cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Controlling the emission of ultra-thin semiconductors by photonic nanostructures
Creators: name: Yan, Jingshi
Publisher: name: The Australian National University
Year: 2022

description: Since the discovery of graphene in 2004, ultra-thin materials have attracted a lot of research interests in the last decade. However, the zero-bandgap of graphene limits its application, so more emerging ultra-thin semiconductors with visible direct bandgap such as monolayer transition metal dichalcogenides (TMDC) and Lead iodide (PbI2) nanosheets have been widely studied. Their remarkable optical properties including the visible direct bandgap, robust valley polarisation and strong tunability make them ideal for optoelectronic devices. The unique valley polarisation can also be considered as a new degree of freedom, which enables new opportunities in the field of valleytronics. Manipulating the valley polarisation by the optical method is the key to realise valleytronic devices. However, the atomic thickness limits the light-matter interaction length and efficiency. An important solution to enhance the light-matter interactions, including photoluminescence (PL) and nonlinear emissions from such ultra-thin semiconductors is to couple them to photonic nanostructures. In this thesis, I will show the emission manipulation of ultra-thin semiconductors by coupling them with different photonic nanostructures including dielectric grating waveguide, plasmonic nanoantennas and metasurface. Our works demonstrate enhancement and control of the emissions and show great potential for the future optoelectronic applications. In Chapter 1, I will first give an introduction on the basic concepts of semiconductors, emissions and photonic structures, and review on the related works as well. In Chapter 2, we will present the enhanced and polarisation-selective directional PL emission from a monolayer WSe2 coupled to a silicon grating waveguide nanostructure. In Chapter 3, we will present how to spatially separate the PL originating from the different valleys of the monolayer WSe2 by plasmonic nanoantennas. Besides PL, in Chapter 4 I will demonstrate the nonlinear microscopy of two novel ultra-thin semiconductors including PbI2 nanosheets and InP nanomembranes with InAsP quantum wells. In the PbI2 nanosheets subsection, the nonlinear emissions can be controlled by thickness, pump polarisation and wavelength, and substrate. By using the nonlinear harmonic emission, we can also precisely determine their thickness and crystalline orientation. In the InP nanomembrane subsection, I will demonstrate the SHG enhancement based on the resonance mode of InAsP QW. Instead of coupling monolayer with photonic nanostructures, we can fabricate the ultra-thin semiconductors themselves to nanostructures. In Chapter 5, we will show the tunable nonlinear emissions from TMDC metasurfaces by using nonlinear microscopy techniques. Finally, I will summarise my work and give an outlook on the future direction of coupling ultra-thin semiconductors with photonic nanostructures.
Systematic study of breakup effects on complete fusion at energies above the Coulomb barrier
Creators: name: Wang, Bing
name: Zhao, Wei-Juan
name: Gomes, P. R. S.
name: Zhao, En-Guang
name: Zhou, Shan-Gui
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: A large number of complete fusion excitation functions of reactions including the breakup channel were measured in recent decades, especially in the last few years. It allows us to investigate the systematic behavior of the breakup effects on the complete fusion cross sections. To this end, we perform a systematic study of the breakup effects on the complete fusion cross sections at energies above the Coulomb barrier. The reduced fusion functions F(x) are compared with the universal fusion functions which are used as a uniform standard reference. The complete fusion cross sections at energies above the Coulomb barrier are suppressed by the breakup of projectiles. This suppression effect for reactions induced by the same projectile is independent of the target and mainly determined by the lowest energy breakup channel of the projectile. There holds a good exponential relation between the suppression factor and the energy corresponding to the lowest breakup threshold.
description: 10 pages, 9 figures; Fig. 9 and related discussions modified
Spectroscopy and laser cooling on the $^{1}S_{0}-\,^{3}P_{1}$ line in Yb via an injection-locked diode laser at 1111.6nm
Creators: name: Kostylev, Nikita
name: Locke, Clayton R.
name: Tobar, Michael E.
name: McFerran, John J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We generate 555.8nm light with sub-MHz linewidth through the use of laser injection-locking of a semiconductor diode at 1111.6nm, followed by frequency doubling in a resonant cavity. The integrity of the injection lock is investigated by studying an offset-beat signal between slave and master lasers, by performing spectroscopy on the $(6s)^{2}$ $^{1}S_{0}-\,(6s6p)$ $^{3}P_{1}$ transition in magneto-optically trapped ytterbium, and by demonstrating additional laser cooling of $^{171}$Yb with the 555.8nm light. For the $^{1}S_{0}-$ $^{3}P_{1}$ spectroscopy, we confirm the linear dependence between ground state linewidth and the intensity of an off-resonant laser, namely, that used to cool Yb atoms in a $^{1}S_{0}-$ $^{1}P_{1}$ magneto-optical trap. Our results demonstrate the suitability of injection locked 1100-1130nm laser diodes as a source for sub-MHz linewidth radiation in the yellow-green spectrum.
description: 12 pages, 6 figures
High-order Numerical Methods for Riesz Space Fractional Turbulent Diffusion Equation
Creators: name: Ding, Hengfei
name: Li, Changpin
Publisher: name: arXiv
Year: 2014
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: Numerical methods for fractional calculus attract increasing interests due to its wide applications in various fields such as physics, mechanics, etc. In this paper, we focus on constructing high-order algorithms for Riesz derivatives, where the convergence orders cover from the second order to the sixth order. Then we apply the established schemes to the Riesz space fractional turbulent diffusion equation. Numerical experiments are displayed which support the theoretical analysis.
Electron Glass in a three-dimensional system
Creators: name: Ovadyahu, Z.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report on non-equilibrium transport features observed in experiments using three-dimensional amorphous indium-oxide films. It is demonstrated that all the features that characterize intrinsic electron-glasses which heretofore were seen in two-dimensional samples are also observed in field-effect measurements of systems that exhibit three-dimensional variable-range-hopping. In particular, a memory-dip is observed in samples configured with gate. The memory-dip width and magnitude support models that associate the phenomenon with the Coulomb-gap. The memory-dip and the glassy effects disappear once the quenched disorder in the system is reduced and the system becomes diffusive. This happens when the Ioffe-Regel dimensional parameter k_{F}l exceeds 0.3 which is the critical value for the metal-to-insulator transition in all versions of the amorphous indium-oxides [Phys. Rev. B 86, 165101 (2012)]. This confirms that being in the Anderson localized phase is a pre-requisite for observing the memory-dip and the associated glassy effects. The results of the gating experiments suggest that the out-of equilibrium effect caused by inserted charge extend over spatial scales considerably larger than the screening length.
description: 9 pages 12 figures printed version
Applying Machine Learning for Duplicate Detection, Throttling and Prioritization of Equipment Commissioning Audits at Fulfillment Network
Creators: name: Halawa, Farouq
name: Abdul, Majid
name: Mohammed, Raashid
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: VQ (Vendor Qualification) and IOQ (Installation and Operation Qualification) audits are implemented in warehouses to ensure all equipment being turned over in the fulfillment network meets the quality standards. Audit checks are likely to be skipped if there are many checks to be performed in a short time. In addition, exploratory data analysis reveals several instances of similar checks being performed on the same assets and thus, duplicating the effort. In this work, Natural Language Processing and Machine Learning are applied to trim a large checklist dataset for a network of warehouses by identifying similarities and duplicates, and predict the non-critical ones with a high passing rate. The study proposes ML classifiers to identify checks which have a high passing probability of IOQ and VQ and assign priorities to checks to be prioritized when the time is not available to perform all checks. This research proposes using NLP-based BlazingText classifier to throttle the checklists with a high passing rate, which can reduce 10%-37% of the checks and achieve significant cost reduction. The applied algorithm over performs Random Forest and Neural Network classifiers and achieves an area under the curve of 90%. Because of imbalanced data, down-sampling and upweighting have shown a positive impact on the models' accuracy using F1 score, which improve from 8% to 75%. In addition, the proposed duplicate detection process identifies 17% possible redundant checks to be trimmed.
Characterization of spiraling patterns in spatial rock-paper-scissors games
Creators: name: Szczesny, Bartosz
name: Mobilia, Mauro
name: Rucklidge, Alastair M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: The spatio-temporal arrangement of interacting populations often influences the maintenance of species diversity and is a subject of intense research. Here, we study the spatio-temporal patterns arising from the cyclic competition between three species in two dimensions. Inspired by recent experiments, we consider a generic metapopulation model comprising "rock-paper-scissors" interactions via dominance removal and replacement, reproduction, mutations, pair-exchange and hopping of individuals. By combining analytical and numerical methods, we obtain the model's phase diagram near its Hopf bifurcation and quantitatively characterize the properties of the spiraling patterns arising in each phase. The phases characterizing the cyclic competition away far from the Hopf bifurcation (at low mutation rate) are also investigated. Our analytical approach relies on the careful analysis of the properties of the complex Ginzburg-Landau equation derived through a controlled (perturbative) multiscale expansion around the model's Hopf bifurcation. Our results allows us to clarify when spatial "rock-paper-scissors" competition leads to stable spiral waves and under which circumstances they are influenced by nonlinear mobility.
description: 16 two-column pages, 16 figures
Continuous Sign Language Recognition Using LSTM and Media Pipe Holistic
Creators: name: Madhura Mirikar
name: Komal Singh
name: Prof. Dr. Sampada Dhole
Publisher: name: Zenodo
Year: 2023

description: Speech impairment is a communication disorder that impacts an individual's ability to speak
fluently, correctly, or with clear resonance or tone. This paper presents a robust system to aid in
communicating with those suffering from speech impairment. Advancements in technology have led to the
development of innovative approaches for gesture recognition. The main purpose of this paper is to
introduce an improved method for Sign Language Recognition (SLR) using Mediapipe and Long Short-
Term Memory (LSTM), an artificial neural network. The proposed system performs real-time gesture
recognition on 5 signs from the American Sign Language (ASL) and gives precise, accurate, and efficient
results with an average accuracy of up to 99%
description: IJSRED - International Journal of Scientific Research and Engineering Development
Vorwort
Creators: name: Fiorentino, Francesco
name: Massalongo, Milena
Publisher: name: Trier University
Year: 2022

description: Begriffe sind keine Abbildungen von adäquat zu beschreibenden Gegenständen, sondern Werkzeuge, mit denen wir „die Wirklichkeit deuten“2 und deren konkreter Wert sich nach ihrer hermeneutischen Nützlichkeit bemisst. Die in diesem Heft gesammelten Texte gehen auf ein internationales Symposium zum Thema „Theaterbegriffe“ zurück, das im Dezember 2019 an der Università Roma Tre in Rom stattfand und dessen Ziel es war, neue oder neu erfasste Begriffe zur Beschreibung und zum Verständnis der theatralen Praktiken innerhalb und außerhalb der Institution Theater zu diskutieren.
Gravitational Aharonov-Bohm effect due to noncommutative BTZ black hole
Creators: name: Anacleto, M. A.
name: Brito, F. A.
name: Passos, E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper we consider the scattering of massless planar scalar waves by a noncommutative BTZ black hole. We compute the differential cross section via the partial wave approach, and we mainly show that the scattering of planar waves leads to a modified Aharonov-Bohm effect due to spacetime noncommutativity
description: 6 pages, latex, no figures. To appear in PLB. arXiv admin note: substantial text overlap with arXiv:1210.7739
Laboratory Demonstration of Optimal Identification and Control of Tip-Tilt Systems
Creators: name: Sengupta, Aditya R.
name: Gerard, Benjamin L.
name: Dillon, Daren
name: van Kooten, Maaike
name: Gavel, Donald
name: Jensen-Clem, Rebecca
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present the results of testing optimal linear-quadratic-Gaussian (LQG) control for tip and tilt Zernike wavefront modes on the SEAL (Santa cruz Extreme AO Lab) testbed. The controller employs a physics model conditioned by the expected tip/tilt power spectrum and vibration peaks. The model builds on similar implementations, such as that of the Gemini Planet Imager, by considering the effects of loop delays and the response of the control hardware. Tests are being performed on SEAL using the Fast Atmospheric Self-coherent camera Technique (FAST), and being executed using a custom Python library to align optics, generate interaction matrices, and perform real-time control by combining controllers with simulated disturbance signals to be corrected. We have carried out open-loop data collection, characterizing the natural bench dynamics, and have shown a reduction in RMS wavefront error due to integrator control and LQG control.
description: submitted to SPIE Astronomical Telescopes and Instrumentation 2022, paper number 12185-311
Paraxial ray optics cloaking
Creators: name: Choi, Joseph S.
name: Howell, John C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Despite much interest and progress in optical spatial cloaking, a three-dimensional (3D), transmitting, continuously multidirectional cloak in the visible regime has not yet been demonstrated. Here we experimentally demonstrate such a cloak using ray optics, albeit with some edge effects. Our device requires no new materials, uses isotropic off-the-shelf optics, scales easily to cloak arbitrarily large objects, and is as broadband as the choice of optical material, all of which have been challenges for current cloaking schemes. In addition, we provide a concise formalism that quantifies and produces perfect optical cloaks in the small-angle (`paraxial') limit.
Interplay between snake and quantum edge states in a graphene Hall bar with a pn-junction
Creators: name: Milovanovic, S. P.
name: Masir, M. Ramezani
name: Peeters, F. M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The magneto- and Hall resistance of a locally gated cross shaped graphene Hall bar is calculated. The edge of the top gate is placed diagonally across the center of the Hall cross. Four-probe resistance is calculated using the Landauer-Büttiker formalism, while the transmission coefficients are obtained using the non-equilibrium Green's function approach. The interplay between transport due to edge channels and snake states is investigated. When two edge channels are occupied we predict oscillations in the Hall and the bend resistance as function of the magnetic field which are a consequence of quantum interference between the occupied snake states.
A stronger null hypothesis for crossing dependencies
Creators: name: Ferrer-i-Cancho, Ramon
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computation and Language (cs.CL)
subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: The syntactic structure of a sentence can be modeled as a tree where vertices are words and edges indicate syntactic dependencies between words. It is well-known that those edges normally do not cross when drawn over the sentence. Here a new null hypothesis for the number of edge crossings of a sentence is presented. That null hypothesis takes into account the length of the pair of edges that may cross and predicts the relative number of crossings in random trees with a small error, suggesting that a ban of crossings or a principle of minimization of crossings are not needed in general to explain the origins of non-crossing dependencies. Our work paves the way for more powerful null hypotheses to investigate the origins of non-crossing dependencies in nature.
description: typos corrected and English improved
Influence of Silicon Carbide (Sic) on Optical Properties of Polyacrylamide (PAAm)
Creators: name: Dalal Hassan Abdelkadhim
Publisher: name: Zenodo
Year: 2023

description: In this work, nanocomposite films based on polyacrylamide (PAAm)and SiCwith differentcontentsare(2,
4 and 6) wt.% were prepared by solution casting technique. The prepared samples were characterized by
UV–Vis analytical techniques. The absorbance increase as the additives of SiC NPs increases while
transmittance and both allowed and forbidden energy gap decreased as the additives of SiC NPs
increased. The coefficients of absorption and extinction, index of refractive, real and imaginary dielectric
constants and optical conductivity increasedas the additives of SiC NPs increased.
Keywords: PAAm, SiC NPs, nanocomposite and optical properties.
Fluctuation dynamo at finite correlation times and the Kazantsev spectrum
Creators: name: Bhat, Pallavi
name: Subramanian, Kandaswamy
Publisher: name: arXiv
Year: 2014
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Fluctuation dynamos are generic to astrophysical systems. The only analytical model of the fluctuation dynamo is Kazantsev model which assumes a delta-correlated in time velocity field. We derive a generalized model of fluctuation dynamo with finite correlation time, $τ$, using renovating flows. For $τ\to 0$, we recover the standard Kazantsev equation for the evolution of longitudinal magnetic correlation, $M_L$. To the next order in $τ$, the generalized equation involves third and fourth spatial derivatives of $M_L$. It can be recast using the Landau-Lifschitz approach, to one with at most second derivatives of $M_L$. Remarkably, we then find that the magnetic power spectrum, remains the Kazantsev spectrum of $M(k) \propto k^{3/2}$, in the large $k$ limit, independent of $τ$.
description: 5 pages, Published in ApJL
Der moderne Zuschauer: Genealogie und Kritik
Creators: name: Fiorentino, Francesco
Publisher: name: Trier University
Year: 2022
Subjects: Spectator
Estrangement
Emancipation
Michel Foucault

description: Being a spectator in the theater has not always meant watching a performance while sitting quietly in the dark. There was a time when theaters were fully lit and very noisy. A whole range of legislative, administrative, architectural, and aesthetic reforms as well as state ordinances were needed to tame this quarrelsome and undisciplined mass and to transform it into a contemplative and empathic audience that became a function of the imagination. There is a close connection between the development of a theater that had become an agent of government and the emergence of increasingly effective mechanisms of theatrical illusion. Governmentality generates a new aesthetic that aims to steer the audience in certain directions, to determine and to control it. It goes without saying that theater, especially modern theater, has had a decisive effect in this direction. Theater was and is both an agent of governmentality and its critique. Now, this critique has manifested itself and continues to manifest itself in projects aimed at emancipating the public from any kind of governmentality via the stage itself. Yet the stage remains an agent of governmentality even as it seeks to evade this function. This is a paradox that is perhaps constitutive and necessary to theater. The question now is whether this paradox can be resolved and whether an autonomous emancipation of the audience—one that is not governed by the stage—can be imagined, and, if so, in what forms. Put otherwise, it is a question of whether the spectator “without someone else’s guidance” can alienate himself from this position and become a self-determined subject.
Breakdown of diameter selectivity in a reductive hydrogenation reaction of single-walled carbon nanotubes
Creators: name: Nemeth, Katalin
name: Jakab, Emma
name: Borondics, Ferenc
name: Tohati, Hajnalka M.
name: Pekker, Aron
name: Bokor, Monika
name: Verebelyi, Tamas
name: Tompa, Kalman
name: Pekker, Sandor
name: Kamaras, Katalin
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Reductive hydrogenation was applied to two types of single-walled carbon nanotubes with different diameter range. Alkali metal intercalation, followed by reaction with methanol, led to hydrogenated products. Both yield and selectivity of this reaction showed strong dependence on diameter, contrary to expectation based on simple curvature effects. The observed yield, as detected by thermogravimetry-mass spectroscopy and 1H-NMR, is drastically reduced in small-diameter tubes where the alkali dopant does not reach the inside of the bundles. Wide range optical transmission measurements were employed to determine the selectivity and indicate that besides higher yield, lower diameter selectivity occurs above a critical diameter.
description: 14 pages, 4 figures
Enhanced electrocaloric and energy-storage properties of environment-friendly ferroelectric Ba0.9Sr0.1Ti1-xSnxO3 ceramics
Creators: name: Zaitouni, Hajar
name: Hajji, Lahoucine
name: Mezzane, Daoud
name: Choukri, El Hassan
name: Razumnaya, Anna
name: Gagou, Yaovi
name: Hoummada, Khalid
name: Alimoussa, Abdelhadi
name: Rozic, Brigita
name: Cresnar, Dejvid
name: Marssi, Mimoun El
name: Kutnjak, Zdravko
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The electrocaloric (EC) effect and energy storage properties of eco-friendly ferroelectric Ba0.9Sr0.1Ti1-xSnxO3 (BSTS-x) ceramics prepared by the conventional solid-state reaction method were studied. Significant energy efficiency exceeding 80% was found in our samples. In particular, BSTS-5 and BSTS-10 samples exhibit 92% and 88% efficiency, respectively, over a wide temperature range around room temperature (RT). Direct EC measurement and an indirect method based on the thermodynamic approach were used to characterize the EC effect, and both yielded consistent results. The largest electrocaloric responsivity of 0.73 K mm/kV was obtained for BSTS-0 at 368 K with an adiabatic temperature change DT(EC) of 0.55 K at a low applied electric field of only 7.4 kV/cm. With increasing Sn-content, the EC response of BSTS-x ceramics decreases, while their diffuseness increases over an extensive temperature range, centered at RT. A significant coefficient of performance (COP > 26) was found for our samples. The obtained results demonstrate the possibility of designing eco-friendly materials with higher EC effect and energy efficiency for potential solid-state refrigeration and energy storage devices.
Testing primordial non-Gaussianities on galactic scales at high redshift
Creators: name: Habouzit, Mélanie
name: Nishimichi, Takahiro
name: Peirani, Sébastien
name: Mamon, Gary A.
name: Silk, Joseph
name: Chevallard, Jacopo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Primordial non-Gaussianities provide an important test of inflationary models. Although the Planck CMB experiment has produced strong limits on non-Gaussianity on scales of clusters, there is still room for considerable non-Gaussianity on galactic scales. We have tested the effect of local non-Gaussianity on the high redshift galaxy population by running five cosmological N-body simulations down to z=6.5. For these simulations, we adopt the same initial phases, and either Gaussian or scale-dependent non-Gaussian primordial fluctuations, all consistent with the constraints set by Planck on clusters scales. We then assign stellar masses to each halo using the halo - stellar mass empirical relation of Behroozi et al. (2013). Our simulations with non-Gaussian initial conditions produce halo mass functions that show clear departures from those obtained from the analogous simulations with Gaussian initial conditions at z>~10. We observe a >0.3 dex enhancement of the low-end of the halo mass function, which leads to a similar effect on the galaxy stellar mass function, which should be testable with future galaxy surveys at z>10. As cosmic reionization is thought to be driven by dwarf galaxies at high redshift, our findings may have implications for the reionization history of the Universe.
description: 6 pages, 3 figures, 1 table, MNRAS (Letters) in press
Effects of Non-idealities and Quantization of the Center of Mass Motion on Symmetric and Asymmetric Collective States in a Collective State Atomic Interferometer
Creators: name: Sarkar, Resham
name: Kim, May E.
name: Fang, Renpeng
name: Tu, Yanfei
name: Shahriar, Selim M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the behavior of an ensemble of $N$ non-interacting, identical atoms, excited by a laser. In general, the $i$-th atom sees a Rabi frequency $Ω_i$, an initial position dependent laser phase $ϕ_i$, and a motion induced Doppler shift of $δ_i$. When $Ω_i$ or $δ_i$ is distinct for each atom, the system evolves into a superposition of $2^N$ intercoupled states, of which there are $N+1$ symmetric and $(2^N-(N+1))$ asymmetric collective states. For a collective state atomic interferometer (COSAIN) we recently proposed, it is important to understand the behavior of all the collective states under various conditions. In this paper, we show how to formulate the properties of these states under various non-idealities, and use this formulation to understand the dynamics thereof. We also consider the effect of treating the center of mass degree of freedom of the atoms quantum mechanically on the description of the collective states, illustrating that it is indeed possible to construct a generalized collective state, as needed for the COSAIN, when each atom is assumed to be in a localized wave packet. The analysis presented in this paper is important for understanding the dynamics of the COSAIN, and will help advance the analysis and optimization of spin squeezing in the presence of practically unavoidable non-idealities as well as in the domain where the center of mass motion of the atoms is quantized.
description: Title, abstract and text edited
title: The energy landscapes of metamorphic proteins
Creators: name: Seifi, Bahman
Publisher: name: Memorial University of Newfoundland
Year: 2023

description: Most proteins fold into a unique three-dimensional structure called the native state. Recently some examples have been found of so-called metamorphic proteins that undergo reversible large-scale structural transformations between different native states. In this thesis, we develop simulation methods and models to study the thermodynamics of these transformations, both at the coarse-grained and all-atom levels. Because our understanding of the physics fold switching is incomplete, our models utilize in part so-called structure-based or Gō-like potentials, which provide energetic bias towards one, or more, native states. We employ these computational methods to two different fold switch systems: the bacterial protein RfaH and the engineered fold switch system GA/GB. Our models are developed and tested on experimental data for these systems. We study both equilibrium properties, such as stability properties and the characteristics of their energy landscapes, and kinetic properties, such as the mechanism that trigger fold switching and molecular details of the fold switch process. We also study, for the GA/GB system, what role macromolecular crowding effects play for controlling which of the native states is most stable.
The impact of GNSS multipath errors on ZTD estimates based on PPP
Creators: name: Shengping He
name: Becker, Doris
name: Hobiger, Thomas
Publisher: name: Zenodo
Year: 2022
Subjects: Troposphere, multipath mitigation, simulation test, extended Kalman-filter

description: Multipath is a large systematic GNSS error source which can bias ZTD estimation, e.g. within PPP. Since it usually occurs at low elevation angles, where the mapping function values become large and thus significantly contribute to troposphere estimation, one can not simply exclude those observations. Given that the multipath environment needs to be carefully modelled at every site, it is difficult to develop a general mitigation approach. This is even more challenging as more and more low-cost stations are currently being installed. With the progress of ZTD estimation from high-precision/low-cost/real-time stations, the research on multipath errors becomes particularly important. With the help of a commercial GNSS simulator, it is possible to study the impact of multipath effects on ZTD estimates and try to develop the mitigation strategies of general nature.
Descope of the ALIA mission
Creators: name: Gong, Xuefei
name: Lau, Yun-Kau
name: Xu, Shengnian
name: Amaro-Seoane, Pau
name: Bai, Shan
name: Bian, Xing
name: Cao, Zhoujian
name: Chen, Gerui
name: Chen, Xian
name: Ding, Yanwei
name: Dong, Peng
name: Gao, Wei
name: Heinzel, Gerhard
name: Li, Ming
name: Li, Shuo
name: Liu, Fukun
name: Luo, Ziren
name: Shao, Mingxue
name: Spurzem, Rainer
name: Sun, Baosan
name: Tang, Wenlin
name: Wang, Yan
name: Xu, Peng
name: Yu, Pin
name: Yuan, Yefei
name: Zhang, Xiaomin
name: Zhou, Zebing
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The present work reports on a feasibility study commissioned by the Chinese Academy of Sciences of China to explore various possible mission options to detect gravitational waves in space alternative to that of the eLISA/LISA mission concept. Based on the relative merits assigned to science and technological viability, a few representative mission options descoped from the ALIA mission are considered. A semi-analytic Monte Carlo simulation is carried out to understand the cosmic black hole merger histories starting from intermediate mass black holes at high redshift as well as the possible scientific merits of the mission options considered in probing the light seed black holes and their coevolution with galaxies in early Universe. The study indicates that, by choosing the armlength of the interferometer to be three million kilometers and shifting the sensitivity floor to around one-hundredth Hz, together with a very moderate improvement on the position noise budget, there are certain mission options capable of exploring light seed, intermediate mass black hole binaries at high redshift that are not readily accessible to eLISA/LISA, and yet the technological requirements seem to within reach in the next few decades for China.
Neural Methods for Logical Reasoning Over Knowledge Graphs
Creators: name: Amayuelas, Alfonso
name: Zhang, Shuai
name: Rao, Susie Xi
name: Zhang, Ce
Publisher: name: arXiv
Year: 2022
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Reasoning is a fundamental problem for computers and deeply studied in Artificial Intelligence. In this paper, we specifically focus on answering multi-hop logical queries on Knowledge Graphs (KGs). This is a complicated task because, in real-world scenarios, the graphs tend to be large and incomplete. Most previous works have been unable to create models that accept full First-Order Logical (FOL) queries, which include negative queries, and have only been able to process a limited set of query structures. Additionally, most methods present logic operators that can only perform the logical operation they are made for. We introduce a set of models that use Neural Networks to create one-point vector embeddings to answer the queries. The versatility of neural networks allows the framework to handle FOL queries with Conjunction ($\wedge$), Disjunction ($\vee$) and Negation ($\neg$) operators. We demonstrate experimentally the performance of our model through extensive experimentation on well-known benchmarking datasets. Besides having more versatile operators, the models achieve a 10\% relative increase over the best performing state of the art and more than 30\% over the original method based on single-point vector embeddings.
description: 14 pages, 5 figures, 11 tables
Generation of vacuum ultraviolet radiation by intracavity high-harmonic generation toward state detection of single trapped ions
Creators: name: Wakui, Kentaro
name: Hayasaka, Kazuhiro
name: Ido, Tetsuya
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: VUV radiation around 159 nm is obtained toward direct excitation of a single trapped $^{115}$In$^{+}$ ion. An efficient fluoride-based VUV output-coupler is employed for intracavity high-harmonic generation of a Ti:S oscillator. Using this coupler, where we measured its reflectance to be about 90%, an average power reaching $6.4\,μ$W is coupled out from a modest fundamental power of 650 mW. When a single comb component out of $1.9\times10^{5}$ teeth is resonant to the atomic transition, hundreds of fluorescence photons per second will be detectable under a realistic condition.
description: 9 pages, 8 figures; accepted for publication in Applied Physics B: Lasers and Optics
Reducing Positional Variance in Cross-sectional Abdominal CT Slices with Deep Conditional Generative Models
Creators: name: Yu, Xin
name: Yang, Qi
name: Tang, Yucheng
name: Gao, Riqiang
name: Bao, Shunxing
name: Cai, LeonY.
name: Lee, Ho Hin
name: Huo, Yuankai
name: Moore, Ann Zenobia
name: Ferrucci, Luigi
name: Landman, Bennett A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: 2D low-dose single-slice abdominal computed tomography (CT) slice enables direct measurements of body composition, which are critical to quantitatively characterizing health relationships on aging. However, longitudinal analysis of body composition changes using 2D abdominal slices is challenging due to positional variance between longitudinal slices acquired in different years. To reduce the positional variance, we extend the conditional generative models to our C-SliceGen that takes an arbitrary axial slice in the abdominal region as the condition and generates a defined vertebral level slice by estimating the structural changes in the latent space. Experiments on 1170 subjects from an in-house dataset and 50 subjects from BTCV MICCAI Challenge 2015 show that our model can generate high quality images in terms of realism and similarity. External experiments on 20 subjects from the Baltimore Longitudinal Study of Aging (BLSA) dataset that contains longitudinal single abdominal slices validate that our method can harmonize the slice positional variance in terms of muscle and visceral fat area. Our approach provides a promising direction of mapping slices from different vertebral levels to a target slice to reduce positional variance for single slice longitudinal analysis. The source code is available at: https://github.com/MASILab/C-SliceGen.
description: 11 pages, 4 figures
A filosofia Kaizen nas pequenas e médias empresas da região oeste de Portugal
Creators: name: Vicente, Célia
name: Fonseca, Kassandra
name: Fonseca, Kassandra
Publisher: name: Revista de Informação Contábil
Year: 2022
Subjects: PME, melhoria contínua, colaboradores, simplicidade.

description: Objetivo – O objetivo principal desta investigação é averiguar que importância é que as pequenas e médias empresas (PME) da região oeste atribuem à filosofia de gestão Kaizen. Metodologia – Foi elaborado e enviado um questionário a 100 PME da região oeste de Portugal, e destas obtiveram-se 23 respostas de PME (correspondendo a uma taxa de resposta de 23%). Resultados – Verificou-se que a filosofia Kaizen não é conhecida pela maioria das pequenas e médias empresas inquiridas, porém verificou-se que todas consideram a melhoria contínua algo a fazer sempre que possível. As técnicas que utilizam maioritariamente são a orientação para o cliente, a melhoria da produtividade e o desenvolvimento de novos produtos ou serviços. Contribuição – Com esta investigação pretende-se preencher lacunas de estudos realizados anteriormente pois na sua maioria tratam-se de estudos de caso de grandes empresas de um determinado setor. Espera-se também obter conhecimento sobre quais as técnicas da filosofia Kaizen mais conhecidas e utilizadas pelas PME. Palavras-chave: PME, melhoria contínua, colaboradores, simplicidade.
description: Revista de Informação Contábil, v. 16 (2022): Publicação contínua
Knotted globular ring polymers: how topology affects statistics and thermodynamics
Creators: name: Baiesi, Marco
name: Orlandini, Enzo
name: Stella, Attilio L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The statistical mechanics of a long knotted collapsed polymer is determined by a free-energy with a knot-dependent subleading term, which is linked to the length of the shortest polymer that can hold such knot. The only other parameter depending on the knot kind is an amplitude such that relative probabilities of knots do not vary with the temperature $T$, in the limit of long chains. We arrive at this conclusion by simulating interacting self-avoiding rings at low $T$ on the cubic lattice, both with unrestricted topology and with setups where the globule is divided by a slip link in two loops (preserving their topology) which compete for the chain length, either in contact or separated by a wall as for translocation through a membrane pore. These findings suggest that in macromolecular environments there may be entropic forces with a purely topological origin, whence portions of polymers holding complex knots should tend to expand at the expense of significantly shrinking other topologically simpler portions.
description: 11 figures, accepted in Macromolecules
ANÁLISE DAS DISCIPLINAS DE CONTEÚDOS PROFISSIONAIS NA GRADUAÇÃO DE CIÊNCIAS CONTÁBEIS: UM OLHAR SOBRE INSTITUIÇÕES DE ENSINO DO ESTADO DO RIO GRANDE DO SUL
Creators: name: Prodocimo, Gabriel Silva
name: Manke, Rosana Vieira
name: Gomes, Débora Gomes De
name: Frare, Anderson Betti
Publisher: name: Revista de Informação Contábil
Year: 2022
Subjects: Ciências Contábeis; Conteúdos profissionais; Instituições de Ensino Superior; Projeto Pedagógico de Curso.

description: Este estudo teve por objetivo analisar as disciplinas que abordam os conteúdos profissionais de contabilidade, em cursos de graduação de Ciências Contábeis, de universidades públicas e privadas do estado do Rio Grande Sul. Para atingir tal propósito buscou-se pelas instituições ativas no portal do Ministério da Educação, resultando em 96 instituições. Posteriormente, foram acessados os endereços eletrônicos das Instituições de Ensino Superior, a fim de ter acesso aos seus Projeto Pedagógico de Curso, resultando em 10 Instituições de ensino. A pesquisa possui abordagem qualitativa e cunho descritivo, no qual os resultados demonstram que instituições que ofertam menor número de disciplinas não necessariamente possuem menor carga horária de conteúdo profissional. A FADISMA possui maior carga horária de conteúdo profissional e ultrapassa o número de horas recomendado, enquanto a FACCAT é a instituição com menor carga horária de conteúdo profissional. Verifica-se que algumas Instituições não seguem a carga horária recomendada pela Fundação Brasileira de Contabilidade por áreas de conhecimento, sendo elas: Pública, Auditoria, Empresarial, Perícia e Sistema de Informação. A pesquisa demonstra semelhanças e diferenças entre Instituições públicas e privadas quanto ao conteúdo e carga horária ofertada. Desta forma, algumas instituições seguem o conteúdo profissional recomendado e outras se aproximam. O estudo contribui com a projeção do trajeto acadêmico do discente, também para futuras revisões no currículo das Instituições e no fomento a divulgação dos Projetos Pedagógicos dos Cursos por parte das Instituições de Ensino Superior.
description: Revista de Informação Contábil, v. 16 (2022): Publicação contínua
Do Universal Parenting Interventions Prevent Anxiety, Depression and Anger Problems in Adolescents? A Systematic Review of the Literature
Creators: name: Professor Chris Williams
name: Reid, Natalie
Publisher: name: OSF Registries
Year: 2023
Subjects: subject: Child Psychology
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: Universal parenting interventions can offer a brief, low intensity treatment option which is cost-effective and fits well within a stepped model of care. However, to date research specific to the adolescent population focuses on targeting problematic behaviour, rather than preventing internalising problems such as anxiety, depression and anger. This review aims to examine whether parenting interventions are helpful for preventing anxiety, depression and anger in adolescents.
Covariant holography of a tachyonic accelerating universe
Creators: name: Rozas-Fernández, Alberto
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We apply the holographic principle to a flat dark energy dominated Friedmann-Robertson-Walker spacetime filled with a tachyon scalar field with constant equation of state $w=p/ρ$, both for $w>-1$ and $w
description: 7 pages, 4 figures, one reference added, matches published version
Tourism's trend Ranking on Social Media Data Using Fuzzy-AHP vs. AHP
Creators: name: Saifullah, Shoffan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: Tourism is an exciting thing to be visited by people in the world. Search for attractive and popular places can be done through social media. Data from social media or websites can be used as a reference to find current travel trends and get information about reviews, stories, likes, forums, blogs, and feedback from a place. However, if the search is done manually one by one, it takes a long time, and it becomes interesting to do research. So, searching based on current trends will be easier and faster. For this reason, this study uses a computer base to search by ranking tourist facilities from social media data or websites using the multi-criteria decision-making (MCDM) method. The implementation of the method used in finding the trend is the Fuzzy-AHP method in comparison with the AHP. The data used is data reviews, stories, likes, forums, blogs, and feedback from the web or social media. Because with these components, tourism can be developed according to visitors\'' wishes. The research aims to rank facilities\'' tourism attractions (trends) and development priorities. The priority and ranking used the fuzzy-AHP and AHP method to determine weight criteria and the ranking process. The highest ranking is on the Parks/Picnic Spots attraction, and make it a priority to develop. The methods have an average value MSE of all data is \approx 0.0002, which can be used for this ranking.
description: 7 pages, 5 Tables, 3 figures
Decision making procedures in data management and data stewardship for Open Science
Creators: name: Clare, Connie
Publisher: name: Zenodo
Year: 2022

description: About the Speaker:
 Connie Clare, Community Development Manager, Research Data Alliance The Research Data Alliance (RDA) is a global organisation with over 12,900 members from148 countries, and is built on principles that include openness, inclusivity and transparency. The RDA was launched as a community-driven initiative in 2013 by the European Commission, the United States Government's National Science Foundation and National Institute of Standards and Technology, and the Australian Government’s Department of Innovation with the goal of building the social and technical infrastructure to enable open sharing and re-use of data. The RDA has a grass-roots, inclusive approach covering all data lifecycle stages, engaging data producers, users and stewards, addressing data exchange, processing, and storage. It has succeeded in creating the neutral social platform where international research data experts meet to exchange views and to agree on topics including social hurdles on data sharing, education and training challenges, data management plans and certification of data repositories, disciplinary and interdisciplinary interoperability, as well as technological aspects. The RDA Foundation provides the core business operations of RDA and represents RDA globally. About the presentation:
 This presentation was delivered at the EOSC Symposium 2022 'International Workshop on Developing an Ethics Framework for Artificial Intelligence n Support of Collaboration and Resource Sharing for Open Science' organised by the EOSC-Future/RDA Artificial Intelligence & Data Visitation Working Group (AIDV-WG). The presentation provides an overview of the decisions that are made by researchers in order to create and share FAIR data, as well as some ethical challenges associated with data stewardship of AI.