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Articles 1 - 8 of 8
Full-Text Articles in Physical Sciences and Mathematics
Modeling Vibration Stiffness: An Analytical Extension Of Hertzian Theory For Angular Contact Bearings With A Thin Viscoelastic Coating, Davis R. Burton
Modeling Vibration Stiffness: An Analytical Extension Of Hertzian Theory For Angular Contact Bearings With A Thin Viscoelastic Coating, Davis R. Burton
Honors Theses
This thesis considers the novel angular contact rolling-element bearings proposed by NASA’s Glenn Research Center, which are coated with a thin solid lubricant that exhibits viscoelastic behavior. Current analytical models for the dynamic stiffness matrix of angular contact bearings, critical for vibration analysis, lack the ability to model the effects of a solid coating, as well as the time dependencies inherent in viscoelastic theory. The author first presents an overview of the stiffness matrix derivation, followed by a treatment of the underlying Hertzian contact theory. An analytical extension of this theory is proposed which accounts for a thin elastic layer …
Synthesis And Characterization Of Silver(I) And Manganese(Ii) Complexes With Thione Imidazoles, Shannon Keyser, Audrey Lawrence, Jaime M. Murphy Ph.D.
Synthesis And Characterization Of Silver(I) And Manganese(Ii) Complexes With Thione Imidazoles, Shannon Keyser, Audrey Lawrence, Jaime M. Murphy Ph.D.
Honors Theses
Coordination polymers are chemical complexes with versatile applications such as catalysts, electrical conduc-tors, non-linear optics, magnetics, chemical sensing, and molecular storage. The polymers are comprised of a repeating series of metal-ligand complexes, which form various structures in varying ratios depending on the metal and ligand used. Certain metal-ligand combinations have shown particular promise as potentially being polymers or, if not polymers, possessing other useful features such as electromagnetic conductivity. Complexes were synthesized using silver(I) and manganese(II) with the ligands methimazole, 2-mercaptoimidazole, and thiocarbanilide with counterions of either chloride or nitrate. These com-plexes were characterized using elemental analysis, infrared spectroscopy, and …
Synthesis And Characterization Of Silver Thione Complexes, Audrey V. Lawrence
Synthesis And Characterization Of Silver Thione Complexes, Audrey V. Lawrence
Honors Theses
Coordination polymers are repeating units of a coordination complex that have applications as catalysts, conductors, and magnets. In this work, silver (I) was the metal of choice because it behaves similarly to copper (I), which has been studied much more extensively and thione ligands were chosen due to their potential for forming coordination polymers. These coordination complexes with silver were synthesized by combining silver nitrate with thioacetamide, N,N'-diphenylthiourea, and 2-mercapto-1-methylimidazole. These complexes were characterized via IR spectroscopy, elemental analysis, and X-ray crystallography. Silver thioacetamide was determined to form a coordination complex through the sulfur to form a trigonal crystal lattice …
Atmospheric Radiation And Tgfs: Unexplained Radiation In Our Skies, Adrian Gallegos
Atmospheric Radiation And Tgfs: Unexplained Radiation In Our Skies, Adrian Gallegos
Honors College Research
There is a significant correlation between atmospheric electrification via thunderstorms and the occurrence of large emissions of x-ray and gamma ray radiation known as Terrestrial Gamma Ray Flashes (TGFs). Some physical phenomenon may be explained by either the RREA or Thermal Runaway models, but the scientific community as a whole is still largely at work on the theoretical frameworks.
Tools For Discovering And Archiving The Mobile Web, Frank Mccown Ph.D., Monica Yarbrough, Keith Enlow
Tools For Discovering And Archiving The Mobile Web, Frank Mccown Ph.D., Monica Yarbrough, Keith Enlow
Computer Science Faculty Research and Publications
Many websites are adapting their content for users who are accessing the Web using smartphones and tablets. The growth of this Mobile Web has required web archivists to change their practices in order to collect this ephemeral web content. We have created a tool called MobileFinder which can be used to automatically detect mobile pages when given the URL of a desktop web page. We used this tool in an experiment to gauge what techniques popular websites are currently using to expose mobile content, and we incorporated the tool into Heritrix to demonstrate its usefulness to the web archiving community.
Implementing Time Travel For The Web, Robert Sanderson, Harihar Shankar, Scott Ainsworth, Frank Mccown Ph.D., Sam Adams
Implementing Time Travel For The Web, Robert Sanderson, Harihar Shankar, Scott Ainsworth, Frank Mccown Ph.D., Sam Adams
Computer Science Faculty Research and Publications
This article discusses the challenges and solutions discovered for implementing the Memento protocol in a variety of browser environments. It describes the design and deployment of the client technologies which have been developed: a web application that functioned as a browser, an add-on for FireFox called MementoFox, a plugin for Internet Explorer and an Android-based client application. The design and technical solutions identified during the development will be of interest to those considering implementation of a Memento based platform, especially on the client side, however the interactions are also important for building conformant server-side systems.
Report On The First International Workshop On Innovation In Digital Preservation (Indp 2009), Frank Mccown Ph.D., Hannes Kulovits, Andreas Rauber
Report On The First International Workshop On Innovation In Digital Preservation (Indp 2009), Frank Mccown Ph.D., Hannes Kulovits, Andreas Rauber
Computer Science Faculty Research and Publications
Information about several topics discussed at the First International Workshop on Innovation in Digital Preservation (InDP 2009) on June 19, 2009 in Austin, Texas is presented. Topics include the collection of digital objects, web pages transition, and digital preservation (DP). The workshop featured presenters Rudolf Mayer, Martin Klein and Dominick Heutelbeck.
Observed Web Robot Behavior On Decaying Web Subsites, Joan A. Smith, Frank Mccown Ph.D., Michael L. Nelson
Observed Web Robot Behavior On Decaying Web Subsites, Joan A. Smith, Frank Mccown Ph.D., Michael L. Nelson
Computer Science Faculty Research and Publications
We describe the observed crawling patterns of various search engines (including Google, Yahoo and MSN) as they traverse a series of web subsites whose contents decay at predetermined rates. We plot the progress of the crawlers through the subsites, and their behaviors regarding the various file types included in the web subsites. We chose decaying subsites because we were originally interested in tracking the implication of using search engine caches for digital preservation. However, some of the crawling behaviors themselves proved to be interesting and have implications on using a search engine as an interface to a digital library.