Dispersion inhomogeneous

F. L. Teixeira, W. C. Chew, M. Straka, M. L. Oristaglio, and T. Wang, Finite-difference time-domain simulation of ground penetrating radar on dispersive, inhomogeneous, and conductive soils, IEEE Trans. Geosci. Remote Sens., vol. 36, no. 6, pp. 1928—1937, Nov. 1998.doi 10.1109/36.729364... 

Polymer Precursor Process Possibility of preparing finer particles better reinforcement dispersion Inhomogeneous and phase-segregated materials due to agglomeration and dispersion of ultra-fine particles... 

As a summary of several studies for light elements in unevolved cluster stars (based on photometric or low dispersion spectroscopic indexes), the right panel of Fig. 1 nicely shows the main features. There are star-to star abundance variations, with large spreads in N anticorrelated with much smaller spreads in C (as found all the way from MS to RGB). The implications are that we are not looking simply at a conversion of C into N, and that primordial inhomogeneities... 

Although Ba and heavier elements seem to fit the solar r-process pattern, lighter elements show wide varieties [5]. In particular, a large dispersion has been found in [Sr/Ba] at low metallicity[l], suggesting that lighter elements such as Sr does not come from a universal process, which produces Ba and Eu, but from weak r-process. An inhomogeneous chemical evolution model suggests that the dispersions in [Sr/Ba] are well-explained, when weak r-process produces 60% of Sr but only 1% of Ba in metal-poor stars. Furthermore, intermediate mass elements such as Pd must provide clues to understand the weak r-process yield. 

When considering the composition inhomogeneity of Markovian copolymers, the finiteness of the chemical size of macromolecules cannot be ignored, because fractional composition distribution W(/ f) in the limit / -> oo turns out to be equal to the Dirac delta function 5(f - X). For macromolecules of finite size f2> 1 the function W(/ f) is the Gaussian distribution whose center and dispersion (Eq. 2) are described by relationships (Eq. 8) and the following one... 

The center and dispersion (Eq. 2) of the Gaussian distribution describing the composition inhomogeneity of a random copolymer comprising macromolecules whose length is 12> 1 have the very simple appearance... 

One of the prime objectives of the statistical chemistry of these polymers is establishing the dependence of their composition inhomogeneity on a macromolecule length l and on the reaction system parameters. A quantitative measure of this inhomogeneity is the dispersion (Eq. 2) of the composition distribution... 

Vertical dispersion cannot be described in such simple terms (Kaimal et al., 1976). First, varies throughout the planetary boundary layer. In the region, L < z < O.lzi, o- , z, and a- scales with w, only above O.lzi. For Zi = 1500 m and an effective stack height of 400 m, the dispersing plume is controlled by an inhomogeneous region that is almost half the effective stack height. 

When time-dependent signals are to be measured by a photomultiplier, the time sensitivity is usually limited by the inhomogeneous transit time. The transit time is the time taken by electrons generated in the cathode to arrive at the anode. If all of the emitted electrons had the same transit time, then the current induced in the anode would display the same time dependence as the incoming light, but delayed in time. However, not all of the electrons have the same transit time. This produces some uncertainty in the time taken by electrons to arrive at the anode. There are two main causes of this dispersion ... 

The resolution of an FPD is theoretically limited by the number of channels (512-2048). In practice, it is even less because the image suffers some broadening as it passes from the first MCP to the photodiode array (Fig. 4.63). Therefore, instruments with FPD can normally be switched from FPD to SEM detection, e.g., by vertical electrostatic deflection of the ion beam (Finnigan MAT900). Furthermore, quadrupole lenses or an inhomogeneous ESA behind the magnet are employed to achieve variable dispersion, i.e., to zoom the m/z range of simultaneous... 

E. F. Kuester and D. C. Chang, Propagation, attenuation and dispersion characteristics of inhomogeneous dielectric slab waveguides, IEEE Trans Microwave Theory Tech. 23, 98-106 (1975). 

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