426 research outputs found

    A Poem

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    Laughter For Henri

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    The Feast of the Red Falling Leaves

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    Building the Pyre

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    The Song of Cuba’s Great Awakening: Music in Baptist Worship and Witness

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    From the 1990s to the present, Cuban Baptists have witnessed a time of unparalleled church growth. During that time frame, musicians have participated in ministries aimed at church growth by organizing largescale public musical events, compiling a Cuban hymnal that included indigenous cubano worship songs, developing new programs of leadership training for church musicians, and employing music in missionary projects both at home and abroad. This article explores what can be learned from the Cuban Baptists’ experience regarding music as an effective tool in evangelism, the value of musicians reaching musicians as a mission strategy, the importance of ethnodoxology in worship expression, and the interconnection of worship and witness

    The Song of Cuba’s Great Awakening: Music in Baptist Worship and Witness

    Get PDF
    From the 1990s to the present, Cuban Baptists have witnessed a time of unparalleled church growth. During that time frame, musicians have participated in ministries aimed at church growth by organizing largescale public musical events, compiling a Cuban hymnal that included indigenous cubano worship songs, developing new programs of leadership training for church musicians, and employing music in missionary projects both at home and abroad. This article explores what can be learned from the Cuban Baptists’ experience regarding music as an effective tool in evangelism, the value of musicians reaching musicians as a mission strategy, the importance of ethnodoxology in worship expression, and the interconnection of worship and witness

    Prediction Properties of Aitken's Iterated Delta^2 Process, of Wynn's Epsilon Algorithm, and of Brezinski's Iterated Theta Algorithm

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    The prediction properties of Aitken's iterated Delta^2 process, Wynn's epsilon algorithm, and Brezinski's iterated theta algorithm for (formal) power series are analyzed. As a first step, the defining recursive schemes of these transformations are suitably rearranged in order to permit the derivation of accuracy-through-order relationships. On the basis of these relationships, the rational approximants can be rewritten as a partial sum plus an appropriate transformation term. A Taylor expansion of such a transformation term, which is a rational function and which can be computed recursively, produces the predictions for those coefficients of the (formal) power series which were not used for the computation of the corresponding rational approximant.Comment: 34 pages, LaTe

    A valley-spin qubit in a carbon nanotube

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    Although electron spins in III-V semiconductor quantum dots have shown great promise as qubits, a major challenge is the unavoidable hyperfine decoherence in these materials. In group IV semiconductors, the dominant nuclear species are spinless, allowing for qubit coherence times that have been extended up to seconds in diamond and silicon. Carbon nanotubes are a particularly attractive host material, because the spin-orbit interaction with the valley degree of freedom allows for electrical manipulation of the qubit. In this work, we realise such a qubit in a nanotube double quantum dot. The qubit is encoded in two valley-spin states, with coherent manipulation via electrically driven spin resonance (EDSR) mediated by a bend in the nanotube. Readout is performed by measuring the current in Pauli blockade. Arbitrary qubit rotations are demonstrated, and the coherence time is measured via Hahn echo. Although the measured decoherence time is only 65 ns in our current device, this work offers the possibility of creating a qubit for which hyperfine interaction can be virtually eliminated

    Tunable few-electron double quantum dots and Klein tunnelling in ultra-clean carbon nanotubes

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    Quantum dots defined in carbon nanotubes are a platform for both basic scientific studies and research into new device applications. In particular, they have unique properties that make them attractive for studying the coherent properties of single electron spins. To perform such experiments it is necessary to confine a single electron in a quantum dot with highly tunable barriers, but disorder has until now prevented tunable nanotube-based quantum-dot devices from reaching the single-electron regime. Here, we use local gate voltages applied to an ultra-clean suspended nanotube to confine a single electron in both a single quantum dot and, for the first time, in a tunable double quantum dot. This tunability is limited by a novel type of tunnelling that is analogous to that in the Klein paradox of relativistic quantum mechanics.Comment: 21 pages including supplementary informatio

    Energy Metabolism in the Failing Right Ventricle: Limitations of Oxygen Delivery and the Creatine Kinase System

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    Pulmonary arterial hypertension (PAH) results in hypertrophic remodeling of the right ventricle (RV) to overcome increased pulmonary pressure. This increases the O₂ consumption of the myocardium, and without a concomitant increase in energy generation, a mismatch with demand may occur. Eventually, RV function can no longer be sustained, and RV failure occurs. Beta-adrenergic blockers (BB) are thought to improve survival in left heart failure, in part by reducing energy expenditure and hypertrophy, however they are not currently a therapy for PAH. The monocrotaline (MCT) rat model of PAH was used to investigate the consequence of RV failure on myocardial oxygenation and mitochondrial function. A second group of MCT rats was treated daily with the beta-1 blocker metoprolol (MCT + BB). Histology confirmed reduced capillary density and increased capillary supply area without indications of capillary rarefaction in MCT rats. A computer model of O₂ flux was applied to the experimentally recorded capillary locations and predicted a reduction in mean tissue Po₂ in MCT rats. The fraction of hypoxic tissue (defined as Po₂ < 0.5 mmHg) was reduced following beta-1 blocker (BB) treatment. The functionality of the creatine kinase (CK) energy shuttle was measured in permeabilized RV myocytes by sequential ADP titrations in the presence and absence of creatine. Creatine significantly decreased the KmADP in cells from saline-injected control (CON) rats, but not MCT rats. The difference in KmADP with or without creatine was not different in MCT + BB cells compared to CON or MCT cells. Improved myocardial energetics could contribute to improved survival of PAH with chronic BB treatment
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