cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Performance Evaluation of a Combined Floating Offshore Energy System (CFOES) in Operational and Extreme Conditions
Creators: name: Cutler, J
Publisher: name: Liverpool John Moores University
Year: 2024

description: The holistic aim of this thesis is to broaden knowledge on the coupled behaviour of a combined floating offshore energy system (CFOES) that supports three different offshore renewable energy (ORE) systems. In this work, a CFOES concept is innovated and tested using numerical simulation under typical design load cases. The three systems include a catamaran type floating wind turbine, a wave energy converter system, and a tidal turbine system. Currently, no numerical tools exist explicitly for the design and analysis of such a system. Thus, numerical tools used purposed for pure ORE systems are integrated together in order to create a sophisticated numerical model of the CFOES. The numerical model is built within FAST2AQWA (F2A). F2A is an aero-hydro-servo-elastic tool used for the design and analysis of floating wind turbines. The tool is based on the integration of a commercial wind turbine simulator, FAST, into a commercial hydrodynamic analysis software tool, ANSYS AQWA. AQWA is effective at studying multibody hydrodynamics and has modelling features such as fenders and joints which allow the simulation of linear WEC PTO systems. AQWA also provides a built-in DLL capability which is used for external force calculations. This function permits the calculation of the aerodynamic forces of the wind turbine and hydrodynamic forces of the tidal turbines. Together, the combination of these capabilities enables the construction of an integrated numerical model of a triple CFOES. The numerical model is used to perform integrated loads analysis for operational and extreme conditions. It was found in rated and above rated conditions, the performance of the wind turbine in the CFOES improves compared to a floating wind turbine. The power output is greater and smoother and there is less variability in aerodynamic thrust, rotor torque and blade pitch. The WEC system significantly reduces platform rolling and pitching in more energetic sea states. For certain conditions, the WEC system reduces the roll motion of the platform by 66%. Consequently, the side-side tower-base bending moment of the wind turbine is reduced. A reduction of 35% and 40% in the maximum and minimum was observed. When the tidal turbines are in operation a hydrodynamic thrust is produced. As a result of this, the global surge response is increased and so is mooring line tension. However, the variability about the mean surge is reduced because of added hydrodynamic damping. Finally, the mean additional power that could be generated by the tidal and wave energy systems was up to 30%. The numerical results demonstrated several important advantages in ORE hybridization including increased energy yield, reduced structural loading, nd improved floating platform stability. This work provides a solid basis for future study involving advanced design and analysis of CFOESs that are comprised of three or more ORE systems.
title: ADCO, Cartulaire du prieuré Notre-Dame de Bonvaux, dépendant du Val-des-Ecoliers (XVe siècle), Dijon, Cart. 228 (27 H), 68 folios, 109 actes (1211-1356), f. 0128
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2011
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: cartulaire
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: Cartulaire du prieuré Notre-Dame de Bonvaux, dépendant du Val-des-Ecoliers (XVe siècle), Dijon, Archives départementales de la Côte-d'Or, Cart. 228 (27 H), 68 folios, 109 actes (1211-1356). Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Cartulaire du prieuré Notre-Dame de Bonvaux, dépendant du Val-des-Ecoliers (XVe siècle), Dijon, Archives départementales de la Côte-d'Or, Cart. 228 (27 H), 68 folios, 109 actes (1211-1356), f. 0128, in Projet CBMA - Corpus Burgundiae Medii Aevi \[Ressource en ligne\], https:// manuscrits.cbma-project.eu/
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb15250518p
description: Provenance: Dijon
description: Provenance: http://www.idref.fr/02643413X/id
description: Provenance: https://www.geonames.org/6453767
description: Provenance: http://www.wikidata.org/entity/Q7003
Friction Control by Adsorption of Polymer Brush Nanoparticles
Creators: name: Riley, John K.
Publisher: name: Carnegie Mellon University
Year: 2016
Subjects: subject: 90499 Chemical Engineering not elsewhere classified
subject: FOS: Chemical engineering

description: This dissertation investigates the adsorption of polymer brush nanoparticles (BNPs) at the solid/liquid interface and interactions between BNP coated surfaces undergoing compression and sliding. BNPs are a class of materials defined by their nanoscale core and surrounding spherical brush layer of polymer arms. BNPs developed in this dissertation are created using atom transfer radical polymerization (ATRP) and include polymer grafted silica nanoparticles, star polymers with a corona of arms crosslinked with a dense hydrophobic core, and star polymers with arms emanating from a multi-functional molecular core. Assemblies of BNPs at the solid liquid interface can attain relatively low or high surface coverages which, when paired with a responsive polymer brush nanoparticle, enables additional control of interactions between BNP adsorbed layers via tunable surface coverage and particle-surface bridging forces. Strategies for controlling the adsorption and packing of these BNPs are presented, and surface forces between BNP coated surfaces are measured to assess each type of BNP’s ability to control friction and adhesion between silica surfaces. Direct adsorption strategies which produce single BNP type adsorbed layers, and sequential adsorption strategies which form surfactant/BNP, polyelectrolyte/BNP, and BNP/BNP mixed layers are employed to generate a full suite of surface coatings with uniquely-engineered structural, frictional, and adhesive characteristics.
Thyanta immemor Kirkaldy
Creators: name: Rider, D. A.
name: Chapin, J. B.
Publisher: name: Zenodo
Year: 1991
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Pentatomidae
Thyanta
Thyanta immemor

description: Thyanta immemor Kirkaldy, nomen dubium
Pentatoma inconspicua Dallas, 1851: 250.
Thyanta inconspicua: Lethierry and Severin, 1893:148.
Thyanta immemor Kirkaldy, 1909:94; Jensen-Haarup, 1928:187-188 (replacement name).
Dallas (1851) described T. inconspicua without giving a type locality. Kirkaldy (1909) transferred the species to Thyanta, and renamed it T. immemor, without commenting on either the name change or the transfer to Thyanta. Jensen-Haarup (1928), evidently unaware of the name change, included T. inconspicua in his key to species, but the couplet is essentially a repeat of Dallas' original description and no locality is given.
Although many of Dallas' type specimens still exist and are housed in the British Museum of Natural History, the type of T. inconspicua was not located. Dallas' original description is fairly detailed and contains several characters which would preclude this from being a species of Thyanta. Dallas described T. inconspicua as having six lines ofbrown punctures on the head and a red spot on the ventral surface of the abdomen. These characters have not been observed in any specimen of Thyanta. This species may be valid, but it is doubtful that it belongs in Thyanta.
description: Published as part of Rider, D. A. & Chapin, J. B., 1991, Revision Of The Genus Thyanta Stal, 1862 (Heteroptera: Pentatomidae) I. South America, pp. 1-77 in J. New York Entomol. Soc. 99 on page 72
The Enigma behind the Good–Turing formula
Creators: name: Balabdaoui, Fadoua
name: Kulagina, Yulia
Publisher: name: Mathematisches Forschungsinstitut Oberwolfach
Year: 2021

description: Finding the total number of species in a population based on a finite sample is a difficult but practically important problem. In this snapshot, we will attempt to shed light on how during World War II, two cryptanalysts, Irving J. Good and Alan M. Turing, discovered one of the most widely applied formulas in statistics. The formula estimates the probability of missing some of the species in a sample drawn from a heterogeneous population. We will provide some intuition behind the formula, show its wide range of applications, and give a few technical details.
description: Snapshots of modern mathematics from Oberwolfach;2021-08
Frame-Free Continuum Thermomechanics
Creators: name: Seguin, Brian
Publisher: name: Carnegie Mellon University
Year: 2010
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: The principle of material frame-indifference is a fundamental concept in classical physics. In 1972 Walter Noll showed that one can formulate constitutive laws without using any external frames of reference. Constitutive laws formulated in this way vacuously satisfy the principle of material frame-indifference. This thesis describes the basic concepts involved in formulating frame-free continuum thermomechanics and presents a framework for formulating constitutive laws for simple materials that take into account thermal effects. The restrictions coming from the second law of thermodynamics on the constitutive laws for materials with fading memory are found using the Coleman{Noll procedure. Also, it is shown that materials with fading memory, when subjected to slow processes, can be approximated by what I call thermoelasto-viscous materials, which are also studied in detail.
Efficient coverage planning for full-area C-ITS communications based on radio propagation simulation and measurement tools
Creators: name: Ußler, Hagen
name: Setzefand, Christian
name: Kanis, Daniel
name: Schwarzbach, Paul
name: Michler, Oliver
Publisher: name: arXiv
Year: 2022
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Intelligent infrastructure, currently often consisting of C-ITS stations and prospectively supplemented by 5G, is a key-enabler for application-oriented and area-wide realization of highly automated and connected driving. For this, radio coverage along the routes must be ensured, leading to high demands on location- and radio-specific planning and parameterization of roadside units (RSU). Hence, this paper presents efficient planning, measurement and evaluation methods for RSU coverage outlining, allowing economically efficient and technically secured planning of intelligent infrastructure. Necessary scientific technical steps are showcased along a 3.5 km testbed for automated and connected driving in rural environments. First, a radio propagation simulation based on a 3D environment model and its electro-magnetic properties is performed, allowing the examination and optimization of RSU quantity as well as site and antenna selection. Additionally, the necessary calibration of simulation results based on continuous wave (CW) and C-ITS service measurements in both lab-based and real-world scenarios is presented.
description: Research paper presented at 27th ITS World Congress, Hamburg, Germany, 11 - 15 October 2021
Fracture of a Brittle-Particle Ductile Matrix Composite with Applications to a Coating System
Creators: name: Bianculli, Steven
Publisher: name: Carnegie Mellon University
Year: 2016
Subjects: subject: Mechanical Engineering
subject: FOS: Mechanical engineering

description: In material systems consisting of hard second phase particles in a ductile matrix, failure initiating from cracking of the second phase particles is an important failure mechanism. This dissertation applies the principles of fracture mechanics to consider this problem, first from the standpoint of fracture of the particles, and then the onset of crack propagation from fractured particles. This research was inspired by the observation of the failure mechanism of a commercial zinc-based anti-corrosion coating and the analysis was initially approached as coatings problem. As the work progressed it became evident that failure mechanism was relevant to a broad range of composite material systems and research approach was generalized to consider failure of a system consisting of ellipsoidal second phase particles in a ductile matrix. The starting point for the analysis is the classical Eshelby Problem, which considered stress transfer from the matrix to an ellipsoidal inclusion. The particle fracture problem is approached by considering cracks within particles and how they are affected by the particle/matrix interface, the difference in properties between the particle and matrix, and by particle shape. These effects are mapped out for a wide range of material combinations. The trends developed show that, although the particle fracture problem is very complex, the potential for fracture among a range of particle shapes can, for certain ranges in particle shape, be considered easily on the basis of the Eshelby Stress alone. Additionally, the evaluation of cracks near the curved particle/matrix interface adds to the existing body of work of cracks approaching bi-material interfaces in layered material systems. The onset of crack propagation from fractured particles is then considered as a function of particle shape and mismatch in material properties between the particle and matrix. This behavior is mapped out for a wide range of material combinations. The final section of this dissertation qualitatively considers an approach to determine critical particle sizes, below which crack propagation will not occur for a coating system that exhibited stable cracks in an interfacial layer between the coating and substrate.
Gluon GPDs and Exclusive Photoproduction of a Quarkonium in Forward Region
Creators: name: Cui, Z. L.
name: Hu, M. C.
name: Ma, J. P.
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Forward photoproduction of $J/ψ$ can be used to extract Generalized Parton Distributions(GPD's) of gluons. We analyze the process at twist-3 level and study relevant classifications of twist-3 gluon GPD's. At leading power or twist-2 level the produced $J/ψ$ is transversely polarized. We find that at twist-3 the produced $J/ψ$ is longitudinally polarized. Our study shows that in high energy limit the twist-3 amplitude is only suppressed by the inverse power of the heavy quark mass relatively to the twist-2 amplitude. This indicates that the power correction to the cross-section of unpolarized $J/ψ$ can have a sizeable effect. We have also derived the amplitude of the production of $h_c$ at twist-3, but the result contains end-point singularities. The production of other quarkonia has been briefly discussed.
description: Discussions of results are added
Induced-Gravity GUT-Scale Higgs Inflation in Supergravity
Creators: name: Pallis, Constantinos
name: Shafi, Qaisar
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Models of induced-gravity inflation are formulated within Supergravity employing as inflaton the Higgs field which leads to a spontaneous breaking of a U(1)B-L symmetry at Mgut=2x10^16 GeV. We use a renormalizable superpotential, fixed by a U(1) R symmetry, and Kahler potentials which exhibit a quadratic non-minimal coupling to gravity with or without an independent kinetic mixing in the inflaton sector. In both cases we find inflationary solutions of Starobinsky type whereas in the latter case, others (more marginal) which resemble those of linear inflation arise too. In all cases the inflaton mass is predicted to be of the order of 10^13~GeV. Extending the superpotential of the model with suitable terms, we show how the MSSM mu parameter can be generated. Also, non-thermal leptogenesis can be successfully realized, provided that the gravitino is heavier than about 10 TeV.
description: arXiv admin note: text overlap with arXiv:1710.05759; Final version
Supersymmetric Higgs Bosons at the Limit
Creators: name: Elliott, T.
name: King, S. F.
name: White, P. L.
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We obtain an improved upper bound on the lightest neutral CP-even Higgs boson mass from a low energy renormalisation-group analysis of the Higgs sector of the next-to-minimal supersymmetric standard model. We find $m_h< 145$ GeV for $m_t=90$ GeV, decreasing to $m_h< 123$ GeV for $m_t=180$ GeV. We also discuss the light Higgs spectrum in the region of parameter space close to the upper bound.
description: 15 pages of plain LaTeX, 6 figures as uuencoded compressed tar file, SHEP 92/93-11
Finite-size scaling of synchronized oscillation on complex networks
Creators: name: Hong, Hyunsuk
name: Park, Hyunggyu
name: Tang, Lei-Han
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The onset of synchronization in a system of random frequency oscillators coupled through a random network is investigated. Using a mean-field approximation, we characterize sample-to-sample fluctuations for networks of finite size, and derive the corresponding scaling properties in the critical region. For scale-free networks with the degree distribution $P(k)\sim k^{-γ}$ at large $k$, we found that the finite size exponent $\barν$ takes on the value 5/2 when $γ>5$, the same as in the globally coupled Kuramoto model. For highly heterogeneous networks ($3
description: 7 pages
Formalizing and Enforcing Purpose Restrictions
Creators: name: Tschantz, Michael Carl
Publisher: name: Carnegie Mellon University
Year: 2012
Subjects: subject: 89999 Information and Computing Sciences not elsewhere classified
subject: FOS: Computer and information sciences

description: Privacy policies often place restrictions on the purposes for which a governed entity may use personal information. For example, regulations, such as the Health Insurance Portability and Accountability Act (HIPAA), require that hospital employees use medical information for only certain purposes, such as treatment, but not for others, such as gossip. Thus, using formal or automated methods for enforcing privacy policies requires a semantics of purpose restrictions to determine whether an action is for a purpose. We provide such a semantics using a formalism based on planning. We model planning using a modified version of Markov Decision Processes (MDPs), which exclude redundant actions for a formal definition of redundant. We argue that an action is for a purpose if and only if the action is part of a plan for optimizing the satisfaction of that purpose under the MDP model. We use this formalization to define when a sequence of actions is only for or not for a purpose. This semantics enables us to create and implement an algorithm for automating auditing, and to describe formally and compare rigorously previous enforcement methods. We extend this formalization to Partially Observable Markov Decision Processes (POMDPs) to answer when information is used for a purpose. To validate our semantics, we provide an example application and conduct a survey to compare our semantics to how people commonly understand the word “purpose”.
title: ADCO, Comptes du Petit-Cîteaux (1477-1491) (11 H 1179), f. 00048
Creators: name: de la Côte d'Or, Archives départementales
name: CBMA/CG21/F.PETOT/2019
name: Petot, Frédéric
name: Archives Départementales De La Côte-D'Or
name: Archives Départementales De La Côte D'Or
name: Petot, Frédérique
name: Projet CBMA
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: cartulaire
subject: comptes

description: Comptes du Petit-Cîteaux (1477-1491), Archives départementales de la Côte-d'Or, (11 H 1179). Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Comptes du Petit-Cîteaux (1477-1491), Archives départementales de la Côte-d'Or, (11 H 1179), f. 00048, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https://manuscrits.cbma-project.eu/
description: Provenance: https://www.geonames.org/3024876
description: Provenance: http://www.idref.fr/030974844/id
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb12228351v
description: Provenance: abbaye de Cîteaux
description: Provenance: http://www.wikidata.org/entity/Q843261
Photon-Photon Scattering, Pion Polarizability and Chiral Symmetry
Creators: name: Donoghue, John F.
name: Holstein, Barry R.
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Recent attempts to detect the pion polarizability via analysis of $γγ\rightarrowππ$ measurements are examined. The connection between calculations based on dispersion relations and on chiral perturbation theory is established by matching the low energy chiral amplitude with that given by a full dispersive treatment. Using the values for the polarizability required by chiral symmetry, predicted and experimental cross sections are shown to be in agreement.
description: 21 pages(+10 figures available on request), LATEX, UMHEP-383
The Journal of Social Media for Learning Summer 2021 Edition - Editorial
Creators: name: Irving-Bell, Dawne
name: Beckingham, Sue
name: McLain, Matt
name: Wooff, David
Publisher: name: figshare
Year: 2021
Subjects: subject: 130306 Educational Technology and Computing
subject: FOS: Educational sciences
subject: Education
subject: 130101 Continuing and Community Education
subject: 130108 Technical, Further and Workplace Education
subject: 130103 Higher Education
subject: 130303 Education Assessment and Evaluation

description: Editorial piece for the summer 2021 edition of the Journal of Social Media for Learning. (Link to Full Journal Below).
(Volume 2, Edition 1)
Entangling power of two-qubit unitary operations
Creators: name: Shen, Yi
name: Chen, Lin
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The entangling power of a bipartite unitary operation shows the maximum created entanglement with the product input states. For an arbitrary two-qubit unitary operation, it is sufficient to consider its normalized operation $U$ with parameters $c_0,c_1,c_2$ and $c_3$. We show how to compute the entangling power of $U$ when $c_2=c_3$. In particular we construct the analytical expressions of entangling power of such $U$ for two examples. We also construct the entangling power of bipartite unitary operations of Schmidt rank two for any dimensions.
description: 27pages, 2 figures
Thyanta humilis subsp. viridescens Kuhlgatz 1891
Creators: name: Rider, D. A.
name: Chapin, J. B.
Publisher: name: Zenodo
Year: 1991
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Pentatomidae
Thyanta
Thyanta humilis
Thyanta humilis viridescens kuhlgatz

description: Thyanta humilis viridescens Kuhlgatz, nomen dubium
Thyanta humilis var. viridescens Kuhlgatz, 1903:256-257; Kirkaldy, 1909:94.
Kuhlgatz (1903) described viridescens as a variety of T. humilis. Although his description is fairly detailed for its time, this taxon cannot be identified with any certainty. The type specimens may have been destroyed during World War I or II. Kuhlgatz listed the distribution of viridescens as being from Panama to Guayaquil, Ecuador. The present study has placed T. humilis as a junior synonym of T. patruelis, which occurs from central Brazil and southern Peru to Argentina. So, it is unlikely that viridescens is a subspecies of humilis (=patruelis). Thyanta humilis viridescens should be considered a nomen dubium.
description: Published as part of Rider, D. A. & Chapin, J. B., 1991, Revision Of The Genus Thyanta Stal, 1862 (Heteroptera: Pentatomidae) I. South America, pp. 1-77 in J. New York Entomol. Soc. 99 on page 73
Non group-theoretical semisimple Hopf algebras from group actions on fusion categories
Creators: name: Nikshych, Dmitri
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics

description: Given an action of a finite group G on a fusion category C we give a criterion for the category of G-equivariant objects in C to be group-theoretical, i.e., to be categorically Morita equivalent to a category of group-graded vector spaces. We use this criterion to answer affirmatively the question about existence of non group-theoretical semisimple Hopf algebras asked by P. Etingof, V. Ostrik, and the author in math/0203060. Namely, we show that certain Z/2Z-equivariantizations of fusion categories constructed by D. Tambara and S. Yamagami are equivalent to representation categories of non group-theoretical semisimple Hopf algebras. We describe these Hopf algebras as extensions and show that they are upper and lower semisolvable.
description: LaTeX, 15 pages
Thermoelectric performance of topological boundary modes
Creators: name: Böhling, Sina
name: Engelhardt, Georg
name: Platero, Gloria
name: Schaller, Gernot
Publisher: name: arXiv
Year: 2018
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate quantum transport and thermoelectrical properties of a finite-size Su-Schrieffer-Heeger model, a paradigmatic model for a one-dimensional topological insulator, which displays topologically protected edge states. By coupling the model to two fermionic reservoirs at its ends, we can explore the non-equilibrium dynamics of the system. Investigating the energy-resolved transmission, the current and the noise, we find that these observables can be used to detect the topologically non-trivial phase. With specific parameters and asymmetric reservoir coupling strengths, we show that we can dissipatively prepare the edge states as stationary states of a non-equilibrium configuration. In addition, we point out that the edge states can be exploited to design a refrigerator driven by chemical work or a heat engine driven by a thermal gradient, respectively. These thermal devices do not require asymmetric couplings and are topologically protected against symmetry-preserving perturbations. Their maximum efficiencies significantly exceed that of a single quantum dot device at comparable coupling strengths.
description: 16 pages, 8 figures, to appear in PRB
A Closed Bianchi I Universe in String Theory
Creators: name: Kaloper, Nemanja
Publisher: name: arXiv
Year: 1992
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A special Bianchi I universe is constructed in $~4D~$ string theory. Geometrically it represents a $~3D~$ anti-de-Sitter space crossed with a flat direction whereas in terms of an associated conformal field theory it is an extremal case of a gauged WZWN theory with target the coset $~SU(1,1) \times R^2 / R~$. Some of its properties are discussed.
description: 9 pages plain TeX (More typos corrected, a reference added in Ref. [3], and a new equation (Eq. 7) and some clarifications included)
A characteristic energy scale in glasses
Creators: name: Lerner, Edan
name: Bouchbinder, Eran
Publisher: name: arXiv
Year: 2018
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Glasses feature a broad distribution of relaxation times and activation energies without an obvious characteristic scale. At the same time, macroscopic quantities such as Newtonian viscosity and nonlinear plastic deformation, are interpreted in terms of a characteristic energy scale, e.g. an effective temperature-dependent activation energy in Arrhenius relations. Nevertheless, despite its fundamental importance, such a characteristic energy scale has not been robustly identified. Inspired by the accumulated evidence regarding the crucial role played by soft quasilocalized excitations in glassy dynamics, we propose that the bulk average of the glass response to a localized force dipole defines such a characteristic energy scale. We show that this characteristic glassy energy scale features remarkable properties: $(i)$ It increases dramatically with decreasing temperature of equilibrium supercooled states, significantly surpassing the corresponding increase in the shear modulus, dismissing the common view that structural variations in supercooled liquids upon vitrification are minute $(ii)$ Its variation with annealing and system size is very similar in magnitude and form to that of the energy of the softest non-phononic vibrational mode, thus establishing a very unusual relation between a rare glassy fluctuation and a bulk average $(iii)$ It exhibits striking dependence on spatial dimensionality and system size, due to the long-ranged fields associated with quasilocalization, which are speculated to be related to peculiarities of the glass transition in two dimensions. In addition, we identify a truly-static growing lengthscale associated with the characteristic glassy energy scale, and discuss possible connections between the increase of this energy scale and the slowing down of dynamics near the glass transition temperature. Open questions and future directions are discussed.
description: 16 pages, 13 figures
Reheating neutron stars with the annihilation of self-interacting dark matter
Creators: name: Chen, Chian-Shu
name: Lin, Yen-Hsun
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Compact stellar objects such as neutron stars (NS) are ideal places for capturing dark matter (DM) particles. We study the effect of self-interacting DM (SIDM) captured by nearby NS that can reheat it to an appreciated surface temperature through absorbing the energy released due to DM annihilation. When DM-nucleon cross section $σ_{χn}$ is small enough, DM self-interaction will take over the capture process and make the number of captured DM particles increased as well as the DM annihilation rate. The corresponding NS surface temperature resulted from DM self-interaction is about hundreds of Kelvin and is potentially detectable by the future infrared telescopes. Such observations could act as the complementary probe on DM properties to the current DM direct searches.
description: 16 pages, 4 figures, major revision, accepted by JHEP
Anomalous thermalization and transport in disordered interacting Floquet systems
Creators: name: Roy, Sthitadhi
name: Lev, Yevgeny Bar
name: Luitz, David J.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Local observables in generic periodically driven closed quantum systems are known to relax to values described by periodic infinite temperature ensembles. At the same time, ergodic static systems exhibit anomalous thermalization of local observables and satisfy a modified version of the eigenstate thermalization hypothesis (ETH), when disorder is present. This raises the question, how does the introduction of disorder affect relaxation in periodically driven systems? In this work, we analyze this problem by numerically studying transport and thermalization in an archetypal example. We find that thermalization is anomalous and is accompanied by subdiffusive transport with a disorder dependent dynamical exponent. Distributions of matrix elements of local operators in the eigenbases of a family of effective time-independent Hamiltonians, which describe the stroboscopic dynamics of such systems, show anomalous departures from predictions of ETH signaling that only a modified version of ETH is satisfied. The dynamical exponent is shown to be related to the scaling of the variance of these distributions with system size.
description: 7 pages, 8 figures, version published in Phys. Rev. B (Rapid Communication)
The running of the bare coupling in SU(N) gauge theories
Creators: name: Allton, Chris
name: Teper, Michael
name: Trivini, Aurora
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: For N>4 there is a first order bulk transition that cleanly separates the strong and weak coupling regimes of SU(N) lattice gauge theories with the plaquette action. We find that in this case the calculated string tension can be readily fitted throughout the weak coupling region by a standard 3-loop perturbative expression modified by lattice spacing corrections of the expected form. While our fits demand the presence of the latter, they are not constraining enough to tell us which of the various bare coupling schemes is a `good' one, in the sense that terms in the beta-function beyond 3-loops are indeed negligible (in the relevant range of scales). To resolve this ambiguity we work in SU(3), using the Schrodinger Functional coupling scheme as a benchmark, and find that the Parisi mean-field improved coupling scheme matches it very well. Using the latter scheme, we have fitted the values of the string tension that have been calculated for SU(3) to SU(8), to obtain Lambda_MSbar/sqrt(sigma) = 0.503(2)(40) + 0.33(3)(3)/N**2, where the first error is statistical and the second is our estimate of the systematic error from all sources.
description: 7 pages, 5 figures, talk at Lattice 2007
Thyanta vitrea
Creators: name: Rider, D. A.
name: Chapin, J. B.
Publisher: name: Zenodo
Year: 1991
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Pentatomidae
Thyanta
Thyanta vitrea

description: Thyanta vitrea (Westwood)
Pentatoma vitrea Westwood, 1837:36; Lethierry and Severin, 1893: 199.
Thyanta vitrea: Distant, 1900a:812; Kirkaldy, 1909:95; Jensen-Haarup, 1928:13.
Westwood (1837) described Pentatoma vitrea from "Brasilia?." The description is very short and not adequate for accurate placement ofthis species. The type specimen, which is conserved in the Hope Entomological Collections, Oxford University, England, was examined. It lacks the abdomen, and its condition is too poor to properly place this species within Thyanta. In fact, it may actually be a species of the closely related genus Cyptocephala.
description: Published as part of Rider, D. A. & Chapin, J. B., 1991, Revision Of The Genus Thyanta Stal, 1862 (Heteroptera: Pentatomidae) I. South America, pp. 1-77 in J. New York Entomol. Soc. 99 on page 73
Harmonic emission from cluster nanoplasmas subject to intense short laser pulses
Creators: name: Popruzhenko, S. V.
name: Kundu, M.
name: Zaretsky, D. F.
name: Bauer, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: Harmonic emission from cluster nanoplasmas subject to short intense infrared laser pulses is studied. In a previous publication [M. Kundu et al., Phys. Rev. A 76, 033201 (2007)] we reported particle-in-cell simulation results showing resonant enhancements of low-order harmonics when the Mie plasma frequency of the ionizing and expanding cluster resonates with the respective harmonic frequency. Simultaneously we found that high-order harmonics were barely present in the spectrum, even at high intensities. The current paper is focused on the analytical modeling of the process. We show that dynamical stochasticity owing to nonlinear resonance inhibits the emission of high order harmonics.
description: 12 pages, 7 figures, RevTeX
Force Propagation in Mammalian Cell Systems and the Relevance of the Mechanically Integrated Cell
Creators: name: Armiger, Travis J.
Publisher: name: Carnegie Mellon University
Year: 2018
Subjects: subject: 90499 Chemical Engineering not elsewhere classified
subject: FOS: Chemical engineering

description: Mammalian cells are known to respond to both extra- and intra- cellular forces as well as the physical properties of the surrounding tissue. There is increasing evidence to support the fundamental role of force, applied to or generated within cells, in maintaining proper tissue function. The mechanical integration from the exterior of a cell to the interior of the nucleus is crucial for cellular sensing of, and response to, the physical environment. Further, misregulation of this mechanosensitive ability can lead to the development or propagation of many diseases such as cancers, cardiovascular diseases, and tissue fibrosis. In this thesis, we investigate the role of various proteins in regulating the mechanical properties of mammalian cells. We also develop techniques to examine the propagation of forces through cells and multicell systems with the aim of elucidating critical biophysical factors involved in regulating cell function. The idea that the genome can be regulated through changes in forces applied to cells or changes in the propagation of forces through a cell, (i.e. mechanotransduction) is becoming widely accepted. The complex interplay between biochemical and biophysical mechanisms that ultimately control mechanotransduction are beginning to be uncovered; however, a true understanding of this remarkable cellular process has not yet been achieved. By investigating multiple factors which impact mechanosensitivity (such as protein expression, cell-cell and cell-environment connections, cell generated contractions, and physical connections through the cellular interior), we aim to further the understanding of potential pathways of mechanotransduction. Through novel studies and technological advances, the field of cellular biomechanics will continue to grow as we hope to uncover the physical mechanisms that regulate cell function or lead to disease.
title: 24 GHz wearable antenna design for wireless body area Networks: An investigation of on-body channel characterisation and Zigbee protocol at 24 GHz
Creators: name: Ali, Mubasher
Publisher: name: University of Kent
Year: 2024

description: User-centric networks drive the evolution of wireless communication, demanding constant connectivity and services across various domains. MM-wave (24 GHz ISM band) frequencies emerge as a promising solution for WBAN, overcoming challenges posed by the on-body radio channel and achieving reliable communication in diverse environments. This thesis uses multiple antennas to characterise the mm-wave (24 GHz) radio propagation channel for body-centric communication. The aim is to design compact antennas insensitive to human skin and structural deformation, exploring system-level modelling of Zigbee's PHY and MAC layers in the context of mm-wave (24 GHz) Body Area Networks (BWAN). 

The first part introduces innovative on-body antenna designs, incorporating split square-ring electromagnetic bandgap (EBG) structures and bow-tie slot antennas, demonstrating high insensitivity to body proximity and bending. The study also proposes Koch fractal antennas backed by EBG structures for improved performance and stable radiation patterns suitable for on-skin mounting. The second part analyses 24 GHz on-body communication system performance and path loss modelling, considering various antenna types. Measurement campaigns confirm the significance of antenna diversity and position in mm-wave propagation on the human body, predicting potential performance for 24 GHz ISM band WBAN systems. The third part evaluates Zigbee protocol performance in body-centric wireless communication within the 24 GHz channel model. Results show good radio link quality for physiological sensor nodes, with lower performance observed in NLOS and PLOS scenarios due to body tissue obstruction. Throughput performance highlights the importance of sensor positioning and MAC layer optimisation.

This thesis advances 24 GHz ISM band WBANs through innovative antennas, introducing 24 GHz path loss modeling, and insights into Zigbee (physical layer and MAC) protocol. It drives future research in advanced designs, propagation modelling, and protocol enhancements, boosting on-body wireless communication capabilities.
The Farthest Quasar Mini-BAL Outflow from its Central Source: VLT/UVES Observation of SDSSJ0242+0049
Creators: name: Byun, Doyee
name: Arav, Nahum
name: Hall, Patrick B.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyze VLT/UVES observations of the quasar SDSS J024221.87+004912.6. We identify four absorption outflow systems: a CIV BAL at $v\approx -18,000 \text{ km s}^{-1}$, and three narrower low-ionization systems with centroid velocities ranging from -1200 to -3500 km s$^{-1}$. These outflows show similar physical attributes to the [OIII] outflows studied by arXiv:1305.6922. We find that two of the systems are energetic enough to contribute to AGN feedback, with one system reaching above 5% of the quasar's Eddington luminosity. We also find that this system is at a distance of 67 kpc away from the quasar, the farthest detected mini-BAL absorption outflow from its central source to date. In addition, we examine the time variability of the BAL, and find that its velocity monotonically increases, while the trough itself becomes shallower over time.
description: 14 pages, 6 figures, accepted for publication in ApJ
Separation of Maxwell equations in Kerr-NUT-(A)dS spacetimes
Creators: name: Krtouš, Pavel
name: Frolov, Valeri P.
name: Kubizňák, David
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper we explicitly demonstrate separability of the Maxwell equations in a wide class of higher-dimensional metrics which include the Kerr-NUT-(A)dS solution as a special case. Namely, we prove such separability for the most general metric admitting the principal tensor (a non-degenerate closed conformal Killing-Yano 2-form). To this purpose we use a special ansatz for the electromagnetic potential, which we represent as a product of a (rank 2) polarization tensor with the gradient of a potential function, generalizing the ansatz recently proposed by Lunin. We show that for a special choice of the polarization tensor written in terms of the principal tensor, both the Lorenz gauge condition and the Maxwell equations reduce to a composition of mutually commuting operators acting on the potential function. A solution to both these equations can be written in terms of an eigenfunction of these commuting operators. When incorporating a multiplicative separability ansatz, it turns out that the eigenvalue equations reduce to a set of separated ordinary differential equations with the eigenvalues playing a role of separability constants. The remaining ambiguity in the separated equations is related to an identification of D-2 polarizations of the electromagnetic field. We thus obtained a sufficiently rich set of solutions for the Maxwell equations in these spacetimes.
description: 36 pages, no figures [v2: a note on the Proca field added; v3: misprint corrections, references updated]
Astrophysical radio background cannot explain the EDGES 21-cm signal: constraints from cooling of non-thermal electrons
Creators: name: Sharma, Prateek
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Recently the EDGES experiment has claimed the detection of an absorption feature centered at 78 MHz. When interpreted as a signature of cosmic dawn, this feature appears at the correct wavelength (corresponding to a redshift range of $z\approx15-20$) but is larger by at least a factor of two in amplitude compared to the standard 21-cm models. One way to explain the excess radio absorption is by the enhancement of the diffuse radio background at $ν= 1.42$ GHz ($λ=21$ cm) in the rest frame of the absorbing neutral hydrogen. Astrophysical scenarios, based on the acceleration of relativistic electrons by accretion on to supermassive black holes (SMBHs) and by supernovae (SN) from first stars, have been proposed to produce the enhanced radio background via synchrotron emission. In this Letter we show that either the synchrotron or the inverse-Compton (IC) cooling time for such electrons is at least three orders of magnitude shorter than the duration of the EDGES signal centered at $z \approx 17$, irrespective of the magnetic field strength. The synchrotron radio emission at 1.42 GHz due to rapidly cooling electrons is $\sim 10^3$ times smaller than the non-cooling estimate. Thus astrophysical scenarios for excess radio background proposed to explain the EDGES signal appear very unlikely.
description: 5 pages, 2 figures; version accepted to MNRAS Letters
Tuneable hopping and nonlinear cross-Kerr interactions in a high-coherence superconducting circuit
Creators: name: Kounalakis, M.
name: Dickel, C.
name: Bruno, A.
name: Langford, N. K.
name: Steele, G. A.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Analog quantum simulations offer rich opportunities for exploring complex quantum systems and phenomena through the use of specially engineered, well-controlled quantum systems. A critical element, increasing the scope and flexibility of such experimental platforms, is the ability to access and tune in situ different interaction regimes. Here, we present a superconducting circuit building block of two highly coherent transmons featuring in situ tuneable photon hopping and nonlinear cross-Kerr couplings. The interactions are mediated via a nonlinear coupler, consisting of a large capacitor in parallel with a tuneable superconducting quantum interference device (SQUID). We demonstrate the working principle by experimentally characterising the system in the single- and two-excitation manifolds, and derive a full theoretical model that accurately describes our measurements. Both qubits have high coherence properties, with typical relaxation times in the range of 15 to 40 microseconds at all bias points of the coupler. Our device could be used as a scalable building block in analog quantum simulators of extended Bose-Hubbard and Heisenberg XXZ models, and may also have applications in quantum computing such as realising fast two-qubit gates and perfect state transfer protocols.