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Updated: Jul 10, 2025

Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands
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基于VDD的不同分解方法进行降雨预测的比较研究

Xianqi Zhang1,2,3, Qiuwen Yin4, Fang Liu1

  • 1Water Conservancy College, North China University of Water Resources and Electric Power, Zhengzhou, 450046, China.

Scientific reports
|November 18, 2023
PubMed
概括

准确的降雨预测使用了一种新的VMD分解方法,与优化的神经网络相结合. 这种方法显著提高了预测准确度,有助于水资源管理和预防灾害.

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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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Precipitation Gravimetry

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.
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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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Survival trees are a non-parametric method used in survival analysis to model the relationship between a set of covariates and the time until an event of interest occurs, often referred to as the "time-to-event" or "survival time." This method is particularly useful when dealing with censored data, where the event has not occurred for some individuals by the end of the study period, or when the exact time of the event is unknown.
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