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François Treussart Nicolas Dubreuil Jongthan Cave Knight Vahid Sandoghdar Jean Hare Valçrie Lefçvre-Seguin Jean-Michel Raimond Serge Haroche 《电信纪事》1997,52(11-12):557-568
Light can be confined efficiently in the high-Q, small-volume whispering-gallery-modes observed in silica microspheres. By coupling these microspheres to eroded optical fibers and fiber tips, direct mapping of the whispering-gallery modes has been achieved and the mode numbers have been assessed. The properties of these modes have allowed us to obtain laser action with very low thresholds in Nd-doped silica microspheres. Further projects in the field of non-linear optics and cavity quantum electrodynamics are described. 相似文献
3.
Aiman Q. Jaradat Stefan J. Grimberg Thomas M. Holsen 《Canadian Metallurgical Quarterly》2009,135(7):544-550
In this project the use of natural media filtration (NMF) was evaluated for its ability to remove colloidal particles from the aqueous phase as a function of ionic strength and filter media type by determining first-order kinetic deposition rate coefficients. Mushroom compost (MC) and leaf compost (LC) were tested as natural filter media and the results were compared to those obtained using sand and granular activated carbon (GAC). The highest deposition rate coefficients were observed for GAC, followed by LC and MC, and the lowest deposition rate coefficients were found for sand. As predicted by the Derjaguin–Landau–Verwey–Overbeek theory, higher deposition rates were obtained at higher solution ionic strengths. Overall the experiments suggest that the NMF process can efficiently remove colloidal particles from surface waters. 相似文献
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This article describes how Semantic Web technologies can be used to interlink musical data sources that have traditionally been isolated and difficult to integrate. 相似文献
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Raja Jelassi Hajer Khemaissia Anas Ayari Dhouha Bohli-Abderrazek Chedliya Ghemari Maryline Raimond Catherine Souty-Grosset Karima Nasri-Ammar 《Microscopy research and technique》2022,85(5):1713-1722
Effects of trace elements on the hepatopancreas ultrastructure and on the locomotor activity rhythm were investigated in the amphipod talitrid Orchestia gammarellus collected from Bizerte lagoon banks situated in the north of Tunisia. Animals were exposed to a series of contaminated soil with different concentrations of cadmium and zinc. The locomotor activity rhythm was studied under constant darkness. Histopathological analysis showed that the trace elements, especially the Cd, induced significant changes in the morphology and in the ultrastructural organization of hepatopancreatic cells. The significant alterations obtained were dose dependent. Concerning the behavioral response, results revealed the presence of two components whatever the experimental conditions. In addition, a great inter-individual variability of the locomotor rhythm was observed. Patterns were in majority bimodal for the control individuals and became unimodal and multimodal when exposed under Cd and Zn, respectively. Furthermore, ultradian and circadian periods were determined. The circadian period lengthened after Zn exposure. In addition, the locomotor activity rhythm was more stable for control individuals. However, those exposed to Cd were less active. 相似文献
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Summary Rigid rod polymers containing long rigid side chains have been prepared. The initial approach to this class of materials involved the synthesis of a poly (p-phenyleneterephthalamide) (PPT) backbone with diphenylthiazolothiazole pendant groups. The synthesis and preliminary characterization of the monomer and polymer are reported. 相似文献
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R Said G Volpin B Grimberg SR Friedenstrom E Lefler S Stahl 《Canadian Metallurgical Quarterly》1998,23(6):808-810
We report 49 patients with a wide variety of hand infections, which developed after injuries from St Peter's fish (Tilapia zillii). Twenty-eight of 36 patients who had been operated on had non-cholera Vibrio infections, all identified as Vibrio vulnificus. The course in these patients was characterized by rapid spread of the infection with progressive necrosis of the tendon sheath, subcutaneous tissues and the skin. Two of them required amputations but the others had satisfactory functional results. Thirteen other patients were managed nonoperatively with intravenous antibiotics and all of them recovered completely. 相似文献
9.
Hajer Khemaissia Raja Jelassi Chedliya Ghemari Maryline Raimond Catherine Souty‐Grosset Karima Nasri‐Ammar 《Microscopy research and technique》2019,82(12):2014-2025
To estimate trace element bioaccumulation in Armadillo officinalis, specimens were collected from Ghar El Melh lagoon then exposed for 3 weeks in contaminated sediments with copper, zinc, and cadmium. From the first week until the end of the experiment, a decrease in A. officinalis growth related to the increase of Cd concentration in the sediment was recorded. However, a mass gain was highlighted under Cu and Zn exposures. At the end of experiment, body metal concentrations were measured using flame atomic emission spectrometry. Results of the bioaccumulation factor showed that the species could be considered as a macroconcentrator of copper (BAF > 2) and a deconcentrator of zinc (BAF < 2). Microscopy observations of hepatopancreas cells showed morphological and histological changes even at the lowest concentration. They consisted in the microvillus border destruction, lipid droplets modifications, trace element accumulation, and the condensation of the majority of cellular organelles. The degree of these alterations was found to be dose‐dependent. Through these results, the isopod A. officinalis could be used as relevant monitor organisms for soil metal contamination. 相似文献
10.
Defocus estimation is an important step for improving the resolution of single particle reconstructions. It can be troublesome to estimate the defocus from low-dose cryo-electron microscopy (cryo-EM) data, particularly if there is not sufficient contrast present in the Fourier transform of the micrograph. Most existing approaches estimate the defocus from the presence of Thon rings within the power spectrum, employing image enhancement techniques to highlight these rings. In this paper, an approach to estimating the defocus from a stroboscopic image series is described. The image series is used to obtain two statistical metrics: figure of merit (FOM) and Q-factor. These metrics have been used to estimate the defoci from low-dose stroboscopic cryo-EM data consisting of a variable number of images. 相似文献