Advanced study of video signal processing in low signal to noise environments Semiannual progress report, 1967 - 1968

Parameter space calculation for phase lock loop operation in low signal to noise environmen

Inorganic analysis in a controlled ecological life support system

Techniques useful for the elemental analysis of samples of types which might require analysis within a controlled ecological life support system are investigated

Guiding the development of a controlled ecological life support system

The workshop is reported which was held to establish guidelines for future development of ecological support systems, and to develop a group of researchers who understand the interdisciplinary requirements of the overall program

Controlled Ecological Life Support System: Research and Development Guidelines

Results of a workshop designed to provide a base for initiating a program of research and development of controlled ecological life support systems (CELSS) are summarized. Included are an evaluation of a ground based manned demonstration as a milestone in CELSS development, and a discussion of development requirements for a successful ground based CELSS demonstration. Research recommendations are presented concerning the following topics: nutrition and food processing, food production, waste processing, systems engineering and modelling, and ecology-systems safety

Behavior of composite/metal aircraft structural elements and components under crash type loads: What are they telling us

Failure behavior results are presented from crash dynamics research using concepts of aircraft elements and substructure not necessarily designed or optimized for energy absorption or crash loading considerations. To achieve desired new designs which incorporate improved energy absorption capabilities often requires an understanding of how more conventional designs behave under crash loadings. Experimental and analytical data are presented which indicate some general trends in the failure behavior of a class of composite structures which include individual fuselage frames, skeleton subfloors with stringers and floor beams but without skin covering, and subfloors with skin added to the frame-stringer arrangement. Although the behavior is complex, a strong similarity in the static and dynamic failure behavior among these structures is illustrated through photographs of the experimental results and through analytical data of generic composite structural models. It is believed that the similarity in behavior is giving the designer and dynamists much information about what to expect in the crash behavior of these structures and can guide designs for improving the energy absorption and crash behavior of such structures

Helicopter crashworthiness research program

Results are presented from the U.S. Army-Aerostructures Directorate/NASA-Langley Research Center joint research program on helicopter crashworthiness. Through the on-going research program an in-depth understanding was developed on the cause/effect relationships between material and architectural variables and the energy-absorption capability of composite material and structure. Composite materials were found to be efficient energy absorbers. Graphite/epoxy subfloor structures were more efficient energy absorbers than comparable structures fabricated from Kevlar or aluminum. An accurate method predicting the energy-absorption capability of beams was developed

A Strategic View of Resources

The resource-based view of a business is focused on resources as strengths within an organization that can generate sustained competitive advantage. The strengths are assembled and mobilized via strategic human resource management activities to support the probability of success. This study provides information to business owners as to whether investment in salaries paid to employees and business owners\u27 experiences will be instrumental in predicting business success. Findings suggest salaries paid to employees and business owners\u27 experiences are statistically significant and somewhat practically significant in predicting business success as defined by revenues

The FDM demodulating characteristics of non-linear phase-locked loops

FDM demodulation characteristics of nonlinear phase locked loop