182,156 research outputs found
Proper Ferroelectricity in the Dion?Jacobson Material CsBi2Ti2NbO10: Experiment and Theory
No full textA diverse range of materials and properties are exhibited by layered perovskites. We report on the synthesis, characterization, and computational investigation of a new ferroelectric?CsBi2Ti2NbO10, an n = 3 member of the Dion?Jacobson (DJ) family. Structural studies using variable temperature neutron powder diffraction indicate that a combination of octahedral rotations and polar displacements result in the polar structure. Density functional theory calculations reveal that the wider perovskite blocks in CsBi2Ti2NbO0 stabilize proper ferroelectricity, in contrast to the hybrid-improper ferroelectricity reported for all other DJ phases. Our results raise the possibility of a new class of proper ferroelectric materials analogous to the well-known Aurivillius phases
Oscar B. Jacobson Collection
No full textPhotograph of L to R: Tsa-To-Ke, Hokeah, Mopope, Jacobson, Asah, and Auchiah, c. spring 1930
Gary C. Jacobson & Samuel Kernell. — Strategy & Choice in Congressional Elections
No full textCoyle Dauphin Joanne. Gary C. Jacobson & Samuel Kernell. — Strategy & Choice in Congressional Elections. In: Revue Française d'Etudes Américaines, N°20, mai 1984. Sexualité, érotisme dans la littérature américaine. p. 300
Ultrastable and efficient slight-interlayer-displacement 2D Dion-Jacobson perovskite solar cells
No full textStability has been a long-standing concern for solution-processed perovskite photovoltaics and their practical applications. However, stable perovskite materials for photovoltaic remain insufficient to date. Here we demonstrate a series of ultrastable Dion−Jacobson (DJ) perovskites (1,4-cyclohexanedimethanammonium)(methylammonium)n−1PbnI3n+1 (n ≥ 1) for photovoltaic applications. The scalable technology by blade-coated solar cells for the designed DJ perovskites (nominal n = 5) achieves a maximum stabilized power conversion efficiency (PCE) of 19.11% under an environmental atmosphere. Un-encapsulated cells by blade-coated technology retain 92% of their initial efficiencies for over 4000 hours under ~90% relative humidity (RH) aging conditions. More importantly, these cells also exhibit remarkable thermal (85 °C) and operational stability, which shows negligible efficiency loss after exceeding 5000-hour heat treatment or after operation at maximum power point (MPP) exceeding 6000 hours at 45 °C under a 100 mW cm−2 continuous light illumination.Full Tex
Die Säkularfeier in der Jacobson-Schule zu Seesen am Harz : zur Erinnerung an den Stifter Israel Jacobson
No full textEnthält: Chronologisches Verzeichnis der Schüler der Jacobson-Schule von der Gründung der Anstalt 1801 bis 1868, zs.gest. von C. Gürbic
Tuberculosis and the creative mind / by Arthur C. Jacobson.
No full text"Reprinted from Medical Library and Historical journal, December, 1907 and from the Aesculapian, December, 1908."Mode of access: Internet
Semicrossed Products, Dilations, and Jacobson Radicals
No full textWe compute the C*-envelope of the isometric semicrossed product of a C*-algebra arising from number theory by the multiplicative semigroup of a number ring R, and prove that it is isomorphic to T[R], the left regular representation of the ax+b-semigroup of R. We do this by explicitly dilating an arbitrary representation of the isometric semicrossed product to a representation of T[R] and show that such representations are maximal.
We also study the Jacobson radical of the semicrossed product of a simple C*-algebra and either a subsemigroup of an abelian group or a free semigroup. A full characterization of the Jacobson radical is obtained for a large subset of these semicrossed products and we apply our results to a number of examples
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
Gary C. Jacobson and the Politics of Congressional Elections
No full textAbstractGary Jacobson is one of the world’s leading experts studying US congressional elections. This essay examines his contributions to political science over the past 40 years.</jats:p
Through the Fictive to the Real(ish): Affective Time and the Representation of “Real Newfoundland” in Rising Tide Theatre’s Trinity Pageant
No full textIn this article, Jacobson examines the ways in which the Trinity Pageant in Trinity, Newfoundland, Canada aims to animate local culture through a two-hour walking tour around the town’s historic sites that is largely predicated on a sense of realness. Using interviews with audience members and the pageant’s director Donna Butt as primary source material, Jacobson considers the perception and function of realness in the pageant’s re-enactment. She first uses theories of site-specificity, historical re-enactment, and theatrical time to consider the various forms of the “real” at work in the production. Jacobson then suggests the work that might be accomplished by such affectively real performance, as both a marker and maker of real identity, supported by the theories of Elin Diamond and Erin Hurley. Using concepts from Rebecca Schneider and Tracy C. Davis, Jacobson also argues that the affective time created by the pageant’s blending of past history and present-day performance creates a future imperative in which audience members are compelled to save the authentic culture they have just witnessed. Finally, she considers the implicitly conservative preservationist impulse that underscores the pageant’s re-enactment to trouble notions of inclusion, belonging, and community.Dans cette contribution, Kelsey Jacobson examine comment le Trinity Pageant, un spectacle présenté à Terre-Neuve, cherche à illustrer la culture locale au moyen d’une visite à pied de deux heures des lieux historiques du village de Trinity qui repose en grande partie sur un sentiment de réalité. En se servant comme source primaire d’entretiens menés avec des membres du public et la metteure en scène du spectacle, Donna Butt, Jacobson s’intéresse à la perception et à la fonction du réel dans la reconstitution que propose le spectacle Trinity Pageant. S’appuyant dans un premier temps sur des théories liées à la spécificité au lieu, à la reconstitution historique et au temps théâtral, Jacobson examine les diverses formes du « réel » qui sont à l’œuvre dans cette production. À l’aide de théories formulées par Elin Diamond et Erin Hurley, elle fait ensuite ressortir le travail que peut accomplir un spectacle reposant sur l’affect de la réalité pour marquer et créer l’identité réelle. Des concepts empruntés à Rebecca Schneider et Tracy C. Davis permettent à Jacobson de faire valoir que le temps affectif créé par le spectacle en fusionnant l’histoire du passé à la représentation dans l’instant présent crée un impératif futur où les membres du public sont appelés à sauvegarder la culture authentique dont ils viennent de témoigner. Pour conclure, Jacobson s’intéresse à la pulsion de conservation qui sous-tend implicitement ce spectacle de reconstitution pour troubler les notions d’inclusion, d’appartenance et de communauté
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