cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Extending valuations to the field of rational functions using pseudo-monotone sequences
Creators: name: Peruginelli, Giulio
name: Spirito, Dario
Publisher: name: arXiv
Year: 2019
Subjects: subject: Rings and Algebras (math.RA)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 12J20, 13A18, 13F30

description: Let $V$ be a valuation domain with quotient field $K$. We show how to describe all extensions of $V$ to $K(X)$ when the $V$-adic completion $\widehat{K}$ is algebraically closed, generalizing a similar result obtained by Ostrowski in the case of one-dimensional valuation domains. This is accomplished by realizing such extensions by means of pseudo-monotone sequences, a generalization of pseudo-convergent sequences introduced by Chabert. We also show that the valuation rings associated to pseudo-convergent and pseudo-divergent sequences (two classes of pseudo-monotone sequences) roughly correspond, respectively, to the closed and the open balls of $K$ in the topology induced by $V$.
description: all comments are welcome!!
Additional file 7 of Incidence and outcomes of acute respiratory distress syndrome in intensive care units of mainland China: a multicentre prospective longitudinal study
Creators: name: Huang, Xu
name: Zhang, Ruoyang
name: Fan, Guohui
name: Wu, Dawei
name: Lu, Haining
name: Wang, Daoxin
name: Deng, Wang
name: Sun, Tongwen
name: Xing, Lihua
name: Liu, Shaohua
name: Wang, Shilei
name: Cai, Ying
name: Tian, Ye
name: Zhang, Yi
name: Xia, Jingen
name: Zhan, Qingyuan
Publisher: name: figshare
Year: 2020
Subjects: subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Science Policy
subject: Mental Health
subject: Hematology

description: Additional file 7: eTable 2. Resources and types of medical expenses of acute respiratory distress syndrome patients.
Quantum inequalities and `quantum interest' as eigenvalue problems
Creators: name: Fewster, Christopher J.
name: Teo, Edward
Publisher: name: arXiv
Year: 1999
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Quantum inequalities (QI's) provide lower bounds on the averaged energy density of a quantum field. We show how the QI's for massless scalar fields in even dimensional Minkowski space may be reformulated in terms of the positivity of a certain self-adjoint operator - a generalised Schroedinger operator with the energy density as the potential - and hence as an eigenvalue problem. We use this idea to verify that the energy density produced by a moving mirror in two dimensions is compatible with the QI's for a large class of mirror trajectories. In addition, we apply this viewpoint to the `quantum interest conjecture' of Ford and Roman, which asserts that the positive part of an energy density always overcompensates for any negative components. For various simple models in two and four dimensions we obtain the best possible bounds on the `quantum interest rate' and on the maximum delay between a negative pulse and a compensating positive pulse. Perhaps surprisingly, we find that - in four dimensions - it is impossible for a positive delta-function pulse of any magnitude to compensate for a negative delta-function pulse, no matter how close together they occur.
description: 18 pages, RevTeX. One new result added; typos fixed. To appear in Phys. Rev. D
Institutional Critique and Autobiography in the post-1968 Work of Clorindo Testa
Creators: Fitch, Nicholas
Publisher: name: Columbia University
Year: 2021
Subjects: subject: Art, Argentine
subject: Architecture
subject: FOS: Civil engineering
subject: Latin Americans
subject: Site-specific installations (Art)

description: This dissertation examines the post-1968 work of the Argentine artist and architect Clorindo Testa (1923-2013), arguing that 1968 represents a major turning point in his career, when he rethought his artistic practice in response to the dramatically altered institutional, political, and economic circumstances of Argentina in the late 1960s. Over the years between 1968 and 1974 Testa worked out the logic of this transformation and established the conceptual, stylistic, and thematic basis for the final four decades of his career. His studio production from this period is bracketed by the creation of two major, architecturally-themed works: the 1968 site-specific installation Prop for a Museum (Apuntalamiento para un museo) at National Museum of Fine Arts in Buenos Aires and the 1974 mural-sized Dwelling, Transportation, Work, and Recreation (Habitar, circular, trabajar y recrearse), conceived for the Galería Carmen Waugh, in the same city. This dissertation proposes that, on an international level, Prop for a Museum stands out as one of the pioneering works of the emergent conceptualist practice of institutional critique, and that together with Dwelling, Transportation, Work, and Recreation it represents a kind of manifesto for the new, post-1968 direction in the artist’s work.
Inertia drives a flocking phase transition in viscous active fluids
Creators: name: Chatterjee, Rayan
name: Rana, Navdeep
name: Simha, R. Aditi
name: Perlekar, Prasad
name: Ramaswamy, Sriram
Publisher: name: arXiv
Year: 2019
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: How fast must an oriented collection of extensile swimmers swim to escape the instability of viscous active suspensions? We show that the answer lies in the dimensionless combination $R=ρv_0^2/2σ_a$, where $ρ$ is the suspension mass density, $v_0$ the swim speed and $σ_a$ the active stress. Linear stability analysis shows that for small $R$ disturbances grow at a rate linear in their wavenumber $q$, and that the dominant instability mode involves twist. The resulting steady state in our numerical studies is isotropic hedgehog-defect turbulence. Past a first threshold $R$ of order unity we find a slower growth rate, of $O(q^2)$; the numerically observed steady state is {\it phase-turbulent}: noisy but {\it aligned} on average. We present numerical evidence in three and two dimensions that this inertia driven flocking transition is continuous, with a correlation length that grows on approaching the transition. For much larger $R$ we find an aligned state linearly stable to perturbations at all $q$. Our predictions should be testable in suspensions of mesoscale swimmers [D Klotsa, Soft Matter \textbf{15}, 8946 (2019)].
description: Version of the manuscript accepted in PRX
Institutional Change in Urban Environmentalism: A case study analysis of state-level land use legislation in California and New York
Creators: Connolly, James J. T.
Publisher: name: Columbia University
Year: 2012
Subjects: City planning
Urbanization--Environmental aspects
Land use

description: This study examines how community development and mainstream environmental groups form coalitions in state-level urban environmental legislation and the effect these coalitions have upon larger processes of institutional change. I argue that the alignment of community development and environmental interests is essential in the efforts to flatten the existing power hierarchy around land use decision-making and open up new possibilities for urban form. It helps to form a "counter-institutional" response which combines "pragmatic" and "purist" interests to resolve the social and environmental dilemmas of land use. This study begins by establishing the extent of the institutional divide between community development and environmentalism through an archival analysis of the 1970s debate over national land use legislation. It then presents two case studies of policies which seek to close this divide: (1) the New York Brownfield Opportunity Area Program of 2003 which was initiated by community groups and (2) the California Senate Bill 375 of 2008 which was initiated by environmental groups. The case studies employ interview data, surveys of organizations, observations of public meetings, and document review. The cases examined provide examples of attempts to expand potential governance outcomes by forming "heterarchic" alliances across policy silos in order to make land use regulation responsive to the wider concerns of urban environmentalists. I find that heterarchy is achieved in the California case, but not in the New York case. The varying degrees to which urban and environmental advocacy groups are able to bridge the institutional divide between them is determinant of these outcomes. The extent to which heterarchic governance is achieved, in turn, impacts the ability of each policy to change the institutional structure of land use regulation.
FlightGoggles: A Modular Framework for Photorealistic Camera, Exteroceptive Sensor, and Dynamics Simulation
Creators: name: Guerra, Winter
name: Tal, Ezra
name: Murali, Varun
name: Ryou, Gilhyun
name: Karaman, Sertac
Publisher: name: arXiv
Year: 2019
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: FlightGoggles is a photorealistic sensor simulator for perception-driven robotic vehicles. The key contributions of FlightGoggles are twofold. First, FlightGoggles provides photorealistic exteroceptive sensor simulation using graphics assets generated with photogrammetry. Second, it provides the ability to combine (i) synthetic exteroceptive measurements generated in silico in real time and (ii) vehicle dynamics and proprioceptive measurements generated in motio by vehicle(s) in a motion-capture facility. FlightGoggles is capable of simulating a virtual-reality environment around autonomous vehicle(s). While a vehicle is in flight in the FlightGoggles virtual reality environment, exteroceptive sensors are rendered synthetically in real time while all complex extrinsic dynamics are generated organically through the natural interactions of the vehicle. The FlightGoggles framework allows for researchers to accelerate development by circumventing the need to estimate complex and hard-to-model interactions such as aerodynamics, motor mechanics, battery electrochemistry, and behavior of other agents. The ability to perform vehicle-in-the-loop experiments with photorealistic exteroceptive sensor simulation facilitates novel research directions involving, e.g., fast and agile autonomous flight in obstacle-rich environments, safe human interaction, and flexible sensor selection. FlightGoggles has been utilized as the main test for selecting nine teams that will advance in the AlphaPilot autonomous drone racing challenge. We survey approaches and results from the top AlphaPilot teams, which may be of independent interest.
description: Initial version appeared at IROS 2019. Supplementary material can be found at https://flightgoggles.mit.edu. Revision includes description of new FlightGoggles features, such as a photogrammetric model of the MIT Stata Center, new rendering settings, and a Python API
Drosophila trichaetosa Hardy 1965
Creators: name: Rampasso, Augusto Santos
name: O'Grady, Patrick Michael
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Agaricales
Psathyrellaceae
Drosophila
Drosophila trichaetosa

description: Drosophila trichaetosa Hardy, 1965
Distribution: Endemic: Hawaii
 Additional References: Heed (1968); Mangan (1978); O’Grady et al. (2011); Rockwood et al. (1971); Throckmorton (1966)
description: Published as part of Rampasso, Augusto Santos & O'Grady, Patrick Michael, 2022, Distribution and Taxonomy of Endemic and Introduced Drosophilidae in Hawaii, pp. 1-80 in Zootaxa 5106 (1) on page 15, DOI: 10.11646/zootaxa.5106.1.1, http://zenodo.org/record/6336841
A literature review of constructed wetlands : a viable treatment system for acid mine drainage
Creators: name: Attwater, C. J.
Publisher: name: The University of British Columbia
Year: 2009

description: Wetlands are marsh-like ecosystems exhibiting varying degrees of saturation throughout the year and usually contain a variety of aquatic plants. They have proven capabilities in treating wastewater with physical, chemical and biological processes. Wetlands, especially plant-dominated wetlands, have the capability to remove or convert large quantities of pollutants including suspended solids, metals or excess nutrients by filtration, sedimentation, plant uptake, microbial degradation and other processes. A constructed wetland (CW) is a man-made, engineered, marsh-like area designed and constructed to treat wastewater in the same manner as a natural wetland. It is a practical alternative to mechanical wastewater treatment and water quality requirements, especially in remote areas. Although the treatment of wastewater using CW has been in use for over 40 years, it is not a well-known technology outside of scientific and engineering circles. CW have advantages over mechanical wastewater treatment systems such as simplicity in operation and maintenance and relatively low capital and operating costs. The requirements for a larger land base and a lack of standardized design criteria are two disadvantages to mechanical systems. Case studies from CW systems will illustrate that reductions in concentrations of various metals and sulphates and increased pH can be achieved when acid mine drainage is treated in a constructed wetland.
Binary inspiral, gravitational radiation, and cosmology
Creators: name: Finn, Lee Samuel
Publisher: name: arXiv
Year: 1996
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Observations of binary inspiral in a single interferometric gravitational wave detector can be cataloged according to signal-to-noise ratio $ρ$ and chirp mass $\cal M$. The distribution of events in a catalog composed of observations with $ρ$ greater than a threshold $ρ_0$ depends on the Hubble expansion, deceleration parameter, and cosmological constant, as well as the distribution of component masses in binary systems and evolutionary effects. In this paper I find general expressions, valid in any homogeneous and isotropic cosmological model, for the distribution with $ρ$ and $\cal M$ of cataloged events; I also evaluate these distributions explicitly for relevant matter-dominated Friedmann-Robertson-Walker models and simple models of the neutron star mass distribution. In matter dominated Friedmann-Robertson-Walker cosmological models advanced LIGO detectors will observe binary neutron star inspiral events with $ρ>8$ from distances not exceeding approximately $2\,\text{Gpc}$, corresponding to redshifts of $0.48$ (0.26) for $h=0.8$ ($0.5$), at an estimated rate of 1 per week. As the binary system mass increases so does the distance it can be seen, up to a limit: in a matter dominated Einstein-deSitter cosmological model with $h=0.8$ ($0.5$) that limit is approximately $z=2.7$ (1.7) for binaries consisting of two $10\,\text{M}_\odot$ black holes. Cosmological tests based on catalogs of the kind discussed here depend on the distribution of cataloged events with $ρ$ and $\cal M$. The distributions found here will play a pivotal role in testing cosmological models against our own universe and in constructing templates for the detection of cosmological inspiraling binary neutron stars and black holes.
description: REVTeX, 38 pages, 9 (encapsulated) postscript figures, uses epsf.sty
Effect of organic eutectic on nitrocellulose stability during artificial aging
Creators: name: Chelouche, Salim
name: Djalal Trache
name: Tarchoun, Ahmed Fouzi
name: Khimeche, Kamel
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biophysics
subject: Medicine
subject: Physiology
subject: FOS: Biological sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences

description: Recently, the eutectic composition of organic binary mixtures MENA+DPA has been found to be an efficient stabilizer of nitrocellulose. However, the behavior of such new stabilizer must be further investigated, especially after a long period of storage of the energetic composition. In this study, the stabilizing effect of the eutectic MENA+DPA on NC stability during artificial aging (at 338.65 K for 120 days), compared to its pure components, has been investigated by conventional stability tests and kinetic modeling. According to Bergmann & Junk (T = 405.15 K) results and over the entire period of aging, the eutectic MENA+DPA exhibits the best stabilizing effect on NC. The vacuum stability test (T = 353.15, 363.15, 373.15, and 383.15 K) results revealed that the amount of the evolved gas of NC containing this eutectic composition is very close to that of DPA, known as the conventional stabilizer. Furthermore, the kinetic modeling on VST data, obtained at four isothermal temperatures, was performed by two different methodologies, viz, fitting and free models to determine the kinetic triplets, which have been subsequently used to predict the storage lifetime for the studied systems. It was found that the NC stabilized by the eutectic MENA+DPA presents the highest value of the activation energy and has the longest storage lifetime during the entire heating period corroborating the stability tests results and affirming the excellent stabilizing effect of this mixture with respect to its pure component even if a long storage period is expected.
Installation Method: a tool for community engagement in Historic Preservation
Creators: de la Torre, Maria
Publisher: name: Columbia University
Year: 2016
Subjects: subject: Community development
subject: Historic preservation--Citizen participation
subject: Historic preservation
subject: Architecture
subject: FOS: Civil engineering

description: A recent shift in historic preservation theory and practice suggests that the field look at heritage through a holistic approach that broadens the range of values considered in understanding the significance of a site. This values-centered approach to preservation emphasizes the importance of including a wide array of stakeholders in preservation processes while considering the multiple layers of values that they ascribe to sites in decision-making. This implies interaction between field experts and non-experts throughout the significance assessment, planning, management, and conservation processes of historic preservation. Although the importance of this interaction is widely acknowledged, there has been little research on how it is to be done, and the field has developed limited tools for its application. This thesis focuses on the relationship between historic preservation experts and local communities during the early stages of the preservation process, and develops a toolset that aids in their interaction. Through a case-study experiment, this project explores the possibility of using spatial installations as a means of communication between the two parties in order to identify the values that local communities ascribe to their heritage. It proposes that the alteration of space, and its integration with ethnographic methods of interaction, bridges barriers between experts and local communities, producing a richer insight into the significance of historic sites. As a case-study to test this proposal, a spatial installation was built in Jordán Sube, a small town in Colombia. The installation was used to foster a conversation with the town’s inhabitants about their heritage. This experiment concluded in a general strategy for implementing spatial installations as a method for community engagement in historic preservation projects.
Landau levels in twisted bilayer graphene and semiclassical orbits
Creators: name: Hejazi, Kasra
name: Liu, Chunxiao
name: Balents, Leon
Publisher: name: arXiv
Year: 2019
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Twisted bilayer graphene has been argued theoretically to host exceptionally flat bands when the angle between the two layers falls within a magic range near 1.1$^\circ$. This is now strongly supported by experiment, which furthermore reveals dramatic correlation effects in the magic range due to the relative dominance of interactions when the bandwidth is suppressed. Experimentally, quantum oscillations exhibit different Landau level degeneracies when the angles fall in or outside the magic range; these observations can contain crucial information about the low energy physics. In this paper, we report a thorough theoretical study of the Landau level structure of the non-interacting continuum model for twisted bilayer graphene as the magnetic field and the twist angle are tuned. We first show that a discernible difference exists in the butterfly spectra when twist angle falls in and outside the magic range. Next, we carry out semiclassical analysis in detail, which quantitatively determines the origin of the low energy Landau levels from the zero field band structure. We find that the Landau level degeneracy predicted in the above analyses is capable of partially explaining features of the quantum oscillation experiments in a natural way. Finally, topological aspects, validity, and other subtle points of the model are discussed.
The Cosmological Constant and Dark Energy
Creators: name: Peebles, P. J. E.
name: Ratra, Bharat
Publisher: name: arXiv
Year: 2002
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Physics invites the idea that space contains energy whose gravitational effect approximates that of Einstein's cosmological constant, Lambda; nowadays the concept is termed dark energy or quintessence. Physics also suggests the dark energy could be dynamical, allowing the arguably appealing picture that the dark energy density is evolving to its natural value, zero, and is small now because the expanding universe is old. This alleviates the classical problem of the curious energy scale of order a millielectronvolt associated with a constant Lambda. Dark energy may have been detected by recent advances in the cosmological tests. The tests establish a good scientific case for the context, in the relativistic Friedmann-Lemaitre model, including the gravitational inverse square law applied to the scales of cosmology. We have well-checked evidence that the mean mass density is not much more than one quarter of the critical Einstein-de Sitter value. The case for detection of dark energy is serious but not yet as convincing; we await more checks that may come out of work in progress. Planned observations might be capable of detecting evolution of the dark energy density; a positive result would be a considerable stimulus to attempts to understand the microphysics of dark energy. This review presents the basic physics and astronomy of the subject, reviews the history of ideas, assesses the state of the observational evidence, and comments on recent developments in the search for a fundamental theory.
description: 55 pages. RMP (2003) in press. Includes additions stimulated by comments from arXiv readers
Carnet nº 13, commencé à Hiroshima (p. 20)
Creators: name: Péraire, Lucien
name: CNRS
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2023

description: created: 22-10-1930
Analysis of Taxpayers’ Intention to Use Tax E-Filing System in Tanzania: Controlling for Self-Selection Based Endogeneity
Creators: name: Kimea, Alfred
name: Chimililia, Cyril
name: Sichone, Joyce
name: Kimea, Alfred
name: Chimililia, Cyril
name: Sichone, Joyce
Publisher: name: Unknown
Year: 2019
Subjects: subject: Public Economics
subject: Research and Development/Tech Change/Emerging Technologies
subject: Electronic tax filing
subject: Self-selection endogeneity
subject: Technology Acceptance Model

description: This paper aims at analysing factors that influence taxpayers’ intention to use electronic tax filing system. The paper employs Technology Acceptance Model (TAM) framework. We first estimated traditional TAM model using OLS. Using econometric tests we observed self-selection endogeneity bias in intention to use e-filing system. To account for this bias we estimated endogenous switching regression model. Results of endogenous switching model show that risk, social influence and performance expectancy have significant effects on intention to use e-filing. Further, we found that these factors affect users and non-users intentions differently, calling for differentiated strategies in influencing e-filing use intention. Lastly, we recommended both administrative and technical issues to be considered for enhanced intention to use and adoption of e-filing system.
Industrial Growth and Policy in Zambia: Lessons from South Korea
Creators: name: Chansa, Frank
name: Mubanga, Ngao
name: Mudenda, Dale
name: Ndulo, Manenga
name: Chansa, Frank
name: Mubanga, Ngao
name: Mudenda, Dale
name: Ndulo, Manenga
Publisher: name: Unknown
Year: 2019
Subjects: subject: Agribusiness
subject: Industrial Organization
subject: Teaching/Communication/Extension/Profession
subject: Industrial policy
subject: youth unemployment
subject: industrial growth
subject: state ownership
subject: agribusiness
subject: employment creation

description: This paper discusses the divergence in industrial growth for two countries Zambia and South Korea and tries to draw lessons from South Korea for Zambia’s industrial policy and strategies that leads to industrial transformation and job creation. The conceptual framework argues that South Korea having evolved into a developmental state was fundamental to its transformation to an industrial state while Zambia failed to advance beyond the development state status.
Haptics-Augmented Physics Simulation: Coriolis Effect
Creators: name: Hamza-Lup, Felix G.
name: Page, Benjamin
Publisher: name: arXiv
Year: 2019
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Physics Education (physics.ed-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: The teaching of abstract physics concepts can be enhanced by incorporating visual and haptic sensory modalities in the classroom, using the correct perspectives. We have developed virtual reality simulations to assist students in learning the Coriolis effect, an apparent deflection on an object in motion when observed from within a rotating frame of reference. Twenty four undergraduate physics students participated in this study. Students were able to feel the forces through feedback on a Novint Falcon device. The assessment results show an improvement in the learning experience and better content retention as compared with traditional instruction methods. We prove that large scale deployment of visuo-haptic reconfigurable applications is now possible and feasible in a science laboratory setup.
description: ISSN: 1844-8933
Constructed wetland : Bullmoose minesite, Tumbler Ridge, B.C.
Creators: name: Davies, G. W.
Publisher: name: The University of British Columbia
Year: 2009

description: Wetland development on a minesite sedimentation pond consisted of the alterations of a sedimentation pond to control water flow rates and to aid in planting cattails, rushes, sedges and other aquatic plants into the system in an attempt to reduce nutrient enrichment. It is believed that wetlands can act as a buffer between the mine working and the receiving environment. A wetland was designed and constructed to establish both aerobic and anaerobic conditions within the rougher lagoon. The aerobic cell was planted with a diversity of marsh plant species such as sedge (Carex sp) which is more desirable for water treatment purposes. The anaerobic cell uses an underflow method. Flows are adjusted using control gates and weirs. Both cells were filled with a substrate suitable for wetland development. The objectives of the project are to design and monitor the water treatment results of a large scale constructed wetland. The specific objectives will be to determine design specifications for the construction of wetlands on the other minesite sedimentation ponds, determine optimum water retention time on treatment results, quantify the removal of nitrogen from the water passing through the different wetland cells during the year and to provide information on the operation and maintenance of a wetland to enhance plant survival and growth.
Insights from College Algebra Students' Reinvention of Limit at Infinity
Creators: McGuffey, William
Publisher: name: Columbia University
Year: 2018
Subjects: Mathematics--Study and teaching
Calculus
College students

description: The limit concept in calculus has received a lot of attention from mathematics education researchers, partly due to its position in mathematics curricula as an entry point to calculus and partly due to its complexities that students often struggle to understand. Most of this research focuses on students who had previously studied calculus or were enrolled in a calculus course at the time of the study. In this study, I aimed to gain insights into how students with no prior experience with precalculus or calculus might think about limits via the concept of limit at infinity, with the goal of designing instructional tasks based on these students’ intuitive strategies and ways of reasoning. In particular, I designed a sequence of instructional tasks that starts with an experientially realistic starting point that involves describing the behavior of changing quantities in real-world physical situations. From there, the instructional tasks build on the students’ ways of reasoning through tasks involving making predictions about the values of the quantity and identifying characteristics associated with making good predictions.
      These instructional tasks were developed through three iterations of design research experimentation. Each iteration included a teaching experiment in which a pair of students engaged in the instructional tasks under my guidance. Through ongoing and reflective analysis, the instructional tasks were refined to evoke the students’ intuitive strategies and ways of thinking and to leverage these toward developing a definition for the concept of limit at infinity. The final, refined sequence of instructional tasks together with my rationale for each task and expected student responses provides insights into how students can come to understand the concept of limit at infinity in a way that is consistent with the formal definition prior to receiving formal instruction on limits.
      The results presented in this dissertation come from the third and final teaching experiment, in which Jon and Lexi engaged in the sequence of instructional tasks. Although Jon and Lexi did not construct a definition of limit at infinity consistent with a formal definition, they demonstrated many strategies and ways of reasoning that anticipate the formal definition of limit at infinity. These include identifying a limit candidate, defining the notion of closeness, describing the notion of sufficiently large, and coordinating the notion of closeness in the range with the notion of sufficiently large in the domain.  On the other hand, Jon and Lexi demonstrated some strategies and ways of reasoning that potentially inhibited their development of a definition consistent with the formal definition. Pedagogical implications on instruction in calculus and its prerequisites are discussed as well as contributions to the field and potential directions for future research.
Manuscript
Creators: name: Havens, Mark Randall
Publisher: name: OSF
Year: 2025

description: Primary manuscript for the Fieldprint Framework: a foundational theory redefining intelligence as a distributed coherence field. This work introduces the Fieldprint Map and models intelligence across humans, AIs, and natural systems through recursive fidelity, resonance, and emergence. See linked addenda for dyadic dynamics and simulation (The Mirror Equations, 1.02a).
Institutional and Patient Level Predictors of Multi-Drug Resistant Healthcare-Associated Infections
Creators: Pogorzelska, Monika
Publisher: name: Columbia University
Year: 2011
Subjects: Epidemiology
Drug resistance in microorganisms
Staphylococcus aureus infections
Infection--Prevention
Clostridium difficile
Enterococcal infections
Methicillin resistance

description: Healthcare-associated infections (HAI) caused by multi-drug resistant organisms (MDRO) are an important patient safety concern resulting in a substantial financial and clinical burden. This dissertation aims to contribute to the evidence base on institutional and patient level factors that predict multi-drug resistant infections in the hospital setting. In the first chapter, I review the evidence base on patient-level risk factors for methicillin-resistant Staphylococcus aureus (MRSA) bloodstream infections (BSI), system-level factors associated with implementation of infection control policies and MDRO rates, and the current knowledge on the use of infection control policies on the national level. In the second chapter, I use data from a national cross-sectional study to describe the range of MDRO screening and infection control policies in U.S. hospitals and identify predictors of their presence and implementation. In the third chapter, using data from a cross-sectional study of California hospitals, I assess the association between the presence and implementation of infection control policies for MDRO infections and rates of BSI caused by MRSA or vancomycin-resistant Enterococcus and infections caused by Clostridium difficile. Next, I identify risk factors for healthcare-associated MRSA BSI in a nested case control study using two sets of controls. In the last chapter, I conclude by summarizing the findings of these three studies.
Figure S4 from Aggression and discrimination among closely versus distantly related species of Drosophila
Creators: name: Gupta, Tarun
name: Howe, Sarah E.
name: Zorman, Marlo L.
name: Lockwood, Brent L.
Publisher: name: The Royal Society
Year: 2019
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Ecology
subject: 60801 Animal Behaviour

description: Latency to lunge is the delay to onset of aggression (minutes) following the beginning of a fight. There was no significant difference between the latencies to lunge at conspecifics vs. heterospecifics (2-way ANOVA, direction of lunge effect, F1,177 = 0.00057, P = 0.98, direction of lunge x species pair interaction, F5,177 = 1.515, P = 0.19), and all species pairs initiated aggression at approximately the same time (2-way ANOVA, species pair effect, F5,177 = 1.088, P = 0.3686).
Drosophila imparisetae Hardy 1965
Creators: name: Rampasso, Augusto Santos
name: O'Grady, Patrick Michael
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Agaricales
Psathyrellaceae
Drosophila
Drosophila imparisetae

description: Drosophila imparisetae Hardy, 1965
Distribution: Endemic: Hawaii
 Additional References: Craddock et al. (2018); Hardy et al. (1981); Heed (1968); Magnacca et al. (2008); O’Grady et al. (2011); Rockwood et al. (1971); Throckmorton (1966)
description: Published as part of Rampasso, Augusto Santos & O'Grady, Patrick Michael, 2022, Distribution and Taxonomy of Endemic and Introduced Drosophilidae in Hawaii, pp. 1-80 in Zootaxa 5106 (1) on page 16, DOI: 10.11646/zootaxa.5106.1.1, http://zenodo.org/record/6336841
Amplitude Equations for Electrostatic Waves: multiple species
Creators: name: Crawford, John David
name: Jayaraman, Anandhan
Publisher: name: arXiv
Year: 1997
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Condensed Matter (cond-mat)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The amplitude equation for an unstable electrostatic wave is analyzed using an expansion in the mode amplitude $A(t)$. In the limit of weak instability, i.e. $γ\to 0^+$ where $γ$ is the linear growth rate, the nonlinear coefficients are singular and their singularities predict the dependence of $A(t)$ on $γ$. Generically the scaling $|A(t)|=γ^{5/2}r(γt)$ as $γ\to 0^+$ is required to cancel the coefficient singularities to all orders. This result predicts the electric field scaling $|E_k|\simγ^{5/2}$ will hold universally for these instabilities (including beam-plasma and two-stream configurations) throughout the dynamical evolution and in the time-asymptotic state. In exceptional cases, such as infinitely massive ions, the coefficients are less singular and the more familiar trapping scaling $|E_k|\simγ^2$ is recovered.
description: 41 pages (Latex/RevTex), 1 postscript figure included (psfig). Figure also available in hard copy from the authors
Direct Tension Bar for Testing at Intermediate Strain Rate
Creators: name: Puneeth Jakkula
Publisher: name: figshare
Year: 2019
Subjects: subject: Mechanical Engineering
subject: FOS: Mechanical engineering
subject: 90202 Automotive Engineering Materials
subject: 120402 Engineering Design Knowledge
subject: FOS: Other engineering and technologies

description: Dynamic material characterization at intermediate strain rates (10 - 100 s/1) is one of the major concerns in crash engineering. Servo-hydraulic machines and drop weight towers are regarded as the solution for measurement of mechanical properties at these strain rates. However, the signals are recorded with large detrimental oscillations and are not reliable. Nevertheless, it is important to perform material characterization to determine the material response and deformation mechanism in the transition regime from low to high strain rates.This work focuses on developing a Direct-Impact Tension Bar (DITB), an apparatus with a long usable pulse duration to perform a tensile test at strain rates between (10 - 100 s/1). This setup can bridge the gap between servo-hydraulic universal testing machines and the classical Split-Hopkinson Tension Bar (SHTB). The DITB functions on the principle of already known Direct Pressure Hopkinson Bars in so far as that no input bar is present.For finding an optimal design, several parameter studies have been conducted using LS-Dyna including analytical solutions for the time evolution of strain rate and stress. A prototype version of a 40 m long bar with 16 ms of usable experimental pulse duration has been built and demonstrates a satisfactory agreement with explicit Finite Element Simulations. Problems like the plane of symmetry and loss of kinetic energy, have been investigated to optimize the setup to produce high quality signals.In this work, a sheet-type polycarbonate specimen is chosen for tensile testing. Polycarbonate exhibits low impedance and the specimens of this material are easy to manufacture. The specimens are milled on a CNC machine to t the specimen adapters. Additionally, this work considers the use of fast line-scan and high-speed cameras to locally measure specimen strain, rather than extracting strain data from the time history of the transmitted waves. A custom-made code extracts the strain data from line-scan, and high-speed camera strain data is extracted by Digital Image Correlation. This approach provides accurate nominal stress-strain results. The DITB has been a successful model with clean and smooth stress-strain curves without any evidence of oscillations.
Institutional Resilience and Informality: The Case of Land Rights Mechanisms in Greater Ouagadougou, Burkina Faso.
Creators: Touber, Julie
Publisher: name: Columbia University
Year: 2016
Subjects: subject: Right of property
subject: Land use--Law and legislation
subject: Political science
subject: FOS: Political science
subject: Africans
subject: Sustainability

description: Land informality, or the absence of clear property rights, has been identified as a strong cause for lower economic development performance. In Africa, despite the presence of a formal institutional setting of property rights and established laws, the practice of land rights has favored a persistent informal institutional regime. This dissertation addresses the reasons for the persistence of land informality in the presence of formal laws in the case of Ouagadougou in Burkina Faso. Using process tracing, I dissect the processes of land conflict resolutions within the formal and informal institutions in order to pinpoint reasons for such prolong informality.  I identify a very coherent and organized institutional set within the customary institutions, and the ambiguous relationship these institutions have with formal institutions. The inability of the formal institutions to resolve the informality issue is not the result of incompetence; it is the result of survival mechanisms from both the informal and formal institutions. Informality is the effect of the layered institutional setting and persists because of the resilience of survival mechanisms.
Drosophila ornata Hardy and Kaneshiro 1969
Creators: name: Rampasso, Augusto Santos
name: O'Grady, Patrick Michael
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Agaricales
Psathyrellaceae
Drosophila
Drosophila ornata

description: Drosophila ornata Hardy and Kaneshiro, 1969
Distribution: Endemic: Kauai
 Additional References: Carson & Kaneshiro (1976); Craddock et al. (2018); Kambysellis (1993); Montgomery (1975); Rockwood et al. (1971); Spieth (1982, 1984)
description: Published as part of Rampasso, Augusto Santos & O'Grady, Patrick Michael, 2022, Distribution and Taxonomy of Endemic and Introduced Drosophilidae in Hawaii, pp. 1-80 in Zootaxa 5106 (1) on page 21, DOI: 10.11646/zootaxa.5106.1.1, http://zenodo.org/record/6336841
Homologically trivial symplectic cyclic actions need not extend to Hamiltonian circle actions
Creators: name: Chiang, River
name: Kessler, Liat
Publisher: name: arXiv
Year: 2019
Subjects: subject: Symplectic Geometry (math.SG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53D35, 53D20, 57R17, 57S15

description: We give examples of symplectic actions of a cyclic group, inducing a trivial action on homology, on four-manifolds that admit Hamiltonian circle actions, and show that they do not extend to Hamiltonian circle actions. Our work applies holomorphic methods to extend combinatorial tools developed for circle actions to study cyclic actions.
The modelling and analysis of fractional-order control systems in discrete domain
Creators: name: Petras, I.
name: Dorcak, L.
name: Kostial, I.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 26A33, 93C55 (Primary) 65D25, 93C05 (Secondary)

description: This paper deals with fractional-order controlled systems and fractional-order controllers in the discrete domain. The mathematical description by the fractional difference equations and properties of these systems are presented. A practical example for modelling the fractional-order control loop is shown and obtained results are discussed in conclusion.
description: LaTeX v.2.09, 4 pages, 1 figure
Linearly dependent powers of binary quadratic forms
Creators: name: Reznick, Bruce
Publisher: name: arXiv
Year: 2019
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11E76, 11P05, 14M99, 11D25, 11D41

description: Given an integer $d \ge 2$, what is the least $r$ so that there is a set of binary quadratic forms $\{f_1,\dots,f_r\}$ for which $\{f_j^d\}$ is non-trivially linearly dependent? We show that if $r \le 4$, then $d \le 5$, and for $d \ge 4$, construct such a set with $r = \lfloor d/2\rfloor + 2$. Many explicit examples are given, along with techniques for producing others.
description: 25 pages
Yorn HaShoah (Holocaust Memorial Day) liturgies: Incorporating a Yom HaShoah liturgy within the Christian liturgical calendar in Australia
Creators: name: Allen, Barbara
Publisher: name: Australian Catholic University
Year: 2000

description: In this thesis I propose that the Church should incorporate a Y om HaShoah (Holocaust Memorial Day) Liturgy within its liturgical calendar in Australia. The thesis analyses the critical issues in developing a liturgy for such a service and proposes a liturgy designed for use in Australia. These critical issues include: the naming of the liturgy (the different names available and in use, each with its particular symbolic power); and the necessity for the commemoration to be incorporated within a Christian place of worship and within the Christian liturgical calendar (including why it should be held at a different time from the Jewish Yorn HaShoah, due to different agendas). It examines the reasons for the 27th of Nisan being chosen as the date for commemoration of Yorn HaShoah within the Jewish community. To place the need for the service in context, the thesis reviews the history of JewishChristian relations and briefly discusses flawed theology. It analyses the experience of Jews in Australia and the influence this has had on understanding in Australia about the Holocaust. The commemoration of Y om HaShoah in Australia is contrasted with the situation in three other countries - Canada, Great Britain and the USA. The postHolocaust thinking of several Jewish and Christian theologians is examined in some detail because post-Holocaust theology should influence the planning, writing and conducting of liturgy, especially liturgy for Yorn HaShoah. A discussion of the components of a Yorn HaShoah liturgy follows, which includes both suggestions for and the rationale behind the consideration of several key dates and seasons as a possible time for a Yorn HaShoah service. There is a reminder of some of the key differences between a Christian and a Jewish Yorn HaShoah Service, which is followed by guidelines to consider when planning an interfaith service. The thesis contains a critique of three liturgies, two from the United States, the other from Australia. These critiques are used to develop a liturgy for use in Australian communities which incorporates Australian materials and resources. The thesis concludes that a Yorn HaShoah Service could benefit the Church and the wider community, as well as foster better relations between the Christian and Jewish communities. Individuals would be open to change, and churches to transformation. Developing a liturgy for a Y om HaShoah service requires incorporating elements from many disciplines. It is only by understanding the biblical, historical, theological and liturgical perspectives on Jewish-Christian relations, as well as the broader social and historical context within Australia, that a relevant and appropriate liturgy can be developed and an appropriate date in the Australian liturgical calendar chosen.