1,285 research outputs found
Hyperpolarized long-lived states in monodeuterated methyl groups & singlet-scalar relaxation in the regime of slow quadrupolar relaxation
No full textNuclear magnetic resonance (NMR) experiments are time-limited by relaxation dynamics. Observing non-equilibrium magnetization is restricted to timescales governed by the longitudinal relaxation time T1. The use of long-lived states (LLS) offers a promising means to transcend this limitation. LLS are configurations of nuclear spins that are protected against the in pair dipole-dipole relaxation mechanism, with other sources of relaxation significantly attenuated. In systems of spin-1/2 pairs, the LLS is called singlet order and the decay time constant is denoted TS.The field of LLS NMR is now flourishing, LLS lifetimes exceeding T1 by a factor of 50 have been observed, with a lifetime TS > 1 hour observed in room-temperature solution in one case. LLS have even been observed in the 3-spin-1/2 systems of rapidly rotating methyl groups in solution.The work presented in this thesis builds on previous efforts from the LLS community.Most notably, prior attempts at methyl LLS are restricted to just a single case.Through my work, I have extended the family of molecules in which methyl LLS are accessible, achieved with high conversion efficiencies in suitable cases. The use of monodeuterated methyl groups as coherently accessibly reservoirs for nuclear singlet order has lead to the longest observed methyl LLS. The relaxation dynamics of two motionally different cases are examined and geometrical models are presented to explain the experimental results. Hyperpolarization results for these systems are also presented.My work has lead to the investigation of more curious phenomena such as the singlet-scalar relaxation of the second kind (S-SR2K) mechanism. In the regime of slow quadrupolar relaxation, where T1 is significantly slower than the timescale of the nuclear Larmor period, this relaxation mechanism dramatically shortens singlet lifetimes. An experimental demonstration is provided for the case of a 13C labelled, deuterated fumarate derivative. This study differs from previous work on this subject, which examines the limit where the T1 of the third spin is on the timescale of the nuclear Larmor frequency, rarely the case for deuterium nuclei. I provide rate expressions and numerical simulations for the LLS decay in the S-SR2K regime of slow quadrupolar relaxation
Aplicação dos fractais ao mercado de capitais utilizando-se as Elliott Waves
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção.Esta pesquisa apresenta o método Elliott Waves de previsão dos próximos movimentos de preços no mercado financeiro sob o enfoque da teoria do caos e da complexidade, novas áreas da ciência que procuram entender o que a física newtoniana ainda não conseguiu explicar: o comportamento dos sistemas complexos. A possibilidade de conexão entre os mercados de capitais e as teorias do caos e da complexidade foi motivada pela descoberta do comportamento fractal das séries temporais de preços por Benoit Mandelbrot (1997) e pelos registros de repetições quase perfeitas de padrões fractais nos gráficos históricos de ações e mercadorias referentes à bolsa de valores Nova York e à bolsa de mercadorias de Chicago, feitos por Ralph Nelson Elliott e relatados por Robert Prechter (2000) e Glenn Neely (1990). Como alternativa à tradicional Hipótese dos Mercados Eficientes (HME), que está para a Economia assim como a mecânica de Newton está para a Física, a modelagem matemática através dos fractais produz resultados que acompanham as mudanças reais nos preços de uma maneira mais precisa e explicam o comportamento do mercado nos momentos de maior volatilidade. Enquanto os fractais Elliott baseiam-se em dados históricos para se prever acontecimentos futuros, a HME tem como uma de suas premissas a inexistência de memória nos mercados, ou seja, os preços variam aleatoriamente (distribuição de Gauss) e unicamente em função dos novos eventos econômicos, já que os eventos passados já foram totalmente assimilados pelo mercado e descontados nos preços atuais. A HME não corresponde à realidade dos mercados financeiros, o que foi comprovado por esta dissertação
Excavations and survey at Domuztepe, 1996
No full textCarter Elizabeth F., Campbell Stuart, Snead James E. Excavations and survey at Domuztepe, 1996. In: Anatolia Antiqua, Tome 7, 1999. pp. 1-17
Purdue Board of Trustees with President Elliott, 1941
No full textBoard of Trustees; Board of Trustees, January 15, 1941 (left to right) R. B. Stewart, John W. Wheeler, Allison E. Stuart, Dr. Kathryn McHale, F. C. Hockema, Lura Hughel (stenographer), David E. Ross, William A. Hanley, Paul B. Sturm, John Hillenbrand, James W. Noel, President Elliott
F.D.R., his personal letters /
No full textFor contents, see Author Catalog.Includes indexes.Vol. 2 edited by Elliott Roosevelt, assisted by James N. Rosenau; v. 3-4 edited by Elliott Roosevelt, assisted by Joseph P. Lash.For contents, see Author Catalog
Singlet order conversion and parahydrogen-induced hyperpolarization of 13C nuclei in near-equivalent spin systems
No full textWe have demonstrated two radiofrequency pulse methods which convert the nuclear singlet order of proton spin pairs into the magnetisation of nearby 13C nuclei. These irradiation schemes work well in the near-equivalence regime of the three-spin system, which applies when the difference in the two 1H-13C couplings is much smaller than the 1H-1H coupling. We use pulse sequences to generate thermally polarized singlet states in a reproducible manner, and study the singlet-to-magnetisation transfer step. Preliminary results demonstrate a parahydrogen-enhanced 13C polarization level of at least 9%, providing a signal enhancement factor of more than 9000, using 50% enriched parahydrogen
Joint Meeting of the University Trustees and Directors of the Purdue Research Foundation
No full textPhotograph of President Elliott; Joint Meeting of the University Trustees and Directors of the Purdue Research Foundation, October 23, 1943; Front left to right: L.W. Wallace; Louis Ruthenberg; Kathryn McHate; James W. Noel; G. Stanley Meikle; 2nd row: H.C. Blackwell; Allison E. Stuart; Fritz B. Ernst; Charles W. Cole; Paul B. Sturm; 3rd row: F.G. Cottrell; J. Ralph Thompson; Edward C. Elliott
'Pure and undefiled religion': the function of purity language in the Epistle of James
No full textWhereas commentators frequently restrict the categories for purity language in James
to either ritual or metaphorical (and uniformly conclude the language is a metaphor
for personal morality) this is overly restrictive and ignores how purity language was
used in the first-century. Current research of purity language in ancient Israel calls
into question the rigid either/or categorization of purity language in James. Such
descriptions are not only unjustifiably restrictive, but they also fail to account for the
function or meaning of the purity language within the rhetorical goals of the
composition.
The central argument of this investigation is that purity language both articulates and
constructs the composition's worldview and thus serves as an important theme in the
text. Chapter two discusses the different methods of analysis of purity and offers a
taxonomy of purity language. This taxonomy provides a more precise approach to
understanding the function of purity language. Chapter three argues for several
important aspects of the structure and strategy of the text. Specifically the three
interdependent characteristics of 1) an epistolary structure; 2) a coherent rhetorical
argument based on polar oppositions; 3) and the special function of James 1: 2-27 as
an introduction are suggested.
While attuned to the textual issues argued in chapter three, the categories developed in
the taxonomy were applied as a heuristic guide to understand the function of purity
and pollution in chapter four. This analysis demonstrated four specific things: 1)
though purity language occurs relatively infrequently, it is used at crucial points of the
composition (1: 26-27; 3: 6,17; 4: 8); 2) that the use of purity and pollution specifically
functions within the overall strategy of contrasts which leads readers to a decision; 3)
that the majority of the time purity language labeled the world (and by extension those
associated with it) as set against the implicit purity of God; and therefore, 4) the
readers of James must be separate from the impure world ("pure") in order to be
wholehearted in devotion to God ("perfect").
Because the purity of the audience is directly related to their proximity to the world,
chapter five asks what kind of separation is envisioned by the use of purity language.
While purity is indeed boundary language, the cultural stance of James is complex.
The author shows signs of acculturation, yet this acculturation is employed to call the
audience to specific points of separation from surrounding culture, namely separation
from patron-client relationships with the "rich" and use of inappropriate and deceitful
speech. Thus the composition is not calling for sectarian separation from the
surrounding culture, but rather is a complex document demonstrating cultural
accommodation while calling forth specific socio-cultural boundaries between the
readers and the world
Original filing title: Class Photographs, 1908 | Green, Joseph Elliott | Ridgley, Julian White | Williams, Ralph Coplestone | Schwartz, George Henry Charles | Remsen, Ira | Griffin, Edward Herrick | Miller, Daniel | Price, Herbert Bryan | Cohen, Jacob | Armstrong, Alfred Gordon | Bridgeman, Eveleth Wilson | Gorton, William Stuart | Sykes, Philip Louis | Riddle, Lawrence Melville | McCauley, Robert Henry | Mann, Arthur Herman | Sweitzer, Channing Ellsworth | Peck, Peter | Loos, Henry Hofmann | Hecht, Morton Emanuel | Reinhard, Ferdinand Oscar Wolfgang | Hughes, Herman James | Abel, George Hinman | Sellman, Reginald Oliver | Holmes, Frank Glen | Williams, Francis Thomas | Hack, Frank Newcomer | Tilghman, Richard Lloyd | Mathias, Charles McCurdy | Breyer, Frank Gottlob | Brenton, Benjamin Francis Parlett | Wright, Joseph Purdon | Chesney, Alan Mason | Kelly, Caleb Guyer
No full textIndividuals pictured include Joseph Elliott Green, Julian White Ridgley, Ralph Coplestone Williams, George Henry Charles Schwartz, Ira Remsen, Edward Herrick Griffin, Daniel Miller, Herbert Bryan Price, Jacob Cohen, Alfred Gordon Armstrong, Eveleth Wilson Bridgeman, William Stuart Gorton, Philip Louis Sykes, Lawrence Melville Riddle, Robert Henry McCauley, Arthur Herman Mann, Channing Ellsworth Sweitzer, Peter Peck, Henry Hofmann Loos, Morton Emanuel Hecht, Ferdinand Oscar Wolfgang Reinhard, Herman James Hughes, George Hinman Abel, Reginald Oliver Sellman, Frank Glen Holmes, Francis Thomas Williams, Frank Newcomer Hack, Richard Lloyd Tilghman, Charles McCurdy Mathias, Frank Gottlob Breyer, Benjamin Francis Parlett Brenton, Joseph Purdon Wright, Alan Mason Chesney, and Caleb Guyer Kelly
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