Superconductivity - Residual resistance ratio measurement. Residual resistance ratio of Nb-Ti and Nb3Sn composite superconductorsWhat is BS EN IEC 61788 4 about? BS EN IEC 61788 4 is the fourth part of a multi series that specifies a test method for the determination of the residual resistance ratio (RRR) of Nb Ti and Nb3Sn composite superconductors with Cu, Cu Ni, Cu Cu Ni, and Al a matrix in a strain free condition and zero external magnetic fields. The methods described in BS EN IEC 61788 4 are intended for use with superconductor specimens that have a monolithic structure

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The following technical modifications have been introduced and BS EN 755-1 contains:

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it should be noted that their accuracy in use is dependent upon the flatness of the surfaces on which they are used

plate girders and hollow sections acting compositely with reinforced concrete slab

by EU Directive 2010/75/EC on industrial emissions

It does not apply to water-tube boilers

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Correlation studies between this method and EN ISO 5165:1998 [3] have been done and the results of this are incorporated in BS EN 16144

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