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The two distinct long lifetimes namely �3 and �4 are ascribable to ortho positronium annihilation in micro cavities within the molecular grains and inter granular mesoscopic pores respectively.
Discussion and Conclusion To handle a large number of experimental data, the most common trend has been to use TaoEldrup model [6] for small cavities based on spherical well potential with infinite walls and a virtual electron layer of fixed thickness somewhat empirically added to the inside of the cavity wall to make the possibility of overlap of the Ps wave function.

The film structure is quite b a c Title of Publication (to be inserted by the publisher) 663 regular in respect to the grain shape, size and height, suggesting a polymer deposition by a two dimensional growth.
Up to 75 mC cm-2 (figure 3b) the polymer thickening corresponds to an increase of the previously mentioned nodules, both in number and in size (diameter and height) as can be obtained by a detailed analysis of figure 3b.

Local defects in p-n junction may be associated with structural imperfections (such as grain boundaries, dislocations, and scratches), impurities, higher concentrations of donors and acceptors, or both.
The maximum of optically excited photocurrent is indicator of local conversion efficiency due to local light constant energy excitation, and number of imperfections is indicator of quality for solar cell lifetime.

Xu et al. explained that the increasing of conductivity is due to the reduction of the scattering of the carriers at the grain boundaries and crystal defects which leads to the increased of apparent carrier mobility [5].
Therefore, the electrical conductivity is correlated with the number of electron formed by ionization of the interstitial Zn atom and the oxygen vacancies which leads to the major impact of electrical conductivity of ZnO [12].

It is possible the laser alloying, densification, porosity removal, homogenization, fine-grained structure making, smoothing, hardening, tempering annealing, etc. [4-7].
On the specimens test surfaces number: 2, 4, 6 irrespective of option, were covered by corrosion directly after the treatment.

Table 2 The influence of aging time on relative crystallinity Column number Synthetic conditions Aging time[h] Crystallization temperature[℃] Crystallization time/[h] Relative crystallinity[%] 1 0 180 48 57.76 2 0 180 60 58.02 3 5 180 48 56.02 4 12 180 48 55.84 5 24 180 48 55.42 6 48 180 48 53.42 The influence of crystallization temperature on the Synthesis processCrystallization is divided into 2 periods: one is formation of the crystal nucleus, the other is crystal growth.
Grain size of ZSM-5 effect on C4 olefin catalytic cracking prepared propylene[J].

First, we casted Mg-3Zn, Mg-4Zn, Mg-5Zn (the number of Zinc in the front of Zinc as the percentage of the mass of Zinc in the alloy), then we cut the ingot into the samples of 20mm x 10mm by wire cutting.
When magnesium alloys are encountered in the non oxidizing corrosive medium with small ionic radii of active anions (such as Cl-, F-, and so on), the active anion can permeate through the dislocation and grain boundary from the defect of the membrane, selectively adsorbed on the passivation film, and the oxygen ions, hydroxyl ions and water on the original passivation film.

In contrast, the DCPD signal reflects an average position over the crack front which samples a number of grains and therefore is less affected by the local microstructure.

Especially around the grain boundaries the fine precipitates carbides of size 0.1 -0.3 µ are more in number in case of deep cryogenic treated specimen.

The resistance of a segmented thermistor depends on the number of segments (cells) and the cell dimensions.
SEM analysis of the obtained thick film thermistor with reduced dimensions showed a good quality dense surface with small grains (Fig. 2).