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41.
Zaïr A Holler M Guandalini A Schapper F Biegert J Gallmann L Keller U Wyatt AS Monmayrant A Walmsley IA Cormier E Auguste T Caumes JP Salières P 《Physical review letters》2008,100(14):143902
We have investigated the intensity dependence of high-order harmonic generation in argon when the two shortest quantum paths contribute to the harmonic emission. For the first time to our knowledge, experimental conditions were found to clearly observe interference between these two quantum paths that are in excellent agreement with theoretical predictions. This result is a first step towards the direct experimental characterization of the full single-atom dipole moment and demonstrates an unprecedented accuracy of quantum path control on an attosecond time scale. 相似文献
42.
We have investigated a series of glasses and melts along the GeO2-SiO2 join using insitu Raman spectroscopy. The results for both the glasses and melts are consistent with a continuous random network in which there are ‘regions’ that are SiO2-like, GeO2-like and mixed GeO2-SiO2-like. Incorporation of GeO2 into the SiO2 network is initially accommodated via the 3- and 4-membered SiO4 rings which are lost as they convert to larger mixed Ge/Si rings. The LO-TO mode behavior is also consistent with a network that is composed of different ‘regions’ and is similar to that expected from the Bruggeman effective media model. At the highest temperatures there are indications that the mixed Ge/Si rings convert back to small 3-membered GeO4 rings and large SiO4 rings; the small 3- and 4-membered SiO4 rings are not reformed. 相似文献
43.
Georges Lucotte Laurent Cormier Bruno Delfort 《Journal of polymer science. Part A, Polymer chemistry》1991,29(6):897-903
Ethynyl-terminated polysulfones and ethynyl-terminated polyether-ketones were prepared in a one-step polyetherification reaction using new end-capping agents, respectively 4-ethynyl-3′-nitrodiphenylsulfone and 4-ethynyl-4′-nitrobenzophenone. These reagents were prepared according to a three-step route each. End-capping of the polymers involve the nitro displacement by a phenoxide ion. The nitro group was found to be more reactive than the fluoro one as a leaving group. Due to the thermally induced reaction of their ethynyl end-groups, the polymers lead to materials with improved glass transition temperatures and good thermostability. 相似文献
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45.
SPECTROPHOTOMETRIC IDENTITY OF THE ENERGY TRANSFER CHROMOPHORES IN RENILLA AND AEQUOREA GREEN-FLUORESCENT PROTEINS 总被引:1,自引:0,他引:1
William W. Ward Chris W. Cody Russell C. Hart Milton J. Cormier 《Photochemistry and photobiology》1980,31(6):611-615
Abstract— Spectral properties of guanidine-denaturated and pronase-digested green-fluorescent proteins (GFP) from two species of bioluminescent coelenterates have been investigated. Spectrophotometric titrations of Renilla and Aequorea GFP, following denaturation in 6 M guanidine HCl at elevated temperature, revealed identical absorption peaks in acid (383–384 nm) and in alkali (447–448 nm) and a single isosbestic point in the visible region at 405 nm. Both proteins exhibited a spectrophotometric pK. of 8.1 in guanidine -HCl. Pronase digestion of the heat-denaturated GFP's generated a methanol-soluble blue-fluorescent peptide with identical fluorescence emission spectra (λmax = 430 nm, uncorrected; φf1 = 0.003) for both coelenterate species. These data suggest that the large absorption differences between native Renilla and Aequorea GFP molecules result from unique protein environments imported to a common chromophore. 相似文献
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48.
The decomposition of propane diluted in air has been investigated using a pulsed high-voltage dielectric barrier discharges
reactor. Effects of the temperature (from 300 to 800 K) and humidity in air on propane conversion and on produced species
are studied. CO and CO2 are the two main carbon species produced but other carbon species can be also obtained as functions of electrical parameters
or temperature. Total decomposition of inlet propane to CO2 is possible when propane is diluted in wet air from 600 K. Thermal energy is an important parameter to limit the energy density
injected in the plasma reactor and to reduce the total energetic cost keeping a high propane decomposition yield. 相似文献
49.
Propane steam reforming using a sliding discharge reactor was investigated under atmospheric pressure and low temperature
(420 K). Non-thermal plasma steam reforming proceeded efficiently and hydrogen was formed as a main product (H2 concentration up to 50%). By-products (C2-hydrocarbons, methane, carbon dioxide) were measured with concentrations lower than 6%. The mean electrical power injected
in the discharge is less than 2 kW. The process efficiency is described in terms of propane conversion rate, steam reforming
and cracking selectivity, as well as by-products production. Chemical processes modelling based on classical thermodynamic
equilibrium reactor is also proposed. Calculated data fit quiet well experimental results and indicate that the improvement
of C3H8 conversion and then H2 production can be achieved by increasing the gas fraction through the discharge. By improving the reactor design, the non-thermal
plasma has a potential for being an effective way for supplying hydrogen or synthesis gas. 相似文献
50.
Papadopoulos DN Zaouter Y Hanna M Druon F Mottay E Cormier E Georges P 《Optics letters》2007,32(17):2520-2522
We report the generation of 63 fs pulses of 290 nJ energy and 4.1 MW peak power at 1050 nm based on the use of a polarization-maintaining ytterbium-doped fiber parabolic amplification system. We demonstrate that operation of the amplifier beyond the gain bandwidth limit plays a key role on the sufficient recompressibility of the pulses in a standard grating pair compressor. This results from the accumulated asymmetric nonlinear spectral phase and the good overall third-order dispersion compensation in the system. 相似文献