Crevice minimizing

Under these circumstances, appropriate water management objectives should probably include a requirement to take all measures to prevent or minimize localized corrosion processes occurring that could cause pitting, crevice attack, tuberculation, etc. This will undoubtedly require close attention to maintaining clean waterside metal surfaces, but may also require more tolerance of an acceptable rate of general corrosion, to, say, 4 mpy, or a little higher. 

Many models exist to predict the conditions within these sites (e.g., 34,35). However, if the primary need is to determine the extent of corrosion damage (e.g., the depth of corrosion penetration), these models are not sufficient. Generally, electrochemical techniques contain no spatial information, since the current measured is the sum of currents from all individual corrosion sites. In the case of pitting, this limitation is being slowly erased as scanning techniques capable of spatial resolution are being developed. However, the ability to resolve local corrosion sites within fixed occluded areas such as cracks and crevices remains minimal. 

Hydrogen permeation testing was conducted using the permeation test rig shown in Figure 2. Samples, 19 mm diameter and 0.89 mm thick or disks were welded into 2.12" diameter Conflat (CF) flanges. Crevices were seal welded using electron beam welding to minimize the effects of virtual leaks. The... 

Indoors— Most indoor insect control is aimed at prevention or eradication of the pest problem while minimizing the exposure of humans and animals to chemicals. The most common application techniques are crack and crevice treatments, spot treatments, and fumigation of entire structures, commodities, or individual pieces of equipment. 

The main approach to improving the pitting and crevice corrosion resistance of the basic 35% nickel, 19% chromium, and 2% molybdenum alloy was to increase the molybdenum content. Among the first of the newer alloys introduced was 904 L (UNS N08904), which boosted the molybdenum content to 4% and reduced the nickel content to 25%. The reduction in nickel content was beneficial as a costsaving factor, with minimal loss of general corrosion resistance and sufficient resistance to chloride SCC. 

A number of devices aid in the removal of plaque from surfaces between teeth, around bridgework, and in other areas that are difficult to reach. The limitation of many of these devices is that they are effective for control of supragingival plaque but, at best, can remove subgingival plaque only to a depth of few millimeters. Therefore, they are of minimal value against subgingival plaque located deeper within the gingival crevice, as is the case in periodontal disease. 

The second type of a-helix/p-sheet domain consists of an open p-sheet which is twisted. The structure of the P-sheet resembles the helicoid, as shown in Fig. 6.4. Here again then the curvature of this surface also corresponds to that of a minimal - or closely related hyperbolic - surface. As the P-sheet is open it can consist of different numbers of P-chains four to ten have been observed(l]. The active site is also in this case at the carboxyl end region, and it is located in a crevice formed when loops from the P-chain to the a-helix have opposite directions (between a set of a-helices on one side of the P-sheet and a set on the other side). 

Clean design Care should be taken in the design of both the dryer and dryer ancillary (cyclones, filters, etc.) equipment to eliminate ledges, crevices, and other obstructions which can lead to dust and product buildup. Smooth drying equipment walls will minimize deposits. This can go a long way in prevention. No system is perfect, of course, and a routine cleaning schedule is also recommended. 

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