Resistance ratio

Temperatures on the ITS-90 are expressed in terms of the ratio of the resistance of the SPRT at temperature to the resistance at the triple point of water. The resistance ratio W(V is calculated as... 

The temperature T q is calculated from the resistance-ratio relationship... 

Fig. 3.20. Thermal conductivity of copper samples with residual resistivity ratio (RRR) ranging from 3000...

By topical application, Katsuda et al. determined LD50 values of natural pyrethrins and several pyrethroids against the pyrethroid-susceptible CSMA strain and the pyrethroid-resistant Hiroyama strain of M. domestica. The resistant strain was originally collected in 1996 from a hog farm in Hiroyama, Niigata Prefecture. Their resistance ratios, R/S, are shown in Table 3. 

R r Electrical resistance Ratio of rates of change of bed density with velocity for two species (equation 6.44) W/A2 ml2t 3a... 

The (property/density) ratios show that the self-reinforced polypropylene is comparable to the general-purpose GMTs with a much higher impact resistance ratio. 

Ultrapure Th metal has been processed at the Ames Laboratory by solid-state electrotransport under very low pressures (on the order of 0.3 nPa), which has produced the purest Th metal known, that with a resistivity ratio of 4200 for doubly refined metal (99-101). This resistivity ratio of 4200 translates into probably <50 ppm total impurities in the metal (see footnote 1) (87-90, 104). Single crystals measuring 0.25 cm in diameter by 1.1 cm in length with resistivity ratios of 1700-1800 have also been grown (55). 

Siegel, R., Effect of distributor plate-to-bed resistance ratio on onset of fluidized bed channelling, A.I.Ch.E.]., 22 (1976) 590-592. 

The experiments were carried out on high purity aluminium from different producers (Table I) and Al-Ga alloys. The impurity concentration in the used materials was determined by glow discharge mass-spectrometry. The total impurity content in pure aluminium (0.4 - 7.7 ppm) was defined as the sum of the concentration of all found elements.The residual resistivity ratio RRR=p(273K)/p(4.2K) of the materials was measuredby the method prescribed by the U.S. National Bureau of Standards. 

Resist Ratio vs S102 Ratio vs SIO2 Rate vs S102 Q,C/cm ... 

Figure 1 The resistive ratio of solid mercury versus absolute temperature(uncorrected scale) as actually reported by H. Kamerlingh Onnes (1). This observation marked the discovery of superconductivity.

In their "SnO sample" they observed an abrupt change in the resistive ratio as a function of temperature (see Figure 6). 

Figure 11 The resistive ratio versus absolute temperature (T/K) for SrTiOs x, as published in Reference 54.

If the material exhibits slow polarization currents during switching, then the bridge technique fails, unless one uses an identical sample for the nuUing capacitance and employs a resistance ratio bridge. 

Here we will summarize, from the previous subsections as well as from literature, some typical properties and representative parameters (see table 6) of the superconducting state of YNi2B2C and LuNi2B2C where completeness is not attempted. These materials are usually clean-limit type II superconductors. However by substitutional disorder on the rare earth site in (Y,Lu)Ni2B2C or on the transition-metal site in Lu(Ni,Co)2B2C the residual resistance ratio RRR = p(300 K)/p(Tc), where p(T) is the normal state resistivity, and the mean free path / of the electrons in the normal state can be considerably reduced... 

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