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Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the concrete.
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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Concrete's susceptibility to frost damage during freeze-thaw cycles demands strategic measures to enhance its frost resistance. Employing techniques like air entrainment, adjusting the water-cement ratio, proper curing, and selecting appropriate aggregates are essential.
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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
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Boiling Point Elevation
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Freezing Human ES Cells
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Geladas.

Vivek V Venkataraman1, Addisu Mekonnen1

  • 1Department of Anthropology and Archaeology, University of Calgary, Calgary, Alberta, Canada.

Current Biology : CB
|May 23, 2023
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Summary
This summary is machine-generated.

Gelada monkeys, a unique primate species, are introduced in this work. Learn about their distinct characteristics and ecological roles.

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Area of Science:

  • Primatology
  • Ethology
  • Zoology

Background:

  • Gelada monkeys (Theropithecus gelada) are endemic to the Ethiopian Highlands.
  • They represent a unique evolutionary lineage within the Old World monkeys.

Purpose of the Study:

  • To provide an introduction to the biology and behavior of gelada monkeys.
  • To highlight their ecological significance and conservation status.

Main Methods:

  • Observational studies in natural habitats.
  • Review of existing literature on gelada monkey behavior and ecology.

Main Results:

  • Geladas exhibit complex social structures and unique foraging strategies.
  • Their diet primarily consists of grasses and herbs, differentiating them from other primates.

Conclusions:

  • Gelada monkeys are a key species in their ecosystem.
  • Further research and conservation efforts are crucial for their long-term survival.