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.
Low-friction, segmented rollers can be substituted for hard maple slats in the collapsing frame to decrease friction.
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.
Molecule formation releases energy, and the collapsing condensate would quickly heat up and blow apart, shooting atoms out of the magnetic trap.
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.
At this stage in neutrino astronomy, however, such direct observations of supernovas are relatively rare and do little to help scientists calculate how often stars die by collapsing, an important part of understanding our galaxy's long-term evolution.
During a star's life, heat produced by thermonuclear fusion processes holds it up, preventing it from collapsing under its own gravity.