cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Surface Lifshits tails for random quantum Hamiltonians
Creators: name: Kirsch, Werner
name: Raikov, Georgi
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: Spectral Theory (math.SP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 82B44, 35J10, 35R60, 47B80, 47N55, 81Q10

description: We consider Schrödinger operators on $L^{2}({\mathbb R}^{d})\otimes L^{2}({\mathbb R}^{\ell})$ of the form $ H_ω~=~H_{\perp}\otimes I_{\parallel} + I_{\perp} \otimes {H_\parallel} + V_ω$, where $H_{\perp}$ and $H_{\parallel}$ are Schrödinger operators on $L^{2}({\mathbb R}^{d})$ and $L^{2}({\mathbb R}^{\ell})$ respectively, and $ V_ω(x,y)$ : = $\sum_{ξ\in {\mathbb Z}^{d}} λ_ξ(ω) v(x - ξ, y)$, $x \in {\mathbb R}^d$, $y \in {\mathbb R}^\ell$, is a random 'surface potential'. We investigate the behavior of the integrated density of surface states of $H_ω$ near the bottom of the spectrum and near internal band edges. The main result of the current paper is that, under suitable assumptions, the behavior of the integrated density of surface states of $H_ω$ can be read off from the integrated density of states of a reduced Hamiltonian $H_{\perp}+W_ω$ where $W_ω$ is a quantum mechanical average of $V_ω$ with respect to $y \in {\mathbb R}^\ell$. We are particularly interested in cases when $H_{\perp}$ is a magnetic Schrödinger operator, but we also recover some of the results from [24] for non-magnetic $H_{\perp}$.
description: 21 pages, typos corrected
Les participants du Mouvement du 20 février (Maroc) six ans plus tard: processus de socialisation politique, de désengagement et de reconversion
Creators: name: Beauchesne, Pierre-Luc
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2017
Subjects: Carrières militantes
Conséquences biographiques de l'engagement
Désengagement militant
Maroc
Mouvements sociaux
Politique contestataire
Printemps arabe
Reconversions militantes
Socialisation politique

description: Le Mouvement du 20 février (M20F) qui émerge au Maroc dans le sillage des soulèvements arabes de 2011 a été un moment de socialisation politique pour ses participants : apprentissages, redéfinitions de son rapport à soi et au politique, et mise en réseaux. Toutefois, l’évènement n’a pas marqué de la même façon les carrières militantes des différentes micro-cohortes de participants qui se distinguent quant à leurs expériences militantes passées, leurs positions dans le M20F, et les dispositions extrapolitiques (capitaux scolaires, savoir-faire artistiques, etc.) qu’ils reconvertissent dans le M20F et l’après mobilisation. Les trajectoires des anciens du 20 Février dans l’après-mobilisation se caractérisent par une volonté d’ancrer le mouvement démocratique dans la population et de sortir de l’entre-soi militant par des activités d’éducation populaire. Les jeunes du 20 Février expriment aussi une volonté de modifier les façons de faire des organisations politiques traditionnelles (notamment les partis politiques) et d’accélérer la transmission intergénérationnelle des postes de direction dans ces organisations.
Directional Global Three-part Image Decomposition
Creators: name: Thai, Duy Hoang
name: Gottschlich, Carsten
Publisher: name: arXiv
Year: 2015
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: We consider the task of image decomposition and we introduce a new model coined directional global three-part decomposition (DG3PD) for solving it. As key ingredients of the DG3PD model, we introduce a discrete multi-directional total variation norm and a discrete multi-directional G-norm. Using these novel norms, the proposed discrete DG3PD model can decompose an image into two parts or into three parts. Existing models for image decomposition by Vese and Osher, by Aujol and Chambolle, by Starck et al., and by Thai and Gottschlich are included as special cases in the new model. Decomposition of an image by DG3PD results in a cartoon image, a texture image and a residual image. Advantages of the DG3PD model over existing ones lie in the properties enforced on the cartoon and texture images. The geometric objects in the cartoon image have a very smooth surface and sharp edges. The texture image yields oscillating patterns on a defined scale which is both smooth and sparse. Moreover, the DG3PD method achieves the goal of perfect reconstruction by summation of all components better than the other considered methods. Relevant applications of DG3PD are a novel way of image compression as well as feature extraction for applications such as latent fingerprint processing and optical character recognition.
Entanglement and correlation functions of the quantum Motzkin spin-chain
Creators: name: Movassagh, Ramis
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present exact results on the exactly solvable spin chain of Bravyi et al [Phys. Rev. Lett. 109, 207202 (2012)]. This model is a spin one chain and has a Hamiltonian that is local and translationally invariant in the bulk. It has a unique (frustration free) ground state with an energy gap that is polynomially small in the system's size ($2n$). The half-chain entanglement entropy of the ground state is $\frac{1}{2}\log n+const.$. Here we first write the Hamiltonian in the standard spin-basis representation. We prove that at zero temperature, the magnetization is along the $z-$direction i.e., $\langle s^{x}\rangle=\langle s^{y}\rangle=0$ (everywhere on the chain). We then analytically calculate $\langle s^{z}\rangle$ and the two-point correlation functions of $s^{z}$. By analytically diagonalizing the reduced density matrices, we calculate the Schmidt rank, von Neumann and Rényi entanglement entropies for: 1. Any partition of the chain into two pieces (not necessarily in the middle) and 2. $L$ consecutive spins centered in the middle. Further, we identify entanglement Hamiltonians (Eqs. 49 and 59). We prove a small lemma (Lemma1) on the combinatorics of lattice paths using the reflection principle to relate and calculate the Motzkin walk 'height' to spin expected values. We also calculate the, closely related, (scaled) correlation functions of Brownian excursions. The known features of this model are summarized in a table in Sec.I.
description: 25 pages, 5 figures
Spectra of open waveguides in periodic media
Creators: name: Cardone, G.
name: Nazarov, S. A.
name: Taskinen, J.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35P05, 47A75, 49R50, 78A50

description: We study the essential spectra of formally self-adjoint elliptic systems on doubly periodic planar domains perturbed by a semi-infinite periodic row of foreign inclusions. We show that the essential spectrum of the problem consists of the essential spectrum of the purely periodic problem and another component, which is the union of the discrete spectra of model problems in the infinite perturbation strip; these model problems arise by an application of the partial Floquet-Bloch-Gelfand transform.
description: 33 pages, 7 figures
Wave reflection in dielectric media obeying spatial Kramers-Kronig relations
Creators: name: Longhi, Stefano
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In a recent work, S.A.R. Horsley and coworkers [Nature Photon 9, 436-439 (2015)] showed rather interestingly that planar dielectric media, for which the real and imaginary parts of the dielectric permittivity are related by spatial Kramers-Kronig (KK) relations, are one-way reflectionless, whatever the angle of incidence. Such a fascinating property, besides of extending our comprehension of the fundamental phenomenon of reflection, may offer new ways for the design of antireflection surfaces and thin materials with efficient light absorption. However, KK dielectric media are generally described by slowly-decaying complex permittivity profiles which may introduce some subtle issues in the study of the scattering problem. Here we provide a condition on the imaginary part of the dielectric profile that ensures the existence of proper scattering states and present a proof of the one-way reflectionless property in KK dielectric media which is free from loophole. Finally, we show that instabilities might arise at the interface of KK dielectric media when the medium is not purely dissipative.
description: 6 pages, 2 figures, submitted for publication comments and suggestions on open questions are welcome
An Investigation of Baby Formula Marketing Practices in the Health Care Setting
Creators: name: Johnson, Anne Frances
Publisher: name: University of North Carolina at Chapel Hill
Year: 2011

description: Breastfeeding is widely recognized as the healthiest option for feeding infants. Manufacturers of baby formulas, however, employ multiple marketing tactics to persuade parents to supplement or replace breast milk with commercial formulas. Many health care providers contribute to these marketing efforts either through active promotion or implied endorsement of formulas. In doing so, these health care providers are acting in direct conflict with international recommendations and are, in effect, helping to promote products that are against the best interests of their patients. Although formula marketing in the health care setting is widespread in the United States today, the issue has received only superficial media coverage. Through a series of three stories designed for a print outlet, this thesis aims to shed light on formula marketing practices in health care settings and examine efforts to curb these practices.
Decoupling Uniaxial Prestress and Waveguide Effects from Dynamic Elastography
Creators: name: Salehabadi, Melika
Publisher: name: University of Illinois at Chicago
Year: 2023

description: Dynamic elastography, whether based on magnetic resonance, ultrasound, or optical modalities, attempts to reconstruct quantitative maps of the viscoelastic properties of biological tissue, properties altered by disease and injury, by noninvasively measuring mechanical wave motion in the tissue. Most reconstruction strategies that have been developed neglect boundary conditions, including quasi-static tensile or compressive loading resulting in a nonzero prestress. Significant prestress is inherent to the functional role of some biological tissues currently being studied using elastography, such as skeletal and cardiac muscle, arterial walls, and the cornea. In the present study a configuration, inspired by muscle elastography but generalizable to other applications, is analytically and experimentally studied. A hyperelastic polymer phantom cylinder is statically elongated in the axial direction while its response to vibratory excitation is measured. We examine the interplay between uniaxial prestress and waveguide effects in this muscle-like tissue phantom using computational finite element simulations and magnetic resonance elastography measurements. Finite deformations caused by prestress coupled with waveguide effects lead to results that are predicted by adapting a novel coordinate transformation approach “Transformation Acousto-Elastography” originally developed to simplify the reconstruction of anisotropic properties using elastography. Here, the adapted approach estimates material viscoelastic properties that are independent of the nonhomogeneous prestress conditions without requiring advanced knowledge of those stress conditions.
Worldsheet matter for electric flux strings
Creators: name: Ben-Zion, Daniel
name: Das, Diptarka
name: McGreevy, John
Publisher: name: arXiv
Year: 2015
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We develop a scheme to make exactly solvable gauge theories whose electric flux lines host (1+1)-dimensional topological phases. We use this exact `decorated-string-net' framework to construct several classes of interesting models. In particular, we construct an exactly solvable model of a quantum spin liquid whose (gapped) elementary excitations form doublets under an internal symmetry, and hence may be regarded as spin-carrying spinons. The model may be formulated, and is solvable, in any number of dimensions, on any bipartite graph. Another example, in any dimension, has $Z_2$ topological order and anyons which are Kramers' doublets of time reversal symmetry. Further, we make exactly solvable models of 3d topological paramagnets.
description: 20+12 pages, 2 figures
Efficient Reconstruction of User Sessions from HTTP Traces for Rich Internet Applications
Creators: name: Hooshmand, Salman
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2017
Subjects: User-Interactions Reconstruction
Rich Internet Applications
Traffic Replay
HTTP Traces

description: The generated HTTP traffic of users' interactions with a Web application can be logged for further analysis. In this thesis, we present the ``Session Reconstruction'' problem that is the reconstruction of user interactions from recorded request/response logs of a session. The reconstruction is especially useful when the only available information about the session is its HTTP trace, as could be the case during a forensic analysis of an attack on a website. New Web technologies such as AJAX and DOM manipulation have provided more responsive and smoother Web applications, sometimes called ``Rich Internet Applications''(RIAs). Despite the benefits of RIAs, the previous session reconstruction methods for traditional Web applications are not effective anymore. Recovering information from a log in RIAs is significantly more challenging as compared with classical Web applications, because the HTTP traffic contains often only application data and no obvious clues about what the user did to trigger that traffic. This thesis studies applying different techniques for efficient reconstruction of RIA sessions. We define the problem in the context of the client/server applications, and propose a solution for it. We present different algorithms to make the session reconstruction possible in practice: learning mechanisms to guide the session reconstruction process efficiently, techniques for recovering user-inputs and handling client-side randomness, and also algorithms for detections of actions that do not generate any HTTP traffic. In addition, to further reduce the session reconstruction time, we propose a distributed architecture to concurrently reconstruct a RIA session over several nodes. To measure the effectiveness of our proposed algorithms, a prototype called D-ForenRIA is implemented. The prototype is made of a proxy and a set of browsers. Browsers are responsible for trying candidate actions on each state, and the proxy, which contains the observed HTTP trace, is responsible for responding to browsers' requests and validating attempted actions on each state. We have used this tool to measure the effectiveness of the proposed techniques during session reconstruction process. The results of our evaluation on several RIAs show that the proposed solution can efficiently reconstruct use-sessions in practice.
Halo and Subhalo Demographics with Planck Cosmological Parameters: Bolshoi-Planck and MultiDark-Planck Simulations
Creators: name: Rodriguez-Puebla, Aldo
name: Behroozi, Peter
name: Primack, Joel
name: Klypin, Anatoly
name: Lee, Christoph
name: Hellinger, Doug
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report and provide fitting functions for the abundance of dark matter halos and subhalos as a function of mass, circular velocity, and redshift from the new Bolshoi-Planck and MultiDark-Planck $Λ$CDM cosmological simulations, based on the Planck cosmological parameters. We also report the halo mass accretion rates, which may be connected with galaxy star formation rates. We show that the higher cosmological matter density of the Planck parameters compared with the WMAP parameters leads to higher abundance of massive halos at high redshifts. We find that the median halo spin parameter $λ_{\rm B} = J(2M_{\rm vir}R_{\rm vir}V_{\rm vir})^{-1}$ is nearly independent of redshift, leading to predicted evolution of galaxy sizes that is consistent with observations, while the significant decrease with redshift in median $λ_{\rm P} = J|E|^{-1/2}G^{-1}M^{-5/2}$ predicts more decrease in galaxy sizes than is observed. Using the Tully-Fisher and Faber-Jackson relations between galaxy velocity and mass, we show that a simple model of how galaxy velocity is related to halo maximum circular velocity leads to increasing overprediction of cosmic stellar mass density as redshift increases beyond redshifts $z\sim1$, implying that such velocity-mass relations must change at redshifts $z>1$. By making a realistic model of how observed galaxy velocities are related to halo circular velocity, we show that recent optical and radio observations of the abundance of galaxies are in good agreement with our $Λ$CDM simulations. Our halo demographics are based on updated versions of the \rockstar\ and \ctrees\ codes, and this paper includes appendices explaining all of their outputs. This paper is an introduction to a series of related papers presenting other analyses of the Bolshoi-Planck and MultiDark-Planck simulations.
description: 27 pages, 26 figures. To match the published version at MNRAS. Rockstar and Consistent Trees outputs are available at http://hipacc.ucsc.edu/Bolshoi/MergerTrees.html
Providing data at the National Archive of Data from Official Statistics (ADISP)
Creators: name: Pétorin, Elodie
Publisher: name: Zenodo
Year: 2021

description: The National Archive of Data from Official Statistics, part of the Large Research Infrastructure ProGeDo, has been providing access to social sciences data from more than 20 years. Our mission is to disseminate studies and database produced by Official Statistics to the whole scientific community in order to foster the use of statistical data in social sciences. In the context of the FAIR principle, to facilitate the discovery and re-use of data by humans and information systems, an indexation and contextualization of the data is necessary. In other word, we need to question our documentation processes to disseminate data that are findable, accessible, interoperable and reusable under the DDI standard. Therefore, this presentation will highlight the processes and questions for providing DDI-compliant data in adequation with the FAIR principle. A recorded version of this talk can be found here: https://youtu.be/qe6XSJteWSQ
Justifications and perceived effectiveness of leadership academies within collegiate athletics
Creators: name: Bifulco, Lauren D.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2008

description: The purpose of this study was to establish justifications for leadership academies and examine the effectiveness of athletic leadership academies in fostering good character from the perceptions of head coaches and administrators currently at institutions with Peak Performance leadership academies. The participants were athletic administrators and head coaches at seven Jeff Janssen Sport Leadership Academies; the University of North Carolina at Chapel Hill, University of Pittsburgh, Yale University, Illinois University, Wake Forest University, Winston-Salem State University, and Baylor University. The instrument was a survey created by the researcher with factors that the respondents rated on a Likert scale of one to five. The highest ranked justifications for leadership academies were the need for good character development for leaders and the importance of the responsibilities of team captains. The components of the leadership academies that were found most valuable were the mission statement, the educational programs and workshops offered for student athletes, and the idea of continuing education for student athletes. The results found one significant finding of the difference of means between male and female respondents for the provisional value of the leadership academies. The significance in the non-significant findings is that the idea and programs of the leadership academies are not as well projected as originally believed.
Thermal Comfort in Sun Spaces: To what extend can energy collectors and seasonal energy storages provide thermal comfort in sun space?
Creators: name: Wiegel, Christian
Publisher: name: A+BE | Architecture and the Built Environment
Year: 2017

description: Preparation for fossil fuel substitution in the building sector persists as an essential subject in architectural engineering. Since the building sector still remains as one of the three major global end energy consumer – climate change is closely related to construction and design. We have developed the archetype sun space to what it is today : a simple but effective predominant naturally ventilated sun trap and as well as living space enlargement. With the invention of industrial glass orangery’s more and more changed from frost protecting envelopes to living spaces from which we meantime expect thermal comfort in high quality. But what level of thermal comfort provide sun spaces? And to what extend may sun spaces manage autarkic operation profiting from passive solar gains and, beyond that, surplus energy generation for energy neutral conditioning of aligned spaces? We deliver detailed information for this detected gap of knowledge. We know about limited thermal comfort in sun spaces winter times. This reasons the inspection of manifold collector technologies, which enable to be embedded in facades and specifically in sun space envelopes. Nonetheless, effective façade integrated collectors are ineffective in seasons with poor irradiation. Hence, the mismatch of offer and demand we have experienced with renewable energies ignites thinking about appropriate seasonal energy storages, which enlarges the research scope of this work. This PhD thesis project investigates on both, a yearly empirical test set up analysis and a virtual simulation of different oriented and located sun spaces abroad Germany. Both empirical and theoretical evaluation result in a holistic research focusing on a preferred occupation time in terms of cumulative frequencies of operational temperature and decided local discomfort, of potential autarkic sun space operation and prospective surplus exergy for alternative heating of aligned buildings. The results are mapped geographically for Germany. Fossil fuel substitution, as far as this thesis elaborated, is closely related to quality of thermal comfort, sun space orientation and energetic standard of the aligned building. Unexpectedly, spaces, which define envelopes incorporating collectors in combination with storage technologies both profit and suffer to some extend in respect to thermal comfort. Essentially, we can conclude, that the more area-wise efficient and the more integral the collector technology is incorporated into façade design, the more distinct significance of thermal comfort quality and fossil fuel substitution is. Eventually, this dissertation determines the potential of a new generation of sun spaces in the context of energy transition.
description: A+BE | Architecture and the Built Environment, No. 11 (2017): Thermal comfort in sun spaces
An Ant Colonization Routing Algorithm to Minimize Network Power Consumption
Creators: name: Pérez, Miguel Rodríguez
name: Alonso, Sergio Herrería
name: Veiga, Manuel Fernández
name: García, Cándido López
Publisher: name: arXiv
Year: 2015
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Rising energy consumption of IT infrastructure concerns have spurred the development of more power efficient networking equipment and algorithms. When \emph{old} equipment just drew an almost constant amount of power regardless of the traffic load, there were some efforts to minimize the total energy usage by modifying routing decisions to aggregate traffic in a minimal set of links, creating the opportunity to power off some unused equipment during low traffic periods. New equipment, with power profile functions depending on the offered load, presents new challenges for optimal routing. The goal now is not just to power some links down, but to aggregate and/or spread the traffic so that devices operate in their sweet spot in regards to network usage. In this paper we present an algorithm that, making use of the ant colonization algorithm, computes, in a decentralized manner, the routing tables so as to minimize global energy consumption. Moreover, the resulting algorithm is also able to track changes in the offered load and react to them in real time.
description: Accepted version of the manuscript. 12 pages
The Bilinear Hilbert Transform and Sub-bilinear Maximal Function Along Curves
Creators: name: Gaitan, Yessica
Publisher: name: Purdue University Graduate School
Year: 2023
Subjects: Lie groups, harmonic and Fourier analysis

description: Multi-linear operators play an important role in analysis due to their multiple connections with and applications to other mathematical areas such as ergodic theory, elliptic regularity, and other problems in partial differential equations. Within the area of multi-linear operators, powerful methods were developed originating from the problem of the almost everywhere convergence of Fourier series. Indeed, in their work, Carleson and Fefferman lay the foundation of time-frequency analysis. By further refining their methods, M. Lacey and C. Thiele proved the boundedness of the classical bilinear Hilbert transform for a suitable range of Hölder indices. In this thesis, we consider the general boundedness properties of the bilinear Hilbert transform and the sub-bilinear maximal function along a suitable family of curves. In the first part of our work, we present a short proof of the maximal boundedness range for the sub-bilinear maximal function along non-flat curves, giving a unified treatment of both the singular and the maximal operators. In the second part, we discuss the boundedness of these operators along hybrid curves. This work aims to present a unified perspective that treats the case obtained by joining the zero-curvature features of the operators along flat curves with the non-zero curvature features along non-flat curves.
The general de Sitter supergravity component action
Creators: name: Schillo, Marjorie
name: van der Woerd, Ellen
name: Wrase, Timm
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper we review the appearance and utility of a nilpotent chiral multiplet in the context of supergravity, string theory and cosmology. Coupling a nilpotent chiral superfield to supergravity, one obtains what is called pure dS supergravity, a supergravity theory without scalar degrees of freedom that naturally has de Sitter (dS) solutions, and in which supersymmetry is non-linearly realized. We extend previous results that couple this dS supergravity to chiral and vector multiplets and derive the most general supergravity action for a single nilpotent chiral multiplet coupled to supergravity and an arbitrary number of chiral and vector multiplets.
description: 12 pages. Contribution to the proceedings of the 21st European String Workshop, Leuven, September 7-11, 2015
Generalized Multicast Multibeam Precoding for Satellite Communications
Creators: name: Joroughi, Vahid
name: Vázquez, Miguel Ángel
name: Pérez-Neira, Ana I.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This paper deals with the problem of precoding in multibeam satellite systems. In contrast to general multiuser multiple-input-multiple-output (MIMO) cellular schemes, multibeam satellite architectures suffer from different challenges. First, satellite communications standards embed more than one user in each frame in order to increase the channel coding gain. This leads to the different so-called multigroup multicast model, whose optimization requires computationally complex operations. Second, when the data traffic is generated by several Earth stations (gateways), the precoding matrix must be distributively computed and attain additional payload restrictions. Third, since the feedback channel is adverse (large delay and quantization errors), the precoding must be able to deal with such uncertainties. In order to solve the aforementioned problems, we propose a two-stage precoding design in order to both limit the multibeam interference and to enhance the intra-beam minimum user signal power (i.e. the one that dictates the rate allocation per beam). A robust version of the proposed precoder based on a first perturbation model is presented. This mechanism behaves well when the channel state information is corrupted. Furthermore, we propose a per beam user grouping mechanism together with its robust version in order to increase the precoding gain. Finally, a method for dealing with the multiple gateway architecture is presented, which offers high throughputs with a low inter-gateway communication. The conceived designs are evaluated in a close-to-real beam pattern and the latest broadband communication standard for satellite communications.
Question Search: The missing link between researcher and repository
Creators: name: Krämer, Thomas
name: Akdeniz, Esra
name: Klas, Claus-Peter
name: Hopt, Oliver
name: Mühlbauer, Alexander
name: Friedrichs, Martin
Publisher: name: Zenodo
Year: 2021

description: Once research institutions manage to document studies at question and variable level, an appropriate solution is required to make the data findable (as in FAIR) at a fine granular level. DDI Search is a set of microservices and a standalone user interface, that provide responsive search and browse functionality and personalization such as creating question collections for re-use. In conjunction with the GESIS FlatDB, it is a strong, tested, open source and DDI compliant technology stack for Social Sciences research institutes to increase findability, accessibility, interoperability and re-usability at question and variable level. User tests with the CESSDA EQB community were the basis for the ui development. With an open-source licensing policy, institutions are safe from the risk of vendor lock-ins often unavoidable with commercial solutions like NESSTAR or Colectica. Repositories can choose smooth, step-by-step implementation paths, unlike with monolithic architectures such as DataVerse. We describe the technical components and data pipeline from institutional repositories to the search index, the functionalities of the search user interface and give directions for research institutes and data repositories how to employ the DDI Search for their purpose. A recorded version of this talk can be found here: https://youtu.be/cyL7m-y3KXs
A census of hyperbolic platonic manifolds and augmented knotted trivalent graphs
Creators: name: Goerner, Matthias
Publisher: name: arXiv
Year: 2016
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57N10 (Primary), 57M25 (Secondary)

description: We call a 3-manifold Platonic if it can be decomposed into isometric Platonic solids. Generalizing an earlier publication by the author and others where this was done in case of the hyperbolic ideal tetrahedron, we give a census of hyperbolic Platonic manifolds and all of their Platonic tessellations. For the octahedral case, we also identify which manifolds are complements of an augmented knotted trivalent graph and give the corresponding link. A (small version of) the Platonic census and the related improved algorithms have been incorporated into SnapPy. The census also comes in Regina format. In the appendix, we show that an ideal cubical tessellation can be subdivided into an ideal geometric triangulation.
description: 24 pages, 1 figure, 10 tables, 1 appendix. Version 2 added the appendix and contains minor revisions
Explaining the Puzzling Impact of Threat on the Evolution of Ethnocentrism
Creators: name: Pan, Xinyue
name: Nau, Dana
name: De, Soham
name: Hsiao, Vincent
name: Gelfand, Michele
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Social and Behavioral Sciences

description: Data and codes used for this project.
The geodesic flow of a generic metric does not admit nontrivial integrals polynomial in momenta
Creators: name: Kruglikov, Boris
name: Matveev, Vladimir S.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Any smooth geodesic flow is locally integrable with smooth integrals. We show that generically this fails if we require, in addition, that the integrals are polynomial (or, more generally, analytic) in momenta. Consequently we obtain that a generic real-analytic metric does not admit, even locally, a real-analytic integral.
description: are welcome
Suitability Map for Arabica Coffee
Creators: name: Bato, Victorino
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Agriculture
subject: Geographic Information Sciences
subject: Life Sciences
subject: Social and Behavioral Sciences
subject: Geography
subject: arabica
subject: coffee
subject: GIS
subject: philippines
subject: suitability

description: Vector files for the suitability map of arabica coffee. An output of SARAI Project Phase 1. University of the Philippines, Los Banos.
Diversity, public space and places of encounter:
Creators: name: Ahmadi, Donya
Publisher: name: A+BE | Architecture and the Built Environment
Year: 2018

description: Increasingly, public spaces are being regarded as important resources for fostering multi-cultural coexistence and for creating opportunities for cross-cultural understanding and dialogue, in that they can provide a platform wherein interactions across diverse backgrounds occur. This article explores the perceptions of public place in a highly diverse, post-war, modernist suburb of Toronto, and the extent to which public spaces play a role in fostering interactions between different groups and catering for diversity in the area. The analysis indicates that there is little evidence for encounters between diverse groups in public spaces, due to the lack of spatial infrastructure anticipated in the modernist design of the neighbourhood. In addition, social factors such as surveillance and policing, lack of appropriate symbols that cater to different user groups, and presence of gangs and violence have resulted in residents’ self-exclusion from public spaces and undermined the frequency and quality of their social encounters.
description: A+BE | Architecture and the Built Environment, No. 12 (2017): Living with diversity in Jane-Finch
Serving diverse communities
Creators: name: Ahmadi, Donya
Publisher: name: A+BE | Architecture and the Built Environment
Year: 2018

description: The recent decades have witnessed a shift from the traditional top-down model of service delivery led by the state to the provision and delivery of services by community organisations. This article explores the extent to which community initiatives in Jane and Finch, a highly diverse, lower income, inner-suburban neighbourhood of Toronto, were successful in achieving their goals, and the relevance of the experience for current neighbourhood initiatives targeting diversity. It discusses the factors which contributed to the effectiveness of 10 analysed initiatives in terms of reaching their primary objectives. The analysis shows that despite the efforts within community initiatives to improve conditions for inhabitants, their impacts remain limited due to underlying structural challenges such as poverty and institutionalised racism, increasing fragmentation within the over-all network of initiatives and precarious funding, which pit programs against one another and hamper effective collaboration and solidarity needed in order to achieve transformative change.
description: A+BE | Architecture and the Built Environment, No. 12 (2017): Living with diversity in Jane-Finch
Synthesis
Creators: name: Ahmadi, Donya
Publisher: name: A+BE | Architecture and the Built Environment
Year: 2018

description: The starting point of this project was the ‘paradox’ in how the concept of urban diversity is evoked, in theory, in policy and in practice, as something which is simultaneously celebrated and demonised. Diversity is indeed a fashion word, it sounds celebratory, tolerant and harmonious, but not too confrontational (Essed, 2002). Diversity has gained popular appeal especially because it offers an approach that goes beyond ‘dated’ terms such as equality and anti-racism. Yet diversity workers often tend to experience this very paradox, working within organizations that claim to be committed to diversity but feeling as though they are ‘banging their head against a brick wall’ (Sara Ahmed, 2012, emphasis mine). The same paradox is evident in the manner in which the city of Toronto approaches its diversity. The premise that diversity is a strength which should be celebrated appears to be a popular notion within Toronto’s city policy and mainstream public discourse. Yet, Toronto’s most diverse neighbourhoods located at the edges of the city are scapegoated and criminalised. This is especially the tendency when ethnic, cultural and religious diversity coincide with poverty, welfare dependency and poor infrastructure. This study set out to provide empirical knowledge of what living with and working towards diversity in urban areas looks like. Specifically, it raised the question: How is diversity experienced at the neighbourhood level, as (a) discourse, (b) social reality, and (c) practice?? This question was broken down to four sub-questions which were investigated in four interconnected chapters (chapters 3 to 6). The present concluding chapter provides a summary of the findings of each empirical chapter and further discusses these findings in relation to one another. It closes with recommendations for both policy and future scholarship addressing diversity in our cities.
description: A+BE | Architecture and the Built Environment, No. 12 (2017): Living with diversity in Jane-Finch
Cowpea Leaves: Feasible Solutions to Overcome Seasonal Availability
Creators: name: Owade, Joshua
name: Abong', George
name: Okoth, Michael
name: Mwangombe, Agnes
Publisher: name: Academia Kenya
Year: 2021
Subjects: Agriculture
Cowpea
Kenya

description: Cowpea leaves (Figure 1) is the most produced ALV in the country and has been promoted as a food security crop due to its rich micronutrient content (Owade et al., 2020). However, seasonal availability of the crop constrains its extensive utilization. Moreover, during the long and short rains in ASALs, the vegetables is in abundance but this is followed by scarcity in the off-season. The leafy vegetable has been promoted over the grains of the crop as a cheap alternative source of micronutrients (Mamiro et al., 2011). Value addition of fresh produce is deployed for product diversification and postharvest management of produce. Without postharvest management, Gogo et al. (2017), reports economic losses of 12.6–34.4%, further limiting vegetable availability for household utilization and commercialization. Policy gaps with regards to cowpea leaves in the country are evident due to limited policy focus of this value chain as there is limited documentation of the postharvest losses of any vegetable in the African Postharvest Losses Information System.
New Invariants of Knotoids
Creators: name: Gügümcü, Neslihan
name: Kauffman, Louis H.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: In this paper we construct new invariants of knotoids including the odd writhe, the parity bracket polynomial, the affine index polynomial and the arrow polynomial, and give an introduction to the theory of virtual knotoids. The invariants in this paper are defined for classical knotoids in analogy to corresponding invariants of virtual knots. The affine index polynomial and the arrow polynomial provide bounds on the height (minimum crossing distance between endpoints) of a classical knotoid. We show that classical knotoids have symmetric affine index polynomials.
Active-to-absorbing-state phase transition in an evolving population with mutation
Creators: name: Sarkar, Niladri
Publisher: name: arXiv
Year: 2015
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the active to absorbing phase transition (AAPT) in a simple two-component model system for a species and its mutant. We uncover the nontrivial critical scaling behavior and weak dynamic scaling near the AAPT that shows the significance of mutation and highlights the connection of this model with the well-known directed percolation universality class. Our model should be a useful starting point to study how mutation may affect extinction or survival of a species.
description: 12 pages, 1 fig
Conflict within Sudanese and South Sudanese Diasporas: Outlining the nature and impacts of conflict and assessing existing educational responses
Creators: name: Butcher, Jessica Catherine Jean
Publisher: name: University of North Carolina at Chapel Hill
Year: 2013

description: Conflict within the Greater Sudanese diaspora remains, and is exacerbated, in the resettlement process. Conflict derives from historical or current homeland issues such as identity or political cleavages. Conflict also emerges in the process of migration and acculturative stress. This has intergenerational and gender factors, and develops in reaction to the changing dynamics of a community `in exile'. Finally, conflict occurs as a result of interaction with the society of the resettlement country, including elevation of certain groups or individuals within the diaspora, be they ethnic, religious, gender or otherwise distinct. Formal education offers opportunities for conflict transformation in this resettlement context, through differing means and outcomes. Peace Education offers a deliberate, individualized approach to reframing conflict and peace. Vocational education offers structural inclusion through employment, a status demonstrated to decrease hostilities. Community Development Programming offers greater social inclusion, re-framing education for peace from an individual to a collective endeavor.
Ranking scientists
Creators: name: Dorogovtsev, S. N.
name: Mendes, J. F. F.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Digital Libraries (cs.DL)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Currently the ranking of scientists is based on the $h$-index, which is widely perceived as an imprecise and simplistic though still useful metric. We find that the $h$-index actually favours modestly performing researchers and propose a simple criterion for proper ranking.
description: 3 pages, 2 figures, the original version
From Documentation to Search for Questions for Small Service Provider in DDI
Creators: name: Klas, Claus-Peter
name: Hopt, Oliver
name: Krämer, Thomas
name: Nugraha, Sigit
Publisher: name: Zenodo
Year: 2021

description: Many smaller service providers and institutions in the social sciences document survey data only on the level of studies. The reasons are multifold, but one prominent reason is missing software or tool support to document questions and variables. In addition, such tools are usually self-developed and lack functionality and do not provide DDI as metadata standard. Current tools to document studies and questions are DataVerse, NESSTAR and the commercial tool suite Colectica. In conjunction with the GESIS FlatDB, it is a strong, tested, open-source and DDI compliant technology stack for Social Sciences research institutes to increase findability, accessibility, interoperability and re-usability at question and variable level we will provide updates about the GESIS questionnaire editor as open-source service for documentation and translation. The documented information can directly be published and used for searching e.g., in the GESIS DDI search tool (see presentation: DDI Search: The missing link between researcher and repository). Recorded version of this talk: https://youtu.be/cf-XW9bW66k
A supernova distance to the anchor galaxy NGC 4258
Creators: name: Polshaw, J.
name: Kotak, R.
name: Chambers, K. C.
name: Smartt, S. J.
name: Taubenberger, S.
name: Kromer, M.
name: Gall, E. E. E.
name: Hillebrandt, W.
name: Huber, M.
name: Smith, K. W.
name: Wainscoat, R. J.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The fortuitous occurrence of a type II-Plateau (IIP) supernova, SN 2014bc, in a galaxy for which distance estimates from a number of primary distance indicators are available provides a means with which to cross-calibrate the standardised candle method (SCM) for type IIP SNe. By applying calibrations from the literature we find distance estimates in line with the most precise measurement to NGC 4258 based on the Keplerian motion of masers (7.6$\pm$0.23\,Mpc), albeit with significant scatter. We provide an alternative local SCM calibration by only considering type IIP SNe that have occurred in galaxies for which a Cepheid distance estimate is available. We find a considerable reduction in scatter ($σ_I = 0.16$\, mag.), but note that the current sample size is limited. Applying this calibration, we estimate a distance to NGC 4258 of $7.08\pm0.86$ Mpc.
description: 7 pages, 4 figures, 4 tables, published in A&A Letters. Corrected for missing reference in caption of Fig. 2