Teachers as grantseekers : urban women teachers\u27 perceptions of competitive grant programs for individual teachers.

EducationDoctor of Education (Ed.D.

STRATEGIES FOR CONTROL OF END-USER COMPUTING: IMPACTS ON END USERS

The prevalence of end-user computing has resulted in a need for more effective methods of controlling such computing activities. The present experiment examined the impact of two potential control strategies, behavior-based and outcome-based control, on end-user affective reactions. Results indicated that subjects in the behavior-based control condition reported greater levels of stress, less self-determination, and less process satisfaction than the outcome control group. Further analysis suggested that the detrimental effect of behavior-based control on process satisfaction could be explained through the mediating effect of stress. Implications of the results for the design of effective end-user control strategies are discussed

Opened and Closed Doors: An Inside Look at How the Internet Changed Middle East Policy

From the mainstream media to citizen journalism, and from politicians to activist groups, the rise of social media and the new Internet age has changed the dynamics of global diplomacy, international decision-making and large-scale movements. The Internet age has altered how individuals interpret foreign relations, mobilize movements and influence policy decisions. In the Middle East especially, social media users have demonstrated the power to propel uprisings on authoritarian regimes, stimulate diplomacy and impact relationships between nations. In three chapters, this thesis explores how the U.S.-Israel relationship, the Arab Spring and the Iran nuclear deal were all impacted by the rise of the digital age. Specifically, this thesis explores how communications technology has changed over time, how foreign policy is shaped, how international movements rise, how countries’ reputations are formed and how the Internet can ultimately impact the outcome of major world decisions. After examining several case studies, this thesis concludes that the Internet Age has changed how the world receives information. Moreover, the proliferation of social media has provided individuals with more access to news with just a click of a button. Politicians, journalists and activists now have the ability to communicate directly to the public through their 21st Century technology. In conclusion, this thesis is a snapshot of time regarding how the Internet permanently transformed how the way the international community obtains information

Distress Levels among Parents of Active Duty Soldiers during Wartime

Objective: Military service is a highly stressful period both for the soldiers serving and for their parents. Surprisingly, parents’ experience has been mostly ignored in the research. This study’s goal is to shed light on the experience and distress levels of parents of active duty combat soldiers during Operation Protective Edge, a military operation carried out by the Israel Defense Forces during July and August of 2014.Methods: During the advanced stages of the operation, 69 parents of Israeli male combat soldiers (55 mothers and 14 fathers) completed an online survey measuring symptoms of Posttraumatic Stress Disorder (PTSD-Checklist-5) and distress (Brief Symptom Inventory-18). Participants were recruited using a convenience sample, by posting ads on the public Facebook pages of the researchers and of the groups dedicated to parents of Israeli soldiers.Results: Parents’ depression and anxiety symptom levels were higher than depression and anxiety symptom levels of the adult community norms in Israel. General distress rates of parents were similar to those presented by adults in southern Israel who were exposed for 7 years to the ongoing threat of daily rocket fire from Gaza, and higher than rates of a non-threatened Israeli population. Finally, 20.2% of the parents presented PTSD-like symptoms, a higher percentage than the probable PTSD diagnosis rates that were found in the general population in Israel during previous terror waves.Conclusion: This study provides preliminary evidence of soldiers’ parents’ distress and indicates the need for a better understanding of the impact of military service on soldiers’ parents

On the Emergent Spectra of Hot Protoplanet Collision Afterglows

We explore the appearance of terrestrial planets in formation by studying the emergent spectra of hot molten protoplanets during their collisional formation. While such collisions are rare, the surfaces of these bodies may remain hot at temperatures of 1000-3000 K for up to millions of years during the epoch of their formation. These object are luminous enough in the thermal infrared to be observable with current and next generation optical/IR telescopes, provided that the atmosphere of the forming planet permits astronomers to observe brightness temperatures approaching that of the molten surface. Detectability of a collisional afterglow depends on properties of the planet's atmosphere -- primarily on the mass of the atmosphere. A planet with a thin atmosphere is more readily detected, because there is little atmosphere to obscure the hot surface. Paradoxically, a more massive atmosphere prevents one from easily seeing the hot surface, but also keeps the planet hot for a longer time. In terms of planetary mass, more massive planets are also easier to detect than smaller ones because of their larger emitting surface areas. We present preliminary calculations assuming a range of protoplanet masses (1-10 M_\earth), surface pressures (1-1000 bar), and atmospheric compositions, for molten planets with surface temperatures ranging from 1000 to 1800 K, in order to explore the diversity of emergent spectra that are detectable. While current 8- to 10-m class ground-based telescopes may detect hot protoplanets at wide orbital separations beyond 30 AU (if they exist), we will likely have to wait for next-generation extremely large telescopes or improved diffraction suppression techniques to find terrestrial planets in formation within several AU of their host stars.Comment: 28 pages, 6 figures, ApJ manuscript format, accepted into the Ap

Formation and Structure of Low Density Exo-Neptunes

Kepler has found hundreds of Neptune-size (2-6 R_Earth) planet candidates within 0.5 AU of their stars. The nature of the vast majority of these planets is not known because their masses have not been measured. Using theoretical models of planet formation, evolution and structure, we explore the range of minimum plausible masses for low-density exo-Neptunes. We focus on highly irradiated planets with T_eq>=500K. We consider two separate formation pathways for low-mass planets with voluminous atmospheres of light gases: core nucleated accretion and outgassing of hydrogen from dissociated ices. We show that Neptune-size planets at T_eq=500K with masses as small as a few times that of Earth can plausibly be formed core nucleated accretion coupled with subsequent inward migration. We also derive a limiting low-density mass-radius relation for rocky planets with outgassed hydrogen envelopes but no surface water. Rocky planets with outgassed hydrogen envelopes typically have computed radii well below 3 R_Earth. For both planets with H/He envelopes from core nucleated accretion and planets with outgassed hydrogen envelopes, we employ planet interior models to map the range of planet mass--envelope mass--equilibrium temperature parameter space that is consistent with Neptune-size planet radii. Atmospheric mass loss mediates which corners of this parameter space are populated by actual planets and ultimately governs the minimum plausible mass at a specified transit radius. We find that Kepler's 2-6 R_Earth planet candidates at T_eq=500--1000K could potentially have masses less than ~4 M_Earth. Although our quantitative results depend on several assumptions, our qualitative finding that warm Neptune-size planets can have masses substantially smaller than those given by interpolating the masses and radii of planets within our Solar System is robust.Comment: 17 pages, 9 figures, accepted for publication in Ap

Autistic College Students and COVID-19: Anxiety, Support Needs and Responses by Specialized Programs

Providing resources and support to college students during the COVID-19 global pandemic has produced unique challenges for all students, particularly those with autism. In March 2020, halfway through the spring term, the COVID-19 global pandemic forced most institutions of higher education across the country to move all instruction and support to an online, remote format, including those for students with autism. Colleges and autism support programs are now grappling with how to effectively support students amid a global pandemic. Yet there is little information available about how students’ needs have changed with this new environment. In this exploratory study, 76 college students with autism from across the country answered a series of questions (both Likert scale and open-ended) about their anxieties related to COVID-19 and attending college. The data were analyzed using descriptive statistics and thematic analysis. Results revealed that students are most anxious about getting sick or spreading COVID-19 to others and least anxious about wearing masks and needing to socially distance. This paper also profiles the adjustments made to several college autism support programs (led by the authors) in order to accommodate the changes to college campuses and the impact on student needs. The survey results and recent experiences across programs will inform recommendations for colleges as they build toward more inclusive, supportive campus environments and respond to crises like the pandemic

The Atmospheric Signatures of Super-Earths: How to Distinguish Between Hydrogen-Rich and Hydrogen-Poor Atmospheres

Extrasolar super-Earths (1-10 M_{\earth}) are likely to exist with a wide range of atmospheres. Some super-Earths may be able to retain massive hydrogen-rich atmospheres. Others might never accumulate hydrogen or experience significant escape of lightweight elements, resulting in atmospheres more like those of the terrestrial planets in our Solar System. We examine how an observer could differentiate between hydrogen-rich and hydrogen-poor atmospheres by modeling super-Earth emission and transmission spectra, and we find that discrimination is possible by observing the transmission spectrum alone. An Earth-like atmosphere, composed of mostly heavy elements and molecules, will have a very weak transmission signal due to its small atmospheric scale height (since the scale height is inversely proportional to molecular weight). On the other hand, a large hydrogen-rich atmosphere reveals a relatively large transmission signal. The super Earth emission spectrum can additionally contrain the atmospheric composition and temperature structure. Super-Earths with massive hydrogen atmospheres will reveal strong spectral features due to water, whereas those that have lost most of their hydrogen (and have no liquid ocean) will be marked by CO$_2$ features and a lack of H$_2$O. We apply our study specifically to the low-mass planet orbiting an M star, Gl 581c ($M sin i$ = 5 M_{\earth}), although our conclusions are relevant for super-Earths in general. The ability to distinguish hydrogen-rich atmospheres might be essential for interpreting mass and radius observations of planets in the transition between rocky super-Earths and Neptune-like planets.Comment: 28 pages, 6 figures, accepted to Ap

Studying the atmosphere of the exoplanet HAT-P-7b via secondary eclipse measurements with EPOXI, Spitzer and Kepler

The highly irradiated transiting exoplanet, HAT-P-7b, currently provides one of the best opportunities for studying planetary emission in the optical and infrared wavelengths. We observe six near-consecutive secondary eclipses of HAT-P-7b at optical wavelengths with the EPOXI spacecraft. We place an upper limit on the relative eclipse depth of 0.055% (95% confidence). We also analyze Spitzer observations of the same target in the infrared, obtaining secondary eclipse depths of 0.098+/-0.017%, 0.159+/-0.022%, 0.245+/-0.031% and 0.225+/-0.052% in the 3.6, 4.5, 5.8 and 8.0 micron IRAC bands respectively. We combine these measurements with the recently published Kepler secondary eclipse measurement, and generate atmospheric models for the day-side of the planet that are consistent with both the optical and infrared measurements. The data are best fit by models with a temperature inversion, as expected from the high incident flux. The models predict a low optical albedo of ~< 0.13, with subsolar abundances of Na, K, TiO and VO. We also find that the best fitting models predict that 10% of the absorbed stellar flux is redistributed to the night side of the planet, which is qualitatively consistent with the inefficient day-night redistribution apparent in the Kepler phase curve. Models without thermal inversions fit the data only at the 1.25 sigma level, and also require an overabundance of methane, which is not expected in the very hot atmosphere of HAT-P-7b. We also analyze the eight transits of HAT-P-7b present in the EPOXI dataset and improve the constraints on the system parameters, finding a period of P = 2.2047308+/-0.0000025 days, a stellar radius of R* = 1.824+/-0.089Rsun, a planetary radius of Rp = 1.342+/-0.068RJup and an inclination of i = 85.7+3.5-2.2 deg.Comment: 21 pages, 8 figures, accepted by the Astrophysical Journa