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Effects Of Duct Source And Termination Impedance On The Acoustic Response Characteristics Of Duct Elements, Prabhanjan Mysore
Effects Of Duct Source And Termination Impedance On The Acoustic Response Characteristics Of Duct Elements, Prabhanjan Mysore
UNLV Retrospective Theses & Dissertations
The objective of the thesis is to study the effects of termination of an air duct on the acoustic response characteristics of the elements in the duct system. The end reflections due to the mis-match of the acoustic impedance at the termination affect the acoustic characteristics of the duct elements; The ducts of the duct system, terminating into atmosphere abruptly, like the HVAC ducts with diffusers, provide reflective termination. With this type of termination much of the sound energy in lower frequencies is reflected. This sets up standing sound waves inside the duct. The analytical methods to calculate the insertion-loss, …
An Investigation Of Humanizing Elements As A Factor Of Visitor Satisfaction Found In Two Atrium-Type Casino Resort Hotels, Huiting Sun
UNLV Retrospective Theses & Dissertations
The purpose of this study was to investigate the extent to which humanizing components have affected user satisfaction in large interior open spaces of two buildings, which was defined as public atrium space; Public atria spaces were investigated to determine the correlation between various humanizing elements found in these public spaces and the degree of user satisfaction. By means of two methodologies, participant observation and a user survey, the behavior of both individuals and groups using these selected atrium spaces was evaluated to determine user satisfaction found in the atria of two urban resort casino hotels in Las Vegas; Relevant …
Trace Element And Polysaccharide Sorption In A Lacustrine Biofilm, Ephraim G Morris
Trace Element And Polysaccharide Sorption In A Lacustrine Biofilm, Ephraim G Morris
UNLV Retrospective Theses & Dissertations
Twenty-four elements (Al, As, Ba, Ca, Cd, Co, Cr, Cu, Fe, Ga, K, Li, Mg, Mn, Ni, Pb, Rb, Se, Sr, Ti, U, V, Zn, and Zr) were determined in freshwater biofilms from Lake Mead by inductively coupled plasma mass spectrometry and flame atomic absorption spectrophotometry. The uptake of polysaccharides (as glucose) was determined by ultraviolet/visible spectrophotometry. Taxonomic identification of the biofilm was determined using a stereo and compound microscopes. Major components included the diatoms Cyclotella, Fragilaria, Cymbella, and Amphora. Results for both major cations and trace elements presented for filtered lake water and for particulates filtered from the water …
Low Harmonic Distortion Flash A/D Converters Incorporating Dynamic Element Matching Techniques, Bret David Steadman
Low Harmonic Distortion Flash A/D Converters Incorporating Dynamic Element Matching Techniques, Bret David Steadman
UNLV Retrospective Theses & Dissertations
New dynamic element matching techniques are shown to reduce the harmonic distortion and improve the spurious-free dynamic range of flash ADCs. Resistor chain mismatch errors are negated by randomly rearranging the resistors each sample by utilizing 5(2{dollar}\sp{b}{dollar}-1) digital switches and b + 1 random control signals for a b-bit flash ADC. The integral and differential nonlinearity of a non-ideal flash ADC are derived for three common resistor chain mismatch errors; namely, geometric mismatches, linear gradient mismatches, and dynamic mismatches. The transfer function of a non-ideal flash ADC is also derived and the converter output is shown to consist of a …