AIAA Design, Build, Fly: Aerodynamics

As part of the Santa Clara University Senior Design Project, the AIAA Design, Build, Fly: Aerodynamics team was responsible for designing and testing the wings, tail, and control surfaces of an aircraft designed to participate in future AIAA Design, Build, Fly competitions. Named Evergreen in honor of professor John J. Montgomery, the unmanned aerial vehicle was designed and constructed in collaboration with the AIAA Design, Build, Fly: Structures and Controls senior design team. Aiming to construct a competitive aircraft for the competition, the team decided that a target weight of approximately 3.5 kg and a cruise speed of 25 m/s would be the starting points of the design. For the general wing configuration, three options were considered: monoplane (low-wing), cantilever (high-wing), and biplane. The cantilever configuration presented the desired wing characteristics for this aircraft, such as higher lift, stability, and ease of manufacturing. To minimize wing loading and take-off speeds, a wingspan of 1.50 m was selected considering that the maximum dimension length permitted by the competition is 1.57 m (62 in). After conducting a selection study between several high-lift airfoils, the NACA 4416 airfoil would be the most suitable, with an optimal chord length of 0.3028 m due to the previously decided weight and velocity. For the wing control surfaces, a flaperon configuration was chosen instead of separate flap and aileron structures. Through the use of flaperons, the weight and complexity of the wing is reduced while maintaining the necessary functionality from the surfaces. To avoid unpredictable behavior due to vortices created at the inward tips of the flaperons, a maximum size of 42 cm was determined, which proved sufficient at providing relatively low take-off speeds (\u3c 15 m/s). In collaboration with the Structures and Controls team, the fuselage size was used to determine the optimal dimensions of the tail, minimizing drag and guaranteeing aircraft stability in all flight modes. For the stability study, XFLR5TM was utilized as it is a powerful tool that can accurately determine the stability of the aircraft in all eight relevant flight modes given the dimension of the wing, tail assembly, and the position of the center of gravity. For complete two and three-dimensional CFD analysis, SOLIDWORKSTM Flow Simulation and ANSYSTM Fluent were exploited in parallel between the many design iterations of the Evergreen, ensuring that the theoretical design produced the desired characteristics under simulated flight conditions. Through Flow Simulation, the sizing of the aerodynamic shape of the aircraft — wing and tail — proved sufficient to sustain the anticipated weight of the aircraft, and a flap deflection study provided security on the effectiveness of the flaps for lower takeoff speeds. Additionally, the CFD analysis was useful to estimate the forces and torques experiences by the control surfaces, which was in turn used by the Structures and Controls team to select the appropriate servo motors for each control surface. Once the design was deemed aerodynamically capable, the Evergreen was constructed as a joint effort of both teams. Containing minute differences in comparison to the CAD model of the aircraft, the Evergreen performed successfully in eight separate flights, satisfying the take-off distance, control, range, and payload capacity required by the competition. With the data provided in this project, the AIAA Design, Build, Fly: Aerodynamics team is confident that future generations of students can improve and adapt the Evergreen to compete for Santa Clara University

Using Body Mass Index to Identify Overweight Children: Barriers and Facilitators in Primary Care

Overweight is an increasingly prevalent pediatric health problem but is under-diagnosed. Despite recommendations endorsing the use of body mass index (BMI) to identify overweight children, clinicians seldom use BMI. Barriers to the use of BMI in pediatric primary care have not previously been described

Provider and client perspectives on maternity care in Namibia: results from two cross-sectional studies

Abstract Background Disrespectful and abusive maternity care is a complex phenomenon. In Namibia, HIV and high maternal mortality ratios make it vital to understand factors affecting maternity care quality. We report on two studies commissioned by Namibia’s Ministry of Health and Social Services. A health worker study examined cultural and structural factors that influence maternity care workers’ attitudes and practices, and a maternal and neonatal mortality study explored community perceptions about maternity care. Methods The health worker study involved medical officers, matrons, and registered or enrolled nurses working in Namibia’s 35 district and referral hospitals. The study included a survey (N = 281) and 19 focus group discussions. The community study conducted 12 focus groups in five southern regions with recently delivered mothers and relatives. Results Most participants in the health worker study were experienced maternity care nurses. One-third (31%) of survey respondents reported witnessing or knowing of client mistreatment at their hospital, about half (49%) agreed that “sometimes you have to yell at a woman in labor,” and a third (30%) agreed that pinching or slapping a laboring woman can make her push harder. Nurses were much more likely to agree with these statements than medical officers. Health workers’ commitment to babies’ welfare and stressful workloads were the two primary reasons cited to justify “harsh” behaviors. Respondents who were dissatisfied with their workload were twice as likely to approve of pinching or slapping. Half of the nurses surveyed (versus 14% of medical officers) reported providing care above or beneath their scope of work. The community focus group study identified 14 negative practices affecting clients’ maternity care experiences, including both systemic and health-worker-related practices. Conclusions Namibia’s public sector hospital maternity units confront health workers and clients with structural and cultural impediments to quality care. Negative interactions between health workers and laboring women were reported as common, despite high health worker commitment to babies’ welfare. Key recommendations include multicomponent interventions that address heavy workloads and other structural factors, educate communities and the media about maternity care and health workers’ roles, incorporate client-centered care into preservice education, and ensure ongoing health worker mentoring and supervision

HIV education in a Siberian prison colony for drug dependent males

AIM: To evaluate the effectiveness of an HIV peer training program conducted in a colony for drug dependent male prisoners in Siberia, Russia. METHOD: Questionnaires were used to collect data pre and post peer training sessions. Three peer training sessions were conducted between questionnaires. Fifteen to twenty inmates were trained as peer educators at each week-long health education training session. RESULTS: In 2000 and 2001, 153 and 124 inmates completed the questionnaire respectively. Respondents in both years reported similar health and injecting histories and comparable levels of sexual activity. Respondents in 2001 were significantly more likely to correctly identify both how HIV can and cannot be transmitted compared to respondents in 2000. The prevalence of tattooing in prison decreased significantly between questionnaires. However, there was virtually no reported use of bleach to clean tattooing or injecting equipment in either 2000 or 2001. Access to condoms increased significantly between questionnaires. CONCLUSIONS: While this training program was associated with improved HIV knowledge, the Ministry of Justice should consider improved and additional harm reduction strategies. These include increased availability of bleach and condoms and the introduction of methadone treatment and syringe exchange in prison

They “Miss More Than Anything Their Normal Life Back Home”: Masculinity and Extramarital Sex Among Mexican Migrants in Atlanta

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/72531/1/4102309.pd

The sexual behavior of married Mexican immigrant men in North Carolina

In the southern United States, North Carolina has attracted an unprecedented influx of Hispanic immigrants in the 1990s. Detailed data on the sexual behavior of these recent immigrants are lacking. This exploratory study used two methods, a survey and qualitative interviews. For both methods, participants were recruited using convenience sampling. All study participants were first-generation Mexican immigrants who had lived in North Carolina for at least six consecutive months. The survey, administered face-to-face, explored the sexual attitudes and behavior of 43 married Mexican men living in North Carolina. The qualitative interviews, conducted with men (n=20) and women (n=19), explored immigrants' perceptions of extramarital sex and sexually transmitted diseases (STDs). The study's results suggest that the sexual behavior of 'unaccompanied' married Mexican immigrant men, living alone in North Carolina, differs, at least in degree if not in kind, from that of 'accompanied' married men, residing in the state with their wives. Unaccompanied men who participated in the survey reported more lifetime sexual partners, more partners in the previous year, more extramarital partners and more contact with prostitutes than accompanied survey respondents. The qualitative interviews suggest that unaccompanied men's peculiar status as 'single' men in North Carolina may provide them with both motive and opportunity to have extramarital sexual relationships and that few married Mexican men and women perceive STDs as relevant to their lives. Overall, the study supports the need for male- and couple-focused STD prevention interventions for Hispanic immigrants.Sexually transmitted diseases Sexual behavior Immigrants Hispanics

Provider and client perspectives on maternity care in Namibia: results from two cross-sectional studies

Abstract Background Disrespectful and abusive maternity care is a complex phenomenon. In Namibia, HIV and high maternal mortality ratios make it vital to understand factors affecting maternity care quality. We report on two studies commissioned by Namibia’s Ministry of Health and Social Services. A health worker study examined cultural and structural factors that influence maternity care workers’ attitudes and practices, and a maternal and neonatal mortality study explored community perceptions about maternity care. Methods The health worker study involved medical officers, matrons, and registered or enrolled nurses working in Namibia’s 35 district and referral hospitals. The study included a survey (N = 281) and 19 focus group discussions. The community study conducted 12 focus groups in five southern regions with recently delivered mothers and relatives. Results Most participants in the health worker study were experienced maternity care nurses. One-third (31%) of survey respondents reported witnessing or knowing of client mistreatment at their hospital, about half (49%) agreed that “sometimes you have to yell at a woman in labor,” and a third (30%) agreed that pinching or slapping a laboring woman can make her push harder. Nurses were much more likely to agree with these statements than medical officers. Health workers’ commitment to babies’ welfare and stressful workloads were the two primary reasons cited to justify “harsh” behaviors. Respondents who were dissatisfied with their workload were twice as likely to approve of pinching or slapping. Half of the nurses surveyed (versus 14% of medical officers) reported providing care above or beneath their scope of work. The community focus group study identified 14 negative practices affecting clients’ maternity care experiences, including both systemic and health-worker-related practices. Conclusions Namibia’s public sector hospital maternity units confront health workers and clients with structural and cultural impediments to quality care. Negative interactions between health workers and laboring women were reported as common, despite high health worker commitment to babies’ welfare. Key recommendations include multicomponent interventions that address heavy workloads and other structural factors, educate communities and the media about maternity care and health workers’ roles, incorporate client-centered care into preservice education, and ensure ongoing health worker mentoring and supervision