cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Efficient linear scaling mapping for permutation symmetric Fock spaces
Creators: name: Zeb, M. Ahsan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Numerically solving a second quantised many-body model in the permutation symmetric Fock space can be challenging for two reasons: (i) an increased complication in the calculations of the matrix elements of various operators, and (ii) a poor scaling of the cost of these calculations with the Fock space size. We present a method that solves both these problems. We find a mapping that can be used to simplify the calculations of the matrix elements. The mapping is directly generated so its computational cost scales only linearly with the space size and is negligible even for large enough sizes that approach the thermodynamic limit. A fortran implementation of the method as a library - FockMap - is provided along with a test program.
description: 9 pages, 2 figures, with fortran library source
title: L'initiation
Creators: name: Althabégoity, Galla
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2024
Subjects: subject: ngbugu
subject: lnl

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Haptic Teleoperation of High-dimensional Robotic Systems Using a Feedback MPC Framework
Creators: name: Cheng, Jin
name: Abi-Farraj, Firas
name: Farshidian, Farbod
name: Hutter, Marco
Publisher: name: ETH Zurich
Year: 2022
Subjects: Robotics (cs.RO)
Systems and Control (eess.SY)
FOS: Computer and information sciences
FOS: Electrical engineering, electronic engineering, information engineering

description: Model Predictive Control (MPC) schemes have proven their efficiency in controlling high degree-of-freedom (DoF) complex robotic systems. However, they come at a high computational cost and an update rate of about tens of hertz. This relatively slow update rate hinders the possibility of stable haptic teleoperation of such systems since the slow feedback loops can cause instabilities and loss of transparency to the operator. This work presents a novel framework for transparent teleoperation of MPC-controlled complex robotic systems. In particular, we employ a feedback MPC approach and exploit its structure to account for the operator input at a fast rate which is independent of the update rate of the MPC loop itself. We demonstrate our framework on a mobile manipulator platform and show that it significantly improves haptic teleoperation's transparency and stability. We also highlight that the proposed feedback structure is constraint satisfactory and does not violate any constraints defined in the optimal control problem. To the best of our knowledge, this work is the first realization of the bilateral teleoperation of a legged manipulator using a whole-body MPC framework.
description: arXiv
title: La nourriture, l'agriculture et la pêche
Creators: name: Althabégoity, Galla
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2024
Subjects: subject: ngbugu
subject: lnl

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
A Constant Approximation Algorithm for Sequential Random-Order No-Substitution k-Median Clustering
Creators: name: Hess, Tom
name: Moshkovitz, Michal
name: Sabato, Sivan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: We study k-median clustering under the sequential no-substitution setting. In this setting, a data stream is sequentially observed, and some of the points are selected by the algorithm as cluster centers. However, a point can be selected as a center only immediately after it is observed, before observing the next point. In addition, a selected center cannot be substituted later. We give the first algorithm for this setting that obtains a constant approximation factor on the optimal risk under a random arrival order, an exponential improvement over previous work. This is also the first constant approximation guarantee that holds without any structural assumptions on the input data. Moreover, the number of selected centers is only quasi-linear in k. Our algorithm and analysis are based on a careful risk estimation that avoids outliers, a new concept of a linear bin division, and a multiscale approach to center selection.
New decay rates for a Cauchy thermelastic laminated Timoshenko problem with interfacial slip under Fourier or Cattaneo laws
Creators: name: Guesmia, Aissa
Publisher: name: arXiv
Year: 2021
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 34B05, 34D05, 34H05

description: The objective of the present paper is to investigate the decay of solutions for a laminated Timoshenko beam with interfacial slip in the whole space R subject to a thermal effect acting only on one component modelled by either Fourier or Cattaneo law. When the thermal effect is acting via the second or third component of the laminated Timoshenko beam (rotation angle displacement or dynamic of the slip), we obtain that both systems, Timoshenko-Fourier and Timoshenko-Cattaneo systems, satisfy the same polynomial stability estimates in the L2 -norm of the solution and its higher order derivatives with respect of the space variable. The decay rate depends on the regularity of the initial data. In addition, the presence and absence of the regularity-loss type property are determined by some relations between the parameters of systems. However, when the thermal effect is acting via the first comoponent of the system (transversal displacement), a new stability condition is introduced for both TimoshenkoFourier and Timoshenko-Cattaneo systems. This stability condition is in the form of threshold between polynomial stability and convergence to zero. To prove our results, we use the energy method in Fourier space combined with judicious choices of weight functions to build appropriate Lyapunov functionals.
description: arXiv admin note: substantial text overlap with arXiv:2102.01735
Public Value Capture of Increasing Property Values across Europe
Creators: name: Halleux, Jean-Marie
name: Hendricks, Andreas
name: Nordahl, Berit
name: Maliene, Vida
Publisher: name: ETH Zurich
Year: 2023
Subjects: Land Value Capture
Value Increase
Capital Gain
Land-Use Planning
Taxation
Development
Investment

description: Public value capture is an essential phenomenon to improve the refinancing of public infrastructure and secure the necessary budget for other important duties like education, health and social care. For this reason, smart tools are needed for a successful implementation. This book provides an overview and discussion of instruments and practices in 29 European countries.
description: ISBN:978-3-7281-4146-0
description: ISBN:978-3-7281-4147-7
Table S1 from Urban warming reduces aboveground carbon storage
Creators: name: Meineke, Emily
name: Youngsteadt, Elsa
name: Dunn, Robert R.
name: Frank, Steven D.
Publisher: name: The Royal Society
Year: 2016
Subjects: subject: Ecology
subject: FOS: Biological sciences
subject: Plant Biology

description: Timeline of response variable measurements. This shows when treatments were implemented and insect and tree growth and photosynthesis data were collected.
Estimating Perinatal Critical Windows of Susceptibility to Environmental Mixtures via Structured Bayesian Regression Tree Pairs
Creators: name: Mork, Daniel
name: Wilson, Ander
Publisher: name: arXiv
Year: 2021
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Maternal exposure to environmental chemicals during pregnancy can alter birth and children's health outcomes. Research seeks to identify critical windows, time periods when the exposures can change future health outcomes, and estimate the exposure-response relationship. Existing statistical approaches focus on estimation of the association between maternal exposure to a single environmental chemical observed at high-temporal resolution, such as weekly throughout pregnancy, and children's health outcomes. Extending to multiple chemicals observed at high temporal resolution poses a dimensionality problem and statistical methods are lacking. We propose a tree-based model for mixtures of exposures that are observed at high temporal resolution. The proposed approach uses an additive ensemble of structured tree-pairs that define structured main effects and interactions between time-resolved predictors and variable selection to select out of the model predictors not correlated with the outcome. We apply our method in a simulation and the analysis of the relationship between five exposures measured weekly throughout pregnancy and resulting birth weight in a Denver, Colorado birth cohort. We identified critical windows during which fine particulate matter, sulfur dioxide, and temperature are negatively associated with birth weight and an interaction between fine particulate matter and temperature. Software is made available in the R package dlmtree.
description: 22 pages, 3 figures, 3 tables
Rapid Multi-Physics Simulation for Electro-Thermal Origami Systems
Creators: name: Zhu, Yi
name: Filipov, Evgueni T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Electro-thermally actuated origami provides a novel method for creating 3-D systems with advanced morphing and functional capabilities. However, it is currently difficult to simulate the multi-physical behavior of such systems because the electro-thermal actuation and large folding deformations are highly interdependent. In this work, we introduce a rapid multi-physics simulation framework for electro-thermally actuated origami systems that can simultaneously capture: thermo-mechancially coupled actuation, inter panel contact, heat transfer, large deformation folding, and other complex loading applied onto the origami. Comparisons with finite element models validate the proposed framework for simulating origami heat transfer with different system geometries, materials, and surrounding environments. Verification of the simulated folding behaviors against physical electro-thermal micro-origami further demonstrates the validity of the proposed model. Simulations of more complex origami patterns and a case study for origami optimization are provided as application examples to show the capability and efficiency of the model. The framework provides a novel simulation tool for analysis, design, control, and optimization of active origami systems, pushing the boundary for feasible shape morphing and functional capability.
description: This work has been submitted to the International Journal of Mechanical Science
Numerical analysis of a topology optimization problem for Stokes flow
Creators: name: Papadopoulos, Ioannis P. A.
name: Süli, Endre
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: T. Borrvall and J. Petersson [Topology optimization of fluids in Stokes flow, International Journal for Numerical Methods in Fluids 41 (1) (2003) 77--107] developed the first model for topology optimization of fluids in Stokes flow. They proved the existence of minimizers in the infinite-dimensional setting and showed that a suitably chosen finite element method will converge in a weak(-*) sense to an unspecified solution. In this work, we prove novel regularity results and extend their numerical analysis. In particular, given an isolated local minimizer to the infinite-dimensional problem, we show that there exists a sequence of finite element solutions, satisfying necessary first-order optimality conditions, that strongly converges to it. We also provide the first numerical investigation into convergence rates.
Global Phylogeny of the Brassicaceae Provides Important Insights into Gene Discordance
Creators: name: Hendriks, Kasper P.
name: Kiefer, Christiane
name: Al-Shehbaz, Ihsan A.
name: Bailey, C. Donovan
name: Hooft van Huysduynen, Alex
name: Nikolov, Lachezar A.
name: Nauheimer, Lars
name: Zuntini, Alexandre R.
name: German, Dmitry A.
name: Franzke, Andreas
name: Koch, Marcus A.
name: Lysak, Martin A.
name: Toro-Núñez, Óscar
name: Özüdoğru, Barış
name: Invernón, Vanessa R.
name: Walden, Nora
name: Maurin, Olivier
name: Hay, Nikolai M.
name: Shushkov, Philip
name: Mandáková, Terezie
name: Thulin, Mats
name: Windham, Michael D.
name: Rešetnik, Ivana
name: Španiel, Stanislav
name: Ly, Elfy
name: Pires, J. Chris
name: Harkess, Alex
name: Neuffer, Barbara
name: Vogt, Robert
name: Bräuchler, Christian
name: Rainer, Heimo
name: Janssens, Steven B.
name: Schmull, Michaela
name: Forrest, Alan
name: Guggisberg, Alessia
name: Lepschi, Brendan J.
name: Scarlett, Neville
name: Stauffer, Fred W.
name: Schönberger, Ines
name: Heenan, Peter
name: Baker, William J.
name: Forrest, Félix
name: Mummenhoff, Klaus
name: Lens, Frederic
Publisher: name: ETH Zurich
Year: 2022
Subjects: mustard family
Tree of Life
Angiosperms353
coalescence
phylogenomics
taxonomy
info:eu-repo/classification/ddc/580
Botanical sciences

description: The mustard family (Brassicaceae) is a scientifically and economically important family, containing the model plant Arabidopsis thaliana and numerous crop species that feed billions worldwide. Despite its relevance, most published family phylogenies are incompletely sampled, generally contain massive polytomies, and/or show incongruent topologies between datasets. Here, we present the most complete Brassicaceae genus-level family phylogenies to date (Brassicaceae Tree of Life, or BrassiToL) based on nuclear (>1,000 genes, almost all 349 genera and 53 tribes) and plastome (60 genes, 79% of the genera, all tribes) data. We found cytonuclear discordance between nuclear and plastome-derived phylogenies, which is likely a result of rampant hybridisation among closely and more distantly related species, and highlight rogue taxa. To evaluate the impact of this rampant hybridisation on the nuclear phylogeny reconstruction, we performed four different sampling routines that increasingly removed variable data and likely paralogs. Our resulting cleaned subset of 297 nuclear genes revealed high support for the tribes, while support for the main lineages remained relatively low. Calibration based on the 20 most clock-like nuclear genes suggests a late Eocene to late Oligocene ‘icehouse origin’ of the family. Finally, we propose five new or re-established tribes, including the recognition of Arabidopsideae, a monotypic tribe to accommodate Arabidopsis. With a worldwide community of thousands of researchers working on this family, our new, densely sampled family phylogeny will be an indispensable tool to further highlight Brassicaceae as an excellent model family for studies on biodiversity and plant biology.
description: bioRxiv
Discrete Dislocation Dynamics for Crystal RVEs. Part 1: Periodic Loop Kinematics
Creators: name: Pachaury, Yash
name: Po, Giacomo
name: El-Azab, Anter
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A novel implementation of the dislocation flux boundary condition in discrete dislocation dynamics is presented. The continuity of the individual dislocation loops in a periodic representative crystal volume (RVE) is enforced across the boundary of the RVE with the help of a dual topological description for representing dislocation line kinematics in two equivalent spaces representing the deforming crystal, the RVE and the unbounded crystal spaces. The former describes the motion of the dislocations in the simulated crystal RVE whereas the latter represents the motion of dislocations in an infinite space containing all replicas of the RVE. A mapping between the two spaces forms the basis of the implementation of flux boundary condition. The implementation details are discussed in the context of statistical homogeneity of bulk crystals undergoing macroscopically homogeneous plastic deformation. Some test cases are presented and discussed to establish the proposed approach. It has been observed that the boundary nodes associated with dislocation segments bear no relevance in the motion of the dislocation segments from the standpoint of bulk crystal plasticity modeling throughout the deformation history of the crystal.
description: 44 pages, 12 figures
On the conservation of the angular momentum in ultrafast spin dynamics
Creators: name: Simoni, Jacopo
name: Sanvito, Stefano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The total angular momentum of a close system is a conserved quantity, which should remain constant in time for any excitation experiment once the pumping signal has extinguished. Such conservation, however, is never satisfied in practice in any real-time first principles description of the demagnetization process. Furthermore, there is a growing experimental evidence that the same takes place in experiments. The missing angular momentum is usually associated to lattice vibrations, which are not measured experimentally and are never considered in real-time simulations. Here we critically analyse the issue and conclude that current state-of-the-art simulations violate angular momentum conservation already at the electronic level of description. This shortcoming originates from an oversimplified description of the spin-orbit coupling, which includes atomic contributions but neglects completely that of itinerant electrons. We corroborate our findings with time-dependent simulations using model tight-binding Hamiltonians, and show that indeed such conservation can be re-introduced by an appropriate choice of spin-orbit coupling. The consequences of our findings on recent experiments are also discussed.
description: 10 pages, 6 figures
Supplemental information from Dynamic sinking behaviour in marine phytoplankton: rapid changes in buoyancy may aid in nutrient uptake
Creators: name: Gemmell, Brad J.
name: Genesok Oh
name: Buskey, Edward J.
name: Villareal, Tracy A.
Publisher: name: The Royal Society
Year: 2016
Subjects: subject: Ecology
subject: FOS: Biological sciences
subject: 110601 Biomechanics
subject: FOS: Health sciences
subject: 60801 Animal Behaviour

description: Phytoplankton sinking is an important property that can determine community composition in the photic zone and material loss to the deep ocean. To date, studies of diatom suspension have relied on bulk measurements with assumptions that bulk rates adequately capture the essential characteristics of diatom sinking. However, recent work has illustrated that individual diatom sinking rates vary considerably from the mean bulk rate. In this study, we apply high-resolution optical techniques, individual-based observations of diatom sinking and a recently developed method of flow visualization around freely sinking cells. The results show that in both field samples and laboratory cultures some large species of centric diatoms are capable of a novel behaviour whereby cells undergo bursts of rapid sinking that alternate with near-zero sinking rates on the timescales of seconds. We also demonstrate that this behaviour is under direct metabolic control of the cell. We discuss these results in the context of implications for nutrient flux to the cell surface. While nutrient flux in large diatoms increases during fast sinking, current mass transport models cannot incorporate the unsteady sinking behaviour observed in this study. However, large diatoms appear capable of benefiting from the enhanced nutrient flux to their surface during rapid sinking even during brief intervening periods of near-zero sinking rates.
title: Bataille et alliances avec les Karama et les Kodjo
Creators: name: Althabégoity, Galla
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2024
Subjects: subject: ngbugu
subject: lnl

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
title: 03_0572
Creators: name: Wesley Baldwin, John
name: Baldwin, John W.
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: L'ensemble de ces notes ont été crée par John Baldwin lors d'une de ses premières périodes de résidence à Paris. Ces documents comprennent tous les magistri qu’il avait pu rencontrer dans ses sources. Aux XIIème et XIIIème siècles, les universités n'existant pas encore, le titre de magister s'il évoque certainement une compétence n'est pas rattaché de façon systématique au passage par les écoles. De surcroît, les magistris sont le plus souvent désignés par leur seul prénom. La lecture de ces données est donc difficile et suppose un long travail pour tenter d'identifier un individu auquel on pourrait rattacher plusieurs mentions. John Baldwin avait donc renoncé à utiliser ces données pour donner un prolongement à sa magnifique étude sur les gradués d'université et leur emploi par les Capétiens et les Plantagenêts. Néanmoins, il a conservé ces données et elles sont potentiellement très utile dans le cadre de Studium, comme le sont toutes les mentions dans les volumes des Fasti Ecclesiae Gallicanae de chanoines portant ce titre de magister sans autres précisions. L'ampleur des dépouillements rend ces données très utiles et nous devons une grande reconnaissance à John Baldwin pour avoir pris la peine de faire photocopier ses fiches et de nous les avoir transmises amicalement.
Les données ainsi que les images des fiches sont accessibles sur le site Internet à l'adresse suivante : http://studium-baldwin.lamop.fr/.
Les transcriptions des fiches ont été effectuées par des étudiants de Paris 1 Panthéon - Sorbonne mais elles n'ont pas été corrigées par la suite.
description: Relation: https://lamop.hypotheses.org/
Observational constraints and some toy models in $f(Q)$ gravity with bulk viscous fluid
Creators: name: Mandal, Sanjay
name: Parida, Abhishek
name: Sahoo, P. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The standard formulation of general relativity fails to describe some recent interests in the universe. It impels us to go beyond the standard formulation of gravity. The $f(Q)$ gravity theory is an interesting modified theory of gravity, where the gravitational interaction is driven by the nonmetricity $Q$. This study aims to examine the cosmological models with the presence of bulk viscosity effect in the cosmological fluid within the framework of $f(Q)$ gravity. We construct three bulk viscous fluid models, i.e. (i) for the first model, we assuming the Lagrangian $f(Q)$ as linear dependence on $Q$, (ii) for the second model the Lagrangian $f(Q)$ as a polynomial functional form, and (iii) the Lagrangian $f(Q)$ as a logarithmic dependence on $Q$. Furthermore, we use 57 points of Hubble data and 1048 Pantheon dataset to constraint the model parameters. Then, we discuss all the energy conditions for each model, which helps us to test the self-consistency of our models. Finally, we present the profiles of the equation of state parameters to test the models' present status.
description: Universe accepted version
title: 01_2046
Creators: name: Wesley Baldwin, John
name: Baldwin, John W.
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: L'ensemble de ces notes ont été crée par John Baldwin lors d'une de ses premières périodes de résidence à Paris. Ces documents comprennent tous les magistri qu’il avait pu rencontrer dans ses sources. Aux XIIème et XIIIème siècles, les universités n'existant pas encore, le titre de magister s'il évoque certainement une compétence n'est pas rattaché de façon systématique au passage par les écoles. De surcroît, les magistris sont le plus souvent désignés par leur seul prénom. La lecture de ces données est donc difficile et suppose un long travail pour tenter d'identifier un individu auquel on pourrait rattacher plusieurs mentions. John Baldwin avait donc renoncé à utiliser ces données pour donner un prolongement à sa magnifique étude sur les gradués d'université et leur emploi par les Capétiens et les Plantagenêts. Néanmoins, il a conservé ces données et elles sont potentiellement très utile dans le cadre de Studium, comme le sont toutes les mentions dans les volumes des Fasti Ecclesiae Gallicanae de chanoines portant ce titre de magister sans autres précisions. L'ampleur des dépouillements rend ces données très utiles et nous devons une grande reconnaissance à John Baldwin pour avoir pris la peine de faire photocopier ses fiches et de nous les avoir transmises amicalement.
Les données ainsi que les images des fiches sont accessibles sur le site Internet à l'adresse suivante : http://studium-baldwin.lamop.fr/.
Les transcriptions des fiches ont été effectuées par des étudiants de Paris 1 Panthéon - Sorbonne mais elles n'ont pas été corrigées par la suite.
description: Relation: https://lamop.hypotheses.org/
Supplementary Material Figure S2 from Evolution of bacterial recombinase A (recA) in eukaryotes explained by addition of genomic data of key microbial lineages
Creators: name: Hofstatter, Paulo G.
name: Tice, Alexander K.
name: Seungho Kang
name: Brown, Matthew W.
name: Lahr, Daniel J. G.
Publisher: name: The Royal Society
Year: 2016
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: Evolutionary Biology
subject: 60102 Bioinformatics
subject: FOS: Computer and information sciences

description: Uncollapsed Bayesian reconstruction of recA genes surveyed
Supplementary material from Capuchins, space, time and memory: an experimental test of what-where-when memory in wild monkeys
Creators: name: Janson, Charles H.
Publisher: name: The Royal Society
Year: 2016
Subjects: subject: Ecology
subject: FOS: Biological sciences
subject: 170299 Cognitive Science not elsewhere classified
subject: FOS: Psychology
subject: 60801 Animal Behaviour

description: Additional statistical analyses
On the motion of gravity-capillary waves with odd viscosity
Creators: name: Granero-Belinchón, Rafael
name: Ortega, Alejandro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35L75, 35Q35, 35Q31, 35S10, 35R35, 76D03

description: We develop three asymptotic models of surface waves in a non-newtonian fluid with odd viscosity. This viscosity is also known as Hall viscosity and appears in a number of applications such as quantum Hall fluids or chiral active fluids. Besides the odd viscosity effects, these models capture both gravity and capillary forces up to quadratic interactions and take the form of nonlinear and nonlocal wave equations. Two of these models describe bidirectional waves while the third PDE studies the case of unidirectional propagation. We also prove the well-posedness of these asymptotic models in spaces of analytic functions and in Sobolev spaces. Finally, we present a number of numerical simulations for the unidirectional model.
description: 3 figures
Sharp-edge-based acoustofluidic chip for programmable pumping, mixing, cell focusing and trapping
Creators: name: Pavlic, Alen
name: Harshbarger, Cooper
name: Rosenthaler, Luca
name: Snedeker, Jess Gerrit
name: Dual, Jürg
Publisher: name: ETH Zurich
Year: 2022
Subjects: Fluid Dynamics (physics.flu-dyn)
FOS: Physical sciences
Microfluidics
Acoustics

description: Precise manipulation of fluids and objects on the micro scale is seldom a simple task, but nevertheless crucial for many applications in life sciences and chemical engineering. We present a microfluidic chip fabricated in silicon-glass, featuring one or several pairs of acoustically excited sharp edges at side channels that drive a pumping flow throughout the chip and produce a strong mixing flow in their vicinity. The chip is simultaneously capable of focusing cells and microparticles that are suspended in the flow. The multifunctional micropump provides a continuous flow across a wide range of excitation frequencies (80kHz-2MHz), with flow rates ranging from nL/min to $μ$L/min, depending on the excitation parameters. In the low-voltage regime, the flow rate depends quadratically on the voltage applied to the piezoelectric transducer, making the pump programmable. The behaviour in the system is elucidated with finite element method simulations, which are in good agreement with experimentally observed behaviour. The acoustic radiation force arising due to a fluidic channel resonance is responsible for the focusing of cells and microparticles, while the streaming produced by the pair of sharp edges generates the pumping and the mixing flow. If cell focusing is detrimental for a certain application, it can also be avoided by exciting the system away from the resonance frequency of the fluidic channel. The device, with its unique bundle of functionalities, displays great potential for various bio-chemical applications.
Projection-tree reduced order modeling for fast N-body computations
Creators: name: Rodriguez, Steven N.
name: Iliopoulos, Athanasios P.
name: Carlberg, Kevin T.
name: Brunton, Steven L.
name: Steuben, John C.
name: Michopoulos, John G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: This work presents a data-driven reduced-order modeling framework to accelerate the computations of $N$-body dynamical systems and their pair-wise interactions. The proposed framework differs from traditional acceleration methods, like the Barnes-Hut method, which requires online tree building of the state space, or the fast-multipole method, which requires rigorous $a$ $priori$ analysis of governing kernels and online tree building. Our approach combines Barnes-Hut hierarchical decomposition, dimensional compression via the least-squares Petrov-Galerkin (LSPG) projection, and hyper-reduction by way of the Gauss-Newton with approximated tensor (GNAT) approach. The resulting $projection-tree$ reduced order model (PTROM) enables a drastic reduction in operational count complexity by constructing sparse hyper-reduced pairwise interactions of the $N$-body dynamical system. As a result, the presented framework is capable of achieving an operational count complexity that is independent of $N$, the number of bodies in the numerical domain. Capabilities of the PTROM method are demonstrated on the two-dimensional fluid-dynamic Biot-Savart kernel within a parametric and reproductive setting. Results show the PTROM is capable of achieving over 2000$\times$ wall-time speed-up with respect to the full-order model, where the speed-up increases with $N$. The resulting solution delivers quantities of interest with errors that are less than 0.1$\%$ with respect to full-order model.
Nonlinearly Stable Flux Reconstruction High-Order Methods in Split Form
Creators: name: Cicchino, Alexander
name: Nadarajah, Siva
name: Fernández, David C. Del Rey
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: The flux reconstruction (FR) method has gained popularity in the research community as it recovers promising high-order methods through modally filtered correction fields, such as the discontinuous Galerkin method, amongst others, on unstructured grids over complex geometries. Moreover, FR schemes, specifically energy stable FR (ESFR) schemes also known as Vincent-Castonguay-Jameson-Huynh schemes, have proven attractive as they allow for design flexibility as well as stability proofs for the linear advection problem on affine elements. Additionally, split forms have recently seen a resurgence in research activity due to their resultant nonlinear (entropy) stability proofs. This paper derives for the first time nonlinearly stable ESFR schemes in split form that enable nonlinear stability proofs for, uncollocated, modal, ESFR split forms with different volume and surface cubature nodes. The critical enabling technology is applying the splitting to the discrete stiffness operator. This naturally leads to appropriate surface and numerical fluxes, enabling both entropy stability and conservation proofs. When these schemes are recast in strong form, they differ from schemes found in the ESFR literature as the ESFR correction functions are incorporated on the volume integral. Furthermore, numerical experiments are conducted verifying that the new class of proposed ESFR split forms is nonlinearly stable in contrast to the standard split form ESFR approach. Lastly, the new ESFR split form is shown to obtain the correct orders of accuracy.
A dispersion-engineered multi-pass cell for single-stage post compression on an Ytterbium laser
Creators: name: Silletti, Laura
name: Wahid, Ammar Bin
name: Escoto, Esmerando
name: Balla, Prannay
name: Rajhans, Supriya
name: Horn, Katinka
name: Winkelmann, Lutz
name: Wanie, Vincent
name: Trabattoni, Andrea
name: Heyl, Christoph M.
name: Calegari, Francesca
Publisher: name: ETH Zurich
Year: 2022

description: Post-compression methods for ultrafast laser pulses typically face challenging limitations including saturation effects and temporal pulse break-up when large compression factors and broad bandwidths are targeted. To overcome these limitations, we exploit direct dispersion control in a gas-filled multi-pass cell, enabling for the first time single-stage post-compression of 150 fs pulses and up to 250 uJ pulse energy from an Ytterbium (Yb) fiber laser down to sub-20 fs. Dispersion-engineered dielectric cavity mirrors are used to achieve nonlinear spectral broadening dominated by self-phase-modulation over large compression factors and bandwidths at 98% throughput. Our method opens a route towards single-stage post-compression of Yb lasers into the few-cycle regime.
Impact of intrinsic charm amount in the nucleon and saturation effects on the prompt atmospheric $ν_μ$ flux for IceCube
Creators: name: Goncalves, Victor P.
name: Maciula, Rafal
name: Szczurek, Antoni
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The predictions for the atmospheric neutrino flux at high energies strongly depend on the contribution of prompt neutrinos, which are determined by the production of charmed meson in the atmosphere at very forward rapidities. In this paper we estimate the related cross sections taking into account the presence of an intrinsic charm (IC) component in the proton wave function and the QCD dynamics modified by the onset of saturation effects. The impact on the predictions for the prompt neutrino flux is investigated assuming different values for the probability to find the IC in the nucleon. Comparison with the IceCube data is performed and conclusions are drawn.
description: 15 pages, 8 figures
Quasi-Helmholtz Decomposition, Gauss' Laws and Charge Conservation for Finite Element Particle-in-Cell
Creators: name: O'Connor, Scott
name: Crawford, Zane D.
name: Ramachandran, O. H.
name: Luginsland, John
name: Shanker, B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Development of particle in cell methods using finite element based methods (FEMs) have been a topic of renewed interest; this has largely been driven by (a) the ability of finite element methods to better model geometry, (b) better understanding of function spaces that are necessary to represent all Maxwell quantities, and (c) more recently, the fundamental rubrics that should be obeyed in space and time so as to satisfy Gauss' laws and the equation of continuity. In that vein, methods have been developed recently that satisfy these equations and are agnostic to time stepping methods. While is development is indeed a significant advance, it should be noted that implicit FEM transient solvers support an underlying null space that corresponds to a gradient of a scalar potential $\nabla Φ(\textbf{r})$ (or $t \nabla Φ(\textbf{r})$ in the case of wave equation solvers). While explicit schemes do not suffer from this drawback, they are only conditionally stable, time step sizes are mesh dependent, and very small. A way to overcome this bottleneck, and indeed, satisfy all four Maxwell's equation is to use a quasi-Helmholtz formulation on a tessellation. In the re-formulation presented, we strictly satisfy the equation of continuity and Gauss' laws for both the electric and magnetic flux densities. Results demonstrating the efficacy of this scheme will be presented.
description: The following article has been submitted to AIP Physics of Plasmas
title: Les soins
Creators: name: Althabégoity, Galla
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2024
Subjects: subject: ngbugu
subject: lnl

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Individual project on theme «Humulus L.» (MOOC: CompTech in biology)
Creators: name: Starchenko Kirill
Publisher: name: Zenodo
Year: 2024

description: Данный кейс является результатом реализации индивидуального проекта Старченко Кирилла по теме "Humulus L." в рамках онлайн курса "Компьютерные технологии в биологии" (автор – А.В. Ваганов) (https://stepik.org/course/60859/promo)
title: Déplacement du village ngoto
Creators: name: Althabégoity, Galla
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2024
Subjects: subject: ngbugu
subject: lnl

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Imaging three phases of Iodine on Ag (111) using low-temperature scanning tunneling microscopy
Creators: name: Dreyer, Michael
name: Murray, Joseph
name: Butera, Robert E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigated the adsorption of iodine on silver (111) in ultra-high vacuum. Using low-temperature scanning tunneling microscopy (LT-STM) measurements we catalog the complex surface structures on the local scale. We identified three distinct phases with increasing iodine coverage which we tentatively associate with three phases previously reported in LEED experiments (sqrt(3)x sqrt(3)R30, "triangular", "hexagonal"). We used Fourier space and real space analysis to fully characterize each phase. While Fourier analysis most easily connects our measurements to previous LEED studies, the real space inspection reveals local variations in the superstructures of the "hexagonal" and "triangular" phase. The latter, observed here for the first time by LT-STM, stabilized by one or two adatoms sitting at the center of a rosette-like iodine reconstruction. The most stunning discovery is that variation in the adatom separation of the "triangular" phase reconstruct the Ag (111) surface lattice.
description: 15 pages, 29 figures
Crossin & Williams Supplementary Materials Table from Migratory life histories explain the extreme egg-size dimorphism of Eudyptes penguins
Creators: name: Crossin, Glenn T.
name: Williams, Tony D.
Publisher: name: The Royal Society
Year: 2016
Subjects: subject: Physiology
subject: FOS: Biological sciences
subject: Evolutionary Biology

description: When successive stages in the life history of an animal directly overlap, physiological conflicts can arise resulting in carryover effects from one stage to another. The extreme egg-size dimorphism (ESD) of Eudyptes penguins, where the first laid A-egg is approximately 18–57% smaller than the second laid B-egg, has interested researchers for decades. Recent studies have linked variation in this trait to a carryover effect of migration that limits the physiology of yolk production and egg sizes. We assembled the data on ESD and estimates of migration–reproduction overlap in penguin species and use phylogenetic methods to test the idea that migration–reproduction overlap explains variation in ESD. We show that migration overlap is generally restricted to Eudyptes relative to non-Eudyptes penguins, and that this overlap (defined as the amount of time that egg production occurs on land versus at sea during homeward migration) is significantly and positively correlated with the degree of ESD in Eudyptes. In the non-Eudyptes species however, ESD was unrelated to migration overlap as these species mostly produce their clutches on land. Our results support the recent hypothesis that extreme ESD of Eudyptes penguins evolved, in part, in response to selection for a pelagic overwinter migration behaviour. This resulted in a temporal overlap, and thus a constraint on, the physiology of follicle development, leading to smaller A-egg size and greater ESD.
A Surrogate Modeling Approach for Rocking-Flexure Interaction
Creators: name: Silva, Andréia
name: Stojadinovic, Bozidar
Publisher: name: ETH Zurich
Year: 2021
Subjects: rocking
rocking-flexure interaction
uplifting

description: Uplift of a structure is a seismic isolation technique: it works as a structural fuse limiting the maximum base moment (rocking foundation) or base shear (rocking podium) transferred to the foundation. To use uplifting in seismic design, the interaction between rocking and flexure must be understood well. Ideally, surrogate models to predict the seismic response of such systems should be also available to facilitate design. This paper presents the equations of motion of a building mounted on a rocking foundation and on a rocking podium in modal coordinates, then surrogate models are developed by applying component mode synthesis. Analytical equations for calculating the uplifted frequency and modal shapes are derived and used to compare how uplift affects both systems.In the following, it is shown that the overturning moment in both systems is dominated by the first mode, therefore a surrogate model with two degrees of freedom (2DOF surrogate), namely the rocking angle and the first mode coordinate, is considered adequate to represent the entire system. Finally, a hundred different buildings, with varying periods, aspect ratios and number of stories, are generated and the maximum dynamic response of the complete system is compared to the 2DOF surrogate ones, the coefficient of determination between all the responses is greater than 0.81 for all cases, thus the 2DOF surrogate is considered adequate to represent the response of the full model.
description: engrXiv
Pesoassist publication
Creators: name: Morris, Julia
Publisher: name: Zenodo
Year: 2020
Subjects: money
cash
loan

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Hardy-like Quantum Pigeonhole Paradox and the Projected-Coloring Graph State
Creators: name: Tang, Weidong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A Hardy-like version of the quantum pigeonhole paradox is proposed, which can also be considered as a special kind of Hardy's paradox. Besides an example induced from the minimal system, a general construction of this paradox from an $n$-qubit quantum state is also discussed. Moreover, by introducing the projected-coloring graph and the projected-coloring graph state, a pictorial representation of the Hardy-like quantum pigeonhole paradox can be presented. This Hardy-like version of quantum pigeonhole paradox can be implemented more directly in the experiment than the original one, since it does not require some sophisticated techniques such as weak measurements. In addition, from the angle of Hardy's paradox, some Hardy-like quantum pigeonhole paradoxes can even set a new record for the success probability of demonstrating Bell nonlocality.
description: 8 pages, 2 figures, a revised version
A restricted additive Vanka smoother for geometric multigrid
Creators: name: Saberi, S.
name: Meschke, G.
name: Vogel, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65N55, 65N30, 76D07

description: The solution of saddle-point problems, such as the Stokes equations, is a challenging task, especially in large-scale problems. Multigrid methods are one of the most efficient solvers for such systems of equations and can achieve convergence rates independent of the problem size. The smoother is a crucial component of multigrid methods and significantly affects its overall efficiency. We propose a Vanka-type smoother that we refer to as Restricted Additive Vanka and investigate its convergence in the context of adaptive geometric multigrid methods for the Stokes equations. The proposed smoother has the advantage of being an additive method and provides favorable properties in terms of algorithmic complexity, scalability and applicability to high-performance computing. We compare the performance of the smoother with two variants of the classical Vanka smoother using numerical benchmarks for the Stokes problem. We find that the restricted additive smoother achieves comparable convergence rates to the classical multiplicative Vanka smoother while being computationally less expensive per iteration, which results in faster solution runtimes.
Individual project on theme "Triticum L." (MOOC: CompTech in biology)
Creators: name: Chernyshev, Kirill
Publisher: name: Zenodo
Year: 2024

description: Данный кейс является результатом реализации индивидуального проекта Кирилла Чернышева по теме "Triticum L." в рамках онлайн курса "Компьютерные технологии в биологии" (автор – А.В. Ваганов) (https://stepik.org/course/60859/promo)