Farmers will supply the raw ingredients for the emerging cellulosic ethanol industry. The long-term relationship between a farmer and a processing firm is expected to be contractual. A processing firm has an incentive to sign long-term contracts to ensure a cost-efficient level of raw ingredient supply. However, farmers generally prefer to operate with either no contract or a short-term contract in order to maintain options for adjustments in future acreage allocations due to changes in relative prices. Of interest in this research is to understand the incentives of farmers and calculating the efficient level of the “inflexibility premium”, which a processing firm must provide to a farmer when a long term contract is signed. A stochastic dynamic programming model is solved and with the help of Microsoft Excel numerically evaluated to illustrate the marginal inflexibility premium is increasing with contract length and the level of price variability, and is decreasing with the size of acreage adjustment costs.

Farmers will supply the raw ingredients for the emerging cellulosic ethanol industry. The long-term relationship between a farmer and a processing firm is expected to be contractual. A processing firm has an incentive to sign long-term contracts to ensure a cost-efficient level of raw ingredient supply. However, farmers generally prefer to operate with either no contract or a short-term contract in order to maintain options for adjustments in future acreage allocations due to changes in relative prices. Of interest in this research is to understand the incentives of farmers and calculating the efficient level of the “inflexibility premium”, which a processing firm must provide to a farmer when a long term contract is signed. A stochastic dynamic programming model is solved and with the help of Microsoft Excel numerically evaluated to illustrate the marginal inflexibility premium is increasing with contract length and the level of price variability, and is decreasing with the size of acreage adjustment costs.

Farmers will supply the raw ingredients for the emerging cellulosic ethanol industry. The long-term relationship between a farmer and a processing firm is expected to be contractual. A processing firm has an incentive to sign long-term contracts to ensure a cost-efficient level of raw ingredient supply. However, farmers generally prefer to operate with either no contract or a short-term contract in order to maintain options for adjustments in future acreage allocations due to changes in relative prices. Of interest in this research is to understand the incentives of farmers and calculating the efficient level of the “inflexibility premium”, which a processing firm must provide to a farmer when a long term contract is signed. A stochastic dynamic programming model is solved and with the help of Microsoft Excel numerically evaluated to illustrate the marginal inflexibility premium is increasing with contract length and the level of price variability, and is decreasing with the size of acreage adjustment costs. / Land and Food Systems, Faculty of / Graduate

Unpaid carers are known to be at heightened risk of poor outcomes (e.g. financially, physically and emotionally). Conversely it is known that carers can have positive experiences through their caring role and continue to experience good well-being even when distress is present. The study proposes that mindfulness, psychological inflexibility and valued living may moderate the relationship between distress and well-being in carers and therefore help ameliorate some of the potentially negative consequences of caring.

The proposed diagnostic criteria for Hypersexual Disorder included "[r]epetitively engaging in sexual fantasies, urges, or behaviors in response to stressful life events" (Kafka, 2010, p.279) as a symptom, although no data demonstrates a causal relationship between stress and hypersexual behavior. We sought to confirm previous findings while furthering the field's understanding of this relationship by being the first study to assess stress and hypersexual behavior across multiple time points. Specifically, we sought to test three hypotheses within a sample of men seeking treatment for hypersexual behavior: 1) hypersexual individuals report higher stress levels than published norm samples; 2) stress predicts sexual thoughts, urges, and behavior at the same time point and across multiple time points; and 3) among various domains of stress, social and personal forms of stress best predict hypersexual behavior. Thirty men seeking treatment for hypersexual behaviors at residential and intensive outpatient treatment centers participated in the study. Various indices of stress (perceived stress, daily hassles, stressful life domains, and salivary cortisol), affect (boredom, psychological distress, depression, anxiety, alexithymia, and loneliness), and process (psychological inflexibility) were assessed, some across two time points. Across multiple analyses, the study did not find sufficient evidence to support a causal relationship between stress and hypersexual behavior. Supporting previous research, the hypersexual sample demonstrated significant elevations on stress, affect, and process measures compared to published norms, strengthening the assertion that hypersexual individuals experience high levels of stress and psychological distress. The implications of these findings, limitations of the methods used, and future directions for research and treatment are discussed.

The relationship between perfectionism and religiosity is clarified when the adaptive and maladaptive dimensions of both constructs are compared. Literature in both areas implicates the idea of a rigid and inflexible personality style as a possible mediator in the relationship. This investigation examined the relationship of perfectionism and religiosity, using adaptive and maladaptive dimensions, as mediated by psychological inflexibility. Measures of perfectionism, religiosity, and psychological inflexibility were given to 376 undergraduate college students in an anonymous online survey. Adaptive perfectionism was found to be significantly correlated with adaptive religiosity. Maladaptive perfectionism was found to be significantly correlated with maladaptive religiosity. Psychological inflexibility was found to be significantly correlated with the maladaptive dimensions of both perfectionism and religiosity. It was also shown to mediate the relationship between maladaptive religiosity and maladaptive perfectionism using the test of mediation proposed by Baron and Kenny. Implications and future directions are discussed.

Sexual trauma is linked to adverse health outcomes (e.g., D’Andre et al., 2011). Given the negative sequelae of sexual trauma, exploration of factors that influence the relation between sexual trauma and health outcomes is crucial. Current literature suggests that psychological flexibility and inflexibility may be factors in promotion of individuals’ health or pathology (e.g., Gloster et al., 2017). The current study sought to explore the variability in psychological flexibility and inflexibility among participants and the potential moderating effects of psychological flexibility and inflexibility on the relation between sexual trauma and both mental and physical health outcomes. Moderation analyses failed to support significant moderation effect of psychological flexibility on either physical or mental health outcomes. However, psychological inflexibility did significantly moderate the relationship between sexual trauma and emotional wellbeing b = 5.50 t(247) = 2.69 p < 0.01 such that sexual trauma significantly predicts worse emotional wellbeing at high levels of psychological inflexibility. Similarly, in the model examining the potential moderating effect of psychological inflexibility on the relationship between sexual trauma and physical functioning, the interaction was significant, b = 7.51 t(248) = 2.13, p < 0.05, suggesting possible moderation. However, after further probing, psychological inflexibility did not significantly moderate the relationship between sexual trauma and physical functioning at any level. Additionally, t-test results suggest that regardless of a sexual trauma history, participants do not significantly differ in their levels of psychological flexibility or inflexibility. However, within moderation models both psychological flexibility and psychological inflexibility predicted physical and mental health outcomes, further supporting the association between resiliency and psychological flexibility and the link between inflexibility and worsened health outcomes. Findings suggest that interventions that promote psychological flexibility and target inflexibility may be important health promotion factors among both survivors of sexual trauma and non-traumatized populations.

Insulin resistance (IR) is considered to be an important factor influencing the progression of atherosclerosis and is associated with higher morbidity and mortality. IR is a common feature of diabetes mellitus Type 2 and obesity. Many authors consider IR being the crucial abnormality of the metabolic syndrome which is characterized by the essential hypertension, hyperliproteinemia, visceral obesity, endothel dysfunction and many other abnormalities. Impaired insulin action (IR) is also described in diabetes mellitus Type 1, however this phenomenon has not been fully explained. The subjects of dissertation thesis was directed on the IR importance in diabetic Type 1 patients as well as on the renin angiotensin system inhibition in patients with IR and metabolic syndrome with impaired glucose homeostasis. Hyperinsulinemic euglycemic clamp is used in combination with indirect calorimetry to estimate the IR in vivo in humans. In our project we focused on a) the existence of the metabolic inflexibility phenomenon in type 1 diabetic patients b) the methodological evaluation of the hyperinsulinemic euglycemic clamp procedure in the same group c) the influence of renin angiotensin system inhibition with angiotensin II type 1 receptor inhibitor telmisartan in patients with metabolic syndrome and impaired glucose...

Clinical perfectionism is characterized by rigidly pursuing unrealistically high standards on which self-worth is contingent and experiencing distress when these standards are not met. Because clinical perfectionism is associated with many psychological diagnoses, understanding how to treat it may help streamline available treatments. The aim of this dissertation was to test the effect of acceptance and commitment therapy (ACT), a cognitive-behavioral therapy, on 53 individuals with clinical perfectionism. Participants in the ACT group received 10 therapy sessions and those in the control group were on a waitlist for 14 weeks. The first study supported the effectiveness of ACT relative to the waitlist control group with respect to perfectionism severity, quality of life, and general symptom distress. The second study showed changes in psychological inflexibility and self-compassion explained improvements in quality of life and concern over mistakes, respectively. It also found a variable effect of baseline psychological inflexibility on response to treatment depending on the outcome tested. In contrast, average self-compassion was generally associated with better outcomes in ACT. Neurological results from the third study suggest receiving ACT was associated with greater cognitive efficiency while performing error-prone tasks and decreased responsivity to emotionally meaningful stimuli. In addition, changes in brain activation were not linked to changes in self-report outcomes. Collectively, this dissertation examined not only the efficacy of an intervention focused on a maladaptive behavioral pattern like clinical perfectionism but also how and for whom such a therapy works.

Insulin resistance (IR) is considered to be an important factor influencing the progression of atherosclerosis and is associated with higher morbidity and mortality. IR is a common feature of diabetes mellitus Type 2 and obesity. Many authors consider IR being the crucial abnormality of the metabolic syndrome which is characterized by the essential hypertension, hyperliproteinemia, visceral obesity, endothel dysfunction and many other abnormalities. Impaired insulin action (IR) is also described in diabetes mellitus Type 1, however this phenomenon has not been fully explained. The subjects of dissertation thesis was directed on the IR importance in diabetic Type 1 patients as well as on the renin angiotensin system inhibition in patients with IR and metabolic syndrome with impaired glucose homeostasis. Hyperinsulinemic euglycemic clamp is used in combination with indirect calorimetry to estimate the IR in vivo in humans. In our project we focused on a) the existence of the metabolic inflexibility phenomenon in type 1 diabetic patients b) the methodological evaluation of the hyperinsulinemic euglycemic clamp procedure in the same group c) the influence of renin angiotensin system inhibition with angiotensin II type 1 receptor inhibitor telmisartan in patients with metabolic syndrome and impaired glucose...