scholarly journals Research on the Construction Technology of Tunnel Internal Air Circulation Purification under High-Quality Air Quality

2021 ◽  
Vol 692 (4) ◽  
pp. 042047
Author(s):  
Kun Li ◽  
Xianghong Ren
Keyword(s):  
Air Quality ◽  
Construction Technology ◽  
High Quality ◽  
Air Circulation

scholarly journals Urban Air Quality Modeling Using Low-Cost Sensor Network and Data Assimilation in the Aburrá Valley, Colombia

Atmosphere ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 91
Author(s):  
Santiago Lopez-Restrepo ◽  
Andres Yarce ◽  
Nicolás Pinel ◽  
O.L. Quintero ◽  
Arjo Segers ◽  
...  
Keyword(s):  
Air Quality ◽  
Data Assimilation ◽  
Transport Model ◽  
Cost Model ◽  
Low Cost ◽  
Model Performance ◽  
Monitoring Network ◽  
Correlation Factor ◽  
Chemical Transport Model ◽  
High Quality

The use of low air quality networks has been increasing in recent years to study urban pollution dynamics. Here we show the evaluation of the operational Aburrá Valley’s low-cost network against the official monitoring network. The results show that the PM2.5 low-cost measurements are very close to those observed by the official network. Additionally, the low-cost allows a higher spatial representation of the concentrations across the valley. We integrate low-cost observations with the chemical transport model Long Term Ozone Simulation-European Operational Smog (LOTOS-EUROS) using data assimilation. Two different configurations of the low-cost network were assimilated: using the whole low-cost network (255 sensors), and a high-quality selection using just the sensors with a correlation factor greater than 0.8 with respect to the official network (115 sensors). The official stations were also assimilated to compare the more dense low-cost network’s impact on the model performance. Both simulations assimilating the low-cost model outperform the model without assimilation and assimilating the official network. The capability to issue warnings for pollution events is also improved by assimilating the low-cost network with respect to the other simulations. Finally, the simulation using the high-quality configuration has lower error values than using the complete low-cost network, showing that it is essential to consider the quality and location and not just the total number of sensors. Our results suggest that with the current advance in low-cost sensors, it is possible to improve model performance with low-cost network data assimilation.

IAGOS Research Infrastructure for Global-Scale Atmosphere Monitoring by Instrumented Passenger Aircraft

2021 ◽  
Author(s):  
Andreas Petzold ◽  
Valerie Thouret ◽  
Christoph Gerbig ◽  
Andreas Zahn ◽  
Martin Gallagher ◽  
...  
Keyword(s):  
Climate Change ◽  
Air Quality ◽  
Relative Humidity ◽  
Water Vapour ◽  
Research Infrastructure ◽  
Good Resolution ◽  
European Research ◽  
Commercial Aircraft ◽  
High Quality

<p>IAGOS (www.iagos.org) is a European Research Infrastructure using commercial aircraft (Airbus A340, A330, and soon A350) for automatic and routine measurements of atmospheric composition including reactive gases (ozone, carbon monoxide, nitrogen oxides, volatile organic compounds), greenhouse gases (water vapour, carbon dioxide, methane), aerosols and cloud particles along with essential thermodynamic parameters. The main objective of IAGOS is to provide the most complete set of high-quality essential climate variables (ECV) covering several decades for the long-term monitoring of climate and air quality. The observations are stored in the IAGOS data centre along with added-value products to facilitate the scientific interpretation of the data. IAGOS began as two European projects, MOZAIC and CARIBIC, in the early 1990s. These projects demonstrated that commercial aircraft are ideal platforms for routine atmospheric measurements. IAGOS then evolved as a European Research Infrastructure offering a mature and sustainable organization for the benefits of the scientific community and for the operational services in charge of air quality and climate change issues such as the Copernicus Atmosphere Monitoring Services (CAMS) and the Copernicus Climate Change Service (C3S). IAGOS is also a contributing network of the World Meteorological Organization (WMO).</p> <p>IAGOS provides measurements of numerous chemical compounds which are recorded simultaneously in the critical region of the upper troposphere – lower stratosphere (UTLS) and geographical regions such as Africa and the mid-Pacific which are poorly sampled by other means. The data are used by hundreds of groups worldwide performing data analysis for climatology and trend studies, model evaluation, satellite validation and the study of detailed chemical and physical processes around the tropopause. IAGOS data also play an important role in the re-assessment of the climate impact of aviation.</p> <p>Most important in the context of weather-related research, IAGOS and its predecessor programmes provide long-term observations of water vapour and relative humidity with respect to ice in the UTLS as well as throughout the tropospheric column during climb-out and descending phases around airports, now for more than 25 years. The high quality and very good resolution of IAGOS observations of relative humidity over ice are used to better understand the role of water vapour and of ice-supersaturated air masses in the tropopause region and to improve their representation in numerical weather and climate forecasting models. Furthermore, CAMS is using the water vapour vertical profiles in near real time for the continuous validation of the CAMS atmospheric models. </p>

scholarly journals Construction Technology of Composite Cofferdam for Main Pier Bearing Platform of Dongjiang Lichuan Bridge

2020 ◽  
Vol 165 ◽  
pp. 04047
Author(s):  
Jianping Wang
Keyword(s):  
Steel Sheet ◽  
Economic Benefits ◽  
Construction Technology ◽  
High Quality ◽  
Rock Stratum ◽  
Advantages And Disadvantages ◽  
Construction Methods ◽  
Bored Pile ◽  
Geological Conditions ◽  
Pile Cap

Dongjiang Lichuan Bridge in Dongguan City is a curved tower curved beam cable-stayed bridge with a main span of 138m and no back cable. The main pier cap is located on the bank slope of Dongguan Waterway on one side of Nandi Road. The cushion cap is dumbbell type, and the left and right cushion caps are connected by tie beams. In most areas, the top of rock stratum is above the bottom of bearing platform. The rock stratum within the buried depth of bearing platform is moderately to strongly weathered argillaceous siltstone. The geological conditions are complex and the construction is difficult. In line with the principles of speeding up the construction process and improving economic benefits, comprehensive analysis and weighing advantages and disadvantages, the main pier cap adopts a composite cofferdam of filling soil to build an island and combining bored pile rows and steel sheet piles. The construction task of bearing platform of main pier has been completed with high quality. Compared with other cushion cap construction methods, this construction method has the advantages of fast construction, high quality, simple safety, energy saving and environmental protection. This paper briefly introduces the design scheme of composite cofferdam, expounds in detail the operation steps of steel sheet pile construction and the problems needing attention in construction, and provides good reference experience for similar pile cap construction.

scholarly journals PECULIARITIES OF AIR ENVIRONMENT FORMATION IN MODERN RESIDENTIAL BUILDINGS

2019 ◽  
pp. 50-53 ◽  
Author(s):  
E.V. Ivanova ◽  
O.L. Markova ◽  
M.N. Kir’yanova
Keyword(s):  
Air Quality ◽  
Large Scale ◽  
Window Glass ◽  
Residential Buildings ◽  
Ventilation System ◽  
Residential Construction ◽  
Quality Changes ◽  
High Quality ◽  
Exhaust Ventilation ◽  
Regulatory Documents

Air quality in residential premises equipped with modern airtight windows and entrance doors causes public complaints. We discussed peculiarities of air quality changes in residential buildings resulting from large-scale use of window glass units, which are characterized by increased thermal resistance and high-quality insulation, used in modern residential construction. Regulatory and law documentation are analyzed. Advisability of using mechanical supply and exhaust ventilation in residential premises, as well as special inlet devices – ventilation valves, which ensure sufficient air exchange in the apartment, unlike currently used exhaust ventilation system with natural inducement, are substantiated. It is suggested to coordinate the requirements of current sanitary standards and rules for residential premises with the requirements of engineering regulatory documents.

scholarly journals Analisis Kualitas Udara di Kamar Gelap yang Menggunakan Pengolahan Film Secara Manual dan Otomatis

2016 ◽  
Vol 2 (2) ◽  
pp. 167-171
Author(s):  
Ary Kurniawati ◽  
Dartini Dartini ◽  
Asri Indah Aryani
Keyword(s):  
Air Quality ◽  
Indoor Air ◽  
Measurement Data ◽  
Data Retrieval ◽  
Ambient Air ◽  
Ambient Air Quality ◽  
Air Quality Measurements ◽  
Periodic Maintenance ◽  
Air Circulation ◽  
Dark Room

Backgroun: Dark room is the room where the film is being processed as the final stage of the radiographic process, beside its function as a place of handling film and film storage. According to the MSDS, chemical liquid used in film processing can affect human health. It’s spill can cause irritation and burns on skin and eyes, irritation and injury to the digestive tract, while its  mist or dried residue can cause irritation of the respiratory tract. Good dark room air circulation is required.Methods: The study was observational study with measurement data retrieval techniques in the darkroom of four hospitals. The collected data then compared to the air quality requirement according Kepmenkes RI No.1204/Menkes/SK/X/2004 and No.1405/Menkes/SK/XI/2002.Result: The results showed that the physical air quality including temperature and humidity in the 1st, 2nd, 3rd and 4th darkroom was higher than the standards. The average air flow in the 1st, 2nd and 3rd  darkroom were up to standards, but there was no airflow in the 4th darkroom. Results of ambient air quality measurements  in the 1st, 2nd, 3rd and 4th including CO, NO2, SO2 and T.VOC did not meet the standards, while the presence of H2S and NH3 were not detected.Conclusion: Total dust levels in the 1st, 3rd and 4th  darkroom did not exceed the maximum concentration in indoor air ( 0.15 mg/m3), while the 2nd darkroom exceed the standard ( 0, 15 mg/m3). Using of air-conditioning and a dehumidifier with periodic maintenance is needed to resolve the discrepancy physical air quality, beside periodic cleaning and indoor air excahnge maintenance to resolve high levels of dust and gas pollutants.

scholarly journals Investigation of Air Circulation For Indoor Air Quality Of Middle-Class Apartment in Jakarta, Indonesia

2020 ◽  
Vol 1 (02) ◽  
pp. 16-21
Author(s):  
Dyah Nurwidyaningrum ◽  
Miftahul Ulum ◽  
Billy Septanto Syamsumarno
Keyword(s):  
Air Quality ◽  
Relative Humidity ◽  
Middle Class ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Quality Data ◽  
Circulation System ◽  
Air Movement ◽  
Quality Aspects ◽  
Air Circulation

The most significant energy used in middle-class apartments is the air circulation unit. The use of energy from the air circulation system is related to the comfort of the user in the housing unit, so it adjusts to the applicable standard. The objection of this study is to investigate the optimization of the air circulation system in middle-class apartments in an urban area. The method is a comparative study of the government standard. The stages of the research did site observation, take air quality measurement, and interview with the questionnaire. Indoor air quality data collected are temperature, relative humidity, CO, and CO2. The data measurement compared to SNI 03-6572-2001 on Procedures for Designing Air Conditioning and Ventilation Systems in Buildings, Indonesian National Standardization.  The questionnaire was to find out the comfort of residents on indoor air quality (IAQ). This study reveals that almost all air quality aspects are consistent to standard, except the temperature. The results of this study that meet the criteria related to air circulation are air movement 40%, relative humidity 65.5%, air movement 40%, CO 78%, and CO2 95%. The result of the questionnaires states that 72.4% of residents feel comfortable with the air quality in the dwelling unit. The size of the room and the adequacy of ventilation in the place influences the value of the air circulation system besides air movement.

Sign in / Sign up

Export Citation Format

Share Document