124 research outputs found
James Stevens
No full text"Biography and criticism of fiction writer James Stevens (1892-1971), with detailed summaries of his Paul Bunyan stories and of novels Brawnyman, Mattock, and Big Jim Turner"--Provided by publisher
James Stevens
No full textBiography and criticism of fiction writer James Stevens (1892-1971), with detailed summaries of his Paul Bunyan stories and of novels Brawnyman, Mattock, and Big Jim Turner.https://scholarworks.boisestate.edu/fac_books/1203/thumbnail.jp
Chinese and English Infants’ Tone Perception: Evidence for Perceptual Reorganization.
No full textOver half the world’s population speaks a tone language, yet infant speech perception research has typically focused on consonants and vowels. Very young infants can discriminate a wide range of native and nonnative consonants and vowels, and then in a process of perceptual reorganization over the 1st year, discrimination of most nonnative speech sounds deteriorates. We investigated perceptual reorganization for tones by testing 6- and 9-month-old infants from tone (Chinese) and nontone (English) language environments for speech (lexical tone) and nonspeech (violin sound) tone discrimination in both cross-sectional and longitudinal studies. Overall, Chinese infants performed equally well at 6 and 9 months for both speech and nonspeech tone discrimination. Conversely, English infants’ discrimination of lexical tone declined between 6 and 9 months of age, whereas their nonspeech tone discrimination remained constant. These results indicate that the reorganization of tone perception is a function of the native language environment, and that this reorganization is linguistically based
Potassium binding adjacent to cationic transition metal fragments : unusual heterobimetallic adducts of a calix[4]arene-based thione ligand
No full textThe synthesis of cationic rhodium and iridium complexes of a bis(imidazol-2-thione) functionalised calix[4]arene ligand and their surprising capacity for potassium binding is described. In both cases uptake of the alkali metal into the calix[4]arene cavity occurs despite adverse electrostatic interactions associated with close proximity to the transition metal fragment (Rh+ ···K+ = 3.715(1) Å, Ir+ ···K+ = 3.690(1) Å). The formation and constituent bonding of these unusual heterobimetallic adducts has been interrogated through extensive solution and solid-state characterisation, examination of the host-guest chemistry of the ligand and its upper-rim unfunctionalised calix[4]arene analogue, and computationally using DFT-based energy decomposition analysis (EDA)
Understanding the anion-templated, OSDA-free, interzeolite conversion synthesis of high silica zeolite ZK-5
No full textFunding: Engineering and Physical Sciences Research Council (Grant Number(s): EP/S016201/1, Grant recipient(s): Paul A. Wright, Magdalena M. Lozinska; EP/L017008/1, EP/T019298/1, EP/R023751/1). Engineering and Physical Sciences Research Council (Grant Number(s): EP/S016147/1; Grant recipient(s): James Mattock, Paul A. Cox). Royal Society (Grant Number(s): INF\R2\192052; Grant recipient(s): Paul A. Wright).High silica zeolite ZK-5 (framework Si/Al=4.8) has been prepared by interzeolite conversion from ultrastable zeolite Y via a co-templating route using alkali metal cations and nitrate anions but without organic structure directing agents. The mechanism, which involves zeolite framework – alkali metal cation – nitrate anion ordering, has been established by a combination of chemical and thermal analyses, Raman spectroscopy, computational modelling, and X-ray powder diffraction. Ammonium exchange gives ZK-5 with occluded ammonium nitrate and subsequent heating gives microporous zeolite ZK-5.Peer reviewe
A Binuclear 1,1′-Bis(boratabenzene) Complex: Unprecedented Intramolecular Metal-Metal Communication through a B−B Bond
No full textWe report the synthesis of the first 1,1’-bis (boratabenzene) species by tetrabromodiborane(4) induced ring-expansion reactions of cobaltocene. Six equivalents of cobaltocene are required as the species plays the dual role of reagent as well as reductant to yield [{(?5-C5H5)Co}2{µ:?6,?6-(BC5H5)2}]. X-ray crystallographic analysis shows that the compound consists of coplanar BC5H5 rings which are coordinated on opposite faces to two cyclopentadienyl cobalt moieties, resulting in a trans-configured bimetallic complex. The formally dianionic bis(boratabenzene) moiety with a boron-boron single bond can be viewed as a symmetric dimer of the parent boratabenzene anion as well as the first example of a diboron analogue of biphenyl. The solution electrochemistry of the bimetallic complex shows four stepwise redox events, indicating significant intramolecular interaction between the cobalt ions across the 1,1’-bis(boratabenzene) unit. The magnetic properties, as investigated by variable-temperature SQUID magnetometry, reveal weak intramolecular antiferromagnetic interactions (J = -6.0 cm-1). Density Functional Theory calculations support the experimental results and add insights into the various electronic states of the complex
Efficient NiII2LnIII2Electrocyclization catalysts for the synthesis oftrans-4,5-diaminocyclopent-2-enones from 2-furaldehyde and primary or secondary amines
No full textA series of heterometallic coordination clusters (CCs) [NiII2LnIII2(L1)4Cl2(CH3CN)2] 2CH3CN [Ln = Y (1Y), Sm (1Sm), Eu (1Eu), Gd (1Gd), or Tb (1Tb)] were synthesized by the reaction of (E)-2-(2-hydroxy-3-methoxybenzylidene-amino)phenol) (H2L1) with NiCl2·6(H2O) and LnCl3·x(H2O) in the presence of Et3N at room temperature. These air-stable CCs can be obtained in very high yields from commercially available materials and are efficient catalysts for the room-temperature domino ring-opening electrocyclization synthesis of trans-4,5-diaminocyclopent-2-enones from 2-furaldehyde and primary or secondary amines under a non-inert atmosphere. Structural modification of the catalyst to achieve immobilization or photosensitivity is possible without deterioration in catalytic activity
Anti-Heroic Theme and Structure in Midwestern World War I Novels from Cather to Hemingway
No full textCompares the portrayal of World War I in A Farewell to Arms to Cather’s One of Ours (1922), claiming both depict modern warfare without glory or true heroism. Argues Hemingway was influenced by and improved upon Cather’s style and bipolar structure, despite his claims that her novel should not be taken seriously. Also includes examinations of Thomas Boyd’s Through the Wheat (1922) and James Stevens’s Mattock (1927)
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Computational design of iron(II)complexes with tuneable spin-state energetics
No full textHaving established and studied some of the unique properties of boron, these were applied to homoaromatic systems in order to acquire a measure of control over the strength of the through-space interaction. It became evident that the structural isomerism made possible by inserting boron centres in place of the more traditional carbocations results in significantly varied properties in similar and closely-related compounds. The variation of the strength of aromaticity allows for a perturbation in the immediate electronic environment of donor atoms to metal centres thus leading to the modulation of the relative electronic energy difference of the different spin-states of the resulting complexes. The results suggest a possible application to controlled spin-state switching technologies, for instance in the design of spin-switchable materials including stable fully controllable room-temperature spin-crossover compounds. Chapter 1 includes a discussion of relevant literature setting the context. Chapter 2 comprises a concise summary of work undertaken with multiple experimental groups to identify and characterise properties of boron compounds, this using DFT methodologies to provide a rationale for experimentally observed phenomena. Chapter 3 describes the design of a set of homoaromatic candidates stabilised with NHCs and Chapter 4 focuses on functionalising these compounds with a view towards increased exploitability. Chapter 5 assesses the viability of using an electron localisation method to identify through-space interactions. Chapter 6 documents the optimisation of the singlet excited state of [Fe(Phen)2(NCS)2] via a novel method that circumvents the usual complications of optimising these complex excited states for SCO complexes with the [Fe(bipy)3]2+ complex being included as a control. The methodologies and compound design from the preceding Chapters are collated in Chapter 7 where a homoaromatic ligand set based on a boron derivative of the homotropylium cation is designed and characterised and then applied to create a perturbation to control the spin-state energetics of a defined system. This is followed by a brief description of the possible directions of future work
Lexical Tone Perception in Infants and Young Children: Empirical Studies and Theoretical Perspectives
No full textThis eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contac
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