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Related Concept Videos

Coronary Circulation01:21

Coronary Circulation

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The heart, an organ critical to survival, gets nourishment not from the blood it pumps but from a separate circulation system known as coronary circulation. This is the shortest circulation in the body and is responsible for supplying the heart with the nutrients it needs to function effectively.
Coronary circulation begins at the base of the aorta, where two main arteries arise—the left and right coronary arteries. These arteries encircle the heart in the coronary sulcus and supply the...
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Fetal Circulation01:14

Fetal Circulation

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Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
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Air-entraining Agents01:27

Air-entraining Agents

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Air-entraining agents improve the durability and workability of concrete in climates with frequent freezing and thawing. These agents prevent cracks by introducing small air bubbles into the mix, creating spaces accommodating water expansion when temperatures drop. The air-entraining agents lower the surface tension of water, forming stable, small air bubbles. This method is more effective than having accidental large voids, as the intentional, smaller, and evenly distributed air voids improve...
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Overview of Pulmonary Circulation01:19

Overview of Pulmonary Circulation

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The pulmonary circulation is a vital system in our body that acts as a bridge between the respiratory and cardiovascular systems. It serves as a transport network for deoxygenated blood from the heart to the lungs and then returns oxygen-rich blood back to the heart.
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Effects of Air-entrainment in Concrete01:28

Effects of Air-entrainment in Concrete

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Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
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Overview of Systemic and Pulmonary Circulation01:15

Overview of Systemic and Pulmonary Circulation

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The systemic and pulmonary circuits are crucial components of the circulatory system, working together to transport blood between the heart, lungs, and the rest of the body. The process begins with pulmonary circulation, where deoxygenated blood is pumped from the right ventricle to the lungs via the pulmonary trunk and arteries. Upon reaching the lungs, the blood becomes oxygenated and returns to the heart, specifically to the left atrium, via the pulmonary veins.
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Updated: Feb 3, 2026

Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry
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Cryogenic circulation for indoor air pollution control.

Ying Tang1, Lei Bi2, Robert J G Mortimer3

  • 1Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.

The Science of the Total Environment
|October 27, 2018
PubMed
Summary
This summary is machine-generated.

Cryogenic condensation effectively purifies indoor air by removing up to 99% of fine particulate matter (PM2.5) and 98% of nitrogen dioxide (NO2) through particle growth and gas condensation.

Keywords:
Air cleanerIndoor air qualityPM(2.5) pollutionPublic health

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Atmospheric Chemistry

Background:

  • Indoor air quality is significantly impacted by outdoor pollution, posing health risks.
  • Current air purification technologies have limitations including inefficiency and byproduct generation.

Purpose of the Study:

  • To investigate the efficacy and mechanism of cryogenic circulation for indoor air purification.
  • To explore a novel approach for continuous indoor air purification.

Main Methods:

  • Cryogenic circulation was employed to treat indoor air at sub-zero temperatures.
  • Particle size analysis was conducted to understand removal mechanisms.
  • Gaseous pollutants like nitrogen dioxide (NO2) were tested at various temperatures.

Main Results:

  • Up to 99% removal of indoor PM2.5 was achieved at -18°C via particle condensational growth.
  • 98% of NO2 was removed at -50°C through condensation.
  • The method shows potential for broad-spectrum indoor pollutant removal.

Conclusions:

  • Cryogenic condensation offers a promising, continuous method for indoor air purification.
  • This technique could be integrated into existing systems like air conditioners and humidifiers.
  • The approach is viable where health benefits justify energy consumption.