פרסומים

Many optoelectronic devices, such as solar cells and LEDs, require materials that possess both transparency and conductivity. Indium tin oxide (ITO), the most commonly used transparent conductor, is limited to flat thin films and, therefore, cannot be used in 3D electronics. Herein, we present the fabrication of complex 3D ITO structures at sub-micron resolution via multiphoton absorption polymerization (MAP), a vat photopolymerization technology, by combining sol-gel chemistry and radical polymerization. Following the MAP fabrication, heat treatment is applied to convert the gel into a ceramic ITO. The sintering temperature affects the porosity, electrical conductivity, and transparency of the printed ITO structures. Electrical conductivity was measured for printed objects sintered at temperatures starting at 700 °C up to 1150 °C with a maximum bulk conductivity of 14.47 ± 1.54 S/cm at 1000 °C and maximal transparency above 90 %. Enabling the fabrication of full 3D conductive ITO micro-structures via MAP, this work unlocks new possibilities and perspectives for the fabrication of 3D optoelectronic devices with transparent and conductive components.

Paper won Best Student Paper Award from the International Transport Economics Association (ITEA 2022)

Ancient and medieval rhetorical theorists gave much attention to discovering an author’s intent (voluntas) from the letter of a document (scriptum). By contrast, resolving ambiguity (ambiguitas) was supposedly easy. But in fact, ambiguity proves the more slippery problem because it functions somewhere between argumentation (a controversy to be disputed) and stylistic embellishment. Legal discourse often tried to impose limits on ambiguity, but at the same time ambiguitas could be quietly weaponized — in both law and poetry — to transform legal and even theological meaning. Where rhetorical theorists such as Cicero, Quintilian, Augustine, William of Champeaux (c. 1100), Geoffrey of Vinsauf (c. 1210), and Boncompagno da Signa (c. 1235), as well as legal theorists such as Henry de Bracton, try to pin down how ambiguity works, poets such as William Langland seem to revel in the slippages that it affords.

January 2024: Rita Copeland is Sheli Z. and Burton X. Rosenberg Chair in the Humanities and Professor of Classics, English, and Comparative Literature at the University of Pennsylvnia.  Her publications include  Rhetoric, Hermeneutics, and Translation in the Middle Ages (Cambridge, 1991); Criticism and Dissent in the Middle Ages (Cambridge, 1996); Pedagogy, Intellectuals and Dissent in the Later Middle Ages (Cambridge 2001); Medieval Grammar and Rhetoric:  Language Arts and Literary Theory, AD 300-1475 (with I. Sluiter; Oxford, 2009); The Cambridge Companion to Allegory (with P. Struck; 2010), The Oxford History of Classical Reception in English Literature, 800-1558 (2016), and most recently, Emotion and the History of Rhetoric in the Middle Ages (Oxford, 2021).  She was a co-founder of the journal New Medieval Literatures.  She is General Editor (with the late Peter Mack) of the forthcoming Cambridge History of Rhetoric in five volumes.  She has been the recipient of NEH, ACLS, American Philosophical Society, and Guggenheim fellowships.  She is a Fellow of the Medieval Academy of America.  She has been a visiting professor at Hebrew University, University of Iceland, and University of Oxford, and a visiting fellow at the Warburg Institute, London.

POGZ (Pogo transposable element derived with ZNF domain) is known to function as a regulator of gene expression. While variations in the gene have been associated with intellectual disabilities and developmental delays in humans, the exact pathophysiological mechanisms remain unclear. To shed light on this, we created two lines of conditional knockout mice for , one specific to excitatory neurons (Emx1-Pogz mice) and the other to inhibitory neurons (Gad2-Pogz mice) in the brain. Emx1-Pogz mice showed a decrease in body weight, similar to total knockout mice. Although the two lines did not display significant morphological abnormalities in the telencephalon, impaired POGZ function affected the electrophysiological properties of both excitatory and inhibitory neurons differently. These findings suggest that these mouse lines could be useful tools for clarifying the precise pathophysiological mechanisms of neurodevelopmental disorders associated with gene abnormalities.

‘Outdegree’ from directed graph theory is used to measure the salience of individual locations in the transmission of Covid-19 morbidity through the spatiotemporal network of contagion and their salience in the spatiotemporal diffusion of vaccination rollout. A spatial econometric model in which morbidity varies inversely with vaccination rollout, and vaccination rollout varies directly with morbidity is used to calculate dynamic auto-outdegrees for morbidity, and dynamic cross-outdegrees for the effect of vaccination on morbidity. The former identifies hot spots of contagion, and the latter identifies locations in which vaccination rollout is particularly effective in reducing national morbidity. These outdegrees are calculated analytically rather than simulated numerically.