"Indigested in the Scenes: Hamlet's Dramatic Theory and Ours"

(Forthcoming in PMLA, January 2018) Discussions of the relationship between drama and performance have been dominated by two symmetrical, emancipatory impulses. Performance scholars have, for the past half-century, sought to liberate performance from the authority of the drama. Literary scholars have, for centuries if not millennia, sought to distinguish a “literary” dimension of the dramatic text free of the flux of performance. This essay diagnoses in Shakespeare’s Hamlet an alternative story about the relationship between drama and performance. Paying refreshed attention to the earlier and less famous of Hamlet’s statements of dramatic theory—his blurb for the “excellent play” featuring Aeneas’ speech to Dido—I find Hamlet bringing drama, especially in its “literary” dimension, crashing back into performance. This collision does not reinstitute the authority of the text; rather, it radically democratizes the scene of dramatic performance by “indigesting” the behaviors of the participants therein

Spiral high-speed scanning tunneling microscopy: Tracking atomic diffusion on the millisecond timescale

Scanning tunneling microscopy (STM) is one of the most prominent techniques to resolve atomic structures of flat surfaces and thin films. With the scope to answer fundamental questions in physics and chemistry, it was used to elucidate numerous sample systems at the atomic scale. However, dynamic sample systems are difficult to resolve with STM due to the long acquisition times of typically more than 100 s per image. Slow electronic feedback loops, slow data acquisition, and the conventional raster scan limit the scan speed. Raster scans introduce mechanical noise to the image and acquire data discontinuously. Due to the backward and upward scan or the flyback movement of the tip, image acquisition times are doubled or even quadrupled. By applying the quasi-constant height mode and by using a combination of high-speed electronics for data acquisition and innovative spiral scan patterns, we could increase the frame rate in STM significantly. In the present study, we illustrate the implementation of spiral scan geometries and focus on the scanner input signal and the image visualization. Constant linear and constant angular velocity spirals were tested on the Ru(0001) surface to resolve chemisorbed atomic oxygen. The spatial resolution of the spiral scans is comparable to slow raster scans, while the imaging time was reduced from ~100 s to ~8 ms. Within 8 ms, oxygen diffusion processes were atomically resolved

A high-speed variable-temperature ultrahigh vacuum scanning tunneling microscope with spiral scan capabilities

We present the design and development of a variable-temperature high-speed scanning tunneling microscope (STM). The setup consists of a two-chamber ultra-high vacuum system, including a preparation and a main chamber. The preparation chamber is equipped with standard preparation tools for sample cleaning and film growth. The main chamber hosts the STM that is located within a continuous flow cryostat for counter-cooling during high-temperature measurements. The microscope body is compact, rigid, and highly symmetric to ensure vibrational stability and low thermal drift. We designed a hybrid scanner made of two independent tube piezos for slow and fast scanning, respectively. A commercial STM controller is used for slow scanning, while a high-speed Versa Module Eurocard bus system controls fast scanning. Here, we implement non-conventional spiral geometries for high-speed scanning, which consist of smooth sine and cosine signals created by an arbitrary waveform generator. The tip scans in a quasi-constant height mode, where the logarithm of the tunneling current signal can be regarded as roughly proportional to the surface topography. Scan control and data acquisition have been programmed in the experimental physics and industrial control system framework. With the spiral scans, we atomically resolved diffusion processes of oxygen atoms on the Ru(0001) surface and achieved a time resolution of 8.3 ms per frame at different temperatures. Variable-temperature measurements reveal an influence of the temperature on the oxygen diffusion rate

High-Speed Scanning Tunneling Microscopy on Thin Oxide Film Systems

Dünne Silizium- und Germaniumdioxidfilme auf Ru(0001)-Kristallen werden hinsichtlich dynamischer Prozesse untersucht. Zwischen Oxidfilm und Substrat befinden sich Sauerstoffatome, die eine ent-scheidende Rolle in diesen Systemen spielen. Zunächst werden diese Sauerstofflagen auf Ru(0001) mittels Hochgeschwindigkeits-Rastertunnelmikroskopie (STM) analysiert. Daraufhin wird die GeO2-Monolage auf Ru(0001) bei hohen Bildraten mit einer selbstentwickelten halbautomatischen Netz-werkdetektion untersucht. Schließlich wird die SiO2-Bilage auf Ru(0001) mit konventionellen sowie mit schnellen STM-Messungen bei Raumtemperatur und bei 600 K abgebildet. Um schnelle Messungen bei hohen Temperaturen zu realisieren, wird ein Hochgeschwindigkeits-STM konstruiert, welches bei unterschiedlichen Temperaturen betrieben werden kann. Unkon-ventionelle Spiralgeometrien ermöglichen verzerrungsfreie Bilder in weniger als 10 ms aufzunehmen. Die adsorbierten Sauerstofflagen werden erstmals bei hohen Bildraten untersucht. Die experimen-tellen Ergebnisse werden durch extern durchgeführte Dichtefunktionaltheorie-Berechnungen ergänzt. In den auf Ru(0001) bei Raumtemperatur stabilen Sauerstofflagen O(2×2), O(2×1) und 3O(2×2) werden dynamische Prozesse beobachtet. Die Besetzung des Zwischenzustandes entlang des Diffusionspfades und schnelle "Umklapp"-Prozesse eindimensionaler Linien werden auf atomarer Ebene aufgelöst. Komplexe Domänengrenzen in der GeO2-Monolage auf Ru(0001) werden mit Hochgeschwindigkeits-STM abgebildet. Die Messungen an der SiO2-Bilage auf Ru(0001) zeigen dynamische Änderungen des Abbildungskontrasts, die mit den mobilen Sauertsoffatomen an der Grenzfläche zusammenhängen können. Messungen bei hohen Temperaturen zeigen dynamische Kontraständerungen von mesoskopischen Strukturen. Diese Messungen stellen die ersten schnellen Hochtemperatur-STM-Aufnahmen des Siliziumdioxidfilms dar und bilden die Grundlage für künftige Studien zu dynamischen Veränderungen in dünnen Oxidschichtsystemen.Dynamics related to thin silicon- and germanium dioxide films that are grown on Ru(0001) crystals are investigated. Between the film and the metal support oxygen species are present that play a crucial role for these film systems. First, these oxygen adlayers on Ru(0001) are analyzed by high-speed scan-ning tunneling microscopy (STM) with the focus on dynamic processes. In a next step, the monolayer of germanium dioxide (germania) supported on Ru(0001) is studied at elevated frame rates and with a self-designed semi-automated network detection. Finally, the bilayer of silicon dioxide (silica) on Ru(0001) is studied by conventional and by high-speed STM both at room temperature and at 600 K. To realize fast STM measurements at elevated temperatures, a high-speed STM is designed that can operate at variable temperatures. Images are acquired in less than 10 ms with unconventional spiral scan patterns. The dynamics in oxygen adlayers are investigated for the first time at elevated frame rates. Experimental results are supported by density functional theory (DFT) calculations performed externally. Dynamic events are observed in the oxygen adlayers that are stable on Ru(0001) at room temperature, namely O(2×2), O(2×1), and 3O(2×2). The occupation of an intermediate state along the oxygen diffusion pathway and fast "flipping" events of atomic one-dimensional stripe patterns are observed. On the germania monolayer on Ru(0001), complex domain boundary structures are resolved with high-speed STM. In high-speed scans on the silica bilayer on Ru(0001), dynamic changes of the imaging contrast are observed that may relate to the mobile species in the oxygen interfacial layer. Measurements at elevated temperature reveal dynamic contrast changes of mesoscopic features. These measurements constitute the first high-speed STM scans on the silica film at elevated temperatures and form the basis for future studies with the focus on dynamic processes in thin oxide film systems

SSTAC/ARTS Review of the Draft Integrated Technology Plan (ITP). Volume 2: Propulsion Systems

The topics addressed are: (1) space propulsion technology program overview; (2) space propulsion technology program fact sheet; (3) low thrust propulsion; (4) advanced propulsion concepts; (5) high-thrust chemical propulsion; (6) cryogenic fluid management; (7) NASA CSTI earth-to-orbit propulsion; (8) advanced main combustion chamber program; (9) earth-to-orbit propulsion turbomachinery; (10) transportation technology; (11) space chemical engines technology; (12) nuclear propulsion; (13) spacecraft on-board propulsion; and (14) low-cost commercial transport

Security attacks and Analysis of Recent Intrusion Detection Schemes In Wireless Sensor Networks

Wireless sensor networks are currently the greatest innovation in the field of telecommunications. WSNs have a wide range of potential applications, including security and surveillance, control, actuation and maintenance of complex systems and fine-grain monitoring of indoor and outdoor environments. However security is one of the major aspects of Wireless sensor networks due to the resource limitations of sensor nodes. Those networks are facing several threats that affect their functioning and their life. In this paper we present security attacks in wireless sensor networks, and we focus on comparison and analysis of recent Intrusion Detection schemes in WSNs

National Science Foundation Advisory Committee for Cyberinfrastructure Task Force on Campus Bridging Final Report

The mission of the National Science Foundation (NSF) Advisory Committee on Cyberinfrastructure (ACCI) is to advise the NSF as a whole on matters related to vision and strategy regarding cyberinfrastructure (CI). In early 2009 the ACCI charged six task forces with making recommendations to the NSF in strategic areas of cyberinfrastructure: Campus Bridging; Cyberlearning and Workforce Development; Data and Visualization; Grand Challenges; High Performance Computing (HPC); and Software for Science and Engineering. Each task force was asked to offer advice on the basis of which the NSF would modify existing programs and create new programs. This document is the final, overall report of the Task Force on Campus Bridging.National Science Foundatio

Hostility or tolerance? Philosophy, polyphony and the novels of Thomas Pynchon

This thesis undertakes a systematic, tripartite analysis of the interactions between the fiction and essays of Thomas Pynchon and the philosophy of Ludwig Wittgenstein, Michel Foucault and Theodor W. Adorno, resulting in a solid set of original reference-material for those undertaking work on Pynchon and philosophy, or more generally on philosophico-literary intersections. Premised upon the notion that Pynchon's literature harbours a fundamental hostility to much systematizing philosophical thought, this work avoids a dominating imposition of philosophy, or an application of philosophical thought as a validating Other, by examining those aspects of Pynchon's work that seem ill at ease with, or aggressive towards, aspects of each philosopher's thought. This is explored through the concept of an intra-textual polyvocality and relational situation of philosophical intersection; when Wittgenstein is cited, for instance, who is speaking and what are the connotations of that placement? I do not propose, therefore, a Wittgensteinian / Foucauldian / Adornian Pynchon, but rather explicitly highlight excluded aspects of thought to instead develop a complementary reading; a form of intersubjective triangulation. This polyvocality is examined from a univocal perspective. The specific conclusions of this work re-situate Pynchon, in many cases against forty years of critical consensus, as a quasi-materialist or at least anti-idealist, a regulative utopist and a practitioner of an anti-synthetic style akin to Adorno's model of negative dialectics. In a broader sense, it answers the questions regarding hostility towards philosophical thought in Pynchon's work by demonstrating that no single philosophical standpoint has yet to totally resonate with even one of his novels. Simultaneously, it also shows that a profitable approach can be found in the spaces of philosophical overlap and divergence