2,991 research outputs found

    Ultrasonic cleaning: an historical perspective

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    Thomas Davis, The Nation, and Songs of Irish Nationalism

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    Thomas Davis was a significant figure in the flourishing movement of cultural nationalism in mid-nineteenth-century Ireland. A cofounder of _The Nation_, Davis used the journal’s pages as a medium through which to promote a nationalist vision for Ireland distinctive for its nonsectarian appeal. Along with impassioned editorial prose, Davis employed poetry and song to carry his message to the public. “Young Ireland,” as Davis and his colleagues became known, focused their efforts especially on the traditional Irish song, elevating it as a symbol for their cultural heritage while harnessing its emotional power to strengthen their political cause. The songs printed in _The Nation_ quickly became one of the journal’s most popular features, spawning the publication of an 1843 anthology entitled _Spirit of the Nation_. The songbook itself was popular enough to warrant multiple reissues in the years that followed. Davis, as Young Ireland’s chief lyricist, successfully revitalized the tradition of political songwriting. And yet, despite their broad ramifications for Irish culture, several aspects of Davis’s legacy remain unexamined. How did Davis select the melodies for his songs, and how did he fashion new texts for them? To what extent did Davis use music in his nationalist movement? Did he engage with the traditional repertory beyond its mere political expediency? Through a careful analysis of Davis’s lyrics in the context of nationalist politics, an examination of his song tunes in the context of Irish folklore, and a close reading of his notes and correspondence, this dissertation explores Davis’s approach to creating his influential songs and the way in which he employed music in his nationalist campaign. I also identify Davis’s personal engagement with traditional music and assess his role within the larger antiquarian movement in Ireland. Last, by examining Davis’s musical and nationalist influences, I place his Young Ireland movement within a broader European and Irish context. Already well known to scholars of Irish literature and history, Davis emerges from my study a towering figure of Irish music as well

    Measuring and modeling optical diffraction from subwavelength features

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    We describe a technique for studying scattering from subwavelength features. A simple scatterometer was developed to measure the scattering from the single-submicrometer, subwavelength features generated with a focused ion beam system. A model that can describe diffraction from subwavelength features with arbitrary profiles is also presented and shown to agree quite well with the experimental measurements. The model is used to demonstrate ways in which the aspect ratios of subwavelength ridges and trenches can be obtained from scattering data and how ridges can be distinguished from trenches over a wide range of aspect ratios. We show that some earlier results of studies on distinguishing pits from particles do not extend to low-aspect-ratio features

    Ultrasound for improving the preservation of chicken meat

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    <div><p>Abstract The objective of this study was to evaluate the effect of power ultrasound on the microbiota of chicken meat. Samples were treated under the following conditions of frequency and power: 20 kHz and 27.6 W/cm2; 40 kHz and 10.3 W/cm2; 850 kHz and 24.1 W/cm 2. Microbial counts were done before the ultrasound treatment, immediately after and following 7 days of aerobic storage at 4 °C. The results indicate that high intensity ultrasound helps inhibit the growth of lactic acid, mesophilic and psychrophilic bacteria present in chicken meat at the ultrasound frequency levels used in this study. The number of mesophilic bacteria decreased with the ultrasound probe at 20 kHz and 27.6 W/cm2 in relation to the treatment with higher frequency and less intensity. In conclusion, high-intensity ultrasound has a bactericidal effect. Therefore, it can be useful in the preservation of meat products and thus play an important role in the food industry.</p></div

    Transport of Magnetic Polyelectrolyte Capsules in Various Environments

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    Microcapsules consisting of eleven layers of polyelectrolyte and one layer of iron oxide nanoparticles were fabricated. Two types of nanoparticles were inserted as one of the layers within the microcapsule&rsquo;s walls: Fe2O3, ferric oxide, having a mean diameter (&Oslash;) of 50 nm and superparamagnetic Fe3O4 having &Oslash; 15 nm. The microcapsules were suspended in liquid environments at a concentration of 108 caps/mL. The suspensions were pumped through a tube over a permanent magnet, and the accumulation within a minute was more than 90% of the initial concentration. The design of the capsules, the amount of iron embedded in the microcapsule, and the viscosity of the transportation fluid had a rather small influence on the accumulation capacity. Magnetic microcapsules have broad applications from cancer treatment to molecular communication

    Pressure-Assisted Protein Extraction: A Novel Method for Recovering Proteins from Archival Tissue for Proteomic Analysis

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    Formaldehyde-fixed, paraffin-embedded (FFPE) tissue repositories represent a valuable resource for the retrospective study of disease progression and response to therapy. However, the proteomic analysis of FFPE tissues has been hampered by formaldehyde-induced protein modifications, which reduce protein extraction efficiency and may lead to protein misidentification. Here, we demonstrate the use of heat augmented with high hydrostatic pressure (40,000 psi) as a novel method for the recovery of intact proteins from FFPE mouse liver. When FFPE mouse liver was extracted using heat and elevated pressure, there was a 4-fold increase in protein extraction efficiency, a 3-fold increase in the extraction of intact proteins, and up to a 30-fold increase in the number of nonredundant proteins identified by mass spectrometry, compared to matched tissue extracted with heat alone. More importantly, the number of nonredundant proteins identified in the FFPE tissue was nearly identical to that of matched fresh-frozen tissue
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