cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Middle Miocene Climate and Stable Oxygen Isotopes in Europe Based on Numerical Modeling
Creators: name: Botsyun, Svetlana
name: Ehlers, Todd A.
name: Koptev, Alexander
name: Böhme, Madelaine
name: Methner, Katharina
name: Risi, Camille
name: Stepanek, Christian
name: Mutz, Sebastian G.
name: Werner, Martin
name: Boateng, Daniel
Publisher: name: Freie Universität Berlin
Year: 2022
Subjects: subject: Europe
subject: Middle Miocene
subject: climate modeling
subject: stable water isotopes
subject: temperature
subject: precipitation
subject: paleoclimate
subject: paleoelevation
subject: Alps
subject: 500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::551 Geologie, Hydrologie, Meteorologie

description: The Middle Miocene (15.99–11.65 Ma) of Europe witnessed major climatic, environmental, and vegetational change, yet we are lacking detailed reconstructions of Middle Miocene temperature and precipitation patterns over Europe. Here, we use a high-resolution (∼0.75°) isotope-enabled general circulation model (ECHAM5-wiso) with time-specific boundary conditions to investigate changes in temperature, precipitation, and δ18O in precipitation (δ18Op). Experiments were designed with variable elevation configurations of the European Alps and different atmospheric CO2 levels to examine the influence of Alpine elevation and global climate forcing on regional climate and δ18Op patterns. Modeling results are in agreement with available paleobotanical temperature data and with low-resolution Middle Miocene experiments of the Miocene Model Intercomparison Project (MioMIP1). However, simulated precipitation rates are 300–500 mm/yr lower in the Middle Miocene than for pre-industrial times for central Europe. This result is consistent with precipitation estimates from herpetological fossil assemblages, but contradicts precipitation estimates from paleobotanical data. We attribute the Middle Miocene precipitation change in Europe to shifts in large-scale pressure patterns in the North Atlantic and over Europe and associated changes in wind direction and humidity. We suggest that global climate forcing contributed to a maximum δ18Op change of ∼2‰ over high elevation (Alps) and ∼1‰ over low elevation regions. In contrast, we observe a maximum modeled δ18Op decrease of 8‰ across the Alpine orogen due to Alpine topography. However, the elevation-δ18Op lapse rate shallows in the Middle Miocene, leading to a possible underestimation of paleotopography when using present-day δ18Op—elevation relationships data for stable isotope paleoaltimetry studies.
Constructions for the optimal pebbling of grids
Creators: name: Győri, Ervin
name: Katona, Gyula Y.
name: Papp, László F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C57

description: In [C. Xue, C. Yerger: Optimal Pebbling on Grids, Graphs and Combinatorics] the authors conjecture that if every vertex of an infinite square grid is reachable from a pebble distribution, then the covering ratio of this distribution is at most $3.25$. First we present such a distribution with covering ratio $3.5$, disproving the conjecture. The authors in the above paper also claim to prove that the covering ratio of any pebble distribution is at most $6.75$. The proof contains some errors. We present a few interesting pebble distributions that this proof does not seem to cover and highlight some other difficulties of this topic.
A Usability Study of Flash Tutorials for Library Instruction
Creators: name: Petit, Joan A.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2006
Subjects: College and university libraries
Flash Media
Usability testing
University of North Carolina at Chapel Hill
Library Instruction--Web-based Instruction

description: This study presents the results of a usability test of animated library instruction tutorials developed in Flash using the software Macromedia Captivate. The tutorials demonstrated title searching, author searching, and keyword searching in the University of North Carolina at Chapel Hill University Libraries OPAC. Five participants viewed three tutorials and completed two surveys, one with demographic questions, the other with questions about the design and function of the tutorials. The results suggest that the tutorials are usable in design and function, and all participants reported learning something about searching the OPAC. However, the participants also reported finding the tutorials boring and expressed skepticism that undergraduate students would recognize the advantages of using a search instruction tutorial.
A dynamical system analysis of hybrid metric-Palatini cosmologies
Creators: name: Carloni, Sante
name: Koivisto, Tomi
name: Lobo, Francisco S. N.
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The so called $f(X)$ hybrid metric-Palatini gravity presents a unique viable generalisation of the $f(R)$ theories within the metric-affine formalism. Here the cosmology of the $f(X)$ theories is studied using the dynamical system approach. The method consists of formulating the propagation equation in terms of suitable (expansion-normalised) variables as an autonomous system. The fixed points of the system then represent exact cosmological solutions described by power-law or de Sitter expansion. The formalism is applied to two classes of $f(X)$ models, revealing both standard cosmological fixed points and new accelerating solutions that can be attractors in the phase space. In addition, the fixed point with vanishing expansion rate are considered with special care in order to characterise the stability of Einstein static spaces and bouncing solutions.
description: 13 pages
Parameter uncertainty in forecast recalibration
Creators: name: Siegert, Stefan
name: Sansom, Philip G.
name: Williams, Robin
Publisher: name: arXiv
Year: 2015
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Ensemble forecasts of weather and climate are subject to systematic biases in the ensemble mean and variance, leading to inaccurate estimates of the forecast mean and variance. To address these biases, ensemble forecasts are post-processed using statistical recalibration frameworks. These frameworks often specify parametric probability distributions for the verifying observations. A common choice is the Normal distribution with mean and variance specified by linear functions of the ensemble mean and variance. The parameters of the recalibration framework are estimated from historical archives of forecasts and verifying observations. Often there are relatively few forecasts and observations available for parameter estimation, and so the fitted parameters are also subject to uncertainty. This artefact is usually ignored. This study reviews analytic results that account for parameter uncertainty in the widely used Model Output Statistics recalibration framework. The predictive bootstrap is used to approximate the parameter uncertainty by resampling in more general frameworks such as Non-homogeneous Gaussian Regression. Forecasts on daily, seasonal and annual time scales are used to demonstrate that accounting for parameter uncertainty in the recalibrated predictive distributions leads to probability forecasts that are more skilful and reliable than those in which parameter uncertainty is ignored. The improvements are attributed to more reliable tail probabilities of the recalibrated forecast distributions.
description: 22 pages, 9 figures
SU(4) Symmetry Breaking and Induced Superconductivity in Graphene Quantum Hall Edges
Creators: name: Cuozzo, Joseph J.
name: Rossi, Enrico
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In graphene, the approximate SU(4) symmetry associated with the spin and valley degrees of freedom in the quantum Hall (QH) regime is reflected in the 4-fold degeneracy of graphene's Landau levels (LL's). Interactions and the Zeeman effect break such approximate symmetry and lift the corresponding degeneracy of the LLs. We study how the breaking of the approximate SU(4) symmetry affects the properties of graphene's QH edge modes located in proximity to a superconductor. We show how the lifting of the 4-fold degeneracy qualitatively modifies the transport properties of the QH-superconductor heterojunction. For the zero LL, by placing the edge modes in proximity to a superconductor, it is in principle possible to realize a 1D topological superconductor supporting Majoranas in the presence of sufficiently strong Zeeman field. We estimate the topological gap of such a topological superconductor and relate it to the properties of the QH-superconductor interface.
description: 12 pages, 7 figures
How much is too much? A Case Study to Determine Whether the Cost of Book Loss at the Geology Library at the University of North Carolina at Chapel Hill is Greater than the Cost of an Electronic Security System
Creators: name: Stewart, Jennifer
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1999
Subjects: College and university libraries
Library Security Systems
Thefts and Losses of Books

description: Book loss is a major concern among many academic libraries.  This case study describes the cost of book loss at the Geology Library at the University of North Carolina at Chapel Hill.  It compares those costs, both tangible and intangible, to the costs and benefits of an electronic security system.  Alternatives to an electronic security system are also discussed.
N=4 super-Yang-Mills in LHC superspace. Part I: Classical and quantum theory
Creators: name: Chicherin, Dmitry
name: Sokatchev, Emery
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a formulation of the maximally supersymmetric N=4 gauge theory in Lorentz harmonic chiral (LHC) superspace. It is closely related to the twistor formulation of the theory but employs the simpler notion of Lorentz harmonic variables. They parametrize a two-sphere and allow us to handle efficiently infinite towers of higher-spin auxiliary fields defined on ordinary space-time. In this approach the chiral half of N=4 supersymmetry is manifest. The other half is realized non-linearly and the algebra closes on shell. We give a straightforward derivation of the Feynman rules in coordinate space. We show that the LHC formulation of the N=4 super-Yang-Mills theory is remarkably similar to the harmonic superspace formulation of the N=2 gauge and hypermultiplet matter theories. In the twin paper arXiv:1601.06804 we apply the LHC formalism to the study of the non-chiral multipoint correlation functions of the N=4 stress-tensor supermultiplet.
description: 51 pages, 4 figures; v2: Appendix B on the propagators in momentum space added. A more detailed comparison with the twistor approach given in Appendix C
Spontaneous symmetry breaking, and strings defects in hypercomplex gauge field theories
Creators: name: Cartas-Fuentevilla, R.
name: Meza-Aldama, O.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Inspired by the appearance of split-complex structures in the dimensional reduction of string theory, and in the theories emerging as byproducts, we study the hyper-complex formulation of Abelian gauge field theories, by incorporating a new complex unit to the usual complex one. The hypercomplex version of the traditional Mexican hat potential associated with the $U(1)$ gauge field theory, corresponds to a {\it hybrid} potential with two real components, and with $U(1)\times SO(1,1)$ as symmetry group. Each component corresponds to a deformation of the hat potential, with the appearance of a new degenerate vacuum. Hypercomplex electrodynamics will show novel properties, such as the spontaneous symmetry breaking scenarios with running masses for the vectorial and scalar Higgs fields, and the Aharonov-Bohm type strings defects as exact solutions; these topological defects may be detected only by quantum interference of charged particles through gauge invariant loop integrals. In a particular limit, the {\it hyperbolic} electrodynamics does not admit topological defects associated with continuous symmetries
description: 40 pages
TOURISM DEVELOPMENT: AN OVERVIEWOFMICRO-LOGISTICS IN CHIANG MAI, THAILAND
Creators: name: Morelos, Grace
Publisher: name: มหาวิทยาลัยราชภัฏกาญจนบุรี
Year: 2558
Subjects: Chiang Mai
tourism

description: วารสารวิชาการมหาวิทยาลัยราชภัฏกาญจนบุรี, 4, 2, 5
Concert Event Metadata: Describing Concerts Effectively in a Digital Environment
Creators: name: Graves, Michael J.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2003
Subjects: Web Ontology Language
Metadata
Resource Description Framework
Music Ontologies

description: This research describes the creation of an ontology for web distribution of concert event information. A literature review provides a survey of current methods of encoding concert event metadata on the Web. The generation of sample records using these current standards highlights their strengths and limitations. Through an analysis of printed flyers and newspaper advertisements in the Chapel Hill area, a proposed metadata ontology is generated as an improvement over existing solutions. A prototype web database that would allow local musicians to inform the community of upcoming concerts is created as an example of how this ontology could be implemented.
N=4 super-Yang-Mills in LHC superspace. Part II: Non-chiral correlation functions of the stress-tensor multiplet
Creators: name: Chicherin, Dmitry
name: Sokatchev, Emery
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the multipoint super-correlation functions of the full non-chiral stress-tensor multiplet in N=4 super-Yang-Mills theory in the Born approximation. We derive effective supergraph Feynman rules for them. Surprisingly, the Feynman rules for the non-chiral correlators are obtained from those for the chiral correlators by a simple Grassmann shift of the space-time variables. We rely on the formulation of the theory in Lorentz harmonic chiral (LHC) superspace elaborated in the twin paper arXiv:1601.06803. In this approach only the chiral half of the supersymmetry is manifest. The other half is realized by nonlinear and nonlocal transformations of the LHC superfields. However, at Born level only the simple linear part of the transformations is relevant. It corresponds to effectively working in the self-dual sector of the theory. Our method is also applicable to a wider class of supermultiplets like all the half-BPS operators and the Konishi multiplet.
description: 66 pages, 16 figures; v2: Appendix F on the quantization in a Lorentz-covariant gauge added
Together Making Digital Footprints: Public Record Archivists and Genealogists in the Age of Ancestry.com
Creators: name: McCray, Kimberly L.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2012
Subjects: Genealogy
Archives--State
Archival materials--Digitization
Public records
Information needs

description: Genealogy's popularity is booming. Yet the public record repositories that support genealogists' research have seen significant decreases in in-person patrons over the past twelve years.  This paper examines the link between the widespread use of online genealogy databases and the drop in visitorship to public record repositories through qualitative feedback from interviews with professional genealogists and state archive employees.     This study also discusses the relationship between archivists and genealogists and offers suggestions as to how archivists can better serve genealogists and recoup lost visitation numbers through enhancing archival websites and digital collections.
พฤติกรรมการเล่นพนันของเด็กและเยาวชนในเขตกรุงเทพมหานคร
Creators: name: กิตติวงค์  สาสวด
Publisher: name: มหาวิทยาลัยราชภัฏกาญจนบุรี
Year: 2558
Subjects: ปัจจัยที่ส่งผลต่อการเล่นพนันพฤติกรรมการเล่นพนันผลกระทบต่อการเล่นพนัน

description: วารสารวิชาการมหาวิทยาลัยราชภัฏกาญจนบุรี, 4, 2, 54
Online learning for robust voltage control under uncertain grid topology
Creators: name: Yeh, Christopher
name: Yu, Jing
name: Shi, Yuanyuan
name: Wierman, Adam
Publisher: name: arXiv
Year: 2023
Subjects: subject: Systems and Control (eess.SY)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: Voltage control generally requires accurate information about the grid's topology in order to guarantee network stability. However, accurate topology identification is challenging for existing methods, especially as the grid is subject to increasingly frequent reconfiguration due to the adoption of renewable energy. In this work, we combine a nested convex body chasing algorithm with a robust predictive controller to achieve provably finite-time convergence to safe voltage limits in the online setting where there is uncertainty in both the network topology as well as load and generation variations. In an online fashion, our algorithm narrows down the set of possible grid models that are consistent with observations and adjusts reactive power generation accordingly to keep voltages within desired safety limits. Our approach can also incorporate existing partial knowledge of the network to improve voltage control performance. We demonstrate the effectiveness of our approach in a case study on a Southern California Edison 56-bus distribution system. Our experiments show that in practical settings, the controller is indeed able to narrow the set of consistent topologies quickly enough to make control decisions that ensure stability in both linearized and realistic non-linear models of the distribution grid.
description: Published in IEEE Transactions on Smart Grid, vol. 15, no. 5, pp. 4754-4764, Sept. 2024. arXiv admin note: substantial text overlap with arXiv:2206.14369
การตัดสินใจเดินทางท่องเที่ยวของนักท่องเที่ยวในจังหวัดเชียงใหม่ผ่านการสื่อสาร บนเครือข่ายสังคมออนไลน์ประเภทเฟซบุ๊ค
Creators: name: เพียงอัปสร  ยาปาน
Publisher: name: มหาวิทยาลัยราชภัฏกาญจนบุรี
Year: 2558
Subjects: การสื่อสาร
เครือข่ายสังคมออนไลน์
กระบวนการตัดสินใจซื้อ

description: วารสารวิชาการมหาวิทยาลัยราชภัฏกาญจนบุรี, 4, 2, 24
ความสัมพันธ์ระหว่างนโยบายการบริหารจัดการทรัพยากรมนุษย์สายวิชาการกับผลการปฏิบัติงานของทรัพยากรมนุษย์สายวิชาการในมหาวิทยาลัยราชภัฏ
Creators: name: ชฎาพร   โพคัยสวรรค์
Publisher: name: มหาวิทยาลัยราชภัฏกาญจนบุรี
Year: 2558
Subjects: นโยบายการบริหารจัดการทรัพยากรมนุษย์สายวิชาการ
ผลการปฏิบัติงาน
มหาวิทยาลัยราชภัฏ

description: วารสารวิชาการมหาวิทยาลัยราชภัฏกาญจนบุรี, 4, 2, 43
The Effect of Social Proof on Tag Selection in Social Bookmarking Applications
Creators: name: Binkowski, Philip J.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2006
Subjects: Categorization--Psychology
Collaboration
Social Psycholoty
Deans Achievement Award--Best Masters Papers Awarded 2007
World Wide Web--Bookmarks
Indexing

description: The growing popularity of social bookmaking applications like flickr and del.icio.us present new challenges to system designers because the effects of social psychological factors on users' tag choices have not been examined. The social psychological principle of social proof is particularly applicable to social bookmarking because it predicts that the tags applied by users will be more similar to each other if they are provided with a list of suggested tags. This study examines the effect of social proof on tag selection by comparing the degree of similarity between tags provided by a sample group and a collection of suggested tags provided to the treatment group. The results indicate that social proof can have an effect on users' tag selection. The conclusion briefly examines the beneficial effect of social proof on the quality of social bookmarking applications and other collaborative tagging applications.
ปัญหาและอุปสรรคในการจัดทำบัญชีเงินกองทุนหมู่บ้านในเขตอำเภอเมือง จังหวัดพิษณุโลก
Creators: name: บุรพร  กำบุญ
Publisher: name: มหาวิทยาลัยราชภัฏกาญจนบุรี
Year: 2558
Subjects: ปัญหาและอุปสรรค
บัญชีเงินกองทุนหมู่บ้าน

description: วารสารวิชาการมหาวิทยาลัยราชภัฏกาญจนบุรี, 4, 2, 67
Neutron investigation of the magnetic scattering in an iron-based ferromagnetic superconductor
Creators: name: Lynn, Jeffrey W.
name: Zhou, Xiuquan
name: Borg, Christopher K. H.
name: Saha, Shanta R.
name: Paglione, Johnpierre
name: Rodriguez, Efrain E.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Neutron diffraction and small angle scattering experiments have been carried out on the double-isotopic polycrystalline sample (7Li0.82Fe0.18OD)FeSe. Profile refinements of the diffraction data establish the composition and reveal an essentially single phase material with lattice parameters of a= 3.7827 Å and c= 9.1277 Å at 4 K, in the ferromagnetic-superconductor regime, with a bulk superconducting transition of TC = 18 K. Small angle neutron scattering (SANS) measurements in zero applied field reveal the onset of ferromagnetic order below TF ~ 12.5 K, with a wave vector and temperature dependence consistent with an inhomogeneous ferromagnet of spontaneous vortices or domains in a mixed state. No oscillatory long range ordered magnetic state is observed. Field dependent measurements establish a separate component of magnetic scattering from the vortex lattice, which occurs at the expected wave vector. The temperature dependence of the vortex scattering does not indicate any contribution from the ferromagnetism, consistent with diffraction data that indicate that the ordered ferromagnetic moment is quite small.
description: 10 pages, 4 figures
Solanum americanum Mill.
Creators: name: MONRO, A. K.
name: SANTAMARÍA-AGUILAR, D.
name: GONZÁLEZ, F.
name: CHACÓN, O.
name: SOLANO, D.
name: RODRÍGUEZ, A.
name: ZAMORA, N.
name: FEDELE, E.
name: CORREA, M.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Solanales
Solanaceae
Solanum
Solanum americanum

description: Solanum americanum Mill.
Yerba mora (CR).
 Terrestrial herbs. Distribution in PILA 0–3000 m, low elevation mixed forest, mixed forest in transition to low elevation forest, mixed forest in transition to cloud forest, cloud forest, low elevation oak forest, high elevation oak forest. Global distribution: USA to Argentina, Lesser Antilles, Greater Antilles, Europe. Records: D. Solano 4286 (BM, INB, MO, PMA), E. Alfaro 3987 (INB), G. Davidse 23993 (CR, MO), G. Davidse 25141 (CR, MO), G. Davidse 29109 (CR, MO). Uses: Edible, medicinal, Tóxico.
description: Published as part of MONRO, A. K., SANTAMARÍA-AGUILAR, D., GONZÁLEZ, F., CHACÓN, O., SOLANO, D., RODRÍGUEZ, A., ZAMORA, N., FEDELE, E. & CORREA, M., 2017, A first checklist to the vascular plants of La Amistad International Park (PILA), Costa Rica-Panama, pp. 448-450 in Phytotaxa 322 (1) on pages 448-450, DOI: 10.11646/phytotaxa.322.1.1, http://zenodo.org/record/13698397
รูปแบบการท่องเที่ยวเชิงส่งเสริมสุขภาพสำหรับชาวต่างชาติที่มาท่องเที่ยวในประเทศไทย
Creators: name: สิริกร เลิศลัคธนาธาร
Publisher: name: มหาวิทยาลัยราชภัฏกาญจนบุรี
Year: 2559
Subjects: ปัจจัย
การท่องเที่ยว
รูปแบบการท่องเที่ยวเชิงส่งเสริมสุขภาพ

description: วารสารวิชาการมหาวิทยาลัยราชภัฏกาญจนบุรี, 5, 1, 4
เส้นทางสุ่นักท่องเที่ยวจีน : การปรับตัวของช่องทางการสื่อสารในยุค social media ครองเมือง
Creators: name: ปาลิดา ศรีศรกำพล
Publisher: name: มหาวิทยาลัยราชภัฏกาญจนบุรี
Year: 2559
Subjects: ปัจจัย
การท่องเที่ยว
รูปแบบการท่องเที่ยวเชิงส่งเสริมสุขภาพ

description: วารสารวิชาการมหาวิทยาลัยราชภัฏกาญจนบุรี, 5, 1, 27
title: Circular Economy – Ein Schlüssel für eine Nachhaltige Soziale  Marktwirtschaft?
Creators: name: García Schmidt, Armando
name: Holzmann, Sara
name: Petersen, Thieß
name: Wortmann, Marcus
Publisher: name: Bertelsmann Stiftung
Year: 2023
Subjects: subject: Zirkuläre Wirtschaft
subject: Nachhaltigkeit
subject: Ökologische Transformation

description: Entnehmen, Verwerten und Entsorgen. Von dieser linearen Logik unseres Wirtschaftens auf das Konzept einer zirkulären Wirtschaft (Circular Economy) umzustellen, verspricht viele ökologische Vorteile. Wenn einmal hergestellte Produkte länger genutzt, stärker geteilt und viele Stoffe am Ende der Lebensdauer zurück in den Kreislauf geführt werden, dann verbrauchen wir insgesamt weniger natürliche Ressourcen, emittieren weniger Treibhausgase und bremsen damit die Umweltzerstörung. Boden-, Luft- und Wasserqualität nehmen zu, die Biodiversität wird geschützt.
Im Fokuspapier „Circular Economy – Ein Schlüssel für eine Nachhaltige Soziale Marktwirtschaft?“ beleuchten wir, wie sich das Wirtschaftsmodell der Circular Economy grundsätzlich mit den Zielen und Prinzipien einer Nachhaltigen Sozialen Marktwirtschaft verträgt und wie weit wir bisher auf dem Weg gekommen sind.
Special Collections and Social Media: A Study of Two North Carolina Collections
Creators: name: Repp, Katherine-Rose
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010
Subjects: Special Collections--Marketing
Photograph collections
Marketing--Social media marketing
Libraries--Information technology
Web 2.0--Library applications

description: Special collections staff are duty-bound to promote their collections and ensure continued access. The challenge of the digital age is that many would-be patrons now assume that "everything is on the Internet," and they do not pursue non-digital resources. Special collections staff can meet this challenge through the use of social media tools. This paper examines what tasks these tools can accomplish, and how they are used successfully by two specific collections. These collections' usage of social media was evaluated through semi-structured interviews with staff, informed by analysis of their websites and use of commercial social media sites. This research finds that each collection used tools differently, and was most successful in promoting and providing access to their collections when they kept their audience's needs in mind. From this study, other special collections staff will learn how to successfully approach the use of these tools for their own collections.
Improving Automatic Parallel Training via Balanced Memory Workload Optimization
Creators: name: Wang, Yujie
name: Jiang, Youhe
name: Miao, Xupeng
name: Fu, Fangcheng
name: Zhu, Shenhan
name: Nie, Xiaonan
name: Tu, Yaofeng
name: Cui, Bin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Databases (cs.DB)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Transformer models have emerged as the leading approach for achieving state-of-the-art performance across various application domains, serving as the foundation for advanced large-scale deep learning (DL) models. However, efficiently training these models across multiple GPUs remains a complex challenge due to the abundance of parallelism options. Existing DL systems either require manual efforts to design distributed training plans or limit parallelism combinations to a constrained search space. In this paper, we present Galvatron-BMW, a novel system framework that integrates multiple prevalent parallelism dimensions and automatically identifies the most efficient hybrid parallelism strategy. To effectively navigate this vast search space, we employ a decision tree approach for decomposition and pruning based on intuitive insights. We further utilize a dynamic programming search algorithm to derive the optimal plan. Moreover, to improve resource utilization and enhance system efficiency, we propose a bi-objective optimization workflow that focuses on workload balance. Our evaluations on different Transformer models demonstrate the capabilities of Galvatron-BMW in automating distributed training under varying GPU memory constraints. Across all tested scenarios, Galvatron-BMW consistently achieves superior system throughput, surpassing previous approaches that rely on limited parallelism strategies.
description: arXiv admin note: substantial text overlap with arXiv:2211.13878
STCSNN: High energy efficiency spike-train level spiking neural networks with spatio-temporal conversion
Creators: name: Xu, Changqing
name: Liu, Yi
name: Yang, Yintang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: Brain-inspired spiking neuron networks (SNNs) have attracted widespread research interest due to their low power features, high biological plausibility, and strong spatiotemporal information processing capability. Although adopting a surrogate gradient (SG) makes the non-differentiability SNN trainable, achieving comparable accuracy for ANNs and keeping low-power features simultaneously is still tricky. In this paper, we proposed an energy-efficient spike-train level spiking neural network with spatio-temporal conversion, which has low computational cost and high accuracy. In the STCSNN, spatio-temporal conversion blocks (STCBs) are proposed to keep the low power features of SNNs and improve accuracy. However, STCSNN cannot adopt backpropagation algorithms directly due to the non-differentiability nature of spike trains. We proposed a suitable learning rule for STCSNNs by deducing the equivalent gradient of STCB. We evaluate the proposed STCSNN on static and neuromorphic datasets, including Fashion-Mnist, Cifar10, Cifar100, TinyImageNet, and DVS-Cifar10. The experiment results show that our proposed STCSNN outperforms the state-of-the-art accuracy on nearly all datasets, using fewer time steps and being highly energy-efficient.
description: Accepted by Neurocomputing on 10 August 2024
Virtual mitigation of coherent non-adiabatic transitions by echo verification
Creators: name: Schiffer, Benjamin F.
name: van Vreumingen, Dyon
name: Tura, Jordi
name: Polla, Stefano
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Transitions out of the ground space limit the performance of quantum adiabatic algorithms, while hardware imperfections impose stringent limitations on the circuit depth. We propose an adiabatic echo verification protocol which mitigates both coherent and incoherent errors, arising from non-adiabatic transitions and hardware noise, respectively. Quasi-adiabatically evolving forward and backwards allows for an echo-verified measurement of any observable. In addition to mitigating hardware noise, our method uses positive-time dynamics only. Crucially, the estimator bias of the observable is reduced when compared to standard adiabatic preparation, achieving up to a quadratic improvement.
description: 8+6 pages, 3+1 figures, accepted version
Differences in Productivity with Scrum and Kanban: A Comparative Study
Creators: name: Salkoski, Rasim
name: Shikoski, Blagoj
name: Kanevche, Jovan
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 460901
subject: Business process management
classificationCode: 460902
subject: Decision support and group support systems
classificationCode: 460903
subject: Information modelling, management and ontologies
classificationCode: 460904
subject: Information security management
classificationCode: 460905
subject: Information systems development methodologies and practice
classificationCode: 460906
subject: Information systems education
classificationCode: 460907
subject: Information systems for sustainable development and the public good

description: This research paper investigates the productivity differences between Scrum and Kanban, twowidely adopted Agile methodologies in software development. The study examines projectcompletion rates, team satisfaction, and overall productivity to determine the effectiveness of Scrumand Kanban. Data was collected through a comprehensive literature review, analysis of the 15thAnnual State of Agile Report, case studies, interviews, and expert opinions. The data analysisinvolved the use of descriptive statistics, inferential statistics, and qualitative analysis techniques toprovide a comprehensive understanding of the productivity differences between the twomethodologies. By offering insights into the factors contributing to the productivity differencesbetween Scrum and Kanban, this paper provides valuable guidance for organizations looking tooptimize their software development processes by choosing the most appropriate Agilemethodology for their projects
Holographic Flows in non-Abelian T-dual Geometries
Creators: name: Macpherson, Niall T.
name: Nunez, Carlos
name: Thompson, Daniel C.
name: Zacarias, S.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We use non-Abelian T-duality to construct new N=1 solutions of type IIA supergravity (and their M-theory lifts) that interpolate between AdS_5 geometries. We initiate a study of the holographic interpretation of these backgrounds as RG flows between conformal fixed points. Along the way we give an elegant formulation of non-Abelian T-duality when acting on a wide class of backgrounds, including those corresponding to such flows, in terms of their SU(2) structure.
description: 28 pages plus appendixes. Version to appear in JHEP
Advocacy on the Web: An Evaluation of a Nonprofit Advocacy Organization's Use of the Web to Support its Mission and Goals
Creators: name: Pohl, Ingrid A.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2003
Subjects: Web sites--Evaluation
Nonprofit organizations
Web Sites--Aims & Objectives
Advocacy Organizations
Use studies--Internet

description: This paper describes a usability study conducted on the Web site of the Agricultural Resources Center, a nonprofit environmental advocacy organization, to determine if the site effectively communicates the mission and goals of the organization. Through surveys, interviews, and the observation of eight participants interacting with the site, this study found that participants perceived the content on the site to be valuable, trustworthy, and of high quality. However, the presentation and navigation of the site interfered with participants' ability to successfully experience or learn from the content. Participants requested more opportunities to take action, a clearer, stronger message about the objectives and services of the organization, and a more appealing layout and design. Participants' perceptions guided a number of recommendations to improve the presentation, navigation, and quality of the Agricultural Resources Center Web site, and thus, improve its ability to effectively communicate its mission and goals.
Reproducing the Acoustic Velocity Vectors in a Spherical Listening Region
Creators: name: Wang, Jiarui
name: Abhayapala, Thushara
name: Zhang, Jihui Aimee
name: Samarasinghe, Prasanga
Publisher: name: arXiv
Year: 2023
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Acoustic velocity vectors (AVVs) are related to the human's perception of sound at low frequencies and are widely used in Ambisonics. This paper proposes a spatial sound field reproduction algorithm called velocity matching, which reproduces the AVVs in the spherical listening region by matching the AVVs' spherical harmonic coefficients. Using the sound field translation formula, the spherical harmonic coefficients of the AVVs are derived from the spherical harmonic coefficients of the pressure, which can be measured by a higher-order microphone array. Unlike algorithms that only control the AVVs at discrete sweet spots, the proposed velocity matching algorithm manipulates the AVVs in the whole spherical listening region and allows the listener to move beyond the sweet spots. Simulations show the proposed velocity matching algorithm accurately reproduces the AVVs in the spherical listening region and requires fewer number of loudspeakers than pressure matching algorithm.
description: Accepted for publication in IEEE Signal Processing Letters
Particle shape characterization of shaking table streams in a Turkish chromite concentration plant by using dynamic imaging and microscopical techniques
Creators: name: Ulusoy, Ugur
name: Atagun, Osman Nuri
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biochemistry
subject: Space Science
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Cell Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Developmental Biology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: To the best of the authors’ knowledge, this study is one of its kind since it is related to the quantitative shape examination of particles of feed, concentrate, middling and tailing products in coarse and fine shaking table streams of a Turkish chromite concentration plant. In this study, the novel technique; Dynamic image analysis (DIA) as well as visual inspection by SEM and stereomicroscope were used for the representative samples of the plant. Analysis revealed that particle shapes of concentrate products are mostly equant or round while the most elongated particles were observed in tailing products at a 95% confidence level. This is highly linked to the rolling and sliding movement of round and elongated particles, respectively on the deck. This implies that particle shape is one of the parameters affecting gravity separation. Using shape data with tonnages of the circuits in mass balance equations indicates that shape distributions of products in table circuits are consistent. This study gives insight as better separation recovery could be obtained when a proper mill is used for producing feed particles, which have targeted shape to shaking tables since any improvements in recovery will have a big effect on the concentrate income.
Quantification of stochastic fragmentation of self-gravitating discs
Creators: name: Young, Matthew D.
name: Clarke, Cathie J.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Using 2D smoothed particle hydrodynamics, we investigate the distribution of wait times between strong shocks in a turbulent, self-gravitating accretion disc. We show the resulting distributions do not depend strongly on the cooling time or resolution of the disc and that they are consistent with the predictions of earlier work (Young & Clarke 2015; Cossins et al. 2009, 2010). We use the distribution of wait times between shocks to estimate the likelihood of stochastic fragmentation by gradual contraction of shear-resistant clumps on the cooling time scale. We conclude that the stochastic fragmentation mechanism (Paardekooper 2012) cannot change the radius at which fragmentation is possible by more than ~20%, restricting direct gravitational collapse as a mechanism for giant planet formation to the outer regions of protoplanetary discs.
description: Accepted for publication in MNRAS. 6 pages and 3 figures
Differences in Productivity with Scrum and Kanban: A Comparative Study
Creators: name: Kanevche, Jovan
name: Salkoski, Rasim
name: Shikoski, Blagoj
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 460901
subject: Business process management
classificationCode: 460902
subject: Decision support and group support systems
classificationCode: 460903
subject: Information modelling, management and ontologies
classificationCode: 460904
subject: Information security management
classificationCode: 460905
subject: Information systems development methodologies and practice
classificationCode: 460906
subject: Information systems education
classificationCode: 460907
subject: Information systems for sustainable development and the public good

description: This research paper investigates the productivity differences between Scrum and Kanban, twowidely adopted Agile methodologies in software development. The study examines projectcompletion rates, team satisfaction, and overall productivity to determine the effectiveness of Scrumand Kanban. Data was collected through a comprehensive literature review, analysis of the 15thAnnual State of Agile Report, case studies, interviews, and expert opinions. The data analysisinvolved the use of descriptive statistics, inferential statistics, and qualitative analysis techniques toprovide a comprehensive understanding of the productivity differences between the twomethodologies. By offering insights into the factors contributing to the productivity differencesbetween Scrum and Kanban, this paper provides valuable guidance for organizations looking tooptimize their software development processes by choosing the most appropriate Agilemethodology for their projects
LGBTQ Center Resource Library Access: A Case Study
Creators: name: Ewing, Kai
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2015
Subjects: Library reorganization
LGBT libraries
Information organization

description: This case study discusses why LGBTIQ collections are important, LGBTIQ people and their needs, a brief history of UNC and the LGBTQ Center, and work done at the LGBTQ Center's Resource Library. This included inventorying and cataloging the collection as well as working on the Resource Library webpage. Finally, the study addresses results of the reorganization process, limitations faced in this particular setting, and lists recommendations for other LGBTIQ groups, organizations, offices, and centers looking to increase the visibility of their collections.
By conducting and writing the results of this case study, I hope to contribute to the literature on how LGBTIQ organizations on college and university campuses develop and promote their collections. In particular, I hope to create a template LGBTIQ-focused organizations, centers, and offices can employ to build representative collections and represent their existing resource library in their institution's online catalog.
Few-second-long correlation times in a quantum dot nuclear spin bath probed by frequency-comb NMR spectroscopy
Creators: name: Waeber, A. M.
name: Hopkinson, M.
name: Farrer, I.
name: Ritchie, D. A.
name: Nilsson, J.
name: Stevenson, R. M.
name: Bennett, A. J.
name: Shields, A. J.
name: Burkard, G.
name: Tartakovskii, A. I.
name: Skolnick, M. S.
name: Chekhovich, E. A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: One of the key challenges in spectroscopy is inhomogeneous broadening that masks the homogeneous spectral lineshape and the underlying coherent dynamics. A variety of techniques including four-wave mixing and spectral hole-burning are used in optical spectroscopy while in nuclear magnetic resonance (NMR) spin-echo is the most common way to counteract inhomogeneity. However, the high-power pulses used in spin-echo and other sequences often create spurious dynamics obscuring the subtle spin correlations that play a crucial role in quantum information applications. Here we develop NMR techniques that allow the correlation times of the fluctuations in a nuclear spin bath of individual quantum dots to be probed. This is achieved with the use of frequency comb excitation which allows the homogeneous NMR lineshapes to be measured avoiding high-power pulses. We find nuclear spin correlation times exceeding 1 s in self-assembled InGaAs quantum dots - four orders of magnitude longer than in strain-free III-V semiconductors. The observed freezing of the nuclear spin fluctuations opens the way for the design of quantum dot spin qubits with a well-understood, highly stable nuclear spin bath.
Point nodes persisting far beyond Tc in Bi2212
Creators: name: Kondo, Takeshi
name: Malaeb, W.
name: Ishida, Y.
name: Sasagawa, T.
name: Sakamoto, H.
name: Takeuchi, Tsunehiro
name: Tohyama, T.
name: Shin, S.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In contrast to a complex feature of antinodal state, suffering from competing order(s), the "pure" pairing gap of cuprates is obtained in the nodal region, which therefore holds the key to the superconducting mechanism. One of the biggest question is whether the point nodal state as a hallmark of d-wave pairing collapses at Tc like the BCS-type superconductors, or it instead survives above Tc turning into the preformed pair state. A difficulty in this issue comes from the small magnitude of the nodal gap, which has been preventing experimentalists from solving it. Here we use a laser ARPES capable of ultrahigh energy resolution, and detect the point nodes surviving far beyond Tc in Bi2212. By tracking the temperature evolution of spectra, we reveal that the superconductivity occurs when the pair breaking rate is suppressed smaller than the single particle scattering rate on cooling, which governs the value of Tc in cuprates.
On the Interface between Perturbative and Nonperturbative QCD
Creators: name: Deur, A.
name: Brodsky, S. J.
name: de Teramond, G. F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The QCD running coupling $α_s(Q^2)$ sets the strength of the interactions of quarks and gluons as a function of the momentum transfer $Q$. The $Q^2$ dependence of the coupling is required to describe hadronic interactions at both large and short distances. In this article we adopt the light-front holographic approach to strongly-coupled QCD, a formalism which incorporates confinement, predicts the spectroscopy of hadrons composed of light quarks, and describes the low-$Q^2$ analytic behavior of the strong coupling $α_s(Q^2)$. The high-$Q^2$ dependence of the coupling $α_s(Q^2)$ is specified by perturbative QCD and its renormalization group equation. The matching of the high and low $Q^2$ regimes of $α_s(Q^2)$ then determines the scale $Q_0$ which sets the interface between perturbative and nonperturbative hadron dynamics. The value of $Q_0$ can be used to set the factorization scale for DGLAP evolution of hadronic structure functions and the ERBL evolution of distribution amplitudes. We discuss the scheme-dependence of the value of $Q_0$ and the infrared fixed-point of the QCD coupling. Our analysis is carried out for the $\bar{MS}$, $g_1$, $MOM$ and $V$ renormalization schemes. Our results show that the discrepancies on the value of $α_s$ at large distance seen in the literature can be explained by different choices of renormalization schemes. We also provide the formulae to compute $α_s(Q^2)$ over the entire range of space-like momentum transfer for the different renormalization schemes discussed in this article.
description: 20 pages, 3 figures. V2: Version accepted for publication (Phys.Lett. B757 275 (2016)). V3: Corrected Fig.3 for wrong label (data were plotted vs Q, not Q^2)