Pitting definition

Increase in pit level. This is a definite signal of formation fluid invasion into the hole. The well must be closed as soon as ptossible. 

Pitting may be defined as a limiting case of localised attack in which only small areas of the metal surface are attacked whilst the remainder is largely unaffected, and this definition is applicable irrespective of the mechanism involved dezincification, crevice corrosion and impingement attack can all result in pitting, although the mechanisms of these three processes are quite different. 

Petroleum, natural gas, and synthetic fuels are excluded from the definition of a hazardous substance, and the definitions of pollutants and contaminants under CERCLA this is known as the Petroleum Exclusion. Although the EPA has the authority to regulate the release or threatened release of a hazardous substance, pollutant, or contaminant, the release of petroleum, natural gas, and synthetic fuels from active or abandoned pits or other land disposal units is currently exempt from CERCLA. Such sites cannot use Superfund dollars for cleanup, nor can the EPA enforce an oil and gas operator, landowner, or other individual to clean up a release under CERCLA. Substances exempt include such materials as brine, crude oil, and refined products (i.e., gasoline and diesel fuel) and fractions. 

Each molecular transformation applied by Leatherface is specified by a SMARTS definition followed by a series of instructions that specify how the substructure matched by the SMARTS is to be modified. The first example shows how neutral carboxylic acids are converted to their more physiologically relevant anionic forms. The Pit instruction indicates that a single proton is to be removed (—1) from the atom matching the third atom in the SMARTS. 

For each A we define k, as the maximal kinetic constant for reactions A Ay Ki = maxy fcyi. For correspondent j we use notation [Pg.130]

Definition 10.7 Suppose G is a group and V is a complex scalar product space. Then the triple G, V, p) is called a projective unitary representation if and only if p is a group homomorphism from G to PIT (V). 

Figure 42 Cyclic polarization curve for Type 302 stainless steel in 1,000 ppm NaCl. Note the definition of the breakdown and repassivation potentials, the vertex current density, and the appearance of metastable pits.

According to Danuta Czech s Auschwitz Chronicle, 1939-1945, incineration of exhumed bodies began on September 21,213 which seems quite credible, and ended in November. It is not known how these bodies were burned, but most definitely not in burning pits. Mass graves were almost certainly located to the southwest of the temporary earth basin , about 650 ft. west of what was to become Sector BUI of Birkenau, since the air photos from 1944 - specifically those from May 31 - show traces of four huge, parallel trenches in that area. (See the chapter by J. C. Ball, this volume.)... 

Any of the above types of etching can generally be used to satisfy (a) and (d) of Section 1.1 however, (b) and (c) of Section 1.1 require the use of a preferential or a nonpreferential etchant (i. e., etchants that produce definite types of pits). 

Pits of the nature described here are generally desirable in etching Intended to reveal dislocations, as mentioned in section 2.1 however, these pits faceted along definite crystallographic planes are the basis for orientation of crystals by optical techniques. The accuracy of optical techniques depends, in part, on the flatness of the facets. Wolff, Wilbur, and Clark (33) have listed the accuracy achieved for silicon and germanium. The accuracy obtained thus far for metals is not as good. 

In previous work (Chems and Jiao, 2001) dislocations with [0001]-line directions were aligned parallel to the electron beam, which is adequate to maximize the contribution of the line charge to the phase shift of the electron wave. However, the formation of pits at the intersection line of the dislocation with the surface due to ion etching of the sample is difficult to avoid and to detect. By analyzing embedded dislocations, thickness modifications, which also shift the phase with respect to the surrounding material according to Eq.(2), can be eliminated definitely. In addition, dynamical contributions to the phase shift are more difficult to exclude if... 

There is a difficulty with the definition of the fibre saturation point. Strictly it corresponds to the moisture eontent when the cell walls are fully saturated (which would occur where the relative humidity is 1.0) and all the lumens are free of water. However at high relative humidities, above about 0.98, the lumen tips and pits begin to fill by capillary condensation, eausing a sharp upward break in the sorption curve. In praetiee it is extremely hard to measure moisture content at these humidities and extrapolation from lower relative humidities is not particularly accurate. 

Most of the work done in the pteridine series has been concerned with the equilibria between the neutral species and the anions. This work was more fruitful than that involving the cations because all three of the values, piT/, pA /, and pK/ (for definitions, see Section II, A), could be determined, and, from these, ratios of the hydrated to the anhydrous forms were calculated. Furthermore, the kinetics in the... 

---