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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.
91

Synthesis, characterization, and electrochemistry of isocyanide complexes of chromium and bis(arene) chromium complexes

Essenmacher, Gery Joseph, January 1976 (has links)
Thesis--Wisconsin. / Vita. Includes bibliographical references.
92

The normal oxidation-reduction potentials of the system hexavalent-trivalent chromium the intermediate formation of tetravalent chromium ...

De Gray, Richard John, January 1940 (has links)
Thesis (Ph. D.)--Columbia University, 1940. / Vita. Bibliography: p. [19].
93

Techniques for the neutralization of the effect of chromium in malleable iron

Singh, Ravindra. January 1977 (has links)
Thesis--Wisconsin. / Includes bibliographical references (leaves 93-95).
94

A toughness study of AISI H-13 steel

Valencia, Asdrubal. January 1980 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1980. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 79-84).
95

Kinetics and mechanisms of reactions of chromium (VI) with iron (II) species

Espenson, James H. January 1962 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1962. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
96

On the casting of dental Co-Cr alloys

Strandman, Erik. January 1976 (has links)
Thesis--Göteborg. / Includes reprints of author's articles.
97

Ueber Lösungen des Chromhydroxydes in Basen

Fischer, Waldemar Herman Eberhard Ernst, January 1902 (has links)
Inaug.-Diss. - Breslau. / Vita.
98

Application of Nanomaterials for the Removal of Hexavalent Chromium and their Biological Implications

Burks, Terrance January 2016 (has links)
The International Agency for Research on Cancer (IARC) stated that chromium in the form of Cr(VI) has been deemed to be a class-A human carcinogen. It has been a major contaminant associated with wastewater. Moreover, the existence of heavy metals in aquatic systems is a critical concern for the environment as well as industries that manufacture or consume these particular elements. In order to remove these particular toxic metals, several well-known conventional methods including ion-exchange, filtration and adsorption are used. Amongst these methods, adsorption offers significant advantages such as the low-cost materials, ease of operation and efficiency in comparison to the other conventional methods. The aim of this work was to develop nanomaterials (particles and fibers) to address some critical issues for the treatment of heavy metals, especially chromium in aqueous systems. Furthermore, the use of nanomaterials and how they relate to nanoscale operations at the biological level has generated considerable concerns in spite of their novel properties. The first part of this thesis deals with the synthesis and characterizations of Fe3O4, magnetite, as nanoparticles which were further coated with surfactants bis(2,4,4-trimethylpentyl)dithiophosphinic acid, Cyanex-301, and 3-Mercaptopropionic acid with the active compound being the thiol (SH) groups, that will suffice as a viable material for Cr(VI) removal from aqueous solutions. The proposed mechanism was the complexation between the thiol group on Cyanex-301 and 3-Mercaptopropionic acid, respectively. The effect of different parameters on the adsorption including contact time, initial and final Cr(VI) ion concentration and solution pH was investigated. The second part of this thesis encompassed the fabrication of flexible nanocomposite materials, with a large surface area and architecture for the removal of Cr(VI) in batch and continuous flow mode. A technique known as electrospinning was used to produce the nanofibers. The flexible yet functional materials architecture has been achieved by growing ZnO nanorod arrays through chemical bath deposition on synthesized electrospun poly-L-lactide nanofibers. Moreover, polyacrylonitrile nanofibers (PAN) were synthesized and adapted by the addition of hydroxylamine hydrochloride to produce amidoxime polyacrylonitrile nanofibers (A-PAN). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to identify the morphologies and particle sizes whereas Fourier-Transform Infrared spectroscopy (FT-IR) was used to identify either the presence or absence of functional groups for the formation of PAN and A-PAN nanofibers. The optimization of functionalized nanoadsorbents to adsorb Cr(VI) was also carried out to investigate the effect of experimental parameters: contact time, solution pH, initial, final and other metal ion concentration. Commercially manufactured pristine engineered (TiO2, ZnO and SiO2) nanoparticles and lab-made functionalized (Fe3O4 and CeO2) nanoparticles were studied while the powders were suspended in appropriate media by Dynamic Light Scattering (DLS) to identify their cytotoxicity effects. / <p>QC 20160111</p>
99

Estudo da absorcao percutanea de cromo em ratos (utilizacao do cromo-51 como tracador)

VIANA, MARIA de N. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:23:18Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:57:21Z (GMT). No. of bitstreams: 1 01037.pdf: 935328 bytes, checksum: ff8c1531e582a0ca8cc764019d7db537 (MD5) / Dissertacao (Mestrado) / IEA/D / Instituto de Biociencias, Universidade de Sao Paulo - IB/USP
100

The determination of chromium in human serum and urine

Murray, George January 1987 (has links)
A critical evaluation of the published data for chromium levels in serum and urine shows major discrepancies, indicating that further work to establish normal values for these parameters is necessary. Methods have been developed for the determination of total protein-bound, and alpha-2-globulin-bound, chromium in serum, and chromium in urine. The sample pretreatment for serum is based on concurrent protein precipitation and dehydration using propan-2-ol for the total protein-bound chromium, and 0.5M hydrochloric acid in propan-2-ol for the alpha-2-globulin-bound metal. The precipitates are washed in propan-2-ol, then in toluene. Urine aliquots equivalent to 20 umol creatinine are dried at 75&deg; C. Acetic acid (plus 7.5% v.v. sulphuric acid) and 1,1,1,5,5,5-hexafluoropenta-2,4-dione are added to the serum precipitates and urine residues. The chromium in the specimens is converted to the beta-diketonate at 75&deg; C, and the complex extracted with petroleum spirit. The excess diketone is removed by washing with phosphate buffer. The chromium is back-extracted with ammonia in EDTA solution and, after an evaporation step, dissolved in ammonium acetate solution. Atomic absorption spectrometry with electrothermal atomisation is used to measure the chromium, and because of the matrix simplification achieved, background correction is not necessary. The mean results on serum from normal subjects were 0.11 ug/L for total protein-bound chromium, and 0.07 ug/L for alpha-2-globulin-bound chromium. The detection limit was 0.03 ug Cr/L for both serum parameters. The mean normal value for urinary chromium was 0.44 ug/ 10 mmol creatinine, with a detection limit of 0.05 ug Cr/10 mmol creatinine. The analytical relative standard deviations for the three parameters at the above levels were: 7%, 9% and 13%respectively. The serum chromium parameters did not show a significant response to a glucose challenge. Precautions against sample contamination were taken, and techniques for reagent purification, and equipment cleaning to a high standard were developed.

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