cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Hybrid MMSE Beamforming for Multiuser Millimeter Wave Communication Systems
Creators: name: Cong, Jiaqi
name: Lin, Tian
name: Zhu, Yu
Publisher: name: arXiv
Year: 2019
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This letter investigates the hybrid analog and digital beamforming (HBF) design for multiuser millimeter wave (mmWave) communication systems based on the minimum mean square error (MMSE) criterion. Using the alternating minimization method, the hybrid precoder of the base station (BS) and the hybrid combiners of the users are alternatively optimized. It is shown that both the optimized digital precoder of the BS and the digital combiners of the users have closed-form expressions, and their corresponding analog ones can be efficiently obtained via generalized eigen-decomposition. Simulation results show that the proposed MMSE HBF scheme has fast convergence and performs close to the fully digital beamforming.
The Symbolic, the Lithic and the Legible: Simon-Claude Constant-Dufeux and Mid-Nineteenth-Century Architectural Eclecticism
Creators: Ghoche, Ralph
Publisher: name: Columbia University
Year: 2015
Subjects: subject: Architecture
subject: FOS: Civil engineering
subject: Architecture, French
subject: Eclecticism in architecture
subject: Art

description: This dissertation traces the career of Simon-Claude Constant-Dufeux (1801-1871), an important, yet little-studied, architect and educator who played a central role in mid-nineteenth-century architectural culture and pedagogy in France. In his writings, his designs, and his teachings at the École des Beaux-Arts and in the private atelier established in 1836, Constant-Dufeux presented architecture as a discipline primarily concerned with symbolic expression and communication. Constant-Dufeux played a key role in determining what would later be called, the Néo-Grec façade. Moreover, his influential teachings on the unity of the arts, his attention to the burgeoning field of aesthetics, and his interest in ornamental design, left a lasting imprint on the subsequent generation of architects and decorative artists. The dissertation is organized in two parts. Structured as an intellectual history, the first part charts the discourse on symbolic representation as developed by philologists, philosophers, archeologists and architects in the late eighteenth and early nineteenth century. Here, I explore two parallel developments that were consequential in the way the symbol was understood by Constant-Dufeux: the migration of German Romantic theories of the symbol into France, and the emergence of a "symbolic interpretation" of origins in the architectural discourse of the late eighteen and early nineteenth centuries that challenged neoclassical accounts based on imitation. The second part traces the social, political and aesthetic philosophy of Constant-Dufeux from his early formation in the administration of the Ponts et Chaussée and in the atelier of François Debret at the École des Beaux-Arts, through his decisive experience in Italy as a recipient of the Grand Prix in 1829, to his professional career in Paris. I provide close readings of the architect's chief works: the fifth-year envoi from Rome for a Chamber of Deputies, the façade for the École Gratuite de Dessin de Paris on the rue Racine, the design of a medal for the Société Centrale des Architectes, and his most ambitious and multi- layered work: the tomb for the rear-admiral Dumont d'Urville in the Montparnasse Cemetery. In addition, I assess more fully the architect's larger vision and theory in light of the reigning eclecticism of the epoch. The architect's eclecticism is read through the lens of Ludovic Vitet, César Daly and Victor Cousin, and I demonstrate that far from being a undirected mélange of competing historical styles, it was intended as a purposeful, even utopian strategy of provoking a yet unseen modern architectural form.
Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) - II. A broadened sodium feature on the ultra-hot giant WASP-76b
Creators: name: Seidel, J. V.
name: Ehrenreich, D.
name: Wyttenbach, A.
name: Allart, R.
name: Lendl, M.
name: Pino, L.
name: Bourrier, V.
name: Cegla, H. M.
name: Lovis, C.
name: Barrado, D.
name: Bayliss, D.
name: Astudillo-Defru, N.
name: Deline, A.
name: Fisher, C.
name: Heng, K.
name: Joseph, R.
name: Lavie, B.
name: Melo, C.
name: Pepe, F.
name: Ségrasan, D.
name: Udry, S.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: High-resolution optical spectroscopy is a powerful tool to characterise exoplanetary atmospheres from the ground. The sodium D lines, with their large cross sections, are especially suited to study the upper layers of atmospheres in this context. We report on the results from HEARTS, a spectroscopic survey of exoplanet atmospheres, performing a comparative study of hot gas giants to determine the effects of stellar irradiation. In this second installation of the series, we highlight the detection of neutral sodium on the ultra-hot giant WASP-76b. We observed three transits of the planet using the HARPS high-resolution spectrograph at the ESO 3.6m telescope and collected 175 spectra of WASP-76. We repeatedly detect the absorption signature of neutral sodium in the planet atmosphere ($0.371\pm0.034\%$; $10.75 σ$ in a $0.75$ Å passband). The sodium lines have a Gaussian profile with full width at half maximum (FWHM) of $27.6\pm2.8$ km s$^{-1}$. This is significantly broader than the line spread function of HARPS ($2.7$ km s$^{-1}$). We surmise that the observed broadening could trace the super-rotation in the upper atmosphere of this ultra-hot gas giant.
description: 11 pages, 9 figures; accepted by Astronomy and Astrophysics (29.01.2019)
Additional file 3 of Characterization of resistance mechanisms of Enterobacter cloacae Complex co-resistant to carbapenem and colistin
Creators: name: Liu, Shixing
name: Fang, Renchi
name: Zhang, Ying
name: Chen, Lijiang
name: Huang, Na
name: Yu, Kaihang
name: Zhou, Cui
name: Cao, Jianming
name: Zhou, Tieli
Publisher: name: figshare
Year: 2021
Subjects: subject: Biophysics
subject: Microbiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Ecology
subject: Cancer
subject: Hematology
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology
subject: Virology

description: Additional file 3: Table S3. The results of efflux inhibitors assay
On vacuum-vacuum amplitude and Bogoliubov coefficients
Creators: name: Nikishov, A. I.
Publisher: name: arXiv
Year: 2002
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Even if the electromagnetic field does not create pairs, virtual pairs lead to the appearance of a phase in vacuum-vacuum amplitude. This makes it necessary to distinguish the in- and out-solutions even when it is commonly assumed that there is only one complete set of solutions as, for example, in the case of a constant magnetic field. Then in- and out-solutions differ only by a phase factor which is in essence the Bogoliubov coefficient. The propagator in terms of in- and out-states takes the same form as the one for pair creating fields. The transition amplitude for an electron to go from an initial in-state to out-state is equal to unity (in diagonal representation). This is in agreement with Pauli principal: if in the field there is an electron with given (conserved) set of quantum numbers, virtual pair cannot appear in this state. So even the phase of transition amplitude remains unaffected by the field. We show how one may redefine the phases of Bogoliubov coefficients in order to express the vacuum-vacuum amplitude through them.
description: 20pages, no figures, some typos corrected, minor improvements
Thermostatting by deterministic scattering
Creators: name: Klages, R.
name: Rateitschak, K.
name: Nicolis, G.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We present a mechanism for thermalizing a moving particle by microscopic deterministic scattering. As an example, we consider the periodic Lorentz gas. We modify the collision rules by including energy transfer between particle and scatterer such that the scatterer mimics a thermal reservoir with arbitrarily many degrees of freedom. The complete system is deterministic, time-reversible, and provides a microcanonical density in equilibrium. In the limit of the disk representing infinitely many degrees of freedom and by applying an electric field the system goes into a nonequilibrium steady state.
description: 4 pages (revtex) with 4 figures (postscript)
Causality implies formal state collapse
Creators: name: Svetlichny, George
Publisher: name: arXiv
Year: 2002
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A physical theory of experiments carried out in a space-time region can accommodate a detector localized in another space-like separated region, in three, not necessarily exclusive, ways: 1) the detector formally collapses physical states across space-like separations, 2) the detector enables superluminal signals, and 3) the theory becomes logically inconsistent. If such a theory admits autonomous evolving states, the space-like collapse must be instantaneous. Time-like separation does not allow such conclusions. We also prove some simple results on structural stability: within the set of all possible theories, under a weak empirical topology, the set of all theories with superluminal signals and the set of all theories with retrograde signals are both open and dense.
description: As accepted by Foundations of Physics. No essentially new results. Some more discussion, and a new reference. LaTeX, 17 pages
Additional file 3: of Implementation facilitation to promote emergency department-initiated buprenorphine for opioid use disorder: protocol for a hybrid type III effectiveness-implementation study (Project ED HEALTH)
Creators: name: DâOnofrio, Gail
name: E. Edelman
name: Hawk, Kathryn
name: Pantalon, Michael
name: Chawarski, Marek
name: Owens, Patricia
name: Martel, Shara
name: VanVeldhuisen, Paul
name: Oden, Neal
name: Murphy, Sean
name: Huntley, Kristen
name: OâConnor, Patrick
name: Fiellin, David
Publisher: name: figshare
Year: 2019
Subjects: subject: Molecular Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: 69999 Biological Sciences not elsewhere classified
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: 110309 Infectious Diseases
subject: 60506 Virology
subject: Computational Biology

description: Example of Organizational Readiness to Change Assessment (ORCA) for ED providers Baseline and IF/Post IF and Readiness and Preparedness Rulers Baseline and Follow up. (DOCX 71 kb)
The Systems Thinking Learning Lens: An Exploratory Study of Executives' Mental Models
Creators: Sutherland, Debbie
Publisher: name: Columbia University
Year: 2019
Subjects: subject: Educational leadership
subject: Organizational behavior
subject: Psychology
subject: FOS: Psychology
subject: Executives

description: It has become progressively difficult for businesses to tackle unanticipated events and define the influencers that generate unintended business consequences. As such, uncertain and ambiguous situations are now the prescriptive norm for many companies. Executives are at the forefront of having to make sense of the uncertainty to seek the ideal decision pathway. The purpose of this exploratory research study was to seek what is known about learning how to develop a systems thinking mental model by exploring the perceptions and narratives of 12 global executives working in the United Arab Emirates (UAE) within complex adaptive systems (CAS) and their understanding of their thinking patterns that may have assisted in learning how to develop a systems thinking mental model to manage business ambiguity. Three research questions were developed to identify the types of experiences, perceptions, thinking patterns, and enablers—be they within the individual, organizational, or environmental context—that may have provided a strategic learning path. The research questions include: (a) What characterizes the mental models the executives hold (the distinct nature or features of their beliefs, behaviors, and principles)?; (b) What are the experiences that provide the scaffolding in developing a systems thinking mental model (experiences and events)?; and (c) What aspects of the individual, organizational, and environmental interactions enable individuals to learn how to develop a systems thinking capacity (relationships, systems, and elements)? The qualitative exploratory research study used three data collection methods: (a) semi-structured interviews, (b) focus group session, and (c) demographic questionnaire. The researcher concluded from the findings, analysis, interpretations, and synthesis that: (a) a systems thinking mental model is reflective of and responsive to different elements, situations, and influencers; (b) certain behaviors are an integral part of a systems thinking mental model; (c) informal learning experiences in ambiguous and uncertain situations may provide an ambiguous thinking learning pathway; and (d) learning through social, cultural, and operational systems is an under-utilized strategic intent.
RG Equations and High Energy Behaviour in Non-Renormalizable Theories
Creators: name: Kazakov, D. I.
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We suggest a novel view on non-renormalizable interactions. It is based on the usual BPHZ R-operation which is equally applicable to any local QFT independently whether it is renormalizable or not. As a playground we take the phi^4_D theory in D dimensions for D=4,6,8,10 and consider the four-point scattering amplitude on shell. We derive the generalized RG equation and find the solution valid for any D that sums up the leading logarithms in all orders of PT in full analogy with the renormalizable case. It is found that the scattering amplitude in the phi^4_D theory possesses the Landau pole at high energy for any D. We discuss the application of the proposed procedure to other non-renormalizable theories.
description: 9 pages, 2 figures, pdflatex
Additional file 2: of “If we miss this chance, it’s futile later on” – late antenatal booking and its determinants in Bhutan: a mixed-methods study
Creators: name: Thinley Dorji
name: Mrinalini Das
name: Bergh, Rafael Van Den
name: Myo Oo
name: Sonam Gyamtsho
name: Tenzin, Karma
name: Tashi Tshomo
name: Sonam Ugen
Publisher: name: figshare
Year: 2019
Subjects: subject: Pharmacology
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Developmental Biology

description: Interview guide for in-depth interviews on the themes around late antenatal booking (DOCX 15 kb)
Ideal gas sources for the Lemaitre-Tolman-Bondi metrics
Creators: name: Sussman, Roberto A.
Publisher: name: arXiv
Year: 1997
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: New exact solutions emerge by replacing the dust source of the Lemâitre-Tolman-Bondi metrics with a viscous fluid satisfying the monatomic gas equation of state. The solutions have a consistent thermodynamical interpretation. The most general transport equation of Extended Irreversible Thermodynamics is satisfied, with phenomenological coefficients bearing a close resemblance to those characterizing a non relativistic Maxwell-Bolzmann gas.
description: 7 pages, Plain TeX with IOP macros, important corrections to previous version, 3 figures (to appear in Classical and Quantum Gravity, June 1998)
One-loop renormalization of general noncommutative Yang-Mills field model coupled to scalar and spinor fields
Creators: name: Buchbinder, I. L.
name: Krykhtin, V. A.
Publisher: name: arXiv
Year: 2002
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the theory of noncommutative U(N) Yang-Mills field interacting with scalar and spinor fields in the fundamental and the adjoint representations. We include in the action both the terms describing interaction between the gauge and the matter fields and the terms which describe interaction among the matter fields only. Some of these interaction terms have not been considered previously in the context of noncommutative field theory. We find all counterterms for the theory to be finite in the one-loop approximation. It is shown that these counterterms allow to absorb all the divergencies by renormalization of the fields and the coupling constants, so the theory turns out to be multiplicatively renormalizable. In case of 1PI gauge field functions the result may easily be generalized on an arbitrary number of the matter fields. To generalize the results for the other 1PI functions it is necessary for the matter coupling constants to be adapted in the proper way. In some simple cases this generalization for a part of these 1PI functions is considered.
description: 1+26 pages, figures using axodraw, clarifications added
Additional file 1: of “If we miss this chance, it’s futile later on” – late antenatal booking and its determinants in Bhutan: a mixed-methods study
Creators: name: Thinley Dorji
name: Mrinalini Das
name: Bergh, Rafael Van Den
name: Myo Oo
name: Sonam Gyamtsho
name: Tenzin, Karma
name: Tashi Tshomo
name: Sonam Ugen
Publisher: name: figshare
Year: 2019
Subjects: subject: Biochemistry
subject: Pharmacology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Developmental Biology

description: Data extraction pro forma ANC booking study Bhutan. (DOCX 23 kb)
Symmetry, singularities and integrability in complex dynamics I: the reduction problem
Creators: name: Leach, Peter
name: Cotsakis, Spiros
name: Flessas, George P.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Quadratic systems generated using Yang-Baxter equations are integrable in a sense, but we display a deterioration in the possession of the Painlevé property as the number of equations in each `integrable system' increases. Certain intermediate systems are constructed and also tested for the Painlevé property. The Lie symmetries are also computed for completeness.
The population-attributable fraction for time-dependent exposures and competing risks - A discussion on estimands
Creators: name: von Cube, Maja
name: Schumacher, Martin
name: Bailly, Sebastien
name: Timsit, Jean-Francois
name: Lepape, Alain
name: Savey, Anne
name: Machut, Anais
name: Wolkewitz, Martin
Publisher: name: arXiv
Year: 2019
Subjects: subject: Applications (stat.AP)
subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: The population-attributable fraction (PAF) quantifies the public health impact of a harmful exposure. Despite being a measure of significant importance an estimand accommodating complicated time-to-event data is not clearly defined. We discuss current estimands of the PAF used to quantify the public health impact of an internal time-dependent exposure for data subject to competing outcomes. To overcome some limitations, we proposed a novel estimand which is based on dynamic prediction by landmarking. In a profound simulation study, we discuss interpretation and performance of the various estimands and their estimators. The methods are applied to a large French database to estimate the health impact of ventilator-associated pneumonia for patients in intensive care.
description: A revision has been submitted
Multiresolution time-of-arrival estimation from multiband radio channel measurements
Creators: name: Kazaz, Tarik
name: Rajan, Raj Thilak
name: Janssen, Gerard J. M.
name: van der Veen, Alle-Jan
Publisher: name: arXiv
Year: 2019
Subjects: subject: Signal Processing (eess.SP)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Achieving high resolution time-of-arrival (TOA) estimation in multipath propagation scenarios from bandlimited observations of communication signals is challenging because the multipath channel impulse response (CIR) is not bandlimited. Modeling the CIR as a sparse sequence of Diracs, TOA estimation becomes a problem of parametric spectral inference from observed bandlimited signals. To increase resolution without arriving at unrealistic sampling rates, we consider multiband sampling approach, and propose a practical multibranch receiver for the acquisition. The resulting data model exhibits multiple shift invariance structures, and we propose a corresponding multiresolution TOA estimation algorithm based on the ESPRIT algorithm. The performance of the algorithm is compared against the derived Cramér Rao Lower Bound, using simulations with standardized ultra-wideband (UWB) channel models. We show that the proposed approach provides high-resolution estimates while reducing spectral occupancy and sampling costs compared to traditional UWB approaches.
description: 5 pages, 5 figures, conference
A Closed Contour of Integration in Regge Calculus
Creators: name: Birmingham, Danny
Publisher: name: arXiv
Year: 1997
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The analytic structure of the Regge action on a cone in $d$ dimensions over a boundary of arbitrary topology is determined in simplicial minisuperspace. The minisuperspace is defined by the assignment of a single internal edge length to all 1-simplices emanating from the cone vertex, and a single boundary edge length to all 1-simplices lying on the boundary. The Regge action is analyzed in the space of complex edge lengths, and it is shown that there are three finite branch points in this complex plane. A closed contour of integration encircling the branch points is shown to yield a convergent real wave function. This closed contour can be deformed to a steepest descent contour for all sizes of the bounding universe. In general, the contour yields an oscillating wave function for universes of size greater than a critical value which depends on the topology of the bounding universe. For values less than the critical value the wave function exhibits exponential behaviour. It is shown that the critical value is positive for spherical topology in arbitrary dimensions. In three dimensions we compute the critical value for a boundary universe of arbitrary genus, while in four and five dimensions we study examples of product manifolds and connected sums.
description: 16 pages, Latex, To appear in Gen. Rel. Grav
Additional file 1 of Associations between CD160 polymorphisms and autoimmune thyroid disease: a case-control study
Creators: name: He, Weiwei
name: Zhao, Jing
name: Liu, Xuerong
name: Li, Sheli
name: Mu, Kaida
name: Zhang, Jing
name: Zhang, Jin-an
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Physiology
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Sociology
subject: FOS: Sociology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer

description: Additional file 1: Supplementary Table 1. Allele frequencies and genotype distribution of CD160 polymorphisms between GD patients and controls in the subgroup analysis by ophthalmopathy. Supplementary Table 2. Allele frequencies and genotype distribution of CD160 polymorphisms between AITD patients and controls in females. Supplementary Table 3. Allele frequencies and genotype distribution of CD160 polymorphisms between AITD patients and controls in males. Supplementary Table 4. Allele frequencies and genotype distribution of CD160 polymorphisms between AITD patients and controls stratified by family history. Supplementary Table 5. Allele frequencies and genotype distribution of CD160 polymorphisms between GD patients and controls stratified by family history. Supplementary Table 6. Allele frequencies and genotype distribution of CD160 polymorphisms between HT patients and controls stratified by family history. Supplementary Table 7. Allele frequencies and genotype distribution of CD160 polymorphisms between AITD patients and controls stratified by goiter.
Spatial dispersion of the high-frequency conductivity of two-dimensional electron gas subjected to a high electric field: collisionless case
Creators: name: Korotyeyev, V. V.
name: Kochelap, V. A.
name: Danylyuk, S.
name: Varani, L.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Applied Physics (physics.app-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We present the analysis of high-frequency (dynamic) conductivity with the spatial dispersion, $σ(ω, {\bf q})$, of two-dimensional electron gas subjected to a high electric field. We found that at finite wavevector, ${\bf q}$, and at high fields, the high-frequency conductivity shows following peculiarities: strong non-reciprocal dispersion; oscillatory behavior; a set of frequency regions with negative $σ'$; non-exponential decay of $σ'$ and $σ''$ with frequency (opposite to the Landau damping mechanism). We illustrate the general results by calculations of spectral characteristics of particular plasmonic heterostructures on the basis of III-V semiconductor compounds. We conclude that the detailed analysis of the spatial dispersion of the dynamic conductivity of 2DEG subjected to high electric fields is critically important for different THz applications.
The Teacher as Mathematician: Problem Solving for Today's Social Context
Creators: Brewster, Holly
Publisher: name: Columbia University
Year: 2014
Subjects: Education--Philosophy
Mathematics--Study and teaching

description: A current trend in social justice oriented education research is the promotion of certain intellectual virtues that support epistemic responsibility, or differently put, the dispositions necessary to be a good knower.  On the surface, the proposition of epistemically responsible teaching, or teaching students to be responsible knowers is innocuous, even banal.  In the mathematics classroom, however, it is patently at odds with current practice and with the stated goals of mathematics education.
      This dissertation begins by detailing the extant paradigm in mathematics education, which characterizes mathematics as a body of skills to be mastered, and which rewards ways of thinking that are highly procedural and mechanistic.  It then argues, relying on a wide range of educational thinkers including John Dewey, Maxine Greene, Miranda Fricker, and a collection of scholars of white privilege, that an important element in social justice education is the eradication of such process-oriented thinking, and the promotion of such intellectual virtues as courage and humility.  Because the dominant paradigm is supported by an ideology and mythology of mathematics, however, changing that paradigm necessitates engaging with the underlying conceptions of mathematics that support it.  The dissertation turns to naturalist philosophers of education make clear that the nature of mathematics practice and the growth of mathematical knowledge are not characterized by mechanistic and procedural thinking at all.  In these accounts, we can see that good mathematical thinking relies on many of the same habits and dispositions that the social justice educators recommend.
       	In articulating an isomorphism between good mathematical thinking and socially responsive thinking, the dissertation aims to offer a framework for thinking about mathematics education in and for a democratic society.  It aims to cast the goals of mathematically rigorous education and socially responsible teaching not only as not in conflict, but also overlapping in meaningful ways.
Mathematics of nerve signals
Creators: name: Engelbrecht, Jüri
name: Tamm, Kert
name: Peets, Tanel
Publisher: name: arXiv
Year: 2019
Subjects: subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Mathematical models describing the signals propagating in nerve fibres are described. The emphasis is on the mathematical structures of governing equations while the extremely rich physiological aspects are here not analysed. Based on models of single waves, a joint coupled model is presented which is able to describe the action potential and the accompanying mechanical effects togehter with temperature changes within one system of partial differential equations. The whole signal is an ensemble which includes primary and secondary components. The primary components of a signal are the action potential itself and longitudinal mechanical waves in axoplasm and surrounding biomembrane. These components are characterized by corresponding velocities. The secondary components of a signal are derived from primary components and include transverse displacement of a biomembrane and the temperature change. These secondary components have no independent velocities in the presented model.
description: arXiv admin note: text overlap with arXiv:1802.07014
Dynamics of lattice spins as a model of arrhythmia
Creators: name: Khlebnikov, S.
Publisher: name: arXiv
Year: 1999
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We consider evolution of initial disturbances in spatially extended systems with autonomous rhythmic activity, such as the heart. We consider the case when the activity is stable with respect to very smooth (changing little across the medium) disturbances and construct lattice models for description of not-so-smooth disturbances, in particular, topological defects; these models are modifications of the diffusive XY model. We find that when the activity on each lattice site is very rigid in maintaining its form, the topological defects - vortices or spirals - nucleate a transition to a disordered, turbulent state.
description: 17 pages, revtex, 3 figures
Enhanced Energy-Efficient Downlink Resource Allocation in Green Non-Orthogonal Multiple Access Systems
Creators: name: Ruby, Rukhsana
name: Zhong, Shuxin
name: Ng, Derrick Wing Kwan
name: Wu, Kaishun
name: Leung, Victor C. M.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Despite numerous advantages, non-orthogonal multiple access (NOMA) technique can bring additional interference for the neighboring ultra-dense networks if the power consumption of the system is not properly optimized. While targeting on the green communication concept, in this paper, we propose an energy-efficient downlink resource allocation scheme for a NOMA-equipped cellular network. The objective of this work is to allocate subchannels and power of the base station among the users so that the overall energy efficiency is maximized. Since this problem is NP-hard, we attempt to find an elegant solution with reasonable complexity that provides good performance for some realistic applications. To this end, we decompose the problem into a subchannel allocation subproblem followed by a power loading subproblem that allocates power to each user's data stream on each of its allocated subchannels. We first employ a many-to-many matching model under the assumption of uniform power loading in order to obtain the solution of the first subproblem with reasonable performance. Once the the subchannel-user mapping information is known from the first solution, we propose a geometric programming (GP)-based power loading scheme upon approximating the energy efficiency of the system by a ratio of two posynomials. The techniques adopted for these subproblems better exploit the available multi-user diversity compared to the techniques used in an earlier work. Having observed the computational overhead of the GP-based power loading scheme, we also propose a suboptimal computationally-efficient algorithm for the power loading subproblem with a polynomial time complexity that provides reasonably good performance. Extensive simulation has been conducted to verify that our proposed solution schemes always outperform the existing work while consuming much less power at the base station.
description: 29 pages (Accepted)
The Teacher/Student Mismatch as a Site for Diffracting Subjectivity
Creators: Newbery, Mary Joyce
Publisher: name: Columbia University
Year: 2018
Subjects: Women's studies
Educational equalization
Public schools
Teacher-student relationships

description: Currently, in the United States, there is an urgency to address the perceived failure of contemporary public schools to educate diverse populations. This sense of failure is propped up by performance discrepancies between White, middle-class youth and low-income, including most often, youth of color. This disparity, frequently referred to as "the achievement gap," drives mandatory school improvement policies and practices designed to improve outcomes for underperforming, sub-categorically, school populations. Amid these interrelated policies and practices, all of which are dependent upon assumptions requiring predictability, generalizability, and stability as characteristics of sub-populations and their constituent subjects, the racial divide and the economic gap have been re-coded in terms of differences in exam scores (Taubman, 2009, p. 154).
      One significant implication of populational reasoning as recently deployed in contemporary U.S. public schools is that teachers-frequently White, middle-class women-are increasingly attributed with a categorical bias that "has increasingly served as a possible explanation [emphasis added] for the 'achievement gap,'" rather than as a contributing factor embedded in "demographic factors … far more complex than [previously] indicated" in education research (Farkas 2004, as cited in Takei & Shouse, 2007, p. 368; Ferguson, 1998; Perry, 2003). In this way, the frequent failures and non-proficiencies of both teachers and students, key components of crisis discourses, are often attributed to simplistically applied and unexamined "racial asymmetry" (p. 368) and undesirably framed within a "cultural and demographic mismatch" (Grant & Gibson, 2011, p. 25).
      In order to trouble commonsensical conceptualizations of this mismatch, this conceptual study works toward re-theorizing the mismatch as both a concept and as a subject-glomming "hub" in schools and society in ways that articulate difference differently. By diffracting feminist, new materialist and poststructural theories of subjectivity through the material discursive fields surrounding a contemporary work of art and a post-industrial city, notions of diffraction, as both a methodological tool and as a concept, are developed. Experimenting with the notion of concept as method, "mismatched" subjects are re-presented as non-individuated subjectivities that emerge within ever-changing material/discursive fields.
The Teaching and Learning of Geometric Proof: Roles of the Textbook and the Teacher
Creators: Markinson, Mara P.
Publisher: name: Columbia University
Year: 2021
Subjects: Mathematics--Study and teaching
Teachers--Training of
Curriculum planning
Curriculum evaluation

description: Geometric proof-writing is a widely known cause of stress for secondary school students and teachers alike. As the textbook is the primary curricular tool utilized by novice teachers, a two-part qualitative study was conducted to determine (a) the types of proofs presented in a typical high school geometry textbook and (b) teachers’ preparedness and confidence to teach proof and proving. I conducted a qualitative analysis of the selected textbook based on its presentation of proofs and proof tasks, and then used said analysis to inform the creation of a five-question content assessment on proof, which was administered to 29 preservice and in-service secondary mathematics teacher participants. During the administration of the assessment, I interviewed each participant regarding their thought processes, as well as their knowledge, beliefs, and preparedness to teach proof and proving. The data were analyzed using a qualitative coding system to categorize participants’ responses to the interview questions according to their beliefs and attitudes, as well as issues with mathematical language and content that they encountered. The qualitative analyses indicated that the selected textbook largely underemphasizes the role of proof in the secondary school geometry curriculum, and that most participants are largely underprepared to teach proof at the secondary level. Participants expressed sentiments about the nature of proof and proving, verifying trends from the literature and providing the impetus for future study. The findings support that more studies are needed to analyze the intersection between curricular knowledge and content knowledge for secondary mathematics teachers.
The dynamics of a low-order coupled ocean-atmosphere model
Creators: name: van Veen, L.
name: Verhulst, F.
name: Opsteegh, T.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: A system of five ordinary differential equations is studied which combines the Lorenz-84 model for the atmosphere and a box model for the ocean. The behaviour of this system is studied as a function of the coupling parameters. For most parameter values, the dynamics of the atmosphere model is dominant. For a range of parameter values, competing attractors exist. The Kaplan-Yorke dimension and the correlation dimension of the chaotic attractor are numerically calculated and compared to the values found in the uncoupled Lorenz model. In the transition from periodic behaviour to chaos intermittency is observed. The intermittent behaviour occurs near a Neimark-Sacker bifurcation at which a periodic solution loses its stability. The length of the periodic intervals is governed by the time scale of the ocean component. Thus, in this regime the ocean model has a considerable influence on the dynamics of the coupled system.
description: 20 pages, 15 figures, uses AmsTex, Amssymb and epsfig package. Submitted to the Journal of Nonlinear Science
The Teaching of Science to Refugees in Greece: a Multi-site Case Study of Volunteer Educators in Non-formal Education Settings
Creators: Gillette, Erika Schaffluetzel
Publisher: name: Columbia University
Year: 2020
Subjects: Science--Study and teaching
Multicultural education
Teachers--Training of
Refugees
Refugees--Study and teaching
Volunteer workers in education

description: This qualitative multi-site case study examines the experiences of four volunteers serving as educators and their use of science kits in three separate non-formal refugee spaces located in Greece. They received professional development and materials to support their teaching of science. An adapted Teacher-Centered Systematic Reform (TCSR) framework was used to analyze the relationship between personal factors, teacher thinking, practice, and contextual factors. Data sources for this study were pre- and post-activity questionnaires, pre- and post-activity journaling, observations, and structured interviews. Each of the data sources was analyzed to develop an understanding of the volunteer educators’ personal factors, teacher thinking, teacher practice, and contextual factors to identify emerging themes. Emerging themes provided evidence to better interpret the experiences and perceptions of volunteer educators who used science-kits in non-formal refugee educational settings. These themes were then compared between and across each case to find similarities and differences between volunteer educators. This research contributes to both the field of science education and the preparation of volunteers in emergency education to teach science.
The Teleological Theory of Representation
Creators: Campitelli, Stephen Anthony
Publisher: name: Columbia University
Year: 2011
Subjects: subject: Philosophy
subject: FOS: Philosophy, ethics and religion
subject: Cognitive psychology

description: This dissertation argues for a teleological theory of representations on the grounds that it provides a better account of explanation in psychology and cognitive science than its main competitor, non-teleological functionalism. Grounds for evaluating competing models of explanation are presented and several recent accounts of psychological explanation are analyzed and evaluated. An inclusive model, which incorporates both teleological and non-teleological features, is developed.
Additional file 2: of Implementation facilitation to promote emergency department-initiated buprenorphine for opioid use disorder: protocol for a hybrid type III effectiveness-implementation study (Project ED HEALTH)
Creators: name: DâOnofrio, Gail
name: E. Edelman
name: Hawk, Kathryn
name: Pantalon, Michael
name: Chawarski, Marek
name: Owens, Patricia
name: Martel, Shara
name: VanVeldhuisen, Paul
name: Oden, Neal
name: Murphy, Sean
name: Huntley, Kristen
name: OâConnor, Patrick
name: Fiellin, David
Publisher: name: figshare
Year: 2019
Subjects: subject: Molecular Biology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Cancer
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Focus group scripted narratives (DOCX 16 kb)
Symmetry, singularities and integrability in complex dynamics III: approximate symmetries and invariants
Creators: name: Leach, Peter
name: Moyo, Sibusio
name: Cotsakis, Spiros
name: Lemmer, R. L.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The different natures of approximate symmetries and their corresponding first integrals/invariants are delineated in the contexts of both Lie symmetries of ordinary differential equations and Noether symmetries of the Action Integral. Particular note is taken of the effect of taking higher orders of the perturbation parameter. Approximate symmetries of approximate first integrals/invariants and the problems of calculating them using the Lie method are considered.
A rotation group whose subspace arrangement is not from a real reflection group
Creators: name: Blum-Smith, Ben
Publisher: name: arXiv
Year: 2019
Subjects: subject: Combinatorics (math.CO)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 14N20, 20F55, 51F15

description: We exhibit a family of real rotation groups whose subspace arrangements are not contained in that of any real reflection group, answering a question of Martino and Singh.
description: 6 pages, no figures
The Temperament - Psychopathology Link: How Does Difficult Temperament Predict Risk for and Presentation of Major Depression Among Offspring at High and Low Risk for Depression
Creators: Sherman, Brian
Publisher: name: Columbia University
Year: 2012
Subjects: Clinical psychology

description: The current study examined the relationships between parental depression, offspring depression, and offspring temperament among 203 offspring at high or low-risk for depression. Offspring were followed over a 20-year study period. Two primary study aims were addressed. First, we sought to confirm that parental depression predicts offspring lifetime depression and offspring difficult temperament, and that offspring difficult temperament predicts offspring major depression, while adjusting for family effect. Second, we sought to examine the pathoplasty model of the relationship between temperament and psychopathology by examining how offspring difficult temperament affects qualitative features of major depression - specifically, frequency, severity, and duration. Results indicate that high-risk offspring have more difficult temperament and are four times more likely to have lifetime major depressive disorder (MDD) than low-risk offspring. In addition, offspring with a difficult temperament are twice as likely to have lifetime MDD than low-risk offspring. Results from aim 2 revealed that difficult temperament predicts greater frequency of lifetime MDEs, but not severity or duration. Finally, individual dimensions of temperament were uniquely associated with frequency, severity, and duration of major depressive episodes differentially across risk groups. Implications and future research directions are discussed.
The Terms of Our Connection: Affiliation and Difference in the Post-1960 North American Novel
Creators: James, Jennifer M.
Publisher: name: Columbia University
Year: 2012
Subjects: American literature
Gender identity
Sex role
Gay and lesbian studies
Sexual minorities

description: This dissertation considers a neglected legacy of the long 1960s (1959-1975): the struggle to form lasting connections across seemingly irreparable social divides. Through a comparative analysis of North American novels by James Baldwin, Toni Morrison, Margaret Atwood, Linda Hogan, Tim O'Brien and Susan Choi, I identify a common story their works all share: the narrative of affiliation. These novels of affiliation, I argue, represent the creation of lateral bonds of attachment among individuals of different races, ethnicities, genders, sexualities and classes. As a transgressive and unruly form of interpersonal relationship, affiliation works to bridge divisions by joining together the contradictory feelings of erotic desire and friendship. Defining an overlooked sub-genre of the post-1960 North American novel of development, this project illuminates the heterogeneous bonds of solidarity that undoubtedly arose during the sixties, yet have been continually silenced by national discourses of identity and multiculturalism. In the wake of neo-liberalism, 1960s collective projects for social change, including the New Left, the civil rights movement, Black Nationalism, feminism, and the Asian American movement, among others, appear historically and ideologically separate, and even antagonistic. In stark contrast, this dissertation illuminates the common ethics of affiliation that aligned these disparate movements and was built from collaborative, immanent and provisional attempts at repairing suffering and disparity. Positioned not within, but alongside the fraught history of the sixties, this project offers a new portrait of the subterranean modes of experimental living that animated the era.