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Journal articles on the topic 'Airborne ceiling'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Lietzén, Jesse, Ville Kovalainen, Lauri Talus, Mikko Kylliäinen, Aitor Lopetegi, and Ander Aldalur. "The effect of suspension systems on the sound insulation of suspended ceilings: A finite element analysis." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A86. http://dx.doi.org/10.1121/10.0022888.

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It has been shown via laboratory measurements that the airborne and impact sound insulation of a concrete floor structure with a suspended plasterboard ceiling can be improved by using elastic ceiling suspension systems. The weighted airborne sound reduction index R w was increased by 7dB and the normalized impact sound pressure level L n,w was decreased by 15 dB when using elastic ceiling hangers as opposed to fixed hangers. In order to study the effect of elastic ceiling hangers on sound insulation further and to make it easier to compare different suspension systems especially in the low fr

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Hendinata, Laurentius Kevin. "Calculating Flanking Transmission for Improved Airborne Sound Insulation in Buildings." International Journal of Architecture and Urbanism 8, no. 1 (2024): 30–37. http://dx.doi.org/10.32734/ijau.v8i1.14441.

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The complexities of airborne noise insulation in tropical buildings provide challenges for predicting the value of airborne noise in buildings. The analysis employs standardized metrics, the Weighted Sound Reduction Index (DnT,w), to evaluate the impact of wall, floor, and ceiling combinations on acoustic performance. Notably, the study addresses the persistent challenge of flanking transmission, contributing to disparities between predicted and measured values. This study focuses on common construction materials in Indonesia. The outcomes reveal that lightweight construction materials, such a

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Lastimosa, Jouana, Bianca Paula Fernandez, Quisa Nobe Rebamonte, Dawn Valerie Niere, Sheryl Cabardo, and Melchie Jaca. "Do Up Ceiling System for the Viewing Room, Cebu Technological University, Main Campus, Cebu City." Psychology and Education: A Multidisciplinary Journal 24, no. 8 (2024): 880–91. https://doi.org/10.5281/zenodo.13683584.

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This study aims to improve the learning environment of a university viewing room by rehabilitating and refurbishing its ceiling, highlighting the critical role of infrastructure in education. The project is driven by the recognition that a well-maintained ceiling is essential for students' physiological well-being, eyesight health, safety, and comfort. Research indicates that poor air circulation in congested spaces with low ceilings can exacerbate the spread of airborne diseases, while inadequate ceiling illumination can harm visual health. Furthermore, exposed electric wires and an aesthetic

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Sadeghian, Parastoo, and Sasan Sadrizadeh. "Impact of design parameters of diffuse ceiling ventilation systems on indoor air quality in school classrooms: a numerical assessment." E3S Web of Conferences 362 (2022): 14001. http://dx.doi.org/10.1051/e3sconf/202236214001.

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Indoor air quality directly impacts an individual’s productivity and health condition in office buildings, hospitals, schools, and residential buildings. Diffuse ceiling systems have been used widely in classrooms at schools that have high heat loads. In this regard, this study investigated the role of diffuse ceiling design parameters, including active diffuse panels’ configuration and contamination locations, on indoor air quality in a classroom. The spread of airborne infectious diseases was simulated using computational fluid dynamics techniques. The results revealed that the central confi

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Wamil, Nicomedes B., Dexter T. Balmaceda, Boots F. Fernandez, et al. "Assessment of Airborne Microbial Contaminants Using Passive Sampling Technique." UTTAR PRADESH JOURNAL OF ZOOLOGY 45, no. 21 (2024): 294–301. http://dx.doi.org/10.56557/upjoz/2024/v45i214638.

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The primary aim of this study was to evaluate airborne microbial contaminants in a laboratory setting using a passive sampling technique. Results indicated higher counts of bacteria in the air of the laboratory at ceiling level (total bacteria = 5.36±0.06 log10 CFU/m3; total coliform = 3.69±0.37 log10 CFU/m3) compared to near the ground (total bacteria = 5.17±0.01 log10 CFU/m3; total coliform = 3.45±0.06 log10 CFU/m3). Conversely, filamentous fungi showed higher counts closer to the ground (4.19±0.27 log10 CFU/m3) than from the ceiling (3.82±0.40 log10 CFU/m3). The total bacterial count in the

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6

Nurzyński, Jacek, and Łukasz Nowotny. "Acoustic Performance of Floors Made of Composite Panels." Materials 16, no. 5 (2023): 2128. http://dx.doi.org/10.3390/ma16052128.

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Airborne and impact sound insulation of composite panels arranged in different configurations were investigated in this study. The use of Fiber Reinforced Polymers (FRPs) in the building industry is growing; however, poor acoustic performance is a critical issue for their general employment in residential buildings. The study aimed to investigate possible methods of improvement. The principal research question involved the development of a composite floor satisfying acoustic expectations in dwellings. The study was based on the results of laboratory measurements. The airborne sound insulation

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Lange, J. H., and K. W. Thomulka. "Airborne Exposure Concentrations During Asbestos Abatement of Ceiling and Wall Plaster." Bulletin of Environmental Contamination and Toxicology 69, no. 5 (2002): 712–18. http://dx.doi.org/10.1007/s00128-002-0119-1.

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8

Obadiah, Jason. "FIELD MEASUREMENT OF AIRBORNE SOUND INSULATION BETWEEN ROOMS." Ultimart: Jurnal Komunikasi Visual 12, no. 1 (2020): 24–33. http://dx.doi.org/10.31937/ultimart.v12i1.1397.

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   Airborne sound can be a nuisance and a constant expose to the sound can in- troduced health problems to the people in the area especially areas where quiet environ- ment is a necessity. The objective of this measurement is to demonstrate the field mea- surement of the airborne sound insulation properties of interior walls. The measurement was done for determining the sound insulation properties of a partition between two rooms. This measurement will also determine the parameters and source of the prob- lems which are contributing to the airborne sound from the adjacent roo

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9

Lim, Yongtaek, Hongseok Jang, and Seungyoung So. "Evaluation of Mineral Carbonation of Asbestos-Tex and Analysis of Airborne Asbestos Concentrations." Buildings 12, no. 9 (2022): 1372. http://dx.doi.org/10.3390/buildings12091372.

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Asbestos is a human carcinogen that causes diseases, such as lung cancer and malignant mesothelioma. In Korea, approximately 1.23 × 109 kg of asbestos raw materials was imported for about 30 years. More than 80% of this were used as building material, such as interior materials and ceiling materials. Among the manufactured asbestos-containing materials, the closest product to the human body is asbestos-tex, used as ceiling material. In this study, asbestos contained in asbestos-tex was transformed into a shape that is physically safe for the human body through mineral carbonation and the resul

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10

Li, Wenxin, Adrian Chong, Takamasa Hasama, et al. "Effects of ceiling fans on airborne transmission in an air-conditioned space." Building and Environment 198 (July 2021): 107887. http://dx.doi.org/10.1016/j.buildenv.2021.107887.

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11

Cheong, Chang-Heon. "Combination of Mechanical Ventilation and Ceiling Fin to Reduce Airborne Infection Risk." Journal of The Korean Society of Living Environmental System 30, no. 1 (2023): 121–29. http://dx.doi.org/10.21086/ksles.2023.2.30.1.121.

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12

Gendreau, Michael, and Hal Amick. "Extremely low-vibration experiments with resolutions nanometer range supported on air tables may also require a low-noise environment." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 269, no. 2 (2024): 914–22. http://dx.doi.org/10.3397/nc_2024_0124.

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The paper reports key results from an extensive diagnostic study examining a room's vibration and acoustic noise environments and their correlation to measurement noise. Vibrations of unknown origin were contaminating research being performed on highly vibration-sensitive apparatus in the basement of a recently completed engineering building. The research involved extensive single‐molecule microscopy requiring resolutions down to 1 nm carried out on an optical table supported on pneumatic legs. Researchers reported that the experimental noise was reported to be of random amplitude less than 40

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Keyes, D. L., J. Chesson, W. M. Ewing, et al. "EXPOSURE TO AIRBORNE ASBESTOS ASSOCIATED WITH SIMULATED CABLE INSTALLATION ABOVE A SUSPENDED CEILING." American Industrial Hygiene Association Journal 52, no. 11 (1991): 479–84. http://dx.doi.org/10.1080/15298669191365081.

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14

Persson, Mikael, and Jan van der Linden. "Wound Ventilation With Ultraclean Air for Prevention of Direct Airborne Contamination During Surgery." Infection Control & Hospital Epidemiology 25, no. 4 (2004): 297–301. http://dx.doi.org/10.1086/502395.

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AbstractBackground and Objective:Despite the novelties in operating room ventilation, airborne bacteria remain an important source of surgical wound contamination. An ultraclean airflow from the ceiling downward may convey airborne particles from the surgical team into the wound, thus increasing the risk of infection. Therefore, similar ventilation from the wound upward should be considered. We investigated the effect of wound ventilation on the concentration of airborne particles in a wound model during simulated surgery.Design:Randomized experimental study simulating surgery with a wound cav

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15

Cheong, Chang-Heon, Seok-Ho Hwang, and Beungyong Park. "Implementation of Ceiling Fin to Prevent the Spread of Airborne Pathogens by Buoyancy Effect." Journal of The Korean Society of Living Environmental System 29, no. 3 (2022): 297–304. http://dx.doi.org/10.21086/ksles.2022.6.29.3.297.

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16

Xu, Jingfeng, Joseph Nannariello, and Fergus R. Fricke. "Predicting and optimising the airborne sound transmission of floor–ceiling constructions using computational intelligence." Applied Acoustics 65, no. 7 (2004): 693–704. http://dx.doi.org/10.1016/j.apacoust.2003.12.004.

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17

Cheung, Toby, and Kwok Wai Tham. "Effects of ceiling fan and window exhaust on aerosol transmission risk during home quarantine situation." E3S Web of Conferences 396 (2023): 02006. http://dx.doi.org/10.1051/e3sconf/202339602006.

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SARS-CoV-2 has been recognized to be airborne transmissible. With the increased transmissibility leading to increasingly reported positive cases, home quarantine is adopted for the infected patients who are not seriously ill. However, the risk of household aerosol transmission is not well studied. We conducted tracer gas experiment to simulate the exhaled virus laden aerosols from a patient under home quarantine situation inside a residential testbed. The Sulphur hexafluoride concentration (SF6,conc) was measured both inside and outside the quarantine room under various scenarios including, (i

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18

Beggs, Clive B., Rabia Abid, Fariborz Motallebi, Abdus Samad, Nithya Venkatesan, and Eldad J. Avital. "Airborne Transmission of SARS-CoV-2: The Contrast between Indoors and Outdoors." Fluids 9, no. 3 (2024): 54. http://dx.doi.org/10.3390/fluids9030054.

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COVID-19 is an airborne disease, with the vast majority of infections occurring indoors. In comparison, little transmission occurs outdoors. Here, we investigate the airborne transmission pathways that differentiate the indoors from outdoors and conclude that profound differences exist, which help to explain why SARS-CoV-2 transmission is much more prevalent indoors. Near- and far-field transmission pathways are discussed along with factors that affect infection risk, with aerosol concentration, air entrainment, thermal plumes, and occupancy duration all identified as being influential. In par

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19

Zhou, Jianhui, Chenyue Guo, Mohammad Hossein A. Jafari, and Brant York. "Vibroacoustic performance of a mass timber cassette floor through mock-up tests." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A241. http://dx.doi.org/10.1121/10.0027363.

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Though cross laminated timber slab floors are being used increasingly in mass timber construction, solid mass timber slab floors are limited to short-to-medium span applications. The sound insulation performance of solid mass timber slab floors is often achieved through assemblies on the floor surface as exposed wood ceilings are often prefered by achitects and occupants. A mass timber cassete floor system has been recently designed and tested for its structural, vibrational and acoustical performance. This paper reports the vibroacoustic performance of the proprietary floor system through moc

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20

Dong, Wayland, Devin Wong, and John LoVerde. "Gauge repeatability and reproducibility study of airborne sound isolation measurements." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 3 (2021): 3900–3908. http://dx.doi.org/10.3397/in-2021-2553.

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A gauge repeatability and reproducibility study (GRR) uses analysis of variations (ANOVA) on an appropriately designed experiment to separate and quantify the components of the overall uncertainty. The authors have previously presented results of GRR studies of the measurement of airborne and impact insulation of floor-ceiling and demising wall assemblies in several apartment buildings, in which the uncertainty in the measurement method and the variability of the nominally-identical assemblies were compared. The results of two additional GRR studies on measurements of airborne noise isolation

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21

Takahashi, Toshiki, Akinori Hashimoto, Shunsuke Tokoi, and Makoto Goto. "Feasibility of Ceiling-Mounted Assist Device of Air-Purifier for Removal of Airborne Allergic Pollen Grains." Key Engineering Materials 643 (May 2015): 205–8. http://dx.doi.org/10.4028/www.scientific.net/kem.643.205.

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Feasibility of a ceiling-mounted assist device of the air-purifier for removal of airborne allergenic pollen grains is investigated by both turbulent flow and particle-tracking calculations. The device is mounted straight above the air-purifier and it collects suspended pollen grains in the exhaust flow of the air-purifier. It is found from the turbulent flow calculation that the flow rate of the assist device should be larger than that of the air-purifier. Otherwise the upward air flows around the assist device, and pollen grains move along the surrounding flow; they are never removed from th

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22

Han, Xiaofei, Norhayati Mahyuddin, Mingyuan Qin, et al. "Effect of Different Mechanical Fans on Virus Particle Transport: A Review." Buildings 15, no. 3 (2025): 303. https://doi.org/10.3390/buildings15030303.

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In recent years, repeated outbreaks of airborne viruses have normalized human coexistence with these viruses. The complex turbulence and vortices generated by different fan types and operation modes affect virus removal effectiveness. This paper reviews the potential impact and actual effectiveness of different fans in mitigating indoor virus transmission, highlighting their advantages and limitations. Downward rotating ceiling fans can rapidly dilute virus concentration (21–87%) in the breathing zone due to jet cores, with efficiency depending on rotational speed and particle diameter. Howeve

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Dong, Wayland, and John LoVerde. "Quantitative comparisons of resilient channel designs in walls and ceilings." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 264, no. 1 (2022): 471–77. http://dx.doi.org/10.3397/nc-2022-757.

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Resilient channel is common within lightweight construction to improve the airborne and impact noise isolation of wall and floor-ceiling assemblies. The authors have previously presented results from systematic studies of resilient channels in wood stud wall assemblies (Internoise 2009; International Congress on Acoustics 2010) and wood-joist floor assemblies (International Congress on Sound and Vibration 2015) in which the effect of brand and model of resilient channel was compared in various assemblies. These studies documented the clear and significant acoustical performance differences bet

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24

Lange, J. H., S. L. M. Sites, G. Mastrangelo, and K. W. Thomulka. "Exposure to Airborne Asbestos During Abatement of Ceiling Material, Window Caulking, Floor Tile, and Roofing Material." Bulletin of Environmental Contamination and Toxicology 77, no. 5 (2006): 718–22. http://dx.doi.org/10.1007/s00128-006-1122-8.

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Lange, J. H., S. L. M. Sites, G. Mastrangelo, and K. W. Thomulka. "Exposure to Airborne Asbestos During Abatement of Ceiling Material, Window Caulking, Floor Tile and Roofing Material." Bulletin of Environmental Contamination and Toxicology 80, no. 1 (2007): 10–13. http://dx.doi.org/10.1007/s00128-007-9280-x.

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26

Bandarenka, Hanna, Aliaksandr Burko, Kseniya Girel, et al. "Improvement of Heat Dissipation in Ag/Ni Substrates for Testing Cu-TiO2/TiO2-Modified Filters Using SERS Spectroscopy." Crystals 13, no. 5 (2023): 749. http://dx.doi.org/10.3390/cryst13050749.

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Surface-enhanced Raman scattering (SERS) spectroscopy is used to investigate a composition of wash swabs from the Cu-TiO2/TiO2-modified filters with disinfecting ability. Macroporous Si chips coated with conformal 800 nm thick Ni layer and Ag particles (Ag/Ni) are engineered to act as SERS-active substrates. Such substrates are characterized by a moderate reflection band in the visible range and provide an improved heat dissipation from contaminants in wash swabs during SERS study. This prevents thermal-induced destruction of analyzing media for reliable assessment of its composition. The anat

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27

Gaillard, Antoine, Detlef Lohse, Daniel Bonn, and Fahmi Yigit. "Reconciling Airborne Disease Transmission Concerns with Energy Saving Requirements: The Potential of UV-C Pathogen Deactivation and Air Distribution Optimization." Indoor Air 2023 (August 16, 2023): 1–12. http://dx.doi.org/10.1155/2023/3927171.

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The COVID-19 pandemic caused a paradigm shift in our way of using heating, ventilation, and air-conditioning (HVAC) systems in buildings. In the early stages of the pandemic, it was indeed advised to reduce the reuse and thus the recirculation of indoor air to minimize the risk of contamination through inhalation of virus-laden aerosol particles emitted by humans when coughing, sneezing, speaking, or breathing. However, such recommendations are not compatible with energy saving requirements stemming from climate change and energy price increase concerns, especially in winter and summer when th

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Leng, Pau Chung, Siew Bee Aw, Nor Eeda Haji Ali, Gabriel Hoh Teck Ling, Yoke Lai Lee, and Mohd Hamdan Ahmad. "Solar Chimneys as an Effective Ventilation Strategy in Multi-Storey Public Housing in the Post-COVID-19 Era." Buildings 12, no. 6 (2022): 820. http://dx.doi.org/10.3390/buildings12060820.

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This paper studies the effectiveness of a solar chimney for improving ventilation and air-exchange rates in multi-storey public housing in tropical climates for the potential mitigation of airborne disease transmission. Virtual models of a typical apartment room with natural cross-ventilation, replicated across four levels to mimic a multi-storey block, were set up with six internal wind velocity sensor points per floor. The simulation software Energy2D was then used to evaluate the performance of the models, first testing the presence of a solar chimney, and then additionally the degree to wh

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Qian, Cheng, Lin Hu, Christian Dagenais, and Sylvain Gagnon. "Acoustic design tools for estimation of sound insulation performance of wood wall and floor assemblies." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (2021): 267–74. http://dx.doi.org/10.3397/in-2021-1384.

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The National Building Code of Canada 2015 stipulates the minimum requirements of the airborne sound insulation transmission through common interior walls and ceiling/floor assemblies. The required minimum Apparent Sound Transmission Class (ASTC) is 47 in Canada, whereas the Impact Insulation Class (IIC) for floors is recommended to be higher than 55. For many years, significant efforts were made to develop sound insulation prediction models or tools to predict the sound insulation performance of wall and floor/ceiling assemblies at the design phase in order to meet the requirements and the rec

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Hewlett, Angela L., Scott E. Whitney, Shawn G. Gibbs, Philip W. Smith, and Hendrik J. Viljoen. "Mathematical Modeling of Pathogen Trajectory in a Patient Care Environment." Infection Control & Hospital Epidemiology 34, no. 11 (2013): 1181–88. http://dx.doi.org/10.1086/673451.

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Objective.Minimizing healthcare worker exposure to airborne infectious pathogens is an important infection control practice. This study utilized mathematical modeling to evaluate the trajectories and subsequent concentrations of particles following a simulated release in a patient care room.Design.Observational study.Setting. Biocontainment unit patient care room at a university-affiliated tertiary care medical center.Methods. Quantitative mathematical modeling of airflow in a patient care room was achieved using a computational fluid dynamics software package. Models were created on the basis

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31

Campopiano, Antonella, Aneta Maria Zakrzewska, Angelo Olori, Annapaola Cannizzaro, Fulvio Basili, and Deborah Ramires. "Glass fiber exposure assessment during ceiling installation by European Standard EN 689: study of airborne fiber distribution." Atmospheric Pollution Research 3, no. 2 (2012): 192–98. http://dx.doi.org/10.5094/apr.2012.020.

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Krasinski, Keith, Robert S. Holzman, Bruce Hanna, M. Alba Greco, Michael Graff, and Madhu Bhogal. "Nosocomial Fungal Infection During Hospital Renovation." Infection Control 6, no. 7 (1985): 278–82. http://dx.doi.org/10.1017/s0195941700061750.

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AbstractNosocomial fungal pulmonary infections (Zygomycetes, Aspergillussp.) developed in two premature infants in a special care unit (SCU) adjacent to an area of renovation. Inspection showed that inadequate barriers permitted the passage of airborne particles between the two areas, and cultures confirmed a significantly higher (p≤0.05) density of mold spores in the SCU (0.88 cfu per hour per settling plate) compared to a construction-free comparison area (0.22 cfu per hour per settling plate). The major source of mold was the dust above the hospital's false ceiling. In another construction

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Kraler, Anton, and Paola Brugnara. "Acoustic behaviour of CLT structures: influence of decoupling bearing stripes, floor assembly and connectors under storey-like loads." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 6 (2023): 1179–90. http://dx.doi.org/10.3397/in_2022_0162.

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Timber buildings do not have a high acoustic performance regarding vibration transmission through the structure. Sophisticated acoustic design methods are usually not applied and noise control design for wooden buildings is often merely based on the experience of engineers. To find out the peculiarity of timber transmission, an acoustic lab test with CLT was set up. Several measurement configurations were built and airborne sound measurements according to EN ISO 16283-1 and impact sound measurements according to EN ISO 16283-2 were carried out. The test results were set in relation to referenc

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Vernez, David, Olivier Duperrex, Horacio Herrera, et al. "Exposure to Amosite-Containing Ceiling Boards in a Public School in Switzerland: A Case Study." International Journal of Environmental Research and Public Health 16, no. 24 (2019): 5069. http://dx.doi.org/10.3390/ijerph16245069.

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The measurement of an airborne concentration in Amosite fibers above 5035 F/m3 in a school prompted a retrospective quantitative health risk assessment. Dose estimates were built using air measurements, laboratory experiments, previous exposure data, and interviews. A dose response model was adapted for amosite-only exposure and adjusted for the life expectancy and lung cancer incidence in the Swiss population. The average yearly concentrations found were 52–320 F/m3. The high concentration previously observed was not representative of the average exposure in the building. Overall, the risk es

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Miścicki, Stanisław, and Krzysztof Stereńczak. "A two-phase inventory method for calculating standing volume and tree-density of forest stands in central Poland based on airborne laser-scanning data." Forest Research Papers 74 (2) (March 1, 2013): 127–36. https://doi.org/10.2478/frp-2013-0013.

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This paper describes a method of determining the stocking density and volume of forest stands based on airborne laser-scanning data. The aim of this study was to determine the relationship between ground-based measurements of standing volume and tree-density, and those acquired based on the Crown Height Model (CHM) interpolated from airborne laser scanning data. Data were collected from 34 sample plots of two sizes for the CHM analysis: 500 m<sup>2</sup> (radius 12.61 m) and 1963.5 m<sup>2</sup> (radius of 25.0 m): Trees for sampling were selected using two methods, those whose “centroid

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Kujundzic, Elmira, David A. Zander, Mark Hernandez, Largus T. Angenent, David E. Henderson, and Shelly L. Miller. "Effects of Ceiling-Mounted HEPA-UV Air Filters on Airborne Bacteria Concentrations in an Indoor Therapy Pool Building." Journal of the Air & Waste Management Association 55, no. 2 (2005): 210–18. http://dx.doi.org/10.1080/10473289.2005.10464612.

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Salie, Faiza, Pasquale Scarpino, Scott Clark, and Klaus Willeke. "Laboratory Evaluation of Airborne Microbial Reduction by an Ultraviolet Light Positioned in a Modified Hollow Ceiling Fan Blade." American Industrial Hygiene Association Journal 56, no. 10 (1995): 987–92. http://dx.doi.org/10.1080/15428119591016412.

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Tabacco, Ignazio E., Cesido Bianchi, Achille Zirizzotti, Enrico Zuccheretti, Alessandro Forieri, and Alessio Della Vedova. "Airborne radar survey above Vostok region, east-central Antarctica: ice thickness and Lake Vostok geometry." Journal of Glaciology 48, no. 160 (2002): 62–69. http://dx.doi.org/10.3189/172756502781831656.

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AbstractDuring the 1999–2000 Italian Expedition, an airborne radar survey was performed along 12 transects across Lake Vostok, Antarctica, and its western and eastern margins. Ice thickness, subglacial elevation and the precise location of lake boundaries were determined. Radar data confirm the geometry derived from previous surveys, but with some slight differences. We measured a length of up to 260 km, a maximum width of 81 km and an area of roughly 14 000 km2. Along the major axis, from north to south, the ice thickness varies from 3800 to 4250 m, with a decreasing gradient. From west to ea

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Smith, A. T., and I. A. Barrie. "Winter performance of a cross-flow automatically controlled naturally ventilated (ACNV) pig finishing house." Proceedings of the British Society of Animal Production (1972) 1986 (March 1986): 130. http://dx.doi.org/10.1017/s0308229600016366.

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Automatically Controlled Natural Ventilation (ACNV) has been shown to give good control over ventilation rates in pig houses under a wide range of climatic conditions (1, 2 and 3). Ventilation control is the principal means of governing the house temperature. A lower house temperature implies higher ventilation rates and a lower concentration of airborne contaminants. In cold weather, therefore, there is an incentive to set the house temperature as low as practical considerations will allow. One important constraint is the temperature variation within the house. The present study was undertake

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Kim, Gihoon, Jongil Bang, and Minki Sung. "Contaminant removal effectiveness evaluation of ventilation, UR-UVGI, and air cleaner using CFD in negative pressure isolation ward." E3S Web of Conferences 396 (2023): 01025. http://dx.doi.org/10.1051/e3sconf/202339601025.

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A negative pressure isolation ward (NPIW) is designed to create negative pressure to prevent the spread of airborne viruses. Therefore, it is necessary to increase the contaminant removal effect in the NPIW. To reduce indoor air contaminants, upper room-ultraviolet germicidal irradiation (UR-UVGI) and air cleaner are being used. Unlike the UR-UVGI, the air cleaner generates airflow. Therefore, the contaminant removal effect may differ according to the ventilation methods. This study is to compare ventilation, UR-UVGI, and air cleaner contaminant removal effects using CFD and Contaminant Remova

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Li, Jiangbo, and Yunfei Ding. "Investigation on the Contaminant Distribution with Dedicated Outdoor Air System in Restaurant." E3S Web of Conferences 356 (2022): 05045. http://dx.doi.org/10.1051/e3sconf/202235605045.

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The continual transmission of epidemics makes health workers aware of the importance of airborne transmission in special cases. The well-known equation Wells-Riley highlights the importance of ventilation to dilution of infectious aerosol as well. And the airborne transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been confirmed. The main problem of the coronavirus disease 2019 (COVID-19) epidemic of three families in a restaurant in Guangzhou lies in unreasonable ventilation. An air-conditioning system of Ceiling radiant cooling plate (CRCP) combined with a dedic

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Bettarello, Federica, Andrea Gasparella, and Marco Caniato. "The Influence of Floor Layering on Airborne Sound Insulation and Impact Noise Reduction: A Study on Cross Laminated Timber (CLT) Structures." Applied Sciences 11, no. 13 (2021): 5938. http://dx.doi.org/10.3390/app11135938.

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The use of timber constructions recently increased. In particular, Cross Laminated Timber floors are often used in multi-story buildings. The development of standardization processes, product testing, design of details and joints, the speed of construction, and the advantages of eco-sustainability are the main reasons why these structures play a paramount role on the international building scene. However, for further developments, it is essential to investigate sound insulation properties, in order to meet the requirements of indoor comfort and comply with current building regulations. This wo

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Du, Chengbo, and Qingyan Chen. "Impacts of Respiratory Activities on Infection Risk of COVID-19 in a Passenger Elevator." E3S Web of Conferences 396 (2023): 01024. http://dx.doi.org/10.1051/e3sconf/202339601024.

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Contaminant transport and flow distribution are very important during an elevator ride, as the reduced social distancing may increase the infection rate of airborne diseases such as COVID-19. This investigation used a computational fluid dynamics (CFD) model based on the RNG k–ϵ turbulence model to predict airflow and particle transport in an elevator-lobby area with moving passengers. The CFD results showed a complex airflow pattern due to the downwash air supply from the ceiling and the upward thermal plumes generated by passengers. This investigation studied different respiratory activities

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Homb, Anders, and Simone Conta. "Comparison of the direct sound insulation for wooden joist, CLT and timber hollow box floors." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 5 (2023): 2509–18. http://dx.doi.org/10.3397/in_2022_0353.

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Timber buildings are now present worldwide, and their market is growing rapidly, pushed by sustainability and environmental arguments. Several technological options for engineered wood systems are available and well developed, the most common being wooden joist, CLT and timber hollow box. In this paper, we present a comparative study of the airborne and impact sound insulation of the three options. The analysis is based on data collected from laboratory measurements. The results include the comparison of the bare floor construction and examples of assemblies with additional floating floor, sus

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Le, Thanh-Long, Tan Tien Nguyen, and Trung Tin Kieu. "A CFD Study on the Design Optimization of Airborne Infection Isolation Room." Mathematical Problems in Engineering 2022 (October 3, 2022): 1–10. http://dx.doi.org/10.1155/2022/5419671.

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Airborne infection isolation (AII) rooms are used to accommodate patients with highly infectious diseases and keep the released pathogens to limit the risk of cross-infection. This paper proposes a concept for an AII room made from two shipping containers to handle the scarcity of hospital beds when the COVID-19 disease spreads over the world. The proposed system consists of the main isolation room, anteroom, and toilet as well as other functional areas. In addition, the main isolation room was modeled with important components such as a supply air vent, exhaust air, a patient, and a bed. The

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Brasel, T. L., D. R. Douglas, S. C. Wilson, and D. C. Straus. "Detection of Airborne Stachybotrys chartarum Macrocyclic Trichothecene Mycotoxins on Particulates Smaller than Conidia." Applied and Environmental Microbiology 71, no. 1 (2005): 114–22. http://dx.doi.org/10.1128/aem.71.1.114-122.2005.

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ABSTRACT Highly respirable particles (diameter, <1 μm) constitute the majority of particulate matter found in indoor air. It is hypothesized that these particles serve as carriers for toxic compounds, specifically the compounds produced by molds in water-damaged buildings. The presence of airborne Stachybotrys chartarum trichothecene mycotoxins on particles smaller than conidia (e.g., fungal fragments) was therefore investigated. Cellulose ceiling tiles with confluent Stachybotrys growth were placed in gas-drying containers through which filtered air was passed. Exiting particulates were co

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Quinn, Margaret, John Lindberg, Rebecca Gore, et al. "322 Quantitative assessment of US home care aides’ respiratory exposures during residential bathroom cleaning and disinfecting using household products." Annals of Work Exposures and Health 68, Supplement_1 (2024): 1. http://dx.doi.org/10.1093/annweh/wxae035.127.

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Abstract Introduction In the USA, home care (HC) aide visits to clients’ homes typically involve cleaning and disinfecting (C&D). Some ingredients in household C&D products are associated with respiratory illness: sodium hypochlorite (bleach), quaternary ammonium compounds (QACs), and volatile organic compounds (VOCs). This study assessed quantitatively HC aides’ airborne exposures during bathroom cleaning using conventional and “green” C&D products. Methodology Aides performed C&D tasks in a simulated residential bathroom constructed in an environmental air sampling laboratory

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Tonyan, Timothy D., Stephen W. Payne, and Robert Elfering. "Characterization of airborne sound transmission and impact isolation in floor/ceiling assemblies with structural cementitious floor sheathing and cold formed steel framing." Journal of the Acoustical Society of America 124, no. 4 (2008): 2441. http://dx.doi.org/10.1121/1.4782560.

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Liu, Xiang-Long, Guang-Cai Gong, Heng-Sheng Cheng, and Li-Xing Ding. "Airflow and Heat Transfer in the Slot-Vented Room with Radiant Floor Heating Unit." Journal of Applied Mathematics 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/287271.

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Radiant floor heating has received increasing attention due to its diverse advantages, especially the energy saving as compared to the conventional dwelling heating system. This paper presents a numerical investigation of airflow and heat transfer in the slot-vented room with the radiant floor heating unit. Combination of fluid convection and thermal radiation has been implemented through the thermal boundary conditions. Spatial distributions of indoor air temperature and velocity, as well as the heat transfer rates along the radiant floor and the outer wall, have been presented and analyzed c

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Hong Yee Kek, Huiyi Tan, Desmond Daniel Chin Vui Sheng, et al. "A CFD assessment on ventilation strategies in mitigating healthcare-associated infection in single patient ward." Progress in Energy and Environment 24, no. 1 (2023): 35–45. http://dx.doi.org/10.37934/progee.24.1.3545.

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A promising ventilation strategy is an effective measure to enhance indoor air quality and protect the patients against healthcare-acquired infection. The Computational Fluid Dynamics (CFD) model represents a patient ward that was constructed using Computer-Aided Design (CAD) software. The simulated results were verified and validated based on the published data. A Renormalization Group (RNG) k-epsilon model based on the Eulerian approach was used to simulate the airflow turbulence, while a discrete phase model (DPM) based on the Lagrangian approach was used to predict the dispersion of airbor

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