Studies on the biological control of Fusarium.

Thesis (M.S.

Patterns in Group Involvement Experiences During College: Identifying a Taxonomy

This study explored whether latent phenomena could be identified to classify students based on their patterns of involvement in cocurricular group experiences. The sample was comprised of 11,209 seniors from 50 institutions. A total of 4 latent factors were identified and students were classified into one of 8 latent classes. Findings offer new analytic and conceptual approaches for use in college impact research as well as a useful heuristic tool to assist student affairs professionals in designing and targeting educational interventions

Advanced turboprop technology development

The efficiency of high-speed turboprop propulsion systems is considered with emphasis on fuel savings. Specific topics discussed include: (1) high efficiency and low noise of propeller design; (2) fuselage noise attenuation; (3) propeller and gear box maintenance; and (4) engine-airframe integration

Biodiversity, management and utilization of West African fishes

Biodiversity, Nature conservation, Fishery management, Fishery resources, Fish, WorldFish Center Contrib. No. 1718, Africa, west,

Exploring Relationships Between Fraternity and Sorority Membership and Socially Responsible Leadership

Membership in social fraternities and sororities provides a powerful platform for developing college students’ capacity for leadership. The existing knowledge regarding the extent to which it fulfills this goal, however, is relatively sparse. Much of the research on college student leadership relies on definitions that are inconsistent with contemporary conceptualizations. This study addresses this gap by looking at the leadership development of fraternity and sorority members using data from a national study grounded in the social change model. Results indicated fraternity and sorority members scored highest on the leadership value of commitment and lowest on the capacity to navigate change. Findings also revealed statistically significant differences across seven of eight leadership measures based on membership in sororities versus fraternities

Research in development: the approach of AAS

The CGIAR Research Program on Aquatic Agricultural Systems (AAS) is pursuing a Research in Development approach that emphasizes the importance of embedding research in the development context. Reflecting this emphasis the six elements of this approach are a commitment to people and place, participatory action research, gender transformative research, learning and networking, partnerships, and capacity building. It is through the careful pursuit of these six elements that we believe that the program will achieve the development outcomes we aspire to, and do so at scale

A piloted simulator study on augmentation systems to improve helicopter flying qualities in terrain flight

Four basic single-rotor helicopters, one teetering, on articulated, and two hingeless, which were found to have a variety of major deficiencies in a previous fixed-based simulator study, were selected as baseline configurations. The stability and control augmentation systems (SCAS) include simple control augmentation systems to decouple pitch and yaw responses due to collective input and to quicken the pitch and roll control responses; SCAS of rate-command type designed to optimize the sensitivity and damping and to decouple the pitch-roll due to aircraft angular tate; and attitude-command type SCAS. Pilot ratings and commentary are presented as well as performance data related to the task. SCAS control usages and their gain levels associated with specific rotor types are also discussed

Effects of rotor parameter variations on handling qualities of unaugmented helicopters in simulated terrain flight

A coordinated analysis and ground simulator experiment was performed to investigate the effects on single rotor helicopter handling qualities of systematic variations in the main rotor hinge restraint, hub hinge offset, pitch-flap coupling, and blade lock number. Teetering rotor, articulated rotor, and hingeless rotor helicopters were evaluated by research pilots in special low level flying tasks involving obstacle avoidance at 60 to 100 knots airspeed. The results of the experiment are in the form of pilot ratings, pilot commentary, and some objective performance measures. Criteria for damping and sensitivity are reexamined when combined with the additional factors of cross coupling due to pitch and roll rates, pitch coupling with collective pitch, and longitudinal static stability. Ratings obtained with and without motion are compared. Acceptable flying qualities were obtained within each rotor type by suitable adjustment of the hub parameters, however, pure teetering rotors were found to lack control power for the tasks. A limit for the coupling parameter L sub q/L sub p of 0.35 is suggested