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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.
31

Passively Mode-Locked Lasers Using Saturable Absorber Incorporating Dispersed Single-Wall Carbon Nanotubes

Haung, Zih-shun 09 July 2009 (has links)
The dependence of single-wall carbon nanotubes-based saturable absorber (SWCNTs SA) on concentration and thickness for mode-locked laser pulse formation is comprehensively investigated. The peak absorption wavelength of SWCNTs SA is engineered within the gain band-width of erbium-doped fiber centered near 1550 nm. The optima full-width half-maximum (FWHM) of pulses was obtained as the concentrations of SWCNTs SA was 0.05 wt%. This indicates that the laser pulse become shorter as the concentration of SWCNTs SA increases. The result also showed that the FWHM of pulses from 3.43 to 1.85 ps were found as the thickness of SWCNTs SA increased from 8 to 100 um. This also indicates that the laser pulse become shorter as the thickness of SWCNTs SA increases. However, the pulse width significantly broadened as concentration increased to 0.1 wt% and became stable as thickness of SWCNTs SA increased from 100 to 264 um for passively mode-locked lasers. An in-depth study on the optimum fabrication of concentration and thickness of SWCNTs SA for laser pulse formation may allow developing a cost-effective mode-locked laser with high performance as well as broadly benefit to the utilization of many other low-cost nanodevices.
32

Stable optical frequency comb generation and applications in arbitrary waveform generation, signal processing and optical data mining

Ozharar, Sarper. January 2008 (has links)
Thesis (Ph.D.)--University of Central Florida, 2008. / Adviser: Peter J. Delfyett, Jr. Includes bibliographical references (p. 123-130).
33

Psykosocial arbetsmiljö och arbetsplats/- yrkesinlåsning samt dess samband : Undersköterskor och skötares arbetssituation

Pettersson, Sebastian, Viklund, Morgan January 2015 (has links)
Vårdpersonal har i studier beskrivits utsättas för stress, emotionell utmattning samt utbrändhet genom lågt inflytande eller låg kontroll över ställda krav. Studier inom offentlig verksamhet visar också att det finns arbetstagare som befunnit sig i arbetsplatsinlåsning, yrkesinlåsning eller i dubbelinlåsning. Denna enkätstudie ämnade att med mätinstrumentet Psykosocial arbetsmiljökartläggning (PAK) mäta två klinikers psykosociala arbetsmiljö hos 109 undersköterskor och skötare på ett sjukhus i Mellansverige. Studien ämnade även att mäta om arbetsplatsinlåsning, yrkesinlåsning samt dubbelinlåsning förekom och om det fanns ett samband mellan den psykosociala arbetsmiljön och inlåsningsbegreppen. Resultatet av den psykosociala arbetsmiljöns mätning visade att egenkontroll, arbetsledning och arbetsbelastning skattades lågt medan stimulans och arbetsgemenskap skattades positivt. Antal inlåsta individer översteg 20 % på alla inlåsningsbegrepp. Studien fann även ett statistiskt signifikant samband mellan begreppet psykosocial arbetsmiljö och arbetsplats/-yrkesinlåsning samt dubbelinlåsning. Studien bör gå vidare med kvalitativ metodik, att hos arbetstagarna ta reda på de bakomliggande orsakerna till studiens resultat.
34

An equivalent circuit structure macromodel for analog phase locked loops

Choi, Pyung 05 1900 (has links)
No description available.
35

Design techniques for PVT tolerant phase-locked loops /

Wu, Ting. January 1900 (has links)
Thesis (Ph. D.)--Oregon State University, 2007. / Printout. Includes bibliographical references (leaves 93-97). Also available on the World Wide Web.
36

Streak camera analysis of dynamic characteristics of current modulated diode laser arrays /

Hartnett, Kathleen A., January 1988 (has links)
Thesis (M.S.)--Oregon Graduate Center, 1988.
37

Interference cancellation in broadband wireless systems utilizing phase aligned injection-locked oscillators

Wang, Xin, January 1900 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2008. / Vita. Includes bibliographical references.
38

Phase locked loop analysis and design

Ratcliff, Marcus. Dai, Foster, January 2008 (has links)
Thesis--Auburn University, 2008. / Abstract. Includes bibliographical references (p. 49-50).
39

Delay-locked loop techniques in direct sequence spread-spectrum receivers /

Thayaparan, Subramaniam. January 1999 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2000. / Includes bibliographical references (leaves 108-114).
40

Performance study of uniform sampling digital phase-locked loops for [Pi]/4-differentially encoded quaternary phase-shift keying /

Vong, Chun-yin. January 1998 (has links)
Thesis (M. Phil.)--University of Hong Kong, 1999. / Includes bibliographical references (leaves 123-126).

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