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Rutherford backscattering and time-differential perturbed angular correlation experiments were performed on In-implanted nickel foils annealed up to 900 K. The impuritydamage interaction is shown to anneal out just at (or very slightly below) the In diffusion temperature.Work partially supported by CNRS under RCP-157. 相似文献
3.
A. T. T. Tran S. Brossard M. M. Hyland B. J. James P. Munroe 《Plasma Chemistry and Plasma Processing》2009,29(6):475-495
Single NiCr splats were plasma-sprayed onto a polished stainless steel substrate held at room temperature. The splat-substrate
interface was characterized by focused ion beam and transmission electron microscopy. The frequent observation of NiO particles,
particularly in pores within the splat, and at the periphery of splat, suggests that the principal oxidation process occurs
at the substrate surface, where the splats are exposed to a water vapor-rich environment. It was also observed that the splat
adhered well in some locations where elemental-diffusion and jetting of the substrate occurred, suggestive of substrate melting.
A three-dimensional numerical model was developed to simulate the impact of a splat onto a substrate. The simulation shows
that the observation of the central pore in the splat and the phenomenon of substrate melting may occur. Based on these results,
the effect of water release on oxide formation and splat morphology can be explained. 相似文献
4.
François Marin Nizar Abcha Jérôme Brossard Alexander Ezersky 《Comptes Rendus Mecanique》2005,333(3):227-233
Interaction between solitons and a sandy bed in shallow water is investigated. In our experiments, solitons are generated on the background of a harmonic wave, in a wave flume used in resonant mode. It is found that the sand ripples formed by the solitons propagation induce a significant decrease of solitons amplitude and of the phase shift between the soliton and the harmonic wave. However, the amplitude of the harmonic wave is approximately constant. The possible physical processes of such behaviour for the soliton amplitude and for the harmonic wave amplitude are discussed. To cite this article: F. Marin et al., C. R. Mecanique 333 (2005). 相似文献
5.
Ashley A. Anderson Dominique Brossard Dietram A. Scheufele 《Journal of nanoparticle research》2010,12(4):1083-1094
The shift toward online communication in all realms, from print newspapers to broadcast television, has implications for how
the general public consumes information about nanotechnology. The goal of this study is threefold: to investigate who is using
online sources for information and news about science and nanotechnology, to examine what the general public is searching
for online with regards to nanotechnology, and to analyze what they find in online content of nanotechnology. Using survey
data, we find those who report the Internet as their primary source of science and technology news are diverse in age, more
knowledgeable about science and nanotechnology, highly educated, male, and more diverse racially than users of other media.
In a comparison of demographic data on actual visits by online users to general news and science Web sites, science sites
attracted more male, non-white users from the Western region of the United States than news sites did. News sites, on the
other hand, attracted those with a slightly higher level of education. Our analysis of published estimates of keyword searches
on nanotechnology reveals people are turning to the Internet to search for keyword searches related to the future, health,
and applications of nanotechnology. A content analysis of online content reveals health content dominates overall. Comparisons
of content in different types of sites—blogs, government, and general sites—are conducted. 相似文献
6.
Characteristics of dextrin adsorption by elemental sulfur were investigated by the means of diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, total organic carbon (TOC) measurements, BET measurements as well as molecular dynamics simulation (MDS). Adsorption isotherms for dextrin adsorption by sulfur were compared to isotherms for dextrin adsorption by other hydrophilic and hydrophobic surfaces taken from the literature. The three-dimensional structure of dextrin was studied in detail and possible mechanisms of adsorption are discussed. Additionally, molecular dynamics simulations provided further insight into the mechanism of dextrin adsorption by elemental sulfur. 相似文献
7.
F. Villa M. Grivet M. Rebetez C. Dubois A. Chambaudet A. Chevarier P. Martin F. Brossard G. Blondiaux T. Sauvage M. Toulemonde 《Radiation measurements》1999,31(1-6):65-70
With the aim of characterizing damage along nuclear tracks in apatite, Durango fluoroapatite monocrystals were irradiated under a high fluence 86Kr ion beam at the G.A.N.I.L. (Grand Accélérateur National d'Ions Lourds, Caen, France). The resulting irradiation damage was studied by associating CRBS spectrometry and chemical etching. By applying Poisson's law to the backscattering results, the nuclear track average effective radius Re was calculated for different steps along the ion path. On the other hand, the chemical etching experiments allowed us to deduce three different damaging morphologies in correspondence to the Re values. For the first time in apatite, it has been shown that a defect fragmentation produced along the ion paths may be detected by chemical etching. These results were also applied to fission tracks in order to quantify the damage rate and to describe the damage morphology evolution along fission fragment paths. 相似文献
8.
Bouvet D Michalowicz A Crauste-Manciet S Brossard D Provost K 《Inorganic chemistry》2006,45(8):3393-3398
Platinum compounds constitute a discrete class of DNA-damaging anticancer drug agents, including cisplatin, carboplatin, and oxaliplatin. The toxicity of such drugs raises the problem of waste detoxification. Diethyl dithiocarbamate (DDTC) is recommended by the World Heath Organization (WHO) for the destruction of cisplatin, but the degradation product has not been structurally characterized. This paper deals with the extended X-ray absorption fine structure (EXAFS) and IR structural study of the reaction products of DDTC with cisplatin, carboplatin, and oxaliplatin. Cisplatin and carboplatin give the same reaction product: Pt(DDTC)2. In the case of oxaliplatin, we observed the formation of [(diaminocyclohexane)(DDTC)Pt(II)]. In all cases, the replacement of labile ligands by strong ligands should lead to inactive compounds. Our results suggest that the WHO inactivation protocol might be extended to carboplatin and oxaliplatin. Nevertheless, this should be validated by toxicity tests of the degradation products. 相似文献
9.
McLain Derek R. Brossard Tom W. Tsai Yifen Condon Nicholas J. Canaday Jodi L. 《Journal of Radioanalytical and Nuclear Chemistry》2022,331(5):2169-2174
Journal of Radioanalytical and Nuclear Chemistry - Two methods were used to evaluate the age of 75Se sealed source material. Both methods utilized gamma spectroscopy to determine the quantity of... 相似文献
10.
Przemyslaw Los Andrzej Lasia Hugues Mnard Louis Brossard 《Journal of Electroanalytical Chemistry》1993,360(1-2)
The hydrogen evolution reaction (HER) was investigated on a lanthanum-phosphate-bonded nickel (LPBN) powder electrode in 30 wt.% NaOH at 70°C using ac impedance and steady-state polarization techniques. Circuits containing one or two constant-phase elements (CPEs) in parallel with a resistance and corresponding to fractal and porous electrode models were tested in order to interpret the ac impedance data. The experimental impedance spectra were well described by the porous electrode model and the circuit containing two CPEs. The results obtained from the ac impedance and steady-state measurements allowed the mechanism and kinetics of the HER to be evaluated. Comparison of these parameters with those obtained on the polycrystalline nickel electrode in 1 M alkaline solution at 25°C indicates that an increase in activity is principally due to an increase in the real surface area. 相似文献