Electronic Theses, Dissertations, and Reports

DETERMINANTS OF MAIZE MARKETING DECISIONS FOR SMALLHOLDER HOUSEHOLDS IN TANZANIA

Tue, 21 May 2013 00:00:00 GMT

DETERMINANTS OF MAIZE MARKETING DECISIONS FOR SMALLHOLDER HOUSEHOLDS IN TANZANIA Lowe, Caitlin Heather Smallholder farmers in Tanzania remain susceptible to food insecurity and poverty. To combat these challenges, the country and development organizations have turned to agriculture. In particular, value chains have been identified as a point of interest. Specifically, the maize value chain is of critical importance since maize is the staple crop of the country as well as the staple carbohydrate in the Tanzanian diet. Markets are beneficial because they enable households to specialize in agricultural production according to their comparative advantage. Specifically, markets have been shown to be one tool for increasing welfare, measured through the proxy income. The objective of this thesis is to identify the determinants of a household’s decision to participate in the maize market as well as identify the determinants of a household’s decision regarding how much maize to sell in a given market. This research examines formal and informal market participation among 908 households during the 2008 long rainy season. Probit models were estimated to determine market participation for the formal, informal, and aggregate sale market levels. A Heckman OLS model was used to further analyze the value sold by the household in a given market. Econometric results indicate that “quantity harvested” positively and significantly impacts market participation decisions as well as value sold decisions. The variable “male-headed households” was positive and significant in the formal market while the variable showed no significant impact in the informal market participation model. Both “radio ownership” and “mobile telephone ownership” proved to be positive and significant in the formal model while only the ownership of a radio was significant in the informal market. Additionally it was found that for the formal market participation decision, “bicycle ownership” was positive and significant. Overall, it appears that households participate in the informal market as a way to meet cash needs since farmers were not price-responsive. However, in the formal market farmers were found to be very price-responsive, following neo-classical economic theory.

FLOW AS A POSITIVE STATE: ANTECEDENTS AND OUTCOMES OF FLOW STATES

Tue, 21 May 2013 00:00:00 GMT

FLOW AS A POSITIVE STATE: ANTECEDENTS AND OUTCOMES OF FLOW STATES van Ittersum, Kyle The field of Industrial/Organizational Psychology has begun to incorporate elements from the growing field of Positive Psychology which has been manifest in Positive Organizational Scholarship (POS) and Positive Organizational Behavior (POB). This study examined two POB constructs, Psychological Capital (PsyCap) and Flow in a lab-based virtual-world simulation while utilizing Fredrickson’s (2001) broaden-and-build theory of positive emotions. It was hypothesized that PsyCap would predict flow experiences and that those flow experiences would predict several outcomes, namely performance, affect, and resilience. It was found that individuals higher in Psychological Capital tended to experience more flow in a flow inducing task. During that task, individuals in flow performed better and experienced more positive affect than individuals who experienced lower levels of flow. Additionally, flow in that task was able to predict performance, affect, and resilience in a later, overly challenging task. Implications for these findings are discussed as well as limitations and future directions.

BEST PRACTICES FOR DESIGNING AND PLANNING EVENTS WHERE HUMAN-ANIMAL INTERACTIONS ARE ENCOURAGED, BASED ON OBSERVATIONS OF RISK BEHAVIORS AND HAND HYGIENE AT SUCH EVENTS

Thu, 16 May 2013 00:00:00 GMT

BEST PRACTICES FOR DESIGNING AND PLANNING EVENTS WHERE HUMAN-ANIMAL INTERACTIONS ARE ENCOURAGED, BASED ON OBSERVATIONS OF RISK BEHAVIORS AND HAND HYGIENE AT SUCH EVENTS Erdozain, Gonzalo Outbreaks of human illness have been linked to visiting settings with animal contact throughout developed countries. These outbreaks demonstrate that although contact with animals in public settings can provide educational and entertainment opportunities, the potential to spread disease exists if risk-reduction tools are not implemented, proper hygiene measures aren’t practiced, and precautions are not taken and reinforced. This thesis is divided into two parts. Part one is an observational study of hand hygiene tool availability and recommendations; frequency of risky behavior; and, handwashing attempts by visitors in Kansas and Missouri, U.S., petting zoos. Part two delineates best practices for organizing events where human-animal interactions are encouraged, in hopes it will lower the risk of zoonotic disease transmission. Handwashing signs and hand hygiene stations were available at the exit of animal-contact areas in 10/13 and 8/13 petting zoos respectively. Risky behaviors were observed being performed at all petting zoos by at least one visitor. Frequently observed behaviors were: children (10/13 petting zoos) and adults (9/13 petting zoos) touching hands to face within animal-contact areas; animals licking children’s and adults’ hands (7/13 and 4/13 petting zoos, respectively); and children and adults drinking within animal-contact areas (5/13 petting zoos each). Of 574 visitors observed for hand hygiene when exiting animal-contact areas, 37% (n=214) of individuals attempted some type of hand hygiene, with male adults, female adults, and children attempting at similar rates (32%, 40%, and 37% respectively). Visitors performed hand hygiene more often when a staff member was present within or at the exit to the animal-contact area (136/231, 59%) than when no staff member was present (78/343, 23%; P < 0.001, OR = 4.863, 95% CI = 3.380–6.998), and in petting zoos where animal contact occurred over a fence (188/460, 40.9%) as opposed to visitors entering an animals’ yard for contact (26/114, 22.8%; P < 0.001, OR = 2.339, 95% CI = 1.454–3.763). Inconsistencies existed in tool availability, signage, and supervision of animal- contact. Risk communication was poor, with few petting zoos outlining risks associated with animal-contact, or providing recommendations for precautions to be taken to reduce these risks. Recommendations made in the second part of this thesis were based on these observations, recent publications, and the suggestions of many health agencies. It focuses on what event planners can do to design and plan a safer event, and what staff working at the event should be aware of in order to inform visitors and lower the risk of zoonotic disease transmission. Part two discusses two primary tools to reduce risk of zoonotic disease transmission: sanitation and awareness of risk behaviors. Keeping facilities, animals, and visitors clean, and informing visitors of risky behaviors to avoid, while reinforcing positive messages within the animal- contact area, can lower the risk of zoonotic infection. Included with the second part, is a checklist (see appendix A) designed for visitors to assess whether an event that encourages human-animal interaction poses a high or low risk. By identifying possible risk factors, teachers and parents will be able to make an informed decision about the safety of the human-animal encounter.

SELF-ASSEMBLED THIN POLYMER FILM USED FOR SENSING APPLICATION

Wed, 15 May 2013 00:00:00 GMT

SELF-ASSEMBLED THIN POLYMER FILM USED FOR SENSING APPLICATION Li, Feng Polymer thin films have played an important role in our everyday lives ranging from industrial to biomedical applications. In this thesis, two major topics based on polymer thin films including photopolymerized self-assembled monolayer and nanoporous thin films derived from diblock copolymer are discussed. In the first part of this thesis, a well-packed self-assembled monolayer with phosphonic acid as head group and diacetylenic functional group in the tail formed on AlGaN/GaN surface. According to water contact angle and UV/Vis absorption spectroscopy data, the stability of this self assembled monolayer on oxidized AlGaN/ GaN surface can be improved by photopolymerization of SAMs. The photopolymerization efficiency of the SAMs is effected by the position of polymerization functional group in the alkyl chain. In the second part of this thesis, PS-b-PMMA diblock copolymer thin films were prepared, characterized and applied as a template for electron transfer efficiency determination. The surface COOH group in nanoporous thin films derived from PS-b-PMMA were modified with ferrocene redox moieties having different linker lengths in the organic phase. The surface functionalization efficiency was quantitatively assessed by measuring the monovalent probe cations released from the surface COOH groups via cation-exchange processes using highly- sensitive analytical techniques including spectrofluorometry and inductively coupled plasma mass spectrometry (ICP-MS). The surface coverage of the redox moieties is an important parameter to determine the electron hopping efficiency. The electron propagation resulted from electron hopping across relatively large spacing that was controlled by the motion of anchored redox sites. The longer linker led to the larger physical displacement range of anchored ferrocene moieties, facilitating the approach of the adjacent ferrocene moieties within a distance required for electron self-exchange reaction. Faradic currents originating from redox-involved electron hopping through the ferrocene moieties anchored onto the insulator surface decreased with increasing the concentration of beta-cyclodextrin (β-CD) in aqueous solution. The current could be recovered by adding redox-inactive guest molecules of β-CD to the solution.