166,867 research outputs found
Infrared evidence of a Slater metal insulator transition in NaOsO3
No full textThe magnetically driven metal insulator transition MIT was predicted by Slater in the fifties. Here a long range antiferromagnetic AF order can open up a gap at the Brillouin electronic band boundary regardless of the Coulomb repulsion magnitude. However, while many low dimensional organic conductors display evidence for an AF driven MIT, in three dimensional 3D systems the Slater MIT still remains elusive. We employ terahertz and infrared spectroscopy to investigate the MIT in the NaOsO3 3D antiferromagnet. From the optical conductivity analysis we find evidence for a continuous opening of the energy gap, whose temperature dependence can be well described in terms of a second order phase transition. The comparison between the experimental Drude spectral weight and the one calculated through Local Density Approximation LDA shows that electronic correlations play a limited role in the MIT. All the experimental evidence demonstrates that NaOsO3 is the first known 3D Slater insulato
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
CURIE-TEMPERATURE "SLATER-PAULING CURVE"
No full textThe systematic variation of the Curie-temperature "Slater-Pauling curve" has been explained for the first time on the basis of the finite-temperature theory of the local environment effect. The peculiarity of the Curie temperatures in Fe-V, Fe-Ni, and Ni-Mn alloys is elucidated by using the effective exchange couplings
O estado peruano e as crises regionais - o desenvolvimento da movimentos regionais, 1968-1980
No full textThis study is about the social movements of Latin America through which they were located in Peru, after his experience in Dar es Salaam (Tanzania) the author (Slater) introduces us to development studies from radical geography, it is the exploration of the power of peasant social movements, contrary to what most social scientists studied as labor movements from central countries. Having a postcolonial position from radical geography, it also explores the territorialities of the wage earners of the coastal cities and of the regional peasant movements of the interior of Peru, studying the contradictions of capital and wage labor and registering the non-wage labor that existed before the agrarian reform of the military government of Velasco Alvarado. I also record the “other” non-capitalist forms of production that persisted as alternative territorialities based on democracy, citizen participation and the struggle against the hegemonic and disorderly Peruvian capitalism, as well as identifying the gaps or errors of state intervention in the provincial territories from the hegemonic capital city. Peruvian of a military regime that declared itself revolutionary, which also did not dare to call it reformist. He focused on two social movements, one in the south of Peru in Arequipa and the other in the east of the country in Pucalpa.Este estudio es sobre los movimientos sociales de Latinoamerica a través de los que se ubicaban en el Perú, luego de su experiencia en Dar es Salaam (Tanzania) el autor (Slater) nos introduce a los estudios del desarrollo desde la geografía radical, es la exploración del poder de los movimientos sociales campesinos, contrario a lo que la mayoría de científicos sociales estudiaban como los movimientos obreros desde los países centrales. Al tener una posición postcolonial desde la geografía radical también explora las territorialidades de los asalariados de las ciudades costeras y de los movimientos regionales campesinos del interior del Perú, estudiaba las contradicciones del capital y el trabajo asalariado y registro el trabajo no asalariado que existía antes de la reforma agraria del gobierno militar de Velasco Alvarado. También registro las “otras” formas de producción no capitalistas que persistían como territorialidades alternativas desde la democracia, participación ciudadana y lucha al hegemónico y desordenado capitalismo peruano, además identifico los vacíos o errores de la intervención estatal en los territorios provincianos desde la hegemónica ciudad capital peruana de un régimen militar que se declaró revolucionario, que tampoco se atrevió a decirle reformista. Se centro en dos movimientos sociales uno al sur del Perú en Arequipa y el otro al oriente del país en Pucalpa.Este estudo trata dos movimentos sociais da América Latina através dos quais se localizaram no Peru, após sua experiência em Dar es Salaam (Tanzânia) o autor (Slater) nos introduz aos estudos de desenvolvimento desde a geografia radical, é a exploração do poder da movimentos sociais camponeses, ao contrário do que a maioria dos cientistas sociais estudou como movimentos operários dos países centrais. Tendo uma posição pós-colonial a partir da geografia radical, ele também explora as territorialidades dos assalariados das cidades litorâneas e dos movimentos camponeses regionais do interior do Peru, estudou as contradições do capital e do trabalho assalariado e registrou o trabalho não assalariado que existia antes da reforma agrária do governo militar de Velasco Alvarado. Também registro as “outras” formas de produção não capitalistas que persistiram como territorialidades alternativas baseadas na democracia, na participação cidadã e na luta contra o capitalismo hegemônico e desordenado peruano, bem como identifico as lacunas ou erros de intervenção do Estado nos territórios provinciais da hegemônica capital peruana de um regime militar que se declarava revolucionário, que também não ousava chamá-lo de reformista. Concentrou-se em dois movimentos sociais, um no sul do Peru em Arequipa e outro no leste do país em Pucalpa
Slater screening constants in atomic and molecular orbitals
No full textSlater screening constants in atomic and molecular orbital
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Polarizable Drude Model with s-type Gaussian or Slater Charge Density for General Molecular Mechanics Force Fields
No full textSubmitted manuscript that describes derivation of atomic polarization and exponents for Gaussian or Slater distribution functions to describe polarizable atoms in force fields. Parameters are provided based on the General Amber Force Field, for H, C, N, O, F, P, S, Cl, Br, I.<br /
Error bounds for nondifferentiable convex inequalities under a strong Slater constraint qualification
No full textA global error bound is given on the distance between an arbitrary point in the n-dimensional real space R^n and its projection on a nonempty convex set determined by m convex, possibly nondifferentiable, inequalities. The bound is in terms of a natural residual that measures the violations of the inequalities multiplied by a new simple condition constant that embodies a single strong Slater constraint qualification (CQ) which implies the ordinary Slater CQ. A very simple bound on the distance to the projection relative to the distance to a point satisfying the ordinary Slater CQ is given first and then used to derive the principal global error bound.
Larry O. Spencer, Conference Author Presentation
No full textGen. Larry O. Spencer, USAF (Ret.), author of Dark Horse: A Journey from the Horseshoe to the Pentago
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