cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Bianchi IX cosmologies in the Einstein-Skyrme system in a sector with non-trivial topological charge
Creators: name: Canfora, Fabrizio
name: Dimakis, Nikolaos
name: Giacomini, Alex
name: Paliathanasis, Andronikos
Publisher: name: arXiv
Year: 2019
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The dynamics of the most general Bianchi IX cosmology with three time dependent scale factors for the Einstein-Skyrme system is analyzed. For the Skyrmion, a generalized hedgehog ansatz with unit baryon charge is introduced. The most remarkable feature of this ansatz is that, in the above topologically non-trivial sector with unit topological charge, the Skyrme field equations are identically satisfied on any Bianchi IX metric. We will show that due to this feature the complete set of coupled Einstein-Skyrme field equations can be deduced from a suitable minisuperspace Lagrangian. The latter allows to perform a systematic study of the integrability properties of the Einstein-Skyrme system for the Bianchi IX cosmology. Moreover, some analytic and algebraic solutions for the Einstein-Skyrme model are derived. Another remarkable consequence of the present formalism is that it is possible to derive the Wheeler de-Witt equation for the Bianchi IX metric in the Einstein-Skyrme cosmology in which all the effects of the Skyrmion are encoded in an effective potential of the minisuperspace Lagrangian.
description: LaTeX, 31 pages. Accepted for publication in Physical Review D
Identifying the burdens for informal caregivers of tracheostomy-dependent people: a scoping review
Creators: name: Haiyan Luo
name: Miao, Xiao
Publisher: name: OSF Registries
Year: 2024
Subjects: subject: Family Practice Nursing
subject: Medicine and Health Sciences
subject: Nursing
subject: FOS: Health sciences

description: We will conduct this scoping review in the following five steps:
Stage 1: identifying the research question
Review questions
1.What care burdens do informal caregivers suffer from caring for people with tracheostomy? In terms of physical, psychological, emotional, financial, social strains?
2.What are the problems and challenges these burdens? In terms of problems, encompassing pain, fatigue, sleep problems, anxiety, depression, et al.
3.Are there any intervention measures to solve the problems faced by tracheostomy caregivers and reduce their burdens?

Review objectives
1.To identify possible burdens for informal caregivers of people with tracheostomy.
2.To classify the domains and manifestation of these outcomes experience by caregivers
3.And if possible to find out instruments(validity, reliability, administration methods, duration, etc., ) available for the measurement burdens.
4.To identify the gap and inform future research perspectives.

Stage 2: identifying relevant studies
We will use the PCC mnemonic (population, concept, and context) to delineate the scope and setting of this review. The scoping review targets “Informal Caregiver” as population, “Caregiver Burden” as concept, and “tracheostomy” as context.
A systematic search will be conducted in PubMed, PsycINFO via EBSCO, Embase, Web of Science and CINAHL via EBSCO. All databases will undergo a comprehensive search spanning from their inception to the completion of the search process. Furthermore, the eligibility of included studies will be verified by examining the reference lists associated with them. Grey literature will be searched from various sources, such as ClinicalTrials.gov, NAHRS, and Google. MeSH terms for the key concepts will be used: “Informal caregiver”, “Caregiver Burden”, and “tracheotomy”.

Stage 3: Study Selection
We will use Covidence to select study. Two researchers will independently undertake the citation selection process. Should discrepancies arise in the selection process, a third reviewer will be involved, and resolutions will be achieved through joint discussion. Researchers will finish all the steps based on inclusion criteria (Population: informal caregivers of people with tracheostomy, Concept: caregiver burdens, Context: people with trachostomy irrespective of any ages) and exclusion criteria (Population: professional caregivers such as nurses, doctors, trained social workers).

Stage 4: Charting the Data
Two reviewers will finish extracting the data. A draft charting table will be developed and piloted at the protocol stage to record the key information of the source.

Stage 5: Collating, Summarising and Reporting the Results
This step need three reviewers. The presentation of findings will adhere to the PRISMA-ScR checklists.
A Model Of Technology Development And Adoption
Creators: name: Schmitz, James
name: Schmitz, James
Publisher: name: Unknown
Year: 1986
Subjects: Research Methods/ Statistical Methods

description: This paper develops a simple model in which both the development and adoption of innovation are determined in equilibrium. The model is used to examine a number of issues involving the development and subsequent use of innovation. For example, conditions are derived under which increases in imitation protection lead to a less "progressive" industry and decreases in expected welfare. The importance of studying these dimensions jointly is also highlighted by showing that policies which spur R&D can retard licensing, and to an extent which negates the increased R&D efforts.
Examining waste cooking oil supply for campus biodiesel production and implementation
Creators: name: Chan, David
name: Gomes, Cheryl
name: Howatson, Fraser
name: Hudkins, Jesse
name: Laesecke, Jan
name: Salvatore, Danielle
Publisher: name: The University of British Columbia
Year: 2015

description: This study investigates the feasibility of already-­‐existing supply and demand of biodiesel at the University of British Columbia. A student-­‐led project operating under an Engineers for a Sustainable World chapter manages a batch biodiesel processing operation in conjunction with the department of Chemical and Biological Engineering. Currently, the group produces 60 Liter batches for distribution to housing and dining and services. The fuel is currently dispensed through a blend-­‐on-­‐demand station, which mixes petroleum diesel and biodiesel in concentrations set by the user. While current fuel demand is being met, there exists the potential to produce more fuel for the AMS. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
Transforming Our Democracy: Participatory Budgeting and the Importance of Deliberation in Civic Engagement
Creators: Yu, Francis
Publisher: name: Columbia University
Year: 2019
Subjects: City planning
Community development, Urban
Local budgets--Citizen participation
Local government--Citizen participation

description: Participatory Budgeting (PB) exists at varying scales in more than 3,000 cities across the globe and the process continues to expand both in scale and in new technology, particularly as digital technologies are being integrated into a myriad of City and governmental functions. As this expansion occurs, it is critical to explore the transformative and deliberative nature of the process upon which projects are debated and developed among PB participants (often referred to as Budget Delegates), relevant City agencies, and implementation partners. This research takes a case study approach to explore the Vallejo PB program in the City of Vallejo, California, the first American city to adopt PB on a citywide scale, and explores how PB serves as a space that provides new modes of civic engagement and leadership, lessons in collaboration with other community members and City agencies, and a deep and critical understanding of local governance processes and functions.
Potential Effect On Small-Farm Technical Assistant Programs On Public Revenue Accounts
Creators: name: Smith, Eldon D.
name: Hall, Harry H.
name: Simon, Don
name: Smith, Eldon D.
name: Hall, Harry H.
name: Simon, Don
Publisher: name: Unknown
Year: 1980
Subjects: Agribusiness

description: This paper presents a conceptual model for considering the tradeoffs between technical assistance and public-welfare assistance for impoverished limited-resource farmers. The hypothesis is that a combination of technical assistance and welfare assistance will be more cost-effective than welfare assistance alone. For a sample of 120 limited-resource farmers in the Appalachian region of Eastern Kentucky, some on welfare assistance, the potential effect of technical assistance on public-revenue accounts is evaluated.
Collective magnetization dynamics in nano-arrays of thin FePd discs
Creators: name: Ciuciulkaite, Agne
name: Östman, Erik
name: Brucas, Rimantas
name: Kumar, Ankit
name: Verschuuren, Marc A.
name: Svedlindh, Peter
name: Hjörvarsson, Björgvin
name: Kapaklis, Vassilios
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report on the magnetization dynamics of a square array of mesoscopic discs, fabricated from an iron palladium alloy film. The dynamics properties were explored using ferromagnetic resonance measurements and micromagnetic simulations. The obtained spectra exhibit features resulting from the interactions between the discs, with a clear dependence on both temperature and the direction of the externally applied field. We demonstrate a qualitative agreement between the measured and calculated spectra. Furthermore, we calculated the mode profiles of the standing spin waves excited during a time-dependent magnetic field excitations. The resulting maps confirm that the features appearing in the ferromagnetic resonance absorption spectra originate from the temperature and directional dependent inter-disc interactions.
description: 9 pages, 10 figures
title: Poetry, Protest, and Politics: The Building Blocks of Social Justice
Creators: name: Story, Chelsea
Publisher: name: Maryland Shared Open Access Repository
Year: 2025
Subjects: subject: social justice
subject: politics
subject: poetry
subject: protest
subject: art activism

description: The following text is an examination of the pursuit of social and racial justice with emphasis on why such work is crucial for all people. Three analysis papers and a formal introduction project and amplify the voices of Black Americans and their allies at this critical period in United States history. Each paper examines one of three valuable and varied mediums used to create change: protest, poetry, and politics. The first paper zooms in on the poetic prose of Jason Reynolds’ novel "Long Way Down," written as a fictional but realistic and intimate portrait of how one Black American teenager wrestles with what justice on the street looks like following his brother’s murder and what it might look like should he break the cycle of relying on the rules of revenge he learned in his neighborhood. Reynolds’ work provides crucial context for the daily lives of many young Black men in America and the importance of examining how we define justice. The second paper examines how the outrage and heartache following George Floyd’s murder in 2020 was channeled into visual art as a form of protest and continues to impact interpretation and participation in current and historical events.The final paper adopts a wider lens again to examine the United States Congress where Jasmine Crockett is the representative for her district in Texas. Her voice, which has gone viral many times since her work in the House began, serves to emphasize how the past and present are colliding at this moment in United States politics and must be examined and disrupted to dismantle the dangerous resurgence of white supremacy in government and establish true justice in America.
title: Use of Mouse Tracking to evaluate the Operator Efficiency on Train Dispatcher Workstations
Creators: name: Pachl, Jörn
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2016
Subjects: subject: Eisenbahn
subject: Mousetracking
subject: Fahrdienstleiter
subject: railway
subject: train dispatcher
subject: mouse tracking
subject: workstations
subject: 625

description: Die Bedienereffizienz beschreibt die Fähigkeit des Bedieners, Bedienungshandlungen räumlich und zeitlich so zu bündeln, dass sich ein effizienter, d. h. Zeit sparender Bedienungsablauf ergibt. Dabei besteht ein enger Zusammenhang mit dem Situationsbewusstsein. Die Bedienereffizienz hängt sowohl von der Gestaltung der Bedienoberfläche als auch vom Trainingsstand des Bedieners ab. Mousetracking ist eine im Usability Engineering bewährte Methode zur Untersuchung des Bedienerverhaltens. In zwei Fallstudien wird anhand vom Stellwerkssimulationen im Eisenbahnbetriebslabor untersucht, ob sich durch Mousetracking-Analysen sowohl der Einfluss des Trainingsstandes unterschiedlicher Bediener als auch der Einfluss geänderter Bedienfunktionen auf die Bedienereffizienz nachweisen lässt.
description: The operator efficiency describes the ability of an operator to bundle operational actions in terms of space and time in order to achieve an efficient, i. e. time saving operational process with a close correlation with the situational awareness. The operator efficiency depends as well on the design of the user interface as on the training level of the operator. Mouse tracking is a proven method applied in usability engineering to study operator behaviour. Two case studies based on train dispatcher workstation simulations in a railroad operations laboratory have been investigating whether mouse tracking analyses allow to prove the influence of the training level of different operators as well as the influence of changed operational functions on the opera¬tor efficiency.
Fishers and fisheries of Moreton Bay
Creators: name: Thurstan, Ruth
name: Fraser, Kerrie
name: Brewer, David
name: Buckley, Sarah
name: Dineson, Zena
name: Skewes, Tim
name: Courtney, Tony
name: Pollock, Barry
Publisher: name: figshare
Year: 2019
Subjects: subject: 70499 Fisheries Sciences not elsewhere classified
subject: FOS: Agriculture, forestry and fisheries

description: Paper contribution to the Moreton Bay (Quandamooka) & Catchment eBook available on www.moretonbayfoundation.org.
Dynamical entropy for systems with stochastic perturbation
Creators: name: Ostruszka, Andrzej
name: Pakonski, Prot
name: Slomczynski, Wojciech
name: Zyczkowski, Karol
Publisher: name: arXiv
Year: 1999
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Dynamics of deterministic systems perturbed by random additive noise is characterized quantitatively. Since for such systems the KS-entropy diverges we analyse the difference between the total entropy of a noisy system and the entropy of the noise itself. We show that this quantity is non negative and in the weak noise limit is conjectured to tend to the KS-entropy of the deterministic system. In particular, we consider one-dimensional systems with noise described by a finite-dimensional kernel, for which the Frobenius-Perron operator can be represented by a finite matrix.
description: REVTeX 18 pages, 9 figures Revised section II, some minor improvements and corrections
Aquaculture in Moreton Bay
Creators: name: West, Elizabeth
name: Conacher, Carol
name: Dexter, John
name: Lee, Peter
name: Heidenreich, Michael
name: Paterson, Brian
Publisher: name: figshare
Year: 2019
Subjects: subject: 70401 Aquaculture
subject: FOS: Agriculture, forestry and fisheries

description: Paper contribution to the Moreton Bay (Quandamooka) & Catchment eBook available on www.moretonbayfoundation.org.
Fine Structure of the QCD String Spectrum
Creators: name: Juge, K. Jimmy
name: Kuti, Julius
name: Morningstar, Colin
Publisher: name: arXiv
Year: 2002
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Using advanced lattice methods in Quantum Chromodynamics, three distinct scales are established in the excitation spectrum of the gluon field around a static quark-antiquark pair as the color source separation R is varied. On the shortest length scale, the excitations are consistent with states created by local gluon field operators arising from a multipole operator product expansion. An intermediate crossover region below 2 fm is identified with a dramatic rearrangement of the level orderings. On the largest length scale of 2-3 fm, the spectrum agrees with that expected for string-like excitations. The energies nearly reproduce asymptotic pi/R string gaps, but exhibit a fine structure, providing important clues for developing an effective bosonic string description.
description: 4 pages, 3 figures, RevTeX4 (final version accepted for publication)
title: Reporting 2014 Technische Universität Braunschweig: Verwaltung und Stabsstellen, zentrale und übergreifende Einrichtungen, Carolo-Wilhelmina Forschungszentren
Creators: name: :None
Publisher: name: Technische Universität
Year: 2015
Subjects: subject: Technische Universität Braunschweig
subject: 379

description: Reporting Technische Universität Braunschweig: Verwaltung und Stabsstellen, zentrale und übergreifende Einrichtungen, Carolo-Wilhelmina Forschungszentren, vol. 2014
Transit Advertising with Alcohol and Violent Content on Public Platforms: A Descriptive Study of Advertisements Within the New York City Subway System
Creators: Fullwood, Marvin Dottington
Publisher: name: Columbia University
Year: 2018
Subjects: Public health education
Advertising--Transportation
Public policy (Law)
Advertising and youth
Advertising--Alcoholic beverages
Subway posters (Entertainment advertising)
Subways

description: Two of the most important behaviors affecting youth are alcohol use and aggression. Advertisements that promote alcohol consumption and display aggressive images and words may influence attitudes and behaviors of youth. While there is considerable research on these kinds of advertisements in various media channels, there is limited research describing such advertising within public transit systems. The purpose of this study was, therefore, to describe and prevalence and characteristics of advertisements about alcohol and with violent content on the platform walls of the New York City subway system.
      Methods: A cross-sectional design with direct observations was used to document all advertisements in four boroughs: Bronx, Brooklyn, Manhattan, and Queens. Subway stations with and without advertising were identified and selected characteristics of advertisements about alcohol and with violent content were described. The presence of advertisements was examined based on racial/ethnic and income characteristics of station location using logistic regression.
      Results: Of 472 subway stations observed, 143 contained 8,737 advertisements, including duplicates. Of the 143 stations with any type of advertisements, 76 (53.1%) displayed one or more alcohol advertisements while over 95% included one or more advertisements with violent content (136 of 143). Of the 8,737 advertisements observed, 129 (1.5%) were for alcohol (including three public service messages) and 1,154 (13.2%) had violent content. Almost two-thirds of the 129 advertisements about alcohol were for beer. There were 144 advertisements that pictured guns. Not one public service announcement for violence prevention was observed. Examination of the presence of advertisements based on racial/ethnic and income characteristics of station location (n = 454 with complete data) showed no differences for advertisements with violent content, but greater odds of alcohol advertisements being present in locations with a higher percentage of Black population. Considerable variability existed between neighborhoods within each borough.
      Conclusions: Almost 9,000 advertisements were documented in this study. Despite the low number of advertisements about alcohol, one or more such advertisements was present in over one-half of the stations with advertising. Advertisements with violent content were pervasive. Recommendations focus on how public transit spaces can be used more productively to help cultivate caring communities.
Path integral quantization of Yang-Mills theory
Creators: name: Muslih, Sami I.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Path integral formulation based on the canonical method is discussed. Path integral for Yang-Mills theory is obtained by this procedure. It is shown that gauge fixing which is essential procedure to quantize singular systems by Faddeev's and Popov's method is not necessary if the canonical path integral formulation is used.
description: 9 pages, latex, no fiqures
Transients from the Birth and Death of Compact Objects
Creators: Margalit, Ben
Publisher: name: Columbia University
Year: 2018
Subjects: Physics
Astrophysics
Compact objects (Astronomy)
Supernovae

description: Astrophysical compact objects --- white dwarfs (WDs), neutron stars (NSs), and stellar mass black holes (BHs) --- mark the endpoints of normal stellar evolution. Their birth is often associated with dramatic explosions known as core-collapse supernovae (SNe). Such SNe are archetypal ``transients'' --- astronomical events which produce detectable emission for only a limited period of time (measurable over human timescales). This dissertation investigates the astrophysical implications of the formation and destruction of compact objects with particular focus on the transient phenomena that may be produced in such events.
      Part I is devoted to the ``death'' of compact objects by their coalescence with a binary companion. Such compact object binaries are driven towards merger by the extraction of orbital energy in the form of gravitational-waves (GW), and are thus prime targets for current and future GW detectors. In the first two chapters of Part I we consider the merger of a WD with a NS companion, beginning with Chapter 2, in which we explore the nuclearly-reactive accretion flow produced in the aftermath of such mergers and the possible `SN-like' transient it may give rise to. We continue in Chapter 3 by proposing that the late-time evolution of this post-merger accretion disk may result in terrestrial planet formation, broadly consistent with the mysterious ``pulsar planets'' observed orbiting PSR B1257+12. We shift our attention in the next couple chapters of this first part of the dissertation to binary NS mergers. In Chapter 4 we address the question of disk formation in the aftermath of the collapse of a rigidly-rotating supramassive NS, which is directly applicable to various models of gamma-ray bursts (GRBs). In Chapter 5 we utilize both GW and electromagnetic signatures of the first observed NS merger GW170817 to place new constraints on the NS equation of state.
      Finally, in Part II of this dissertation, we explore the connection between transient phenomena ranging from long- and ultra-long- GRBs, to energetic super-luminous SNe (SLSNe) and fast radio bursts (FRB), and relate these to the ``birth'' of a rapidly rotating highly-magnetized NS, a millisecond ``magnetar''. In Chapter 6 we show that both jetted and thermal transients (namely a GRB and a SLSN) can be powered simultaneously by such magnetars, and explore the various observational implications of this connection. We end with Chapter 7 in which we study the photo-ionization of the medium surrounding a newly born magnetar, discussing the observational signatures related to the escape of this ionizing radiation. We additionally address the propagation of radio waves and the dispersion measure induced by such photo-ionization and apply these to show that FRBs are broadly consistent with having young magnetars as their progenitors.
Speed and Adaptability of Overlap Fermion Algorithms
Creators: name: Gavai, Rajiv V.
name: Gupta, Sourendu
name: Lacaze, Robert
Publisher: name: arXiv
Year: 2002
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We compare the efficiency of four different algorithms to compute the overlap Dirac operator, both for the speed, i.e., time required to reach a desired numerical accuracy, and for the adaptability, i.e., the scaling of speed with the condition number of the (square of the) Wilson Dirac operator. Although orthogonal polynomial expansions give good speeds at moderate condition number, they are highly non-adaptable. One of the rational function expansions, the Zolotarev approximation, is the fastest and is adaptable. The conjugate gradient approximation is adaptable, self-tuning, and nearly as fast as the ZA.
description: 30 Pages, 7 Figures, RevTex4, New results for Zolotarev Algorithm, causing major changes in Section V and Concluding section
Non-local conservation laws and flow equations for supersymmetric integrable hierarchies
Creators: name: Madsen, Jens Ole
name: Miramontes, J. Luis
Publisher: name: arXiv
Year: 1999
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: An infinite series of Grassmann-odd and Grassmann-even flow equations is defined for a class of supersymmetric integrable hierarchies associated with loop superalgebras. All these flows commute with the mutually commuting bosonic ones originally considered to define these hierarchies and, hence, provide extra fermionic and bosonic symmetries that include the built-in N=1 supersymmetry transformation. The corresponding non-local conserved quantities are also constructed. As an example, the particular case of the principal supersymmetric hierarchies associated with the affine superalgebras with a fermionic simple root system is discussed in detail.
description: 36 pages, LaTeX file
Additional file 1 of Comparative transcriptome analysis reveals different defence responses during the early stage of wounding stress in Chi-Nan germplasm and ordinary Aquilaria sinensis
Creators: name: Lv, Feifei
name: Yang, Yun
name: Sun, Peiwen
name: Zhang, Yan
name: Liu, Peiwei
name: Fan, Xiaohong
name: Xu, Yanhong
name: Wei, Jianhe
Publisher: name: figshare
Year: 2022
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Plant Biology

description: Additional file 1: Table S1. Primers used for quantitative RT-PCR. Table S2. Chemical composition and relative amounts of sesquiterpenoids from branches in two germplasm resources at 30 d after wounding stress. Table S3. Sequencing and mapping statistics for the 12 transcriptomes data. Table S4. Enriched KEGG pathways in two germplasm resources comparisons. Table S5. DEGs were enriched in KEGG pathways in green, turquoise and red modules.
Glazing in residential high rise buildings energy saving vs. the optimum day lighting
Creators: name: Akbarnejad, Mahsa
name: Babaie, Ashkan
Publisher: name: The University of British Columbia
Year: 2015

description: Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
Tourism in the Moreton Bay Region
Creators: name: Ruhanen, Lisa
name: Orams, Mark
name: Whitford, Michelle
Publisher: name: figshare
Year: 2019
Subjects: subject: 150699 Tourism not elsewhere classified
subject: FOS: Economics and business

description: Paper contribution to the Moreton Bay (Quandamooka) & Catchment eBook available on www.moretonbayfoundation.org.
Deep Levels and Mixed Conductivity in Organometallic Halide Perovskites
Creators: name: Musiienko, Artem
name: Moravec, Pavel
name: Grill, Roman
name: Praus, Petr
name: Vasylchenko, Igor
name: Pekarek, Jakub
name: Tisdale, Jeremy
name: Ridzonova, Katarina
name: Belas, Eduard
name: Abelova, Lucie
name: Hu, Bin
name: Lukosi, Eric
name: Ahmadi, Mahshid
Publisher: name: arXiv
Year: 2018
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Understanding the type, formation energy and capture cross section of defects is one of the challenges in the field of organometallic halide perovskite (OMHP) devices. Currently, such understanding is limited, restricting the power conversion efficiencies of OMHPs solar cells from reaching their Shockley Queisser limit. Here, we report on deep level (DL) defects and their effect on free charge transport properties of single crystalline methylammonium lead bromide perovskite (MAPB). In order to determine DL activation energy and capture cross section we used photo-Hall effect spectroscopy (PHES) with enhanced illumination in both steady-state and dynamic regimes. This method has shown to be convenient due to the direct DL visualization by sub-bandgap photo-excitation of trapped carriers. DLs with activation energies of 1.05 eV, 1.5 eV, and 1.9 eV above valence band were detected. The hole capture cross section was found using photoconductivity relaxation after sub-bandgap photo-excitation. We found the DL defects responsible for non-radiative recombination and its impact on band alignment for the first time. Additionally, the transport properties of MAPB single crystal is measured by Time of Flight (ToF) at several biases. The analysis of ToF measurement further confirms increase of Hall mobility and the enhancement of hole transport produced by sub-bandgap illumination in MAPB devices. Our studies provide a strong evidence on deep levels in OMHPs and opens a richer picture of the role and properties of deep levels in MAPB single crystals as a system model for the first time. The deeper knowledge of the electrical structure of OMHP could open further opportunities in the development of more feasible technology.
Additional file 2 of A comparison of methods for analysing compositional data with fixed and variable totals: a simulation study using the examples of time-use and dietary data
Creators: name: Tomova, Georgia D.
name: Walmsley, Rosemary
name: Berrie, Laurie
name: Morris, Michelle A.
name: Tennant, Peter W. G.
Publisher: name: figshare
Year: 2025
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Science Policy

description: Supplementary material 2. Table S1.
title: Resurrecting second harmonic generation (SHG) case study
Creators: name: Partridge, Matthew
name: Gow, Stephen
name: Doyle, Jack
name: Cruickshank, Don
name: Pearman-Kanza, Samantha
name: Frey, Jeremy G.
Publisher: name: University of Southampton
Year: 2025
Subjects: subject: Second Harmonic Generation, Case Study, PSDI, Databases

description: The preservation, accessibility, and reuse of scientific data are increasingly vital in contemporary research. Historical datasets, often termed legacy data, provide significant opportunities for new discoveries, validation of past results, and insights through modern analytical methods. Despite their potential value, legacy datasets frequently suffer from poor documentation, outdated formats, and technological obsolescence, complicating their reuse. This report addresses these challenges through the reconstruction of databases originating from Second Harmonic Generation (SHG) experiments, conducted as part of a doctoral research project completed in 2011 at the University of Southampton.
Complex inflaton field in quantum cosmology
Creators: name: Kamenshchik, A. Yu.
name: Khalatnikov, I. M.
name: Toporensky, A. V.
Publisher: name: arXiv
Year: 1998
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the cosmological model with the complex scalar self-interacting inflaton field non-minimally coupled to gravity. The different geometries of the Euclidean classically forbidden regions are represented. The instanton solutions of the corresponding Euclidean equations of motion are found by numerical calculations supplemented by the qualitative analysis of Lorentzian and Euclidean trajectories. The applications of these solutions to the no-boundary and tunneling proposals for the wave function of the Universe are studied. Possible interpretation of obtained results and their connection with inflationary cosmology is discussed. The restrictions on the possible values of the new quasi-fundamental constant of the theory-non-zero classical charge-- are obtained. The equations of motion for the generalized cosmological model with complex scalar field are written down and investigated. The conditions of the existence of instanton solutions corresponding to permanent values of an absolute value of scalar field are obtained.
description: 34 pages with 2 gif figures, mprocl.sty, To appear in International Journal of Modern Physics D
On the dimension of discrete valuations of k((X1,...,Xn))
Creators: name: Acosta, Miguel Angel Olalla
Publisher: name: arXiv
Year: 2000
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics

description: Let $v$ be a rank-one discrete valuation of the field $k((\X))$. We know, after \cite{Bri2}, that if $n=2$ then the dimension of $v$ is 1 and if $v$ is the usual order function over $k((\X))$ its dimension is $n-1$. In this paper we prove that, in the general case, the dimension of a rank-one discrete valuation can be any number between 1 and $n-1$.
description: 5 pages
Additional file 3 of A comparison of methods for analysing compositional data with fixed and variable totals: a simulation study using the examples of time-use and dietary data
Creators: name: Tomova, Georgia D.
name: Walmsley, Rosemary
name: Berrie, Laurie
name: Morris, Michelle A.
name: Tennant, Peter W. G.
Publisher: name: figshare
Year: 2025
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Science Policy

description: Supplementary material 3: Table S2.
Transit-Induced Urban Transformation: A Comparative Study of Tokyo and Hong Kong
Creators: Liu, Yudi
Publisher: name: Columbia University
Year: 2019
Subjects: City planning
Local transit
Local transit--Planning
Railroads
Land use, Urban

description: In recent years, scholars increasingly advocate for rail transit development due to its subsequent benefits for sustainable development. In East Asia, Hong Kong and Tokyo have both developed financially self-sufficient rail transit systems. (1). in what ways has the rail transit system directed the two cities’ urban expansion? and (2).in what ways have public sectors’ land use regulation and private sectors’ project financing support rail transit development? To answer these two research questions, this study applies a qualitative approach to explore and compare factors of success in the two cities. First, through literature and data, the analysis confirms that the rail transit-induced urban expansion is an achievement involving supportive planning systems, transit corridor formation strategies, transit hub promotion regulations, as well as project financing solutions. In comparison, the study finds that Hong Kong has a strong public sector-led approach for funding, developing, and using rail transit to promote achieving urban expansion goals. In Tokyo, private sectors, especially private rail firms, play a more active role in the city’ urban expansion for decades. Public entities provide a variety of planning instruments to support rail transit development and recently also started participating in project development.
Transit-Oriented Governance: A Comparison of the Impact of Regional Government Structures on Public Transit Use in Toronto and Vancouver
Creators: Schabas, Jacob M.
Publisher: name: Columbia University
Year: 2012
Subjects: Transportation--Planning
Municipal government
Urban transportation policy
Sustainable development

description: This thesis explores the relationship between regional government structures in the Toronto and Vancouver metropolitan areas and the development of comparatively high post-war transit use. While local government reforms and the impacts of regional development on transit use following World War II have received much attention in isolation, they have rarely been analyzed together. This paper investigates how the unique regional governance structures in Toronto and Vancouver allowed both cities to counter North American transportation trends by facilitating the creation of policies that favored transit use. By analyzing the historic operating and financial data from the transit agencies in both cities within the context of legislative reforms to local government and the resulting transportation policies, the impact of regional governance structures on transit use is examined. This paper finds that the success of transportation institutions in achieving high regional transit use is closely tied to the extent that local government bodies have fiscal autonomy, jurisdictional flexibility and involve local transit operating knowledge in transportation policy formation. Finally, the cases of Toronto and Vancouver suggest that the presence and long-term sustainability of these three capacities is inversely related to the involvement of senior government in local transportation planning.
CDM models with a BSI steplike primordial spectrum and a cosmological constant
Creators: name: Lesgourgues, J.
name: Polarski, D.
name: Starobinsky, A. A.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A class of spatially-flat models with cold dark matter (CDM), a cosmological constant and a broken-scale-invariant (BSI) steplike primordial (initial) spectrum of adiabatic perturbations, generated in an exactly solvable inflationary model where the inflaton potential has a rapid change of its first derivative at some point, is confronted with existing observational data on angular fluctuations of the CMB temperature, galaxy clustering and peculiar velocities of galaxies. If we locate the step in the initial spectrum at k=0.05 h/Mpc, where some feature in the spectrum of Abell clusters of galaxies was found that could reflect a property of the initial spectrum, and if the large scales flat plateau of the spectrum is normalized according to the COBE data, the only remaining parameter of the spectrum is p - the ratio of amplitudes of the metric perturbations between the small scales and large scales flat plateaux. Allowed regions in the plane of parameters (Omega=1-Omega_Lambda, H_0) satisfying all data have been found for p lying in the region (0.8-1.7). Especially good agreement of the form of the present power spectrum in this model with the form of the cluster power spectrum is obtained for the inverted step (p<1, p=0.7-0.8), when the initial spectrum has slightly more power on small scales.
description: 7 pages, 5 figures, LaTeX with mn.sty
Transit Funding; Why the Politics? A Comparative Study of Public Transportation Infrastructure Funding in New York City and Los Angeles
Creators: Huerta, Claudia P.
Publisher: name: Columbia University
Year: 2012
Subjects: Local transit--Finance
Urban transportation--Planning
Choice of transportation

description: Suburban sprawl and automobile dependence has undermined support and funding for mass transit in Los Angeles and New York, and has instead dedicated funding from gas tax revenues to highways. Infrastructure coalition building in Los Angeles is turning public need and support into dollars. The challenge is what can New York City learn from the soon to be ex-autopolis and what can Los Angeles learn from the funding transit legacy of New York. This thesis asks the questions of why there is more transit momentum in Los Angeles than in New York City, and what is making it easier to fund projects in a relatively conservative political environment. Points of similarity and divergence in transit funding in New York City and Los Angeles are be identified through critical review of the funding strategies of the two systems. Interestingly, though these two cities have historically pursued transit in inversely opposite manners; the newfound transit religion in Los Angeles is currently juxtaposed with what seems to be stagnate growth in New York. The impetus and values driving the grassroots coalition in Los Angeles are strengthening political support and helping secure financing for transit projects, and points to the importance of champions in securing funding for transit.
Education in Quandamooka – A long and evolving tradition
Creators: name: Casey, Emily
name: Roe, Timothy
name: Tibbetts, Ian
name: Aylward, Dianne
Publisher: name: figshare
Year: 2019
Subjects: subject: 50203 Environmental Education and Extension
subject: FOS: Earth and related environmental sciences

description: Paper contribution to the Moreton Bay (Quandamooka) & Catchment eBook available on www.moretonbayfoundation.org.
Transition Metal Hydrides that Mediate Catalytic Hydrogen Atom Transfers
Creators: Estes, Deven Paul
Publisher: name: Columbia University
Year: 2014
Subjects: Chemistry, Inorganic
Chemistry, Organic

description: Radical cyclizations are important reactions in organic chemistry. However, they are seldom used industrially due to their reliance on neurotoxic trialkyltin hydride. Many substitutes for tin hydrides have been developed but none have provided a general solution to the problem.
      	Transition metal hydrides with weak M-H bonds can generate carbon centered radicals by hydrogen atom transfer (HAT) to olefins. This metal to olefin hydrogen atom transfer (MOHAT) reaction has been postulated as the initial step in many hydrogenation and hydroformylation reactions. The Norton group has shown MOHAT can mediate radical cyclizations of ɑ,ω dienes to form five and six membered rings. The reaction can be done catalytically if 1) the product metalloradical reacts with hydrogen gas to reform the hydride and 2) the hydride can perform MOHAT reactions. The Norton group has shown that both CpCr(CO)₃H and Co(dmgBF₂)₂(H₂O)₂ can catalyze radical cyclizations. However, both have significant draw backs.
      	In an effort to improve the catalytic efficiency of these reactions we have studied several potential catalyst candidates to test their viability as radical cyclization catalysts. I investigate the hydride CpFe(CO)₂H (FpH). FpH has been shown to transfer hydrogen atoms to dienes and styrenes. I measured the Fe-H bond dissociation free energy (BDFE) to be 63 kcal/mol (much higher than previously thought) and showed that this hydride is not a good candidate for catalytic radical cyclizations.
      	I have investigated the dynamics of Co(dmgBF₂)₂(H₂O)₂ under hydrogen gas to attempt to observe its hypothesized cobalt hydride. Under large pressures up to 70 atm we see two species one which we assign as the cobalt hydride and one which we assign as a ligand protonated Co(I) complex. These are supported by high pressure NMR studies of the same complexes. By varying the H₂ pressure, we can calculate the hydrogen atom donor ability of the mixture formed under H₂ as 50 kcal/mol. This makes this mixture a very good H• donor.
      	The Norton group has shown that vanadium hydrides have very weak V-H bonds that donate H* rapidly. However, they cannot be made catalytic under hydrogen gas. I have attempted to regenerate these vanadium hydrides by a sequential reduction then protonation of the metalloradical. With HV(CO)₄dppe this only produced hydrogen gas, presumably by one electron reduction of HV(CO)₄dppe. However, with HV(CO)₄dppf this does not readily occur and this hydride could potentially be a catalyst for radical cyclizations.
      	Many radical cyclizations involve vinyl (sp²) radicals. I have shown that both the CpCr(CO)₃H and the Co(dmgBF₂)₂(H₂O)₂ systems can catalytically perform metal to alkyne hydrogen atom transfers (MAHAT's) and that these reactions can be used to perform radical cyclizations very efficiently.
The staggered domain wall fermion method
Creators: name: Fleming, George T.
name: Vranas, Pavlos M.
Publisher: name: arXiv
Year: 2002
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: A different lattice fermion method is introduced. Staggered domain wall fermions are defined in 2n+1 dimensions and describe 2^n flavors of light lattice fermions with exact U(1) x U(1) chiral symmetry in 2n dimensions. As the size of the extra dimension becomes large, 2^n chiral flavors with the same chiral charge are expected to be localized on each boundary and the full SU(2^n) x SU(2^n) flavor chiral symmetry is expected to be recovered. SDWF give a different perspective into the inherent flavor mixing of lattice fermions and by design present an advantage for numerical simulations of lattice QCD thermodynamics. The chiral and topological index properties of the SDWF Dirac operator are investigated. And, there is a surprise ending...
description: revtex4, 7 figures, minor revisions, 2 references added
Estimation By The Analogy Principle
Creators: name: Manski, Charles F.
name: Manski, Charles F.
Publisher: name: Unknown
Year: 1986
Subjects: Research Methods/ Statistical Methods

description: The analogy principle proposes that population parameters be estimated by sample statistics which make known properties of the population hold as closely as possible in the sample. Applications of the analogy principle are ubiquitous. Nevertheless, estimation theory has not been studied from a consistent analog perspective. This paper makes a start.
Nonintrinsic origin of the magnetic-field-induced metal-insulator and electronic phase transitions in graphite
Creators: name: Barzola-Quiquia, José
name: Esquinazi, Pablo D.
name: Precker, Christian E.
name: Stiller, Markus
name: Zoraghi, Mahsa
name: Förster, Tobias
name: Herrmannsdörfer, Thomas
name: Coniglio, William A.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A detailed magnetoresistance study of bulk and microflake samples of highly oriented pyrolytic graphite with a thickness of 25 $μ$m to 23~nm reveals that the usually observed field-induced metal-insulator and electronic phase transitions vanish in thinner samples. The observed suppression is accompanied by orders of magnitude decrease of the magnetoresistance and of the amplitude of the Shubnikov-de-Haas oscillations. The overall behavior is related to the decrease in the quantity of two-dimensional interfaces between crystalline regions of the same and different stacking orders present in graphite samples. Our results indicate that these field-induced transitions are not intrinsic to the ideal graphite structure and, therefore, a relevant portion of the published interpretations should be reconsidered.
description: 12 pages, 15 figures