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Phase behavior of hydrogen-light-hydrocarbon systems (1957)

Benham, A. L. ; Katz, D. L. ; Williams, R. B.

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 3 (1957), S. 236-241

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ISSN: 0001-1541

Keywords: Chemistry ; Chemical Engineering

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology

Notes: The decreasing solubility of hydrogen in hydrocarbons with decreasing temperature continues down to the freezing point of the hydrocarbons, around -300°F. This behavior is shown to be an enlargement of phenomena exhibited by normal hydrocarbon mixtures. Methods of predicting equilibrium-phase compositions are presented for hydrogen in ligh-hydrocarbon systems. The correlations are satisfactory for binary and certain ternary systems, but are not reliable for complex mixtures.

Additional Material: 18 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/aic.690030219

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Triaxial force transducer for investigating stresses at the stump/socket interface (1992)

Williams, R. B. ; Porter, D. ; Roberts, V. C. ; [et al.]

Springer

Medical & biological engineering & computing 30 (1992), S. 89-96

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ISSN: 1741-0444

Keywords: Lower-limb amputee ; Pressure ; Prosthetic interface ; Shear stress ; Transducer

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology , Medicine

Notes: Abstract Although normal pressures at the stump socket interface of the lowerlimb amputee have been investigated, little is known about the shear stresses that also occur. Studies suggest that the combination of both shear and normal stresses significantly exacerbates discomfort and vascular and tissue damage. A means of simultaneously measuring normal and shear stresses will aid in the investigation and improvement of prosthetic fit. A miniature triaxial force transducer (4·9×16 mm diameter) has been developed which can be recessed into the socket wall. The principle of operation, construction, performance and limitations of the device are described. Preliminary measurements of the interface stress variations over the gait cycle in a supra-condylar PTB socket are presented. These show clear differences in the stress patterns present when two different prosthetic feet are used.