cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Conservation of orbital angular momentum in air core optical fibers
Creators: name: Gregg, P.
name: Kristensen, P.
name: Ramachandran, S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Light's orbital angular momentum (OAM) is a conserved quantity in cylindrically symmetric media; however, it is easily destroyed by free-space turbulence or fiber bends, because anisotropic perturbations impart angular momentum. We observe the conservation of OAM even in the presence of strong bend perturbations, with fibers featuring air cores that appropriately sculpt the modal density of states. In analogy to the classical reasoning for the enhanced stability of spinning tops with increasing angular velocity, these states' lifetimes with OAM magnitude. Consequently, contrary to convention wisdom that ground states of systems are the most stable, OAM longevity in air-core fiber increases with mode order. Aided by conservation of this fundamental quantity, we demonstrate fiber propagation of 12 distinct higher-order OAM modes, of which 8 remain low-loss and >98% pure from near-degenerate coupling after km-length propagation. The first realization of long-lived higher-order OAM states, thus far posited to exist primarily in vacuum, is a necessary condition for achieving the promise of higher-dimensional OAM-based classical and quantum communications over practical distances.
description: 19 pages, main text and supplementary information
Insights into the origins and evolution of mutualistic insect-bacterial symbioses
Creators: name: Oakeson, Kelly F.
Publisher: name: University of Utah
Year: 2014
Subjects: Insects
Bacterial endosymbionts

description: A diverse array of insect species harbor maternally transmitted mutualistic bacterial endosymbionts that perform a variety of functions within their hosts. Many of these associations are obligate in nature with the insect relying on the bacterial symbiont to provide nutrients that are lacking in the insect's natural diet. These obligate endosymbionts often show a highly reduced genome size and maintain only a small fraction of the gene inventory of free-living bacteria. Some of the smallest known bacterial genomes are from obligate endosymbionts that have been associated with their insect hosts for long periods of time. In addition to their small size, the genomes of ancient obligate symbionts also show an increased rate of DNA and polypeptide sequence evolution as well as a nucleotide composition bias that results in an increased ratio of adenine and thymine residues. Despite extensive study of these ancient endosymbionts, little is known about their origins. To address this issue and to better understand the forces shaping genomes in the early stages of an endosymbiotic association, this work focuses on two bacteria: strain HS, a recently characterized free-living bacterium that likely served as a progenitor to the Sodalis-allied clade of bacterial endosymbionts, and the Sitophilus oryzae primary endosymbiont (SOPE), a very recent established maternally transmitted obligate endosymbiont of the rice weevil. The complete genome sequencing of these two bacteria along with comparative genomic analyses revealed that SOPE has undergone a very rapid degeneration of its genome, losing nearly half of its coding capacity, a massive expansion of insertion sequence (IS) elements and numerous intragenomic rearrangements facilitated by the IS elements. Surprisingly, these changes have happened very recently since strain HS and SOPE shared a common ancestor approximately 28,000 years ago.
Supplementary document for Crystal superlattices for versatile and sensitive quantum spectroscopy - 6245898.pdf
Creators: name: Toa, Zi Siang Desmond
name: Chekhova, Maria
name: Krivitsky, Leonid
name: Paterova, Anna
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Uncategorized

description: Supplement 1
Examining the Infrared Variable Star Population Discovered in the Small Magellanic Cloud Using the SAGE-SMC Survey
Creators: name: Polsdofer, Elizabeth
name: Seale, Jonathan
name: Sewilo, Marta
name: Vijh, Uma
name: Meixner, Margaret
name: Marengo, Massimo
name: Terrazas, Maverick
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present our study on the infrared variability of point sources in the Small Magellanic Cloud (SMC). We use the data from the Spitzer Space Telescope Legacy Program "Surveying the Agents of Galaxy Evolution in the Tidally Stripped, Low Metallicity Small Magellanic Cloud" (SAGE-SMC) and the "Spitzer Survey of the Small Magellanic Cloud" (S$^{3}$MC) survey, over three different epochs, separated by several months to three years. Variability in the thermal infrared is identified using a combination of Spitzer's IRAC 3.6, 4.5, 5.8, and 8.0 $μ$m bands, and the MIPS 24 $μ$m band. An error-weighted flux difference between each pair of three epochs ("variability index") is used to assess the variability of each source. A visual source inspection is used to validate the photometry and image quality. Out of $\sim$2 million sources in the SAGE-SMC catalog, 814 meet our variability criteria. We matched the list of variable star candidates to the catalogs of SMC sources classified with other methods, available in the literature. Carbon-rich Asymptotic Giant Branch (AGB) stars make up the majority (61%) of our variable sources, with about a third of all of our sources being classified as extreme AGB stars. We find a small, but significant population of oxygen-rich AGB (8.6%), Red Supergiant (2.8%), and Red Giant Branch (<1%) stars. Other matches to the literature include Cepheid variable stars (8.6%), early-type stars (2.8%), young-stellar objects (5.8%), and background galaxies (1.2%). We found a candidate OH maser star, SSTISAGE1C J005212.88-730852.8, which is a variable O-rich AGB star, and would be the first OH/IR star in the SMC, if confirmed. We measured the infrared variability of a rare RV Tau variable (a post-AGB star) that has recently left the AGB phase. Fifty nine variable stars from our list remain unclassified.
description: 46 pages overall, 18 figure files, 13 figures, accepted by AJ
THE COMMERCIAL AGRICULTURAL ECONOMY OF THE EAST CAPE
Diie kommersiele landbou-ekonomie van die Oos-Kaap
Creators: name: Antrobus, G. G.
name: Antrobus, G. G.
Publisher: name: Unknown
Year: 1991
Subjects: Agricultural and Food Policy
Political Economy

description: The East Cape, and in particular the Smaldeel area, is used to exemplify some of the characteristics and problems of commercial farming over a period of about three decades to serve as a backdrop for the broader theme of normalising South African agriculture. The regional economy is dominated by Port Elizabeth-Uitenhage and East London which account for most of the population and threefourths of the Gross Geographic Product (GGP). Agriculture accounts for only 10% of GGP, but is one of the most labour intensive sectors in a region with 24% of its population unemployed. The agricultural economy of the region is very diversified, but livestock farming plays the most important part in all areas contributing 72% of gross income. The chief changes which have occured in East Cape farming, as elsewhere, have been the decline in the number of farms and increase in farm size, greater capital investment, increased specialisation and declining employment. There are also indications, though based on limited information, of an apparent decline in the real returns to capital investment from livestock farming in the Smaldeel area. The causes are, inter alia, rising interest rates, inflation and a decade of below average rainfall. The implications for prospective commercial farmers is that the industry will continue to be difficult to enter because of the relatively large capital requirements and low short-term returns. Several possibilities, especially in direct sales and alternative labour arrangements may nevertheless enable successful competition.
O papel da iniciativa open access no uso e na promoção do conhecimento na Universidade Eduardo Mondlane - UEM
Creators: name: Mangue, Manuel Valente
name: Mateus, Delfina Lázaro
name: Mutuque, Leila Enoque
name: Mabota, Siena de Nascimento
Publisher: name: Zenodo
Year: 2022

description: Apresentação realizada na sessão O meu Póster em 40 segundos da 13ª Conferência Lusófona de Ciência Aberta, formato híbrido, de 10 a 12 de outubro de 2022.
Additional file 2 of The effectiveness of Bio-Min toothpaste in the management of white spot lesions: a randomised control trial
Creators: name: Johal, Ama
name: Keogh, Aoife
name: Bolooki, Honieh
Publisher: name: figshare
Year: 2024
Subjects: Medicine
Cell Biology
Pharmacology
Biological Sciences not elsewhere classified
Science Policy

description: Supplementary Material 2.
Supplementary document for Crystal superlattices for versatile and sensitive quantum spectroscopy - 6095384.pdf
Creators: name: Toa, Zi Siang Desmond
name: Paterova, Anna
name: Chekhova, Maria
name: Krivitsky, Leonid
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Uncategorized

description: Supplement 1
Long-term trends, current status, and transitions of water quality in Chesapeake Bay
Creators: name: Gallegos, C.L.
name: Miller, W.D.
name: Paerl, H.W.
name: Adolf, J.E.
name: Perry, E.S.
name: Mallonee, M.E.
name: Harding, L.W., Jr.
Publisher: name: Nature Publishing Group
Year: 2019

description: Coincident climatic and human effects strongly influence water-quality properties in estuarine-coastal ecosystems around the world. Time-series data for a number of ecosystems reveal high spatio-temporal variability superimposed on secular trends traceable to nutrient over-enrichment. In this paper, we present new analyses of long-term data for Chesapeake Bay directed at several goals: (1) to distinguish trends from spatio-temporal variability imposed by climatic effects; (2) to assess long-term trends of water-quality properties reflecting degradation and recovery; (3) to propose numerical water-quality criteria as targets for restoration; (4) to assess progress toward attainment of these targets. The bay has experienced multiple impairments associated with nutrient over-enrichment since World War II, e.g., low dissolved oxygen (DO), decreased water clarity, and harmful algal blooms (HAB). Anthropogenic eutrophication has been expressed as increased chlorophyll-a (chl-a) driven by accelerated nutrient loading from 1945 to 1980. Management intervention led to decreased loading thereafter, but deleterious symptoms of excess nutrients persist. Climatic effects exemplified by irregular “dry” and “wet” periods in the last 30+ years largely explain high inter-annual variability of water-quality properties, requiring adjustments to resolve long-term trends. Here, we extend these analyses at a finer temporal scale to six decades of chl-a, Secchi depth, and nitrite plus nitrate (NO 2 + NO 3 ) data to support trend analyses and the development of numerical water-quality criteria. The proposed criteria build on a conceptual model emphasizing the need to distinguish climatic and human effects in gauging progress to reverse eutrophication in estuarine-coastal ecosystems.
A Parameterized Base Station Power Model
Creators: name: Holtkamp, Hauke
name: Auer, Gunther
name: Giannini, Vito
name: Haas, Harald
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Power models are needed to assess the power consumption of cellular Base Station (BS) on an abstract level. Currently available models are either too simplified to cover necessary aspects or overly complex. We provide a parameterized linear power model which covers the individual aspects of a BS which are relevant for a power consumption analysis, especially the transmission bandwidth and the number of radio chains. Details reflecting the underlying architecture are abstracted in favor of simplicity and applicability. We identify current power-saving techniques of cellular networks for which this model can be used. Furthermore, the parameter set of typical commercial BS is provided and compared to the underlying complex model. The complex model is well approximated while only using a fraction of the input parameters.
description: 9 pages
Imaging and Structure Analysis of ICRF Sources at X- and K-band.
Creators: name: De Witt, Aletha
name: Jacobs, Christopher
name: Gordon, David
name: Hunt, Lucas
name: Johnson, Meghan
Publisher: name: Zenodo
Year: 2022
Subjects: ICRF
VLBI
astrometry
reference frames

description: The third and most recent realization of the International Celestial Reference Frame, the ICRF-3 included
 data up to 2018 from the original S/X frequencies as well as observations at K-band (24 GHz) and at X/Ka-band (8.4/32 GHz), extending the ICRF up from 8 GHz for the first time. The K-band Celestial Reference Frame (CRF) has matured greatly in recent years, allowing K-band to achieve source position precision comparable to the S/X CRF. The use of K-band is motivated by the fact that the sources are generally intrinsically more compact at higher frequencies, as well as by the factor of three improvement in interferometer resolution relative to S/X frequencies. Astrometric-imaging observations using the VLBA have been used to create sensitive, high-resolution, multi-epoch images of our sources at K-band from which we derive quantitative estimates of source strength, size, compactness, and the temporal stability of these quantities. Recent multi-epoch, quasi-simultaneous S/X and K-band astrometric-imaging observations using the VLBA, allow us to directly compare the source structure at S/X and K-band and allow us to characterize astrophysical systematics in the CRF.
Freeze-and-Thaw Phenomena in Concretes and Aggregates
Creators: name: Havens, James H.
Publisher: name: Kentucky Transportation Center, University of Kentucky
Year: 1970
Subjects: subject: Transportation Engineering

description: This report summarizes several years of research relating to damage to concrete and aggregates undergoing freezing and thawing. Basic principles involving freezing and attendant pressures are considered. Application of these principles to the evaluation of concrete was accomplished in experiments on concrete having low and high air contents. The effects of air entrainment upon freeze-thaw resistance were demonstrated.  Freeze-thaw characteristics of saturated aggregates relative to their physical properties such as porosity, absorption and bulk specific gravity were studied by submerging individual particles in pre-chilled mercury. Pressures associated with popouts in concrete were monitored and are presented along with accompanying theoretical considerations.
Mattering the situated and social nature of schoolyard play
Creators: name: Michelle Bergin
name: Maria Prellwitz
name: Margareta Lilja
name: Bryan Boyle
Publisher: name: Zenodo
Year: 2022
Subjects: Situated and social dimensions of occupations
Collective occupations
Schoolyard play

description: This research was shared at the inaugural World Occupational Science Conference, 2022 as a poster presentation and also invited participants to further engage with the research, thinking with theory on schoolyards as collective occupations. 

An initial analysis of an inquiry into children’s schoolyard play,considers schoolyard breaktime as collective occupations.Informed by post-qualitative approaches,this inquiry enacts an"agential cut“ diffracting data from three qualitative research studies exploring schoolyard play with Occupational Science conceptualizations of situated and collective occupations. The schoolyard is(re)presented as significant in the social lives of children,and as a space of inequality and exclusion. Researchers from diverse disciplines,have applied spatial and sociological theories,to understand issues of identity,agency,power,and belonging during interactions within the schoolyard. The role of occupations in these shared,social processes has received less attention.Situated materials, discourses and embodied doings intra-acting in a momentary cut are presented alongside a mattering of collective doing. Finding"the play”using post qualitative approaches can generate knowledges of the always becoming nature and differences entangled in collective doing in schoolyards. (In)forming practices recognises that focusing on what matters risks also excluding other kinds of mattering.
Thomson problem in the disk: supplemental material
Creators: name: Amore, Paolo
name: Zarate, Ulises
Publisher: name: Zenodo
Year: 2023
Subjects: divide and conquer; minimization; Thomson problem

description: This document contains supplemental material of the paper "Thomson problem in the disk", where the Thomson problem in the disk has been studied. Here we report the lowest minima for all the configuration with N ≤ 330 and selected configurations for larger N . To the best of our knowledge configurations with N > 5000 had never before been considered in the literature.
description: New version with improved configurations for 1000, 5000 and 40886 charges
The SEGUE K Giant Survey. III. Quantifying Galactic Halo Substructure
Creators: name: Janesh, William
name: Morrison, Heather L.
name: Ma, Zhibo
name: Rockosi, Constance
name: Starkenburg, Else
name: Xue, Xiang Xiang
name: Rix, Hans-Walter
name: Harding, Paul
name: Beers, Timothy C.
name: Johnson, Jennifer
name: Lee, Young Sun
name: Schneider, Donald P.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We statistically quantify the amount of substructure in the Milky Way stellar halo using a sample of 4568 halo K giant stars at Galactocentric distances ranging over 5-125 kpc. These stars have been selected photometrically and confirmed spectroscopically as K giants from the Sloan Digital Sky Survey's SEGUE project. Using a position-velocity clustering estimator (the 4distance) and a model of a smooth stellar halo, we quantify the amount of substructure in the halo, divided by distance and metallicity. Overall, we find that the halo as a whole is highly structured. We also confirm earlier work using BHB stars which showed that there is an increasing amount of substructure with increasing Galactocentric radius, and additionally find that the amount of substructure in the halo increases with increasing metallicity. Comparing to resampled BHB stars, we find that K giants and BHBs have similar amounts of substructure over equivalent ranges of Galactocentric radius. Using a friends-of-friends algorithm to identify members of individual groups, we find that a large fraction (~33%) of grouped stars are associated with Sgr, and identify stars belonging to other halo star streams: the Orphan Stream, the Cetus Polar Stream, and others, including previously unknown substructures. A large fraction of sample K giants (more than 50%) are not grouped into any substructure. We find also that the Sgr stream strongly dominates groups in the outer halo for all except the most metal-poor stars, and suggest that this is the source of the increase of substructure with Galactocentric radius and metallicity.
description: 49 pages; 24 figures. Accepted to ApJ; revisions made due to the referee's comments, notably an updated result: K giants and BHBs have similar substructure over similar distance ranges; previously we concluded that K giants were more highly structured (see Section 4.3). Additionally, we have updated the discussion on false positive groups and group membership trends in Section 5.3
Construction and politicization of waiqi white-collar identity - Traveling knowledge about Chinese professionals in multinational corporations in China
Creators: name: Yan, Junchen
Publisher: name: InterDisciplines. Journal of History and Sociology
Year: 2017

description: This paper addresses the production of knowledge about highly qualified Chinese working in foreign enterprises in an entangled discourse field. The point of departure for this issue is a critical review of American political scientist Margaret Pearson’s (1997) Study “China's new business elite: The political consequences of economic reform”, exploring its epistemological and ontological assumptions of investigating the attitudes and behaviors of “China´s new business elite”. Furthermore, this paper will also discuss the political-institutional reception conditions under which the knowledge about highly qualified Chinese working in foreign enterprises beyond its US-American production context is transformed into the Chinese discourse on modernization and the middle class. The Chinese interest in this Western scientific knowledge stems less from the necessity of decolonization rather than the appropriation of Western knowledge in order to fit local government´s agenda. Knowledge production of highly qualified Chinese working in MNCs both ways go hand in hand with essentialization and functionalization of the research subject and, disable to recognize the social constructive nature of groups.
description: InterDisciplines. Journal of History and Sociology, Vol 8 No 1 (2017): Postcolonialism and China
Thomson problem in the disk: supplemental material
Creators: name: Amore, Paolo
name: Zarate, Ulises
Publisher: name: Zenodo
Year: 2023
Subjects: divide and conquer; minimization; Thomson problem

description: This document contains supplemental material of the paper "Thomson problem in the disk", where the Thomson problem in the disk has been studied. Here we report the lowest minima for all the configuration with N ≤ 330 and selected configurations for larger N . To the best of our knowledge configurations with N > 5000 had never before been considered in the literature.
Mattering the situated and social nature of schoolyard play
Creators: name: Bergin, Michelle
name: Prellwitz, Maria
name: Lilja, Margareta
name: Boyle, Bryan
Publisher: name: Zenodo
Year: 2022
Subjects: Situated and social dimensions of occupations
Collective occupations
Schoolyard play

description: This research was shared at the inaugural World Occupational Science Conference, 2022 as a poster presentation and also invited participants to further engage with the research, thinking with theory on schoolyards as collective occupations. An initial analysis of an inquiry into children’s schoolyard play,considers schoolyard breaktime as collective occupations.Informed by post-qualitative approaches,this inquiry enacts an"agential cut“ diffracting data from three qualitative research studies exploring schoolyard play with Occupational Science conceptualizations of situated and collective occupations. The schoolyard is(re)presented as significant in the social lives of children,and as a space of inequality and exclusion. Researchers from diverse disciplines,have applied spatial and sociological theories,to understand issues of identity,agency,power,and belonging during interactions within the schoolyard. The role of occupations in these shared,social processes has received less attention.Situated materials, discourses and embodied doings intra-acting in a momentary cut are presented alongside a mattering of collective doing. Finding"the play”using post qualitative approaches can generate knowledges of the always becoming nature and differences entangled in collective doing in schoolyards. (In)forming practices recognises that focusing on what matters risks also excluding other kinds of mattering.
description: {"references": ["Kantartzis, S., & Molineux, M. (2017). Collective occupation in public spaces and the construction of the social fabric, Canadian Journal of Occupational Therapy, 84(3), 168\u2013177. DOI.10.1177/0008417417701936", "Russell, W. (2021). The Case for Play in Schools: A review of the literature https://outdoorplayandlearning.org.uk/wp-content/uploads/2021/10/The-Case-For-Play-In-Schools-web-1-1.pdf..", "Peters, M.et al (2020). Updated methodological guidance for the conduct of scoping reviews.JBI Evidence Synthesis,18(10), 2119\u20132126. DOI:10.11124/JBIES-20-001674.", "2.Barad,K.(2014).Diffracting Diffraction: Cutting Together-Apart,Parallax,20 (3),168-187,DOI:10.1080/13534645.2014.9276233"]}
Water quality trends in the Three Gorges Reservoir region before and after impoundment (1992–2016)
Creators: name: Ma, J.
name: Fang, F.
name: Brookes, J.D.
name: Ouyang, W.
name: Paerl, H.W.
name: Xiao, Y.
name: Lunhui, L.
name: Guo, J.
name: Li, Z.
Publisher: name: Elsevier B.V.
Year: 2019

description: Reservoirs are essential for the wellbeing of human societies, but can also be subject to negative ecological impacts. The Three Gorges Reservoir (TGR) in the upper Yangtze River is remarkable for its size and engineering; however, its effects on water quality are poorly understood. To the best of our knowledge, this study is the first to describe long-term (1992–2016) monitoring. It showed that the chemical oxygen demand (COD, via the potassium permanganate index) and total phosphorus (TP) have decreased 40.9% ± 9.9% and 22.2% ± 9.7% respectively in the TGR mainstream between impoundment in June 2003 and 2016, while total nitrogen (TN) and ammonium (NH4-N) have increased 1.3% ± 2.4% and 8.2% ± 2.6%. In addition, phytoplankton biomass has increased by a factor of 2.7 (1.1–4.8) over pre-impoundment levels in the mainstream, and tributary algal blooms have increased in frequency since 2004. The reductions in COD and TP were caused primarily by decreases in water flow speed, which lead to sediment settlement. The anti-seasonal operation pattern and water volume increased TGR may also increases the dilution capacity. TN and ammonium are less affected by sediment deposition and have increased slightly under intensified human activities. Decreased water flow speeds and nutrient enrichment have promoted increases in algal biomass, leading to blooms in tributary backwater zones. In situ experiments indicate that phytoplankton growth in the TGR is phosphorus limited during all seasons. Therefore, controlling phosphorus will reduce the short-term eutrophication potential in the reservoir. However, concurrent control of nitrogen and phosphorus inputs are necessary in the long term.
Spatial and temporal distribution characteristics of different forms of inorganic nitrogen in three types of rivers around Lake Taihu, China
Creators: name: Gao, Y.
name: Zhu, G.
name: Qin, B.
name: Paerl, H.W.
name: Yu, J.
name: Song, Y.
Publisher: name: Springer Verlag
Year: 2019

description: In order to control nitrogen (N) pollution of Lake Taihu, China, we studied the spatial and temporal distribution characteristics of inorganic N in inflowing rivers polluted by industry, agriculture, and domestic sewage during low, moderate, and high flow periods. The results showed that dissolved total nitrogen (DTN) was the main fraction of total nitrogen (TN) input from these rivers. Inflowing rivers had distinct impacts on TN, DTN, ammonium N (NH 4 + ), and nitrate N (NO 3 − ) concentrations of Lake Taihu during the low flow period. Particulate nitrogen (PN) had an impact on Lake Taihu during the three flow periods and all the three types of rivers would increase PN concentration in the lake. Rivers polluted by agriculture had the greatest impact on Lake Taihu’s TN, DTN, NO 3 − , and dissolved inorganic N (DIN) concentrations, while rivers polluted by industry had the greatest impact on NH 4 + concentration. Therefore, agriculture and industry should be key targets for nutrient reductions. The in-lake N concentrations were higher than those of inflowing rivers during moderate and high flow periods.
Repositórios sobre arte dos países da Comunidade dos Países de Língua Portuguesa
Creators: name: Alves, Fernanda Maria Melo
name: Guambe, Martins
Publisher: name: Zenodo
Year: 2022

description: Apresentação realizada na sessão O meu Póster em 40 segundos da 13ª Conferência Lusófona de Ciência Aberta, formato híbrido, de 10 a 12 de outubro de 2022.
Towards a noncommutative Brouwer fixed-point theorem
Creators: name: Dabrowski, Ludwik
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Algebra (math.QA)
subject: General Topology (math.GN)
subject: FOS: Mathematics

description: We present some results and conjectures on a generalization to the noncommutative setup of the Brouwer fixed-point theorem from the Borsuk-Ulam theorem perspective.
description: 9 pages
Intelligent Assistance for Older Adults via an Admittance-Controlled Wheeled Mobile Manipulator with Task-Dependent End-Effectors
Creators: Liang Ding , Hongjun Xing, Ali Torabi, Javad K. Mehr, Mojtaba Sharifi, Haibo Gao, Vivian K. Mushahwar, Mahdi Tavakoli
Publisher: name: University of Alberta Library
Year: 2022

The increase in the ageing population worldwide poses a severe challenge in assisting older individuals to live independently,

including the provision of mobility assistance and support in daily activities. In this paper, a practical robotic system is developed

to provide intelligent support for older persons using a wheeled mobile manipulator (WMM), consisting of an omnidirectional

mobile platform and a robotic arm. We focus on two critical needs: 1) mobility assistance, and 2) object manipulation support. The

tasks are not executed simultaneously and each uses a task-dependent end-effector. Learning from demonstration, or kinesthetic

teaching, is adopted to help the WMM to learn an elderly or disabled user’s walking pattern or an able-bodied person’s object

manipulation skill. The robotic system can assist the user in conducting a number of daily operations. For mobility assistance,

the WMM is reconfigured into a smart walker, where a novel variable admittance control is adopted to detect the user’s walking

intention. A learning approach based on dynamic movement primitives is implemented to capture and adapt the WMM to the user’s

walking pattern. For object manipulation support, a demonstrator first collaborates with an elderly user to conduct the task, and then

the WMM takes the role of the demonstrator to assist the user. The Gaussian mixture model and Gaussian mixture regression are

used to learn and reproduce the demonstrator’s experience, respectively. The advantages and effectiveness of the proposed approach

are experimentally demonstrated with a four-wheel omnidirectional WMM.
Exploring the limits of DGT-speciation concept for arsenic – application in the Scheldt estuary
Creators: name: Smolíková, Vendula
name: Ma, Tianhui
name: Gao, Yue
name: Leermakers, Martine
Publisher: name: Zenodo
Year: 2023

description: Presentation at the 7th DGT conference (DGT2023) in Paris.
Occurrence and risk assessment of 3-monochloropropanediols esters (3-MCPDE), 2-monochloropropanediol esters (2-MCPDE), and glycidyl esters (GE) in commercial infant formula samples from Malaysia
Creators: name: Azmi, Nik Nur Ashirah Nik
name: Tan, Thuan-Chew
name: Ang, May Yen
name: Leong, Yin-Hui
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Neuroscience
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 60506 Virology
subject: FOS: Biological sciences

description: The presence of 3-monochloropropanediol esters (3-MCPDE), 2-monochloropropanediol esters (2-MCPDE) and glycidyl esters (GE) in infant formula products has raised serious concerns. They incorporate vegetable oils, particularly palm-based oils, which are well-known to contain large amounts of these process contaminants. An analysis was conducted on infant formula samples (n = 16) obtained from the Malaysian market to determine the levels of 3-MCPDE, 2-MCPDE and GE using gas chromatography-mass spectrometry (GC-MS). The method was validated, with a limit of quantification (LOQ) on instrument of 0.10 µg/g for all analytes. The median concentrations of 3-MCPDE, 2-MCPDE and GE in infant formula in this study were 0.008 µg/g, 0.003 µg/g and 0.002 µg/g respectively. The estimated dietary intakes calculated from consumption of infant formula show higher exposures to infants within the age group of 0 to 5 months, highest for GE (1.61 µg/kg bw/day), followed by 3-MCPDE (0.68 µg/kg bw/day) and 2-MCPDE (0.41 µg/kg bw/day) compared to the age group of 6 to 12 months. Only one sample, relating to GE exposure is a potential risk for both age groups with MOE value below 25,000.
Ultrafast dynamics and fragmentation of C60 in intense laser pulses
Creators: name: Lin, Zheng-Zhe
name: Chen, Xi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: The radiation-induced fragmentation of the C60 fullerene was investigated by the tight-binding electron-ion dynamics simulations. In intense laser field, the breathing vibrational mode is much more strongly excited than the pentagonal-pinch mode. The fragmentation effect was found more remarkable at long wavelength lambda>800 nm rather than the resonant wavelengths due to the internal laser-induced dipole force, and the production ratio of C and C2 rapidly grows with increasing wavelength. By such fragmentation law, C atoms, C2 dimers or large Cn fragments could be selectively obtained by changing the laser wavelength. And the fragmentation of C60 by two laser pulses like the multi-step atomic photoionization was investigated.
Gabriel Larose chante et commente le cantique en provençal à saint Antoine, variante de celui à saint Marcel
Creators: name: Musée National Des Arts Et Traditions Populaires (Paris)
name: Centre D'ethnologie Française
Publisher: name: École des Hautes Études en Sciences Sociales; Institut  interdisciplinaire d'anthropologie du contemporain (Paris); Laboratoire d'anthropologie et d'histoire de l'institution de la culture (Paris)
Year: 2024

Abstract
Prominence Activation by Coronal Fast Mode Shock
Creators: name: Takahashi, Takuya
name: Asai, Ayumi
name: Shibata, Kazunari
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: An X5.4 class flare occurred in active region (AR) NOAA11429 on 2012 March 7. The flare was associated with very fast coronal mass ejection (CME) with its velocity of over 2500 km/s. In the images taken with STEREO-B/COR1, a dome-like disturbance was seen to detach from expanding CME bubble and propagated further. A Type-II radio burst was also observed at the same time. On the other hand, in EUV images obtained by SDO/AIA, expanding dome-like structure and its foot print propagating to the north were observed. The foot print propagated with its average speed of about 670 km/s and hit a prominence located at the north pole and activated it. While the activation, the prominence was strongly brightened. On the basis of some observational evidence, we concluded that the foot print in AIA images and the ones in COR1 images are the same, that is MHD fast mode shock front. With the help of a linear theory, the fast mode mach number of the coronal shock is estimated to be between 1.11 and 1.29 using the initial velocity of the activated prominence. Also, the plasma compression ratio of the shock is enhanced to be between 1.18 and 2.11 in the prominence material, which we consider to be the reason of the strong brightening of the activated prominence. The applicability of linear theory to the shock problem is tested with nonlinear MHD simulation.
Wikidata as a Tool for Mapping Investment in Open Infrastructure: An Exploratory Study
Creators: name: Britton, Anne
Publisher: name: Zenodo
Year: 2021
Subjects: wikidata
open infrastructure
open data

description: This working paper shares the results of research conducted to explore Wikidata's current coverage of the domain of open infrastructure and investment therein. The research question investigates whether Wikidata, a collaboratively edited and multilingual knowledge graph hosted by the Wikimedia Foundation, is a viable prospect for hosting investment flow data for open infrastructure. This study was conducted as part of a Research Fellowship with Invest in Open Infrastructure (IOI), and is generously supported by the Alfred P. Sloan Foundation. Additional information about how our work is funded can be found here: https://investinopen.org/about/how-were-funded/
Feedback regulation between aquatic microorganisms and the bloom-forming cyanobacterium Microcystis aeruginosa
Creators: name: Chen, Y.
name: Lu, T.
name: Zhang, M.
name: Zhou, Z.
name: Paerl, H.W.
name: Qian, H.
name: Zhang, Z.
Publisher: name: American Society for Microbiology
Year: 2019

description: The frequency and intensity of cyanobacterial blooms are increasing worldwide. Interactions between toxic cyanobacteria and aquatic microorganisms need to be critically evaluated to understand microbial drivers and modulators of the blooms. In this study, we applied 16S/18S rRNA gene sequencing and metabolomics analyses to measure the microbial community composition and metabolic responses of the cyanobacterium Microcystis aeruginosa in a coculture system receiving dissolved inorganic nitrogen and phosphorus (DIP) close to representative concentrations in Lake Taihu, China. M. aeruginosa secreted alkaline phosphatase using a DIP source produced by moribund and decaying microorganisms when the P source was insufficient. During this process, M. aeruginosa accumulated several intermediates in energy metabolism pathways to provide energy for sustained high growth rates and increased intracellular sugars to enhance its competitive capacity and ability to defend itself against microbial attack. It also produced a variety of toxic substances, including microcystins, to inhibit metabolite formation via energy metabolism pathways of aquatic microorganisms, leading to a negative effect on bacterial and eukaryotic microbial richness and diversity. Overall, compared with the monoculture system, the growth of M. aeruginosa was accelerated in coculture, while the growth of some cooccurring microorganisms was inhibited, with the diversity and richness of eukaryotic microorganisms being more negatively impacted than those of prokaryotic microorganisms. These findings provide valuable information for clarifying how M. aeruginosa can potentially modulate its associations with other microorganisms, with ramifications for its dominance in aquatic ecosystems.
Axion-Higgs interplay in the two Higgs-doublet model
Creators: name: Espriu, Domenec
name: Mescia, Federico
name: Renau, Albert
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the Dine-Fischler-Srednicki (DFS) model in the light of the recent Higgs LHC results and electroweak precision data. The DFS model is a natural extension of the two-Higgs doublet model endowed with a Peccei-Quinn symmetry and leading to a physically acceptable axion. For generic couplings, the model reproduces the minimal Standard Model showing only tiny deviations (extreme decoupling scenario) whereas all additional degrees of freedom (with the exception of the axion) are very heavy. Recently, new corners of this model have been highlighted where it may exhibit enlarged global symmetries making the corresponding models technically natural (naturalness scenario). In some cases an additional Higgs could be present at the weak scale. In this case, the new light $0^+$ state would be accompanied by relatively light charged and neutral pseudoscalar Higgses. We will use the oblique corrections, particularly $Δρ$, to constrain the mass spectrum in this case. As a final result, we also work out the non-linear parametrization of the DFS model in the generic case where all scalars except the lightest Higgs and the axion have masses at or beyond the TeV scale.
description: comments and references added. results unchaged
title: Considerations for the allocation of non-default losses by financial market infrastructures
Creators: name: Costanzo, Daniele
name: Raykov, Radoslav
Publisher: name: Bank of Canada
Year: 2022

description: Non-default losses of financial market infrastructures (FMIs) have gained attention due to their potential impacts on FMIs and FMI participants, and the lack of a common approach to address them. A key question is, who should absorb these losses?

To help answer this, we propose four issues to consider for allocating non-default losses: fairness, economic impact, incentives and regulatory compliance.
description: Les pertes que subissent les infrastructures de marchés financiers (IMF) en dehors des cas de défaillance suscitent une attention grandissante pour deux raisons, soit leur incidence potentielle sur les IMF en tant que telles et leurs participants, et l’absence d’une approche commune pour les gérer. Une grande question se pose : qui devrait assumer ces pertes?

Pour y répondre, nous proposons de prendre en compte les quatre éléments suivants dans la répartition des pertes non liées aux défaillances : équité, impact économique, incitatifs et respect de la réglementation.
Cullen, J.J., 2019. The best available science supports most probable number (MPN) testing methods for type approval of ballast water management systems
Creators: name: Cullen, John J.
Publisher: name: Zenodo
Year: 2019
Subjects: ballast water, most probable number, type approval, vital stains, phytoplankton, United States Coast Guard

description: ABSTRACT The Vessel Incidental Discharge Act of 2018 (VIDA) became law on December 4, 2018, instructing the United States Coast Guard (USCG), in coordination with the U.S. Environmental Protection Agency, to publish a draft policy letter, based on the best available science, describing ballast water management system (BWMS) type-approval testing methods that may be used to measure the concentration of organisms in ballast water that are capable of reproduction. The USCG was required to take into consideration a testing method that uses organism grow-out and most probable number (MPN) statistical analysis. The MPN Dilution Culture + Motility (MPN+M) type-approval testing methodology fits this description: with the U.S. delegation in agreement, MPN+M was approved by the International Maritime Organization for use in type approval of BWMS. Yet, the USCG draft policy letter stated that “the Coast Guard does not know of any type-approval testing protocols for BWMS that render nonviable organisms in ballast water that are based on best available science”, and the letter does not even mention MPN. Highly qualified commenters, each providing supporting documentation, challenged the Coast Guard’s dismissal of MPN, recommending instead that the USCG include an MPN+M protocol in its final policy letter, due on December 4, 2019. A review of the best available science — documented experience, relevant data and peer-reviewed publications, all on the public record — strongly supports the case for MPN+M as a type-approval testing method. The science shows that MPN+M is suitable for testing all BWMS treatment technologies and that it assesses permanent loss of viability. The method has been validated to a higher standard than the USCG-accepted FDA/CMFDA + Motility method and performance metrics show that it provides equivalent or better enforcement of type-approval discharge standards. The best available science supports USCG acceptance of the MPN+M methodology as described in a protocol submitted to them by one of their accepted Independent Laboratories.
description: Slides from a presentation at the 21st International Conference on Aquatic Invasive Species, October 27-31, 2019 Montréal, QC, Canada. Originals were edited for clarity and converted to pdf.
Socioeconomic characteristics versus density changes: the operational effects of population dynamics on water systems
Creators: name: Faure, Julie C.
name: Faust, Kasey M.
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Space Science
subject: Medicine
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Cancer
subject: Science Policy

description: While population density can change the overall water demand of a neighborhood, socioeconomic shifts can change the temporal distribution of daily peak demands. This study seeks to determine the comparative criticality of the impacts of both types of population dynamics on the operations of a water system—as measured by pressure. This study specifically assesses scenarios of gentrification, associated with increases in higher-income populations and density changes. Researchers carried out hydraulic simulations of gentrification scenarios using an existing water system in a gentrifying U.S. city. The results indicate that in gentrifying cities such as Portland and Minneapolis, the impact of the socioeconomic shifts may be negligible when compared that of density changes. In gentrifying cities such as Washington D.C. and Atlanta, however, socioeconomic shifts cannot be overlooked. Given the complexity of population dynamics such as gentrification, we recommend decision-makers to carefully assess these dynamics to enhance urban resilience.
Nitrogen fixation does not axiomatically lead to phosphorus limitation in aquatic ecosystems
Creators: name: Paerl, H.W.
name: de Klein, J.J.M.
name: Janse, J.H.
name: van Gerven, L.P.A.
name: Mooij, W.M.
name: Kuiper, J.J.
Publisher: name: Blackwell Publishing Ltd
Year: 2019

description: A long-standing debate in ecology deals with the role of nitrogen and phosphorus in management and restoration of aquatic ecosystems. It has been argued that nutrient reduction strategies to combat blooms of phytoplankton or floating plants should solely focus on phosphorus (P). The underlying argument is that reducing nitrogen (N) inputs is ineffective because N 2 -fixing species will compensate for N deficits, thus perpetuating P limitation of primary production. A mechanistic understanding of this principle is, however, incomplete. Here, we use resource competition theory, a complex dynamic ecosystem model and a 32-year field data set on eutrophic, floating-plant dominated ecosystems to show that the growth of non-N 2 -fixing species can become N limited under high P and low N inputs, even in the presence of N 2 fixing species. N 2 -fixers typically require higher P concentrations than non-N 2 -fixers to persist. Hence, the N 2 fixers cannot deplete the P concentration enough for the non-N 2 -fixing community to become P limited because they would be outcompeted. These findings provide a testable mechanistic basis for the need to consider the reduction of both N and P inputs to most effectively restore nutrient over-enriched aquatic ecosystems.
Supplementary Material for “Stability and Memory-loss go hand-in-hand: Three Results in Dynamics & Computation” from Stability and memory-loss go hand-in-hand: three results in dynamics and computation
Creators: name: G. Manjunath
Publisher: name: The Royal Society
Year: 2020
Subjects: subject: Artificial Intelligence and Image Processing
subject: FOS: Computer and information sciences
subject: 10299 Applied Mathematics not elsewhere classified
subject: FOS: Mathematics
subject: 80201 Analysis of Algorithms and Complexity

description: Supplementary Material