605 research outputs found

    PHILIP D. CURTIN — Cross-Cultural Trade in World History.

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    Alien Registration- Mcginnis, David A. (Brewer, Penobscot County)

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    https://digitalmaine.com/alien_docs/10711/thumbnail.jp

    Synthesis and Coordination Chemistry of Azulene- and Ferrocene-Based Isocyanide Ligands

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    Nonbenzenoid aromatic isocyanides feature attractive structural and electronic properties for the potential design of optoelectronic devices. Prior to the work of Barybin and coworkers, examples of nonbenzenoid isocyanides were limited to isocyanoferrocene and 1,1'-diisocyanoferrocene. This thesis describes the design of nonbenzenoid isocyanides featuring ferrocene and/or azulene moieties. The first nonbenzenoid aromatic isocyanide featuring both azulene and ferrocene in one molecule is described. Electrochemical results indicate stable redox activity leading to the potential use in the design of redox-addressable materials. A new bis-iridium complex of 1,1'-diisocyanoferrocene was synthesized and showed the possible existence of two isomeric forms when in solution. Redox properties indicate reversibility which is likely iron-based. Preliminary crystallographic data for this complex features a symmetrical structure with C-N-C angles of approximately 176°. A synthetic pathway for the formation of 2,2'-diisocyano-6,6'-biazulenylacetylene π-linker is documented. This diisocyanide exhibits a relatively stable stepwise two-electron reduction process on the electrochemical time scale indicating the likelihood of a closed shell dianion. Coordination chemistry of the mono and dinuclear tungsten diisocyanide complexes illustrates evidence for a metal-to-bridge charge-transfer. A self assembled monolayer of the ligand coordinated to Au(111) indicates an upright orientation when on the surface. Synthesis of a tetranuclear(I) gold rectangle featuring the 2,2'-diisocyano-6,6'-biazulenyl linker is presented and its interesting luminescent properties will be compared to relevant complexes. A crystallographically defined half gold ring featuring the 2-isocyanoazulenyl moiety exhibits an aurophilic interaction between two Au(I) centers. An optimized regioselective amination of 2,2'-biazuene is presented in good yield. This ligand undergoes a stepwise, reversible two-electron reduction according to an electrochemical study . This ligand acts as a precursor to the targeted 6-isocyano-2,2'-biazulene. The formation of a self assembled monolayer featuring 6-isocyano-2,2'-biazulene coordinated in an upright fashion on a Au(111) surface is mentioned. The first accessible planar-chiral isocyanide ligand is presented in high enantiomerically purity. This ligand exhibits robust redox activity upon coordination on the electrochemical time scale. Results from the electrochemical studies in addition to the other spectroscopic evidence will be presented

    Relic Challenges for Vector-Like Fermions as Connectors to a Dark Sector

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    New dark sectors consisting of exotic fields that couple only very feebly to the Standard Model (SM) have strong theoretical motivation and may be relevant to explaining the abundance of dark matter (DM). An important question for such sectors is how they connect to the SM. For a dark sector with a new gauge interaction, a natural connection arises from heavy vector-like fermions charged under both the visible and dark gauge groups. The gauge charges of such fermions imply that one or more of them is stable in the absence of additional sources of dark symmetry breaking. A generic challenge for such connectors is that they can produce too much dark matter or interact too strongly with nuclei if they were ever thermalized in the early universe. In this paper we study this challenge in a simple connector theory consisting of new vector-like electroweak doublet and singlet fermions that also transform under the fundamental representation of a new (Abelian) gauge force, and we show that these connectors in their minimal form are almost always ruled out by existing direct DM searches. To address this challenge, we investigate two solutions. First, we study mitigating scattering on nuclei by introducing a Majorana mass term for the singlet. And second, we investigate a mixing with SM leptons that allows the connectors to decay while remaining consistent with cosmological tests and searches for charged lepton flavor violation. Both solutions rely on the presence of a dark Higgs field with a specific charge.Comment: 32 pages, 5 figures, added references, corrected plotting error, conclusions unchange

    Reaction to the Arthurs Report

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    It is now more than two years since the publication of Law and Learning: The Report of The Consultative Group on Research and Education in Law to the Social Sciences and Humanities Research Council of Canada, known to all legal academics as the Arthurs Report . In that time the Canadian Bar Review has published one commentary on the Report and there have been a few comments in academic law journals, but the reaction in print is not commensurate with the importance of the Report or the interest in it among teachers and scholars of law in Canada generally and at the Dalhousie Law School in particular. Moreover, it is important not only to Canada\u27s law faculties and the practicing legal profession but also to scholars in related disciplines, to the teachers and advisors of future law students and to those future law students themselves. All will do well to understand the implications of the Report, and their contributions would enrich any debate about its findings and recommendations

    Kurrburra the Boonwurrung 'wirrirrap' and bard (1797-1849)-a man of high degree

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    Kurrburra (aka Mr Ruffy) (1797-1849), Aboriginal wirrirrap (doctor, healer, bard), sage counsellor of his people, consultant with koalas, and heroic slayer of a feared orangutan-like cryptid that lived in the ranges north of Western Port, is believed to have been born in 1797, and was a member of the Yawen djirra clan, the eastern-most group of the Boonwurrung People whose Country stretched from Wirribi-yaluk (Werribee River) to Wammun (Wilsons Promontory) in Victoria. His moiety was Bunjil and in the early 1840s he had 2 wives: Kurundum (1819-?) and Bowyeup (1823-?), and 2 children, whose names are not known. Kurrburra's traditional Aboriginal name is the Boonwurrung word for the iconic marsupial Phascolarctos cinereus, more commonly known as the koala

    Exile Vol. XXXIII No. 1

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    ARTWORK Treetops by Jane Smith (cover) Wreath on Chair by Eliza Brown 1 Pencil Drawing of Wood by Holly Trotter 5 Falling State II -Dark by Terri J. Wolf 10 Falling State II -Light by Terri J. Wolf 11 Secretly, Deep Down by Terri J. Wolf 15 Water & Trees by William (Woody) Woodroof 19 POETRY Busting the Fence by C. E. McGinnis 4 Big Scissors by Amy Becker 14 The Woman Below Me by Karen J. Hall 8 On Choctawatchee Bay by David Zivan 18 H2O by Amy Becker 7 The Unfathomable by Amy Becker 3 Together, Bathing by Karen J. Hall 13 The Day Before by Debra Benko 1
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