The high feed grain prices of the last few years and the resulting high prices for heavy feeder cattle relative to lightweight feeder calves may provide economic incentives to market cattle from rangelands as yearlings. A majority of the economic studies investigating the profitability of retained ownership of beef calves to sell as yearlings have used a budgeting technique to compare a straight cow-yearling operation retaining all calves, to a straight cow-calf operation selling all calves. In this study linear programming was used to develop an optimum combination of various livestock marketing alternatives for maximizing net ranch income. Two typical Utah ranch sizes (150 and 300 head of brood cows) were modeled and optimum range livestock marketing schemes were developed using linear programming analysis. Based on average Utah cattle prices for 1970-1975 the optimum range livestock management alternatives for both ranch sizes in terms of maximizing net ranch income was to reduce the cow herd 25 percent and use the released feed resources to retain all steer calves for sale as yearlings. Retention of heifer calves was not profitable a nd they were sold a t weaning . Net ranch income for the optimum strategy was only slightly higher than the income of the base cow-calf ope ration for the small ranch. The large ranch showed a larger gal.n in net ranch income from retention of yearlings . The capital requirement of the optimum strategies was three to five percent less than for the base cow-calf operations. A reduction in the size of the breeding herd to accommodate retained yearlings would result in a r eduction in the number of feeder livestock marketed. Potential decreases in U. S. beef production f rom 1 to 4 percent were estimated if 25-100 percent of the ranchers in the 11 western states adopted the optimum management alternative. These reductions would result in an increase in the price of beef in the U. S. of 1 to 6 percent.

West and northwest of Logan City there are approximately 2,372 acres of land irrigated by water from the Logan Cow Pasture Water Company irrigation system. This company is a nonprofit corporation organized by a group of land owners for the purpose of arranging conveyance of water ta their farms and ranches.

Water conservation practices are being widely implemented to alleviate sediment and nutrient losses from agricultural land and unsustainable groundwater use for irrigation. Tailwater recovery (TWR) systems are conservation practices being implemented to collect and store runoff to reduce nutrient losses and provide a source of irrigation water. This collection of research is focused on evaluating TWR systems through the following actions: 1) investigate ability to reduce solids and nutrients delivery to downstream systems, 2) compare differences in solid and nutrient concentrations in surface water samples from TWR systems to irrigation water from a TWR systems; 3) determine the potential to irrigate water containing solids and nutrients; 4) quantify a water budget for TWR systems; 5) conduct cost and benefit analyses of TWR systems; and 6) analyze economic cost to reduce solids and nutrients and to retain water. Tailwater recovery systems did not significantly reduce concentrations of solids and nutrients; however, loads of solids, P, and N were significantly reduced by 43%, 32% and 44%, respectively. Mean nutrient loads per hectare available to be recycled onto the landscape were 0.20 kg ha-1 P and 0.86 kg ha-1 N. Water budget analyses show these systems save water for irrigation but were inefficient. Net present value (NPV) and benefit cost ratios were positive and >1 for producers who owned the land, but remained <1 if land was rented. However, beyond improvements to irrigation infrastructure, farms with a TWR system installed lost NPV of $51 to $328 per ha. Mean total cost to reduce solids using TWR systems ranged from $0 to $0.77 per kg, P was $0.61 to $3,315.72 per kg, and N was $0.13 to $396.44 per kg. The mean total cost to save water using TWR systems ranged from $189.73 to $628.23 per ML, compared to a mean cost of groundwater of $13.99 to $36.17 per ML. Mechanistically, TWR systems retain runoff on the agricultural landscape, thereby reducing the amount of sediment and nutrients entering downstream waterbodies and provide an additional source of water for irrigation; however, more cost-effective practices exist for nutrient reduction and providing water for irrigation.

This work seeks to compare various Acetone-Butanol-Ethanol (ABE) fermentation extraction chemicals on an economic and environmental basis. The chemicals considered are: decane, a decane/oleyl alcohol blend, decanol, a decanol/oleyl alcohol blend, 2-ethyl-hexanol, hexanol, mesitylene, and oleyl alcohol. To facilitate comparison a pure-distillation base case was also considered. The aforementioned extractants are a mix of both toxic and non-toxic extractants. Non-toxic extractants can be used directly in fermentation reactors, improving overall fermentation yield by removal of toxic butanol. The extractants were modelled in Aspen Plus V8.8 and separation trains were designed to take advantage of extractant properties. The separation section of the plant was then integrated with upstream and downstream units to determine the Minimum Butanol Selling Prices (MBSP) for second generation extractive ABE fermentation. Upstream processes include biomass (switchgrass) solids processing, biomass pre-treatment/saccharification and fermentation while downstream processes include utility generation and wastewater treatment. The cost of CO2 equivalent emissions avoided (CCA) was used as a metric to compare environmental impact of each process as compared to gasoline. The economic best and environmental best extractant is shown to be 2-ethyl-hexanol with a MBSP of $1.58/L and a CCA of $471.57/tonne CO2 equivalent emissions avoided. Wastewater treatment, which is often ignored in other works, was found to makeup over 30% of total installed capital cost for all extractants. / Thesis / Master of Applied Science (MASc)

For many years some people have dismissed the idea that small generators placed close to loads could replace large central generation plants. In the near future, this idea will probably hold true. However, many companies today are producing small generators that will have a great impact on the power grid. These generators can be used to improve the overall service to a particular area. Also, these generators can also be used to save an electric utility or end-use customer a significant amount of money. However, there are a lot of concerns in using distributed generation. As a result, there are many different issues that need to be investigated when distributed generation is used. In this thesis, a guidebook is developed for an engineer to use when distributed generation is being considered. By following this guidebook an engineer should be able to investigate proper engineering and economic issues. The engineering issues the engineer should consider are coordination, application of protective devices, voltage control, transformer winding configuration, reduction of losses and islanding. By following this guidebook, the engineer should also consider certain economic issues that include the impact of distributed generation on generation, transmission and distribution companies, the impact of distributed generation on wholesale and retail rates, and the costs associated with installation, operation and maintenance of distributed generation. As an example application, the requirements found in the guidebook are applied to a particular scenario for an existing facility that is served by a distribution company.

No description available.

The implementation of the North American Free Trade Agreement (NAFTA) between the United States, Canada, and Mexico created a barrier-free production and trade zone in North America. Surrounding the implementation of NAFTA, a great volume of public, political, and academic attention was given to the impact of the agreement on the aging U.S. textile industry with high labor costs. The major NAFTA provisions, the elimination of tariffs and quotas and rules of origin, were predicted to create and divert U.S. trade in textile goods and expand domestic textile production activities. Since its implementation, however, volatile macroeconomic and political environmental changes have severely interfered with the role of NAFTA. Over ten years have passed since the implementation of NAFTA. The objectives of this research are to investigate the pattern of the U.S. textile industry's production activities under NAFTA and to determine the impact of the agreement on the industry's production activities. This research consists of two parts. Part I is a qualitative analysis that investigates changes in the industry's trade and production activities under NAFTA based on the review of literature and trade and industry data. Part II of this research, a quantitative analysis, applies a normalized restricted translog profit model to the textile industry's production activities under the influence of NAFTA in order to identify the pattern of the industry's output supply and input demand and to determine the impact of NAFTA on the industry. The outcomes of these analyses are used to make an overall assessment of the impact of NAFTA on the U.S. textile industry and draw policy implications. The outcome of the qualitative analysis suggests NAFTA as an effective policy in expanding and regionalizing U.S. trades in textile goods and promoting domestic textile production activities in the early years of implementation. Since the late 1990s, however, macroeconomic and political changes have dominated over the role of NAFTA, partially undoing the changes in U.S. textile trade and production activities made in the early years of the agreement. The outcome of quantitative analysis identifies the significant, but negative effect, of NAFTA on the U.S. textile industry's profit performance in the early years of NAFTA, probably due to intensified import competition, fall of real output prices, and numerous mill closings. Overall, NAFTA is recognized as a short-term, transitional policy measure for the U.S. textile industry because of the limited importance of Mexico in U.S. textile trade, the short period of NAFTA implementation, and several dynamic environmental factors including exchange rate changes, U.S. signings of multiple regional trade agreements, and the emerging dominance of China in world textile trade under the phase-out of the Multi-fiber Arrangement that have changed international and domestic textile market competition. Ultimately, this study concludes that a trade policy is not likely to provide a long-term solution for the survival of U.S. textile industry. / Ph. D.

nÃo hà / This work aims to make an economic analysis of the Carbon Market, as a new international commerce that, each day, atracts new parts or investors, either to assume voluntary or imposed greenhouse effect gas reducion marks, or to especulate with this marketâs price variation and opportunity. Innitially there is a brief historic description of this market dawn, as well as the fundamental principles that leaded to its creation. The economic analysis itself begins with the suppliers and demandants exclusives characteristics, as well as the price formation in this market. The main objective of this research is, however, to study the negative effects, caused mainly by de excessive and not homogeneous taxing and positive effects that appears with the motivation that some internationals taxes offer to those who preffers the technological development other to the ordinary acquisition of international CREs. / Este trabalho procura realizar uma anÃlise econÃmica no Mercado de Carbono, como um novo setor de comÃrcio internacional que, a cada dia, atrai novos investidores ou participantes, seja assumindo metas obrigatÃrias ou voluntÃrias de reduÃÃo de emissÃes de gases de efeito estufa, seja para especular com a sua oscilaÃÃo de preÃos e oportunidades. Inicialmente conta-se com uma breve descriÃÃo histÃrica do surgimento desse mercado, bem como dos princÃpios basilares que levaram a sua criaÃÃo. A anÃlise econÃmica propriamente dita inicia-se com o estudo das caracterÃsticas exclusivas de seus ofertantes e demandantes, bem como da sua formaÃÃo de preÃo. O objetivo principal dessa pesquisa Ã, no entanto, estudar os efeitos negativos, causados principalmente pela cobranÃa excessiva e nÃo homogÃnea de impostos e efeitos positivos, que sÃo evidenciados no incentivo que alguns tributos supranacionais oferecem a quem prefere o desenvolvimento tecnolÃgico definitivo à aquisiÃÃo ordinÃria de RCEs internacionais..

Doctor of Philosophy / Department of Grain Science and Industry / Sajid Alavi / The Renewable Fuel Standard (RFS) in the Energy Independence and Security Act of 2007 has set the goal of 36 billion gallons of annual ethanol production in the U.S. by 2022, which is equivalent to 17.5% of the current gasoline consumption in the U.S. However, corn ethanol is expected to plateau at a level of 7.3% of current gasoline consumption on an energy-equivalent basis. Thus, it is essential to utilize a variety of substrates including lignocellulosic biomass from perennial energy crops such as switch grass, crop residues such as corn and sorghum stover, and agri-industrial co-products such as soybean hulls and wheat bran. Lignocellulosic substrates have a recalcitrant nature and require a pretreatment step that is critical for efficient enzymatic hydrolysis of cellulose and hemicellulose to fermentable sugars. In this study, soybean hulls were used as a model substrate for cellulosic ethanol. A novel thermo-mechanical pretreatment process using extrusion was investigated and compared with two traditional pretreatment methods, dilute acid and alkali hydrolysis, with regard to structural changes in the lignocellulosic substrate, and glucose and ethanol yields. The effect of extrusion parameters, such as barrel temperature, in-barrel moisture and screw speed, on glucose yield from soybean hulls was determined. Optimum processing conditions were screw speed of 350 rpm, maximum barrel temperature of 80C and 40% in-barrel moisture content, resulting in 95% cellulose conversion to glucose. Compared with untreated soybean hulls, the cellulose to glucose conversion of soybean hulls increased by 69.5, 128.4 and 132.2% for dilute acid, alkali and thermo-mechanical pretreatments, respectively. Glucose and other hexose sugars such as mannose and galactose were effectively fermented by Saccharomyces cerevisiae, resulting in ethanol yields of 13.04–15.44 g/L. Fermentation inhibitors glycerol, furfural, 5-(hydroxymethyl)-2-furaldehyde (HMF) and acetic acid were found in the thermo-mechanically pretreated substrate, ranging in concentrations from 0.072–0.431, 0–0.049, 0–0.023 and 0.181–0.278 g/L, respectively, which were lower than those reported from acid hydrolyzed substrates. The economic feasibility of commercial cellulosic ethanol production processes employing dilute acid hydrolysis and thermo-mechanical pretreatment were compared using a system dynamics modeling approach. It was concluded that low feedstock cost and high sugar conversion are important factors that can make cellulosic ethanol production commercially viable. Thermo-mechanical pretreatment was a more promising technology as compared to dilute acid hydrolysis because of the lower capital and operating costs, and higher sugar conversion.

Published Article / This study investigates the use of off-grid micro-hydrokinetic river system as a cost-effective and sustainable electricity supply option for remote rural residents in close proximity to flowing water and not having access to grid electricity. This hydrokinetic technology is still in the development stage and there is a lack of application especially in rural areas with reasonable water resource. This study will present the economic and environmental benefits of the proposed system. A mathematical model is developed to simulate the system performance as submitted to different solicitations. A test prototype will also be used in order to validate the simulation results.