7,193 research outputs found

    The Effect on Rudder Control of Slip Stream Body, and Ground Interference

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    This investigation was undertaken to determine the relative effects of those factors which may interfere with the rudder control of an airplane, with especial reference to the process of landing. It shows that ground interference is negligible, but that the effects of a large rounded body and of the slip stream may combine to interfere seriously with rudder control at low flying speeds and when taxiing

    Characterization of high finesse mirrors: loss, phase shifts and mode structure in an optical cavity

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    An extensive characterization of high finesse optical cavities used in cavity QED experiments is described. Different techniques in the measurement of the loss and phase shifts associated with the mirror coatings are discussed and their agreement shown. Issues of cavity field mode structure supported by the dielectric coatings are related to our effort to achieve the strongest possible coupling between an atom and the cavity.Comment: 8 pages, 4 figure

    Electroblotting onto activated glass. High efficiency preparation of proteins from analytical sodium dodecyl sulfate-polyacrylamide gels for direct sequence analysis

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    We have developed a new method for the isolation of proteins for microsequencing. It consists of electrophoretic transfer (electroblotting) of proteins or their cleavage fragments onto activated glass filter paper sheets immediately after separation by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The proteins are immobilized on the glass fiber sheets by ionic interactions or by covalent attachment. A wide range of proteins can be prepared in this fashion with no apparent restriction due to solubility, size, charge, or other intrinsic properties of the proteins. As little as 50 ng of the transferred proteins can be detected using Coomassie Blue or fluorescent dye staining procedures and even smaller amounts of radiolabeled proteins by autoradiography. After detection, the protein- containing bands or spots are cut out and inserted directly into a gas- phase sequenator. The piece of glass fiber sheet acts as a support for the protein during the sequencing. Amounts of protein in the 5- to 150- pmol range can be sequenced, and extended runs can be obtained from the blotted samples because of improved stepwise yields and lower backgrounds. The method has been successfully applied to the sequencing of a variety of proteins and peptides isolated from one-dimensional and two-dimensional polyacrylamide gels

    Letter to the Editor

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    Real-Time Cavity QED with Single Atoms

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    The combination of cold atoms and large coherent coupling enables investigations in a new regime in cavity QED with single-atom trajectories monitored in real time with high signal-to-noise ratio. The underlying “vacuum-Rabi” splitting is clearly reflected in the frequency dependence of atomic transit signals recorded atom by atom, with evidence for mechanical light forces for intracavity photon number <1. The nonlinear optical response of one atom in a cavity is observed to be in accord with the one-atom quantum theory but at variance with semiclassical predictions

    Real-time cavity QED with single atoms

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    We report the first measurement of the real-time evolution of the complex field amplitude brought on by single atom transits. We show the variation in time of both quadrature amplitudes (simultaneously recorded) of the light transmitted through the cavity, as well the resultant optical phase for a single atom transit event. In this particular measurement, the cavity and laser were both detuned by 10 MHz from the Cs resonance

    Conditional evolution in single-atom cavity QED

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    We consider a typical setup of cavity QED consisting of a two-level atom interacting strongly with a single resonant electromagnetic field mode inside a cavity. The cavity is resonantly driven and the output undergoes continuous homodyne measurements. We derive an explicit expression for the state of the system conditional on a discrete photocount record. This expression takes a particularly simple form if the system is initially in the steady state. As a byproduct, we derive a general formula for the steady state that had been conjectured before in the strong driving limit.Comment: 15 pages, 1 postscript figure, added discussion of mode

    What a difficult task it is for music to fulfil the demands of an epic theatre: a discussion of the role of epic music in Bertolt Brecht's plays

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    Music is an essential component of theatre. Music was crucial for the early Greek plays, to the height of Italian opera and up to our current theatre. The writer and director Bertolt Brecht recognized the impact music had in the theatre and incorporated music into his extensive Epic Theatre theories. At the same time though, I have encountered discontinuity between Theatre and Music Studies, as the two rarely overlap. In this thesis I look to ascertain the exact role that music plays within Brecht’s Epic Theatre theories. I will also discuss if Brecht’s theories operate in the same format for all of my case studies and lastly, I will conclude if Brecht’s theories were static or if they developed over time. With this I hope to determine if Brecht’s Epic Music is an achievable theatrical device. To do this, I will first define Epic Theatre and Epic Music. From this I will formulate a structure against which to place the plays The Threepenny Opera, The Rise and Fall of the City of Mahagonny (1930) and The Mother (1932). I will then analyse my three case studies against this structure to determine how the music functions within each play. From this point I aim to determine the exact role that music plays within Brecht’s theories in order to give proper weight and significance to an essential component of Epic Theatre and to determine if Epic Music is a viable theory

    Letter from George H. Hood to James B. Finley

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    Mr. Hood writes on behalf of Mr. Vermillion, a Methodist brother who would like a job as guard at the prison. Hood asks Finley to use his influence to get Vermillion the position. Abstract Number - 1101https://digitalcommons.owu.edu/finley-letters/2085/thumbnail.jp

    Digitalis for treatment of heart failure in patients in sinus rhythm

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    &lt;b&gt;Background&lt;/b&gt;&lt;p&gt;&lt;/p&gt; Digitalis glycosides have been in clinical use for the treatment of heart failure (HF) for longer than 200 years. In recent years, several trials have been conducted to address concerns about their efficacy and toxicity.&lt;p&gt;&lt;/p&gt; &lt;b&gt;Objectives&lt;/b&gt;&lt;p&gt;&lt;/p&gt; To examine the effectiveness of digitalis glycosides in treating HF in patients with normal sinus rhythm. To examine the effects of digitalis in patients taking diuretics and angiotensin-converting enzyme inhibitors; in patients with varying severity and duration of disease; in patients with prior exposure to digitalis versus no prior exposure; and in patients with "HF due to systolic dysfunction" versus "HF with preserved ejection fraction."&lt;p&gt;&lt;/p&gt; &lt;b&gt;Search methods&lt;/b&gt;&lt;p&gt;&lt;/p&gt; Searches on the following databases were updated in May 2013: The Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, EMBASE, and Dissertation Abstracts. Annual meeting abstracts of the American Heart Association, the American College of Cardiology, and the European Society of Cardiology were searched from 1996 to March 2013. In addition, reference lists provided by the pharmaceutical industry (GlaxoSmithKline and Covis Pharma) were searched.&lt;p&gt;&lt;/p&gt; &lt;b&gt;Selection criteria&lt;/b&gt;&lt;p&gt;&lt;/p&gt; Included were randomized placebo-controlled trials of 20 or more adult participants of either sex with symptomatic HF who were studied for seven weeks or longer. Excluded were trials in which the prevalence of atrial fibrillation was 2% or greater, or in which any arrhythmia that might compromise cardiac function or any potentially reversible cause of HF such as acute ischemic heart disease or myocarditis was present.&lt;p&gt;&lt;/p&gt; &lt;b&gt;Data collection and analysis&lt;/b&gt;&lt;p&gt;&lt;/p&gt; Articles selected from the searches described above were evaluated in a joint effort of the review authors. The staff of the Cochrane Heart Group ran searches on the Cochrane Central Register of Controlled Trials, MEDLINE, and EMBASE.&lt;p&gt;&lt;/p&gt; &lt;b&gt;Main results&lt;/b&gt;&lt;p&gt;&lt;/p&gt; No new studies were identified in the updated searches. Thirteen studies (7896 participants) are included, and major endpoints of mortality, hospitalization, and clinical status, based respectively on 8, 4, and 12 of these selected studies, were recorded and analyzed. The data show no evidence of a difference in mortality between treatment and control groups, whereas digitalis therapy is associated with lower rates of both hospitalization and clinical deterioration. The largest study, in which most participants were taking angiotensin-converting enzyme inhibitors, showed a significant rise in “other cardiac” deaths, possibly due to arrhythmias. However collectively, these findings were based on studies done before beta-blockers, as well as angiotensin receptor blockers and aldosterone antagonists, became widely used to treat HF.&lt;p&gt;&lt;/p&gt; &lt;b&gt;Authors' conclusions&lt;/b&gt;&lt;p&gt;&lt;/p&gt; The literature indicates that digitalis may have a useful role in the treatment of patients with HF who are in normal sinus rhythm. New trials are needed to elucidate the importance of the dosage of digitalis and its usefulness in the era of beta-blockers and other agents shown to be effective in treating HF.&lt;p&gt;&lt;/p&gt
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