Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

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

457
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...
457
Precipitation Gravimetry01:03

Precipitation Gravimetry

6.6K
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...
6.6K
Responses to Drought and Flooding02:41

Responses to Drought and Flooding

10.7K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
10.7K
Types of Coprecipitation01:10

Types of Coprecipitation

634
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...
634
Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

89
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.
Other key practices include keeping masonry units...
89

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Evaluating the Impacts of Agriculture Conservation on Water Quantity and Quality Through Trend, Predictability, and Causality Analysis.

Water resources research·2026
Same author

Management of Hypertension and Associated Comorbidities: An Expert Consensus Statement from India.

The Journal of the Association of Physicians of India·2025
Same author

Optimizing the Diagnosis and Management of Nocturnal Hypertension: An Expert Consensus from India.

The Journal of the Association of Physicians of India·2025
Same author

Development of a composite drought indicator for operational drought monitoring in the MENA region.

Scientific reports·2024
Same author

Strain imaging as an early predictor in acute myocardial infarction - An augmented cross-sectional study.

Indian heart journal·2024
Same author

Remote sensing-based drought hazard monitoring and assessment in a coastal plain: A principal component approach.

Environmental research·2023
Same journal

A tri-axis optomechanical accelerometer with plasmonic MIM waveguide and structural direction-dependent optical signatures.

Scientific reports·2026
Same journal

Holographic leaky-wave antennas with independently controlled multiple counter-rotating vortex beams.

Scientific reports·2026
Same journal

Differential associations of longitudinal hearing and vision trajectories with dementia and mild cognitive impairment in older adults.

Scientific reports·2026
Same journal

Abdominal obesity and leisure-time sedentary behavior in relation to gastroesophageal reflux disease risk: a prospective cohort study from the UK Biobank.

Scientific reports·2026
Same journal

Effect of nitrogen-rich COF incorporation on the structure and separation performance of polyamide nanofiltration membranes.

Scientific reports·2026
Same journal

Withanolide A inhibits hIAPP aggregation: An In silico, biophysical, and drosophila-based In vivo validation.

Scientific reports·2026
查看所有相关文章

相关实验视频

Updated: Jul 10, 2025

In Situ Soil Moisture Sensors in Undisturbed Soils
08:20

In Situ Soil Moisture Sensors in Undisturbed Soils

Published on: November 18, 2022

6.3K

一个基于自动编码器的雪旱指数.

Sinan Rasiya Koya1, Kanak Kanti Kar1, Shivendra Srivastava1

  • 1Department of Civil and Environmental Engineering, University of Nebraska-Lincoln, Lincoln, USA.

Scientific reports
|November 24, 2023
PubMed
概括
此摘要是机器生成的。

我们开发了雪旱响应指数 (SnoDRI) 来检测和测量雪旱. 这个新指标使用机器学习来分析雪数据,改善依赖雪的地区的水资源管理.

更多相关视频

Author Spotlight: Advancing Alzheimer's Research – Exploring Early Detection and Multi-Omics Approaches
09:47

Author Spotlight: Advancing Alzheimer's Research – Exploring Early Detection and Multi-Omics Approaches

Published on: December 15, 2023

1.1K
Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands
00:09

Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands

Published on: August 29, 2019

13.6K

相关实验视频

Last Updated: Jul 10, 2025

In Situ Soil Moisture Sensors in Undisturbed Soils
08:20

In Situ Soil Moisture Sensors in Undisturbed Soils

Published on: November 18, 2022

6.3K
Author Spotlight: Advancing Alzheimer's Research – Exploring Early Detection and Multi-Omics Approaches
09:47

Author Spotlight: Advancing Alzheimer's Research – Exploring Early Detection and Multi-Omics Approaches

Published on: December 15, 2023

1.1K
Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands
00:09

Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands

Published on: August 29, 2019

13.6K

科学领域:

  • 水文和水资源水文与水资源
  • 气候科学 气候科学
  • 机器学习应用 机器学习应用

背景情况:

  • 融雪显著影响全球水文,影响地下水透和地表下水.
  • 雪地干旱是由于积雪减少造成的,对水源构成重大风险,特别是在像美国西部这样的地区.
  • 有效地检测雪旱的时间和严重程度对于水资源管理至关重要.

研究的目的:

  • 引入一个新的指标,即雪旱响应指数 (SnoDRI),用于识别和量化雪旱事件.
  • 为了评估SnoDRI的疗效,使用来自美国太平洋地区的历史数据.
  • 评估各种与雪有关的变量在雪干旱检测中的重要性.

主要方法:

  • 使用自我监督学习 (自动编码器) 和相互信息的组合开发了SnoDRI.
  • 在SnoDRI模型中,用于特征提取和变量重要性评估的运用随机森林.
  • 利用了NLDAS-2重复分析数据,涵盖1981-2021年美国太平洋地区的数据.

主要成果:

  • 在SnoDRI有效地识别和量化雪旱的发生.
  • 变量重要性分析揭示了导致雪旱检测的关键因素.
  • 该指数的解释表明,与历史上的雪旱事件有很强的巧合.

结论:

  • 斯诺德里 (SnoDRI) 提供了一种可靠的方法来监测雪旱状况.
  • 开发的指数可以增强雪占主导地位的盆地水资源管理策略.
  • 机器学习方法显示出对推动雪地水文研究的重大前景.