ORCID Profile
0000-0003-1947-0806
Current Organisation
Centre National de la Recherche Scientifique
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Wiley
Date: 04-07-2017
Abstract: Organo-lead halide perovskites (OHPs) have recently emerged as a new class of exceptional optoelectronic materials, which may find use in many applications, including solar cells, light emitting diodes, and photodetectors. More complex applications, such as lasers and electro-optic modulators, require the use of monocrystalline perovskite materials to reach their ultimate performance levels. Conventional methods for forming single crystals of OHPs like methylammonium lead bromide (MAPbBr
Publisher: No publisher found
Date: 2021
Publisher: John Benjamins Publishing Company
Date: 26-04-2021
Publisher: Wiley
Date: 11-2019
Publisher: John Benjamins Publishing Company
Date: 19-09-2017
Abstract: The issue of lexical flexibility is best tackled as the articulation of two separate mappings: one that assigns lexical items to word classes another one that associates these word classes with the syntactic functions they can access. A language may endow its lexemes with more or less multicategoriality, and its word classes with more or less multifunctionality: these are two distinct facets of lexical flexibility, which should be assessed separately. Focusing on Hiw, an Oceanic language of northern Vanuatu, I show that lexical flexibility is there mostly due to the high multifunctionality of its word classes, each of which can regularly access a broad array of syntactic functions. Conversely, Hiw ranks relatively low on the scale of multicategoriality: most of its lexemes are assigned just one word class. This is how a language can be grammatically flexible, yet lexically rigid.
Publisher: Project MUSE
Date: 06-2022
DOI: 10.1353/OL.2022.0017
Publisher: John Benjamins Publishing Company
Date: 05-08-2014
Publisher: Springer Science and Business Media LLC
Date: 20-09-2017
DOI: 10.1038/S41467-017-00588-3
Abstract: Hybrid organic-inorganic halide perovskites are low-cost solution-processable solar cell materials with photovoltaic properties that rival those of crystalline silicon. The perovskite films are typically sandwiched between thin layers of hole and electron transport materials, which efficiently extract photogenerated charges. This affords high-energy conversion efficiencies but results in significant performance and fabrication challenges. Herein we present a simple charge transport layer-free perovskite solar cell, comprising only a perovskite layer with two interdigitated gold back-contacts. Charge extraction is achieved via self-assembled monolayers and their associated dipole fields at the metal-perovskite interface. Photovoltages of ~600 mV generated by self-assembled molecular monolayer modified perovskite solar cells are equivalent to the built-in potential generated by in idual dipole layers. Efficient charge extraction results in photocurrents of up to 12.1 mA cm −2 under simulated sunlight, despite a large electrode spacing.
Publisher: John Benjamins Publishing Company
Date: 02-07-2019
Publisher: John Benjamins Publishing Company
Date: 31-12-2011
Abstract: This study describes and explains the paradox of related languages in contact that show signs of both linguistic ergence and convergence. Seventeen distinct languages are spoken in the northernmost islands of Vanuatu. These closely related Oceanic languages have evolved from an earlier dialect network, by progressive ersification. Innovations affecting word forms — mostly sound change and lexical replacement — have usually spread only short distances across the network their accumulation over time has resulted in linguistic fragmentation, as each spatially-anchored community developed its own distinctive vocabulary. However, while languages follow a strong tendency to erge in the form of their words, they also exhibit a high degree of isomorphism in their linguistic structures, and in the organization of their grammars and lexicons. This structural homogeneity, typically manifested by the perfect translatability of constructions across languages, reflects the traditions of mutual contact and multilingualism which these small communities have followed throughout their history. While word forms are perceived as emblematic of place and diffuse to smaller social circles, linguistic structures are left free to diffuse across much broader networks. Ultimately, the effects of ergence and convergence are the end result, over time, of these two distinct forms of horizontal diffusion.
Publisher: Cold Spring Harbor Laboratory
Date: 10-01-2022
DOI: 10.1101/2022.01.10.475623
Abstract: The Vanuatu archipelago served as a gateway to Remote Oceania during one of the most extensive human migrations to uninhabited lands, ~3,000 years ago. Ancient DNA studies suggest an initial settlement by East Asian-related peoples that was quickly followed by the arrival of Papuan-related populations, leading to a major population turnover. Yet, there is uncertainty over the population processes and the sociocultural factors that have shaped the genomic ersity of ni-Vanuatu, who present nowadays among the world’s highest linguistic and cultural ersity. Here, we report new genome-wide data for 1,433 contemporary ni-Vanuatu from 29 different islands, including 287 couples. We find that ni-Vanuatu derive their East Asian- and Papuan-related ancestry from the same source populations and descend from relatively synchronous, sex-biased admixture events that occurred ~1,700-2,300 years ago, indicating a peopling history common to all the archipelago. However, East Asian-related ancestry proportions differ markedly across islands, suggesting that the Papuan-related population turnover was geographically uneven. Furthermore, we detect Polynesian ancestry arriving ~600-1,000 years ago to South Vanuatu in both Polynesian- and non-Polynesian-speaking populations. Lastly, we provide evidence for a tendency of spouses to carry similar genetic ancestry, when accounting for relatedness avoidance. The signal is not driven by strong genetic effects of specific loci or trait-associated variants, suggesting that it results instead from social assortative mating. Altogether, our findings provide insight into both the genetic history of ni-Vanuatu populations and how sociocultural processes have shaped the ersity of their genomes.
Publisher: John Benjamins Publishing Company
Date: 2015
Publisher: Walter de Gruyter GmbH
Date: 06-2022
Abstract: Whether it is based on philological data or on reconstruction, historical linguistics formulates etymological hypotheses that entail changes both in form and in meaning. Semantic change can be understood as a change in “patterns of lexification”, i. e., correspondences between forms and senses. Thus a polysemous word, which once lexified senses s1–s2–s3, evolves so it later encodes s2–s3–s4. Meanings that used to be colexified are now dislexified, and vice versa. Leaning on empirical data from Romance and from Oceanic, this study outlines a general model of historical lexicology, and identifies five types of structural innovations in the lexicon: split, merger, competition, shift, and relexification. The theoretical discussion is made easier by using a visual approach to structural change, in the form of diachronic maps. Semantic maps have already proven useful to represent synchronic patterns of lexification, outlining each language’s emic categories against a grid of etic senses. The same principle can be profitably used when analysing lexification patterns in diachrony: lexical change is then viewed as the reconfiguration of sense clusters in a semantic space. Maps help us visualize the “lexical tectonics” at play as words evolve over time, gradually shifting their meaning, gaining or losing semantic territory, colliding with each other, or disappearing forever.
Publisher: John Benjamins Publishing Company
Date: 02-07-2019
No related grants have been discovered for Alexandre François.