Model of the Morphology

One of the arguments used in the porous silicon literature to explain the typical dimension of the structures states that the pore formation is governed by the width of the space charge region formed near the semi-conductor/electrolyte junction (see, for example, [17]). The argument seems to be very plausible as it works well for the mesoporous structures (10-100 nm pore size) obtained from n-type Si. The model has also been proposed for porous SiC [18] and elaborated in Shishkin et al. [14], 

The width of the space charge (or, depletion) layer Lsc (cm) is determined by solving the Poisson equation with appropriate boundary conditions. For the case of an n-type semiconductor with a planar surface, such that n p Nj, and Nj Na, the charge density is approximated as p en. One obtains  

The gravimetric measurements for 4H n-type SiC show that y is very close to 7, within 1% accuracy [14]. 

The base of each triangle always lies in the basal plane whereas its sidewalls are oriented about 60° relative to the base. This pore shape implies some etching relationship to the crystallographic planes of the original SiC single crystal. 

Our SEM cross-sectional images show that the etching rate, defined as the thickness of a porous layer etched per unit time, is a factor of 

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The major respiratory factors in the control of ozone uptake are the morphology (including the mucus layer), the respiratory flow, the physical and chemical properties of mucus, and the physical and chemical properties of ozone. The next two sections discuss models of the morphology and the air and mucus flow. The physical and chemical properties of bronchial secretions have been reviewed by Barton and Lourenco and Charman et al. The relevant physical and chemical properties of ozone, are its solubility and diffusivity in mucus and water and its reaction-rate constants in water, mucus, and tissue. 

King R (1998) Mathematical modelling of the morphology of Streptomyces species. Adv Biochem Eng Biotechnol 60 95... 

Most models of the morphological changes in polymer blends assume that an average response e.g., an average size drop is being broken, or aver-... 

Myelinated auditory nerve neuron A detailed model of the morphology of myelination and ion channel distribution was formulated by Colombo and Parkins [ 1987] using the Frankenhaeuser Huxley model as a base it includes a fast sodium current, fast potassium current, a leakage current, and a slow sodium current. 

Docherty, R. and Roberts, K.J. (1988) Modelling of the morphology of molecular crystals anthracene, biphenyl and /7-succinic acid. Journal of Crystal Growth, 88, 159-168. 

B. Zanuttigh, Numerical modeling of the morphological response induced by low-crested structures in Lido di Dante, Italy, Coastal Eng. 54(1), 31-47 (2007). 

Figure 13 Model of the morphology of high-modulus PE fibers, (a) The two elements are the crystalline region Cj and the series combination of the crystalline region c with the amorphous region a. These two elements undergo the same strain, (b) The two elements are the crystalline region Cs in series with the parallel combination of the crystalline region Cn and the amorphous region a. These two elements carry the same stress, (c) Shift of the 1127-cm Raman band with strain for each of the two elements.

Estimates of interfacial thicknesses have been made by analysis of electron micrographs or by scanning analytical electron microscopy. X-Ray and neutron scattering methods have also been used but most extensively in the study of the interface in block copolymers. It is generally necessary to fit the scattering profile to a complete model of the morphology which contains a diffuse interface. 

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