cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Women's paid employment, households, and export -processing manufacturing in northern Mexico
Creators: name: Peschiera De Fort, Lucia
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 44
subject: Human society
classificationCode: 4405
subject: Gender studies
classificationCode: 4410
subject: Sociology
subject: FOS: Sociology

description: This dissertation investigates the decision-making by low-income women workers in Ciudad Juarez, Mexico, to enter employment in the export-processing sector. The data were collected as part of a survey of 1246 women workers in, conducted in 1991, where a probability sample of 572 maquila workers was interviewed using a structured questionnaire. This study focuses on a sub-sample of 372 maquila workers between the ages of 16 and 30 who had worked in the maquilas less than four years. Two questions guided the research: (1) How do low-income women workers of Ciudad Juarez, Mexico, account for their decision to enter export-processing employment? and (2) How are these accounts shaped by variations in (1) whom they talked with their interlocutors, (2) household composition and economic well being, and (3) the women's own characteristics?; The workers' accounts, at the time of the interview, comprised who they spoke to and what they talked about when they decided to enter maquila employment. Content analysis and statistical tests (x2 and t-test) were used to explore the relationship among (1) household category and economic well being, (2) workers' characteristics, and (3) workers' motives and decision, and to identify which factors most influenced the decision. The workers' accounts revealed that the most common motives were family or personal economic needs, as well as personal improvement needs; work and working conditions however, was the most common discussion topic. Workers' age and position within the household had the greatest effect on motives or topics discussed, but their effect is mediated by whom they talked with. Gender and generational differences within households also had an influence. Younger, single workers, living with their parents were more likely to discuss their own needs or ask for permission; older, married workers focused more on family economic needs; and those living in same generation households were most likely to discuss working conditions. Workers' accounts also reveal a fairly egalitarian and cooperative decision-making, focused primarily on the workers' needs. They also reveal a strong gender division within the household, since most workers spoke to other women, particularly their mothers.
Bootstrap tests for overidentification in linear regression models
Creators: name: Davidson, Russell
name: MacKinnon, James G.
name: Davidson, Russell
name: MacKinnon, James G.
Publisher: name: Unknown
Year: 2014
Subjects: Financial Economics

description: Little attention has been paid to the nite-sample properties of tests for overidentifying restrictions in linear regression models with a single endogenous regressor and weak instruments. We study several such tests in models estimated by instrumental variables (IV) and limited-information maximum likelihood (LIML). Under the assumption of Gaussian disturbances, we derive expressions for a variety of test statistics as functions of eight mutually independent random variables and two nuisance parameters. The distributions of the statistics are shown to have an ill-dened limit as the parameter that determines the strength of the instruments tends to zero and as the correlation between the disturbances of the structural and reduced-form equations tends to plus or minus one. Simulation experiments demonstrate that this makes it impossible to perform reliable inference near the point at which the limit is ill-dened. Several bootstrap procedures are proposed. They alleviate the problem and allow reliable inference when the instruments are not too weak. We also study the power properties of the bootstrap tests.
String bit models of two-dimensional quantum gravity coupled with matter
Creators: name: Lee, C. -W. H.
name: Mann, R. B.
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We extend the formalism of Hamiltonian string bit models of quantum gravity type in two spacetime dimensions to include couplings to particles. We find that the single-particle closed and open universe models respectively behave like empty open and closed universes, and that a system of two distinguishable particles in a closed universe behaves like an empty closed universe. We then construct a metamodel that contains all such models, and find that its transition amplitude is exactly the same as the sl(2) gravity model.
description: 24 pages, LaTeX2e; typos corrected, references added
A generalized Abhyankar's conjecture for simple Lie algebras in characteristic $p>5$
Creators: name: Otabe, Shusuke
name: Tonini, Fabio
name: Zhang, Lei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: In the present paper, we study a purely inseparable counterpart of Abhyankar's conjecture for the affine line in positive characteristic, and prove its validity for all the finite local non-abelian simple group schemes in characteristic $p>5$. The crucial point is how to deal with finite local group schemes which cannot be realized as the Frobenius kernel of a smooth algebraic group. Such group schemes appear as the ones associated with Cartan type Lie algebras. We settle the problem for such Lie algebras by making use of natural gradations or filtrations on them.
Anthophora (Micranthophora) columbariae Timberlake & Cockerell 1937
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: Anthophora (Micranthophora) columbariae Timberlake & Cockerell, 1937
[Holotype: AMNH; ♂ Morongo, California; April 20–22, 1937]
This species is distributed in the CFP and the SD and the Mojave Desert ecoregions. In BC, it has been collected in the Succulent Coastal Matorral, Chaparral, and Baja California Mountains regions within the CFP, as well as in the Central Desert of the SD (Orr et al. 2018). BBSL reports four specimens collected in the Central Desert in 1985 (GBIF 2023). Additionally, the BBPT collected this species in May of 2021 and 2022, as well as in April of 2023 (Supplementary material 1). See fig. 72.
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 129, DOI: 10.11646/zootaxa.5522.1.1, http://zenodo.org/record/13920532
Quale di queste due scie è una cometa?
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2021

L’Apod (Astronomy Picture of the Day) della Nasa di oggi è molto particolare: il cielo stellato di una notte thailandese, nel quale sono visibili due scie che sembrano le code di altrettante comete. Ma solo una delle due lo è, mentre l’altra è l’ultima traccia visibile lasciata dal razzo Ariane V che si sta allontanando dalla terra, con a bordo un carico davvero prezioso: il telescopio spaziale James Webb
Hypothesis Testing for Arbitrary Bounds
Creators: name: Penney, Jeffrey
name: Penney, Jeffrey
Publisher: name: Unknown
Year: 2013
Subjects: subject: Financial Economics
subject: Research Methods/ Statistical Methods
subject: familywise error
subject: multiple testing
subject: null effect
subject: partial identification
subject: precise zero

description: I derive a rigorous method to help determine whether a true parameter takes a value between two arbitrarily chosen points for a given level of confidence via a multiple testing procedure which strongly controls the familywise error rate. For any test size, the distance between the upper and lower bounds can be made smaller than that created by a confidence interval. The procedure is more powerful than other multiple testing methods that test the same hypothesis. This test can be used to provide an affrmative answer about the existence of a negligible effect.
Anthophora (Micranthophora) curta Provancher 1895
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: Anthophora (Micranthophora) curta Provancher, 1895
[Lectotype: ULQC; ♀ Los Angeles, California, USA]
Anthophora curta is widely distributed in the southwestern USA and northern Mexico (Orr et al. 2018), and is one of the most abundant bee species of the BCP. This species specializes on the pollen from a broad number of hosts in the family Asteraceae (Orr et al. 2018). Preserved specimens from the BCP are vouchered in many collections including: BBSL, LACM, CSCA, CASC, SEMC, ASUHIC, TAMU (GBIF 2023; SCAN 2023). We examined 16 specimens (9 ♀, 7 ♂) from CASC. This species has been recorded in all ecoregions of the BCP during this project fieldwork with a wide foraging season from March to November and specimens are vouchered at MABC, and ECOAB (Supplementary material 1). See fig. 72.
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 129, DOI: 10.11646/zootaxa.5522.1.1, http://zenodo.org/record/13920532
Women's paid employment, households, and export -processing manufacturing in northern Mexico
Creators: name: Peschiera De Fort, Lucia
Publisher: name: American University
Year: 2023

description: This dissertation investigates the decision-making by low-income women workers in Ciudad Juarez, Mexico, to enter employment in the export-processing sector. The data were collected as part of a survey of 1246 women workers in, conducted in 1991, where a probability sample of 572 maquila workers was interviewed using a structured questionnaire. This study focuses on a sub-sample of 372 maquila workers between the ages of 16 and 30 who had worked in the maquilas less than four years. Two questions guided the research: (1) How do low-income women workers of Ciudad Juarez, Mexico, account for their decision to enter export-processing employment? and (2) How are these accounts shaped by variations in (1) whom they talked with their interlocutors, (2) household composition and economic well being, and (3) the women's own characteristics?; The workers' accounts, at the time of the interview, comprised who they spoke to and what they talked about when they decided to enter maquila employment. Content analysis and statistical tests (x2 and t-test) were used to explore the relationship among (1) household category and economic well being, (2) workers' characteristics, and (3) workers' motives and decision, and to identify which factors most influenced the decision. The workers' accounts revealed that the most common motives were family or personal economic needs, as well as personal improvement needs; work and working conditions however, was the most common discussion topic. Workers' age and position within the household had the greatest effect on motives or topics discussed, but their effect is mediated by whom they talked with. Gender and generational differences within households also had an influence. Younger, single workers, living with their parents were more likely to discuss their own needs or ask for permission; older, married workers focused more on family economic needs; and those living in same generation households were most likely to discuss working conditions. Workers' accounts also reveal a fairly egalitarian and cooperative decision-making, focused primarily on the workers' needs. They also reveal a strong gender division within the household, since most workers spoke to other women, particularly their mothers.
A comparative study of post-secondary Equine Studies programs in the United States with that of the Deutsche Reitschule in Germany
Creators: name: Morris, Marsha Carol
Publisher: name: American University
Year: 2023

description: This study compared and contrasted twenty-two post-secondary Equine Studies programs leading to a baccalaureate degree in the United States, as listed in the 1995 College Board Index of Majors and Graduate Degrees, with the prototypal equine program of the Deutsche Reitschule in Germany, in terms of five programmatic components, and offered inferences to account for found differences between both programs. The American schools considered represent a comprehensive grouping of four-year institutions. The Deutsche Reitschule [National Riding School] was utilized as the prototype program because of its established reputation developed over centuries in preparing instructors and standardized foundations in the equestrian arts. The five programmatic components used as comparative criteria were: (1) Curriculum, (2) Faculty, (3) Student, (4) Academic Resources and (5) Special Resources. Data used to address three research questions were obtained from institutional catalogs and a questionnaire with the cultural and societal norms as they relate to the equestrian arts in both countries. A recommendation is for administered to the director of each Equine Studies program in March, 1995. Data were then examined from an analytical perspective to identify similarities and differences among American schools, and between those institutions considered in aggregate, and the Deutsche Reitschule. It was found that Equine Studies programs in the American schools aimed the educative process toward both career- (work place) and knowledge- (preparation for personal and civic life) oriented ends, but differed widely on the importance of each, as well as, on the distribution of coursework required for a degree among major, minor, general education and elective areas. No program required more than minimal field experience. Conversely, the German program aimed solely toward preparation for a narrow field of work, with coursework only in the major (equine) area. It emphasized extensive field experience. Programs in America tend to draw female students and female faculty, whereas, the reverse was found at the Deutsche Reitschule. It was concluded that these differences are consistent with the cultural and societal norms as they relate to the equestrian arts in both countries. A recommendation is for student exchange in equine studies to be established between American institutions and the Deutsche Reitschule.
The Cayley trick and triangulations of products of simplices
Creators: name: Santos, Francisco
Publisher: name: arXiv
Year: 2003
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 52B20; 52B11

description: We use the Cayley Trick to study polyhedral subdivisions of the product of two simplices. For arbitrary (fixed) $l$, we show that the numbers of regular and non-regular triangulations of $Δ^l\timesΔ^k$ grow, respectively, as $k^{Θ(k)}$ and $2^{Ω(k^2)}$. For the special case of $l=2$, we relate triangulations to certain class of lozenge tilings. This allows us to compute the exact number of triangulations up to $k=15$, show that the number grows as $e^{βk^2/2 + o(k^2)}$ where $β\simeq 0.32309594$ and prove that the set of all triangulations is connected under geometric bistellar flips. The latter has as a corollary that the toric Hilbert scheme of the determinantal ideal of $2\times 2$ minors of a $3\times k$ matrix is connected, for every $k$. We include ``Cayley Trick pictures'' of all the triangulations of $Δ^2\times Δ^2$ and $Δ^2\times Δ^3$, as well as one non-regular triangulation of $Δ^2\times Δ^5$ and one of $Δ^3\times Δ^3$.
description: This version has been accepted in "Proceedings of the Joint Summer Research Conference on Integer Points in Polyhedra" (Barvinok et al., eds.) Contemporary Mathematics, American Mathematical Society. Changes from v2: corrected a LaTeX problem with figures. Changes from v1: (1) some rephrasing, especially in the introduction. (2) the former proof of Theorem 5.4 was incorrect. The bound in the statement has been changed to match the new proof
Leveraging Photogrammetric Mesh Models for Aerial-Ground Feature Point Matching Toward Integrated 3D Reconstruction
Creators: name: Zhu, Qing
name: Wang, Zhendong
name: Hu, Han
name: Xie, Linfu
name: Ge, Xuming
name: Zhang, Yeting
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Integration of aerial and ground images has been proved as an efficient approach to enhance the surface reconstruction in urban environments. However, as the first step, the feature point matching between aerial and ground images is remarkably difficult, due to the large differences in viewpoint and illumination conditions. Previous studies based on geometry-aware image rectification have alleviated this problem, but the performance and convenience of this strategy is limited by several flaws, e.g. quadratic image pairs, segregated extraction of descriptors and occlusions. To address these problems, we propose a novel approach: leveraging photogrammetric mesh models for aerial-ground image matching. The methods of this proposed approach have linear time complexity with regard to the number of images, can explicitly handle low overlap using multi-view images and can be directly injected into off-the-shelf structure-from-motion (SfM) and multi-view stereo (MVS) solutions. First, aerial and ground images are reconstructed separately and initially co-registered through weak georeferencing data. Second, aerial models are rendered to the initial ground views, in which the color, depth and normal images are obtained. Then, the synthesized color images and the corresponding ground images are matched by comparing the descriptors, filtered by local geometrical information, and then propagated to the aerial views using depth images and patch-based matching. Experimental evaluations using various datasets confirm the superior performance of the proposed methods in aerial-ground image matching. In addition, incorporation of the existing SfM and MVS solutions into these methods enables more complete and accurate models to be directly obtained.
description: Accepted for publication in ISPRS Journal of Photogrammetry and Remote Sensing
Il telescopio spaziale James Webb è in volo
Creators: Ufficio stampa Inaf
Publisher: name: Media Inaf
Year: 2021

Nelle osservazioni scientifiche selezionate per il primo anno di attività del telescopio spaziale James Webb – il più grande mai costruito – sono coinvolti numerosi ricercatori e ricercatrici in Italia, molti di loro in forza all'Istituto nazionale di astrofisica, per un totale di oltre 1500 ore di tempo osservativo. Il commento del presidente Inaf, Marco Tavani
Singularity categories via the derived quotient
Creators: name: Booth, Matt
Publisher: name: arXiv
Year: 2020
Subjects: subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 14B05 (Primary), 16S38, 16E45, 18E30, 14A22, 16E35, 16G50 (Secondary)

description: Given a noncommutative partial resolution $A=\mathrm{End}_R(R\oplus M)$ of a Gorenstein singularity $R$, we show that the relative singularity category $Δ_R(A)$ of Kalck-Yang is controlled by a certain connective dga $A/^{\mathbb{L}}\kern -2pt AeA$, the derived quotient of Braun-Chuang-Lazarev. We think of $A/^{\mathbb{L}}\kern -2pt AeA$ as a kind of `derived exceptional locus' of the partial resolution $A$, as we show that it can be thought of as the universal dga fitting into a suitable recollement. This theoretical result has geometric consequences. When $R$ is an isolated hypersurface singularity, it follows that the singularity category $D_\mathrm{sg}(R)$ is determined completely by $A/^{\mathbb{L}}\kern -2pt AeA$, even when $A$ has infinite global dimension. Thus our derived contraction algebra classifies threefold flops, even those $X \to \mathrm{Spec} (R)$ where $X$ has only terminal singularities. This gives a solution to the strongest form of the derived Donovan-Wemyss conjecture, which we further show is the best possible classification result in this singular setting.
description: 46 pages. This is an improvement of the second half of arXiv:1810.10060, split off for publication. v2: proof of 6.4.6 improved, other minor refinements. To appear in Advances in Mathematics. v3: error in published version corrected, see http://mattbooth.info/papers/singcats-errata.pdf for the full errata
Astronomia creativa per ogni occasione
Creators: Claudia Mignone
Publisher: name: Media Inaf
Year: 2021

Non solo scoperte e pubblicazioni scientifiche: dai dati astronomici sbocciano anche prodotti di design, accessori a tema spaziale e una moda cosmica che sta prendendo piede tra scienziati e non in giro per il mondo. Tutto rigorosamente in scala e con la massima accuratezza scientifica, si intende. Scopriamo come e perché attraverso una serie di esperienze che ci porteranno dall'Europa agli Stati Uniti
Additional file 1 of Population dynamics, pathogen detection and insecticide resistance of mosquito and sand fly in refugee camps, Greece
Creators: name: Fotakis, Emmanouil Alexandros
name: Giantsis, Ioannis Apostolou
name: Sierra, Javier Castells
name: Filianna Tanti
name: Balaska, Sofia
name: Mavridis, Konstantinos
name: Kourtidis, Sofoklis
name: Vontas, John
name: Chaskopoulou, Alexandra
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: Cancer
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: 60506 Virology
subject: Computational Biology

description: Additional file 1: Table S1. VGSC-1014 genotype and kdr mutation 1014F allele frequency in Culex pipiens populations in the study refugee camps.
Anthophora (Micranthophora) erythrothorax Michener 1936
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: Anthophora (Micranthophora) erythrothorax Michener, 1936 **
[Holotype: CASC; ♀ Mill Creek, San Bernardino Mountains, California, USA; August 31, 1930]
This species occurs in the CPF and rarely in Mojave and SDs. It specializes on pollen from a broad range of genera in the family Asteraceae (Orr et al. 2018). It is a new record for both Mexico and BC based on a single female collected in the Chaparral in October 2020. See fig. 73.
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 130, DOI: 10.11646/zootaxa.5522.1.1, http://zenodo.org/record/13920532
Algebraic Geometry Realization of Quantum Hall Soliton
Creators: name: Abounasr, R.
name: Haddou, M. Ait Ben
name: Rhalami, A. El
name: Saidi, E. H.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using Iqbal-Netzike-Vafa dictionary giving the correspondence between the H$_{2}$ homology of del Pezzo surfaces and p-branes, we develop a new way to approach system of brane bounds in M-theory on $\mathbb{S}^{1}$. We first review the structure of ten dimensional quantum Hall soliton (QHS) from the view of M-theory on $\mathbb{S}^{1}$. Then, we show how the D0 dissolution in D2-brane is realized in M-theory language and derive the p-brane constraint eqs used to define appropriately QHS. Finally, we build an algebraic geometry realization of the QHS in type IIA superstring and show how to get its type IIB dual. Others aspects are also discussed. Keywords: Branes Physics, Algebraic Geometry, Homology of Curves in Del Pezzo surfaces, Quantum Hall Solitons.
description: 19 pages, 12 figures
Distributional chaotic generalized shifts
Creators: name: Ahmadabadi, Zahra Nili
name: Shirazi, Fatemah Ayatollah Zadeh
Publisher: name: arXiv
Year: 2017
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 54H20

description: Suppose $X$ is a finite discrete space with at least two elements, $Γ$ is a nonempty countable set, and consider self--map $φ:Γ\toΓ$. We prove that the generalized shift $σ_φ:X^Γ\to X^Γ$ with $σ_φ((x_α)_{α\inΓ})=(x_{φ(α)})_{α\inΓ}$ (for $(x_α)_{α\inΓ}\in X^Γ$) is:
 $\bullet$ distributional chaotic (uniform, type 1, type 2) if and only if $φ:Γ\toΓ$ has at least a non-quasi-periodic point,
 $\bullet$ dense distributional chaotic if and only if $φ:Γ\toΓ$ does not have any periodic point,
 $\bullet$ transitive distributional chaotic if and only if $φ:Γ\toΓ$ is one--to--one without any periodic point.
 We complete the text by counterexamples.
description: 13 pages
Two Sources of Bias in Estimating the Peak of the Laffer Curve
Creators: name: Usher, Dan
name: Usher, Dan
Publisher: name: Unknown
Year: 2013
Subjects: subject: Financial Economics
subject: Duty to Vote
subject: Tax Evasion
subject: Labour-leisure Choice

description: Important as it is for public policy, there is still no consensus about the size of the revenue-maximizing tax rate at the top of the Laffer curve. The purpose of this essay is not to supply a correct rate, but to identify difficulties in doing so. 1) Estimates of the revenue-maximizing tax rate are distorted by the discrepancy between the “elasticity of taxable income” at observed tax rates and as it would become at the revenue-maximizing tax rate, a discrepancy illustrated with reference to tax evasion as the source of the contraction in the tax base in response to increases in the tax rate. 2) When the response of tax revenue to tax rate is through the supply of labour, the Laffer curve may not be humped at all because the supply of labour may expand, rather than contract, in respond to an increase in the tax rate, causing tax revenue to rise more than proportionally to the tax rate all the way up to 100%.
A comparative study of post-secondary Equine Studies programs in the United States with that of the Deutsche Reitschule in Germany
Creators: name: Morris, Marsha Carol
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3903
subject: Education systems
classificationCode: 3904
subject: Specialist studies in education

description: This study compared and contrasted twenty-two post-secondary Equine Studies programs leading to a baccalaureate degree in the United States, as listed in the 1995 College Board Index of Majors and Graduate Degrees, with the prototypal equine program of the Deutsche Reitschule in Germany, in terms of five programmatic components, and offered inferences to account for found differences between both programs. The American schools considered represent a comprehensive grouping of four-year institutions. The Deutsche Reitschule [National Riding School] was utilized as the prototype program because of its established reputation developed over centuries in preparing instructors and standardized foundations in the equestrian arts. The five programmatic components used as comparative criteria were: (1) Curriculum, (2) Faculty, (3) Student, (4) Academic Resources and (5) Special Resources. Data used to address three research questions were obtained from institutional catalogs and a questionnaire with the cultural and societal norms as they relate to the equestrian arts in both countries. A recommendation is for administered to the director of each Equine Studies program in March, 1995. Data were then examined from an analytical perspective to identify similarities and differences among American schools, and between those institutions considered in aggregate, and the Deutsche Reitschule. It was found that Equine Studies programs in the American schools aimed the educative process toward both career- (work place) and knowledge- (preparation for personal and civic life) oriented ends, but differed widely on the importance of each, as well as, on the distribution of coursework required for a degree among major, minor, general education and elective areas. No program required more than minimal field experience. Conversely, the German program aimed solely toward preparation for a narrow field of work, with coursework only in the major (equine) area. It emphasized extensive field experience. Programs in America tend to draw female students and female faculty, whereas, the reverse was found at the Deutsche Reitschule. It was concluded that these differences are consistent with the cultural and societal norms as they relate to the equestrian arts in both countries. A recommendation is for student exchange in equine studies to be established between American institutions and the Deutsche Reitschule.
A precision measurement of the spin structure function g(2)(p)
Creators: name: Benmouna, Nawal
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 51
subject: Physical sciences
subject: FOS: Physical sciences
classificationCode: 5106
subject: Nuclear and plasma physics
classificationCode: 5107
subject: Particle and high energy physics

description: The spin structure function g2(x, Q2) and the virtual photon asymmetry A 2(x, Q2) were measured for the proton using deep inelastic scattering. The experiment was conducted at the Stanford Linear Accelerator Center (SLAC), where longitudinally polarized electrons at 29.1 and 32.3 GeV were scattered from a transversely polarized NH 3 target. Large data sets were accumulated using three independent spectrometers covering a kinematic range 0.02 ≤ x ≤ 0.8 and 1 ≤ Q2 ≤ 20 (GeV/c)2. This new data is the first data precise enough to distinguish between current models for the proton. The structure function gp2 was found to be reasonably consistent with the twist-2 Wandzura-Wilczek calculation. The Q2 dependence of g2 approximately follows the Q 2 dependence of gWW2 , although the data are not precise enough to rule out no Q2 dependence. The absolute value for Ap2 was found to be significant smaller than the Soffer limit over the measured range. The virtual photon asymmetry A2 was also found to be inconsistent with zero over much of the measured range.
L’eruzione del buco nero che copre 16 lune piene
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2021

Grazie al Murchison Widefield Array, gli astronomi sono riusciti a ottenere un’immagine di Centaurus A senza precedenti. Vista dalla Terra, l'emissione della radiogalassia si estende per otto gradi nel cielo, la lunghezza di 16 lune piene affiancate. Le nuove osservazioni evidenziano un vasto deflusso bipolare con velocità di 1100 chilometri al secondo e di massa pari a 2.9 masse solari all’anno. Tra gli autori anche Massimo Gaspari dell’Inaf
Levitazione ionica per esplorare i mondi senz’aria
Creators: Gloria Nobile
Publisher: name: Media Inaf
Year: 2021

Un team di ingegneri aerospaziali del Massachussets Institute of Technology sta mettendo a punto un nuovo concept per un rover sospeso – un “hover” – che levita sfruttando la carica naturale di corpi celesti senza atmosfera, come la Luna e gli asteroidi. Il modello matematico proposto è stato verificato in laboratorio e ha confermato che l’utilizzo di propulsori ionici miniaturizzati può consentire la levitazione elettrostatica perfino su asteroidi grandi come Psyche
On a class between Devaney chaotic and Li-Yorke chaotic generalized shift dynamical systems
Creators: name: Shirazi, Fatemah Ayatollah Zadeh
name: Ebrahimifar, Fatemeh
name: Jooyan, Maryam Hagh
name: Hosseini, Arezoo
Publisher: name: arXiv
Year: 2017
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37B99

description: In the following text, for finite discrete $X$ with at least two elements, nonempty countable $Γ$, and $φ:Γ\toΓ$ we prove the generalized shift dynamical system $(X^Γ,σ_φ)$ is densely chaotic if and only if $φ:Γ\toΓ$ does not have any (quasi-)periodic point. Hence the class of all densely chaotic generalized shifts on $X^Γ$ is intermediate between the class of all Devaney chaotic generalized shifts on $X^Γ$ and the class of all Li-Yorke chaotic generalized shifts on $X^Γ$. In addition, these inclusions are proper for infinite countable $Γ$.
 Moreover we prove $(X^Γ,σ_φ)$ is Li-Yorke sensitive (resp. sensitive, strongly sensitive, asymptotic sensitive, syndetically sensitive, cofinitely sensitive, multi-sensitive, ergodically sensitive, spatiotemporally chaotic, Li-Yorke chaotic) if and only if $φ:Γ\toΓ$ has at least one non-quasi-periodic point.
description: 14 pages - regarding some errors/mistakes please don't use previous versions
Ecco Leonard, la cometa di Natale, vista da Metis
Creators: Redazione Media Inaf
Publisher: name: Media Inaf
Year: 2021

Nella notte tra il 15 e il 16 dicembre il coronografo Metis a bordo della sonda Solar Orbiter ha fotografato la cometa Leonard, soprannominata la “cometa di Natale”. Sebbene Metis sia stato progettato per lo studio della corona solare, di tanto in tanto ha occasione di osservare anche le comete che attraversano il suo campo di vista
Imaging the coherent propagation of collective modes in the excitonic insulator candidate Ta$_2$NiSe$_5$ at room temperature
Creators: name: Bretscher, Hope M.
name: Andrich, Paolo
name: Murakami, Yuta
name: Golež, Denis
name: Remez, Benjamin
name: Telang, Prachi
name: Singh, Anupam
name: Harnagea, Luminita
name: Cooper, Nigel R.
name: Millis, Andrew J.
name: Werner, Philipp
name: Sood, A. K.
name: Rao, Akshay
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Excitonic insulators host a condensate of electron-hole pairs at equilibrium, giving rise to collective many-body effects. Although several materials have emerged as excitonic insulator candidates, evidence of long-range coherence is lacking and the origin of the ordered phase in these systems remains controversial. Here, using ultrafast pump-probe microscopy, we investigate the possible excitonic insulator Ta$_2$NiSe$_5$. Below 328 K, we observe the anomalous micrometer-scale propagation of coherent modes at velocities of the order of $\sim10^5$ m/s, which we attribute to the hybridization between phonon modes and the phase mode of the condensate. We develop a theoretical framework to support this explanation and propose that electronic interactions provide a significant contribution to the ordered phase in Ta$_2$NiSe$_5$. These results allow us to understand how the condensate's collective modes transport energy and interact with other degrees of freedom. Our study provides a unique paradigm for the investigation and manipulation of these properties in strongly correlated materials.
Information Sharing and Incentives in Organizations
Creators: name: De Bettignies, Jean-Etienne
name: Zabojnik, Jan
name: De Bettignies, Jean-Etienne
name: Zabojnik, Jan
Publisher: name: Unknown
Year: 2013
Subjects: subject: Financial Economics
subject: Information non-disclosure
subject: expert evaluation
subject: agency costs
subject: authority

description: We examine optimal information flows between a manager and a worker who is in charge of evaluating a parameter of interest, e.g. the value of a project. The manager may possesses information about the parameter, and, if informed, may divulge her in- formation to the worker. We show that information sharing may weaken the worker's incentives and that, consequently, the manager may find it optimal to conceal her in- formation from the worker. Moreover, the manager faces a time-inconsistency problem, which leads her to conceal her information more often than she would if she could commit to an information sharing policy. We build on these results to address issues related to authority in organizations.
Awareness of Unawareness: A Theory of Decision Making in the Face of Ignorance
Creators: name: Karni, Edi
name: VierÃÿ, Marie-Louise
name: Karni, Edi
name: VierÃÿ, Marie-Louise
Publisher: name: Unknown
Year: 2014
Subjects: subject: Financial Economics
subject: Awareness
subject: unawareness
subject: ignorance
subject: reverse Bayesianism
subject: utility of undescribable consequences

description: In the wake of growing awareness, decision makers anticipate that they might acquire knowledge that, in their current state of ignorance, is unimaginable. Supposedly, this anticipation manifests itself in the decision makers' choice behavior. In this paper we model the anticipation of growing awareness, lay choice-based axiomatic foundations to a subjective expected utility representation of beliefs about the likelihood of discovering unknown consequences, and assign utility to consequences that are not only unimaginable but may also be nonexistent. In so doing, we maintain the avor of reverse Bayesianism of Karni and Viero
Indicator sequences and indicator topologies of Fort transformation groups
Creators: name: Shirazi, Fatemah Ayatollah Zadeh
name: Ebrahimifar, Fatemeh
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Topology (math.GN)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 54H20

description: In the following text we prove that there exists a Fort transformation group with indicator sequence $(p_0,\ldots,p_n)$ if and only if $0=p_0\leq p_1\leq\cdots\leq p_n=1$, moreover we characterize all possible indicator topological spaces of Fort transformation groups.The text will study indicator sequences and indicator topologies of Fort transformation semigroups too.
description: 8 pages
A precision measurement of the spin structure function g(2)(p)
Creators: name: Benmouna, Nawal
Publisher: name: American University
Year: 2023

description: The spin structure function g2(x, Q2) and the virtual photon asymmetry A 2(x, Q2) were measured for the proton using deep inelastic scattering. The experiment was conducted at the Stanford Linear Accelerator Center (SLAC), where longitudinally polarized electrons at 29.1 and 32.3 GeV were scattered from a transversely polarized NH 3 target. Large data sets were accumulated using three independent spectrometers covering a kinematic range 0.02 ≤ x ≤ 0.8 and 1 ≤ Q2 ≤ 20 (GeV/c)2. This new data is the first data precise enough to distinguish between current models for the proton. The structure function gp2 was found to be reasonably consistent with the twist-2 Wandzura-Wilczek calculation. The Q2 dependence of g2 approximately follows the Q 2 dependence of gWW2 , although the data are not precise enough to rule out no Q2 dependence. The absolute value for Ap2 was found to be significant smaller than the Soffer limit over the measured range. The virtual photon asymmetry A2 was also found to be inconsistent with zero over much of the measured range.
Advocacy non-governmental organizations and sustainable human development in post-war Lebanon
Creators: name: Debbas, Rose Hanna
Publisher: name: American University
Year: 2023

description: The primary purpose of this research is to explore the role of advocacy Non-Governmental Organizations (NGOs) in post-war Lebanon. Specifically, it focuses on the contributions of advocacy NGOs to the process of sustainable human development. Sustainable human development is defined in this research as development that provides for economic growth and equitable distribution of the benefits of growth; a democratic political system that respects human rights, freedom, gender equity and the rights of other marginalized segments of the population; a functioning healthy civil society; and finally, a sustainable environment. This research shows that the contributions of advocacy NGOs in Lebanon continue to be marginal and limited, due to internal organizational challenges, namely, lack of funds, lack of commitment and lack of professional human resources. A patriarchal culture and a sectarian political system and culture were shown as basic challenges to their work and contributions. Regional politics and interference were shown to be equally important negatively contributing factors. This research also demonstrates that advocacy NGOs in Lebanon are contributing mainly to the democratization process of the political system. Furthermore, this research shows that the role and dynamics of advocacy NGOs in developing countries differ significantly from those in developed countries, which makes it imperative for advocacy NGOs in Lebanon to redefine their advocacy role or expand it.
Possible heights of graph transformation groups
Creators: name: Shirazi, Fatemah Ayatollah Zadeh
name: Hosseini, Arezoo
name: Ahmadabadi, Zahra Nili
Publisher: name: arXiv
Year: 2017
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 54H20

description: In the following text we prove that for all finite $p\geq0$ there exists a topological graph $X$ such that $\{p,p+1,p+2,\ldots\}\cup\{+\infty\}$ is the collection of all possible heights for transformation groups with phase space $X$. Moreover for all topological graph $X$ with $p$ as height of transformation group $(Homeo(X),X)$, $\{p,p+1,p+2,\ldots\}\cup\{+\infty\}$ again is the collection of all possible heights for transformation groups with phase space $X$.
description: 9 pages
title: Molecular mechanisms of immune deficiency in adenosine deaminase (ADA)-deficient SCID patients: implications for stem cell gene therapy
Creators: name: Cassani, Barbara
Publisher: name: The Open University
Year: 2007

description: Mutations in the Adenosine Deaminase (ADA) gene are responsible for a form of Severe Combined Immunodeficiency (SCID), explained by the lymphotoxic accumulation of ADA substrates, adenosine and 2’-deoxy-adenosine. Haematopoietic stem cells (HSCs)-based gene therapy (GT) has been shown to correct both the immune and metabolic defect of ADA-SCID children, thus providing a unique model to investigate the molecular mechanisms linking the altered purine metabolism to T cell dysfunction. We found that severely compromised effector functions in ADA-deficient T cells associate with an intrinsically reduced ERK1/2 signaling, a defective activation of CREB and possibly to an altered nuclear recruitment of NF-kB, as predicted by the decreased phosphorylation of IkBα. Conversely, in T-cell lines generated from patients after GT, the biochemical events following TCR-triggering occur properly, leading to restored effector functions. Remarkably, in ADA-deficient but not in gene-corrected T cells, exposure to 2’-deoxy-adenosine induces a strong inhibition of T cell activation. This effect is consistent with an aberrant A2A receptor-mediated signaling and PKA hyperactivation. To assess the long-term safety of GT, retroviral integration sites (RIS) were cloned and analyzed from transduced bone marrow-derived CD34+ cells before transplantation and from their multilineage progeny in five patients. RIS occur preferentially around transcription start sites and in gene-dense regions, favoring genes transcriptionally active in CD34+ cells at the time of transduction as well as genes expressed in T cells. However, preliminary quantitative transcript analysis, at clonal cell level, showed no significant alteration in expression of genes correlated with the nearby vector integration, in agreement with the normal gene expression profile and functional behavior of T cell population. Altogether, these results contribute to extend the present knowledge on the pathogenesis of ADA-SCID and demonstrate the efficacy and safety of HSC gene therapy as a treatment for this disease.
Quando una magnetar trema
Creators: Marco Malaspina
Publisher: name: Media Inaf
Year: 2021

Registrate per la prima volta in dettaglio le fasi iniziali di una potente scossa avvenuta su una magnetar. Il segnale è arrivato dalla galassia Ngc 253, a oltre 10 milioni di anni luce da noi, ed è stato così intenso che solo lo strumento Asim, a bordo della Stazione spaziale, è riuscito ad acquisirlo senza rimanerne accecato. Fra gli autori dello studio, pubblicato ieri su Nature, c’è anche l’italiano Martino Marisaldi, associato Inaf, oggi all’università di Bergen, in Norvegia
Model-based ROC (mROC) curve: examining the effect of case-mix and model calibration on the ROC plot
Creators: name: Sadatsafavi, Mohsen
name: Saha-Chaudhuri, Paramita
name: Petkau, John
Publisher: name: arXiv
Year: 2020
Subjects: subject: Methodology (stat.ME)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: The performance of risk prediction models is often characterized in terms of discrimination and calibration. The Receiver Operating Characteristic (ROC) curve is widely used for evaluating model discrimination. When evaluating the performance of a risk prediction model in a new sample, the shape of the ROC curve is affected by both case-mix and the postulated model. Further, compared to discrimination, evaluating calibration has not received the same level of attention. Commonly used methods for model calibration involve subjective specification of smoothing or grouping. Leveraging the familiar ROC framework, we introduce the model-based ROC (mROC) curve to assess the calibration of a pre-specified model in a new sample. mROC curve is the ROC curve that should be observed if a pre-specified model is calibrated in the sample. We show the empirical ROC and mROC curves for a sample converge asymptotically if the model is calibrated in that sample. As a consequence, the mROC curve can be used to assess visually the effect of case-mix and model mis-calibration. Further, we propose a novel statistical test for calibration that does not require any smoothing or grouping. Simulations support the adequacy of the test. A case study puts these developments in a practical context. We conclude that mROC can easily be constructed and used to evaluate the effect of case-mix and model calibration on the ROC plot, thus adding to the utility of ROC curve analysis in the evaluation of risk prediction models. R code for the proposed methodology is provided (https://github.com/msadatsafavi/mROC/).
description: 44 pages, 1 table, 5 figures, 6 appendices