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RISS 인기검색어
- 검색키워드
- 저자 : Chauveau, C. (검색결과 3 건)
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Growth and Characterization of Non-Polar (Zn,Mg)O/ZnO Quantum Wells and Multiple Quantum Wells
J.-M. Chauveau,B. Vinter,M. Laugt,M. Teisseire,P. Vennegues,C. Deparis,J. Zuniga-Perez,C. Morhain 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Zinc Oxide (ZnO) has recently attracted considerable attention because of its potential applications in the blue and the UV spectral range. To now, (Zn,Mg)O/ZnO heterostructures have been grown in a c-orientation. The growth of non-polar layers along the a direction [1120] has been proposed to avoid any built-in electric fields in the c-direction. A series of A-plane (1120) ZnO quantum wells (QWs) and multiple QWs embedded in (Zn,Mg)O barriers were grown. After the structural and the optical characterizations of the (Zn,Mg)O buffer layers, we compared the PL emission of a-oriented and c-oriented QWs and MQWs. We demonstrated that the a-oriented quantum wells exhibited confinement, but no indication of the quantum confined Stark effect was observed, in contrast with c-oriented heterostructures. Zinc Oxide (ZnO) has recently attracted considerable attention because of its potential applications in the blue and the UV spectral range. To now, (Zn,Mg)O/ZnO heterostructures have been grown in a c-orientation. The growth of non-polar layers along the a direction [1120] has been proposed to avoid any built-in electric fields in the c-direction. A series of A-plane (1120) ZnO quantum wells (QWs) and multiple QWs embedded in (Zn,Mg)O barriers were grown. After the structural and the optical characterizations of the (Zn,Mg)O buffer layers, we compared the PL emission of a-oriented and c-oriented QWs and MQWs. We demonstrated that the a-oriented quantum wells exhibited confinement, but no indication of the quantum confined Stark effect was observed, in contrast with c-oriented heterostructures.
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On the effective Lewis number formulations for lean hydrogen/hydrocarbon/air mixtures
Bouvet, N.,Halter, F.,Chauveau, C.,Yoon, Y. Pergamon Press ; Elsevier Science Ltd 2013 International journal of hydrogen energy Vol.38 No.14
Decades of research have underlined the undeniable importance of the Lewis number (Le) in the premixed combustion field. From early experimental observations on laminar flame propagation to the most recent DNS studies of turbulent flames, the unbalanced influence of thermal to mass diffusion (i.e. Le ≠ 1), known as nonequidiffusion, has shed the light on a wide range of combustion phenomena, especially those involving stretched flames. As a result the determination of the Lewis number has become a routine task for the combustion community. Recently, the growing interest in hydrogen/hydrocarbon (HC) fuel blends has produced extensive studies that have not only improved our understanding of H<SUB>2</SUB>/HC flame dynamics, but also, in its wake, raised a fundamental question: which effective Lewis number formulation should we use to characterize the combustion of hydrogen/hydrocarbon/air blends? While the Lewis number is unambiguously defined for combustible mixtures with a single fuel reactant, the literature is unclear regarding the appropriate equivalent formulation for bi-component fuels. The present paper intends to clarify this aspect. To do so, effective Lewis number formulations for lean (φ = 0.6 and 0.8) premixed hydrogen/hydrocarbon/air mixtures have been investigated in the framework of an existing outwardly propagating flame theory. Laminar burning velocities and burned Markstein lengths of H<SUB>2</SUB>/CH<SUB>4</SUB>, H<SUB>2</SUB>/C<SUB>3</SUB>H<SUB>8</SUB>, H<SUB>2</SUB>/C<SUB>8</SUB>H<SUB>18</SUB> and H<SUB>2</SUB>/CO fuel blends in air were experimentally and numerically determined for a wide range of fuel compositions (0/100% → 100/0% H<SUB>2</SUB>/HC). By confronting the two sets of results, the most appropriate effective Lewis number formulation was identified for conventional H<SUB>2</SUB>/HC/air blends. Observed deviations from the validated formulation are discussed for the syngas (H<SUB>2</SUB>/CO) flame cases.
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C.D.R. Azevedo,A. Baeza,E. Chauveau,J.A. Corbacho,J. Diaz,J. Domange,C. Marquet,M. Martinez-Roig,F. Piquemal,C. Roldan,J. Vasco,J.F.C.A. Veloso,N. Yahlali Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
In the TRITIUM project, an on-site monitoring system is being developed to measure tritium (<sup>3</sup>H) levels in water near nuclear power plants. The quite low-energy betas emitted by <sup>3</sup>H have a very short average path in water (5 ㎛ as shown by simulations for 18 keV electrons). This path would be further reduced by impurities present in the water, resulting in a significant reduction of the detection efficiency. Therefore, one of the essential requirements of the project is the elimination of these impurities through a filtration process and the removal of salts in solution. This paper describes a water treatment system developed for the project that meets the following requirements: the water produced should be of near-pure water quality according to ISO 3696 grade 3 standard (conductivity < 10 µS/cm); the system should operate autonomously and be remotely monitored.
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