Areas of Seal R/D at GE

About four years ago, work was completed on a 36 inch diameter gas to gas carbon ring seal used to buffer low pressure turbine air at the rim of the forward outer flowpath on the GE36 unducted fan (UDF) engine. At about the same time, we were developing a long life counter-rotating intershaft air-oil seal of approximately 7.6 inch diameter for operation at 800 fps, 800 F, and 50 psid. Although we were successful in meeting most program goals with a split ring seal of the axial bushing type, the seal with the greatest payoff in life and air leakage rates, bearing many features in common with the GE36 seal, could not be successfully tested because of the structural weakness of the primary seal ring carbon material. This was a split ring seal using a hybrid combination of orifice compensated hydrostatic and shrouded hydrodynamic gas bearings. We are presently working to develop this design in conjunction with high strength materials being developed by Pure Carbon Co. In the area of engine secondary gas flow path-sealing for performance improvement, we are currently working with carbon and all metal face seals. A 15 inch diameter all metal 'aspirating' face seal, using self-acting hydrostatic bearings, was successfully tested to 700 fps, 100 psid, and 1000 F, demonstrating long life at flow reduction of 86 percent compared to a 'best' labyrinth. This seal will be developed through 1400 F, 900 fps, and 350 psid. The seal 'aspirates' closed at about idle speed pressure during engine start and reopens at engine shutdown. A hydraulic thrust balance seal, currently using orifice compensated hydrostatics, is under development. Other aspects of these projects are briefly covered

Micro-organism distribution sampling for bioassays

Purpose of sampling distribution is to characterize sample-to-sample variation so statistical tests may be applied, to estimate error due to sampling (confidence limits) and to evaluate observed differences between samples. Distribution could be used for bioassays taken in hospitals, breweries, food-processing plants, and pharmaceutical plants

09-07 "Getting Past "Rational Man/Emotional Woman": How Far Have Research Programs in Happiness and Interpersonal Relations Progressed?"

Orthodox neoclassical economics portrays reason as far more important than emotion, autonomy as more characteristic of economic life than social connection, and, more generally, things culturally and cognitively associated with masculinity as more central than things associated with femininity. Research from contemporary neuroscience suggests that such biases are related to certain automatic processes in the brain, and feminist scholarship suggests ways of getting beyond them. The "happiness" and "interpersonal relations" research programs have made substantial progress in overcoming a number these biases. Analysis from a feminist economics perspective suggests, however, several fronts on which research could most profitably continue.

07-03 "Economists, Value Judgments, and Climate Change: A View from Feminist Economics"

A number of recent discussions about ethical issues in climate change, as engaged in by economists, have focused on the value of the parameter representing the rate of time preference within models of optimal growth. This essay examines many economists’ antipathy to serious discussion of ethical matters, and suggests that the avoidance of questions of intergenerational equity is related to another set of value judgments concerning the quality and objectivity of economic practice. Using insights from feminist philosophy of science and research on high reliability organizations, this essay argues that a more ethically transparent, real-world-oriented, and flexible economic practice would lead to more strongly objective, reliable, and useful knowledge.

03-11 "Clocks, Creation, and Clarity: Insights on Ethics and Economics from a Feminist Perspective"

This essay discusses the origins, biases, and effects on contemporary discussions of economics and ethics of the unexamined use of the metaphor “an economy is a machine.” The neoliberal view that the self-regulated workings of free markets should be kept free of impediments is based on this metaphor. Many of the critiques of capitalist systems are, as well. The belief that economists simply uncover universal “laws of motion” of economies, however, is shown to be based on a variety of rationalist thinking that—while widely held—is inadequate for explaining lived human experience. Feminist scholarship in philosophy of science and economics has brought to light some of the biases that have supported the mechanistic worldview. By structuring thought and language in dualistic categories such that alternatives to a mechanistic worldview are labeled as “soft,” the mechanistic view maintains some of its power by seeming “masculine” and “tough.” Possible alternatives to the “an economy is a machine” metaphor are discussed in their relation to developments in philosophy, psychology, and the natural sciences. The essay argues that metaphors such as “an economy is a creative process” and “an economy is an organism” are both intellectually defensible as guides to scientific inquiry and provide a richer ground for moral imagination.