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Related Concept Videos

Precipitation Gravimetry01:03

Precipitation Gravimetry

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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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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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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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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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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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Gravimetry: Overview01:05

Gravimetry: Overview

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Gravimetric analysis is a quantitative method where the analyte is isolated and weighed directly or after conversion into a substance of known composition. Gravimetric analysis can be classified as precipitation, electrogravimetry, volatilization, and particulate gravimetry, based on the method used to isolate the analyte.
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Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
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Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt

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Monitoring storm evolution using a high-density seismic network.

J Diaz1, M Ruiz2, M Udina3

  • 1Geosciences Barcelona - CSIC, Barcelona, Spain. jdiaz@geo3bcn.csic.es.

Scientific Reports
|February 1, 2023
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Summary
This summary is machine-generated.

Seismic network data reveals rainfall patterns with high spatial resolution. Seismic noise amplitude above 40 Hz serves as a rainfall proxy, complementing radar and rain gauge data.

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Area of Science:

  • Geophysics
  • Meteorology
  • Environmental Science

Background:

  • Dense seismic networks can capture subtle ground vibrations.
  • Understanding rainfall's seismic signature is crucial for environmental monitoring.
  • Existing methods for rainfall measurement have limitations in certain topographies.

Purpose of the Study:

  • To investigate the use of seismic data as a proxy for rainfall.
  • To determine the spatial and temporal evolution of rainfall using seismic noise.
  • To assess the added value of seismic data compared to traditional meteorological tools.

Main Methods:

  • Deployment of a dense seismic network in the Cerdanya basin.
  • Analysis of seismic data frequencies above 40 Hz to identify rainfall noise.
  • Comparison of seismic data with high-resolution disdrometer, radar, and rain gauge data.

Main Results:

  • Seismic noise amplitude above 40 Hz strongly correlates with rainfall intensity.
  • Seismic data provides high spatial resolution (1.5 km interstation distance) of rainfall evolution.
  • Seismic data complements radar data, especially in areas with complex topography.
  • Thunderstorms can be detected via seismic recording of thunder's sonic waves.

Conclusions:

  • Seismic data offers a valuable, high-resolution tool for monitoring ground-level rainfall.
  • This method enhances our understanding of precipitation dynamics, particularly in challenging terrains.
  • Seismic data can also aid in studying atmospheric variations during thunderstorms.