Direct Observation of Propagating Gigahertz Coherent Guided Acoustic Phonons in Free Standing Single Copper Nanowires

We report on gigahertz acoustic phonon waveguiding in free-standing single copper nanowires studied by femtosecond transient reflectivity measurements. The results are discussed on the basis of the semianalytical resolution of the Pochhammer and Chree equation. The spreading of the generated Gaussian wave packet of two different modes is derived analytically and compared with the observed oscillations of the sample reflectivity. These experiments provide a unique way to independently obtain geometrical and material characterization. This direct observation of coherent guided acoustic phonons in a single nano-object is also the first step toward nanolateral size acoustic transducer and comprehensive studies of the thermal properties of nanowires

Gothic Revival Architecture Before Horace Walpole's Strawberry Hill

The Gothic Revival is generally considered to have begun in eighteenth-century Britain with the construction of Horace Walpole’s villa, Strawberry Hill, Twickenham, in the late 1740s. As this chapter demonstrates, however, Strawberry Hill is in no way the first building, domestic or otherwise, to have recreated, even superficially, some aspect of the form and ornamental style of medieval architecture. Earlier architects who, albeit often combining it with Classicism, worked in the Gothic style include Sir Christopher Wren, Nicholas Hawksmoor, William Kent and Batty Langley, aspects of whose works are explored here. While not an exhaustive survey of pre-1750 Gothic Revival design, the examples considered in this chapter reveal how seventeenth- and eighteenth-century Gothic emerged and evolved over the course of different architects’ careers, and how, by the time that Walpole came to create his own Gothic ‘castle’, there was already in existence in Britain a sustained Gothic Revivalist tradition

Réalisation d'un dispositif d'acoustique picoseconde à haute résolution latérale (application à l'étude des propriétés vibrationnelles de micro-et nano-structures)

PARIS-BIUSJ-Thèses (751052125) / SudocPARIS-BIUSJ-Physique recherche (751052113) / SudocSudocFranceF

J. D. T. von Bienville, der Arztneygelahrheit Doctor, Medicinische Abhandlungen über die Fehler des Menschen in Absicht auf die Gesundheit.

Paginierfehler ab S. 201Autopsie nach Ex. der ULB Sachsen-AnhaltVorlageform des Erscheinungsvermerks: Im Haag, 1777

The Audubon Aquarium of the Americas

The Audubon Aquarium of the Americas, part of the Audubon Nature Institute, was founded by a joint venture called the Bienville Group, a group of five New Orleans architectural firms. Construction was completed in 1990: 110,000 square feet with three stories, and built of concrete with glazed ceramic brick. The aquarium\u27s design is based around the habitats within it, with ample room for rotational viewings of the animals. The Audubon Aquarium\u27s construction was a significant cultural development for New Orleans and introduced new tourism to the cityhttps://digitalcommons.ric.edu/smolski_images/2098/thumbnail.jp

Photothermal experiments in the time and frequency domains using an optical near field microscope

We report on modulated time resolved photothermal measurements with a time resolution of 0.3 ps and a lateral resolution around 100 nm. A near field optical microscope operating in reflection geometry and coupled with a standard pump–probe set-up is described. Results obtained on thin aluminum and tungsten films are first discussed. It is shown that the sensitivity of our system allows the observation of thermal features: varying the modulation frequency of the pump beam, photothermal imaging can be carried out up to a few megahertz; scanning the time delay line, thermal images at different times can also be recorded. Then, results obtained on patterned structures made of submicrometric metallic stripes with a lateral size going as low as 250 nm are also reported