Injector element characterization methodology

Characterization of liquid rocket engine injector elements is an important part of the development process for rocket engine combustion devices. Modern nonintrusive instrumentation for flow velocity and spray droplet size measurement, and automated, computer-controlled test facilities allow rapid, low-cost evaluation of injector element performance and behavior. Application of these methods in rocket engine development, paralleling their use in gas turbine engine development, will reduce rocket engine development cost and risk. The Alternate Turbopump (ATP) Hot Gas Systems (HGS) preburner injector elements were characterized using such methods, and the methodology and some of the results obtained will be shown

A Comparison of Wintering Bird Populations in Three Open Field Types in Central Ohio

Author Institution: Department of Zoology, The University of Illinois, Champaign, Illinoi

Construction professionals and management in English local government: a triangulated investigation

The Thesis focuses on architects, engineers and surveyors in English Local Government. The research question recognises difficulties these professionals can have in engaging with management approaches and practices. The Thesis begins with a case study and, following a literature research, employs informal and formal interviews, together with a questionnaire. The opportunity is taken to seed Vignettes drawn from personal and colleagues' experience, to provide a quasi- anthropological parallel commentary. Also of significance is the degree to which the writer has relied on his professional experience during the course of the research. This has influenced the methodology and the apphcation of surveying techniques, such as triangulation, has assisted the academic research. Experience has also influenced the style, presentation and use of language. Most significantly, it has resulted in a Thesis which is neither wholly theory driven nor wholly theory driving - it is a mixture of the two and draws strength and vigour from this hybridisation. From the research, which examined the issues in terms of the reasons behind the ambivalence of many professionals to management, the differences and similarities between the construction professionals and the role of context and contextual awareness, it emerged that an understanding of the internal and external context in which professions in local government work was of vital importance. Also important was the need for a shared lexicon and the recognition that management can be seen by professionals as a rival rather than complimentary systemised set of procedures. The writer has adopted an iterative and triangulated approach. The use of triangulation matures as the research proceeds and, together with the conclusions from the research question and lessons for management development of construction professionals, is offered as an output in its own right

(A) social work program for the larger rural parish ..

Typewritten sheets in cover. Thesis (M.A.)--Boston University This item was digitized by the Internet Archive. Bibliography: p. 53

Liquid fuel injection elements for rocket engines

Thrust chambers for liquid propellant rocket engines include three principal components. One of these components is an injector which contains a plurality of injection elements to meter the flow of propellants at a predetermined rate, and fuel to oxidizer mixture ratio, to introduce the mixture into the combustion chamber, and to cause them to be atomized within the combustion chamber so that even combustion takes place. Evolving from these injectors are tube injectors. These tube injectors have injection elements for injecting the oxidizer into the combustion chamber. The oxidizer and fuel must be metered at predetermined rates and mixture ratios in order to mix them within the combustion chamber so that combustion takes place smoothly and completely. Hence tube injectors are subject to improvement. An injection element for a liquid propellant rocket engine of the bipropellant type is provided which includes tangential fuel metering orifices, and a plurality of oxidizer tube injection elements whose injection tubes are also provided with tangential oxidizer entry slots and internal reed valves

When Consumer Behavior Goes Bad: An Investigation of Adolescent Shoplifting

Shoplifting is a troubling and widespread aspect of consumer behavior, particularly among adolescents, yet it has attracted little attention from consumer researchers. This article reports and interprets findings on the pervasiveness of shoplifting among adolescents, the characteristics that distinguish adolescent shoplifters from their nonshoplifting peers, and adolescents' views regarding the reasons for this behavior. Our findings contradict some popular stereotypes concerning the typical shoplifter and suggest some rethinking about adolescents' reasons for shoplifting

Cyclone: A close air support aircraft for tomorrow

To meet the threat of the battlefield of the future, the U.S. ground forces will require reliable air support. To provide this support, future aircrews demand a versatile close air support aircraft capable of delivering ordinance during the day, night, or in adverse weather with pin-point accuracy. The Cyclone aircraft meets these requirements, packing the 'punch' necessary to clear the way for effective ground operations. Possessing anti-armor, missile, and precision bombing capability, the Cyclone will counter the threat into the 21st Century. Here, it is shown that the Cyclone is a realistic, economical answer to the demand for a capable close air support aircraft