Gotowe bibliografie tematyczne / Particulate

Gotowa bibliografia na temat „Particulate”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 21 lutego 2023

Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych

Wybierz rodzaj źródła:

Spis treści

Zobacz listy aktualnych artykułów, książek, rozpraw, streszczeń i innych źródeł naukowych na temat „Particulate”.

Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.

Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.

Artykuły w czasopismach na temat "Particulate"

1

Kim, Yeon Ju, Yeon-Dong Kim, Hyungtae Kim, Dong Ji Ahn, Ha-Jung Kim, Won Uk Koh i Young-Jin Ro. "Interaction between Dexamethasone, Ropivacaine, and Contrast Media Used in Interventional Pain Treatment: Considerations in Safety". Medicina 58, nr 12 (19.12.2022): 1871. http://dx.doi.org/10.3390/medicina58121871.

Pełny tekst źródła
Streszczenie:
Background and Objectives: Although epidural steroid injections are used as an effective treatment, this technique is associated with rare but serious ischemic complications, especially when particulate steroids are used. However, recent studies have reported that even if non-particulate steroids are used, particulates are formed by the interaction with some local anesthetics (LA), causing ischemic complications. This observational study evaluated commonly used combinations of non-particulate steroids and LA with contrast media via microscopic analysis and analyzed the chemical properties of each mixture to identify the correlation of particulate formation. Materials and Methods: Commonly used clinical non-particulate and particulate steroids, contrast media, and LA agent combinations were evaluated macroscopically and microscopically. The pH values were also measured at both room temperature (26 °C) and body temperature (36 °C). Where particulates were observed, the particulate size was measured. Results: Macroscopically, the mixture of non-particulate steroid and ropivacaine had a slightly cloudy appearance at all concentrations, but there was no visible particulate. However, when observed under a microscope, the pH-dependent particulate formation was observed at all concentration combinations tested. (0.1% ropivacaine: from 19 μm to 70 μm, and 0.2% ropivacaine: from 37 μm to 108 μm at room temperature (26 °C)). When contrast media was mixed or the temperature was raised to body temperature (36 °C), the number and size of the particulates decreased or dissolved. Conclusions: The combination of ropivacaine and dexamethasone, a non-particulate steroid, mainly used in epidural injections, forms particulates. However, when mixed with contrast media, particulates are dissolved because of changes in pH and factors affecting particulate formation. In fluoroscopy-guided injections, the use of contrast media could resolve particulate formation.
Style APA, Harvard, Vancouver, ISO itp.
2

Guo, Su Juan, Guo Zheng Kang i Cheng Dong. "Numerical Simulations for Uniaxial Ratcheting of SiCP/6061Al Composites Concerning Particulate Arrangement". Advanced Materials Research 26-28 (październik 2007): 317–20. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.317.

Pełny tekst źródła
Streszczenie:
Based on three dimensional cubic unit cell models containing several particulates with certain particulate arrangements, the monotonic tensile and uniaxial ratcheting behaviors of particulate reinforced metal matrix composites (i.e., T6-treated SiCP/6061Al composites) were numerically simulated by using elastic-plastic finite element code ABAQUS with help of newly developed user material subroutine (UMAT). In the simulations, the effects of different particulate arrangements inside the unit cell models on the monotonic tensile and ratcheting behaviors of the composites were discussed. It is shown that the effect of particulate arrangement on the ratcheting of the composite depends on the arranged modes and the number of particulates contained in the model, and the interaction between particulates can be represented reasonably by the cubic unit cell model with a suitable distribution of multi-particulates.
Style APA, Harvard, Vancouver, ISO itp.
3

Grimm, Christian, Agnès Feurtet-Mazel, Oleg S. Pokrovsky i Eric H. Oelkers. "Riverine Particulate Matter Enhances the Growth and Viability of the Marine Diatom Thalassiosira weissflogii". Minerals 13, nr 2 (26.01.2023): 183. http://dx.doi.org/10.3390/min13020183.

Pełny tekst źródła
Streszczenie:
Riverine particulates dominate the transport of vital nutrients such as Si, Fe or P to the ocean margins, where they may increase primary production by acting as slow-release fertilizer. Furthermore, the supply of particulate surface area to the ocean is considered to be a major control of organic carbon burial. Taken together, these observations suggest a close link between the supply of riverine particulate material and the organic carbon cycle. To explore this link, we conducted microcosm experiments to measure the growth of the marine diatom Thalassiosira weissflogii in the presence and absence of different types and concentrations of riverine particulate material. Results demonstrate a strong positive effect of riverine particulate material on diatom growth with increased total diatom concentrations and slowed post-exponential death rates with increasing particulate concentration. Moreover, SEM and optical microscope investigations confirm that riverine particulates facilitate organic carbon burial through their role in the aggregation and sedimentation of phytoplankton. The supply of riverine particulate material has been shown to be markedly climate sensitive with their fluxes increasing dramatically with increasing global temperature and runoff. This pronounced climate sensitivity implies that riverine particulates contribute substantially in regulating atmospheric CO2 concentrations through their role in the organic carbon cycle.
Style APA, Harvard, Vancouver, ISO itp.
4

Hunter, C. E., H. A. Cikanek i T. P. Gardner. "Evaluation of Some Factors Controlling DI Diesel Combustion and Exhaust Emissions". Journal of Engineering for Gas Turbines and Power 111, nr 3 (1.07.1989): 379–86. http://dx.doi.org/10.1115/1.3240265.

Pełny tekst źródła
Streszczenie:
The combined effects of turbocharging, high fuel injection pressure, and reduced oil consumption on diesel exhaust emissions were investigated using a single-cylinder research engine. The influence of these exhaust emission control concepts on particulate composition was determined using a new particulate analysis method. In addition, the dependence of particulate composition on engine load and air utilization was examined using the microfumigation technique. Simultaneous application of these emissions control concepts reduced exhaust particulates by 70 percent. High injection pressure reduced the insoluble component of particulates, while reducing oil consumption and turbocharging the engine lowered both soluble and insoluble particulates. Reductions in oil-derived particulates with increasing engine load were partially attributed to increases in volumetric air utilization. Ninety percent of the lube oil found in exhaust particulates was unburned; however, similar concentrations of unburned and partially oxidized components were observed in fuel-derived particulates.
Style APA, Harvard, Vancouver, ISO itp.
5

Roman, Monika, Kamil Roman i Michał Roman. "Spatial Variation in Particulate Emission Resulting from Animal Farming in Poland". Agriculture 11, nr 2 (19.02.2021): 168. http://dx.doi.org/10.3390/agriculture11020168.

Pełny tekst źródła
Streszczenie:
The article presents a spatial variation in particulate emission from animal farming in Poland. In addition, this paper estimates the PM2.5 and PM10 particulate emissions. The data on respective emissions sources have been acquired from the Central Statistics Authority (GUS) of 2019 (Local Data Bank). The emissions of PM2.5 and PM10 particulates were estimated from the structure of the emissions sources covered in the “EEA/EMEP Emission Inventory Guidebook” following the Tier 1 method. The research shows that, in Poland, the biggest share in particulate emission is found for poultry and cattle farming, which are the emissions of 5.5 and 3 m kg of particulates annually all across Poland, respectively. The highest pollution with PM2.5 resulting from animal farming was recorded for the Podlaskie (0.19 kg/ha), Wielkopolskie (0.16 kg/ha), and Mazowieckie (0.14 kg/ha) provinces, whereas the highest pollution with PM10 was recorded for the Wielkopolskie province (0.83 kg/ha). The key sources of particulate emission indicated in the study facilitate adapting the adequate method to reduce the particulate emissions in respective provinces. It is essential, especially due to the negative effect of particulates on human health.
Style APA, Harvard, Vancouver, ISO itp.
6

Fang, Guor-Cheng, Yuh-Shen Wu, Wen-Jhy Lee, Te-Yen Chou i I.-Chen Lin. "Seasonal variation in concentration and metallic constituents of atmospheric particulates near the western coast of central Taiwan". Toxicology and Industrial Health 22, nr 5 (czerwiec 2006): 193–201. http://dx.doi.org/10.1191/0748233706th262oa.

Pełny tekst źródła
Streszczenie:
In addition to determining the concentration and metallic constituents of particulate matter at Taichung Harbor in central Taiwan, this study attempts to characterize the mass, metallic elements, composition and concentrations of total suspended particulates (TSP), fine particles and coarse particles. Statistical approaches, such as the Spearman tests, were also adopted to determine the seasonal variations of concentrations of these pollutants. Experimental results indicate that the mean TSP, fine particulate and coarse particulate concentrations in spring and winter are higher than in summer and autumn on the western coast of central Taiwan. Spearman statistical analysis of metallic elements Mn and Pb showed high concentration coefficients for fine and coarse particulates on the western coast of central Taiwan. The order of mean metallic concentrations in TSP, coarse particulates and fine particles was Fe-Zn-Mg-Cu-Cr-Mn-Pb in TSP, Fe-Cu-Zn-Mg-Mn-Pb-Cr in coarse particulates and Fe-Cu-Mg-Pb-Zn-Mn-Cr in fine particulates.
Style APA, Harvard, Vancouver, ISO itp.
7

Danciulescu, Valeriu, Luoana Florentina Pascu, Mihaela Petrescu, Andreea Cozea, Raluca Diodiu, Gheorghita Tanase i Maria Pasca. "The influence of emission sources on particulate matter pollution in adjacent areas". SIMI 2019, SIMI 2019 (20.09.2019): 253–58. http://dx.doi.org/10.21698/simi.2019.fp33.

Pełny tekst źródła
Streszczenie:
Particulates generated by anthropogenic activities are found in the ambient air in varying amounts, in a wide range of sizes and in a wide variety of chemical composition. The concentration of particulates at one site, as well as their composition, are influenced by their origin and dispersion factors. By chemical and dimensional analysis of particulates in an area, we can draw preliminary conclusions about the origin and level of pollution in that area. This paper presents the results obtained by concomitant monitoring of particulates emissions and the concentration of particulate matter in ambient air in the adjacent area of an industrial plant. The result of the measurements obtained and their correlation with the specific conditions during the monitoring period lead us to the conclusion that the concentration of particulate matter at the emission sources directly influences the concentrations of particulate matter in the neighbouring area.
Style APA, Harvard, Vancouver, ISO itp.
8

Patel, Murlidhar, Sushanta Kumar Sahu i Mukesh Kumar Singh. "Fabrication and Investigation of Mechanical Properties of SiC Particulate Reinforced AA5052 Metal Matrix Composite". Journal of Modern Materials 7, nr 1 (6.07.2020): 26–36. http://dx.doi.org/10.21467/jmm.7.1.26-36.

Pełny tekst źródła
Streszczenie:
In this present research particulate reinforced aluminium metal matrix composites are developed by using sand mould and liquid stir casting processing route in which AA5052 reinforced with 5 wt. % SiC particulates of 63µm particle size. The density, porosity, micro-hardness, and compressive strength of SiC particulate reinforced AA5052 MMC were investigated and compared these properties with similar properties of unreinforced AA5052. The microstructure of the developed composite was also analysed by using optical microscopy, SEM, and XRD. Developed particulate reinforced Al metal matrix composite gives improved hardness and compressive strength as compared to the unreinforced AA5052. The addition of 5 wt. % SiC particulates increases the density of AA5052.
Style APA, Harvard, Vancouver, ISO itp.
9

Yu, Yun Jiang, Qiong Wang, Zhong Ren Nan, Yan Ping Zhang, Hai Peng Lin i Sheng Li Wang. "Distribution Characteristics and Health Risk Assessment of Heavy Metal Pollutants on Air Particulate Matters in Lanzhou City". Advanced Materials Research 518-523 (maj 2012): 961–69. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.961.

Pełny tekst źródła
Streszczenie:
In order to learn the present situation of heavy metals on particulate matters and evaluate their health risk, this paper cites the examples of District Xigu which is severely polluted and Town Yuzhong which is slightly polluted in Lanzhou city, the concentration of heavy metals attached on particulate matters in different seasons and different regions is measured, and the distribution proportion of heavy metals in different diameters of particulates is analyzed. Based on the health risk evaluation model recommended by USEPA, this paper evaluates health risks of pollution caused by heavy metals on atmosphere particulates at different sampling places in Lanzhou city. The result shows that heavy metal attached on particulate matter in Lanzhou city is distributed seasonally and regionally. Heavy metals on particulate matters in Lanzhou city are mainly attached on particulates of which the diameters are less than 10μm(PM10). In terms of horizontal gradient, the hazard index of heavy metal in the total suspension particulates in severely-polluted district of Lanzhou city in winter is greater than 1. In terms of vertical gradient, the hazard index of heavy metals on total suspension particulates 15m above ground in winter is greater than 1. These polluted aspects should be treated. The carcinogenic risk of chromium exceeds 10-6~10-4which is acceptable scope stipulated by USEPA and should be well handled.
Style APA, Harvard, Vancouver, ISO itp.
10

Száková, J., J. Sysalová i P. Tlustoš. "Particular aspects of environmental impact of potentially risk elements from airborne particulate matter". Plant, Soil and Environment 51, No. 8 (19.11.2011): 376–83. http://dx.doi.org/10.17221/3613-pse.

Pełny tekst źródła
Streszczenie:
Two simple experiments were carried out to demonstrate two possible ways of environmental impact of element contents in airborne particulate matter. In the first part of the experiment, the response of three rural dust samples applied into the soil were assessed in pot experiment to observe uptake of As, Cd, Pb, and Zn by aboveground biomass of oat (Avena sativa L.). Although the element contents in dust samples exceeded significantly total element contents in soil, the element content in plants was not affected by single-rate soil amendment with rural dust sample. Soil sorption capacity and neutral pH of the experimental soil (7.0) was sufficient for immobilization of the elements. However, potentially mobilizable portions (0.005 mol/l DTPA extractable) of elements significantly increased (Cd by 116%, Pb by 39%, Zn by 50%) in the treated soil, which suggests a possible release of these elements in long-term horizon. On the contrary, high percentages of potentially toxic elements (Cd, Zn, Ni) in the most mobile (exchangeable) fractions were determined in the second part of investigation in two urban dust samples collected in Prague Letná automobile tunnel, and Prague subway station Museum. These results suggest possible direct impact of mobile, and thus potentially bio-available, element fractions on human environment. The results of both particular experiments cannot give complete information concerning behavior of harmful pollutants in airborne particulate matter and their influence on human health. They can however indicate two of possible ways of environmental pollution with this material. Yet, it would require a more detailed investigation in future.
Style APA, Harvard, Vancouver, ISO itp.
Więcej źródeł

Rozprawy doktorskie na temat "Particulate"

1

McHugh, Catherine Jane. "The delivery of DNA vaccines using particulate and non-particulate adjuvants". Thesis, University College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413241.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
2

Ouhssain, Malika. "Caractéristiques et origines de la variabilité diurne des propriétés optiques". Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066138/document.

Pełny tekst źródła
Streszczenie:
Mon travail de thèse s’est développé, pour le cas particulier des observations satellitales à partir de l’orbite géostationnaire. Le but général a été de caractériser la variabilité diurne des propriétés optiques inhérentes (i.e. les coefficients d‘atténuation et de rétrodiffusion particulaire, cp et bbp) et apparentes (i.e. la réflectance, R) des eaux océaniques (« forme » du cycle diurne, amplitude, variations saisonnières, causes). Ces propriétés optiques déterminent le signal qu’un instrument embarqué à bord d’un satellite peut observer. Cette étude est une étape préliminaire permettant de comprendre la physique du problème, avant de pouvoir évaluer la possibilité de quantifier cette variabilité diurne à partir des observations satellitaires. La variabilité diurne de cp et bbp est donc étudiée en fonction des saisons définies selon les conditions physico-trophiques: le mélange, le bloom, son déclin, et l’oligotrophie. cp et bbp sont caractérisés par un cycle diurne, augmentation le jour et diminution la nuit, confirmant les tendances générales connues. Ce phénomène se produit durant toutes les saisons avec une variabilité intra-saisonnière qui différencie les cycles de cp et bbp: cp montre une amplitude plus large durant le bloom, contrairement à bbp les minima de cp et bbp sont synchronisés tandis que les maxima de bbp sont atteints 3 à 6 h avant ceux de cp, sauf pendant le bloom. L’augmentation journalière de bbp se reflète dans les changements de R. Toutefois, les résultats ont montré que l’inversion ne permet pas de reproduire l’augmentation journalière de bbp de façon satisfaisante. Les techniques d’inversion existantes ne sont pas adaptées pour une utilisation à haute fréquence
My thesis is developed for the particular case of satellites observations from geostationary orbit. The overall aim was to characterize the diel variability of water inherent (i.e. the particulate beam attenuation and backscattering coefficients, cp and bbp) and apparent (i.e. reflectance, R) optical properties (“shape”of diel cycle, amplitude, seasonal variations, origins). These properties determine the signal which is observed from sensor aboard satellite. This study is a preliminary step in understanding the physical problem, before assessing the possibility of quantifying the diel variability from satellite observations. Diel variability of cp and bbp is studied by season, as defined by physical and trophic conditions: mixing, bloom proliferation, its decline, and oligotrophy. Both cp and bbp are characterized by a diel cycle of daytime increase and nighttime decrease, confirming known general trends. This occurs across all seasons, but intra-seasonal variability differed between cp and bbp cycles: unlike bbp, cp show larger amplitude of diurnal variation during the bloom cp and bbp minima are synchronized while bbp minima are attained 3-6 h before those of cp, except during the bloom. Daily changes of R are consistent with the variations of bbp. Nevertheless, it is still difficult to reproduce the diurnal increase of bbp by inversion of R. The differences observed between in situ and modeled values of bbp suggest that the performance of inversion is degraded when it is used at high frequency
Style APA, Harvard, Vancouver, ISO itp.
3

Raj, Kolupula Yuva Deva. "Chromatic Particulate Monitoring System". Thesis, University of Liverpool, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526954.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
4

Beauboeuf, Daniel P. "Microscopy investigations of ash and particulate matter accumulation in diesel particulate filter surface pores". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59894.

Pełny tekst źródła
Streszczenie:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 60).
There has been increased focus on the environmental impact of automobile emissions in recent years. These environmental concerns have resulted in the creation of more stringent particulate matter emissions regulations in the United States and European Union. These limits have forced diesel engine manufacturers to reduce particulate matter (PM) emissions by an order of magnitude beginning in 2007. Diesel particulate filters (DPF) provide the most effective means of reducing PM emissions from diesel exhaust. DPFs can reduce over 99% of PM in the exhaust. DPF effectiveness is limited by the accumulation of ash. Ash is comprised of incombustible material from engine lubricants. Engine oil additives based on P, Zn, S, Ca, and Mg are responsible for the majority of ash. Ash accumulation in DPFs reduces their useful life by plugging the filter's inlet channels. Ash deposition leads to increased pressure drop across the DPF, which reduces the engine's performance and negatively impacts fuel economy. The process of ash accumulation in DPF channels is not well understood. This research is focused on exploring the ash interactions with DPF walls, pores, and the catalyst washcoat. Based on scanning electron microscopy analysis of ash loaded DPFs from the field and from filters loaded with ash in the laboratory, a mechanism for ash accumulation is presented.
by Daniel P. Beauboeuf.
S.B.
Style APA, Harvard, Vancouver, ISO itp.
5

Gómez, Ana Maria Mosquera. "Modelagem da dispersão de material particulado na atmosfera a partir de fontes estacionárias utilizando fluidodinâmica computacional". Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-24102017-151559/.

Pełny tekst źródła
Streszczenie:
Neste trabalho propõe-se uma análise da dispersão de material particulado gerado por fontes estacionárias, aplicando ferramentas de Fluidodinâmica Computacional (em inglês Computatonal Fluid Dynamics, CFD), usando um modelo Euleriano para o escoamento e Lagrangeano para as partículas, em estado estacionário no software Fluent. A verificação da modelagem é apresentada em duas sessões, a primeira compreende o estudo do escoamento atmosférico em condições de estabilidade neutra incluindo os efeitos das heterogeneidades do terreno, no caso, um monte de 126m de altura em escala real. Foram comparados diferentes modelos de turbulência: padrão, RNG e parametrizado para o caso atmosférico. Os três modelos apresentaram desempenho semelhante e descrevem satisfatoriamente as tendências dos dados experimentais. A segunda, o modelo lagrangeano baseado no tempo de vida dos turbilhões (em inglês Discrete Random Walk, DRW) foi utilizado para representar a distribuição de concentrações de material particulado em um ambiente confinado. Os resultados numéricos descrevem satisfatoriamente os perfis de concentrações das partículas, porém subestimam os valores na região próxima à parede, o que indicaria que uma melhor aproximação da deposição das partículas deve ser considerada. Após estes estudos, esta abordagem euleriana-lagrangeana foi aplicada ao caso da dispersão de material particulado em condições de atmosfera neutra em uma região do Polo Cerâmico de Santa Gertrudes-SP, local responsável pela maior produção de revestimentos cerâmicos do Brasil. O trânsito de caminhões nas estradas não pavimentadas foi identificado como fonte de material particulado que atinge o perímetro urbano da cidade. Estudaram-se também as contribuições das atividades referentes à exploração das minas de argila e a preparação do solo para uso agrícola, apesar desta última não soma uma carga relevante ao ser comparada com as duas anteriores. Além da influência das fontes mencionadas, fontes de origem industriais localizadas dentro da cidade também foram consideradas no cenário.
In this study an analysis of the dispersion of particulate matter generated by stationary sources is proposed, by applying Computational Fluid Dynamics (CFD) tools, using an Eulerian model for the flow and a Lagrangean model for the particles, under steady-state conditions in the Fluent software. The model validation is presented in two sessions, the first comprises the study of the atmospheric flow under conditions of neutral stability, including the effects of the heterogeneities of the terrain. In this case, the air flow past a 126m high hill in real scale was adopted. Different turbulence models were compared: standard k-?, k-? RNG and parametrized k-?. The three models presented similar performance and described satisfactorily the trends of the experimental data. Subsequently, the Lagrangean model based on the Eddy life time (DRW - Discrete Random Walk) was used to represent the distribution of particulate matter concentrations in a confined environment. The numerical results satisfactorily describe the particle concentration profiles, but underestimate the values in the region near the wall, which would indicate that a better approximation of the particle deposition should be considered. After these studies, this Eulerian- Lagrangean approach was applied to the case of dispersion of particulate material under neutral atmosphere conditions in a region around the city of Santa Gertrudes-SP, where the Ceramic Complex is responsible for the largest production of ceramic tiles in Brazil. Transit of trucks on unpaved roads has been identified as a source of particulate matter that reaches the urban perimeter of the city. The contributions of the activities related to mining and the preparation of the soil for agricultural use were also studied, although this last one does not add a significant load when compared with the two previous ones. In addition to the influence of the mentioned sources, industrial sources located inside the city also contribute to the scenario.
Style APA, Harvard, Vancouver, ISO itp.
6

Faccio, Andréa Tedesco. "Abordagem metabolômica no estudo da exposição gestacional à poluição atmosférica". Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-07122015-101244/.

Pełny tekst źródła
Streszczenie:
Há fortes evidências dos efeitos negativos da exposição gestacional a poluentes atmosféricos. No entanto, mecanismos de atuação de poluentes não são bem compreendidos. Alterações fisiológicas anômalas na progenitora, durante o período de gravidez, podem causar mudanças permanentes na prole, que podem desencadear futuras doenças na vida adulta. Portanto, o estudo dessas alterações maternas é importante. A metabolômica é definida como a análise global do metaboloma de um organismo em experimentos comparativos, com o objetivo de observar mudanças relativas da abundância dos metabólitos, o aparecimento ou desaparecimento de metabólitos, e pode fornecer uma melhor compreensão dos mecanismos de funcionamento celular dos organismos a nível molecular. Nesse trabalho, um estudo experimental de exposição gestacional materna, ao material particulado fino (MP2,5), foi realizado, para avaliar os efeitos dessa exposição no metabolismo, por meio da análise metabolômica global da urina de camundongos fêmeas progenitoras expostas ao MP2,5 (grupo teste) ou a ar filtrado (grupo controle) durante a gestação. Um método cromatográfico e de preparo de amostra para metabolômica urinária por HILIC-MS foram otimizados. Para a otimização da condição cromatográfica, foram investigados a influência de aditivos, concentração de sal e pH da fase móvel, bem como, a rampa do gradiente. A melhor condição foi escolhida por meio da avaliação do formato de pico, da intensidade relativa e do CV do tempo de retenção para 15 m/z selecionados, assim como, pelo número total de molecular features e CV da intensidade desses molecular features. A melhor condição obtida apresenta 20 mmol/L de formiato de amônio em sua composição do solvente B da fase móvel e 95% acetonitrila e 5% solução aquosa 400 mmol/L de formiato de amônio na composição do solvente A. Para o preparo de amostra, foram examinados diferentes solventes orgânicos e suas misturas, para a precipitação de proteínas da urina. O isopropanol foi o solvente apresentou os melhores resultados para o preparo de amostra. Dessa forma, com o método analítico otimizado, as amostras de urina de camundongos fêmeas prenhas foram submetidas à analise metabolômica global por HILIC-MS. O metaboloma dos animais foi bastante alterado pela exposição gestacional ao material particulado. Observou-se alteração dos níveis de carnitinas, aminoácidos, peptídeos, entre outros. Há também indícios de que a poluição atmosférica alterou a microbiota intestinal dos animais, devido ao aumento de N-óxido de trimetilamina, um metabólito que também é relacionado ao processo de aterosclerose. Níveis de metabólitos relacionados ao metabolismo da histidina também foram alterados devido a exposição ao MP2,5. Níveis de carnitina e acilcarnitinas foram aumentados no teste, sugerindo alteração da produção de energia na mitocontria.
There are strong evidences regarding negative effects of gestational exposure to air pollution. However, the mechanisms of action of air pollutants are not well established. Maternal anomalous physiological changes during pregnancy may cause permanent changes in offsprings, that might initiate future diseases in adult life. Therefore, the study of those maternal changes during pregnancy is important. Metabolomics is defined as the global analysis of the metabolome of an organism in comparative studies, for the measurement of relative changes in the metabolite abundance, appearance or disappearance. Metabolomics might provide a better understanding of cellular functioning at the molecular level. In this work, an experimental study of maternal gestational exposure to fine particulate matter (PM2.5) was accomplished to evaluate the effects of this exposure to the metabolism, by an untargeted metabolomics analysis of urine from pregnant mice exposed to PM2.5 or to filtered air during pregnancy. A chromatographic and sample preparation methods for urinary untargeted metabolomics analysis by HILIC-MS were optimized. For the chromatography optimization, the influence of mobile phase additives, salt concentration and pH, as well as, the gradient ramp were investigated. The best condition was chosen by the evaluation of peak shape, relative intensity and retention time CV of 15 selected m/z, as well as, the total number of molecular features and the intensity CV of those molecular features. The best condition comprises of 20 mmol/L of ammonium formate as solvent B, and 95% acetonitrile and 5% 400 mmol/L of ammonium formate as solvent A, in the composition of the mobile phase. For the sample preparation, different solvents, along with, their mixtures were examined for the urine protein precipitation. Isopropanol was the solvent that presented the best results for sample preparation. Thus, after the analytical method optimized, urine samples from the progenitors were submitted to untargeted metabolomics analysis by HILIC-MS. The animals\' metabolome were significantly changed by the gestational exposure to particulate matter. It was observed changes in the levels of carnitines, amino acids, peptides, among others. There is some indication that the air pollution has altered the gut microbiota, due to the enhancement of trimethylamine N-oxide (TMAO), a metabolite that is also related to the atherosclerosis process. The level of metabolites related to histidine metabolism were also altered due to PM2.5 exposure. Carnitine and acylcarnitine levels were also increased in the test group, suggesting an altered energy production in the mitochondria.
Style APA, Harvard, Vancouver, ISO itp.
7

Souza, Milena Gouveia Oliveira de. "Avaliação da concentração de arsênio em partículas fracionadas por tamanho na atmosfera do Recôncavo Baiano". reponame:Repositório Institucional da UFBA, 2011. http://www.repositorio.ufba.br/ri/handle/ri/10027.

Pełny tekst źródła
Streszczenie:
106f.
Submitted by Ana Hilda Fonseca (anahilda@ufba.br) on 2013-04-03T15:25:41Z No. of bitstreams: 1 TESE FINAL DOC.pdf: 4610258 bytes, checksum: 3ecdb7656f48c692cf6c27ab84dec013 (MD5)
Approved for entry into archive by Ana Hilda Fonseca(anahilda@ufba.br) on 2013-04-23T15:52:10Z (GMT) No. of bitstreams: 1 TESE FINAL DOC.pdf: 4610258 bytes, checksum: 3ecdb7656f48c692cf6c27ab84dec013 (MD5)
Made available in DSpace on 2013-04-23T15:52:10Z (GMT). No. of bitstreams: 1 TESE FINAL DOC.pdf: 4610258 bytes, checksum: 3ecdb7656f48c692cf6c27ab84dec013 (MD5) Previous issue date: 2011
CNPQ
Atualmente, um dos maiores problemas mundiais é a poluição atmosférica, oriunda essencialmente de fontes antrópicas. Os grandes impactos ambientais, como a degradação da qualidade do ar, são resultados dos processos de desenvolvimento urbano e industrial. O material particulado (MP) tem sido alvo de vários estudos devido aos efeitos nocivos causados ao meio ambiente e a saúde humana. O arsênio, um metalóide que apresenta características tanto de metal como de não-metal, é considerado altamente tóxico. A associação do arsênio ao material particulado pode provocar sérios danos à saúde da população. Os níveis de toxicidade do arsênio são dependentes de sua forma química. As espécies inorgânicas de arsênio, arsenito (AsIII) e arseniato (AsV), são também consideradas agentes carcinogênicos. O Recôncavo Baiano é uma região que apresenta grande importância ambiental, social e econômica para o estado da Bahia. Nesta área encontram-se portos, terminais marítimos e diversos pólos industriais que são as principais fontes de emissão de poluentes para o meio ambiente. O presente trabalho teve por objetivo verificar a concentração do arsênio presentes tanto nas partículas finas, quanto nas partículas grossas do material particulado atmosférico do Recôncavo Baiano, para avaliar as contribuições deste poluente à saúde da população exposta. A determinação de arsênio em material particulado, utilizando a digestão, com HNO3, e a técnica de espectrometria de fluorescência atômica acoplada à geração de hidreto (HG-AFS), mostrou-se eficiente para a matriz estudada com limite de detecção e quantificação de 0,3 ng m-3 e 1 ng m-3, respectivamente. As concentrações médias de arsênio, obtidas no material particulado em algumas regiões do Recôncavo Baiano, estavam em torno de 30 ng m-3, valor cinco vezes maior que o recomendado pela União Européia (6 ng m-3). O arsênio presente no material particulado encontra-se substancialmente nas partículas finas. Alertando para os riscos de exposição da população, nos municípios onde foram feitas as amostragens. Os resultados apresentados neste trabalho são indicativos da necessidade de se atualizar os padrões de qualidade do ar para o Brasil, incluindo outros poluentes como o arsênio
Salvador
Style APA, Harvard, Vancouver, ISO itp.
8

Chang, Hong. "Hydraulic Fracturing in Particulate Materials". Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4957.

Pełny tekst źródła
Streszczenie:
For more than five decades, hydraulic fracturing has been widely used to enhance oil and gas production. Hydraulic fracturing in solid materials (e.g., rock) has been studied extensively. The main goal of this thesis is a comprehensive study of the physical mechanisms of hydraulic fracturing in cohesionless sediments. For this purpose, experimental techniques are developed to quantify the initiation and propagation of hydraulic fractures in dry particulate materials. We have conducted a comprehensive experimental series by varying such controlling parameters as the properties of particulate materials and fracturing fluids, boundary conditions, initial stress states, and injection volumes and rates. In this work, we suggest principle fundamental mechanisms of hydraulic fracturing in particulate materials and determine relevant scaling relationships (e.g., the interplay between elastic and plastic processes). The main conclusion of this work is that hydraulic fracturing in particulate materials is not only possible, but even probable if the fluid leak-off is minimized (e.g., high flow rate, high viscosity, low permeability). Another important conclusion of this work is that all parts of the particulate material are likely to be in compression. Also, the scale effect (within the range of the laboratory scales) appears to be relatively insignificant, that is, the observed features of fractures of different sizes are similar. Based on the observed fracture geometries, and injection pressures we suggested three models of hydraulic fracturing in particulate materials. In the cavity expansion or ??e driving model, the fracturing fluid is viewed as a sheet pile (blade) that disjoints the host material, and the cavity expansion occurs at the fracture (blade) front. The shear banding model is also consistent with a compressive stress state everywhere in the particulate material and explains the commonly observed beveled fracture front. The model of induced cohesion is based on the fluid leak-off ahead of the fracture front. The induced cohesion may be caused by the tensile strain near the fracture tip (where the stress state is also compressive), which, in turn, induces the cavitation of the leaked-off fluid and hence capillary forces.
Style APA, Harvard, Vancouver, ISO itp.
9

Johnston, Nicola Jane. "Particulate production during dental procedures". Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492647.

Pełny tekst źródła
Streszczenie:
The objectives of this investigation were to determine particulate production during routine clinical orthodontic and dental laboratory procedures and to investigate what factors can be employed to minimise exposure to such dust particles.
Style APA, Harvard, Vancouver, ISO itp.
10

Wang, Huaijun. "Creating Virtual Wood Particulate Composites". Fogler Library, University of Maine, 2000. http://www.library.umaine.edu/theses/pdf/Wang.pdf.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
Więcej źródeł

Książki na temat "Particulate"

1

Particulate. Cohasset, Calif: Bear Star Press, 2003.

Znajdź pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
2

Drew, Donald A., Daniel D. Joseph i Stephen L. Passman, red. Particulate Flows. New York, NY: Springer New York, 1998. http://dx.doi.org/10.1007/978-1-4684-7109-0.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
3

German, Randall M. Particulate Composites. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29917-4.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
4

Wu, Chuan-Yu, i Wei Ge, red. Particulate Materials. Cambridge: Royal Society of Chemistry, 2011. http://dx.doi.org/10.1039/9781849735148.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
5

Merkus, Henk G., i Gabriel M. H. Meesters, red. Particulate Products. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-00714-4.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
6

Elisabeth, Guazzelli, Oger Luc i NATO Advanced Study Institute on Mobile Particulate Systems (1994 : Cargése, France), red. Mobile particulate systems. Dordrecht: Kluwer Academic Publishers, 1995.

Znajdź pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
7

Engineers, Society of Automotive, i SAE International Congress & Exposition (1985 : Detroit, Mich.), red. Diesel particulate control. Warrendale, PA: Society of Automotive Engineers, 1985.

Znajdź pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
8

Sonwani, Saurabh, i Anuradha Shukla, red. Airborne Particulate Matter. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-5387-2.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
9

Harrison, R. M., R. E. Hester i Xavier Querol, red. Airborne Particulate Matter. Cambridge: Royal Society of Chemistry, 2016. http://dx.doi.org/10.1039/9781782626589.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
10

Guazzelli, Elisabeth, i Luc Oger, red. Mobile Particulate Systems. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8518-7.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
Więcej źródeł

Części książek na temat "Particulate"

1

Gooch, Jan W. "Particulate". W Encyclopedic Dictionary of Polymers, 519. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8438.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
2

German, Randall M. "Introduction". W Particulate Composites, 1–22. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29917-4_1.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
3

German, Randall M. "Optimization". W Particulate Composites, 333–61. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29917-4_10.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
4

German, Randall M. "Applications". W Particulate Composites, 363–412. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29917-4_11.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
5

German, Randall M. "Prospects". W Particulate Composites, 413–25. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29917-4_12.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
6

German, Randall M. "Background Definitions". W Particulate Composites, 23–34. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29917-4_2.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
7

German, Randall M. "Analysis Techniques". W Particulate Composites, 35–81. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29917-4_3.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
8

German, Randall M. "Property Models". W Particulate Composites, 83–135. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29917-4_4.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
9

German, Randall M. "Constituents". W Particulate Composites, 137–75. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29917-4_5.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
10

German, Randall M. "Powder Selection". W Particulate Composites, 177–223. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29917-4_6.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.

Streszczenia konferencji na temat "Particulate"

1

Murugaiah, Anand. "Particulate fiber composites - Effect of particulates on fiber composite strength". W 38th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2000. http://dx.doi.org/10.2514/6.2000-15.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
2

Woolford, Kirk A., i Carlos Guedes. "Particulate matters". W the 15th international conference. New York, New York, USA: ACM Press, 2007. http://dx.doi.org/10.1145/1291233.1291392.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
3

Cunningham, Patrick J., i Peter H. Meckl. "Measuring Particulate Load in a Diesel Particulate Filter". W SAE 2006 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2006. http://dx.doi.org/10.4271/2006-01-0868.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
4

Muscari, J. A. "Particulate Contamination Control". W 30th Annual Technical Symposium, redaktor Robert P. Breault. SPIE, 1987. http://dx.doi.org/10.1117/12.939505.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
5

Richards, Paul, i W. Kalischewski. "Retrofitting of Diesel Particulate Filters - Particulate Matter and Nitrogen Dioxide". W 2003 JSAE/SAE International Spring Fuels and Lubricants Meeting. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2003. http://dx.doi.org/10.4271/2003-01-1883.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
6

Cheong, Brandon H. "Small volume particulate and non-particulate sample collection for fluidic systems". W SPIE Micro+Nano Materials, Devices, and Applications, redaktorzy James Friend i H. Hoe Tan. SPIE, 2013. http://dx.doi.org/10.1117/12.2033733.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
7

Dinesen, Jørgen, Steen Søndergaard Nissen i Henrik Christensen. "Electrochemical Diesel Particulate Filter". W International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1998. http://dx.doi.org/10.4271/980547.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
8

Barataud, C., S. Bardon, B. Bouteiller, V. Gleize, A. Charlet i P. Higelin. "Diesel Particulate Filter Optimization". W SAE 2003 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2003. http://dx.doi.org/10.4271/2003-01-0376.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
9

Högström, Richard, Hannu Vesala i Martti Heinonen. "Particulate content of biogas". W 18th International Congress of Metrology, redaktor Cosimi Corletto. Les Ulis, France: EDP Sciences, 2017. http://dx.doi.org/10.1051/metrology/201708002.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
10

Weiglhofer, Werner S. "Homogenization of particulate materials". W International Symposium on Optical Science and Technology, redaktorzy Akhlesh Lakhtakia, Werner S. Weiglhofer i Russell F. Messier. SPIE, 2000. http://dx.doi.org/10.1117/12.390574.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.

Raporty organizacyjne na temat "Particulate"

1

Stanley J. Miller i Grant L. Schelkoph. ADVANCED HYBRID PARTICULATE COLLECTOR. Office of Scientific and Technical Information (OSTI), listopad 1998. http://dx.doi.org/10.2172/780830.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
2

Stanley J. Miller, Grant L. Schelkoph i Grant E. Dunham. ADVANCED HYBRID PARTICULATE COLLECTOR. Office of Scientific and Technical Information (OSTI), grudzień 2000. http://dx.doi.org/10.2172/783187.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
3

Grant L. Schelkoph i Stanley J. Miller. ADVANCED HYBRID PARTICULATE COLLECTOR. Office of Scientific and Technical Information (OSTI), lipiec 1999. http://dx.doi.org/10.2172/14450.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
4

Zhuang, Ye, Stanley J. Miller, Michelle R. Olderbak i Rich Gebert. ADVANCED HYBRID PARTICULATE COLLECTOR. Office of Scientific and Technical Information (OSTI), grudzień 2001. http://dx.doi.org/10.2172/794324.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
5

Patrick Treado, Oksana Klueva i Jeffrey Beckstead. Airborne Particulate Threat Assessment. Office of Scientific and Technical Information (OSTI), grudzień 2008. http://dx.doi.org/10.2172/966354.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
6

Stanley J. Miller i Grant L. Schelkoph. ADVANCED HYBRID PARTICULATE COLLECTOR. Office of Scientific and Technical Information (OSTI), kwiecień 1999. http://dx.doi.org/10.2172/761108.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
7

Stanley Miller, Rich Gebert i William Swanson. ADVANCED HYBRID PARTICULATE COLLECTOR. Office of Scientific and Technical Information (OSTI), listopad 1999. http://dx.doi.org/10.2172/761109.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
8

Parks, James, Vitaly Y. Prikhodko, Alex Sappok, Paul Ragaller i Leslie Bromberg. Radio Frequency Sensing of Particulate Matter Accumulation on a Gasoline Particulate Filter. Office of Scientific and Technical Information (OSTI), październik 2016. http://dx.doi.org/10.2172/1335361.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
9

Ashley D. Williamson. SOUTHERN FINE PARTICULATE MONITORING PROJECT. Office of Scientific and Technical Information (OSTI), kwiecień 2001. http://dx.doi.org/10.2172/788931.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
10

Williamson, Ashley D. SOUTHERN FINE PARTICULATE MONITORING PROJECT. Office of Scientific and Technical Information (OSTI), październik 2001. http://dx.doi.org/10.2172/791700.

Pełny tekst źródła
Style APA, Harvard, Vancouver, ISO itp.
Możesz być także zainteresowany rozszerzonymi bibliografiami na temat „Particulate” dla poszczególnych typów źródeł:
Artykuły w czasopismach Rozprawy doktorskie Książki
Oferujemy zniżki na wszystkie plany premium dla autorów, których prace zostały uwzględnione w tematycznych zestawieniach literatury. Skontaktuj się z nami, aby uzyskać unikalny kod promocyjny!

Do bibliografii