Investigation of positive shaft seals

Welded metal bellows secondary seals prevent secondary seal leakage with a minimum number of potential leak paths. High performance seal is obtained by controlling the potentially unstable seal-face movements induced by mechanical vibrations and fluid pressure pulsations

Social Network Analysis: A New Tool For Understanding Individual and Family Functioning

During the last decade, social work, along with the other helping professions, has moved toward conceptualizing practice within a social systems framework. Intrapsychic variables are still important but, increasingly, the emphasis is on the clients\u27 intimate social network as both cause and solution of a wide range of social problems. It is now widely believed that clients\u27 well-being is enhanced when system functioning is enhanced (Gitterman and Germain, 1976). Most of what social workers know about social systems theory comes from the sociological literature, particularly the social action system of Talcott Parsons. Although this orientation has great heuristic value for social work practice, it has been limited in its ability to generate new practice theory because of its high level of generality. For social workers, like sociologists before them, Parsonian systems theory has proved so difficult to operationalize that the hoped-for linkages and the anticipated development of new theory from the general theory have not materialized (Pfouts and Galinsky, 1976). The authors believe that an important movement towards clarification of system properties and relationships is currently under way in the form of social network analysis. In recent years, a number of researchers from a variety of disciplines have explored the use of social networks and the specific properties of those networks as a means of operationalizing and expanding upon our intuitive understanding of the importance of social bonds. The result of this effort is a growing body of knowledge which draws not only upon systems theory but also upon previous research in other areas such as kinship, support systems, adaptation to stress, organizational theory, and information exchange

Materials for Advanced Turbine Engines

An attempt was made to improve methods for producing powder metallurgy aircraft gas turbine engine parts from the nickel base superalloy known as Rene 95. The parts produced were the high pressure turbine aft shaft for the CF6-50 engine and the stages 5 through 9 compressor disk forgings for the CFM56/F101 engines. A 50% cost reduction was achieved as compared to conventional cast and wrought processing practices. An integrated effort involving several powder producers and a major forging source were included

Social Work Theories and Practice with Battered Women: A Conflict-of-Values Analysis

In the 1970s, wife abuse became a concern of sociologists, feminists, and family theorists. The new perspectives they brought to the problem, which focused more on social factors than on individual pathology, challenged social workers to examine how their practice and assumptions perpetuated the problem. This article investigates how the social work literature has been affected by new theories of domestic violence and analyzes the impact that these theories have had on practice with battered women.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67024/2/10.1177_088610998700200205.pd

Engolo and Capoeira. From Ethnic to Diasporic Combat Games in the Southern Atlantic

This article provides a re-examination of the main Afrocentric narrative of capoeira origins, the engolo or ‘Zebra Dance’, in light of historical primary sources and new ethnographic evidence gathered during fieldwork in south-west Angola. By examining engolo’s bodily techniques, its socio-historical context and cultural meanings, the piece emphasises its insertion into a pastoral lifestyle and highlights the relatively narrow ethnic character of the practice in Angola. This analysis and the comparison with capoeira helps us to develop certain hypotheses about the formation, migration, and re-invention of diasporic combat games between southern Angola and coastal Brazil, and more broadly, to increase our understanding of how African cultures spread across the southern Atlantic

Sodium testing of intermediate-size inducer pump in SPTF at ETEC

The overall test program includes pump assembly, installation, testing, removal from the test loop, disassembly and final inspection of the entire pump. Testing will include checkout tests, head/flow and efficiency characterizations at selected speeds and sodium temperatures, suction performance determination, a 2000 hour design point endurance test, a 300 hour off design endurance test, and thermal transient tests. The pump will be cleaned of sodium, disassembled, and examined before the 2000 hour endurance test and after the thermal transient tests to determine the effects that long-term operation at 200 percent NPSH margin and off design operation at the same flow and NPSH have on the pump components

Sodium testing of intermediate-size inducer pump in SPTF at ETEC

The overall test program includes pump assembly, installation, testing, removal from the test loop, disassembly and final inspection of the entire pump. Testing will include checkout tests, head/flow and efficiency characterizations at selected speeds and sodium temperatures, suction performance determination, a 2000 hour design point endurance test, a 300 hour off design endurance test, and thermal transient tests. The pump will be cleaned of sodium, disassembled, and examined before the 2000 hour endurance test and after the thermal transient tests to determine the effects that long-term operation at 200 percent NPSH margin and off design operation at the same flow and NPSH have on the pump components