Literatura académica sobre el tema "Capteur PM"
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Artículos de revistas sobre el tema "Capteur PM"
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Zhang, Weikang, Zhi Zhang, Huan Meng y Tong Zhang. "How Does Leaf Surface Micromorphology of Different Trees Impact Their Ability to Capture Particulate Matter?" Forests 9, n.º 11 (30 de octubre de 2018): 681. http://dx.doi.org/10.3390/f9110681.
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Particulate matter (PM), including PM10 and PM2.5, has a major impact on air quality and public health. It has been shown that trees can capture PM and improve air quality. In this study, we used two-way ANOVA to investigate the significance of micro-morphological leaf surface characteristics of green trees in capturing PM at different parks in Beijing. The results show that leaf structure significantly impacts the ability of plants to capture PM. Pinus tabuliformis Carr. and Pinus bungeana Zucc. were mainly impacted by the density of stomata, waxy cuticle, and epidermis, while the major contributor to PM retention in other test trees, including Acer truncatum Bunge, Salix matsudana Koid., Populus tomentosa Carr. and Ginkgo biloba Linn. was leaf roughness. There were significant variations in leaf-droplet contact angle (representative of leaf wettability) and the ability of trees to capture PM (p < 0.05): the bigger the contact angle, the less able the plant was to capture particulate matter.
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Sillars-Powell, Lory, Matthew J. Tallis y Mike Fowler. "Road Verge Vegetation and the Capture of Particulate Matter Air Pollution". Environments 7, n.º 10 (20 de octubre de 2020): 93. http://dx.doi.org/10.3390/environments7100093.
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Urban air quality is considered a major issue in cities worldwide, with particulate matter (PM) recognised as one of the most harmful pollutants regarding human health. The use of plants to act as air filters and immobilise PM has been identified as a potential method to improve the air quality in these areas. The majority of the work has focused on trees, with the application of shrub and herbaceous species largely overlooked. Two contrasting leaf morphologies from a shrub and herbaceous plant species were sampled at four locations across Southampton (UK), from varying traffic conditions. Samples were analysed for the mass of PM captured, particle size, and elemental composition. These analyses were used to characterise the different sites and the plants’ effectiveness at immobilisation of PM. Captured PM mass was shown to be directly related to traffic density, with greater traffic density leading to higher levels of captured PM. PM origins were attributed to emissions from vehicles and the resuspension of particles by vehicle movement. The bulk of the PM mass was shown to originate from natural, crustal sources including large proportions of Al, Si, and/or Ca. Increases in elements from anthropogenic enhancement (such as Fe and Zn) were related to high traffic density. Particle size analysis identified that, despite the use of standard leaf-washing protocols with a final 2.5 µm filter, PM was dominated by fine particles (<2.5 µm physical diameter), with particles >10 µm rare. Bramble leaves were calculated to have a species-specific deposition velocity 0.51 cm s−1 greater than ivy, with deposition velocities calculated at 1.8 and 1.3 cm s−1 for ivy and 2.3 and 1.8 cm s−1 for bramble at Redbridge Road and Brinton’s Road, respectively. These values can allow for the more accurate modelling and estimation of the PM removal abilities of these plants.
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Li, Yanmei, Shaojun Wang y Qibo Chen. "Potential of Thirteen Urban Greening Plants to Capture Particulate Matter on Leaf Surfaces across Three Levels of Ambient Atmospheric Pollution". International Journal of Environmental Research and Public Health 16, n.º 3 (31 de enero de 2019): 402. http://dx.doi.org/10.3390/ijerph16030402.
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The potential of urban greening plants to capture particulate matter (PM) from the ambient atmosphere is contingent on interactions between the level of pollution and leaf surfaces. For this study, thirteen plant species were investigated to quantify their capacity of PM accumulation under three atmospheric environments, that is, industrial, traffic and university campus (control), in Kunming City (Southwest China). The sampled sites represented different pollution levels (that is, high pollution, slight pollution and clean air, respectively). The plant species differed in their accumulation of PM by six- to eight-fold across the three sites. Magnolia grandiflora was the most efficient evergreen tree species, whereas Platanus acerifolia had the highest capture of PM among deciduous trees. The accumulation capacity of the same species varied with the degree of pollution. For example, Osmanthus fragrans, Loropetalum chinense and Cinnamomum japonicum were highly efficient for the capture of PM in the traffic and university campus areas; however, they exhibited medium accumulation in the industrial area. Prunus majestica demonstrated an intermediate accumulation capacity in the industrial area, but was low in the traffic and university campus areas. The capturing capacity of the same genus was also different among the different levels of pollution. For example, C. japonicum had a 2.9–4.2-times higher PM accumulation than did C. camphora across the three sites. There were significant differences in leaf surface area, stomata density/length, guard cell area, and trichome density/length among these species. The species-specific efficacy of PM capture was primarily contributed to by leaf size and surface roughness, stomata density, and trichome length. In particular, hairy-leaf leaves with medium stomatal density exhibited higher PM capture. Therefore, leaf micromorphology, leaf size and longevity appeared to be significant predictive factors for the accumulation of PM, which may aid in the selection of greening plant species for the remediation of pollutants in urban areas.
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Bui, Huong-Thi, Na-Ra Jeong y Bong-Ju Park. "Seasonal Variations of Particulate Matter Capture and the Air Pollution Tolerance Index of Five Roadside Plant Species". Atmosphere 14, n.º 1 (8 de enero de 2023): 138. http://dx.doi.org/10.3390/atmos14010138.
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Particulate matter (PM) is the most dangerous type of air pollutant and is harmful to human health. Plants can be used as a biofilter to remove PM from the atmosphere and improve air quality. In this study, we used the air pollution tolerance index and four leaf traits of five different plant species commonly used in landscaping in Korea to determine which plants are best suited to remove PM from the atmosphere in roadside areas in spring, summer, and autumn. We found that the PM concentrations in the atmosphere impacted the amount of PM accumulated in the plants, with increased PM accumulation during periods of increased environmental PM levels on the roadside. Euonymus japonicus, and Euonymus alatus accumulated the highest amount of PM and had the highest tolerance levels to air pollution. Thus, these species could be suitable for use in areas with high PM concentrations to improve air quality. We also found that shrubs were more effective in accumulating PM than trees and recommend that shrubs and trees be used together to further increase the amount of PM removed from the atmosphere in urban areas.
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Popek, Robert, Anamika Roy, Mamun Mandal, Arkadiusz Przybysz, Katarzyna Drążkiewicz, Patrycja Romanowska y Abhijit Sarkar. "Enhancing Urban Sustainability: How Spatial and Height Variability of Roadside Plants Improves Pollution Capture for Greener Cities". Sustainability 16, n.º 24 (19 de diciembre de 2024): 11131. https://doi.org/10.3390/su162411131.
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Air pollution, particularly particulate matter (PM), poses a significant threat to urban environments and public health. This study aims to explore the impact of small-scale spatial and height variations on the ability of different roadside tree species: Tilia cordata Mill., Platanus × hispanica Mill. ex Münchh., and Sorbus intermedia (Ehrh.) Pers., to accumulate PM, providing insights for enhancing urban sustainability. Conducted along a high-traffic road in Warsaw, Poland, the research examines PM accumulation at varying heights and locations within tree canopies while also evaluating the influence of PM on photosynthetic efficiency. Results indicate substantial differences in PM accumulation between tree species and height ranges, with S. intermedia accumulating the highest PM levels. PM accumulation was greatest near the roadside and at lower canopy heights (1–1.5 m), while higher canopies and areas distant from the road showed reduced PM concentrations. T. cordata exhibited the highest PM accumulation on the side facing traffic, averaging 12% at 1–1.5 m height, while the interior recorded 5% at 2–2.5 m height. In S. intermedia, the roadside crown contributed the highest accumulation (14%) at 1–1.5 m height and only 6% on the side facing departing traffic at 2–2.5 m height. P. hispanica displayed higher efficiency in PM accumulation, reaching 11% at the roadside (1–1.5 m) and 7% at the top of the crown (3–3.5 m). Additionally, PM accumulation negatively impacted photosynthetic efficiency and chlorophyll content, with the highest PM levels correlating with reduced plant vitality. PCA analysis showed a stronger association between leaf-deposited PM and total chlorophyll content and that the presence of accumulated PM may significantly influence the chlorophyll content of the plants. These findings provide valuable guidance for urban planners in strategically planting roadside vegetation to maximize air quality improvement, offering a cost-effective and sustainable approach to mitigate urban pollution.
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Zhu, Yuanqing, Qiqi Wan, Qichen Hou, Yongming Feng, Jia Yu, Jie Shi y Chong Xia. "Analysis of Diffusion Characteristics and Influencing Factors of Particulate Matter in Ship Exhaust Plume in Arctic Environment Based on CFD". Atmosphere 15, n.º 5 (9 de mayo de 2024): 580. http://dx.doi.org/10.3390/atmos15050580.
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The gradual opening of the Arctic shipping route has made navigation possible. However, the harm caused by ship exhaust emissions is increasingly severe. Therefore, it is necessary to study the diffusion characteristics of ship exhaust plumes during Arctic navigation. The study focuses on a merchant vessel as the subject of investigation, employing computational fluid dynamics (CFD) simulation techniques to analyze the diffusion characteristics of particulate matter (PM) within ship exhaust plumes under Arctic environmental conditions. The diffusion law of ship exhaust plume PM is clarified, and the influence of three factors, synthetic wind speed, yaw angle and chimney angle, on the PM diffusion is analyzed. It was found that after the PM was discharged from the chimney, the majority of the PM dispersed directly backward along with the external flow field, while a minor fraction lingered at the stern of the ship for an extended period before eventually diffusing backward. Among them, 1235 particles were captured within a range of 200 m from the stern, with a capture rate of 0.6%. When the synthetic wind shows a yaw angle, the capture rate of PM in the interval increases rapidly with the increase of yaw angle, while other factors have less influence on the capture rate of PM. This study provides foundational guidance for predicting PM diffusion from ship exhaust plumes in Arctic environments, thereby enabling more effective strategies for managing such emissions.
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Huong-Thi, Bui, Moonsun Jeong y Bong-Ju Park. "Particulate Matter Capture and Air Pollution Tolerance of Six Roadside Plants in Cheongju, South Korea". Journal of Environmental Science and Management 27, n.º 1 (30 de junio de 2024): 1–10. http://dx.doi.org/10.47125/jesam/2024_1/01.
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Particulate matter (PM), a highly hazardous air pollutant with known adverse health effects, has been proven to be effectively mitigated by using plants. This study aimed to evaluate the capacity of various plants in capturing PM and their tolerance to air pollution. This will facilitate the selection of suitable species for roadside planting. Accordingly, this research quantified the accumulation of particulate matter in six different plant species. Four biochemical parameters [total chlorophyll, leaf pH extract, relative water content, and ascorbic acid] were evaluated to determine the Air Pollution Tolerance Index (APTI), PM accumulation results varied among the plant species. The tolerance level was categorized into four groups: tolerant, moderately tolerant, intermediate, and sensitive. Ligustrum obtusifolium demonstrated the highest PM accumulation and tolerance index values. The presence of leaf hair and roughness on leaf surfaces was observed to facilitate higher PM accumulation in certain plants. PM accumulation on leaves was significantly correlated with biochemical parameters and APTI of plants. Based on these outcomes, Ligustrum obtusifolium, Hibiscus syriacus, and Chamaecyparis obtusa were identified as suitable for roadside planting to mitigate atmospheric particulate matter.
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刘, 栩同. "Data Capture and Visualization Analysis Based on R Language". Pure Mathematics 13, n.º 06 (2023): 1601–9. http://dx.doi.org/10.12677/pm.2023.136163.
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Afdila, Alita Nur, M. Kanedi, Nismah Nukmal y Sutyarso Sutyarso. "The Diversity of Grasshoppers in Liwa Botanical Garden Based on Time Capture". Jurnal Ilmiah Biologi Eksperimen dan Keanekaragaman Hayati 7, n.º 1 (1 de abril de 2020): 18–24. http://dx.doi.org/10.23960/jbekh.v7i1.8.
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Grasshopper is one of the diurnal cosmopolitan insect, the existence of grasshoppers is very influential for some other animal populations such as birds. It is still lack of information of diversity, distribution, population, and other basic biological aspects of grasshoppers at Kebun Raya Liwa (KRL). To monitor biodiversity, it is necessary to provide informations about the number of individuals, their functions, and roles in the habitat and ecosystem. Therefore it is necessary to conduct the research of these topics. This research was carried out during November to December 2019, at the Taman Hias Kebun Raya Liwa. Grasshoppers were cached in the morning from 06.00 AM to 09.00 AM, day from 10.00 AM to 02.00 PM, and afternoon from 03.00 PM to 06.00 PM . The grasshoppers was cached using a sweeping net by exploring the Taman Hias Kebun Raya Liwa. The caught grasshopper was identified at the Zoology Laboratory of the Faculty of Mathematics and Natural Sciences, Universitas Lampung. The result show that ten species of grasshopper were found at the Taman Hias Kebun Raya Liwa, i.e. Phaleoba antennata, Phaleoba fumosa, Phaleoba rustica, Atractomorpha crenulata, Atractomorpha sp., Phillium crurifolium, Phillium sp, Trilophidia annulata, Oxya chienensis, and Melanoplus differentialentialis. The index diversity of grasshopper at the Taman Hias Kebun Raya Liwa is categorized to moderate with H' = 2.223. The best time to catch grasshoppers is in the morning from 06.00 AM-09.00 AM and afternoon from 03:00 PM – 05:00 PM.
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Wu, Zhengguang, Yanjuan Qi, Aihong Kang, Bo Li y Xueling Xu. "Evaluation of Particulate Matter Capture and Long-Term Clogging Characteristics of Different Filter Media for Pavement Runoff Treatment". Advances in Materials Science and Engineering 2020 (27 de agosto de 2020): 1–15. http://dx.doi.org/10.1155/2020/5012903.
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The removal of particulate matter (PM) by filter media during filtration process can mitigate the pavement runoff pollution effectively. However, this process also makes the filter media prone to clogging. To better understand the size ranges of PM captured by filter media and the subsequent impact on the clogging process, filtration test and clogging test were conducted on five types of filter media. The effect of layer thickness and grain size of different filter media on particle removal efficiency was evaluated, based on the results of PM removal rate and the particle size distribution. The subsequent long-term clogging characteristics of different filter media were also investigated. The results showed that filter media presented different capabilities to capture PM, which could be enhanced by less layer thickness or finer grain size. Normally, PM with the size range of over 49 μm could be captured effectively if proper layer thickness and grain size of filter media were selected. Besides, PM removal rate was not related to the clogging resistance of filter media. Though it can capture a larger amount of PM, Vesuvianite still maintained remarkable clogging resistance. The results will be beneficial to filter media selection and system design optimization for pavement runoff treatment.
Tesis sobre el tema "Capteur PM"
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Grondin, Didier. "Développement d'un capteur de suies pour application automobile - Etude des paramètres clés affectant sa réponse". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEM012/document.
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Le transport routier est responsable d’une part des émissions de particules fines, notamment dans les grandes agglomérations. Celles-ci ayant des répercussions graves sur la santé humaine et l’environnement, des normes d’émissions des véhicules de plus en plus strictes sont mises en place. Des limites en nombre de particules sont imposées et une obligation de connaitre l’état de santé des organes de post-traitement des gaz d’échappement est également entrée en vigueur (On-Board Diagnostic : OBD).Les capteurs résistifs ont montré de bons résultats pour la mesure de la concentration massique des particules et ont l’avantage d’être simples à mettre en oeuvre, robustes et peu onéreux. Le principe de fonctionnement du capteur est basé sur la mesure de la conductance entre des électrodes de platine. Celle-ci augmente avec le dépôt de suies.L’objectif de ce travail de thèse est de parvenir à déterminer les paramètres clés qui affectent la réponse du capteur. Trois flux de suies présentant des distributions en taille différentes ont été sélectionnés et caractérisés. Un quatrième flux de suies a permis d’appréhender l’impact d’une concentration massique inférieure. La réponse du capteur à ces différents flux de suies a été étudiée. Nous avons montré que la sensibilité et le temps de réponse du capteur sont optimaux pour une tension de polarisation donnée entre les deux électrodes dont la valeur dépend de la distribution en taille des suies. Ce phénomène a été expliqué par les propriétés électriques différentes des suies et modélisé par un équilibre entre accumulation et combustion par effet Joule des suies déposées permettant de simuler la réponse temporelle du capteurRoad transport contributes to a part of the particulate matter emissions, especially in big cities. Due to the negative effect of these pollutants on the human health and environment, more and more stringent emission standards for automotive are applied. These emissions are now limited in number of particles per kilometer and the vehicle need to indicate when there is some failure of the systems of depollution (OBD: On-Board diagnostic).Resistive sensors have shown good results to measure soot particles mass concentration. They have advantage of being a simple and robust technology that can be easily manufactured at a cheap price. The sensor principle consists of conductance measurement between two platinum electrodes. Conductance increases with soot deposition. This work aims to define the key parameters that affect the sensors response. Three particles flow with different particles size distributions (centered at 90, 70 and 50 nm) were used and characterized. A fourth flow was used to see the impact of a lower mass concentration. The sensor response exposed to these different flows was studied. It was shown that the sensor sensibility and response times are optimal for a given polarization voltage between the electrodes whose value depends on the size distribution. This phenomenon was explained by the different electrical properties of the soot particles and modeled by equilibrium of soot accumulation and their combustion by Joule heating that permitting to simulate the sensor temporal response
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Chander, Bhan Chander Bhan. "Photonics-based environmental sensors for automotive air quality monitoring". Electronic Thesis or Diss., Lyon, INSA, 2024. http://www.theses.fr/2024ISAL0120.
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Cette thèse explore les dispositifs de circuits photoniques intégrés (PIC) basés sur une plateforme en nitrure de silicium (SiN), en mettant l'accent sur leur potentiel pour la détection de particules dans l'air, un élément clé des capteurs de l'indice de qualité de l'air (AQI). La haute sensibilité volumique des résonateurs à anneaux (MRR) dans ces dispositifs permet la détection de faibles concentrations de particules, tandis que les forces optiques permettent le piégeage spécifique à la taille des particules. Pour relever les défis liés au piégeage de particules diélectriques de moins de 100 nm, cette recherche explore diverses structures photoniques, y compris des guides d'onde diélectriques, des résonateurs en mode d'ordre supérieur (HOM) et des guides d'onde plasmoniques hybrides. cette étude comprend leur conception, leur fabrication et leur compatibilité avec des plateformes industrielles telles que DAPHNE de STMicroelectronics. L'analyse des forces optiques, réalisée à l'aide de méthodes telles que le tenseur de contrainte de Maxwell (MST) et l'approximation de dipôle discret (DDA), fournit un cadre rigoureux pour optimiser la conception et évaluer différentes structures. Les résultats soulignent le potentiel des guides d'ondes HOM et des guides d'ondes plasmoniques hybrides pour le piégeage optique avancé et la détection de l'IQA, ouvrant ainsi la voie à des approches innovantes pour les applications de surveillance de l'environnementThis thesis explores photonic integrated circuit (PIC) devices based on a silicon nitride (SiN) platform, focusing on their potential for airborne particle detection, a key component of air quality index (AQI) sensors. The bulk sensitivity of the ring resonators (MRR) in these devices enables detection of low particle concentrations, while the optical forces enable size-specific trapping of particles. To address the challenges of trapping dielectric particles smaller than 100 nm, this research explores various photonic structures, including dielectric waveguides, higher-order mode (HOM) resonators and hybrid plasmonic waveguides. The study includes their design, fabrication and compatibility with industrial platforms such as STMicroelectronics' DAPHNE. Optical force analysis, using methods such as Maxwell's stress tensor (MST) and discrete dipole approximation (DDA), provides a rigorous framework for optimizing the design and evaluating different structures.The findings underscore the potential of HOM waveguides and hybrid plasmonic waveguides for advanced optical trapping and AQI sensing, paving the way for innovative approaches to environmental monitoring applications
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Languille, Baptiste. "Caractérisation des variabilités temporelle et spatiale de la pollution en Île-de-France : De la mesure de l'exposition individuelle à la définition des sources". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLV071/document.
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La pollution atmosphérique résulte d’un mélange complexe de composés, des gaz et des particules, dont les effets sont notoirement néfastes. Les composés organiques volatils (COV) tiennent un rôle prépondérant dans la chimie atmosphérique et sont précurseurs d’ozone et d’aérosols organiques secondaires (AOS). En Île-de-France, l’exposition à la pollution est préoccupante ; or, des incertitudes significatives sont toujours associées aux sources de polluants, ainsi qu’à leur intensité et leurs variabilités à différentes échelles de temps et très peu d’investigations ont porté sur la quantification de l’exposition individuelle. Dans ce contexte, cette thèse a cherché à mieux caractériser les variabilités temporelle et spatiale de la pollution en Île-de-France.La fiabilité discutable des capteurs portables a été dépassée par l’élaboration d’un protocole de sélection et de qualification comprenant différents tests en mesures fixes, en chambre et en mobilité. Cette nouvelle méthodologie, basée notamment sur l’utilisation d’un outil combinant différents indicateurs statistiques, a été appliquée pour retenir l’AE51, le Cairclip et le Canarin, mesurant respectivement le carbone suie (BC), le dioxyde d’azote (NO2) et les particules (PM).Ces trois capteurs ont été déployés au cours de campagnes de mesures impliquant une trentaine de volontaires. L’exposition individuelle ainsi quantifiée est plus élevée à l’automne qu’au printemps et varie de manière substantielle en fonction des différents environnements fréquentés. La proximité de la circulation routière (pour le BC et le NO2) ainsi que les activités de cuisine et la fumée de tabac (pour les PM) présentent des contributions importantes à l’exposition totale (jusqu’à 34 %, 26 % et 44 % respectivement), alors même que le temps passé dans ces environnements est faible.En plus du trafic routier, le BC est traditionnellement imputé au feu de bois. Une campagne hivernale de mesures (3,5 mois) a permis d’imputer respectivement 22 % et 47 % des COV mesurés à ces deux sources. Certains composés ont été mesurés et associés au feu de bois pour la première fois en air ambiant comme le benzènediol et le méthylbutènone. Une comparaison avec l’inventaire régional des émissions a permis d’identifier des similitudes et des différences pour proposer des améliorationsAir pollution results from a complex mixture of compounds, gases and particulate matter, whose effects have proven to be harmful. Volatile organic compounds (VOCs) play a major role in atmospheric chemistry and are precursors of ozone and secondary organic aerosols (SOAs). In Île-de-France, exposure to pollution is a concern; however, significant uncertainties are still associated with the pollutants’ sources, as well as their intensity and variability at different time scales, and very few investigations have focused on quantifying personal exposure. In this context, this research sought to better characterize the temporal and spatial variabilities of pollution in Île-de-France.The questionable reliability of portable sensors has been addressed by the design of a selection and qualification protocol including various tests in static measurements, controlled chamber and mobility. This new methodology, based in particular on the use of a tool combining different statistical indicators, was applied to choose the AE51, Cairclip and Canarin, measuring black carbon (BC), nitrogen dioxide (NO2) and particulate matter (PM) respectively.These three sensors were deployed during measurement campaigns involving about thirty volunteers. The personal exposure thus quantified is higher in fall than in spring and varies substantially according to the different environments frequented. Proximity to road traffic (for BC and NO2) as well as cooking activities and tobacco smoke (for PM) make significant contributions to total exposure (up to 34 %, 26 % and 44 % respectively), even though the time spent in these environments is short.In addition to road traffic, BC is traditionally attributed to wood burning. A winter measurement campaign (3.5 months) attributed respectively 22 % and 47 % of the measured VOCs to these two sources. Compounds including benzenediol and methylbuteone were measured and associated with wood burning for the first time in ambient air. A comparison with the regional emissions inventory identified similarities as well as differences and suggested improvements
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Et, Taouil Abdeslam. "Effets des ultrasons haute fréquence sur l'électrosynthèse des polymères conducteurs". Phd thesis, Université de Franche-Comté, 2011. http://tel.archives-ouvertes.fr/tel-00839877.
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L'objectif de ces travaux est d'étudier les effets d'une irradiation ultrasonore haute fréquence (500 kHz) sur la synthèse électrochimique de polymères conducteurs en milieu aqueux. Les ultrasons favorisent la réaction de polymérisation électrochimique en augmentant le transport des espèces électroactives vers l'électrode. Ils engendrent des films plus compacts, présentant une topographie plus fine et plus homogène. Les effets chimiques engendrés par la propagation de l'onde acoustique permettent un meilleur taux de dopage des films. Néanmoins, leur conductivité électrique se trouve légèrement diminuée, dû à une dégradation des chaînes polymères par l'activité cavitationelle. La possibilité de contrôler les propriétés de morphologie fut mise à profit dans différentes applications comme celles des capteurs pH potentiométriques ou des revêtements anti-corrosion. Pour de telles applications, utilisant ces films en tant que couche fonctionnelle, les surfaces obtenues en présence d'irradiation ultrasonore mènent à de meilleurs résultats. Une technique de masquage sélectif à base d'ultrasons focalisés a également été développée afin d'élaborer un substrat biphasique laissant présager d'intéressantes applications biologiques
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Et, Taouil Abdeslam. "Effets des ultrasons haute fréquence sur l’électrosynthèse des polymères conducteurs". Thesis, Besançon, 2011. http://www.theses.fr/2011BESA2025/document.
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L’objectif de ces travaux est d’étudier les effets d’une irradiation ultrasonore haute fréquence (500 kHz) sur la synthèse électrochimique de polymères conducteurs en milieu aqueux. Les ultrasons favorisent la réaction de polymérisation électrochimique en augmentant le transport des espèces électroactives vers l’électrode. Ils engendrent des films plus compacts, présentant une topographie plus fine et plus homogène. Les effets chimiques engendrés par la propagation de l’onde acoustique permettent un meilleur taux de dopage des films. Néanmoins, leur conductivité électrique se trouve légèrement diminuée, dû à une dégradation des chaînes polymères par l’activité cavitationelle. La possibilité de contrôler les propriétés de morphologie fut mise à profit dans différentes applications comme celles des capteurs pH potentiométriques ou des revêtements anti-corrosion. Pour de telles applications, utilisant ces films en tant que couche fonctionnelle, les surfaces obtenues en présence d’irradiation ultrasonore mènent à de meilleurs résultats. Une technique de masquage sélectif à base d’ultrasons focalisés a également été développée afin d’élaborer un substrat biphasique laissant présager d’intéressantes applications biologiquesThis study deals with the effects of high frequency ultrasound (500 kHz) irradiation on the electrochemical synthesis of conducting polymers in aqueous media. Ultrasound favors electrochemical polymerization reaction by improving mass transfer of electroactive species towards the electrode. It leads to films more compact, presenting a thinner and more homogeneous topography. Chemical effects generated by the acoustic wave propagation enable a higher doping level for the films. However, their electrical conductivity is slightly reduced, due to partial degradation of polymer chains by cavitational activity. The possibility to control morphological properties was used in different applications such as potentiometric pH sensors or anti-corrosion coatings. For such applications, using these films as functional layers, the irradiated coatings lead to better results. A selective masking technique, based on focused ultrasound, has been developed as well in order to elaborate a biphased substrate permitting interesting biological applications
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Bharmal, Huzefa A. "Performance Evaluation of Wet Metal Plate Electrostatic Precipitator". Ohio University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1133462252.
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Languille, Baptiste. "Caractérisation des variabilités temporelle et spatiale de la pollution en Île-de-France : De la mesure de l'exposition individuelle à la définition des sources". Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLV071.
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La pollution atmosphérique résulte d’un mélange complexe de composés, des gaz et des particules, dont les effets sont notoirement néfastes. Les composés organiques volatils (COV) tiennent un rôle prépondérant dans la chimie atmosphérique et sont précurseurs d’ozone et d’aérosols organiques secondaires (AOS). En Île-de-France, l’exposition à la pollution est préoccupante ; or, des incertitudes significatives sont toujours associées aux sources de polluants, ainsi qu’à leur intensité et leurs variabilités à différentes échelles de temps et très peu d’investigations ont porté sur la quantification de l’exposition individuelle. Dans ce contexte, cette thèse a cherché à mieux caractériser les variabilités temporelle et spatiale de la pollution en Île-de-France.La fiabilité discutable des capteurs portables a été dépassée par l’élaboration d’un protocole de sélection et de qualification comprenant différents tests en mesures fixes, en chambre et en mobilité. Cette nouvelle méthodologie, basée notamment sur l’utilisation d’un outil combinant différents indicateurs statistiques, a été appliquée pour retenir l’AE51, le Cairclip et le Canarin, mesurant respectivement le carbone suie (BC), le dioxyde d’azote (NO2) et les particules (PM).Ces trois capteurs ont été déployés au cours de campagnes de mesures impliquant une trentaine de volontaires. L’exposition individuelle ainsi quantifiée est plus élevée à l’automne qu’au printemps et varie de manière substantielle en fonction des différents environnements fréquentés. La proximité de la circulation routière (pour le BC et le NO2) ainsi que les activités de cuisine et la fumée de tabac (pour les PM) présentent des contributions importantes à l’exposition totale (jusqu’à 34 %, 26 % et 44 % respectivement), alors même que le temps passé dans ces environnements est faible.En plus du trafic routier, le BC est traditionnellement imputé au feu de bois. Une campagne hivernale de mesures (3,5 mois) a permis d’imputer respectivement 22 % et 47 % des COV mesurés à ces deux sources. Certains composés ont été mesurés et associés au feu de bois pour la première fois en air ambiant comme le benzènediol et le méthylbutènone. Une comparaison avec l’inventaire régional des émissions a permis d’identifier des similitudes et des différences pour proposer des améliorationsAir pollution results from a complex mixture of compounds, gases and particulate matter, whose effects have proven to be harmful. Volatile organic compounds (VOCs) play a major role in atmospheric chemistry and are precursors of ozone and secondary organic aerosols (SOAs). In Île-de-France, exposure to pollution is a concern; however, significant uncertainties are still associated with the pollutants’ sources, as well as their intensity and variability at different time scales, and very few investigations have focused on quantifying personal exposure. In this context, this research sought to better characterize the temporal and spatial variabilities of pollution in Île-de-France.The questionable reliability of portable sensors has been addressed by the design of a selection and qualification protocol including various tests in static measurements, controlled chamber and mobility. This new methodology, based in particular on the use of a tool combining different statistical indicators, was applied to choose the AE51, Cairclip and Canarin, measuring black carbon (BC), nitrogen dioxide (NO2) and particulate matter (PM) respectively.These three sensors were deployed during measurement campaigns involving about thirty volunteers. The personal exposure thus quantified is higher in fall than in spring and varies substantially according to the different environments frequented. Proximity to road traffic (for BC and NO2) as well as cooking activities and tobacco smoke (for PM) make significant contributions to total exposure (up to 34 %, 26 % and 44 % respectively), even though the time spent in these environments is short.In addition to road traffic, BC is traditionally attributed to wood burning. A winter measurement campaign (3.5 months) attributed respectively 22 % and 47 % of the measured VOCs to these two sources. Compounds including benzenediol and methylbuteone were measured and associated with wood burning for the first time in ambient air. A comparison with the regional emissions inventory identified similarities as well as differences and suggested improvements
Libros sobre el tema "Capteur PM"
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Pulakos, Elaine D. y Mariangela Battista, eds. Performance Management Transformation. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190942878.001.0001.
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No other talent process has been the subject of such great debate and emotion as performance management (PM). For decades, different strategies have been tried to improve PM processes, yielding an endless cycle of reform to capture the next “flavor-of-the-day” PM trend. The past 5 years, however, have brought novel thinking that is different from past trends. Companies are reducing their formal processes, driving performance-based cultures, and embedding effective PM behavior into daily work rather than relying on annual reviews to drive these. Through case studies provided from leading organizations, this book illustrates the range of PM processes that companies are using today. These show a shift away from adopting someone else’s best practice; instead, companies are designing bespoke PM processes that fit their specific strategy, climate, and needs. Leading PM thought leaders offer their views about the state of PM today, what we have learned and where we need to focus future efforts, including provocative new research that shows what matters most in driving high performance. This book is a call to action for talent management professionals to go beyond traditional best practice and provide thought leadership in designing PM processes and systems that will enhance both individual and organizational performance.
Capítulos de libros sobre el tema "Capteur PM"
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Piedimonte, Paola. "Electronic Bio-Reconfigurable Impedance Platform for High Sensitivity Detection of Target Analytes". En Special Topics in Information Technology, 55–64. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-51500-2_5.
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AbstractThe present research presents a portable bioelectronic platform for multiplex detection to read biosensor chips with several sensing sites for real-time analyte capture. The technique is based on Differential Impedance Sensing (DIS) of the target through functionalized nanoparticle amplification. Gold-interdigitated microelectrodes are the core of the biosensing system. They are designed in a differential configuration, reference and active sensor, to counteract all possible mismatches such as temperature fluctuations and variations in the ion content of the solution. The surface of the sensor is biochemically functionalized with a synthetic probe specifically developed for the selected target. The successful combination of all of these elements allowed the system to detect IgG antibodies spiked in buffer with a limit of detection of below 100 pg/mL. In a real case study for viral infection diagnosis, the system has been challenged with infected human serum samples for digital counts of anti-dengue virus antibodies, achieving the detection of clinically relevant target concentrations. Also, the bio-reconfigurability of the system has been successfully tested with oligonucleotide detection down to pM target concentration. To allow the portability of the entire measurement setup, the setup has been equipped with a custom electronic board based on an FPGA module allowing a multiplexing approach for the parallel reading of several electrodes. The final system provides simple and effective bio-reconfigurability, exploiting advances in bio-recognition through proper probe selection and boosting the possible use of multiplex sensing to a broad spectrum of needs.
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Sengupta, Reshmi y Debasis Rooj. "Does Crop Insurance Promote Nutrition and Good Health Among Women and Children in the Agrarian Households of India?" En India Studies in Business and Economics, 211–39. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-4413-2_8.
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AbstractImproving maternal and child health is one of the top objectives of Sustainable Development Goals (SDG). The use of maternal services can help improve both maternal and child health. However, the factors influencing such utilizations are complex and can be determined by several factors. This paper aims to examine the role of crop insurance on health-seeking behaviour among women of reproductive age. We also examine the nutritional outcome of children below 5 years. We use two nationally representative data sets and combine them using district as the common identification level. To capture the health-seeking behaviour, we use several measures of antenatal care use, safe delivery, and postnatal care as outcome variables. We use multilevel regression to find that women in districts with higher crop insurance adoption seek more antenatal care than their counterparts with lower crop insurance adoption. Further, we observe that these groups of women are more likely to opt for institutional delivery and receive postnatal care in a private facility. Apart from secondary data analysis, we also conduct a pilot survey in the two districts of Bihar. Using a sample size of 400 households, we find that households who are beneficiaries of the Government of India’s recently launched income support programme (PM-Kisan Samman Niddhi Yojna) report a greater level of food security. Women from these households seek higher early antenatal care. Finally, children from the benefited households received higher immediate postnatal care. Therefore our finding suggests that crop insurance and income support programmes for the farmers not only provide a hedge against crop loss by ensuring some degree of certainty and ensuring income smoothing but also positively impact food security for the households, improve healthcare-seeking practices by women in their reproductive age and improves child nutritional outcomes.
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Burri, Haran, Jens Brock Johansen, Nicholas J. Linker y Dominic Theuns. "Case 22". En The EHRA Book of Pacemaker, ICD and CRT Troubleshooting Vol. 2, editado por Haran Burri, Jens Brock Johansen, Nicholas J. Linker y Dominic Theuns, 86–89. Oxford University Press, 2022. http://dx.doi.org/10.1093/med/9780192844170.003.0022.
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Burri, Haran, Jens Brock Johansen, Nicholas J. Linker y Dominic Theuns. "Case 5". En The EHRA Book of Pacemaker, ICD and CRT Troubleshooting Vol. 2, editado por Haran Burri, Jens Brock Johansen, Nicholas J. Linker y Dominic Theuns, 18–21. Oxford University Press, 2022. http://dx.doi.org/10.1093/med/9780192844170.003.0005.
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A 27-year-old man with congenital heart disease and sick sinus syndrome had been implanted with an epicardial dual-chamber PM, with inactivation of the ventricular lead due to loss of capture. He was admitted to the emergency room because of palpitations and breathlessness upon exertion.
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Zeiler, Michael, Nikolas Dietzel, Peter L. Kolominsky-Rabas, Elmar Graessel y Hans-Ulrich Prokosch. "Evaluation of a Digital Dementia Registry’s IT Architecture After a Three-Year Period in Practice: digiDEM Bayern". En dHealth 2024. IOS Press, 2024. http://dx.doi.org/10.3233/shti240010.
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Introduction: The project “digiDEM Bayern” aims to set up a registry with long-term follow-up data on people with dementia and their family caregivers. For that purpose an Electronic Data Capture (EDC) system linked with a Participant Management (PM) system has been established. This study evaluates the acceptance and usability of the IT tools supporting all data management processes in order to further improve the system and associated processes. Methods: For this purpose we collected the key numbers of the registry, and used the System Usability Scale (SUS) to evaluate the interactions of the data management systems in a wide area. Results: Thirty-six research partners (RP) and six study team (ST) members completed the anonymous online survey. The EDC system overall reached an average SUS score of 73.42 and the PM system of 77.92. Discussion: The two systems fulfil their required task and, therefore, simplify the work of the RP in the data collection process and of the ST during the data quality checks. Conclusion: Integrating the used systems is therefore recommended for registry studies in other medical areas.
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"We present here applications of the nanoscale metal particles for transformation of carbon tetrachloride (CT). CT is one of the most prevalent contaminants in soils and aquifers. It has been listed as priority pollutants by the U.S. Environmental Protection Agency, and also appeared on the Superfund National Priority List. There is an urgent need to develop effective control and treatment methods. The purpose of this study was aimed to measure the rate and extent of dechlorination, characterize and quantify reaction intermediates and final products. EXPERIMENTAL METHODS Synthesis of nanoscale iron particles. Nanoscale iron particles were synthesized by adding 1:1 volume ratio of FeCI3*6H20 (0.045M) into NaBH4 (0.25M) solution and mixed vigorously under room temperature (22±1 °С) for a few minutes. Ferric iron (Fe3+) was reduced to zero-valent iron (Fe°) by borohydride, a strong reductant. Metal particles from this reaction have sized mostly in the range between 1 to 100 nanometers [1,2]. BET analysis gave a specific surface area of 35 m2/g. Batch experiments. Batch experiments were conducted with 50 mL serum bottles. In each batch bottle, 20 mL deionized water was mixed with 0.25 g of the nanoscale metal particles. Then, 10 pL stock solution of CT dissolved in methanol was spiked into the solution. Initial organic concentration was about 0.1 mM. The serum bottles were capped with Teflon Mininert valves and mixed on a rotary shaker (30 rpm) at room temperature (22±1°C). Parallel experiments were also performed without the metal particles (control) and with a commercial grade iron (Aldrich, 99%, <10 pm, BET surface area 0.9m2/g ). Methods of Analyses. Organic concentrations were measured by the static headspace gas chromatograph (GC) method. At selected time intervals, 20 pL headspace aliquot was withdrawn from the batch bottle for GC analyses. Concentrations of chlorinated methanes were measured using a HP5890 GC equipped with a DB-624 capillary column (30mx0.32mm) and an electron capture detector (ECD). The detection limit of this method was less than 5 pg/L. Hydrocarbon products in the headspace were qualitatively identified with a Shimadzu QP5000 GC-MS and further quantified with GC analysis by comparing retention times and peak areas with standard gas samples (ethane, ethylene, acetylene, methane and carbon dioxide)." En Hazardous and Industrial Waste Proceedings, 30th Mid-Atlantic Conference, 70. CRC Press, 2014. http://dx.doi.org/10.1201/9781498709453-25.
Texto completoActas de conferencias sobre el tema "Capteur PM"
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Ebert, Johannes. "Innovative New Air Pollution Control Technologies to Capture NOx, PM and Hg". En 2013 21st Annual North American Waste-to-Energy Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/nawtec21-2715.
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Emission regulations throughout the world continue to tighten, creating technical and economic challenges for various industries. The U.S. has proposed strict emissions limits that include mercury (Hg), particulate matter (PM) and a growing focus on NOx, while Europe is focusing more aggressively on reducing Nitrogen Oxides (NOx) and PM emissions first. Innovative new technologies are being developed and introduced to meet proposed emissions levels for industries such as waste to energy facilities, Cement clinker producers and Sintering processes. Catalytically active ceramic or textile filter media have been applied over the past 15 years ensuring a simultaneous removal of PM, NOx and PCDD/F-compounds. A new textile filter type containing 2 filter bags (bag-over-bag) has recently been designed for such a multi-functional approach at elevated filter temperatures (T>170°C) where PMs are filtered on an ePTFE membrane (1st layer) and NOx is reduced by a catalytic reaction (2nd layer) with NH3 injected upstream. The separate bag construction enables the removal of the catalytic inner bag once it has been deactivated by ammonium-(bi)-sulphates. An appropriate regeneration process outside the bagfilter was developed for such new DeNOx system. The implementation of this 2-layer filter bag concept into existing Air Pollution Control (APC) systems and the catalyst management has been demonstrated on full-scale at the waste to energy facility of Acegas APS Padova (Italy). Emissions of NOx (as NO2) < 70mg/Nm3 with NH3<3mg/Nm3 with PM<0,5mg/Nm3 can be constantly achieved. The implementation of this filter bag system achieves highest energy efficiency, lowest costs for consumables when it is applied in dry sorption filters at elevated temperatures. In U.S., the strong demand for lowest Hg emission promotes innovative solutions for efficient and reliable Hg removal. Hg can be efficiently captured in a new fixed sorbent bed technology which is installed downstream the baghouse. This paper presents the innovative concepts for multi-functional filter as well as for Hg removal, showing also field data of both new technologies.
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Wagstaff, Christopher, Mohammad AlGahtani, Sylvain Michaux, Sai Shrinivas Sreedharan, Deoras Prabhudharwadkar y William Roberts. "Technology Demonstration of Multi-Species (CO2, SO2, NO2, & PM) Capture". En ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/216559-ms.
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Abstract Post-combustion capture of carbon dioxide usually requires other upstream pollutant capture systems such as selective catalytic reduction for NOx, flue gas desulfurization, electrostatic precipitators, etc (Dziejarski et al. (2023)). Traditional carbon capture technologies cannot be deployed at point emission sources that do not have these systems and use fuels containing sulfur (e.g., heavy fuel oil, sour gas, etc.). A novel pollutant capture system is being developed at KAUST that eliminates this limitation. A Cryogenic Carbon and Sulfur Capture (CCSC) technology is developed in partnership with Sustainable Energy Solutions (SES, part of Chart Industries). This technology focuses on post-combustion CO2 capture along with SO2, NO2, and other Particulate Matter (PM) pollutants. CCSC is modular in design and mounted on a 15-meter-long trailer. The multi-species co-capture system is mounted in the central section of the trailer and includes a separate control room and gas storage room on either end of the trailer. This trailer-mounted CCSC system has a nominal capacity of capturing 0.25 ton of CO2/day. This CCSC process cools exhaust flue gases below the desublimating temperatures of CO2 (~−130°C) where CO2 solidifies out of the flue gas. This separation process is done by spraying isopentane as a contact liquid into an upward-moving flue gas. CO2 freezes into the contact liquid and ultimately flows out as a slurry. The contact liquid is regenerated via screwpress, and then the interstitial liquid is recovered via distillation. An additional column is necessary for the separation of a third species SO2. The main objective of this trailer rig is to serve as a technology and IP development platform to cocapture multiple pollutants all using a single technology. The trailer rig is designed to be flue gas agnostic and finds applications in many facilities. Even though the system is currently optimized for the most probable site which is a heavy fuel oil (HFO) fired steam power plant, it can easily be adapted to shipboard carbon capture and co-capture of other pollutants more prominent from marine applications. A wetted-wire patented technology from KAUST (Wagstaff et al. (2022)) already shows promise for shipboard heat and mass transfer.
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Viswanathan, Sandeep, Stephen S. Sakai, Mitchell Hageman, David E. Foster, Todd Fansler, Michael Andrie y David A. Rothamer. "Effect of Particle Size Distribution on the Deep-Bed Capture Efficiency of an Exhaust Particulate Filter". En ASME 2014 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icef2014-5464.
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The exhaust filtration analysis system (EFA) developed at the University of Wisconsin – Madison was used to perform micro-scale filtration experiments on cordierite filter samples using particulate matter (PM) generated by a spark-ignition direct injection (SIDI) engine fueled with gasoline. A scanning mobility particle sizer (SMPS) was used to characterize running conditions with four distinct particle size distributions (PSDs). The distributions selected differed in the relative number of accumulation versus nucleation mode particles. The SMPS and an engine exhaust particle sizer (EEPS) were used to simultaneously measure the PSD downstream of the EFA and the real-time particulate emissions from the SIDI engine to determine the evolution of filtration efficiency during filter loading. Cordierite filter samples with properties representative of diesel particulate filters (DPFs) were loaded with PM from the different engine operating conditions. The results were compared to understand the impact of particle size distribution on filtration performance as well as the role of accumulation mode particles on the diffusion capture of PM. The most penetrating particle size (MPPS) was observed to decrease as a result of particle deposition within the filter substrate. In the absence of a soot cake, the penetration of particles smaller than 70 nm was seen to gradually increase with time, potentially due to increased velocities in the filter as flow area reduces during filter loading, or due to decreasing wall area for capture of particles by diffusion. Particle re-entrainment was not observed for any of the operating conditions.
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Bari, S. y R. Marian. "Evolution of Risk of Diesel Engine Emissions on Health During Last 4 Decades and Comparison With Other Engine Cycles: An Innovative Survey". En ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51887.
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Technological evolution has sometimes surprising and unintended consequences. Diesel engine improved drastically over time. Superficially, this translated into transforming dirty, smoky diesel engines into very clean units. However, the particles emitted by the latest engines are a several orders of magnitude smaller and more numerous. They are known as Ultra-fine particles (UFP). When they are formed in the combustion process, their surface adsorbs and traps harmful chemicals that may end up being delivered, aspired and harming humans, animals and plants. Over 40 mutagenic and carcinogenic chemicals are present in diesel exhaust particulates. Existing ceramic type filter for diesel engines, known as diesel particulate filter (DPF), is used to reduce both particulate matter (PM) number and mass concentration. The main disadvantages of DPF are cost, clogging of the filters and mechanical cracking during regeneration which causes them to fail. Alternative to DPF, devices made of metallic materials known as flow through filters (FTF) have become promising PM emission control devices. FTF have low pressure drop and less complex structure compared to DPF, but PM reduction efficiencies much lower than DPF. FTF with corona charging upstream of the filter to charge PM and imposing an electrostatic field onto the FTF to capture the PM is another alternative to DPF. This is known as electrostatic diesel particulate matter filtration system (EDPS). The EDPS has 40% more efficiency than FTF, but 10% less than DPF. This paper presents a thorough literature review on emissions, distribution of particles, their evolution and effects on health in the last 4 decades across spark ignited and compression ignited engines. The paper also discusses the characteristic and evolution of DPF, FTP and EDPS to capture diesel particles.
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Wu, Yuanyu y Jianzhu Cao. "Analysis of Tritium Production and Distribution in HTR-PM". En 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-30147.
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The research on radiological impact of tritium is highly concerned in high temperature gas-cooled reactors. In order to better assess the environmental performance of HTR-PM (HTR demonstration project with 2 × 250MW plants), analysis of tritium behavior in HTR-PM is conducted in this paper. The main production sources of tritium are the ternary fission in the fuel and neutron capture reactions of some nuclides. Based on the tight interactions between tritium sources and sinks, differential equations are built to describe tritium behavior in primary and secondary loop. Specific analysis is conducted to tritium permeation through heat exchanger walls to secondary loop, considering the oxidation of alloys used for heat exchanger. Applied with the parameters of HTR-PM, tritium concentration in primary and secondary loop is calculated, and the amount of tritium released to the environment is evaluated. The evaluation shows that the amount of tritium released to the environment is less than the limit value prescribed by Chinese regulation on radiation protection. The calculation results can also be applied to the safety analysis and used to guide the design of relevant systems and equipments for the HTR-PM.
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Dmytryshyn, Taras, Mohamed Ismail y Ola Rashwan. "A Novel Modeling Approach for Solving the Cell Formation Problem". En ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88128.
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This paper presents a new modeling approach called Progressive Modeling (PM) and demonstrates it by solving the Cell Formation Problem (CFP). In this paper, the Progressive Modeling (PM), a component-based optimization technique, is used to solve the cell formation problem (CFP). This novel solution algorithm is utilized to find optimal or near-optimal solutions. A user-friendly Windows application is presented to capture the problem data, demonstrate the solution process, and display the results. A benchmark problem in the literature is solved and presented in this paper. The paper concludes by demonstrating the efficiency of the new modeling approach and its future extension.
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Khan, M. A. y P. Pillay. "Design of a PM wind generator, optimised for energy capture over a wide operating range". En International Electric Machines and Drives Conference. IEEE, 2005. http://dx.doi.org/10.1109/iemdc.2005.195919.
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Bardwell, M., S. Bari y R. Marian. "An Approach to Clean Particulates From Diesel Emissions: EDPS Baseline Prototype Testing Equipment and Methodology". En ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71325.
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Diesel exhaust particulate matter (PM) is deadly to humans, animals and plants so the future of diesel engine is uncertain. Alternative powered vehicles have major limitations and costly. Recent developments to limit PM emissions have significant disadvantages to the point where they cannot be considered to be reliable long term technical and economical solutions. Electrostatic filtration could be used together with existing filters or as a standalone system. The most popular method of decreasing PM emissions is by the use of ceramic diesel particulate filters which is not efficient at filtering ultrafine particulates. Electrostatic filtration is a promising approach which can capture ultrafine particulates which could be used in conjunction with ceramic DPFs, metallic flow through filters (FTF) or, ideally as a standalone system. Development of prototype electrostatic diesel particulate filtration systems (EDPS) requires reliable testing. Prototyping needs quick, repeatable and affordable results to validate theories and a solution had to be developed. This paper presents the development of the EDPS prototype testing procedures and equipment with preliminary test results. By repurposing proven test equipment for the use of exhaust sampling, a test rig and a repeatable procedure for testing prototype filters were developed with low initial and ongoing costs.
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Sobhani, S. "Computational Modeling of PM-HIP Capsule Filling and Consolidation by DEM-FEA Coupling". En Hot Isostatic Pressing. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902837-20.
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Abstract. Power Metallurgy Hot Isostatic Pressing (PM-HIP) is a manufacturing process, capable of producing net shape or near net shape components with complicated geometries from materials that are often difficult to cast and/or deform. However, the post-HIP quality and requirement of any additional process, such as machining, depends on the design and geometric complexity of the capsule. First of a kind geometry often requires several iterations of prototype builds. Considering the cost and long durations of HIP cycles, usage of computer models in order to predict parameters for an optimal capsule design of a PM-HIP process which produces a sound product in the first trial is extremely valuable. In this study, the pre-consolidation capsule filling process is simulated by Discrete Element Method (DEM) to capture the initial relative density. Finite element analysis (FEA) modeling of HIP, which includes a combined constitutive model based on compressive and consolidative mechanical behavior of powder uses the DEM results as input. Accuracy of the simulation tool is confirmed by comparing against a corresponding physical PM capsule fabrication and HIP experiment with pre- and post-HIP 3D scanning. The result shows that consolidation occurs as the model predicts, with negligible deviations on sharp edges.
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Ovcherenko, S. S., D. M. Nasonov, A. V. Shernyukov, A. V. Endutkin, D. O. Zharkov y E. G. Bagryanskaya. "OXOG:C AND OXOG:A BASE PAIR OPENING DYNAMICS BY NMR MAGNETIZATION TRANSFER FROM WATER". En X Международная конференция молодых ученых: биоинформатиков, биотехнологов, биофизиков, вирусологов и молекулярных биологов — 2023. Novosibirsk State University, 2023. http://dx.doi.org/10.25205/978-5-4437-1526-1-199.
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We adapted the CLEANEX-PM NMR protocol to detect DNA imino proton exchange with water protons and analyze the opening dynamics of base pairs containing 8-oxoguanine (oxoG): oxoG:C, oxoG:A and pairs G:C, G:A in model DNA duplexes. According to our data, the oxoG:C pair did not open easier than G:C, arguing against extrahelical base capture by Fpg/OGG1. In the oxoG:A mispair the equilibrium is shifted by 3−4 orders of magnitude toward the open state and we hypothesize oxoG extrahelical recognition by MutY/MUTYH.
Informes sobre el tema "Capteur PM"
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Gardner, D. G. y M. A. Gardner. Preliminary evaluation of neutron capture cross sections for /sup 144/Sm, /sup 145/Sm and /sup 145/Pm. Office of Scientific and Technical Information (OSTI), febrero de 1986. http://dx.doi.org/10.2172/5872583.
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Chan, Wanyu R., Sangeetha Kumar, Alexandra Johnson y Brett C. Singer. Simulations of short-term exposure to NO2 and PM2.5 to inform capture efficiency standards. Office of Scientific and Technical Information (OSTI), marzo de 2020. http://dx.doi.org/10.2172/1633270.
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