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When a highly deformable elastic sphere impacts a water surface at an oblique angle it can skip several times in a manner similar to a skipping stone. However, this sphere seems to skip more readily and with more ease than a traditional skipping stone. This thesis examines the improved skipping characteristics of highly deformable elastic spheres made from cured silicone rubber. The effect of impact velocity, impact angle, sphere diamter and material shear modulus on ricochet trajectory is experimentally examined using high speed photography and image processing techniques. Experimental evaluation shows that deformation is the primary contributor to an increased lift force upon impact. An analytical model is presented in addition to a regime diagram predicting ricochet results from impact conditions.

More than ever before, engineers are creating products for developing countries. One of the purposes of these products is to improve the consumer's quality of life. Currently, there is no established method of measuring the social impact of these types of products. As a result, engineers have used their own metrics to assess their product's impact, if at all. Some of the common metrics used include products sold and revenue, which measure the financial success of a product without recognizing the social successes or failures it might have. In this thesis I introduce a potential metric, the Product Impact Metric (PIM), which quantifies the impact a product has on impoverished individuals -- especially those living in developing countries. It measures social impact broadly in five dimensions: health, education, standard of living, employment quality, and security. By measuring impact multidimensionally it captures both direct (having to do with the products main functions) and indirect impacts (not related to the products main functions), thereby revealing more about the products total impact than with other metrics. These indirect impacts can have a larger influence on the consumer than the direct impacts and are often left unmeasured. It is calculated based on 18 simple field measurements of the consumer. The Product Impact Metric can be used to predict social impact (using personas that represent real individuals) or measure social impact (using specific data from products introduced into the market). Despite its challenges, the measurement of a program or policies social impact is a common practice in the field of social sciences. This measurement is made through social impact indicators which are used to measure, predict, and improve potential social impacts. While there are clear benefits to predicting the social impact of a product, it is unclear how engineers are to select social impact indicators and build predictive models. This thesis introduces a method of selecting social impact indicators and creating predictive social impact models that can help engineers predict and improve the social impact of their product. First, an engineer identifies the product's users, objectives, and requirements. Then, the social impact categories that are related to the product are determined. From each of these categories, the engineer selects several social impact indicators. Finally, models are created for each indicator to predict how a product will change these indicators. The impact categories and indicators can be translated into product requirements and performance measures that can be used in product development processes. This method of predicting social impact is used on the proposed, expanded U.S. Mexico border wall.

This research project focuses on helping Hispanic students in the East Tennessee region excel in higher education with existing resources from various organizations. Hispanic high school students were identified to complete a survey. Findings showed that these students are facing legal, financial and social challenges when thinking about higher education. Even though these students are facing these challenges, they still want to pursue higher education in order to make a positive impact in their communities. The collective impact idea is proposed as part of the solution for this social complex problem. Since it is impossible for an individual to solve this alone, the goal is for these organizations to work together to help this population and their families. The conclusion of this project reminds us that data shows that the Hispanic population is growing in this region of Tennessee and that helping and educating this population is extremely important.

This dissertation outlines the study and development of a Solid-state Impact-ionization Multiplier (SIM). The SIM is a stand-alone current amplifier designed with optical detection systems in mind. The SIM amplifies signals utilizing impact ionization as a source of gain. The SIM is fabricated on silicon in order to take advantage of its favorable impact ionization coefficients. Utilizing silicon in impact ionization based gain devices makes low noise and high gains attainable. Because it is a stand-alone device, it can be wired to an arbitrary current source making it capable of receiving an input from photodiodes of any material. This makes it possible to amplify a signal from a photodiode that has been optimized for a given wavelength. In this way, the SIM attempts to separate the absorption and multiplication portions in modern day optical detection/amplification devices such as in Avalanche Photodiodes (APDs). This flexibility allows it to be utilized in many different systems. The SIM has gone through several iterations in the last few years. Each change has been with the purpose of increasing gain, frequency response or yield. The progression of the device has come at the hand of much thought, theory, simulation, fabrication, and testing. One of the challenges encountered in its development has been gain controllability due to poor carrier confinement and premature breakdown. Increased gain control was developed through simulation and fabrication of a confining oxide layer. Yield and difficulties in consistent fabrication were also addressed by altering the input metallization and doping processes. The frequency response of the device has been the largest challenge in device development. Issues such as space charge, floating node voltage, edge effects and low signal amplification have caused limitations. Successes and attempts at overcoming these, and other, challenges is the basis of this dissertation of work.

Nowadays, pressures on the environment are increasing around the world. In particular, Hong Kong, a compact city with a population of nearly seven million, one which has undergone remarkable economic growth over the past few decades, has developed severe environmental problems. It also has deficiencies in its taxation system: a small tax base, for example. In today’s world, “green” taxes have been accepted and applied by more and more countries, especially those in the OECD. However, Hong Kong still has not adequately used the tax tool as an integral part of the government’s anti-pollution strategy. Accordingly, the major objective of this study is to make proposals for improving the use of green tax measures in Hong Kong. The study first systematically introduces background theories of green tax and discusses its advantages and disadvantages. Then, it elaborates on the primary environmental problems in Hong Kong, followed by describing the green tax measures currently existing in the city. The thesis then summarizes and analyzes green tax measures in selected countries which are at the cutting edge of utilizing the tax tool as an integral part in their environmental policy, especially the Scandinavian nations. The study also conducts interviews with Government officials, green groups and those potentially in opposition to green tax. Finally, by drawing on the experiences of green tax measures in selected countries, proposals are made on improving existing green tax measures, introducing new environmental taxes, using the revenue from these taxes and dealing with implementation issues. The research findings of this project will help modernize as well as to green Hong Kong’s taxation system and thus eventually to improve the environment of Hong Kong.

Large investments in sparsely populated areas have the reputation to increase the attractiveness of these areas. This is said to lead to more investments, followed by growths in population, unemployment rates and tax revenues. Usually, city officials in Sweden trust in this formula and have the tendency to provide financial and other incentives for companies to start large investment projects in their towns (Hrelja, Isaksson, and Richardson, 2012). This thesis investigates the actual impact of such projects by the example of the large retail chain IKEA in Sweden. The development of three medium-sized cities in sparsely populated areas in Sweden which recently opened IKEA stores are compared to close-by cities and benchmark cities of a comparable size with respect to their unemployment rates, income, population, retail sales and trade indexes. The results will be used to predict the impact of the new IKEA store planned in Umeå.

Bee pollinators can thrive in highly urbanized environments if their preferred floral resources and habitat types are available. Enhanced pollinator habitats are being created globally, with a large local effort in Portland, Oregon. This project determined if we were providing the most preferred floral resources at enhanced pollinator sites for bees, if floral resources were available throughout the season, and if differences in dietary preferences between native and honey bees would allow for the identification of "native bee floral resources" in South East Portland. Bee pollinators were monitored from June to August at three enhanced pollinator sites in South East Portland, Oregon. A total of 566 individual bees were observed, tiny dark bees and bumblebees composed the large majority of the urban bee composition. Vegetation metrics and bee presence were correlated using a Generalized Linear Mixed Model and significant variables that predicted bee presence included Solidago canadenisis (p-value 0.0024), density of floral resources (p-value

This thesis is an attempt to evaluate quantitatively as well as qualitatively possible future developments in international trade of oranges and tangerines, and the possible impact of these developments on the export of oranges and tangerines by Israel. After World War II, international trade in oranges and tangerines increased rapidly, mostly as a result of the rapid rise in standards of living and the improvements in diet habits which took place in many countries at that time. These favorable marketing conditions encouraged the planting of new groves in the citrus growing areas of the world and particularly those of the Mediterranean countries.

Educational attainment in the United States is at the highest levels since recording started, yet large numbers of students are not completing education at the secondary and postsecondary levels. This lack of education impacts their long-term prospects for living wage careers, stable housing and the ability to support both themselves and their families. A growing response to this crisis is the development of cross-sector collaborative partnerships to address educational attainment resulting in an educated and skilled workforce that will ultimately improve prosperity in a community or region. This collaborative work has expanded as a result of growing recognition that all sectors of the economy have a stake in education as a way to create strong communities and regional prosperity. While evidence of the challenges in educating all students abounds, evidence of success in collaborative partnership efforts to improve education is sparse. This constructivist grounded theory research study was developed to explore the collaborative behaviors leading to success in improving educational outcomes for all students. Leaders at the executive and operational levels of collaborative partnerships participated in this study through a three-phase process of semi-structured interviews. Data collection and analysis for this study used a process of constant comparison and occurred simultaneously with a comprehensive literature review. Participants in this research study represented collaborative partnerships from across the United States that are focused on improving educational attainment at the secondary and postsecondary levels. Four findings from this research study support an overarching substantive grounded theory that explicates the importance of moral purpose as the underpinning for achievement of collaborative outcomes. The findings further describe the behaviors necessary for success in crafting strong relationships, building trust, and communicating for impact. These interpersonal behaviors can be supported by the presence of psychological safety at the group level to maximize the efficacy of collaborative partnerships to achieve systems improvements in education. This study also encourages all collaborative partnerships to consider using a continuous improvement approach to their work grounded in intellectual humility. The study concludes with recommendations for future research to further explore the implications of psychological safety in the context of collaborative partnerships, noting that both intellectual humility and curiosity are aligned with the concepts of psychological safety and continuous improvement or improvement science.