Knowledge modeling for software design

This paper develops a modeling framework for systems engineering that encompasses systems modeling, task modeling, and knowledge modeling, and allows knowledge engineering and software engineering to be seen as part of a unified developmental process. This framework is used to evaluate what novel contributions the 'knowledge engineering' paradigm has made and how these impact software engineering

Cruise Report W-45 : scientific activities undertaken aboard R/V Westward, Key West - Woods Hole, April 11 - May 23, 1979

The Strombus Expedition, Key West - Woods Hole, MA, April 11 - May 23, 1979This cruise report outlines the scientific activities for the Strombus Expedition, the forty-fifth cruise of the R/V Westward. These activities fall into two separate categories which, however, serve each other: a traditional academic program offered purely and directly for the students' scholastic benefit; and, a program of research and student projects in which the students' skill and drive and curiosity determined the scope and benefit of their participation

Investigations of the potential performance characteristics of selected contact lubricants for applications in miniature slip-ring capsules of the type used in ST 124 M stabilized inertial guidance platforms Final technical report, 27 Mar. 1968 - 30 Apr. 1970

Performance characteristics of liquid and solid lubricants for contacts of miniature slip-ring capsule

Recent evolution of an active barrier beach complex : Popponesset Beach, Cape Cod, Massachusetts

Popponesset Spit, the barrier beach sheltering Popponesset Bay on Cape Cod, Massachusetts, has experienced large changes in its location and shape over the past thirty years. Concern by the public over loss of this barrier beach and the associated recreational and wildlife resources, as well as its storm-protection function, resulted in a number of studies involving local, state and federal officials. The purpose of these studies was to identify causes and future trends (Benoit and Donahoe, 1979) and to identify engineering solutions to this instability (U.S. Army Corps of Engineers, 1972; Camp, Dresser and McKee, 1981). For various reasons, these studies were incomplete and stated some conclusions which were generally misleading or incorrect. The purpose of the present study was to provide a thorough reexamination of the geological problem at Popponesset Spit, to dispel the misconceptions and to more rigorously document the large-scale changes. The impetus for our concern over the beach was a desire to contribute to an effective, rational management and utilization strategy for this coastal region.Prepared for the Board of Seiectmen of the Town of Mashpee, Commonweaith, MA and for the Department of Commerce, NOAA Office of Sea Grant under Grant NA 80AA-0-00077

United We Serve: A Call To Universal Jewish Service

We have reached a turning point in American Jewish history. Now that large segments of our community are living successful, integrated lives, we have an opportunity to align ourselves behind service to enrich Jewish life and to effect prophetic change in the world. In Pirke Avot (Ethics of the Fathers), Rabbi Tarfon admonishes us, You are not obliged to finish the task, neither are you free to desist from it. The usual interpretation is that our task is bigger than any of us in terms of the quantity of work that must be done. Rabbi Tarfon\u27s dictum, however, also refers to the complexity of the task. We come to understand the critical interdependence of individuals, each bringing their own skills and varied perspectives to accomplish our people\u27s role in the covenant

Residual Toxicities of Insecticides to Cotton Insects.

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Sparking a Renewed Jewish Commitment to Service

Where do Jews stand in relation to service and what might a Jewish commitment to service look like? By reflecting on historical Jewish understandings of service, we hope to gain perspective on the present and the need to rejoin our concepts of God, service, and worship. Such explorations can spark a radical transformation of our social and communal norms

Stripes of Partially Fluorinated Alkyl Chains: Dipolar Langmuir Monolayers

Stripe-like domains of Langmuir monolayers formed by surfactants with partially fluorinated lipid anchors (F-alkyl lipids) are observed at the gas-liquid phase coexistence. The average periodicity of the stripes, measured by fluorescence microscopy, is in the micrometer range, varying between 2 and 8 microns. The observed stripe-like patterns are stabilized due to dipole-dipole interactions between terminal -CF3 groups. These interactions are particularly strong as compared with non-fluorinated lipids due to the low dielectric constant of the surrounding media (air). These long-range dipolar interactions tend to elongate the domains, in contrast to the line tension that tends to minimize the length of the domain boundary. This behavior should be compared with that of the lipid monolayer having alkyl chains, and which form spherical micro-domains (bubbles) at the gas-liquid coexistence. The measured stripe periodicity agrees quantitatively with a theoretical model. Moreover, the reduction in line tension by adding traces (0.1 mol fraction) of cholesterol results, as expected, in a decrease in the domain periodicity.Comment: 20 pages, 4 fig

Elasticity of an interfacial particle raft

We study the collective behaviour of a close packed monolayer of non-Brownian particles at a fluid-liquid interface. Such a particle raft forms a two-dimensional elastic solid and can support anisotropic stresses and strains, e.g. it buckles in uniaxial compression and cracks in tension. We characterise this solid in terms of a Young's modulus and Poisson ratio derived from simple theoretical considerations and show the validity of these estimates by using an experimental buckling assay to deduce the Young's modulus.Comment: 7 pages, 5 figure

Development of an Accelerated Test Design for Predicting the Service Life of the Solar Array at Mead, Nebraska

Potential long-term degradation modes for the two types of modules in the Mead array were determined and judgments were made as to those environmental stresses and combinations of stresses which accelerate the degradation of the power output. Hierarchical trees representing the severity of effects of stresses (test conditions) on eleven individual degradation modes were constructed and were pruned of tests judged to be nonessential. Composites of those trees were developed so that there is now one pruned tree covering eight degradation modes, another covering two degradation modes, and a third covering one degradation mode. These three composite trees form the basis for selection of test conditions in the final test plan which is now being prepared