cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Effects of linear Central potential induced by Lorentz symmetry breaking on a generalized Klein-Gordon Oscillator
Creators: name: Ahmed, Faizuddin
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Physics (physics.gen-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the generalized Klein-Gordon oscillator under the Lorentz symmetry breaking effects where, a linear electric and constant magnetic field is considered and analyze its effects on the relativistic quantum oscillator. Furthermore, the behavior of the quantum oscillator in the presence of a Cornell-type scalar potential is analyzed and the solution of the bound state is obtained. We see that the analytical solution to the generalized Klein-Gordon oscillator can be achieved and the angular frequency of the oscillator depends on the quantum numbers of the system
description: 17 pages, no figure
The Volume of the Past Light-Cone and the Paneitz Operator
Creators: name: Park, Sohyun
name: Woodard, R. P.
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study a conjecture involving the invariant volume of the past light-cone from an arbitrary observation point back to a fixed initial value surface. The conjecture is that a 4th order differential operator which occurs in the theory of conformal anomalies gives $8π$ when acted upon the invariant volume of the past light-cone. We show that an extended version of the conjecture is valid for an arbitrary homogeneous and isotropic geometry. First order perturbation theory about flat spacetime reveals a violation of the conjecture which, however, vanishes for any vacuum solution of the Einstein equation. These results may be significant for constructing quantum gravitational observables, for quantifying the back-reaction on spacetime expansion and for alternate gravity models which feature a timelike vector field.
description: 22 pages, no figures, 5 tables. Version 2 substantially extended to cover nonzero spatial curvature, and with simplified derivations
ФРАЗЕОЛОГИЗМЫ КАК ОТРАЖЕНИЕ НАЦИОНАЛЬНО-КУЛЬТУРНЫХ РАЗЛИЧИЙ КОРЕЙСКОГО И РУССКОГО ЯЗЫКОВ.
Creators: name: Urokova, Fazilat
Publisher: name: Zenodo
Year: 2023

description: Тезис посвящен выявлению национально-культурных особенностей корейских и русских фразеологизмов. В данной статье рассматриваются основные отличия фразеологических систем двух языков, а также трудности, возникающие при сопоставлении русских и корейских фразеологических единиц. Сопоставление фразеологизмов различных языков имеет практический смысл для изучающих корейский язык как иностранный, в аспекте лингвокультурологии.
Exploring the Effect of Visual Cues on Eye Gaze During AR-Guided Picking and Assembly Tasks
Creators: name: Seeliger, Arne
name: Merz, Gerrit
name: Holz, Christian
name: Feuerriegel, Stefan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: In this paper, we present an analysis of eye gaze patterns pertaining to visual cues in augmented reality (AR) for head-mounted displays (HMDs). We conducted an experimental study involving a picking and assembly task, which was guided by different visual cues. We compare these visual cues along multiple dimensions (in-view vs. out-of-view, static vs. dynamic, sequential vs. simultaneous) and analyze quantitative metrics such as gaze distribution, gaze duration, and gaze path distance. Our results indicate that visual cues in AR significantly affect eye gaze patterns. Specifically, we show that the effect varies depending on the type of visual cue. We discuss these empirical results with respect to visual attention theory.
description: Paper accepted at the 2021 IEEE International Symposium on Mixed and Augmented Reality Adjunct (ISMAR-Adjunct) Copyright 2021 IEEE
Searching for sur through Sufi-Islamic Devotion
Creators: name: Naqvi, Wajiha Ather
Publisher: name: Dastavezi | The Audio-Visual South Asia
Year: 2022

description: Drawing on my vocal training experiences from my on-going Hindustani classical music apprenticeship under a Qawwali practitioner in Karachi, Pakistan, since 2016, this multi-mediated essay, which includes an audio recording of my performance, demonstrates how specific ideas of Sufi-Islamic devotion are cultivated and embodied in Hindustani classical music through both song lyrics and bodily actions. Through this piece, my attempt is to dispel certain unfounded public misconceptions within Pakistan on music’s compatibility with Islam, particularly with respect to the Pakistani state’s complicated relationship towards its Hindustani classical music heritage.
description: Dastavezi | The Audio-Visual South Asia, Vol. 4 (2022):
Aerodynamics of an in-flight football using 3D particle tracking velocimetry
Creators: name: Butcher, Daniel
name: Morris, James
name: Hollis, Dave
name: Charogiannis, Alex
name: Nila, Alex
name: Harland, Andy
Publisher: name: Loughborough University
Year: 2024

description: Engineering of Sport 15 - Proceedings from the 15th International Conference on the Engineering of Sport (ISEA 2024)
In ball sports played at all levels, aerodynamics plays a key role. The understanding and capitalisation of these aerodynamic phenomena is evident across many sports; for example the swing of a ball in cricket or the curved flight-path of a football. It is therefore important that sports equipment behaves in a predictable and desirable way. In football for example, there are standards which govern the performance of balls with regards circumference, sphericity, rebound, water absorption, weight and pressure loss (FIFA Quality mark), but not that specifically govern in-flight behaviour of the ball. Goff (2010) provides a high level summary of the aerodynamic phenomena relevant to football. Many studies have been carried out over the last two decades and make use of wind tunnel methods, using a force balance connected to a static or spinning ball to measure drag and side force on balls of different designs. This technique allows a straight-forward quanitification of the aerodynamic behaviours of football designs for example work by Hong and Asai which show that the aerodynamic behaviour is dependant on not only panel design, but also orientation of the ball. Further studies have visualised and quantified the flow field around the ball in a wind tunnel using Particle Image Velocimetry (PIV), which allow the flow structures and shedding around the ball to be visualised and provide understanding to the ball behaviour. However, many of these studies feature balls which are fixed in position in a wind tunnel whereas in flight the ball with vary in velocity, spin and orientation. In this work, we present a new approach to measure the flow characteristics of a ball in free flight conditions.
Flow under a function and discrete decomposition of properly infinite W*-algebras
Creators: name: Phillips, William James
Publisher: name: University of British Columbia
Year: 2010

description: The aim of this thesis is to generalize the classical flow under a function construction to non-abelian W*-algebras. We obtain existence and uniqueness theorems for this generalization. As an application we show that the relationship between a continuous and a discrete decomposition of a properly infinite W*-algebra is that of generalized flow under a function. Since continuous decompositions are known to exist for any properly infinite W*-algebra, this leads to generalizations of Connes' results on discrete decomposition.
Electron relaxation in metals: Theory and exact analytical solutions
Creators: name: Kabanov, V. V.
name: Alexandrov, A. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The non-equilibrium dynamics of electrons is of a great experimental and theoretical value providing important microscopic parameters of the Coulomb and electron-phonon interactions in metals and other cold plasmas. Because of the mathematical complexity of collision integrals theories of electron relaxation often rely on the assumption that electrons are in a "quasi-equilibrium" (QE) with a time-dependent temperature, or on the numerical integration of the time-dependent Boltzmann equation. We transform the integral Boltzmann equation to a partial differential Schroedinger-like equation with imaginary time in a one-dimensional "coordinate" space reciprocal to energy which allows for exact analytical solutions in both cases of electron-electron and electron-phonon relaxation. The exact relaxation rates are compared with the QE relaxation rates at high and low temperatures.
description: Citation list has been extended. The paper is submitted to the Physical Review B
Projecting Empowerment: Camera Politics in and beyond Twentieth-Century South Asia
Creators: name: Leuzinger, Mallika
Publisher: name: Dastavezi | The Audio-Visual South Asia
Year: 2022

description: This essay reflects on the ongoing mobilization of the camera as a tool for empowerment in the Global South by revisiting the controversy around Born into Brothels (2004) and its American director’s efforts to teach photography to the children of sex workers in Kolkata. The aesthetic production being demanded and, just as importantly, side-lined by the award-winning film was thrown into relief by the counter-production We are Foot Soldiers (2011), whose irreverent and sceptical energy remains instructive.
description: Dastavezi | The Audio-Visual South Asia, Vol. 4 (2022):
Some specific wormhole solutions in $f(R)$-modified gravity theory
Creators: name: Ghosh, Bikram
name: Mitra, Saugata
name: Chakraborty, Subenoy
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The paper deals with the static spherically symmetric wormhole solutions in $f(R)$-modified gravity theory with anisotropic matter field and for some particular choices for the shape functions. The present work may be considered as an extension of the general formalism in \cite{r15} for finding wormhole solutions. For isotropic matter distribution it has been shown that wormhole solutions are possible for zero tidal force and it modifies the claim in \cite{r17}. Finally energy conditions are examined and it is found that all energy conditions are satisfied in a particular domain with a particular choice of the shape function.
Technical improvements and performances of SpIOMM: an imaging Fourier transform spectrometer for astronomy
Creators: name: Bernier, A. -P.
name: Charlebois, M.
name: Drissen, L.
name: Grandmont, F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the most recent technical improvements on SpIOMM, an Imaging Fourier Transform Spectrometer (IFTS) attached to the 1.6 telescope of the Mont Mégantic Observatory. The recent development of SpIOMM demonstrates that the concept of IFTS for ground telescopes is a promising astronomical 3D spectroscopy technique for multi-object spectroscopy and multi-band imaging. SpIOMM has been developed through a collaboration between Université Laval and the industry (ABB Bomem). It is designed for optical observations from the near UV (350 nm) to the near IR (850 nm) with variable spectral resolution. The circular FOV of the instrument covers 12 arcmin in diameter. We have recently improved the servo system algorithm which now controls the mirror displacement and alignment at a rate of ~7000Hz. Hardware improvements to the servo and the metrology system will be described along with their impacts on performance in the laboratory and in observing conditions. The instrument has successfully been operated at the 1.6 meter telescope this year using the revised control systems and acquired several datacubes. We will discuss some issues regarding the sensitivity to environmental conditions implied by the use of such an instrument. An overview of the datacube reduction procedure will show some solutions proposed for observational problems encountered that affect the quality of the data such as sky transmission variations, wind, changing gravity vector and temperature.
description: 12 pages, 6 figures, to appear in "Ground-based and Airborne Instrumentation for Astronomy II", SPIE conference, Marseille, 23-28 June 2008
Heterotic Resolved Conifolds with Torsion, from Supergravity to CFT
Creators: name: Carlevaro, Luca
name: Israel, Dan
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We obtain a family of heterotic supergravity backgrounds describing non-Kahler warped conifolds with three-form flux and an Abelian gauge bundle, preserving N=1 supersymmetry in four dimensions. At large distance from the singularity the usual Ricci-flat conifold is recovered. By performing a Z_2 orbifold of the T^{1,1} base, the conifold singularity can be blown-up to a four-cycle, leading to a completely smooth geometry. Remarkably, the throat regions of the solutions, which can be isolated from the asymptotic Ricci-flat geometry using a double-scaling limit, possess a worldsheet CFT description in terms of heterotic cosets whose target space is the warped resolved orbifoldized conifold. Thus this construction provides exact solutions of the modified Bianchi identity. By solving algebraically these CFTs we compute the exact tree-level heterotic string spectrum and describe worldsheet non-perturbative effects. The holographic dual of these solutions, in particular their confining behavior, and the embedding of these fluxed singularities into heterotic compactifications with torsion are also discussed.
description: 52 pages, 5 figures; v2: small corrections
Thermodynamic perturbation theory and equation of state developments
Creators: name: Nezbeda, I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: An alternative way of utilizing the thermodynamic perturbation theory of Wertheim for the development of equations of state for associating fluid models is presented and detailed for water. The approach makes use of general features of the parameter of non-saturation to avoid the necessary solution of an algebraic equation and unbinds the results from a tight dependence on details of the simple reference fluid model used in the perturbation theory.
description: 6 pages, 4 figures
Angoricity and compactivity describe the jamming transition in soft particulate matter
Creators: name: Wang, Kun
name: Song, Chaoming
name: Wang, Ping
name: Makse, Hernan A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The application of concepts from equilibrium statistical mechanics to out-of-equilibrium systems has a long history of describing diverse systems ranging from glasses to granular materials. For dissipative jammed systems-- particulate grains or droplets-- a key concept is to replace the energy ensemble describing conservative systems by the volume-stress ensemble. Here, we test the applicability of the volume-stress ensemble to describe the jamming transition by comparing the jammed configurations obtained by dynamics with those averaged over the ensemble as a probe of ergodicity. Agreement between both methods suggests the idea of "thermalization" at a given angoricity and compactivity. We elucidate the thermodynamic order of the jamming transition by showing the absence of critical fluctuations in static observables like pressure and volume. The approach allows to calculate observables such as the entropy, volume, pressure, coordination number and distribution of forces to characterize the scaling laws near the jamming transition from a statistical mechanics viewpoint.
description: 27 pages, 13 figures
Characteristic influence of exceptional points in quantum dynamics
Creators: name: Garmon, Savannah
name: Sawada, Takafumi
name: Noba, Kenichi
name: Ordonez, Gonzalo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We review some recent work on the occurrence of coalescing eigenstates at exceptional points in non-Hermitian systems and their influence on physical quantities. We particularly focus on quantum dynamics near exceptional points in open quantum systems, which are described by an outwardly Hermitian Hamiltonian that gives rise to a non-Hermitian effective description after one projects out the environmental component of the system. We classify the exceptional points into two categories: those at which two or more resonance states coalesce and those at which at least one resonance and the partnering anti-resonance coalesce (possibly including virtual states as well), and we introduce several simple models to explore the dynamics for both of these types. In the latter case of coalescing resonance and anti-resonance states, we show that the presence of the continuum threshold plays a strong role in shaping the dynamics, in addition to the exceptional point itself. We also briefly discuss the special case in which the exceptional point appears directly at the threshold.
description: To be published in J. Phys: Conf. Ser. with the proceedings for virtual series on Pseudo-Hermitian Hamiltonians in Quantum Physics (vPHHQP)
Extreme resistance of super-hydrophobic surfaces to impalement: reversible electrowetting related to the impacting/bouncing drop test
Creators: name: Brunet, P.
name: Lapierre, F.
name: Thomy, V.
name: Coffinier, Y.
name: Boukherroub, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The paper reports on the comparison of the wetting properties of super-hydrophobic silicon nanowires (NWs), using drop impact impalement and electrowetting (EW) experiments. A correlation between the resistance to impalement on both EW and drop impact is shown. From the results, it is evident that when increasing the length and density of NWs: (i) the thresholds for drop impact and EW irreversibility increase (ii) the contact-angle hysteresis after impalement decreases. This suggests that the structure of the NWs network could allow for partial impalement, hence preserving the reversibility, and that EW acts the same way as an external pressure. The most robust of our surfaces show a threshold to impalement higher than 35 kPa, while most of the super-hydrophobic surfaces tested so far have impalement threshold smaller than 10 kPa.
description: 6 pages, 9 figures To appear in Langmuir DOI 10.1021/la801268v (2008)
Theory of random packings
Creators: name: Song, Chaoming
name: Wang, Ping
name: Makse, Hernan A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We review a recently proposed theory of random packings. We describe the volume fluctuations in jammed matter through a volume function, amenable to analytical and numerical calculations. We combine an extended statistical mechanics approach 'a la Edwards' (where the role traditionally played by the energy and temperature in thermal systems is substituted by the volume and compactivity) with a constraint on mechanical stability imposed by the isostatic condition. We show how such approaches can bring results that can be compared to experiments and allow for an exploitation of the statistical mechanics framework. The key result is the use of a relation between the local Voronoi volume of the constituent grains and the number of neighbors in contact that permits a simple combination of the two approaches to develop a theory of random packings. We predict the density of random loose packing (RLP) and random close packing (RCP) in close agreement with experiments and develop a phase diagram of jammed matter that provides a unifying view of the disordered hard sphere packing problem and further shedding light on a diverse spectrum of data, including the RLP state. Theoretical results are well reproduced by numerical simulations that confirm the essential role played by friction in determining both the RLP and RCP limits. Finally we present an extended discussion on the existence of geometrical and mechanical coordination numbers and how to measure both quantities in experiments and computer simulations.
description: 9 pages, 5 figures. arXiv admin note: text overlap with arXiv:0808.2196
The spherical space form problem
Creators: name: Murray, David William
Publisher: name: University of British Columbia
Year: 2010

description: This thesis is intended to be a fairly complete account of the spherical space form problem - both in its classical sense and its more general modern formulation. In 1891, Killing posed the Clifford-Klein spherical space form problem, essentially as follows: Find and classify up to isometry all complete, connected, Riemannian manifolds of constant positive curvature. In 1925, Hopf showed this problem is equivalent to finding all finite groups G which can act fixed point freely on spheres by isometries. A natural generalization of this problem is obtained by relaxing the condition that G act by isometries; for example, we may seek free topological actions of finite groups on spheres, the so-called "topological spherical space form problem". An explicit solution of the Clifford-Klein spherical space form problem was first obtained by Wolf in his book "Spaces of Constant Curvature". After a preliminary .chapter on the relationship between group cohomology and free actions of groups on spheres, we discuss Wolf's work in chapter 2. We then turn to the topological spherical space form problem, and present a "homotopy version" due to Swan in chapter 3. In chapter 4, we give a necessary condition for free topological actions due to Milnor, and briefly discuss some pertinent work of Petrie and of Lee. In the fifth and final chapter, we discuss work of Madsen, Thomas, and Wall which determines sufficient conditions for free actions of finite groups on spheres. These conditions are of a type frequently encountered in classical group theory; their effect is to limit the types of subgroups which G may possess.
KMD Opus Økonomi
Creators: Brøndby kommune
Herlev kommune
Albertslund kommune
Hvidovre kommune
Rødovre kommune
Vallensbæk kommune
Fredensborg kommune
Hillerød kommune
Køge kommune
Halsnæs kommune
Solrød kommune
Odsherred kommune
Kalundborg kommune
Stevns kommune
Sorø kommune
Lejre kommune
Vordingborg kommune
Kerteminde kommune
Svendborg kommune
Nordfyns kommune
Langeland kommune
Ærø kommune
Fanø kommune
Varde kommune
Fredericia kommune
Horsens kommune
Herning kommune
Holstebro kommune
Lemvig kommune
Struer kommune
Norddjurs kommune
Favrskov kommune
Odder kommune
Samsø kommune
Skanderborg kommune
Ringkøbing-Skjern kommune
Morsø kommune
Brønderslev kommune
Vesthimmerlands kommune
Rebild kommune
Jammerbugt kommune
Publisher: name: Rigsarkivet
Year: 2022

description: KMD Opus Økonomi er et system til varetagelse af kommunens økonomi.
Robustness of Highly Entangled Multi-Qubit States Under Decoherence
Creators: name: Borras, A.
name: Majtey, A. P.
name: Plastino, A. R.
name: Casas, M.
name: Plastino, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the decay of entanglement, due to decoherence, of multi-qubit systems that are initially prepared in highly (in some cases maximally) entangled states. We assume that during the decoherence processes each qubit of the system interacts with its own, independent environment. We determine, for systems with a small number of qubits and for various decoherence channels, the initial states exhibiting the most robust entanglement. We also consider a restricted version of this robustness optimization problem, only involving states equivalent under local unitary transformations to the |GHZ> state.
description: 16 pages, 3 figures. Changes in Sec. 3
Phenomenological aspects of the exotic $T$ quark in 331 models
Creators: name: Cabarcas, J. M.
name: Dumm, D. Gomez
name: Martinez, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the context of 331 models we analyze the phenomenology of exotic $T$ quarks with electric charge 2/3. We establish bounds for the corresponding masses and mixing angles and study the decay modes $T\to bW$, $tZ$ and $qH$. It is found that the decays into scalars are strongly dependent on the model parameters, and can be the dominant ones in a scenario with approximate flavor symmetry.
description: 11 pages, 2 figures
Effective noise reduction techniques for disconnected loops in Lattice QCD
Creators: name: Bali, Gunnar S.
name: Collins, Sara
name: Schaefer, Andreas
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Many Lattice QCD observables of phenomenological interest include so-called all-to-all propagators. The computation of these requires prohibitively large computational resources, unless they are estimated stochastically. This is usually done. However, the computational demand can often be further reduced by one order of magnitude by implementing sophisticated unbiased noise reduction techniques. We combine both well known and novel methods that can be applied to a wide range of problems. We concentrate on calculating disconnected contributions to nucleon structure functions, as one realistic benchmark example. In particular we determine the strangeness contributions to the nucleon, , and to the spin of the nucleon, Delta s.
description: 26 pages, 11 figures, v2: table 6, figs 8b and 9b corrected, typos corrected, references updated
Parker Solar Probe Observations of Helical Structures as Boundaries for Energetic Particles
Creators: name: Pecora, F.
name: Servidio, S.
name: Greco, A.
name: Matthaeus, W. H.
name: McComas, D. J.
name: Giacalone, J.
name: Joyce, C. J.
name: Getachew, T.
name: Cohen, C. M. S.
name: Leske, R. A.
name: Wiedenbeck, M. E.
name: McNutt, R. L.
name: Hill, M. E.
name: Mitchell, D. G.
name: Christian, E. R.
name: Roelof, E. C.
name: Schwadron, N. A.
name: Bale, S. D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Energetic particle transport in the interplanetary medium is known to be affected by magnetic structures. It has been demonstrated for solar energetic particles in near-Earth orbit studies, and also for the more energetic cosmic rays. In this paper, we show observational evidence that intensity variations of solar energetic particles can be correlated with the occurrence of helical magnetic flux tubes and their boundaries. The analysis is carried out using data from Parker Solar Probe orbit 5, in the period 2020 May 24 to June 2. We use FIELDS magnetic field data and energetic particle measurements from the Integrated Science Investigation of the Sun (\isois) suite on the Parker Solar Probe. We identify magnetic flux ropes by employing a real-space evaluation of magnetic helicity, and their potential boundaries using the Partial Variance of Increments method. We find that energetic particles are either confined within or localized outside of helical flux tubes, suggesting that the latter act as transport boundaries for particles, consistent with previously developed viewpoints.
Modularity map of the network of human cell differentiation
Creators: name: Galvao, Viviane
name: Miranda, Jose G. V.
name: Andrade, Roberto F. S.
name: Andrade, Jose S.
name: Gallos, Lazaros K.
name: Makse, Hernan A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cell Behavior (q-bio.CB)
subject: Molecular Networks (q-bio.MN)
subject: FOS: Biological sciences

description: Cell differentiation in multicellular organisms is a complex process whose mechanism can be understood by a reductionist approach, in which the individual processes that control the generation of different cell types are identified. Alternatively, a large scale approach in search of different organizational features of the growth stages promises to reveal its modular global structure with the goal of discovering previously unknown relations between cell types. Here we sort and analyze a large set of scattered data to construct the network of human cell differentiation (NHCD) based on cell types (nodes) and differentiation steps (links) from the fertilized egg to a crying baby. We discover a dynamical law of critical branching, which reveals a fractal regularity in the modular organization of the network, and allows us to observe the network at different scales. The emerging picture clearly identifies clusters of cell types following a hierarchical organization, ranging from sub-modules to super-modules of specialized tissues and organs on varying scales. This discovery will allow one to treat the development of a particular cell function in the context of the complex network of human development as a whole. Our results point to an integrated large-scale view of the network of cell types systematically revealing ties between previously unrelated domains in organ functions.
description: 32 pages, 7 figures
Single-shot imaging of ultrafast all-optical magnetization dynamics with a spatio-temporal resolution
Creators: name: Zalewski, T.
name: Stupakiewicz, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present a laboratory system for single-shot magneto-optical (MO) imaging of ultrafast magnetization dynamics with high-sensitivity of MO rotation. We create a stack of MO images repeatedly employing a single pair of a pump and defocused probe pulses to induce and visualize MO changes in the sample. Both laser beams are independently wavelength-tunable allowing for a flexible, resonant adjustable two-color pump and probe scheme. To increase the MO contrast the probe beam is spatially filtered. We performed the all-optical switching experiment in Co-doped yttrium iron garnet films (YIG:Co) to demonstrate the capability of the presented method. We determine the spatial-temporal distribution of the effective field of photo-induced anisotropy driving the all-optical switching of the magnetization in YIG:Co film without an external magnetic field. Moreover, using this imaging method, we tracked the process of the laser-induced magnetization precession.
description: 11 pages, 7 figures
Sensum
Creators: Fredericia Kommune
Kobbelgaarden 1
Kompetencekollegiet
Ny Vej
Proaktiv
Støttecenter for døve - Solglimt
Værestedet Stoppestedet
Opgangsbofællesskabet Frejasvej 7
Opgangsbofællesskabet Friggsvej 7
Opgangsbofællesskabet Nr. Voldgade 104-106
Lejlighederne Jupitervej 31-45
Nova
Bofællesskabet Ullerupdalvej
Bostøtten
HippoCampus
AspBo
Kobbelgaarden 3
Publisher: name: Rigsarkivet
Year: 2022

description: Formålet med at bruge ressourcer på at oprette og drive it-systemet var, at samle dokumentation på borgere i et it-system fremfor at dokumentere i kina-bøger.
Material-structure integrated design for ultra-broadband microwave metamaterial absorber
Creators: name: Peng, Mengyue
name: Qina, Faxiang
name: Zhou, Liping
name: Wei, Huijie
name: Zhu, Zihao
name: Shen, Xiaopeng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We propose herein a method of material-structure integrated design for broadband absorption of dielectric metamaterial, which is achieved by combination of genetic algorithm and simulation platform. A multi-layered metamaterial absorber with an ultra-broadband absorption from 5.3 to 18 GHz (a relative bandwidth of as high as 109%) is realized numerically and experimentally. In addition, simulated results demonstrate the proposed metamaterial exhibits good incident angle and polarization tolerance, which also are significant criteria for practical applications. By investigating the working principle with theoretical calculation and numerical simulation, it can be found that merging of multiple resonance modes encompassing quarter-wavelength interference cancellation, spoof surface plasmon polariton mode, dielectric resonance mode and grating mode is responsible for a remarkable ultra-broadband absorption. Analysis of respective contribution of material and structure indicates that either of them plays an indispensable role in activating different resonance modes, and symphony of material and structure is essential to afford desirable target performance. The material-structure integrated design philosophy highlights the superiority of coupling material and structure and provides an effective comprehensive optimization strategy for dielectric metamaterials.
description: 26 pages, 8 figures
Object recognition for robotics from tactile time series data utilising different neural network architectures
Creators: name: Bottcher, Wolfgang
name: Machado, Pedro
name: Lama, Nikesh
name: McGinnity, T. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Robots need to exploit high-quality information on grasped objects to interact with the physical environment. Haptic data can therefore be used for supplementing the visual modality. This paper investigates the use of Convolutional Neural Networks (CNN) and Long-Short Term Memory (LSTM) neural network architectures for object classification on Spatio-temporal tactile grasping data. Furthermore, we compared these methods using data from two different fingertip sensors (namely the BioTac SP and WTS-FT) in the same physical setup, allowing for a realistic comparison across methods and sensors for the same tactile object classification dataset. Additionally, we propose a way to create more training examples from the recorded data. The results show that the proposed method improves the maximum accuracy from 82.4% (BioTac SP fingertips) and 90.7% (WTS-FT fingertips) with complete time-series data to about 94% for both sensor types.
Inhalation and deposition of spherical and pollen particles after middle turbinate resection in a human nasal cavity
Creators: name: Inthavong, Kiao
name: Shang, Yidan
name: Del Gaudio, John M.
name: Wise, Sarah K.
name: Edwards, Thomas S.
name: Bradshaw, Kimberley
name: Wong, Eugene
name: Smith, Murray
name: Singh, Narinder
Publisher: name: arXiv
Year: 2021
Subjects: subject: Medical Physics (physics.med-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Middle turbinate resection significantly alters the anatomy and redistributes the inhaled air. The superior half of the main nasal cavity is opened up, increasing accessibility to the region. This is expected to increase inhalation dosimetry to the region during exposure to airborne particles. This study investigated the influence of middle turbinate resection on the deposition of inhaled pollutants that cover spherical and non-spherical particles (e.g. pollen). A computational model of the nasal cavity from CT scans, and its corresponding post-operative model with virtual surgery performed was created. Two constant flow rates of 5_L/min, and 15_L/min were simulated under a laminar flow field. Inhaled particles including pollen (non-spherical), and a spherical particle with reference density of 1000 kg/m3 were introduced in the surrounding atmosphere. The effect of surgery was most prominent in the less patent cavity side, since the change in anatomy was proportionally greater relative to the original airway space. The left cavity produced an increase in particle deposition at a flow rate of 15_L/min. The main particle deposition mechanisms were inertial impaction, and to a lesser degree gravitational sedimentation. The results are expected to provide insight into inhalation efficiency of different aerosol types, and the likelihood of deposition in different nasal cavity surfaces.
Bosted System
Creators: Varde Kommune
Beskæftigelsen
Samstyrken - støtte og vejledning
Samstyrken - Aflastning
Samstyrken - Botilbud
Bo- og Rehabiliteringstilbud Lunden
Center Bøgely
Socialpsykiatrien
Bofællesskab Østbækhjemmet
Publisher: name: Rigsarkivet
Year: 2022

description: Dokumentere den social pædagogiske indsats. Bosted er et fagsystem som er anvendt af udfører tilbuddene.
Non-commutative Hardy inequalities
Creators: name: Hansen, Frank
Publisher: name: arXiv
Year: 2008
Subjects: subject: Operator Algebras (math.OA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 47A63

description: We extend Hardy's inequality from sequences of non-negative numbers to sequences of positive semi-definite operators if the parameter p satisfies 11. Applications to trace functions are given. We introduce the tracial geometric mean and generalize Carleman's inequality. Key words and phrases: Hardy's inequality, positive operator, trace function, geometric mean, Carleman's inequality.
The Area and Population of Cities: New Insights from a Different Perspective on Cities
Creators: name: Rozenfeld, Hernan
name: Rybski, Diego
name: Gabaix, Xavier
name: Makse, Hernan A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The distribution of the population of cities has attracted a great deal of attention, in part because it sharply constrains models of local growth. However, to this day, there is no consensus on the distribution below the very upper tail, because available data need to rely on the "legal" rather than "economic" definition of cities for medium and small cities. To remedy this difficulty, in this work we construct cities "from the bottom up" by clustering populated areas obtained from high-resolution data. This method allows us to investigate the population and area of cities for urban agglomerations of all sizes using clustering methods from percolation theory. We find that Zipf's law (a power law with exponent close to 1) for population holds for cities as small as 12,000 inhabitants in the USA and 5,000 inhabitants in Great Britain. In addition the distribution of city areas is also close to a Zipf's law. We provide a parsimonious model with endogenous city area that is consistent with those findings.
description: 27 pages, 12 figures
A CRITICAL ANALYSIS OF THE CONCEPT OF "LOVE" IN THE NOVEL "DAYS GONE BY" BY ABDULLA QADIRI
Creators: name: Usmonova, Zarina
name: Yodgorova, Maftuna
Publisher: name: Zenodo
Year: 2023

description: This thesis is devoted to the linguistic analysis of the concept of “love” in the novel “Days Gone by” written by a great Uzbek writer Abdulla Qadiri.  "Days Gone By" by Abdulla Qadiri is an exquisite literary masterpiece that delves into the intricacies of human existence, capturing the essence of nostalgia, love, and the passage of time. Through his evocative storytelling, Qadiri takes readers on a journey that transcends boundaries of culture and time, touching the deepest corners of our hearts.
Factorization at the LHC: From PDFs to Initial State Jets
Creators: name: Stewart, Iain W.
name: Tackmann, Frank J.
name: Waalewijn, Wouter J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study proton-(anti)proton collisions at the LHC or Tevatron in the presence of experimental restrictions on the hadronic final state and for generic parton momentum fractions. At the scale Q of the hard interaction, factorization does not yield standard parton distribution functions (PDFs) for the initial state. The measurement restricting the hadronic final state introduces a new scale μ_B << Q and probes the proton prior to the hard collision. This corresponds to evaluating the PDFs at the scale μ_B. After the proton is probed, the incoming hard parton is contained in an initial-state jet, and the hard collision occurs between partons inside these jets rather than inside protons. The proper description of such initial-state jets requires "beam functions". At the scale μ_B, the beam function factorizes into a convolution of calculable Wilson coefficients and PDFs. Below μ_B, the initial-state evolution is described by the usual PDF evolution which changes x, while above μ_B it is governed by a different renormalization group evolution which sums double logarithms of μ_B/Q and leaves x fixed. As an example, we prove a factorization theorem for "isolated Drell-Yan", pp -> Xl+l- where X is restricted to have no central jets. We comment on the extension to cases where the hadronic final state contains a certain number of isolated central jets.
description: 41 pages (19 for everyone + 22 for experts), 16 figures; v2: Notational typos fixed. Added sentences to emphasize that measuring isolated Drell-Yan directly tests the initial state parton shower; v3: typos fixed, journal version
The momentum broadening of energetic partons in an anisotropic plasma
Creators: name: Hauksson, Sigtryggur
name: Jeon, Sangyong
name: Gale, Charles
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The quark-gluon plasma produced in heavy-ion collisions is anisotropic throughout its evolution. This anisotropy changes the physics of jet-medium interaction, making it dependent on the momentum direction of the jet. In this paper we analyze transverse momentum broadening of a jet parton interacting with soft gluons in an anisotropic plasma. Our analysis equally applies to momentum broadening of quasiparticles in kinetic theory. We subtract contribution from instability modes in the deep infrared and discuss how our calculation should be complemented in that regime. The resulting anisotropic collision kernel for momentum broadening is qualitatively different from the equilibrium collision kernel and from the isotropic ansatz used in effective kinetic theory. Because of increased medium screening, there is substantially less transverse broadening at low and intermediate momenta.
description: 17 pages, 11 figures
Phase-field model for the Rayleigh--Taylor instability of immiscible fluids
Creators: name: Celani, Antonio
name: Mazzino, Andrea
name: Muratore-Ginanneschi, Paolo
name: Vozella, Lara
Publisher: name: arXiv
Year: 2008
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The Rayleigh--Taylor instability of two immiscible fluids in the limit of small Atwood numbers is studied by means of a phase-field description. In this method the sharp fluid interface is replaced by a thin, yet finite, transition layer where the interfacial forces vary smoothly. This is achieved by introducing an order parameter (the phase field) whose variation is continuous across the interfacial layers and is uniform in the bulk region. The phase field model obeys a Cahn--Hilliard equation and is two-way coupled to the standard Navier--Stokes equations. Starting from this system of equations we have first performed a linear analysis from which we have analytically rederived the known gravity-capillary dispersion relation in the limit of vanishing mixing energy density and capillary width. We have performed numerical simulations and identified a region of parameters in which the known properties of the linear phase (both stable and unstable) are reproduced in a very accurate way. This has been done both in the case of negligible viscosity and in the case of nonzero viscosity. In the latter situation only upper and lower bounds for the perturbation growth-rate are known. Finally, we have also investigated the weakly-nonlinear stage of the perturbation evolution and identified a regime characterized by a constant terminal velocity of bubbles/spikes. The measured value of the terminal velocity is in perfect agreement with available theoretical prediction. The phase-field approach thus appears to be a valuable tecnhique for the dynamical description of the stages where hydrodynamic turbulence and wave-turbulence enter into play.
description: 18 pages, 11 figures, submitted to Journal of Fluid Mechanics; Changes: corrected typos, corrected acknowledgements
A first-order phase transition at the random close packing of hard spheres
Creators: name: Jin, Yuliang
name: Makse, Hernan A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Randomly packing spheres of equal size into a container consistently results in a static configuration with a density of ~64%. The ubiquity of random close packing (RCP) rather than the optimal crystalline array at 74% begs the question of the physical law behind this empirically deduced state. Indeed, there is no signature of any macroscopic quantity with a discontinuity associated with the observed packing limit. Here we show that RCP can be interpreted as a manifestation of a thermodynamic singularity, which defines it as the "freezing point" in a first-order phase transition between ordered and disordered packing phases. Despite the athermal nature of granular matter, we show the thermodynamic character of the transition in that it is accompanied by sharp discontinuities in volume and entropy. This occurs at a critical compactivity, which is the intensive variable that plays the role of temperature in granular matter. Our results predict the experimental conditions necessary for the formation of a jammed crystal by calculating an analogue of the "entropy of fusion". This approach is useful since it maps out-of-equilibrium problems in complex systems onto simpler established frameworks in statistical mechanics.
description: 33 pages, 10 figures
Electrostatically assisted macroion association
Creators: name: Rescic, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A model system of highly asymmetric polyelectrolyte with directional short-range attractive interactions was studied by canonical Monte Carlo computer simulations. Comparison of MC data with previously published theoretical results shows good agreement. For moderate values of binding energies, which matches those of molecular docking, a dynamic equilibrium between free and dimerized macroions is observed. Fraction of dimerized macroions depends on macroion concentration, binding energy magnitude, and on the valency of small counterions. Divalent counterions induce an effective attraction between macroions and enhance dimerization. This effect is most notable at low to moderate macroion concentrations.
description: 8 pages, 6 figures