Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Weighted Mean00:57

Weighted Mean

5.3K
While taking the arithmetic, geometric, or harmonic mean of a sample data set, equal importance is assigned to all the data points. However, all the values may not always be equally important in some data sets. An intrinsic bias might make it more important to give more weightage to specific values over others.
For example, consider the number of goals scored in the matches of a tournament. While computing the average number of goals scored in the tournament, it may be more important to...
5.3K
Mechanistic Models: Compartment Models in Individual and Population Analysis01:23

Mechanistic Models: Compartment Models in Individual and Population Analysis

83
Mechanistic models are utilized in individual analysis using single-source data, but imperfections arise due to data collection errors, preventing perfect prediction of observed data. The mathematical equation involves known values (Xi), observed concentrations (Ci), measurement errors (εi), model parameters (ϕj), and the related function (ƒi) for i number of values. Different least-squares metrics quantify differences between predicted and observed values. The ordinary least...
83
Testing Water Quality01:14

Testing Water Quality

172
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
172
Quality of Water01:19

Quality of Water

175
In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
175
Factors Affecting Solubility04:01

Factors Affecting Solubility

33.9K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.9K
Water: A Bronsted-Lowry Acid and Base02:30

Water: A Bronsted-Lowry Acid and Base

51.2K
The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:
51.2K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

The effect of endometriosis on fertility: Results of the National Health and Nutrition Examination and Mendelian randomization analysis, 1999 to 2006.

Medicine·2026
Same author

Perioperative real-time information sharing and its impact on family members' anxiety in patients undergoing elective thoracoscopic lobectomy: a single-center randomized controlled trial.

Perioperative medicine (London, England)·2025
Same author

Osteopontin mediated eosinophils activation by group II innate lymphoid cells.

The World Allergy Organization journal·2022
Same author

More Jump More Health: Vertical Jumping Learning of Chinese Children and Health Promotion.

Frontiers in psychiatry·2022
Same author

The Effect of IL-35 on the Expression of Nasal Epithelial-Derived Proinflammatory Cytokines.

Mediators of inflammation·2021
Same author

Male Syrian Hamsters Experimentally Infected with Helicobacter spp. of the H. bilis Cluster Develop MALT-Associated Gastrointestinal Lymphomas.

Helicobacter·2015

Related Experiment Video

Updated: Sep 2, 2025

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
12:50

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

Published on: September 26, 2017

11.3K

The improved entropy weighting model in water quality evaluation based on the compound function.

Luo Xi1,2,3, Zeng Qin1,2,3, Yan Feng4,5

  • 1College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China.

Environmental Monitoring and Assessment
|August 10, 2022
PubMed
Summary
This summary is machine-generated.

An improved Entropy Weight Model (EWM) better evaluates water quality by considering pollution levels alongside dispersion. This method highlights heavily polluted indicators, providing a more accurate assessment of water bodies like Poyang Lake.

Keywords:
Compound functionDispersion degreeEntropy weight modelPollution degreePoyang LakeWater quality evaluation

More Related Videos

Watershed Planning within a Quantitative Scenario Analysis Framework
12:44

Watershed Planning within a Quantitative Scenario Analysis Framework

Published on: July 24, 2016

8.1K
Optimization of Processing of Tiebangchui with Highland Barley Wine Based on the Box-Behnken Design Combined with the Entropy Method
09:12

Optimization of Processing of Tiebangchui with Highland Barley Wine Based on the Box-Behnken Design Combined with the Entropy Method

Published on: May 19, 2023

717

Related Experiment Videos

Last Updated: Sep 2, 2025

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
12:50

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

Published on: September 26, 2017

11.3K
Watershed Planning within a Quantitative Scenario Analysis Framework
12:44

Watershed Planning within a Quantitative Scenario Analysis Framework

Published on: July 24, 2016

8.1K
Optimization of Processing of Tiebangchui with Highland Barley Wine Based on the Box-Behnken Design Combined with the Entropy Method
09:12

Optimization of Processing of Tiebangchui with Highland Barley Wine Based on the Box-Behnken Design Combined with the Entropy Method

Published on: May 19, 2023

717

Area of Science:

  • Environmental Science
  • Water Quality Assessment
  • Ecological Monitoring

Background:

  • The conventional Entropy Weight Model (EWM) for water quality evaluation often overlooks heavily polluted indicators due to its reliance on dispersion degree alone.
  • This limitation can lead to an incomplete understanding of water body health and ecological threats.

Purpose of the Study:

  • To develop and apply an improved Entropy Weight Model (EWM) that incorporates both indicator dispersion and pollution degrees for more accurate water quality assessment.
  • To evaluate the water quality of Wucheng Wetland in Poyang Lake, China, using the enhanced EWM and identify key pollutants.

Main Methods:

  • An improved EWM was designed, where indicator weights are a compound function of dispersion and pollution degrees, adjusting dynamically between clean and polluted domains.
  • The improved EWM was applied to analyze water samples from Wucheng Wetland, Poyang Lake, focusing on indicators like Total Phosphorus (TP), Permanganate Index (CODMn), and Ammonia Nitrogen (NH3-N).
  • Dispersion and pollution degrees were calculated for key indicators, and their weights were determined using the improved EWM.

Main Results:

  • The improved EWM assigned higher weights to indicators with greater pollution degrees, such as TP (weight 0.613, pollution degree 0.971), compared to less polluted but more dispersed indicators.
  • Comprehensive water quality indices for Wucheng Wetland's estuary, wetland, and central lake areas were all rated as "bad" (32.5, 30.9, and 35.6, respectively).
  • The study identified phosphorus as a major pollutant, indicating a high threat to the wetland's ecosystem.

Conclusions:

  • The improved EWM provides a more rigorous and reasonable water quality evaluation by effectively highlighting the significance of heavily polluted indicators.
  • The water environment in Wucheng Wetland is severely impacted, particularly by phosphorus pollution, posing a significant ecological risk.
  • This enhanced weighting approach is crucial for accurate ecological monitoring and effective water resource management.