Mound growth development

Figure 12. Initial development of particulates between the mound growths. Methane exposure 406 torr h at 800°C.

The Development of Mound Growths. The mound carbon encapsulates the metal and prevents it from taking part in the reaction until particulate growth has caused substantial break-up of the bulk metal. Similar types of deposit have been reported in the Ni/C2H2 reaction at 990°C and Fe/CIfy system at 1100°C(19). A reduction in reactivity caused by encapsulation was reported for the Fe/CjHg deposition reaction(20)... 

The results of this in-situ SEM work suggest that solution-precipitation processes have some part in the development of four of the morphological types discussed, i.e. continuous laminar carbon films, mound growths, and two types of particulate material Although a small amount of filamentary carbon was observed, it does not appear to be a major characteristic of the Fe-CH4 reaction. 

In order to ensure that the visual assessment captures all irritant responses, it may be necessary to record more than one assessment for any given skin site. This is particularly true for use tests, where topical application is likely to cover a large area of skin. The area of application may need to be divided into several discrete sites, which are assessed separately. For example, the axilla may be split into three sites the peak (generally identified as the mounded area in the centre of the axilla, where the majority of hair growth occurs), the around (skin around the peak which usually receives some treatment) and the creases (creases that are found crossing through the axilla). Treatment may be discontinued due to a reaction (e.g. well-developed erythema) in any of the three sites. 

Tree declines stunted pale leaves no new growth. Cause Root rot. Root rot can be caused by overwatering or by poorly drained soil, but the disease may take years to develop. There is no cure. Replant in well-drained soil or on a raised mound of soil. Grande and Martin are rootstocks resistant to this problem. 

Particulate Development Crystalline Particles. Particulate material is first detected in areas between the carbon mounds after lateral growth of the mounds has ceased, Figure 9b. Two types of particulate eventually develop, viz... 

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