Search results for "convers"

Lanthanide-doped Y3Ga5O12 garnets for nanoheating and nanothermometry in the first biological window

2018

Abstract Absorption and luminescence spectra in the first biological window of Nd3+ single-doped and Er3+-Yb3+ co-doped Y3Ga5O12 nano-garnets have been studied to evaluate their potential use as simultaneous optical nanoheaters and nanothermometers in biomedicine. Nd3+-doped nano-garnets uses the 808 nm laser radiation, resonant with the largest absorption peak of the 4I9/2 → 4F5/2 transition, for both heating the nanoparticle and populating the 4F3/2 emitting level. Changes in the relative intensities of different emission peaks between Stark levels of the 4F3/2 (R1,2)→4I9/2 (Z1-5) transition can be directly related to the temperature of the nano-garnet. On the other hand, the Yb3+/Er3+com…

Hydrogen bond-mediated conjugates involving lanthanide diphthalocyanines and trifluoroacetic acid (Lnpc2@TFA): Structure, photoactivity, and stability

2020

The interaction between lanthanide diphthalocyanine complexes, LnPc2 (Ln = Nd, Sm, Eu, Gd, Yb, Lu

The impact of conversion on the risk of major complication following laparoscopic colonic surgery: an international, multicentre prospective audit.

2018

BACKGROUND: Laparoscopy has now been implemented as a standard of care for elective colonic resection around the world. During the adoption period, studies showed that conversion may be detrimental to patients, with poorer outcomes than both laparoscopic completed or planned open surgery. The primary aim of this study was to determine whether laparoscopic conversion was associated with a higher major complication rate than planned open surgery in contemporary, international practice.METHODS: Combined analysis of the European Society of Coloproctology 2017 and 2015 audits. Patients were included if they underwent elective resection of a colonic segment from the caecum to the rectosigmoid jun…

Experimental characterization of Ruthenium-based Dye Sensitized Solar Cells and study of light-soaking effect impact on performance

2016

In this paper, we present an experimental investigation on the performance of Ruthenium-based Dye Sensitized Solar Cells (DSSCs) at different irradiance levels, incident wavelengths and hours of illumination. In particular, the measurements have been aimed at studying the performance variation due to light soaking effect since this phenomenon has noteworthy practical implications, such as stability tests of DSSCs. Our results show that the short circuit current density, the open circuit voltage and the conversion efficiency η increase with the hours of light soaking. Finally, the observed phenomenon is reversible, and thus the performance decreases again when the cell is kept in the dark.

Pisanie pomiędzy kulturami : twórczość obcojęzyczna pisarek z Europy Środkowej

2015

Harvesting Fluorescence from Efficient Tk -> Sj (j, k > 1) Reverse Intersystem Crossing for ??* Emissive Transition-Metal Complexes

2013

Using a bimetallic Au(I) complex bearing alkynyl-(phenylene)3-diphosphine ligand (A-3), we demonstrate that the fluorescence can be exquisitely harvested upon T1 → Tk (k > 1) excitation followed by Tk → Sj (j, k > 1) intersystem crossing (ISC) back to the S1 state. Upon S0 → S1 355 nm excitation, the S1 → T1 intersystem crossing rate has been determined to be 8.9 × 108 s–1. Subsequently, in a two-step laser pump–probe experiment, following a 355 nm laser excitation, the 532 nm T1 → Tk probing gives the prominent blue 375 nm fluorescence, and this time-dependent pump–probe signal correlates well with the lifetime of the T1 state. Careful examination reveals the efficiency of Tk → Sj (j, k > …

Synthesis of new orthometallated iridium(III) compounds by chemical and electrochemical methods

1987

Abstract Replacement of one phosphine ligand in IrCl 3 (η 2 -PCBr)(η 1 -PCBr) ( 1 ) (PCBr = P( o -BrC 6 F 4 )Ph 2 ), by various P-donor ligands has given compounds of stoichiometry IrCl 3 (η 2 -PCBr)L ( 3 : L = PMePh 2 ; 4 : L = P( p -MeC 6 H 4 ) 3 ; 5 : L = P(OMe) 3 , 6 : L = P(OPh) 3 ). All of these show two irreversible reduction peaks in the range −1.1, −1.3 and ca. −2.0 V. The electrochemical reduction of compound 1 at −1.5 V (at 0°C) leads to a very reactive iridium(I) species, probably IrCl(PCBr) 2 , which undergoes intramolecular orthometallation at room temperature. Three compounds are obtained as the results of this chemical conversion: IrBr 2 (PC)(PCBr) ( 7 ), IrCl 2 (PC)(PCBr) (…

Las funciones interactivas del marcador español ‘¿no?’ Las fronteras entre la atenuación y la protección de la imagen

2020

In this paper the functions of the Spanish discourse marker ?no? are analysed from a pragmatic and an interactive perspective. Specifically, we explore the values of ?no? taking the pragmatic phenomena of mitigation and boosting, as well as the notion of affiliation as described in conversation analysis. The previous literature devoted to the study of this linguistic form has consistently identified its uses as a confirmation request or a phatic device (Fuentes, 1990, 2009; Santos Rio, 2003; Garcia Vizcaino, 2005; Montanez, 2008, 2015; Rodriguez Munoz, 2009; Moccero, 2010; Santana, 2017). This work, however, analyses how the mitigating uses interact and share features with neighbouring cate…

From noticing to initiating correction: Students’ epistemic displays in instructional interaction

2014

Abstract By drawing on conversation analysis and the analysis of embodiment-in-interaction, this article describes students’ locally situated, interactional practices of demonstrating knowledge in teacher-led instructional interaction in the English lessons of a Content-and-Language-Integrated-Learning (CLIL) class. It focuses on students’ correction initiations that are preceded by embodied noticings – interactional events that are performed through different kinds of visibly intensified embodied and material practices. The analysis demonstrates how the embodied noticings serve as a preamble to the ensuing correction initiation and help project participant's stance toward the noticed featu…

Lexical cohesion revisited. A combined corpus and systemic-functional analysis

2018

In this chapter I argue for a refinement of the classic SFL approach to lexical cohesion. First, a literature overview is provided in which key principles and related categories are examined. In addition, the connection of cohesion and discourse co-herence is addressed and an overview is provided of the wide range of applications that the former has in such fields as genre studies, language teaching and learning, psycholinguistics and computational linguistics, among others. The core SFL models of cohesion are then revisited in order to propose a modified taxonomy of lexical co-hesion, involving five distinct types (repetition, synonymy, opposition, inclusion and association) that are cross…