Excursion

12:24, 26, 27. She slid open the bottom drawer of her politely-black metal desk and carefully extracted a crumpled, brown sack. She kicked the drawer closed, masking the bag\u27s betraying crinkle with the slam. Now a quick survey of the three long corridors extending from the reception area: clear. She swiveled out of her modestly-gold swivel chair and took 17 rapid steps down one of the corridors, to the room plaqued WOMEN..

Investigation of smooth specimen scc test procedures; variations in environment, specimen size, stressing frame, and stress state

The variables studied in the stress-corrosion cracking performance of high strength aluminum alloys were: (1) corrosiveness of the environment, (2) specimen size and stiffness of the stressing system, (3) interpretation of transgranular cracking, and (4) interaction of the state of stress and specimen orientation in a product with an anisotropic grain structure. It was shown that the probability of failure and time to fracture for a specimen loaded in direct tension are influenced by corrosion pattern, the stressing assembly stiffness, and the notch tensile strength of the alloy. Results demonstrate that the combination of a normal tension stress and a shear stress acting on the plane of maximum susceptibility in a product with a highly directional grain cause the greatest tendency for stress-corrosion cracking

Sonochemische Transformation von sauerstoffhaltigen Kraftstoffadditiven unter aquatischen Bedingungen

Sauerstoffhaltige Kraftstoffadditive (z.B. Methyl-tert-Butylether) wurden zur langfristigen Verbesserung der Luftqualität eingeführt. Allerdings sind in der Folgezeit besonders in der Umgebung von Tanklagern erhöhte MTBE-Konzentrationen im Grundwasser nachgewiesen wurden. Ein relativ neuer Verfahrensansatz zum Schadstoffabbau im Wasser ist der Einsatz von Ultraschall, die so genannte Aquasonolyse. In dieser Arbeit wurde die Aquasonolyse von Methyl-tert-Butylether, Ethyl-tert-Butylether und tert-Amylmethylether untersucht. Besonderes Interesse galt dabei den verschiedenen geräte- bzw. substanzspezifischen Einfluss-Parametern, wie z.B. Frequenz, Leistung, Konzentration, Zusatzstoffe

Analyzing high energy physics data using database computing: Preliminary report

A proof of concept system is described for analyzing high energy physics (HEP) data using data base computing. The system is designed to scale up to the size required for HEP experiments at the Superconducting SuperCollider (SSC) lab. These experiments will require collecting and analyzing approximately 10 to 100 million 'events' per year during proton colliding beam collisions. Each 'event' consists of a set of vectors with a total length of approx. one megabyte. This represents an increase of approx. 2 to 3 orders of magnitude in the amount of data accumulated by present HEP experiments. The system is called the HEPDBC System (High Energy Physics Database Computing System). At present, the Mark 0 HEPDBC System is completed, and can produce analysis of HEP experimental data approx. an order of magnitude faster than current production software on data sets of approx. 1 GB. The Mark 1 HEPDBC System is currently undergoing testing and is designed to analyze data sets 10 to 100 times larger

XSEDE Campus Bridging – Cluster software distribution strategy and tactics

This document is both a public document and an internal working document intended to define XSEDE strategies related to XSEDE’s cluster build software distribution project. This is part a strategy document, part tactical.XSEDE is supported by National Science Foundation Grant 1053575 (XSEDE: eXtreme Science and Engineering Discovery Environment)

Return on Investment from Academic Supercomputing: SC14 Panel

Return on Investment or ROI is a fundamental measure of effectiveness in business. It has been applied broadly across industries, including information technology and supercomputing. In this panel, we will share approaches to assessing ROI for academic supercomputing.The panel will address the challenge that “returns” from supercomputing and other computationally based research activities are often not financial. This is major distinction from other industrial sectors, where product sales, inventions, and patents might form the basis of ROI calculations. How should ROI be assessed for high performance computing in academic environments? What inroads to ROI calculations are underway by the panelists? What are challenges of ROI calculations

OLED Encapsulation by Room Temperature Plasma-Assisted ALD Al2O3 Films

Organic light emitting diodes (OLEDs, both small molecule and polymer LEDs) require excellent gas and moisture permeation barrier layers to increase their lifetime. The quality of the barrier layer is ultimately controlled by the presence of defects in the layer. Although a barrier layer may be intrinsically excellent (water vapor transmission rate, WVTR = 10-6 g·m-2·day-1) the protected device may fail in the presence of defects that lead to preferential diffusion pathways for H2O (e.g., defects caused by particles from the environment and/or production process). The state-of-the-art barrier coatings are micrometer-thick multi-layer structure, in which organic interlayers are alternated with inorganic barrier layers with the purpose of decoupling the above-mentioned defects. Recently, atomic layer deposition (ALD) has been successfully tested for the deposition of very thin (<50 nm) single layer permeation barriers on pristine polymer substrates [1,2], showing the potential of this highly uniform and conformal deposition technique in the field of moisture permeation barriers. In this contribution the encapsulation of OLEDs by plasma-assisted ALD of thin (20-40 nm) Al2O3 layers is addressed. The layers are synthesized at room temperature by sequentially exposing the substrate to Al(CH3)3 vapor and a remote inductively coupled O2 plasma in Oxford Instruments FlexALTM and OpALTM reactors. The intrinsic quality of the deposited ALD layers was determined by monitoring the oxidation of a Ca film encapsulated by the Al2O3 film: WVTR values as low as 2·10-6 g·m-2·day-1 have been measured. The potential of ALD layers in encapsulating OLEDs, and therefore in successfully covering the defects present on the device, has been investigated by means of electroluminescence measurements of polymer-LEDs (effective emitting area of 5.8 cm2). The black spot density and area growth were followed as a function of the time under standard conditions of 20°C and 50% relative humidity. Within a 500 h test ALD-encapsulated OLEDs show approximately half the black spot density compared to devices encapsulated by plasma deposited a-SiNx:H (300 nm thick). The black spot density is further reduced by combining the a-SiNx:H and ALD Al2O3 layers. These results point towards a very promising application of ALD Al2O3 layers in the field of OLED encapsulation and will be interpreted in terms of possible mechanisms related to film growth in multi-layer structures