Memory and spectacle at Potsdamer Platz : an architectural geography of Berlin's new centre

This thesis looks at the landscape of Potsdamer Platz, a hub of commercial and leisure activity in contemporary Berlin, Germany. Once the thriving center of the city, this site was largely destroyed during World War II and, in 1961, enclosed between the two parts of the Berlin Wall. Potsdamer Platz remained a "no man's land" until the fall of the Wall in 1989, when it once again became a desirable site for development. The following years saw this area become Europe's largest construction site as a new city centre was created. Today's Potsdamer Platz consists of flashy corporate architecture and privatized "public" space, emphasizing the importance of capital and consumption, while signs of a distinctly German identity are muted in an attempt to break with the city's troubled past. This is consistent with attempts to increase Berlin's prominence as a major city in Europe and an urban area of global importance. Potsdamer Platz represents a vision of the city's future and thus illuminates debates about the representation of the past. Further consideration of the site's reception indicates that this past is understood in different and interesting ways and is constantly being negotiated as Berlin continues to change.Arts, Faculty ofGeography, Department ofGraduat

The Citizen as an Engineer

Commencement address given by William Thomas Magruder, Professor of Mechanical Engineering, to the Autumn 1925 graduating class of The Ohio State University, University Hall Chapel, Columbus, Ohio, December 23, 1925

A Report on the Reduction of Sphalerite under Reduced Pressure

During the last war, with the increased demand for magnesium metal and the general disregard for costs, a number of plants were constructed for the production of magnesium by vacuum metallurgical methods. (Both the Carbothermic Process and the Pidgeon Ferrosilicon Process employ vacuum systems for the production of metallic Mg.) At the close of the war several of the government built plants were forced to suspend operations because of the economic impossibility of producing magnesium in competition with the Dow Chemical Company. It was with the availability of these plants in mind that experimentation with the possibilities of producing metallic Zn (from a sphalerite concentrate) under reduced pressure was undertaken. The retorts used in the Pidgeon Process are of a high chrome, high nickel steel ( 28Cr, l5Ni, 1.5Si, 1.25Mn, and .3C) and the process involves runs of approximately 9 1/2 hours at a temperature of about 1150⁰C and a pressure ranging from 1000 microns (Hg) at the start of the process to 45 microns at the conclusion. The equipment used in this experiment produces conditions that closely approximate those obtainable with the equipment used for the Pidgeon Process. Although many runs were made at pressures lower than those obtained industrially it is believed that, except for a slight increase in yield at reduced pressures, the results obtained at a pressure of 1 micron are substantially the same as those that would be obtained at a pressure of 500 microns or even higher”--Introduction, pages 2-3

The Interference Of Elemental Sulfur In The Determination Of Trace Organics In Drinking Water By The Carbon Adsorption Method

Carbon chloroform extract and related blank materials obtained by the Organics-Carbon Adsorbable modification of the Carbon Adsorption Method have been found to contain a significant amount of elemental sulfur ranging from 17 to 58%. Carbon preparation affected the blank value determined; chloroform elution of prewetted carbon yielded higher values than extraction of as received carbon. Copyright © 1976, Taylor & Francis Group, LL