Accelerating Eulerian Fluid Simulation With Convolutional Networks

Efficient simulation of the Navier-Stokes equations for fluid flow is a long standing problem in applied mathematics, for which state-of-the-art methods require large compute resources. In this work, we propose a data-driven approach that leverages the approximation power of deep-learning with the precision of standard solvers to obtain fast and highly realistic simulations. Our method solves the incompressible Euler equations using the standard operator splitting method, in which a large sparse linear system with many free parameters must be solved. We use a Convolutional Network with a highly tailored architecture, trained using a novel unsupervised learning framework to solve the linear system. We present real-time 2D and 3D simulations that outperform recently proposed data-driven methods; the obtained results are realistic and show good generalization properties.Comment: Significant revisio

Control of grain size in sublimation-grown CdTe, and the improvement in performance of devices with systematically increased grain size

A method to control the grain size of CdTe thin films deposited by close space sublimation using chamber pressure is demonstrated. Grain diameter is shown to increase in the pressure range 2–200 Torr, following the linear relationship D (?m)=0.027×P (Torr)+0.90. A mechanism is proposed to explain the dominance of the 111 preferred orientation in the small-grained, but not the large-grained films. For a series of CdTe/CdS solar cells in which the only variable was grain size, the performance parameters were seen to increase from 0.54% (0.94 ?m grains) up to a plateau of 11.3% (?3.6 ?m grains). This corresponds to the point at which the series resistance is no longer dominated by grain boundaries, but by the contacts

Policy-­Making in Hard Times: The Case of Southern European Labour Reforms

Introduction: For many orthodox economists, the never-ending Euro crisis that began in late 2007 confirmed the wisdom of their long-standing crusade to transform the rules governing Southern European labor markets. These arguments were embraced by the Troika formed by the European Commission, the IMF and the European Central Bank, which declared poorly designed labor market institutions to be among the most serious ailments afflicting Greece, Italy, Portugal and Spain. The reluctance of political elites in these countries to challenge claims that the crisis was a product of domestic institutional shortcomings and their unwillingness to consider Euro exit thus pushed institutional reform to the top of the domestic political agenda

Tami Spry:The force of (co-)performing

In this short article, we work with the notion of Tami Spry as force. There is a tension here: We have come to recognize, both through the writing of this article and through our many years of encountering both Tami herself and Tami’s work as performer and writer, how we find ourselves needing to de-personalize and de-individualize: we are drawn into the beyond, the uncontainable, the “more-than,” of Tami and Tami’s work. At the same time as this impulse to de-personalize and de-individualize, we recognize—and cherish—that Tami Spry’s work could not happen without Tami Spry. We experience, and seek to convey here, our respect, our gratitude, our love, both for a person we are privileged to call our friend and for a body of work, whether performed, written or performed in writing, that is committed to the personal, the vulnerable, the intimate and the embodied

Between-ing:Collaborative writing and the unfoldings of relational space

In conversation with Claire Parnet, Deleuze is quoted as saying, “(w)e were only two, but what was important for us was less our working together than this strange fact of working between the two of us.” Deleuze’s concept of “between-the-two” has been used by “Gale and Wyatt,” as a leitmotif for the collaborative writing with which they have engaged “between the two” and also in collaboration with others. The persistence and longevity of this usage has led to the possibility that an “image of thought” has been brought to life which is constitutive of the “us” rather than the “betweened.” In this, have “Gale and Wyatt” continued to swim in the calm, unquestioning, and welcoming waters of qualitative inquiry? Have they, in so doing, avoided those eddies, swirls, rip currents, and deep, dark waters of post qualitative inquiry that might be working to pull them out into the turbulent seas of free and wild concept making where, in becoming, their writing might move away from the applications and representations of simply human-centric thought and action and be of a more immanent doing? In this article, “Gale and Wyatt” address their alertness to the doing of this image of thought. They ask, does their collaborative writing rest more on the “two” of them, the people doing the writing, than on the “between” that talks more the materiality of relational space(s) unfolding amid them? In this article, they affirmatively critique this possibility. They ask: Between the two? How does this betweening work? What does this betweening do? Only two