• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 527
  • 119
  • 70
  • 61
  • 54
  • 35
  • 35
  • 35
  • 35
  • 35
  • 35
  • 15
  • 9
  • 8
  • 7
  • Tagged with
  • 1085
  • 1085
  • 430
  • 368
  • 205
  • 172
  • 93
  • 84
  • 83
  • 76
  • 73
  • 73
  • 71
  • 68
  • 67
  • 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.
51

Quantitative condition monitoring of lubricating oils by Fourier transform infrared (FTIR) spectroscopy

Dong, Jun, 1971- January 2000 (has links)
Three new quantitative Fourier transform infrared (FTIR) spectroscopic methods were developed to measure key lubricant condition monitoring parameters; total acid number (TAN), total base number (TBN), and moisture (H2O). All methods employ a common sample-handling accessory and are based on the addition of specific reagents designed to react stoichiometrically with target species in oils, with quantification being carried out using differential FTIR spectroscopy. The combined use of a stoichiometric reaction and differential spectroscopy overcomes the need for a reference oil, which has traditionally hindered quantitative analysis of lubricants by FTIR spectroscopy. Potassium hydroxide, trifluoroacetic acid (TFA) and 2,2-dimethoxypropane (DMP) were the stoichiometric reagents used to develop the FTIR TAN, TBN and H2 O methods, respectively. Calibrations were developed using either peak height measurements or partial least squares (PLS) regression and the methods were validated using standard addition techniques, as the ASTM (American Society of Testing and Materials) standard methods were not sufficiently reproducible to make valid comparisons. Validation of the methods indicated that the TAN, TBN and H2O methods had accuracies of +/-0.095 mg KOH/g, +/-0.5 mg KOH/g and +/-32ppm respectively and corresponding reproducibilities of +/-0.05 mg KOH/g, +/-0.17 mg KOH/g and +/-22 ppm. The TAN, TBN and H2O methods were implemented on a Continuous Oil Analysis and Treatment (COATRTM) System, integrating instrumentation, software and sample handling so as to provide packaged, user and environmentally friendly analytical methods that are alternatives to conventional ASTM wet chemical methods.
52

Study of chemically modified non-starch polysaccharides

Yuen, Sze-nga. January 2007 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2008. / Also available in print.
53

Fourier transform infrared isotopic studies on novel metal-carbon clusters trapped in Ar matrix environments

Bates, Sarah Anne. January 2008 (has links) (PDF)
Thesis (Ph.D.)--Texas Christian University, 2008. / Title from dissertation title page (viewed May 7, 2008). Includes abstract. Includes bibliographical references.
54

Infrared studies on solid hydrogen, deuterium and hydrogen-deuteride using Fourier-transform spectroscopy /

Lee, Sang Young, January 1900 (has links)
Thesis (Ph. D.)--Ohio State University, 1987. / Includes vita. Includes bibliographical references (leaves 208-211). Available online via OhioLINK's ETD Center.
55

Detection of frequency-hopped signals embedded in non-stationary interference

Layfield, Steven C. January 2008 (has links) (PDF)
Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, December 2008. / Thesis Advisor(s): Robertson, R. Clark. "December 2008." Description based on title screen as viewed on January 29, 2009. Includes bibliographical references (p. 35). Also available in print.
56

Aspects of Fourier imaging : a thesis presented for the degree of Doctor of Philosophy, University of Canterbury, Christchurch, New Zealand /

Hsiao, Wen-Hsin. January 1900 (has links)
Thesis (Ph. D.)--University of Canterbury, 2008. / Typescript (photocopy). "May 2008." Includes bibliographical references (p. 157-165). Also available via the World Wide Web.
57

Comparison of the mid-frequency line edge noise algorithms of Jim Hamerly and Yigal Gur for best correlation to the psychophysical defect known as raggedness /

Huff, Kevin G. January 1987 (has links)
Thesis (M.S.)--Rochester Institute of Technology, 1987. / Typescript. Includes bibliographical references (leaf 15).
58

Solid-state plasticizers for melt extrusion /

Desai, Dipen. January 2007 (has links)
Thesis (Ph.D.) -- University of Rhode Island, 2007 / Typescript. Includes bibliographical references (leaves 178-184).
59

Fourier transform infrared spectroscopic measurement of carbon monoxide and nitric oxide in sidestream cigarette smoke in real time using a hollow waveguide gas cell and nonimaging optics

Thompson, Bruce Thomas. January 2004 (has links) (PDF)
Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2005. Directed by Boris Mizaikoff. / Hunt, William, Committee Member ; Weck, Marcus, Committee Member ; Mizaikoff, Boris, Committee Chair ; Janata, Jiri, Committee Member ; Orlando, Thomas, Committee Member. Includes bibliographical references.
60

A fourier transform infrared spectroscopy study of hydrogen interaction with metal-organic-frameworks.

Mayer, Daniel A. January 2007 (has links)
Thesis (M.S.)--Rutgers University, 2007. / "Graduate Program in Physics and Astronomy." Includes bibliographical references (p. 81-83).

Page generated in 0.0631 seconds