Development of stitching reinforcement for transport wing panels

The NASA Advanced Composites Technology (ACT) program has the objective of providing the technology required to obtain the full benefit of weight savings and performance improvements offered by composite primary aircraft structures. Achieving the objective is dependent upon developing composite materials and structures which are damage tolerant and economical to manufacture. Researchers are investigating stitching reinforcement combined with resin transfer molding to produce materials meeting the ACT program objective. Research is aimed at materials, processes, and structural concepts for application in both transport wings and fuselages, but the emphasis to date has been on wing panels. Empirical guidelines are being established for stitching reinforcement in structures designed for heavy loads. Results are presented from evaluation tests investigating stitching types, threads, and density (penetrations per square inch). Tension strength, compression strength, and compression after impact data are reported

Measuring the Values for Time

Most economic models for time allocation ignore constraints on what people can actually do with their time. Economists recently have emphasized the importance of considering prior consumption commitments that constrain behavior. This research develops a new model for time valuation that uses time commitments to distinguish consumers' choice margins and the different values of time these imply. The model is estimated using a new survey that elicits revealed and stated preference data on household time allocation. The empirical results support the framework and find an increasing marginal opportunity cost of time as longer time blocks are used.

Situation

https://digitalcommons.library.umaine.edu/mmb-vp/6346/thumbnail.jp

The Fickle Weather Vane : Tita

https://digitalcommons.library.umaine.edu/mmb-vp/5717/thumbnail.jp

Farewell, Prosperity!

https://digitalcommons.library.umaine.edu/mmb-vp/6440/thumbnail.jp

You Are All The World To Me.

https://digitalcommons.library.umaine.edu/mmb-vp/5562/thumbnail.jp

European Americans and Women/Gender Issues

This issue brief outlines the involvement of European Americans (white) women in the three phases of the feminist movement in the United States and offers that white women controlled the direction of the movement during the first and second phases. This brief also discusses contemporary feminist movement organizing during what is currently called the third phase. It offers examples of "barriers" being eradicated and "bridges" that are being built between white (majority) and non-white (minority) women

Farewell, Prosperity!

https://digitalcommons.library.umaine.edu/mmb-vp/3898/thumbnail.jp

Life Is A See Saw : Duet, Marco & Muriel

https://digitalcommons.library.umaine.edu/mmb-vp/1981/thumbnail.jp