Density profiles material

The scattering from an isolated sphere may be calculated from equation (B1.9.3 2). This derivation assumes that the sphere is iinifonn, with its density profile p(r) = Pq if r < rg and p(r) = 0 if r > Tq (surrounded by a non-scattering material). With this assumption, equation (BE9.32) becomes... 

Quality control tests are intended to detect produced materials which deviate from manufacturing specifications, and thus may result in questionable performance. The materials are usually subjected to spectrographic analysis which is the primary quality control check. The exposure tests are necessarily of short duration (hours or days), in which the test conditions attempt to reflect the environment of operation, for example using artificial seawater for a marine application. Since a property that is reproducible and indicative of a consistent quality anode is all that is required, there is no attempt to mirror, except in the crudest fashion, current density profiles. 

Considerable work in the area of general research on fuel cells, materials and components was reported by Australia, where the government-sponsored fuel cell R D program has made efficiency improvements in fuel cell electrodes by the formation of platinum nano-clusters in porous carbon by high density plasma sputter mechanisms. Initial experiments on the plasma sputter deposition of platinum onto a porous film has shown great promise and aggregates of platinum were detected in the film with a density profile which decreased away from the surface exposed to the plasma. 

Fig. 21. Density profiles from an over-driven simulation for a piston velocity of 3.75 km/s relative to unreacted material. The results shown were obtained by averaging over 0.02 ps intervals between 10 and 20 ps (solid line), 20 and 30 ps (dashed line), 30 eind 40 ps (dash-dotted line) and 40 and 50 ps (dotted line.)...

The rate of press closing, particularly under the high pressures that develop in the initial compression of the mat, has an important impact on the development of the density profile through the thickness of the panel. For a batch press the hydraulic pump capacity determines the closing rate. Increasing this rate reduces the quantity of material in which the resin has cured before the required face density has been achieved, and which must be removed in sanding. 

These processes provide a way of making produets over the whole range of densities. While MDF started its life as a panel eompeting with partieleboard as a wood substitute, it has become a new material in its own right. The ability to eontrol density profile so that the surface density of the sanded panel is uniform has... 

Figure 26. Density profile of an ideal (sharp interfaces) LSM as a function of depth. The (001) superlattice diffraction planes are centered in the layers of high-electron density material.

Figure 4. Density profiles for irradiated EPR samples. Solid line symbols are for 165 Mrad at 6.7 x 10 rad/h. Dotted line symbols are for 175 Mrad at 1.1 x 10 rad/h. The arrow indicates the density of unirradiated material, which gives a flat profile.

Figure 5. Density profile for an EPR cable Insulation material which had been stripped from the copper conductor and irradiated as a hollow tube. At low dose rate (1.6 x 10 rad/h) the material shows enhanced oxidation near the interior surface (solid line symbols). The dotted line symbols show the flat profile of unirradiated material.

Figure 2.24 C-V characteristic (a) and effective carrier density profile (b) of Ni/por-SiC/SiC structure. Reproduced from S. Soloviev etal., Materials Science Forum, 389-393, 1113-1116. Copyright (2002), with permission from Trans Tech Publications...

Despite the uniform fiber material, a certain density profile is created due to the action of... 

Liu YF, Nagle JF (2004) Diffuse scattering provides material parameters and electron density profiles of biomembranes. Phys Rev E 69(4) 040901... 

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