cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
How mobile phones can improve nutrition among pastoral communities: Panel data evidence from Northern Kenya
Creators: name: Parlasca, Martin C.
name: Mußhoff, Oliver
name: Qaim, Matin
name: Parlasca, Martin C.
name: Mußhoff, Oliver
name: Qaim, Matin
Publisher: name: Unknown
Year: 2018
Subjects: subject: Agricultural and Food Policy
subject: Community/Rural/Urban Development
subject: Food Consumption/Nutrition/Food Safety
subject: Food Security and Poverty
subject: Institutional and Behavioral Economics
subject: Research and Development/Tech Change/Emerging Technologies
subject: mobile phones, dietary diversity, nutrition, pastoralism, Africa, Northern Kenya

description: The digital revolution and the ongoing dissemination of mobile phones carry several prospects for smallholder farmers in Sub-Saharan Africa. Food insecurity remains a major issue among African smallholders. Mobile phones could potentially facilitate access to food markets and thus improve food security and nutrition, but research on such types of effects remains scarce. In this study we analyze whether mobile phones improve dietary quality of pastoralists in Northern Kenya. We use six rounds of household panel data covering the period between 2009 and 2015. During this period, mobile phone ownership in the sample increased from less than 30% to more than 70%. Regression models with household fixed effects allow robust estimation while reducing potential issues of unobserved heterogeneity. The estimates show that mobile phone adoption has increased dietary diversity. The effect size increases with the frequency of mobile phone use. We also examine the underlying mechanisms. Mobile phones improve dietary diversity mainly through better access to purchased foods. These results encourage the promotion of mobile phone technologies as a valuable tool for nutritional improvements, especially in rural settings with poor access to food markets.
La mostruosa coppia della porta accanto
Creators: Redazione Eso
Publisher: name: Media Inaf
Year: 2021

I due buchi neri supermassicci osservati con il Vlt dell’Eso nella costellazione dell'Acquario, all’interno della galassia Ngc 7727, segnano un doppio record: sono la coppia a noi più vicina d’oggetti di questo tipo (89 milioni di anni luce dalla Terra) e sono, anche, i due più vicini fra loro, separati da appena 1600 anni luce
Economia Solidária: sentidos e conceitos
Creators: name: Fontes, Paulo Vitorino
Publisher: name: Zenodo
Year: 2015
Subjects: Economia Solidária

description: Pretende-se de uma forma exploratória, através de pesquisa e análise bibliográfica, perceber e explorar os vários significados atribuídos à Economia Solidária por parte dos actores envolvidos nas suas práticas, bem como os diversos conceitos produzidos na construção de conhecimento sobre este tema, com o propósito de contribuir para a construção e clarificação do conceito de Economia Solidária. Tal objectivo não passa por escolher um dos significados, mas apenas apresentá-los, com o necessário distanciamento valorativo, tendo em conta que cada grupo tem uma maneira própria de interpretar a realidade, com características e formas de agir específicas.
Three dimensional resonating valence bond liquids and their excitations
Creators: name: Moessner, R.
name: Sondhi, S. L.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We show that there are two types of RVB liquid phases present in three-dimensional quantum dimer models, corresponding to the deconfining phases of U(1) and Z_2 gauge theories in d=3+1. The former is found on the bipartite cubic lattice and is the generalization of the critical point in the square lattice quantum dimer model found originally by Rokhsar and Kivelson. The latter exists on the non-bipartite face-centred cubic lattice and generalizes the RVB phase found earlier by us on the triangular lattice. We discuss the excitation spectrum and the nature of the ordering in both cases. Both phases exhibit gapped spinons. In the U(1) case we find a collective, linearly dispersing, transverse excitation, which is the photon of the low energy Maxwell Lagrangian and we identify the ordering as quantum order in Wen's sense. In the Z_2 case all collective excitations are gapped and, as in d=2, the low energy description of this topologically ordered state is the purely topological BF action. As a byproduct of this analysis, we unearth a further gapless excitation, the pi0n, in the square lattice quantum dimer model at its critical point.
description: 9 pages, 2 figures
Luce dalla fusione di buchi neri? Non è escluso
Creators: Valentina Guglielmo
Publisher: name: Media Inaf
Year: 2021

Una rappresentazione artistica di due buchi neri che stanno per fondersi vicino a un buco nero supermassiccio: è quella proposta dalla Nasa la scorsa settimana, e fa riferimento a un evento di fusione registrato nel 2019. Quello che succede dopo potrebbero averlo raccontato le immagini della Zwicky Transient Facility all’osservatorio Palomar, in California
Two types of alternating spin-$\frac12$ chains and their field-induced transitions in $\varepsilon$-LiVOPO$_4$
Creators: name: Mukharjee, Prashanta K.
name: Ranjith, K. M.
name: Baenitz, M.
name: Skourski, Y.
name: Tsirlin, A. A.
name: Nath, R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Thermodynamic properties, $^{31}$P nuclear magnetic resonance (NMR) measurements, and density-functional band-structure calculations for $\varepsilon$-LiVOPO$_4$ are reported. This quantum magnet features a singlet ground state and comprises two types of alternating spin-$\frac12$ chains that manifest themselves by the double maxima in the susceptibility and magnetic specific heat, and by the two-step magnetization process with an intermediate $\frac12$-plateau. From thermodynamic data and band-structure calculations, we estimate the leading couplings of $J_1\simeq 20$ K and $J_2\simeq 60$ K and the alternation ratios of $α_1=J_1'/J_1\simeq 0.6$ and $α_2=J_2'/J_2\simeq 0.3$ within the two chains, respectively. The zero-field spin gap $Δ_0/k_{\rm B}\simeq 7.3$ K probed by thermodynamic and NMR measurements is caused by the $J_1$-$J_1'$ spin chains and can be closed in the applied field of $μ_{0}H_{\rm c1}\simeq 5.6$ T, giving rise to a field-induced long-range order. The NMR data reveal predominant three-dimensional spin-spin correlations at low temperatures. Field-induced magnetic ordering transition observed above $H_{c1}$ is attributed to the Bose-Einstein condensation of triplons in the sublattice formed by the $J_1$-$J_1'$ chains with weaker exchange couplings.
description: 14 pages, 14 figures
The quality of mercy: Organized animal protection in the United States, 1866--1930
Creators: name: Unti, Bernard Oreste
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 43
subject: History, heritage and archaeology
classificationCode: 4303
subject: Historical studies

description: Historians have largely neglected the animal protection movement, despite its unique accomplishments and its relationship to other reform efforts. While humane advocates in the pre-World War II era rarely transcended anthropocentrism, they launched significant initiatives to extend ethical concern beyond the species barrier. From 1866 onward, they waged campaigns against cruelty to animals in transportation, slaughter, education, entertainment, science, recreation, municipal animal control, and food and fur production. This study situates organized concern for animals in relation to other post-Civil War reforms---including temperance and child protection. It explains the rise of humane work in light of antebellum trends in law, education, philosophy, and religion, and the perception that animals were at the heart of many sanitary and public health concerns. It qualifies interpretations that reduce animal protection to an exercise in social control. It denies the importance of the Darwinian assertion that humans were animals to the movement's formation. Finally, it disputes claims that concern for animals served a "displacement" function until some human reforms became socially acceptable. As a result of humane education campaigns, the kindness-to-animals ethic gained recognition as an important element in character formation. However, just as humane advocates began to contest an unqualified anthropocentrism, new and unprecedented forms of animal use emerged. The movement proved ineffectual in the face of a broad "industrialization" of animals, and its progress slowed in the early years of the twentieth century. Animal protectionists found it difficult to advance their principles in such arenas as experimentation or food production, where exploitation of animals was expanding. In addition, targeted interests successfully placed many forms of animal use outside of socially and legally determined definitions of cruelty. With the rise of science- and social science-based reform, moreover, the humane movement fell out of step with once allied causes like feminism, temperance, and child protection. After 1920, the movement's agenda narrowed, and it focused its resources on municipal animal control. Even so, humane advocates set precedents upon which contemporary animal protectionists continue to build.
Bombus (Cullumanobombus) crotchii Cresson 1878
Creators: name: Pedro, Diego De
name: Ceccarelli, Fadia Sara
name: Sagot, Philippe
name: López-Reyes, Eulogio
name: Mullins, Jessica L.
name: Mérida-Rivas, Jorge A.
name: Falcon-Brindis, Armando
name: Griswold, Terry
name: Ascher, John S.
name: Gardner, Joel
name: Ayala, Ricardo
name: Vides-Borrell, Eric
name: Vandame, Rémy
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy

description: Bombus (Cullumanobombus) crotchii Cresson, 1878
[Lectotype: ANSP; ☿ California, USA; 1873]
Bombus crotchii is endemic to the CFP and is listed by IUCN as endangered with declining population sizes due to habitat loss and climate change (IUCN 2014). We reviewed historical specimens of this species vouchered at MABC, SDNHM, and CASC (Supplementary material 1). Additionally, the BBPT observed this species in the Coastal Sage Matorral in June 2018, 2020, and 2023. Based on information from historical samples and our observations, we expect this species is present in the Chaparral region as well. See fig. 84.
description: Published as part of Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric & Vandame, Rémy, 2024, Revealing the Baja California Peninsula's Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila), pp. 1-391 in Zootaxa 5522 (1) on page 144, DOI: 10.11646/zootaxa.5522.1.1, http://zenodo.org/record/13920532
Acqua, qual buon vento solare ti porta?
Creators: Gloria Nobile
Publisher: name: Media Inaf
Year: 2021

Gli attuali modelli della formazione della Terra suggeriscono che una parte dell’acqua e di altri composti volatili provenga da fonti esogene. Fra queste potrebbe esserci il vento solare, che avrebbe arricchito del prezioso liquido la superficie degli asteroidi, contribuendo così ad aumentarne la quantità. L’ipotesi è illustrata in uno studio, pubblicato oggi su Nature Astronomy, condotto in laboratorio sui frammenti dell’asteroide Itokawa
The Ages of Dwarf Ellipticals
Creators: name: Rakos, K.
name: Schombert, J.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present narrow band photometry of 91 dwarf ellipticals in the Coma and Fornax clusters taken through the Stromgren (uvby) filter system. Dividing the sample by dwarf morphology into nucleated (dEN) and non-nucleated (dE) dwarfs reveals two distinct populations of early-type systems based on integrated colors. The class of dEN galaxies are redder in their continuum colors as compared to bright cluster ellipticals and dE type dwarfs, and their position in multi-color diagrams can only be explained by an older mean age for their underlying stellar populations. By comparison with the narrow band photometry of the M87 globular cluster system (Jordan et al. 2002), we find that dENs are a higher metallicity continuation of the old, metal-poor color sequence of galactic globulars and the blue population of M87 globulars. Bright ellipticals and dE dwarfs, on the other hand, follow the color sequence of the metal-rich, red population of M87 globulars. A comparison to SED models, convolved to a simple metallicity model, finds that dENs and blue globulars are 3 to 4 Gyrs older than cluster ellipticals and 5 Gyrs older than dE type galaxies. The implication is that globulars and dEN galaxies are primordial and have metallicities set by external constraints such as the enrichment of their formation clouds. Bright ellipticals and dE galaxies have metallicities and ages that suggest an extended phase of initial star formation to produce a younger mean age, even if their formation epoch is similar to that of dENs and blue globulars, and an internally driven chemical evolutionary history.
description: 13 pages AAS LaTeX, 6 figures, accepted for publication in AJ
A fractionally cointegrated VAR analysis of economic voting and political support
Creators: name: Jones, Maggie E.C.
name: ÃŸrregaard Nielsen, Morten
name: Ksawery Popiel, Michal
name: Jones, Maggie E.C.
name: ÃŸrregaard Nielsen, Morten
name: Ksawery Popiel, Michal
Publisher: name: Unknown
Year: 2014
Subjects: subject: Financial Economics
subject: Political Economy
subject: Economic voting
subject: fractional cointegration
subject: political economy
subject: vector autoregressive model

description: We use a fractionally cointegrated vector autoregressive model to examine the relation- ship between Canadian political support and macroeconomic conditions. This model is well suited for the analysis because it allows multiple fractional time series and admits simple asymptotic inference for the model parameters and tests of the hypotheses of interest. In the long-run equilibrium, we find that support for the Progressive Conser- vative Party was higher during periods of high interest rates and low unemployment, while support for the Liberal Party was higher during periods of low interest rates and high unemployment. We also test and reject the notion that party support is driven only by relative (to the United States) economic performance. Indeed, our findings suggest that US macroeconomic variables do not enter the long-run equilibrium of Canadian economic voting (political opinion poll support) at all.
Improving western United States snow water equivalent (SWE) estimates from passive microwave sensors
Creators: name: Pitter, Shanna
name: Nolin, Anne
name: Dawson, Nancy
name: Cross, Susan
name: Rodriguez, Yasmin
Publisher: name: University Corporation For Atmospheric Research (UCAR)
Year: 2001
Subjects: Spatial estimates
Department of Agriculture
Snowpack telemetry
Linear regression
Pacific Northwest
Colorado

The purpose of this research is to improve spatial estimates of snow water equivalent (SWE) from passive microwave sensors. U.S. Department of Agriculture National Resources Conservation Service snowpack telemetry (SNOTEL) data are used as ground truth to improve the western U.S. SWE estimates from the Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR) and the U.S. Defense Meteorological Satellite Program Special Sensor Microwave/Imager (SSM/I). Predictive models are developed using simple linear regression between the satellite-derived SWE and SWE measured at the SNOTEL stations. The regressions are done using calibration and validation periods from the 1981â1999 water years. The calibration period is used to develop the regression and the validation period is used to test the regression model. The regions studied are the Pacific Northwest and Colorado. The regression equations for each region fit the data with R2 values ranging from .46 to .66, indicating that the models adequately predict observed SWE. The predictive models for Colorado are significantly better than the models developed for the Pacific Northwest. The best model is for Colorado with SMMR data. Differences in the fits of the models suggest regional differences in the data. When vegetation cover is examined, the Pacific Northwest exhibits a much higher percent tree cover than the Colorado region. Correlations between mean vegetation cover and maximum microwave SWE are negative, ranging from â0.32 to -0.63 for the Pacific Northwest, while in Colorado, the correlations are statistically insignificant. This suggests that vegetation impacts the accuracy of satellite-derived SWE.
Hessian metric via transport information geometry
Creators: name: Li, Wuchen
Publisher: name: arXiv
Year: 2020
Subjects: subject: Differential Geometry (math.DG)
subject: Information Theory (cs.IT)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We propose to study the Hessian metric of a functional on the space of probability measures endowed with the Wasserstein $2$-metric. We name it transport Hessian metric, which contains and extends the classical Wasserstein-$2$ metric. We formulate several dynamical systems associated with transport Hessian metrics. Several connections between transport Hessian metrics and mathematical physics equations are discovered. E.g., the transport Hessian gradient flow, including Newton's flow, formulates a mean-field kernel Stein variational gradient flow; The transport Hessian Hamiltonian flow of Boltzmann-Shannon entropy forms the Shallow water equation; The transport Hessian gradient flow of Fisher information leads to the heat equation. Several examples and closed-form solutions for transport Hessian distances are presented.
The quality of mercy: Organized animal protection in the United States, 1866--1930
Creators: name: Unti, Bernard Oreste
Publisher: name: American University
Year: 2023

description: Historians have largely neglected the animal protection movement, despite its unique accomplishments and its relationship to other reform efforts. While humane advocates in the pre-World War II era rarely transcended anthropocentrism, they launched significant initiatives to extend ethical concern beyond the species barrier. From 1866 onward, they waged campaigns against cruelty to animals in transportation, slaughter, education, entertainment, science, recreation, municipal animal control, and food and fur production. This study situates organized concern for animals in relation to other post-Civil War reforms---including temperance and child protection. It explains the rise of humane work in light of antebellum trends in law, education, philosophy, and religion, and the perception that animals were at the heart of many sanitary and public health concerns. It qualifies interpretations that reduce animal protection to an exercise in social control. It denies the importance of the Darwinian assertion that humans were animals to the movement's formation. Finally, it disputes claims that concern for animals served a "displacement" function until some human reforms became socially acceptable. As a result of humane education campaigns, the kindness-to-animals ethic gained recognition as an important element in character formation. However, just as humane advocates began to contest an unqualified anthropocentrism, new and unprecedented forms of animal use emerged. The movement proved ineffectual in the face of a broad "industrialization" of animals, and its progress slowed in the early years of the twentieth century. Animal protectionists found it difficult to advance their principles in such arenas as experimentation or food production, where exploitation of animals was expanding. In addition, targeted interests successfully placed many forms of animal use outside of socially and legally determined definitions of cruelty. With the rise of science- and social science-based reform, moreover, the humane movement fell out of step with once allied causes like feminism, temperance, and child protection. After 1920, the movement's agenda narrowed, and it focused its resources on municipal animal control. Even so, humane advocates set precedents upon which contemporary animal protectionists continue to build.
Audio Universo: spettacolo inclusivo al planetario
Creators: Ufficio stampa Inaf
Publisher: name: Media Inaf
Year: 2021

Suoni oltre alle immagini per permettere anche a non vedenti e ipovedenti di esplorare la volta celeste e il Sistema solare nel nuovo spettacolo presentato in anteprima il 3 dicembre nei planetari di Firenze, Palermo, Torino e, a Napoli, quello di Città della scienza in occasione della Giornata internazionale delle persone con disabilità, e il 4 dicembre a Cagliari. Lo spettacolo è stato prodotto dalle università inglesi di Newcastle e Portsmouth con la collaborazione di Anita Zanella dell’Inaf
Additional file 1 of Protocol for a mixed methods process evaluation of a hybrid implementation-effectiveness trial of a scaled-up whole-school physical activity program for adolescents: Physical Activity 4 Everyone (PA4E1)
Creators: name: Mclaughlin, Matthew
name: Duff, Jed
name: Sutherland, Rachel
name: Campbell, Elizabeth
name: Wolfenden, Luke
name: Wiggers, John
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Science Policy
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Cancer
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 1. SPIRIT 2013 checklist.
A fractionally cointegrated VAR model with deterministic trends and application to commodity futures markets
Creators: name: Dolatabadi, Sepideh
name: ÃŸrregaard Nielsen, Morten
name: Xu, Ke
name: Dolatabadi, Sepideh
name: ÃŸrregaard Nielsen, Morten
name: Xu, Ke
Publisher: name: Unknown
Year: 2015
Subjects: subject: Financial Economics
subject: backwardation
subject: contango
subject: deterministic trend
subject: fractional cointegration
subject: futures markets
subject: vector error correction model

description: We apply the fractionally cointegrated vector autoregressive (FCVAR) model to analyze the relationship between spot and futures prices in five commodity markets (aluminium, copper, lead, nickel, and zinc). To this end, we first extend the FCVAR model to accommodate de- terministic trends in the levels of the processes. The methodological contribution is to provide representation theory for the FCVAR model with deterministic trends, where we show that the presence of the deterministic trend in the process induces both restricted and unrestricted constant terms in the vector error correction model. The consequences for the cointegration rank test are also brie y discussed. In our empirical application we use the data from Figuerola- Ferretti and Gonzalo (2010), who conduct a similar analysis using the usual (non-fractional) cointegrated VAR model. The main conclusion from the empirical analysis is that, when using the FCVAR model, there is more support for the cointegration vector (1;-1)0 in the long-run equilibrium relationship between spot and futures prices, and hence less evidence of long-run backwardation, compared to the results from the non-fractional model. Specifically, we reject the hypothesis that the cointegration vector is (1;-1) using standard likelihood ratio tests only for the lead and nickel markets.
Observation of a node in the quantum oscillations induced by microwave radiation
Creators: name: Kovalev, Alexey E.
name: Zvyagin, Sergey A.
name: Bowers, Clifford R.
name: Reno, John L.
name: Simmons, Jerry A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The microwave induced magnetoresistance in GaAs/AlGaAs heterostructure was studied at temperatures below 1K and frequencies in the range of 150-400 GHz. A distinct node in the Shubnikov- de Haas oscillations, induced by the microwave radiation, is clearly observed. The node position coincides with the position of the cyclotron resonance on the carriers with effective mass (0.068 +/- 0.005) m0.
description: to be published in Solid State Communications
Tinotus indicus Cameron 1939
Creators: name: Hanley, Rodney S.
Publisher: name: Zenodo
Year: 2002
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Tinotus
Tinotus indicus

description: Tinotus indicus Cameron
 Tinotus indicus Cameron, 1939:557 [description].
 Lectotype. BMNH, sex? [‘‘Chakrata Dist., Konain, 80009’’ / ‘‘Dr. Cameron, 24–30.V.22’’ / ‘‘ T. indicus Cam., TYPE’’ / ‘‘M. Cameron Bequest. B.M. 1955– 147’’ / ‘‘Lectotype’’ (white disc with purple border) / ‘‘ LECTOTYPE, Tinotus indicus Cameron, desig. R. S. Hanley 2000’’] (here designated). Lectotype designation is justified under article 74.1.1 of the ICZN (1999) in order to fix the status of this specimen as the sole name­bearing type of this species.
 Type Locality. INDIA: Uttar Pradesh, Chakrata Dist., Konain, 8,000 ft.
description: Published as part of Hanley, Rodney S., 2002, A New Species Of Mexican Tinotus From The Refuse Piles Of Atta Ants, Including An Annotated World Catalog Of Tinotus (Coleoptera: Staphylinidae: Aleocharinae: Aleocharini), pp. 453-471 in The Coleopterists Bulletin 56 (4) on page 462, DOI: 10.1649/0010-065X(2002)056[0453:ANSOMT]2.0.CO;2, http://zenodo.org/record/4900473
Optical Communication Noise Rejection Using Correlated Photons
Creators: name: Jackson, Deborah J.
name: Hockney, George M.
name: Dowling, Jonathan P.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: This paper describes a completely new way to perform noise rejection using a two-photon sensitive detector and taking advantage of the properties of correlated photons to improve an optical communications link in the presence of uncorrelated noise. In particular, a detailed analysis is made of the case where a classical link would be saturated by an intense background, such as when a satellite is in front of the sun,and identifies a regime where the quantum correlating system has superior performance.
description: 12 pages, 1 figure, 1 table
Bombus (Pyrobombus) vosnesenskii Radoszkowski 1862
Creators: name: Pedro, Diego De
name: Ceccarelli, Fadia Sara
name: Sagot, Philippe
name: López-Reyes, Eulogio
name: Mullins, Jessica L.
name: Mérida-Rivas, Jorge A.
name: Falcon-Brindis, Armando
name: Griswold, Terry
name: Ascher, John S.
name: Gardner, Joel
name: Ayala, Ricardo
name: Vides-Borrell, Eric
name: Vandame, Rémy
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy

description: Bombus (Pyrobombus) vosnesenskii Radoszkowski, 1862
[Type: ZISP; ♂ California; USA]
The range of Bombus vosnesenskii is restricted to the west coast of North America, primarily in the CFP (Williams et al. 2014). Despite the abundance of this species along the west coast of North America, it is infrequently observed on the BCP. In BC, B. vosnesenskii occurs within the Coastal Sage Matorral, Chaparral, and the Baja California Mountains. Historical records can be found at BBSL, EMEC, UCRC (GBIF 2023). ECOAB team collected 23 females in the Chaparral and Baja California Mountains in July 2013. Additionally, the BBPT collected this species in the Coastal Sage Matorral in November 2013, June 2020, and April 2021 (7 ♀). Voucher specimens are in MABC (4 ♀), and ECOAB (3 ♀). See fig. 84.
description: Published as part of Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric & Vandame, Rémy, 2024, Revealing the Baja California Peninsula's Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila), pp. 1-391 in Zootaxa 5522 (1) on page 144, DOI: 10.11646/zootaxa.5522.1.1, http://zenodo.org/record/13920532
Ultra High Energy Cosmic Rays and de Sitter Vacua
Creators: name: Alberghi, Gian Luigi
name: Goldstein, Kevin
name: Lowe, David A.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The production of ultra high-energy cosmic rays in de Sitter invariant vacuum states is considered. Assuming the present-day universe is asymptoting toward a future de Sitter phase, we argue the observed flux of cosmic rays places a bound on the parameter $α$ that characterizes these de Sitter invariant vacuum states, generalizing earlier work of Starobinsky and Tkachev. If this bound is saturated, we obtain a new top-down scenario for the production of super-GZK cosmic rays. The observable predictions bear many similarities to the previously studied scenario where super-GZK events are produced by decay of galactic halo super-heavy dark matter particles.
description: 10 pages, revtex4
The impact of college students' cultural and historical awareness on their perceived mathematics self-efficacy, motivation and achievement
Creators: name: Wicker, Whiting John
Publisher: name: American University
Year: 2023

description: This study assesses the impact of college students' cultural and historical awareness on their perceived mathematics self-efficacy, motivation and achievement. Their writing a term or discussion paper about mathematics from a cultural or historical perspective served as the primary medium upon which they based any changes in their reported levels of these self-concepts. Students in several freshman- and sophomore-level mathematics courses at American University were targeted for inclusion in this study during the Spring 2001 semester. Approximately 350 identical questionnaires were distributed, one to each student, that requested each recipient to voluntarily answer questions about his or her views on mathematics, with emphasis on cultural and historical aspects. Sixty-six students responded to the questionnaire, with 42 stating that they wished to write such a paper. Twenty ultimately did so and were interviewed about their views on mathematics. The response data indicate that students writing such a paper might improve their perceived mathematics self-efficacy, motivation or achievement, although the results are mixed: student transactional writing on mathematics from a cultural or historical perspective positively affects some students, but not others, with respect to these self-concepts. Some felt more comfortable with being able to do mathematics after writing a paper than before. Some felt that writing a paper increased their motivation to succeed in mathematics. Few felt that writing a paper positively impacted their perceived mathematics achievement. Some held mixed perceived mathematics self-concepts. The issue of parental involvement in students' mathematics education surfaced as a major mathematics motivational factor among those interviewees who are not United States nationals. Perhaps parents of mathematics students in the United States can learn from their counterparts in other countries in order to improve their children's mathematics education. Another factor was how students perceived the effectiveness of their mathematics teacher. Perhaps all mathematics teachers should become more cognizant of their students' perceptions in order to teach mathematics more effectively. Maybe more students will come to enjoy mathematics if they were to write such a paper, or maybe not. Nevertheless, many discovered that mathematics need not be viewed as just a collection of sterile facts and figures.
A fractionally cointegrated VAR analysis of price discovery in commodity futures markets
Creators: name: Dolatabadi, Sepideh
name: ÃŸrregaard Nielsen, Morten
name: Xu, Ke
name: Dolatabadi, Sepideh
name: ÃŸrregaard Nielsen, Morten
name: Xu, Ke
Publisher: name: Unknown
Year: 2014
Subjects: subject: Financial Economics
subject: fractional cointegration
subject: futures markets
subject: price discovery
subject: vector error correction model

description: In this paper we apply the recently developed fractionally cointegrated vector autoregressive (FCVAR) model to analyze price discovery in the spot and futures markets for five non-ferrous metals (aluminium, copper, lead, nickel, and zinc). The FCVAR model allows for long memory (fractional integration) in the equilibrium errors, and, following Figuerola-Ferretti and Gonzalo (2010), we allow for the existence of long-run backwardation or contango in the equilibrium as well, i.e. a non-unit cointegration coeffcient. Price discovery can be analyzed in the FCVAR model by a relatively straightforward examination of the adjustment coeffcients. In our empiri- cal analysis we use the data from Figuerola-Ferretti and Gonzalo (2010), who conduct a similar analysis using the usual (non-fractional) CVAR model. Our first finding is that, for all markets except copper, the fractional integration parameter is highly significant, showing that the usual, non-fractional model is not appropriate. Next, when allowing for fractional integration in the long-run equilibrium relations, fewer lags are needed in the autoregressive formulation, further stressing the usefulness of the fractional model. Compared to the results from the non-fractional model, we find slightly more evidence of price discovery in the spot market. Specifically, using standard likelihood ratio tests, we do not reject the hypothesis that price discovery takes place exclusively in the spot (futures) market for copper, lead, and zinc (aluminium and nickel).
StarBlast: esplosioni stellari in realtà virtuale 
Creators: Redazione Media Inaf
Publisher: name: Media Inaf
Year: 2021

È stata rilasciata una nuova applicazione dalle ampie potenzialità divulgative e didattiche che mostra la struttura dei resti di supernova e delle pulsar wind nebula più studiate, in realtà virtuale. Il progetto, finanziato dalla cost-action Pharos, è stato guidato dall’Inaf di Palermo e dall’Università di Palermo, in collaborazione con Ceformed srl. In questo articolo, tutti i dettagli per scaricarla
The impact of college students' cultural and historical awareness on their perceived mathematics self-efficacy, motivation and achievement
Creators: name: Wicker, Whiting John
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3901
subject: Curriculum and pedagogy
classificationCode: 3904
subject: Specialist studies in education

description: This study assesses the impact of college students' cultural and historical awareness on their perceived mathematics self-efficacy, motivation and achievement. Their writing a term or discussion paper about mathematics from a cultural or historical perspective served as the primary medium upon which they based any changes in their reported levels of these self-concepts. Students in several freshman- and sophomore-level mathematics courses at American University were targeted for inclusion in this study during the Spring 2001 semester. Approximately 350 identical questionnaires were distributed, one to each student, that requested each recipient to voluntarily answer questions about his or her views on mathematics, with emphasis on cultural and historical aspects. Sixty-six students responded to the questionnaire, with 42 stating that they wished to write such a paper. Twenty ultimately did so and were interviewed about their views on mathematics. The response data indicate that students writing such a paper might improve their perceived mathematics self-efficacy, motivation or achievement, although the results are mixed: student transactional writing on mathematics from a cultural or historical perspective positively affects some students, but not others, with respect to these self-concepts. Some felt more comfortable with being able to do mathematics after writing a paper than before. Some felt that writing a paper increased their motivation to succeed in mathematics. Few felt that writing a paper positively impacted their perceived mathematics achievement. Some held mixed perceived mathematics self-concepts. The issue of parental involvement in students' mathematics education surfaced as a major mathematics motivational factor among those interviewees who are not United States nationals. Perhaps parents of mathematics students in the United States can learn from their counterparts in other countries in order to improve their children's mathematics education. Another factor was how students perceived the effectiveness of their mathematics teacher. Perhaps all mathematics teachers should become more cognizant of their students' perceptions in order to teach mathematics more effectively. Maybe more students will come to enjoy mathematics if they were to write such a paper, or maybe not. Nevertheless, many discovered that mathematics need not be viewed as just a collection of sterile facts and figures.
Galassia satellite? No, sono solo di passaggio
Creators: Valentina Guglielmo
Publisher: name: Media Inaf
Year: 2021

Molte delle galassie che “orbitano” intorno alla Via Lattea non sono satelliti, ma solo di passaggio e, forse, non rimarranno mai intrappolate nel campo gravitazionale della nostra galassia. A rivelarlo, le precisissime misure di velocità del telescopio spaziale Gaia
Wild cluster bootstrap confidence intervals
Creators: name: MacKinnon, James G.
name: MacKinnon, James G.
Publisher: name: Unknown
Year: 2014
Subjects: Financial Economics

description: Confidence intervals based on cluster-robust covariance matrices can be constructed in many ways. In addition to conventional intervals obtained by inverting Wald (t) tests, the paper studies intervals obtained by inverting LM tests, studentized bootstrap intervals based on the wild cluster bootstrap, and restricted bootstrap intervals obtained by inverting bootstrap Wald and LM tests. It also studies the choice of an auxiliary distribution for the wild bootstrap, a modified covariance matrix based on transforming the residuals that was proposed some years ago, and new wild bootstrap procedures based on the same idea. Some procedures perform extraordinarily well even when the number of clusters is small.
Exploring the impact and process of merit pay for public school teachers
Creators: name: Zhang, Xiaodong
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3902
subject: Education policy, sociology and philosophy

description: Merit pay for public school teachers has been one of the most controversial educational policies in the US. Built on the free market principle, it is designed to reward teachers according to their performance and hence improve the quality of education they provide to students. Nevertheless, merit pay experiments seldom appear to be successful in schools. Notwithstanding the controversies and amount of dollars invested, there have been few systematic studies on the impact of such policies on student achievement and the conclusions come largely from reviews of the staying power of merit pay systems. This dissertation examines the impact of merit pay on student achievement with a three-prong approach, using both quantitative and qualitative methods. The first design, using national data from the Schools and Staffing Survey (1987--88), looks at the effect of merit pay on student college application rate and graduation rate. The second design, using panel data from Fairfax County Public Schools (FCPS), Virginia (1989--1996), examines how merit pay plans affect students' standardized test scores. The results suggest that merit pay has little, and sometimes even negative effect on student achievement. In addition, the study verifies that students' socio-economic status, class size and teacher education, each in its own way, have significant impact on student performance while the influence from teacher experience is often insignificant. The third prong of the dissertation is a case study of the merit pay experiment in the FCPS. It aims to uncover the "black box" of policy design and implementation by tracing the actions and interactions of major players in the process. The case study finds that the rise and fall of merit pay does not depend on whether it achieves its intended outcomes, but rather the changing political and economic support of such policy. The study provides insights on why merit pay doesn't work. The marginal productivity theory that merit pay is based on is flawed and cannot be applied to schools where outcomes rely on multiple factors. Implementation of merit pay plans that depend on excessive measurement and considerable financial investment also creates resource problems that make most programs short-lived. Finally, cyclical returns of merit pay simply reflect the frustration that effective means to improve student achievement remain illusive to educators and policymakers. The study discusses the implications of merit pay on recent developments in teacher compensation such as the national board certification and school-based incentives. While it indicates some of the promising aspects of the school-based incentives, it cautions that compensation reform is not a magic elixir that will cure all of education's ills and that any compensation reform must be accompanied with other reforms in instruction and management.
Mass renormalization in nonrelativistic QED
Creators: name: Hiroshima, Fumio
name: Spohn, Herbert
Publisher: name: arXiv
Year: 2003
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: Q81

description: In nonrelativistic QED the charge of an electron equals its bare value, whereas the self-energy and the mass have to be renormalized. In our contribution we study perturbative mass renormalization, including second order in the fine structure constant $α$, in the case of a single, spinless electron. As well known, if $m$ denotes the bare mass and $\mass$ the mass computed from the theory, to order $α$ one has $$\frac{\mass}{m} =1+\frac{8α}{3π} \log(1+\half (Λ/m))+O(α^2)$$ which suggests that $\mass/m=(Λ/m)^{8α/3π}$ for small $α$. If correct, in order $α^2$ the leading term should be $\displaystyle \half ((8α/3π)\log(Λ/m))^2$. To check this point we expand $\mass/m$ to order $α^2$. The result is $\sqrt{Λ/m}$ as leading term, suggesting a more complicated dependence of $m_{\mathrm{eff}}$ on $m$.
A Matlab program and user’s guide for the fractionally cointegrated VAR model
Creators: name: ÃŸrregaard Nielsen, Morten
name: Ksawery Popiel, MichaÅC
name: ÃŸrregaard Nielsen, Morten
name: Ksawery Popiel, MichaÅC
Publisher: name: Unknown
Year: 2018
Subjects: subject: Financial Economics
subject: Research and Development/Tech Change/Emerging Technologies
subject: cofractional process
subject: cointegration rank
subject: computer program
subject: fractional autoregressive model
subject: fractional cointegration
subject: fractional unit root
subject: Matlab
subject: VAR model

description: This manual describes the usage of the accompanying freely available Matlab program for estimation and testing in the fractionally cointegrated vector autoregressive (FCVAR) model. This program replaces an earlier Matlab program by Nielsen and Morin (2014), and although the present Matlab program is not compatible with the earlier one, we encourage use of the new program.
Non-full rank bound entangled states satisfying the range criterion
Creators: name: Bandyopadhyay, Somshubhro
name: Ghosh, Sibasish
name: Roychowdhury, Vwani
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A systematic method for generating bound entangled states in any bipartite system, with ranks ranging from five to full rank, is presented. These states are constructed by mixing separable states with UPB (Unextendible Product Basis) - generated PPT bound entangled states. A subset of this class of PPT bound entangled states, having less than full rank, is shown to satisfy the range criterion [Phys. Lett. A, vol. 232 (1997) 333].
description: 6 pages, Latex. Minor corrections and additions. More references added. Accepted for publication in Phys. Rev. A
Oddity in nonrelativistic, strong gravity
Creators: name: Ergen, Mert
name: Hamamci, Efe
name: Bleeken, Dieter Van den
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the presence of odd powers of the speed of light $c$ in the covariant nonrelativistic expansion of General Relativity (GR). The term of order $c$ in the relativistic metric is a vector potential that contributes at leading order in this expansion and describes strong gravitational effects outside the (post-)Newtonian regime. The nonrelativistic theory of the leading order potentials contains the full non-linear dynamics of the stationary sector of GR.
description: 24 pages + appendices. Version accepted for publication by EPJC. Subsection 4.4 on possible phenomenological applications added
Knot adjacency, genus and essential tori
Creators: name: Kalfagianni, Efstratia
name: Lin, Xiao-Song
Publisher: name: arXiv
Year: 2004
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: A knot K is called n-adjacent to another knot K', if K admits a projection containing n generalized crossings such that changing any 0 < m \leq n of them yields a projection of K'. We apply techniques from the theory of sutured 3-manifolds, Dehn surgery and the theory of geometric structures of 3-manifolds to answer the question of the extent to which non-isotopic knots can be adjacent to each other. A consequence of our main result is that if K is n-adjacent to K' for all n, then K and K' are isotopic. This provides a partial verification of the conjecture of V. Vassiliev that the finite type knot invariants distinguish all knots. We also show that if no twist about a crossing circle L of a knot K changes the isotopy class of K, then L bounds a disc in the complement of K. This gives a characterization of the nugatory crossings of a knot.
description: 32 pages, 4 Figures. This version will appear in the Pacific J. of Math. The appendix by Darryl McCullough is now a separate publication. Section on fibered knots is removed; the results in there will appear in a separate publication