scratch


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Related to scratch: Scratch games

scratch

1. Billiards snooker
a. a shot that results in a penalty, as when the cue ball enters the pocket
b. a lucky shot
2. poultry food

scratch

[skrach]
(computer science)
To remove data or to set up its identifying labels so that new data can be written over it.

scratch

To score or groove a plaster surface to provide a better bond for the succeeding coat.

compressor blade damage

compressor blade damageclick for a larger image
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.

scratch

(1)
(From "scratchpad") Describes a data structure or recording medium attached to a machine for testing or temporary-use purposes; one that can be scribbled on without loss. Usually in the combining forms "scratch memory", "scratch register", "scratch disk", "scratch tape", "scratch volume".

See also scratch monkey.

scratch

(2)
(primarily IBM) To delete (as in a file).

Scratch

A visual programming language for creating animations, developed at MIT and introduced in 2007. A Scratch script is coded by dragging predefined action commands into a work area. Used in schools, colleges and community centers to create games, animations and infographics, Scratch is also used to teach basic programming concepts. See scratch disk.


Scratch Motion Commands
After dragging "Move 10 Steps" to the work area and changing 10 to 25, clicking the command moves the cat "costume" 25 steps across the stage. Users can create their own costumes, but Scratch comes with hundreds to choose from.
References in periodicals archive ?
Following the ASTM/ISO standards for the scratch test of polymeric materials [37, 38], a series of scratch tests with the scratch velocity of 100 mm/s were performed for PP using a home-made scratch machine referring to the literature [39].
Irving, Texas-based Cheddar's Scratch Kitchen was founded in 1979 by Aubrey Good and Doug Rogers, who believed that when a meal is prepared from scratch just for the guest, it not only tastes better, but it makes the guest feel good.
A recent standardized test method (ASTM D7027: Standard Test Method for Evaluation of Scratch Resistance of Polymeric Coatings and Plastics Using an Instrumented Scratch Machine) has been used by several authors to evaluate the scratch resistance of coatings on glass (36,44) and metal (34,35) substrates.
The unparalleled colour space of the Sony F65 and PMW-F55 CineAlta digital cameras, coupled with Scratch Lab allows for much more creative freedom than was previously available in the production and post-production processes," stated Shuji Okada, General Manager -- Marketing, Sony Professional Solutions MEA FZ LLC.
Better yet, most Scratch projects made by others have a handy 'See Inside' button, which lets you poke around at the code that made them.
There are several mar and scratch tests, some of which, as noted previously, are abrasion tests.
Teesside took the scratch section 7-5 but the Eden boys came back strongly to win the handicap 8-4.
When you launch Scratch, you'll see a screen with the Scratch cat on the right (this is called a "Sprite") and the programming palette on the left.
Users create projects using downloaded software, then upload their projects to the Scratch web site for sharing.
A Scratch program involves three major components, Stage, Sprite, and Script, and developing a Scratch program is conceptually similar to directing a show as an executive producer.
Abstract A new approach for evaluating the wet-adhesive strength of epoxy-based coatings was carried out based on a recently standardized ASTM/ISO scratch test.
Written by Vicki Fischer and illustrated by Martha Day Zschock, for rock 'n' roll enthusiasts from 6 to 60, "Rock Star Scratch & Sketch" is an art activity book that explores the very special world of rock music by sketching the pictures, and scratching away the black coating to reveal colorful glitter and swirl patterns emerge.