196,605 research outputs found
QS-M-GROUT - Qualitätssicherung und Structural Health Monitoring von GROUT-Verbindungen an Unterwasser-Tragstrukturen von Offshore-Windenergieanlagen
No full textS.155-178Grout-Verbindungen, die bisher vorrangig in der Öl- und Gasindustrie in anderen bautechnischen Konstellationen verwendet wurden, führten in der Offshore-Windindustrie vor ca. zehn Jahren zu Problemen. Nach Untersuchungen von Schaumann et al., 2010 und anderen sind die Schäden vornehmlich auf dynamische Anregungen und dadurch verursachte Biegebelastungen zurückzuführen. Diese dynamische Belastung lockert die Verbindung zwischen Stahl und Beton, die ursprüngliche, auf Reibung beruhende Haftung geht verloren und die Rohre rutschen ineinander. Als dieses Problem des Durchrutschens erkannt wurde (Reuning 2010), wurden unterschiedliche Abhilfemaßnahmen von Schaumann und seinen Mitarbeitern (Schaumann et al. 2010) entwickelt. Sie reichen von Schubrippen bis zu konischen Rohren. Allerdings können diese Abhilfemaßnahmen erst bei Neubauten eingesetzt werden und die Praxistauglichkeit der Verbesserungen wird sich erst in einigen Jahren erweisen. Die gegenwärtig installierten Grout-Verbindungen müssen deshalb überwacht werden, und auch die Verbindungen mit den bereits erwähnten Abhilfemaßnahmen benötigen diese Überwachung, solange ihre Dauerfestigkeit bei Offshore Windenergieanlagen (OWEA) nicht in der Praxis zweifelsfrei nachgewiesen wurde. Die sichere Vermeidung von Schäden in der Betriebsphase ist über die Gefahrenabwehr hinaus auch von großem wirtschaftlichem Interesse. Neben den beschriebenen Dauerfestigkeitsproblemen gibt es mindestens ein weiteres gravierendes Problem bei Grouted Joints. Die Verbindungen werden unter sehr schwierigen Umgebungsbedingungen (Seegang, Wind, Arbeite n im bzw. unter Wasser) hergestellt und die volle Tragfähigkeit wird erst nach einer gewissen Zeit erreicht. Der Herstellungsprozess kann nur unzureichend visuell und durch den sogenannten Überlauf oder durch den an gelegten Verpressdruck kontrolliert werden. Das heißt, es wird mehr Spezialbeton eingefüllt, als das Volumen zwischen Pile und Sleeve fassen kann. Probleme mit der Abdichtung des Verfüllvolumens können so nicht erkannt werden (vgl. dazu Lohaus 2013 et al.). Aus den genannten Gründen war die notwendige und vorgeschriebene Überwachung von Grout-Verbindungen für die Betreiber von Offshore-Windparks ein ungelöstes Problem. Wir sind überzeugt, dass QS-M Grout Wege zu einer kontinuierlichen Überwachung von Grout-Fugen eröffnet
On the road with Wellington : the diary of a war commissary in the peninsular campaigns / by August Ludolf Friedrich Schaumann ; edited and translated By Anthony M. Ludovici.
No full textEx libris: Francis James RidsdaleTel
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Data from: Fractionation of copper and uranium in organic and conventional vineyard soils and adjacent stream sediments studied by sequential extraction
No full textThis collection contains data and R code to reproduce the findings published in the following article:
Steinmetz Z, Kenngott KGJ, Azeroual M, Schäfer RB, Schaumann GE (2017) Fractionation of copper and uranium in organic and conventional vineyard soils and adjacent stream sediments studied by sequential extraction. J Soils Sediments. doi: 10.1007/s11368-016-1623-yFor further details, please read the README file.<br
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Multi-Agent Modelling and Simulation of Hospital Acquired Infection Propagation Dynamics by Contact Transmission in Hospital Wards
No full textHospital-acquired infections (HAI) are recognized worldwide as a major threat to hospital users. In this study, we present the Multi-Agent modelling and simulation of HAI propagation dynamics through exogenous cross-infection by a contact transmission route in a hospital ward. The model relies on the Event Based Modelling and Simulation approach. It is meant to deal with a wide range of pathogen types and scenarios of their spread within a hospital environment, which can be extended to integrate relevant emerging factors in the dynamic evolution of HAIs. The Agent-Based application was validated through a virtual simulation of a case study built in a Unity 3D environment, which generates a real time infection risk map. The simulation represents the building and its users in the situation of HAI risk in a coherent and dynamic system. It allows for the visualization of contamination propagation due to human spatial behaviour and activities. The case study was tested through a what-if scenario, allowing for the real-time visualization of transmission and assessing the effectiveness of different prevention and control measures on pathogen propagation. Of further interest was an understanding of the influences of architectural design and space distribution
A Multi-Agent Simulator for Infection Spread in a Healthcare Environment
No full textA Multi-Agent simulator made in Unity 3D is proposed to track the spread of Hospital Acquired Infections transmitted by contact in hospital wards. The tool generates a real-time contamination risk map for both people and spaces, depending on the profile, behavior and activities of virtual agents, the characteristics of pathogens and the role of inanimate objects and places
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
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