Bibliografías temáticas / Sulfur vapor

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Literatura académica sobre el tema "Sulfur vapor"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 2 de febrero de 2022

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Artículos de revistas sobre el tema "Sulfur vapor"

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Pokrovski, Gleb S., Jacques Roux, and Jean-Claude Harrichoury. "Fluid density control on vapor-liquid partitioning of metals in hydrothermal systems." Geology 33, no. 8 (2005): 657–60. http://dx.doi.org/10.1130/g21475ar.1.

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Abstract Hot aqueous fluids, both vapor and saline liquid, are primary transporting media for metals in hydrothermal-magmatic systems. Despite the growing geological evidence that the vapor phase, formed through boiling of magmatic ore-bearing fluids, can selectively concentrate and transport metals, the physical-chemical mechanisms that control the metal vapor-liquid fractionation remain poorly understood. We performed systematic experiments to investigate the metal vapor-liquid partitioning in model water-salt-gas systems H2O-NaCl-KCl-HCl at hydrothermal conditions. Measurements show that equilibrium vapor-liquid fractionation patterns of many metals are directly related to the densities of the coexisting vapor and liquid phases. Despite differences in the vapor-phase chemistry of various metals that form hydroxide, chloride, or sulfide gaseous molecules of contrasting volatile properties, water-solute interaction is a key factor that controls the metal transfer by vapor-like fluids in Earth's crust. These findings allow quantitative prediction of the vapor-liquid distribution patterns and vapor-phase metal transport in a wide range of conditions. Our density model accounts well for the vapor-brine distribution patterns of Na, Si, Fe, Zn, As, Sb, and Ag observed in fluid inclusions from magmatic-hydrothermal deposits. For Au and Cu, the partitioning in favor of the liquid phase, predicted in a sulfur-free system, contrasts with the copper and gold enrichment observed in natural vapor-like inclusions. The formation of stable complexes of Cu and Au with reduced sulfur may allow for their enhanced transport by sulfur-enriched magmatic-hydrothermal vapors.
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Wada, Hiroaki. "Sulfur Pressure Control in an H2–Sulfur Vapor System." Bulletin of the Chemical Society of Japan 62, no. 9 (1989): 3010–11. http://dx.doi.org/10.1246/bcsj.62.3010.

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Перевертайло, Володимир Володимирович, А. Кузьмичєв, and А. В. Мумладзе. "Microwave gas-discharge sulfur vapor lamp." Electronics and Communications 20, no. 5 (2016): 15–21. http://dx.doi.org/10.20535/2312-1807.2015.20.5.69930.

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Lenain, P., E. Picquenard, J. L. Lesne, and J. Corset. "Raman spectra of overheated sulfur vapor." Journal of Molecular Structure 142 (March 1986): 355–58. http://dx.doi.org/10.1016/0022-2860(86)85132-8.

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Chang, Jing, Ming Dong Han, and Hong Jing Tian. "Simulation of a Novel Chemical Looping System for Recovering Elemental Sulfur from Acid Gases Using Ca-Based Oxygen Carriers." Advanced Materials Research 724-725 (August 2013): 1136–39. http://dx.doi.org/10.4028/www.scientific.net/amr.724-725.1136.

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In this paper, a novel chemical-looping process is developed for converting sulfur dioxide (SO2) in the flue gas generated from industries to elemental sulfur using Ca-based oxygen carriers. The system is mainly composed of a bubbling bed gasifier, a bubbling bed reactor and a circulating fluidized bed reactor. The high-purity sulfur vapor can be obtained from the reaction between SO2 and calcium sulfide and then be cooled into solid sulfur particles. From the thermodynamic analysis, the reactions between CaS and SO2 is much more easier to reach equilibrium than Claus reaction between H2S and SO2. When the temperature ranges from 500 to 600 °C, the major sulfur vapor is diatomic sulfur vapor while the solid product is mainly CaSO4, representing the regenerating of the oxygen carrier. In the system, the required heat in the coal gasification comes from the strongly exothermic oxidation of oxygen carrier, by circulating the oxygen carrier particles in the system. The effects of reacting temperature, SO2/CaS molar ratio on the yield of sulfur particle and conversion of SO2 to elemental sulfur are all discussed. The favorable temperature of the reactor to generate elemental sulfur should be between 500 and 600 °C.
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Hakimi, Mahdieh, Asa Borzabadi Farahani, Zeinab Sanaee, Shahnaz Ghasemi, and Shams Mohajerzadeh. "Preparation of sulfur micro-particles suitable for lithium sulfur batteries using sulfur vapor deposition." Materials Research Express 6, no. 10 (2019): 105514. http://dx.doi.org/10.1088/2053-1591/ab3963.

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Abe, S., and K. Masumoto. "Faceted vapor grown PbS single crystals under different sulfur vapor pressures." Journal of Crystal Growth 249, no. 3-4 (2003): 544–48. http://dx.doi.org/10.1016/s0022-0248(02)02356-4.

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Guan, Ran, Junxi Duan, Aiheng Yuan, et al. "Chemical vapor deposition of clean and pure MoS2 crystals by the inhibition of MoO3−x intermediates." CrystEngComm 23, no. 1 (2021): 146–52. http://dx.doi.org/10.1039/d0ce01354d.

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A sublimated sulfur vapor versus evaporated MoO3 vapor with transition from low to high sulfur supersaturation would cause different CVD products transformed from MoS2–MoO3−x composites to clean and pure MoS2 crystals accordingly.
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Adlim, Muhammad, Fitri Zarlaida, Ibnu Khaldun, Rizka Dewi, Sofyatuddin Karina, and Ahmad Fairuz Omar. "Immobilization of Sulfur from Different Precursors on Mini Rice-Husk-Ash Pellet Coated Chitosan Film and the Application for Mercury Vapor Uptake." Indonesian Journal of Chemistry 19, no. 2 (2019): 386. http://dx.doi.org/10.22146/ijc.34552.

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Stabilizing elemental mercury using elemental sulfur has been a laboratory standard method but the studies in gas system are still growing. This study aims to explore the effect of different type immobilized sulfurs toward the mercury vapor uptake in a mini gas reactor. Sulfur powder, sulfur dissolved in carbon disulfide and colloidal sulfur from sodium thiosulfate-hydrochloric acid were immobilized on mini rice-husk-ash pellets that were previously coated with chitosan film. The average thinness of chitosan film was 58 µm covered the each pellet surface with dimension of 3 mm Ø x 4 mm. The trends of the mercury uptake and the rate of absorption were described as follow; Pellet-Scolloid > Pellet-SCS2 > Pellet-Spowder. The mean percentages of mercury uptake after 1 h running at 70oC were 99.36; 89.09 and 75.00 respectively. The reverse trends were observed for the size of S-particle aggregation and the amount of S found on the pellet surface.
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Kim, Do Heung, Wontae Jang, Keonwoo Choi, et al. "One-step vapor-phase synthesis of transparent high refractive index sulfur-containing polymers." Science Advances 6, no. 28 (2020): eabb5320. http://dx.doi.org/10.1126/sciadv.abb5320.

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High refractive index polymers (HRIPs) have recently emerged as an important class of materials for use in a variety of optoelectronic devices including image sensors, lithography, and light-emitting diodes. However, achieving polymers having refractive index exceeding 1.8 while maintaining full transparency in the visible range still remains formidably challenging. Here, we present a unique one-step vapor-phase process, termed sulfur chemical vapor deposition, to generate highly stable, ultrahigh refractive index (n > 1.9) polymers directly from elemental sulfur. The deposition process involved vapor-phase radical polymerization between elemental sulfur and vinyl monomers to provide polymer films with controlled thickness and sulfur content, along with the refractive index as high as 1.91. Notably, the HRIP thin film showed unprecedented optical transparency throughout the visible range, attributed to the absence of long polysulfide segments within the polymer, which will serve as a key component in a wide range of optical devices.
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Tesis sobre el tema "Sulfur vapor"

1

Suleiman, Shady H. "Microwave effects of gaseous sulfur dioxide (SO₂) in the atmospheres of Venus and Earth." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/13325.

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Baxter, Nichelle Lynn. "Magmatic Sulfur and Chlorine Abundances at Stromboli, Italy and their Role in the Formation of Vesicle-hosted Metal Alloys." BYU ScholarsArchive, 2008. https://scholarsarchive.byu.edu/etd/1542.

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Strand et al. (2002) discovered small metal alloy grains rich in Cu, Co, and Sn (maximum size 150 µm) in vesicles of lava from Kilauea Volcano. These alloys are also found in basaltic rocks of several Italian volcanoes. To better understand the origin of these metal-rich grains, bombs from Stromboli Volcano were examined. Two bomb types were collected from Stromboli: pumiceous bombs and scoriaceous bombs. Bulk rock trace element geochemistry indicates that there are no significant differences in Cu, Co, or Sn (the three major components of the metal alloys) between the pumiceous and scoriaceous bombs. Comparison of olivine melt inclusion and matrix glass concentrations from these rocks shows that the pumiceous bombs are more primitive (melt inclusions: MgO 2.7-5.8 wt. %; matrix glass: MgO 5.1-6.50 wt. %) and are more S-rich (melt inclusions: maximum 0.13 wt. %; matrix glass: maximum 0.06 wt. % ) than the scoriaceous bombs. The melt inclusions and matrix glass in the scoriaceous bombs are more evolved (melt inclusions: MgO 3.0-4.3 wt. %; matrix glass: MgO 2.7-3.7 wt. %) and are S-poor (melt inclusions: maximum 0.06 wt. %; matrix glass: b.d.l. ). However, Cl concentrations in melt inclusions and matrix glass are more similar for both bomb types. Metal alloys were counted in thin section for each sample. The crystallized interiors of the bombs contain more metal grains than the glassy exteriors. Pumiceous bombs (from more primitive, S-rich magma) contain more metal grains of a larger size than the scoriaceous bombs (from more fractionated, S-poor magma). This indicates that S (and Cl) are probable transport ligands for the metals in the alloys. As S (and Cl) move through the glass of an erupted cooling bomb, they complex with volatile chalcophile metals (Cu, Co, and Sn). These vapor-phase metal sulfides and chlorides move to inflating vesicles. Here the sulfide and chloride complexes become reduced and metal alloys condense, as S and Cl escape as gas. Non-degassed primitive magma may provide more S (but not necessarily more metals) to create the higher abundance of alloys hosted by the vesicles of the pumiceous bombs.
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Lin, Tien-Chih 1966. "Interactions of Clean and Sulfur-modified Reactive Metal Surfaces with Aqueous Vapor and Liquid Environments : A Combined Ultra-high Vacuum/electrochemistry Study." Thesis, University of North Texas, 1998. https://digital.library.unt.edu/ark:/67531/metadc278914/.

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The focus of this research is to explore the molecular-level interactions between reactive metal surfaces and aqueous environments by combined ultra-high vacuum/electrochemistry (UHV-EC) methodology. The objectives of this work are to understand (1) the effects of sulfate ions on the passivity of metal oxide/hydroxide surface layer, (2) the effects of sulfur-modification on the evolution of metal oxide/hydroxide surface layer, and (3) the effects of sulfur adsorbate on cation adsorption at metal surfaces.
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Zhang, Lu. "Study of Novel Graphene Structures for Energy Storage Applications." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479823012280305.

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Waite, Adam Richard. "Effects of Fundamental Processing Parameters on the Structure and Composition of Two-Dimensional MoS2 Films." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton149315978414366.

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Neuschitzer, Markus. "Development of Cu2ZnSnSe4 Based Thin Film Solar Cells by PVD and Chemical Based Processes." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/400489.

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Nowadays mono- and multicrystalline silicon have the highest market share of all PV technologies but thin film solar cells based on CdTe or Cu(In,Ga)Se2 (CIGS) absorbers recently show promising high power conversion efficiency values and due to their short energy payback time, minimal use of high purity material and low cost, they attract more and more attention. However, one concern of thin film PV based on CdTe or CIGS is the use of scare elements like tellurium or indium and gallium which could become a bottleneck if the technology wants to scale up to the terawatt level. Therefore, there is a high interest to replace these scare elements by more abundant ones and find suitable earth abundant photovoltaic absorbers. Cu2ZnSnSe4 (CZTSe) or Cu2ZnSnS4 (CZTS) and its sulphur-selenide solid solution are promising candidates to replace CIGS as absorber material due to its composition of more earth abundant elements. In literature CZTSe and CZTS are referred to as kesterite due to its crystal structure. However, there is still a large gap between power conversion efficiencies of solar cells based on kesterite absorber material and more established thin film solar cells, thus intensive research is still necessary to close this gap. The main goal of this thesis was to develop and optimize heterostructure solar cells based on Cu2ZnSnSe4 absorbers, by cost effective physical vapour deposition (PVD) and chemical based processes. Special focus is put on an improved understanding of the influence of the surface properties of kesterite absorbers on device performance and furthermore to optimize the front interface, i.e. buffer layer as well as the kesterite absorber layer itself. A detailed study investigating the influence of the surface chemistry on device performance is presented. After a chemical etching to remove unwanted ZnSe secondary phases formed during CZTSe absorber synthesis a low temperature post deposition annealing at 200ºC of the full solar cell is necessary to improve device efficiencies from below 3% to over 8%. X-ray photoelectron spectroscopy (XPS) surface analysis showed that this post deposition annealing promotes the diffusion of Zn towards the surface and Cu towards the bulk resulting in a Zn enriched and Cu depleted surface region, which is crucial for high device performance. Additionally experimental surface treatments confirm the necessity of a Cu-poor and Zn-rich surface and the reason for this beneficial surface composition are discussed in detail. Furthermore, the CdS buffer layer which is typically used in kesterite based heterostructures solar cells was optimized and allowed improvements in device performance of 1% absolute. This optimization was further extended to Cd-free ZnS(O,OH) buffer layer. Efficiencies close to that of CdS reference solar cells could be achieved using optimized ZnS(O,OH) buffer layer. Additionally to the front interface optimization, a Ge assisted crystallization process for nanocrystalline CZTSe precursors was developed which largely increase grain growth and boost open circuit voltages (Voc) to promising high values due to the elimination of deep defects. Since the low Voc values is identified of one of the main bottlenecks of kesterite technology, the improvements achieved are highly promising and give important insight for further possible optimizations.
Los compuestos Cu2ZnSnSe4 (CZTSe), Cu2ZnSnS4 (CZTS) y Cu2ZnSnSexS4-x (CZTSSe) también conocidos como kesteritas debido a su estructura, presentan propiedades prometedoras para sustituir a la tecnología de células solares de capa fina basadas en Cu(In,Ga)Se2, evitando el problema potencial que podría generar el uso de indio y galio. A día de hoy, las eficiencias obtenidas en dispositivos de CIGS, son bastante mayores que las reportadas para dispositivos de kesteritas, debido entre otras razones a la diferencia en la madurez de dicha tecnología. Por lo tanto, es necesario un estudio más profundo de los materiales y dispositivos basados en kesteritas, enfocado a aumentar los valores de eficiencia de los dispositivos. El objetivo principal de esta Tesis Doctoral es el desarrollo y optimización de células solares con capas absorbentes basadas en el compuesto CZTSe por métodos de bajo coste incluyendo procesos de deposición física en fase vapor, así como también por procesos químicos. Se ha prestado especial interés en aumentar el conocimiento sobre la influencia de las propiedades de la superficie de la capa absorbente en el funcionamiento de las células solares. Estos estudios incluyen la optimización de la capa de kesterita, y también de su interfaz con la capa “buffer” o semiconductor tipo n en la heterounión. Se incluye un estudio detallado de la influencia de las propiedades químicas de la superficie del absorbente en la eficiencia de los dispositivos. Además, se presentan los estudios de optimización de la capa buffer basada en CdS y de capas buffer libres de Cd, usando como alternativa ZnS(O,OH), donde se obtuvieron eficiencias comparables con las de los dispositivos de referencia fabricados con CdS. Finalmente, se presenta un estudio de recristalización asistida por una capa nanométrica de Ge depositada en los precursores nano cristalinos. Se demuestra que este proceso induce un aumento significativo del crecimiento de los granos del absorbedor, reduciendo la presencia de defectos profundos eléctricamente activos que resultan perjudiciales para las propiedades de los dispositivos fotovoltaicos. Las mejoras presentadas en este estudio son altamente prometedoras y conducen hacia nuevas rutas de optimización en la fabricación de estos dispositivos.
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Lima, Thiago de Melo. "Oxidação de CO sobre catalisadores de Co e/ou Mn modificados com Mo e suportados em SBA-15 – Efeito do método de preparação e da presença de vapor de água e dióxido de enxofre na atividade catalítica." Universidade Federal de São Carlos, 2016. https://repositorio.ufscar.br/handle/ufscar/8569.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
The increasing demand for oil and oil derived products contributed to the alarming increase in the gaseous pollutants emissions in general and mainly contributed to the increase in carbon monoxide (CO) emissions in the worldwide. Besides being delivered on fossil fuels burning processes, a large amount of CO is also generated during the oil refining process, especially in the fluid catalytic cracking unit (FCC). In order to reduce the costs associated to the CO oxidation catalysts many efforts have been devoted to substitution of noble metals by non-noble transition metals, such as cobalt oxides and manganese oxides. However, the biggest challenge for this replacement is to keep the activity of these catalysts in the presence of interfering agents, such as SO2 and H2O, which might deactivate the catalysts or even inhibit the CO oxidation reaction. In this context, the aim of this study is to evaluate the activity of cobalt and/or manganese catalysts, promoted or not by molybdenum and supported on mesoporous molecular sieve type SBA-15 in the CO oxidation reaction in the presence of SO2 (450 ppm) and H2O (10% V/V). These catalysts were prepared by three different methods: (i) impregnation, (ii) deposition-precipitation using microwave and (iii) one-pot. It is noteworthy that the catalysts prepared by the methods of deposition-precipitation and one-pot represents a major breakthrough regarding to green synthesis methods, since they allowed representative savings of energy and water. It was found that the one-pot and deposition-precipitation methods yielded catalysts with high dispersion of the active phase and quite active in CO oxidation reaction. Furthermore, analysis of XRD, Raman, EPR, UV-Vis, XPS and H2-TPR revealed that the one-pot method yielded better dispersion of the molybdenum species over the SBA-15 support, which provided excellent resistance to the cobalt and/or manganese catalysts to SO2 and H2O poisoning. Moreover, the catalysts promoted by molybdenum and prepared by the deposition-precipitation method were composed by cobalt or manganese molybdates, as indicated by XRD, Raman, UV-Vis and XPS techniques, which are less active in the CO oxidation reaction. The catalysts promoted by molybdenum and prepared by the impregnation method possessed a smaller dispersion of the promoter, with the formation of molybdenum oxide, and thus reducing the resistance of these catalysts in the presence of the interfering agents.
A crescente demanda por petróleo e seus derivados contribuiu para o alarmante aumento das emissões de poluentes gasosos de um modo geral e principalmente contribuiu para o aumento das emissões do monóxido de carbono (CO) em todo o mundo. Além de ser emitido em processos de queima de combustíveis fósseis, grande quantidade de CO também é gerada durante o processo de refino do petróleo, principalmente na unidade de craqueamento catalítico em leito fluido (FCC). Com o objetivo de reduzir os custos associados aos catalisadores de oxidação do CO diversos esforços têm sido dedicados para a substituição dos metais nobres por metais de transição não nobres, tais como óxidos de cobalto e óxidos de manganês. Entretanto, o maior desafio para esta substituição é manter a atividade destes catalisadores na presença dos agentes interferentes, SO2 e H2O, que atuam desativando estes catalisadores ou mesmo inibindo a reação de oxidação do CO. Neste contexto, o objetivo geral deste trabalho é avaliar a atividade de catalisadores de cobalto e/ou manganês, modificados ou não por molibdênio e suportados em peneira molecular mesoporosa tipo SBA-15 na reação de oxidação do CO na presença de SO2 (450 ppm) e H2O (10 % V/V). Estes catalisadores foram preparados por três diferentes métodos: (i) impregnação, (ii) deposição-precipitação utilizando micro-ondas e (iii) one-pot. Vale ressaltar que os catalisadores preparados pelos métodos de deposição-precipitação e one-pot representam um grande avanço no que se diz respeito a métodos verdes de síntese, pois permitiram grande economia de energia e de água. Foi constatado que os métodos one-pot e deposição-precipitação renderam catalisadores com elevada dispersão das fases ativas e bem ativos na reação de oxidação do CO. Além disso, as análises de DRX, Raman, EPR, UV-Vis, XPS e H2-RTP revelaram que o método one-pot rendeu a melhor dispersão das espécies de molibdênio sobre o suporte de SBA-15, que conferiu excelente resistência aos catalisadores de cobalto e/ou manganês ao envenenamento por SO2 e H2O. Por outro lado, os catalisadores modificados por molibdênio e preparados pelo método de deposição-precipitação foram compostos por molibdatos de cobalto ou manganês, conforme indicado pelas técnicas de DRX, Raman,UV-Vis e XPS, fase menos ativa na reação de oxidação do CO. Além disso, os catalisadores preparados pelo método de impregnação e modificados por molibdênio possuíram menor dispersão do metal promotor, com formação de óxido de molibdênio, e, reduzindo assim, a resistência destes catalisadores na presença dos agentes interferentes.
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Kolodner, Marc Alan. "Microwave remote sensing of sulfuric acid vapor in the Venus atmosphere." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/30081.

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Dianne, Soule Melissa C. Kido. "Nonlinear vibrational spectroscopic studies of the absorption and orientation of environmentally important molecules at the vapor/water interface /." view abstract or download file of text, 2007. http://proquest.umi.com/pqdweb?did=1335361671&sid=2&Fmt=2&clientId=11238&RQT=309&VName=PQD.

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Thesis (Ph. D.)--University of Oregon, 2007.
Typescript. Includes vita and abstract. Includes bibliographical references (leaves 146-156). Also available for download via the World Wide Web; free to University of Oregon users.
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10

Esteves, Paula Julião. "Pré-tratamento do bagaço de cana-de-açúcar com H2SO4 diluído em reator piloto aquecido por vapor direto." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/97/97132/tde-24102012-121506/.

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O presente trabalho teve como objetivo avaliar como algumas condições de pré-tratamento de bagaço de cana-de-açúcar com H2SO4 diluído influenciam a distribuição granulométrica do bagaço de cana, a composição química dos sólidos pré-tratados e hidrolisados hemicelulósicos, além da digestibilidade enzimática dos sólidos pré-tratados. Para isso, previamente, uma amostra de bagaço de cana-de-açúcar in natura foi caracterizada quanto suas composições percentuais; a distribuição granulométrica de suas fibras também foi avaliada antes e após o pré-tratamento. O pré-tratamento do bagaço com H2SO4 diluído foi realizado em reator piloto, aquecido por vapor direto, com capacidade de 100 L, onde o teor inicial de sólidos foi fixado em 15% (p/p). A temperatura (131,91-168,09 °C), tempo de residência (11,90-48,09 min) e concentração ácida (0,19 - 3,81 p/p) variaram de acordo com um planejamento fatorial 23. Após o pré-tratamento, os bagaços pré-tratados e hidrolisados hemicelulósicos foram caracterizados quanto suas composições químicas. A composição química dos bagaços in natura e pré-tratados, assim como a composição química dos hidrolisados, foi determinada por gravimetria, espectrofotometria e cromatografia líquida de alta eficiência. De acordo com a condição de pré-tratamento, os teores de celulose, hemicelulose e lignina nos bagaços pré-tratados diferiram substancialmente sendo que a maior variação foi observada para hemicelulose (0,14-17,62 %). Os três fatores avaliados no pré-tratamento influenciaram a composição química do bagaço pré-tratado, sendo que a variável com maior poder de influência no teor de celulose, hemicelulose e lignina dos sólidos foi a concentração ácida, seguida da temperatura e tempo de reação. Xilose foi o açúcar predominante nos hidrolisados hemicelulósicos variando de 1,43 a 21,05 g/L, de acordo com o planejamento. A concentração de furfural variou entre 0,08 e 4,68 g/L. Condições severas de pré-tratamento acarretaram na maior remoção de hemicelulose dos bagaços pré-tratados, porém nestas mesmas condições foram encontradas baixas concentrações de xilose e altas concentrações de furfural nos hidrolisados. A concentração de xilose no hidrolisado se mostrou dependente da temperatura e da concentração ácida. A variável com maior influência na formação de furfural foi a temperatura, seguida pela concentração ácida e tempo. A digestibilidade enzimática dos bagaços obtidos de acordo com planejamento experimental em 24 h variou de 25,35 a 63,76%, conforme a composição química dos sólidos. A temperatura de pré-tratamento foi o fator que exerceu maior influência na conversão da celulose dos sólidos. Com o intuito de avaliar o efeito da lavagem dos sólidos na digestibilidade enzimática da celulose, bagaços pré-tratados obtidos nas condições mais branda e severa de pré-tratamento, lavados e não-lavados, foram submetidos à sacarificação enzimática. A sacarificação de bagaços não-lavados foi prejudicada pela presença de inibidores nos hidrolisados hemicelulósicos, variando entre 0- 23,9%, em 72h. As condições de pré-tratamento do bagaço de cana-de-açúcar que maximizam a concentração de xilose no hidrolisado hemicelulósico e a sacarificação enzimática do bagaço pré-tratado são diferentes. O pré-tratamento com H2SO4 diluído acarretou na diminuição do tamanho das partículas do bagaço de cana.
This study aimed to evaluate how certain pretreatment conditions of sugarcane bagasse with dilute H2SO4 influence the size distribution of sugarcane bagasse, the chemical composition of solids pretreated and hemicellulosic hydrolysate, as well the enzymatic digestibility of pretreated solids. For that, previously, a sample of in natura sugarcane bagasse was characterized in terms of chemical composition; the size distribution of fibers was also evaluated before and after the pretreatment. The experiments of pretreatment of bagasse with dilute H2SO4 were conducted in a pilot reactor, heated by direct steam, with a capacity of 100 L, where the initial solids content was fixed at 15% (w / w). The temperature (131.91 to 168.09 ° C), residence time (11.90 to 48.09 min) and acid concentration (0.19 to 3.81 w / w) varied according to a factorial design 2³ . After pretreatment, the pretreated bagasse and hemicellulosic hydrolysates were characterized in terms of their chemical compositions. The chemical composition of in natura and pretreated bagasse , as well the chemical composition of the hydrolysates, was determined by gravimetry, spectrophotometry and high-efficiency liquid chromatography. According to the condition of pretreatment, cellulose, hemicellulose and lignin content in pretreated bagasse differed substantially, and the major variation was observed for hemicellulose content (0.14 to 17.62%).The three factors evaluated in the pretreatment influenced the chemical composition of pretreated bagasse, and the variable with greatest influence on the content of cellulose, hemicellulose and lignin concentration of solids was acid concentration, followed by temperature and reaction time.. Xylose was the predominant sugar in hemicellulose hydrolysates ranging from 1.43 to 21.05 g / L, according to the experimental design. Furfural concentration varied between 0.08 and 4.68 g / L. Severe conditions of pretreatment resulted in greater removal of hemicellulose from pretreated bagasse, but under these conditions were found low concentrations of xylose and high concentrations of furfural in the hydrolysates. The concentration of xylose in the hemicellulosic hydrolyzate were dependet of temperature and acid concentration. The variable with greatest influence on the formation of furfural was temperature, followed by acid concentration and time. The enzymatic digestibility of the pretreated solids, obtained according to experimental design, in 24 h, ranged from 25.35 to 63.76% depending on the chemical composition of solids. The temperature of the pretreatment was the factor that showed greater influence on the conversion of cellulose solids. In order to evaluate the effect of washing the solids in the enzymatic digestibility of cellulose, pretreated bagasses obtained in milder and severe conditions of pretreatment, non-washed and washed solids, were submitted to enzymatic saccharification. Saccharification of non-washed solids was impaired by the presence of inhibitors in hemicellulosic hydrolysates, ranging from 0 to 23.9% in 72h. The pretreatment conditions of sugarcane bagasse that maximize the concentration of xylose in the hemicellulosic hydrolyzate and enzymatic saccharification of pretreated bagasse are different. Pretreatment with dilute H2SO4 resulted in the decrease of particle size of bagasse.
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Libros sobre el tema "Sulfur vapor"

1

Office, General Accounting. Air pollution: EPA's strategy to control emissions of benzene and gasoline vapor : report to the chairman, Subcommittee on Oversight and Investigations, Committee on Energy and Commerce, House of Representatives. GAO, 1985.

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Office, General Accounting. Air pollution: Allowance trading offers an opportunity to reduce emissions at less cost : report to the Chairman, Environment, Energy, and Natural Resources Subcommittee, Committee on Government Operations, House of Representatives. The Office, 1994.

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Office, General Accounting. Air pollution: EPA should improve oversight of emissions reporting by large facilities : report to the Ranking Minority Member, Committee on Government Reform, House of Representatives. U.S. General Accounting Office, 2001.

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Office, General Accounting. Air pollution: Issues inhibiting marine vessel emission controls are still unresolved : report to the chairman, Subcommittee on Oversight and Investigations, Committee on Energy and Commerce, House of Representatives. The Office, 1988.

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Office, General Accounting. Air pollution: EPA could take additional steps to help maximize the benefits from the 2007 diesel emissions standards. United States, General Accounting Office, 2004.

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Office, General Accounting. Air pollution: Hazards of indoor radon could pose a national health problem : report. U.S. General Accounting Office, 1987.

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Office, General Accounting. Air pollution: EPA's actions to resolve concerns with the fine particulate monitoring program : report to the Chairman, Subcommittee on VA, HUD, and Independent Agencies, Committee on Appropriations, House of Representatives. The Office, 1999.

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Office, General Accounting. Air pollution: Emission sources regulated by multiple Clean Air Act provisions : report to the Chairman, Subcommittee on Clean Air, Wetlands, Private Property, and Nuclear Safety, Commmittee on Environment and Public Works, U.S. Senate. U.S. General Accounting Office, 2000.

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Office, General Accounting. Air pollution: The Border Smog Reduction Act's impact on ozone levels : report to Congressional committees. The Office, 1999.

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Office, General Accounting. Air pollution: Emissions from older electricity generating units : report to congressional committees. U.S. General Accounting Office, 2002.

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Capítulos de libros sobre el tema "Sulfur vapor"

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Sowlat, Mohammad Hossein, Mohammad Abdollahi, Hamed Gharibi, Masud Yunesian, and Noushin Rastkari. "Removal of Vapor-Phase Elemental Mercury from Stack Emissions with Sulfur-Impregnated Activated Carbon." In Reviews of Environmental Contamination and Toxicology. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04411-8_1.

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Lorenz, Robert, and Charles E. Murphy. "Sulfur Dioxide, Carbon Dioxide, and Water Vapor Flux Measurements Utilizing a Microprocessor-Controlled Data Acquisition System in A Pine Plantation." In The Forest-Atmosphere Interaction. Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5305-5_9.

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Kuang, Chongai, Peter H. McMurry, and Alon V. McCormick. "Dependence of Nucleation Rates on Sulfuric Acid Vapor Concentration in Diverse Atmospheric Locations." In Nucleation and Atmospheric Aerosols. Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6475-3_11.

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Moulin, Gérard, Katia Weulersse, and Jérôme Favergeon. "Influence of Chlorine, Sulphur and Water Vapor on High Temperature Corrosion of Fe, Cr, Ni Alloys for Waste Incinerators." In High-Temperature Oxidation and Corrosion 2005. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-409-x.547.

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"Characteristics of Discharge Spectra with Low-Pressure Sulfur Vapor." In Light Sources 2004 Proceedings of the 10th International Symposium on the Science and Technology of Light Sources. CRC Press, 2004. http://dx.doi.org/10.1201/9781482269178-256.

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Patterson, D. E., C. J. Chu, B. J. Bai, N. J. Komplin, R. H. Hauge, and J. L. Margrave. "Thermochemical Vapor Deposition of Diamond in a Carbon-Halogen-Oxygen and/or Sulfur Atmospheric Hot Wall Reactor." In Applications of Diamond Films and Related Materials - Proceedings of the First International Conference on the Applications of Diamond Films and Related Materials – ADC '91 Auburn, Alabama, U.S.A., August 17–22, 1991. Elsevier, 1991. http://dx.doi.org/10.1016/b978-0-444-89162-4.50093-2.

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Whiteman, C. David. "Air Pollution Dispersion." In Mountain Meteorology. Oxford University Press, 2000. http://dx.doi.org/10.1093/oso/9780195132717.003.0021.

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Air pollutants are harmful airborne substances (solids, liquids, or gases) that, when present in high-enough concentrations, threaten human health or welfare, harm vegetation, animals, or structures, or affect visibility. Visibility alone is not, however, a reliable indicator of the presence of pollutants. A visible plume of condensed water vapor from an industrial cooling tower decreases solar radiation and increases the frequency of fog and icy road conditions near the cooling tower, but it is not an air pollution plume because it is composed entirely of water. In contrast, an industrial pollutant plume may be nearly invisible after the gross particulate matter has been removed by pollution control equipment, but it may still contain large quantities of pollutant gases. Air pollutants can come from either natural or anthropogenic (human) sources. The distinction between the two categories is not always clear. Natural emissions include ash and dust from volcanoes, certain highly volatile chemicals from forests, aeroallergens such as ragweed pollen, wind-entrained dust from natural land surfaces, and smoke and ash from wildfires. Wind-entrained dust can, however, come from roadways or land surfaces that have been disturbed by man, some aeroallergens come from plant species introduced to a new habitat by man, and many fires are prescribed fires —natural or man-made fires (whether accidental or deliberate) that are allowed to burn in order to meet forest or land management objectives. Pollutants can be emitted directly into the atmosphere (primary pollutants] or produced in the atmosphere (secondary pollutants) as a result of chemical or physical transformations of primary pollutants when exposed to other components of air, including other pollutants or water vapor. Examples of transformations include the clumping or coagulation of small particulates into larger particles and the conversion of sulfur dioxide gas emitted from coal-fired power plants to particulate sulfates under humid conditions or to acid rain droplets if clouds are present. Some secondary pollutants, such as photochemical smog or ozone, result from photochemical reactions, that is, chemical reactions that occur only in the presence of solar radiation. Pollutants may come from point, area, or line sources; the emissions may be continuous or intermittent; and the source strength may be variable or constant.
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Actas de conferencias sobre el tema "Sulfur vapor"

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Long, Lee Tsung, Liao Meng-Chieh, Huang Te-Chun, and Luo Tzeng-Cherng. "Plating coated component creep corrosion test at sulfur vapor atmosphere." In 2014 9th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT). IEEE, 2014. http://dx.doi.org/10.1109/impact.2014.7048394.

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Bhatia, A., M. A. Karmarkar, H. Meadows, et al. "Effects of annealing in sulfur vapor on electrodeposited CuInSe2 films." In 2012 IEEE 38th Photovoltaic Specialists Conference (PVSC). IEEE, 2012. http://dx.doi.org/10.1109/pvsc.2012.6317742.

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Israelson, Gordon. "Water Vapor Effects on Fuel Cell Desulfurizer Performance: A Decade of Field Experience." In ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65131.

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Operation of Siemens solid oxide fuel cell (SOFC) units using natural gas fuel has required sulfur selective sorbents for fuel desulfurization. Experience with physical sorbents has shown varying sulfur capacity during field operation. This has been puzzling and produced great uncertainty for selection of sorbents. This mystery of changing sorbent sulfur capacity has been partially solved. Measurements of considerably variable and unexpectedly high water vapor content in pipeline natural gas supplies appears to be a major contributor to competition for sulfur adsorption sites and results in variable sorbent performance. A summary (Table 1) shows operating lifetimes of several sorbents to remove sulfur from pipeline natural gas at several field sites, spanning about one decade of experience.
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Kjemtrup, Lars, Rasmus Faurskov Cordtz, Martin Meyer, and Jesper Schramm. "Experimental Investigation of Sulfuric Acid Condensation and Corrosion Rate in Motored BUKH DV24 Diesel Engine." In ASME 2017 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icef2017-3652.

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The work conducted in this paper presents a novel experimental setup to study sulfuric acid cold corrosion of cylinder liners in large two-stroke marine diesel engines. The process is simulated in a motored light duty BUKH DV24 diesel engine where the charge air contain known amounts of H2SO4 and H2O vapor. Liner corrosion is measured as iron accumulation in the lube oil. Similarly sulfuric acid condensation is assessed by measuring the accumulation of sulfur in the lube oil. To clarify the corrosive effect of sulfuric acid the lube oil utilized for experiments is a sulfur free neutral oil without alkaline additives (Chevron Neutral Oil 600R). Iron and sulfur accumulation in the lube oil is analyzed with an Energy Dispersive X-Ray Fluorescence (ED-XRF) apparatus. Three test cases with different H2SO4 concentrations are run. Results reveal good agreement between sulfuric acid injection flow and the accumulation of both iron and sulfur in the oil.
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Zhao, Qingxun, Xiaodong Qiao, Yinshun Wang, Jing Zhang, and Zheng Yan. "Characteristic of vapor dynamic process for sulfur-doped n-type diamond films." In Photonics Asia 2004, edited by Anbo Wang, Yimo Zhang, and Yukihiro Ishii. SPIE, 2005. http://dx.doi.org/10.1117/12.573787.

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Holmes, WW, DP Fetterer, ML Conti, and DR Anderson. "Cytokine/Chemokine Profile in Bronchoalveolar Lavage (BAL) Fluid Following Acute Sulfur Mustard Vapor Inhalation Exposure." In American Thoracic Society 2009 International Conference, May 15-20, 2009 • San Diego, California. American Thoracic Society, 2009. http://dx.doi.org/10.1164/ajrccm-conference.2009.179.1_meetingabstracts.a5862.

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Pint, Cary L. "Capillary Force Guided Nanomanufacturing of Composite Materials for Advanced Battery Applications." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71738.

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This paper introduces the use of capillary thermodynamics as a powerful nanomanufacturing tool, and its specific application to infiltrate sulfur into 3-D nanostructured electrodes for advanced lithium-sulfur and/or sodium-sulfur battery development. The capillary effect specifically targets nucleation from the equilibrium vapor pressure of bulk sulfur (gas phase) onto nanoscale surfaces (liquid phase). This leads to condensates that nucleate and grow uniformly over the surface leading to self-limited and conformal composite materials moderated by the chemical potential driving force between the nanoscale nuclei and the bulk sulfur. Our studies show highly consistent and repeatable sulfur loading exceeding 80 wt.% sulfur, fast kinetics that can lead to full infiltration in ∼ 10 minutes, and synergy with pre-formed carbon materials including carbon nanotube arrays, carbon nanotube foams and sponges, and microporous carbons with pore sizes ∼ 0.5 nm. This overcomes challenges of scaling to high areal capacity in lithium-sulfur and sodium-sulfur batteries, and our results emphasize the highest reported areal capacities for solid-processed cathodes to date (> 19 mAh/cm2). This paves the route to batteries with energy density > 500 Wh/kg with reliable manufacturing processes that simultaneously sustain low cost and high throughput.
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Grishchenko, L. M., A. N. Zaderko, S. I. Chernenko, et al. "Chemical Vapor Deposition Routes for Fluorine and Sulfur-containing Activated Carbon Acid Catalysts: Comparison of Fluorination Methods." In 2020 IEEE 10th International Conference Nanomaterials: Applications & Properties (NAP). IEEE, 2020. http://dx.doi.org/10.1109/nap51477.2020.9309713.

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Khalkar, Arun, Kwang-Soo Lim, Seong-Man Yu, Jin Hyeok Kim, and Ji-Beom Yoo. "Sulfurization approach using sulfur vapor, graphite box and H2S gas atmospheres for co-sputtered Cu2ZnSnS4 thin film." In 2014 IEEE 40th Photovoltaic Specialists Conference (PVSC). IEEE, 2014. http://dx.doi.org/10.1109/pvsc.2014.6924940.

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Wain, Kimberly S., and Joseph M. Perez. "Oxidation of Biodiesel Fuels for Improved Lubricity." In ASME 2002 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ices2002-447.

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Diesel engine emissions are a source of environmental concern. The use of vegetable oil based fuels, called biodiesels, lowers particulate emissions due to the increased oxygen content of the fuel. This study aims to further increase the oxygen content of biodiesel by oxidizing the fuel, analyzing the resulting product, and determining if favorable lubricity qualities result. Oxidation is performed in a non-catalytic vapor phase reactor at temperatures between 300–400°C. The product is characterized using various analyses including sulfuric acid solubility, density, gas chromatography, bomb calorimetry, and lubricity. Optimum blend ratios of the oxidized fuels in a low sulfur diesel fuel to obtain maximum lubricity are determined.
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Informes sobre el tema "Sulfur vapor"

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Bradshaw, Robert W., Richard S. Larson, and Andrew E. Lutz. Vapor-liquid phase behavior of the iodine-sulfur water-splitting process : LDRD final report for FY03. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/919168.

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Lins, Raymond R., Lee E. Campbell, and Aaron M. Hyre. Domestic Preparedness Program: Sarin (GB) and Distilled Sulfur Mustard (HD) Vapor Challenge Testing of Commercial Self-Contained Breathing Apparatus. Defense Technical Information Center, 2003. http://dx.doi.org/10.21236/ada440427.

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Lins, Raymond R., and Lee E. Campbell. Domestic Preparedness Program: Phase 2 Sarin (GB) and Distilled Sulfur Mustard (HD) Vapor Challenge Testing of Commercial Self-Contained Breathing Apparatus Facepieces. Defense Technical Information Center, 2005. http://dx.doi.org/10.21236/ada435639.

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McMurry, P. H. Ultrafine aerosol size distributions and sulfuric acid vapor pressures: Implications for new particle formation in the atmosphere. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/5220187.

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McMurry, P. H. Ultrafine aerosol size distributions and sulfuric acid vapor pressures: Implications for new particle formation in the atmosphere. Year 1 progress report. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/10151005.

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McMurry, P. H. Ultrafine aerosol size distributions and sulfuric acid vapor pressures: Implications for new particle formation in the atmosphere. Year 2 progress report. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/10168795.

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