cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Lexical and grammatical elicitation: Ditransitives
Creators: name: Kipkoech, Linus
name: Bossi, Madeline
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: sgc

description: Two .wav files (I with lavalier mic, M with in-recorder mic). See Notebook 1 (file bundle 2019-26.001). Elicitation of nouns and ditransitive verb structures.
Causal effects of the Fed's large-scale asset purchases on firms' capital structure
Creators: name: Nocera, A.
name: Pesaran, M. H.
Publisher: name: Faculty of Economics, University of Cambridge
Year: 2022
Subjects: Capital structure
identification
interactive effects
leverage
quantitative easing
unconventional monetary policy

description: This paper investigates the short- and long-term impacts of the Federal Reserve’s large-scale asset purchases (LSAPs) on the capital structure of U.S. non-financial firms. To isolate the effects of LSAPs from the impact of concurrent macroeconomic conditions, we exploit cross-industry variations in the ability of firms therein to raise external funds without exhausting their debt capacity. We show that firms’ responses to LSAPs strongly depend on the financing decisions of other peers in the same industry. The higher the proportion of firms without high debt burdens in an industry, the stronger the response of firms within the industry to the Fed’s asset purchases. Overall, our results show that LSAPs facilitated firms’ access to debt financing and that the impacts of LSAPs on firms’ capital structure are likely to be long-lasting.
Wigner formula of rotation matrices and quantum walks
Creators: name: Miyazaki, Takahiro
name: Katori, Makoto
name: Konno, Norio
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Quantization of a random-walk model is performed by giving a qudit (a multi-component wave function) to a walker at site and by introducing a quantum coin, which is a matrix representation of a unitary transformation. In quantum walks, the qudit of walker is mixed according to the quantum coin at each time step, when the walker hops to other sites. As special cases of the quantum walks driven by high-dimensional quantum coins generally studied by Brun, Carteret, and Ambainis, we study the models obtained by choosing rotation as the unitary transformation, whose matrix representations determine quantum coins. We show that Wigner's $(2j+1)$-dimensional unitary representations of rotations with half-integers $j$'s are useful to analyze the probability laws of quantum walks. For any value of half-integer $j$, convergence of all moments of walker's pseudovelocity in the long-time limit is proved. It is generally shown for the present models that, if $(2j+1)$ is even, the probability measure of limit distribution is given by a superposition of $(2j+1)/2$ terms of scaled Konno's density functions, and if $(2j+1)$ is odd, it is a superposition of $j$ terms of scaled Konno's density functions and a Dirac's delta function at the origin. For the two-, three-, and four-component models, the probability densities of limit distributions are explicitly calculated and their dependence on the parameters of quantum coins and on the initial qudit of walker is completely determined. Comparison with computer simulation results is also shown.
description: v2: REVTeX4, 15 pages, 4 figures
Laser-induced torques in metallic antiferromagnets
Creators: name: Freimuth, Frank
name: Blügel, Stefan
name: Mokrousov, Yuriy
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study the laser-induced torques in the antiferromagnet (AFM) Mn$_2$Au. We find that even linearly polarized light may induce laser-induced torques in Mn$_2$Au, i.e., the light does not have to be circularly polarized. The laser-induced torques in Mn$_2$Au are comparable in magnitude to those in the ferromagnets Fe, Co and FePt at optical frequencies. We also compute the laser-induced torques at terahertz (THz) frequencies and compare them to the spin-orbit torques (SOTs) excited by THz laser-pulses. We find the SOTs to be dominant at THz frequencies for the laser-field strengths used in experiments. Additionally, we show that the matrix elements of the spin-orbit interaction (SOI) can be used to add SOI only during the Wannier interpolation, which we call Wannier interpolation of SOI (WISOI). This technique allows us to perform the Wannier interpolation conveniently for many magnetization directions from a single set of Wannier functions.
A survey of Kootenay music educators’ attitudes towards music education philosophies
Creators: name: Rogers, Donald Henry
Publisher: name: University of British Columbia
Year: 2008

description: This study is an investigation of Kootenay Music Educators' attitudes toward four philosophical approaches as defined by a previous study by Hanley (1989). The four philosophical approaches are: hedonic, absolute expressionist, formalist, and referentialist. Q-methodology was used as the instrument to gather data about the subjects' perception of two teaching situations: their “actual” teaching practice and their perception of an “ideal” teaching practice. The findings revealed diversity of philosophical approaches in the "actual" sort similar to previous studies. In addition to the four proposed philosophical types, as fifth types "subjectivist" was also found. The "ideal" sort suggested that the absolute - expressionist is the preferred approach although disagreement of rejected statements varied greatly. The hedonic approach was also significantly present. The findings are discussed in light of the tenuous support for music education. The call for music educators to engage the issue of philosophy in music education is made. The development of a more definable foundation for the role of music education within the total curriculum is suggested to be only possible after educators, administrators, and the public enter into the process of philosophical investigation.
Observation and spectroscopy of proton-unbound nucleus $^{21}$Al
Creators: name: Kostyleva, D.
name: Xu, X. -D.
name: Mukha, I.
name: Acosta, L.
name: Bajzek, M.
name: Casarejos, E.
name: Ciemny, A. A.
name: Cortina-Gil, D.
name: Dominik, W.
name: Dueñas, J. A.
name: Espino, J. M.
name: Estradé, A.
name: Farinon, F.
name: Fomichev, A.
name: Geissel, H.
name: Gómez-Camacho, J.
name: Gorshkov, A.
name: Grigorenko, L. V.
name: Janas, Z.
name: Kamiński, G.
name: Kiselev, O.
name: Knöbel, R.
name: Korsheninnikov, A. A.
name: Krupko, S.
name: Kuich, M.
name: Kurz, N.
name: Litvinov, Yu. A.
name: Marquinez-Durán, G.
name: Martel, I.
name: Mazzocchi, C.
name: Nikolskii, E. Yu.
name: Nociforo, C.
name: Ordúz, A. K.
name: Pfützner, M.
name: Pietri, S.
name: Pomorski, M.
name: Prochazka, A.
name: Rodríguez-Tajes, C.
name: Rymzhanova, S.
name: Sánchez-Benítez, A. M.
name: Scheidenberger, C.
name: Simon, H.
name: Sitar, B.
name: Slepnev, R.
name: Stanoiu, M.
name: Strmen, P.
name: Sümmerer, K.
name: Szarka, I.
name: Takechi, M.
name: Tanaka, Y. K.
name: Weick, H.
name: Winfield, J. S.
name: Woods, P. J.
name: Zhukov, M. V.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We report on the observation of previously-unknown isotope $^{21}$Al, the first unbound aluminum isotope located beyond the proton dripline. The $^{21}$Al nucleus decays by one-proton (1p) emission, and its in-flight decays were detected by tracking trajectories of all decay products with micro-strip silicon detectors. The 1p-emission processes were studied by analyses of the measured angular correlations of decay products $^{20}$Mg+p. The 1p-decay energies of ground and low-lying excited states of $^{21}$Al, its mass excess and proton separation energy value $S_p$=$-1.1(1)$ MeV were determined.
description: 6 pages, 7 figures
Programmable Multi-responsive Nanocellulose-based Hydrogels with Embodied Logic
Creators: name: Arsuffi, Beatriz
name: Siqueira, Gilberto
name: Nyström, Gustav
name: Titotto, Silvia
name: Magrini, Tommaso
name: Daraio, Chiara
Publisher: name: arXiv
Year: 2024
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Programmable materials are desirable for a variety of functional applications that range from biomedical devices, actuators and soft robots to adaptive surfaces and deployable structures. However, current smart materials are often designed to respond to single stimuli (like temperature, humidity, or light). Here, a novel multi-stimuli-responsive composite is fabricated using direct ink writing (DIW) to enable programmability in both space and time and computation of logic operations. The composite hydrogels consist of double-network matrices of poly(N-isopropylacrylamide) (PNIPAM) or poly(acrylic acid) (PAA) and sodium alginate (SA) and are reinforced by a high content of cellulose nanocrystals (CNC) (14 wt%) and nanofibers (CNF) (1 wt%). These composites exhibit a simultaneously tunable response to external stimuli, such as temperature, pH, and ion concentration, enabling precise control over their swelling and shrinking behavior, shape, and mechanical properties over time. Bilayer hydrogel actuators are designed to display bidirectional bending in response to various stimuli scenarios. Finally, to leverage the multi-responsiveness and programmability of this new composite, Boolean algebra concepts are used to design and execute NOT, YES, OR, and AND logic gates, paving the way for self-actuating materials with embodied logic.
Neutrino Fast Flavor Conversions in Neutron-star Post-Merger Accretion Disks
Creators: name: Li, Xinyu
name: Siegel, Daniel M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A compact accretion disk may be formed in the merger of two neutron stars or of a neutron star and a stellar-mass black hole. Outflows from such accretion disks have been identified as a major site of rapid neutron-capture (r-process) nucleosynthesis and as the source of 'red' kilonova emission following the first observed neutron-star merger GW170817. We present long-term general-relativistic radiation magnetohydrodynamic simulations of a typical post-merger accretion disk at initial accretion rates of $\dot{M}\sim 1\,M_\odot\,\text{s}^{-1}$ over 400ms post-merger. We include neutrino radiation transport that accounts for effects of neutrino fast flavor conversions dynamically. We find ubiquitous flavor oscillations that result in a significantly more neutron-rich outflow, providing lanthanide and 3rd-peak r-process abundances similar to solar abundances. This provides strong evidence that post-merger accretion disks are a major production site of heavy r-process elements. A similar flavor effect may allow for increased lanthanide production in collapsars. The formalism presented here may also be used in simulations of core-collapse supernovae to explore whether fast conversions strengthen or weaken the explosion.
description: 7 pages, 3 figures, Accepted for publication in PRL
The effect of dust on Tremaine-Weinberg measurements
Creators: name: Gerssen, Joris
name: Debattista, Victor
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the effect of dust on the observed rotation rate of a stellar bar. The only direct way to measure this quantity relies on the Tremaine & Weinberg method which requires that the tracer satisfies the continuity equation. Thus it has been applied largely to early-type barred galaxies. We show using numerical simulations of barred galaxies that dust attenuation factors typically found in these systems change the observed bar pattern speed by 20-40 percent. We also address the effect of star formation on the TW method and find that it does not change the results significantly. The results presented here suggest that applications of the TW method can be extended to include barred galaxies covering the full range of Hubble type.
description: 10 pages, 7 figures. Accepted for publication in MNRAS
Roadway safety in China : a global comparison
Creators: name: Qi, Jinsong
Publisher: name: University of British Columbia
Year: 2008

description: In this paper, China's roadway traffic safety, as well as its socio-economic background and the traffic characteristics is reviewed and its statistics from various sources as well as those of a few other nations are analyzed. Compared with the largest population countries in the world, the number of accident fatalities in China is the highest. Accident patterns were analyzed and their characteristics were found to differ significantly from those expected in North America. The accident characteristics in China are: high proportions are bicycle-related accidents; more severe accidents are in suburban areas; most accidents happen on road sections away from intersections, especially at gates of major trip-attraction unit compounds; and most casualties are peasants. Accident causes were examined and the analysis revealed that drivers were responsible for most accidents and cyclists caused the second largest number of accidents. Violating traffic laws and regulations by both drivers and cyclists caused the majority of accidents. The analysis of accident trends in recent years indicates that the reduced rate of economic development may have caused a temporary drop in accident rates. Once the normal rate of development returns, China may have another increase of accidents unless further effective countermeasures are adopted. A model of roadway accident rates that extends the ideas of Trinca et al's study is presented in this paper. The stages of countries' development are connected with the rates of Traffic Safety (deaths per 10,000 motor vehicles), Personal Safety (deaths per 100,000 people) and Motorisation (number of registered motor vehicles per 1,000 people). The model assumes that a relationship exists between T, Traffic Safety; P, Population Safety; and M, Motorisation such that when vehicles are first introduced, motorisation is low, as is the population based death rate but Traffic Safety, measured by a vehicle based death rate, is high. The other extreme of the model is complete motorisation under which condition there is a decreasing, but fairly high, population based death rate and a low, and decreasing vehicle based death rate. Between these two extremes is a relationship that can be drawn from the data that distinguished developing from developed countries. The mechanism of the relationship is beyond the scope of the present study. China is starting to implement traffic safety countermeasures. Some of the existing countermeasures are reviewed and suggestions for possible new countermeasures are discussed. Based on the accident analysis, countermeasures should deal with: violations of traffic laws and regulations, improvement of the roadway and traffic management, and improvement of safety of bicycles. Any successful countermeasures taken from other countries must reflect the unique traffic situation of China.
Exact results for nonlinear Drude weights in the spin-1/2 XXZ chain
Creators: name: Tanikawa, Yuhi
name: Takasan, Kazuaki
name: Katsura, Hosho
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Nonlinear Drude weight (NLDW) is a new concept which characterizes the nonlinear transport in quantum many-body systems. We investigate these weights for the spin-1/2 XXZ chain in the critical regime. The effects of the Dzyaloshinskii-Moriya interaction and an external magnetic field are also studied. Solving the Bethe equations numerically, we obtain these weights for very large system sizes and identify parameter regimes where the weights diverge in the thermodynamic limit. These divergences appear in all the orders studied in this paper and can be regarded as a universal feature of the NLDWs. We study the origin of these divergences and reveal that they result from $\textit{nonanalytic}$ finite-size corrections to the ground state energy. Furthermore, we compute closed-form expressions for several weights in the thermodynamic limit and find excellent agreement with the numerical results.
description: 6+15 pages, 2+2 figures
A new Chiral Two-Matrix Theory for Dirac Spectra with Imaginary Chemical Potential
Creators: name: Akemann, G.
name: Damgaard, P. H.
name: Osborn, J. C.
name: Splittorff, K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We solve a new chiral Random Two-Matrix Theory by means of biorthogonal polynomials for any matrix size $N$. By deriving the relevant kernels we find explicit formulas for all $(n,k)$-point spectral (mixed or unmixed) correlation functions. In the microscopic limit we find the corresponding scaling functions, and thus derive all spectral correlators in this limit as well. We extend these results to the ordinary (non-chiral) ensembles, and also there provide explicit solutions for any finite size $N$, and in the microscopic scaling limit. Our results give the general analytical expressions for the microscopic correlation functions of the Dirac operator eigenvalues in theories with imaginary baryon and isospin chemical potential, and can be used to extract the tree-level pion decay constant from lattice gauge theory configurations. We find exact agreement with previous computations based on the low-energy effective field theory in the two special cases where comparisons are possible.
description: 31 pages 2 figures, v2 missing term in partially quenched results inserted, fig 2 updated
Smooth Boundaries to Cosmological HII Regions from Galaxy Clustering
Creators: name: Wyithe, Stuart
name: Loeb, Abraham
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The HII regions around quasars and galaxies at redshifts beyond the epoch of reionisation will provide prime targets for upcoming 21cm campaigns using a new generation of low-frequency radio observatories. Here we show that the boundaries of these HII regions will not be sharp. Rather, the clustering of sources near massive galaxies results in a neutral fraction that rises gradually towards large radii from an interior value near zero. A neutral fraction corresponding to the global background value is typically reached at a distance of 2-5 times the radius of the HII region around the central massive galaxy.
description: 5 Pages, 3 figures. Submitted to MNRAS
Light-induced fictitious magnetic fields for quantum storage in cold atomic ensembles
Creators: name: Wang, Jianmin
name: Dong, Liang
name: Wang, Xingchang
name: Zhou, Zihan
name: Zuo, Ying
name: Siviloglou, Georgios A.
name: Chen, J. F.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In this work, we have demonstrated that optically generated fictitious magnetic fields can be utilized to extend the lifetime of quantum memories in cold atomic ensembles. All the degrees of freedom of an AC Stark shift such as polarization, spatial profile, and temporal waveform can be readily controlled in a precise manner. Temporal fluctuations over several experimental cycles, and spatial inhomogeneities along a cold atomic gas have been compensated by an optical beam. The advantage of the use of fictitious magnetic fields for quantum storage stems from the speed and spatial precision that these fields can be synthesized. Our simple and versatile technique can find widespread application in coherent pulse and single-photon storage in any atomic species.
description: 14pages,8 figures
Markets & the City: Planning Interventions & Markets in Guwahati City, India
Creators: name: Barua, Taz Mazinder
Publisher: name: Faculty of Fine and Applied Arts Chulalongkorn University
Year: 2021
Subjects: Town Planning
Public Markets
Colonialism in Assam
Urban Space
Municipalities in Assam
India

description: Journal of Urban Culture Research, 23, -, 256-272
Applicability and Surrogacy of Uncorrelated Airspace Encounter Models at Low Altitudes
Creators: name: Underhill, Ngaire
name: Weinert, Andrew
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The National Airspace System (NAS) is a complex and evolving system that enables safe and efficient aviation. Advanced air mobility concepts and new airspace entrants, such as unmanned aircraft, must integrate into the NAS without degrading overall safety or efficiency. For instance, regulations, standards, and systems are required to mitigate the risk of a midair collision between aircraft. Monte Carlo simulations have been a foundational capability for decades to develop, assess, and certify aircraft conflict avoidance systems. These are often validated through human-in-the-loop experiments and flight testing. For many aviation safety studies, manned aircraft behavior is represented using dynamic Bayesian networks. The original statistical models were developed from 2008-2013 to support safety simulations for altitudes above 500 feet Above Ground Level (AGL). However, these models were not sufficient to assess the safety of smaller UAS operations below 500 feet AGL. In response, newer models with altitude floors below 500 feet AGL have been in development since 2018. Many of the models assume that aircraft behavior is uncorrelated and not dependent on air traffic services or nearby aircraft. Our research objective was to compare the various uncorrelated models of conventional aircraft and identify how the models differ. Particularly if models of rotorcraft were sufficiently different than models of fixed-wing aircraft to require type specific models. The primary contribution is guidance on which uncorrelated models to leverage when evaluating the performance of a collision avoidance system designed for low altitude operations. We also address which models can be surrogates for noncooperative aircraft without transponders.
description: 8 pages, 2 figures, 2 tables, 3995 total words
Charge Radius of Neutron-deficient $^{54}$Ni and Symmetry Energy Constraints Using the Difference in Mirror Pair Charge Radii
Creators: name: Pineda, Skyy V.
name: König, Kristian
name: Rossi, Dominic M.
name: Brown, B. Alex
name: Incorvati, Anthony
name: Lantis, Jeremy
name: Minamisono, Kei
name: Nörtershäuser, Wilfried
name: Piekarewicz, Jorge
name: Powel, Robert
name: Sommer, Felix
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The nuclear root-mean-square charge radius of $^{54}$Ni was determined with collinear laser spectroscopy to be $R(^{54}$Ni) = 3.737\,(3)~fm. In conjunction with the known radius of the mirror nucleus $^{54}$Fe, the difference of the charge radii was extracted as $ΔR_{\rm ch}$ = 0.049\,(4)~fm. Based on the correlation between $ΔR_{\rm ch}$ and the slope of the symmetry energy at nuclear saturation density ($L$), we deduced $20 \le L \le 70$\,MeV. The present result is consistent with the $L$ from the binary neutron star merger GW170817, favoring a soft neutron matter EOS, and barely consistent with the PREX-2 result within 1$σ$ error bands. Our result indicates the neutron-skin thickness of $^{48}$Ca as 0.15\,-\,0.19\,fm.
description: 6 total pages, 3 figures
The Creation of Single-Use Packaging from Leaves to Reduce the Plastic Waste
Creators: name: Asawadechsakdi, Wilai
Publisher: name: Faculty of Fine and Applied Arts Chulalongkorn University
Year: 2021
Subjects: Package Design
Single-Use Packaging
Leaf Packaging
Street Food
Plastic Waste
Pollution
Design Thinking Framework
Thailand

description: Journal of Urban Culture Research, 23, -, 273-286
Expanded Roles for Pharmacists in Medication Management for Surgical Inpatients
Creators: name: TRAN, TIM
Publisher: name: Monash University
Year: 2021
Subjects: subject: 111503 Clinical Pharmacy and Pharmacy Practice
subject: FOS: Clinical medicine
subject: 110323 Surgery

description: The medication management of surgical inpatients is complex. Medication errors and subsequent adverse drug events are common, and there are concerns about suboptimal and extended opioid use following surgery. This thesis examines expanded roles for pharmacists through assisting hospital medical officers with the prescribing of admission and discharge medications to reduce medication errors, reduce delays in the administration of venous thromboembolism prophylaxis, improve hospital discharge times and lower opioid discharge quantities.
AdS/CFT correspondence in the Euclidean context
Creators: name: Gottschalk, H.
name: Thaler, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences
subject: 81T20

description: We study two possible prescriptions for AdS/CFT correspondence by means of functional integrals. The considerations are non-perturbative and reveal certain divergencies which turn out to be harmless, in the sense that reflection-positivity and conformal invariance are not destroyed.
description: 20 pages, references and two remarks added
Società Italiana di Didattica delle Lingue e Linguistica Educativa (DILLE)
Creators: name: Balboni, Paolo
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2013

description:

DILLE (the Italian Society of Language Teaching Research and Educational Linguistics) is an academic association which gathers together most Italian researchers working in the area of language education, both in universities and in other institutions. Its aims are threefold: to share scientific knowledge through a yearly conference and a yearly bibliography of Italian publications concerning language education; to share information about language education policies and initiatives in Italy and around the world; to interact with the Ministry, together with other scientific societies in the field of humanities. DILLE has published several documents about CLIL, early language teaching, language teacher training, and so on, which can be found at www.dille.it.

description: EL.LE
An optical atomic clock using $4D_J$ states of rubidium
Creators: name: Duspayev, Alisher
name: Owens, Carlos
name: Dash, Bineet
name: Raithel, Georg
Publisher: name: arXiv
Year: 2024
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze an optical atomic clock using two-photon $5S_{1/2} \rightarrow 4D_J$ transitions in rubidium. Four one- and two-color excitation schemes to probe the fine-structure states $4D_{3/2}$ and $4D_{5/2}$ are considered in detail. We compare key characteristics of Rb $4D_J$ and $5D_{5/2}$ two-photon clocks. The $4D_J$ clock features a high signal-to-noise ratio due to two-photon decay at favorable wavelengths, low dc electric and magnetic susceptibilities, and minimal black-body shifts. Ac Stark shifts from the clock interrogation lasers are compensated by two-color Rabi-frequency matching. We identify a "magic" wavelength near 1060~nm, which allows for in-trap, Doppler-free clock-transition interrogation with lattice-trapped cold atoms. From our analysis of clock statistics and systematics, we project a quantum-noise-limited relative clock stability at the $10^{-13}/\sqrt{τ(s)}$-level, with integration time $τ$ in seconds, and a relative accuracy of $\sim 10^{-13}$. We describe a potential architecture for implementing the proposed clock using a single telecom clock laser at 1550~nm, which is conducive to optical communication and long-distance clock comparisons. Our work could be of interest in efforts to realize small and portable Rb clocks and in high-precision measurements of atomic properties of Rb $4D_J$-states.
description: A.D. and C.O. contributed equally to this work; 15 pages, 3 figures, 1 table
Menegale M. (ed.) (2013). Autonomy in Language Learning: Getting Learners Actively Involved [ePub], Canterbury, UK: IATEFL
Creators: name: Bier, Ada
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2013

description:

Recensione

description: EL.LE
Bosons in Disordered Optical Potentials
Creators: name: Louis, Pearl J. Y.
name: Tsubota, Makoto
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: In this work we systematically investigate the condensate properties, superfluid properties and quantum phase transitions in interacting Bose gases trapped in disordered optical potentials. We numerically solve the Bose-Hubbard Hamiltonian exactly for different: (a) types of disorder, (b) disorder strengths, and (c) interatomic interactions. The three types of disorder studied are: quasiperiodic disorder, uniform random disorder and random speckle-type disorder. We find that the Bose glass, as identified by Fisher et al [Phys. Rev. B {\bf 40}, 546 (1989)], contains a normal condensate component and we show how the three different factors listed above affect it.
description: 4 pages, 4 figures (low res) v2 Title,Abstract,Introduction: changes; Figure 3: Add label to axis
Ode to Dissipationless Electronics: Computational Design of Topological Materials
Creators: name: WANG, CHUTIAN
Publisher: name: Monash University
Year: 2021
Subjects: subject: 91205 Functional Materials
subject: FOS: Materials engineering
subject: 20403 Condensed Matter Modelling and Density Functional Theory
subject: FOS: Physical sciences

description: The development of modern electronics is limited by heat dissipation. Topological materials are new materials that conduct electrons without dissipating any heat. This thesis uses computational modeling techniques to design the topological materials and provides guidelines for later experimental realisation.
Deutscher, G. (2013). La lingua colora il mondo: Come le parole deformano la realtà. Torino: Bollati Boringhieri
Creators: name: Jiménez Pascual, Gonzalo
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2013

description:

description: EL.LE
Growth-associated messenger ribonucleic acid expression in a model of successful central nervous system regeneration
Creators: name: Pataky, David Michael
Publisher: name: University of British Columbia
Year: 2008

description: Recent experiments examining the development and plasticity of the chick embryonic spinal cord have described its inherent ability to recover from injury suffered prior to embryonic day (E) 13. Severing the spinal cord on or before E12 resulted in complete anatomical and functional recovery, which defined the permissive period for repair. Transections performed on E13 or later resulted in paraplegia characteristic of the restrictive period for repair. Previous studies have described the expression of growth-associated proteins (GAPs) such as GAP 43 and a-tubulin which were expressed at high levels during axon extension, then down-regulated at the time of target contact. These proteins were also expressed during abortive attempts at regeneration, and characterized a genetic growth program which was recruited after injury. This study examined the neuronal response to injury as reflected by changes in growth-associated gene expression in the hindbrain measured using Northern blotting. Levels of mRNA for GAP 43 and total a-tubulin during normal development were found to peak at E10-12, the period of maximal outgrowth of brainstem-spinal projections. Complete spinal cord transections performed on Ell (successful repair) or E14 (unsuccessful repair) did not detectably alter total a-tubulin mRNA levels. GAP 43 mRNA levels were not detectably altered after Eli transection. In contrast, transection on E14 (unsuccessful repair) resulted in a maintained increase in GAP 43 mRNA levels at least until 7 days post-transection, the longest survival period studied. Northern blotting was likely not sensitive enough to detect the full complement of changes which occurred after injury. However, transaction during the restrictive period for repair resulted in a maintained increase in GAP43 mRNA expression. These data suggested that some brainstem-spinal projection neurons injured on E14 retained the inherent ability to re-express at least part of the axonal growth program, indicated by the appropriate re-expression of GAP 43 mRNA. This suggests that the presence of inhibitory influences (or the absence of facilitatory influences) after E13 may have prevented the re-growth of axons and the re-formation of appropriate synapses.
Bosisio C. (2012). Interlingua e profilo d’apprendente: Uno sguardo diacronico tra linguistica acquisizionale e glottodidattica. Milano: EDUCatt
Creators: name: Bertelli, Anna
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2013

description:

description: EL.LE
Abdelilah-Bauer, B. (2013). Guida per genitori di bambini bilingui. Milano: Raffaello Cortina
Creators: name: Canuto, Luisa
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2013

description:

description: EL.LE
Giant asymmetry of the longitudinal magnetoresistance in high-mobility two-dimensional electron gas on a cylindrical surface
Creators: name: Vorob'ev, A. B.
name: Friedland, K. -J.
name: Kostial, H.
name: Hey, R.
name: Jahn, U.
name: Wiebicke, E.
name: Yukecheva, Ju. S.
name: Prinz, V. Ya.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A giant asymmetry in the magnetoresistance was revealed in high-mobility, two-dimensional electron gas on a cylindrical surface. The longitudinal resistance along the magnetic-field gradient impressed by the surface curvature was found to vanish if measured along one of the edges of the curved Hall bar. If the external magnetic field is reversed, then the longitudinal resistance vanishes at the opposite edge of the Hall bar. This asymmetry is analyzed quantitatively in terms of the Landauer-Buettiker formalism.
description: 7 pages, 3 figures; to appear in PRB
Electron- and hole-doping on ScH$_{2}$ and YH$_{2}$: Effects on superconductivity without applied pressure
Creators: name: Villa-Cortés, S.
name: De la Peña-Seaman, O.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present the evolution of the structural, electronic, and lattice dynamical properties, as well as the electron-phonon coupling and superconducting critical temperature ($T_c$) of ScH$_2$ and YH$_2$ metal hydrides solid solutions, as a function of the electron- and hole-doping content. The study was performed within the density functional perturbation theory, taking into account the effect of zero-point energy through the quasi-harmonic approximation, and the solid solutions Sc$_{1-x}M_{x}$H$_{2}$ ($M$=Ca,Ti) and Y$_{1-x}M_{x}$H$_{2}$ ($M$=Sr,Zr) were modeled by the virtual crystal approximation. We have found that, under hole-doping ($M$=Ca,Sr), the ScH$_2$ and YH$_2$ hydrides do not improve their electron-phonon coupling properties, sensed by $λ(x)$. Instead, by electron-doping ($M$=Ti,Zr), the systems reach a critical content $x \approx 0.5$ where the latent coupling is triggered, increasing $λ$ as high as $70\%$, in comparison with its $λ(x=0)$ value. Our results show that $T_c$ quickly decreases as a function of $x$ on the hole-doping region, from $x=0.2$ to $x=0.9$, collapsing at the end. Alternatively, for electron-doping, $T_c$ first decreases steadily until $x=0.5$, reaching its minimum, but for $x > 0.5$ it increases rapidly, reaching its maximum value of the entire range at the Sc$_{0.05}$Ti$_{0.95}$H$_2$ and Y$_{0.2}$Zr$_{0.8}$H$_2$ solid solutions, demonstrating that electron-doping can improve the superconducting properties of pristine metal hydrides, in the absence of applied pressure.
description: 8 pages, 8 figures
Robust Motion In-betweening
Creators: name: Harvey, Félix G.
name: Yurick, Mike
name: Nowrouzezahrai, Derek
name: Pal, Christopher
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Graphics (cs.GR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In this work we present a novel, robust transition generation technique that can serve as a new tool for 3D animators, based on adversarial recurrent neural networks. The system synthesizes high-quality motions that use temporally-sparse keyframes as animation constraints. This is reminiscent of the job of in-betweening in traditional animation pipelines, in which an animator draws motion frames between provided keyframes. We first show that a state-of-the-art motion prediction model cannot be easily converted into a robust transition generator when only adding conditioning information about future keyframes. To solve this problem, we then propose two novel additive embedding modifiers that are applied at each timestep to latent representations encoded inside the network's architecture. One modifier is a time-to-arrival embedding that allows variations of the transition length with a single model. The other is a scheduled target noise vector that allows the system to be robust to target distortions and to sample different transitions given fixed keyframes. To qualitatively evaluate our method, we present a custom MotionBuilder plugin that uses our trained model to perform in-betweening in production scenarios. To quantitatively evaluate performance on transitions and generalizations to longer time horizons, we present well-defined in-betweening benchmarks on a subset of the widely used Human3.6M dataset and on LaFAN1, a novel high quality motion capture dataset that is more appropriate for transition generation. We are releasing this new dataset along with this work, with accompanying code for reproducing our baseline results.
description: Published at SIGGRAPH 2020
Identifying trivial and Majorana zero-energy modes using the Majorana polarization
Creators: name: Awoga, Oladunjoye A.
name: Cayao, Jorge
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In this work we consider superconductor-semiconductor hybrids containing both trivial and Majorana zero modes and explore their signatures in the Majorana polarization. In particular, we consider trivial zero energy states due to confinement and disorder, which seem to be very likely experimental scenarios. We show that the Majorana polarization is able to characterize the topological phase transition as well as the emergence of Majorana zero modes even when trivial zero-energy states proliferate. Notably, the Majorana polarization inherits direct information about spatial correlations which are then the key for distinguishing Majorana and trivial zero-modes. We demonstrate the utility of the Majorana polarization in normal-superconductor junctions and superconductor-normal-superconductor Josephson junctions. Our results support the interpretation of the Majorana polarization as a real space topological indicator.
description: 8 pages, 6 figures + Supplementary 1 page, 1 figure (Published version)
Implementation of Artificial Neural Networks for the Nepta-Uranian Interplanetary (NUIP) Mission
Creators: name: Gore, Saurabh
name: Ntumba, Manuel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: A celestial alignment between Neptune, Uranus, and Jupiter will occur in the early 2030s, allowing a slingshot around Jupiter to gain enough momentum to achieve planetary flyover capability around the two ice giants. The launch of the uranian probe for the departure windows of the NUIP mission is between January 2030 and January 2035, and the duration of the mission is between six and ten years, and the launch of the Nepta probe for the departure windows of the NUIP mission is between February 2031 and April 2032 and the duration of the mission is between seven and ten years. To get the most out of alignment, deep learning methods are expected to play a critical role in autonomous and intelligent spatial guidance problems. This would reduce travel time, hence mission time, and allow the spacecraft to perform well for the life of its sophisticated instruments and power systems up to fifteen years. This article proposes a design of deep neural networks, namely convolutional neural networks and recurrent neural networks, capable of predicting optimal control actions and image classification during the mission. Nepta-Uranian interplanetary mission, using only raw images taken by optimal onboard cameras. It also describes the unique requirements and constraints of the NUIP mission, which led to the design of the communications system for the Nepta-Uranian spacecraft. The proposed mission is expected to collect telemetry data on Uranus and Neptune while performing the flyovers and transmit the obtained data to Earth for further analysis. The advanced range of spectrometers and particle detectors available would allow better quantification of the ice giant's properties.
description: 20 pages, 13 figures, 6 tables
MWA and ASKAP observations of atypical radio-halo-hosting galaxy clusters: Abell 141 and Abell 3404
Creators: name: Duchesne, S. W.
name: Johnston-Hollitt, M.
name: Wilber, A. G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We report on the detection of a giant radio halo in the cluster Abell 3404 as well as confirmation of the radio halo observed in Abell 141 (with linear extents $\sim 770$ kpc and $\sim 850$ kpc, respectively). We use the Murchison Widefield Array (MWA) in conjunction with the Australian Square Kilometre Array Pathfinder (ASKAP) and the Australia Telescope Compact Array (ATCA) to characterise the emission and intervening radio sources from $\sim100$-$1000$ MHz; power law models are fit to the spectral energy distributions with spectral indices $α_{88}^{1110} = -1.66 \pm 0.07$ and $α_{88}^{944} = -1.06 \pm 0.09$ for the radio halos in Abell 3404 and Abell 141, respectively. We find strong correlation between radio and X-ray surface brightness for Abell~3404 but little correlation for Abell~141. We note each cluster has an atypical morphology for a radio-halo--hosting cluster, with Abell 141 having been previously reported to be in a pre-merging state, and Abell 3404 is largely relaxed with only minor evidence for a disturbed morphology. We find that the radio halo power is consistent with the current radio halo sample and $P_ν$-$M$ scaling relations, but note that the radio halo in Abell 3404 is an ultra-steep-spectrum radio halo (USSRH) and, as with other USSRHs lies slightly below the best-fit $P_{1.4}$-$M$ relation. We find that an updated scaling relation is consistent with previous results and shifting the frequency to 150 MHz does not significantly alter the best-fit relations with a sample of 86 radio halos. We suggest that the USSRH halo in Abell 3404 represents the faint class of radio halos that will be found in clusters undergoing weak mergers.
description: 18 pages, 37 individual figure files, accepted for publication in PASA, including some updated measurements/derived quantities
Evolution of the angular momentum during gravitational fragmentation of molecular clouds
Creators: name: Arroyo-Chávez, G.
name: Vázquez-Semadeni, E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We investigate the origin of the observed scaling $j\sim R^{3/2}$ between the specific angular momentum $j$ and the radius $R$ of molecular clouds (MCs) and their their substructures, and of the observed near independence of $β$, the ratio of rotational to gravitational energy, from $R$. To this end, we measure the angular momentum (AM) of sets of particles in an SPH simulation of the formation, collapse and fragmentation of giant MCs. The sets of SPH particles are defined either as ``clumps'' (connected particle sets), or as lagrangian sets that conform a connected clump only at a certain time $\tdef$. We find that: {\it i)} Clumps evolve along the observed \jR\ relation at all times, {\it ii)} Lagrangian particle sets evolve along the observed relation when the volume containing them also contains a large number of other ``intruder'' particles. Otherwise, they evolve with $j\sim$ cst. {\it iii)} Tracking lagrangian sets to the future, we find that a subset of the SPH particles participates in the collapse, while another disperses away. {\it iv)} Noting that, under AM conservation, $β$ increases during contraction, we suggest that its near independence of radius may arise from the competition between this increase and an increase in the AM exchange rate at higher rotational energy density gradient. {\it v)} We suggest that, if MCs are globally dominated by gravity, the observed \jR\ relation arises because the observational selection of its dense structures amounts to selecting the fragments that have lost AM via Reynolds stresses from their neighbors.
description: 20 pages, 15 figures, submitted to ApJ, comments welcome
The radial distribution of blue straggler stars and the nature of their progenitors
Creators: name: Mapelli, M.
name: Sigurdsson, S.
name: Ferraro, F. R.
name: Colpi, M.
name: Possenti, A.
name: Lanzoni, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The origin of blue straggler stars (BSS) in globular clusters (GCs) is still not fully understood: they can form from stellar collisions, or through mass transfer in isolated, primordial binaries (PBs). In this paper we use the radial distribution of BSS observed in four GCs (M3, 47Tuc, NGC6752 and omega Cen) to investigate which formation process prevails. We find that both channels co-exist in all the considered GCs. The fraction of mass-transfer (collisional) BSS with respect to the total number of BSS is around ~0.4-0.5 (~0.5-0.6) in M3, 47Tuc, and NGC6752. The case of omega Cen is peculiar with an underproduction of collisional BSS. The relative lack of collisional BSS in omega Cen can be understood if mass segregation has not yet driven to the core a sizeable number of PBs, which dominate stellar collisions through three- and four-body processes. The spatial distribution of BSS provides strong hints to their origin: the BSS in the cluster outskirts form almost exclusively from mass transfer in PBs, whereas the BSS found close to the cluster core most likely have a collisional origin.
description: 9 pages, 5 figures, MNRAS, in press, matches the published version