cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Measuring the linear and nonlinear elastic properties of brain tissue with shear waves and inverse analysis
Creators: name: Jiang, Yi
name: Li, Guoyang
name: Qian, Lin-Xue
name: Liang, Si
name: Destrade, Michel
name: Cao, Yanping
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We use supersonic shear wave imaging (SSI) technique to measure not only the linear but also the nonlinear elastic properties of brain matter. Here, we tested six porcine brains ex vivo and measured the velocities of the plane shear waves induced by acoustic radiation force at different states of pre-deformation when the ultrasonic probe is pushed into the soft tissue. We relied on an inverse method based on the theory governing the propagation of small-amplitude acoustic waves in deformed solids to interpret the experimental data. We found that, depending on the subjects, the resulting initial shear modulus mu0 varies from 1.8 to 3.2 kPa, the stiffening parameter b of the hyperelastic Demiray-Fung model from 0.13 to 0.73, and the third- (A) and fourth-order (D) constants of weakly nonlinear elasticity from -1.3 to -20.6 kPa and from 3.1 to 8.7 kPa, respectively. Paired t-test performed on the experimental results of the left and right lobes of the brain shows no significant difference. These values are in line with those reported in the literature on brain tissue, indicating that the SSI method, combined to the inverse analysis, is an efficient and powerful tool for the mechanical characterization of brain tissue, which is of great importance for computer simulation of traumatic brain injury and virtual neurosurgery.
Effects of chemical pressure on the Fermi surface and band dispersion in the electron-doped high-Tc superconductors
Creators: name: Ikeda, M.
name: Yoshida, T.
name: Fujimori, A.
name: Kubota, M.
name: Ono, K.
name: Das, Hena
name: Saha-Dasgupta, T.
name: Unozawa, K.
name: Kaga, Y.
name: Sasagawa, T.
name: Takagi, H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We have performed angle-resolved photoemission spectroscopy (ARPES) measurements and first-principles electronic structure calculations on the electron-doped high-Tc superconductors Ln1.85Ce0.15CuO4 (Ln = Nd, Sm, and Eu). The observed Fermi surface and band dispersion show such changes that with decreasing ionic size of Ln3+, the curvature of the Fermi surface or -t'/t decreases, where t and t' are transfer integrals between the nearest-neighbor and next-nearestneighbor Cu sites, respectively. The increase of t with chemical pressure is found to be significant, which may explain the apparently inconsistent behavior seen in the hole-doped La2-xSrxCuO4 under epitaxial strain [M. Abrecht et al., Phys. Rev. Lett. 91, 057002 (2003)]. A gap due to the antiferromagnetism opens even in the nodal region for the Sm and Eu compounds, and the gap size increases in going from Ln = Sm to Eu.
description: 4 pages, 4 figures
Baroclinic Vorticity Production in Protoplanetary Disks; Part II: Vortex Growth and Longevity
Creators: name: Petersen, Mark R.
name: Stewart, Glen R.
name: Julien, Keith
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The factors affecting vortex growth in convectively stable protoplanetary disks are explored using numerical simulations of a two-dimensional anelastic-gas model which includes baroclinic vorticity production and radiative cooling. The baroclinic feedback, where anomalous temperature gradients produce vorticity through the baroclinic term and vortices then reinforce these temperature gradients, is found to be an important process in the rate of growth of vortices in the disk. Factors which strengthen the baroclinic feedback include fast radiative cooling, high thermal diffusion, and large radial temperature gradients in the background temperature. When the baroclinic feedback is sufficiently strong, anticyclonic vortices form from initial random perturbations and maintain their strength for the duration of the simulation, for over 600 orbital periods. Based on both simulations and a simple vortex model, we find that the local angular momentum transport due to a single vortex may be inward or outward, depending its orientation. The global angular momentum transport is highly variable in time, and is sometimes negative and sometimes positive. This result is for an anelastic gas model, and does not include shocks that could affect angular momentum transport in a compressible-gas disk.
description: Originally submitted to The Astrophysical Journal April 3, 2006; resubmitted November 3, 2006; accepted by The Astrophysical Journal Dec 5, 2006
Radio path length correction using water vapour radiometry
Creators: name: Sault, R. J.
name: Carrad, G. J.
name: Hall, P. J.
name: Crofts, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Path length changes through the atmosphere cause significant errors for astronomical radio interferometry at high frequencies (e.g. 100 GHz). Path length differences typically give rise to a differential excess path of 1mm for antennas separated by 1km, and have fluctuation time scales of greater than 10 seconds. To measure these fluctuations, we are building a four-channel radiometer centred on the 22 GHz water line. By sensing the water vapour emission, the excess path can be deduced and corrected. Multiple channels give us robustness against various systematic errors, but gain stability of the radiometer of 1 pair in 10^4 is still required.
description: 5 pages, 3 figures, Conference paper available at: http://www.ips.gov.au/IPSHosted/NCRS/wars/wars2000/commj/sault.pdf
A phenomenological study : The impact of neo-reichian bodywork on six clients
Creators: name: Llewellyn, Evan
Publisher: name: University of British Columbia
Year: 2009

description: This study deals with six clients' perceptions of change resulting from a single session of Neo-Reichian bodywork. A phenomenological approach is used consisting of two taped interviews and a Q-sort for each of the subjects. The Q-sort is based on emergent themes garnered from the first client interview. At a second interview subjects were presented with a written summary of their initial comments for corroboration and correction. Subjects then sorted theme cards according to each card's perceived importance in the process of change. The results indicate that cathartic release is a major component of this type of therapy and that it is experienced as being emotionally, extremely intense. The therapy appears to be a quick and effective means of addressing unresolved emotional trauma. In addition, there are concomitant effects of altered body experiences, increased acceptance of others and a renewed courage in confronting existential problems. Significant change is primarily associated with a connection to deep feelings in the therapeutic session and an enhanced attitude towards interpersonal problems. Participant perceptions and evaluations of the therapy did not alter appreciably from the first interviews held within two weeks after therapy to the second interviews five months later. The therapy is considered to have a large emotional component while cognitive understanding plays a less significant role. For this reason, the study suggests the use of Neo-Reichian bodywork in conjunction with other more cognitive modes of therapy.
Post-corona unipolar chargers with tuneable aerosol size-charge relations: Parameters affecting ion dispersion and particle trajectories for charger designs
Creators: name: Jidenko, N.
name: Bouarouri, A.
name: Gensdarmes, F.
name: Maro, D.
name: Boulaud, D.
name: Borra, J. -P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: This paper focusses on the mean charge per particle of monodisperse submicron aerosol, charged by diffusion of unipolar ions in post-corona discharge. It aims to confirm and discuss the limits of considering a single value of Ni$\times$t to describe aerosol charging and then to present methods to control the size-charge relation. Three aerosol chargers, with different mixings of ion and aerosol flows are investigated. Despite comparable ion sources with discharge currents of a few tens of $μ$A, the size-charge relations differs from one charger to another due to different ion-aerosol mixing conditions and subsequent ion density along particles trajectories. Discrepancies are even more noticeable as the particle size increases. Discharge current, velocities of ion and aerosol flows and electric field control post-discharge ion density in each point of the charging volume. The control of particle trajectory in expanding unipolar ion cloud, leads to tuneable size-charge relations. Aerosol inertia and charging dynamics, that both depends on particle size, affects the Ni$\times$t experienced by the particle and thus the final charge of the particle. Operating conditions to reach a constant mean charge for particles larger than 200 nm are reported. Conclusions provide a basis to design aerosol chargers devoted to electric mobility selection for aerosol deposition, separation or electrical measurements especially to overcome the limits of mobility-to-size data inversion due to multiple charge ambiguity using diffusion chargers.
Modified Sagnac experiment for measuring travel-time difference between counter-propagating light beams in a uniformly moving fiber
Creators: name: Wang, Ruyong
name: Zheng, Yi
name: Yao, Aiping
name: Langley, Dean
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: A fiber optic conveyor has been developed for investigating the travel-time difference between two counter-propagating light beams in uniformly moving fiber. Our finding is that there is a travel-time difference Deltat=2vDeltal/c^2 in a fiber segment of length Deltal moving with the source and detector at a speed v, whether the segment is moving uniformly or circularly.
description: 4 pages, including 4 figures
Guided waves in pre-stressed hyperelastic plates and tubes: Application to the ultrasound elastography of thin-walled soft materials
Creators: name: Li, Guo-Yang
name: He, Qiong
name: Mangan, Robert
name: Xu, Guoqiang
name: Mo, Chi
name: Luo, Jianwen
name: Destrade, Michel
name: Cao, Yanping
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: In vivo measurement of the mechanical properties of thin-walled soft tissues (e.g., mitral valve, artery and bladder) and in situ mechanical characterization of thin-walled artificial soft biomaterials in service are of great challenge and difficult to address via commonly used testing methods. Here we investigate the properties of guided waves generated by focused acoustic radiation force in immersed pre-stressed plates and tubes, and show that they can address this challenge. To this end, we carry out both (i) a theoretical analysis based on incremental wave motion in finite deformation theory and (ii) finite element simulations. Our analysis leads to a novel method based on the ultrasound elastography to image the elastic properties of pre-stressed thin-walled soft tissues and artificial soft materials in a non-destructive and non-invasive manner. To validate the theoretical and numerical solutions and demonstrate the usefulness of the corresponding method in practical measurements, we perform (iii) experiments on polyvinyl alcohol cryogel phantoms immersed in water, using the Verasonics V1 System equipped with a L10-5 transducer. Finally, potential clinical applications of the method have been discussed.
MPEC 2024-C98 : 2022 OT1
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Πρώτη εναντιοειδική ολική σύνθεση του φυσικού προϊόντος Potassium Aeshynomate
Creators: name: Ρίζος, Στέργιος Ρίζου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Ολική σύνθεση
Φυσικά Προϊόντα
Ασύμμετρη Σύνθεση
Natural Product
Total Synthesis
Asymmetric Synthesis
Potassium Aeshynomate

description: To Potassium aeshynomate (1) είναι ο παράγοντας που προκαλεί το άνοιγμα των φύλλων (LOF) στο ψυχανθές φυτό Aeschynomene indica L. στα πλαίσια της λειτουργίας της νυκτιναστίας. Σε αυτή την εργασία περιγράφεται μία κατάλληλη και αποτελεσματική στρατηγική για την ολική σύνθεση του καθαρού εναντιομερούς 1 από τη χειρόμορφη διόλη ent-6, η οποία προέρχεται από την L-αραβινόζη. Η πραγματοποιηθείσα σύνθεση περιλαμβάνει μία οξείδωση του προϊόντος σύζευξης και καθορίζει με ασφαλή τρόπο την απόλυτη απεικόνιση του επιθυμητού φυσικού προϊόντος 1, η οποία παρέμεινε άγνωστη έως σήμερα.
description: Potassium aeshynomate (1) is the leaf-opening factor of the nyctinastic plant Aeschynomene indica L. In this thesis a convenient and efficient strategy for the total synthesis of enantiomerically pure 1 is described, starting from the L-arabinose derived chiron ent-6. The realized synthetic scheme involves a postcoupling oxidation approach and securely determines the absolute configuration of the targeted natural product, which remained unknown until now.
Click Stream Cluster Analysis  -- Ταξινόμηση Δεδομένων Ροής Επιλογών Ιστοσελίδων
Creators: name: Koutsoupias, Nikos
Publisher: name: Zenodo
Year: 2023

description:  

Volume of Abstracts

4th Data Analysis Conference  - Greek Society of Data Analysis - Karditsa 2007

Click Stream Cluster AnalysisNikos KoutsoupiasUniversity of W. MacedomiaWeb portal visitor behavior is an important research field of web data mining. In thiswork Cluster Analysis is proposed as a tool for the discovery of groupings inside databased on web click-streams. Using a data set of ten thousand user traces on pagesclassified in ten news categories we aimed in investigating user visiting patterns inorder to understand and better serve the needs both of internet users and web-basedapplications.

Ταξινόμηση Δεδομένων Ροής Επιλογών ΙστοσελίδωνΝίκος ΚουτσουπιάςΠανεπιστήμιο Δυτ. ΜακεδονίαςΗ διερεύνηση της συμπεριφοράς επισκεπτών εμπορικών και μη δικτυακώνπροορισμών αποτελεί ένα από τα πιο σημαντικά αντικείμενα μελέτης της επιστήμηςεξόρισης δικτυακών δεδομένων. Στην παρούσα εργασία προτείνεται η χρήση τηςΙεραρχικής Ταξινόμησης για τη αναζήτηση ομάδων και σχηματισμών σε δεδομέναπου προέρχονται από «ροή επιλογής ιστοσελίδων» (click-stream). Χρησιμοποιώνταςδέκα χιλιάδες επιλογές επισκεπτών μιας δικτυακής πύλης ενημέρωσης, εξετάζουμετις συνήθειες τους σε δέκα κατηγορίες ειδήσεων με σκοπό την καλύτερη κατανόησηκαι εξυπηρέτηση των αναγκών δικτυακών χρηστών και εφαρμογών.

Τόμος Περιλήψεων - 4o Πανελλήνιο Συνέδριο Ανάλυσης Δεδομένων - Καρδίτσα 2007
Understanding interlaminar toughening of unidirectional CFRP laminates with carbon nanotube veils
Creators: name: Ou, Yunfu
name: González, Carlos
name: Vilatela, Juan José
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The introduction of nanostructured interlayers is one of the most promising strategies for interlaminar reinforcement in structural composites. In this work, we study the failure mechanism and interlayer microstructure of aerospace-grade structural composites reinforced with thin veils of carbon nanotube produced using an industrialised spinning process. Samples of unidirectional carbon fibre/epoxy matrix composites interleaved with different composition CNT veils were prepared using hot press method and tested for interlaminar fracture toughness (IFT), measured in Mode-I (opening) and Mode-II (in-plane shear), and for interlaminar shear strength (ILSS), evaluated by the short beam shear (SBS) test. The crack propagation mode could be directly determined through fractography analysis by electron microscopy and resin/CNT spatial discrimination by Raman spectroscopy, showing a clear correlation between interlaminar reinforcement and the balance between cohesive/adhesive failure mode at the interlayer region. Composites with full resin infiltration of the CNT veils give a large increase of Mode II IFT (88%) to 1500 J/m2 and a slight enhancement of apparent interlaminar shear strength (6.5%), but a decrease of Mode I IFT (-21%). The results help establish the role of interlayer infiltration, interlaminar crossings and formation of a carbon fibre bridgings, for interlaminar reinforcement with interleaves.
description: 27 pages, 10 figures, 1 table
A descriptive study of the experiences and meanings of an adult male survivor of child sexual abuse
Creators: name: Cameron, Malcolm Paul
Publisher: name: University of British Columbia
Year: 2009

description: This study explores the experiences and meanings of an adult male survivor of child sexual abuse. A case study approach in the form of an in-depth interview was utilized in an effort to examine one survivor's experiences and subjective interpretations in light of his childhood sexual victimization. It was found that the survivor elevated his experience of child sexual abuse to the degree that it negatively permeated all aspects of his life. Child sexual abuse was cited by the survivor as the antecedent to the development of specific problematic life themes. These themes included sexual identity confusion, homophobia, ambivalence toward men, estrangement from his father, unsatisfying relationships with women, fear of intimacy, and movement toward recovery. This study therefore examines the presenting data and includes a critical analysis.
Visibility of Black Hole Shadows in Low-luminosity AGN
Creators: name: Bronzwaer, Thomas
name: Davelaar, Jordy
name: Younsi, Ziri
name: Mościbrodzka, Monika
name: Olivares, Héctor
name: Mizuno, Yosuke
name: Vos, Jesse
name: Falcke, Heino
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Accreting black holes tend to display a characteristic dark central region called the black-hole shadow, which depends only on spacetime/observer geometry and which conveys information about the black hole's mass and spin. Conversely, the observed central brightness depression, or image shadow, additionally depends on the morphology of the emission region. In this paper, we investigate the astrophysical requirements for observing a meaningful black-hole shadow in GRMHD-based models of accreting black holes. In particular, we identify two processes by which the image shadow can differ from the black-hole shadow: evacuation of the innermost region of the accretion flow, which can render the image shadow larger than the black-hole shadow, and obscuration of the black-hole shadow by optically thick regions of the accretion flow, which can render the image shadow smaller than the black-hole shadow, or eliminate it altogether. We investigate in which models the image shadows of our models match their corresponding black-hole shadows, and in which models the two deviate from each other. We find that, given a compact and optically thin emission region, our models allow for measurement of the black-hole shadow size to an accuracy of 5%. We show that these conditions are generally met for all MAD simulations we considered, as well as some of the SANE simulations.
Improving nonstoquastic quantum annealing with spin-reversal transformations
Creators: name: Lykiardopoulou, Eleni Marina
name: Zucca, Alex
name: Scivier, Sam A.
name: Amin, Mohammad H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Nonstoquastic Hamiltonians are hard to simulate due to the sign problem in quantum Monte Carlo simulation. It is however unclear whether nonstoquasticity can lead to advantage in quantum annealing. Here we show that YY-interaction between the qubits makes the adiabatic path during quantum annealing, and therefore the performance, dependent on spin-reversal transformations. With the right choice of spin-reversal transformation, a nonstoquastic Hamiltonian with YY-interaction can outperform stoquastic Hamiltonians with similar parameters. We introduce an optimization protocol to determine the optimal transformation and discuss the effect of suboptimality.
Continuous and Discrete (Classical) Heisenberg Spin Chain Revised
Creators: name: Ragnisco, Orlando
name: Zullo, Federico
Publisher: name: arXiv
Year: 2007
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Most of the work done in the past on the integrability structure of the Classical Heisenberg Spin Chain (CHSC) has been devoted to studying the $su(2)$ case, both at the continuous and at the discrete level. In this paper we address the problem of constructing integrable generalized ''Spin Chains'' models, where the relevant field variable is represented by a $N\times N$ matrix whose eigenvalues are the $N^{th}$ roots of unity. To the best of our knowledge, such an extension has never been systematically pursued. In this paper, at first we obtain the continuous $N\times N$ generalization of the CHSC through the reduction technique for Poisson-Nijenhuis manifolds, and exhibit some explicit, and hopefully interesting, examples for $3\times 3$ and $4\times 4$ matrices; then, we discuss the much more difficult discrete case, where a few partial new results are derived and a conjecture is made for the general case.
description: This is a contribution to the Proc. of workshop on Geometric Aspects of Integrable Systems (July 17-19, 2006; Coimbra, Portugal), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
Canonical sampling through velocity-rescaling
Creators: name: Bussi, Giovanni
name: Donadio, Davide
name: Parrinello, Michele
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We present a new molecular dynamics algorithm for sampling the canonical distribution. In this approach the velocities of all the particles are rescaled by a properly chosen random factor. The algorithm is formally justified and it is shown that, in spite of its stochastic nature, a quantity can still be defined that remains constant during the evolution. In numerical applications this quantity can be used to measure the accuracy of the sampling. We illustrate the properties of this new method on Lennard-Jones and TIP4P water models in the solid and liquid phases. Its performance is excellent and largely independent on the thermostat parameter also with regard to the dynamic properties.
title: Adding Indaziflam as an Authorized Herbicide on the Sawtooth and Boise National Forests
titleType: AlternativeTitle
title: Endangered Species Act Section 7 Formal Consultation and Magnuson-Stevens Fishery Conservation and Management Act Essential Fish Habitat Consultation for Adding Indaziflam as an Authorized Herbicide on the Sawtooth and Boise National Forests; 17060201, 17060205, and 17060208; Custer, Valley, and Blaine Counties, Idaho
Creators: name: United States. National Marine Fisheries Service. West Coast Region
Publisher: name: United States. National Marine Fisheries Service. West Coast Region
Year: 2025

description: WCRO-2024-00864
Penguin pollution estimates relevant for phi_2/alpha extraction
Creators: name: Zupan, Jure
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A review of methods to extract the standard CKM unitarity triangle angle alpha is provided. The sizes of related theoretical errors are reviewed.
description: 6 pages, referencing improved, based on talks given at "CKM2006", Dec 12th-16th, 2006, Nagoya, Japan, and at "Beauty 2006", Sept 25th-29th 2006, Oxford, UK
Radio Monitoring of the Tidal Disruption Event Swift J164449.3+573451. IV. Continued Fading and Non-Relativistic Expansion
Creators: name: Cendes, Yvette
name: Eftekhari, Tarraneh
name: Berger, Edo
name: Polisensky, Emil
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present continued radio and X-ray observations of the previously relativistic tidal disruption event (TDE) Swift J164449.3+573451 (\sw) extending to about 9.4 years post disruption, as part of ongoing campaigns with the Jansky Very Large Array (VLA) and the \textit{Chandra} X-ray observatory. We find that the X-ray emission has faded below detectable levels, with an upper limit of $\lesssim 3.5\times 10^{-15}$ erg cm$^{-2}$ s$^{-1}$ in a 100 ks observation, while the radio emission continues to be detected and steadily fade. Both are consistent with forward shock emission from a non-relativistic outflow, although we find that the radio spectral energy distribution is better fit at these late times with an electron power law index of $p\approx 3$ (as opposed to $p\approx 2.5$ at earlier times). With the revised spectral index we find $ε_B\approx 0.01$ using the radio and X-ray data, and a density of $\approx 0.04$ cm$^{3}$ at a radius of $R\approx 0.65$ pc ($R_{\rm sch}\approx 2\times 10^6$ R$_\odot$) from the black hole. The energy scale of the blastwave is $\approx 10^{52}$ erg. We also report detections of \sw\ at 3 GHz from the first two epochs of the VLA Sky Survey (VLASS), and find that $\sim 10^2$ off-axis \sw-like events to $z\sim 0.5$ may be present in the VLASS data. Finally, we find that \sw\ itself will remain detectable for decades at radio frequencies, although observations at sub-GHz frequencies will become increasingly important to characterize its dynamical evolution.
description: Submitted to the Astrophysical Journal 10 pages, 7 figures
Exciting half-integer charges in a quantum point contact
Creators: name: Snyman, I.
name: Nazarov, Y. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study a voltage-driven quantum point contact (QPC) strongly coupled to a qubit. We predict pronounced observable features in the QPC current that can be interpreted in terms of half-integer charge transfers. Our analysis is based on the Keldysh generating functional approach and contains general results, valid for all coherent conductors.
description: 7 pages, 6 figures
Effect of short-ranged spatial correlations on the Anderson localization of phonons in mass-disordered systems
Creators: name: Mondal, Wasim Raja
name: Vidhyadhiraja, N. S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigate the effect of spatially correlated disorder on the Anderson transition of phonons in three dimensions using a Greens function based approach, namely, the typical medium dynamical cluster approximation (TMDCA), in mass-disordered systems. We numerically demonstrate that correlated disorder with pairwise correlations mitigates the localization of the vibrational modes. A correlation driven localization-delocalization transition can emerge in a three-dimensional disordered system with an increase in the strength of correlations.
Collisions of rigidly rotating disks of dust in General Relativity
Creators: name: Hennig, Jörg
name: Neugebauer, Gernot
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We discuss inelastic collisions of two rotating disks by using the conservation laws for baryonic mass and angular momentum. In particular, we formulate conditions for the formation of a new disk after the collision and calculate the total energy loss to obtain upper limits for the emitted gravitational energy.
description: 30 pages, 9 figures
Multi-Gluon Scattering in Open Superstring Theory
Creators: name: Stieberger, Stephan
name: Taylor, Tomasz R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Number Theory (math.NT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We discuss the amplitudes describing N-gluon scattering in type I superstring theory, on a disk world-sheet. After reviewing the general structure of amplitudes and the complications created by the presence of a large number of vertices at the boundary, we focus on the most promising case of maximally helicity violating (MHV) configurations because in this case, the zero Regge slope limit (alpha' -> 0) is particularly simple. We obtain the full-fledged MHV disk amplitudes for N=4,5 and N=6 gluons, expressed in terms of one, two and six functions of kinematic invariants, respectively. These functions represent certain boundary integrals - generalized Euler integrals - which for N>= 6 correspond to multiple hypergeometric series (generalized Kampe de Feriet functions). Their alpha'-expansions lead to Euler-Zagier sums. For arbitrary N, we show that the leading string corrections to the Yang-Mills amplitude, of order O(alpha'^2), originate from the well-known alpha'^2 Tr F^4 effective interactions of four gauge field strength tensors. By using iteration based on the soft gluon limit, we derive a simple formula valid to that order for arbitrary N. We argue that such a procedure can be extended to all orders in alpha'. If nature gracefully picked a sufficiently low string mass scale, our results would be important for studying string effects in multi-jet production at the Large Hadron Collider (LHC).
description: 34 pages, REVTeX, 2 figs
A comparison of the internal consistency, reliability and convergent validity of two response formats for the Beck hopelessness scale
Creators: name: Kotalis, Lee
Publisher: name: University of British Columbia
Year: 2009

description: The Beck Hopelessness Scale (BHS) is a 20-item true/false questionnaire designed to measure a respondent's negative expectancies about the future. The construct of hopelessness has been found to correlate strongly with suicidal and parasuicidal behavior, and the BHS i s frequently used in the assessment of suicide risk. The primary purpose of the current study was to explore the impact on the internal consistency reliability and convergent validity of the BHS, when the scale's item response format was altered from its published true/false format to a system of scoring each item on a 6-point Likert scale. The sample investigated was drawn from an adult non-clinical population. Results indicated that there was no significant difference in the magnitude of the internal consistency reliability coefficients obtained with each of the two response formats tested. Results also indicated that, when considering the total sample, there was no significant difference in the magnitude of correlations found between the true/false versus the 6-point Likert scored BHS and the convergent measures investigated in the study. However, two levels of sex differences were found: within each BHS type tested (true/false and 6-point Likert) higher magnitude correlations were found between BHS scores and all of the other measures investigated for female participants than for male participants (although the differences failed to reach statistical significance) in the true/false BHS condition, and higher magnitude correlations were found for male participants than for female participants (two of the differences were significant at the .05 level) in the 6-point Likert condition. Additionally, within each sex, male participants obtained higher correlations (non-significantly) in the 6-point Likert compared to the true/false BHS condition with all measures investigated, while female participants in the true/false BHS group obtained higher correlations with all of the measures investigated (one of the differences was significant at the .05 level) relative to female participants in the 6-point Likert group. A number of interpretations and implications of the findings are discussed.
Finite and Infinite Matrix Product States for Gutzwiller Projected Mean-Field Wavefunctions
Creators: name: Petrica, Gabriel
name: Zheng, Bo-Xiao
name: Chan, Garnet Kin-Lic
name: Clark, Bryan K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Matrix product states (MPS) and `dressed' ground states of quadratic mean fields (e.g. Gutzwiller projected Slater Determinants) are both important classes of variational wave-functions. This latter class has played important roles in understanding superconductivity and quantum spin-liquids. We present a novel method to obtain both the finite and infinite MPS (iMPS) representation of the ground state of an arbitrary fermionic quadratic mean-field Hamiltonian, (which in the simplest case is a Slater determinant and in the most general case is a Pfaffian). We also show how to represent products of such states (e.g. determinants times Pfaffians). From this representation one can project to single occupancy and evaluate the entanglement spectra after Gutzwiller projection. We then obtain the MPS and iMPS representation of Gutzwiller projected mean-field states that arise from the variational slave-fermion approach to the $S=1$ Bilinear-Biquadratic (BLBQ) quantum spin chain. To accomplish this, we develop an approach to orthogonalize degenerate iMPS to find all the states in the degenerate ground-state manifold. We find the energies of the MPS and iMPS states match the variational energies closely indicating the method is accurate and there is minimal loss due to truncation error. We then present the first exploration of the entanglement spectra of projected slave-fermion states exploring their qualitative features and finding good qualitative agreement with the respective exact ground state spectra found from DMRG.
nd_scatter Interactive Biplot
Creators: name: Watters, Aaron
Publisher: name: F1000 Research Limited
Year: 2019

description: Many systems biology studies derive datasets with hundreds or thousands of dimensions. For example micro-biome assays can produce relative abundance measurements for thousands of microorganisms and ATAC-seq (assay for accessible chromatin) or CHIP-seq (chromatin immuno precipitation) assays can produce gene accessibility and expression levels for hundreds of genes.

This poster presents the nd_scatter widget -- an interactive visualization extending methods developed in GGobi [1] for exploring and presenting multidimensional data using three dimensional projections. The widget allows the user to select components, examine and adjust the projection vectors for the data, and to apply common projection method such as 3 dimensional principal components analysis or t-distributed Stochastic Neighbor projections. Mouse interactions rotate, pan, and zoom the 3 dimensional projection of the features on the 3 dimensional display. Data points of interest may also be identified and examined using a lasso tool. The widget provides an interactive and configurable implementation of a type of biplot [2].

The nd_scatter widget is a stand alone Javascript component built using HTML 5 canvas technology. It is based on the jp_doodle package (https://github.com/AaronWatters/jp_doodle) and it is designed to be easily embedded as an interactive Jupyter widget using jp_proxy_widgets (https://github.com/AaronWatters/jp_proxy_widget). The Jupyter notebook embedding is useful for including the widget visualization in scientific workflows or other computational narratives. The widget published as part of an open source project and is currently under active development. It is similar to the tensor flow embeddings tool [5] but can be used in any Javascript/HTML5 context.
title: On the numerical properties of high‐order spectral (Euler‐Bernoulli) beam elements
Creators: name: Eisenträger, Sascha
name: Kapuria, Santosh
name: Jain, Mayank
name: Zhang, Junqi
Publisher: name: Wiley-VCH
Year: 2024

description: In this paper, the numerical properties of a recently developed high‐order Spectral Euler‐Bernoulli Beam Element (SBE) featuring a C¹‐continuous approximation of the displacement field are assessed. The C¹‐continuous shape functions are based on two main ingredients, which are an Hermitian interpolation scheme and the use of Gauß‐Lobatto‐Legendre (GLL) points. Employing GLL‐points does not only avoid Runge oscillations, but also yields a diagonal mass matrix when exploiting the nodal quadrature technique as a mass lumping scheme. Especially in high‐frequency transient analyses, where often explicit time integration schemes are utilized, having a diagonal mass matrix is an attractive property of the proposed element formulation. This is, however, achieved at the cost of an under‐integration of the mass matrix. Therefore, a special focus of this paper is placed on the evaluation of the numerical properties, such as the conditioning of the element matrices and the attainable rates of convergence (ROCs). To this end, the numerical behavior of the SBEs is comprehensively analyzed by means of selected benchmark examples. In a nutshell, the obtained results demonstrate that the element yields good accuracy in combination with an increased efficiency for structural dynamics exploiting the diagonal structure of the mass matrix.
Many parameter Hoelder perturbation of unbounded operators
Creators: name: Kriegl, Andreas
name: Michor, Peter W.
name: Rainer, Armin
Publisher: name: arXiv
Year: 2006
Subjects: subject: Functional Analysis (math.FA)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: 47A55, 47A56, 47B25

description: If $u\mapsto A(u)$ is a $C^{0,α}$-mapping, for $0< α\le 1$, having as values unbounded self-adjoint operators with compact resolvents and common domain of definition, parametrized by $u$ in an (even infinite dimensional) space, then any continuous (in $u$) arrangement of the eigenvalues of $A(u)$ is indeed $C^{0,α}$ in $u$.
description: LaTeX, 4 pages; The result is generalized from Lipschitz to Hoelder. Title changed
Few body impulse and fixed scatterer approximations for high energy scattering
Creators: name: Crespo, R.
name: Moro, A. M.
name: Thompson, I. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The elastic scattering differential cross section is calculated for proton scattering from $^6$He at 717 MeV, using single scattering terms of the multiple scattering expansion of the total transition amplitude (MST). We analyse the effects of different scattering frameworks, specifically the Factorized Impulse Approximation (FIA) and the Fixed Scatterer (adiabatic) Approximation (FSA) and the uncertainties associated with the use different structure models.
description: 22 pages, 9 figures. Accepted for publication in Nuclear Physics A
Transport in helical Luttinger liquids in the fractional quantum Hall regime
Creators: name: Wang, Ying
name: Ponomarenko, Vadim
name: West, Kenneth W.
name: Baldwin, Kirk
name: Pfeiffer, Loren N.
name: Lyanda-Geller, Yuli
name: Rokhinson, Leonid P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Domain walls in fractional quantum Hall ferromagnets are gapless helical one-dimensional channels formed at the boundaries of topologically distinct quantum Hall (QH) liquids. Naïvely, these helical domain walls (hDWs) constitute two counter-propagating chiral states with opposite spins. Coupled to an s-wave superconductor, helical channels are expected to lead to topological superconductivity with high order non-Abelian excitations. Here we investigate transport properties of hDWs in the $ν=2/3$ fractional QH regime. Experimentally we found that current carried by hDWs is substantially smaller than the prediction of the naïve model. Luttinger liquid theory of the system reveals redistribution of currents between quasiparticle charge, spin and neutral modes, and predicts the reduction of the hDW current. Inclusion of spin-non-conserving tunneling processes reconciles theory with experiment. The theory confirms emergence of spin modes required for the formation of fractional topological superconductivity.
description: 26 pages, 8 figures
The experience of recurring genital herpes for women
Creators: name: Schiemann, Rosemarie
Publisher: name: University of British Columbia
Year: 2009

description: A phenomenological research design was used to explore and describe the subjective experience of women who had recurring genital herpes in order to begin to understand how women make sense of their lived experience of the disease. Indepth interviews were conducted with six women from the Vancouver area during which the women described their experience of living with recurring genital herpes. Seven common themes emerged from the data using Colaizzi's (1978) method of phenomenological analysis. The results of the study indicated that the stigma associated with this incurable sexually-transmitted disease, the fact that the disease can be transmitted to others, and its recurrent nature contributed to an ongoing need for the women to deal with the disease and its consequences.
VLBI observations of supernova PTF11qcj: Direct constraints on the size of the radio ejecta
Creators: name: Palliyaguru, N. T.
name: Corsi, A.
name: Pérez-Torres, M.
name: Varenius, E.
name: Van Eerten, H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present High Sensitivity Array (HSA) and enhanced Multi Element Remotely Linked Interferometer Network (eMERLIN) observations of the radio-loud broad-lined type Ic supernova PTF11qcj obtained $\sim7.5$ years after the explosion. Previous observations of this supernova at 5.5 yrs since explosion showed a double-peaked radio light curve accompanied by a detection in the X-rays, but no evidence for broad H$α$ spectral features. The Very Long Baseline Interferometry (VLBI) observations presented here show that the PTF11qcj GHz radio ejecta remains marginally resolved at the sub-milliarcsecond level at $\approx 7.5$ yrs after the explosion, pointing toward a non-relativistic expansion. Our VLBI observations thus favor a scenario in which the second peak of the PTF11qcj radio light curve is related to strong interaction of the supernova ejecta with a circumstellar medium of variable density, rather than to the emergence of an off-axis jet. Continued VLBI monitoring of PTF11qcj in the radio may strengthen further this conclusion.
description: Submitted to ApJ, 8 pages, 4 figures
A two-zone photohadronic interpretation of the EHBL-like behavior of the 2016 multi-TeV flares of 1ES 1959+650
Creators: name: Sahu, Sarira
name: Fortín, Carlos E. López
name: Hernández, Luis H. Castañeda
name: Rajpoot, Subhash
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The high-energy-peaked blazar 1ES 1959+650 is a well-known and well studied nearby blazar that has undergone several episodes of multi-TeV flaring. In 2002 for the first time an orphan TeV flare was observed from this blazar. During a multiwavelength campaign between 29th April to 21st November 2016, MAGIC telescopes observed multi-TeV flarings during the nights of 13th, 14th June and 1st July 2016 when the position of the synchrotron peak was found to be above $10^{17}$ Hz. Also observed was that the second peak of the spectral energy distribution shifted towards higher energy, and exhibiting extreme HBL-like behavior. The photohadronic model which is very successful in explaning the multi-TeV flaring from many high energy blazars including 1ES 1959+650 is applied to study the flaring events of 2016. It is observed that the photohadronic model is unable to explain the observed spectra. Here, we use a two-zone photohadronic model to explain the observed spectra. We clearly demonstrate that the low energy regime (zone-1) of the spectra corresponds to the standard flaring events of the high energy blazar and the high energy regime (zone-2) of the spectra are solely due to the extreme nature of the flaring events. Our two-zone photohadronic model explains very well the multi-TeV flaring events observed by MAGIC telescopes.
description: 9 pages, 3 figures, Accepted for publication in The Astrophysical Journal
Neutral Hydrogen and Star Formation in the Coma-Abell1367 Supercluster
Creators: name: Cortese, Luca
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present preliminary results of a multi-wavelength study focused on the evolution of spiral galaxies in the UV-optical colour-magnitude (CM) diagram. By combining HI, UV and optical observations of the Coma-Abell1367 supercluster we are able to identify galaxies at different stages of their evolution: from healthy star-forming galaxies, to blue HI-poor spirals and transition objects. Our analysis shows that galaxies in the transition region are likely to be the progeny of healthy spirals, whose star-formation has been quenched by the harsh cluster environment. This result suggests that, at least in clusters of galaxies, the migration of galaxies from the blue to the red sequence might be due to environmental processes.
description: To appear in AIP Conf. Proc., "The Evolution of Galaxies through the Neutral Hydrogen Window", Feb 1-3 2008, Arecibo, eds. R. Minchin & E. Momjian. 4 pages, 2 figures
Signature of heavy Majorana neutrinos at a linear collider: Enhanced charged Higgs pair production
Creators: name: Atwood, David
name: Bar-Shalom, Shaouly
name: Soni, Amarjit
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A charged Higgs pair can be produced at an ee collider through a t-channel exchange of a heavy neutrino (N) via e^+ e^- -> H^+ H^- and, if N is a Majorana particle, also via the lepton number violating (LNV) like-sign reaction e^\pm e^\pm \to H^\pm H^\pm. Assuming no a-priori relation between the effective eNH^+ coupling (ξ) and light neutrino masses, we show that this interaction vertex can give a striking enhancement to these charged Higgs pair production processes. In particular, the LNV H^-H^- signal can probe N at the ILC in the mass range 100 GeV < m_N < 10^4 TeV and with the effective mixing angle, ξ, in the range 10^{-4} < ξ^2 < 10^{-8} - well within its perturbative unitarity bound and the neutrinoless double beta decay (ββ_{0ν}) limit. The lepton number conserving (LNC) e^+ e^- \to H^+ H^- mode can be sensitive to, e.g., an O(10) TeV heavy Majorana neutrino at a 500 GeV International Linear Collider (ILC), if ξ^2 > 0.001.
description: Latex, 5 pages, 3 figures. V2 as published in PRD