146 resultados para LII


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Abnormal “polymer-in-salt” conduction behavior is observed in a solid electrolyte composed of lithium iodide (LiI) and 3-hydroxypropionitrile (HPN). Based on comprehensive investigations by X-ray diffraction (XRD) and Raman and infrared spectroscopy, this abnormal conduction behavior is attributed to the formation of new ionic associates [Lim +In−]· · ·N C (m> n) and the reinforced hydrogen bonding of I· · ·HO in the electrolyte at high LiI concentrations.

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A previous B-11 nuclear magnetic resonance investigation of glasses belonging to the B2S3-Li2S-LiI system had allowed the authors to determine the variation of the number of three and four coordinated boron atoms with composition. These results, in addition to the observation that vitreous B2S3 quite easily forms fibres during casting, have led us to propose structural hypotheses for B2S3 based glasses, which are supported by the present Raman spectroscopy study. For vitreous B2S3 the spectra were accounted for on the basis of the various types of BS3/2 triangles proposed by the model. Molecular orbital considerations allowed us to assign the most significant lines for the binary glasses by assuming that BS3/2 triangles (with or without nonbridging sulphur atoms) and BS4 tetrahedra were present. In the ternary system, lithium iodide has been found to interact slightly on the structural entities, altering their vibrational characteristics without fundamentally modifying their nature.

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In the present study, the effect of iodine concentration on the photovoltaic properties of dye sensitized solar cells (DSSC) based on TiO2 nanoparticles for three different ratios of lithium iodide (LiI) and iodine (I-2) has been investigated. The electron transport properties and interfacial recombination kinetics have been evaluated by electrochemical impedance spectroscopy (EIS). It is found that increasing the concentration of lithium iodide for all ratios of iodine and lithium iodide decreases the open-circuit voltage (V-oc) whereas short circuit current density (J(sc)) and fill factor (FF) shows improvement. The reduction in V-oc and increment in J(sc) is ascribed to the higher concentration of absorptive Li+ cations which shifts the conduction band edge of TiO2 positively. The increase in FF is due to the reduction in electron transport resistance (R-omega) of the cell. In addition for all the ratios of LiI/I-2 increasing the concentration of I-2 decreases the V-oc which is attributed to the increased recombination with tri-iodide ions (I-3(-)) as verified from the low recombination resistance (R-k) and electron lifetime (tau) values obtained by EIS analysis. (C) 2012 Elsevier Ltd. All rights reserved.

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Contenido: El aristotelismo y el tomismo frente al egoísmo psicológico / María L. Lukac de Stier – El deseo natural de ver a Dios en la Summa contra Gentiles / Guillermo Jorge Cambiasso – La creación como encuentro del ser y de la nada en la teología del maestro Eckhart de Hochheim O.P. (1260-1327) / Brian J. Farrelly – Malebranche y el libertinage érudit / Francisco Leocata – The problem of person and Jean Mouroux / John M. McDermott ; Glenn J. Comandini – Los fundamentos de la Bioética de H. Tristram Engelhardt / Jorge Martínez Barrera – Cuando las contradictorias son verdaderas / Marisa Villalba de Tablón – Examen del escepticismo moral y del relativismo moral / Camilo Tale – Saint Thomas et le mystère de la création : une réponse aux interrogations de l’homme d’aujourd’hui / Marie-Dominique Philippe – La finalidad de la naturaleza humana : alcance y actualidad de la cuestión / Beatriz Eugenia Reyes Oribe – La providencia y el gobierno del mundo / Alberto Caturelli – Saint Thomas et le problème de la possibilité d’un univers créé éternel / Alain-Marie de Lassus – La causalidad material de los elementos en la generación de los cuerpos mixtos / Mario Enrique Sacchi -- Bibliografía

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Nota del Director: "La presentación de esta revista Teología coincide con un momento de fiesta grande para nuestra Facultad: la celebración del Congreso del Centenario. De allí que este número quiera expresar la alegría que nos produce encontrarnos a hablar de teología, para recordar nuestras raíces, afrontar las exigencias de los desafíos de nuestro tiempo e imaginar un futuro. La teología es un quehacer creativo: pues es hermenéutica del mundo comprendido desde la fe; porque además es profecía, vinculando el presente con el futuro y haciéndonos responsables de las respuestas para hoy y de los proyectos para el tiempo que se avecina; y también es memoria, reconociendo que ella se hace con una comunidad que nos antecedió, es diálogo con las experiencias pasadas y aprendizaje de quienes hablaron antes que nosotros. En este sentido, pensar debe integrar el tiempo en sus dimensiones. Este número de nuestra revista presenta un grupo de textos que muestran esos diversos registros en los que la teología desarrolla su tarea..."

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Nota del Director -- La ley de gradualidad en la Relatio Synodi de la III Asamblea General Extraordinaria del Sínodo de Obispos : Los desafíos pastorales sobre la familia en el contexto de la evangelización / Luis Alfredo Anaya -- La ley nueva y la nueva evangelización : la tradición tomista y la perspectiva moral de Evangelii gaudium / Luis D. Malaspina -- Mons. Enrique Angelelli, testigo de la fe / Pablo Nazareno Pastrone -- La relación entre la institución y los carismas en cuatro autores europeos contemporáneos / Juan Bautista Duhau -- Desde el símbolo guadalupano : algunos criterios para el momento pastoral / Leandro Horacio Chitarroni -- San Vicente de Paúl y la oración / Andrés Motto -- Elogio de la teología / Adolphe Gesché -- Hablar de Dios en el nuevo escenario científico y cultural / Gonzalo Zarazaga -- Diálogo teológico con Walter Kasper : la recepción de la eclesiología conciliar en la Argentina / Carlos María Galli -- Notas bibliográficas

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The electrochemical oxidation of 1-butyl-3-methylimidazolium iodide, [C(4)mim]I, has been investigated by cyclic voltammetry at a platinum microelectrode at varying concentrations in the RTIL 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [C(4)mim][NTf2]. Two oxidation peaks were observed. The first peak is assigned to the oxidation of iodide to triiodide, in an overall two-electron process: 3I(-)- 2e(-) -> I-3(-). At higher potentials, the electrogenerated triiodide oxidizes to iodine, in an overall one-electron process: I-3(-) - e(-) -> 3/2I(2). An average diffusion coefficient, D, for I- of 1.55 x 10(-11) m(2) s(-1) was obtained. A digital simulation program was used to simulate the voltammetric response, and kinetic parameters were successfully extracted. The parameters deduced from the simulation include D for I-, I-3(-), and I-2 and K-eq,K-2, the equilibrium constant for the reaction of iodide and iodine to form triiodide. Values for these parameters are of the same order as those previously published for the oxidation of Br- in the same RTIL [Allen et al. J. Electroanal. Chem. 2005, 575, 311]. Next, the cyclic voltammetry of five different inorganic iodide salts was studied by dissolving small amounts of the solid in [C(4)mim][NTf2]. Similar oxidation peaks were observed, revealing diffusion coefficients of ca. 0.55, 1.14, 1.23, 1.44, and 1.33 x 10(-11) m(2) s(-1) and solubilities of 714, 246, 54, 83, and 36 mM for LiI, NaI, KI, RbI, and CsI, respectively. The slightly smaller diffusion coefficients for the XI salts (compared to [C(4)mim]I) may indicate that I- is ion-paired with Li+, Na+, K+, Rb+, and Cs+ in the RTIL medium.

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Comprend : Fol. Diijr° - Sit nomen Domini benedictum in seculum (Fuga, à 4 v.) - Fol. Ej r° - Morior ego, si non habuero (Fuga, à 5 v.) - Fol. Ej r° - Fuga à 5 v. - Fol. Ej v° - Fuga à 2 v. - Fol. Ej v° - Fuga à 5 v. - Fol. Eij r° - Fuga à 5 v. - Fol. Eij v° - Fuga à 2 v. - Fol. Eiij v° - Fuga à 2 v. - Fol. Eiv r° - Fuga à 5 v. - Fol. Eiv v° - Fuga à 2 v. - Fol. F j r° - Canon à 3 v. - Fol. I j v° - Elegantia super Languir me fault (à 2 v.) - Fol. I ij v° - C'est à grant tort (Aliud exemplum, à 2 v.) - Fol. iiij v° - Fuga à 4 v. - Fol. Kiij r° - In omnibus requiem (à 1 v.) - Fol. Kiij v° - Salve sancta parens (à 1 v. (le début d'une autre voix sur la même portée en ms.)) - Fol. Liij r° - Vanitas vanitatum (à 4 v.) - Fol. Liij v° - Dixit Dominus (à 4 v.) - Fol. Liiij r° - Dixit Dominus (à 5 v. et faux-bourdon) - Fol. Liiij v° - O vos omnes (à 4 v.) - Fol. N j r° - Omnis arbor (à 2 v.) - Fol. N j v° - Pleni sunt coeli (à 2 v.) - Fol. Nij v° - Pleni sunt coeli (à 2 v.) - Fol. Niij r° - Christus spes mea (à 3 v.) - Fol. Niij r° - Et expecto resurectionem mortuorum (à 3 v.) - Fol. Niij v° - Pleni sunt coeli (à 3 v.) - Fol. Niiij v° - A solis ortu cardine ([Hymne], à 4 v.) - Fol. O j v° - [Canon] à 4 v. - Fol. O j v° - Revertere (à 4 v.) - Fol. O j v° - Adolescens graditur (à 5 v.) - Fol. Oij r° - Dominus mihi adiutor (Fuga, à 5 v.) - Fol. Oij v° - Surrexit Christus hodie (à 5 v.) - Fol. Oiij v° - Christus pro nobis passus est (à 5 v.) - Fol. Oiiij v° - Agnus Dei (à 6 v.) - Fol. Pj v° - [Pièce sans texte] (à 6 v.) - Fol. Pij v° - Sumite psalmum (Fuga, à 6 v.) - Fol. Pij v° - Nobilis est (Fuga, à 6 v.) - Fol. Piij r° - Ambulate dum lucem habetis (Fuga, à 7 v.) - Fol. Piij r° - Sancta Trinitas (Fuga, à 7 v.) - Fol. Piij v° - Omnis consummationis vidi finem (Canon, à 8 v. dont 4 notées)

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N,N-Dimethyl-pyrrolidinium iodide, and the effect of doping with LiI, has been investigated using DSC, NMR, and impedance spectroscopy. It was found that the addition of a small amount of LiI enhances the ionic conductivity by up to 3 orders of magnitude for this ionic solid. Furthermore, a slight decrease in phase transition onset temperatures, as well as the appearance of a superimposed narrow line in the 1H NMR spectra with dopant, suggest that the LiI facilitates the mobility of the matrix material, possibly by the introduction of vacancies within the lattice. 7Li NMR line width measurements reveal a narrow Li line width, decreasing in width and increasing in intensity with temperature, indicating mobile Li ions.

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Gellan-based polymer electrolytes (PEs), doped with lithium iodide (LiI), were prepared and their electrical properties were characterized. The samples are thermally stable up to 234 degrees C and exhibit ionic conductivity of 3.8 x 10(-4) S/cm at room temperature for the sample doped with 40 wt% of LiI. Addition of 10 wt% of glycerol promotes an increase of the ionic conductivity to 1.5 x 10(-3) S/cm, which remains stable up to 100 degrees C. The activation energies of 2.4 to 12.4 kJ/mol were derived from the Arrhenius model. The repeated ionic conductivity measurements as a function of temperature show that these membranes can be reversibly used between the room temperature and 100 degrees C.

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Ionic conducting membranes of gelatin plasticized with glycerol and containing LiI/I-2 have been obtained and characterized by X-ray diffraction measurements, UV-Vis-NIR spectroscopy, thermal analysis and impedance spectroscopy. The transparent (80-90% in the visible range) membranes showed ionic conductivity value of 5 x 10(-5) S/cm at room temperature, which increased to 3 x 10(-3) S/cm at 80 degrees C. All the ionic conductivity measurements as a function of temperature showed VTF dependence and activation energy of 8 kJ/mol. These samples also showed low glass transition temperature of -76 degrees C. Moreover the samples were predominantly amorphous. The membranes applied to small electrochromic devices showed 20% of color change from colored to bleached states during more than 70 cronoamperometric cycles.