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A mixed method for the creep of a skin layer (1994)

Li-du, Huang ; Qin-que, Wang ; Arthur, Mak Fak-tat

Springer

Applied mathematics and mechanics 15 (1994), S. 1131-1138

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ISSN: 1573-2754

Keywords: biomechanics ; soft tissue ; mixture theory ; creep ; mixed method

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics

Notes: Abstract The creep of a skin layer under a distributed surface pressure was solved by an analytical method using Hankel transform and Laplace transform. The surface stress boundary conditions lead to a Volterra integral equation of the first kind, which was then solved by a numerical method. The IMSL subroutines DINLAP and DGQRUL were employed to numerically obtain the Hankel-Laplace inversion. The calculated displacements at two distinctive moments were compared respectively with those obtained by an elastic solution for either incompressible or compressible solid. The transient creep responses of the skin layer were also presented.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02451984

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Structure determination of a new saponin from the plant Alphitonia zizyphoides by NMR spectroscopy (1993)

Perera, Premila ; Andersson, Rolf ; Bohlin, Lars ; [et al.]

Chichester : Wiley-Blackwell

Organic Magnetic Resonance 31 (1993), S. 472-480

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ISSN: 0749-1581

Keywords: Alphitonia zizyphoides ; Saponin ; 2D NMR ; INADEQUATE ; Molecular structure ; Computerized spectral analysis ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: High-field NMR experiments, including the 2D INADEQUATE technique coupled with a computerized spectral analysis, were used to determine the full structure of a new saponin extracted from a plant (Alphitonia zizyphoides) found in the Samoan rain forests. The saponin, which shows significant pharmacological activity, consists of an aglycone framework of six rings (three saturated six-membered rings, two oxygen-containing five-membered rings and a five-membered carbon ring) to which are attached four sugar units and a six-carbon side-chain. The INADEQUATE experiment, which was carried out on 60 mg of sample, provided absolute confirmation of the assignments for 35 of the possible 53 C—C bonds from the 13C-13C connectivities.

Additional Material: 10 Ill.