Global efforts for environmental cleanliness through the control of gaseous emissions from vehicles are gaining momentum and attracting increasing attention. Calibration plays a crucial role in these efforts by ensuri...Global efforts for environmental cleanliness through the control of gaseous emissions from vehicles are gaining momentum and attracting increasing attention. Calibration plays a crucial role in these efforts by ensuring the quantitative assessment of emissions for informed decisions on environmental treatments. This paper describes a method for the calibration of CO/CO<sub>2</sub> monitors used for periodic inspections of vehicles in cites. The calibration was performed in the selected ranges: 900 - 12,000 µmol/mol for CO and 2000 - 20,000 µmol/mol for CO<sub>2</sub>. The traceability of the measurement results to the SI units was ensured by using certified reference materials from CO/N<sub>2</sub> and CO<sub>2</sub>/N<sub>2</sub> primary gas mixtures. The method performance was evaluated by assessing its linearity, accuracy, precision, bias, and uncertainty of the calibration results. The calibration data exhibited a strong linear trend with R² values close to 1, indicating an excellent fit between the measured values and the calibration lines. Precision, expressed as relative standard deviation (%RSD), ranged from 0.48 to 4.56% for CO and from 0.97 to 3.53% for CO<sub>2</sub>, staying well below the 5% threshold for reporting results at a 95% confidence level. Accuracy measured as percent recovery, was consistently high (≥ 99.1%) for CO and ranged from 84.90% to 101.54% across the calibration range for CO<sub>2</sub>. In addition, the method exhibited minimal bias for both CO and CO<sub>2</sub> calibrations and thus provided a reliable and accurate approach for calibrating CO/CO<sub>2</sub> monitors used in vehicle inspections. Thus, it ensures the effectiveness of exhaust emission control for better environment.展开更多
Monumentenwacht(Monument Watch)is an organization that specializes in the periodic inspection of built heritage to raise awareness among owners and caretakers of the importance of proper maintenance and preventive con...Monumentenwacht(Monument Watch)is an organization that specializes in the periodic inspection of built heritage to raise awareness among owners and caretakers of the importance of proper maintenance and preventive conservation.It originated in the Netherlands in 1973.It was later established in Belgium,Germany,the UK,Denmark,Hungary,Italy,Slovak,Spain,France,and Portugal in the form of similar organizations and projects with similar aims.The organization promotes the idea of,fprevention is better than cureM by offering periodic inspection,monitoring,and minor urgent repair and writing independent professional inspection reports as a reference for owners and users for further maintenance and conservation activities.This study explores the working mode of Monumentenwacht in Flanders,Belgium,including its historical development,organizational structure,inspection team configuration,professional inspection report,database,reporting system,and technical manuals.A brief analysis of other similar organizations and projects in various European countries is included to reveal efficient ways to promote this model while respecting different cultural,economic,social,legal,and political contexts.展开更多
文摘Global efforts for environmental cleanliness through the control of gaseous emissions from vehicles are gaining momentum and attracting increasing attention. Calibration plays a crucial role in these efforts by ensuring the quantitative assessment of emissions for informed decisions on environmental treatments. This paper describes a method for the calibration of CO/CO<sub>2</sub> monitors used for periodic inspections of vehicles in cites. The calibration was performed in the selected ranges: 900 - 12,000 µmol/mol for CO and 2000 - 20,000 µmol/mol for CO<sub>2</sub>. The traceability of the measurement results to the SI units was ensured by using certified reference materials from CO/N<sub>2</sub> and CO<sub>2</sub>/N<sub>2</sub> primary gas mixtures. The method performance was evaluated by assessing its linearity, accuracy, precision, bias, and uncertainty of the calibration results. The calibration data exhibited a strong linear trend with R² values close to 1, indicating an excellent fit between the measured values and the calibration lines. Precision, expressed as relative standard deviation (%RSD), ranged from 0.48 to 4.56% for CO and from 0.97 to 3.53% for CO<sub>2</sub>, staying well below the 5% threshold for reporting results at a 95% confidence level. Accuracy measured as percent recovery, was consistently high (≥ 99.1%) for CO and ranged from 84.90% to 101.54% across the calibration range for CO<sub>2</sub>. In addition, the method exhibited minimal bias for both CO and CO<sub>2</sub> calibrations and thus provided a reliable and accurate approach for calibrating CO/CO<sub>2</sub> monitors used in vehicle inspections. Thus, it ensures the effectiveness of exhaust emission control for better environment.
基金This work was carried out within the scope of the research projects"Preventive conservation of immovable cultural heritage:the international theoretical evolution and successful practices"(2018-2019),funded by the State Administration of Cultural Heritage(SACH)in China"International Perspective of Preventive Conserva-tion"(2019-2020)in the Department of Architecture,Built Environment,and Construction Engineering of the Polytechnic University of Milan in Italy.
文摘Monumentenwacht(Monument Watch)is an organization that specializes in the periodic inspection of built heritage to raise awareness among owners and caretakers of the importance of proper maintenance and preventive conservation.It originated in the Netherlands in 1973.It was later established in Belgium,Germany,the UK,Denmark,Hungary,Italy,Slovak,Spain,France,and Portugal in the form of similar organizations and projects with similar aims.The organization promotes the idea of,fprevention is better than cureM by offering periodic inspection,monitoring,and minor urgent repair and writing independent professional inspection reports as a reference for owners and users for further maintenance and conservation activities.This study explores the working mode of Monumentenwacht in Flanders,Belgium,including its historical development,organizational structure,inspection team configuration,professional inspection report,database,reporting system,and technical manuals.A brief analysis of other similar organizations and projects in various European countries is included to reveal efficient ways to promote this model while respecting different cultural,economic,social,legal,and political contexts.
