Studies on the Preparation and Luminescence Properties of Cadmium Selenide Quantum Dots, Their Immobilization, and Applications.

Quantum dots are semiconductive particles whose properties are highly influenced by the presence of at least one electron. Cadmium selenide quantum dots were synthesized via colloidal synthesis. Contrary to previous preparations, more focus was placed on the temperature rather than the duration of time at which they form. A series of colored solutions were obtained because the excited quantum dots of various sizes emitted specific wavelengths of light. The emission spectra showed that the temperature-dependent quantum dots were successfully synthesized. The quantum dots were also immobilized on various surfaces, and the luminescence properties were examined. The quantum dots that were immobilized in sol-gels through chemiluminescence (CL) analyses were found to be stable and were able to maintain their luminescence properties with extensive uses and long-term storage. Linear calibration curves were obtained for concentrations of hydrogen peroxide from 1.75 x 10-4 M to 1.75 x 10-2 M in TCPO-CL

The Evolution of Male-Biased Dispersal under the Joint Selective Forces of Inbreeding Load and Demographic and Environmental Stochasticity

Acknowledgments We thank G. Bocedi, S. Palmer, and three anonymous reviewers for helpful comments on earlier drafts. R.C.H. was funded by the Natural Environment Research Council (1271380). Simulations were performed on the University of Aberdeen’s Maxwell high performance computing cluster.Peer reviewedPublisher PD

More rapid climate change promotes evolutionary rescue through selection for increased dispersal distance

Acknowledgements This research was funded by FWO projects G.0057.09 to DB and JB, and G.0610.11 to DB, JB and RS. JMJT, DB and RS are supported by the FWO Research Network EVENET.Peer reviewedPublisher PD

The Social Cognitive Model of Leadership Perceptions: Proposing a Dynamic, Integrated Theory of Leadership Identification and Appraisal

This paper is an exploration of the relationships between the stereotype content model, implicit leadership theory, and leadership behavior theory with a focus on illuminating the elements held in common by these three theories and identifying the positive implications of integrating these theories into an inclusive social cognitive model for future leadership research. After briefly summarizing the three focal theories, we highlight the correspondence between them. We then establish the importance of organizing these theories into a comprehensive model which can be used to understand and explain leadership from a cohesive, multidimensional approach. In proposing such a theoretical model, we take into account the reciprocal relationships between stereotypes of groups and individuals, leadership prototypes held within the mind of those perceiving the leader, and leadership behaviors acted out within organizations. We also discuss the implications of integrating these theories into a dynamic social cognitive model of leadership perceptions. These implications include accurately understanding the gravity of warmth and competency judgments in leadership appraisal and appropriately recognizing the consequences that halo effect and negative correlations between dimensions have on leadership recognition and evaluation in both theory and practice. We propose future research to empirically establish the theoretical foundation of the social cognitive model of leadership perceptions. We also suggest that this model might be used to inform the assessment, selection, training, and development of those who lead in a variety of contexts

Informed dispersal based on prospecting impacts the rate and shape of range expansions

Acknowledgements This model was initially designed during the Purple Patch Pumpkin meeting in the Corbières (France) in October 2018 and we thank all participants for fruitful discussions. Funding AP was funded by a European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement no. 753420 (EcoEvoProspectS project).Peer reviewedPublisher PD

Carbon-carbon bond forming reactions of biomass derived aldehydes

The Knoevenagel reaction was applied to form a carbon-carbon double bond between the aldehydes (HMF, furfual) and an alpha di-carbonyl compound. The alpha di-carbonyl compound used was malonic acid, which can be bio-derived from glucose along fermentation routes. The effects of solvents (THF, water, ethanol, isopropanol, ethyl ether, toluene) and catalysts (e.g. homogeneous and heterogeneous amines, solid basic oxides) on the yields of alpha-beta unsaturated acids were investigated. It was found that the homogeneous amines worked well in THF solvent (90-100% conversion, 99% selectivity for furfural and HMF), while the poly(styrene) supported ethylenediamine gave a higher conversion and selectivity for HMF (65± 5%, 99% selectivity) over furfural (58 ± 7%, 99% selectivity). This trend was also present in competition reactions where both HMF and furfural were reacted in the same vessel. á-â Unsaturated mono-acids for both HMF and furfural were identified as minor side products. However, levulinic acid did not work as well under the conditions studied. Lastly, among the solvents studied, several caused precipitation of the Knoevenagel products.M.S.Committee Chair: Dr. Christopher Jones; Committee Co-Chair: Dr. Pradeep Agrawal; Committee Member: Dr. Sujit Banerjee; Committee Member: Dr. Tom Fulle

Inter-annual variability influences the eco-evolutionary dynamics of range-shifting

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When do young birds disperse? : Tests from studies of golden eagles in Scotland

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The Challenge-Hindrance Model of Stress and its Intersections With the Conservation of Resources Theory

This paper briefly summarizes the challenge-hindrance model of stress (CHM) through its basis in the transactional theory of stress, and it integrates modern theories of stress found in social psychology and management literature. In doing so, we provide a content map/process model to guide future research that can contribute to the creation of a more effective measure of the secondary appraisals of stressors. Although psychometric and related statistical concerns regarding extant measures have been noted and discussed in the literature, our hope is that the proposed model may aid in the conceptualization of the nomological network of the stress process that can further aid measurement endeavors.This paper also expands upon the relationship between the Hobfoll (1989) Conservation of Resources Theory (CORT) and the CHM model, an understanding that may aid in the development of a more effective measure of secondary appraisals of stress. Further, we propose an individual difference to be tested in future research which incorporates threat stressors and their appraisal—an unstudied link in the CHM research suggested by Horan (2020). We incorporate experiential avoidance into the proposed theoretical process model, a previously undiscussed moderator in organizational literature despite heavy empirical evidence in clinical psychological research as this individual difference. These propositions are then used to suggest avenues for future research