56,781 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
Ocyplanus megalops JACOBSON & KISTNER 1983
No full textOcyplanus megalops JACOBSON & KISTNER 1983 Ocyplanus megalops JACOBSON & KISTNER 1983: 33. M a t e r i a l:1, O. Afrika, Gomba, lux, leg. Inst. Amani (MNHUB). D i s t r i b u t i o n: Zaire, Gambia, Ivory Coast, Ghana.Published as part of Pace, R., 2012, New data and new species of Aleocharinae from Tropical Africa in the Natural History Museum of the Humboldt University, Berlin (Coleoptera, Staphylinidae), pp. 1331-1362 in Linzer biologische Beiträge 44 (2) on page 1342, DOI: 10.5281/zenodo.533529
Labidostomis (Labidostomis) transitoria Jacobson 1901
No full text<i>Labidostomis</i> (<i>Labidostomis</i>) <i>transitoria</i> Jacobson, 1901 <p> <b>References.</b> Jacobson 1901: 106.</p> <p> <b>Distribution.</b> Asian Russia (Altai, S Siberia).</p> <p> <b>Material Examined.</b> Krasnoyarsk, v.1912, 56 3♀ (Troitskaya) (ZIN); Akademgorodok, Nikolaevskaia hill., 17.vi.2012, 2 6 1 ♀ (E. Akulov) (EACK).</p> <p> <b>Notes.</b> Type locality: Krasnoyarsk (Krasnoyarsky Krai). Described from one female collected by J. Sahlberg (Jacobson 1901).</p>Published as part of <i>Guskova, Elena V., Akulov, Evgeny N. & Loshchev, Sergey M., 2018, The Cryptocephalinae (Coleoptera: Chrysomelidae) of the Krasnoyarsk Krai (except for the Taymyrsky Dolgano-Nenetsky District), Siberia, Russia, pp. 565-576 in The Coleopterists Bulletin 72 (3)</i> on page 569, DOI: 10.1649/0010-065X-72.3.565, <a href="http://zenodo.org/record/5384174">http://zenodo.org/record/5384174</a>
East Building of the National Gallery of Art, Washington, 1978
No full textArchitectes: I. M. Pei, Leonard Jacobson.; Firme d'architectes: I. M. Pei & Partners.; Firme d'architectes-paysagistes: Office of Dan Kiley.; Date de la fin des travaux de construction: 1978.; Sur la diapositive: AAm-0509.; Photographie: Hartill Art Associates.
East Building of the National Gallery of Art, Washington, 1978
No full textArchitectes: I. M. Pei, Leonard Jacobson.; Firme d'architectes: I. M. Pei & Partners.; Firme d'architectes-paysagistes: Office of Dan Kiley.; Date de la fin des travaux de construction: 1978.; Sur la diapositive: AAm-0505.; Photographie: Hartill Art Associates.
East Building of the National Gallery of Art, Washington, 1978
No full textArchitectes: I. M. Pei, Leonard Jacobson.; Firme d'architectes: I. M. Pei & Partners.; Firme d'architectes-paysagistes: Office of Dan Kiley.; Date de la fin des travaux de construction: 1978.; Sur la diapositive: AAm-0512.; Photographie: Hartill Art Associates.
Kempnyia neotropica Jacobson & Bianchi
No full text<i>Kempnyia neotropica</i> (Jacobson & Bianchi) <p> <i>Perla obscura</i> Pictet 1841: 269 (n. praeocc.).</p> <p> <i>Perla neotropica</i> Jacobson & Bianchi 1905: 617.</p> <p> <i>Kempnyia neotropica;</i> Zwick 1972: 1168.— Zwick 1973b: 276. ― Bispo & Froehlich 2004: 2. ─ Bispo & Froehlich 2008: 62.— Froehlich 2010: 181.— Froehlich 2011: 133.</p> <p> <b>Material examined.</b> BR, SP, Campos do Jordão, PECJ, Córrego Galharada, 1 m +ex., XII/1986 – I/1987, YAT, CGF; 1 m, 20/XI/1987, CGF, LGO, MJNF, GMC; 3 m, 14–16/XII/1987, CGF, LGO; 1 m, 06/XII/1996, CGF, ASM. Pindamonhangaba, Fazenda São Sebastião do Ribeirão Grande, Reserva Florestal Votorantim, Córrego do Cedro, 22°45’S, 45°28’W, ca. 600m asl, 5 m, 21/XII/1998, ASM; 1 f, 11/I/1999, ASM & al.</p> <p> <b>Remarks.</b> This dark species is widespread in Southeast and South Brazil (Froehlich 2011) and is found also in Goiás State (Bispo & Froehlich 2008).</p>Published as part of <i>Froehlich, Claudio G., 2011, Kempnyia (Plecoptera) from the Mantiqueira Mountains of Brazil, pp. 20-32 in Zootaxa 2999</i> on page 22, DOI: <a href="http://zenodo.org/record/203030">10.5281/zenodo.203030</a>
Harold K. Jacobson (1929-2001): An Appreciation
No full textHarold Jacobson was born in Detroit onJune 28,1929. He attended high school in Wyandotte, Michigan, and received a bachelor\u27s degree in history from the University of Michigan. He married his Michigan schoolmate Merelyn Jean Lindbloom in 1951, a year after he started graduate school at Yale.
He was fundamentally an optimist about human behavior; he opened his path-breaking text, Networks of Interdependence, with the words, This is an optimistic book, though I hope not an unrealistic one.
Thus did Jacobson begin a career-long association with many whose work was rooted in international law. This interest led to fruitful collaborations and innovative contributions to the international law literature.
His insatiable curiosity, open-mindedness, delight in discovery, and appreciation of people were grounded in a strong sense of his own community and identity.
An inspired and devoted teacher, Jacobson achieved excellence by fostering it
On the Jacobson radical of graded rings
No full textsummary:All commutative semigroups are described such that the Jacobson radical is homogeneous in each ring graded by
Finite rank operators in Jacobson radical {\scr R}\sb{{\scr N}\otimes{\scr M}}
No full textsummary:In this paper we investigate finite rank operators in the Jacobson radical of , where , are nests. Based on the concrete characterizations of rank one operators in and , we obtain that each finite rank operator in can be written as a finite sum of rank one operators in and the weak closure of equals if and only if at least one of , is continuous
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