The outbreak of COVID-19 forced the world population to find new ways to improve their productivity. It also significantly changed the course of education and instruction entirely. Like many students worldwide, adult English as a Second Language (ESL) students have been dramatically impacted by the sudden switch to online courses due to the COVID-19 outbreak. Blended Online Learning (BOL) was considered an innovative transition for adult ESL students due to the fact that it allows the learner to view the classroom as a social learning environment, thereby strengthening their connection to the language. This dissertation aimed to investigate the online learning experiences of a group of ESL students and their instructor through online zoom classes during COVID-19. The study employed a qualitative case study research methodology. This case study utilized purposeful sampling to focus on the experiences of adult ESL students and their course instructor with learning and teaching online during the pandemic. The target population for this study was a group of 8 international adult students and their respective course instructor. Data were collected from ten field observations, nine semi-structured interviews through Zoom, field notes, and document analysis. Findings revealed that participants showed positive experiences with online learning as it had provided students with new communication forms. Breakout rooms, group discussions, and discussion boards were methods the majority of students agreed were helpful for participation while facilitating social interaction. Students preferred to communicate with each other through online platforms as they feel safer and less shy to express their opinions. Conversely, participants showed negative experiences with the lack of reliable internet connectivity, especially in rural areas, which affected the students' ability to access online courses. Based upon the dissertation's findings, there are several practical implications for students, instructors, institutions, and administrators. Recommendations for additional research are needed to provide various observations and solutions to promote online platforms, including offering instructors training to guide students through these platforms expertly and merging synchronous and asynchronous learning to ensure a holistic learning environment for adult ESL learners.

Since culturally diverse people need to collaborate in the 21st century, Higher Education adopted global citizenship education (GCE) to promote a cosmopolitan mindset. Learners in the digital era can use various modes of communication, exerting individual agency so that learners can construct global minds through their communication experiences. Blended learning based on learner-centered knowledge construction may provide extended spaces where learners can shape a personally trusted and collectively consensual vision of the global mind. A qualitative evaluation case study explored learners' perception shifts regarding autonomous identity formations and confidence-trust-building in a blended course under GCE. Due to the Covid-19 pandemic, semi-structured in-depth online interviews and document analyses on the archive data were adopted to triangulate learners' perceptions and instructors' observations. Findings showed that individuals could shape their global citizen identities through a performative loop of reflection and interaction provided via a blended format. The participants' comfort zone levels influenced different identity formation paths. However, their goals, in the end, were aligned under the idea of engaging in local community activities through lifelong commitment. Intrapersonal and interactional forms of communication solidified self-confidence and collective trust through synergically linked blended learning activities. Overall, global citizen identities have gradually evolved while self-confidence and trust in others have gradually increased through different communication steps. The significance of the study lies in reinforcing the results of prior research about performativity-oriented GCE through a community of people practicing in blended learning environments. Members' hands-on activities while building self-confidence and collective trust through communication helped them shape their collective identity. In these processes, individuals' intrapersonal communication seemed to play an insightful role in effectively connecting reflective and interactive activities. Enhanced credibility by replicating this GCE model in future studies will ensure various organizations and institutions adopt it to shape their members' global visions and build group cohesion.

The purpose of this study was to examine the impact of problem-based learning, blended problem-based learning, and traditional lecture teaching methods on students’ academic achievement and self-regulation. Specifically, student’s motivation orientation, use of learning strategies, and critical thinking dispositions were assessed. The research design for this study was a quasi-experimental pretest/posttest design. There were 90 undergraduate education majors who participated in the study. There were 29 students who participated in the problem-based learning group, 30 students participated in the blended problem based learning group, 31 students participated in the traditional group. Convenience sampling was used for this study. The findings in this study indicated that the students who were taught via the blended problem based learning teaching methodology scored significantly higher on the comprehensive exam for academic achievement and subcategories of the Motivated Strategies for Learning Questionnaire than the problem based learning and the traditional lecture group. There were no significant differences between groups for critical thinking dispositions on the California Critical Thinking Dispositions Inventory. Overall, the blended problem based learning teaching methodology did have a significantly positive impact on students’ academic achievement and self-regulation skills.

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This descriptive, survey research study was conducted using a quantitative, non-experimental, correlational, research design. Given the ever-increasing numbers of students taking online learning courses both before and during the COVID-19 pandemic, this study sought to explore this phenomenon by measuring the levels of online graduate student preceived connectedness at Virginia Tech. Bolliger and Inan (2012), validated their Online Student Connectedness Survey (OSCS) instrument in a research study that focused only on connectedness, and was limited to just one subject area, computer engineering. Permission was granted for the use of their OSCS instrument for this study, and the focus was expanded to include various subject areas, and to explore the associations between graduate student peceived connectedness and graduate student perceived learning and retention. Specifically, this study sought to find out whether there were indicators that an association existed between graduate student perceived connectedness and graduate student perceived learning and retention across the different modes of online learning (e.g., asynchronous, synchronous, and blended asynchronous/synchronous). The total sample for this research study was comprised of 67 research participants (32 males and 35 females), and their modes of online learning were asynchronous (n = 22), synchronous (n = 30), and blended asynchronous/synchronous (n = 15). Results indicated no statistically significant differences in graduate student perceived connectedness across the three online learning modes. There was a statistically significant association between graduate students' level of perceived connectedness and graduate student perceived learning and retention. As the level of graduate student perceived connectedness rose, so did graduate student perceived learning and retention. Furthermore, the results revealed that there were no statistically significant differences in the levels of graduate student perceived connectedness across the two types of online courses (e.g., pandemic online learning courses and regular online learning courses). This indicated that at Virginia Tech online graduate students felt connected whether they were in a pandemic online learning course or a regular online learning course. / Doctor of Philosophy / This survey research study was conducted using a quantitative, non-experimental, research design. Given the ever-increasing numbers of students taking online learning courses both before and during the COVID-19 pandemic, this study sought to explore this phenomenon by measuring the levels of online graduate student preceived connectedness at Virginia Tech. Bolliger and Inan (2012), verified their Online Student Connectedness Survey (OSCS) instrument in a research study that focused only on connectedness, and was limited to just one subject area, computer engineering. Permission was granted for the use of their OSCS instrument for this study, and the focus was expanded to include various subject areas, and to explore the associations between graduate student peceived connectedness and graduate student perceived learning and retention. Specifically, this study sought to find out whether there was an association between graduate student perceived connectedness and graduate student perceived learning and retention across the asynchronous, synchronous, and blended asynchronous/synchronous learning platforms. The total sample for this research study was 67 research participants (32 males and 35 females), and there were 22 asynchronous participants, 30 synchronous participants, and 15 blended asynchronous/synchronous participants. Results indicated no significant differences in graduate student perceived connectedness across the three online learning modes. There was a significant association between graduate students' level of perceived connectedness and graduate student perceived learning and retention. As the level of graduate student perceived connectedness rose, so did graduate student perceived learning and retention. Furthermore, the results revealed that there were no significant differences in the levels of graduate student perceived connectedness across the two types of online courses (pandemic online learning courses and regular online learning courses). This indicated that at Virginia Tech online graduate students felt connected whether they were in a pandemic online learning course or a regular online learning course.

With the growing prevalence of blended learning in classrooms across the country, the need for teacher training for effective blended learning implementation is critical. This research study focuses on the skills and training required to implement blended learning effectively. Observations of classroom instruction and professional development, surveys, and interviews with teachers and administrators added to an extensive literature review to inform training recommendations for school sites and teacher education programs. The results show that professional development is effective when it includes peer observations and collaboration, modeling of best practices, and the integration of blended learning programs with instructional practice. Individualized differentiation, constructivist learning opportunities, and strategic grouping are also key elements of effective blended learning implementation. With carefully planned professional development, teachers can use blended learning in the classroom to engage students and offer rigorous learning experiences that prepare students to be critical thinkers in school and beyond.

Conventional airliners use two to four engines in a Cayley-type arrangement to provide thrust, and the thrust from these engines is typically concentrated right behind the engine. Distributed propulsion is the idea of redistributing the thrust across most, or all, of the wingspan of an aircraft. This can be accomplished by using several large engines and using a duct to spread out the exhaust flow to form a jet-wing or by using many small engines spaced along the span of the wing. Jet-wing distributed propulsion was originally suggested by Kuchemann as a way to improve propulsive efficiency. In addition, one can envision a jet-wing with deflected jets replacing flaps and slats and the associated noise. The purpose of this study was to assess the performance benefits of jet-wing distributed propulsion. The Reynolds-averaged, finite-volume, Navier-Stokes code GASP was used to perform parametric computational fluid dynamics (CFD) analyses on two-dimensional jet-wing models. The jet-wing was modeled by applying velocity and density boundary conditions on the trailing edges of blunt trailing edge airfoils such that the vehicle was self-propelled. As this work was part of a Blended-Wing-Body (BWB) distributed propulsion multidisciplinary optimization (MDO) study, two airfoils of different thickness were modeled at BWB cruise conditions. One airfoil, representative of an outboard BWB wing section, was 11% thick. The other airfoil, representative of an inboard BWB wing section, was 18% thick. Furthermore, in an attempt to increase the propulsive efficiency, the trailing edge thickness of the 11% thick airfoil was doubled in size. The studies show that jet-wing distributed propulsion can be used to obtain propulsive efficiencies on the order of turbofan engine aircraft. If the trailing edge thickness is expanded, then jet-wing distributed propulsion can give improved propulsive efficiency. However, expanding the trailing edge must be done with care, as there is a drag penalty. Jet-wing studies were also performed at lower Reynolds numbers, typical of UAV-sized aircraft, and they showed reduced propulsive efficiency performance. At the lower Reynolds number, it was found that the lift, drag, and pitching moment coefficients varied nearly linearly for small jet-flap deflection angles. / Master of Science

This study investigated the effect of a blended-learning approach in the learning of problem-solving skills in a first-level distance education physics module. A problem-solving type of instruction with explicit teaching of a problem-solving strategy was implemented in the module, which was presented through correspondence, online using an in-house learning management system as well as two face-to- face discussion classes. The study used the ex post facto research design with stratified sampling to investigate the possible cause-effect relationship between the blended-learning approach and the problem-solving performance. The number of problems attempted, the mean frequency of using strategy in problem solving and the achievement marks of the three strata were compared using inferential statistics. The finding of the study indicated that the blended-learning approach had no statistically significant effect in the learning of problem-solving skills in a distance education module. / Educational Studies / M. Ed. (Open and Distance Learning)