| 释义 |
pitting
pit 1 P0332500 (pĭt)n.1. A natural or artificial hole or cavity in the ground.2. a. An excavation for the removal of mineral deposits; a mine.b. The shaft of a mine.3. A concealed hole in the ground used as a trap; a pitfall.4. A small indentation in a surface: pits in a windshield.5. a. A natural hollow or depression in the body or an organ.b. A small indented scar left in the skin by smallpox or other eruptive disease; a pockmark.c. Zoology Either of a pair of depressions between the nostril and the eye of a pit viper that contain heat-sensing organs.d. Botany A cavity in the wall of a plant cell where there is no secondary wall, as in fibers, tracheids, and vessel elements.e. Informal An armpit.6. An enclosed, usually sunken area in which animals, such as dogs or gamecocks, are placed for fighting.7. a. The section directly in front of and below the stage of a theater, in which the musicians sit.b. Chiefly British The ground floor of a theater behind the stalls.8. a. The section of an exchange where trading in a specific commodity is carried on.b. The gambling area of a casino.9. a. A sunken area in a garage floor from which mechanics may work on cars.b. often pits Sports An area beside an auto racecourse where cars may be refueled or serviced during a race: pulled into the pits to have the tires rotated.10. a. Hell. Used with the.b. A miserable or depressing place or situation.c. pits Slang The worst. Used with the: "New York politics are the pits" (Washington Star).11. Football The middle areas of the defensive and offensive lines.v. pit·ted, pit·ting, pits v.tr.1. To mark with cavities, depressions, or scars: a surface pitted with craters.2. To set in direct opposition or competition: a war that pitted brother against brother.3. To place, bury, or store in a pit.v.intr.1. To become marked with pits.2. To retain an impression after being indented. Used of the skin.3. To stop at a refueling area during an auto race.
[Middle English, from Old English pytt, ultimately from Latin puteus, well; see pau- in Indo-European roots.]
pit 2 P0332500 (pĭt)n. The single central kernel or stone of certain fruits, such as a peach or cherry.tr.v. pit·ted, pit·ting, pits To extract the pit from (a fruit).
[Dutch, from Middle Dutch.]Thesaurus| Noun | 1. | pitting - the formation of small pits in a surface as a consequence of corrosionindentation, roughnesscorroding, corrosion, erosion - erosion by chemical action |
pitting
pitting[′pid·iŋ] (medicine) The formation of pits; in the fingernails, a consequence and sign of psoriasis. The preservation for a short time of indentations on the skin made by pressing with the finger; seen in pitting edema. (metallurgy) Selective localized formation of rounded cavities in a metal surface due to corrosion or to nonuniform electroplating. (mining engineering) The act of digging or sinking a pit. popping, blowing, pitting, popsShallow conical depressions, ranging in size from pinheads to diameters of ¼ in. (64 mm), just below the surface of a lime-putty finish coat; caused by the expansion of coarse particles of unhydrated lime or of foreign substances.
pitting1. The development of small cavities in a surface, owing to phenomena such as corrosion, cavitation, or (as in concrete) localized dis-integration. 2. In plastering, See popping. 3. The development of localized surface defects on a metal surface, e.g., small depressions, usually caused by electrochemical corrosion. 4. The localized corrosion in the form of cavities which takes place on the surface of a metal.compressor blade damage Various types of damages that compressor blades can sustain. Only one or two may take place simultaneously though these have been combined in this illustration.The various types of damages to compressor blades and their appearances are as follows:
i. Bend. The blade gives the appearance of ragged edges. Smooth repair of the edges or surface in question can be carried out, but the extent of the damage that can be repaired is limited.
ii. Bow. The main source of this type of damage is a foreign object. The blade is bent at the tips and the edges.
iii. Burning. The damage is caused by overheating. The surface of the blade is discolored. If the overheating is severe, there may be some flow of material as well.
iv. burr. A ragged or turn-out edge is indicative of this type of damage. This takes place during the grinding or cutting operation of the blade at the manufacturing stage.
v. corrosion. Oxidants and corrosive agents, especially moisture present in the atmosphere, are the main reasons for the corrosion or pitting of the blades. Normally, regular washing is sufficient to prevent it. The blade gives a pitted appearance, and there is some breakdown of the surface of the blade. Also called pitting.
vi. Cracks. Excessive stress from shocks, overloading, or faulty processing of blades during manufacturing can cause cracks and result in their fracture.
vii. Dent. These can be caused by FOD (foreign-object damage) or strikes by dull objects like those in bird strikes. Minor dents can be repaired.
viii. Gall. This type of damage is from the severe rubbing of blades, in which a transfer of metal from one surface to another takes place.
ix. Gouging. The blade gives the appearance of displacing material from its surface, and a tearing effect is prominently visible. This type of damage is from the presence of a comparatively large cutting material or foreign body between moving parts.
x. Growth. The damage manifests itself in the form of elongation of the blades. Growth type of damage takes place because of continued and/or excessive heat and centrifugal force.
xi. Score. Deep scratches are indicative of scoring, which is caused by the presence of chips between surfaces.
xii. Scratch. Narrow and shallow scratches are caused by sand or fine foreign particles as well as by mishandling the blades.
xiii. Pitting. Pitting takes place because of atmospheric corrosion, especially seawater. The surface of the blade shows signs of pitting.pitting
pitting [pit´ing] 1. the formation, usually by scarring, of a small depression.2. the removal from erythrocytes, by the spleen, of such structures as iron granules, without destruction of the cells.3. remaining indented for a few minutes after removal of firm finger pressure, distinguishing fluid edema (edema" >pitting edema) from myxedema" >myxedema. The amount of pitting serves as an assessment of severity and is graded on a numerical scale (see accompanying table).pit·ting (pit'ing), In dentistry, the formation of well defined, relatively deep depressions in a surface, usually used in describing defects in surfaces (often golds, solder joints, or amalgam). It may arise from a variety of causes, although the clinical occurrence is often associated with corrosion.
See also: pitting edema, nail pits. pit·ting (pit'ing) dentistry The formation of well-defined, relatively deep depressions in a surface, usually used in describing defects in surfaces (often gold, solder joints, or amalgam). It may arise from a variety of causes, although the clinical occurrence is often associated with corrosion.
See also: pitting edema, nail pitspit·ting (pit'ing) In dentistry, formation of well-defined, relatively deep depressions in a surface, usually used in describing defects in surfaces (often golds, solder joints, or amalgam). Patient discussion about pittingQ. What are the dentists going to do if I have Pit and fissure caries? I look at my teeth and i see tiny black stuff on the fissures of my molars. I am so freakin scared. Are the dentists going to do something painful?A. Well you will have to see a dentist if you want an answer on what kind of treatment they will offer you. Today dentists use good anesthesia so anything they will do is not supposed to be painful. Q. tender protuding lymph node lump rt. arm pit aprox. 1/2" dia. any concerns or recommend treatment necessary? A. lymph nodes can flare up any time you get infected in the armpit and all the area that it drains. i had it several times and it went away in the same manner that it came. i think that sometimes it caused because of a blockade done by deodorant. so i try to use this Chinese salt stone that doesn't contain aluminum. More discussions about pittingLegalSeePitFinancialSeepitpitting
Related to pitting: pitting edema, Crevice corrosion, pitting oedemaSynonyms for pittingnoun the formation of small pits in a surface as a consequence of corrosionSynonymsRelated Words- corroding
- corrosion
- erosion
|