cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Trapping molecular ions formed via photo-associative ionization of ultracold atoms
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2011
Subjects: physics.atom-ph
physics.chem-ph

description: The formation of 40Ca2+ molecular ions is observed in a hybrid 40Ca magneto-optical and ion trap system. The molecular ion formation process is determined to be photo-associative ionization of ultracold 40Ca atoms. A lower bound for the two-body rate constant is found to be ≥ 2 ± 1 × 10-15 cm 3 Hz. Ab initio molecular potential curves are calculated for the neutral Ca2 and ionic Ca2+ molecules and used in a model that identifies the photo-associative ionization pathway. As this technique does not require a separate photo-association laser, it could find use as a simple, robust method for producing ultracold molecular ions. © the Owner Societies 2011.
The Dynamics of the One-Dimensional Delta-Function Bose Gas
Creators: name: Tracy, Craig A.
name: Widom, Harold
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 82C23

description: We give a method to solve the time-dependent Schroedinger equation for a system of one-dimensional bosons interacting via a repulsive delta function potential. The method uses the ideas of Bethe Ansatz but does not use the spectral theory of the associated Hamiltonian.
An Accurate Comprehensive Approach to Substructure: II. Stripped Subhaloes
Creators: name: Salvador-Solé, Eduard
name: Manrique, Alberto
name: Botella, Ignacio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In Paper I we used the CUSP formalism to derive from first principles and no single free parameter the accurate abundance and radial distribution of both diffuse DM (dDM) and subhaloes accreted onto haloes and their progenitors at all previous times. Here we use those results as initial conditions for the monitoring of the evolution of subhaloes and dDM within the host haloes. Specifically, neglecting dynamical friction, we accurately calculate the effects of repetitive tidal stripping and heating on subhaloes as they orbit inside the host halo and infer the amount of dDM and subsubhaloes they release into the intra-halo medium. We then calculate the expected abundance and radial distribution of stripped subhaloes and dDM. This derivation clarifies the role of halo concentration in substructure and unravels the origin of some key features found in simulations including the dependence of substructure on halo mass. In addition, it unveils the specific effects of dynamical friction on substructure. The results derived here are for purely accreting haloes. In Paper III we complete the study by addressing the case of low-mass subhaloes, unaffected by dynamical friction, in ordinary haloes having suffered major mergers.
description: 16 pages, 10 figures. Accepted for publication in MNRAS
QUICsand: Quantifying QUIC Reconnaissance Scans and DoS Flooding Events
Creators: name: Nawrocki, Marcin
name: Hiesgen, Raphael
name: Schmidt, Thomas C.
name: Wählisch, Matthias
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: In this paper, we present first measurements of Internet background radiation originating from the emerging transport protocol QUIC. Our analysis is based on the UCSD network telescope, correlated with active measurements. We find that research projects dominate the QUIC scanning ecosystem but also discover traffic from non-benign sources. We argue that although QUIC has been carefully designed to restrict reflective amplification attacks, the QUIC handshake is prone to resource exhaustion attacks, similar to TCP SYN floods. We confirm this conjecture by showing how this attack vector is already exploited in multi-vector attacks: On average, the Internet is exposed to four QUIC floods per hour and half of these attacks occur concurrently with other common attack types such as TCP/ICMP floods.
description: Proc. of ACM IMC'21, camera-ready
title: Harvesting Desktop Data for Semantic Blogging
Creators: name: Möller, Knud
name: Decker, Stefan
Publisher: name: University of Galway
Year: 2005
Subjects: subject: Blogs
subject: Semantic Web

description: A typical computer user¿s desktop contains large amount of formal data, such as addresses, events or bibliopraphies. Especially within a corporate or organizational environment, it is often important to exchange this data between employees. However, state-of-the-art communication technologies such as email or bulletin boards don¿t allow to easily integrate desk-top data in the communication process, with the effect that the data remains locked within a user¿s computer. In this paper, we propose that the recent phenomenon of blogging, combined with a tool to easily generate Semantic Web (SW) data from existing formal desktop data, can result in a form of semantic blogging which would help to overcome the aforementioned problem. We discuss a number of preconditions which must be met in order to allow semantic blogging and encourage users to author a semantic blog, and we present a prototype of the semiBlog editor, which was created with the purpose of user-friendly semantic blogging in mind. We argue that such a semantic blog editor should integrate tightly with a user¿s desktop environment, as this would make integration of existing data into the blog as easy as possible.
Preparatory experiments to investigate the radiosensitivity of human embryonic stem cells
Creators: name: Luft, S.
name: Schroeder, I.
name: Hessel, P.
name: Arrizabalaga, O.
name: Layer, P. G.
name: Durante, M.
name: Ritter, S.
Publisher: name: GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
Year: 2014
Subjects: Physics

description: GSI Scientific Report 2013 - GSI Report 2014-1
PROGRAM EVALUATION AND DEVELOPMENT OF A NURSE EDUCATION MODULE TO IMPROVE PSYCHIATRIC PATIENT AGITATION/ANXIETY ASSESSMENT AND CARE
Creators: name: Medina, Rachel
Publisher: name: Zenodo
Year: 2020

description: Admission to a psychiatric inpatient unit can be a stressful experience and often times patients are admitted in a state of crisis. This state of crisis can elicit emotions of agitation and/or anxiety. When these emotions are not quickly addressed there is an increased safety risk for psychiatric staff caring for these patients. This DNP project provides a programmatic evaluation that includes a review of the literature. The review of literature was used in the development of targeted nursing education designed to address anxiety and agitation on an inpatient adult psychiatric unit. A care protocol was then developed. This protocol would allow nurses to administer oral as needed (PRN) medications (ordered by the psychiatric physicians upon admission) to patients that met criteria. This project proposes that programmatic evaluation resulting in targeted nursing education can result in earlier assessment of anxiety and agitation in the psychiatric patient. An early assessment should lead to faster administration of oral psychotropics and potentially avoid negative sequelae such as incidents of assault against staff members (workplace violence), code grey alarms, seclusion and restraints. Keywords: psychiatry, nurse education module, PRN medications, workplace violence, program evaluation
Irradiation with $\alpha$-particles causes rapid activation of $K^+$ channels in A549 cells
Creators: name: Roth, B.
name: Gibhardt, C.
name: Durante, M.
name: Fournier, C.
name: Thiel, G.
Publisher: name: GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
Year: 2014
Subjects: Physics

description: GSI Scientific Report 2013 - GSI Report 2014-1
Different kinds of cognitive plausibility: why are transformers better than RNNs at predicting N400 amplitude?
Creators: name: Michaelov, James A.
name: Bardolph, Megan D.
name: Coulson, Seana
name: Bergen, Benjamin K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Despite being designed for performance rather than cognitive plausibility, transformer language models have been found to be better at predicting metrics used to assess human language comprehension than language models with other architectures, such as recurrent neural networks. Based on how well they predict the N400, a neural signal associated with processing difficulty, we propose and provide evidence for one possible explanation - their predictions are affected by the preceding context in a way analogous to the effect of semantic facilitation in humans.
From Elasticity to Hypoplasticity: Dynamics of Granular Solids
Creators: name: Jiang, Yimin
name: Liu, Mario
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: "Granular elasticity," useful for calculating static stress distributions in granular media, is generalized by including the effects of slowly moving, deformed grains. The result is a hydrodynamic theory for granular solids that agrees well with models from soil mechanics.
Anisotropy in the interaction of ultracold dysprosium
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2011
Subjects: quant-ph

description: The nature of the interaction between ultracold atoms with a large orbital and spin angular momentum has attracted considerable attention. It was suggested that such interactions can lead to the realization of exotic states of highly correlated matter. Here, we report on a theoretical study of the competing anisotropic dispersion, magnetic dipole-dipole, and electric quadrupole-quadrupole forces between two dysprosium atoms. Each dysprosium atom has an orbital angular momentum of L = 6 and a magnetic moment of μ = 10 μB. We show that the dispersion coefficients of the ground state adiabatic potentials lie between 1865 a.u. and 1890 a.u., creating a non-negligible anisotropy with a spread of 25 a.u. and that the electric quadrupole-quadrupole interaction is weak compared to the other interactions. We also find that for interatomic separations R < 50a0 both the anisotropic dispersion and magnetic dipole-dipole potential are larger than the atomic Zeeman splittings for external magnetic fields of order 10 G to 100 G. At these separations the atomic angular momentum can be reoriented. We finish by describing two scattering models for these inelastic m-changing collisions. A universal scattering theory is used to model loss due to the anisotropy in the dispersion and a Born approximation is used to model losses from the magnetic dipole-dipole interaction for the 164Dy isotope. These models find loss rates that are of the same order of magnitude as the experimental value. © the Owner Societies 2011.
MUGI-MRI: Enhancing Breast Cancer Classification through Multiplex Graph Neural Networks in DCE-MRI.
Creators: name: Ceccarelli, Francesco
name: Prinzi, Francesco
name: Liò, Pietro
name: Vitabile, Salvatore
name: Holden, Sean B
Publisher: name: IEEE
Year: 2024

description: Abstract—Dynamic Contrast-Enhanced Magnetic Resonance Imaging (DCE-MRI) involves acquiring a sequence of MRIs during the administration of a contrast agent. Radiologists then aim to discern the contrast uptake differences between malignant and benign lesions for tumor classification. Regrettably, existing literature underutilizes the temporal structure inherent to DCE- MRI time series, leading to tumor classifications based on individual instants rather than entire sequences. This research introduces two Graph Neural Network (GNN)-based methods designed to aggregate information from multiple instants within the DCE-MRI sequence. Each lesion undergoes manual segmen- tation, and radiomic features are individually extracted from each time instant of the DCE-MRI sequence. Two graph construction methodologies are proposed: (i) a fully connected graph topology, aiming to represent each temporal instant as a node in a graph; (ii) a multiplex network, named MUGI-MRI (MUltiplex Graph neural network for Integration of MRI), where each layer identifies an instant of the DCE-MRI sequence. MUGI-MRI achieves an AUROC of 0.8017 ± 0.1146, showcasing promising performance in lesion classification. In addition to improving upon current state-of-the-art, the integration capability of MUGI- MRI addresses the problem of imbalance between sensitivity and specificity, which affects numerous studies in the realm of DCE-MRI. Our findings strongly indicate that the aggregation of information across all time instants is pivotal for enhancing the diagnostic process, and vastly superior to a simplistic instant- wise analysis. While applied to MRI sequences, our approach can be extended to general problems of multimodal data integration.
A study of numerical techniques for the initial value problem of general relativity
Creators: name: Choptuik, Matthew William
Publisher: name: University of British Columbia
Year: 2010

description: Numerical relativity is concerned with the generation of solutions to Einstein's equations by numerical means. In general, the construction of such a spacetime is accomplished in two stages: 1) the determination of initial data which is specified on a single spacelike hypersurface and satisfies four initial value equations, and 2) the evolution of the initial data to generate the spacetime or some portion of it. One of the key problems is the development of efficient algorithms for the solutions of these equations, as they are sufficiently complex to tax the fastest present computers. This thesis presents a comparison of various algorithms for the solution of the initial value equations, concentrating on the recently developed multi-grid method. The specific problem examined has been previously studied by Bowen, Piran and York. Their initial data has been interpreted as representing "snapshots" of three new families of black holes. Three of the four initial value equations possess analytic solutions. The remaining 2-dimensional nonlinear partial differential equation is solved numerically in this thesis using finite difference techniques. The performance of the multi-grid method, with respect to three more well-known methods, is evaluated through numerical experiments. The speed and reliability of the multi-grid algorithm are found to be very good. In addition, the results which had been previously calculated numerically by Piran are essentially reproduced, with the correction of some errors in that work. Possible extensions of the work to more complex initial value problems are also discussed.
Innovation in Scholarly Communication: Vision and Projects from High-Energy Physics
Creators: name: Heuer, Rolf-Dieter
name: Holtkamp, Annette
name: Mele, Salvatore
Publisher: name: arXiv
Year: 2008
Subjects: subject: Digital Libraries (cs.DL)
subject: FOS: Computer and information sciences

description: Having always been at the forefront of information management and open access, High-Energy Physics (HEP) proves to be an ideal test-bed for innovations in scholarly communication including new information and communication technologies. Three selected topics of scholarly communication in High-Energy Physics are presented here: A new open access business model, SCOAP3, a world-wide sponsoring consortium for peer-reviewed HEP literature; the design, development and deployment of an e-infrastructure for information management; and the emerging debate on long-term preservation, re-use and (open) access to HEP data.
description: Based on a keynote talk of Rolf-Dieter Heuer at APE2008, International Conference on "Academic Publishing in Europe", Berlin, January 22nd-23rd 2008
Faranoff-Riley type I jet deceleration at density discontinuities "Relativistic hydrodynamics with realistic equation of state"
Creators: name: Meliani, Z.
name: Keppens, R.
name: Giacomazzo, B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The deceleration mechanisms for relativistic jets in active galactic nuclei remain an open question, and in this paper we propose a model which could explain sudden jet deceleration, invoking density discontinuities. This is particularly motivated by recent indications from HYMORS. Exploiting high resolution, numerical simulations, we demonstrate that for both high and low energy jets, always at high Lorentz factor, a transition to a higher density environment can cause a significant fraction of the directed jet energy to be lost on reflection. This can explain how one-sided jet deceleration and a transition to FR I type can occur in HYMORS, which start as FR II (and remain so on the other side). For that purpose, we implemented in the relativistic hydrodynamic grid-adaptive AMRVAC code, the Synge-type equation of state introduced in the general polytropic case by Meliani et al. (2004). We present results for 10 model computations, varying the inlet Lorentz factor from 10 to 20, including uniform or decreasing density profiles, and allowing for cylindrical versus conical jet models. As long as the jet propagates through uniform media, we find that the density contrast sets most of the propagation characteristics, fully consistent with previous modeling efforts. When the jet runs into a denser medium, we find a clear distinction in the decelaration of high energy jets depending on the encountered density jump. For fairly high density contrast, the jet becomes destabilised and compressed, decelerates strongly (up to subrelativistic speeds) and can form knots. We point out differences that are found between cylindrical and conical jet models, together with dynamical details like the Richtmyer-Meshkov instabilities developing at the original contact interface.
description: accepted in A&A
Temporal Loss Boundary Engineered Photonic Cavity
Creators: name: Cong, Longqing
name: Han, Jiaguang
name: Zhang, Weili
name: Singh, Ranjan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Losses are ubiquitous and unavoidable in nature inhibiting the performance of most optical processes. Manipulating losses to adjust the dissipation of photons is analogous to braking a running car that is as important as populating photons via a gain medium. Here, we introduce the transient loss boundary into a photon populated cavity that functions as a photon brake and probe photon dynamics by engineering the brake timing and brake strength. Coupled cavity photons can be distinguished by stripping one photonic mode through controlling the loss boundary, which enables the transition from a coupled to an uncoupled state. We interpret the transient boundary as a perturbation by considering both real and imaginary parts of permittivity, and the dynamic process is modelled with a temporal two-dipole oscillator, one with the natural resonant polarization and the other with a frequency-shift polarization. The model unravels the underlying mechanism of concomitant coherent spectral oscillations and generation of tone-tuning cavity photons in the braking process. By synthesizing the temporal loss boundary into a photon populated cavity, a plethora of interesting phenomena and applications are envisioned such as the observation of quantum squeezed states, low-loss nonreciprocal waveguides and ultrafast beam scanning devices.
description: 18 pages,5 figures,accepted in Nature Communications
Nationalization as credible threat against tacit collusion
Creators: name: Delbono, Flavio
name: Lambertini, Luca
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: SECS-P/01 Economia politica

description: Within a simple model of differentiated oligopoly, we show that tacit collusion may be prevented by the threat of nationalising a private firm coupled with the appropriate choice of the weight given to private profits in the maximand of the nationalised company. We characterise the properties of such a threat and prove that it may allow to credibly deter tacit collusion.
Interior gradient estimates for solutions to the linearized Monge-Ampère equation
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2011
Subjects: Monge-Ampere equations
Holder estimates

description: Let φ be a convex function on a convex domain Sigma;CRn, n≥1. The corresponding linearized Monge-Ampère equation is. trace(φD2u)=f, where φ:=detD2φ(D2φ)-1 is the matrix of cofactors of D2φ. We establish interior Hölder estimates for derivatives of solutions to such equation when the function f on the right-hand side belongs to Lp(Ω) for some p>n. The function φ is assumed to be such that φbSigma;C(Ω) with φ=0 on ∂. Ω and the Monge-Ampère measure detD2φ is given by a density gSigma;C(Sigma;) which is bounded away from zero and infinity. © 2011 Elsevier Inc.
Galaxy density profiles and shapes -- I. simulation pipeline for lensing by realistic galaxy models
Creators: name: van de Ven, Glenn
name: Mandelbaum, Rachel
name: Keeton, Charles R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Studies of strong gravitational lensing in current and upcoming wide and deep photometric surveys, and of stellar kinematics from (integral-field) spectroscopy at increasing redshifts, promise to provide valuable constraints on galaxy density profiles and shapes. However, both methods are affected by various selection and modelling biases, whch we aim to investigate in a consistent way. In this first paper in a series we develop a flexible but efficient pipeline to simulate lensing by realistic galaxy models. These galaxy models have separate stellar and dark matter components, each with a range of density profiles and shapes representative of early-type, central galaxies without significant contributions from other nearby galaxies. We use Fourier methods to calculate the lensing properties of galaxies with arbitrary surface density distributions, and Monte Carlo methods to compute lensing statistics such as point-source lensing cross-sections. Incorporating a variety of magnification bias modes lets us examine different survey limitations in image resolution and flux. We rigorously test the numerical methods for systematic errors and sensitivity to basic assumptions. We also determine the minimum number of viewing angles that must be sampled in order to recover accurate orientation-averaged lensing quantities. We find that for a range of non-isothermal stellar and dark matter density profiles typical of elliptical galaxies, the combined density profile and corresponding lensing properties are surprisingly close to isothermal around the Einstein radius. The converse implication is that constraints from strong lensing and/or stellar kinematics, which are indeed consistent with isothermal models near the Einstein radius, cannot trivially be extrapolated to smaller and larger radii.
description: 31 pages, 15 figures; paper II at arXiv:0808.2497; accepted for publication in MNRAS; PDF file with full resolution figures at http://www.sns.ias.edu/~glenn/paper1.pdf
High-precision measurement of the proton elastic form factor ratio μpGE/GM at low Q2
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2011
Subjects: nucl-ex

description: We report a new, high-precision measurement of the proton elastic form factor ratio μpGE/GM for the four-momentum transfer squared Q2=0.3-0.7(GeV/c)2. The measurement was performed at Jefferson Lab (JLab) in Hall A using recoil polarimetry. With a total uncertainty of approximately 1%, the new data clearly show that the deviation of the ratio μpGE/GM from unity observed in previous polarization measurements at high Q2 continues down to the lowest Q2 value of this measurement. The updated global fit that includes the new results yields an electric (magnetic) form factor roughly 2% smaller (1% larger) than the previous global fit in this Q2 range. We obtain new extractions of the proton electric and magnetic radii, which are 〈rE2v1/2=0.875±0.010 fm and 〈rM2〉1/2=0.867±0.020 fm. The charge radius is consistent with other recent extractions based on the electron-proton interaction, including the atomic hydrogen Lamb shift measurements, which suggests a missing correction in the comparison of measurements of the proton charge radius using electron probes and the recent extraction from the muonic hydrogen Lamb shift. © 2011.
Hindsight Goal Ranking on Replay Buffer for Sparse Reward Environment
Creators: name: Luu, Tung M.
name: Yoo, Chang D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: This paper proposes a method for prioritizing the replay experience referred to as Hindsight Goal Ranking (HGR) in overcoming the limitation of Hindsight Experience Replay (HER) that generates hindsight goals based on uniform sampling. HGR samples with higher probability on the states visited in an episode with larger temporal difference (TD) error, which is considered as a proxy measure of the amount which the RL agent can learn from an experience. The actual sampling for large TD error is performed in two steps: first, an episode is sampled from the relay buffer according to the average TD error of its experiences, and then, for the sampled episode, the hindsight goal leading to larger TD error is sampled with higher probability from future visited states. The proposed method combined with Deep Deterministic Policy Gradient (DDPG), an off-policy model-free actor-critic algorithm, accelerates learning significantly faster than that without any prioritization on four challenging simulated robotic manipulation tasks. The empirical results show that HGR uses samples more efficiently than previous methods across all tasks.
Reference values for Cobb angles when evaluating the spine in the sagittal plane: a systematic review with meta-analysis
Creators: name: Furlanetto, Tássia Silveira
name: Sedrez, Juliana Adami
name: Candotti, Cláudia Tarragô
name: Loss, Jefferson Fagundes
Publisher: name: Motricidade
Year: 2018

description: The present systematic review of observational studies with meta-analysis aim to identify the reference values of the spinal curvatures in the sagittal plane, as evaluated using the Cobb angle in X-rays, in healthy individuals. Electronic searches were undertaken in MEDLINE, Scopus, ScienceDirect and LILACS. Studies that evaluated the spinal curvature of healthy children, adolescents, adults, and elderly using Cobb method and presented reference values for those curvatures were incluced. Thirty-one studies were eligible for inclusion. The reference values found (confidence interval 95%) were: for children, thoracic (28.7°-37.9°), lumbar L1-L5 (34.5o-44.8º), and lumbar L1-S1 (41.7o-54.1o); for adolescents: thoracic (31.5o-39.2o), lumbar L1-L5 (39.8o-45.6o), and lumbar L1-S1 (51.9o-59.1o); for adults: thoracic (33.7o-40.3o), lumbar L1-L5 (38.1o-45.6o), and lumbar L1-S1 (54.2o-61.7o); and for the elderly: thoracic (37.7º-50.4o), and lumbar L1-S1 (56.6º-65.9o). For the cervical region, it was impossible to establish consistent reference values. The present study supports that precise reference intervals were identified for the sagittal curvatures of the thoracic and lumbar spine in healthy children, adolescents, adults and elderly, as evaluated by means of the Cobb Method.
description: Motricidade, Vol 14 No 2-3 (2018): Motricidade
Futsal as a strategy for the improvement of elementary abilities and for the development of the body image in children
Creators: name: Machado, Amanda A.
name: Bezerra, Ingrid S.
name: Ponciano, Katia Regina
name: Rica, Roberta L.
name: Gama, Eliane F.
name: Figueira Junior, Aylton
name: Gimenez, Roberto
name: Bocalini, Danilo Sales
Publisher: name: Motricidade
Year: 2018

description: This current study aims to analyze the contribution of futsal practice in global praxis and body image in children in a specialized motor stage, evaluating the motor performance before and after an intervention in the following factors: hands and feet global praxis and body image. It was adopted the application method of 18 one-hour twice a week session, divided into three modules, I) displacement activities in different directions; II) coordination activities and reaction time and III) throwing and kicking activities. Twenty male participants, aged 8 to 12 years, with normal motor development were used. The survey was conducted at a private school. The results found were a significant improvement in the hits of the tennis balls with hands and make the number of hits in kicking the ball with his feet. Regarding the analysis of body image after the proposed intervention, the children has shown the body parts performance incorporated in drawings that were not previously present. It is concluded that there are positive contributions of the futsal practice in respect to the global praxis practice and body image in children in a specialized motor stage.
description: Motricidade, Vol 14 No 2-3 (2018): Motricidade
Perceived Risk Questionnaire in Canyoners: content validity, cross-validation and transcultural invariance across Portugal and Spain
Creators: name: Brandão, António
name: Monteiro, Diogo
name: Pereira, Joel
name: Coelho, Eduarda
name: Quaresma, Luís
Publisher: name: Motricidade
Year: 2018

description: The aim of this study was to develop and validate a questionnaire related to the risk perception in canyoning. Cross-validation and transcultural invariance, across Portugal and Spain, were also analysed. A total of 707 canyoners (81.3% males, 18.7% females) from Portugal (47.5%) and Spain (52.5%) participated in this study, with ages between 18 and 57 years old (M = 36.13; SD = 7.71). The initial version of questionnaire had 49 items. With the Temporal Reliability Analysis, the items that showed no correlation between the two moments of the administration of the questionnaire, p>.05, were removed and only 46 items remained. The Exploratory Factor Analysis was developed by choosing the 25 items with higher factorial weight. Six dimensions were found which we managed to identify and characterise with the help of literature. With the Confirmatory Factor Analysis and based on the analysis of the modification indices, 4 items were eliminated, as they presented very high residual values, which contributed to an inadequacy of the model. In this manner, a questionnaire with 21 items was achieved. The final version of the questionnaire showed acceptable values related to reliability and construct validation. Therefore, this allows it to be used in the risk perception in canyoning, with 21 items, distributed among 6 dimensions.
description: Motricidade, Vol 14 No 2-3 (2018): Motricidade
Complexity of magnetic-field turbulence at reconnection exhausts in the solar wind at 1 AU
Creators: name: Miranda, Rodrigo A.
name: Valdivia, Juan A.
name: Chian, Abraham C. -L.
name: Muñoz, Pablo R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Magnetic reconnection is a complex mechanism that converts magnetic energy into particle kinetic energy and plasma thermal energy in space and astrophysical plasmas. In addition, magnetic reconnection and turbulence appear to be intimately related in plasmas. We analyze the magnetic-field turbulence at the exhaust of four reconnection events detected in the solar wind using the Jensen-Shannon complexity-entropy index. The interplanetary magnetic field is decomposed into the LMN coordinates using the hybrid minimum variance technique. The first event is characterized by an extended exhaust period that allows us to obtain the scaling exponents of higher-order structure functions of magnetic-field fluctuations. By computing the complexity-entropy index we demonstrate that a higher degree of intermittency is related to lower entropy and higher complexity in the inertial subrange. We also compute the complexity-entropy index of three other reconnection exhaust events. For all four events, the $B_L$ component of the magnetic field displays a lower degree of entropy and higher degree of complexity than the $B_M$ and $B_N$ components. Our results show that coherent structures can be responsible for decreasing entropy and increasing complexity within reconnection exhausts in magnetic-field turbulence.
Ab initio properties of Li-group-II molecules for ultracold matter studies
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2011
Subjects: quant-ph
physics.chem-ph

description: We perform a systematic investigation of the electronic properties of the 2σ+ ground state of Li-alkaline-earth dimers. These molecules are proposed as possible candidates for quantum simulation of lattice-spin models. We apply powerful quantum chemistry coupled-cluster method and large basis sets to calculate potential energies and permanent dipole moments for the LiBe, LiMg, LiCa, LiSr, and LiYb molecules. Agreement of calculated molecular constants with existing experimental data is better than or equal to 8. Our results reveal a surprising irregularity in the dissociation energy and bond length with an increase in the reduced mass of the molecule. At the same time, the permanent dipole moment at the equilibrium separation has the smallest value between 0.01 a.u. and 0.1 a.u. for the heaviest (LiSr and LiYb) molecules and increases to 1.4 a.u. for the lightest (LiBe), where 1 a.u. is one atomic unit of dipole moment. We consider our study of the 2σ + molecules a first step towards a comprehensive analysis of their interactions in an optical trap. © 2011 American Institute of Physics.
Anomalous femtosecond quasiparticle dynamics of hidden order state in URu2Si2
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2011
Subjects: cond-mat.str-el

description: At T0=17.5 K an exotic phase emerges from a heavy fermion state in URu2Si2. The nature of this hidden order (HO) phase has so far evaded explanation. Formation of an unknown quasiparticle (QP) structure is believed to be responsible for the massive removal of entropy at the HO transition, however, experiments and ab initio calculations have been unable to reveal the essential character of the QP. Here we use femtosecond pump-probe time- and angle-resolved photoemission spectroscopy (tr-ARPES) to elucidate the ultrafast dynamics of the QP. We show how the Fermi surface is renormalized by shifting states away from the Fermi level at specific locations, characterized by vector q110=0.56±0.08 Å-1. Measurements of the temperature-time response reveal that, upon entering the HO, the QP lifetime in those locations increases from 42 fs to few hundred fs. The formation of the long-lived QPs is identified here as a principal actor of the HO. © 2011 American Physical Society.
Environment-Assisted Quantum Walks in Photosynthetic Energy Transfer
Creators: name: Mohseni, Masoud
name: Rebentrost, Patrick
name: Lloyd, Seth
name: Aspuru-Guzik, Alán
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Biological Physics (physics.bio-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Energy transfer within photosynthetic systems can display quantum effects such as delocalized excitonic transport. Recently, direct evidence of long-lived coherence has been experimentally demonstrated for the dynamics of the Fenna-Matthews-Olson (FMO) protein complex [Engel et al., Nature 446, 782 (2007)]. However, the relevance of quantum dynamical processes to the exciton transfer efficiency is to a large extent unknown. Here, we develop a theoretical framework for studying the role of quantum interference effects in energy transfer dynamics of molecular arrays interacting with a thermal bath within the Lindblad formalism. To this end, we generalize continuous-time quantum walks to non-unitary and temperature-dependent dynamics in Liouville space derived from a microscopic Hamiltonian. Different physical effects of coherence and decoherence processes are explored via a universal measure for the energy transfer efficiency and its susceptibility. In particular, we demonstrate that for the FMO complex an effective interplay between free Hamiltonian and thermal fluctuations in the environment leads to a substantial increase in energy transfer efficiency from about 70% to 99%.
description: 9 pages, 3 figures, improved presentation, updated references, to appear in Journal of Chemical Physics
Thermal near-field energy density and LDOS in topological 1D SSH chains and 2D SSH lattices of plasmonic nanoparticles
Creators: name: Ott, Annika
name: An, Zhenghua
name: Kittel, Achim
name: Biehs, Svend-Age
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We derive a general expression for electric and magnetic part of the near-field energy density of $N$ dipoles of temperatures $T_1, \ldots, T_N$ immersed in a background field having a different temperature $T_b$. In contrast to former expressions this inclusion of the background field allows for determining the energy density of heated or cooled isotropic dipolar objects within an arbitrary environment which is thermalized at a different temperature. Furthermore, we show how the energy density is related to the local density of states. We use this general expression to study the near-field enhanced energy density at the edges and corners of 1D Su-Schrieffer-Heeger chains and 2D Su-Schrieffer-Heeger lattices of plasmonic InSb nanoparticles when the phase transition from a topological trivial to a topological non-trivial state is made. We discuss the robustness of these modes when adding defects and the possibility to measure the topological edge and corner modes.
Kinetics of bound excitons and multi-exciton complexes in Si (B)
Creators: name: Sullivan, Brian Thomas
Publisher: name: University of British Columbia
Year: 2010

description: The kinetics of the free exciton, bound exciton and multi-exciton complexes have been investigated for Si(B) by using the rate equations to analyze the experimental transient responses of these luminescent species. From this analysis, the B capture cross section for an exciton to bind upon a neutral impurity has been determined, as well as the B capture cross sections ratios for higher order complexes. Furthermore, the lifetimes for the BE, BMEC-2 and BMEC-3 have been determined. From the low temperature lifetimes, the BMEC-m/BE lifetime ratio appears to form a simple integer series for increasing m. The computer programs used to analyze the experimental data and generate the theoretical transient responses, along with technical information concerning the experiment, are listed in the appendices.
Convergence of quantum random walks with decoherence
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2011
Subjects: math.PR

description: In this paper, we study the discrete-time quantum random walks on a line subject to decoherence. The convergence of the rescaled position probability distribution p(x,t) depends mainly on the spectrum of the superoperator L kk. We show that if 1 is an eigenvalue of the superoperator with multiplicity one and there is no other eigenvalue whose modulus equals 1, then P(ν√t,t) converges to a convex combination of normal distributions. In terms of position space, the rescaled probability mass function p t(x,t)≡p(√tx,t), x Z/√t, converges in distribution to a continuous convex combination of normal distributions. We give a necessary and sufficient condition for a U(2) decoherent quantum walk that satisfies the eigenvalue conditions. We also give a complete description of the behavior of quantum walks whose eigenvalues do not satisfy these assumptions. Specific examples such as the Hadamard walk and walks under real and complex rotations are illustrated. For the O(2) quantum random walks, an explicit formula is provided for the scaling limit of p(x,t) and their moments. We also obtain exact critical exponents for their moments at the critical point and show universality classes with respect to these critical exponents. © 2011 American Physical Society.
Orientational order in two dimensions from competing interactions at different scales
Creators: name: Barci, Daniel G.
name: Stariolo, Daniel A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We discuss orientational order in two dimensions in the context of systems with competing isotropic interactions at different scales. We consider an extension of the Brazovskii model for stripe phases including explicitly quartic terms with nematic symmetry in the energy. We show that leading fluctuations of the mean field nematic solution drive the isotropic-nematic transition into the Kosterlitz-Thouless universality class, i.e. these systems have a thermodynamic phase with orientational quasi-long-range order.
description: 7 pages, no figures
Relationship between shoulder pain and weight of shoulder bags in young women
Creators: name: Abdon, Ana Paula Vasconcellos
name: Moraes, Thais Erica Gonçalves
name: Sales, Mayara Prado E
name: Vasconcelos, Renata Dos Santos
name: Braga, Ticiana Sampaio
name: Ferreira, Thais Sousa Pinto
name: Mont’Alverne, Daniela Gardano Burchales
Publisher: name: Motricidade
Year: 2018

description: The present study aimed to assess the relationship between shoulder pain and weight of shoulder bags in young women. Cross-sectional study conducted with 316 women aged 18-35 years from February 2013 to July 2014. A questionnaire was used to collect demographic data and information on physical activity, sleeping habits, presence of pain and its characteristics, use of bags, and percentage of bag weight–body weight ratio (%bagweight). Pearson’s chi-squared test and Mann-Whitney test were used to check for associations between the dependent variable (presence of pain) and the independent variables, with a significance level of 5% (p<0.05). In all, 195 (61.7%) women complained of shoulder pain. These women carried heavier shoulder bags (p=0.01), weighing circa 4.02% of their body weight (p=0.050), and the pain was proportional to a higher bag weight (p=0.023) compared to the painless group. Lack of physical activity and inadequate sleep position influenced the occurrence of shoulder pain (p=0.008 and p=0.017, respectively). The weight of the shoulder bag represented a risk factor for the onset of shoulder pain and women should not carry bags weighing more than 4% of their body weight.
description: Motricidade, Vol 14 No 2-3 (2018): Motricidade
Precision study of excited state effects in nucleon matrix elements
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2011
Subjects: Nucleon matrix element
Parton distribution function
Lattice QCD

description: We present a dedicated analysis of the influence of excited states on the calculation of nucleon matrix elements. This calculation is performed at a fixed value of the lattice spacing, volume and pion mass that are typical of contemporary lattice computations. We focus on the nucleon axial charge, gA, for which we use about 7500 measurements, and on the average momentum of the unpolarized isovector parton distribution, 〈x〉u-d, for which we use about 23,000 measurements. All computations are done employing Nf=2+1+1 maximally-twisted-mass Wilson fermions and using non-perturbatively calculated renormalization factors. Excited state effects are shown to be negligible for gA, whereas they lead to an O(10%) downward shift for 〈x〉u-d. © 2011 Elsevier B.V.
Distribution of linearly polarized gluons inside a large nucleus
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2011
Subjects: hep-ph

description: The distribution of linearly polarized gluons inside a large nucleus is studied in the framework of the color glass condensate. We find that the Weizsäcker-Williams distribution saturates the positivity bound at large transverse momenta and is suppressed at small transverse momenta, whereas the dipole distribution saturates the bound for any value of the transverse momentum. We also discuss processes in which both distributions of linearly polarized gluons can be probed. © 2011 American Physical Society.
Exact shering box solutions of MHD flows with resistivity, viscosity and cooling
Creators: name: Lesaffre, P.
name: Balbus, S. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Axisymmetric incompressible modes of the magneto-rotational instability (MRI) with a vertical wavenumber are exact solutions of the non-linear local equations of motion for a disk (shearing box). They are referred to as "channel solutions". Here, we generalize a class of these solutions to include energy losses, viscous, and resistive effects. In the limit of zero shear, we recover the result that torsional Alfvén waves are exact solutions of the non-linear equations. Our method allows the extension of these solutions into the dissipative regime. These new solutions serve as benchmarks for simulations including dissipation and energy loss, and to calibrate numerical viscosity and resistivity in the Zeus3D code. We quantify the anisotropy of numerical dissipation and compute its scaling with time and space resolution. We find a strong dependence of the dissipation on the mean magnetic field that may affect the saturation state of the MRI as computed with Zeus3D. It is also shown that elongated grid cells generally preclude isotropic dissipation and that a Courant time step smaller than that which is commonly used should be taken to avoid spurious anti-diffusion of magnetic field.
description: 17 pages, 18 figures, MNRAS in press
TechOceanS Milestone 8 - TRL7 achieved (M48)
Creators: name: National Oceanography Centre
Publisher: name: Zenodo
Year: 2024

description: This public milestone report (milestone 8) of the H2020 project TechOceanS outlines the successful achievement of Technology Readiness Level (TRL) 7 for several components relating to ocean sensing technologies being developed through the project.

For further information please visit techoceans.eu.
Optimal prediction for radiative transfer: A new perspective on moment closure
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2011
Subjects: Radiative transfer
method of moments
optimal prediction
measure
diffusion approximation

description: Moment methods are classical approaches that approximate the mesoscopic radiative transfer equation by a system of macroscopic moment equations. An expansion in the angular variables transforms the original equation into a system of infinitely many moments. The truncation of this infinite system is the moment closure problem. Many types of closures have been presented in the literature. In this note, we demonstrate that optimal prediction, an approach originally developed to approximate the mean solution of systems of nonlinear ordinary differential equations, can be used to derive moment closures. To that end, the formalism is generalized to systems of partial differential equations. Using Gaussian measures, existing linear closures can be re-derived, such as PN, diffusion, and diffusion correction closures. This provides a new perspective on several approximations done in the process and gives rise to ideas for modifications to existing closures. © American Institute of Mathematical Sciences.