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Filtering by: Creator Cockfield, Stephen D. Remove constraint Creator: Cockfield, Stephen D. Degree Field Chemistry Remove constraint Degree Field: Chemistry

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  • Some recent developments in the theory of significant figures and their applications to chemical instrumentation

    Creator:
    Fields, Lawrence D.
    Abstract:
    Significant figures have been a nebulous area in the physical sciences. The results of a literature survey, and of a questionaire distributed among the Chemistry Department faculty at Oregon State University, revealed widely differing interpretations regarding the proper role of significant figures. The present study has a two-fold nature. First...
    Resource Type:
    Masters Thesis
    Full Text:
    figures and their applications to chemical instrumentation AN ABSTRACT OF THE THESIS OF Lawrence D

  • Synthesis and oligomerization of y,4-Diamino-2-oxo-1(2H)-pyrimidinepentanoic acid

    Creator:
    Nelson, Jeffrey Stephen
    Abstract:
    Described herein is the synthesis of an uncharged stereoregular oligonucleotide analog consisting of cytosine bases linked at specific intervals to a polyamide backbone derived from (L)-glutamic acid. Preparation of this analog entailed borane reduction of (L)- pyroglutamic acid to give optically pure lactam alcohol 9. Tosylation and alkylation with cytosine...
    Resource Type:
    Masters Thesis
    Full Text:
    )- pyrimidinepentanoic Acid Redacted for privacy Abstract approved: Dwight D. Weller Described herein is the synthesis

  • The use of stable activable tracer in hydrology

    Creator:
    Chick, Stephen W. K.
    Abstract:
    A tracer method utilizing stable activable tracers (involving rare earth nuclides with short-lived t[subscript 1/2] < 1 day} activation products) for tracing fluid bound substances in fresh water is explored. Simulated laboratory studies showed these tracers (Dy and in) when chelated with diethylenetriamine2entaacetic acid a7i1W to be stable ( <20%)...
    Resource Type:
    Masters Thesis
    Full Text:
    ABSTRACT OF THE THESIS OF STEPHEN W.K.CHICK. IN ( !WE OF STUDENT ) CHEMISTRY TAJOR F M. S FOR THE

  • Solid-phase synthesis and biophysical testing of uncharged acyclic oligonucleotide analogues

    Creator:
    Nelson, Jeffrey Stephen, 1962-
    Resource Type:
    Dissertation
    Full Text:
    and Biophysical Testing of Uncharged Acyclic Oligonucleotide Analogues. Abstract approved: Dwight D

  • The diffusion coefficient of propane in helium

    Creator:
    Tang, Fa-tai
    Abstract:
    A specially designed gas chromatograph with both TCD and FID has been tested for the measurement of the diffusion coefficients of methane and propane in helium. Knox's arrested elution technique(⁴) was used and yielded a value of 0.6431 cm²/sec averaged with the value obtained by Yang and Hawkes(⁷). Values of...
    Resource Type:
    Masters Thesis
    Full Text:
    : Redacted for Privacy Dr. Stephen J. Hawkes A specially designed gas chromatograph with both TCD and FID

  • The obstructive factor in gas chromatography

    Creator:
    Thumneum, Pornpan
    Abstract:
    The study of the obstructive factor by Hawkes (11) showed a relation between the obstructive factor and velocity using a continuous method. Later, Bowers and Hawkes (12) developed a similar method with some improvements in the apparatus and found out that the obstructive factor was not flow dependent. This study...
    Resource Type:
    Masters Thesis
    Full Text:
    : Redacted for Privacy J (Dr. Stephen J. Hawkes) The study of the obstructive factor by Hawkes (11) showed

  • Diffusion in silicone polymers

    Creator:
    Kong, Ming J.
    Abstract:
    The study of diffusion coefficients of n-alkanes and other organic compounds in silicones is undertaken by gas-liquid chromatography. About 0. 3% of stationary phase is coated on glass bead support so that the only significant source of peak spreading is due to slow liquid phase mass transfer. Diffusion coefficients are...
    Resource Type:
    Masters Thesis
    Full Text:
    ) (date) Title: DIFFUSION IN SILICONE POLYMERS Abstract approved: Redacted for privacy Stephen J

  • Diffusion of n-alkanes in polydimethylsilicones

    Creator:
    Millen, William George
    Abstract:
    Diffusion of short chain n-alkanes was found to be faster in the polydimethylsilicone elastomer SE-30 than in the polydimethylsilicone oil SF-96-2000. The opposite was true for the longer chain n-alkanes suggesting that choice of stationary phase for gas chromatography would depend on the chain length of sample components. The dependence...
    Resource Type:
    Masters Thesis
    Full Text:
    (ANALYTICAL) presented on I D -ec 111 Title: DIFFUSION OF N-ALKANES IN POLYDIMETHYLSILICONES Redacted for

  • Fast gas chromotography

    Creator:
    Dandeneau, Raymond Dale
    Resource Type:
    Dissertation
    Full Text:
    were found to increase in proportion to d -1/2 for decreasing d with column length held constant

  • Slow processes in gas-solid chromatography

    Creator:
    Burns, Walter Frederick
    Abstract:
    Gas-solid chromatography often has asymmetrical elution peaks. This is attributed to nonlinear isotherms, multi-energy adsorption sites, and slow processes. This study utilized a stopflow gas chromatograph with various NaOH and NaCl modified aluminas as adsorbents and methane as adsorbate to determine the influence of surface area and pore volume distribution...
    Resource Type:
    Masters Thesis
    Full Text:
    CHROMATOGRAPHY Abstract approved: Redacted for Privacy Stephen J. Hawkes Gas-solid chromatography often has