Aerodynamics of a finite wing with simulated ice

The effect of a simulated glaze ice accretion on the aerodynamic performance of a three-dimensional wing is studied experimentally. Results are reviewed from earlier two-dimensional tests which show the character of the large leading-edge separation bubbles caused by the simulated ice accretion. The 2-D bubbles are found to closely resemble well known airfoil laminar separation bubbles. For the 3-D experiments a semispan wing of effective aspect ratio five was mounted from the sidewall of the UIUC subsonic wind tunnel. The model uses a NACA 0012 airfoil section on a rectangular planform with interchangeable tip and root sections to allow for 0- and 30-degree sweep. A three-component sidewall balance was used to measure lift, drag and pitching moment on the clean and iced model. Fluorescent oil flow visualization has been performed on the iced model and reveals extensive spanwise and vortical flow in the separation bubble aft of the upper surface horn. Sidewall interaction and spanwise nonuniformity are also seen on the unswept model. Comparisons to the computed flow fields are shown. Results are also shown for roughness effects on the straight wing. Sand grain roughness on the ice shape is seen to have a different effect than isolated 3-D roughness elements

New Hampshire: a source book of instructional materials

Thesis (M.A.)--Boston University, 1947. This item was digitized by the Internet Archive

Attitudes and Roles of Women and Minorities in Community and Urban Forestry Professions

Community and urban forestry is a multifaceted field ranging from tree planting to removal, hazard assessment, and public relations. However, the racial and gender diversity of the community forestry workforce is remarkably low. To gain a better understanding of this lack of diversity, I surveyed professionals in two major community/urban forestry organizations. Age, income, and years in the profession were considered, along with education level, to determine if there is some underlying reason for low representation of women and minorities in the community/urban forestry field. I found that while white males dominated all work sectors (especially private organizations), women were concentrated in public or non-profit organizations holding positions in offices, education, or other jobs with extensive public interaction. Minorities held similar positions to women or were in entry level jobs and general tree care rather than in more professionally advanced positions. Attitudes regarding most aspects of the profession varied little based on sex or minority status, with only minor differences on advancement potential and salary

A Journey Toward Sustainable Behavior: A Project To Stimulate Reduced Electricity Consumption

Housing organizations continuously face competition from other providers of low to moderate-income residential housing. That competition motivates those agencies to perpetually search for cost savings methods, which will enable them to continue providing supportive services to their residents. Additionally, the government has entrusted certain agencies with substantial funding that can inspire the organization to search for ways to demonstrate they are competent shepherds of those resources. Given that Alpha Homes’ residents do not pay their electric bills, the fundamental question guiding this research was: could a housing organization significantly reduce the average tenant electricity usage through a combination of resident-focused Education, Economic Incentives, and Evaluation ? This quasi-experiment utilized a time series model, with multiple regression, that sought to determine if any or all of the treatments created a significant reduction in tenant electricity consumption. The results show an overall significant reduction, in monthly electricity consumption, of approximately 8 percent for the Education and Economic Incentive treatment groups, and 5.7% for the group that received both treatments, which provides support for continued program implementation. These data offer policymakers an option for the providing of services for their residents