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Precipitation Processes01:12

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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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Global Climate Change01:50

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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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Precipitation Gravimetry01:03

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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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Classification of Systems-II01:31

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Continuous-time systems have continuous input and output signals, with time measured continuously. These systems are generally defined by differential or algebraic equations. For instance, in an RC circuit, the relationship between input and output voltage is expressed through a differential equation derived from Ohm's law and the capacitor relation,
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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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Linearity is a system property characterized by a direct input-output relationship, combining homogeneity and additivity.
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Updated: Mar 22, 2026

Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon
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Global climatology of submesoscale restratification using machine learning.

Leyu Yao1, John R Taylor2

  • 1Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge, CB3 0WA, UK.

Scientific Reports
|March 21, 2026
PubMed
Summary

Submesoscale eddies significantly impact ocean stratification. A new machine learning method using Argo float data reveals global patterns of submesoscale restratification (SR), peaking in spring.

Keywords:
Argo floatProfile classification model (PCM)Submesoscale eddy

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Area of Science:

  • Oceanography
  • Physical Oceanography
  • Climate Science

Background:

  • Submesoscale eddies influence ocean surface mixed layer stratification and energy transfer.
  • Global-scale studies are limited by a lack of comprehensive, long-term observational data.

Purpose of the Study:

  • To develop the first global observational climatology of submesoscale restratification.
  • To utilize unsupervised machine learning for analyzing ocean density profiles.

Main Methods:

  • Applied an unsupervised machine learning method (profile classification model - PCM) to Argo float density profiles (2000-2021).
  • Classified vertical profiles based on ocean surface mixed layer density shape.
  • Defined the submesoscale restratification (SR) index as the fraction of profiles exhibiting submesoscale characteristics.

Main Results:

  • The SR index exhibits seasonal peaks in spring across both hemispheres.
  • SR index maxima lag mixed layer depth maxima by approximately one month.
  • Identified "hotspots" of high SR index in the Norwegian Sea and Drake Passage during spring.

Conclusions:

  • Submesoscale eddies play a crucial role in restratifying the ocean mixed layer.
  • The developed method enables global-scale analysis of submesoscale restratification patterns.
  • Findings advance understanding of ocean mixing and energy transfer processes.