Temperature-dependent curves

Comparison of the data shown in Figure 10 with d values from the diffraction pattern in Figure 11 indicate (Figure 11a) that the mesomorphous component (a narrow reflex), d, is independent of poly(decamethylcyclohexasiloxane) chain tacticity. Hence, irrespective of trans-tactic polymer abi-lity to crystallization, the mesophase temperature range changes insignificantly. At lower tempera-ture of -73°C only, a bending on the temperature dependence curve, d(T), of the mesophase peak occurs. 

Fig. 4.20 Monkman-Grant curves for two commercial grades of silicon nitride. Some grades give curves that are temperature-independent (a) AY6, SiC -reinforced others give a series of curves depending on temperature (b) NT154. The temperature independent curves have creep rate exponents, m, for the Monkman-Grant equation, tf = ce L, that are approximately 1, whereas the creep rate exponent for the temperature-dependent curves are greater than 1 e.g., 1.7 for NT154.

The results of this experiment (Fig. 3) confirmed their suggestion the experimental points practically coincide with the temperature dependence curve of water vapor pressure, especially if one takes into account that the accuracy of the determinatbn of the celt opening temperature was 2"C... 

The films consist of a number of grains or nanoinclusions, each of which has an individual transition temperature, which leads to the hysteresis loop broadening. If the phase transition temperature could be determined as a point, where the temperature dependence curve has a maximal slope, then in our case it is equal to 58 °C. As a result, the VO2 thin films do not demonstrate a sharp change of electrical conductance characteristics at the phase transition, and the hysteresis is sufficiently large. 

Stabilization is a result of spontaneous structural changes, through which the substance passes from the non-equilibrium state into the metastable one. The transformation range is a temperature region within which the changes occur at a measurable rate. The transformation point appears on the temperature dependence curve of the particular property at a temperature where the time required for a distinct change in property is commensurable with the period for which the glass is held at this temperature. 

The experimental protonic conductivity versus temperature dependence curves [Pg.436]

The internal field at Sn nuclei in face-centred cubic cobalt metal falls from -22 kG at 4-2 K to -10 kG at 500 K [248]. Above 800 K the field increases in value again, and it is believed that the smooth temperature-dependence curve (Fig. 14.15), which was drawn assuming that the value of the field at first decreases and then reverses in sign at about 700 K, to approach a new positive maximum at 1100 K, is genuine [249]. 

The slope of the temperature-dependent curve gives the entropy for the determining unfolding reaction dAG/dT = —AS). From AG and AS, the enthalpy of the unfolding reaction can be directly computed (AG = AH — TAS). The melting temperature can be estimated by extrapolating the plot of AG vs T to zero AG (see Fig. 4). Thus HX measured as a function of temperature well below the Tm can provide all of the usual thermodynamic parameters. In addition, the denaturant dependence gives the structural parameter, m. 

Fig. 13. Temperature dependence of alkali metal splittings. Dashed lines give the predicted temperature dependence curves calculated by using the two-jump models with the constants aA=0-01 mT and 03=0.27 mT (curve 2) aA=-0.01mT and a = 0.26 mT (curve 3) and =0.02 mT and 03=0.22 mT (curve 4). The other lines were drawn to fit the experimental values smoothly. 1) Cs-xanthenone, MTHF 2) Cs-xanthenone, THF 3) Cs-xanthenone, DMOE 4) Na-xanthenone, THF 5) Cs-fluorenone, THF 6) Na-fluorenone, THF 7) Cs-fluorenone, DMOE S) Li-xanthenone, DMOE 9) Li-xanthe-none, THF JO) Li-fluorenone, THF 11) Li-fluore-none, MTHF [71Chel].

On the other hand, plot of t5 P in the compact form on the reduced temperature scale did not fit to the theoretiC6il curve with Xp/ Xp = 0.07, but is nearly put over the theoreticcil one with Xj)/Xp = 10, although the theoretical curves by Heatley and Wood were calculMed for = 360 MHz. Shape of the temperature dependence curve of T" P seems to be scarcely affected by a difference of (Dj between 360 MHz and 400 MHz. Unfortunately, we could not compare our data of T in the compact form with the theoretical results by them, because they did not show the theoretical calculation of T of polystyrene. However, a larger xp/xp for the compact form may be reasonable than that for the coil form. 

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