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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.
11

Radiation dose analysis of NPS flash X-ray facility using silicon PIN diode /

Jones, Bernard L. January 2003 (has links) (PDF)
Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 2003. / Thesis advisor(s): Todd R. Weatherford, Andrew A. Parker. Includes bibliographical references (p. 39). Also available online.
12

THE USE OF A SELF-SCANNING SILICON PHOTODIODE ARRAY FOR ASTRONOMICAL SPECTROSCOPY

Geary, John Charles, 1945- January 1975 (has links)
No description available.
13

Alternate configurations for blocked impurity band detectors /

Garcia, Jonathan C. January 2004 (has links) (PDF)
Thesis (M.S. in Applied Physics)--Naval Postgraduate School, Dec. 2004. / Thesis Advisor(s): Nancy M. Haegel, Gamani Karunasiri. Includes bibliographical references (p. 43-45). Also available online.
14

New approaches for designing high voltage, high current silicon step recovery diodes for pulse sharpening applications.

Chudobiak, Michael John, January 1900 (has links)
Thesis (Ph. D.)--Carleton University, 1996. / Includes bibliographical references. Also available in electronic format on the Internet.
15

Application of the photodiode in design and implementation of a 2-D position detector

Cha, Jae H. 17 March 2010 (has links)
see document / Master of Science
16

Models of Single Neurons and Network Dynamics in the Medullary Transverse Slice

Purvis, Liston Keith 20 November 2006 (has links)
The pre-Botzinger complex (pBC) is a sub-circuit of the respiratory central pattern generator. The pBC is required for eupnea and is contained in a transverse slice of the ventrolateral medulla. In the slice, pBC cells are responsible for generating the respiratory rhythm, and hypoglossal motoneurons (HMs) are responsible for transmitting the rhythm out of the brainstem to the muscles. Understanding how the transverse slice rhythm is generated and transmitted is a first step in understanding how this process occurs in vivo. To understand this network, we developed ionic current models of the individual network components and explored how the various ion channels affect single-cell firing characteristics and network dynamics. First, we used the considerable amounts of experimental data from neonatal HMs to develop an HM model. The model was used to explore the roles of ion channels in shaping the complex dynamics of the neonatal HM action potential (AP) and to investigate the age-dependent changes in HMs. We used a genetic algorithm to optimize the HM model to more closely fit experimental measures of AP shape. A comparison of feature-based and template-based fitness functions revealed that a feature-based fitness function performs best when optimizing the HM model to fit characteristics of the neonatal HM AP. Next, we used our existing pBC models to understand how different ionic currents affect rhythmogenesis in the pBC. Our results indicate that intrinsic bursters increase the robustness of rhythm generation in the pBC. Finally, we developed an improved pBC neuron model and explored how various ion channels affect bursting dynamics at the single-cell level. The HM and pBC models developed in this study will be used in future network models of the transverse slice.
17

The integration of Si-based resonant interband tunnel diodes with CMOS /

Sudirgo, Stephen. January 2003 (has links)
Thesis (M.S.)--Rochester Institute of Technology, 2003. / Typescript. Includes bibliographical references (leaves 103-106).
18

Caracterização das propriedades dosimétricas de diodos de silício empregados em radioterapia com feixe de fótons / Dosimetric properties characterization of silicon diodes used in photon beam radiotherapy

BIZETTO, CESAR A. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:41:26Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:03:26Z (GMT). No. of bitstreams: 0 / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
19

Espectrometria de raios-x com diodos de Si

MAGALHAES, RODRIGO R. de 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:44:12Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:06:56Z (GMT). No. of bitstreams: 1 06889.pdf: 2660879 bytes, checksum: 1ad6cb9abd7b6c1a92d40f0b7cb82b55 (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP / FAPESP:97/12485-4
20

Caracterização das propriedades dosimétricas de diodos de silício empregados em radioterapia com feixe de fótons / Dosimetric properties characterization of silicon diodes used in photon beam radiotherapy

BIZETTO, CESAR A. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:41:26Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:03:26Z (GMT). No. of bitstreams: 0 / No presente trabalho foi estudada a resposta de diodos epitaxiais (EPI) e fusão zonal (FZ) como dosímetros on-line em tratamentos radioterápicos com feixe de fótons na faixa de megavoltagem (diodo tipo EPI)e ortovoltagem (diodos tipo EPI e FZ). Para serem usados como dosímetros os diodos foram encapsulados em sondas de polimetilmetacrilato preto (PMMA). Para as medidas da fotocorrente os dispositivos foram conectados a um eletrômetro Keithley® 6517B no modo fotovoltaico. As irradiações foram feitas com feixes de fótons de 6 e 18 MV (acelerador Siemens Primus®),6 e 15 MV (acelerador Novalis TX®) e 10, 25, 30 e 50 kV de um equipamento de Radiação X Pantak/Seifert. Nas medidas com o acelerador Siemens Primus® os diodos foram posicionados entre placas de PMMA a uma profundidade de 10,0 cm e com o acelerador Novalis TX® mantidos entre placas de água sólida a uma profundidade de 5cm. Em ambos os casos, os diodos foram centralizados em campos de radiação de 10 × 10 cm2, com distância fonte superfície (DFS) mantida fixa em 100 cm. Para as medidas com os feixes de fótons deortovoltagem os diodos foram posicionados a 50 cm do tubo em um campo de radiação circular de 8 cm de diâmetro. A linearidade com a taxa de dose foi avaliada para as energias de 6 e 15MV do acelerador Novalis TX® variando-se a taxa de dose de 100 a 600 unidades monitoras por minuto e para o feixe de 50 kV variando-se a corrente do tubo de 2 a 20 mA. Todos os dispositivos apresentaram respostas lineares com a taxa de dose e dentro das incertezas, independência da carga com a mesma. Os sinais de corrente mostraram boa repetibilidade, caracterizada por coeficientes de variação em corrente (CV) inferiores a 1,14%(megavoltagem) e 0,15%(ortovoltagem) e em carga menores que 1,84% (megavoltagem) e 1,67% (ortovoltagem). Foram obtidas curvas dose-resposta lineares com coeficientes de correlação linear melhores que 0,9999 para todos os diodos. / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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