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Videos de Conceptos Relacionados

Global Climate Change01:50

Global Climate Change

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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Decreased Body Temperature01:29

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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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Frost Action on Concrete01:27

Frost Action on Concrete

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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.
This freeze-thaw cycle primarily causes surface scaling, where...
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Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

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In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...
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Cold Weather Concreting01:27

Cold Weather Concreting

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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.
To counteract the negative impacts of cold weather, ensuring...
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Frost Resistant Concrete01:29

Frost Resistant Concrete

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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.
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of...
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Updated: Jan 17, 2026

Laser-Induced Fluorescence Emission L.I.F.E. as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
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El 'último área de hielo' del Ártico está sobre hielo delgado

Rachel Berkowitz

    Science (New York, N.Y.)
    |January 15, 2026
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    Resumen

    Las Islas Reina Isabel de Canadá, un refugio vital de hielo marino, están mostrando signos de debilidad. Esta investigación pone de relieve los cambios en esta región ártica crítica.

    Área de la Ciencia:

    • Investigación en el Ártico
    • Ciencias del clima
    • La oceanografía

    Sus antecedentes:

    • Las Islas Reina Isabel son una región ártica crítica conocida por su hielo marino estable.
    • Comprender los cambios en esta región es crucial para el monitoreo climático global.

    Objetivo del estudio:

    • Para evaluar el estado actual del hielo marino en las Islas Reina Isabel.
    • Para identificar cualquier signo emergente de debilidad o cambio en este paraíso de hielo marino.

    Principales métodos:

    • Análisis de los datos de teledetección
    • Observaciones in situ del hielo
    • Encuestas expedicionarias en el Ártico canadiense

    Principales resultados:

    • Las observaciones indican una disminución en la resistencia del hielo marino.

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  • La evidencia sugiere una mayor vulnerabilidad a las tendencias de calentamiento.
  • Áreas específicas dentro del refugio muestran un notable adelgazamiento del hielo.

    • Conclusiones:

    • El paraíso de hielo marino en las Islas Reina Isabel está exhibiendo signos de estrés.
    • El seguimiento continuo es esencial para comprender las implicaciones a largo plazo de estos cambios.
    • Estos hallazgos subrayan la sensibilidad de los ecosistemas árticos al cambio climático.