cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ground state properties of a homogeneous 2D system of Bosons with dipolar interactions
Creators: name: Astrakharchik, G. E.
name: Boronat, J.
name: Casulleras, J.
name: Kurbakov, I. L.
name: Lozovik, Yu. E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The ground-state phase properties of a two-dimensional Bose system with dipole-dipole interactions is studied by means of quantum Monte Carlo techniques. Limitations of mean-field theory in a two-dimensional geometry are discussed. A quantum phase transition from gas to solid is found. Crystal is tested for existence of a supersolid in the vicinity of the phase transition. Existence of mesoscopic analogue of the off-diagonal long-range order is shown in the one-body density matrix in a finite-size crystal. Non-zero superfluid fraction is found in a finite-size crystal, the signal being dramatically increased in presence of vacancies.
description: Contribution to RPMBT14 conference. To be published in a volume of the Series on Advances in Quantum Many-Body by World Scientific
Matching the circular Wilson loop with dual open string solution at 1-loop in strong coupling
Creators: name: Kruczenski, M.
name: Tirziu, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compute the 1-loop correction to the effective action for the string solution in AdS_5 x S^5 dual to the circular Wilson loop. More generically, the method we use can be applied whenever the two dimensional spectral problem factorizes, to regularize and define the fluctuation determinants in terms of solutions of one-dimensional differential equations. A such it can be applied to non-homogeneous solutions both for open and closed strings and to various boundary conditions. In the case of the circular Wilson loop, we obtain, for the 1-loop partition function a result which up to a factor of two matches the expectation from the exact gauge theory computation. The discrepancy can be attributed to an overall constant in the string partition function coming from the normalization of zero modes, which we have not fixed.
description: 32 pages; v2: typos corrected, acknowledgments added; v3: minor corrections, references added
Efficient quantum processing of 3-manifold topological invariants
Creators: name: Garnerone, Silvano
name: Marzuoli, Annalisa
name: Rasetti, Mario
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A quantum algorithm for approximating efficiently 3--manifold topological invariants in the framework of SU(2) Chern-Simons-Witten (CSW) topological quantum field theory at finite values of the coupling constant k is provided. The model of computation adopted is the q-deformed spin network model viewed as a quantum recognizer in the sense of Wiesner and Crutchfield, where each basic unitary transition function can be efficiently processed by a standard quantum circuit. This achievement is an extension of the algorithm for approximating polynomial invariants of colored oriented links found in Refs 2,3. Thus all the significant quantities - partition functions and observables - of quantum CSW theory can be processed efficiently on a quantum computer, reflecting the intrinsic, field-theoretic solvability of such theory at finite k. The paper is supplemented by a critical overview of the basic conceptual tools underlying the construction of quantum invariants of links and 3-manifolds and connections with algorithmic questions that arise in geometry and quantum gravity models are discussed.
description: 39 pages, 22 figures, accepted for publication in Advances in Theoretical and Mathematical Physics
Application of catastrophe theory to voltage stability analysis of power systems
Creators: name: Hjartarson, Thorhallur
Publisher: name: University of British Columbia
Year: 2010

description: In this thesis catastrophe theory is applied to the voltage stability problem in power systems. A general model for predicting voltage stability from the system conditions is presented and then applied to both a simple 2-bus explanatory power system and to a larger more realistic power system. The model is based on the swallowtail catastrophe which with its three control variables is able to determine the voltage stability of the system. The model is derived directly from the systems equations. The voltage stability of the system at each specified system bus is determined by comparing the values of the swallowtail catastrophe control variables with those of the unique region of voltage stability. The control variables are calculated from the system operating conditions. If the control variables specify a point inside the stability region, the system is voltage stable; otherwise it is voltage unstable.
title: An exploration of the relationship between object and illness, with specific reference to multiple sclerosis, by means of a novel, Brodie, and five essays
Creators: name: Shirreffs, Gillian E.
Publisher: name: University of Glasgow
Year: 2021
Subjects: subject: creative writing, multiple sclerosis, illness narrative, fiction, Muriel Spark, hybrid form, chronic illness, medical objects, medical humanities.

description: This practice as research thesis comprises two elements. 1) The creative element is a novel, Brodie, which is narrated by an object, Brodie, who is a copy of The Prime of Miss Jean Brodie. The narrator’s experience mirrors something of what it is like to live with multiple sclerosis: the unwelcome intervention, confinement, and oddness that an MS relapse will inevitably bring. Hungry for information, Brodie is able to see, hear, smell, intuit and can communicate with other objects. Brodie cannot, however, move unaided. This existence may be marked by limitation and a lack of control, but it is full and vital thanks to Brodie’s keen interest in the lives and stories of others. Betrayal – a nod to the tendency towards treachery that a body with MS seems to possess – is a theme that, in common with The Prime of Miss Jean Brodie, threads through the novel. However, it is Brodie’s longing to return home to Violet (life before) that drives the narrative. 2) The creative / critical element comprises five essays: Object and Illness, An Introduction; Illness, A Narrative in Four Parts; and a collection entitled, Subject-Verb-Object. The essays in Subject-Verb-Object weave memoir into examinations of the history, development and use of three medical objects: the hypodermic needle, the MRI scanner, and the medical plinth.
A Twisted Custodial Symmetry in the Two-Higgs-Doublet Model
Creators: name: Gerard, J. -M.
name: Herquet, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the Standard Model for electroweak interactions, the Higgs sector is known to display a "custodial" symmetry protecting the mass relation m_{W^\pm}^2=m_{W_3}^2 from large corrections. When considering extensions of the scalar sector, this symmetry has to be introduced by hand in order to pass current electroweak precision tests in a natural way. In this Letter we implement a generalized custodial symmetry in the two-Higgs-doublet model. Assuming the invariance of the potential under CP transformations, we prove the existence of a new custodial scenario characterized by m_{H^\pm}^2=m_{H^0}^2 instead of m_{H^\pm}^2=m_{A^0}^2. Consequently the pseudoscalar A^0 may be much lighter than the charged H^\pm, giving rise to interesting phenomenology.
description: 4 pages, RevTeX4
Preparing Dicke states in a spin ensemble using phase estimation
Creators: name: Wang, Yang
name: Terhal, Barbara M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a Dicke state preparation scheme which uses global control of $N$ spin qubits: our scheme is based on the standard phase estimation algorithm, which estimates the eigenvalue of a unitary operator. The scheme prepares a Dicke state non-deterministically by collectively coupling the spins to an ancilla qubit via a $ZZ$-interaction, using $\ceil*{\log_2 N} + 1$ ancilla qubit measurements. The preparation of such Dicke states can be useful if the spins in the ensemble are used for magnetic sensing: we discuss a possible realization using an ensemble of electronic spins located at diamond Nitrogen-Vacancy (NV) centers coupled to a single superconducting flux qubit. We also analyze the effect of noise and limitations in our scheme.
Entangled mixed-state generation by twin-photon scattering
Creators: name: Puentes, G.
name: Voigt, D.
name: Aiello, A.
name: Woerdman, J. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report experimental results on mixed-state generation by multiple scattering of polarization-entangled photon pairs created from parametric down-conversion. By using a large variety of scattering optical systems we have experimentally obtained entangled mixed states that lie upon and below the Werner curve in the linear entropy-tangle plane. We have also introduced a simple phenomenological model built on the analogy between classical polarization optics and quantum maps. Theoretical predictions from such model are in full agreement with our experimental findings.
description: 6 pages, 4 figures
Phonon helicity induced by electronic Berry curvature in Dirac materials
Creators: name: Hu, Lun-Hui
name: Yu, Jiabin
name: Garate, Ion
name: Liu, Chao-Xing
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In two-dimensional insulators with time-reversal (TR) symmetry, a nonzero local Berry curvature of low-energy massive Dirac fermions can give rise to nontrivial spin and charge responses, even though the integral of the Berry curvature over all occupied states is zero. In this work, we present a new effect induced by the electronic Berry curvature. By studying electron-phonon interactions in BaMnSb$_2$, a prototype two-dimensional Dirac material possessing two TR-related massive Dirac cones, we find that the nonzero local Berry curvature of electrons can induce a phonon angular momentum. The direction of this phonon angular momentum is locked to the phonon propagation direction, and thus we refer it as "phonon helicity", in a way that is reminiscent of electron helicity in spin-orbit-coupled electronic systems. We discuss possible experimental probes of such phonon helicity.
description: 4+20 pages, 3+3 figures. All comments are welcome!
Electron-spectroscopic investigation of metal-insulator transition in Sr2Ru1-xTixO4 (x=0.0-0.6)
Creators: name: Ray, Sugata
name: Sarma, D. D.
name: Vijayaraghavan, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the nature and origin of the metal-insulator transition in Sr2Ru1-xTixO4 as a function of increasing Ti content (x). Employing detailed core, valence, and conduction band studies with x-ray and ultraviolet photoelectron spectroscopies along with Bremsstrahlung isochromat spectroscopy, it is shown that a hard gap opens up for Ti content greater than equal to 0.2, while compositions with x<0.2 exhibit finite intensity at the Fermi energy. This establishes that the metal-insulator transition in this homovalent substituted series of compounds is driven by Coulomb interaction leading to the formation of a Mott gap, in contrast to transitions driven by disorder effects or band flling.
description: Accepted for publication in Phys. Rev. B
NeuroEDDU protocols_Cell culture reagents
Creators: name: Durcan, Thomas Martin
name: Xiuqing Chen
name: Rocha, Cecilia
name: Meghna Mathur
name: Chanshuai Han
name: Nguyen-Vi Mohamed
Publisher: name: Zenodo
Year: 2019
Subjects: induced pluripotent stem cells
iPSCs
reagents
Cell culture
EDDU
MNI
McGill

description: Clickable pdf providing an overview of all the cell culture reagents used by the group for working with induced pluripotent stem cells and for generating different neuronal sub-types
Sub-ns spin-transfer switching: compared benefits of free layer biasing and pinned layer biasing
Creators: name: Devolder, T.
name: Chappert, C.
name: Ito, K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We analyze the statistical distribution of switching durations in spin-transfer switching induced by current steps, and discuss biasing strategies to enhance the reproducibility of switching durations. We use a macrospin approximation and model the effect of finite temperature as a Boltzmann distribution of initial magnetization states (adiabatic limit). We compare three model spin-valves: a spin-valve with a free layer whose easy axis is parallel to the pinned layer magnetization (standard geometry), a pinned layer with magnetization tilted with respect to the free layer easy axis (pinned layer biasing), and a free layer whose magnetization is pulled away from easy axis by a hard axis bias (free layer biasing). In the conventional geometry, the switching durations follow a broad regular distribution, with an extended long tail comprising very long switching events. For the two biasing strategies, the switching durations follow a multiply-stepped distribution, reflecting the precessional nature of the switching, and the statistical number of precession cycles needed for reversal. We derive analytical criteria to avoid switching events lasting much longer than the average switching duration, in order to achieve the highest reproducibilities. Depending on the current amplitude and the biasing strength, the width of the switching time distribution can be substantially reduced, the best reproducibility being achieved for free layer biasing at overdrive current of a few times unity.
description: submitted to Phys Rev. B
Methanol and water maser observations separate disc and outflow sources in IRAS 19410+2336
Creators: name: Darwish, M. S.
name: Edris, K. A.
name: Richards, A. M. S.
name: Etoka, S.
name: Saad, M. S.
name: Beheary, M. M.
name: Fuller, G. A
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We investigate the kinematics of high mass protostellar objects within the high mass star forming region IRAS 19410+2336. We performed high angular resolution observations of 6.7-GHz methanol and 22 GHz water masers using the MERLIN (Multi-Element Radio Linked Interferometer Network) and e-MERLIN interferometers. The 6.7-GHz methanol maser emission line was detected within the $\sim$ 16--27 km s$^{-1}$ velocity range with a peak flux density $\sim$50 Jy. The maser spots are spread over $\sim$1.3 arcsec on the sky, corresponding to $\sim$2800 au at a distance of 2.16 kpc. These are the first astrometric measurements at 6.7 GHz in IRAS 19410+2336. The 22-GHz water maser line was imaged in 2005 and 2019 (the latter with good astrometry). Its velocities range from 13 to $\sim$29 km s$^{-1}$. The peak flux density was found to be 18.7 Jy and 13.487 Jy in 2005, and 2019, respectively. The distribution of the water maser components is up to 165 mas, $\sim$350 au at 2.16 kpc. We find that the Eastern methanol masers most probably trace outflows from the region of millimetre source mm1. The water masers to the West lie in a disc (flared or interacting with outflow/infall) around another more evolved millimetre source (13-s). The maser distribution suggests that the disc lies at an angle of 60$^{\circ}$ or more to the plane of the sky and the observed line of sight velocities then suggest an enclosed mass between 44 M$_{\odot}$ and as little as 11 M$_{\odot}$ if the disc is edge-on. The Western methanol masers may be infalling.
Differential immediate early gene activity revealed by playback of male and female incomplete chick-a-dee calls
Creators: Scully, E.N., Montenegro, C., & Sturdy, C.B.
Publisher: name: University of Alberta Library
Year: 2020

	In both humans and animals, biological differences between males and females has long been a topic of research. In songbirds, sexual dimorphisms can be seen in many species’ plumage and heard in some species’ songs. However, not all songbirds have such overt phenotypic sexual differences, leading to the question: are all vocalizations dimorphic? One of the most used and versatile vocalizations of the black-capped chickadee (Poecile atricapillus) is their namesake chick-a-dee call, that is produced by both sexes. This call is composed of four note types: A, B, C (together chick-a), and D (dee). Previous research has found that A notes contain information regarding the sex of the caller. However, chickadees do not categorize full chick-a-dee calls, or altered chick-a calls, based on the sex of the caller. Here we presented both male and female chickadees with altered chick-a calls (dee portion removed) of both sexes and measured the number of ZENK labeled cells in auditory nuclei. We found that calls produced by males and females had more ZENK labeled cells than the control condition; however, there was no significant difference in ZENK labeled cells between male and female listeners.. Overall, our results suggest that black-capped chickadees do not perceive sexual differences in the production of chick-a calls.
Inverse Scattering Theory for One-Dimensional Schroedinger Operators with Steplike Periodic Potentials
Creators: name: de Monvel, Anne Boutet
name: Egorova, Iryna
name: Teschl, Gerald
Publisher: name: arXiv
Year: 2007
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 34L25, 81U40; 34B30, 34L40

description: We develop direct and inverse scattering theory for one-dimensional Schroedinger operators with steplike potentials which are asymptotically close to different finite-gap periodic potentials on different half-axes. We give a complete characterization of the scattering data, which allow unique solvability of the inverse scattering problem in the class of perturbations with finite second moment.
description: 34 pages
Temperature dependence of divacancy spin coherence in implanted silicon carbide
Creators: name: Lin, Wu-Xi
name: Yan, Fei-Fei
name: Li, Qiang
name: Wang, Jun-feng
name: Hao, Zhi-He
name: Zhou, Ji-Yang
name: Li, Hao
name: You, Li-Xing
name: Xu, Jin-Shi
name: Li, Chuan-Feng
name: Guo, Guang-Can
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Spin defects in silicon carbide (SiC) have attracted increasing interest due to their excellent optical and spin properties, which are useful in quantum information processing. In this paper, we systematically investigate the temperature dependence of the spin properties of divacancy defects in implanted 4\emph{H}-SiC. The zero-field splitting parameter $D$, the inhomogeneous dephasing time $T_2^{*}$, the coherence time $T_2$, and the depolarization time $T_1$ are extensively explored in a temperature range from 5 to 300 K. Two samples implanted with different nitrogen molecule ion fluences ($\rm {N_2}^{+}$, $1\times 10^{14}/\rm cm^{2}$ and $1\times 10^{13}/\rm cm^{2}$) are investigated, whose spin properties are shown to have similar temperature-dependent behaviors. Still, the sample implanted with a lower ion fluence has longer $T_{2}$ and $T_{1}$. We provide possible theoretical explanations for the observed temperature-dependent dynamics. Our work promotes the understanding of the temperature dependence of spin properties in solid-state systems, which can be helpful for constructing wide temperature-range thermometers based on the mature semiconductor material.
description: 7 pages, 5 figures, 46 references
Competition between Born solvation, dielectric exclusion, and Coulomb attraction in spherical nanopores
Creators: name: Hennequin, Théo
name: Manghi, Manoel
name: Palmeri, John
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The recent measurement of a very low dielectric constant, $ε$, of water confined in nanometric slit pores leads us to reconsider the physical basis of ion partitioning into nanopores. For confined ions in chemical equilibrium with a bulk of dielectric constant $ε_b>ε$, three physical mechanisms, at the origin of ion exclusion in nanopores, are expected to be modified due to this dielectric mismatch: dielectric exclusion at the water-pore interface (with membrane dielectric constant, $ε_m
description: Supplemental Material on demand
Non-Markovian open quantum system approach to the early universe: I. Damping of gravitational waves by matter
Creators: name: Zarei, Moslem
name: Bartolo, Nicola
name: Bertacca, Daniele
name: Ricciardone, Angelo
name: Matarrese, Sabino
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: By revising the application of the open quantum system approach to the early universe and extending it to the conditions beyond the Markovian approximation, we obtain a new non-Markovian quantum Boltzmann equation. Throughout the paper, we also develop an extension of the quantum Boltzmann equation to describe the processes that are irreversible at the macroscopic level. This new kinetic equation is, in principle, applicable to a wide variety of processes in the early universe. For instance, using this equation one can accurately study the microscopic influence of a cosmic environment on a system of cosmic background photons or stochastic gravitational waves. In this paper, we apply the non-Markovian quantum Boltzmann equation to study the damping of gravitational waves propagating in a medium consisting of decoupled ultra-relativistic neutrinos. For such a system, we study the time evolution of the intensity and the polarization of the gravitational waves. It is shown that, in contrast to intensity and linear polarization which are damped, the circular polarization (V-mode) of the gravitational wave (if present) is amplified by propagating through such a medium.
description: Final published version. 40 pages, 2 figures
Intermediate mass dileptons as pre-equilibrium probes in heavy ion collisions
Creators: name: Coquet, Maurice
name: Du, Xiaojian
name: Ollitrault, Jean-Yves
name: Schlichting, Soeren
name: Winn, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The production of dileptons with an invariant mass in the range 1 GeV < M < 5 GeV provides unique insight into the approach to thermal equilibrium in ultrarelativistic nucleus-nucleus collisions. In this mass range, they are produced through the annihilation of quark-antiquark pairs in the early stages of the collision. They are sensitive to the anisotropy of the quark momentum distribution, and also to the quark abundance, which is expected to be underpopulated relative to thermal equilibrium. We take into account both effects based on recent theoretical developments in QCD kinetic theory, and study how the dilepton mass spectrum depends on the shear viscosity to entropy ratio that controls the equilibration time. We evaluate the background from the Drell-Yan process and argue that future detector developments can suppress the additional background from semileptonic decays of heavy flavors.
description: 10 pages, 7 figures; computation of the effective area is defined more rigorously, figures are updated accordingly. Added paragraph on page 7, discussing the impact of inhomogeneities in transverse density profile. Added paragraph in the conclusion on page 9, on fitting the invariant mass spectrum with a power function
Didaktik der Rhetorik
Creators: name: Teuchert, Brigitte
Publisher: name: Universität Regensburg
Year: 2016
Subjects: subject: Mündliche Kommunikation, Rhetorik, Methodik, Didaktik der Rhetorik, Stimme, Sprecherziehung, Sprechwissenschaft, Mündlichkeit, Speech Communication, Führung
subject: 370 Erziehung, Schul- und Bildungswesen
subject: 380 Handel, Kommunikation, Verkehr

description: Mündliche Kommunikation und Rhetorik werden zunehmend wichtiger in Wirtschaft und Lehre. Der berufsbegleitende Weiterbildungsmaster der Universität Regensburg "Speech Communication and Rhetoric" vermittelt umfangreiche Kompetenzen, um eigene rhetorische Fähigkeiten auszubauen, insbesondere aber als DozentIn oder TrainerIn für mündliche Kommunikation tätig zu werden. Die vorliegende Zusammenstellung stellt wichtige Grundlagen zur Methodik und Didaktik der Mündlichen Kommunikation vor.
description: Rhetorische und mündliche Kompetenzen sind gefragt in Wirtschaft und Lehre. Trainigs und Seminare zur mündlichen Kommunikation müssen professionell aufgebaut sein. Der Reader zeigt Methoden und didaktiksche Vorgehensweisen.
Resonance Fluorescence in Transport through Quantum Dots: Noise Properties
Creators: name: Sánchez, Rafael
name: Platero, Gloria
name: Brandes, Tobias
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study a two-level quantum dot embedded in a phonon bath and irradiated by a time-dependent ac field and develope a method that allows us to extract simultaneously the full counting statistics of the electronic tunneling and relaxation (by phononic emission) events as well as their correlation. We find that the quantum noise of both the transmitted electrons and the emitted phonons can be controlled by the manipulation of external parameters such as the driving field intensity or the bias voltage.
description: 5 pages, 5 figures
Scattering cross-section in gravitating cosmic string spacetimes
Creators: name: Silva, Marcos
name: Mohammadi, Azadeh
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a modification of the partial wave approach to deal with the relativistic quantum scattering of bosonic and fermionic particles in a class of models concerning gravitating cosmic string spacetimes. These spacetimes are characterized by the Minkowski line element at the center of the vortex, non-vanishing curvature at a finite distance from the center but with a conical structure far from the core. We find the correction in the partial wave expansion and the phase shift. Consequently, we show the explicit form of the scattering amplitude and the correction to the differential cross-section for a massive scalar field. We also implement our formalism in a toy model mimicking this class of gravitating cosmic string spacetime. Moreover, we discuss the procedure to apply this formalism to a massive Dirac field.
title: Computer aided tools for architectural and urban automatic generation
Creators: name: Lunazzi, Renato Saleria
Publisher: name: As fórmulas na arquitectura
Year: 2020

description: As fórmulas na arquitectura / 4.º Seminário Internacional de Arquitectura e Matemática ; coordenação de Fátima Silva, Elsa Negas, Rui Seco. - Lisboa : Universidade Lusíada, 2020. - P. 31-44.
Evidence of the Coulomb force effects in the cross sections of the deuteron-proton breakup at 130 MeV
Creators: name: Kistryn, St.
name: Stephan, E.
name: Klos, B.
name: Biegun, A.
name: Bodek, K.
name: Ciepal, I.
name: Deltuva, A.
name: Fonseca, A.
name: Kalantar-Nayestanaki, N.
name: Kis, M.
name: Kozela, A.
name: Mahjour-Shafiei, M.
name: Micherdzinska, A.
name: Sauer, P. U.
name: Sworst, R.
name: Zejma, J.
name: Zipper, W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: High precision cross-section data of the deuteron-proton breakup reaction at 130 MeV deuteron energy are compared with the theoretical predictions obtained with a coupled-channel extension of the CD Bonn potential with virtual Delta-isobar excitation, without and with inclusion of the long-range Coulomb force. The Coulomb effect is studied on the basis of the cross-section data set, extended in this work to about 1500 data points by including breakup geometries characterized by small polar angles of the two protons. The experimental data clearly prefer predictions obtained with the Coulomb interaction included. The strongest effects are observed in regions in which the relative energy of the two protons is the smallest.
description: 9 pages, 3 figures, submitted to Physics Letters B
Nonvanishing Finite Scalar Mass in Flux Compactification
Creators: name: Hirose, Takuya
name: Maru, Nobuhito
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study possibilities to realize a nonvanishing finite Wilson line (WL) scalar mass in flux compactification. Generalizing loop integrals in the quantum correction to WL mass at one-loop, we derive the conditions for the loop integrals and mode sums in one-loop corrections to WL scalar mass to be finite. We further guess and classify the four-point and three-point interaction terms satisfying these conditions. As an illustration, the nonvanishing finite WL scalar mass is explicitly shown in a six dimensional scalar QED by diagrammatic computation and effective potential analysis. This is the first example of finite WL scalar mass in flux compactification.
description: 21 pages, 1 figure, final version to appear in JHEP
L'impact des pratiques humaines du contrôle de gestion sur la performance commerciale Cas du secteur automobile
Creators: name: BENDAHHOU Fedoua
name: GHARBAOUI Madiha
name: DOUARI Aziz
Publisher: name: Zenodo
Year: 2024

description: Le secteur automobile marocain est en pleine expansion et occupe une place stratégique dans l’économie nationale. Avec l’implantation de grandes entreprises internationales telles que Renault et PSA Peugeot-Citroën, le Maroc s’affirme comme un hub industriel compétitif et attractif pour le marché automobile mondial. Cet article examine les pratiques liées à la dimension humaine du contrôle de gestion et leur impact sur la performance commerciale dans ce secteur. En se basant sur des recherches académiques, des études de cas locales et des témoignages d’experts, l’article montre comment les facteurs humains peuvent influencer et améliorer l’efficacité des systèmes de contrôle de gestion dans les entreprises automobiles marocaines.
Transfer Learning for Neural Networks-based Equalizers in Coherent Optical Systems
Creators: name: Freire, Pedro J.
name: Abode, Daniel
name: Prilepsky, Jaroslaw E.
name: Costa, Nelson
name: Spinnler, Bernhard
name: Napoli, Antonio
name: Turitsyn, Sergei K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this work, we address the question of the adaptability of artificial neural networks (NNs) used for impairments mitigation in optical transmission systems. We demonstrate that by using well-developed techniques based on the concept of transfer learning, we can efficaciously retrain NN-based equalizers to adapt to the changes in the transmission system, using just a fraction (down to 1%) of the initial training data or epochs. We evaluate the capability of transfer learning to adapt the NN to changes in the launch power, modulation format, symbol rate, or even fiber plants (different fiber types and lengths). The numerical examples utilize the recently introduced NN equalizer consisting of a convolutional layer coupled with bi-directional long-short term memory (biLSTM) recurrent NN element. Our analysis focuses on long-haul coherent optical transmission systems for two types of fibers: the standard single-mode fiber (SSMF) and the TrueWave Classic (TWC) fiber. We underline the specific peculiarities that occur when transferring the learning in coherent optical communication systems and draw the limits for the transfer learning efficiency. Our results demonstrate the effectiveness of transfer learning for the fast adaptation of NN architectures to different transmission regimes and scenarios, paving the way for engineering flexible and universal solutions for nonlinearity mitigation.
description: in Journal of Lightwave Technology, doi: 10.1109/JLT.2021.3108006
Supplementary document for High-fidelity Color Image Restoration from a Disturbed Graded-index Imaging System by Deep Neural Networks - 6392732.pdf
Creators: name: Hu, Xuanyu
name: Duan, ZiPeng
name: Yang, Yang
name: Tan, Yehong
name: Zhou, Ruiqi
name: Xiao, Jion
name: Zeng, Jinwei
name: Wang, Jian
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Uncategorized

description: Principle Description
Flux Continuity and Probability Conservation in Complexified Bohmian Mechanics
Creators: name: Poirier, Bill
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Recent years have seen increased interest in complexified Bohmian mechanical trajectory calculations for quantum systems, both as a pedagogical and computational tool. In the latter context, it is essential that trajectories satisfy probability conservation, to ensure they are always guided to where they are most needed. In this paper, probability conservation for complexified Bohmian trajectories is considered. The analysis relies on time-reversal symmetry considerations, leading to a generalized expression for the conjugation of wavefunctions of complexified variables. This in turn enables meaningful discussion of complexified flux continuity, which turns out not to be satisfied in general, though a related property is found to be true. The main conclusion, though, is that even under a weak interpretation, probability is not conserved along complex Bohmian trajectories.
description: 10 pages, 2 figures
Macroscopically nonlocal quantum correlations
Creators: name: Gallego, Miguel
name: Dakić, Borivoje
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It is usually believed that coarse-graining of quantum correlations leads to classical correlations in the macroscopic limit. Such a principle, known as macroscopic locality, has been proved for correlations arising from independent and identically distributed (IID) entangled pairs. In this letter we consider the generic (non-IID) scenario. We find that the Hilbert space structure of quantum theory can be preserved in the macroscopic limit. This leads directly to a Bell violation for coarse-grained collective measurements, thus breaking the principle of macroscopic locality.
description: 12 pages, 1 figure
Robust Weak Measurements on Finite Samples
Creators: name: Tollaksen, Jeff
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A new weak measurement procedure is introduced for finite samples which yields accurate weak values that are outside the range of eigenvalues and which do not require an exponentially rare ensemble. This procedure provides a unique advantage in the amplification of small non-random signals by minimizing uncertainties in determining the weak value and by minimizing sample size. This procedure can also extend the strength of the coupling between the system and measuring device to a new regime.
A methodology for the optimization of heat sterilization for rectangular food packages
Creators: name: Greaves, Karen F.
Publisher: name: University of British Columbia
Year: 2010

description: A new method for designing optimum package size and processing conditions for re-tortable flexible or microwaveable packages has been specified. The method employed the random centroid optimization technique. The method also included a computer simulation model, used to calculated process lethality and nutrient degradation, and an objective function used to calculate total process cost from the above values as well as from the processing parameters. The objective function was original in that it was economicaly based, rather than concentrating solely on achieving processes with high product quality. Typical processing costs such as the cost of energy or materials were included, as well as more qualitative costs such as those associated with decreases in product quality. Most of these costs were inferred from conventional can processing costs, as information regarding processing costs for flexible or microwaveable retortable packages was often unavailable. For the simulation model, a recently developed one dimensional finite difference technique of high accuracy (the exponential finite difference method) was extended to three dimensions and used to solve the partial differential heat flow equation. The simulation model also comprised an original algorithm to model headspace and a new numerical integration technique to calculate lethality and nutrient degradation from the time temperature profile. The headspace model calculated headspace volume as a function of retort temperature and pressure and then used steady state heat transfer theory to model heat flow across the package headspace. The numerical integration technique fitted an exponential curve to the time temperature profile and then integrated this curve analytically. The accuracies of the exponential finite difference method with and without headspace included and of the numerical integration technique were tested by comparison with both analytical solutions and other well established numerical methods. In addition, the uncertainty associated with the assumption of uniform paramaters was evaluated using a Monte Carlo technique. After the validity of the simulation model was established, it was used in conjunction with the objective function and the random centroid optimization method to search for a global cost minimum. One trial optimization using a simple objective function was made, followed by three optimization runs using the more complex objective function desinged to calculate process cost. Each optimization used a different set of decision variables, which varied in number from three to five. The results were evaluated as to whether a minimum was found, and if so, whether it constituted a global minimum.
Restoration of Dynamically Broken Chiral and Color Symmetries for an Accelerated Observer
Creators: name: Ebert, D.
name: Zhukovsky, V. Ch.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the behavior of quark and diquark condensates at finite Unruh temperature as seen by an accelerated observer. The gap equations for these condensates have been obtained with consideration of a finite chemical potential. Critical values of the acceleration for the restoration of chiral and color symmetries have been estimated.
description: 10 pages
Many-Body Quantum States with Exact Conservation of Non-Abelian and Lattice Symmetries through Variational Monte Carlo
Creators: name: Vieijra, Tom
name: Nys, Jannes
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Optimization of quantum states using the variational principle has recently seen an upsurge due to developments of increasingly expressive wave functions. In order to improve on the accuracy of the ansätze, it is a time-honored strategy to impose the systems' symmetries. We present an ansatz where global non-abelian symmetries are inherently embedded in its structure. We extend the model to incorporate lattice symmetries as well. We consider the prototypical example of the frustrated two-dimensional $J_1$-$J_2$ model on a square lattice, for which eigenstates have been hard to model variationally. Our novel approach guarantees that the obtained ground state will have total spin zero. Benchmarks on the 2D $J_1$-$J_2$ model demonstrate its state-of-the-art performance in representing the ground state. Furthermore, our methodology permits to find the wave functions of excited states with definite quantum numbers associated to the considered symmetries (including the non-abelian ones), without modifying the architecture of the network.
Do Bloch waves interfere with one another ?
Creators: name: Vyas, Vivek M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Here we show that two Bloch states, which are energy eigenstates of a quantum periodic potential problem, with different wavevectors can not be linearly superposed to display quantum interference of any kind that captures the relative phase between them. This is due to the existence of a superselection rule in these systems, whose origin lies in the discrete translation symmetry. A topological reason leading to such a superselection is found. A temporal analogue of this superselection rule in periodically driven quantum systems is also uncovered, which forbids the coherent superposition of any two quasi-periodic Floquet states with different quasienergies.
description: 7 pages, no figures
Supplementary Table 2. from Shared evolutionary footprints suggest mitochondrial oxidative damage underlies multiple complex I losses in fungi
Creators: name: Schikora-Tamarit, Miquel Àngel
name: Marcet-Houben, Marina
name: Nosek, Jozef
name: Gabaldón, Toni
Publisher: name: The Royal Society
Year: 2021

description: Information about the full genome assemblies generated in this work.
Fast Speech in Unit Selection Speech Synthesis
Creators: name: Moers-Prinz, Donata
Publisher: name: Universität Bielefeld
Year: 2020
Subjects: subject: 410

description: Speech synthesis is part of the everyday life of many people with severe visual disabilities. For those who are reliant on assistive speech technology the possibility to choose a fast speaking rate is reported to be essential. But also expressive speech synthesis and other spoken language interfaces may require an integration of fast speech. Architectures like formant or diphone synthesis are able to produce synthetic speech at fast speech rates, but the generated speech does not sound very natural. Unit selection synthesis systems, however, are capable of delivering more natural output. Nevertheless, fast speech has not been adequately implemented into such systems to date. Thus, the goal of the work presented here was to determine an optimal strategy for modeling fast speech in unit selection speech synthesis to provide potential users with a more natural sounding alternative for fast speech output.
Gap Equations and Electroweak Symmetry Breaking
Creators: name: Cynolter, G.
name: Lendvai, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Recently a new dynamical symmetry breaking model of electroweak interactions was proposed based on interacting fermions. Two fermions of different SU(2) representations form a symmetry breaking condensate and generate the lepton and quark masses. The weak gauge bosons get their usual standard model masses from a gauge invariant Lagrangian of a composite doublet scalar field. The new fermion fields become massive by condensation. In this note the gap equations are given in the linearized (mean field) approximation and the conditions for symmetry breaking and mass generation are presented. Perturbative unitarity constrains the self-couplings and the masses of the new fermions, a raw spectrum is given.
description: 10 pages, 4 figures
Longitudinal photocurrent spectroscopy of a single GaAs/AlGaAs v-groove quantum wire
Creators: name: Cade, N. I.
name: Hadjipanayi, M.
name: Roshan, R.
name: Maciel, A. C.
name: Ryan, J. F.
name: Macherey, F.
name: Schaepers, Th.
name: Lueth, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Modulation-doped GaAs v-groove quantum wires (QWRs) have been fabricated with novel electrical contacts made to two-dimensional electron-gas (2DEG) reservoirs. Here, we present longitudinal photocurrent (photoconductivity/PC) spectroscopy measurements of a single QWR. We clearly observe conductance in the ground-state one-dimensional subbands; in addition, a highly temperature-dependent response is seen from other structures within the v-groove. The latter phenomenon is attributed to the effects of structural topography and localization on carrier relaxation. The results of power-dependent PC measurements suggest that the QWR behaves as a series of weakly interacting localized states, at low temperatures.
Resonant Electro-optic Imaging for Microscopy at Nanosecond Resolution
Creators: name: Bowman, Adam J.
name: Kasevich, Mark A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We demonstrate an electro-optic wide-field method to enable fluorescence lifetime microscopy (FLIM) with high throughput and single-molecule sensitivity. Resonantly driven Pockels cells are used to efficiently gate images at 39 MHz, allowing fluorescence lifetime to be captured on standard camera sensors. Lifetime imaging of single molecules is enabled in wide-field with exposure times of less than 100 milliseconds. This capability allows combination of wide-field FLIM with single-molecule super-resolution localization microscopy. Fast single-molecule dynamics such as FRET and molecular binding events are captured from wide-field images without prior spatial knowledge. A lifetime sensitivity of 1.9 times the photon shot-noise limit is achieved, and high throughput is shown by acquiring wide-field FLIM images with millisecond exposure and $>10^8$ photons per frame. Resonant electro-optic FLIM allows lifetime contrast in any wide-field microscopy method.
description: 23 pages, 13 figures
Supplementary Table 6. from Shared evolutionary footprints suggest mitochondrial oxidative damage underlies multiple complex I losses in fungi
Creators: name: Schikora-Tamarit, Miquel Àngel
name: Marcet-Houben, Marina
name: Nosek, Jozef
name: Gabaldón, Toni
Publisher: name: The Royal Society
Year: 2021

description: Annotations of the genes mapping to superoxide dismutase, peroxidase and glutathione and are under duplication, positive selection and/or mitochondrial retargeting. Depicted are the KEGG ortholog names (KO), the type of mapping (t), which can be high similarity (+) or low similarity (?), the set of genes (set, which can be positive selection (+Sel), duplication (Dup) or mitochondrial retargeting (MitoR)) and the subcellular locations with predicted probability above 0.1. In purple we outline genes that have such mitochondrial locations.
Tachyonic open inflationary universes
Creators: name: Balart, Leonardo
name: del Campo, Sergio
name: Herrera, Ramon
name: Labrana, Pedro
name: Saavedra, Joel
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study one-field open inflationary models in a universe dominated by tachyon matter. In these scenarios, we determine and characterize the existence of the Coleman-De Lucia (CDL) instanton. Also, we study the Lorentzian regime, that is, the period of inflation after tunnelling has occurred.
description: 13 pages, 7 figures. Accepted by Physics Letters B