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Related Concept Videos

Precipitation Processes01:12

Precipitation Processes

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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Frost Action on Concrete01:27

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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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What is Weather?01:07

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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.
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Precipitation and Co-precipitation01:17

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Types of Coprecipitation01:10

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Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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Simulating Impacts of Ice Storms on Forest Ecosystems
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Weather features associated with aircraft icing conditions: a case study.

Sergio Fernández-González1, José Luis Sánchez1, Estíbaliz Gascón1

  • 1Atmospheric Physics Group, IMA, University of León, 24071 León, Spain.

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Summary
This summary is machine-generated.

Severe aircraft icing occurred due to local weather conditions, not just large-scale patterns. Topography played a key role in creating hazardous icing environments, even when broader forecasts showed no risk.

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Area of Science:

  • Atmospheric Science
  • Aviation Meteorology
  • Aerospace Engineering

Background:

  • Aircraft icing poses a significant aviation hazard, responsible for numerous accidents.
  • Understanding icing conditions is crucial for flight safety, especially in complex terrain.

Purpose of the Study:

  • To investigate the meteorological factors contributing to severe aircraft icing on a C-212-200 aircraft.
  • To analyze the role of local weather phenomena and topography in the formation of hazardous icing conditions.

Main Methods:

  • Continuous atmospheric profiling using a microwave radiometric profiler (MP-3000A).
  • Cloud hydrometeor analysis with a Cloud Aerosol and Precipitation Spectrometer (CAPS).
  • Ice nuclei concentration measurement and Weather Research and Forecasting (WRF) model simulations.

Main Results:

  • Topography generated mesoscale lows and gravity waves, leading to icing conditions.
  • Moisture, wind, temperature, stability, and shear were critical factors in icing.
  • Severe icing occurred locally despite a lack of synoptic-scale risk indicators.

Conclusions:

  • Local topographical effects can create significant aircraft icing risks.
  • Comprehensive analysis of mesoscale and microscale weather is essential for predicting icing.
  • This case highlights the potential for unexpected icing events in mountainous regions.