172,583 research outputs found
New insights on the interfacial tension of electrochemical interfaces and the Lippmann equation
No full textThe Lippmann equation is considered as universal relationship between interfacial tension, double layer charge, and cell potential. Based on the framework of continuum thermo-electrodynamics, we provide some crucial new insights to this relation. For general interfaces such that the local curvature radius is large compared to the Debye length, we apply asymptotic analysis methods to obtain the Lippmann equation. We give precise definitions of the involved quantities and show that the interfacial tension of the Lippmann equation is composed of the surface tension of our general model, and contributions arising from the adjacent space charge layers that can only lower the interfacial tension. Moreover, it turns out that surface reactions can be consistently incorporated into the Lippmann equation, provided that there is no charge transfer from one side of the interface to the other. We apply the model to curved liquid metal electrodes and compare our model to experimental data of several mercury–electrolyte interfaces. We obtain qualitative and quantitative agreement in the 2 V potential range for various salt concentrations.</jats:p
Landsberg (H. E.), Lippmann (H.), Paffen (K. H.) und Troll (C). — Weltkarten zur Klimakunde.
No full textLoup Jean. Landsberg (H. E.), Lippmann (H.), Paffen (K. H.) und Troll (C). — Weltkarten zur Klimakunde.. In: Revue de géographie alpine, tome 54, n°1, 1966. p. 190
Libertad en condiciones. A vueltas con Dewey y Lippmann
No full textWe propose a reconsideration of John Dewey’s criticisms of Walter Lippmann’s ideas taking as guiding theme the arguments put forward in the successive reviews that Dewey wrote on Lippmann’s works. We maintain that the ideas that Dewey launched in these reviews (as well as in The Public and its Problems, 1927) pointed in a direction that became more explicit in the 1930s, when Dewey responded with socialist discourse to a Lippmann who appealed to something more that the authority of trained experts to counteract the drifts of democracy. According to our view, the debate they held not only revealed two visions of the relationship between democracy and popular will, but also two discrepant conceptions about the economic bases of an open society and the necessary conditions for freedom exercise.El presente ensayo reconsidera las críticas de John Dewey a Walter Lippmann tomando como eje los argumentos esgrimidos en las sucesivas reseñas que Dewey fue haciendo de las obras de Lippmann. Se sostiene que las críticas que Dewey lanzó en estas reseñas, así como luego en The Public and its Problems (1927) ya apuntaban en una dirección que quedó más explícita en los años treinta, cuando Dewey respondió con lenguaje socialista a un Lippmann que apelaba a algo más que a la autoridad de expertos para contrarrestar las derivas de la democracia. En el debate que mantuvieron, no solo se pusieron en juego dos visiones de la relación entre democracia y voluntad popular, sino dos concepciones discrepantes sobre las bases económicas de una sociedad abierta y las condiciones necesarias para el ejercicio de la libertad
Wavelength-multiplexed memory based on a Lippmann architecture
No full textInternational audiencePresentation of a new optical data storage architecture based on Lippmann interference photography : first experimental results
Uniqueness of the N-body Lippmann-Schwinger-Glöckle-Tobocman equations
No full textIt is proved that the 2N-1-1 Lippmann-Schwinger-Glöckle-Tobocman equations provide a unique solution to the N-body scattering problem and that they represent the minimum number of Lippman-Schwinger-type equations necessary and sufficient to ensure uniqueness
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Analisi e soluzione numerica dell'equazione di Lippmann-Schwinger
No full textIn questa tesi è illustrato un procedimento numerico per risolvere l'equazione di Lippmann-Schwinger. Tale procedimento è applicato nella scrittura di un codice in C++, che risolve l'equazione noto il potenziale di interazione tra nucleoni.
Il potenziale utilizzato nella scrittura del codice è il potenziale di Entem-Machleidt-Nosyk (ENM-N^4LO). A partire dalla soluzione dell'equazione di Lippmann-Schwinger, sono calcolati gli sfasamenti per diversi valori del momento angolare totale (J = 1,...,8) e diverse tipologie di collisione tra nucleoni (neutrone-protone e protone-protone), per canali singoli ed accoppiati. I valori ottenuti sono infine confrontati con i dati sperimentali ed è eseguita una breve analisi numerica per verificare la convergenza del risultato
Coudounèu (Lançon-de-Provence, Bouches-du-Rhône) : une ferme-grenier et son terroir au Ve s. av. J.-C. - Documents CD-ROM
No full textVerdin Florence, Chabal Lucie, Marinval Philippe, Lippmann-Provansal Mireille, Brien-Poitevin Françoise. Coudounèu (Lançon-de-Provence, Bouches-du-Rhône) : une ferme-grenier et son terroir au Ve s. av. J.-C. - Documents CD-ROM. In: Documents d'Archéologie Méridionale, vol. 19-20, 1996. pp. 414-778
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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