Enseñanza de la post-escritura centrada en la forma en los procesos de las clases de composición escrita orientadas hacia el género: Efectos en la precisión de la escritura de los estudiantes de segunda lengua

Recent findings have provided growing evidence in support of process-genre-oriented writing pedagogy. However, these types of approaches tended to place form-focused instruction (FFI) in the background, particularly the explicit teaching of grammar (i.e., isolated FFI). As such, limited improvement in writing accuracy was reported by recent studies. It is, therefore, important to look into how isolated FFI might further improve this aspect of writing within process-genre-oriented writing classrooms. Thus, the current study investigates the effects of post-writing isolated FFI (post-FFI) on second language (L2) writing accuracy within this writing environment. Using mixed methods quasi-experimental design, the findings show that post-FFI benefits students as it improved their overall writing accuracy, particularly errors that impede meaning (levels 2 and 3 errors). This improvement was attributed to noticing, contextualised learning of forms, and students’ psycholinguistic readiness as supported by students’ qualitative responses. Nonetheless, some challenges were also reported by students regarding the intervention. Implications for L2 writing pedagogy and future research are discussed.Recientes hallazgos han proporcionado una creciente evidencia en apoyo de la pedagogía de la escritura procesual orientada al género. Sin embargo, estos tipos de enfoques tienden a colocar la instrucción centrada en la forma (FFI) en un segundo plano, en particular la enseñanza explícita de la gramática (es decir, FFI aislado). Por ello, los estudios recientes informan de una mejora limitada en la precisión de la escritura. Por lo tanto, es importante investigar cómo la FFI aislada podría mejorar aún más este aspecto de la escritura dentro de las aulas de escritura como proceso orientadas al género. El presente estudio investiga los efectos del FFI aislado en la post-escritura (post-FFI) en la precisión de la escritura de la segunda lengua (L2) dentro de este entorno de escritura. Utilizando un diseño cuasi-experimental de métodos mixtos, los resultados muestran que el post-FFI beneficia a los estudiantes, ya que mejora su precisión general en la escritura, particularmente los errores que impiden el significado (errores de nivel 2 y 3). Esta mejora se atribuyó a la atención, al aprendizaje contextualizado de las formas y a la preparación psicolingüística de los estudiantes, tal y como se desprende de sus respuestas cualitativas.&nbsp

The Long-term Diffusion of Digital Platforms — An Agent-based Model

In recent years, many industries have experienced the rise of digital platforms (e.g., eBay, Uber, or Takeaway.com). A common characteristic of these concepts is that they focus on fragmented markets populated by many small firms, which often show a high fluctuation. However, established diffusion models based on Bass (1969) do not account for fluctuation in the market potential, although the exit of adopters and the entry of new firms could change the diffusion curve significantly. Thus, we propose an extension of the Bass Model to account for the exit and entry of (potential) adopters and empirically test this framework in a real-world setting. Using two decades of adopter data of leading digital platforms and information on the complete market potential, we employ agent-based models to analyze the effects of fluctuation on the platform diffusion. Initial results confirm the existence of high fluctuation and indicate relevant impacts on the diffusion curve

Input Specificity and the Propagation of Idiosyncratic Shocks in Production Networks

This article examines whether firm-level idiosyncratic shocks propagate in production networks. We identify idiosyncratic shocks with the occurrence of natural disasters. We find that affected suppliers impose substantial output losses on their customers, especially when they produce specific inputs. These output losses translate into significant market value losses, and they spill over to other suppliers. Our point estimates are economically large, suggesting that input specificity is an important determinant of the propagation of idiosyncratic shocks in the economy

Investigation of laser induced phosphorescence and fluorescence of acetone at low pressure for molecular tagging velocimetry in gas microflows

This paper was presented at the 4th Micro and Nano Flows Conference (MNF2014), which was held at University College, London, UK. The conference was organised by Brunel University and supported by the Italian Union of Thermofluiddynamics, IPEM, the Process Intensification Network, the Institution of Mechanical Engineers, the Heat Transfer Society, HEXAG - the Heat Exchange Action Group, and the Energy Institute, ASME Press, LCN London Centre for Nanotechnology, UCL University College London, UCL Engineering, the International NanoScience Community, www.nanopaprika.eu.Laser-induced fluorescence and phosphorescence properties of gaseous acetone in argon are measured and analyzed in a pressure ranging from 10(5) to 10(2) Pa, with the aim of analyzing by molecular tagging velocimetry gas microflows in rarefied regimes which requires operation at low pressure. Acetone is excited at a wavelength of 266 nm and immediately emits short lifetime fluorescence rapidly followed by long lifetime phosphorescence. At atmospheric pressure, the early phosphorescence intensity is more than 600 times lower than the fluorescence one. The phosphorescence signal is rapidly decreasing with time, closely following a power law. Both fluorescence and phosphorescence signals are decreasing with pressure. The systematic analysis of fluorescence and phosphorescence of acetone molecules shows that although the signal is dramatically reduced at low pressure, the on-chip integration technique and the optimization of the acquisition parameters provide an exploitable signal for molecular tagging velocimetry in rarefied microflows, in a Knudsen number range corresponding to the early slip flow regime

Genetic Changes Over Breeding Generations of \u3cem\u3eFestulolium\u3c/em\u3e

Festulolium hybrids are a valuable breeding source for tolerance to abiotic stress and to make grass more persistent under drought and in cold environments. In 2004, the EU Commission enlarged the definition of Festulolium which may now include all hybrids between Lolium sp. and Festuca sp. and not only those between L. multiflorum and F. pratensis. We here report allele frequencies at two unlinked PCR-based marker loci in populations derived from tetraploid (2n=4x=28) L. multiflorum x F. glaucescens hybrids where breeding history enables us to test the effects of selection vs that of genetic drift

Essays on the Diffusion of Innovations in a Digital Age

Die vorliegende kumulative Dissertation ist im Rahmen und mit Förderung des DFG-Graduiertenkollegs „Betriebswirtschaftliche Aspekte lose gekoppelter Systeme und Electronic Business“ entstanden, das sich in einem Schwerpunkt mit der Diffusion von Innovationen im heutigen Digitalen Zeitalter befasst. Gerade durch das Internet haben viele Aspekte von Innovationen und ihrer Verbreitung neue Relevanz erlangt und Aufmerksamkeit in der breiten Öffentlichkeit gefunden, z.B. die Wirkung sozialer Netzwerke, die Bedeutung von räumlichen Entfernungen im Internetzeitalter oder neue Anwendungsmöglichkeiten von Online-Auktionen. Im Einzelnen umfasst diese Arbeit zwei methodische Beiträge – zu den Themen „Hazard-Raten-Modelle“ (zusammen mit Kerstin Reimer) und „Prognosegütemaße“ – und drei großzahlige empirische Studien – mit den Titeln „Did They Tell Their Friends? – Using Social Network Analysis to Detect Contagion Processes“ (zusammen mit Sönke Albers), „The Role of Spatial Proximity in the Adoption of a Digital Product“ (zusammen mit Arvind Rangaswamy, Sönke Albers und Nazrul I. Shaikh) und „Incentive-compatible Measurement of Willingness-to-Pay Using Real-life Transactions: An Application for Vickrey Auctions in Commercial Settings“ (zusammen mit Sönke Albers, Bernd Skiera und Björn Schäfers)

Sur les aspects computationnels du vote par approbation

The subject of this thesis is the study of computational aspects of approval voting. Most of the works are theoretical results about computational issues raised by approval voting, in many different settings. However, I also study some questions that are more related to classical choice theory, and some problems are investigated through experimental analysis.Firstly, I study a general family of rules for approval voting in the context of committee elections and multiple referenda. Secondly, I focus on a more general setting, approval voting in combinatorial domains, based on conditional preferences. Finally, I consider approval voting in the context of incomplete preferences, to study the possible and necessary winner problems.L'objet de cette thèse est l'étude des aspects algorithmiques du vote par approbation. Il s'agit principalement d'une étude théorique des enjeux computationnels soulevés par le vote par approbation dans des contextes de décisions variés. Cependant, j'étudie aussi des questions plus proches de la théorie classique du choix social et je conduis de brèves études expérimentales.Dans un premier temps, l'étude se porte sur une famille générale de règles de vote pour les élections de comités et les référendums multiples à l'aide du vote par approbation. Dans un second temps, je porte mon attention sur un contexte plus général, le vote par approbation sur domaines combinatoires en se basant sur des préférences conditionnelles. Finalement, je me place dans le cadre du vote avec préférences incomplètes pour étudier les problèmes de vainqueurs possibles et nécessaires dans le vote par approbation

Strategyproof and fair matching mechanism for ratio constraints

We introduce a new type of distributional constraints called ratio constraints, which explicitly specify the required balance among schools in two-sided matching. Since ratio constraints do not belong to the known well-behaved class of constraints called M-convex set, developing a fair and strategyproof mechanism that can handle them is challenging. We develop a novel mechanism called quota reduction deferred acceptance (QRDA), which repeatedly applies the standard DA by sequentially reducing artificially introduced maximum quotas. As well as being fair and strategyproof, QRDA always yields a weakly better matching for students compared to a baseline mechanism called artificial cap deferred acceptance (ACDA), which uses predetermined artificial maximum quotas. Finally, we experimentally show that, in terms of student welfare and nonwastefulness, QRDA outperforms ACDA and another fair and strategyproof mechanism called Extended Seat Deferred Acceptance (ESDA), in which ratio constraints are transformed into minimum and maximum quotas