Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

1.6K
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...
1.6K
Precipitation Processes01:12

Precipitation Processes

359
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...
359
Precipitation Gravimetry01:03

Precipitation Gravimetry

4.5K
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...
4.5K
Types of Coprecipitation01:10

Types of Coprecipitation

535
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...
535
What is Climate?01:16

What is Climate?

18.1K
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
18.1K
Global Climate Change01:50

Global Climate Change

24.0K
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.
24.0K

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Interpretable Machine Learning Approaches for Forecasting and Predicting Air Pollution: A Systematic Review.

Aerosol and air quality research·2026
Same author

Heatwaves and Mortality: The Influence of Choice of Definition and Lag.

GeoHealth·2026
Same author

Climate Change Perceptual Awareness, Climate-Related Anxiety, and Perceived Impacts of Climate Change Among University Students in Jordan: Findings from a Multi-University Cross-Sectional Study.

International journal of environmental research and public health·2026
Same author

Black carbon emissions in Jordan: national inventory, climate and health implications (2022-2050).

Environmental research communications·2026
Same author

Weaker and more frequent Mediterranean sea breezes in a warming climate.

Scientific reports·2026
Same author

Sustainability in Jordan's Municipal Solid Waste Management System: Reduction of Methane Emissions and Benefits to Public Health.

Research square·2026

関連する実験動画

Updated: May 22, 2025

A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data
10:46

A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data

Published on: December 9, 2015

10.6K

地中海の降雨は,高時間の変動が傾向ではない.

Sergio M Vicente-Serrano1,2, Yves Tramblay3, Fergus Reig4,5

  • 1Instituto Pirenaico de Ecología, Consejo Superior de Investigaciones Científicas (IPE-CSIC), Zaragoza, Spain. svicen@ipe.csic.es.

Nature
|March 13, 2025
PubMed
まとめ

地中海の降水量は,気候モデルの予測にもかかわらず,1871年から2020年まで安定しています. 観測された変動は主に自然の大気動態によるもので,長期的な傾向によるものではありません.

さらに関連する動画

Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data
09:55

Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data

Published on: December 12, 2013

8.6K
Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
10:28

Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information

Published on: June 13, 2020

5.7K

関連する実験動画

Last Updated: May 22, 2025

A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data
10:46

A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data

Published on: December 9, 2015

10.6K
Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data
09:55

Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data

Published on: December 12, 2013

8.6K
Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
10:28

Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information

Published on: June 13, 2020

5.7K

科学分野:

  • 気候科学
  • 環境科学
  • 水学

背景:

  • 気候モデルでは 地中海では 降水量が大幅に減少すると予測されています
  • 観察されたデータは最近の減少を示唆し,一部の研究はこれを人間の影響に起因している.
  • 地中海の長期の降水傾向と変動性については,対立する見解がある.

研究 の 目的:

  • 地中海地域における1871年から2020年までの降水量の変化を包括的に評価する.
  • 地中海の降水傾向に関する 矛盾する発見を調和させる.
  • 人為的な影響と対比する内部変動の役割を評価する.

主な方法:

  • この地域で最も広範な降雨データセット (27か国の23,000以上のステーション) を利用した.
  • 1871年から2020年までの降水データを分析した.
  • モデル相互比較プロジェクト第6段階 (CMIP6) のシミュレーションと比較した.

主要な成果:

  • 地中海の降水量は1871年から2020年までの間,ほとんど静止しています.
  • 多十年間および年間での有意な変動が観察されました.
  • 特定期間の傾向は,長期の気候変動ではなく,大気動態と内部変動に起因している.

結論:

  • 地中海地域の降水量は,いくつかの気候モデルの予測に反して,長期の静止状態を示しています.
  • 観測された降雨の変動は,主に自然の大気動力学によって引き起こされる.
  • 気候変動のホットスポットにおける環境,農業,水資源の計画には 決定的だ.