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Journal articles on the topic 'Filtres – Humidité'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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1

Aqueveque, Pablo, Macarena Díaz, Britam Gomez, et al. "Embedded Electronic Sensor for Monitoring of Breathing Activity, Fitting and Filter Clogging in Reusable Industrial Respirators." Biosensors 12, no. 11 (2022): 991. http://dx.doi.org/10.3390/bios12110991.

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Millions of workers are required to wear reusable respirators in several industries worldwide. Reusable respirators include filters that protect workers against harmful dust, smoke, gases, and vapors. These hazards may cause cancer, lung impairment, and diseases. Respiratory protection is prone to failure or misuse, such as wearing respirators with filters out of service life and employees wearing respirators loosely. Currently, there are no commercial systems capable of reliably alerting of misuse of respiratory protective equipment during the workday shifts or provide early information about

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2

Widziewicz-Rzońca, Kamila, Sławomir Janas, Barbara Błaszczak, et al. "ADVANCING THE UNDERSTANDING OF PM FILTER MASS STABILITY: UNVEILING THE INFLUENCE OF HUMIDITY AND TEMPERATURE." Zeszyty Naukowe Pro Publico Bono 1, no. 1 (2023): 7–26. http://dx.doi.org/10.5604/01.3001.0053.9741.

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The intricate interplay between humidity and temperature on PM filter performance has remaineda subject of profound scientific interest. By employing fully-automated weighing method anda two-factor regression model, the study aimed to evaluate mass variations of unloaded PM filtersunder diverse humidity and temperature conditions. Existing guidelines, as posited by the USEPA and the European Standard (EN), have demonstrated a pronounced disparity. The US EPAadvocates a narrow humidity range of 30–40% RH, while the EN suggests a broader range of40–50% RH. The results of this investigation confi

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3

Myers, David L., and B. Dean Arnold. "Electret Media for HVAC Filtration Applications." International Nonwovens Journal os-12, no. 4 (2003): 1558925003os—12. http://dx.doi.org/10.1177/1558925003os-1200412.

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Air filters produced with charged, or electret, media for HVAC filtration applications have gained significant market share and acceptance over the past few years. While these filters provide the advantage of high initial efficiency and low pressure drop, there are concerns about their ability to maintain efficiency in service. Furthermore, there is a tendency to classify all electret media in the same general category without any consideration of media structure, fiber size, and charging technique. Current research suggests that a variety of factors influence the loss of efficiency in use inc

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4

Abd Ali, Safaa Abd Zaid, Aurélie Joubert, and Yves Andrès. "Evaluation of Antimicrobial Effect of Zinc Pyrithione against Airborne Fungi and Bacteria Growth Collected onto New and Loaded HVAC Fibrous Filters." Processes 9, no. 9 (2021): 1528. http://dx.doi.org/10.3390/pr9091528.

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Microbial growth onto HVAC filters was observed in real conditions with possible degradation of the indoor air quality. The filtration performance of marketed antimicrobial filters containing zinc pyrithione was tested under laboratory conditions and compared to that of similar filters with the same classification, F7 (EN779:2002). The filtration performance of the two tested filters during loading with PM10 particles was quantified in an experimental setup with filter pressure drop measurement and particle counting upstream and downstream of the filters. The microbial growth on the new and lo

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5

Widziewicz-Rzońca, Kamila, and Malwina Tytła. "Water Sorption by Different Types of Filter Media Used for Particulate Matter Collection Under Varying Temperature and Humidity Conditions." International Journal of Environmental Research and Public Health 17, no. 14 (2020): 5180. http://dx.doi.org/10.3390/ijerph17145180.

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The present study describes the effects of temperature and humidity on the level of water absorption by filter blanks most popularly used for gravimetric analyzes of particulate matter (PM) and the effects of those on the accuracy of its weight measurements. The main parts of the research quantified the effect of temperature and humidity conditions on water contents quartz fiber (Q), fiberglass (G), PTFE, and nylon (N) filters. Supplementary studies were conducted to estimate the effects of temperature, humidity and material on mass loss/gain and the shape of water retention. All chemical anal

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6

Dierkes, M., and U. Hilleringmann. "Telemetric surface acoustic wave sensor for humidity." Advances in Radio Science 1 (May 5, 2003): 131–33. http://dx.doi.org/10.5194/ars-1-131-2003.

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Abstract. Surface acoustic wave sensors consist of a piezoelectric substrate with metal interdigital transducers (IDT) on top. The acoustic waves are generated on the surface of the substrate by a radio wave, as it is well known in band pass filters. The devices can be used as wireless telemetric sensors for temperature and humidity, transmitting the sensed signal as a shift of the sensor’s resonance frequency.

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7

Chervinskii, Semyon, Ibrahim Issah, Markus Lahikainen, et al. "Humidity- and Temperature-Tunable Metal–Hydrogel–Metal Reflective Filters." ACS Applied Materials & Interfaces 13, no. 42 (2021): 50564–72. http://dx.doi.org/10.1021/acsami.1c15616.

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8

Shuthish, Elangkovan, Shafinaz Zainal Abidin Mastura, Fadzli Abd Rahman Shaharin, Shafiq Che Soh Mohammad, and Bukhairi Md Rashid Ahmad. "Economical fabrication of graphite/paper-based humidity sensor." Indonesian Journal of Electrical Engineering and Computer Science 20, no. 1 (2020): 54–59. https://doi.org/10.11591/ijeecs.v20.i1.pp54-59.

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Paper is regarded as a promising alternative for low-cost and biodegradable substrate. Paper can be a very good humidity detecting substrate due to its capability to absorb water vapour, thanks to its porous surface. This work explores the feasibility of developing a paper-based humidity sensor using simple and low cost fabrication process. Two type of electrode structures, namely interdigitated and parallel electrode, were formed by using two different pencil grade. The pencil grades used were 2B and 6B. The currentvoltage (I-V) characteristics of the fabricated device were measured under dif

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9

Chien, Chih-Hsiang, Chufan Zhou, Simon Yang Sing, et al. "Effects of Relative Humidity on Impregnated Filters Used in Measurement of Airborne Sulfur Dioxide." Annals of Work Exposures and Health 63, no. 7 (2019): 806–13. http://dx.doi.org/10.1093/annweh/wxz053.

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Abstract Impregnated filters treated with alkali and humectant were first used as collection media to assess occupational exposure to sulfur dioxide (SO2), as outlined in the National Institute for Occupational Safety and Health Method 6004 in 1979. Since then, updated treatment protocols have been proposed with decreased amounts of alkali and glycerol, which claim the same filtering capacity. However, there has been no report on how the collection of SO2 on such impregnated media is influenced by relative humidity (RH). This study investigated the role of glycerol (G) amount on impregnated fi

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10

Sidheswaran, Meera, Wenhao Chen, Agatha Chang, et al. "Formaldehyde Emissions from Ventilation Filters Under Different Relative Humidity Conditions." Environmental Science & Technology 47, no. 10 (2013): 5336–43. http://dx.doi.org/10.1021/es400290p.

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11

Lee, Jinwook, and Jooyoun Kim. "Material Properties Influencing the Charge Decay of Electret Filters and their Impact on Filtration Performance." Polymers 12, no. 3 (2020): 721. http://dx.doi.org/10.3390/polym12030721.

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Electret filters as opposed to mechanical filters display the enhanced ability to capture airborne particles with the electrostatic attraction. However, the environmental aging during shelf-life or use may cancel its benefit by dissipating the charges. This work investigates the polymeric attributes influencing the charge decay and the electrostatic filtration of electret filters, employing polymers with different dielectric constants (εr) and wettability. As accelerated aging, high temperature (120 °C) or high humidity (25 °C, 90% RH) was applied to the electret filters for 48 h. For the humi

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12

ROGOZIŃSKI, TOMASZ, and SERGEI TROFIMOV. "Principles of pulse-jet filters used in the woodworking industry." Annals of WULS, Forestry and Wood Technology 105 (June 6, 2019): 98–101. http://dx.doi.org/10.5604/01.3001.0013.7724.

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Principles of pulse-jet filters used in the woodworking industry. The pulse-jet filters used to separate wood dust and factors influencing their operation were described in this paper. The analysis of the possibility of the use of pulse-jet filters for wood dust separation presented in this work was based on two basic quantitative criteria. These are the separation efficiency and the pressure drop in the filtration process performed in a dust collector. The influence of wood dust type, filtration velocity and air relative humidity the separation efficiency and the pressure were described.

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13

Gryga, Michal, Dalibor Ciprian, and Petr Hlubina. "Distributed Bragg Reflectors Employed in Sensors and Filters Based on Cavity-Mode Spectral-Domain Resonances." Sensors 22, no. 10 (2022): 3627. http://dx.doi.org/10.3390/s22103627.

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Spectral-domain resonances for cavities formed by two distributed Bragg reflectors (DBRs) were analyzed theoretically and experimentally. We model the reflectance and transmittance spectra of the cavity at the normal incidence of light when DBRs are represented by a one-dimensional photonic crystal (1DPhC) comprising six bilayers of TiO2/SiO2 with a termination layer of TiO2. Using a new approach based on the reference reflectance, we model the reflectance ratio as a function of both the cavity thickness and its refractive index (RI) and show that narrow dips within the 1DPhC band gap can easi

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14

Joubert, A., J. C. Laborde, L. Bouilloux, S. Callé-Chazelet, and D. Thomas. "Influence of Humidity on Clogging of Flat and Pleated HEPA Filters." Aerosol Science and Technology 44, no. 12 (2010): 1065–76. http://dx.doi.org/10.1080/02786826.2010.510154.

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15

Nordbo, Annika, Pekka Kekäläinen, Erkki Siivola, Ivan Mammarella, Jussi Timonen, and Timo Vesala. "Sorption-Caused Attenuation and Delay of Water Vapor Signals in Eddy-Covariance Sampling Tubes and Filters." Journal of Atmospheric and Oceanic Technology 31, no. 12 (2014): 2629–49. http://dx.doi.org/10.1175/jtech-d-14-00056.1.

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Abstract Adsorption and desorption (together called sorption) processes in sampling tubes and filters of eddy-covariance stations cause attenuation and delay of water vapor signals, leading to an underestimation of water vapor fluxes by tens of percent. The aim of this work was (i) to quantify the effects on sorption in filters and tubes of humidity, flow rate, and dirtiness and (ii) to test a recently introduced sorption model that facilitates correction of fluxes. Laboratory measurements on the transport of water vapor pulses through tubes and filters were carried out, and eddy-covariance fi

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16

Beliuchenko, Dmytro, Kateryna Tishechkina, Tetiana Hannichenko, and Olga Salamatina. "Study of Humidity During Sand Dewatering Using a Cone-Shaped Installation." Key Engineering Materials 953 (August 25, 2023): 43–51. http://dx.doi.org/10.4028/p-tog6wu.

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The issue of moisture content of sand, which is used in construction as an aggregate for asphalt concrete mixtures, in the production of silicate building materials, roofing roll materials, and various types of glass, is considered. The results of an experimental study of the process of dewatering construction sand samples in conical warehouses under the conditions of using vacuum systems, depending on the time and placement scheme of needle filters, are presented.

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17

Sýkora, Vlastimil, and Čestmír Hylák. "Dynamická sorpční kapacita malých ochranných filtrů – průmyslové škodliviny." Krízový manažment 20, no. 1 (2021): 23–31. http://dx.doi.org/10.26552/krm.c.2021.1.23-31.

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The aim of the study was to assess the effects of input parameters on the value of dynamic sorption capacity of small protective filters used in the civil protection of the Czech Republic. Relative humidity, the concentration of the test substance/air mixture, type of filter, year of manufacture, batch and type of sorbent, were used as the monitored parameters. The measurements were performed using a gas-air mixture bas ed on cyclohexane, ammonia, sulphur dioxide, chlorine and sulfane. MOF, MOF-2, MOF-4, MOF-5 and MOF-6-M filters were used for the measurements. It has been detected that the te

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18

Woo, Myung-Heui, Adam Grippin, Diandra Anwar, Tamara Smith, Chang-Yu Wu, and Joseph D. Wander. "Effects of Relative Humidity and Spraying Medium on UV Decontamination of Filters Loaded with Viral Aerosols." Applied and Environmental Microbiology 78, no. 16 (2012): 5781–87. http://dx.doi.org/10.1128/aem.00465-12.

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ABSTRACTAlthough respirators and filters are designed to prevent the spread of pathogenic aerosols, a stockpile shortage is anticipated during the next flu pandemic. Contact transfer and reaerosolization of collected microbes from used respirators are also a concern. An option to address these potential problems is UV irradiation, which inactivates microbes by dimerizing thymine/uracil in nucleic acids. The objective of this study was to determine the effects of transmission mode and environmental conditions on decontamination efficiency by UV. In this study, filters were contaminated by diffe

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19

Givehchi, Raheleh, Qinghai Li, and Zhongchao Tan. "Filtration of Sub-3.3 nm Tungsten Oxide Particles Using Nanofibrous Filters." Materials 11, no. 8 (2018): 1277. http://dx.doi.org/10.3390/ma11081277.

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This work aims to understand the effects of particle concentration on the filtration of nanoparticles using nanofibrous filters. The filtration efficiencies of triple modal tungsten oxide (WOx) nanoparticles were experimentally determined at three different concentrations for the size range of 0.82–3.3 nm in diameter. All tests were conducted using polyvinyl alcohol (PVA) nano-fibrous filters at an air relative humidity of 2.9%. Results showed that the filtration efficiencies of sub-3.3 nm nanoparticles depended on the upstream particle concentration. The lower the particle concentration was,

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20

Khazraei Vizhemehr, Ali, Fariborz Haghighat, and Chang-Seo Lee. "Gas-phase filters breakthrough models at low concentration – Effect of relative humidity." Building and Environment 75 (May 2014): 1–10. http://dx.doi.org/10.1016/j.buildenv.2014.01.010.

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21

Jang, Jaehyuck, Kyungnam Kang, Niloufar Raeis‐Hosseini, et al. "Self‐Powered Humidity Sensor Using Chitosan‐Based Plasmonic Metal–Hydrogel–Metal Filters." Advanced Optical Materials 8, no. 9 (2020): 1901932. http://dx.doi.org/10.1002/adom.201901932.

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22

van Popta, A. C., J. J. Steele, S. Tsoi, J. G. C. Veinot, M. J. Brett, and J. C. Sit. "Porous Nanostructured Optical Filters Rendered Insensitive to Humidity by Vapor-Phase Functionalization." Advanced Functional Materials 16, no. 10 (2006): 1331–36. http://dx.doi.org/10.1002/adfm.200500899.

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23

Rong, Le, Yun Liang, Zhaoqian Li, et al. "Study of Bacterial Elution from High-Efficiency Glass Fiber Filters." Separations 12, no. 5 (2025): 110. https://doi.org/10.3390/separations12050110.

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Antibacterial filter materials have been effectively utilized for controlling biological contaminants and purifying indoor air, with the market for such materials experiencing continuous expansion. Currently, textile antibacterial testing standards are widely adopted to evaluate the antimicrobial efficacy of filter materials, yet no dedicated assessment protocols specifically tailored for filtration media have been established. This study aims to investigate the applicability of textile antibacterial testing methods to high-efficiency glass fiber filter materials (filtration efficiency > 99

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24

Tago, Yuichiro, Fumie Akimoto, Kuniyuki Kitagawa, Norio Arai, Stuart W. Churchill, and Ashwani K. Gupta. "Spectroscopic Measurements of High Emissivity Materials Using Two-Dimensional Two-Color Thermometry." Journal of Engineering for Gas Turbines and Power 127, no. 3 (2004): 472–77. http://dx.doi.org/10.1115/1.1917889.

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Radiative heat transfer characteristics from the surface of a substance coated with a high-emissivity material have been examined from the measured two-dimensional (2D) temperature distribution using two-color thermometry principle. The technique utilized a charge coupled device camera and optical filters having either wide or narrow wavelength bandpass filters. The results obtained were compared to evaluate the accuracy of the temperature measurements. The 2D emissivity distributions were also derived from the measured 2D temperature distributions. The results indicate that the substrate coat

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25

Bula Silvera, Antonio José, and Javier Juvinao. "Performance of silica gel filters used in an air conditioning system based in a vapor compression refrigeration system." Revista Facultad de Ingeniería Universidad de Antioquia, no. 31 (June 1, 2004): 73–83. http://dx.doi.org/10.17533/udea.redin.344500.

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In order to determine the humidity adsorption rate in a filter made out of silica gel, a series of experiments were carried out where the mass of silica gel per unit area and the velocity of the air coming to the filter were studied. The results showed that the amount of humidity removed by the filter increases as the density of silica gel is increased and the velocity of the air is reduced. However, a dimensionless variable obtained between the silica gel and the amount of humidity removed shows that the process is more effective as the density is reduced. The results are presented as a funct

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26

Zhang, Zhaobo, Mahmut S. Ersan, Paul Westerhoff, and Pierre Herckes. "Do Surface Charges on Polymeric Filters and Airborne Particles Control the Removal of Nanoscale Aerosols by Polymeric Facial Masks?" Toxics 12, no. 1 (2023): 3. http://dx.doi.org/10.3390/toxics12010003.

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The emergence of facial masks as a critical health intervention to prevent the spread of airborne disease and protect from occupational nanomaterial exposure highlights the need for fundamental insights into the interaction of nanoparticles (<200 nm) with modern polymeric mask filter materials. While most research focuses on the filtration efficiency of airborne particles by facial masks based on pore sizes, pressure drop, or humidity, only a few studies focus on the importance of aerosol surface charge versus filter surface charge and their role in the net particle filtration efficiency of

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27

Bae, Byeong-Soo, Yongmin Shin, Somin Park, Byoung-Jo Um, and Junho Jang. "78‐1: Highly Stable Luminescent Siloxane Encapsulated Nanocrystals Resin for Full Color‐Converting Display Applications." SID Symposium Digest of Technical Papers 56, S1 (2025): 670–72. https://doi.org/10.1002/sdtp.18898.

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Luminescent nanocrystals (LNCs), including quantum dots (QDs) and perovskite nanocrystals (PNCs), are essential for next‐generation display technologies due to their superior photoluminescence quantum yield (PLQY), narrow emission bandwidth, and size‐dependent emission tunability. However, their instability under high temperature, humidity, and light exposure limits their practical application. This study reports a highly stable siloxane‐encapsulated nanocrystal resin synthesized through sol‐gel condensation. This encapsulated resin is highly adaptable to full‐color converting layers in displa

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28

Hsu, Ying-Fang, Chi-Yu Chuang, and Shinhao Yang. "Evaluation of the Bioaerosol Inactivation Ability of Chitosan-Coated Antimicrobial Filters." International Journal of Environmental Research and Public Health 18, no. 13 (2021): 7183. http://dx.doi.org/10.3390/ijerph18137183.

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This work considers the enhancement of indoor bioaerosol removal efficiency by liquid coating of the antimicrobial agent chitosan onto polypropylene fibrous filters (CCFs). Escherichia coli (E. coli) and Bacillus subtilis (B. subtilis) were chosen as the tested bioaerosols. The results revealed that 2.5% (w/w) of CCFs have significantly higher bioaerosol survival capability (23% and 34% of E. coli and B. subtilis, respectively), compared to an untreated filter (65% and 64% for E. coli and B. subtilis, respectively). Increasing face velocity and relative humidity during operating CCFs could red

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29

Pavlichenko, Ida, Armin T. Exner, Gennady Logvenov, Giuseppe Scarpa, Paolo Lugli, and Bettina V. Lotsch. "Nanomorphology tuning of the thermal response of TiO2/SiO2 Bragg stacks." Canadian Journal of Chemistry 90, no. 12 (2012): 1069–77. http://dx.doi.org/10.1139/v2012-081.

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Herein, we present a comparative study of thermo- and environmentally responsive TiO2/SiO2 one-dimensional photonic crystals (Bragg stacks) fabricated by different deposition methods and fabrication schemes, featuring various multilayer nanomorphologies. These include dense multilayer systems processed by physical vapor deposition and wet-chemistry protocols, as well as porous systems, namely, nanoparticle-based optical filters exhibiting textural porosity, and evaporation-induced self-assembled mesoporous Bragg stacks exhibiting predominantly structural porosity, as well as hybrid structures

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30

Weber, Ines C., Chang-ting Wang, and Andreas T. Güntner. "Room-Temperature Catalyst Enables Selective Acetone Sensing." Materials 14, no. 8 (2021): 1839. http://dx.doi.org/10.3390/ma14081839.

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Catalytic packed bed filters ahead of gas sensors can drastically improve their selectivity, a key challenge in medical, food and environmental applications. Yet, such filters require high operation temperatures (usually some hundreds °C) impeding their integration into low-power (e.g., battery-driven) devices. Here, we reveal room-temperature catalytic filters that facilitate highly selective acetone sensing, a breath marker for body fat burn monitoring. Varying the Pt content between 0–10 mol% during flame spray pyrolysis resulted in Al2O3 nanoparticles decorated with Pt/PtOx clusters with p

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31

Ukagwu, Kelechi John, Azando Isaac Enzoionzi, Val Hyginus Udoka Eze, Chikadibia Kalu Awa Uche, and Faith Ukagwu. "Innovative Design and Implementation of Portable and Rechargeable Air Purifier and Humidifier." International Journal of Recent Technology and Applied Science (IJORTAS) 6, no. 1 (2024): 14–24. http://dx.doi.org/10.36079/lamintang.ijortas-0601.618.

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This study presents the innovative design and successful implementation of a Portable and Rechargeable Air Purifier and Humidifier (PRAPH) aimed at addressing indoor air quality issues in Uganda. The device combines air purification and humidification functionalities into a compact, user-friendly, and energy-efficient unit. The design phase of the PRA-PH involved a thorough analysis of existing air purifiers and humidifiers, identifying key limitations such as limited portability, energy inefficiency, and complex maintenance requirements. The system incorporates high-efficiency particulate air

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32

Schwarz, Almuth D., Julian Dutzi, Patrick Weber, et al. "Humidity Considerations in Filter Testing Based on Analysis of Filters from Gas Turbine Applications." Chemical Engineering & Technology 45, no. 1 (2021): 43–50. http://dx.doi.org/10.1002/ceat.202100344.

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Montgomery, James F., Sheldon I. Green, and Steven N. Rogak. "Impact of Relative Humidity on HVAC Filters Loaded with Hygroscopic and Non-Hygroscopic Particles." Aerosol Science and Technology 49, no. 5 (2015): 322–31. http://dx.doi.org/10.1080/02786826.2015.1026433.

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Godoy, Charlotte, and Dominique Thomas. "Influence of relative humidity on HEPA filters during and after loading with soot particles." Aerosol Science and Technology 54, no. 7 (2020): 790–801. http://dx.doi.org/10.1080/02786826.2020.1726278.

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35

Muzafarov, Shavkat, Vladlen Balitsky, Aziz Babayev, et al. "Influence of temperature and humidity of the air on discharge processes in electric filters." E3S Web of Conferences 563 (2024): 01019. http://dx.doi.org/10.1051/e3sconf/202456301019.

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The article presents the results of an analysis of data sources of information on the use of electric fields in the processes of air purification from small dust particles (aerosols), and it is found that when developing existing devices for air purification from aerosol particles, the influence of the parameters of the purified air on the operation of electric precipitators was not taken into account. There is also no unified methodology for determining the parameters of electric precipitators, which is confirmed by the significant difference in the geometric and energy parameters of the deve

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36

Kendler, Shai, and Asaf Zuck. "The Challenges of Prolonged Gas Sensing in the Modern Urban Environment." Sensors 20, no. 18 (2020): 5189. http://dx.doi.org/10.3390/s20185189.

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The increase in the urban population is impacting the environment in several ways, including air pollution due to emissions from automobiles and industry. The reduction of air pollution requires reliable and detailed information regarding air pollution levels. Broad deployment of sensors can provide such information that, in turn, can be used for the establishment of mitigating and regulating acts. However, a prerequisite of such a deployment strategy is using highly durable sensors. The sensors must be able to operate for long periods of time under severe conditions such as high humidity, sol

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Henne, Stephan, Wolfgang Junkermann, Josiah M. Kariuki, John Aseyo, and Jörg Klausen. "Mount Kenya Global Atmosphere Watch Station (MKN): Installation and Meteorological Characterization." Journal of Applied Meteorology and Climatology 47, no. 11 (2008): 2946–62. http://dx.doi.org/10.1175/2008jamc1834.1.

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Abstract The meteorological conditions at the Mount Kenya (station identifier MKN) tropical Global Atmosphere Watch Programme station are described. Like other stations in mountainous terrain, the site experiences thermally induced wind systems that disturb free tropospheric conditions. Therefore, the adequacy of the site for long-term background atmospheric composition measurements needs to be evaluated. Meteorological parameters for the period June 2002–June 2006 were analyzed, focusing on the development of thermally induced wind systems and boundary layer influence. Filters based on the lo

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38

Düsing, Sebastian, Birgit Wehner, Thomas Müller, Almond Stöcker, and Alfred Wiedensohler. "The effect of rapid relative humidity changes on fast filter-based aerosol-particle light-absorption measurements: uncertainties and correction schemes." Atmospheric Measurement Techniques 12, no. 11 (2019): 5879–95. http://dx.doi.org/10.5194/amt-12-5879-2019.

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Abstract. Measuring vertical profiles of the particle light-absorption coefficient by using absorption photometers may face the challenge of fast changes in relative humidity (RH). These absorption photometers determine the particle light-absorption coefficient due to a change in light attenuation through a particle-loaded filter. The filter material, however, takes up or releases water with changing relative humidity (RH in %), thus influencing the light attenuation. A sophisticated set of laboratory experiments was therefore conducted to investigate the effect of fast RH changes (dRH ∕ dt) o

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39

Walter, Stefanie, Peter Schwanzer, Gunter Hagen, Hans-Peter Rabl, Markus Dietrich, and Ralf Moos. "Soot Monitoring of Gasoline Particulate Filters Using a Radio-Frequency-Based Sensor." Sensors 23, no. 18 (2023): 7861. http://dx.doi.org/10.3390/s23187861.

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Owing to increasingly stringent emission limits, particulate filters have become mandatory for gasoline-engine vehicles. Monitoring their soot loading is necessary for error-free operation. The state-of-the-art differential pressure sensors suffer from inaccuracies due to small amounts of stored soot combined with exhaust gas conditions that lead to partial regeneration. As an alternative approach, radio-frequency-based (RF) sensors can accurately measure the soot loading, even under these conditions, by detecting soot through its dielectric properties. However, they face a different challenge

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40

Zhao, Wei, Kelimu Tulugan, Xin Zhang, Xiang Li, and Peng Tian. "Electrospun 3D Curly Electret Nanofiber Air Filters for Particulate Pollutants." Sustainability 16, no. 7 (2024): 2808. http://dx.doi.org/10.3390/su16072808.

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Amidst rapid industrialization and urbanization, air pollution has emerged as a global environmental challenge. Traditional air filtration materials face challenges in effectively filtering PM0.3 and often result in discomfort due to high air resistance when used for personal protection, as well as excessive energy consumption in industrial air purification applications. This study initially utilized extremely high environmental humidity to induce fiber formation, resulting in the preparation of a fluffy fiber membrane with a three-dimensional curly morphology, which increased the porosity to

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Ediagbonya, T.F., E.E. Ukpebor, F.E. Okieimen, and V. O. Akpojivi. "Selected Trace Metals Analysis of Total Suspended particulate Matter in Rural Areas in Edo state, Nigeria." Greener Journal of Environmental Management and Public Safety 2, no. 2 (2013): 91–98. https://doi.org/10.15580/gjemps.2013.2.120212310.

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Particulate matter was captured from five different sites using SKC Air Check gravimetric sampler Model 21-5000 serial no 20537 and a glass fibre filter between the months of December 2008 and April 2009. The glass fibre filters were analysed for nine trace metals – Fe, Cu, Zn, Cd, Mn, Pd, Ni, Cr and Co (by Atomic Absorption spectrophotometric (AAS). The data obtained were subjected to factor analysis. Enrichment factors of various elements relative to crustal abundance for the air filters indicate that input of the majority of elements is due to crustal resuspended soil induced by wind

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MOYER, ERNEST S., and GREGORY A. STEVENS. "“Worst Case” Aerosol Testing Parameters: II. Efficiency Dependence of Commercial Respirator Filters on Humidity Pretreatment." American Industrial Hygiene Association Journal 50, no. 5 (1989): 265–70. http://dx.doi.org/10.1080/15298668991374624.

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Moyer, Ernest S., and Gregory A. Stevens. "“Worst Case” Aerosol Testing Parameters: II. Efficiency Dependence of Commercial Respirator Filters on Humidity Pretreatment." AIHAJ 50, no. 5 (1989): 265–70. http://dx.doi.org/10.1202/0002-8894(1989)050<0265:catpie>2.0.co;2.

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Gayo, E., and J. de Frutos. "Interference filters as an enhancement tool for infrared thermography in humidity studies of building elements." Infrared Physics & Technology 38, no. 4 (1997): 251–58. http://dx.doi.org/10.1016/s1350-4495(97)00025-x.

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Henneken, Hartmut, Martin Vogel, and Uwe Karst. "Effects of humidity and filter material on diffusive sampling of isocyanates using reagent-coated filters." Journal of Environmental Monitoring 8, no. 10 (2006): 1014. http://dx.doi.org/10.1039/b607658k.

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Tang, W., T. H. Kuehn, and Matt F. Simcik. "Effects of Temperature, Humidity and Air Flow on Fungal Growth Rate on Loaded Ventilation Filters." Journal of Occupational and Environmental Hygiene 12, no. 8 (2015): 525–37. http://dx.doi.org/10.1080/15459624.2015.1019076.

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Joubert, A., J. C. Laborde, L. Bouilloux, S. Chazelet, and D. Thomas. "Modelling the pressure drop across HEPA filters during cake filtration in the presence of humidity." Chemical Engineering Journal 166, no. 2 (2011): 616–23. http://dx.doi.org/10.1016/j.cej.2010.11.033.

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Xu, Bin, Ya Wu, Zhongping Lin, and Zhiqing Chen. "Investigation of Air Humidity Affecting Filtration Efficiency and Pressure Drop of Vehicle Cabin Air Filters." Aerosol and Air Quality Research 14, no. 3 (2014): 1066–73. http://dx.doi.org/10.4209/aaqr.2013.06.0204.

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Sattenhwaite, Andrew. "The Better Bathroom: A Spiritual and Political Landscape." UnderCurrents: Journal of Critical Environmental Studies 3 (April 1, 1991): 19–25. http://dx.doi.org/10.25071/2292-4736/37926.

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Imagine this scene: luxuriant broadleaf greenery, ferns and verdant mosses. Perhaps a rock or two poking through. A pool, perhaps with clear water, but obviously deep, and a waterfall, flashing and tumbling, soothing to the ear, and lending the air a tangible humidity. Filtered sunlight dapples the waters.

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Nunes, Deivid Marques, João Jorge Ribeiro Damasceno, and Fábio de Oliveira Arouca. "Analysis of the Collection Efficiency of Fiber Filters on the Filtration of Nano-Sized Particles from Aerosol." Materials Science Forum 802 (December 2014): 297–302. http://dx.doi.org/10.4028/www.scientific.net/msf.802.297.

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Several studies on removal of nanosized particles are being developed with the aim of minimizing the adverse effects nanoaerosols can cause to the environment and human health due to poor air quality. Moreover, scientific and technological studies have developed in the application of nanosized particles. In academy and industry there are many mechanisms to remove nanoparticles from aerosols, such as fiber filters. Thus, this study aims to analyze the performance of fibrous filters, such as polyester filters (porosity is 0.82 and thickness is 2.2 mm and fiber mean diameter of 26 μm. A nanoparti

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