58,540 research outputs found
Catalogue of Central College Library, at Fayette, Mo. 1887
No full textPamphlet entitled "Catalogue of Central College Library at Fayette, Mo. 1887." 57 pages. 15.5 cm high. Has index of author names, possibly missing some pages. Several writings in pencil and stray pencil marks
Electrical, morphological and structural properties of RF magnetron sputtered Mo thin films for application in thin film photovoltaic solar cells
No full textMolybdenum (Mo) thin films were deposited using radio frequency magnetron sputtering, for application as a metal back contact material in ‘‘substrate configuration’’ thin film solar cells. The variations of the electrical, morphological, and structural properties of the deposited films with sputtering pressure, sputtering power and post-deposition annealing were determined. The electrical conductivity of the Mo films was found to increase with decreasing sputtering pressure and increasing sputtering power. X-ray diffraction data showed that all the films had a (110) preferred orientation that became less pronounced at higher sputtering power while being relatively insensitive to process pressure. The lattice stress within the films changed from tensile to compressive with increasing sputtering power and the tensile stress increased with increasing sputtering pressure. The surface morphology of the films changed from pyramids to cigar-shaped grains for a sputtering power between 100 and 200 W, remaining largely unchanged at higher power. These grains were also observed to decrease in size with increasing sputtering pressure. Annealing the films was found to affect the resistivity and stress of the films. The resistivity increased due to the presence of residual oxygen and the stress changed from tensile to compressive. The annealing step was not found to affect the crystallisation and grain growth of the Mo films
Unusually heavy stable Mo isotope signatures of the Ottawa River: Causes and implications for global riverine Mo fluxes
No full textThe accurate use of Mo isotope mass balance modelling of ancient oceans relies on the assumption that the δ98Mo of modern riverine inputs represents a reasonable estimate of the past. A growing number of studies of global rivers have demonstrated significant variation in δ98Mo from the bedrock sources of Mo. The Ottawa River, Canada, was previously identified as having an anomalously heavy Mo isotope composition, with a δ98Mo signature close to seawater (2.3‰), for a seemingly pristine natural river. To further explore this unusual signature, we collected and filtered 29 water samples from the Ottawa River, tributaries, and small lakes, and analysed them for Mo isotopes as well as major and trace elements. Here, we fully document heavy δ98Mo signatures throughout the Ottawa River and its absence in surrounding areas of the wider Ottawa River basin (ORB). Our results reveal a progressive upstream increase in both Mo concentration and δ98Mo signatures in the Ottawa River towards values even heavier than seawater, up to 3.13‰ – the heaviest Mo isotopic signature of river water measured to date. In contrast, the tributaries and lakes display far lighter and more consistent δ98Mo signatures within the range previously found in other rivers. Weathering of an isotopically heavy bedrock source, fractionation during weathering and retention of light isotopes in soils have all been proposed as sources of heavy δ98Mo in rivers; however, none of these mechanisms can satisfactorily explain our new observations. Colloidal and particulate processes that remove elements downstream, as inferred from some trace element proxies, also cannot explain the decreasing δ98Mo, since the preferential removal of light Mo isotopes is predicted from these processes. Similarly, the downstream trends show no apparent relationships with constructed dams or known potential industrial sources. Therefore, our findings from the Ottawa River are best explained as the dilution of a yet unidentified point source of heavy Mo upstream of sampling, or a significant permanent sink for light isotopes existing only in the upper reaches of the catchment. In both cases, anthropogenic contribution from a large mining district in the headwaters of the river must be considered and should be explored further. Fractionation of Mo in waste rock storage facilities have been previously identified and may provide an unnatural sink for isotopically light Mo through the Rayleigh-type fractionation of dissolved Mo on oxyhydr(oxide) mineral surfaces. The implied anthropogenic alteration of the natural Mo cycle highlights the significant and wide-reaching effects of unnatural point sources of Mo on the cumulative δ98Mo signatures of the catchment, and emphasises the necessity for detailed geochemical screening of anomalous river water isotope signatures before natural isotope compositions are inferred
Studies on Bis(imido) molybdenum complexes containing unsaturated hydrocarbon ligands
No full textThis thesis describes the synthesis and characterisation of molybdenum bis(imido) complexes containing unsaturated hydrocarbon ligands. A principal objective of the work was to examine the effect of various imido substituents on the coordination number of the complex and the orientations adopted by olefin and acetylene ligands. Chapter One highlights areas of transition metal chemistry relevant to the thesis, with particular emphasis on the psuedo-isolobal analogy between cyclopentadienyl and imido ligands, A convenient one-pot synthesis of molybdenum bis(imido) complexes of the type Mo(NR)(NR')Cl(_2).DME (R=R'=l-adamantyl, 2-t- BUC(_6)H(_4); R=2,6-i-Pr(_2)C(_6)H(_3), R'=t-Bu) is described in Chapter Two. Mo(N-l- adamantyl)(O)Cl(_2).DME has been synthesised, and its structure determined by single crystal X-ray diffraction.- The preparation of olefin complexes Mo(NR)(NR')(C(_2)H(_4))(PMe(_3))n (R=R'=l-adamantyl, n=l; R=R'=2-t-BuC(_6)H(_4), n=2; R=2,6-i-Pr(_2)C(_6)H(_3), R'=t- Bu, n=l) is outlined in Chapter Three. Structural information derived from NMR data has allowed comparison with metallocene-like olefin adducts. Chapter Four describes the synthesis of complexes containing σ-bound phenyl ligands (Mo(NR)(NR')(σ-C(_6)H(_5))(PMe(_3)) (R=R'=l-adamantyl, 2-t-BuC(_6)H(_4); R=2,6-i-Pr(_2)C(_6)H(_3), R'=t-Bu)) as potential precursors to benzyne complexes. Chapter Five describes the preparation of diphenylacetylene complexes Mo(NR)(NR')(PhC=CPh)(PMe(_3)), structural information derived from NMR data allows comparison with previously known metallocene-like acetylene complexes. Full experimental details for Chapters Two to Five are given in Chapter Six
A Cartouche, Louisiana Purchase Exposition, St. Louis, Mo.
No full textSection of Cartouche carved by P. Wiehle (who also sculpted for the 1893 Columbia Exposition Administration Buildin)g ; stamped "G.W. Byrd
Revealing the influence of Mo addition on interphase precipitation in Ti-bearing low carbon steels
No full textMo is widely used as an effective microalloying element to improve mechanical performance of interphase precipitation steels, but the precise role of Mo in interphase precipitation behavior is not fully understood. In this contribution, interphase precipitation behavior in a series of Ti-Mo-bearing low carbon steels is systematically studied, and the role of Mo in interphase precipitates and its coarsening behavior is revisited. It is found that (Ti, Mo)C precipitates instead of TiC are formed in the Mo-containing alloys, and the average site fraction of Mo in (Ti, Mo)C is almost independent of the bulk Mo content. Moreover, the number density of interphase precipitates can be substantially enhanced by a minor addition of Mo, albeit it does not further rise with increasing the bulk Mo content. This is because the Mo fraction in (Ti, Mo)C rather than the bulk Mo content governs the driving force for precipitation nucleation and the interfacial energy of the (Ti, Mo)C/α and (Ti, Mo)C/γ interfaces. In addition to the reduced interfacial energy, decrease of Ti trans-interface diffusivity has been identified as another key reason for the enhanced carbide coarsening resistance in Mo-containing alloys.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Novel Aerospace Material
Avatars of the author in Mo Yan's novels
No full textL’écrivain chinois Mo Yan a mis en scène dans son œuvre romanesque des avatars de l’auteur, identifiés à lui par le nom dans deux romans et par le rôle de créateur du récit dans plusieurs récits. Ces représentants ne sauraient être identifiés à l’auteur empirique, mais peuvent être interprétés à l’aune de ce que représente pour nous l’auteur, au sens large, ou dans une visée individuelle, lorsque nous analysons leur caractérisation en fonction d’autres textes, fictifs ou référentiels, construisant la figure biographique, théorique et fantasmatique de l’auteur. Outre qu’elle joue sur l’aporie de sa présence dans la fiction, cette représentation métafictionnelle a des fonctions diverses. Dans Le Pays de l’alcool, elle souligne l’allégorie tout en déjouant la censure ; dans La Dure Loi du karma, elle brosse un portrait comique du romancier, reflétant ses différents rôles pour le lecteur et la société. La suite de l’étude porte sur des narrateurs révélant un statut de créateur du récit, de sorte qu’ils provoquent une distanciation et un doute sur leur situation diégétique, en les associant à une tendance métafictionnelle présente dans l’œuvre de Mo Yan depuis son premier roman long, Le Clan du sorgho rouge, où elle est l’effet d’un narrateur omniscient et présent dans l’univers de la fiction. Ces figures d’autorité thématisent l’imagination à l’œuvre, tout en signalant l’altérité de la figure de l’auteur que le lecteur infère de ses indices supposés. Elles représentent l’auteur en une logique non référentielle, comme produit d’un ensemble mouvant d’hypothèses, issues d’une interprétation des récits comme éléments constitutifs de l’œuvre.In his fictional works, Chinese novelist Mo Yan created avatars of the author, who are either identified by their name such as the characters Mo Yan in The Republic of Wine and in Life and Death Are Wearing Me Out or by a creative role they reveal, in other narratives. Both doubles, Mo Yan’s fictional homonyms, cannot be considered as the empirical author, and yet may be interpreted in the light of what the author means to us, whether in a broad or individual sense, when their characteristics are confronted with the biographical, theoretical and fantasmatic figure of Mo Yan which other texts create. Drawing attention to the aporetical presence of the author in a universe he created, metafictional author representations have various functions. In The Republic of Wine, it enlights the allegorical value of the novel and, to the real author, is a means to deter censorship. In Life and Death Are Wearing Me Out, Mo Yan is a parody of a novelist, where the role he plays for the reader and in society appear in a nutshell. Next, the sign of the author is to be extended to other narrators who reveal, more or less explicitly, that they create the narrative, thus inducing readers to suspend belief and reconsider their diegetic posture. Beginning with his first long novel Red Sorghum, metafiction has been an obsessive tendency in Mo Yan’s novels, making imagination a theme of the novel while suggesting the figure of the author a reader infers from the text is but a shifting body of hypotheses, which envision narratives a part of the whole works that make the author
A NEGATIVE ION PHOTOELECTRON SPECTROSCOPIC AND COMPUTATIONAL STUDY OF Mo AND Mo
No full textAuthor Institution: Department of Chemistry, University of Minnesota, Minneapolis, MN 55455We report the 488 and 514 nm anion photoelectron spectra of Mo. Neutral Mo has been described in recent studies as having a bond order of six, predicted to be the highest of any homonuclear diatomic, exceeding even that of Cr(five). The photoelectron spectrum of Moconfirms the previously measured vibrational frequency of gas phase Mo and displays transitions to vibrational levels up to v=7 in its ground state. The electron affinity of Mo is measured to be 0.732 0.010 eV. The Mo ground state is assigned as a state, in which the extra electron occupies a formally antibonding orbital of primarily 5 atomic parentage. A Franck-Condon analysis of the vibrational band intensities indicates a change in the equilibrium bond length of only 0.03 0.02 \AA upon electron detachment. These results, and the similar vibrational frequencies measured for Mo and Mo, suggest that the anion HOMO is essentially nonbonding. Weak photodetachment transitions to excited states of Mo lying within 1.2 eV of its ground state are also observed. DFT calculations using the BPW91/SDD method show good agreement with experiment for the electron affinity of Mo and the bond lengths in the anion and neutral molecule ground states. It is hoped that these spectroscopic results will motivate and assist high level theoretical studies of the Mo anion
Different species of FFA concentrations (nmol/g) of 6 mo and 12 mo NEXLPL+/- mice in hippocampus.
No full text<p>m/z: molecular weight of FFA. 6 mo: CTR n = 4, NEXLPL+/- n = 6; 12 mo: CTR n = 3, NEXLPL+/- n = 6.</p><p>Different species of FFA concentrations (nmol/g) of 6 mo and 12 mo NEXLPL+/- mice in hippocampus.</p
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