cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Mixed-dimensional coupled finite elements in FEniCS
Creators: name: Daversin-Catty, Cécile
name: Rognes, Marie E.
Publisher: name: Zenodo
Year: 2018

description: Mixed-dimensional partial differential equations (PDEs) are equations coupling unknown fields defined over domains of differing topological dimension. Such mixed-dimensional PDEs naturally arise in a wide range of fields including geology, bio-medicine, and fracture mechanics. In the brain, the blood vessels and paravascular spaces play a important role in the circulation, flow and exchange of tissue fluid. This process can be investigated via a mathematical approach based on coupled mixed-dimensional models mimicking the vasculature as topologically one-dimensional structures embedded in a three-dimensional
 porous medium. The FEniCS project aims at automating the numerical solution of mathematical models based on PDEs using finite element methods, and is organized as an open source collection of software components. A core feature is a high-level domain-specific language for finite element spaces and variational forms close to mathematical syntax. Finite element discretizations of mixed-dimensional PDEs involve nested meshes of heterogeneous topological dimension and typically require specific averaging operators. The assembly of such systems is non-standard and non-trivial especially with regard to the terms involved in the interactions between the different domains. In other words, automated solution of mixed-dimensional PDEs requires the design of both generic high level software abstractions and lower level algorithms. In this talk, we present a set of features developed as part of an automated framework dedicated to such problems in the FEniCS Project framework. The introduced tools will
 be illustrated by concrete examples of applications highlighting their relevance for model in biomedicine in general and for the brain’s waterscape in particular.
The 2010 M 87 VHE flare and its origin: the multi-wavelength picture
Creators: name: Raue, M.
name: Stawarz, L.
name: Mazin, D.
name: Colin, P.
name: Hui, C. M.
name: Beilicke, M.
name: McConville, M.
name: Giroletti, M.
name: Harris, D. E.
name: Steele, I. A.
name: Walker, R. C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The giant radio galaxy M 87, with its proximity (16 Mpc) and its very massive black hole ((3 - 6) \times 10^9 M_solar), provides a unique laboratory to investigate very high energy (E>100 GeV; VHE) gamma-ray emission from active galactic nuclei and, thereby, probe particle acceleration to relativistic energies near supermassive black holes (SMBH) and in relativistic jets. M 87 has been established as a VHE gamma-ray emitter since 2005. The VHE gamma-ray emission displays strong variability on timescales as short as a day. In 2008, a rise in the 43 GHz Very Long Baseline Array (VLBA) radio emission of the innermost region (core; extension of < 100 Rs ; Schwarzschild radii) was found to coincide with a flaring activity at VHE. This had been interpreted as a strong indication that the VHE emission is produced in the direct vicinity of the SMBH. In 2010 a flare at VHE was again detected triggering further multi-wavelength (MWL) observations with the VLBA, Chandra, and other instruments. At the same time, M 87 was also observed with the Fermi-LAT telescope at MeV/GeV energies, the European VLBI Network (EVN), and the Liverpool Telescope (LT). Here, preliminary results from the 2010 campaign will be reported.
description: 6 pages, 2 figures; Procceedings of the workshop "High Energy Phenomena in Relativistic Outflows III" (HEPRO III), Barcelona, June 27 - July 1, 2011
Emittance Mapping in rf Guns
Creators: name: Sims, Benjamin
name: Baryshev, Sergey V.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: This paper discusses the trends and trade-offs between transverse sigma x and longitudinal sigma z bunch dimensions, rf injector gradient, bunch charge, and intrinsic electron mean transverse energy (MTE), where all can be chosen to be independent, and the resulting effects on emittance and transverse brightness. Using a practical example of a quarter wave normal conducting photoinjector, it is computationally found that regardless of MTE and bunch charge, there is a universal relation between the gradient E and the aspect ratio of the bunch (sigma x /sigma z ) leading to the highest brightness. This computational result is understood using an analytical formalism consisting of K J Kim's emittance formulation and a two-dimensional space charge model. The results, obtained computationally and interpreted in a robust physical framework, could therefore provide the basis for an express mapping approach for emittance forecasting when used with practical injector system design requirements and limitations.
Noise in the LIGO Livingston Gravitational Wave Observatory due to Trains
Creators: name: Glanzer, Jane
name: Soni, Siddharth
name: Spoon, Jaidyn
name: Effler, Anamaria
name: González, Gabriela
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Environmental seismic disturbances limit the sensitivity of LIGO gravitational wave detectors. Trains near the LIGO Livingston detector produce low frequency (0.5-10 Hz) ground noise that couples into the gravitational wave sensitive frequency band (10-100 Hz) through light reflected in mirrors and other surfaces. We investigate the effect of trains during the Advanced LIGO third observing run, and propose a method to search for narrow band seismic frequencies responsible for contributing to increases in scattered light. Through the use of the linear regression tool Lasso (least absolute shrinkage and selection operator) and glitch correlations, we identify the most common seismic frequencies that correlate with increases in detector noise as 0.6-0.8 Hz, 1.7-1.9 Hz, 1.8-2.0 Hz, and 2.3-2.5 Hz in the LIGO Livingston corner station.
description: 18 pages (including bibliography), 17 figures, 2 tables, and 1 appendix. Submitted to Classical and Quantum Gravity
A new approach for improving global critical current density in Fe(Se0.5Te0.5) polycrystalline materials
Creators: name: Palenzona, A.
name: Sala, A.
name: Bernini, C.
name: Braccini, V.
name: Cimberle, M. R.
name: Ferdeghini, C.
name: Lamura, G.
name: Martinelli, A.
name: Pallecchi, I.
name: Romano, G.
name: Tropeano, M.
name: Fittipaldi, R.
name: Vecchione, A.
name: Polyanskii, A.
name: Kametani, F.
name: Putti, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences
subject: 82D55

description: A novel method to prepare bulk Fe(Se0.5Te0.5) samples is presented, based on a melting process and a subsequent annealing treatment. With respect to the standard sintering technique, it produces much more homogeneous and denser samples, characterized by large and well interconnected grains. The resulting samples exhibit optimal critical temperature values, sharp resistive and magnetic transitions, large magnetic hysteresis loops and high upper critical fields are observed. Interestingly, the global critical current density is much enhanced as compared to the values reported in literature for bulk samples of the same 11 family, reaching about 103 A/cm2 at zero field at 4.2 K as assessed by magnetic, transport and magneto-optical techniques. Even more importantly, its field dependence turns out to be very weak, such that at μ_{0}H = 7 T it is suppressed only by a factor \sim2.
description: 21 pages, 15 figures
Energy-Efficient Lane Changes Planning and Control for Connected Autonomous Vehicles on Urban Roads
Creators: name: Joa, Eunhyek
name: Lee, Hotae
name: Choi, Eric Yongkeun
name: Borrelli, Francesco
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper presents a novel energy-efficient motion planning algorithm for Connected Autonomous Vehicles (CAVs) on urban roads. The approach consists of two components: a decision-making algorithm and an optimization-based trajectory planner. The decision-making algorithm leverages Signal Phase and Timing (SPaT) information from connected traffic lights to select a lane with the aim of reducing energy consumption. The algorithm is based on a heuristic rule which is learned from human driving data. The optimization-based trajectory planner generates a safe, smooth, and energy-efficient trajectory toward the selected lane. The proposed strategy is experimentally evaluated in a Vehicle-in-the-Loop (VIL) setting, where a real test vehicle receives SPaT information from both actual and virtual traffic lights and autonomously drives on a testing site, while the surrounding vehicles are simulated. The results demonstrate that the use of SPaT information in autonomous driving leads to improved energy efficiency, with the proposed strategy saving 37.1% energy consumption compared to a lane-keeping algorithm.
description: IEEE Intelligent Vehicle Symposium, Anchorage, Alaska, June 4-7, 2023
Reading and Discussing Teaching and Learning: A Book Club Experience
Creators: name: Jeffs, Cheryl
Publisher: name: Educational Development Unit
Year: 2015

description: L Dee Fink released a new edition of Creating Significant Learning Experiences (2013), with the message that, “the whole point of this book is to offer ideas that can improve the way teaching is usually practiced in higher education” (p. xii). The challenge to those who want to meaningfully read and learn from this 334 page book, is described by Caster and Hautala (2008), is that of time and balance. They also provide evidence that a book club is an opportunity for learning, and helps to address the challenges. Levin et al. (2007) suggest the knowledge gained from book group discussions can be shared with others, and provide a model for others to adopt the book club format. Williams et al. (2013) describe this as increasing the opportunity to build networks to enhance teaching and learning. With the idea to bring together a university community to explore teaching and learning issues, a book club was established, and Fink’s book was selected. The popularity of this format was quickly embraced by faculty, graduate students and staff from across disciplines, to discuss Fink’s ideas on teaching, and explore potential applications of the text. Topics were identified, face-to-face meetings were scheduled, and a discussion board was created in the online learning management system (D2L). A facilitator organized the group, monitored the D2L site, and Barthelmess (2014) guidelines for good book club discussion were adopted. This poster will present the process, format, membership, and experiences, with implications for applications and future development.
A critical discourse analysis of the standards for the education, competence and professional conduct of educators in British Columbia
Creators: name: Higgins, Christine Lorna
Publisher: name: University of British Columbia
Year: 2010

description: This dissertation examines discourses of professionalism and teacher education reform by carrying out a Critical Discourse Analysis of the British Columbia College of Teacher’s Standards for the education, competence and professional conduct of educators in British Columbia (BCCT, 2004). The broader context of the dissertation is the evolution of competing notions of professionalism in teacher education in Canada and the United States in the decades following the release of the influential policy report, A Nation at Risk (NCEE, 1983). It is argued that a more perspicuous understanding of professionalism in teaching will help prospective and practicing educators make better sense of their professional responsibilities, and will also encourage educators to enter into the ongoing discussions about appropriate directions for teacher education reform. The study takes the form of a critical discourse analysis (CDA). CDA is an interdisciplinary form of qualitative research that treats language as a social practice, and interprets texts in accordance with concepts such as discourse, power, and knowledge creation (Fairclough, 1995; Foucault, 1970; Habermas, 1970). The research utilizes the methods provided in Fairclough’s (1995, 2003) three step model of CDA to first describe, then interpret, and finally, to explain the relationships between understandings of professionalism and reform as these are taken up in the Standards text. The key finding from the study is that the term professionalism as it appears in the Standards is part of a discourse best understood in light of the tensions between various conceptions of educators’ responsibilities in an age of accountability. These various and often competing notions of responsibility are intertwined with genres of texts that are described as codes of conduct, manifestos, and standards. Contested perspectives on professionalism are interconnected with offers of membership, stipulations of governance, and regulatory pacts concerning educators’ professional obligations. In conclusion, it is argued that educators’ obligations should be framed in terms of ethical commitments, and specifically as a continual search for balance between notions of individual moral responsibility and professional accountability as defined in such documents as the Standards for the education, competence and professional conduct of educators in British Columbia.
Supplementary Material for "Bots for Pull Requests: The Good, the Bad, and the Promising"
Creators: name: Anonymous
Publisher: name: Zenodo
Year: 2021

description: This package includes the main data of "Bots for Pull Requests: The Good, the Bad, and the Promising." The files' organization is as follows: Design fiction code book (.PDF) - codebook created from design fiction sessions analysis. Design fiction video (.MP4) - 3-minute animated video used during the design fiction sessions. Fictional story (.PDF) - describe the fictional story used to create the 3-minute animated video. Session instrument (.PDF) - contains the instrument used to guide de design fiction sessions. Suitability study code book (.PDF) - codebook created from the suitability study analysis. TAM scale items (.PDF) - shows our assessment model which was adapted from previous literature.
Modal-graph 3D shape servoing of deformable objects with raw point clouds
Creators: name: Yang, Bohan
name: Sui, Congying
name: Zhong, Fangxun
name: Liu, Yun-Hui
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Deformable object manipulation (DOM) with point clouds has great potential as non-rigid 3D shapes can be measured without detecting and tracking image features. However, robotic shape control of deformable objects with point clouds is challenging due to: the unknown point-wise correspondences and the noisy partial observability of raw point clouds; the modeling difficulties of the relationship between point clouds and robot motions. To tackle these challenges, this paper introduces a novel modal-graph framework for the model-free shape servoing of deformable objects with raw point clouds. Unlike the existing works studying the object's geometry structure, our method builds a low-frequency deformation structure for the DOM system, which is robust to the measurement irregularities. The built modal representation and graph structure enable us to directly extract low-dimensional deformation features from raw point clouds. Such extraction requires no extra point processing of registrations, refinements, and occlusion removal. Moreover, to shape the object using the extracted features, we design an adaptive robust controller which is proved to be input-to-state stable (ISS) without offline learning or identifying both the physical and geometric object models. Extensive simulations and experiments are conducted to validate the effectiveness of our method for linear, planar, tubular, and solid objects under different settings.
description: This paper has been accepted by the International Journal of The International Journal of Robotics Research. SAGE copyright
Triaxial Shapes in the Interacting Vector Boson Model
Creators: name: Ganev, H. G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A new dynamical symmetry limit of the two-fluid Interacting Vector Boson Model (IVBM), defined through the chain $Sp(12,R) \supset U(3,3) \supset U^{\ast}(3) \otimes SU(1,1) \supset SU^{\ast}(3) \supset SO(3)$, is introduced. The $SU^{\ast}(3)$ algebra considered in the present paper closely resembles many properties of the $SU^{\ast}(3)$ limit of IBM-2, which have been shown by many authors geometrically to correspond to the rigid triaxial model. The influence of different types of perturbations on the $SU^{\ast}(3)$ energy surface, in particular the addition of a Majorana interaction and an O(6) term to the model Hamiltonian, is studied. The effect of these perturbations results in the formation of a stable triaxial minimum in the energy surface of the IVBM Hamiltonian under consideration. Using a schematic Hamiltonian which possesses a perturbed $SU^{\ast}(3)$ dynamical symmetry, the theory is applied for the calculation of the low-lying energy spectrum of the nucleus $^{192}$Os. The theoretical results obtained agree reasonably with the experimental data and show a very shallow triaxial minimum in the energy surface for the ground state in $^{192}$Os, suggesting that the newly proposed dynamical symmetry might be appropriate for the description of the collective properties of different nuclei, exhibiting triaxial features.
description: 10 pages, 9 figures
A Versatile Low-Complexity Feedback Scheme for FDD Systems via Generative Modeling
Creators: name: Turan, Nurettin
name: Fesl, Benedikt
name: Koller, Michael
name: Joham, Michael
name: Utschick, Wolfgang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We propose a versatile feedback scheme for both single- and multi-user multiple-input multiple-output (MIMO) frequency division duplex (FDD) systems. Particularly, we propose utilizing a Gaussian mixture model (GMM) with a reduced number of parameters for codebook construction, feedback encoding, and precoder design. The GMM is fitted offline at the base station (BS) to uplink training samples to approximate the channel distribution of all possible mobile terminals (MTs) within the BS cell. Subsequently, a codebook is constructed, with each element based on one GMM component. Extracting directional information from the codebook or exploiting the GMM's sample generation ability facilitates joint precoder design for a multi-user MIMO system using state-of-the-art precoding algorithms. After offloading the GMM to the MTs, they can easily determine their feedback by selecting the index of the GMM component with the highest responsibility for their received pilot signal. This strategy exhibits low complexity and supports parallelization. Simulations demonstrate that the proposed approach outperforms conventional methods, which either estimate the channel and utilize a Lloyd codebook or use a deep neural network to determine the feedback in terms of spectral efficiency or sum-rate. The performance gains can be exploited to deploy systems with fewer pilots or feedback bits.
description: Copyright IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. See https://www.ieee.org/publications/rights/index.html for more information
hotSSDS and hotSSDS-extra pipelines Singularity images
Creators: name: AUFFRET, Pauline
name: CLEMENT, Julie A.J.
Publisher: name: Zenodo
Year: 2023

description: Singularity images required to run hotSSDS and hotSSDS-extra pipelines. See https://github.com/jajclement/ssdsnextflowpipeline/tree/master
Structure and electronic structure of Metal-Organic Frameworks within the Density-Functional based Tight-Binding method
Creators: name: Lukose, Binit
name: Supronowicz, Barbara
name: Petkov, Petko St.
name: Frenzel, Johannes
name: Kuc, Agnieszka B.
name: Seifert, Gotthard
name: Vayssilov, Georgi N.
name: Heine, Thomas
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Density-functional based tight-binding is a powerful method to describe large molecules and materials. Metal-Organic Frameworks (MOFs), materials with interesting catalytic properties and with very large surface areas have been developed and have become commercially available. Unit cells of MOFs typically include hundreds of atoms, which make the application of standard Density-Functional methods computationally very expensive, sometimes even unfeasible. The aim of this paper is to prepare and to validate the Self-Consistent Charge Density-Functional based Tight Binding (SCC-DFTB) method for MOFs containing Cu, Zn and Al metal centers. The method has been validated against full hybrid density-functional calculations for model clusters, against gradient corrected density-functional calculations for supercells, and against experiment. Moreover, the modular concept of MOF chemistry has been discussed on the basis of their electronic properties. We concentrate on MOFs comprising three common connector units: copper paddlewheels (HKUST-1), zinc oxide Zn4O tetrahedron (MOF-5, MOF-177, DUT-6 (MOF-205)) and aluminium oxide AlO4(OH)2 octahedron (MIL-53). We show that SCC-DFTB predicts structural parameters with a very good accuracy (with less than 5% deviation, even for adsorbed CO and H2O on HKUST-1), while adsorption energies differ by 12 kJ mol-1 or less for CO and water compared to DFT benchmark calculations.
description: Submitted to Phys. Status Solidi C
Modeling Regulation of Zinc Uptake via ZIP Transporters in Yeast and Plant Roots
Creators: name: Claus, Juliane
name: Chavarría-Krauser, Andrés
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cell Behavior (q-bio.CB)
subject: FOS: Biological sciences

description: In yeast (Saccharomyces cerevisiae) and plant roots (Arabidopsis thaliana) zinc enters the cells via influx transporters of the ZIP family. Since zinc is both essential for cell function and toxic at high concentrations, tight regulation is essential for cell viability. We provide new insight into the underlying mechanisms, starting from a general model based on ordinary differential equations and adapting it to the specific cases of yeast and plant root cells. In yeast, zinc is transported by the transporters ZRT1 and ZRT2, which are both regulated by the zinc-responsive transcription factor ZAP1. Using biological data, parameters were estimated and analyzed, confirming the different affinities of ZRT1 and ZRT2 reported in the literature. Furthermore, our model suggests that the positive feedback in ZAP1 production has a stabilizing function at high influx rates. In plant roots, various ZIP transporters are involved in zinc uptake. Their regulation is largely unknown, but bZIP transcription factors are thought to be involved. We set up three putative models: activator only, activator with dimerization and activator/inhibitor. These were fitted to measurements and analyzed. Simulations show that the activator/inhibitor model outperforms the other two in providing robust and stable homeostasis at reasonable parameter ranges.
description: 23 pages including 2 tables and 7 figures
Modeling of ac machines using a voltage-behind-reactance formulation for simulation of electromagnetic transients in power systems
Creators: name: Wang, Liwei
Publisher: name: University of British Columbia
Year: 2010

description: Modeling of electrical machines for power system’s electromagnetic transient programs (EMTP) has been an active area of research since the late 1970s. Most machine models are based on the qd reference frame. The phase-domain (PD) model was also proposed wherein the direct interface with the external network is achieved at a price of increased the computational cost. This thesis focuses on improving the numerical efficiency and accuracy of machine models for power systems transient simulation. The modeling approach developed in this thesis is based on the so-called voltage-behind-reactance (VBR) formulation. The new VBR models of synchronous and induction machines are proposed for EMTP-type solution. It is shown that the proposed VBR models significantly improve the overall numerical accuracy and efficiency, compared with the traditional qd and PD models, due to the direct machine-network interface and better-scaled eigenvalues. The proposed model implementations require as little as 240 flops for synchronous and 108 flops for induction machines, per time-step, respectively. This amounts to 3.75 microseconds and 1.6 microseconds (per time-step) of the CPU time on a modest personal computer and represents a significant improvement over existing EMTP machine models. Magnetic saturation has been incorporated into the VBR models for EMTP-type solution. Computer studies demonstrate that the proposed saturable VBR model in addition of being very efficient also preserves good numerical accuracy and stability even at very large time step. A new full-order VBR induction machine model is also proposed for state-variable simulation languages. Computer studies demonstrate that the proposed models achieve a 740% improvement in computational efficiency as compared with the coupled-circuit models used in state-variable simulation languages. Finally, an approximate VBR induction machine model is proposed for the discretized EMTP solution wherein a constant equivalent conductance matrix is achieved. This further improves the efficiency of the machine-network solution since it avoids the re-factorization of the network conductance matrix at every time step. It is envisioned by the author that due to structural and numerical advantages, the proposed VBR models will find wide application in simulation packages and tools widely used in the power industry.
Comment on "The New F_L Measurement from HERA and the Dipole Model"
Creators: name: Schildknecht, Dieter
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The upper bound on the ratio of the proton structure functions $F_L/F_2$ tested in the recent paper "The New $F_L$ Measurement from HERA and the Dipole Model", contrary to what is said therein, does not provide a model-independent "rigorous" experimental test of the color-dipole picture. The validity of the theoretical upper bound depends on an ad hoc assumption on the dipole cross section. -- The analysis in the paper "The New $F_L$ Measurement from HERA and the Dipole Model" can be reinterpreted as an additional confirmation of the absolute model-independent prediction from the color-dipole picture of $F_L = 0.27 F_2$.
pyPESTO: A modular and scalable tool for parameter estimation for dynamic models
Creators: name: Schälte, Yannik
name: Fröhlich, Fabian
name: Jost, Paul J.
name: Vanhoefer, Jakob
name: Pathirana, Dilan
name: Stapor, Paul
name: Lakrisenko, Polina
name: Wang, Dantong
name: Raimúndez, Elba
name: Merkt, Simon
name: Schmiester, Leonard
name: Städter, Philipp
name: Grein, Stephan
name: Dudkin, Erika
name: Doresic, Domagoj
name: Weindl, Daniel
name: Hasenauer, Jan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Computation (stat.CO)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: Mechanistic models are important tools to describe and understand biological processes. However, they typically rely on unknown parameters, the estimation of which can be challenging for large and complex systems. We present pyPESTO, a modular framework for systematic parameter estimation, with scalable algorithms for optimization and uncertainty quantification. While tailored to ordinary differential equation problems, pyPESTO is broadly applicable to black-box parameter estimation problems. Besides own implementations, it provides a unified interface to various popular simulation and inference methods. pyPESTO is implemented in Python, open-source under a 3-Clause BSD license. Code and documentation are available on GitHub (https://github.com/icb-dcm/pypesto).
Time Dependence of Advection Dominated Accretion Flow with a Toroidal Magnetic Field
Creators: name: Khesali, Alireza
name: Faghei, Kazem
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The present study examines self-similarity evolution of advection dominated accretion flow (ADAF) in the presence of a toroidal magnetic field. In this research, it was assumed that the angular momentum transport is due to viscous turbulence and $α$-prescription was used for kinematics coefficient of viscosity. In order to solve the integrated equations which govern the dynamical behavior of the accretion flow, self-similar solution was used. The solutions show that the behavior of physical quantities in a dynamical ADAF are different from steady accretion flow and a disk with polytropic approach. The solution indicates a transonic point in the accretion flow for all selected amounts of advection parameter. Also, by adding strength of the magnetic field and the degree of advection, the radial-thickness of the disk decreased and the disk compressed. The model implies that the flow has differential rotation and is sub-Keplerian at small radii and is super-Keplerian in large radii.
description: 7 pages, 4 figures, accepted by MNRAS
The Memory of Colonialism in Britain and France. The Sins of Silence
Creators: name: Cerdeira, Pedro
Publisher: name: Práticas da História. Journal on Theory, Historiography and Uses of the Past
Year: 2023

description: Recensão a Itay Lotem, The Memory of Colonialism in Britain and France. The Sins of Silence. Cham: Palgrave Macmillan, 2021, 428 pp.
description: Práticas da História. Journal on Theory, Historiography and Uses of the Past, N.º 15 (2022)
Postcolonial People. The Return from Africa and the Remaking of Portugal
Creators: name: Peralta, Elsa
Publisher: name: Práticas da História. Journal on Theory, Historiography and Uses of the Past
Year: 2023

description: Recensão a Christoph Kalter, Postcolonial People. The Return from Africa and the Remaking of Portugal. Cambridge: Cambridge University Press, 2022, 351 pp.
description: Práticas da História. Journal on Theory, Historiography and Uses of the Past, N.º 15 (2022)
Unilateral interactions in granular packings: A model for the anisotropy modulus
Creators: name: Shaebani, M. Reza
name: Boberski, Jens
name: Wolf, Dietrich E.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Unilateral interparticle interactions have an effect on the elastic response of granular materials due to the opening and closing of contacts during quasi-static shear deformations. A simplified model is presented, for which constitutive relations can be derived. For biaxial deformations the elastic behavior in this model involves three independent elastic moduli: bulk, shear, and anisotropy modulus. The bulk and the shear modulus, when scaled by the contact density, are independent of the deformation. However, the magnitude of the anisotropy modulus is proportional to the ratio between shear and volumetric strain. Sufficiently far from the jamming transition, when corrections due to non-affine motion become weak, the theoretical predictions are qualitatively in agreement with simulation results.
description: 6 pages, 5 figures
Application of Gammachirp Auditory Filter as a Continuous Wavelet Analysis
Creators: name: Salhi, Lotfi
name: Ouni, Kais
Publisher: name: arXiv
Year: 2011
Subjects: subject: Sound (cs.SD)
subject: FOS: Computer and information sciences

description: This paper presents a new method on the use of the gammachirp auditory filter based on a continuous wavelet analysis. The gammachirp auditory filter is designed to provide a spectrum reflecting the spectral properties of the cochlea, which is responsible for frequency analysis in the human auditory system. The impulse response of the theoretical gammachirp auditory filter that has been developed by Irino and Patterson can be used as the kernel for wavelet transform which approximates the frequency response of the cochlea. This study implements the gammachirp auditory filter described by Irino as an analytical wavelet and examines its application to a different speech signals. The obtained results will be compared with those obtained by two other predefined wavelet families that are Morlet and Mexican Hat. The results show that the gammachirp wavelet family gives results that are comparable to ones obtained by Morlet and Mexican Hat wavelet family.
description: 16 pages, 17 figures; http://airccse.org/journal/sipij/papers/2011sipij10.pdf
Constraining $p$-wave Dark Matter Annihilation with Gamma-ray Observations of M87
Creators: name: Christy, Katharena
name: Kumar, Jason
name: Sandick, Pearl
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We consider constraints on $p$-wave dark matter in a dark matter spike surrounding the supermassive black hole at the center of M87. Owing to the large mass of the black hole, and resulting large velocity dispersion for the dark matter particles in the spike, it is possible for Fermi-LAT and MAGIC data to place tight constraints on $p$-wave annihilation, which would be far more stringent than those placed by observations of dwarf spheroidal galaxies. Indeed, for optimistic choices of the spike parameters, gamma-ray data would exclude thermal $p$-wave dark matter models with a particle mass $\lesssim {10}~\rm TeV$. But there is significant uncertainty in the properties and parameters of the spike, and for less optimistic scenarios, thermal dark matter candidates would be completely unconstrained. In addition to better understanding the spike parameters, a second key to improving constraints on dark matter annihilation is an accurate astrophysical background model.
description: 10 pages, 4 figures; updated to match version accepted by PRD
A New Round Robin Based Scheduling Algorithm for Operating Systems: Dynamic Quantum Using the Mean Average
Creators: name: Noon, Abbas
name: Kalakech, Ali
name: Kadry, Seifedine
Publisher: name: arXiv
Year: 2011
Subjects: subject: Operating Systems (cs.OS)
subject: FOS: Computer and information sciences
subject: B.1.5
subject: 68N25

description: Round Robin, considered as the most widely adopted CPU scheduling algorithm, undergoes severe problems directly related to quantum size. If time quantum chosen is too large, the response time of the processes is considered too high. On the other hand, if this quantum is too small, it increases the overhead of the CPU. In this paper, we propose a new algorithm, called AN, based on a new approach called dynamic-time-quantum; the idea of this approach is to make the operating systems adjusts the time quantum according to the burst time of the set of waiting processes in the ready queue. Based on the simulations and experiments, we show that the new proposed algorithm solves the fixed time quantum problem and increases the performance of Round Robin.
description: 6 pages, 4 figures
Improved Handling of Dairy Products in Retail Food Stores
Creators: name: Flynn, Gordon
name: Flynn, Gordon
Publisher: name: Unknown
Year: 1964
Subjects: subject: Labor and Human Capital
subject: Marketing
subject: FOS: Economics and business
subject: Production Economics
subject: Research and Development/Tech Change/Emerging Technologies

description: Excerpts from the report: The objective of this study was to evaluate dairy handling techniques, different types of equipment, and to develop improved methods of ordering, receiving, price marking, and displaying dairy items in retail food stores. Detailed analysis was made of all dairy labor requirements and time standards were established by item and by function. Improved methods were developed, measured, and the results compared with the conventional operations. An evaluation was made of three different types of display cases; air-curtain, reach-in (door-type), and multishelf cases. The evaluation was based on four factors: (1) Effect on sales, (2) labor requirements for stocking, (3) effect on customer flow, and (4) operating cost. Studies were made in three stores for one week to determine the effect the type of display case had on customer flow.
Integrating curvature: from Umlaufsatz to J^+ invariant
Creators: name: Lanzat, Sergei
name: Polyak, Michael
Publisher: name: arXiv
Year: 2011
Subjects: subject: Geometric Topology (math.GT)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53A04, 57R42

description: Hopf's Umlaufsatz relates the total curvature of a closed immersed plane curve to its rotation number. While the curvature of a curve changes under local deformations, its integral over a closed curve is invariant under regular homotopies. A natural question is whether one can find some non-trivial densities on a curve, such that the corresponding integrals are (possibly after some corrections) also invariant under regular homotopies of the curve in the class of generic immersions. We construct a family of such densities using indices of points relative to the curve. This family depends on a formal parameter q and may be considered as a quantization of the total curvature. The linear term in the Taylor expansion at q=1 coincides, up to a normalization, with Arnold's J^+ invariant. This leads to an integral expression for J^+.
description: 6 pages, 5 figures
Turning Privacy-preserving Mechanisms against Federated Learning
Creators: name: Arazzi, Marco
name: Conti, Mauro
name: Nocera, Antonino
name: Picek, Stjepan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Recently, researchers have successfully employed Graph Neural Networks (GNNs) to build enhanced recommender systems due to their capability to learn patterns from the interaction between involved entities. In addition, previous studies have investigated federated learning as the main solution to enable a native privacy-preserving mechanism for the construction of global GNN models without collecting sensitive data into a single computation unit. Still, privacy issues may arise as the analysis of local model updates produced by the federated clients can return information related to sensitive local data. For this reason, experts proposed solutions that combine federated learning with Differential Privacy strategies and community-driven approaches, which involve combining data from neighbor clients to make the individual local updates less dependent on local sensitive data. In this paper, we identify a crucial security flaw in such a configuration, and we design an attack capable of deceiving state-of-the-art defenses for federated learning. The proposed attack includes two operating modes, the first one focusing on convergence inhibition (Adversarial Mode), and the second one aiming at building a deceptive rating injection on the global federated model (Backdoor Mode). The experimental results show the effectiveness of our attack in both its modes, returning on average 60% performance detriment in all the tests on Adversarial Mode and fully effective backdoors in 93% of cases for the tests performed on Backdoor Mode.
Marsellus: A Heterogeneous RISC-V AI-IoT End-Node SoC with 2-to-8b DNN Acceleration and 30%-Boost Adaptive Body Biasing
Creators: name: Conti, Francesco
name: Paulin, Gianna
name: Garofalo, Angelo
name: Rossi, Davide
name: Di Mauro, Alfio
name: Rutishauser, Georg
name: Ottavi, Gianmarco
name: Eggimann, Manuel
name: Okuhara, Hayate
name: Benini, Luca
Publisher: name: arXiv
Year: 2023
Subjects: subject: Hardware Architecture (cs.AR)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Emerging Artificial Intelligence-enabled Internet-of-Things (AI-IoT) System-on-a-Chip (SoC) for augmented reality, personalized healthcare, and nano-robotics need to run many diverse tasks within a power envelope of a few tens of mW over a wide range of operating conditions: compute-intensive but strongly quantized Deep Neural Network (DNN) inference, as well as signal processing and control requiring high-precision floating-point. We present Marsellus, an all-digital heterogeneous SoC for AI-IoT end-nodes fabricated in GlobalFoundries 22nm FDX that combines 1) a general-purpose cluster of 16 RISC-V Digital Signal Processing (DSP) cores attuned for the execution of a diverse range of workloads exploiting 4-bit and 2-bit arithmetic extensions (XpulpNN), combined with fused MAC&LOAD operations and floating-point support; 2) a 2-8bit Reconfigurable Binary Engine (RBE) to accelerate 3x3 and 1x1 (pointwise) convolutions in DNNs; 3) a set of On-Chip Monitoring (OCM) blocks connected to an Adaptive Body Biasing (ABB) generator and a hardware control loop, enabling on-the-fly adaptation of transistor threshold voltages. Marsellus achieves up to 180 Gop/s or 3.32 Top/s/W on 2-bit precision arithmetic in software, and up to 637 Gop/s or 12.4 Top/s/W on hardware-accelerated DNN layers.
description: Post-print accepted by IEEE Journal of Solid-State Circuits. Fixed metadata (was missing one co-author), added DOI of IEEE JSSC
Modeling the Solar Cycle: What the Future Holds
Creators: name: Nandy, Dibyendu
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Stellar magnetic fields are produced by a magnetohydrodynamic dynamo mechanism working in their interior -- which relies on the interaction between plasma flows and magnetic fields. The Sun, being a well-observed star, offers an unique opportunity to test theoretical ideas and models of stellar magnetic field generation. Solar magnetic fields produce sunspots, whose number increases and decreases with a 11 year periodicity -- giving rise to what is known as the solar cycle. Dynamo models of the solar cycle seek to understand its origin, variation and evolution with time. In this review, I summarize observations of the solar cycle and describe theoretical ideas and dynamo modeling efforts to address its origin. I end with a discussion on the future of solar cycle modeling -- emphasizing the importance of a close synergy between observational data assimilation, kinematic dynamo models and full magnetohydrodynamic models of the solar interior.
description: 10 Pages, 3 Figures, Invited Review, Proceedings of IAU Symposium 286 on "Comparative Magnetic Minima: Characterizing quiet times in the Sun and stars", to be published by Cambridge University Press
Diochus setatus Huang, Janak & Zhou 2024
Creators: name: Huang, Tian
name: Janák, Jiří
name: Zhou, Hong-Zhang
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Diochus
Diochus setatus

description: 14. Diochus setatus Huang, Janák & Zhou, 2024
(Fig 1D)
Diochus setatus Huang, Janák, and Zhou, 2024: 516 (Type locality: Myanmar: Kalaw; India)
Type material examined. Holotype: male, MYANMAR: BURMA, Kalaw, 19: III: 1982, de Rougemont (GROG). Paratype: INDIA: Assam: 1 male, Manas, 200 m, 23. X. 78, Besuchet-Löbl (MHNG).
Diagnosis. According to the elongate antennae and numerous short and dense setae on posterior margin of the male sternite VIII, this species can be easily distinguished from most other species. Diochus conicollis also has elongate antennae and numerous setae on male sternite VIII, which are similar to this species, but the male sternite VIII in D. conicollis is more shallowly emarginate and with less dense setae and the aedeagus of D. conicollis has shorter parameres and different inner structure.
Distribution. Myanmar, India.
description: Published as part of Huang, Tian, Janák, Jiří & Zhou, Hong-Zhang, 2025, Revision of the genus Diochus Erichson (Coleoptera: Staphylinidae, Staphylininae, Diochini) from Thailand and Myanmar, pp. 105-142 in Zootaxa 5620 (1) on page 140, DOI: 10.11646/zootaxa.5620.1.5, http://zenodo.org/record/15219019
Comment on: "Vortex-assisted photon count and their magnetic field dependence in single-photon superconducting detectors" by L.N. Bulaevskii, M.J. Graf and V.G. Kogan, Phys. Rev. B 85, 014505 (2012)
Creators: name: Gurevich, A.
name: Vinokur, V. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In this Comment we show that the statements made in PRB85, 014505 (2012) regarding our work (PRL 100, 227007 (2008))) are incorrect because they result from model artifacts. We address the issues neglected in PRB85, 014505 (2012) and discuss their importance for a more consistent theory of thermally-activated hoping of vortices in thin films and the interpretation of experimental data.
Caged black hole with Maxwell charge
Creators: name: Suzuki, Ryotaku
name: Kinoshita, Shunichiro
name: Shiromizu, Tetsuya
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We construct the perturbative solution of the charged black hole in the Kaluza-Klein spacetime with the matched asymptotic expansion method. The corrections to the thermodynamic variables are calculated up to the post-Newtonian order. We confirmed that the method can work very well in the Einstein-Maxwell theory.
description: 17 pages
Lift and drag forces on an inclined plow moving over a granular surface
Creators: name: Percier, Baptiste
name: Manneville, Sebastien
name: McElwaine, Jim N.
name: Morris, Stephen
name: Taberlet, Nicolas
Publisher: name: arXiv
Year: 2011
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We studied the drag and lift forces acting on an inclined plate while it is dragged on the surface of a granular media, both in experiment and numerical simulation. In particular, we investigated the influence of the horizontal velocity of the plate and its angle of attack. We show that a steady wedge of grains is moved in front of the plow and that the lift and drag forces are proportional to the weight of this wedge. These constants of proportionality vary with the angle of attack but not (or only weakly) on the velocity. We found a universal effective friction law which accounts for the dependence on all the above-mentioned parameters. The stress and velocity fields are calculated from the numerical simulations and show the existence of a shear band under the wedge and that the pressure is non-hydrostatic. The strongest gradients in stress and shear occur at the base of the plow where the dissipation rate is therefore highest.
description: 8 pages, 10 figures, submitted to Phys. Rev. E