Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Phase degree

Then it resides on the chiral circle with modulus p and phase , , any point on which is equivalent with each other in the chiral limit, mc = 0, and moved to another point by a chiral transformation. We conventionally choose a definite point, (vac p vac) = /,T (Jn the pion decay constant) and (vac Oi vac) = 0, for the vacuum, which is flavor singlet and parity eigenstate. In the following we shall see that the phase degree of freedom is related to spin polarization that is, the phase condensation with a non-vanishing value of Oi leads to FM [20]. [Pg.254]

It should be obvious that if A vanishes, the phase degree of freedom has to become redundant, as seen later. It would be worth mentioning that similar configuration has been studied in other contexts [21-23], Note that the configuration in (44) breaks rotational invariance as well as translational invariance, but the latter invariance is recovered by an isospin rotation [26]. [Pg.254]

The mass fraction of each phase that was obtained by the line shape analysis of the CH2 resonance line at different temperatures is summarized in Table 12 with Tic. It can be seen that the mass fraction of the crystalline phase (degree of crystallinity) stays unchanged at 0.57 over the wide temperature range from room temperature to 110 °C, while the amorphous phase increases and the interphase decreases with increasing temperature. The Tic of the CH2 carbon in each phase is mostly unchanged over the temperature range examined 65 70 s for the crystalline phase, 0.18 0.21 s for amorphous phase, and 7.0-7.5 s for the interphase. This shows that the molecular motion of each phase in the Tic time frame is almost the same either in the glassy or rubbery state. [Pg.89]

Metal content, wt.% Cu Zn Siq>port State Degree of Cu crystallinity,% 2 0 of Cu metal phase, degrees Domain size of Cu metal phase, nm... [Pg.412]

Liquid phase degrees) Derivatives separated References ... [Pg.142]

Besides the factors governing the choice of the catalyst that were discussed earlier, various other factors affect the reactivity of a PT catalyzed reaction. These include choice of organic solvent and anion, catalyst structural factors that determine the distribution of anion between the organic and aqueous phases, degree of hydration of anions, and so on (Landini et al., 1978 Herriot and Picker, 1975). These are reviewed in detail by Starks et al. (1994) and Dehmlow and Dehmlow (1993), and are only briefly discussed here. Since the PTC cycle is a multistep process, factors affecting each step and inter-relationships between steps are important. It is necessary to understand the factors that cause one anion to be taken into the organic phase hy more or less readily than a second anion. Also, once transferred, the anion should... [Pg.5]

W. H. Flank (Houdry Laboratories, Marcus Hook, Pa. 19061) In crystallizing a given zeolite from a 2-phase nutrient system, the composition in the liquid phase, especially the effective hydroxyl ion concentration, and the temperature must be controlled so that a balance is maintained between the ratio of the various silica and alumina species being obtained from dissolution of the solid phase and the ratio of these species already present in the liquid phase. Degree of supersaturation should also be controlled. Since the rate dependence of the various reaction steps is not constant for all species, lack of such control may have a severe effect on the system. What was done to the gel samples in Table VI, which had constant Si/Al and Na/Si ratios, to produce the various ratios noted for the liquid phase ... [Pg.49]

The simplest even-parity state is the isotropic state encountered in ordinary superconductors. This state is often referred to as s-wave state . The isotropic order parameter does not depend on the direction k and reduces to a complex constant cj) = Its only degree of freedom is the Josephson phase. By far the most extensively studied examples of anisotropic pairing are the p-wave states realized in the superfiuid phases of He, the d-wave pair state in high-Tc superconductors and the f-wave states in UPts and SrRu204. The odd parity (p, f) states among these examples are characterised by more than one order parameter component with internal phase degrees of freedom which appear in addition to the overall Josephson phase. [Pg.160]

The ratio of fuel and oxidizer is considered one of the most important parameters in determining the properties of synthesized powders obtained by combustion. Product properties such as crystallite size, surface area, morphology, phase, degree and nature of agglomeration, are generally controlled by adjusting the fuel-oxidant ratio. [Pg.17]

In practical applications of the above classical dynamics of electrons to the classical S-matrix theory, the choice of the initial phase degrees of freedom, qK is crucial for a path thus initiated to be able to reach the desired final condition on uk. In order to realize the special condition nK ti) = 6k,a and (tz) = k,i3, the electronic Hamiltonian of Eq. (4.50) has to be further converted to Langer-modified form. [Pg.78]

Figure 6.2.25 illustrates important measured and calculated parameters of the entrained flow gasifier like the temperature of the gas phase, degree of carbon conversion, and composition ofthe gas at different positions in the reactor. [Pg.552]

Fraction of total solute in a given phase degrees phase change flow resistance parameter... [Pg.1007]

Structural characteristics of the nano-particles such as morphology, shape, particle size, chemical state, t)q)e of crystal phases, degree of allo)dng, or distribution of surface metals, depend widely... [Pg.109]

DSC (differential scanning calorimetry) Heat capacity versus temperature or time allows measurement of heats of fusion, identification of crystalline and liquid crystalline phases, degrees of crystallinity, etc. Glass transition measurement allows characterisation of ageing, blend compatibilities. Heats of reaction allow cure and degradation studies. [Pg.179]

Transitions in two-component systems have one more degree of freedom, — i.e., one more variable of state must be specified. The additional variable is the concentration. The phase rule of Fig. 3.7 shows the relationship between number of phases, degrees of freedom and number of components. The equation can be verified using reasoning analogous to that for the one-component system. In this section the thermodynamics of the first-order transition in systems involving one pure and one mixed phase for small molecules will be treated. Other systems, especially those involving macromolecules, are treated in Chapters 4 and 5. Under certain conditions of temperature, pressure, and concentration, the transitions can be sharp and thermometry can yield useful information. [Pg.108]


See other pages where Phase degree is mentioned: [Pg.152]    [Pg.254]    [Pg.282]    [Pg.172]    [Pg.34]    [Pg.34]    [Pg.205]    [Pg.417]    [Pg.427]    [Pg.71]    [Pg.50]    [Pg.447]    [Pg.379]    [Pg.253]    [Pg.251]    [Pg.174]    [Pg.14]    [Pg.109]    [Pg.181]    [Pg.181]    [Pg.181]   
See also in sourсe #XX -- [ Pg.363 ]

See also in sourсe #XX -- [ Pg.183 ]




SEARCH



Degree of phase separation

Vapor-phase osmometry, degree

© 2024 chempedia.info