cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Extremely rapid x-ray flares of tev blazars in the rxte era
Creators: name: Zhu, S. F.
name: Xue, Y. Q.
name: Brandt, W. N.
name: Cui, W.
name: Wang, Y. J.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Rapid flares from blazars in very high energy (VHE) $γ$-rays challenge the common understanding of jets of active galactic nuclei (AGNs). The same population of ultra-relativistic electrons is often thought to be responsible for both X-ray and VHE emission. We thus systematically searched for X-ray flares at sub-hour timescales of TeV blazars in the entire Rossi X-ray Timing Explorer archival database. We found rapid flares from PKS 2005-489 and S5 0716+714, and a candidate rapid flare from 1ES 1101-232. In particular, the characteristic rise timescale of PKS 2005-489 is less than half a minute, which, to our knowledge, is the shortest among known AGN flares at any wavelengths. The timescales of these rapid flares indicate that the size of the central supermassive black hole is not a hard lower limit on the physical size of the emission region of the flare. PKS 2005-489 shows possible hard lags in its flare, which could be attributed to particle acceleration (injection), its flaring component has the hardest spectrum when it first appears. For all flares, the flaring components show similar hard spectra with $Γ=1.7-1.9$, and we estimate the magnetic field strength $B\sim$ 0.1--1.0 G by assuming synchrotron cooling. These flares could be caused by inhomogeneity of the jets. Models that can only produce rapid $γ$-ray flares but little synchrotron activity are less favorable.
description: 12 pages, 10 figures, accepted in ApJ
Untitled Item
Creators: name: SADATY, BTESAAM
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 330315
subject: Textile and fashion design

description: / SOS / TAKE THIS EXAMPLE FOR LIFE
 PEOPLE / SKIN CARE 89B FLORA / BHS SADATY BTESAAM SOLDATEN VAN ORANJE / NEGERS VERKRACHTING AMSTERDAM / POLITIE FRAUDEN / ROBBERY 17 MEN STEALING AL THE WORK AND TAX / KLRF CHIRURIG / HERIT THE FIRM / KNIPMAR 7 MURDERS , AT 11.000000 / INSURANCE / DHLRFK
NO SEX / KALIM PETROVA _ DHLRF COMPANY HOTELS. WORKD / DRUGS , TEST , NEDERLAND / OPIATEN , HEROINES NSRKF / WHLRF / FRAUDEN , CRIMINAL DRUGS AMSTERDAM / SEX PERVERT CHIRUGIE / WHLRF KLLRF BERLIN , POSTBANK ID THEFT ROBBERY POLICE FEMMES NAZI BLRF, / RTL MEDIA NSLRF OSTBLANC WOOD E CALLS.....
Low Scale Technicolour at LEP
Creators: name: King, Stephen F.
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the phenomenology of an $SU(2)_{TC}$ technicolour model with a low technicolour confinement scale $Λ_{TC} \sim 50-100 GeV$. Such a low technicolour scale may give rise to the first hints of technicolour being seen at LEPI and spectacular technicolour signals at LEPII.
description: 12 pages+1 figure (available by post), Latex, SHEP92/93-22
Holographic local quench and effective complexity
Creators: name: Ageev, Dmitry S.
name: Aref'eva, Irina Ya.
name: Bagrov, Andrey A.
name: Katsnelson, Mikhail I.
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the evolution of holographic complexity of pure and mixed states in $1+1$-dimensional conformal field theory following a local quench using both the "complexity equals volume" (CV) and the "complexity equals action" (CA) conjectures. We compare the complexity evolution to the evolution of entanglement entropy and entanglement density, discuss the Lloyd computational bound and demonstrate its saturation in certain regimes. We argue that the conjectured holographic complexities exhibit some non-trivial features indicating that they capture important properties of what is expected to be effective (or physical) complexity.
description: 33 pages, 19 figures; v2: typos corrected; 35 pages, references added, new appendix. Version to match published in JHEP
Nonlinear phenomena in general relativity
Creators: name: Allahyari, Alireza
name: Firouzjaee, Javad T.
name: Mansouri, Reza
Publisher: name: arXiv
Year: 2018
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The perturbation theory plays an important role in studying structure formation in cosmology and post-Newtonian physics, but not all phenomena can be described by the linear perturbation theory. Thus, It is necessary to study exact solutions or higher order perturbations. Specifically, we study black hole (apparent) horizons and the cosmological event horizon formation in the perturbation theory. We emphasize that in the perturbative regime of the gravitational potential these horizons cannot form in the lower order. Studying the infinite plane metric, we show that to capture the cosmological constant effect we need at least a second order expansion.
description: 8 pages, 2 figures
The Grounds For Time Dependent Market Potentials From Dealers' Dynamics
Creators: name: Yamada, Kenta
name: Takayasu, Hideki
name: Takayasu, Misako
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Finance (q-fin.GN)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Economics and business
subject: FOS: Physical sciences

description: We apply the potential force estimation method to artificial time series of market price produced by a deterministic dealer model. We find that dealers' feedback of linear prediction of market price based on the latest mean price changes plays the central role in the market's potential force. When markets are dominated by dealers with positive feedback the resulting potential force is repulsive, while the effect of negative feedback enhances the attractive potential force.
description: 9 pages, 3 figures, proceedings of APFA6
A Comparison of Machine Learning Algorithms for the Surveillance of Autism Spectrum Disorder
Creators: name: Lee, Scott H
name: Maenner, Matthew J
name: Heilig, Charles M
Publisher: name: arXiv
Year: 2018
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The Centers for Disease Control and Prevention (CDC) coordinates a labor-intensive process to measure the prevalence of autism spectrum disorder (ASD) among children in the United States. Random forests methods have shown promise in speeding up this process, but they lag behind human classification accuracy by about 5%. We explore whether more recently available document classification algorithms can close this gap. We applied 8 supervised learning algorithms to predict whether children meet the case definition for ASD based solely on the words in their evaluations. We compared the algorithms' performance across 10 random train-test splits of the data, using classification accuracy, F1 score, and number of positive calls to evaluate their potential use for surveillance. Across the 10 train-test cycles, the random forest and support vector machine with Naive Bayes features (NB-SVM) each achieved slightly more than 87% mean accuracy. The NB-SVM produced significantly more false negatives than false positives (P = 0.027), but the random forest did not, making its prevalence estimates very close to the true prevalence in the data. The best-performing neural network performed similarly to the random forest on both measures. The random forest performed as well as more recently available models like the NB-SVM and the neural network, and it also produced good prevalence estimates. NB-SVM may not be a good candidate for use in a fully-automated surveillance workflow due to increased false negatives. More sophisticated algorithms, like hierarchical convolutional neural networks, may not be feasible to train due to characteristics of the data. Current algorithms might perform better if the data are abstracted and processed differently and if they take into account information about the children in addition to their evaluations.
Search for anions in molecular sources: C4H- detection in L1527
Creators: name: Agundez, M.
name: Cernicharo, J.
name: Guelin, M.
name: Gerin, M.
name: McCarthy, M. C.
name: Thaddeus, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of a search for the negative ion C4H- in various dark clouds, low mass star-forming regions and photon-dominated regions (PDRs). We have also searched for C6H-, C2H- and CN- in some of the sources. The millimeter-wave observations were carried out with the IRAM-30m telescope. We detect C4H-, through the J = 9-8 and J = 10-9 rotational transitions, in the low mass star-forming region L1527. We thus confirm the tentative detection of the J = 9-8 line recently reported toward this source. The [C4H-]/[C4H] ratio found is 0.011 %, which is slightly lower than the value observed in IRC +10216, 0.024 %, but above the 3 sigma upper limit we derive in TMC-1, < 0.0052 %. We have also derived an upper limit for the [C6H-]/[C6H] ratio in the Horsehead Nebula, and for various anion-to-neutral ratios in the observed sources. These results are compared with recent chemical models.
description: 4 pages, 1 figure; accepted for A&A Letters
WORK ON SYSTEMATIC GRAMMATICAL TASKS AIMED AT CREATING TEXT
Creators: name: Sanoyeva, M.N.
Publisher: name: Zenodo
Year: 2024

description: the article talks about the necessary methodological principles of teaching students to create text. The issues of comparing, differentiating, selecting, grouping, analyzing and synthesizing linguistic phenomena and preparing the younger generation for Text creation on the basis of interdisciplinary communication are widely covered.
Standardised Template for Biosample Metadata Collection
Creators: name: Ghosh, Soumyabrata
Publisher: name: Zenodo
Year: 2021
Subjects: biosample
metadata
psoriasis
atopic dermatitis

description: Objective: Develop a common standard in the BIOMAP Consortium for biobanks’ biosample summary data, collectively known as biosample-metadata, create catalog solution for biosample-metadata and develop a generic workflow for biosample request. To generate a common data model for storing biosample metadata and biobanking details in BIOMAP project, UL and a collaborating group of biosample providers have developed a Virtual Biobank Template. This template needs to discussed in the consortium and based on the feedback a finalised version of Virtual Biobank Template will be released.
Soliton solutions in geometrically nonlinear Cosserat micropolar elasticity with large deformations
Creators: name: Boehmer, Christian G.
name: Lee, Yongjo
name: Neff, Patrizio
Publisher: name: arXiv
Year: 2018
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study the fully nonlinear dynamical Cosserat micropolar elasticity problem in space with three dimensionals with various energy functionals dependent on the microrotation $\overline{R}$ and the deformation gradient tensor $F$ . We derive a set of coupled nonlinear equations of motion from first principles by varying the complete energy functional. We obtain a double sine-Gordon equation and construct soliton solutions. We show how the solutions can determine the overall deformational behaviour and discuss the relations between wave numbers and wave velocities thereby identifying parameter values where the waves cannot propagate.
description: 17 pages, 6 figures
The Levered Equity Risk Premium and Credit Spreads: A Unified Framework
Creators: name: Harjoat S. Bhamra
name: Lars-Alexander Kuehn
name: Strebulaev, Ilya A.
Publisher: name: Carnegie Mellon University
Year: 1987
Subjects: subject: 150399 Business and Management not elsewhere classified
subject: FOS: Economics and business

description: We embed a structural model of credit risk inside a dynamic continuous-time consumption-based asset pricing model, which allows us to price equity and corporate debt in a unified framework. Our key economic assumptions are that the first and second moments of earnings and consumption growth depend on the state of the economy which switches randomly, creating intertemporal risk, which agents prefer to resolve sooner rather than later, because they have Epstein-Zin-Weil preferences. Agents optimally choose dynamic capital structure and default times. For a dynamic cross-section of firms, our model endogenously generates a realistic average term structure and time series of actual default probabilities and credit spreads, together with a reasonable levered equity risk premium, which varies with macroeconomic conditions.
London relation and fluxoid quantization for monopole currents in U(1) lattice gauge theory
Creators: name: Singh, Vandana
name: Haymaker, Richard W.
name: Browne, Dana A.
Publisher: name: arXiv
Year: 1992
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We explore the analogy between quark confinement and the Meissner effect in superconductors. We measure the response of color-magnetic "supercurrents" from Dirac magnetic monopoles to the presence of a static quark-antiquark pair in four dimensional U(1) lattice gauge theory. Our results indicate that in the confined phase these currents screen the color-electric flux due to the quarks in an electric analogy of the Meisner effect. We show that U(1) lattice guage theory obeys both a dual London equation and an electric fluxoid quantization condition.
description: LSUHEP-1-92 May 1992, 13 pages
Geometric Surface-Based Tracking Control of a Quadrotor UAV
Creators: name: Ramp, Michalis
name: Papadopoulos, Evangelos
Publisher: name: arXiv
Year: 2018
Subjects: subject: Systems and Control (eess.SY)
subject: Dynamical Systems (math.DS)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: New quadrotor UAV control algorithms are developed, based on nonlinear surfaces composed of tracking errors that evolve directly on the nonlinear configuration manifold, thus inherently including in the control design the nonlinear characteristics of the SE(3) configuration space. In particular, geometric surface-based controllers are developed and are shown, through rigorous stability proofs, to have desirable almost global closed loop properties. For the first time in regards to the geometric literature, a region of attraction independent of the position error is identified and its effects are analyzed. The effectiveness of the proposed "surface based" controllers are illustrated by simulations of aggressive maneuvers in the presence of disturbances and motor saturation.
description: 2018 26th Mediterranean Conference on Control and Automation (MED)
The International Debt Problem, Insolvency, and Illiquidity: A Policy Proposal
Creators: name: Brunner, Karl
name: Fratianni, Michele
name: Goldman, Morris
name: Jordan, Jerry L.
name: Meltzer, Allan
name: Schwartz, Anna J.
Publisher: name: Carnegie Mellon University
Year: 2000
Subjects: subject: 150399 Business and Management not elsewhere classified
subject: FOS: Economics and business

description: The total volume of international debt of developing nations rose from about $340 billion in 1978 to about $640 billion in 1982. This increase of almost 90 percent over four years, even after adjustment for world inflation, has outpaced the debtor nations1 real growth. Interest payments measured in current dollars exploded from about $20 billion to approximately $66 billion over the same period. A marked increase in the average rate of interest payable on outstanding loans, reflected in a more than 300 percent rise of interest payments compared to the 90 percent increase in debt, aggravated the debtor nations1 real debt burden. Over the same four years the proportion of international reserves to imports of developing nations fell from 27 percent to 17 percent.
Chiral Perturbation to One Loop Including the $ρ$ Meson
Creators: name: Tanabashi, Masaharu
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We formulate the chiral perturbation theory at the one loop level in the effective lagrangian including the $ρ$ meson as a dynamical gauge boson of a hidden local symmetry(HLS). The size of radiative correction to the phenomenological parameter $a$ of HLS is estimated to be about $10$\%. The complete list of ${\cal O}(E^4)$ terms is given and the one loop counter terms are determined explicitly in the $N$ flavor model. We also obtain matching conditions to the conventional chiral perturbation of Gasser and Leutwyler in the chiral limit in a renormalization scale independent manner. We find that Gasser--Leutwyler's estimates for $L_{9,10}$ are saturated by $ρ$ and its one loop contributions without introducing non-minimal couplings of $π$-$ρ$ system, suggesting the absence of the tree level $a_1$ meson contributions.
description: 14pages, KEK-TH-349/KEK preprint 92-169
Electrochemical membrane microactuator with a millisecond response time
Creators: name: Uvarov, Ilia V.
name: Lokhanin, Mikhail V.
name: Postnikov, Alexander V.
name: Melenev, Artem E.
name: Svetovoy, Vitaly B.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Applied Physics (physics.app-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Lack of fast and strong actuators to drive microsystems is well recognized. Electrochemical actuators are considered attractive for many applications but they have long response time (minutes) due to slow gas termination. Here an electrochemical actuator is presented for which the response time can be as short as 1 ms. The alternating polarity water electrolysis is used to drive the device. In this process only nanobubbles are formed. The gas in nanobubbles can be terminated fast due to surface assisted reaction between hydrogen and oxygen that happens at room temperature. The working chamber of the actuator contains concentric titanium electrodes; it has a diameter of 500 um and a height of 8 um. The chamber is sealed by a polydimethylsiloxane (PDMS) membrane of 30 um thick. The device is characterized by an interferometer and a fast camera. Cyclic operation at frequency up to 667 Hz with a stroke of about 30% of the chamber volume is demonstrated. The cycles repeat themselves with high precision providing the volume strokes in picoliter range. Controlled explosions in the chamber can push the membrane up to 90 um.
description: author's version, 8 pages, 9 figures (to appear in Sensors and Actuators B: Chemical)
VLocNet++: Deep Multitask Learning for Semantic Visual Localization and Odometry
Creators: name: Radwan, Noha
name: Valada, Abhinav
name: Burgard, Wolfram
Publisher: name: arXiv
Year: 2018
Subjects: subject: Robotics (cs.RO)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Semantic understanding and localization are fundamental enablers of robot autonomy that have for the most part been tackled as disjoint problems. While deep learning has enabled recent breakthroughs across a wide spectrum of scene understanding tasks, its applicability to state estimation tasks has been limited due to the direct formulation that renders it incapable of encoding scene-specific constrains. In this work, we propose the VLocNet++ architecture that employs a multitask learning approach to exploit the inter-task relationship between learning semantics, regressing 6-DoF global pose and odometry, for the mutual benefit of each of these tasks. Our network overcomes the aforementioned limitation by simultaneously embedding geometric and semantic knowledge of the world into the pose regression network. We propose a novel adaptive weighted fusion layer to aggregate motion-specific temporal information and to fuse semantic features into the localization stream based on region activations. Furthermore, we propose a self-supervised warping technique that uses the relative motion to warp intermediate network representations in the segmentation stream for learning consistent semantics. Finally, we introduce a first-of-a-kind urban outdoor localization dataset with pixel-level semantic labels and multiple loops for training deep networks. Extensive experiments on the challenging Microsoft 7-Scenes benchmark and our DeepLoc dataset demonstrate that our approach exceeds the state-of-the-art outperforming local feature-based methods while simultaneously performing multiple tasks and exhibiting substantial robustness in challenging scenarios.
description: Demo and dataset available at http://deeploc.cs.uni-freiburg.de
Building Blue Stragglers with Stellar Collisions
Creators: name: Glebbeek, E.
name: Pols, O. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The evolution of stellar collision products in cluster simulations has usually been modelled using simplified prescriptions. Such prescriptions either replace the collision product with an (evolved) main sequence star, or assume that the collision product was completely mixed during the collision. It is known from hydrodynamical simulations of stellar collisions that collision products are not completely mixed, however. We have calculated the evolution of stellar collision products and find that they are brighter than normal main sequence stars of the same mass, but not as blue as models that assume that the collision product was fully mixed during the collision.
description: 2 pages, 1 figure. To appear in the proceedings of Dynamical Evolution of Dense Stellar Systems, IAU Symposium 246
Co-evolution of supermassive black holes with galaxies from semi-analytic model: stochastic gravitational wave background and black hole clustering
Creators: name: Yang, Qing
name: Hu, Bin
name: Li, Xiao-Dong
Publisher: name: arXiv
Year: 2018
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We study the co-evolution of supermassive black holes (SMBHs) with galaxies by means of semi-analytic model (SAM) of galaxy formation based on sub-halo merger trees built from Millennium and Millennium-II simulation. We utilize the simulation results from Guo 2013 and Henriques 2015 to study two aspects of the co-evolution, \emph{i.e.} the stochastic gravitational wave (GW) background generated by SMBH merger and the SMBH/galaxy clustering. The characteristic strain amplitude of GW background predicted by Guo 2013 and Henriques 2015 models are $A_{yr^{-1}}=5.00\times10^{-16}$ and $A_{yr^{-1}}=9.42\times10^{-17}$, respectively. We find the GW amplitude is very sensitive to the galaxy merger rate. The difference in the galaxy merger rate between Guo 2013 and Henriques 2015, results in a factor $5$ deviation in the GW strain amplitude. For clusterings, we calculate the spatially isotropic two point auto- and cross-correlation functions (2PCFs) for both SMBHs and galaxies by using the mock catalogs generated from Guo 2013 model. We find that all 2PCFs have positive dependence on both SMBH and galaxy mass. And there exist a significant time evolution in 2PCFs, namely, the clustering effect is enhanced at lower redshifts. Interestingly, this result is not reported in the active galactic nuclei samples in SDSS. Our analysis also shows that, roughly, SMBHs and galaxies, with galaxy mass $10^2\sim10^3$ larger than SMBH mass, have similar pattern of clustering, which is a reflection of the co-evolution of SMBH and galaxy. Finally, we calculate the first ten multiples of the angular power spectrum of the energy density of GW background. We find the amplitude of angular power spectrum of the first ten multiples is about $10\%$ to $60\%$ of the monopole component in the whole frequency range.
description: 13 pages, 9 figures
The International Debt Problem
Creators: name: Meltzer, Allan
Publisher: name: Carnegie Mellon University
Year: 2010
Subjects: subject: 150399 Business and Management not elsewhere classified
subject: FOS: Economics and business

description: Several points should be made when considering the current international debt problem. First, I discuss the role of oil shocks, the most common explanation of the problem, and argue that the oil shocks do not explain why some countries are unable to make the interest and principal payments on their international debt. Second, I look at a more credible explanation of the problem, the policies chosen by particular debtor countries, and discuss some consequences of those policies. Next, I consider the proper method of evaluating a debtor's financial position. Finally, I briefly discuss some alternative solutions
Measurement of the Absolute Branching Fraction of D_s^+ --> tau^+ nu_tau Decay
Creators: name: CLEO Collaboration
name: Ecklund, K. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Using a sample of tagged D_s decays collected near the D^*_s D_s peak production energy in e+e- collisions with the CLEO-c detector, we study the leptonic decay D^+_s to tau^+ nu_tau via the decay channel tau^+ to e^+ nu_e bar{nu}_tau. We measure B(D^+_s to tau^+ nu_tau) = (6.17 +- 0.71 +- 0.34) %, where the first error is statistical and the second systematic. Combining this result with our measurements of D^+_s to mu^+ nu_mu and D^+_s to tau^+ nu_tau (via tau^+ to pi^+ bar{nu}_tau), we determine f_{D_s} = (274 +- 10 +- 5) MeV.
description: 9 pages, postscript also available through http://www.lns.cornell.edu/public/CLNS/2007/, revised
Low temperature expansion for the 3-d Ising Model
Creators: name: Bhanot, Gyan
name: Creutz, Michael
name: Lacki, Jan
Publisher: name: arXiv
Year: 1992
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We compute the weak coupling expansion for the energy of the three dimensional Ising model through 48 excited bonds. We also compute the magnetization through 40 excited bonds. This was achieved via a recursive enumeration of states of fixed energy on a set of finite lattices. We use a linear combination of lattices with a generalization of helical boundary conditions to eliminate finite volume effects.
description: 10 pages, IASSNS-HEP-92/42, BNL-47671
Universal image systems for non-periodic and periodic Stokes flows above a no-slip wall
Creators: name: Yan, Wen
name: Shelley, Michael
Publisher: name: arXiv
Year: 2018
Subjects: subject: Numerical Analysis (math.NA)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: It is well-known that by placing judiciously chosen image point forces and doublets to the Stokeslet above a flat wall, the no-slip boundary condition can be conveniently imposed on the wall [Blake, J. R. Math. Proc. Camb. Philos. Soc. 70(2), 1971: 303.]. However, to further impose periodic boundary conditions on directions parallel to the wall usually involves tedious derivations because single or double periodicity in Stokes flow may require the periodic unit to have no net force, which is not satisfied by the well-known image system. In this work we present a force-neutral image system. This neutrality allows us to represent the Stokes image system in a universal formulation for non-periodic, singly periodic and doubly periodic geometries. This formulation enables the black-box style usage of fast kernel summation methods. We demonstrate the efficiency and accuracy of this new image method with the periodic kernel independent fast multipole method in both non-periodic and doubly periodic geometries. We then extend this new image system to other widely used Stokes fundamental solutions, including the Laplacian of the Stokeslet and the Rotne-Prager-Yamakawa tensor.
description: To appear in Journal of Computational Physics
Experimental Evaluation of the Effects of Antenna Radiation Characteristics on Heart Rate Monitoring Radar Systems
Creators: name: Nosrati, Mehrdad
name: Tavassolian, Negar
Publisher: name: arXiv
Year: 2018
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper presents an experimental study to evaluate the effects of antenna radiation parameters on the detection capabilities of a 2.4 GHz Doppler radar used in non-contact heart rate monitoring systems. Four different types of patch antennas and array configurations were implemented on both the transmitter and receiver sides. Extensive experiments using a linear actuator were performed and several interesting and nontrivial results were reported. It is shown that using a linearly polarized single patch antenna at the transmitter and a circularly polarized antenna array at the receiver results in the highest signal quality and system performance. Proof-of-concept experiments on human subjects further validated the suggested results. It was also shown that using the recommended antenna arrangement will boost the heart rate detection accuracy of the radar by an average of 11%.
description: 13 pages. This is an extended version of our previously published paper (doi: 10.1109/TAP.2017.2694861)
BRIDGING COMMUNITIES, BOOSTING NUTRITION: ADDRESSING PUBLIC HEALTH THROUGH INFRASTRUCTURE IMPROVEMENTS IN FAYETTEVILLE, NC
Creators: name: Nelson, Bryan
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2025
Subjects: Biking
Public Health
Public Health Nutrition
Sidewalk
Nutrition
Pedestrian
Public Health Infrastructure

description:
Fayetteville, North Carolina, faces a public health crisis rooted in poor walkability and limited food access, contributing to high rates of obesity, diabetes, and food insecurity—especially among low-income and minority residents. With a Walk Score of 21/100, the city ranks among the least walkable in the U.S. This capstone proposes a place-based nutrition intervention integrating two evidence-based models: the Complete Streets Initiative and Safe Routes to Healthy Food (SRHF). The intervention includes (1) constructing pedestrian and bike infrastructure within a one-mile radius of grocery stores and (2) establishing SRHF corridors to connect food-insecure neighborhoods with retailers. Grounded in the socioecological model, the plan aims to increase physical activity and improve dietary behaviors. Evaluation methods include traffic counts, consumer surveys, dietary recalls, and geospatial analysis. This initiative seeks a 20% increase in foot traffic and a 25% improvement in produce consumption, offering a cost-effective, equity-driven strategy to reduce chronic disease in underserved communities.
CD-CNN: A Partially Supervised Cross-Domain Deep Learning Model for Urban Resident Recognition
Creators: name: Wang, Jingyuan
name: He, Xu
name: Wang, Ze
name: Wu, Junjie
name: Yuan, Nicholas Jing
name: Xie, Xing
name: Xiong, Zhang
Publisher: name: arXiv
Year: 2018
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Driven by the wave of urbanization in recent decades, the research topic about migrant behavior analysis draws great attention from both academia and the government. Nevertheless, subject to the cost of data collection and the lack of modeling methods, most of existing studies use only questionnaire surveys with sparse samples and non-individual level statistical data to achieve coarse-grained studies of migrant behaviors. In this paper, a partially supervised cross-domain deep learning model named CD-CNN is proposed for migrant/native recognition using mobile phone signaling data as behavioral features and questionnaire survey data as incomplete labels. Specifically, CD-CNN features in decomposing the mobile data into location domain and communication domain, and adopts a joint learning framework that combines two convolutional neural networks with a feature balancing scheme. Moreover, CD-CNN employs a three-step algorithm for training, in which the co-training step is of great value to partially supervised cross-domain learning. Comparative experiments on the city Wuxi demonstrate the high predictive power of CD-CNN. Two interesting applications further highlight the ability of CD-CNN for in-depth migrant behavioral analysis.
description: 8 pages, 5 figures, conference
Real Time Analysis of Thermal Activation via Sphaleron Transitions
Creators: name: Boyanovsky, D.
name: de Carvalho, C. A.
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the process of thermal activation mediated by sphaleron transitions by analyzing the real-time dynamics of the decay out of equilibrium in a $1+1$ dimensional field theory with a metastable state. The situation considered is that of a rapid supercooling in which the system is trapped in a metastable state at a temperature larger than the mass of the quanta, but smaller than the energy to create a critical droplet. The initial density matrix is evolved in time and the nucleation rate (probability current at the saddle point) is computed. The nucleation rate is {\it time dependent}, vanishing at early times, reaching a maximum at a time $t \approx 1/m$ with $m$ the mass of quanta in the metastable state, and decreasing at long times as a consequence of unitarity. An estimate for the average number of particles of ``true vacuum'' produced as a function of time during the nucleation process is obtained.
description: 26 pages 6 figures (available upon request), PITT-93-06, LATEX
The Intergenerational Conflict Over the Provisions of Public Education
Creators: name: Epple, Dennis
name: Romano, Richard
name: Sieg, Holger
Publisher: name: Carnegie Mellon University
Year: 2009
Subjects: subject: 150399 Business and Management not elsewhere classified
subject: FOS: Economics and business

description: We study the inter-generational conflict over the provision of public education. This conflict arises because older households without children have weaker incentives to support the provision of high quality educational services in a community than younger households with school-age children. We develop an overlapping generations model for households in a system of multiple jurisdictions. This model captures the differences in preferred policies over the life-cycle. We show that the observed inequality in educational policies across communities is not only the outcome of stratification by income, but is also determined by the stratification by age and a political process that is dominated by older voters in many urban communities with low quality of educational services. The mobility of older households creates a positive fiscal externality since it creates a larger tax base per student. This positive tax externality can dominate the negative effects that arise because older households tend to vote for lower educational expenditures. As a consequence sorting by age can reduce the inequality in educational outcomes that is driven by income sorting.
The Implementation Challenge of Pricing Decision Support Systems for Retail Managers
Creators: name: Montgomery, Alan
Publisher: name: Carnegie Mellon University
Year: 1986
Subjects: subject: 150399 Business and Management not elsewhere classified
subject: FOS: Economics and business

description: There has been an explosion in the availability of data and computing ability in retail management that has led to a new desire on the part of managers to implement demand based management. Demand based management uses statistical models to predict consumer price response using historical information. These models can be used to construct pricing decision support systems for retail managers. Currently, many firms have begun offering software to perform price optimization. This article considers how recent advances in academic research can contribute to the implementation of these systems, and in turn consider the new questions likely to be posed by the developers and users of these new systems
Noise-induced backscattering in a quantum-spin-Hall edge
Creators: name: Väyrynen, Jukka I.
name: Pikulin, Dmitry I.
name: Alicea, Jason
Publisher: name: arXiv
Year: 2018
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Time-reversal symmetry suppresses electron backscattering in a quantum-spin-Hall edge, yielding quantized conductance at zero temperature. Understanding the dominant corrections in finite-temperature experiments remains an unsettled issue. We study a novel mechanism for conductance suppression: backscattering caused by incoherent electromagnetic noise. Specifically, we show that an electric potential fluctuating randomly in time can backscatter electrons inelastically without constraints faced by electron-electron interactions. We quantify noise-induced corrections to the dc conductance in various regimes and propose an experiment to test this scenario.
description: 5+3 pages, 1 figure; shortened version to appear in PRL, added references
A near-infrared interferometric survey of debris disk stars. I. Probing the hot dust content around epsilon Eridani and tau Ceti with CHARA/FLUOR
Creators: name: Di Folco, E.
name: Absil, O.
name: Augereau, J. -C.
name: Mérand, A.
name: Foresto, V. Coudé du
name: Thévenin, F.
name: Defrère, D.
name: Kervella, P.
name: Brummelaar, T. A. ten
name: McAlister, H. A.
name: Ridgway, S. T.
name: Sturmann, J.
name: Sturmann, L.
name: Turner, N. H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We probed the first 3AU around tau Ceti and epsilon Eridani with the CHARA array (Mt Wilson, USA) in order to gauge the 2micron excess flux emanating from possible hot dust grains in the debris disks and to also resolve the stellar photospheres. High precision visibility amplitude measurements were performed with the FLUOR single mode fiber instrument and telescope pairs on baselines ranging from 22 to 241m of projected length. The short baseline observations allow us to disentangle the contribution of an extended structure from the photospheric emission, while the long baselines constrain the stellar diameter. We have detected a resolved emission around tau Cet, corresponding to a spatially integrated, fractional excess flux of 0.98 +/- 0.21 x 10^{-2} with respect to the photospheric flux in the K'-band. Around eps Eri, our measurements can exclude a fractional excess of greater than 0.6x10^{-2} (3sigma). We interpret the photometric excess around tau Cet as a possible signature of hot grains in the inner debris disk and demonstrate that a faint, physical or background, companion can be safely excluded. In addition, we measured both stellar angular diameters with an unprecedented accuracy: Theta_LD(tau Cet)= 2.015 +/- 0.011 mas and Theta_LD(eps Eri)=2.126 +/- 0.014 mas.
description: 8 pages, 5 figures, to appear in Astronomy and Astrophysics
Properties of Interfaces in the two and three dimensional Ising Model
Creators: name: Berg, B. A.
name: Hansmann, U.
name: Neuhaus, T.
Publisher: name: arXiv
Year: 1992
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: To investigate order-order interfaces, we perform multimagnetical Monte Carlo simulations of the $2D$ and $3D$ Ising model. Following Binder we extract the interfacial free energy from the infinite volume limit of the magnetic probability density. Stringent tests of the numerical methods are performed by reproducing with high precision exact $2D$ results. In the physically more interesting $3D$ case we estimate the amplitude $F^s_0$ of the critical interfacial tension $F^s = F^s_0 t^μ$ to be $F^s_0 = 1.52 \pm 0.05$. This result is in good agreement with a previous MC calculation by Mon, as well as with experimental results for related amplitude ratios. In addition, we study in some details the shape of the magnetic probability density for temperatures below the Curie point.
description: 25 pages; sorry no figures included
Eigenmoments for Multifragmentation
Creators: name: Giraud, B. G.
name: Peschanski, R.
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Linear rate equations are used to describe the cascading decay of an initial heavy cluster into fragments. Using a procedure inspired by the similar, but continuous case of jet fragmentation in QCD, this discretized process may be analyzed into eigenmodes, corresponding to moments of the distribution of multiplicities. The orders of these moments are usually noninteger numbers. The resulting analysis can be made time independent and is applicable to various phenomenological multifragmentation processes, in which case it leads to new approximate finite-size scaling relations for the spectrum of fragments.
description: 11 pages (TeX), figures not included (available on request), Saclay Preprint T93/056
Rigorous results for the distribution of money on connected graphs
Creators: name: Lanchier, Nicolas
name: Reed, Stephanie
Publisher: name: arXiv
Year: 2018
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60K35, 91B72

description: This paper is concerned with general spatially explicit versions of three stochastic models for the dynamics of money that have been introduced and studied numerically by statistical physicists: the uniform reshuffling model, the immediate exchange model and the model with saving propensity. All three models consist of systems of economical agents that consecutively engage in pairwise monetary transactions. Computer simulations performed in the physics literature suggest that, when the number of agents and the average amount of money per agent are large, the distribution of money at equilibrium approaches the exponential distribution for the first model, the gamma distribution with shape parameter two for the second model and a gamma distribution whose shape parameter depends on the saving propensity for the third model. The main objective of this paper is to give rigorous proofs of and extend these conjectures to generalizations of the first two models and a variant of the third model that include local rather than global interactions, i.e., instead of choosing the two interacting agents uniformly at random from the system, the agents are located on the vertex set of a general connected graph and can only interact with their neighbors.
description: 17 pages, 2 figures
Crystallographic bulk-edge correspondence: glide reflections and twisted mod 2 indices
Creators: name: Gomi, Kiyonori
name: Thiang, Guo Chuan
Publisher: name: arXiv
Year: 2018
Subjects: subject: Mathematical Physics (math-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: K-Theory and Homology (math.KT)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 19L50 (Primary) 19K56, 47L80 (Secondary)

description: A 2-torsion topological phase exists for Hamiltonians symmetric under the wallpaper group with glide reflection symmetry, corresponding to the unorientable cycle of the Klein bottle fundamental domain. We prove a mod 2 twisted Toeplitz index theorem, which implies a bulk-edge correspondence between this bulk phase and the exotic topological zero modes that it acquires along a boundary glide axis.
description: 50 pages, 9 figures. References added, figures improved, Appendix B on integer crystallographic bulk-edge correspondence added, typos corrected for publication in LMP
Simple advecting structures and the edge of chaos in subcritical tokamak plasmas
Creators: name: McMillan, Ben F.
name: Pringle, Chris C. T.
name: Teaca, Bogdan
Publisher: name: arXiv
Year: 2018
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: In tokamak plasmas, sheared flows perpendicular to the driving temperature gradients can strongly stabilize linear modes. While the system is linearly stable, regimes with persistent nonlinear turbulence may develop, i.e. the system is subcritical. A perturbation with small but finite amplitude may be sufficient to push the plasma into a regime where nonlinear effects are dominant and thus allow sustained turbulence. The minimum threshold for nonlinear instability to be triggered provides a criterion for assessing whether a tokamak is likely to stay in the quiescent (laminar) regime. At the critical amplitude, instead of transitioning to the turbulent regime or decaying to a laminar state, the trajectory will map out the edge of chaos. Surprisingly, a quasi-traveling-wave solution is found as an attractor on this edge manifold. This simple advecting solution is qualitatively similar to, but simpler than, the avalanche-like bursts seen in earlier turbulent simulations and provides an insight into how turbulence is sustained in subcritical plasma systems. For large flow shearing rate, the system is only convectively unstable, and given a localised initial perturbation, will eventually return to a laminar state at a fixed spatial location.
The Impact of Dependence on Queueing Systems
Creators: name: Civelek, Ismail
name: Biller, Bahar
name: Wolf, Alan
Publisher: name: Carnegie Mellon University
Year: 2000
Subjects: subject: 150399 Business and Management not elsewhere classified
subject: FOS: Economics and business

description: The effect of dependence is mostly ignored in queueing systems due to the difficulty in its analysis; the existing studies about dependent queueing systems have restrictive assumptions, such as considering only the M/M/1 queue with order of dependence lag-1 in interarrival and service times. In this paper, we conduct a simulation study to observe the impact of dependence in a single server queue, by using different probability distributions and higher orders of dependence. For generating multivariate input for our simulation, we use Vector-Auto-Regressive-to-Anything (VARTA) method that has never been used in queueing systems. We invesitage nonmonotonic behavior of the performance of a single server queue with autocorrelated service times, which is a known observation in the literature but it hasn’t been explained by using VARTA as a novel approach to generate multivariate input.