Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for subject:(State Adjustment Model). Showing records 1 – 2 of 2 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Queens University

1. Dai, Wen Hong. On the Simulation and Prediction of Bed Morphological Adjustments of Equilibrium in Alluvial Meandering Streams .

Degree: Civil Engineering, 2009, Queens University

This thesis concerns the computation of bed adjustments of equilibrium in alluvial meandering streams. It is assumed that the channel centerlines follow sine-generated curves, the banks are rigid, and the steady-state flow is turbulent and sub-critical. The flow width is assumed to remain constant in the streamwise direction, and the flow width-to-depth ratio is large (>=15, say). The bed material is cohesionless and homogeneous. The purpose of the thesis is to develop and test a numerical model for the computation of bed development, given the aforementioned idealized conditions. The model comprises: 1- an initial bed topography generator, to generate the bed at time t = 0 of the calculations; 2- the vertically-averaged hydrodynamic model of Zhang (2007) to calculate the flow fields; and 3- a sediment transport model to relate the bed deformation to the flow. Both the initial bed topography generator (expression of the deformed bed surface) and the numerical sediment transport model based on the sediment transport continuity equation are original and developed entirely by the author. The resulting model is computationally very efficient. In contrast to previous works on the theoretical determination of bed deformation, the beds at the beginning of the calculations may represent any stage of the development process, and not necessarily the initial flat bed. The bed deformation was tested for several test cases, devised on the basis of laboratory runs available in the literature. These include Run ME-2 by Hasegawa (1983) in a 30-degree-channel, Run 3 by Binns (2006) in a 70-degree-channel and the run by Termini (1996) in a 110-degree-channel. The erosion/deposition patterns of the computed equilibrium bed topographies were found to be in reasonable agreement with their measured counterparts. However, as evidenced by the difference plots included in this thesis, in detail there are substantial differences between the computed and measured equilibrium beds, especially in the regions near the banks. As a by-product of the present thesis, the functions representing the parameters required by the hydrodynamic model of Zhang (2007) were also evaluated. In particular, the present results suggest that the coefficient Alpha-q appearing in the expression of the local friction factor (used in the flow model of Zhang 2007) depends on the flow width-to-depth ratio and bed roughness to a much larger extent than previously thought. Considering this, a generalization of the expression of Alpha-q due to El-Tahawy (2004) (and adopted by Zhang 2007 in her model) is proposed. Future work should be carried out to address the application of the present model to real river conditions, including generalizations to irregular meandering plan shapes, unsteady-state flows and non-homogenous bed materials.

Subjects/Keywords: Numerical Modeling ; Meandering Stream ; Bed Adjustment ; Equilibrium State ; Geometry Model ; Sediment Transport Model

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Dai, W. H. (2009). On the Simulation and Prediction of Bed Morphological Adjustments of Equilibrium in Alluvial Meandering Streams . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/1639

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):

Dai, Wen Hong. “On the Simulation and Prediction of Bed Morphological Adjustments of Equilibrium in Alluvial Meandering Streams .” 2009. Thesis, Queens University. Accessed September 18, 2020. http://hdl.handle.net/1974/1639.

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

MLA Handbook (7th Edition):

Dai, Wen Hong. “On the Simulation and Prediction of Bed Morphological Adjustments of Equilibrium in Alluvial Meandering Streams .” 2009. Web. 18 Sep 2020.

Vancouver:

Dai WH. On the Simulation and Prediction of Bed Morphological Adjustments of Equilibrium in Alluvial Meandering Streams . [Internet] [Thesis]. Queens University; 2009. [cited 2020 Sep 18]. Available from: http://hdl.handle.net/1974/1639.

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

Council of Science Editors:

Dai WH. On the Simulation and Prediction of Bed Morphological Adjustments of Equilibrium in Alluvial Meandering Streams . [Thesis]. Queens University; 2009. Available from: http://hdl.handle.net/1974/1639

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

2. Dharmasena, Kalu Arachchillage Senarath. The Non-alcoholic Beverage Market in the United States: Demand Interrelationships, Dynamics, Nutrition Issues and Probability Forecast Evaluation.

Degree: PhD, Agricultural Economics, 2011, Texas A&M University

There are many different types of non-alcoholic beverages (NAB) available in the United States today compared to a decade ago. Additionally, the needs of beverage consumers have evolved over the years centering attention on functionality and health dimensions. These trends in volume of consumption are a testament to the growth in the NAB industry. Our study pertains to ten NAB categories. We developed and employed a unique cross-sectional and time-series data set based on Nielsen Homescan data associated with household purchases of NAB from 1998 through 2003. First, we considered demographic and economic profiling of the consumption of NAB in a two-stage model. Race, region, age and presence of children and gender of household head were the most important factors affecting the choice and level of consumption. Second, we used expectation-prediction success tables, calibration, resolution, the Brier score and the Yates partition of the Brier score to measure the accuracy of predictions generated from qualitative choice models used to model the purchase decision of NAB by U.S. households. The Yates partition of the Brier score outperformed all other measures. Third, we modeled demand interrelationships, dynamics and habits of NAB consumption estimating own-price, cross-price and expenditure elasticities. The Quadratic Almost Ideal Demand System, the synthetic Barten model and the State Adjustment Model were used. Soft drinks were substitutes and fruit juices were complements for most of non-alcoholic beverages. Investigation of a proposed tax on sugar-sweetened beverages revealed the importance of centering attention not only to direct effects but also to indirect effects of taxes on beverage consumption. Finally, we investigated factors affecting nutritional contributions derived from consumption of NAB. Also, we ascertained the impact of the USDA year 2000 Dietary Guidelines for Americans associated with the consumption of NAB. Significant factors affecting caloric and nutrient intake from NAB were price, employment status of household head, region, race, presence of children and the gender of household food manager. Furthermore, we found that USDA nutrition intervention program was successful in reducing caloric and caffeine intake from consumption of NAB. The away-from-home intake of beverages and potential impacts of NAB advertising are not captured in our work. In future work, we plan to address these limitations. Advisors/Committee Members: Capps, Oral (advisor), Bessler, David A. (committee member), Love, Alan H. (committee member), Williams, Gary W. (committee member), Anderson, Richard K. (committee member).

Subjects/Keywords: Non-alcoholic beverages; Heckman Model; Quadratic Almost Ideal Demand System; Houthakker and Taylor model; Barten Synthetic Model; State Adjustment Model; Demand systems; Probability Forecast Evaluation; The Brier Score; Nutritional Contributions of Non-alcoholic beverages; Diversion Ratio; Sugar-sweetened beverages; Yates Partition of the Brier score

…Inventory Behavior: The State Adjustment Model… …STATE ADJUSTMENT MODELS .................................. 688 APPENDIX 6 REGRESSION RESULTS… …152 Demographic Study: Choice to Consume ................................... 152 Model… …169 Model Development: Heckman Two-Step Analysis ............. 169 Empirical Results: Cross… …System (LA/QUAIDS) Model… 

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Dharmasena, K. A. S. (2011). The Non-alcoholic Beverage Market in the United States: Demand Interrelationships, Dynamics, Nutrition Issues and Probability Forecast Evaluation. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7911

Chicago Manual of Style (16th Edition):

Dharmasena, Kalu Arachchillage Senarath. “The Non-alcoholic Beverage Market in the United States: Demand Interrelationships, Dynamics, Nutrition Issues and Probability Forecast Evaluation.” 2011. Doctoral Dissertation, Texas A&M University. Accessed September 18, 2020. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7911.

MLA Handbook (7th Edition):

Dharmasena, Kalu Arachchillage Senarath. “The Non-alcoholic Beverage Market in the United States: Demand Interrelationships, Dynamics, Nutrition Issues and Probability Forecast Evaluation.” 2011. Web. 18 Sep 2020.

Vancouver:

Dharmasena KAS. The Non-alcoholic Beverage Market in the United States: Demand Interrelationships, Dynamics, Nutrition Issues and Probability Forecast Evaluation. [Internet] [Doctoral dissertation]. Texas A&M University; 2011. [cited 2020 Sep 18]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7911.

Council of Science Editors:

Dharmasena KAS. The Non-alcoholic Beverage Market in the United States: Demand Interrelationships, Dynamics, Nutrition Issues and Probability Forecast Evaluation. [Doctoral Dissertation]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7911

.