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Full-Text Articles in Mechanical Engineering

Saving Energy In Rural Maine : Or Who's Doing What On The Farm, Mane Department Of Agriculture Jan 1983

Saving Energy In Rural Maine : Or Who's Doing What On The Farm, Mane Department Of Agriculture

Maine Collection

Saving Energy In Rural Maine : Or Who's Doing What on the Farm

Compiled by Bettina M. Blanchard and Edited by Bill Seekins.

Maine Department of Agriculture, Food and Rural Resources, Division of Resources Development, Augusta, Maine, 1983.

Contents: List of Photographs and Diagrams / Introduction / Projects / 1. Wind / 2. Wood Heat Applications On the Farm / 3. Solar Applications / 4. Manure Handling and Waste Utilization / 5. Energy Efficient Cooling Methods / 6. Energy Saving In Field Operations / 7. Production and Use of Alternative Fuels / 8. Multi-Project Sites / Summary and Conclusions / Appendix / Bibliography


Effects Of Microstructure On The Speed And Attenuation Of Elastic Waves: Formal Theory And Simple Approximations, J. E. Gubernatis, E. Domany Jan 1983

Effects Of Microstructure On The Speed And Attenuation Of Elastic Waves: Formal Theory And Simple Approximations, J. E. Gubernatis, E. Domany

Review of Progress in Quantitative Nondestructive Evaluation

The sensitivity of the propagation of an elastic wave to changes in the microstructural details of a material is well known.1 In particular, numerous experiments have shown that the attenuation of the wave is sensitive to the inclusions, voids, cracks, grain boundaries, twin boundaries, interphase boundaries, magnetic domain walls, dislocations, substitutional impurities of a material. For attenuation studies in metals, ceramics and polycrystals, three formulas, each for different wavelength regimes, are generally used in the quantitative interpretation of experimental results.1–3 If λ is the wavelength of the elastic wave and is the average grain diameter, then in ...


On The Estimation Of Porosity In Composites By Oblique Angle Illumination, A. C. Kak, Mani Azimi, Malcolm Slaney Jan 1983

On The Estimation Of Porosity In Composites By Oblique Angle Illumination, A. C. Kak, Mani Azimi, Malcolm Slaney

Review of Progress in Quantitative Nondestructive Evaluation

Reported here are some preliminary computer simulation results on the feasibility of using oblique incidence ultrasound for the detection and estimation of porosity in composites. In the oblique incidence approach, the composite is illuminated at off normal angles in such a manner that the reflected returns from the fibers are in directions away from the illuminating transducer. Since the scattered returns from porosity tend to be more omnidirectional than the fiber returns, there is a larger received signal in the presence of porosity.