Biomedical subjects

C Corriol

Publications and source records attributed to C Corriol.

3 recordsLinked to original sources

PubMed2005

Role of elastic scattering in electron dynamics at ordered alkali overlayers on Cu(111).

Scanning tunneling spectroscopy of p(2 x 2) Cs and Na ordered overlayers on Cu(111) reveals similar line widths of quasi-two-dimensional quantum well states despite largely different binding energies. Detailed calculations show that 50% of the line widths are due to electron-phonon scattering while inelastic electron-electron scattering is negligible. The mechanism of enhanced elastic scattering due to Brillouin zone backfolding contributes the remaining width.

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PubMed2005

[Developing quality indicators in hospitals: the COMPAQH project].

BACKGROUND: To select a set of quality indicators (QI) in order to test them in a panel of 36 French hospitals METHODS: The COMPAQH (COordination for Measuring Performance and Assuring Quality in Hospitals) project is coordinated by the French National Institute for Medical Research and supported by the French Ministry of Health and the French National Evaluation and Accreditation Agency. This project has four objectives: (1) to select a set of QI -2003- (2) to implement them in 2004-2005 in a volunteer panel of hospitals (3) to compare the hospitals anonymously (4) to explore quality management implications. QI were selected with a four-step process: (1) Establishment of a list of national priorities for Quality Improvement in relation with the Ministry of Health. (2) setting up a potential list of QI regarding these priorities. The COMPAQH staff determined a preliminary set of 81 QI, based on data in the literature and evidence about the scientific soundness of quality measures and the effectiveness of methods for improving quality. (3) Evaluation of the preliminary list. Each QI was presented in a pamphlet describing its operational definition, rationale, methodology, workload and responsibility of data collection The hospital panel (representatives) ranked the 81 QI with a validated evaluation tool which contained four dimensions: Importance, Scientific acceptability, Feasibility, and Usability. (4) Development of a consensus on a final selection. Based on a structured voting process (Delphi method, two rounds), the hospital panel selected a comprehensive set of 42 QI among the 81. RESULTS: (1) Eight national priorities were defined: pain management, continuity of care, management of nutritional disorders, Iatrogenic risks (including nosocomial infections), patient satisfaction, follow-up of practice guidelines, management of human resources, accessibility. (2) A set of 42 QI were selected: a set of 6 core QI and 7 to 18 specific QI according to the hospital type. CONCLUSION: Such a set of QI provides a foundation for developing a quality measurement system in French hospitals. It requires a pragmatic view for implementing them and a coherence between the different objectives of use (internal and external use).

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PubMed2000

Direct and indirect DIET and DIMET from semiconductor and metal surfaces: what can we learn from 'toy models'?

Desorption induced by electronic transitions (DIET) and its variant DIMET (M = 'Multiple'), are among the simplest possible "reactions" of ad-species involving ultra-short lived electronically excited states at surfaces. The non-adiabatic bond-cleavage can be enforced, for example, with laser irradiation or with electrons or holes emitted from the tip of a scanning tunnelling microscope (STM). The transient creation of excited intermediates can proceed directly (localised to the adsorbate-substrate complex), or indirectly (i.e., through the substrate). To understand the basic processes, simple one-mode two-state "toy models" such as the Menzel-Gomer-Redhead (MGR) or the Antoniewicz scenarios have proven very useful in the past. We adopt and extend MGR- and Antoniewicz-type models together with numerically exact open-system density matrix theory to address a few actual problems/experiments in DI(M)ET: (1) Direct, laser-induced desorption of H(D) from Si(100) surfaces which has been realised in the continuous-wave DIET regime only recently [T. Vondrak and X.-Y. Zhu, Phys. Rev. Lett., 1999, 82, 1967], is studied and compared to so-far hypothetical femtosecond laser desorption. The possibility of controlling the reaction by shaping the laser pulses is addressed. (2) For the same system, temperature effects are studied for electron- or hole-stimulated desorption with an STM [T. C. Shen, C. Wang, G. C. Abeln, T. R. Tucker, J. W. Lyding, Ph. Avouris and R. E. Walkup, Science, 1995, 268, 1590; C. Thirstrup, M. Sakurai, T. Nakayama and K. Stokbro, Surf. Sci., 1999, 424, L329]. A modified version of Gadzuk's "sudden transition and averaging" approach is adopted which accounts for temperature dependent excited state lifetimes. (3) For photodesorption of NO from Pt(111), based on quantum dynamical simulations possible experimental tests involving static electric fields are suggested to address the relevance of the recently challenged [F. M. Zimmermann, Surf. Sci., 1997. 390, 174], "negative ion resonance" model of the Antoniewicz type.

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