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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
71

The fabrication of specialized probes for surface metrology

Williams, Ryan Donald, 1981- 29 August 2008 (has links)
This dissertation will demonstrate the synergy of nanoscopic materials and surface metrology methods by the fabrication and implementation of CNT atomic force microscopy (AFM) tips, CNT scanning tunneling microscopy (STM) tips, Pt spike AFM tips, and Pt spike near-field scanning optical microscopy (NSOM) tips for the methods of critical dimension metrology, STM, AFM phase imaging, scanning surface potential AFM (SSPM), NSOM, and three-dimensional AFM. Chapter 1 provides a general overview of the information that will be discussed in this dissertation. Chapter 2 describes two methods for the simultaneous fabrication of carbon nanotube atomic force microscopy and scanning tunneling microscopy probes. The fabrication of these high resolution probes, as well as their imaging characteristics, is described in detail. Resolution standards were used to characterize their behavior and resolution limits. In Chapter 3, the effect of high aspect ratio probe length on AFM phase imaging is studied by fabricating highly controllable Pt spike AFM tips. By monitoring phase shifts on homogenous surfaces as a function of Pt spike length, it is shown that attractive forces at the tip are significantly reduced when high aspect ratio structures are added to conventional AFM probes. In Chapter 4, the effect of probe geometry on scanning surface potential microscopy (SSPM) is described. By studying the effect of scan height in SSPM, it was found that large surface area probe geometries, such as conventional Pt coated AFM tips, have lower surface potential resolution because of contributions from the sides of the tip as well as the cantilever. Spatial resolution standards were probed to evaluate the effect of probe geometry on SSPM sensitivity and resolution. Chapter 5 describes the fabrication of specialized probes for three-dimensional atomic force microscopy, scanning near-field optical microscopy, and scanning electrochemical -- atomic force microscopy (SECM-AFM). Using techniques described in Chapters 2-4, high aspect ratio structures were added to conventional probes used in 3D AFM, NSOM and SECM-AFM to solve limitations inherent to current probe designs for each method. Preliminary data indicates that each probe will have a significant beneficial effect on the resolution limit of its technique.
72

A new scalable parallel finite element approach for contact-impact problems

Har, Jason 05 1900 (has links)
No description available.
73

The fabrication of specialized probes for surface metrology

Williams, Ryan Donald, January 1900 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2007. / Vita. Includes bibliographical references.
74

Implementation of one surface fitting algorithm for randomly scattered scanning data

Guo, Xi. January 2000 (has links)
Thesis (M.S.)--Ohio University, August, 2000. / Title from PDF t.p.
75

Measurement of the Young's modulus of hexoloy silicon carbide thin films using nanoindentation

Crocker, Janina. January 1900 (has links)
Thesis (M.Eng.). / Written for the Dept. of Mechanical Engineering. Title from title page of PDF (viewed 2008/01/14). Includes bibliographical references.
76

Soldering in magnesium high pressure die casting and its preservation by surface engineering

Tang, Caixian. January 2007 (has links)
Thesis (PhD) - Swinburne University of Technology, Industrial Research Institute Swinburne - 2007. / [A thesis submitted] for the degree of Doctor of Philosophy, Industrial Research Institute, Swinburne University of Technology - 2007. Typescript. Includes bibliographical references (p. 154-167).
77

A study on wear and surface roughness of work roll in cold rolling

Li, Hongchun. January 2008 (has links)
Thesis (Ph.D.)--University of Wollongong, 2008. / Typescript. Includes bibliographical references: leaf 166-180.
78

An analysis of decomposition rates on outdoor surface variations in central Texas /

Shattuck, Carly M., January 1900 (has links)
Thesis (M.A.)--Texas State University--San Marcos, 2009. / Vita. Appendices: leaves 40-61. Includes bibliographical references (leaves 62-66). Also available on microfilm.
79

Stress analysis of anisotropic plates containing rectangular cuts /

Asmar, Ghazi H. January 1998 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 1998. / Typescript. Vita. Includes bibliographical references (leaves 162-166). Also available on the Internet.
80

Stress analysis of anisotropic plates containing rectangular cuts

Asmar, Ghazi H. January 1998 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 1998. / Typescript. Vita. Includes bibliographical references (leaves 162-166). Also available on the Internet.

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