O seguinte trabalho consiste em uma avaliação do valor das ações da Samsung Electronics Co., Ltd. para o ano 2020, os pressupostos adotados para a previsão dos próximos cinco anos (2020F-2024F) foram baseados no desempenho histórico dos últimos quatro anos (2016-2019). Este trab…
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Accurately predicting the abundance and structural evolution of dark matter subhaloes is crucial for understanding galaxy formation, large-scale structure, and constraining the nature of dark matter. Due to the nonlinear nature of subhalo evolution, cosmological N-body simulatio…
The study of the cosmological large-scale structure seeks to understand the makings and the evolution of the universe. In this subject, I worked on improving current techniques and their application to the existing large, high-precision cosmological data sets. Specifically, my d…
O ano 2020 ficará para sempre registado na história mundial como o ano da propagação da pandemia COVID-19 por todo o mundo. O impacto desta em Portugal foi severa, com claras repercussões no tecido empresarial português e, por sua vez, nas atitudes empreendedoras. Com o presente…
Interactions between photons and plasmons have resulted in a hotbed of research activity in the physical sciences, notably through techniques such as white-light and Raman scattering, as evidenced by > 10,000 articles published in 2020. In this work, plasmon-mediated linear w…
Given the historical underrepresentation of women and underrepresented minority students, we investigate existing demographic disparities and describe interactions of student-level demographics with standardized test scores using data from over 20,000 introductory physics studen…
In an effort to provide more weight to the particle nature of light, a lesson sequence was developed that reflected the Next Generation Science Standard (NGSS) Performance Expectation (PE) HS-PS4-3, which has students evaluating the claim, evidence, and reasoning behind the idea…
An inquiry into atmospheric escape driven by photoionization. We begin with a brief survey of the relevant historical development of atmospheric escape, spanning from the origins of kinetic theory to the age of exoplanets. Collisional mechanisms justifying the continuum assumpti…
Calls to transform introductory college physics courses to include scientific practices require assessments that can measure the extent to which these transformations are effective. Such assessments should be able to measure students' abilities to intertwine important concepts w…
Free-Electron Lasers like the one at the SLAC National Accelerator Laboratory are sources of extremely bright X-rays that are useful in a variety of scientific imaging applications. Because there are only a handful of FEL facilities around the world, access to these X-rays is in…
This study investigates the orographic effects of the New Guinea Mountains on the eastward propagation of the Madden-Julian Oscillation (MJO) and the rainfall associated with it during the strong 2007-08 event (MJO07-08). The eastward propagation of the MJO has been observed in …
Large Hadron Collider (LHC) is a top quark factory, which is the heaviest elementary particle discovered so far. Due to its small life-time top quark decays before hadronization, and hence most of its properties are not washed out. Top quark events are often a large background i…
Wire array z-pinches provide an accessible means to research plasmas of high density and temperature and have valuable applications in the fields of inertial confinement fusion (ICF), astrophysics, and radiation studies. The purpose of this work is tungsten/aluminum z-pinch stud…
The SuperTIGER (Trans-Iron Galactic Element Recorder) experiment was launched on a long-duration balloon flight from Williams Field, Antarctica, on December 8, 2012. The instrument measured the relative elemental abundances of galactic cosmic rays (GCR) in the charge ( Z ) range…
As a reflection of my career to be an effective college physics teacher, my thesis is in two parts. The first is in education research, the focus of this part is to have a tool to evaluate pedagogies I have learned at the school and plan to apply in my classrooms back home. Cons…
In this work we analyze the AC impedance of a planar probe in the ion dominated dynamics regime, where &ohgr; « &ohgr;pe, and in the presence of a sheath. We use the warm plasma fluid approximation and neglect electron inertia. A fluid simulation together with the Poisson equati…
In this PhD. research, a new power amplifier architecture is introduced. This work develops the push-pull architecture into a multifunctional matching network and combiner to create a high power, high efficiency, linear power amplifier (PA) that operates over a wide bandwidth. T…
In this dissertation, we investigated a vapor-liquid-solid (VLS) synthesis of high-density lead sulfide (PbS) NW arrays and nano pine trees directly on Ti thin films, and a fabrication of photovoltaic devices based upon the PbS NWs. The as-grown NW arrays are largely vertically …