cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Proximity effect of vanadium on spin-density-wave magnetism in Cr films
Creators: name: Kravtsov, E.
name: Brucas, R.
name: Hjorvarsson, B.
name: Hoser, A.
name: Nefedov, A.
name: Radu, F.
name: Remhof, A.
name: Wilkins, S.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The spin-density wave (SDW) state in thin chromium films is well known to be strongly affected by proximity effects from neighboring layers. To date the main attention has been given to effects arising from exchange interactions at interfaces. In the present work we report on combined neutron and synchrotron scattering studies of proximity effects in Cr/V films where the boundary condition is due to the hybridization of Cr with paramagnetic V at the interface. We find that the V/Cr interface has a strong and long-range effect on the polarization, period, and the Néel temperature of the SDW in rather thick Cr films. This unusually strong effect is unexpected and not predicted by theory.
description: 7 figures
"The play's the thing": The effect of performance-based teaching methodology on student attitudes toward Shakespeare study
Creators: name: O'Brien, Margaret Hoffman
Publisher: name: American University
Year: 2023

description: Though Shakespeare is the dominant author in the American secondary school curriculum, there is no empirical evidence suggesting practical methodologies successful in the teaching of Shakespeare. This study examined the effect of speaking and enacting the text as a successful methodology. Its purpose was to determine whether learning about plays through performance-based methodology influences secondary school students' attitudes positively and significantly, as compared to students who learn Shakespeare through traditional, nonactive classroom methods. Subjects were selected in a two-step process. Fifteen secondary school teachers who did not use dramatic activity but rather traditional nonactive methods in their teaching of Shakespeare were identified by means of a Teacher Screening Questionnaire. Each of these teachers involved one class in the study; these students comprised the control group. Fifteen teachers experienced in the teaching of Shakespeare through performance-based methodology were identified through the Folger Shakespeare Library. These teachers also selected one class for participation in the study; these students made up the experimental group. Six elements of student attitude were identified: overall positive/negative response, sense of mastery, sense of accomplishment, understanding and accessibility of Shakespeare's language, sense of enjoyment, and feelings about future study of Shakespeare. Attitude was measured by a corresponding six-item survey instrument administered before and after the period of Shakespeare study. All subjects completed the pretest. Control group students were taught Shakespeare in the traditional manner while experimental group students received the treatment, a sequence of ten performance-based lessons. Two weeks after completing their Shakespeare study, all subjects completed the post-test. Students who learn Shakespeare by means of active, performance-based methodology have a more positive attitude toward Shakespeare study than do students who learn through traditional methodology. Affected most powerfully and most positively were students' attitudes concerning their own ability to understand Shakespeare's language and to master Shakespeare as a school subject, and their belief that the study of Shakespeare can be enjoyable. This study supports change from traditional nonactive classroom strategies to active, performance-based methodologies in the teaching of Shakespeare and other literature.
Horseradish peroxidase oxidation of 2,3-diaminopyridine and related compounds
Creators: name: Swartz, Laura A.
Publisher: name: American University
Year: 2023

description: The substrate 2,3 diaminopyridine and several structurally similar compounds were oxidized enzymatically and chemically. The resulting products were analyzed. The enzymatic oxidation was conducted using horseradish peroxidase as the enzyme and hydrogen peroxide was used as the co-oxidizing agent. The chemical oxidation was conducted using ferric chloride as the oxidizing agent. The ultraviolet and fluorescent characteristics of the starting materials and products were different. Because the starting material is non-fluorescent and the products are fluorescent, the materials are good substrates for the ELISA assay. The oxidations of o-phenylenediamine, 4-methoxy-o-phenylendiamine, 2,3-diaminotoluene, 3,4-diaminotoluene, and 2,3-diaminopyridine were studied. The enzymatic and chemical oxidations of 4-methoxy-o-phenylenediamine produced 8-methoxy-o-phenylenediamine as the major product. This was confirmed by mass spectra, nuclear magnetic resonance spectra, infrared, and ultraviolet spectra comparisons. The enzymatic oxidation of 2,3-diaminotoluene produced either 2,3-diamino-1,8-dimethylphenazine, or 2,3-diamino-1,5-dimethylphenazine, or a mixture of both compounds. In addition, the enzymatic oxidation of 3,4-diaminotoluene produced a product larger than the phenazine product predicted. The enzymatic oxidation of 2,3-diaminopyridine produced a mixture of compounds. The reaction is pH dependent. As the pH and reaction time are altered different compounds are formed. The majority are large, conjugated molecules of varying sizes. The mass spectrum data suggests that azo compounds are also formed. UV studies were conducted to determine the effect of time, pH, substrate concentration, enzyme concentration, and hydrogen peroxide concentration on the reaction. The compound 5-aminoindazole was also studied by UV to determine the absorbance of product over time. The investigation of the substrates and subsequent oxidation products of the reactions studied in the research project has led to a better understanding of their chemical properties. The new fluorescent products that were found may be useful in enzyme immunosorbant assays.
Horseradish peroxidase oxidation of 2,3-diaminopyridine and related compounds
Creators: name: Swartz, Laura A.
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 34
subject: Chemical sciences
subject: FOS: Chemical sciences
classificationCode: 3405
subject: Organic chemistry

description: The substrate 2,3 diaminopyridine and several structurally similar compounds were oxidized enzymatically and chemically. The resulting products were analyzed. The enzymatic oxidation was conducted using horseradish peroxidase as the enzyme and hydrogen peroxide was used as the co-oxidizing agent. The chemical oxidation was conducted using ferric chloride as the oxidizing agent. The ultraviolet and fluorescent characteristics of the starting materials and products were different. Because the starting material is non-fluorescent and the products are fluorescent, the materials are good substrates for the ELISA assay. The oxidations of o-phenylenediamine, 4-methoxy-o-phenylendiamine, 2,3-diaminotoluene, 3,4-diaminotoluene, and 2,3-diaminopyridine were studied. The enzymatic and chemical oxidations of 4-methoxy-o-phenylenediamine produced 8-methoxy-o-phenylenediamine as the major product. This was confirmed by mass spectra, nuclear magnetic resonance spectra, infrared, and ultraviolet spectra comparisons. The enzymatic oxidation of 2,3-diaminotoluene produced either 2,3-diamino-1,8-dimethylphenazine, or 2,3-diamino-1,5-dimethylphenazine, or a mixture of both compounds. In addition, the enzymatic oxidation of 3,4-diaminotoluene produced a product larger than the phenazine product predicted. The enzymatic oxidation of 2,3-diaminopyridine produced a mixture of compounds. The reaction is pH dependent. As the pH and reaction time are altered different compounds are formed. The majority are large, conjugated molecules of varying sizes. The mass spectrum data suggests that azo compounds are also formed. UV studies were conducted to determine the effect of time, pH, substrate concentration, enzyme concentration, and hydrogen peroxide concentration on the reaction. The compound 5-aminoindazole was also studied by UV to determine the absorbance of product over time. The investigation of the substrates and subsequent oxidation products of the reactions studied in the research project has led to a better understanding of their chemical properties. The new fluorescent products that were found may be useful in enzyme immunosorbant assays.
title: Dissecting the molecular mechanisms regulating proliferation, antigen responsiveness, and differentiation of CD4⁺ T lymphocytes : a central role for the mammalian target of Rapamycin (mTor)
Creators: name: Colombetti, Sara
Publisher: name: The Open University
Year: 2004

description: The intracellular events that regulate lymphocyte proliferation upon antigen encounter and the ability of the cells to respond to subsequent stimulation and to differentiate into effector cells remain largely to be understood. Several studies have linked T cell proliferation with the maintenance of antigen responsiveness and with the ability of the cells to differentiate and to acquire proper effector functions. The aim of my Ph.D. research project was to investigate the role of the TCR, CD28, and IL-2 generated intracellular events dictating CD4+ T lymphocyte proliferation and differentiation. In a model of CD3-induced clonal anergy, we have shown that antigen responsiveness was uniquely regulated by an IL-2/IL-2R-induced signalling event, which was delivered independently of IL-2-driven cell proliferation, and which was Rapamycin-sensitive. This indicates that proliferation and antigen responsiveness are independently regulated and that the latter specifically requires intact signalling through mTor, the mammalian target of Rapamycin. Moreover, we have shown that proper activation of p70S6k, one the known target of mTor, might play a crucial role in the maintenance of T lymphocyte responsiveness. We have also investigated the role of mTor in a model of in vitro antigen driven naive T cell differentiation. In this model, blocking mTor activity by the addition of Rapamycin during T cell activation, allowed comparable T cell expansion, but completely prevented polarization of effector cells. Together our results indicate that the intracellular events that dictate T cell proliferation are distinct from the intracellular signals that modulate the functional phenotype of activated T lymphocytes and suggest that, while mTor-dependent signalling is dispensable for T cell proliferation, it is primarily involved in the acquisition of proper T cell effector functions.
Andrena (Thysandrena) candida Smith 1879
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
Animalia
Arthropoda
Insecta
Hymenoptera
Andrenidae
Andrena
Andrena candida

description: Andrena (Thysandrena) candida Smith, 1879
[Holotype: NHMUK; ♀ Vancouver’s Island, British Columbia, Canada]
LaBerge (1977) reported Andrena candida in the Coastal Sage Matorral, Succulent Coastal Matorral, and Chaparral of the CFP in Baja California. We reviewed three males and one female collected in the Succulent Coastal Matorral in Arroyo Santo Domingo in April 1963. The BBPT collected two females in Ejido A. Melendrez in April 2020 and March 2021 (1 ♀ MABC; 1 ♀ ECOAB). See fig. 21.
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 68, DOI: 10.11646/zootaxa.5522.1.1, http://zenodo.org/record/13920532
Spectral dominance of complex roots for single-delay linear equations
Creators: name: Mazanti, Guilherme
name: Boussaada, Islam
name: Niculescu, Silviu-Iulian
name: Vyhlídal, Tomáš
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optimization and Control (math.OC)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: This paper provides necessary and sufficient conditions for the existence of a pair of complex conjugate roots, each of multiplicity two, in the spectrum of a linear time-invariant single-delay equation of retarded type. This pair of roots is also shown to be always strictly dominant, determining thus the asymptotic behavior of the system. The proof of this result is based on the corresponding result for real roots of multiplicity four, continuous dependence of roots with respect to parameters, and the study of crossing imaginary roots. We also present how this design can be applied to vibration suppression and flexible mode compensation.
description: arXiv admin note: substantial text overlap with arXiv:2002.06146
Selective effects of 3-methylindole on the olfactory system: An anatomical and behavioral study
Creators: name: Setzer, Angela Kufera
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 52
subject: Psychology
subject: FOS: Psychology

description: The effect of 3-Methylindole (3-MI) on axonal transport of horseradish peroxidase (HRP) from olfactory epithelium to the olfactory bulb and on odor detection was examined. In Experiment I, rats given 0, 150, 350, or 400 mg/kg of 3-MI were sacrificed 7, 12, 22, or 92 days later, and their olfactory bulbs were examined. 3-MI had selective effects on axonal transport that were both dose- and time-dependent. At the largest dose and shortest survival time, only a few bulbar glomeruli, generally in the mid lateral and ventromedial sectors of the bulb, had reaction product. For each dose there was a clear pattern of recovery in axonal transport as a function of time. The most severe deficits in axonal transport at lower doses and or longer survival times were in the dorsal and dorsomedial sectors of the bulb. In Experiment II, four trained rats treated with 400 mg/kg dose initially performed at chance but were able to relearn a simple odor detection task (0.15% isoamyl acetate vs. air). Controls and 3-MI treated rats trained on a visual task, however, had no deficits in retention. Experimental animals had, on average, less than 6% of glomeruli with detectable levels of reaction product. In Experiment III, three experimental animals tested on different concentrations of each of 4 different odors performed more poorly than controls but each was able to detect one or more concentrations of each odor and there was no evidence for a specific anosmia. These rats had very light to dense axonal transport to approximately 12% of their olfactoly bulb glomeruli. Further, bulbar regions identified with 2-DG in prior studies with these odors had little or no transport. Four other animals which had axonal transport in approximately 6% of their olfactory bulb glomeruli performed at chance on each of these odor detection tasks. These results demonstrate that 3-MI has a highly selective effect on connections of the bulb with receptor neurons and that rats with minimal input to restricted parts of the bulb are able to detect a variety of odors.
title: Avant-propos
title: Boaistuau auteur
titleType: Subtitle
Creators: name: Grande, Nathalie
Publisher: name: Classiques Garnier
Year: 2021
Subjects: subject: Auteur
subject: Auctorialité
subject: Compilation
subject: Création
subject: Miseria hominis
subject: Pessimisme
subject: Récit bref
subject: Traduction

description: Alors que l’histoire littéraire ne conserve le souvenir de Boaistuau qu’à titre de minor, traducteur et compilateur, les articles qui composent cet ouvrage le font enfin apparaître comme un auteur au sens plein du terme, un créateur de formes qui n’a cessé de renouveler son inspiration au fil de ses œuvres. Son pessimisme ontologique l’amène à une conscience politique aiguë, où il puise l’inspiration tragique qui l’amène à séduire un large public.
Revisiting the Globular Cluster System of the Merger Remnant Elliptical NGC 3610
Creators: name: Strader, Jay
name: Brodie, Jean P.
name: Forbes, Duncan A.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have obtained Keck spectra of six candidate globular clusters (GCs) in the dynamically young elliptical galaxy NGC 3610, supplementing our previous Keck spectra of eight confirmed GCs (Strader et al. 2003). Five of our new candidates are confirmed to be GCs. Of the thirteen GCs, eleven are located within the K band effective radius of 7 kpc. Two of these thirteen clusters are found to be young (~ 2 Gyr) and very metal-rich ([Z/H] ~ +0.5), three are old and metal-poor, and the remaining eight clusters are old and metal-rich. The ages of the young clusters are consistent with a recent spectroscopic age estimate of 1.6+/-0.5 Gyr for the galaxy itself (Denicolo et al. 2003) and suggest that these clusters formed in the disk-disk merger which likely created NGC 3610. Intriguingly, both young GCs have [alpha/Fe] ~ +0.3, while the majority of the old clusters are not alpha-enhanced, in contrast to Galactic and M31 GCs, and contrary to predictions of nucleosynthetic calculations. The two old subpopulations of GCs can be attributed to the merger progenitors. The relative numbers of old and new metal-rich GCs are poorly constrained because of the expected differences in radial distributions of the two subpopulations. However, based on our spectroscopic results and a comparison of the Hubble Space Telescope color magnitude diagram (Whitmore et al. 2002) with stellar population models, we argue that more than half of the metal-rich GCs are likely to be old.
description: 21 pages, 6 figures, accepted for Jan 2004 AJ
Selective effects of 3-methylindole on the olfactory system: An anatomical and behavioral study
Creators: name: Setzer, Angela Kufera
Publisher: name: American University
Year: 2023

description: The effect of 3-Methylindole (3-MI) on axonal transport of horseradish peroxidase (HRP) from olfactory epithelium to the olfactory bulb and on odor detection was examined. In Experiment I, rats given 0, 150, 350, or 400 mg/kg of 3-MI were sacrificed 7, 12, 22, or 92 days later, and their olfactory bulbs were examined. 3-MI had selective effects on axonal transport that were both dose- and time-dependent. At the largest dose and shortest survival time, only a few bulbar glomeruli, generally in the mid lateral and ventromedial sectors of the bulb, had reaction product. For each dose there was a clear pattern of recovery in axonal transport as a function of time. The most severe deficits in axonal transport at lower doses and or longer survival times were in the dorsal and dorsomedial sectors of the bulb. In Experiment II, four trained rats treated with 400 mg/kg dose initially performed at chance but were able to relearn a simple odor detection task (0.15% isoamyl acetate vs. air). Controls and 3-MI treated rats trained on a visual task, however, had no deficits in retention. Experimental animals had, on average, less than 6% of glomeruli with detectable levels of reaction product. In Experiment III, three experimental animals tested on different concentrations of each of 4 different odors performed more poorly than controls but each was able to detect one or more concentrations of each odor and there was no evidence for a specific anosmia. These rats had very light to dense axonal transport to approximately 12% of their olfactoly bulb glomeruli. Further, bulbar regions identified with 2-DG in prior studies with these odors had little or no transport. Four other animals which had axonal transport in approximately 6% of their olfactory bulb glomeruli performed at chance on each of these odor detection tasks. These results demonstrate that 3-MI has a highly selective effect on connections of the bulb with receptor neurons and that rats with minimal input to restricted parts of the bulb are able to detect a variety of odors.
Effective String Picture for Confining Gauge Theories at Finite Temperature
Creators: name: Caselle, Michele
name: Hasenbusch, Martin
name: Panero, Marco
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study the ``effective string picture'' of confinement, deriving theoretical predictions for the interquark potential at finite temperature. At low temperatures, the leading string correction to the linear confining potential between a heavy quark-antiquark pair is the "Lüscher term''. Assuming a Nambu-Goto effective string action, subleading contributions can be worked out in an analytical way. We also discuss the contribution given by a possible ``boundary term'' in the effective action, and compare these predictions with high precision results from simulations of lattice Z(2) gauge theory in three dimensions, obtained with an algorithm that exploits the duality of the Z(2) gauge model with the Ising spin model.
description: Talk given at ``Confinement 2003'', RIKEN, Wako, Japan, July 21-24, 2003; 5 pages, 2 figures, uses ws-procs9x6.cls
Topologizable and power bounded weighted composition operators on spaces of distributions
Creators: name: Kalmes, Thomas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47B33 (Primary) 47C05, 47F05 (Secondary)

description: We study topologizability and power boundedness of weigh\-ted composition operators on (certain subspaces of) $\mathscr{D}'(X)$ for an open subset $X$ of $\mathbb{R}^d$. For the former property we derive a characterization in terms of the symbol and the weight of the weighted composition operator, while for the latter property necessary and sufficient conditions on the weight and the symbol are presented. Moreover, for an unweighted composition operator a characterization of power boundedness in terms of the symbol is derived for the special case of a bijective symbol.
description: v2: accepted manuscript; accepted for publication in Annales Polonici Mathematici; 13 pages
A comparison of residential and non-residential educational background effects on selected developmental dimensions of deaf university freshmen
Creators: name: Weiner, Stephen Francis
Publisher: name: American University
Year: 2023

description: This study compared a sample of deaf college freshmen from residential secondary schools for the deaf with a sample of deaf college freshmen from non-residential secondary schools along three developmental dimensions, namely Establishing and Clarifying Purpose (PUR), Developing Mature Interpersonal Relationships (MIR), and Academic Autonomy (AA), as assessed by Winston and Miller's (1987) Student Developmental Task and Lifestyle Inventory (SDTLI). Residential schools are those exclusively for deaf students. They usually have deaf teachers and administrators. Non-residential schools integrate hearing and deaf students. They are less likely to have deaf teachers and administrators. The subjects were 113 full-time freshmen students between 18 and 24 years of age, all of whom lived in residence halls at Gallaudet University. None of the students had matriculated at any other college prior to entering Gallaudet University. They were grouped into two samples based on their high school background. Fifty-eight subjects graduated from residential secondary schools for the deaf and 55 subjects graduated from non-residential secondary schools. Demographic data showed a uniform distribution of characteristics for both groups. Three hypotheses were developed, one for each developmental dimension of the SDTLI. It was hypothesized that students from a non-residential school would score significantly higher on the PUR dimension than students from a residential secondary school. It was also hypothesized that students from residential secondary school for the deaf would score significantly higher on each the MIR and AA dimensions than students from non-residential secondary school. The t-test statistic was used in hypothesis testing. Significance was set at p $\leq$.05. No significant differences were found and all of three hypotheses were rejected. In general, the study concluded that type of secondary school background of study subjects is not an important influence in terms of three dimensions of development (PUR, MIR, and AA as measured through the SDTLI). The findings were interpreted for their meaning to Gallaudet University officials in terms of enhancing their understanding of deaf college freshmen attending Gallaudet University.
Water currents in New Mexico: A global reach
Creators: name: Ward, Frank A.
name: Hurd, Brian H.
name: Sayles, Sarah
name: Ward, Frank A.
name: Hurd, Brian H.
name: Sayles, Sarah
Publisher: name: Unknown
Year: 2018
Subjects: Agricultural and Food Policy
Environmental Economics and Policy

description: This article describes a series of water issues and policy choices for adapting to climate-stressed river and stream systems. It addresses issues that are important both in New Mexico and internationally for which economic analysis can inform and guide ongoing policy debates. Economic analysis is needed both in New Mexico and overseas to guide plans for efficient, equitable, and sustainable water use and for reducing costs of adapting to climate-stressed river and aquifer systems. Special attention is given to three current water issues in New Mexico: climate-stress adaptation through water trading and banking, adaptation through transboundary aquifer sharing, and adaptation through headwater flow capture. All three of these measures face design and implementation challenges both in New Mexico and internationally for adapting to growing evidence of climate-stressed river systems.
Andrena (Thysandrena) declinis LaBerge 1977
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
Animalia
Arthropoda
Insecta
Hymenoptera
Andrenidae
Andrena
Andrena declinis

description: Andrena (Thysandrena) declinis LaBerge, 1977
[Holotype: CASC; ♀ Coyote Creek (7.24 km N. of Borrego Springs), San Diego Co., California, US; March 17, 1960]
Andrena declinis occurs in the southwestern USA, and BC, Mexico. We examined one female collected in the Central Desert in May 1975 (LACM). Within the scope of this project, the BBPT collected three specimens in March of 2021 in the Succulent Coastal Matorral and Central Desert (MABC). See fig. 21.
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 68, DOI: 10.11646/zootaxa.5522.1.1, http://zenodo.org/record/13920532
The growth of supermassive black holes in the centers of galaxies: absorption of stars and activity of galactic nuclei
Creators: name: Sirota, V. A.
name: Ilyin, A. S.
name: Zybin, K. P.
name: Gurevich, A. V.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The evolution of a supermassive black hole in the center of galaxy is considered. We analyze the kinetic equation describing relaxation processes associated with stellar encounters. The initial distribution function of stars is assumed to be isothermal, and it changes in accordance with consumption of stars by the black hole. We calculate the consumption rate and obtain the law of growth of supermassive black hole, i.e. the dependence of the black hole mass on time and on the velocity dispersion of stars. The obtained values of mean black hole mass and mean rate of stars consumption by a black hole are in reasonable agreement with observational data.
Deformed Harry Dym and Hunter-Zheng Equations
Creators: name: Brunelli, J. C.
name: Das, Ashok
name: Popowicz, Ziemowit
Publisher: name: arXiv
Year: 2003
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the deformed Harry Dym and Hunter-Zheng equations with two arbitrary deformation parameters. These reduce to various other known models in appropriate limits. We show that both these systems are bi-Hamiltonian with the same Hamiltonian structures. They are integrable and belong to the same hierarchy corresponding to positive and negative flows. We present the Lax pair description for both the systems and construct the conserved charges of negative order from the Lax operator. For the deformed Harry Dym equation, we construct the non-standard Lax representation for two special classes of values of the deformation parameters. In general, we argue that a non-standard description will involve a pseudo-differential operator of infinite order.
description: Latex file, 15 pages
The magnetic, electronic, and light-induced topological properties in two-dimensional hexagonal FeX2 (X = Cl, Br, I) monolayers
Creators: name: Kong, Xiangru
name: Li, Linyang
name: Liang, Liangbo
name: Peeters, Francois M.
name: Liu, Xiong-Jun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Topological materials are fertile ground for investigating topological phases of matter and topological phase transitions. In particular, the quest for novel topological phases in 2D materials is attracting fast growing attention. Here, using Floquet-Bloch theory, we propose to realize chiral topological phases in 2D hexagonal FeX2 (X=Cl, Br, I) monolayers under irradiation of circularly polarized light. Such 2D FeX2 monolayers are predicted to be dynamical stable, and exhibit both ferromagnetic and semiconducting properties. To capture the full topological physics of the magnetic semiconductor under periodic driving, we adopt ab initio Wannier-based tight-binding methods for the Floquet-Bloch bands, with the light-induced band gap closings and openings being obtained as the light field strength increases. The calculations of slab with open boundaries show the existence of chiral edge states. Interestingly, the topological transitions with branches of chiral edge states changing from zero to one and from one to two by tuning the light amplitude are obtained, showing that the topological floquet phase of high Chern number can be induced in the present Floquet-Bloch systems.
CMB imprints of non-canonical anisotropic inflation
Creators: name: Do, Tuan Q.
name: Kao, W. F.
name: Lin, Ing-Chen
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Effect of non-canonical scalar fields on the CMB imprints of the anisotropic inflation will be discussed in details in this paper. In particular, we are able to obtain the general formalism of the angular power spectra in the scalar perturbations, tensor perturbations, cross-correlations, and linear polarization in the context of the anisotropic inflation model involving non-canonical scalar fields. Furthermore, some significant numerical spectra will be plotted using the most recent data of Planck as well as the BICEP2 and Keck array. As a result, we find a very interesting point that the $TT$ spectra induced by the tensor perturbations as well as by the linear polarization will increase when the speed of sound decreases.
description: 22 pages, 7 figures, minor revision with additional discussions on some important results investigated by other people. Some relevant references are added. All results and conclusions are not changed. Accepted for publication in EPJC. Comments are welcome
Considerations regarding the operation of a rectifier with semiconductor diodes immersed in oil and having modulation possibilities
Creators: name: Forje, Alexandru
name: Pop, Mihai G.M.
name: Forje, Iulia
name: Cirstea, Tiberiu
name: Inta, Ion
name: Negrescu, Horia
name: Bednar, Horst
name: Brunno Bednar
name: Vlad, Doina
name: Morariu, Maria
name: Vlad, Mircea Florentin
Publisher: name: figshare
Year: 2020
Subjects: subject: 90699 Electrical and Electronic Engineering not elsewhere classified
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: 90602 Control Systems, Robotics and Automation
subject: 91305 Energy Generation, Conversion and Storage Engineering
subject: FOS: Mechanical engineering

description: Obiectul acestui articol este de a prezenta cfteva din problemele pe care le ridica reali­ zarea unui redresor cu diode semiconductoare, de a caror cunoastere depinde stabilirea parametrilor optimali de functionare a acestuia in diferite regimuri.In contextul trecerii la o nou calitate in intreaga activitate productiva, problema optimi­zarii functionarii instalatiilor cu pierderi de energie se pune cu tot mai mare acuitate, iar studiul de cunoastere a particularitatilor in functionare are o importanta deosebita.
A comparison of residential and non-residential educational background effects on selected developmental dimensions of deaf university freshmen
Creators: name: Weiner, Stephen Francis
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 a sample of deaf college freshmen from residential secondary schools for the deaf with a sample of deaf college freshmen from non-residential secondary schools along three developmental dimensions, namely Establishing and Clarifying Purpose (PUR), Developing Mature Interpersonal Relationships (MIR), and Academic Autonomy (AA), as assessed by Winston and Miller's (1987) Student Developmental Task and Lifestyle Inventory (SDTLI). Residential schools are those exclusively for deaf students. They usually have deaf teachers and administrators. Non-residential schools integrate hearing and deaf students. They are less likely to have deaf teachers and administrators. The subjects were 113 full-time freshmen students between 18 and 24 years of age, all of whom lived in residence halls at Gallaudet University. None of the students had matriculated at any other college prior to entering Gallaudet University. They were grouped into two samples based on their high school background. Fifty-eight subjects graduated from residential secondary schools for the deaf and 55 subjects graduated from non-residential secondary schools. Demographic data showed a uniform distribution of characteristics for both groups. Three hypotheses were developed, one for each developmental dimension of the SDTLI. It was hypothesized that students from a non-residential school would score significantly higher on the PUR dimension than students from a residential secondary school. It was also hypothesized that students from residential secondary school for the deaf would score significantly higher on each the MIR and AA dimensions than students from non-residential secondary school. The t-test statistic was used in hypothesis testing. Significance was set at p $\leq$.05. No significant differences were found and all of three hypotheses were rejected. In general, the study concluded that type of secondary school background of study subjects is not an important influence in terms of three dimensions of development (PUR, MIR, and AA as measured through the SDTLI). The findings were interpreted for their meaning to Gallaudet University officials in terms of enhancing their understanding of deaf college freshmen attending Gallaudet University.
The Texas state water plan: history and future
Creators: name: Torrell, Gregory
name: Stevens, Reid
name: Torrell, Gregory
name: Stevens, Reid
Publisher: name: Unknown
Year: 2018
Subjects: Agricultural and Food Policy
Environmental Economics and Policy

description: The severe Texas droughts of the 1950s prompted the development of a comprehensive planning framework to guide the state’s water policy and investments. The Texas State Water Plan has been regularly updated since the first plan in 1961 and has developed into a system of regional water plans that define the statewide strategies to mitigate the impact of future severe droughts. In this paper, we describe the history of the Texas State Water Plan, some of its shortcomings, and provide recommendations for its improvement. We recommend that the plan include linkages between demands and supplies, allow for flexibility in regional planning, and expand its scope to allow a more holistic approach to water management.
A general solution for the quark propagator in two-dimensional covariant gauge QCD
Creators: name: Gogohia, V.
name: Kluge, Gy.
name: de Usera, I. Vargas
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We have investigated a closed set of equations for the quark propagator, which has been obtained earlier within a new, nonperturbative approach to two-dimencional covariant gauge QCD. It is shown that this theory implies quark confinement (the quark propagator has no poles, indeed), as well as dynamical breakdown of chiral symmetry (a chiral symmetry preserving solution is forbidden). The above-mentioned set of equations can be exactly solved in the chiral limit. We develop an analytical formalism, the so-called chiral perturbation theory at the fundamental quark level, which allows one to find solution for the quark propagator in powers of the light quark masses. Each correction satisfies the differential equation, which can be formally solved. We develop also an analytical formalism which alows one to find solution for the quark propagator in the inverse powers of the heavy quark masses. IT coincides with free heavy quark propagator up to terms of order $1/m_Q^3$, where $m_Q$ is the heavy quark mass. So this solution automatically possesses the heavy quark flavor symmetry up to terms of order $1/m_Q$. At the same time, we have found a general solution for the heavy quark propagator, which by no means can be reduced to the free one.
description: 12 pages, two figures, no tables, typos are corrected
Continuities and discontinuities in the Algerian social formation
Creators: name: Zerougui, Abdelkader
Publisher: name: American University
Year: 2023

description: The Algerian social formation has experienced since independence a series of discontinuities and ruptures in its economic, political, social, linguistic and ethnic structures. My approach to this study is historical and analytical, and ascertains that these discontinuities cannot be looked at separately, but rather have to be merged for a comprehension of the events taking place in Algeria. The first chapter introduces the theoretical framework. The second chapter explores the development of the private sector and its impact on society. It is argued that the policies of the ben-Bella (1962-1965), bou-Medienne (1965-1978), and ben-Djedid (1978-1992) governments lacked the nationalist character to transform the Algerian society. The political structures were a consequence of a compromise between different social classes. The third chapter investigates the bourgeoisie manifest in the 1980s and its alliance with the nomenklatura to undermine the development of socialism. The fourth chapter discloses the role of the nomenklatura in subverting the workers' role in the enterprises, as well as its parasitory role in blocking the emergence of new industrial relations, by relying on clientelism, regionalism and ethnicity in building its power. In the fifth chapter, it is argued that the Algerian state, like its Arab counterparts, is basically instrumental and oppressive, and that its creation was forged in a colonial struggle rather than class antagonism. The sixth chapter discusses the collapse of the cultural sphere and the failure of Arabization in Algeria. The process of Arabization was a result of elitism rather than the outcome of a sophisticated plan. The seventh chapter investigates the Berber question and how the process of Arabization and compromise between secular and conservative forces in the 1960s, 1970s and the 1980s refused to recognize Berber particularism. The eight chapter discusses another rupture in the Algerian social formation: the emergence of the Islamists who are now in total war with the military Junta. The last chapter is devoted to a summary of the former arguments presented in the study and an attempt to forecast the future of Algeria.
Fiscal gridlock over the budget in Washington state: The politics and economics of pouring exempt wells into the prior appropriations bucket
Creators: name: Yoder, Jonathon
name: Yoder, Jonathon
Publisher: name: Unknown
Year: 2018
Subjects: Agricultural and Food Policy
Environmental Economics and Policy

description: Washington State has been in fiscal gridlock because a recent court case – the Hirst Decision (Hirst)--- would require counties to show legal availability of groundwater to issue permits for new rural residential wells that would be in connectivity with surface water. Many argued that this requirement would halt rural residential development in the state. This article examines the context and potential consequences of Hirst through an economic lens. For context, the characteristics of exempt wells and recent legal precursors are discussed. A qualitative assessment of the likely impacts of Hirst and the conditions that might alleviate its effects is provided, followed by potential institutional innovations that may emerge because of or in response to Hirst. These developments in Washington State illustrate some of the complexities of exempt wells common to many of the Western United States.
Continuities and discontinuities in the Algerian social formation
Creators: name: Zerougui, Abdelkader
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 44
subject: Human society
classificationCode: 4410
subject: Sociology
subject: FOS: Sociology

description: The Algerian social formation has experienced since independence a series of discontinuities and ruptures in its economic, political, social, linguistic and ethnic structures. My approach to this study is historical and analytical, and ascertains that these discontinuities cannot be looked at separately, but rather have to be merged for a comprehension of the events taking place in Algeria. The first chapter introduces the theoretical framework. The second chapter explores the development of the private sector and its impact on society. It is argued that the policies of the ben-Bella (1962-1965), bou-Medienne (1965-1978), and ben-Djedid (1978-1992) governments lacked the nationalist character to transform the Algerian society. The political structures were a consequence of a compromise between different social classes. The third chapter investigates the bourgeoisie manifest in the 1980s and its alliance with the nomenklatura to undermine the development of socialism. The fourth chapter discloses the role of the nomenklatura in subverting the workers' role in the enterprises, as well as its parasitory role in blocking the emergence of new industrial relations, by relying on clientelism, regionalism and ethnicity in building its power. In the fifth chapter, it is argued that the Algerian state, like its Arab counterparts, is basically instrumental and oppressive, and that its creation was forged in a colonial struggle rather than class antagonism. The sixth chapter discusses the collapse of the cultural sphere and the failure of Arabization in Algeria. The process of Arabization was a result of elitism rather than the outcome of a sophisticated plan. The seventh chapter investigates the Berber question and how the process of Arabization and compromise between secular and conservative forces in the 1960s, 1970s and the 1980s refused to recognize Berber particularism. The eight chapter discusses another rupture in the Algerian social formation: the emergence of the Islamists who are now in total war with the military Junta. The last chapter is devoted to a summary of the former arguments presented in the study and an attempt to forecast the future of Algeria.
Non-standard neutrino interactions in $U(1)'$ model after COHERENT data
Creators: name: Flores, L. J.
name: Nath, Newton
name: Peinado, E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We explore the potential to prove light extra gauge $Z^\prime$ boson inducing non-standard neutrino interactions (NSIs) in the coherent-elastic neutrino-nucleus scattering (CE$ ν$NS) experiments. We intend to examine how the latest COHERENT-CsI and CENNS-10 data can constrain this model. A detailed investigation for the upcoming Ge, LAr-1t, and NaI detectors of COHERENT collaboration has also been made. Depending on numerous other constraints coming from oscillation experiments, muon $ (g-2) $, beam-dump experiments, LHCb, and reactor experiment CONUS, we explore the parameter space in $Z^\prime$ boson mass vs coupling constant plane. Moreover, we study the predictions of two-zero textures that are allowed in the concerned model in light of the latest global-fit data.
description: 29 pages, 4 figures, 8 tables. Included analysis with latest CENNS-10 detector data. Discussion added. Version to appear in JHEP
Glass models on Bethe lattices
Creators: name: Rivoire, O.
name: Biroli, G.
name: Martin, O. C.
name: Mezard, M.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider ``lattice glass models'' in which each site can be occupied by at most one particle, and any particle may have at most l occupied nearest neighbors. Using the cavity method for locally tree-like lattices, we derive the phase diagram, with a particular focus on the vitreous phase and the highest packing limit. We also study the energy landscape via the configurational entropy, and discuss different equilibrium glassy phases. Finally, we show that a kinetic freezing, depending on the particular dynamical rules chosen for the model, can prevent the equilibrium glass transitions.
description: 24 pages, 11 figures; minor corrections + enlarged introduction and conclusion
Jet Sub-structure in Fireworks Emission from Non-uniform and Rotating Bose-Einstein Condensates
Creators: name: Fu, Han
name: Zhang, Zhendong
name: Yao, Kai-Xuan
name: Feng, Lei
name: Yoo, Jooheon
name: Clark, Logan W.
name: Levin, K.
name: Chin, Cheng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We show that jet emission from a Bose condensate with periodically driven interactions, a.k.a. "Bose fireworks", contains essential information on the condensate wavefunction, which is difficult to obtain using standard detection methods. We illustrate the underlying physics with two examples. When condensates acquire phase patterns from external potentials or from vortices, the jets display novel sub-structure, such as oscillations or spirals, in their correlations. Through a comparison of theory, numerical simulations and experiments, we show how one can quantitatively extract the phase and the helicity of a condensate from the emission pattern. Our work demonstrating the strong link between jet emission and the underlying quantum system, bears on the recent emphasis on jet sub-structure in particle physics.