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You searched for subject:(irradiance sensitivity). Showing records 1 – 2 of 2 total matches.

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University of Minnesota

1. Harrington, Kelly Anne. Visual sensitivity of Lake Superior fishes.

Degree: MS, 2014, University of Minnesota

Within this study, fish of two ecosystems are investigated: 1) shallow water fishes in waters located in proximity to Duluth-Superior Harbor and 2) open water fishes. Investigation of the former includes a comparison of the invasive round goby to the logperch and black bullhead to surmise any physiological visual advantage for the intruding species. The latter investigation compares the siscowet, kiyi, and deepwater sculpin visual sensitivity to the downwelling light available at depth. Electroretinography was used to formulate spectral sensitivity curves for interspecific comparison. In both studies, fish visual sensitivity matched that of downwelling light available in the respective environments. Logperch showed greater visual depth than the round goby. Siscowet and kiyi visual depth profiles overlapped and deepwater sculpin retained vision at greater depths. Diurnal vision for all species is possible in shallow depths but it is likely that deepwater fishes rely on other sensory modalities during most predator-prey interactions.

Subjects/Keywords: Predator-prey interactions; Spectral irradiance; Visual sensitivity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Harrington, K. A. (2014). Visual sensitivity of Lake Superior fishes. (Masters Thesis). University of Minnesota. Retrieved from http://hdl.handle.net/11299/165478

Chicago Manual of Style (16th Edition):

Harrington, Kelly Anne. “Visual sensitivity of Lake Superior fishes.” 2014. Masters Thesis, University of Minnesota. Accessed September 23, 2020. http://hdl.handle.net/11299/165478.

MLA Handbook (7th Edition):

Harrington, Kelly Anne. “Visual sensitivity of Lake Superior fishes.” 2014. Web. 23 Sep 2020.

Vancouver:

Harrington KA. Visual sensitivity of Lake Superior fishes. [Internet] [Masters thesis]. University of Minnesota; 2014. [cited 2020 Sep 23]. Available from: http://hdl.handle.net/11299/165478.

Council of Science Editors:

Harrington KA. Visual sensitivity of Lake Superior fishes. [Masters Thesis]. University of Minnesota; 2014. Available from: http://hdl.handle.net/11299/165478


University of Illinois – Urbana-Champaign

2. Kim, Katherine A. Voltage-Offset Resistive Control for Photovoltaics.

Degree: MS, 1200, 2012, University of Illinois – Urbana-Champaign

This thesis introduces voltage-offset resistive control (VRC) for photovoltaic (PV) applications that exhibits low sensitivity to solar irradiance changes. Although there are numerous control schemes and maximum power point tracking (MPPT) methods for PVs, few focus on maintaining low sensitivity to irradiance transients. Daily PV electrical characteristics are observed to identify trends in the maximum power point (MPP) movement. Analysis shows that VRC has inherently low sensitivity to irradiance changes and is an effective inner-loop control method to maintain operation at the MPP. For the buck and boost dc-dc converter, simple control equations that represent the ideal VRC equilibrium are examined for stability. Small- and large-signal analyses show that one control equation for the boost converter is stable over the intended operation range???with some limitations based on component values. VRC is implemented using a digital controller on a boost converter PV module. Steady-state stability is verified, and irradiance and control parameter step responses are observed through simulated and experimental results. VRC exhibits stability and fast transient response; it is promising as an effective inner-loop control scheme. A number of MPPT methods that utilize VRC for low irradiance sensitivity are introduced. These methods take measurements and adjust the control periodically; control parameters are held constant between measurements. This sample-and-hold control approach reduces controller computation requirements and power consumption. Traditional and VRC MPPT methods that utilize sample-and-hold operation are compared through simulation. The fractional open-circuit voltage VRC and MPP-current-based VRC methods are identified as effective and simple control solutions for PV systems that maintain high efficiency under irradiance transients. Advisors/Committee Members: Krein, Philip T. (advisor).

Subjects/Keywords: voltage-offset resistive control; photovoltaics; power electronics; dc-dc converter control; maximum power point tracking; irradiance sensitivity; direct current (dc)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Kim, K. A. (2012). Voltage-Offset Resistive Control for Photovoltaics. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/29691

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Kim, Katherine A. “Voltage-Offset Resistive Control for Photovoltaics.” 2012. Thesis, University of Illinois – Urbana-Champaign. Accessed September 23, 2020. http://hdl.handle.net/2142/29691.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Kim, Katherine A. “Voltage-Offset Resistive Control for Photovoltaics.” 2012. Web. 23 Sep 2020.

Vancouver:

Kim KA. Voltage-Offset Resistive Control for Photovoltaics. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2012. [cited 2020 Sep 23]. Available from: http://hdl.handle.net/2142/29691.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kim KA. Voltage-Offset Resistive Control for Photovoltaics. [Thesis]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/29691

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.