Archaeological Wood - Analytical Chemistry (ACS Publications)

May 30, 2012 - Anal. Chem. , 1990, 62 (14), pp 801A–801A. DOI: 10.1021/ac00213a736. Publication Date: July 1990. ACS Legacy Archive. Note: In lieu o...
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mentary fuzzy set operations. For in­ stance, the abstracted library spectrum in Figure 8a can be compared with a sample spectrum in Figure 8b by fuzzy intersection. Thus a spectral library search can be performed with a higher matching rate than those of methods

that use conventional similarity or dis­ tance measures. F u z z y d a t a analysis The uncertainty of experimental ob­ servations can also be expressed by fuzzy sets. A difference from statistical

Archaeological Wood Properties, Chemistry, and Preservation

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cientists can gain valuable information about the past by studying wooden arti­ facts. This new volume-the first of its kind-is truly unique in that it combines chemistry with techniques of preserving archaeological wood. Perfect as a reference source for anyone in this field, this 488-page volume reveals pres­ ent knowledge of the structure of wood and the mechanisms of its degradation. Seventeen chapters cover topics within these general categories: • • • • •

Figure 7. Kosko's Bidirectional Associative Memory (BAM) consisting of the neuron input field F A and output neurons F B interconnected symmetrically by the synapses.

properties and chemistry overview of preservation preservation of waterlogged wood preservation of dry wood future research

Specific areas discussed include the chemical composition of wood and changes brought on by the decay process, biopredators, radiation curing, freeze-drying, chemical preservation techniques, museum environments, the ethics of conservation, and value systems for choos­ ing among the qualities of wood that can be preserved. Contents Scope and History of Archaeological Wood · Structure and Degrada­ tion, Waterlogged Wood · Structure and Aging, Dry Wood · Physical and Mechanical Properties * Chemistry of Archaeological Wood · Bio­ logical Degradation of Wood • Treatments for Waterlogged and Dry Wood · Polyethylene Glycol Preservation Method · Radiation-Curing Monomers and Resins «Application of Freeze-Drying Outdoor Wood Weathering and Protection · Consolidation Systems for Degraded Wood • Impregnation With Thermoplastic Resins * Giuing of Archaeo­ logical Wood * Exhibition and Storage · Chemical Modification of Cell Wall Polymers · New Directions in Conservation

Roger M. Rowell, Editor, U.S. Department of Agriculture R. James Barbour, Editor, Forintek Canada Corporation Developed from a symposium sponsored by the Cellu­ lose, Paper and Textile Division of the American Chem­ ical Society Advances in Chemistry Series No. 225 488 pages (1990) Clothbound ISBN 0-8412-1623-1 LC 89-39451 $79.95 Ο · R · D · Ε · R

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Figure 8. Representation of U V spectra in a fuzzy neural network, the adaptive BAM. (a) Spectra recorded under different experimental conditions are stored as fuzzy sets in the neuron fields F A and F B . (b) Crisp sample spectrum presented to the neural network for comparison with the stored fuzzy spectra.

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ANALYTICAL CHEMISTRY, VOL. 62, NO. 14, JULY 15, 1990 · 801 A