cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Spurious detection of phase synchronization in coupled nonlinear oscillators
Creators: name: Xu, Limei
name: Chen, Zhi
name: Hu, Kun
name: Stanley, H. Eugene
name: Ivanov, Plamen Ch.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Coupled nonlinear systems under certain conditions exhibit phase synchronization, which may change for different frequency bands or with presence of additive system noise. In both cases, Fourier filtering is traditionally used to preprocess data. We investigate to what extent the phase synchronization of two coupled Rössler oscillators depends on (1) the broadness of their power spectrum, (2) the width of the band-pass filter, and (3) the level of added noise. We find that for identical coupling strengths, oscillators with broader power spectra exhibit weaker synchronization. Further, we find that within a broad band width range, band-pass filtering reduces the effect of noise but can lead to a spurious increase in the degree of synchronization with narrowing band width, even when the coupling between the two oscillators remains the same.
description: 4 pages,6 figures
Wettability and floatability of coal macerals as derived from flotations in methanol solutions
Creators: name: Holuszko, Maria Ewelina
Publisher: name: University of British Columbia
Year: 2010

description: In this study wettability and floatability of coal petrographic components were examined using the concept of critical surface tension. Two techniques were studied; film flotation and small-scale flotation tests. Both tests use Zisman’s concept of critical surface tension of solids. In these tests particles are separated according to their respective critical surface tension of wettability (film flotation) or critical surface tension of floatability (small-scale flotation). Surface heterogeneity of coal particles arises from the chemical composition of coal surface. The coal macerals are known to have different chemical composition and surface properties. Surface properties of macerals and their flotation response have usually been evaluated with the contact angle or direct flotation tests. In this study, the estimation of surface properties of coal macerals was accomplished by studying their critical surface tension of wettability and floatability. The wettability distributions of coal samples of various petrographic composition were obtained from film flotation. Wettability of petrographic components was evaluated in terms of an average critical surface tension of wettability. In small-scale flotation experiments, coal particles were separated according to their critical surface tension of floatability. Differences in floatability and wettability distributions of coal lithotypes and maceral concentrates are discussed. Microscopic examination of the products from film and small-scale flotations was used to further study the effect of coal petrographic composition on the wettability and floatability.
Using E-Mail as a Communication Aid in Teaching
Creators: name: Ramakrishnan, Dr. K. S.
name: Priya, Dr. V.
Publisher: name: figshare
Year: 2022
Subjects: classificationCode: 399999
subject: Other education not elsewhere classified

description:   
Two groups of students were taught by the conventional method by the authors. After teaching was over, the control group students were given the class notes and were clarified their queries by the authors in the classroom in the face-to-face mode. The experimental group students were delivered the class notes via e-mail; they sought and were given clarifications through email. The number of emails sent, the numbers received by the authors and the students, the satisfaction of the students with this method, and the subject content of the emails were analyzed. At the end of four weeks, a test was conducted to assess the relative effectiveness of the two methods. It was found that both the methods were equally effective. The authors conclude that in future, e-mails can be used to complement classroom teaching, especially in the distance mode of education where the students can have face-to-face interaction with the faculty only for a short duration.
Tribochemistry, mechanical alloying, mechanochemistry: what is in a name?
Creators: name: Michalchuk, Adam A. L.
name: Boldyreva, Elena V.
name: Belenguer, Ana M.
name: Emmerling, Franziska
name: Boldyrev, Vladimir V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Over the decades, the application of mechanical force to influence chemical reactions has been called by various names: mechanochemistry, tribochemistry, mechanical alloying, to name but a few. The evolution of these terms has largely mirrored the understanding of the field. But what is meant by these terms, why have they evolved, and does it really matter how a process is called? Which parameters should be defined to describe unambiguously the experimental conditions such that others can reproduce the results, or to allow a meaningful comparison between processes explored under different conditions? Can the information on the process be encoded in a clear, concise, and self-explanatory way? We address these questions in this Opinion contribution, which we hop
Monte Carlo simulation of the electron transport through thin slabs: A comparative study of PENELOPE, GEANT3, GEANT4, EGSnrc and MCNPX
Creators: name: Vilches, M.
name: Garcia-Pareja, S.
name: Guerrero, R.
name: Anguiano, M.
name: Lallena, A. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: The Monte Carlo simulation of the electron transport through thin slabs is studied with five general purpose codes: PENELOPE, GEANT3, GEANT4, EGSnrc and MCNPX. The different material foils analyzed in the old experiments of Kulchitsky and Latyshev [Phys. Rev. 61 (1942) 254-266] and Hanson et al. [Phys. Rev. 84 (1951) 634-637] are used to perform the comparison between the Monte Carlo codes. Non-negligible differences are observed in the angular distributions of the transmitted electrons obtained with the some of the codes. The experimental data are reasonably well described by EGSnrc, PENELOPE (v. 2005) and GEANT4. A general good agreement is found for EGSnrc and GEANT4 in all the cases analyzed.
description: 13 pages, 8 figures, 5 tables. Accepted for publication in Nuclear Instruments and Methods in Physics Research B
Bergman kernels and the pseudoeffectivity of relative canonical bundles
Creators: name: Berndtsson, Bo
name: Paun, Mihai
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 14D06

description: The main result of the present article is a (practically optimal) criterium for the pseudoeffectivity of the twisted relative canonical bundles of surjective projective maps. Our theorem has several applications in algebraic geometry; to start with, we obtain the natural analytic generalization of some semipositivity results due to E. Viehweg and F. Campana. As a byproduct, we give a simple and direct proof of a recent result due to C. Hacon--J. McKernan, S. Takayama and H. Tsuji concerning the extension of twisted pluricanonical forms. More applications will be offered in the sequel of this article.
description: This is the third revision
Vista da dietro la consolle. Spunti e riflessioni attorno alla giornata di studi sulle musiche elettroniche da ballo
Creators: name: Cosi, Claudio
name: Cestino, Giovanni
Publisher: name: Pavia University Press - Edizioni dell'Università degli Studi di Pavia
Year: 2014

description: Il pomeriggio della giornata di studi si è aperto con la voce di Alessio Bertallot, DJ e conduttore del programma B-Side di Radio Deejay, e dal 2010 al 2013 di Rai Tunes, trasmissione del palinsesto di Radio2. Ciò che Bertallot ha voluto proporre al nutrito uditorio dell’Aula Magna del Dipartimento di Musicologia e Beni Culturali è stata una breve e appassionante panoramica storica di un repertorio, quello della popular music elettronica contemporanea, ancora troppo recente per essere storicizzato, come ha precisato lo stesso DJ all’inizio del suo intervento. Scopo delle pagine che seguono è dunque da un lato quello di enucleare e sintetizzare i punti di maggiore interesse del discorso di Bertallot, dall’altro quello di offrire al lettore alcuni spunti di riflessione sui problemi più rilevanti emersi durante il dibattito che ha chiuso la giornata di studi. In questo modo si intende anche puntare l’attenzione sull’importanza che questi generi musicali ricoprono non solo all’interno dei cosiddetti popular music studies, ma anche nel più vasto panorama della ricerca musicologica.
description: Philomusica on-line, Vol 13, N° 2 (2014): Just for Dancing? Studi italiani sulle musiche elettroniche popular all’alba del terzo millennio
A polarization census of bright pulsars using the Ultra-Wideband Receiver on the Parkes radio telescope
Creators: name: Sobey, C.
name: Johnston, S.
name: Dai, S.
name: Kerr, M.
name: Manchester, R. N.
name: Oswald, L. S.
name: Parthasarathy, A.
name: Shannon, R. M.
name: Weltevrede, P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present high signal-to-noise, full polarization pulse profiles for 40 bright, 'slowly'-rotating (non-recycled) pulsars using the new Ultra-Wideband Low-frequency (UWL; 704-4032 MHz) receiver on the Parkes radio telescope. We obtain updated and accurate interstellar medium parameters towards these pulsars (dispersion measures and Faraday rotation measures), and reveal Faraday dispersion towards PSR J1721-3532 caused by interstellar scattering. We find general trends in the pulse profiles including decreasing fractional linear polarization and increasing degree of circular polarization with increasing frequency, consistent with previous studies, while also revealing new features and frequency evolution. This demonstrates results that can be obtained using UWL monitoring observations of slow pulsars, which are valuable for improving our understanding of pulsar emission and the intervening interstellar medium. The calibrated data products are publicly available.
description: 20 pages, 5 figures, 2 tables, 25 pages of supporting information with 2 figures. Accepted for publication in MNRAS. doi:10.1093/mnras/stab861
Ricordo di Giulio Cattin
Creators: name: Baroffio, Giacomo
Publisher: name: Pavia University Press - Edizioni dell'Università degli Studi di Pavia
Year: 2014

description: Philomusica on-line, Vol 13, N° 2 (2014): Just for Dancing? Studi italiani sulle musiche elettroniche popular all’alba del terzo millennio
Model Predictive Actor-Critic: Accelerating Robot Skill Acquisition with Deep Reinforcement Learning
Creators: name: Morgan, Andrew S.
name: Nandha, Daljeet
name: Chalvatzaki, Georgia
name: D'Eramo, Carlo
name: Dollar, Aaron M.
name: Peters, Jan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Substantial advancements to model-based reinforcement learning algorithms have been impeded by the model-bias induced by the collected data, which generally hurts performance. Meanwhile, their inherent sample efficiency warrants utility for most robot applications, limiting potential damage to the robot and its environment during training. Inspired by information theoretic model predictive control and advances in deep reinforcement learning, we introduce Model Predictive Actor-Critic (MoPAC), a hybrid model-based/model-free method that combines model predictive rollouts with policy optimization as to mitigate model bias. MoPAC leverages optimal trajectories to guide policy learning, but explores via its model-free method, allowing the algorithm to learn more expressive dynamics models. This combination guarantees optimal skill learning up to an approximation error and reduces necessary physical interaction with the environment, making it suitable for real-robot training. We provide extensive results showcasing how our proposed method generally outperforms current state-of-the-art and conclude by evaluating MoPAC for learning on a physical robotic hand performing valve rotation and finger gaiting--a task that requires grasping, manipulation, and then regrasping of an object.
description: IEEE International Conference on Robotics and Automation (ICRA), Xi'an, China, 2021
A Proof of a Non-Commutative Central Limit Theorem by the Lindeberg Method
Creators: name: Kargin, Vladislav
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46L54, 60FL5

description: A Central Limit Theorem for non-commutative random variables is proved using the Lindeberg method. The theorem is a generalization of the Central Limit Theorem for free random variables proved by Voiculescu. The Central Limit Theorem in this paper relies on an assumption which is weaker than freeness.
description: 14 pages
Review of Eileen M. Hayes. 2010. Songs in Black and Lavender: Race, Sexual Politics, and Women’s Music. Urbana and Chicago: University of Illinois Press
Creators: name: Burrell, Jalylah
Publisher: name: Current Musicology
Year: 2010

description: Eileen M. Hayes’s ethnographic study of women’s music festivals includes this simple testimony from African-American, festival-circuit stalwart Mary Watkins: “A triad is a triad” (54). The pianist and composer was intervening on the tendency to tether “musical structure” to “gender identity” in appraisals of the women’s music festival circuit: a loose network of festivals that emerged in the mid-seventies (54). The festival circuit was produced by and primarily for lesbian women, many of who evinced strong feminist sensibilities. Contemporary women’s music festivals are the sites for Hayes’s escorted road trip in Songs and Black and Lavender: Race, Sexual Politics and Women’s Music.
description: Current Musicology, No 89 (2010): Current Musicology
The Effects of Neuregulin on Synapse Formation in Primary Muscle/Nerve Co-Cultures
Creators: name: Walsh, Jessica
name: Mann, Mary A
name: Fischbach, Gerald
Publisher: name: Columbia Undergraduate Science Journal
Year: 2007

description: In development, motor neurons innervate maturing myotubes to form the neuromuscular junction (NMJ). During this process, the nerve terminal secretes a protein called neuregulin (NRG1). NRG1 acts as a signal which increases the number of acetylcholine receptors (AChRs) on the postsynaptic membrane. NRG1 binds to receptors on the surface of the muscle, known as erbB receptors. The binding of NRG1 causes the erbB receptor to auto-phosphorylate (Fu, 1999). As a result, there is an increase in transcription of the gene for AchRs, integral membrane proteins that respond to the binding of the neurotransmitter acetylcholine. In order to study the effects of NRG1 on early stages of synapse formation, we prepared co-cultures of dissociated muscle cells from postnatal day 1 (P1) mice and neural tube explants from embryonic day 11 (E11) mice. Silicone chambers were created as a system for growing dissociated muscle cells and neuronal explants in co-culture (Loeb, 1999). ErbB inhibitor (PD 158780) was added to chambers prior to the formation of the NMJ. After one week the tissue was fixed and stained to visualize the synapses. Based on the results of two experiments, the chambers that were not treated with the inhibitor had an average of 10 times more AchR (+) contacts. Therefore, at the time point studied, it appears that NRG1 signaling through the erbB receptor tyrosine kinases is necessary for the formation of AchR (+) receptor contacts at the motor terminal in the post-synaptic membrane.
description: Columbia Undergraduate Science Journal, Vol 2 (2007): Spring 2007
Ionisation-induced star formation I: The collect and collapse model
Creators: name: Dale, J. E.
name: Bonnell, I. A.
name: Whitworth, A. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We conduct Smoothed Particle Hydrodynamics simulations of the `collect and collapse' scenario (Elmegreen and Lada, 1977) for star formation triggered by an expanding HII region. We simulate the evolution of a spherical uniform molecular cloud with an ionising source at its centre. The gas in the cloud is self-gravitating, although the cloud is prevented from globally collapsing. We find that the shell driven by the HII region fragments to form numerous self--gravitating objects. We repeat our calculations at four numerical resolutions to ensure that they are converged. We compare our results to the analytical model of Whitworth et al, 1994 and show that our simulations and the predictions of Whitworth et al are in good agreement in the sense that the shell fragments at the time and radius predicted by Whitworth et al to within 20% and 25% respectively. Most of the fragments produced in our two highest resolution calculations are approximately half the mass of those predicted, but this conclusion is robust against both numerical resolution and the presence of random noise (local fluctuations in density of a factor of $\sim2$) in the initial gas distribution. We conclude that such noise has little impact on the fragmentation process.
description: laTeX, 9 pages, 8 figures, accepted by MNRAS
A model-independent framework for determining finite-volume effects of spatially nonlocal operators
Creators: name: Briceño, Raúl A.
name: Monahan, Christopher J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We present a model-independent framework to determine finite-volume corrections of matrix elements of spatially-separated current-current operators. We define these matrix elements in terms of Compton-like amplitudes, i.e. amplitudes coupling single-particle states via two current insertions. We show that the infrared behavior of these matrix elements is dominated by the single-particle pole, which is approximated by the elastic form factors of the lowest-lying hadron. Therefore, given lattice data on the relevant elastic form factors, the finite-volume effects can be estimated non-perturbatively and without recourse to effective field theories. For illustration purposes, we investigate the implications of the proposed formalism for a class of scalar theories in two and four dimensions.
description: 15 pages, 5 figures
Bose-Fermi Mixtures in a Three-dimensional Optical Lattice
Creators: name: Günter, Kenneth
name: Stöferle, Thilo
name: Moritz, Henning
name: Köhl, Michael
name: Esslinger, Tilman
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have studied mixtures of fermionic $^{40}$K and bosonic $^{87}$Rb quantum gases in a three-dimensional optical lattice. We observe that an increasing admixture of the fermionic species diminishes the phase coherence of the bosonic atoms as measured by studying both the visibility of the matter wave interference pattern and the coherence length of the bosons. Moreover, we find that the attractive interactions between bosons and fermions lead to an increase of the boson density in the lattice which we measure by studying three-body recombination in the lattice. In our data we do not observe three-body loss of the fermionic atoms. An analysis of the thermodynamics of a noninteracting Bose-Fermi mixture in the lattice suggests a mechanism for sympathetic cooling of the fermions in the lattice.
Sensory Substitution : Perception Dedicated to Action
Creators: name: Hardy, Bianca
name: Ramanantsoa, Marie-Martine
name: Hanneton, Sylvain
name: Lenay, Charles
name: Gapenne, Olivier
name: Marque, Catherine K
Publisher: name: arXiv
Year: 2007
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: Paul Bach Y Rita [1] is the precursor of sensory substitutions. He started thirty years ago using visuo-tactile prostheses with the intent of satisfying blind people. These prostheses, called Tactile Vision Substitution Systems (TVSS), transform a sensory input from a given modality (vision) into another modality (touch). These new systems seemed to induce quasi-visual perceptions. One of the author's interests dealt with the understanding of the coupling between actions and sensations in perception mechanisms [4]. Throughout his search, he noticed that the subjects had to move the camera themselves in order to recognise a 3D target-object or a figure placed in front of them. Our work consists in understanding how sensory information provided by a visuo-tactile prosthesis can be used for motor behaviour. In this aim, we used the most simple substitution device (one photoreceptor coupled with one tactile stimulator) in order to control and enrich our knowledge of the ties between perception and action.
description: Pages 52-55
DCcov: Repositioning of Drugs and Drug Combinations for SARS-CoV-2 Infected Lung through Constraint-Based Modelling
Creators: name: Kishk, Ali
name: Pacheco, Maria Pires
name: Sauter, Thomas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Molecular Networks (q-bio.MN)
subject: Genomics (q-bio.GN)
subject: FOS: Biological sciences

description: The 2019 coronavirus disease (COVID-19) became a worldwide pandemic with currently no effective antiviral drug except treatments for symptomatic therapy. Flux balance analysis is an efficient method to analyze metabolic networks. It allows optimizing for a metabolic function and thus e.g., predicting the growth rate of a specific cell or the production rate of a metabolite of interest. Here flux balance analysis was applied on human lung cells infected with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) to reposition metabolic drugs and drug combinations against the replication of the SARS-CoV-2 virus within the host tissue. Making use of expression data sets of infected lung tissue, genome-scale COVID-19-specific metabolic models were reconstructed. Then host-specific essential genes and gene-pairs were determined through in-silico knockouts that permit reducing the viral biomass production without affecting the host biomass. Key pathways that are associated with COVID-19 severity in lung tissue are related to oxidative stress, as well as ferroptosis, sphingolipid metabolism, cysteine metabolism, and fat digestion. By in-silico screening of FDA approved drugs on the putative disease-specific essential genes and gene-pairs, 45 drugs and 99 drug combinations were predicted as promising candidates for COVID-19 focused drug repositioning (https://github.com/sysbiolux/DCcov). Among the 45 drug candidates, six antiviral drugs were found and seven drugs that are being tested in clinical trials against COVID-19. Other drugs like gemcitabine, rosuvastatin and acetylcysteine, and drug combinations like azathioprine-pemetrexed might offer new chances for treating COVID-19.
Review of Tricia Rose. 2008. The Hip Hop Wars: What We Talk About When We Talk About Hip Hop-And Why It Matters. New York: Basic/Civitas Books
Creators: name: Bothwell, Beau
Publisher: name: Current Musicology
Year: 2010

description: As hip hop slowly settles into middle age, the pitched battles of its younger years have frozen in a stalemate. Critics of hip hop repeat the same attacks they leveled at NWA, decrying violence, misogyny, and homophobia in hiphop lyrics, and in the most extreme cases branding its creators as Typhoid Marys for a particularly virulent social pathology. Defenders respond with rebuttals codified in the early 1990s, lauding the aesthetic value and social relevance of their favorite corners of the hip-hop world, eliding any problems inherent in the rest, and questioning the true motives of hip hop’s critics. As Tricia Rose tells it, these arguments have remained essentially static, even as hip hop experienced two remarkable-though opposing-developments.
description: Current Musicology, No 89 (2010): Current Musicology
Absolute Branching Fractions of Cabibbo-Suppressed D --> K Kbar Decays
Creators: name: CLEO Collaboration
name: Bonvicini, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Using 281/pb of data collected with the CLEO-c detector at the psi(3770) resonance, we have studied Cabibbo-suppressed decays of D mesons to final states with two kaons. We present results for the absolute branching fractions of the modes D^0 --> K^+ K^-, D^0 --> K^0_S K^0_S, and D^+ --> K^+ K^0_S. We measure B(D^0 --> K^+ K^-) = (4.08 +- 0.08 +- 0.09) x 10^-3, B(D^0 --> K^0_S K^0_S) = (1.46 +- 0.32 +- 0.09) x 10^-4, and B(D^+ --> K^+ K^0_S) = (3.14 +- 0.09 +- 0.08) x 10^-3. We also determine the ratio B(D^0 --> K^+ K^-)/B(D^0 --> pi^+ pi^-) = 2.89 +- 0.05 +- 0.06. For each measurement, the first uncertainty is statistical and the second uncertainty is systematic.
description: 7 pages, 3 figures, available through http://www.lns.cornell.edu/public/CLNS/, published in PRD Rapid Communications
Is OJ 287 a Single Supermassive Black Hole?
Creators: name: Butuzova, M. S.
name: Pushkarev, A. B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Light curves for more than century optical photometric observations of the blazar OJ 287 reveals strong flares with a quasi-period of about 12 years. For a long time, this period has been interpreted by processes in a binary black hole system. We propose an alternative explanation for this period, which is based on Doppler factor periodic variations of the emitting region caused by jet helicity. Using multi-epoch very large baseline interferometry (VLBI) observations carried out in a framework of the MOJAVE (Monitoring Of Jets in Active galactic nuclei with VLBA Experiments) program and other VLBA (Very Long Baseline Array) archival experiments at the observing frequency of 15 GHz, we derived geometrical parameters of the jet helix. To reach an agreement between the VLBI and photometric optical observation data, the jet component motion at a small angle to the radial direction is necessary. Such non-radial motion is observed and, together with the jet helical shape, can be naturally explained by the development of the Kelvin-Helmholtz instability in the parsec-scale outflow. In this case, the true precession of the OJ 287 jet may manifest itself in differences between the peak flux values of the 12-year optical flares. A possibility to create this precession due to Lense-Thirring effect of a single supermassive black hole is also discussed.
description: 21 pages, 12 figures, 3 tables
Prospective and Retrospective Metacognitive Abilities in Rhesus Monkeys
Creators: name: Ding, Jennifer
name: Kornblum, Tamar
name: Kornell, Nate
name: Terrace, Herbert S
Publisher: name: Columbia Undergraduate Science Journal
Year: 2007

description: Metacognition refers to a knowledge of one’s own cognitive abilities and one’s aptitude to alter these abilities if necessary. Previous research from our lab shows that monkeys exhibit metacognitive abilities by accurately judging their own performance on perceptual and serial working memory tasks. The present study includes two phases during which a monkey makes retrospective and prospective judgments of confidence. In the retrospective phase of this experiment, the subject completes a recall task, and then judges his performance on the test phase by choosing from high and low-risk confidence choices. In the prospective task, the monkey makes his confidence judgment before the test, instead judging how well he learned during the study phase. An analysis of results indicates that monkeys can immediately transfer the ability to make metacognitive judgments from the serial working memory tasks in previous experiments to retrospective and prospective recall tasks in the present study. These findings underline the similarity between the non-human primate and human abilities to make confidence judgments. Further, they are the first evidence to date of a non-human primate making a prospective judgment of future performance, suggesting that the ability to use a metacognitive state to control one’s actions is not uniquely human.
description: Columbia Undergraduate Science Journal, Vol 2 (2007): Spring 2007
Weak compressibility of surface wave turbulence
Creators: name: Vucelja, M.
name: Fouxon, I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: We study the growth of small-scale inhomogeneities of the density of particles floating in weakly nonlinear, small-amplitude, surface waves. Despite the amplitude smallness, the accumulated effect of the long-time evolution may produce strongly inhomogeneous distribution of the floaters: density fluctuations grow exponentially with a small but finite exponent. We show that the exponent is of sixth or higher order in wave amplitude. As a result, the inhomogeneities do not form within typical time-scales of the natural environment. We conclude that turbulence of surface waves is weakly compressible and alone it cannot be a realistic mechanism of the clustering of matter on liquid surfaces.
The forward-backward asymmetry at NNLO revisited
Creators: name: Weinzierl, Stefan
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: I reconsider the forward-backward asymmetry for flavoured quarks in electron-positron annihilation. I suggest an infrared-safe definition of this observable, such that the asymmetry may be computed in perturbative QCD with massless quarks. With this definition, the first and second order QCD corrections are computed.
description: 10 pages, version to be published
Ore reserve estimation, Silver Queen vein, Owen Lake, British Columbia
Creators: name: Nowak, Marek Stanislaw
Publisher: name: University of British Columbia
Year: 2010

description: The Silver Queen polymetallic vein system south of Houston, B.C., can be treated as a 2-dimensional problem for purposes of reserve/resource estimation. Complexities in obtaining reserve/resource estimates arise from (i) uncertainties in geological interpolation and extrapolation of the vein system, (ii) uncertainties in the distinction between vein and highly altered wallrock in some old drill logs, (iii) complex and multivariable geological character of the vein, (iv) a limited number of exploration drill holes and (v) a different support for drift and drill hole data. Each of these problems has been considered in detail. The study comprises geological analysis, data analysis, point kriging (analysis of thickness and metal distribution) block kriging and comparison of reserve/resource estimation by various procedures including ordinary kriging, inverse squared distance weighting, and polygonal methods. A novel component of the investigation is the use of correlograms (in reality, 1 minus the correlogram) as a substitute for the variogram in geostatistical estimates. This procedure was tested as a means of defining continuity of DDH and Drift assay data of differing support. Ordinary kriging of large polygonal blocks provides metal contents more or less comparable to but locally more conservative than polygonal results reported in a recent feasibility study. Differences are in part due to the use of somewhat different data for the two procedures. The effect of the volume of the selective mining unit on the recovered tonnage and grade is described and limitations of the indirect lognormal method are presented.
Symmetries and conservation laws in the Gunther k-symplectic formalism of field theory
Creators: name: Román-Roy, Narciso
name: Salgado, Modesto
name: Vilariño, Silvia
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 70S05, 70S10, 53D05

description: This paper is devoted to studying symmetries of k-symplectic Hamiltonian and Lagrangian first-order classical field theories. In particular, we define symmetries and Cartan symmetries and study the problem of associating conservation laws to these symmetries, stating and proving Noether's theorem in different situations for the Hamiltonian and Lagrangian cases. We also characterize equivalent Lagrangians, which lead to an introduction of Lagrangian gauge symmetries, as well as analyzing their relation with Cartan symmetries.
description: 29 pages
Expanded boundary integral method and chaotic time-reversal doublets in quantum billiards
Creators: name: Veble, Gregor
name: Prosen, Tomaz
name: Robnik, Marko
Publisher: name: arXiv
Year: 2006
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We present the expanded boundary integral method for solving the planar Helmholtz problem, which combines the ideas of the boundary integral method and the scaling method and is applicable to arbitrary shapes. We apply the method to a chaotic billiard with unidirectional transport, where we demonstrate existence of doublets of chaotic eigenstates, which are quasi-degenerate due to time-reversal symmetry, and a very particular level spacing distribution that attains a chaotic Shnirelman peak at short energy ranges and exhibits GUE-like statistics for large energy ranges. We show that, as a consequence of such particular level statistics or algebraic tunneling between disjoint chaotic components connected by time-reversal operation, the system exhibits quantum current reversals.
description: 18 pages, 8 figures, with 3 additional GIF animations available at http://chaos.fiz.uni-lj.si/~veble/boundary/
The Renormalization Group Studies on Four Fermion Interaction Instabilities on Algebraic Spin Liquids
Creators: name: Xu, Cenke
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study the instabilities caused by four fermion interactions on algebraic spin liquids. Renormalization group (RG) is used for three types of previously proposed spin liquids on the square lattice: the staggered flux state of SU(2) spin system, the $π-$flux state of SU(4) spin system, and the $π-$flux state of SU(2) spin system. The low energy field theories of the first two types of spin liquids are QED3 with emerged SU(4) and SU(8) flavor symmetries, the low energy theory of the $π-$flux SU(2) spin liquid is the QCD3 with SU(2) gauge field and emergent Sp(4) (SO(5)) flavor symmetry. Suitable large-N generalization of these spin liquids are discussed, and a systematic 1/N expansion is applied to the RG calculations. The most relevant four fermion perturbations are identified, and the possible phases driven by relevant perturbations are discussed.
description: 14 pages, 5 figures
Measuring the Reward Value of Aspartame-Sweetened Yogurt Shake via Continuous and Progressive Ratio Schedules in Humans
Creators: name: Gondek-Brown, Madeleine
name: Sclafani, Anthony
name: McNally, Sarah
name: Gordon, Rebecca
name: Farkas, Jonathan
name: Torres, Mindy
name: Kissileff, Harry
Publisher: name: Columbia Undergraduate Science Journal
Year: 2007

description: The purpose of this study was to develop a methodology for measuring the reward value of food. Potentially, this methodology may help determine why people tend to regain weight after stopping a diet program. Human subjects were given aspartame-sweetened yogurt shake and non-sweet yogurt shake on continuous, or uninhibited, and progressive ratio, or inhibited for increasing intervals, schedules. It was expected that subjects would consume more of the sweet than non-sweet shake on each schedule, and that the progressive ratio schedule would amplify the difference between intake of sweet and non-sweet shake. For males and females together, intake measured reward value only on the continuous schedule. Also, males consumed significantly higher quantities of both sweet and non-sweet shake than females on the continuous schedule, indicating that males may consume markedly more than females only when the food is easily obtained. A second variable, post-meal palatability rating on a nine-point scale, measured reward value for both sexes together on the continuous schedule, and for females, also on the progressive ratio schedule. This variable predicted intake in females, suggesting that females place more emphasis on taste in determining intake than do males. On the continuous schedule, a one-point increase on the nine-point palatability scale corresponded to a 100 gram intake increase. Ultimately, the study showed that when there is no obstacle to obtaining the reinforcer, intake and post-meal palatability rating on a nine-point scale predict reward value, and that males and females stress different factors in deciding how much to consume.
description: Columbia Undergraduate Science Journal, Vol 2 (2007): Spring 2007
Heating of a trapped ion induced by dielectric materials
Creators: name: Teller, Markus
name: Fioretto, Dario A.
name: Holz, Philip C.
name: Schindler, Philipp
name: Messerer, Viktor
name: Schüppert, Klemens
name: Zou, Yueyang
name: Blatt, Rainer
name: Chiaverini, John
name: Sage, Jeremy
name: Northup, Tracy E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Electric-field noise due to surfaces disturbs the motion of nearby trapped ions, compromising the fidelity of gate operations that are the basis for quantum computing algorithms. We present a method that predicts the effect of dielectric materials on the ion's motion. Such dielectrics are integral components of ion traps. Quantitative agreement is found between a model with no free parameters and measurements of a trapped ion in proximity to dielectric mirrors. We expect that this approach can be used to optimize the design of ion-trap-based quantum computers and network nodes.
Magnetic field dissipation in neutron star crusts: from magnetars to isolated neutron stars
Creators: name: Pons, J. A.
name: Geppert, U.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the non--linear evolution of magnetic fields in neutron star crusts with special attention to the influence of the Hall drift. Our goal is to understand the conditions for fast dissipation due to the Hall term in the induction equation. We study the interplay of Ohmic dissipation and Hall drift in order to find a timescale for the overall crustal field decay. We solve numerically the Hall induction equation by means of a hybrid method (spectral in angles but finite differences in the radial coordinate). The microphysical input consists of the most modern available crustal equation of state, composition and electrical conductivities. We present the first long term simulations of the non--linear magnetic field evolution in realistic neutron star crusts with a stratified electron number density and temperature dependent conductivity. We show that Hall drift influenced Ohmic dissipation takes place in neutron star crusts on a timescale of 1 Myr. When the initial magnetic field has magnetar strength, the fast Hall drift results in an initial rapid dissipation stage that lasts 10-50 kyr. The interplay of the Hall drift with the temporal variation and spatial gradient of conductivity tends to favor the displacement of toroidal fields toward the inner crust, where stable configurations can last for 1 Myr. We show that the thermally emitting isolated neutron stars, as the Magnificent Seven, are very likely descendants of neutron stars born as magnetars.
description: 14 pages, 10 figures
z-anonymity: Zero-Delay Anonymization for Data Streams
Creators: name: Jha, Nikhil
name: Favale, Thomas
name: Vassio, Luca
name: Trevisan, Martino
name: Mellia, Marco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: With the advent of big data and the birth of the data markets that sell personal information, individuals' privacy is of utmost importance. The classical response is anonymization, i.e., sanitizing the information that can directly or indirectly allow users' re-identification. The most popular solution in the literature is the k-anonymity. However, it is hard to achieve k-anonymity on a continuous stream of data, as well as when the number of dimensions becomes high.In this paper, we propose a novel anonymization property called z-anonymity. Differently from k-anonymity, it can be achieved with zero-delay on data streams and it is well suited for high dimensional data. The idea at the base of z-anonymity is to release an attribute (an atomic information) about a user only if at least z - 1 other users have presented the same attribute in a past time window. z-anonymity is weaker than k-anonymity since it does not work on the combinations of attributes, but treats them individually. In this paper, we present a probabilistic framework to map the z-anonymity into the k-anonymity property. Our results show that a proper choice of the z-anonymity parameters allows the data curator to likely obtain a k-anonymized dataset, with a precisely measurable probability. We also evaluate a real use case, in which we consider the website visits of a population of users and show that z-anonymity can work in practice for obtaining the k-anonymity too.
Review of Patrick Burke. 2008. Come In And Hear The Truth: Jazz and Race on 52nd Street. Chicago and London: University of Chicago Press.
Creators: name: Coleman, Kwami
Publisher: name: Current Musicology
Year: 2010

description: In today's Manhattan, the street signs on Fifty-second Street between Fifth and Seventh Avenues tell passersby that they are on "Swing Street;' even though nothing about the towering skyscrapers and the moving mass of people in business suits reflect this locale. Instead, what the street signs point to is a Fifty-second Street of the past: a collection of nightclubs and other establishments that jazz critics and scholars have designated as the birthplace of bebop, one of jazz's paradigm-shifting genres.
description: Current Musicology, No 89 (2010): Current Musicology
Dose distribution in water for monoenergetic photon point sources in the energy range of interest in brachytherapy: Monte Carlo simulations with PENELOPE and GEANT4
Creators: name: Almansa, Julio F.
name: Guerrero, Rafael
name: Al-Dweri, Feras M. O.
name: Anguiano, M.
name: Lallena, A. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Monte Carlo calculations using the codes PENELOPE and GEANT4 have been performed to characterize the dosimetric properties of monoenergetic photon point sources in water. The dose rate in water has been calculated for energies of interest in brachytherapy, ranging between 10 keV and 2 MeV. A comparison of the results obtained using the two codes with the available data calculated with other Monte Carlo codes is carried out. A chi2-like statistical test is proposed for these comparisons. PENELOPE and GEANT4 show a reasonable agreement for all energies analyzed and distances to the source larger than 1 cm. Significant differences are found at distances from the source up to 1 cm. A similar situation occurs between PENELOPE and EGS4.
description: 9 pages, 4 figures. Accepted for publication in Radiation Physics and Chemistry
Dictionary creation year 3
Creators: name: Beier, Christine
name: Farmer, Stephanie
name: Finley, Greg
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2016
Subjects: subject: ore
subject: Máíhĩ̵̀kì language

description: All documents associated with the creation of the Máíhĩ̵̀kì dictionary, typeset by Farmer using a script created by Finley, with front matter written by Beier.
Analisi ed esecuzione: note sulla teoria dell’interpretazione musicale di Theodor W. Adorno e Rudolf Kolisch
Creators: name: Borio, Gianmario
Publisher: name: Pavia University Press - Edizioni dell'Università degli Studi di Pavia
Year: 2003

description: Analisi ed esecuzione: note sulla teoria dell’interpretazione musicale di Theodor W. Adorno e Rudolf Kolisch.
description: Philomusica on-line, Vol 2, N° 1 (2003): Annata 2002-2003
Multiple self-organized phases and spatial solitons in cold atoms mediated by optical feedback
Creators: name: Baio, Giuseppe
name: Robb, Gordon R. M.
name: Yao, Alison M.
name: Oppo, Gian-Luca
name: Ackemann, Thorsten
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We study the transverse self-structuring of a cloud of cold atoms with effective atomic interactions mediated by a coherent driving beam retro-reflected by means of a single mirror. The resulting self-structuring due to optomechanical forces is much richer than that of an effective-Kerr medium, displaying hexagonal, stripe and honeycomb phases depending on the interaction strength parametrized by the linear susceptibility. Phase domains are described by real Ginzburg-Landau amplitude equations. In the stripe phase the system recovers inversion symmetry. Moreover, the subcritical character of the honeycomb phase allows for light-density feedback solitons functioning as self-sustained dark atomic traps with motion controlled by phase gradients in the driving beam.
description: 6 pages, 6 figures
Robust Gapless Superconductivity in 4Hb-TaS$_2$
Creators: name: Dentelski, David
name: Day-Roberts, Ezra
name: Birol, Turan
name: Fernandes, Rafael M.
name: Ruhman, Jonathan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The superconducting TMD 4Hb-TaS$_2$ consists of alternating layers of H and T structures, which in their bulk form are metallic and Mott-insulating, respectively. Recently, this compound has been proposed as a candidate chiral superconductor, due to an observed enhancement of the muon spin relaxation at $T_c$. 4Hb-TaS$_2$ also exhibits a puzzling $T$-linear specific heat at low temperatures, which is unlikely to be caused by disorder. Elucidating the origin of this behavior is an essential step in discerning the true nature of the superconducting ground state. Here, we propose a simple model that attributes the $T$-linear specific heat to the emergence of a robust multi-band gapless superconducting state. We show that an extended regime of gapless superconductivity naturally appears when the pair-breaking scattering rate on distinct Fermi-surface pockets differs significantly, and the pairing interaction is predominantly intra-pocket. Using a tight-binding model derived from first-principle calculations, we show that the pair-breaking scattering rate promoted by slow magnetic fluctuations on the T layers, which arise from proximity to a Mott transition, can be significantly different in the various H-layer dominated Fermi pockets depending on their hybridization with T-layer states. Thus, our results suggest that the ground state of 4Hb-TaS$_2$ consists of Fermi pockets displaying gapless superconductivity, which are shunted by superconducting Fermi pockets that are nearly decoupled from the T-layers.
description: 15 pages, 5 figures, two appendices