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Letteratura scientifica selezionata sul tema "Nitrogen cycle"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 29 luglio 2024

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Articoli di riviste sul tema "Nitrogen cycle"

1

Ferguson, Stuart J. "Nitrogen cycle enzymology". Current Opinion in Chemical Biology 2, n. 2 (aprile 1998): 182–93. http://dx.doi.org/10.1016/s1367-5931(98)80059-8.

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2

Rosca, Victor, Matteo Duca, Matheus T. de Groot e Marc T. M. Koper. "Nitrogen Cycle Electrocatalysis". Chemical Reviews 109, n. 6 (10 giugno 2009): 2209–44. http://dx.doi.org/10.1021/cr8003696.

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3

Stein, Lisa Y., e Martin G. Klotz. "The nitrogen cycle". Current Biology 26, n. 3 (febbraio 2016): R94—R98. http://dx.doi.org/10.1016/j.cub.2015.12.021.

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4

Fisher, Thomas R. "The Marine Nitrogen Cycle". Ecology 66, n. 1 (febbraio 1985): 316–17. http://dx.doi.org/10.2307/1941341.

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5

Crossman, Lisa, e Nicholas Thomson. "Peddling the nitrogen cycle". Nature Reviews Microbiology 4, n. 7 (luglio 2006): 494–95. http://dx.doi.org/10.1038/nrmicro1456.

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6

Doane, Timothy A. "The Abiotic Nitrogen Cycle". ACS Earth and Space Chemistry 1, n. 7 (16 agosto 2017): 411–21. http://dx.doi.org/10.1021/acsearthspacechem.7b00059.

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7

Capone, Douglas G. "The Marine Nitrogen Cycle". Microbe Magazine 3, n. 4 (1 aprile 2008): 186–92. http://dx.doi.org/10.1128/microbe.3.186.1.

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8

Jetten, Mike S. M. "The microbial nitrogen cycle". Environmental Microbiology 10, n. 11 (novembre 2008): 2903–9. http://dx.doi.org/10.1111/j.1462-2920.2008.01786.x.

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9

Cavigelli, Michel A. "Agriculture and the Nitrogen Cycle". Ecology 86, n. 9 (settembre 2005): 2548–50. http://dx.doi.org/10.1890/0012-9658(2005)86[2548:aatnc]2.0.co;2.

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10

Capone, Douglas G., e Angela N. Knapp. "A marine nitrogen cycle fix?" Nature 445, n. 7124 (gennaio 2007): 159–60. http://dx.doi.org/10.1038/445159a.

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Tesi sul tema "Nitrogen cycle"

1

Burgoyne, Calum K. "Parameterisation of a nitrogen cycle model". Thesis, University of Aberdeen, 2012. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=191768.

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Cioncoloni, Giacomo. "Towards an anthropogenic nitrogen cycle based on nitrite". Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/30717/.

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The overall goal of this thesis was to investigate the feasibility of a new route to anthropogenic nitrogen fixation based on the oxidation of nitrogen (to give primarily nitrite), and then electrocatalytic conversion of nitrite to other N-containing species of interest, such as nitrate and nitric oxide (NO). In pursuit of this goal, the synthesis of metal-ligand coordination complexes that could act as electrocatalysts for the oxidation of nitrite to nitrate was attempted, as was the synthesis of metal-ligand coordination complexes that could act as electrocatalysts for the reduction of nitrite to NO. As a corollary to this, routes for the initial fixation reaction were also investigated, of which the ultrasonic generation of nitrite from aerated aqueous solutions was found to be the most promising. The work detailed in this thesis is organized in the following manner: In Chapter 1 we discuss coordination complexes that mimic the enzymes promoting the redox reactions of the nitrogen cycle involving nitrite as a substrate or product. During this introduction we will also give an overview of topics that are relevant to the following chapters, such as proton-coupled-electron transfer and basic kinetic treatment of catalytic reactions. Chapter 2 is a description of the different techniques used throughout this thesis. Once having set the bases, we shall start with the actual research, which corresponds to Chapters 3 to 6. Chapter 3 deals with the synthesis, characterization and catalytic properties of a copper coordination compound mimicking the active site of the copper nitrite reductase (CuNiR) class of enzymes. This chapter includes a detailed study of the kinetics and electrocatalytic properties of this complex towards the mono-electronic reduction of nitrite to nitric oxide. Chapters 4 and 5 deal with the unusual structures and spectroscopic properties of a number of new cobalt complexes that we isolated whilst trying to develop Mo(bis-dithiolene) coordination complexes that might act as analogues of the molybdenum nitrite oxidoreductase (MoNiOR), which oxidises nitrite to nitrate in nature. Our original Mo-containing targets proved impossible to obtain and are not discussed in this thesis. However, we found that cobalt readily makes coordination complexes with these bis-dithiolene ligands, which allowed us to isolate the compounds we present in Chapters 4 and 5. Hence in Chapter 4 we show the synthesis and the solvatochromic properties of mixed-ligand mono-nuclear Co-diimine o-catecholato complexes and compare these complexes with the analogous compounds prepared with o-benzenedithiolato ligands. Chapter 5 then discusses the synthesis and redox properties of a mixed-ligand di-cobalt coordination complex in which the two cobalt centres have (unprecedented) inequivalent metal coordination environments. Finally, in Chapter 6 we describe a much-underexplored way to fix nitrogen based on a sonochemical reaction. After a brief introduction we describe the optimisation of the procedure and comparisons with previous reports.

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Rahn, Thomas A. "Enrichment of ¹⁵N and ¹⁸O in stratospheric nitrous oxide : observations, experimental results, and implications /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1998. http://wwwlib.umi.com/cr/ucsd/fullcit?p9907828.

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4

Parolari, Anthony Joseph. "The nitrogen cycle and ecohydrology of seasonally dry grasslands". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/79491.

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Thesis (Ph. D. in the Field of Hydrology)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, February 2013.
"February 2012." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 155-172).
This thesis addresses the coupling of hydrologic and biogeochemical processes and, specifically, the organization of ecosystem traits with the water, carbon, and nitrogen cycles. Observations from a factorial irrigation-fertilization experiment in a seasonally dry annual grassland are combined with a simple ecosystem model to identify relationships between vegetation, nitrogen availability, and hydrology. Assuming primary productivity is water-limited, data analysis indicates that soil moisture and canopy conductance are insensitive to nitrogen supply, owing to a trade-off between canopy density and leaf conductance that maximizes efficient use of available water. That is, fertilization-induced increases in leaf area index are offset by reduced leaf area-based stomatal conductance. When primary productivity is assumed to be co-limited by water and nitrogen availability, total surface conductance is estimated to be insensitive to nitrogen supply, but added nitrogen increases the ratio of transpiration to evaporation. This coupled water-carbon-nitrogen model is then extended to predict ecosystem sensitivity across independently varied gradients of water and nitrogen supply rates. This analysis reveals two distinct regimes of plant-resource organization. In arid climates, rooting depths decrease with increasing aridity, while in humid climates, rooting depths increase with aridity. In all climates, rooting depths increase with increased nitrogen supply. Further, relative root-carbon allocation always increases with aridity and decreases with nitrogen supply. These resource use strategies result in an efficient use of available water in arid climates and efficient use of available nitrogen in humid climates. The associated ecosystem process rates indicate that nitrogen supply is an important determinant of surface water and carbon fluxes in humid climates, but only of carbon fluxes in arid climates.
by Anthony Joseph Parolari.
Ph.D.in the Field of Hydrology

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5

Monteiro, Maria Rovisco Correia Gonçalves. "Dynamic of estuarine prokaryotic communities and the nitrogen cycle". Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/12738.

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Mestrado em Microbiologia
Estuaries are highly dynamic aquatic systems, having steep physical and chemical gradients, such as salinity, influencing microbial communities in terms of their abundance and diversity. The analysis of microbial responses and adaptations to those environmental fluctuations became essential to understand the biogeochemical cycles that regulate these ecosystems, which have been undergoing progressive anthropogenic pressures. In this study, we investigated the dynamics of Archaea and Bacteria diversity along the salinity gradient of the Douro River estuary (NW Portugal). Samples were collected at four locations covering the salinity gradient, ranging from 4.9 - 21.7 ppt. The application of denaturing gradient gel electrophoresis (DGGE) showed a variation of Bacteria and Archaea diversity along the salinity gradient. The diversity of ammonia oxidizing Archaea (AOA) was also assessed by the analysis of amoA diversity. Simultaneously, were measured net fluxes of inorganic nitrogen (NH4+, NO3-, NO2-) and nitrification rates by using acetylene and 15N isotope analysis. The results showed that although there was an increase in the diversity of AOA with the decrease of salinity, the highest magnitudes of nitrification rates were registered at intermediary saline sites, where there was a higher availability of NH4+. This study revealed important insights on the effect of salinity on estuarine prokaryotic diversity structure as well on the dynamics of key processes of the nitrogen cycle.
Estuários são ecossistemas aquáticos altamente dinâmicos, possuindo grandes gradientes físicos e químicos, como é o caso da salinidade, influenciando as comunidades microbianas em termos de diversidade e abundância. A análise das respostas e adaptações destas comunidades às flutuações ambientais torna-se essencial para a compreensão dos ciclos biogeoquímicos que regulam estes ecossistemas, que tem vindo nos últimos anos a sofrer pressões ambientais devido à crescente atividade antropogénica. Neste estudo, investigámos a dinâmica da diversidade de Archaea e Bacteria ao longo de um gradiente de salinidade no estuário do Rio Douro (NW, Portugal). As amostras foram recolhidas em quatro locais cobrindo um gradiente de salinidade que variou entre 4.9 - 21.7 ppt. A aplicação da técnica de electroforese em gel com gradiente desnaturante (DGGE), revelou uma variação na diversidade de Bacteria e Archaea ao longo do gradiente salino. A diversidade das comunidades de Archaea com a capacidade de oxidar a amónia (AOA) foi também avaliada através da análise de diversidade do gene funcional amoA. Paralelamente, foram avaliados os fluxos líquidos dos compostos de azoto inorgânico (NH4+, NO3-, NO2-) bem como as taxas de nitrificação através da utilização do método do acetileno e da análise isotópica de 15N. Os resultados mostraram que apesar de ter ocorrido um aumento da diversidade das AOA com a diminuição da salinidade, as maiores magnitudes das taxas de nitrificação foram registadas nos locais com salinidades intermédias, onde se registou maior disponibilidade de NH4+. Este estudo permitiu-nos obter importantes conhecimentos sobre o efeito da salinidade na estrutura das comunidades procariotas estuarinas bem como na dinâmica de processos chave do ciclo do azoto.

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Agrella, Karen. "Nitrogen transformations in South African soils". Diss., University of Pretoria, 2001. http://hdl.handle.net/2263/23565.

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Moschonas, Grigorios. "Dissolved organic nitrogen dynamics and influence on phytoplankton". Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=228584.

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A balanced nitrogen (N) cycle is paramount for the ecology and biogeochemistry of planet Earth. Human activities are now causing an imbalance in the N cycle, with several negative effects on the marine environment. However, our knowledge of the marine N cycle remains incomplete, especially with regards to the role of dissolved organic N (DON). Therefore, there is need to study the role of DON more extensively to aid in restoring balance to Earth's ecosystems and biogeochemical cycles. This project investigated DON dynamics and influence on phytoplankton in coastal and shelf seas (CSS) to the west of Britain where DON was understudied. First, selected methods for the measurement of N uptake rates, urea and dissolved free amino acid (DFAA) concentrations were reviewed and tested. Then, they were used to study the spatial and temporal DON dynamics in the shelf region to the west of Britain (Irish Sea and adjacent shelf), the in-situ seasonal DON dynamics and N uptake in relation to phytoplankton community composition and abundance in Loch Creran, and the influence of DON on the phytoplankton community composition and abundance in controlled nutrient uptake kinetics and growth experiments and ecosystem modelling. The main findings were: DON was important in the N dynamics of the Irish Sea and adjacent shelf waters; DON was correlated with changes in phytoplankton community composition in Loch Creran; its seasonal cycle suggested its importance as an N source for the development of the spring bloom; these ideas were further supported by controlled laboratory experiments and ecosystem modelling.

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Tekin, Elif. "Anaerobic Ammonium Oxidation in Groundwater Contaminated by Fertilizers". Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/23956.

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Anaerobic ammonium oxidation (anammox) is a pathway that has been known for almost 2 decades, but few studies have investigated its importance in natural groundwaters. This thesis investigated the presence of anammox cells and the groundwater geochemistry of 2 sites (Elmira and Putnam) in southwestern Ontario where groundwaters are contaminated with high levels of nitrate and ammonium. Fluorescence in situ hybridization (FISH) was used to quantify the relative abundance of anammox cells in these waters. Our results showed that anammox cells could be detected in many wells at both sites and that their relative abundance varied between 0.45 and 4.81 % at the Putnam site, whereas it ranged between 0.8 to 8.4 % at the Elmira site. These values are within the same range as those obtained for marine and freshwater environments where anammox cells have been detected. In addition, indirect observations point to the fact that N cycling at the 2 sites might be linked to Fe and Mn reduction, but additional experiments are needed. In summary, our results corroborate the findings of N-labeled microcosm experiments which demonstrated that anammox was an important pathway of N cycling in those groundwaters and molecular analyses that detected important anammox organisms at the same sites.

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Franklin, Oskar. "Plant and forest dynamics in response to nitrogen availability /". Uppsala : Swedish University of Agricultural Sciences, 2003. http://diss-epsilon.slu.se/archive/00000345/.

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Thesis (doctoral)--Swedish University of Agricultural Sciences, 2003.
Appendix consists of reprints of three papers and a manuscript, three of which are co-authored with others. Includes bibliographical references. Also partially issued electronically via World Wide Web in PDF format; online version lacks appendix.

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Mielke, Nora. "The role of nitrogen and phosphorus in carbon and nutrient cycling of bryophyte-dominated exosystems". Thesis, University of Aberdeen, 2016. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=231758.

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Bryophytes form an important component of northern vegetation communities. Mosses efficiently capture aerially deposited nutrients, restricting nutrient availability to the soil. Given that key ecosystem processes of northern ecosystems are nutrient-limited, understanding nutrient cycling of the moss layer is key to understanding ecosystem nutrient and C cycling in these systems. However, the role of the moss layer in regulating ecosystem-scale nutrient and C cycling, while potentially significant, is largely unknown. The aim of this thesis is to investigate the effect of the relative availability of N and P on aspects of bryophyte nutrient uptake, retention and C acquisition. The hypothesis investigated is that the availability of one nutrient will influence the demand for the other and thereby moss nutrient acquisition and retention mechanisms. To test this hypothesis, various aspects of moss nutrient cycling in response to the relative availability of N and P were investigated. As the C cycle is tightly linked to the N and P cycles, the hypothesis extended to include bryophyte C assimilation and decomposition processes of an arctic tundra. Bryophyte nutrient demand was chiefly governed by the tissue N:P ratio. Consequently, nutrient uptake, both from aerially deposited nutrients and through moss-cyanobacteria N2 fixation, and nutrient losses after a simulated rainfall event were mostly in response to the relative availability of N and P rather than the availability of one nutrient alone. This thesis provides novel evidence that ectohydric mosses have the ability to internally translocate nutrients. In conjunction with efficient nutrient capture, this trait makes mosses strong nutrient sinks which are likely to exert considerable control over ecosystem nutrient cycling. The relative availability of N and P played a role in C uptake of mosses. Through the production of recalcitrant litter and their insulating effect on soil microclimate mosses exerted an influence over ecosystem C cycling.

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Libri sul tema "Nitrogen cycle"

1

Slade, Suzanne. The nitrogen cycle. New York: Rosen Pub. Group's PowerKids Press, 2007.

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2

1957-, Rup Lal, e Sukanya Lal, a cura di. Pesticides and nitrogen cycle. Boca Raton, Fla: CRC Press, 1988.

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3

Golterman, Han L., a cura di. Denitrification in the Nitrogen Cycle. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4757-9972-9.

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4

Newton, William Edward, Stuart Ferguson e Hermann Bothe. Biology of the nitrogen cycle. Amsterdam [etc.]: Elsevier, 2007.

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5

Sukanya, Lal, a cura di. Pesticides and the nitrogen cycle. Boca Raton, Fla: CRC Press, 1988.

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6

NATO Advanced Research Workshop on Denitrification in the Nitrogen Cycle (1983 Braunschweig, Germany). Denitrification in the nitrogen cycle. New York: Plenum Press, 1985.

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7

L, Golterman Han, e NATO Scientific Affairs Division, a cura di. Denitrification in the nitrogen cycle. New York: Published in cooperation with NATO Scientific Affairs Division (by) Plenum, 1985.

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8

Lal, Rup. Pesticides and the nitrogen cycle. A cura di Lal Sukanya. Boca Raton, Fla: CRC Press, 1988.

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Sukanya, Lal, a cura di. Pesticides and the nitrogen cycle. Boca Raton, Fla: CRC Press, 1988.

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10

1940-, Bothe H., Ferguson S. J. 1949- e Newton William E. 1938-, a cura di. Biology of the nitrogen cycle. Amsterdam: Elsevier, 2007.

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Capitoli di libri sul tema "Nitrogen cycle"

1

Palta, Monica M., e Hilairy E. Hartnett. "Nitrogen Cycle". In Encyclopedia of Earth Sciences Series, 1–6. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39193-9_160-1.

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Palta, Monica M., e Hilairy Ellen Hartnett. "Nitrogen Cycle". In Encyclopedia of Earth Sciences Series, 987–91. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-39312-4_160.

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3

Gooch, Jan W. "Nitrogen Cycle". In Encyclopedic Dictionary of Polymers, 910. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_14324.

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4

Arbestain, M. Camps, F. Macías, W. Chesworth, Ward Chesworth, Otto Spaargaren e Johnson Semoka. "Nitrogen Cycle". In Encyclopedia of Soil Science, 491–94. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-3995-9_381.

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5

Parades-Aguilar, Jonathan, F. Javier Almendariz-Tapia, Roberto Vaázquez-Euáan, Marco A. López-Torres, Luis R. Martínez-Córdova e Kadiya Calderón. "Nitrogenized and Chlorinated Compounds Pollutants From Industrial Wastewater: Their Environmental Impacts and Bioremediation Strategies". In Nitrogen Cycle, 203–21. First edition. | Boca Raton : CRC PRESS, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429291180-9.

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Purswani, Jessica, e Clementina Pozo Llorente. "Nitrification and Denitrification Processes: Environmental Impacts". In Nitrogen Cycle, 60–81. First edition. | Boca Raton : CRC PRESS, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429291180-4.

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Sánchez, Mercedes García, Sergio Saia e Elisabet Aranda. "The Contribution of Fungi and Their Lifestyle in the Nitrogen Cycle". In Nitrogen Cycle, 82–101. First edition. | Boca Raton : CRC PRESS, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429291180-5.

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Good, Allen G., e Ray Dixon. "the Nitrogen Fixation Dream: the Challenges and the Future". In Nitrogen Cycle, 22–33. First edition. | Boca Raton : CRC PRESS, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429291180-2.

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Rodriguez-Sanchez, Alejandro, Beatriz Gil-Pulido, Alan Dobson e Niall O’Leary. "Anaerobic Removal of Nitrogen: Nitrate-Dependent Methane Oxidation and Bioelectrochemical Processes". In Nitrogen Cycle, 245–63. First edition. | Boca Raton : CRC PRESS, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429291180-11.

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Fenice, Massimiliano. "The Nitrogen Cycle: An Overview". In Nitrogen Cycle, 1–21. First edition. | Boca Raton : CRC PRESS, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429291180-1.

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Atti di convegni sul tema "Nitrogen cycle"

1

Kmet, Tibor. "Neural Network Simulation Of Nitrogen Transformation Cycle". In 23rd European Conference on Modelling and Simulation. ECMS, 2009. http://dx.doi.org/10.7148/2009-0352-0358.

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Rasappan, Suresh, e Kala Raja Mohan. "Stability analysis of nitrogen cycle with exponential growth". In THE 11TH NATIONAL CONFERENCE ON MATHEMATICAL TECHNIQUES AND APPLICATIONS. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5112212.

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3

Kim, Mungyu, Youngrae Kim, Minseok Kim, Minki Kim, Kihwan Lee, Hyobin Kim, Donghun Lee e Joonho Min. "Advanced Liquefaction Cycle for Natural Gas". In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77236.

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This paper presents a LNG Liquefaction cycle configuration using two stages of methane expansion and a single stage of nitrogen expansion (Dual Refrigerant) to improve the efficiency of the conventional methane and nitrogen refrigerant expansion cycle (Niche Cycle). The chosen configuration further optimizes the composite cooling and heating curve of the liquefaction cycle, resulting in a higher thermodynamic efficiency. The production efficiency of the liquefaction cycle can be improved by reducing the interval between the cooling curve of the natural gas and the warming curve of the refrigerant: the closer both curves are, the better the efficiency of the cycle. This optimization is achieved by adjusting the refrigerant operating temperatures and pressures. The advanced dual refrigerant expansion cycle includes three levels of expansion, each having different temperature and pressure levels. In the methane expansion loop there are two stages, which are classified warm and cold. The warm loop is applied in the pre-cooling zone and the cold loop is responsible for the main liquefaction. The nitrogen loop is a single stage and is used for sub-cooling. This configuration allows the methane and nitrogen warming curve to closely match the cooling curve of the natural gas cooling curve by changing the methane and nitrogen warming curve from two straight lines into multiple intersecting straight lines of different gradient. That is to say, the additional new methane expander generates an added inflection point within the cold composite curve. As a result, thermodynamic inefficiencies are minimized and the power requirements are reduced when compared to Niche Cycle. In comparison with other previous expansion cycles, the cycle efficiency has increased approximately from 13.13 to 12.08 kW/ton/day (8% efficiency increase) assuming similar feed gas (methane: 80%, MW: 21.38). The composition of this feed gas is representative for associated gas or pipe line gas which is preliminary treated to remove bulk water and hydrocarbon condensate. A case study is presented for an open sea associated gas FLNG concept, comparing three kinds of liquefaction processes (Double Nitrogen Expansion Cycle, Methane & Nitrogen Expansion Cycle and Developed Dual Refrigerant Expansion Cycle). A Life Cycle Cost (LCC) analysis based on Net Positive Value (NPV) also shows an improvement in terms of project NPV, against a minor increment of the CAPEX of these cycles.

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4

Zhao, X. "Nitrogen Cycle Perturbation During the Paleocene-Eocene Thermal Maximum". In IMOG 2023. European Association of Geoscientists & Engineers, 2023. http://dx.doi.org/10.3997/2214-4609.202333276.

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5

Sanavbarov, R. I., A. V. Zaitsev e D. V. Artemyev. "Analysis of natural gas liquefiers with nitrogen circulation cycle". In OIL AND GAS ENGINEERING (OGE-2022). AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0140601.

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6

Kim, Mungyu, Komla Mihaeye, Joonho Min, Donghun Lee, Hyunki Park, Jonghun Lee, Xuan Chi Nguyen, Cees de Regt, JungHoon Kim e Jungmoon Jang. "Optimization of Nitrogen Liquefaction Cycle for Small/Medium Scale FLNG". In Offshore Technology Conference. Offshore Technology Conference, 2017. http://dx.doi.org/10.4043/27737-ms.

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7

Benedict, Tom, Jeff Ward e Gregory Barrick. "Converting a liquid nitrogen-cooled camera to closed-cycle cooling". In SPIE Astronomical Telescopes + Instrumentation, a cura di Ian S. McLean, Suzanne K. Ramsay e Hideki Takami. SPIE, 2010. http://dx.doi.org/10.1117/12.858178.

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8

Wang, Jianqun, Xingyi Xu e Xiaoli Hu. "Study on Water and Nitrogen Cycle in Jurong Reservoir Catchment". In 2012 2nd International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2012. http://dx.doi.org/10.1109/rsete.2012.6260758.

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9

Yin, Q. S., H. Y. Li, Q. H. Fan, L. X. Jia, J. G. Weisend, John Barclay, Susan Breon et al. "ECONOMIC ANALYSIS OF MIXED-REFRIGERANT CYCLE AND NITROGEN EXPANDER CYCLE IN SMALL SCALE NATURAL GAS LIQUEFIER". In ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the Cryogenic Engineering Conference - CEC, Vol. 52. AIP, 2008. http://dx.doi.org/10.1063/1.2908467.

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10

Hetz, Andrew A., e David J. Shotts. "Nitrogen Oxides Control Selection for a Utility Combined Cycle Power Plant". In 1987 Joint Power Generation Conference: GT Papers. American Society of Mechanical Engineers, 1987. http://dx.doi.org/10.1115/87-jpgc-gt-3.

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Recently, the combined cycle gas turbine has become a leading candidate among generating alternatives. Under the Clean Air Act, all utility-scale gas turbines must undergo air quality permitting before construction. Owners of these turbines must satisfy the requirements of either the federal Non-attainment program or the Prevention of Significant Deterioration program, depending on the air quality of the region. Both programs require that an analysis of applicable pollutant controls be included in the permit application. This paper presents a determination of the best available control technology for nitrogen oxide emissions from two proposed combined cycle gas turbines. Each possesses a 210 MW generating capability: 145 MW are produced by a GE MS-7001F gas turbine and 65 additional megawatts by a heat recovery steam generator and steam turbine. Detailed analyses of economic, environmental, and energy impacts are given for two technologies: selective catalytic reduction and steam injection. The study concludes that steam injection to meet the Environmental Protection Agency’s New Source Performance Standards provides the most effective means of control for nitrogen oxides. Other means of nitrogen oxides control are eliminated on the basis of technical feasibility.

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Rapporti di organizzazioni sul tema "Nitrogen cycle"

1

Boteva, Nikoleta, Nils-Kåre Birkeland e Margarita Kambourova. Complete Nitrogen Cycle Driven by the Thermophilic Microbial Community of Rupi II Hot Spring. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, gennaio 2021. http://dx.doi.org/10.7546/crabs.2021.01.08.

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Clarke, James, Ashley Cutshaw, Joseph Chou, Michelle Krynock e Gregory Cooney. U.S. Average Nitrogen Fertilizer Production Baseline Documentation For 45Q Life Cycle Analysis, Version 1.0 (2018-2022). Office of Scientific and Technical Information (OSTI), giugno 2024. http://dx.doi.org/10.2172/2405040.

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3

Weber, T. UNIQUE METHOD FOR LIQUID NITROGEN PRECOOLING OF A PLATE FIN HEAT EXCHANGER IN A HELIUM REFRIGERATION CYCLE. Office of Scientific and Technical Information (OSTI), giugno 2004. http://dx.doi.org/10.2172/826995.

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4

Jurkevitch, Edouard, Carol Lauzon, Boaz Yuval e Susan MacCombs. role of nitrogen-fixing bacteria in survival and reproductive success of Ceratitis capitata, the Mediterranean fruit fly. United States Department of Agriculture, settembre 2005. http://dx.doi.org/10.32747/2005.7695863.bard.

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Objectives: to demonstrate nitrogen fixation in the gut of Ceratitiscapitata, the Mediterranean fruit fly and that fixed nitrogen is important for the fly. Background: Fruit flies (Diptera: Tephritidae) are a highly successful, widespread group of insects causing enormous economic damage in agriculture. They are anautogenous, i.e. the acquisition of nitrogenous compounds by both male and female is essential for the realization of their reproductive potential. Nitrogen, although abundant in the atmosphere, is paradoxically a limiting resource for multicellular organisms. In the Animalia, biological nitrogen fixation has solely been demonstrated in termites. Major achievements and conclusions: We found that all individuals of field-collected medflies harbor large diazotrophicenterobacterial populations that express dinitrogenreductase in the gut. Moreover, nitrogen fixation was demonstrated in isolated guts and in live flies and may significantly contribute to the fly’s nitrogen intake. Specific components of these communities were shown to be transmitted vertically between flies. Moreover, we found that the gut bacterial community changes during the fly’s active season both in composition and complexity. Moreover, strong changes in community structure were also observed between the fly's various developmental stages. An initial analysis using SuPERPCR, a technology enabling the detection of minor populations by selective elimination of the dominant 16S rDNA sequences revealed that Pseudomonasspp. may also be part of the gut community. Implications: The presence of similar bacterial consortia in additional insect orders suggests that nitrogen fixation occurs in vast pools of terrestrial insects. On such a large scale, this phenomenon may have a considerable impact on the nitrogen cycle.

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DeBruyn, Jennifer. Data from "Nitrogen-cycle genes and transcripts abundances under agricultural management practices in a long-term continuous cotton field". University of Tennessee, Knoxville Libraries, 2018. http://dx.doi.org/10.7290/7wp5rstodb.

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6

McCarthy, James, e Tom McGrath. PR-312-12210-R01 CEPM Monitoring Plan for Two-Stoke Cycle Lean Burn Engines. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), marzo 2019. http://dx.doi.org/10.55274/r0011564.

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In response to ozone and nitrogen dioxide (NO2) National Ambient Air Quality Standards (NAAQS), it is anticipated that there will be continued pressure for retrofit NOx control of existing slow speed integral reciprocating engines. This will likely require the retrofit of many additional legacy lean burn pipeline engines over the next decade, and emissions controls will require compliance verification which has been historically based on periodic emission tests. However, agencies also desire continuous "monitoring" of an operating parameter or parameters indicative of engine status. This document describes a method for ensuring a reciprocating engine with emission controls is operating properly. Continuous engine performance monitoring (CEPM) using on-engine sensors can provide early identification of potential engine operational issues, while also assuring the engine is operating within an acceptable operating envelope consistent with acceptable emissions performance. CEPM can reduce maintenance and compliance costs. This report provides the foundation for lower cost compliance assurance using CEPM.

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Christenson, Erleen. Effect of copper on cell division, nitrogen metabolism, morphology, and sexual reproduction in the life cycle of Closterium moniliferum (Chlorophyceae). Portland State University Library, gennaio 2000. http://dx.doi.org/10.15760/etd.54.

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8

Ji, Yi, Bob McCullouch e Zhi Zhou. Evaluation of Anti-Icing/De-Icing Products Under Controlled Environmental Conditions. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317253.

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Snow and ice removal are important tasks during the winter season and large amounts of anti-icing and de-icing chemicals are used and there is a critical need to review and synthesize information from the literature to compare and contrast anti-icing and de-icing chemicals to understand their environmental impact and support decision making. The effectiveness, costs, and environmental impact of commonly used and alternative anti-icing and de-icing chemicals were reviewed in this study. Application of anti-icing and de-icing chemicals may increase ion concentrations in soils and change nitrogen cycle, soil pH, and trace metal concentrations, affect surface water and groundwater, and increase public health risks. Life cycle assessment was conducted to quantitively evaluate environmental impact of selected anti-icing and de-icing chemicals. A decision support tool on environmental impact was developed to evaluate environmental impact of anti-icing and de-icing chemicals in ten different environmental impact categories. The results showed the environmental life cycle assessment tool developed in this study can be used to compare multiple environment impacts to support decision making for winter operation chemicals.

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Nowlin, Jacob, Kevin Wallace, Kyle Beurlot, Mark Patterson e Timothy Jacobs. PR-457-21206-R01 CFD Study of Prechamber NOx Production Mechanisms. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), luglio 2023. http://dx.doi.org/10.55274/r0000027.

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Use of the pre-combustion chamber (PCC) as an ignition source in large-bore natural gas engines has shown promise in reducing emissions. By increasing the ignition energy and surface area via a turbulent jet, these devices can extend the lean operating limit of the engine and reduce oxides of nitrogen (NOx). This study aims to characterize the sensitivity of main chamber NOx formation to changes in the PCC jet. A CFD model of a Cooper-Bessemer GMV two-stroke lean-burn natural gas engine is used for this purpose. The temperature and chemical composition of the PCC jet are varied across several tasks, and the resulting changes in main chamber NO and shy;x emissions are recorded. Three-dimensional plotting tools are used to determine where and when NOx forms in the engine during the cycle. Data on the chemical pathways to NO and NO2 and shy; and shy; formation and destruction is also presented.

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10

VanZomeren, Christine, Kevin Philley, Nia Hurst e Jacob Berkowitz. Wildrice (Zizania palustris; Manoomin) biology, functions and values, and soil physiochemical properties affecting production : a review of available literature. Engineer Research and Development Center (U.S.), agosto 2023. http://dx.doi.org/10.21079/11681/47513.

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Wildrice (Zizania palustris L.) is an annual aquatic emergent plant primarily distributed across portions of Minnesota, Wisconsin, Michigan, and Canada. Wildrice requires narrow environmental conditions that vary throughout its life cycle. Environmental conditions required include water levels between 15 and 90 cm, slow flowing water, anaerobic soil, and circum-neutral pH. Wildrice production and abundance is most often limited by nitrogen availability. Both short- and long-term changes in local conditions impact distribution and abundance of wildrice at local and regional scales. Reported declines in wildrice production have increased interest in evaluating changing environmental conditions, specifically within the Upper Peninsula of Michigan. Wildrice, or manoomin, is an important food and cultural resource, and remains important to native peoples throughout the region, including the Lac Vieux Desert Band of Lake Superior Chippewa Indians. This report provides a review of literature related to wildrice and examines potential factors affecting its production in the Upper Peninsula of Michigan. This report highlights cultural and traditional values, functions and values of wildrice, and unique chemical and physical aspects of the environment where wildrice grow. Additionally, this report synthesizes the data gathered in the literature review, identifies knowledge gaps, and provides research opportunities for improved wildrice production in the Great Lakes region.

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