transitional flow is an important carrier of muddy sands into deep water. I studied the deposition and reworking processes in transitional flows, and I investigated how these sedimentary processes produce divergent stratigraphy patterns of deep-water deposits. Physical experiments were conducted in a three-dimensional tank for observing transitional flows and their deposits directly under the known boundary conditions. The experiment data from the series of single-event flows demonstrated that two types of remobilizations occur in single-event transitional flows. In the early stage of a flow, the autogenic remobilization occurs via sliding on a muddy layer lubricated by a dewatering basal sand layer. In the late stage, a flow overrunning the initial deposit without lubricating layers drags the underlying deposit. These remobilizations in a single transitional flow produce the basal sand and capping mud couplets that are similar to interpreted turbidite-debrite-like couplets in nature systems. The data also demonstrates that the sediment concentrations explain the overall simplicity of lobate deposits (i.e., geometries of deposits), but the autogenic remobilizations in a single flow increase the complexity of deposits (i.e., morphology and lithofacies of deposits). The data from sequentially generated two transitional flows presented the spatial stacking pattern of deposits. The acoustic data and cores demonstrates that the rheology of a flow changes as a result of interaction with substrates. The rheology change results in the hybrid-stepping of litholofacies boundaries in deposits. The hybrid-stepping is characterized by an advancing deposit margin and a retreating sand margin of a bed when compared with those of older beds. Conceptual models for the stacking of transitional flow deposits demonstrate that identical transitional flows can develop divergent stratigraphies depending on the consolidation of muddy substrates
title: Inventaire des titres de propriété et des actes concernant les droits de l'abbaye de Morimond, Manuscrit n° 1, Bibliothèque municipale de Bourbonne-les-Bains, f.024
Creators: name: Rouzeau, Benoît
name: Rouzeau, Benoît
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2021
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: cistercien
subject: cartulaire

description: Inventaire des titres de propriété et des actes concernant les droits de l'abbaye de Morimond, Manuscrit n° 1, Bibliothèque municipale de Bourbonne-les-Bains. Numérisation en mode image
description: Relation: https://cisterciensetressources.lamop.fr/
description: Bibliographic citation: Inventaire des titres de propriété et des actes concernant les droits de l'abbaye de Morimond, Manuscrit n° 1, Bibliothèque municipale de Bourbonne-les-Bains, f.024, in Projet Cisterciens et Ressources [Ressource en ligne], https://cisterciensetressources.lamop.fr
description: Inventaire des titres de propriété et des actes concernant les droits de l'abbaye de Morimond, Manuscrit n° 1, Bibliothèque municipale de Bourbonne-les-Bains, f. 024
Physics-Aware Multifidelity Bayesian Optimization: a Generalized Formulation
Creators: name: Di Fiore, Francesco
name: Mainini, Laura
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: The adoption of high-fidelity models for many-query optimization problems is majorly limited by the significant computational cost required for their evaluation at every query. Multifidelity Bayesian methods (MFBO) allow to include costly high-fidelity responses for a sub-selection of queries only, and use fast lower-fidelity models to accelerate the optimization process. State-of-the-art methods rely on a purely data-driven search and do not include explicit information about the physical context. This paper acknowledges that prior knowledge about the physical domains of engineering problems can be leveraged to accelerate these data-driven searches, and proposes a generalized formulation for MFBO to embed a form of domain awareness during the optimization procedure. In particular, we formalize a bias as a multifidelity acquisition function that captures the physical structure of the domain. This permits to partially alleviate the data-driven search from learning the domain properties on-the-fly, and sensitively enhances the management of multiple sources of information. The method allows to efficiently include high-fidelity simulations to guide the optimization search while containing the overall computational expense. Our physics-aware multifidelity Bayesian optimization is presented and illustrated for two classes of optimization problems frequently met in science and engineering, namely design optimization and health monitoring problems.
Zeno effect of the open quantum system in the presence of 1/f noise
Creators: name: He, Shu
name: Wang, Chen
name: Duan, Li-Wei
name: Chen, Qing-Hu
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the quantum Zeno effect (QZE) and quantum anti-Zeno effect (QAZE) in a two-level system(TLS) interacting with an environment owning 1/f noise. Using a numerically exact method based on the thermo field dynamics(TFD) theory and the matrix product states(MPS), we obtain exact evolutions of the TLS and bath(environment) under repetitive measurements at both zero and finite temperatures. At zero temperature, we observe a novel transition from a pure QZE in the short time scale to a QZE-QAZE crossover in the long time scale, by considering the measurement induced non-Markvoian effect. At finite temperature, we exploit that the thermal fluctuation suppresses the decay of the survival probability in the short time scale, whereas it enhances the decay in the long time scale.
description: 9 pages, 6 figures
Contextualizing the evolution of theropod dinosaurs in western North America using U-Pb geochronology of the Chinle Formation and Kayenta Formation on the Colorado Plateau
Creators: name: Marsh, Adam Douglas
name: 0000-0002-3223-8940
Publisher: name: The University of Texas at Austin
Year: 2018
Subjects: Chinle
Kayenta
Theropod
Geochronology
Dilophosaurus
Chindesaurus
Triassic
Jurassic

description: The Chinle Formation and Glen Canyon Group represent one of the most complete terrestrial sedimentary sequences of the Late Triassic and Early Jurassic epochs in the world. This time period spans the end-Triassic mass extinction and the Triassic-Jurassic boundary, and the rocks preserve fossils that include some of the earliest members of extant vertebrate groups. While the Late Triassic age of the Chinle Formation is well-supported thanks to extensive radioisotopic dating, the fossiliferous Kayenta Formation lacks tuffaceous units with which to determine U-Pb ages. Further, the evolutionary relationships of certain vertebrate taxa from the Chinle Formation and Kayenta Formation are not well known. My work helps to contextualize the evolution of early theropod dinosaurs by describing and estimating the evolutionary relationships of Late Triassic and Early Jurassic theropods. In addition, U-Pb detrital zircon geochronology provides chronostratigraphic ages for early Mesozoic sedimentary units on the Colorado Plateau, and a basis for time-calibrating phylogenies of taxa living at that time. The redescription of the holotype specimen of Chindesaurus bryansmalli corrects historical identifications, identifies previously-unknown elements, and provides novel morphological characters. Chindesaurus bryansmalli is the sister taxon to the non-neotheropod Tawa hallae and is not a herrerasaurid. Missing data in the form of incomplete specimens does not alter tree topology of early theropods. U-Pb detrital zircon ages support the lithostratigraphic correlation of the Sonsela Sandstone bed near the Sonsela Buttes in northeastern Arizona to the Jasper Forest bed within the Sonsela Member of the Chinle Formation at Petrified Forest National Park. A reassessment and description of every specimen of Dilophosaurus wetherilli reveals novel characteristics of the cranial crest unique to Dilophosaurus as well as apomorphic serial variation in the cervical vertebral laminae that may be associated with an increase in body size, and the evolution of the avian air sac system. All specimens of Dilophosaurus wetherilli form a clade of non-averostran neotheropods and support the monotypy of the taxon. U-Pb detrital zircon geochronology of the Kayenta Formation indicates a Sinemurian-Toarcian age and support the hypothesis that Cordilleran arc-derived zircons are excluded from the upper part of the Kayenta Formation where it interfingers with the Navajo Sandstone erg sands
Odd order cases of the logarithmically averaged Chowla conjecture
Creators: name: Tao, Terence
name: Teräväinen, Joni
Publisher: name: arXiv
Year: 2017
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11N37

description: A famous conjecture of Chowla states that the Liouville function $λ(n)$ has negligible correlations with its shifts. Recently, the authors established a weak form of the logarithmically averaged Elliott conjecture on correlations of multiplicative functions, which in turn implied all the odd order cases of the logarithmically averaged Chowla conjecture. In this note, we give a new and shorter proof of the odd order cases of the logarithmically averaged Chowla conjecture. In particular, this proof avoids all mention of ergodic theory, which had an important role in the previous proof.
description: 15 pages, no figures, submitted, J. Numb. Thy. Bordeaux
Bounds on equiangular lines and on related spherical codes
Creators: name: Bukh, Boris
Publisher: name: Carnegie Mellon University
Year: 2015
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: An L-spherical code is a set of Euclidean unit vectors whose pairwise inner products belong to the set L. We show, for a fixed α,β>0, that the size of any [−1,−β]∪{α}-spherical code is at most linear in the dimension.
In particular, this bound applies to sets of lines such that every two are at a fixed angle to each another.
Estimating Spectra from Photometry
Creators: name: Kalmbach, J. Bryce
name: Connolly, Andrew J.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Measuring the physical properties of galaxies such as redshift frequently requires the use of Spectral Energy Distributions (SEDs). SED template sets are, however, often small in number and cover limited portions of photometric color space. Here we present a new method to estimate SEDs as a function of color from a small training set of template SEDs. We first cover the mathematical background behind the technique before demonstrating our ability to reconstruct spectra based upon colors and then compare to other common interpolation and extrapolation methods. When the photometric filters and spectra overlap we show reduction of error in the estimated spectra of over 65% compared to the more commonly used techniques. We also show an expansion of the method to wavelengths beyond the range of the photometric filters. Finally, we demonstrate the usefulness of our technique by generating 50 additional SED templates from an original set of 10 and applying the new set to photometric redshift estimation. We are able to reduce the photometric redshifts standard deviation by at least 22.0% and the outlier rejected bias by over 86.2% compared to original set for z $\leq$ 3.
description: 23 pages, 9 figures, accepted to AJ
Polarization in Sagittarius A*
Creators: name: Bower, Geoffrey C.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We summarize the current state of polarization observations of Sagittarius A*, the compact radio source and supermassive black hole candidate in the Galactic Center. These observations are providing new tools for understanding accretion disks, jets and their environments. Linear polarization observations have shown that Sgr A* is unpolarized at frequencies as high as 86 GHz. However, recent single-dish observations indicate that Sgr A* may have strong linear polarization at frequencies higher than 150 GHz. Circular polarization, which was recently discovered in Sgr A*, is detectable to frequencies as high as 43 GHz. It is strongly variable on a 10-day timescale, with the degree of variability increasing with frequency. At low frequencies, fractional circular polarization is stable over nearly 20 years. We discuss some of the possible models for the origin of the circular polarization.
description: Invited Article, 5 pages, 1 figure
Lettre de Philippe François Emmanuel Fourmault à Jean-François Séguier, 1775-01-19
Creators: name: Fourmault, Philippe François Emmanuel
name: Fourmault, Philippe François Emmanuel
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2021

description: [transcription] A Montmajour par Arles, Provence

Ce 19 de 1775.

[Fourmault]

Monsieur,

J'apprends de nos Mrs D. Custri et D. Paléas que notre P. visiteur ayant passé rapidement à Nîmes n'a pu avoir l'avantage de vous rendre la visite. Il a perdu, et moi surtout, beaucoup à cela. Je connais vos bontés pour moi et j'ai éprouvé combien votre nom seul honore et protège celui qui peut s'avouer de vous. Quel courage ne doit pas animer, de quelle émulation ne doit point être rempli un disciple annoncé et favorisé par votre suffrage ? c'est à ce titre glorieux [fol. 30 v] que je dois toute la satisfaction que j'ai goûtée l'année dernière. c'est à lui que je devais tous les succès qui m'attendent dans la vaste carrière que vous m'avez ouverte par tous les secours que vous me procurer. Je n'épargnerai ni peine ni application pour mériter vos soins et vos éloges., la seule gloire que j'ambitionne.

J'ai l'honneur d'être avec le plus respectueux attachement,

Monsieur,

Votre très humble et très obéissant serviteur

Fourmault
description: [note autre main] [Fourmault]
description: [personnes citées] Dom Paléas, Dom Custri, Père Visiteur provincial de la congrégation de Saint-Maur
description: Source: [lieu de Conservation] Nîmes, Bibliothèque Carré d'Art [cote]ms. 94_2, fol. 30-31
description: Source: ark:/12148/btv1b10015072g
Updated three-body model of $^6$He $β$ decay into the $α$ + $d$ continuum
Creators: name: Tursunov, E. M.
name: Baye, D.
name: Descouvemont, P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The $β$-decay process of the $^6$He halo nucleus into the $α+d$ continuum is studied in an updated three-body model. The $^6$He nucleus is described as an $α+n+n$ system in hyperspherical coordinates on a Lagrange-mesh. The shape and absolute values of the transition probability per time and energy units of new experiments are reproduced with a modified $α+d$ potential. The obtained total transition probabilities are $2.48 \times 10^{-6}$ s$^{-1}$ for the full energy region and $2.40 \times 10^{-6}$ s$^{-1}$ for the cut-off $E>150$ keV. The strong cancellation between the internal and halo parts of the $β$ decay matrix element is a challenge for future {\it ab initio} calculations.
description: 4 pages, 3 figures
Representation of hysteresis operators for vector-valued continuous monotaffine input functions by functions on strings
Creators: name: Klein, Olaf
Publisher: name: Weierstrass Institute
Year: 2012
Subjects: subject: hysteresis Operators
subject: vectorial hysteresis
subject: string representation
subject: 47J40

description: In Brokate-Sprekels-1996, it was shown that scalar-valued hysteresis operators for scalar-valued continuous piecewise monotone input functions can be uniquely represented by functionals defined on the set of all finite alternating strings of real numbers. Using this representation, various properties of these hysteresis operators were investigated. In this work, it is shown that a similar representation result can be derived for hysteresis operators dealing with inputs in a general topological linear vector space. Introducing a new class of functions, the so-called emphmonotaffine functions, which can be considered as a vector generalization of monotone scalar functions, and the convexity triple free strings on a vector space as a generalization of the alternating strings allows to formulate the corresponding representation result. As an example for the application of the representation result, a vectorial formulation of the second and third Madelung rule are discussed.
Variational estimation of the large scale time dependent meridional circulation in the Sun: proofs of concept with a solar mean field dynamo model
Creators: name: Hung, Ching Pui
name: Brun, Allan Sacha
name: Fournier, Alexandre
name: Jouve, Laurène
name: Talagrand, Olivier
name: Zakari, Mustapha
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present in this work the development of a solar data assimilation method based on an axisymmetric mean field dynamo model and magnetic surface data, our mid-term goal is to predict the solar quasi cyclic activity. Here we focus on the ability of our algorithm to constrain the deep meridional circulation of the Sun based on solar magnetic observations. To that end, we develop a variational data assimilation technique. Within a given assimilation window, the assimilation procedure minimizes the differences between data and the forecast from the model, by finding an optimal meridional circulation in the convection zone, and an optimal initial magnetic field, via a quasi-Newton algorithm. We demonstrate the capability of the technique to estimate the meridional flow by a closed-loop experiment involving 40 years of synthetic, solar-like data. By assimilating the synthetic magnetic proxies annually, we are able to reconstruct a (stochastic) time-varying meridional circulation which is also slightly equatorially asymmetric. We show that the method is robust in estimating a flow whose level of fluctuation can reach 30% about the average, and that the horizon of predictive capability of the method is of the order of 1 cycle length.
description: Accepted for publication in ApJ. 23 figures, 20 pages. 1 Institut de Physique du Globe de Paris, 75005 Paris, France, 2 AIM/SAp CEA-Saclay, 91191 Gif-Sur-Yvette, France, 3 Institut de Recherche en Astrophysique et Plan\'{e}tologie, 31028 Toulouse, France, 4 Laboratoire de m\'{e}t\'{e}orologie dynamique, Ecole Normale Sup\'{e}rieure, Paris, France
Running a business
Creators: name: Ridge, Eleanor
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: Vatlongos
subject: tvk

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Bounds and extremal microstructures for two-component composites : a unified treatment based on the translation method
Creators: name: Grabovsky, Yury
Publisher: name: Carnegie Mellon University
Year: 1994
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: Abstract: "The overall energy or stiffness of an elastic composite depends on the microgeometry. Recently there has been a lot of work on 'extremal microstructures' for elastic composites, for example microstructures which minimize the elastic energy at a given macroscopic strain. However, most attention has been focused on composites made of the elastically isotropic component materials. Breaking with this tradition we consider composites made of two fully anisotropic phases. Our approach, based on the well-known translation method, provides not only the energy bound but also necessary and sufficient conditions for optimality in terms of the local strain field. These optimality conditions enable us to find optimal microstructures in a more systematic way than before. They also provide clarification of the relations between different problems, for example bounding effective conductivity of a conducting composite versus minimizing strain energy of an elastic composite. Our analysis shows that anisotropy of the constituent materials is very important in determining optimal microgeometries. Some constructions of extremal matrix-inclusion composites made from isotropic components cease to be available when the matrix material is anisotropic, even when the degree of anisotropy is small."
Coherence-incoherence patterns in a ring of non-locally coupled phase oscillators
Creators: name: Omel'chenko, Oleh
Publisher: name: Weierstrass Institute
Year: 2013
Subjects: subject: coupled phase oscillators
subject: non-local coupling
subject: coherence-incoherence patterns
subject: chimera states
subject: bifurcation analysis
subject: pattern formation
subject: 34C15
subject: 35B36
subject: 5B32
subject: 35B42
subject: 35Q83
subject: 05.45.Xt
subject: 89.75.Kd

description: We consider a paradigmatic spatially extended model of non-locally coupled phase oscillators which are uniformly distributed within a one-dimensional interval and interact depending on the distance between their sites modulo periodic boundary conditions. This model can display peculiar spatio-temporal patterns consisting of alternating patches with synchronized (coherent) or irregular (incoherent) oscillator dynamics, hence the name coherence-incoherence pattern, or chimera state. For such patterns we formulate a general bifurcation analysis scheme based on a hierarchy of continuum limit equations. This gives us possibility to classify known coherence-incoherence patterns and to suggest directions for searching new ones.
Beam shaping mechanism in spatially modulated edge emitting broad area semiconductor amplifiers
Creators: name: Radziunas, Mindaugas
name: Botey, Muriel
name: Herrero, Ramon
name: Staliunas, Kestutis
Publisher: name: Weierstrass Institute
Year: 2013
Subjects: subject: broad area semiconductor amplifiers
subject: periodic modulation
subject: spatial modulation
subject: angular filtering
subject: beam shaping
subject: far field
subject: quality improvement
subject: traveling wave model
subject: 35Q60
subject: 35B27
subject: 37M05
subject: 78A60
subject: 78A45

description: We investigate beam shaping in broad area semiconductor amplifiers induced by a periodic modulation of the pump on a scale of several microns. The study is performed by solving numerically a (2+1)-dimensional model for the semiconductor amplifier. We show that, under realistic conditions, the anisotropic gain induced by the pump periodicity can show narrow angular profile of enhanced gain of less than one degree, providing an intrinsic filtering mechanism and eventually improving the spatial beam quality.
Bulk Photovoltaic Effects in Helimagnets
Creators: name: Zhang, Chunmei
name: Zhou, Jian
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The bulk photovoltaic (BPV) effect that converts light into electric current is highly sensitive to the system symmetry and its electronic Bloch wavefunction. To create a sizable net electric current, it is necessary to break the centrosymmetry P in its host material. While prior studies mainly focus on P-broken nonmagnetic (time reversal T-reserved) and collinear antiferromagnetic PT systems, here we adopt magnetic group theory to scrutinize how helical spin polarization breaks P that is otherwise kept in its crystalline geometry. Such spin helix widely exists in intrinsic multiferroics and magnon excitation in collinear magnets. We demonstrate that magnetic symmetries are determined by spin spiral configurations, helical propagation wavevectors, magnetic chirality, and spin winding angles at the home site, offering effective and versatile manipulation of BPV generation in helimagnets. This is illustrated by tight-binding model calculations. Furthermore, we apply our theory to monolayer NiI2, a realistic showcase for helimagnetic material. Our first-principles calculations show that it could host observable direction-dependent BPV current, which could serve as a photoelectric probe to track the subtle magnetic configurations and potential multiferroic nature. This work reveals the fundamental mechanism of the interplay between spin spiral order and nonlinear optics process.
Perturbation determinants for singular perturbations
Creators: name: Malamud, Mark
name: Neidhardt, Hagen
Publisher: name: Weierstrass Institute
Year: 2013
Subjects: subject: symmetric operators
subject: boundary triplets
subject: almost solvable extensions
subject: perturbation determinants
subject: second order elliptic operators
subject: 47B25
subject: 34B20
subject: 34B24

description: For proper extensions of a densely defined closed symmetric operator with trace class resolvent difference the perturbation determinant is studied in the framework of boundary triplet approach to extension theory.