cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Gravitational radiation from binary systems in $f(R)$ gravity: A semi-classical approach
Creators: name: Narang, Ashish
name: Mohanty, Subhendra
name: Jana, Soumya
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The rate of energy loss and orbital period decay of quasi-stable compact binary systems are derived in $f(R)$ theory of gravity using the method of a single vertex graviton emission process from a classical source. After linearising the $f(R)$ action written in an equivalent scalar-tensor format in the Einstein frame, we identify the appropriate interaction terms between the massless spin-2 tensor mode, massive scalar mode, and the energy momentum tensor. The definition of the scalar field is related to the $f(R)$ models. Then using the interaction vertex we compute the rate of energy loss due to spin-2 quadrupole radiation, which comes out to be the same as the Peter-Mathews formula with a multiplication factor, and also the energy loss due to the scalar dipole radiation. The total energy loss is the sum of these two contributions. Our derivation is most general as it is applicable for both arbitrary eccentricity of the binary orbits and arbitrary mass of the scalar field. Using the derived theoretical formula for the period decay of the binary systems, we compare the predictions of $f(R)$ gravity and general relativity for the observations of four binary systems, i.e. Hulse-Taylor Binary, PSR J1141-6545, PSR J1738+0333, and PSR J0348+0432. Thus we put bound on three well-known $f(R)$ dark energy models, namely the Hu-Sawicki, the Starobinsky, and the Tsujikawa model. We get the best constraint on $f'(R_0)-1$ (where $R_0$ is the scalar curvature of the Universe at the present epoch) from the Tsujikawa model, i.e $\vert f'(R_0)-1\vert < 2.09\times 10^{-4}$. This bound is stronger than those from most of the astrophysical observations and even some cosmological observations.
description: 21 pages, 1 figure, 2 tables. Matched with published version
Null-curves in R^{2,n} as flat dynamical systems
Creators: name: Latyshev, A. M.
name: Lyakhovich, S. L.
name: Sharapov, A. A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mathematical Physics (math-ph)
subject: Optimization and Control (math.OC)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We prove that the differential equation for the null-curves of pseudo-Euclidean space R^{2,n} defines a flat dynamical system in the sense of optimal control theory. The connection with general gauge theories is briefly discussed.
description: 7 pages
MPEC 2023-Q97 : 2023 QQ3
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 QQ3

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Supplementary Table 1 from Shared stressful experiences affect social proximity in Merino sheep
Creators: name: Keshavarzi, Hamideh
name: Lee, Caroline
name: Dyall, Tim R.
name: Johnson, Mark
name: Campbell, Dana L. M.
Publisher: name: The Royal Society
Year: 2023
Subjects: subject: 60801 Animal Behaviour
subject: FOS: Biological sciences

description: Mean (and standard error) of weather parameters of different cohorts across four study days
Introducing TIGRESS-NCR: I. Co-Regulation of the Multiphase Interstellar Medium and Star Formation Rates
Creators: name: Kim, Chang-Goo
name: Kim, Jeong-Gyu
name: Gong, Munan
name: Ostriker, Eve C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Massive, young stars are the main source of energy that maintains multiphase structure and turbulence in the interstellar medium (ISM), and without this "feedback" the star formation rate (SFR) would be much higher than is observed. Rapid energy loss in the ISM and efficient energy recovery by stellar feedback lead to co-regulation of SFRs and the ISM state. Realistic approaches to this problem should solve the dynamical evolution of the ISM, including star formation, and the input of feedback energy self-consistently and accurately. Here, we present the TIGRESS-NCR numerical framework, in which UV radiation, supernovae, cooling and heating processes, and gravitational collapse are modeled explicitly. We use an adaptive ray tracing method for UV radiation transfer from star clusters represented by sink particles, accounting for attenuation by dust and gas. We solve photon-driven chemical equations to determine the abundances of H (time-dependent) and C/O-bearing species (steady-state), which then set cooling and heating rates self-consistently. Applying these methods, we present high-resolution magnetohydrodynamics simulations of differentially rotating local galactic disks representing typical conditions of nearby star-forming galaxies. We analyze ISM properties and phase distributions and show good agreement with existing multiwavelength galactic observations. We measure midplane pressure components (turbulent, thermal, and magnetic) and the weight, demonstrating that vertical dynamical equilibrium holds. We quantify the ratios of pressure components to the SFR surface density, which we call the feedback yields. The TIGRESS-NCR framework will allow for a wide range of parameter exploration, including low metallicity system.
description: ApJ accepted
Dark Tetrad and Romantic Attachment
Creators: name: Benning, Stephen
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Clinical Psychology
subject: Personality and Social Contexts
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology
subject: attachment
subject: Machiavellianism
subject: narcissism
subject: psychopathy
subject: sadism

description: An examination of how the Dark Tetrad's associations with various relationship factors may be mediated by romantic attachment.
Symplectic embeddings and the lagrangian bidisk
Creators: name: Ramos, Vinicius Gripp Barros
Publisher: name: arXiv
Year: 2015
Subjects: subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics

description: In this paper we obtain sharp obstructions to the symplectic embedding of the lagrangian bidisk into four-dimensional balls, ellipsoids and symplectic polydisks. We prove, in fact, that the interior of the lagrangian bidisk is symplectomorphic to a concave toric domain using ideas that come from billiards on a round disk. In particular, we answer a question of Ostrover. We also obtain sharp obstructions to some embeddings of ellipsoids into the lagrangian bidisk.
description: 31 pages, 4 figures; minor changes to presentation, updated references. To appear in Duke Mathematical Journal
Youth Groups and Military Campaigns: The Russian Effort to Popularize the Annexation of Crimea
Creators: name: Goldsmith, Faith
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2018

description: To date there has been very little analysis done on Network, the Russian pro-Putin youth group (Сеть).  Articles which do mention this group, generally focus on their material events and products.  Yet Nework has a major online presence. This research uses this largely untapped resource to provide insights into Russian propaganda.  The thesis shows how Network was used to popularize the annexation of Crimea with Russian young people and to introduce them to values and ways of thinking that would support the Putin administration.  The main argument is that Network used the annexation to create a new image of Putin in an effort to enhance the popularity of the Putin administration among Russian young people and in particular educated and artistic youth traditionally opposed to conservative and authoritarian-leaning government. The challenge was to rebrand Putin for a new purpose. He needed to become “cooler” in order to appeal to the youth that Network targeted, but at the same time his political agenda had to remain unchanged. Network attempted to do so by riding the wave of patriotism sparked by the annexation of Crimea. The annexation was portrayed as a step in the right direction, that of reclaiming Russia’s historic greatness, the periods when it was respected by the world and had ample influence on its neighbors. Putin’s image was associated with this success.  To analyze the rhetoric and visual propaganda Network presented online, translated excerpts from the group’s website and images from the group’s social media accounts are shown, with symbolism and captions identified. The visual propaganda element is incredibly important. Still images and videos are known to cement messages in their audience’s heads since they can be easily recalled and create a feeling of having witnessed an event. These pieces of rhetoric and visual propaganda are then put in context by comparing them with earlier propaganda efforts. This propaganda effort is rich in implications for those trying to understand the intentions of pro-Putin supporters and the needs of the administration itself. Upticks in propaganda production, especially in regards to popularizing aggression in certain areas or stress on the need to protect ethnic Russians (or even Russian-speakers) outside of Russia, can indicate intentions to act on those areas in the future. The “reunification” of Crimea with the Russian Federation and effort to milk its success as much as possible demonstrate this possibility. It also shows how other facets of Putin’s political agenda may come to be accepted, by being borne along on the tide of exhilaration caused by “regaining” lost territory, and therefore former regional hegemony.
Supplementary Figure 1 from Shared stressful experiences affect social proximity in Merino sheep
Creators: name: Keshavarzi, Hamideh
name: Lee, Caroline
name: Dyall, Tim R.
name: Johnson, Mark
name: Campbell, Dana L. M.
Publisher: name: The Royal Society
Year: 2023
Subjects: subject: 60801 Animal Behaviour
subject: FOS: Biological sciences

description: RTK rovers fitted to the backs of experimental sheep
Carrollian Motion in Magnetized Black Hole Horizons
Creators: name: Gray, Finnian
name: Kubiznak, David
name: Perche, T. Rick
name: Redondo-Yuste, Jaime
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We revisit the motion of massless particles with anyonic spin in the horizon of Kerr--Newman geometry. As recently shown, such particles can move within the horizon of the black hole due to the coupling of charges associated with a 2-parametric central extension of the 2-dimensional Carroll group to the magnetic field generated by the black hole -- the so called "anyonic spin-Hall effect". We show that the previously computed magnetic field is not invariant under Carroll diffeomorphisms and find another result which respects these symmetries of the horizon. We also consider a more astrophysically relevant case of a (weakly charged) rotating back hole placed in a uniform magnetic field, which could, for instance, be induced by the surrounding plasma. We show that a qualitatively similar magnetic field assisted anyonic spin-Hall effect takes place, even in the absence of black hole rotation. The theoretical possibility of a motion induced by a magnetic monopole is also studied.
description: 8 pages, 3 figures
De novo peptide sequencing: Breakthroughs and challenges
Creators: name: Yilmaz, Melih
name: Bittremieux, Wout
name: Kalogeropoulos, Konstantinos
Publisher: name: Zenodo
Year: 2024

description: This workshop will explore cutting-edge techniques in the field of de novo peptide sequencing, highlighting the latest tools, applications, and the opportunities for scientific breakthroughs. De novo peptide sequencing is a powerful technique for determining the amino acid sequence of peptides without prior knowledge of the genome or protein database. It has significant implications for proteomics and the understanding of complex biological processes, including applications in immunopeptidomics, antibody sequencing, metaproteomics, and paleoproteomics. Participants will delve into the state-of-the-art methodologies, examining their strengths, limitations, and areas ripe for innovation. Discussions will cover the diverse applications of de novo sequencing and how they can be used to complement database searches. The workshop aims to foster a vibrant exchange of ideas, encourage collaboration, and identify new research directions in this rapidly evolving field. The workshop will also strive to establish consensus on a transparent and reproducible proving ground for new and existing de novo methods.
NK Cell Cytotoxicity in Influenza-infected Mice with Diet Variations
Creators: name: Saqib, Usman
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2017

description: Obesity is epidemic that affects more than a third of the U.S. population. Additionally, the influenza virus is an infectious disease that affects millions of people and claims a quarter to half a million lives each year. The few studies that have been conducted on these two factors and their effect on immune response have found that obese influenza-infected mice had suppressed immune function in combatting the influenza infection as well as reduced expression of proinflammatory cytokines and decreased NK cell cytotoxicity. In this study, we expand on this topic and explore the effects of NK cell cytotoxicity with diet-induced weight change in influenza-infected mice. One of the goals of this study is to determine if beneficial weight change from a metabolically obese mouse to lean plays a significant role in restoring NK cell function. Upon analyzing the data, we found that weight change did not play a significant role affecting NK cell cytotoxicity. Furthermore, we found that the original weight status of the mouse had similar NK cell function and so mice that were originally lean, regardless of if they underwent weight change, had a significantly greater NK cell cytotoxicity than if the mouse was originally obese. I believe that these studies are relevant to global public health and preventative medicine because if we are able to determine how weight change effects the immune function in influenza-infected models, we will be better able to understand how to help certain individuals based on their weight status.
A cross-sectional study on serum uric acid as an early marker in predicting the mortality and morbidity in patients with sepsis
Creators: name: Dr. Pranav Chaudhari
Publisher: name: Zenodo
Year: 2023
Subjects: Sepsis, Serum uric acid, Prognosis, Biomarker, Organ dysfunction, Early diagnosis

description: Study proforma for the assessment of the study participant of "A cross-sectional study on serum uric acid as an early marker in predicting the mortality and morbidity in patients with sepsis"A cross-sectional study on serum uric acid as an early marker in predicting the mortality and morbidity in patients with sepsis"
Optimal frequency conversion in the nonlinear stage of modulation instability
Creators: name: Bendahmane, A.
name: Mussot, A.
name: Kudlinski, A.
name: Szriftgiser, P.
name: Conforti, M.
name: Wabnitz, S.
name: Trillo, S.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We investigate multi-wave mixing associated with the strongly pump depleted regime of induced modulation instability (MI) in optical fibers. For a complete transfer of pump power into the sideband modes, we theoretically and experimentally demonstrate that it is necessary to use a much lower seeding modulation frequency than the peak MI gain value. Our analysis shows that a record 95 % of the input pump power is frequency converted into the comb of sidebands, in good quantitative agreement with analytical predictions based on the simplest exact breather solution of the nonlinear Schrödinger equation.
Optimizing the transport of Majorana zero modes in one-dimensional topological superconductors
Creators: name: Truong, Bill P.
name: Agarwal, Kartiek
name: Pereg-Barnea, T.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Topological quantum computing is based on the notion of braiding non-Abelian anyons, such as Majorana zero modes (MZMs), to perform gate operations. A crucial building block of these protocols is the adiabatic shuttling of MZMs through topological superconductors. Here, we consider the "piano key" approach, where MZMs are transported using local electric gates to tune sections ("keys") of a wire between topologically trivial and nontrivial phases. We numerically simulate this transport on a single wire and calculate the diabatic error corresponding to exciting the system. We find that this error is typically reduced when transport is facilitated by using multiple keys as one may expect from modeling each piano key press as an effective Landau-Zener process. However, further increasing the number of keys increases errors; thus, there exists a nontrivial optimal number of keys that minimizes the diabatic error given a fixed total shuttle time. As we show, this optimal number of keys can be explained by modeling each key press as an effective Landau-Zener process while paying careful attention to power-law corrections that arise due to the nonanalytic behavior of the time-dependent modulation of the chemical potential at the beginning and end of each key press.
description: 14 pages, 6 figures; v2: updated to reflect referee comments, typos corrected, additional references included. Published version
MPEC 2023-Q98 : 2023 QR3
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 QR3

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Η Νομική Προστασία του Φυσικού και Πολιτιστικού Περιβάλλοντος του Αγίου Όρους
Creators: name: Κουτσουπιάς, Δημήτριος Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2024
Subjects: Άγιο Όρος
Πολιτιστική κληρονομιά
Φυσικό περιβάλλον
Mount Athos
Cultural heritage
Natural environment

description: Με την παρούσα μελέτη επιχειρείται η διερεύνηση της νομικής προστασίας του Φυσικού και Πολιτιστικού περιβάλλοντος του Αγίου Όρους, όπως αυτή κατοχυρώνεται Συνταγματικά, στον ισχύοντα νόμο, στο Αγιορειτικό Δίκαιο και σε διεθνές νομικό επίπεδο. Σκοπός της είναι η συνολική θεώρηση της προστασίας που παρέχεται στο περιβάλλον της Αθωνικής Πολιτείας τόσο αναφορικά με αυτά τούτα τα νομικά κείμενα, όσο και με την εφαρμογή της από τα δικαστήρια. Ως εκ τούτου, τόσο ο σχολιασμός της δέσμης διατάξεων που περικλείουν τις ρυθμίσεις περί της προστασίας του φυσικού πλούτου και της πολιτιστικής κληρονομιάς του Αγίου Όρους, όσο και η παράθεση δικαστικών αποφάσεων, αποσκοπούν στην έκθεση του υπό έρευνα νομικού φαινομένου με τον σαφέστερο δυνατό τρόπο.
description: The present study attempts to investigate the legal protection of the Natural and Cultural Environment of Mount Athos, as it is enshrined in the Greek Constitution, in applicable legislation, in the Mount Athos’ Law and at the international legislative level. Its purpose is to provide a comprehensive view of the protection of the environment of the Athonite State, both in relation to these legal texts and its application by the courts. Therefore, both the commentary on the set of provisions enclosing the regulations on the protection of the natural wealth and cultural heritage of Mount Athos, and the citation of court decisions, aim to expose the legal phenomenon under investigation in the clearest possible way.
Antigo Portugal no Estado Novo: Como um governo cooptou a história nacional
Creators: name: Nusbickel, Alex
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2016

description: No dia 25 de março de 2007, a votação final de uma eleição momentosa acabou em Portugal. Talvez esta eleição não teve impacto político, mas abriu uma janela para a mentalidade portuguesa e a história complexa do país. O programa Grandes Portugueses funcionou para descobrir o “maior português” na opinião do povo português, de todos os portugueses na existência de Portugal (Rádio e Televisão Portuguesa). Em uma vitória esmagadora e chocante, com 41% dos votos, o ex-líder António de Oliveira Salazar foi eleito o maior português dos quase doze séculos da história portuguesa. Alvaro Cunhal, líder do Partido Comunista Português, Aristedes de Sousa Mendes, cônsul português durante a Segunda Guerra Mundial, e D. Afonso Henriques, rei e fundador do Reino de Portugal, ganharam as três posições seguintes, com uma porcentagem do voto semelhante ao número que Salazar acumulou. Esta vitória póstuma e massiva, mais de trinta anos depois da Revolução dos Cravos, enfatiza o impacto poderoso do Estado Novo em Portugal, o regime autocrático que dominou o país por quase meio século, e deixou um legado duradouro na psique portuguesa.
Reexamining closed-form formulae for inclusive breakup: Application to deuteron and $^6$Li induced reactions
Creators: name: Lei, Jin
name: Moro, Antonio M.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The problem of the calculation of inclusive breakup cross sections in nuclear reactions is reexamined. For that purpose, the post-form theory proposed by Ichimura, Austern and Vincent [Phys. Rev. C32, 431 (1985) is revisited, and an alternative derivation of the non-elastic breakup part of the inclusive breakup is presented, making use of the coupled-channels optical theorem. Using the DWBA version of this model, several applications to deuteron and $^6$Li reactions are presented and compared with available data. The validity of the zero-range approximation of the DWBA formula is also investigated by comparing zero-range with full finite-range calculations.
description: 15 pages, 8 figures, updated text and figures; published in Phys. Rev. C
Minimal Zee model for lepton ${g-2}$ and $W$-mass shifts
Creators: name: Primulando, R.
name: Julio, J.
name: Uttayarat, P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a unique Yukawa structure of the Zee model that can accommodate neutrino oscillation data, solves the muon ${g-2}$ problem, and explains the recent $W$ boson mass measurement. Our Yukawa structure is minimal in the sense that it contains the least possible number of parameters. In this minimal scenario, neutrino masses are quasidegenerate and are compatible with both normal and inverted orderings. The mixing angle $θ_{23}$ is predicted to lie in the second (first) octant for normal (inverted) ordering. In both cases, the CP violating phase is close to 3$π/2$. The minimal texture also predicts a large branching fraction of the heavy neutral Higgs boson into a pair of electron and muon.
description: 6 pages, 1 figure. v2 expanded introduction on LFV in the Zee model, references added, to be appeared on PRD. v3 corrected typos, matched PRD version
Towards rigorous analysis of the Levitov-Mirlin-Evers recursion
Creators: name: Fyodorov, Yan. V.
name: Kupiainen, Antti
name: Webb, Christian
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mathematical Physics (math-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: This paper aims to develop a rigorous asymptotic analysis of an approximate renormalization group recursion for inverse participation ratios $P_q$ of critical powerlaw random band matrices. The recursion goes back to the work by Mirlin and Evers [37] and earlier works by Levitov [32, 33] and is aimed to describe the ensuing multifractality of the eigenvectors of such matrices. We point out both similarities and dissimilarities of LME recursion to those appearing in the theory of multiplicative cascades and branching random walks and show that the methods developed in those fields can be adapted to the present case. In particular the LME recursion is shown to exhibit a phase transition, which we expect is a freezing transition, where the role of temperature is played by the exponent $q$. However, the LME recursion has features that make its rigorous analysis considerably harder and we point out several open problems for further study
Tutte Embeddings of Tetrahedral Meshes
Creators: name: Alexa, Marc
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computational Geometry (cs.CG)
subject: Graphics (cs.GR)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: G.2.1; G.2.2; I.3.5
subject: 05C10

description: Tutte's embedding theorem states that every 3-connected graph without a $K_5$ or $K_{3,3}$ minor (i.e. a planar graph) is embedded in the plane if the outer face is in convex position and the interior vertices are convex combinations of their neighbors. We show that this result extends to simply connected tetrahedral meshes in a natural way: for the tetrahedral mesh to be embedded if the outer polyhedron is in convex position and the interior vertices are convex combination of their neighbors it is sufficient (but not necessary) that the graph of the tetrahedral mesh contains no $K_6$ and no $K_{3,3,1}$, and all triangles incident on three boundary vertices are boundary triangles.
Humor and Empathy in Lewis Nordan
Creators: name: Schaper, Madison
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2018

description: Nordan writes often about alcoholics, racists, and even murderers with a sense of empathy that he communicates to his readers with amazing effectiveness. Specifically, Nordan uses humor as a literary device to make each of his characters relatable, creating insight and understanding for them. Furthermore, he establishes a connection between growing up in the Delta, hereafter referred to as “southerness,” and physical disability that allows him to more fully communicate the disadvantages many of his characters are faced with. Nordan’s use of humor in conjunction with the connection he creates between southerness and disability creates empathy and understanding for the residents of Arrow Catcher, many of which would be easy to write off as “racist, ignorant, and culturally backward” otherwise (Grant 1). This paper will explore the way Nordan accomplishes this by examining the way humans use humor as a tool to create distinct social groups, analyzing Nordan’s short stories featuring disabled characters, and considering several of Nordan’s southern white male characters.
Low energy exciton pocket at finite momentum in tetracene molecular solids
Creators: name: Roth, Friedrich
name: Nohr, Markus
name: Hampel, Silke
name: Knupfer, Martin
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The excited state dynamics in organic semiconductors plays an important role for many processes associated with light absorption and emission. We have studied the momentum dependence of the lowest singlet excitons in tetracene molecular solids, an archetype system for other organic semiconductors. Our results reveal an anisotropic bandstructure of these excitons with an energy minimum at finite momentum, i. e., a low energy exciton pocket. The existence of such low energy states might have important consequences for the photophysical behavior, also in view of applications in, e. g., organic solar cells. Our studies stress the importance of momentum dependent considerations in organic systems.
Accounting for Selective Mortality Bias on Health Outcomes: A Case Study of the Great Chinese Famine
Creators: name: Huang, Alice
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2015

description: Using individual-level variation in famine exposure and intensity based on individual month-year-region of birth and historical data on the size of narrowly-defined birth cohorts, I find that exposure to famine negatively impacts adult height, lowers BMI, negatively affects health status, and reduces incidence of serious illness and hypertension. I use Inverse Probability Weighting and Joint Modeling of Longitudinal and Survival Data to account for selective mortality bias in health outcome equations. Contributions are mainly threefold: first, I exploit individual-level variation in timing and length of exposure, which serves as a more precise proxy for famine. Secondly, I include additional health variables into my analysis. Finally, I apply innovative techniques to account for selective mortality bias.
Theoretical and computational analysis of the electrophoretic polymer mobility inversion induced by charge correlations
Creators: name: Yang, Xiang
name: Buyukdagli, Sahin
name: Scacchi, Alberto
name: Sammalkorpi, Maria
name: Ala-Nissila, Tapio
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Electrophoretic (EP) mobility reversal is commonly observed for strongly charged macromolecules in multivalent salt solutions. This curious effect takes place, e.g., when a charged polymer, such as DNA, adsorbs excess counterions so that the counterion-dressed surface charge reverses its sign, leading to the inversion of the polymer drift driven by an external electric field. In order to characterize this seemingly counterintuitive phenomenon that cannot be captured by electrostatic mean-field theories, we adapt here a previously developed strong-coupling-dressed Poisson-Boltzmann approach to the cylindrical geometry of the polyelectrolyte-salt system. Within the framework of this formalism, we derive an analytical polymer mobility formula dressed by charge correlations. In qualitative agreement with polymer transport experiments, this mobility formula predicts that the increment of the monovalent salt, the decrease of the multivalent counterion valency, and the increase of the dielectric permittivity of the background solvent, suppress charge correlations and increase the multivalent bulk counterion concentration required for EP mobility reversal. These results are corroborated by coarse-grained molecular dynamics simulations showing how multivalent counterions induce mobility inversion at dilute concentrations and suppress the inversion effect at large concentrations. This re-entrant behavior, previously observed in the aggregation of like-charged polymer solutions, calls for verification by polymer transport experiments.
description: 14 pages, 9 figures
title: Textilforschung 2020 : Bericht 67
Creators: name: (:Unav)
Publisher: name: Forschungskuratorium Textil e.V.
Year: 2024
Subjects: subject: 677 Textilien

description: Das Jahr 2020 stand auch für die deutsche Textilindustrie ganz im Zeichen der Corona-Pandemie. Viele Unternehmen wurden durch einbrechende Nachfrage oder Lieferengpässe in eine wirtschaftlich schwierige Situation gebracht. Die Textilforschung hingegen war weiterhin sehr dynamisch. So stieg die Nachfrage nach Fördermitteln der IGF weiter deutlich an. Allerdings sind die zur Verfügung stehenden Forschungsmittel nicht in gleichem Maße angestiegen. Des Weiteren hatten die AiF-Gutachter im vergangenen Jahr einen höheren Qualitätsanspruch an die eingereichten Projekte als in den Jahren zuvor und viele Anträge haben die benötigte Punktzahl für eine Bewilligung nicht erreicht. Dieser Trend wird sich auch im Jahr 2021 fortsetzen. Die Finanzsituation des FKT ist trotz Corona positiv. Das beweist, dass das Kuratorium im vergangenen Jahr die richtigen Entscheidungen getroffen hat. So war die Textilforschung in wichtigen Bereichen gut auf die Pandemie vorbereitet und hat auf einigen Zukunftsfeldern sogar als Beschleuniger gewirkt. Bei vielen Anwendungen, beispielsweise Gesundheitstextilien, ist es in den vergangenen Monaten ungewöhnlich schnell zu Ergebnissen gekommen.
Boosting Domain Wall Propagation by Notches
Creators: name: Yuan, H. Y.
name: Wang, X. R.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report a counter-intuitive finding that notches in an otherwise homogeneous magnetic nanowire can boost current-induced domain wall (DW) propagation. DW motion in notch-modulated wires can be classified into three phases: 1) A DW is pinned around a notch when the current density is below the depinning current density. 2) DW propagation velocity is boosted by notches above the depinning current density and when non-adiabatic spin-transfer torque strength $β$ is smaller than the Gilbert damping constant $α$. The boost can be manyfold. 3) DW propagation velocity is hindered when $β> α$. The results are explained by using the Thiele equation.
description: 8 pages, 10 figures
Enhanced cosmic-ray antihelium production from dark matter annihilation through light mediators
Creators: name: Ding, Yu-Chen
name: Li, Nan
name: Zhou, Yu-Feng
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Cosmic-ray (CR) antihelium is an important probe for the indirect search of dark matter (DM) annihilation in the Galaxy. However, due to stringent constraints from the measurements of CR antiprotons and $γ$-rays, the flux of CR antihelium from the conventional DM direct annihilation into Standard Model final states is expected to be far below the sensitivity of the current experiments. We show that the production of antihelium can be significantly enhanced if the DM particles annihilate through light mediator particles with a mass $m_ϕ\approx 8$ GeV close to the antihelium production threshold. After taking into account the constraints from the AMS-02 antiproton data and the Fermi-LAT $γ$-ray data on the spheroidal dwarf galaxies, we find that in this scenario the CR antihelium flux can be enhanced by three orders of magnitude, which makes it within the sensitivity of the ongoing AMS-02 experiment.
description: 20 pages, 5 figures, 3 tables
Numerical study of Heat Transfer Enhancement by Deformable Twin Plates in Laminar Heated Channel flow
Creators: name: Joshi, Rakshitha U.
name: Soti, Atul K.
name: Bhardwaj, Rajneesh
Publisher: name: arXiv
Year: 2015
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Fluid-structure interaction (FSI) of thin flexible fins coupled with convective heat transfer has applications in energy harvesting and in understanding functioning of several biological systems. We numerically investigate FSI of the thin flexible fins involving large-scale flow-induced deformation as a potential heat transfer enhancement technique. An in-house, strongly-coupled fluid-structure interaction (FSI) solver is employed in which flow and structure solvers are based on sharp-interface immersed boundary and finite element method, respectively. We consider twin flexible fins in a heated channel with laminar pulsating cross flow. The vortex ring past the fin sweep higher sources of vorticity generated on the channel walls out into the downstream - promoting the mixing of the fluid. The moving fin assists in convective mixing, augmenting convection in bulk and at the walls; and thereby reducing thermal boundary layer thickness and improving heat transfer at the channel walls. The thermal augmentation is quantified in term of instantaneous Nusselt number at the wall. Results are presented for two limiting cases of thermal conductivity of the fin - an insulated fin and a highly conductive fin. We discuss feasibility of flexible fins and effect of flow cycle-to-cycle variation on the Nusselt number. Finally, we investigate the effect of important problem parameters - Young's Modulus, flow frequency and Prandtl number - on the thermal augmentation.
description: arXiv admin note: text overlap with arXiv:1501.01807
Ultras in Egypt: The Power of Organized Soccer Fans and their Political Influence on the
2011 Egyptian Revolution and Post-Revolution Era
Creators: name: Zikry, Fareeda M.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2014

description: In this thesis, I will investigate how the Ultras, a group of organized and nationalistic
Egyptian football fans who are widely credited with having played a major part in the more
physical aspects of the Egyptian uprising (Woltering 2013), became politicized and significant
actors in the 2011 Egyptian revolution. The Ultras, as hard-core soccer supporters, have the ethos
of fanatical commitment towards their respective clubs (Jerzak 2013). In the case of Egypt, most
of these Ultras are associated with the two largest soccer clubs, Al-Ahly and Al-Zamalek. I will
analyze what political ideologies and social and economic factors have affected the mobilization
of the Ultras, and assess whether the Ultras have specific sustainable political objectives and
organizational leadership strategies to be viable Egyptian political actors. Interrelated factors,
such as political beliefs, socio-economic status, educational level, organizational structure,
gender, and age will be used to understand the coalescence of the Ultras as a significant political
force during and after the 2011 Egyptian Revolution. This analysis will provide a fundamental
understanding of how the Ultras transformed into revolutionary actors, through their autonomy
in public spaces, and why this dissent became an organized and influential political movement
that transitioned from the soccer stadiums to the public forums of political protest. I will use
semi-structured interviews, with academicians and Ultra leaders, and an analysis of published
data and sources to understand how the Ultras transformed into revolutionary actors, and whether
they will have a sustainable and meaningful political impact on the Egyptian political scene.
A Temporal Graph Neural Network for Cyber Attack Detection and Localization in Smart Grids
Creators: name: Haghshenas, Seyed Hamed
name: Hasnat, Md Abul
name: Naeini, Mia
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Systems and Control (eess.SY)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper presents a Temporal Graph Neural Network (TGNN) framework for detection and localization of false data injection and ramp attacks on the system state in smart grids. Capturing the topological information of the system through the GNN framework along with the state measurements can improve the performance of the detection mechanism. The problem is formulated as a classification problem through a GNN with message passing mechanism to identify abnormal measurements. The residual block used in the aggregation process of message passing and the gated recurrent unit can lead to improved computational time and performance. The performance of the proposed model has been evaluated through extensive simulations of power system states and attack scenarios showing promising performance. The sensitivity of the model to intensity and location of the attacks and model's detection delay versus detection accuracy have also been evaluated.
description: 5 pages, 6 figures, accepted at ISGT conference of 2023
Touching the Sore: Older Caribbean women's memories of migration, kinship and settlement in England
Creators: name: Williams, Catherine
Publisher: name: College of Health, Psychology and Social Care (University of Derby)
Year: 2023
Subjects: Caribbean women, migration, family rseparation reunion, settlement

description: Literature on migration has until recently, marginalised or overlooked Black and migrant women’s experiences. Neglect of these perspectives extends to first generation African Caribbean women. African Caribbean women have grown old in Britain and now face the end of their life course in their adopted country. They are passing away and taking their stories with them. The study seeks to explore the narratives of a now aged group of African Caribbean women and to explore their experiences of migration, family separation and reunion during the Windrush era. Some African Caribbean mothers were reunited with their children after a short time, whilst for others the reunion took many years later. Some of the women successfully achieved family reunification but for other families this never took place. The process for many women and mothers was traumatic and fragmented. The project draws on semi-structured interviews with 12 participants featuring life histories and stories of mothering, childcare and work during 1950 and 1960s England. The analysis shows the prolonged stresses to which Black women and mothers who migrate are exposed. As visible minorities, this includes negative ‘race’-based experiences, and the thesis explores the women’s responses, strategies and resiliencies. The findings highlight the intersectional lives and identities of Black women and mothers who migrate for work. The themes of gender, ‘race’ and ethnicity are presented along with the constraints and opportunities migration brings for women. The study explores and re-imagines mothering, family and belonging, in the context of families separated by migration. The study’s conclusion is that the constraining and enabling factors for migrant mothers include navigating both personal racial hostilities and those enacted by the state, compounding their traumatic stress of loss and family separation. It argues that the public sector is part of the system responsible for pulling migrants to Britain and therefore it should act to enhance the support available for women and mothers who migrate.
Decomposition of (co)isotropic relations
Creators: name: Lorand, Jonathan
name: Weinstein, Alan
Publisher: name: arXiv
Year: 2015
Subjects: subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 15A21, 18B10, 53D99

description: We identify thirteen isomorphism classes of indecomposable coisotropic relations between Poisson vector spaces and show that every coisotropic relation between finite-dimensional Poisson vector spaces may be decomposed as a direct sum of multiples of these indecomposables. We also find a list of thirteen invariants, each of which is the dimension of a space constructed from the relation, such that the 13-vector of multiplicities and the 13-vector of invariants are related by an invertible matrix over $\mathbb Z$. It turns out to be simpler to do the analysis above for isotropic relations between presymplectic vector spaces. The coisotropic/Poisson case then follows by a simple duality argument.
description: 9 pages. The final publication is available at Springer via http://dx.doi.org/10.1007/s11005-016-0863-5, in a special issue of Letters in Mathematical Physics dedicated to the memory of Louis Boutet de Monvel. A free, view-only version of the final publication is available under the following link http://rdcu.be/mFXy
Prethermal fragmentation in a periodically driven Fermionic chain
Creators: name: Ghosh, Somsubhra
name: Paul, Indranil
name: Sengupta, K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study a Fermionic chain with nearest-neighbor hopping and density-density interactions, where the nearest-neighbor interaction term is driven periodically. We show that such a driven chain exhibits prethermal strong Hilbert space fragmentation (HSF) in the high drive amplitude regime at specific drive frequencies $ω_m^{\ast}$. This constitutes the first realization of HSF for out-of-equilibrium systems. We obtain analytic expressions of $ω_m^{\ast}$ using a Floquet perturbation theory and provide exact numerical computation of entanglement entropy, equal-time correlation functions, and the density autocorrelation of Fermions for finite chains. All of these quantities indicate clear signatures of strong HSF. We study the fate of the HSF as one tunes away from $ω_m^{\ast}$ and discuss the extent of the prethermal regime as a function of the drive amplitude.
description: v2: 3 figs, 4 pages + appendices. Refs added; minor changes
Channel Estimation Techniques for Diffusion-Based Molecular Communications
Creators: name: Jamali, Vahid
name: Ahmadzadeh, Arman
name: Jardin, Christophe
name: Sticht, Heinrich
name: Schober, Robert
Publisher: name: arXiv
Year: 2015
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In molecular communication (MC) systems, the expected number of molecules observed at the receiver over time after the instantaneous release of molecules by the transmitter is referred to as the channel impulse response (CIR). Knowledge of the CIR is needed for the design of detection and equalization schemes. In this paper, we present a training-based CIR estimation framework for MC systems which aims at estimating the CIR based on the observed number of molecules at the receiver due to emission of a sequence of known numbers of molecules by the transmitter. In particular, we derive maximum likelihood (ML) and least sum of square errors (LSSE) estimators. We also study the Cramer Rao (CR) lower bound and training sequence design for the considered system. Simulation results confirm the analysis and compare the performance of the proposed estimation techniques with the CR lower bound.
description: This paper has been submitted for presentation at IEEE International Conference on Communications (ICC) 2016
Slaveholder Religiosity and African-American Religion in Antebellum Slave Narratives
Creators: name: Stackhouse, Elaine Jeanette
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2016

description: Slave narratives tell stories of shared experiences of hope, disillusionment, joy and despair, experienced by members and descendants of the African diaspora who were subjected to the Trans-Atlantic slave trade. Those experiencing this shared yoke of bondage had varied responses, many of which clung to religious beliefs. Of those who clung to faith as their own response to slavery, a consistent pattern emerges in which authors present a division between the white southern slaveholder’s religiosity and their own personal and communal religion. The stark division that emerges in each of the five narratives discussed in this thesis emphasizes a critique by each author of what they deemed “false” slaveholder religiosity. Each author presents this religious division through compelling and complex personal evidence based upon differing convictions, beliefs, geographical location, moments of religious awakening, and time periods. This thesis will explore how each author presents his or her own method of coping with their realization of a disturbing division between slaveholder religiosity and their own religious beliefs in their narratives.