Theories and experiments for determination of nonsteady loads on turbomachine blades

This thesis collates the state of the art for flow induced excitation in a turbomachine stage under subsonic incompressible flow conditions. Theoretical developments are considered first, beginning with the vortex theories of Kemp and Sears, Henderson, Horlock and Holmes. Actuator disk analyses of Whitehead, Henderson and Horlock, and Horlock, Greitzer and Henderson are then considered followed by field theories of Osborne, Warner and Steele. Computer programs based on these theories are described and detailed input/output instructions are given. Results of these theories are compared and the state of the art for theoretical prediction of nonsteady blade loading is discussed. It is concluded that the selection of an appropriate analysis is dependent on the stage geometry and on the type of excitation, i.e. low per revolution or nozzle passing excitation. The theoretical development of the hydraulic analogy is discussed. Experimental studies of turbomachine stage flow by Harleman and Ippen, Heen and Mann, Johnson, Bryant, Owczarek, and Rhomberg are described. The development of the RIT rotating water table is also described. Water table tests, designed to determine the agreement between theoretically and experimentally predicted nonsteady loading of turbomachine blades are described and sample results are given. It is concluded that the nonsteady blade loading results obtained from water table tests compare favorably with those obtained from state of the art theoretical analyses for nozzle exit Mach numbers above 0.5. For Mach numbers below this value viscous effects become significant, and further studies to evaluate the accuracy of the hydraulic analogy under such conditions are recommended

How to foster wholesome racial attitudes in children ..

Typewritten sheets in cover. Appendix, 4 p. Extra title page for bibliography inserted between p. 71 and 72. Thesis (M.A.)--Boston University This item was digitized by the Internet Archive. Bibliography: p. 72-78

Using Reasons for Living to Connect to American Indian Healing Traditions

Responding to high rates of suicide for American Indian youth, helping professionals often struggle to connect healing traditions from American Indian cultures to tools from European psychology. The differences between American Indian healing and European therapy can be vast. Finding connections or building bridges between these two perspectives may be more difficult than it appears (Duran & Duran, 1995). One method to bring together these worldviews is to use the Reasons for Living Questionnaire (RFL, Linehan, Goldstein, Nielsen, & Chiles, 1983); the Reasons for Living Inventory for Adolescents (RFL-A, Osman, Downs, Kopper, Barios, Besett, Linehan, Baker, & Osman, 1998), or other psychological assessments developed using the RFL as a foundation. Reasons for Living (RFL) assessments have emerged as powerful strength based tools for assessing suicide risk (Range & Knott, 1997). RFL and RFL-A factors link to a relational worldview common to most American Indian people. A relational worldview considers a balance between forces often identified as spirit, context, mind, and body (Cross, 1998). Using RFL or RFL-A in suicide assessments allows practitioners to assess where youth may be out of balance in one or more of the four traditional areas: spirit, context, mind, and body. This may assist specific referrals to culturally appropriate healing. RFL and RFL-A assessments could be augmented to improve their correspondence to the relational worldview

Non-random walks in monkeys and humans

Principles of self-organization play an increasingly central role in models of human activity. Notably, individual human displacements exhibit strongly recurrent patterns that are characterized by scaling laws and can be mechanistically modelled as self-attracting walks. Recurrence is not, however, unique to human displacements. Here we report that the mobility patterns of wild capuchin monkeys are not random walks and exhibit recurrence properties similar to those of cell phone users, suggesting spatial cognition mechanisms shared with humans. We also show that the highly uneven visitation patterns within monkey home ranges are not entirely self-generated but are forced by spatio-temporal habitat heterogeneities. If models of human mobility are to become useful tools for predictive purposes, they will need to consider the interaction between memory and environmental heterogeneities.Comment: 18 pages, 3 figure

Using optimal foraging theory to infer how groups make collective decisions

A growing body of evidence emerging from the analysis of advanced animal tracking data shows that moving groups make shared decisions about where to go, with each group member influencing the outcome. How groups coordinate departure decisions (when to go), however, remains poorly understood. Classic models from optimal foraging theory, specifically the marginal value theorem (MVT), are well-established tools that can generate quantitative predictions about when individuals should prefer to leave a food patch, given patch quality and the distribution of patches in the environment. Integrating optimal foraging theory into studies of animal collectives provides rich opportunities for gaining new insights from both empirical and theoretical studies. Specifically, the MVT can be used to make predictions about conflict of interests among group members, how consensus costs vary under different models of collective decision-making, and under what environmental conditions shared decision-making may be favored or disfavored

Detroit Unveiled: A Graphic and Startling Revelation of Michigan’s Metropolis

Detroit Unveiled by Frederic S. Crofoot, is the latest addition to sensational literature. The author has been exploring the muddy by-paths and crooked lanes running through the dark side of Detroit\u27s social world, and gives his curious experience in a terse, well written style. The book is illustrated with some well executed engravings and is neatly bound.https://scholar.uwindsor.ca/swoda-windsor-region/1002/thumbnail.jp

Evidence-Based Educational Modules on the Safe Delivery of Anesthesia in MRI Suites

Few citations were located on the formal education on MRI patient safety for anesthesia providers administering anesthesia services in MRI suites. Consequently, patients and staff may be at risk for injury or death during MRI procedures and health care institutions can be threatened with financial loss secondary to legal exposure, equipment damage and resultant morbidity and mortality associated with MRI patient safety events. This doctoral project will create three evidence-based continuing education modules to educate anesthesia providers on the operation of the MRI unit, potential MRI associated risks and complications, and specific anesthesia considerations for providers assigned to the MRI suite for procedural care. Safety threats and injuries are confirmed in the literature and include the creation of projectiles within the MRI suite, patient burns, and death within the MRI unit itself. Integrating the three newly created evidence-based educational modules into health care quality improvement programs and required employee annual training events could improve provider preparedness and patient safety in the MRI suite