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Fine structure in d - f and f - f transitions of Tm3+ and systematic investigation of 3d5-3d44s absorption of Mn2+ doped fluoridesTrue, Marcus. January 2004 (has links) (PDF)
Hamburg, University, Diss., 2004.
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Ab-initio-Rechnungen und temperaturabhängige Neutronenstreuung an FluoridkristallenSchmalzl, Karin. January 2004 (has links) (PDF)
Regensburg, Universiẗat, Diss., 2004.
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Further studies of boron monohalide and polyboron halide chemistryPardoe, Jennifer Ann Jean January 2001 (has links)
No description available.
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Characterization of double walled carbon nanotubes-polyvinylidene fluoride nanocompositesAlmasri, Atheer Mohammad 25 April 2007 (has links)
One of the main objectives of this thesis is to disperse double-walled carbon
nanotubes (DWNT) in a polyvinylidene fluoride (PVDF) matrix, and to characterize the
resulting composite using electrical, thermal, and mechanical characterization techniques.
DWNTs are successfully dispersed in the PVDF, and this dispersion is assessed by using
optical microscopy and both scanning and transmission electron microscopy.
The second objective of this study is to investigate the morphology of the PVDF after
adding the carbon nanotubes. The results using the x-ray diffraction technique do not
show change in the PVDF morphology with addition of DWNTs. In Differential scanning
calorimetry study the results show that the melting temperature does not vary much with
addition of DWNTs. An increase in the crystallization temperature and a decrease in the
percent crystallinity is also observed as DWNT content increases.
The electrical and mechanical properties of the composites are measured and data is
used to calculate the percolation volume fraction using electrical conductivity. The results
show that the percolation threshold occurs at 0.23 vol%, which is a low volume fraction
further indicating a good dispersion. The critical exponent implies a three dimensional
dispersion. The predicted volume fraction at percolation using the excluded volume approach indicates that the DWNTs are dispersed in small bundles of seven hexagonally
closed packed tubes. The mechanical properties are done using dynamic mechanical
analysis to study the effect of the nanotubes on the mechanical properties. The results
show that the storage modulus is enhanced 84% by adding 4.51 vol% DWNT-PVDF
below the glass transition temperature which is in a -45ðC region and it is increased by
about 97% at 40ðC.
Electromechanical performance of the composites is assessed by testing the actuation
behavior using DC voltage. The results show no actuation for volume contents below
percolation, and a measurable actuation at volume contents above percolation.
Results from the different characterization techniques indicate that the DWNTs are
successfully dispersed. An enhancement in electrical conductivity and dielectric constant
is achieved by addition of DWNTs. At DWNT volume content above percolation, both
mechanical and electromechanical enhancements are observed, as evidenced by DMA
and electroactive characterization techniques.
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Infrared optical properties of LiF as a function of temperatureKachare, Akaram H January 1972 (has links)
Typescript. / Thesis (Ph. D.)--University of Hawaii at Manoa, 1972. / Bibliography: leaves 213-218. / xiv, 218 l illus., tables
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Thermodynamic modeling of aqueous hydrogen fluoride mixtures : a dissertation presented to the faculty of the Graduate School, Tennessee Technological University /Baburao, Barath, January 2007 (has links)
Thesis (Ph.D.)--Tennessee Technological University, 2007. / Bibliography: leaves 182-193.
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The infrared dispersion of hydrogen fluorideWickliffe, Morris E., January 1976 (has links)
Thesis--Wisconsin. / Vita. Includes bibliographical references (leaves 44-45).
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Synthese und Strukturaufklärung von Tetrafluoroauraten (III) sowie Untersuchungen der Systeme TlF, PdF2, MF3 und MF6n- mit n = 1,2Fitz, Heiko. January 2001 (has links)
Giessen, Universiẗat, Diss., 2001. / Dateiformat: tar.gz, Dateien im PDF-Format.
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Studies on the Dietary Intake of Fluoride and the Concentration of Fluoride in Urine Over the Course of PregnancyCastiblanco Rubio, Gina Alejandra 06 1900 (has links)
Indiana University-Purdue University Indianapolis (IUPUI) / The use of maternal urinary fluoride as a biomarker of prenatal fluoride exposure in epidemiology studies is increasing. However, the knowledge on maternal exposure to fluoride and its biomarkers, has not increased alongside. The objective of this dissertation was to improve our understanding of the dietary intake of fluoride (a major source of fluoride exposure), and spot urinary fluoride levels during pregnancy.
Two secondary data analyses utilizing data from the Early Life Exposures in Mexico to ENvironmental Toxicants (ELEMENT) project were conducted, in a population of women living in a salt-fluoridated community. The first study estimated the dietary intake of fluoride over the course of pregnancy and assessed the influence of compliance with the dietary recommendations of intake of beneficial nutrients for pregnancy (calcium, iron, folate and protein) on the dietary intake of fluoride. The second study compared spot urinary fluoride in women during pregnancy and non-pregnancy (using one-year postpartum as a proxy for the non-pregnant state) and assessed associations between dietary factors (dietary fluoride intake, addition of table salt, calcium intake from diet and supplements, and dietary acid load) and urinary fluoride levels at each state.
Results revealed that the median dietary intake of fluoride in pregnant women was 0.7 mg/day, increased with gestational age and in women who were moderately and highly compliant with recommendations of intake of beneficial nutrients for pregnancy. On the other hand, spot urinary fluoride levels during pregnancy did not significantly differ with those of women one-year postpartum, increased with gestational age, and decreased in calcium-supplemented women only during pregnancy. The dietary intake of fluoride, calcium, and dietary acid load were not associated with urinary fluoride in either state. Finally, reporting the addition of table salt to meals was associated with an increase in urinary fluoride only at one-year postpartum.
The studies in this dissertation highlight the need for a deeper understanding of fluoride exposure and its biomarkers in the pregnant population. / 2022-07-01
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Optimizing Covalent Immune Recruiter Antibody Labelling Kinetics with Sulfur Fluoride Exchange ChemistryEisinga, Sarah 11 1900 (has links)
Covalent antibody recruiting molecules (cARMs) are synthetic chemical tools that direct
antibodies naturally present in human serum to tumor receptors leading to immune recognition
and elimination. cARMs have three general features: an antibody binding domain (ABD), an
antibody labelling domain (ALD), and a tumor binding domain. Proximal to the ABD, the ALD
contains an electrophilic group which is attacked by a nucleophilic amino acid residue on the
target antibody upon cARM binding. Previous cARMs use an acyl-imidazole (AL) ALD to
successfully covalently recruit anti-dinitrophenyl IgG validated via fluorescence SDS-PAGE,and
form immune complexes with PSMA+ HEK cells in ADCP flow experiments.1 Through MS
analysis, AL cARMs were demonstrated to target lysine-59 of antiDNP.1 Problematically, there
are several properties associated with AL chemistry that limit the therapeutic potential of
associated cARMs. These limitations include limited stability in vivo, single amino acid (lysine)
selectivity, and modest intramolecular protein labelling rates (10-5 s-1)1. To target novel antibody
residues and possibly improve the rate of antibody labelling, a second generation of cARMs has
been developed using sulfur fluoride exchange (SuFEx) chemistry as the ALD. Sulfur fluorides
have been broadly used in academic and industrial applications due to intrinsically high stability
and broad amino acid reactivity.2 SuFEx cARMs are hypothesized to have enhanced hydrolytic
stability compared to AL cARMs. This thesis explores the synthesis, stability, binding, and
labeling kinetics of SuFEx cARMs to advance cARM design and development for in vivo
applications. This research contributes collectively to the design and development of novel
therapeutics in chemical biology and immune-oncology research. / Thesis / Master of Science (MSc)
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