Video Experimental Relacionado
Updated: Jul 20, 2026
11:19
Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
Published on: October 21, 2016
Las emisiones de monóxido de carbono de los automóviles se miden desde el interior de un automóvil que viaja
Science (New York, N.Y.)
|March 17, 1978
Resumen
El monitoreo del monóxido de carbono (CO) en los automóviles reveló aumentos significativos de CO de vehículos individuales. Una pequeña fracción de automóviles contribuye desproporcionadamente a las emisiones totales de CO2 de los vehículos, que varían en tres órdenes de magnitud.
Área de la Ciencia:
- Ciencias ambientales Ciencias ambientales.
- Química de la atmósfera La química de la atmósfera
- Ingeniería Automotriz Ingeniería Automotriz
Sus antecedentes:
- El monóxido de carbono (CO) es uno de los principales contaminantes atmosféricos de las emisiones de los vehículos.
- La medición precisa de CO de vehículos individuales es crucial para el control de emisiones.
Objetivo del estudio:
- Para cuantificar las emisiones de CO de los vehículos individuales que pasan.
- Para determinar la variabilidad de las emisiones de CO entre los vehículos.
- Evaluar la contribución de un pequeño número de vehículos de altas emisiones a la contaminación total de CO.
Principales métodos:
- Monitoreo en el vehículo de las concentraciones ambientales de CO.
- La medición de los aumentos de la concentración de CO atribuidos a los vehículos individuales que pasan.
- Análisis de la variabilidad de las emisiones en una gama de vehículos.
Principales resultados:
- Se detectaron aumentos medibles en la concentración de CO de vehículos individuales que pasaban.
- Las emisiones de CO variaron en tres órdenes de magnitud entre los vehículos.
- Un pequeño subconjunto de vehículos fue responsable de una gran proporción de las emisiones totales de CO2.
Conclusiones:
- Las emisiones de CO2 de los vehículos son muy variables.
- Dirigirse a los vehículos de altas emisiones puede reducir significativamente la contaminación general de CO.
- El monitoreo de emisiones en el mundo real proporciona datos valiosos para la gestión de emisiones.
Videos de Conceptos Relacionados
01:14The Carbon Cycle
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
03:09Measuring Reaction Rates
Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical field in...
01:19Turnover Number and Catalytic Efficiency
The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion. The...
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion. The...
01:19Gas Chromatography: Types of Detectors-II
In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
01:19Carbon Dioxide Transport in the Blood
Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
01:23Measurement of Air Content in Concrete
Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
The pressure method,...
The pressure method,...