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Статті в журналах з теми "Sedimentation and depositions":
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Ahmadov, T. "THE ROLE OF COSMIC DUST IN THE FORMATION OF STRONG REFLECTIVE BOUNDARIES (ON THE EXAMPLE OF INDIVIDUAL AREAS OF AZERBAIJAN)." National Association of Scientists 2, no. 75 (February 1, 2022): 06–11. http://dx.doi.org/10.31618/nas.2413-5291.2022.2.75.558.
The paper underlines that reserves in anticline traps are exhausting both in Azerbaijan and around the globe and in this respect the priority today is exploration for hydrocarbon resources in non-anticline traps, which are formed with a certain role of non-depositions or in other words - breaks in sedimentation process. In this respect, it is natural that in the recent years the geoscientists pay a close attention to researches on non-anticline traps and non-depositions, since they were not covered by specific studies until now. It should be noted, that studies held at the “Geophysics” Department of Azerbaijan State Oil and Industry University are some kind of exception. In this paper, results of some studies are given, including outlined boundaries of unconformities, related to nondepositions under various seismogeological conditions in onshore and offshore areas. It has been also indicated, that no specific studies of non-depositions by use of seismic survey have been held in Azerbaijan. This paper is devoted to outlining and tracking of boundaries related to breaks in sedimentation process analyzed by use of various seismic survey data acquired in various oil and gas regions of Azerbaijan.
First of all, the paper considers the brief geological and geophysical characteristics of non-depositions and it is noted that a special role in their study is attributed to high-resolution seismic survey and electric survey. It is specially underlined that under the non-depositions the geoscientists mean the absence of terrestrial depositions and outlining and tracing of regional and reference seismic horizons are not complicated task. According to the latest studies, during the periods of global and local breaks in sedimentation process, the depositions of terrestrial origin are absent, however deposition of cosmic dust is continuously going on and this has been proved by various studies.
The paper also indicated the role of some researchers in studies of depositions of cosmic origin and their reflections in seismic data. The results of studies of depositions of cosmic origin by use of modeling held in Azerbaijan have been also displayed.
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Bai, Shu Zhan, Shuai Guo Lang, Ke Ping Yuan, Yang Liu, and Guo Xiang Li. "Experimental Study of Urea Depositions in Urea-SCR System." Advanced Materials Research 937 (May 2014): 74–79. http://dx.doi.org/10.4028/www.scientific.net/amr.937.74.
Avoiding the urea deposition in the exhaust stream is one of the basic requirements for SCR system normal application. Unreasonable structure design, machining and installation position all could lead to urea crystallization on the wall of exhaust pipe and the front end surface of the catalyst, in addition, unreasonable control strategy also could deteriorate this phenomenon. The components of the urea depositions are the urea and cyanuric acid analyzed by thermogravimetry - FTIR technology. The integrated injector mounting is designed to alleviate the urea crystallization based on analysis results. The engine test and the vehicle road test are all shown that the optimal structural design and calibration strategies could avoid crystallization and sedimentation effectively in the exhaust system.
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Middelkoop, H. "Heavy-metal pollution of the river Rhine and Meuse floodplains in the Netherlands." Netherlands Journal of Geosciences - Geologie en Mijnbouw 79, no. 4 (December 2000): 411–27. http://dx.doi.org/10.1017/s0016774600021910.
AbstractThe embanked floodplains of the lower Rhine river in the Netherlands contain large amounts of heavy metals, which is a result of many years of deposition of contaminated overbank sediments. The metal pollution varies greatly between the various floodplain sections as well as in vertical direction within the floodplain soil profiles. The present contribution describes the key processes producing the spatial variability of the metal pollution in floodplain soils: (1) spatial patterns of the concentrations and deposition of Cd, Cu, Pb and Zn during a single flood, which have been determined from samples collected after a high-magnitude flood event; (2) the pollution trends of the lower Rhine over the past 150 years, which were reconstructed on the basis of metal concentrations in sediments from small ponds within the floodplain area. During the flood the largest metal depositions (0.03 g/m2 Cd, 0.7 g/m2 Cu, 1.1 g/m2 Pb and 5.0 g/m2 Zn for the Rhine) occurred along the natural levees, decreasing to about one third of these values at larger distance from the river. Deposition of heavy metals occurred since the end of the nineteenth century. Periods of maximum pollution occurred in the 1930s and 1960s, when Cu, Pb and Zn concentrations were about 6–10 times as high as background values.The resulting metal distribution in the floodplain soil profiles is illustrated by means of typical examples. Maximum metal concentrations in floodplain soils vary from 30 to 130 mg/kg for Cu, from 70 to 490 mg/kg for Pb, and from 170 to 1450 mg/kg for Zn. The lowest metal pollution is found in the distal parts of floodplain sections with low flooding frequencies, where average sedimentation rates have been less than about 5 mm/a. The largest metal accumulations occur in low-lying floodplain sections where average sedimentation rates have been more than 10 mm/a.
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Abou Seedo, Kholoud, Mohammad S. Abido, Ahmed Salih, and Asma Abahussain. "Structure and Composition of Mangrove Associations in Tubli Bay of Bahrain as Affected by Municipal Wastewater Discharge and Anthropogenic Sedimentation." International Journal of Biodiversity 2017 (December 19, 2017): 1–9. http://dx.doi.org/10.1155/2017/2084256.
The effects of municipal wastewater discharge and anthropogenic sedimentation on the structure and composition of gray mangrove (Avicennia marina (Forsk.) Vierh.) communities along Tubli Bay coastlines in Bahrain were investigated. Growth and regeneration of mangrove were measured, and its community was characterized. Sediment profile was analyzed for texture, pH, and salinity. Mangrove area covered by sand depositions was measured using Google Earth Pro. ANOVA and regression tests were employed in the analysis of the data. Results indicated that mangrove overwhelmingly dominated plant community in the study area, which was zoned by a community of other salt-tolerant species. Three main habitats exist in the study area with high similarity in their floristic composition. Species richness and the number of habitats were low due to the aridity and high sediment salinity. The dilution effect of the secondary treated wastewater had a favorable effect on height and diameters of mangrove trees. However, no differences were observed in leaf area index, basal area, and density of mangrove. The long-term accumulation of anthropogenic sedimentation had a detrimental effect on the mangrove community, expressed in swath death of mangrove trees due to root burials and formation of high topography within the community boundaries.
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Cheremisska, O. M., and Yu V. Cheremissky. "Lithofacial and paleogeographic analysis of the Burdigallian-Langhian formations of the Ukrainian Carpathian Foredeep." Journal of Geology, Geography and Geoecology 28, no. 1 (April 16, 2019): 19–28. http://dx.doi.org/10.15421/111903.
This paper addresses issues related to the complexity of the geological structure of the Burdigallian-Langhian sediments of the Stebnyk suite, which wereformed in the Carpathian segment of Paratethys. The correlation of stratigraphic sections, based on a detailed description of the most complete sediments of the indigenous outcrops of the Stebnyk suite in the Sambir Unit of the Pre-Carpathian Foredeep, has been carried out. It was established that the sediments belong to a single tectono-sedimentation cyclic, the formation of which began with the deposition of red-coloured sediments and ended with the deposition of salt-bearing formations, which indicates the final closure of the Paratethys. A series of lithological columns was constructed taking into account the disjunctive and plicating faults, which allowed us to derive the true thickness of the Stebnyk suite deposits and determine its lithofacial structure. The results obtained became the basis for the construction of a lithological scheme for the distribution of lithofacies and a paleooceanographic sedimentation model of the research area. The aim of this work is to create a reconstruction of the environment of sedimentation in the Burdigallian-Langhian Age in the Sambir Unit of the Inner part of the Pre-Carpathian Foredeep. To obtain the results, the actual material obtained during the field observations was analyzed with the help of a complex of lithology-facial, geodynamical and petrographic methods. Due to the absence of the reliable paleontological data on deposits of the Miocene Stebnyk suite of the PreCarpathian basin, an attempt was made to partition the Stebnyk sedimentary sequence on lithological and formation features, basedon the author's research and with incorporation of new materials of paleooceanography of the Carpathian segment of the Paratethys. On the basis of paleooceanographic data, connected with formation of sedimentary strata of Stebnyk suite (Carpathian basin), the latter can be attributed to the red-coloured formation of foothill plains and deltas. Taking into account the data of the researchers and their own observations, one can come to the conclusion that the age of the sediments, mapped on existing geological maps as Vorotyshcha suite in considerable areas of Sambir Unit (near the villages of Krasne, Pidlyvche, Lysovychi) is questionable. This conception required the stratification of deposits formed on the stage of sedimentogenesis in the Miocene within the studied segment of the Central Paratethys. For the first time for depositions of this age, the scheme of the palaeoceanographic situation and a lithological-facial model of the sedimentation environment with the reduction of the true thickness of sediments was constructed. The Burdigallian-Langhian deposits were formed under conditions of lacustrine-alluvial plains of arid climate, symbolizing the final closure of the Central Paratethys. The presence of a detailed model for the formation of Burdigallian-Langhian deposits allows us to identify a number of criteria for the search for minerals.
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Gale, Luka. "Microfacies analysis of the Upper Triassic (Norian) "Bača Dolomite": early evolution of the western Slovenian Basin (eastern Southern Alps, western Slovenia)." Geologica Carpathica 61, no. 4 (August 1, 2010): 293–308. http://dx.doi.org/10.2478/v10096-010-0017-0.
Microfacies analysis of the Upper Triassic (Norian) "Bača Dolomite": early evolution of the western Slovenian Basin (eastern Southern Alps, western Slovenia)The Slovenian Basin represents a Mesozoic deep-water sedimentary environment, situated on the southern Tethyan passive margin. Little is known about its earliest history, from the initial opening in the Carnian (probably Ladinian) to a marked deepening at the beginning of the Jurassic. The bulk of the sediment deposited during this period is represented by the Norian-Rhaetian "Bača Dolomite", which has, until now, been poorly investigated due to a late-diagenetic dolomitization. The Mount Slatnik section (south-eastern Julian Alps, western Slovenia) is one of a few sections where the dolomitization was incomplete. Detailed analysis of this section allowed us to recognize eight microfacies (MF): MF 1 (calcilutite), MF 2 (pelagic bivalve-radiolarian floatstone/wackestone to rudstone/packstone), MF 3 (dolomitized mudstone) with sub-types MF 3-LamB and MF 3-LamD (laminated mudstone found in a breccia matrix and laminated mudstone found in thin-bedded dolomites, respectively) and MF 3-Mix (mixed mudstone), MF 4 (bioturbated radiolarian-spiculite wackestone), MF 5 (fine peloidal-bioclastic packstone), MF 6 (very fine peloidal packstone), MF 7 (bioclastic wackestone) and MF 8 (crystalline dolomite). The microfacies and facies associations indicate a carbonate slope apron depositional environment with hemipelagic sedimentation punctuated by depositions from turbidites and slumps. In addition to the sedimentary environment, two "retrogradation-progradation" cycles were recognized, each with a shift of the depositional setting from an inner apron to a basin plain environment.
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Situmorang, Dr B. "Seismic Stratigraphy Of The Makassar Basin." Scientific Contributions Oil and Gas 10, no. 1 (April 14, 2022): 3–38. http://dx.doi.org/10.29017/scog.10.1.895.
Seismic reflection profiles from the Makassar basin have been analysed in terms of seismic stratigraphy. Systematic patterns of reflection terminations indicate the existence of at least three surfaces of discontinuity across the profiles-designated in order of superposition as C1, C2 and C3 - which define the boundaries of four seismic sequences, ie. :- seismic sequence I : topped by C1- seismic sequence II : the interval between C1 and C2- seismic sequence III : the interval between C2 and C3- seismic sequence IV : the interval between Cz and the sea floor Seismic sequence II is dominated by basin slope and basin floor seismic facies whereas seismic sequences II and IV consist of mainly shelf and shelf margin seismic facies. Correlation of seismic sequences with well data facilitates the exposition of basin development, The Late Cretaceous-early Tertiary regional uplift and erosion produced a major unconformity C1, upon which the transgressive facies of seismic sequence II was deposited. A lowstand of sea level due to the so-called intra-Mio- cene orogeny occurred in the upper Early Miocene and produced the C2. Deposition of seismic sequence III is marked by a relative rise of sea level, probably followed by another lowstand of sea level during Mio-Pliocene which formed the C3. The final event is an overall transgression and deposition of seismic sequence IV, with a possible minor lowstand of sea level in Pliocene-Recent, The occurrence of basin slope and basin floor seismic facies within seismic sequence II suggests that in the pre-Lower Miocene, basin subsidence was slightly greater than the rate of depositions. Since Lower Miocene both subsidence and sedimentation rates were equal and the deposition of shelf and shelf margin seismic facies of seismic sequences III and IV was prevailed in the basin.
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Nwaoha, Adanma Florence, Camelita Chima Ohaeri, and Ebube Charles Amaechi. "Prevalence of diarrhoea, and associated risk factors, in children aged 0-5 years, at two hospitals in Umuahia, Abia, Nigeria." UNED Research Journal 9, no. 1 (March 14, 2017): 7–14. http://dx.doi.org/10.22458/urj.v9i1.1672.
Diarrhoea is the second leading cause of infectious morbidity and mortality in children under five years of age. This study aimed at identifying the most common parasites and potential risk factors for diarrhoea among children 0-5 years attending Abia State Specialist hospital and Federal Medical Centre, Umuahia, in south eastern Nigeria. We used 400 faecal samples from children with diarrhoea –and 200 without– in combination with hospital-based case control and a questionnaire Stool samples were processed with direct normal saline and formal-ether sedimentation method for parasitological studies. More males than females were infected in nearly all age groups in both diarrhoeal and control groups (X2=23.04, df=1, P<0.05: X2=11.52, df=1, P<0.05 respectively). Amachara had more infections (X2=0.15, df=1, P< 0.05). January had the highest rate of infection (22.5%). Main clinical features were watery depositions over 3 times a day, diarrhoea lasting for days, fever, vomiting, and dehydration. Mothers learned about the problem through health workers, television and in medical centers. Risk correlated with mother’s education, occupation, latrine type, waste water disposal, hand washing, kitchen cleaning; sources and storage of water; and bottle milk (P< 0.05).Ignorance greatly contributed to the spread of parasitic disease in the area: the government should improve education and other strategies to alleviate the spread of the disease..
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Bhuju, DR, S. Sharma, PK Jha, and NP Gaire. "Scientific Discourse of Lakes in Nepal." Nepal Journal of Science and Technology 13, no. 2 (March 8, 2013): 147–58. http://dx.doi.org/10.3126/njst.v13i2.7728.
Over 5,000 standing water bodies, including those <1 ha and spread in 74 districts of Nepal have been scanned on the topographic sheets (scale of 1:125,000). Majority of these lakes or ponds are either in the high altitudes (above 3,000 m) or in lowland Tarai (below 500 m). In a literature review we found over 163 research studies conducted since the first study of lakes in 1969 in Khumbu region, majority being at the initiative of national academia, their faculties and graduate students. However, a complete inventory of Nepal’s lakes is still lacking. Their characteristics and distinction from wetlands are also to be defined as the existing laws and rules do not protect lakes or ponds categorically, rather they are blanketed under wetlands and/or other river like water resources. Research observations have shown that acid depositions are the most likely source of pollution affecting high altitude lakes in the Himalayan regions during spring. Their value as religious sites has also caused anthropogenic alteration in nutrient concentrations and biological assemblages of the lake. Encroachment to the lakes/ponds is rampant to which the natural processes of sedimentation, alien species invasion or any kind of obliteration become supportive. Capacity building, knowledge generation and threat management are vital to protect these natural heritages from untimely demise. Nepal Journal of Science and Technology Vol. 13, No. 2 (2012) 147-158 DOI: http://dx.doi.org/10.3126/njst.v13i2.7728
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Wang, L. C., H. Behling, T. Q. Lee, H. C. Li, C. A. Huh, L. J. Shiau, and Y. P. Chang. "Late Holocene environmental reconstructions and the implications on flood events, typhoon patterns, and agriculture activities in NE Taiwan." Climate of the Past Discussions 10, no. 3 (May 5, 2014): 1977–2009. http://dx.doi.org/10.5194/cpd-10-1977-2014.
Abstract. In this study, we reconstructed the paleoenvironmental changes from a sediment archive of the floodplain lake in Ilan Plain of NE Taiwan on multi-decadal resolution for the last ca. 1900 years. On the basis of pollen and diatom records, we evaluated the record of past vegetation, floods, typhoons and agriculture activities of this area, which is sensitive to the hydrological conditions of the West Pacific. High sedimentation rates with low microfossil preservations reflected multiple flood events and humid climatic conditions during 100–1400 AD. A shortly interrupted dry phase can be found during 940–1010 AD. The driest phase corresponds to the Little Ice Age phase 1 (LIA1, 1400–1620 AD) with less disturbance by flood events, which enhanced the occurrence of wetlands (Cyperaceae) and diatom depositions. Humid phases with frequent typhoons are inferred by high percentages of Lagerstroemia and high ratios of planktonic/benthic diatoms, respectively, during 500–700 AD and Little Ice Age phase 2 (LIA2, 1630–1850 AD). The occurrences of cultivated Poaceae (Oryza) during 1250–1300 AD and the last ~400 years, reflect agriculture activities, which seems to implicate strongly with the environmental stability. Finally, we found flood events which dominated during the El Niño-like stage, but dry events as well as frequent typhoon events happened during the La Niña-like stage. After comparing our results with the reconstructed proxy for tropical hydrological conditions, we suggested that the local hydrology in coastal East Asia were strongly affected by the typhoon-triggered heavy rainfalls which were influenced by the variation of global temperature, expansion of the Pacific warm pool and intensification of ENSO events.
Дисертації з теми "Sedimentation and depositions":
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Dittmers, Klaus Hauke. "Late Weichselian to Holocene sedimentation in the inner Kara Sea : qualification and quantification of processes = Sedimentationsprozesse in der inneren Kara-See (Spät-Weichsel bis Holozän) /." Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung, 2006. http://www.gbv.de/dms/goettingen/510037178.pdf.
van, der Vegt Paul. "Glacial systems sedimentation and tunnel valleys." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610766.
Casarim, Felipe M. Lockaby Bruce Graeme. "Legacy sediments in southeastern United States coastal plain streams." Auburn, Ala., 2009. http://hdl.handle.net/10415/1976.
Roop, Heidi Anne. "Sedimentation in a proglacial lake : interpreting intra- and inter-annual sedimentation in Linnévatnet, Spitsbergen, Norway /." Connect to online version, 2007. http://ada.mtholyoke.edu/setr/websrc/pdfs/www/2007/235.pdf.
Undergraduate honors paper--Mount Holyoke College, 2007. Dept. of Earth and Environment. Includes one CD-Rom appendix of 2005-2006 grain size data. Includes bibliographical references (leaves 125-129).
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Taylor, Kelly Lynne. "Beach sediments : a source of dissolved organic carbon and nitrogen species to the coastal ocean /." Electronic version (PDF), 2005. http://dl.uncw.edu/etd/2005/taylork/kellytaylor.pdf.
Babault, Julien. "Dynamique de l'érosion dans une chaîne de montagnes : influence de la sédimentation de piedmont, l'exemple des Pyrénées /." Rennes, France : Université de Rennes I, Campus de Beaulieu, 2004. http://www.geosciences.univ-rennes1.fr/biblio/edition/MGR-Babault.htm.
Elsner, Paul Heinrich. "Monitoring intertidal sedimentation dynamics using airborne imaging spectroscopy." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609749.
This dissertation presents the detailed results of investigations into the coastal geomorphological effects and sedimentation processes associated with a recent large tsunami event which took place on the 12th December 1992 in Flores, Indonesia, and the stratigraphical and sedimentological study of a widespread sand layer preserved in coastal sedimentary sequences along the eastern coast of Scotland representing a low-frequency, high-energy marine event, which took place at circa 7,000 radiocarbon years B.P. With modern alalogues, established in this dissertation, of both tsunami and storm surge sedimentary characteristics and sedimentation processes as the key, together with high-resolution sedimentological evidence obtained from the circa 7,000 radiocarbon years B. P. event, competing hypotheses of the likely causes of the marine flooding by either a tsunami or storm surge event are tested. It is concluded that the circa 7,000 B. P. marine flooding event was a tsunami, believed to have been generated by one of the world's largest submarine landslides in the Norwegian Sea - the Second Storegga Slide. The particle size composition of tsunami sediments is found to vary from well sorted to poorly sorted and is controlled by both the characteristics of the source sedement (local coastal sediments) and sedimentation processes associated with tsunami inundation. Tsunami sediments deposited on land are believed to form continuous and discontinuous sedimentary sheets ascending up to levels distinctively higher than contemporary sea levels and to contain a general landward-fining trend and multiple sets of grading (fining-upward) sequences, reflecting spatial changes in particle size composition. A conceptual model of coastal tsunami sedimentation is established including processes of seaward and landward sediment movements, episodic rapid deposition, sediment accumulation and erosion.
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Kattah, Senira da Silva. "Controls on deposition and resulting stratal architecture of coarse-grained alluvial and near-shore facies associations /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
Lorrey, Andrew M. "Distribution of Patterned Ground and Surficial Deposits on a Debris-covered Glacier Surface in Mullins Valley and Upper Beacon Valley, Antarctica." Fogler Library, University of Maine, 2002. http://www.library.umaine.edu/theses/pdf/LorreyAM2002.pdf.
Nolan, K. Michael. Suspended-sediment budgets for four drainage basins tributary to Lake Tahoe, California and Nevada, 1984-87. Sacramento, Calif: U.S. Dept. of the Interior, U.S. Geological Survey, 1991.
Nolan, K. Michael. Suspended-sediment budgets for four drainage basins tributary to Lake Tahoe, California and Nevada, 1984-87. Sacramento, Calif: U.S. Dept. of the Interior, U.S. Geological Survey, 1991.
Nolan, K. Michael. Suspended-sediment budgets for four drainage basins tributary to Lake Tahoe, California and Nevada, 1984-87. Sacramento, Calif: U.S. Dept. of the Interior, U.S. Geological Survey, 1991.
Nolan, K. Michael. Suspended-sediment budgets for four drainage basins tributary to Lake Tahoe, California and Nevada, 1984-87. Sacramento, Calif: U.S. Dept. of the Interior, U.S. Geological Survey, 1991.
Nolan, K. Michael. Suspended-sediment budgets for four drainage basins tributary to Lake Tahoe, California and Nevada, 1984-87. Sacramento, Calif: U.S. Dept. of the Interior, U.S. Geological Survey, 1991.
Частини книг з теми "Sedimentation and depositions":
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Lisitzin, Alexander P. "Silica Deposition." In Oceanic Sedimentation, 285–320. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1002/9781118665008.ch9.
Yates, John T. "Sedimentation Method for Depositing Phosphor Screens." In Experimental Innovations in Surface Science, 194–97. New York, NY: Springer New York, 1997. http://dx.doi.org/10.1007/978-1-4612-2304-7_61.
Bonnas, Sylvia, Jan Tabellion, and Jürgen Hausselt. "Effect of Particle Size Distribution and Sedimentation Behaviour on Electrophoretic Deposition of Ceramic Suspensions." In Electrophoretic Deposition: Fundamentals and Applications II, 69–74. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-998-9.69.
Eisma, D. "Supply and Deposition of Suspended Matter in the North Sea." In Holocene Marine Sedimentation in the North Sea Basin, 415–28. Oxford, UK: Blackwell Publishing Ltd., 2009. http://dx.doi.org/10.1002/9781444303759.ch29.
Einsele, Gerhard. "Sedimentation Rates and Organic Matter in Various Depositional Environments." In Sedimentary Basins, 455–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04029-4_10.
Einsele, Gerhard. "Sedimentation Rates and Organic Matter in Various Depositional Environments." In Sedimentary Basins, 385–408. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-77055-5_10.
Bonilla, L. L., and Y. Farjoun. "Minisymposium Precipitation, Deposition and Sedimentation of Particles in Fluid Flow." In Progress in Industrial Mathematics at ECMI 2008, 453–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12110-4_70.
Demchenko, R. I., M. J. Zheleznyak, and L. A. Koziy. "Modelling of Sedimentation and Radionuclides Deposition in a Bottom Trap." In Computational Methods in Water Resources X, 1341–48. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9204-3_162.
RYSETH, ALF. "Sedimentation at the Jurassic-Triassic boundary, south-west Barents Sea." In From Depositional Systems to Sedimentary Successions on the Norwegian Continental Margin, 187–214. Chichester, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118920435.ch9.
Riegl, Bernhard, Anthony Poiriez, Xavier Janson, and Kelly L. Bergman. "The Gulf: Facies Belts, Physical, Chemical, and Biological Parameters of Sedimentation on a Carbonate Ramp." In Carbonate Depositional Systems: Assessing Dimensions and Controlling Parameters, 145–213. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9364-6_4.
Тези доповідей конференцій з теми "Sedimentation and depositions":
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Hayati, Hamideh, and Yu Feng. "A Precise Scale-Up Method to Predict Particle Delivered Dose in a Human Respiratory System Using Rat Deposition Data: An In Silico Study." In 2020 Design of Medical Devices Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/dmd2020-9060.
Abstract As surrogates to human beings, rats are used occasionally to study the therapeutic impact of inhaled pulmonary drug particles in microscale. To speculate human responses from rat studies, scale-up factors are widely used to extrapolate particle lung deposition from rat to human. However, available scale-up methods are highly simplified and not accurate, because they directly use the human-to-rat ratios of body weights (RBW) or lung surface areas (RSA) as the scale-up factor. To find a precise scale-up strategy, an experimentally validated Computational Fluid-Particle Dynamics (CFPD) was employed to simulate the transport and deposition of microparticles in both human and rate respiratory systems, which encompasses the pulmonary routes from mouth/nose to airways up to Generation 17 (G17) for human and G23 for the rat. Microparticles with the same range of Stk/Fr were injected into both models with the airflow at resting conditions. Numerical results indicate that particles (with the size ranging from 1 to 13 μm for humans and 0.6 to 6 μm for rat) have similar deposition pattern (DP) and deposition fraction (DF) in both models, which are resulted from both inertial impaction and gravitational sedimentation effects. A novel correlation is proposed to predict DFs in both human and rat respiratory systems as a function of the ratio of Stokes number to Froude number (Stk/Fr). Using the correlation as the novel scale-up tool, inter-species extrapolations can be precisely done on predicting particle depositions in human respiratory systems based on the deposition data in rats obtained from animal studies.
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Somani, Imshaan, Jonathan Whitten, Sinjae Hyun, and Chong S. Kim. "Effects of Sedimentation on Particle Deposition in the Lung Alveoli." In ASME 2008 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2008. http://dx.doi.org/10.1115/sbc2008-192934.
Deposition of inhaled particles in the lung is one of the key factors for assessing toxic effects of airborne pollutant particles on one hand and for evaluating efficacy of inhalant pharmaceutical aerosols on the other side. Due to the geometric complexity and time-dependency of respiratory tracks, the correct prediction of the particle transport and deposition in the lung airway has been studied with experimental and computational approaches. The human alveolar duct, which connects the alveoli to the bronchioles of the lung, is recently the subject of interest within mathematical modeling because of its implications to drug delivery and ingestion of pollutants. Series of computational approaches have been performed to model the entire lung using 1-dimensional and “trumpet” model analyses [1,2]. Although these models represent with reasonable approximation of the regional particle deposition characteristics, they do not account for the local intricacy of particle transport and deposition in the acinus region, consisting of the alveolar duct and alveoli.
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Zhang, N., Z. Charlie Zheng, L. Glasgow, and B. Braley. "Particle Deposition in a Room-Scale Chamber With Particle Injection." In ASME 2005 Fluids Engineering Division Summer Meeting. ASMEDC, 2005. http://dx.doi.org/10.1115/fedsm2005-77090.
A model simulating the deposition of small particles with turbulent transport, sedimentation, and coagulation, is presented. Experimental measurements were conducted in a room-scale chamber using a specially designed sequential sampler. The measured deposition-rate data are compared with the simulation results. Distributions of particle-number density at different times are plotted in several viewing planes to facilitate discussion of the particle distribution patterns.
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Jin, Ming, and DingHua Hu. "Effect of Particle Sedimentation on Sessile Nanofluid Droplet." In ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/mnhmt2019-4053.
Abstract The effect of particle sedimentation on the evaporation rate of nanofluid droplets on a heated substrate is studied numerically. A two-dimension model of droplet evaporation and deposition using Arbitrary Lagrangian-Eulerian (ALE) method is developed, considering evaporation cooling, two-phase heat transfer, mass diffusion, nanoparticle transport and free surface evolution. The effects of temperature and particle concentration distribution on the total and local evaporation rate of millimeter-sized sessile nanofluid droplets with varying substrate temperature are numerically analyzed. It is shown that the nanoparticle concentration nearby the droplet edge is much higher than that nearby droplet center, and also the sedimentation at droplet edge is much more than that at droplet center. The non-uniform nanoparticle concentration inside droplets leads to a greater temperature difference along the free surface.
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Chen, Jun Yan, Pu Zhen Gao, Hai Feng Gu, and Hui Yu Yu. "Effects of Aggregation on Gravity Settlement of Submicron Aerosols Under High Temperature and High Humidity Conditions." In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-92065.
Abstract Coupling aerosol gravity sedimentation mechanism and aggregation effect, considering the correction of submicron particle free path and gas dynamic viscosity in thermal environment, a gravitational sedimentation model suitable for submicron aerosol accompanied by coalescence effect under high temperature and high humidity conditions is established, and the established model is verified by the results of thermal experiments. The aerosol aggregation model is established using the discretization method. By controlling whether the aggregation mechanism occurs in the established model, the influence of aggregation on gravitational settling when steam fraction and ambient pressure are changed is studied. In the study, it was found that the aggregation effect has a nearly 1-fold acceleration effect on the decay constant of the number concentration of submicron aerosols during gravitational sedimentation, and the acceleration effect on the decay constant of the mass concentration can be ignored, but there is an acceleration trend. When submicron aerosols settle under high temperature and high humidity conditions, the number median particle size tends to increase, that is, the increase of the number median particle size by the aggregation effect is greater than the decrease of the number median particle size by gravity sedimentation. After considering the aggregation effect, the number concentration decay constant and the mass concentration decay constant when the submicron aerosol undergoes gravitational sedimentation will decrease with the increase of the ambient pressure, and increase with the increase of the steam fraction. However, the number concentration decay constant changes larger, the mass concentration decay constant has a trend of change, and the change range is relatively weak. In addition, in the sensitivity analysis of the aerosol coalescence and gravitational sedimentation models, it is found that the molecular free path has a greater impact on the calculation results of aerosol coalescence and deposition in a thermal environment than the dynamic viscosity. Moreover, the influence of Brownian coalescence on the aerosol particle size spectrum is much greater than that caused by gravitational coalescence.
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Melhem, Omar A. "CFD Simulations of Aerosol Particles Deposition in a Venturi Meter Used in Smoke Sampling Devices." In ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fedsm2016-7657.
Smoke sampling devices are used in several fields to study dynamics of smoke aerosols. An important criterion in designing smoke sampling devices is that flow paths leading to where the sample is characterized are constructed such that deposition of aerosol particles along the paths is minimized. Sampling devices often include a Venturi flow meter installed downstream of the smoke source, which may significantly alter the composition of the aerosol reaching the sample analyzer. The current work employs Computational Fluid Dynamics (CFD) to model particle deposition within the flow meter and to examine the effects of different design parameters. This study focuses on particles with sizes ranging from 0.01 to 100 microns, for which three main mechanisms for deposition can be identified: inertial impaction, gravitational sedimentation, and Brownian diffusion. It has been shown that inertial deposition is negligible for ultrafine particles (5–560 nm) and it becomes noticeable for particles in the micron size range. Also, deposition fractions increase with increasing particle sizes. Moreover, inertial particle deposition increases with increasing volume flow rates.
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Woodmansee, D. E., A. K. Tolpadi, T. H. Hwang, and A. D. Maddaus. "Ensuring Adequate Coolant Purity for Advanced Gas Turbines." In ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-281.
The role of particulate contaminants in advanced gas turbine coolants is discussed, especially in light of the extremely high G-field regions they will experience in service. Predictions of sedimentation in both laminar and highly turbulent accelerating flows using a computational fluid dynamics code are made for a range of particulate sizes to show that particles over 0.5 µm are of concern. Possible techniques for limiting access of these particulates to the gas turbines themselves are presented. Overall, contaminant deposition appears controllable, limiting required cleaning of coolant channels to regularly scheduled inspections.
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Renger, Stefan, Sören Alt, Wolfgang Kästner, André Seeliger, and Frank Zacharias. "Insulation Material Deposition and Distribution in a PWR Fuel Assembly Cluster." In 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icone20-power2012-54410.
Background of experimental and methodical work is the loss of coolant accident (LOCA) with release of fibrous pipe insulation material. Latest investigations were focused on material deposition and distribution (cross mixing) in the reactor core. Therefore, a 2×2 PWR fuel assembly (FA) cluster was constructed. Four shortened PWR-FA-dummies are provided with separated in- and outlets. Every 16×16 fuel rod dummy consists of 20 control rod simulators, two spacers, FA-head and FA-bottom with a 3.5×3.5 mm integrated debris-screen filter (IDF). The cluster is encased in an acrylic housing for visual observation. It is connected with the test facility “Zittau Flow Tray” (ZFT), a simplified sump model, which allows inclusion and investigation of complex phenomena like material sedimentation in the sump and strainer blockages. A well mixing of air in the fluid was also considered by free jet expansions and flows through full cone-nozzles as well as marginal air entrainments. This Paper includes descriptions of applied measuring techniques (digital image processing, thrubeam laser sensors etc.) and an overview of all considered boundary conditions. Experimental results, aiming at the development, implementation and verification of multiphase flow and strainer models, are presented.
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Kyoichi, Okamoto, Toyama Takeshi, and Komoriya Tomoe. "Development on Most Suitable Removal Method of Radioactive Cesium Adsorbed on Ocean Sludge by Using Fine Bubble and Activating Microorganisms." In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-62581.
Fukushima nuclear accident of March 11, 2011, soil and water had been contaminated by radioactive cesium. Moreover, radioactive cesium was found in the ocean sludge in Tokyo Bay flowing from rivers. Cesium which is adsorbed to the sludge cannot be easily removed. One of the authors developed decomposition and purification system, a circulation-type system by fine bubbles, that is, by creating aerobic state, aerobic bacteria are activated resulting to decomposition and purification of ocean sludge. Based on the hypothesis that radioactive cesium is adsorbed on the surface of the sludge deposition. It is considered that cesium can be eluted after decomposing the deposited sludge. Once the cesium is eluted in the water, it can fix to a mineral such as zeolite. Eluting and fixing cesium adsorbed on sludge takes so much time. In this case, the concept of removing the left sludge by flocculation method and then followed by coagulating sedimentation method is studied. In this study, our objects are to show the effectivity and efficiency of using flocculation and coagulating sedimentation in removing radioactive cesium. As the results, we pointed out this method is very good.
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Li, Li, Fujian Ma, Chao Xu, Lianlian Liu, Yaosen Wang, Rui Zeng, Zijing Gong, et al. "Integrated Seismic Processing and Geological Identification of the Late Eocene Reservoir Body in Lufeng Block, Pear River Mouth Basin." In International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-21903-ea.
Abstract The main exploration challenges of the Lufeng Sag, Pear River Mouth Basin (PRMB) area are complex fluvial-deltaic depositional stacking and associated oil-water distributions. The reservoir bodies are buried at approximately 2700 to 3000 m under mud lines, and at these depths the quality of the seismic data is too poor to accurately characterize the reservoirs. The poor seismic quality also results from complex fluvial sedimentation that is overlain by a high-speed limestone layer, as well as deeply buried, thin intervals of interest. In this paper we propose an integrated approach to reprocess the data, increase the imaging quality, and improve the geological understanding of the area. The geology-guided seismic data processing and integrated interpretations, along with seismic inversions, are proved to be a practical solution to improve geologic understanding and help to conduct a drilling campaign for infill wells. The new processed data show improved image quality, including the signal-to-noise ratio and the resolution via noise attenuations, demultiples, and broadband extension processing. Two sedimentation sources are identified with the new data, while the legacy data were vague, and the reservoir layers were interpreted as a single-sourced fluvial-deltaic depositional system. These misleading interpretations do not help us understand the complex oil-water relationship discovered by drilling and failed to locate the sweet spots for future infill wells. However, the new processed data shed light on all the issues and have become a game changer for the area.
Звіти організацій з теми "Sedimentation and depositions":
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Donohue, Patrick, Ronald Copeland, and James Lewis. Technical assessment of the Old, Mississippi, Atchafalaya, and Red (OMAR) Rivers : Atchafalaya River HEC-6T model. Engineer Research and Development Center (U.S.), August 2022. http://dx.doi.org/10.21079/11681/45161.
The HEC-6T one-dimensional numerical sedimentation model was used to evaluate the long-term and system-wide sedimentation effects of modifying the operation schedule at the Old River Control Complex (ORCC). The changes evaluated were increasing and decreasing the percentage of flow that is diverted to the Atchafalaya River from the Mississippi River at the ORCC and modifying the distributions through the four ORCC structures. Sedimentation effects for several operation scenarios were compared to a Base Condition that represented the existing operation protocols. Additionally, a dredging scenario was developed and analyzed. This scenario featured dredging material from the Mississippi River and depositing it into the Outflow Channel, downstream of the ORCC. The predictive simulations extended for 50 years. The model was used to calculate and compare sand transport past various gages along the Atchafalaya River. Also, the model compared differences in water surface elevations and bed elevations using a specific gage analysis at several gages along the Atchafalaya River. Last, the effects of the various scenarios on annual dredging requirements in Berwick Bay were also determined.
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Mueller, C., S. J. Piercey, M. G. Babechuk, and D. Copeland. Stratigraphy and lithogeochemistry of the Goldenville horizon and associated rocks, Baie Verte Peninsula, Newfoundland. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328990.
The Goldenville horizon in the Baie Verte Peninsula is an important stratigraphic horizon that hosts primary (Cambrian to Ordovician) exhalative magnetite and pyrite and was a chemical trap for younger (Silurian to Devonian) orogenic gold mineralization. The horizon is overlain by basaltic flows and volcaniclastic rocks, is intercalated with variably coloured argillites and cherts, and underlain by mafic volcaniclastic rocks; the entire stratigraphy is cut by younger fine-grained mafic dykes and coarser gabbro. Lithogeochemical signatures of the Goldenville horizon allow it to be divided into high-Fe iron formation (HIF; &gt;50% Fe2O3), low-Fe iron formation (LIF; 15-50% Fe2O3), and argillite with iron minerals (AIF; &lt;15% Fe2O3). These variably Fe-rich rocks have Fe-Ti-Mn-Al systematics consistent with element derivation from varying mineral contributions from hydrothermal venting and ambient detrital sedimentation. Post-Archean Australian Shale (PAAS)-normalized rare earth element (REE) signatures for the HIF samples have negative Ce anomalies and patterns similar to modern hydrothermal sediment deposited under oxygenated ocean conditions. The PAAS-normalized REE signatures of LIF samples have positive Ce anomalies, similar to hydrothermal sediment deposited under anoxic to sub-oxic conditions. The paradoxical Ce behaviour is potentially explained by the Mn geochemistry of the LIF samples. The LIF have elevated MnO contents (2.0-7.5 weight %), suggesting that Mn from hydrothermal fluids was oxidized in an oxygenated water column during hydrothermal venting, Mn-oxides then scavenged Ce from seawater, and these Mn-oxides were subsequently deposited in the hydrothermal sediment. The Mn-rich LIF samples with positive Ce anomalies are intercalated with HIF with negative Ce anomalies, both regionally and on a metre scale within drill holes. Thus, the LIF positive Ce anomaly signature may record extended and particle-specific scavenging rather than sub-oxic/redox-stratified marine conditions. Collectively, results suggest that the Cambro-Ordovician Taconic seaway along the Laurentian margin may have been completely or near-completely oxygenated at the time of Goldenville horizon deposition.
