Thesis (doctoral)--University of Tartu, 2006. / This dissertation is based on 4 papers. Includes bibliographical references.

Narrowband spectrophotometric observations of outer solar system (semi-major axis greater than 3.2 AU) asteroids have been used to investigate the surface compositions of the D- and P-class asteroids in an effort to learn about their origins and formation conditions. Spectra of 20 outer solar system asteroids and 2 main-belt D-class asteroids were obtained using two charge-coupled device (CCD) spectrographs. No mineralogical absorption features were evident. The spectra can be divided into four groups based upon four discrete slopes among the spectra. The slope increases (reddens) with increasing heliocentric distance. All of the asteroids observed are locked in orbits driven by Jupiter's gravitational attraction. The distinct slope changes suggest that these asteroids are the remnants of a gradation in composition of planetesimals in the outer solar system, which were selectively retained in location when other material was lost. Three possible compositions based upon organic polymer materials are discussed. A coronograph/spectrograph was designed to be used with a CCD camera for data acquisition. This instrument can be used for both astronomical imaging and spectrophotometry across the 0.46- to 1.0- μm spectral region. Options to reduce the diffracted light from a telescope and block the light from bright astronomical objects permit high resolution imaging of both bright and faint objects. Direct (1:1) or reducing (2.7:1) imaging is available. Two grisms provide ∼40- Å resolution spectral coverage of the full spectral region. The instrument is modular and easily transported to observing sites.

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Thesis (M.S.)--University of Wisconsin--Madison. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 91-94).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1950. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 168-172).

Thesis (M.S.)--Brigham Young University. Dept. of Physics and Astronomy, 2007. / Includes bibliographical references (p. 81-82).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1939. / Typescript. Includes abstract and vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 104-107).

Made available in DSpace on 2014-10-09T12:24:41Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:04:17Z (GMT). No. of bitstreams: 1 00426.pdf: 1108368 bytes, checksum: 07f3d4698c9590abf2d11efd1657f4bf (MD5) / Dissertacao (Mestrado) / IEA/D / Instituto de Quimica, Universidade de Sao Paulo - IQ/USP

Made available in DSpace on 2014-06-11T19:29:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-11-24Bitstream added on 2014-06-13T19:38:00Z : No. of bitstreams: 1 silvajunior_rc_me_sjrp.pdf: 403500 bytes, checksum: 3cd17a24d35b6720b9e58848e90ec823 (MD5) / No presente trabalho, foi desenvolvido um método analítico destinado à quantificação do fungicida Tiram baseado na capacidade que este possui de complexar íons Cu2+. A quantificação foi efetuada por meio do acoplamento de espectrofotometria visível a um reator de fase sólida (RFS) utilizando de técnicas de análise em fluxo. O RFS utilizado foi constituído por um tubo de plástico (12 cm e 2 mm d.i.) preenchido por resina poliéster finamente triturada contendo fosfato de Cu2+ imobilizado. Durante o contato de 100 µL de Tiram com íons Cu2+ imobilizados na resina, forma-se o complexo Cu2+ / Tiram. Nesta etapa, o complexo é liberado para a solução carregadora (água) a uma vazão de 2,5 mL min-1. Sendo intensamente colorido esta espécie é a base do presente método de quantificação a 439 nm. Com o desenvolvimento da reação, a curva analítica obtida foi linear no intervalo de concentração de 3,0 x 10-5 a 3,4 x 10-4 mol L-1, com limite de detecção de 6,95 x 10-5 mol L-1 e freqüência de amostragem de 60 determinações por hora / In this dissertation an analytical method for the Thiram fungicide quantification, based on the capacity which it has a complex copper ions was developed. The quantification was performed by mean of visible spectrophotometry coupling a solid-phase reactor using flow techniques. The solid-phase reactor used is consisting of a plastic tube (12 cm and 2 mm diameter) filled with finely crushed polyester resin containing copper phosphate immobilized. During the contact of 100 µL Thiram with Cu2 + ions immobilized on the resin is formed the complex Cu2 + / Thiram. At this stage, the complex is released into the carrier solution (water) with flow rate of 2,5 mL min-1 being intensely colored and this species is the basis of this method of quantification at 439 nm. With the development of the reaction, analytical curve was linear on the concentration range of 3,0 x 10-5 to 3,0 x 10-4 mol L-1 with a detection limit of 6,95 x 10-5 mol L-1 and a sampling frequency of 60 determinations per hour