ablation

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Related to ablate: Ablative cooling

ablation

1. Medicine the surgical removal of an organ, structure, or part
2. Astronautics the melting or wearing away of an expendable part, such as the heat shield of a space re-entry vehicle on passing through the earth's atmosphere
3. Geology the wearing away of a rock or glacier

ablation

(ab-lay -shŏn) The loss of material from the surface of a moving body as a result of vaporization, friction, etc. For example, atmospheric atoms and molecules erode the surface of a meteoroid and damage the protective heat shield of a returning space shuttle.

Ablation

 

in glaciology, the wasting of the mass of a glacier or snow cover as a result of thawing, evaporation, or mechanical removal—for example, wind ablation or the falling of icebergs. It is caused chiefly by climatic factors.

Three types of ablation are distinguished according to place of appearance: subglacial (or bottom), internal, and surface. The internal heat of the earth, springs (particularly warm ones) surfacing in the glacier bed, and heat caused by the friction of the glacier in its bed are some of the causes of subglacial ablation. Internal ablation is caused by friction between the glacier components and by the circulation of water and air. The glacier surface receives warmth predominantly from solar radiation and from the air. The thermal balance of the glacier surface is the basis of all surface ablation processes. The term “ablation” is sometimes used as well as a synonym for “surface washoff.”

ablation

[ə′blā·shən]
(aerospace engineering)
The intentional removal of material from a nose cone or spacecraft during high-speed movement through a planetary atmosphere to provide thermal protection to the underlying structure.
(geology)
The wearing away of rocks, as by erosion or weathering.
(hydrology)
The reduction in volume of a glacier due to melting and evaporation.
(medicine)
The removal of tissue or a part of the body by surgery, such as by excision or amputation.
References in periodicals archive ?
The coating ablates at less than 1/10 the ablation rate of paints, according to the company.
Then, radiofrequency (high heat) or another type of energy, such as cryotherapy (freezing), is applied, which ablates or interrupts the electrical circuit and restores a normal rhythm.
It can laser ablate wire as fine as 52AWG in either a reel-to-reel or a pull-and-cut process.
The Hydro ThermAblator, an investigational device that circulates hot saline through the uterus to ablate the endometrium, is under review by the Food and Drug Administration for premarket approval.
Focal One fuses MR and 3D biopsy data with real-time ultrasound imaging, which allows urologists to view integrated, detailed 3D images of the prostate on a large monitor and direct high intensity ultrasound waves to ablate the targeted area.
With this clearance, FDA has now recognized the safety and effectiveness of the truFreeze system to ablate BE with LGD as well as high grade dysplasia and malignancies, thus providing physicians the ability to treat a variety of benign and malignant lesions in the esophagus with just one device.
In LIBS technique, a high energy beam from a Q- switched pulsed Nd: YAG laser is used to ablate the sample surface.
doctors to ablate atrial fibrillation (AFib) using a visually-guided laser balloon catheter.
At Mayo, we ablate only patients with a MACIS score of 6 or above and those with follicular cell--derived cancers.
Reader: I have had two catheter ablation attempts at excellent teaching hospitals, but I go into heart block each time they tried to ablate. I am very athletic and am now taking Sotalol.
ChemCam will ablate surface coatings from materials at standoff distances of up to 10 m and measure elemental composition of underlying rocks and soils.