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Cyanoethyl celluloses (CECs) with different degree of substitution (DS) were synthesized by homogeneous reaction of cellulose (cotton linter pulp and absorbent cotton) with acrylonitrile (AN) in LiOH/urea aqueous solutions. The reaction showed quick reactivity and high transfer efficiency of etherification agent. The DS values of CECs were controlled by varying the molar ratio of AN to anhydroglucose...
This paper reports a novel instrument for human current perception threshold (CPT) measurement. An objective galvanic skin response (GSR) method is employed to monitor subject's response to quantitative stimuli. Experimental results show that new system is more objective and easy to operate in comparison with conventional quantitative sensory testing systems
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