A new stall-onset criterion for low speed dynamic-stall

The Beddoes/Leishman dynamic-stall model has become one of the most popular for the provision of unsteady aerofoil data embedded in much larger codes. The underlying modeling philosophy was that it should be based on the best understanding, or description, of the associated physical phenomena. Even though the model was guided by the flow physics, it requires significant empirical inputs in the form of measured coefficients and constants. Beddoes provided these for a Mach number range of 0.3–0.8. This paper considers one such input for a Mach number of 0.12, where, from the Glasgow data, it is shown that the current stall-onset criterion, and subsequent adjustments, yield problematic results. A new stall criterion is proposed and developed in the best traditions of the model. It is shown to be very capable of reconstructing the Glasgow's data for stall onset both the ramp-up and oscillatory tests

Logistical Implications of Operational Maneuver from the Sea

The U.S. Marine Corps concept for the projection of naval power ashore is known as Operational Maneuver from the Sea, or OMFTS. Like the Navy-Marine Corps white paper Forward... from the Sea, it emphasizes the world\u27s littoral regions as areas of potential conflict, and in turn the role of naval expeditionary forces in such conflicts

Phantastes Chapter 5: Pygmalion

Thomas Lovell Beddoes (1803-1849) was a Romantic poet intensely focused on death. His poem “Pygmalion” (1825) recounts the myth of the Cypriot sculptor who fell in love with the statue he carved. In this chapter, MacDonald echoes this myth

Characterizing mental health and wellness in students across engineering disciplines

Anecdotal evidence has long supported the idea that engineering students have lower levels of mental health and wellness than their peers. It is often posited that the large number of courses, low overall retention, difficult courses, and the abundance of intensive engineering projects lead to an unhealthy work-life balance and eventually lower levels of mental health for this population. To date, however, there has been no comprehensive study on the prevalence and types of mental health conditions that afflict engineering students, or any data on whether certain disciplines within engineering may see a greater prevalence of certain mental health conditions among students than other disciplines. This paper presents the results of a one-year study performed at California Polytechnic State University to address the knowledge gap surrounding mental health across students in different engineering disciplines in higher education. For this study, the authors developed and administered a comprehensive mental health questionnaire to both undergraduate and graduate students across eleven different engineering disciplines. The instrument screens for likelihood of depression, anxiety, PTSD, drug abuse, alcohol abuse, and other major mental illnesses. An analysis of the data shows that while mental health and wellness issues are prevalent across all majors, specific disciplines appear to have very different mixes of conditions and issues affecting their students

A new theory driven model of authentic leadership

In recent years, the concept of Authentic Leadership has become an important area of interest and study, encompassing, as it does, personal beliefs and values and how they are aligned and lived in one’s everyday leadership experience, (Cooper et al. 2005; Avolio & Gardner, 2005; Luthans & Avolio, 2003). However, whilst the literature surrounding it is ever-increasing, the concept and construct of Authentic Leadership is fragmented; complicated by different theorists’ perspectives and compounded by a lack of empirical research, particularly within the UK, (Gardner et al. 2011).Based on Novicevic et al.’s (2006) conceptualization, differentiating Authentic Leadership between its psychological and philosophical components, this research presents a new theoretical model of Authentic Leadership. A 4-factor model was developed and empirically tested using a classic psychometric approach, (Nunnally, 1978; Kline, 1979), and a 360° feedback design, as leaders have been shown to over-estimate their self-reported scores compared to subordinate and peer feedback ratings, (Atkins & Wood, 2002).Critically, the model was developed and tested using real leaders rather than students, who are generally more accessible to researchers, (Lagan, 2007). It is hypothesized that the resulting model and statistical data may therefore have greater validity and applied relevance than other comparative research in the field completed utilizing student populations with little or no, real-world leadership experience. Three UK leadership populations were employed: two business leader samples and, for the validation study, senior serving Royal Air Force officers. A 3-factor model emerged which both simplifies and unifies previous theoretical conceptualisations of Authentic Leadership.Whilst not a direct part of the research study, the author suggests that potentially, all modern leadership failures may be traced back to a deficiency in any one of these 3 ‘Pillars’ of Authentic Leadership: Self-Awareness, Self-Regulation or Ethics. Implications for Authentic Leadership Development are identified and some suggestions for future research into the field made

Foraminiferal Populations of the Goodland Formation, Tarrant County, Texas

Recent studies of foraminiferal populations of the Gulf of Mexico made by Phleger (1951 and 1954), Parker, et al. (1953) , Lowman (1949), and Shepard and Moore (1955) show that different kinds of Foraminifera inhabit waters of different depth, salinity and temperature. These studies should provide evidence from which micropaleontologists may infer the nature of ancient environments, assuming always that fossil Foraminifera had the same habits as their nearest of kin in the modern assemblages. Albritton, et al. (1954) and Curtis (1955) have made quantitative studies of ancient populations, and have found that the Foraminifera tend to corroborate and supplement the chronicle of sedimentation as established on lithologic and other evidence

Engineering Professors’ Perspectives on Gender and Assessment of Teamwork

Teamwork is an important component of engineering education programs; however, when not facilitated well, it can be a site of gender biases. The aim of this article is to thematically explore what and how engineering professors think about gender in the assessment of teamwork. In 2014 and 2015, semi-structured interviews were conducted with 39 engineering professors in the United States. Interviews covered a wide range of topics, with one section of the interviews devoted to teamwork specifically. For this article, the parts of the interviews about assessment of teamwork are analyzed. It was found that most participants were unaware of the ways in which gender can influence assessment and did not attempt to mitigate biases in self-evaluation, peer-evaluation, or team presentations. Recommendations for best practice are offered

Engineering Students Coping With COVID-19: Yoga, Meditation, and Mental Health

In 2020, we conducted a nationwide online survey of undergraduate engineering students in the United States to examine how the novel coronavirus pandemic was affecting engineering students\u27 mental health and what strategies they were using to cope with mental health challenges. The survey was a compilation of validated mental health instruments that screen for depression, anxiety, somatoform disorders, eating disorders, non-specific psychological distress, and post-traumatic stress disorder. Given that prior research has shown that yoga and meditation can help people suffering from anxiety, depression, and post-traumatic stress disorder, we were interested in exploring the subset of respondents who said that they were using yoga and/or meditation to cope with mental health challenges during the pandemic. The research questions addressed in this paper are: 1) What are the demographic characteristics of students who used yoga and/or meditation to cope with mental health challenges of the 2020 novel coronavirus pandemic? and 2) Does the mental health of the students who used these strategies differ in any from the mental health of students who did not use yoga and meditation coping strategies? Based on 669 responses from students at 140 different universities, we found that there were 20 survey items for which the yoga/meditation group fared statistically significantly differently than the non-yoga/meditation group. These 20 items appeared in the screens for depression, anxiety, somatoform disorders, eating disorders, non-specific psychological distress, and post-traumatic stress disorder. For example, yoga and meditation practitioners were significantly less likely to have experienced feelings of hopelessness during the prior 30 days, as well as to have experienced feelings of being so depressed that nothing could cheer them up. A causative relationship cannot be claimed, but the correlations we found align with prior research showing that yoga and meditation can support many aspects of mental health