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相关概念视频

Precipitation Gravimetry01:03

Precipitation Gravimetry

6.1K
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...
6.1K
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

1.8K
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...
1.8K
Precipitation Processes01:12

Precipitation Processes

442
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...
442
Precipitation Titration Curve: Analysis01:21

Precipitation Titration Curve: Analysis

1.1K
The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
1.1K
Light Acquisition02:16

Light Acquisition

8.4K
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
8.4K
Types of Coprecipitation01:10

Types of Coprecipitation

603
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.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
603

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相关实验视频

Updated: Jun 24, 2025

Identification of Novel Regulators of Plant Transpiration by Large-Scale Thermal Imaging Screening in Helianthus Annuus
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Identification of Novel Regulators of Plant Transpiration by Large-Scale Thermal Imaging Screening in Helianthus Annuus

Published on: January 30, 2020

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一个协调的全球网格化透气产品,基于同位分析的同位分析.

Changming Li1, Juntai Han1, Ziwei Liu1

  • 1State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, 100084, China.

Scientific data
|June 7, 2024
PubMed
概括
此摘要是机器生成的。

一种新方法通过计算错误交叉相关性来改善全球透气数据集. 这导致了更可靠的长期数据集,这对于了解水循环动态至关重要.

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A Telemetric, Gravimetric Platform for Real-Time Physiological Phenotyping of Plant–Environment Interactions
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Early Detection of Cyanobacterial Blooms and Associated Cyanotoxins using Fast Detection Strategy
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Early Detection of Cyanobacterial Blooms and Associated Cyanotoxins using Fast Detection Strategy

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相关实验视频

Last Updated: Jun 24, 2025

Identification of Novel Regulators of Plant Transpiration by Large-Scale Thermal Imaging Screening in Helianthus Annuus
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A Telemetric, Gravimetric Platform for Real-Time Physiological Phenotyping of Plant–Environment Interactions
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科学领域:

  • 地球系统科学 地球系统科学
  • 水文学的水文学
  • 遥感 遥感 遥感 遥感

背景情况:

  • 透气是全球水循环的关键组成部分,受到环境因素和人类活动的影响.
  • 准确的全球透气数据集对于气候建模和水资源管理至关重要.
  • 目前用于评估透气产品错误的现有方法往往忽略了错误交叉相关性,限制了它们的可靠性.

研究的目的:

  • 通过将错误交叉相关性纳入拼接分析来开发更可靠的全球透气数据集.
  • 改进水文变量多源数据的融合技术.
  • 为科学研究提供长期,高分辨率的全球透气数据集.

主要方法:

  • 采用了考虑非零误差交叉相关性 (ECC) 的同位分析来评估多个透气产品中的错误.
  • 合并多个透气产品,使用改进的聚合分析来创建一个统一的数据集.
  • 将合并的数据集与现场观测数据进行验证,并将FLUXNET站点的透气数据分为不同的植被类型.

主要成果:

  • 开发了一个长期 (2000-2020) 每日全球透气数据集,分辨率为0.1°.
  • 与单个输入产品相比,合并的数据集显示出更高的可靠性.
  • 考虑到ECC的增强方法,大大提高了透气数据的准确性和可靠性.

结论:

  • 将错误交叉相关性纳入拼接分析是创建可靠水文数据集的重大进步.
  • 新的全球透气数据集提供了更高的准确性,并在各种生态系统中得到验证.
  • 这项工作为了解气候变化中的透气动态提供了宝贵的资源.