Collapse

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Related to collapsing: fainting, collapsing pulse

collapse

[kə′laps]
(engineering)
Contraction of plastic container walls during cooling; produces permanent indentation.
(materials)
The flattening of cells in heartwood during drying or pressure treatment; often characterized by a caved-in or corrugated surface appearance.

Collapse

 

acute vascular insufficiency accompanied by a fall in arterial and venous blood pressure.

Collapse is a result of a disturbance of the regulation of vascular tonus and injury to the vascular walls through infection, intoxication, massive blood loss, severe dehydration, myocardial affection (acute myocardial infarction), and other pathological conditions. Collapse is characterized by a decrease of blood flow to the heart, a deterioration of the blood supply to the vital organs, and the development of hypoxia. The patient’s facial features become pinched and the eyes roll back. He becomes pallid, with sticky perspiration and cold extremities. If the patient is conscious, he lies immobile and indifferent to his surroundings. Breathing is superficial and accelerated. The pulse is rapid. The most accurate index of the gravity of the patient’s condition is the degree to which arterial pressure is lowered. Severe collapse may be a direct cause of death. Collapse is treated with the immediate use of agents that stimulate the vascular and respiratory centers and with vasoconstrictors, blood transfusions, and blood substitutes. Measures should also be directed toward the elimination of the primary causes of the collapse.

collapse

Mechanical failure of cells in wood, usually caused by abnormal or forced drying.
References in periodicals archive ?
Prices can vary from $75,000 to $130,000, depending on width and options such as type of collapsing hardware and additional cooling.
In this version, the tube of film passes through the collapsing frame and is drawn by the primary nip.
In a five-page internal document, Shapira and Saltmarsh report finding no correlation between neutrons with the energy expected from deuterium-deuterium fusion and light flashes from collapsing bubbles.
Measuring light emissions from a dense cloud of collapsing bubbles, Suslick's team found that the gas temperature gets as high as 5,100 kelvins.
Naval engineers have known since the late 1800s that bubbles forming and collapsing on propeller blades make noise and erode the blades.
Molecule formation releases energy, and the collapsing condensate would quickly heat up and blow apart, shooting atoms out of the magnetic trap.
At the same time, the new results suggest the possibility of using gas impurities for improved control of the characteristics of light emissions from collapsing bubbles.
The recent ocean discoveries come just as researchers are recognizing the importance of collapsing volcanoes on land.
And no one has caught a molecular cloud in the act of collapsing.
By measuring how long it takes light from these collapsing clouds to reach Earth, astronomers can figure out what galaxies looked like billions of years ago and deduce when galaxies started to form.
Yet despite their apparent simplicity, these equations describe gravity in a host of astrophysical systems, from exploding stars to collapsing galaxies.
Einstein's theory predicts that a collapsing star emits gravitational waves only if it is also rotating as it collapses.