The inadvertent spread of exotic pests and pathogens has resulted in devastating losses for bees. The vast majority of bee disease research has focused on a single species of managed bee, the European honey bee (Apis mellifera). More recently, pathogen spillover from managed bees is implicated in the decline of several bumble bee species (Bombus spp.) demonstrating a need to better understand the mechanisms driving disease prevalence in bees, transmission routes, and spillover events. RNA viruses, once considered specific to honey bees, are suspected of spilling over from managed honey bees into wild bumble bee populations. To test this, I collected bees and flowers in the field from areas with and without honey bee apiaries nearby. Prevalence of deformed wing virus (DWV) and black queen cell virus (BQCV) as well as replicating DWV infections in Bombus vagans and B. bimaculatus were highest in bumble bees collected near honey bee apiaries (χ 12 < 6.531, P < 0.05). My results suggest that honey bees are significant contributors of viruses to bumble bees. Flowers have been suspected as bridges in virus transmission among bees. I detected bee viruses on 18% of the flowers collected within honey bee apiaries and detected no virus on flowers in areas without apiaries, thus providing evidence that viruses are transmitted at flowers from infected honey bees. In controlled experiments using captive colonies in flight cages, I found that honey bees leave viruses on flowers but not equally across plant species. My results suggest that there are differences in virus ecology mediated by floral morphology and/or pollinator behavior. No bumble bees became infected in controlled experiments, indicating that virus transmission through plants is a rare event that is likely to require repeated exposure. The few studies examining viruses in bumble bees are generally limited to virus detection, resulting in little understanding of the conditions affecting virus titers. In honeybees, infections may remain latent, capable of replicating under certain conditions, such as immunosuppression induced by pesticide exposure. I tested whether exposure to imidacloprid, a neonicotinoid pesticide, affects virus titers in bumble bees. In previous honey bee studies, imidacloprid exposure increased virus titers. In contrast, I found that bumble bee exposure to imidacloprid decreased BQCV and DWV titers (χ42 < 20.873, p < 0.02). My findings suggest that virus-pesticide interactions are species-specific and results from honey bee studies should not be generalized across other bee species. Having found that honey bees are significant contributors of viruses to wild bees and flowers, I investigated how honey bee management practices affect disease spread and developed recommendations and tools to lesson the risk of spillover events. Honey bee disease may be exacerbated by migratory beekeeping which increases stress and opportunities for disease transmission. I experimentally tested whether migratory conditions contribute to disease spread in honey bees and found negative yet varying effects on bees suggesting that the effects of migratory practices may be ameliorated with rest time between pollination events. State apiary inspection programs are critical to controlling disease spread and reducing the risk of spillover. However, these programs are often resource constrained. I developed and deployed a toolkit that enables state programs to prioritize inspections and provide a platform for beekeeper education. Using novel data collected in Vermont, I discovered several promising avenues for future research and provided realistic recommendations to improve bee health.

Interparental conflict has been shown to be associated with child psychopathology (internalizing and externalizing behaviors). Adolescents are at risk for developing internalizing and externalizing behaviors because they are aware of the implications of the interparental conflict, they can attempt to mediate the conflict, and because of age-related responsibilities, they often experience new and unfamiliar stressors. A comprehensive review of the literature revealed four mediational models with substantial empirical support that explain the relation between interparental conflict and adolescent psychopathology: the cognitive-contextual model, the triangulation model, the spillover model, and the interparental conflict-parental psychopathology model. Typically, the mediators of these models (self-blame/perceived threat; triangulation; negative parenting behaviors; parental psychopathology, respectively) have been examined individually. The aim of this study was threefold: 1) examine the specificity of adolescent psychopathology (dimension versus diagnosis), 2) test each theoretical model, and 3) develop and test an integrative model that included the mediational mechanisms from the individual models. A community sample of 152 families (mother, father, adolescent) was recruited from the contiguous United States. Considering specific psychiatric diagnoses did not improve the fit of models that included the respective adolescent dimensional internalizing or externalizing behaviors. The hypotheses of the cognitive-contextual model (mediator: perceived threat), spillover model (mediators: maternal/paternal parenting), and the interparental conflict-parental psychopathology model (mediators: maternal/paternal internalizing) were supported in this study, but mediation was not supported for the triangulation model. Considering the mediators together, adolescent perceived threat, negative parenting, maternal internalizing and paternal externalizing behaviors were key in predicting adolescent psychopathology. Overall, the findings from the integrative models suggest that externalizing behaviors (interparental conflict, negative parenting, paternal externalizing behavior) lead to both adolescent internalizing and externalizing behaviors; whereas, parental internalizing behaviors leads to internalizing behaviors only. The implications of these findings, especially from the integrative model, have clinical implications and provide guidance for future research.

Based on panel data collected from 41 countries over the period 2007-2017, this paper analysis how population ageing affects technological innovation through three aspects from the perspective of human capital: the loss of knowledge and talents; reverse force and knowledge spillover. In this paper, the technological innovation index (TII) is calculated by using the factor analysis method. Further with this, a fixed-effects regression model is applied to discover that population exerts a significant positive effect on technological innovation through reverse force, while exerts negative effects on technological innovation through the loss of knowledge and talents and knowledge spillover.

ABSTRACT In the first essay titled "The Value of Strategic Alliances in Acquisitions and IPOs," I investigate how firms' strategic alliance experience affects their valuations as acquisition targets or in IPOs. I propose that strategic alliance experience serves as a valuable signaling device for target and IPO firms, particularly those with more intangible assets and greater opacity. The results show that takeover targets with alliance experience receive higher premiums than those without such experience. More recent alliance experience as well as alliance experience in the same industry also contributes to a larger target gain. Similarly, IPO firms that have alliance experience are shown to obtain higher valuations than those without the experience. Finally, alliance experience increases the likelihood that private firms exit by going public rather than being acquired. In the second essay titled "For Better or For Worse: The Spillover Effect of Innovation Events on Alliance Partners," I examine the spillover effects of breakthrough innovations on the strategic alliance partners of the innovative firm. I find direct stock market evidence that the shareholders of strategic alliance partners significantly benefit from the spillover effects of these innovations. Multivariate analyses indicate that young and newly listed innovator firms with better growth opportunities generate bigger abnormal returns when announcing innovation events and bring larger spillover effects for their alliance partners with similar characteristics. In addition, I explore the risks associated with alliance partnerships, showing that FDA warning letters cause significant wealth losses for both the innovative firm and their alliance partners.

The thesis consists of a summary and four self-contained papers. Paper [I] examines the effects of interregional migration on gross earnings in married and cohabiting couples. In particular, we examine the link between education level and income gains. We find that pre-migration education level is a key determinant of migration and economic outcomes and is also a determinant of the effect of migration on income distribution within the household. The positive average effect on household earnings is largely explained by income gains among highly-educated males. Females generally experience no significant income gain from migration in absolute terms. Paper [II] analyzes the effect of the spouse’s education on individual earnings. In this study, we control for time-invariant heterogeneity that may be correlated with the spouse’s education level and use a rich data set that includes observations of individuals when they are single and when they are married. The results support the hypothesis of cross-productivity for both males and females. Furthermore, couples with education within the same field experience even larger effects. In Paper [III] we aim to study how the spouse’s productivity in the labor market affects one’s own individual earnings when married. Using longitudinal data on individuals as both single and married allows us to estimate the spouses’ productivity as single persons and thereby avoid problems of endogeneity between the two spouses’ labor market performances. Productivity is approximated with residuals from estimates of pre-marriage earnings equations. Results indicate that there are negative effects of the spouse’s productivity on individual earnings for both males and females, and that this effect appears to be enhanced by the duration of the marriage. Paper [IV] studies spousal matching on earnings for females in secondorder marriages. We aim to follow women who marry, divorce, and subsequently remarry compared with females who marry and stay married over the course of the study interval. Overall, we find significant positive correlations for all three of the marital partitions. The correlation tends to be smaller for the first of a sequence of marriages for women who divorce than for women who marry and stay so. For the second of the successive marriages, however, the correlation of the residuals is larger than that for women who marry but once.

Ru/C type ammonia synthesis catalysts are known to be poisoned by hydrogen. In order to elucidate a mechanism for hydrogen poisoning, H2 adsorption and spillover on Ru based ammonia synthesis catalysts were investigated. Supported Ru catalysts and Na promoted Ru catalyst were prepared by incipient wetness impregnation of Ru(NO)(NO3)3 on SiO2, SBA-15, CNT and Vulcan supports. Dispersion value of the catalysts was determined via H2 chemisorption and Transmission Electron Microscopy (TEM) characterization techniques. Over SBA-15 support, the dispersion of the catalyst determined by two different characterization techniques were in agreement. On the other hand, over CNT and SiO2 supports dispersion measured by TEM characterization method was higher than H2 chemisorption method. H2 chemisorption measurements performed over extended periods of time were used to determine the spilled over hydrogen amounts over Ru/Vulcan and Na-Ru/Vulcan catalysts at 375 torr and 10 torr H2 pressure at room temperature. By using H2 uptake data measured for extended periods of 6 &ndash / 24 hours, diffusion coefficient of hydrogen species over Vulcan support was calculated assuming a point source diffusion mechanism. Coefficient of diffusion for Ru/Vulcan and Na-Ru/Vulcan was found as 1.39 x 10-14 cm2/sec and 1.23 x 10-14 cm2/sec, respectively at 375 torr. Similarly, at 10 torr, diffusion coefficients of Ru/Vulcan and Na-Ru/Vulcan catalysts were determined as 1.51 x 10-15 cm2/sec and 1.81 x 10-15 cm2/sec, respectively.

This thesis consists of three papers that examine Marshallian sources of growthand interdependent location of Swedish firms and households. Paper [I] examines the impact of static and dynamic knowledge externalitiesand their impact on Swedish market operating firms growth pattern between1997 and 2005. The three types of externalities are: (i) Marshall-Arrow-Romer(MAR), (ii) Jacobs, and (iii) Porter. My empirical findings for the 40 industriescan briefly be summarized in the following points: (i) static MAR, Jacobsand/or Porter externalities are present in all but nine industries; (ii) except for five cases all industries are exposed to one or more of the MAR, Jacobs and/orPorter type of dynamic externalities; (iii) contrary to previous studies but inline with theoretical predictions, we do find positive and significant effects forstatic as well as dynamic Jacobs externalities. Paper [II] focuses on the presence of agglomeration economies in the form of labor pooling and educational matching and their impact on economic growth in Swedish manufacturing and service industries from 1997 to 2005. To accomplish this I employ a translog production function that enables me to decompose the total agglomeration elasticities into returns that accrue to: direct agglomeration effects, an indirect effect of agglomeration at given input levels, a cross agglomeration effect of matching on labor pooling and vice versa. Household services is the single industry where both the labor pooling and matching hypothesis is supported by our data. Publishing is the sole instance of betterinput usage due to matching consistent with the theoretical claim. Paper [III] studies the interdependent location choices of households and firms expressed as population and employment in Swedish municipalities. Using a model of the Carlino-Mills type to investigate the impact of various location attributes such as differences in public revenue and spending patterns, accessibility to jobs and potential workforce, quality of the labor pool, concentration ofcommercial, private and public services. The findings suggest that fiscal factors significantly alters the impact of housing and accessibility attributes compared to exiting studies on Swedish data. Another finding, in line with previous studies, indicate that there is a significant degree of inertia in household and firm location choices.

This paper examines the impact of USD and EUR exchange rates on the Swedish stock market performance for different economic sectors over a time period of ten years (2003-2013). The growing integration between foreign exchange markets and stock markets with the wide spread use of hedging and diversification policies made it necessary to test the degree of impact these two distinct markets share between each other. Number of studies, were done studying the relationship between the exchange rates and stock performance combining and comparing different economies and currencies. Nevertheless, research gap prevailed when it came at the point of the studying the relationship on Swedish stock and foreign exchange market. The research was conducted with the quantitative method. Initially we have tested how the performance of Swedish stock market is correlated with the return of the USD and EUR in different economic sectors over different time periods. Later, we try to investigate if there is any spillover effect flows from the exchange market to the Swedish stock market. The Pearson’s correlation coefficient and GARCH (1,1) model were applied to study the correlation and spillover effect between the exchange and stock return respectively. Our empirical study showed that there is very low correlation which is statistically insignificant between the two different markets. Correlations were found to be significantly varied across the different economic sectors in different time periods. Moreover empirical study supported that the spillover effect exists and showed that movement of exchange rates will affect the future performance of stock market. The significant conclusions were that USD and EUR can be used as portfolio diversification and during the volatile exchange market, investors should diversify or hedge their risk domestically and vice versa. The implications of this finding is particularly very important for the portfolio managers when devising their hedging policies and diversifying their portfolios in order to minimize their unsystematic risk.

The purpose of this study was to investigate the relationship between gold and stock returns with evidence from BRIC countries during 2001-2010. The importance of this topic is caused by instability in the world economy and stock markets, and due to this instability, there is a growing interest in gold from investors and the current bull market of gold. Considering that gold is independent from most of the macroeconomic factors we believe that it therefore should be independent from or low correlated with stock, which makes this metal useful for portfolio diversification. Based on previous studies, we also believe that gold can be used to predict, to some degree, the stock market trend. The force behind such stable price growth of gold is sustained by demand from emerging countries such as BRICs. Moreover, there is lack of research on this topic from the perspective of different economic sectors. These facts determined the choice of countries along with their economic sectors. The research was designed in the frame of quantitative method. The types of relationship that were investigated are correlation and spillover effects. In order to examine these relationships we have utilized secondary data, which are gold prices and stock indices turned into returns. The Pearson’s correlation and diagonal BEKK GARCH were applied to test the correlation and spillover effects between returns of gold and stock, respectively. The results of the study showed that gold and stock returns are correlated, however to a low degree. Additionally, correlation varies across countries and their economic sectors over time, which may influence investors’ decision in choice of allocation of investments. The other findings showed the existence of mean spillover effects, both unidirectional and bidirectional, and volatility spillover effects between gold and stock returns. The principal conclusions were that gold is an efficient portfolio diversifier, which also plays a role of a hedge and a safe haven. Similarly, taking into account an existence of spillover effects, gold can be helpful in terms of stock prediction and vice versa. Further, another important finding was that not all of the economic sectors had mean spillover with gold, but in terms of volatility, every sector had a certain relationship with gold.

The role of universities in supporting economic development has been explored in numerous studies emphasizing the mechanisms of technology transfer and knowl-edge spillover. However, in addition to these forms of intellectual capital, university scientists bring other resources into research collaboration and contribute to firm part-nerships in both direct and indirect ways. This thesis proposes the concept of resource spillover, which captures the various ways in which university scientists can benefit col-laborating firms. The study first analyzes firms, university scientists, and collaboration along with the concepts of ego, alter, and network ties in social capital theory; then it categorizes the resources possessed by university scientists into human capital, social capital, and positional capital, and tests the impact of each on the performance of a firm. The study finds that firms benefit from research collaboration in terms of both increased research capability and research output and improved public relations and research credibility. The study is carried out using a sample of new nanotechnology-based firms in the United States. As the U.S. government recognizes nanotechnology as providing scientific and technological opportunities with immense potential, this industry has be-come the recipient of significant federal R&D funding. In turn, because academic re-search has proven to be important to not only overall nanotechnology R&D but also in-dustrial R&D, it necessitates appropriate policy programs that support successful re-source spillover from academia and promote the development of industry.