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Effect of leg muscle fatigue on the contributions of the somatosensory, visual, and vestibular systems to balanceKorioukhina, Maia O. 28 April 2003 (has links)
Objectives: To evaluate the effect of leg muscle fatigue on balance and to
determine the contributions of the somatosensory, visual, and vestibular systems to
balance of apparently healthy males and females. Design: Forty-two subjects were
randomly assigned to either the experimental or control groups and then
subdivided based on gender resulting in four groups (10 men/women in the
experimental groups and 11 men/women in the control groups). Each subject was
pre-tested on the Sensory Organization Test assessment of balance. Subjects in the
experimental group then underwent a Wingate Anaerobic Test to induce leg
fatigue. Following the Wingate Test subjects were post-tested on the Sensory
Organization Test. Subjects in the control group rested quietly for a period of
seven minutes prior to post-testing. Subjects: Forty-two volunteers without recent
or chronic history of lower extremity injury, neurological deficits, or balance
problems participated. Main outcome measures: Ratios for the use of the
somatosensory, visual, and vestibular systems and the Composite Score were
calculated. A [2(Group) x 2(Gender) x 2(Test)] mixed design ANOVA was used
to analyze each of the dependent variables. Results: Analysis of Composite Score
demonstrated a significant Group x Test interaction (p<0.010). The breakdown of
the interaction showed no significant Test effect (p-value 0.341) for the
experimental group. However, there was a significant Test effect (p-value<0.010)
for the control group. There were no significant effects of fatigue on
somatosensory system ratio. The analysis of the visual system ratio revealed a
significant main effect (p-value 0.022) for Group. Analysis of vestibular system
ratio revealed a significant main effect for Test (p<0.010). Conclusions: As
demonstrated by the results of the present experiment, leg muscular fatigue is
associated with significantly decreased balance. In addition, fatigue does appear to
have an effect on the utilization of visual and vestibular systems. / Graduation date: 2003
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Efficiency and redistribution in economies with hidden actionPanaccione, Luca 05 September 2006 (has links)
In this thesis, we study how the efficiency of competitive equilibrium in a pure exchange economy with hidden action depends on the market structure. We consider both competitive anonymous markets, where consumers make their choices taking as given some relevant economic parameters, and competitive strategic markets, where consumers interact with financial intermediaries who explicitly take into account the choices of other economic agents. In the first chapter, we review some known results on the efficiency of competitive equilibrium under different market structures. In the second chapter, we assume that there are multiple consumption goods and that the level of action affects the marginal benefit consumers get from consumption. We consider two different market structures: a complete set of contingent-commodity markets, and a complete set of financial markets, together with spot markets for consumption goods. The main result we provide in this chapter is that under more general hypothesis than those usually considered in the literature, the equilibrium with financial markets is not efficient. In the third chapter, we assume that consumers can insure themselves by voluntarily committing to deliver part of their endowment to a common pool in exchange for a sure return from the pool itself. We show that an equilibrium with pool of promises exists, and we characterize it.
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Changes in dynamic balance in multiple sclerosis patients as related to the severity of disease and self-rated fatigueMiller, Caralynne M. January 2006 (has links)
Thesis (M.S.)--University of Delaware, 2006. / Principal faculty advisor: James G. Richards, College of Health Sciences. Includes bibliographical references.
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Recovery of motor and cognitive function following concussion /Parker, Tonya Moreland, January 2006 (has links)
Thesis (Ph. D.)--University of Oregon, 2006. / Typescript. Includes vita and abstract. Includes bibliographical references (leaves 113-119). Also available for download via the World Wide Web; free to University of Oregon users.
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Efficiency and redistribution in economies with hidden actionPanaccione, Luca 05 September 2006 (has links)
In this thesis, we study how the efficiency of competitive equilibrium in a pure exchange economy with hidden action depends on the market structure. We consider both competitive anonymous markets, where consumers make their choices taking as given some relevant economic parameters, and competitive strategic markets, where consumers interact with financial intermediaries who explicitly take into account the choices of other economic agents. In the first chapter, we review some known results on the efficiency of competitive equilibrium under different market structures. In the second chapter, we assume that there are multiple consumption goods and that the level of action affects the marginal benefit consumers get from consumption. We consider two different market structures: a complete set of contingent-commodity markets, and a complete set of financial markets, together with spot markets for consumption goods. The main result we provide in this chapter is that under more general hypothesis than those usually considered in the literature, the equilibrium with financial markets is not efficient. In the third chapter, we assume that consumers can insure themselves by voluntarily committing to deliver part of their endowment to a common pool in exchange for a sure return from the pool itself. We show that an equilibrium with pool of promises exists, and we characterize it.
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Essays on the inventory theory of money demandLi, Chen 05 1900 (has links)
The goal of this dissertation is to examine the theoretical and empirical implications of the inventory theoretic approach to the demand for money.
Chapter 1 reviews the existing inventory theoretic frameworks and empirical money demand literature and provides an overview of this thesis. One of the main conclusions is that the elasticity results from the existing inventory theoretic models are not robust.
Chapter 2 develops a partial equilibrium inventory theoretic model, in which a fixed cost is involved per cash transfer. The key feature is that a firm endogenously chooses the frequency of pay periods, which a household takes as given. When the firm must borrow working capital and pay wages by cheque, I show that both the firm and the household choose to transfer cash every payday only. The model keeps the basic result from the classical inventory theoretic approach that both the income and interest elasticity of money demand are 0.5.
Chapter 3 extends the partial equilibrium model into a general equilibrium framework and shows that the partial equilibrium elasticity results no longer apply in the general equilibrium. First, the income elasticity is 1 in the general equilibrium. Second, the interest elasticity has two values depending on a threshold interest rate. When interest rates are below this threshold, the model is the Cash-In-Advance model with a constant income velocity of money and zero interest elasticity; otherwise the interest elasticity is close to 0.5 and the velocity fluctuates in response to variations in interest rates. Finally, the general equilibrium elasticity results are robust across alternative specifications of the agent's utility.
Chapter 4 calibrates the general equilibrium model to the last 40 years of US data for M1. By constructing a residual measure of money transaction costs from the structural money demand function, I find that a structural break in the transaction costs occurred in 1981 might have been responsible for the instability of long-run money demand. The benefit of this approach is that it can explain this pattern of money demand without appealing to an exogenous structural break in the money demand function.
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Multiphase flow and chemical reactor thermodynamics for hydrolysis and thermochemical productionPope, Kevin 01 August 2012 (has links)
Current techniques of hydrogen production (primarily reformation of fossil fuels) are
unsustainable, releasing CO2 into the atmosphere, as well as consuming limited reserves
of fossil fuels. The copper-chlorine cycle is a promising thermochemical process which
can cost-effectively produce hydrogen with less environmental impact. In this thesis, new
predictive formulations and experimental data are presented to improve the conversion
extent and reaction rates of the hydrolysis reactor in the Cu-Cl cycle. This reactor has
critical implications for the design, operation, and efficiency of the Cu-Cl cycle and
hydrogen production. The relatively high temperature needed to drive the reaction
requires a significant input of thermal energy. This thesis focuses on methods and
analysis to reduce the unreacted steam in the hydrolysis reactor, in order to reduce the
thermal energy input and improve the cycle’s thermal efficiency. A key outcome from
this thesis is the experimental verification of reducing the steam to copper chloride ratio
from 16:1 (past studies) to about 3:1. The results of this thesis provide key new data to
design a more efficient hydrolysis reactor that can be effectively integrated within the
Cu-Cl cycle. / UOIT
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Molecular reorientation of some fatty acids when in contact with water.Yiannos, Peter N. 01 January 1960 (has links)
No description available.
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The impacts of improving Brazil's transportation infrastructure on the world soybean marketCosta, Rafael de Farias 15 May 2009 (has links)
The lack of adequate transportation infrastructure in Brazil has been a bottleneck for the
soybean producers for many years. Moreover, the costly inland transportation incurred
from this bottleneck has resulted in a loss in competitiveness for Brazil compared to
other exporting countries, especially the United States. If transportation costs are
reduced by introducing improved infrastructure, Brazil is expected to increase its
competitiveness in the world soybean market by increasing its exports and producer
revenues. On the other hand, the United States and other significant soybean competing
exporting countries are expected to lose market share as well as producer revenues.
This study uses a spatial equilibrium model to analyze transportation
infrastructure improvements proposed by the Brazilian government vis-à-vis enhance the
nation’s soybean transportation network. The analyzed transportation improvements are:
(i) the development of the Tapajós-Teles Pires waterway; (ii) the completion of the BR-
163 highway; (iii) the construction of the Mortes-Araguaia waterway; (iv) the Ferronorte
railroad expansion to Rondonópolis and the linkage between the city of Rio Verde to
Uberlândia; and (v) the Ferropar railroad expansion to the city of Dourados. The model
specifies the Brazilian inland transportation network and the international ocean shipments. The model divides Brazil into 18 excess supply regions and 8 excess demand
regions. The competing exporting countries are the United States, Argentina, Rest of
South America (Bolivia, Paraguay, and Uruguay), Canada, and India. The importing
countries are composed of China, European Union, Southeast Asia, Mexico, and the
Rest of the World.
Results suggest these proposed transportation improvements yield potential
noteworthy gains to Brazil with producer revenues increasing more than $500 million
and exports increasing by 177 thousand metric tons. Consequently, the world soybean
price declines by $1.16 per metric ton and producer revenues and exports in the United
States fall by 63 thousand metric tons and $104.89 million, respectively. Although the
absolute gains in price, revenues, and exports for Brazil are considerable, they only
represent in relative changes 1.48, 2.35, and 0.32 percent, respectively. Similarly, the
loss in price, revenue, and export value for the United States is also low, declining by
0.23, 0.23, and 0.12 percent, respectively.
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The impacts of improving Brazil's transportation infrastructure on the world soybean marketCosta, Rafael de Farias 10 October 2008 (has links)
The lack of adequate transportation infrastructure in Brazil has been a bottleneck for the
soybean producers for many years. Moreover, the costly inland transportation incurred
from this bottleneck has resulted in a loss in competitiveness for Brazil compared to
other exporting countries, especially the United States. If transportation costs are
reduced by introducing improved infrastructure, Brazil is expected to increase its
competitiveness in the world soybean market by increasing its exports and producer
revenues. On the other hand, the United States and other significant soybean competing
exporting countries are expected to lose market share as well as producer revenues.
This study uses a spatial equilibrium model to analyze transportation
infrastructure improvements proposed by the Brazilian government vis-à-vis enhance the
nation's soybean transportation network. The analyzed transportation improvements are:
(i) the development of the Tapajós-Teles Pires waterway; (ii) the completion of the BR-
163 highway; (iii) the construction of the Mortes-Araguaia waterway; (iv) the Ferronorte
railroad expansion to Rondonópolis and the linkage between the city of Rio Verde to
Uberlândia; and (v) the Ferropar railroad expansion to the city of Dourados. The model
specifies the Brazilian inland transportation network and the international ocean shipments. The model divides Brazil into 18 excess supply regions and 8 excess demand
regions. The competing exporting countries are the United States, Argentina, Rest of
South America (Bolivia, Paraguay, and Uruguay), Canada, and India. The importing
countries are composed of China, European Union, Southeast Asia, Mexico, and the
Rest of the World.
Results suggest these proposed transportation improvements yield potential
noteworthy gains to Brazil with producer revenues increasing more than $500 million
and exports increasing by 177 thousand metric tons. Consequently, the world soybean
price declines by $1.16 per metric ton and producer revenues and exports in the United
States fall by 63 thousand metric tons and $104.89 million, respectively. Although the
absolute gains in price, revenues, and exports for Brazil are considerable, they only
represent in relative changes 1.48, 2.35, and 0.32 percent, respectively. Similarly, the
loss in price, revenue, and export value for the United States is also low, declining by
0.23, 0.23, and 0.12 percent, respectively.
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