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Relevant bibliographies by topics / Chemistry [mesh]

Academic literature on the topic 'Chemistry [mesh]'

Author: Grafiati

Published: 26 July 2024

Last updated: 27 July 2024

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Journal articles on the topic "Chemistry [mesh]"

1

Service, R. F. "CHEMISTRY: To Net Big Molecules, Widen the Mesh." Science 296, no. 5567 (April 19, 2002): 449b—451. http://dx.doi.org/10.1126/science.296.5567.449b.

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Bitner, Daniel P., and Filippo Filicori. "Mesh or no mesh in anti-reflux surgery." Mini-invasive Surgery 6 (2022): 46. http://dx.doi.org/10.20517/2574-1225.2022.46.

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3

Torshin, I. Yu, O. A. Gromova, and L. A. Maiorova. "The prospects for the use of vitamin B12 derivatives in pharmacology." FARMAKOEKONOMIKA. Modern Pharmacoeconomics and Pharmacoepidemiology 16, no. 3 (November 10, 2023): 501–11. http://dx.doi.org/10.17749/2070-4909/farmakoekonomika.2023.198.

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Background. The structure of corrin tetrapyrrole macrocycles (compounds similar in structure to vitamin B12) is a kind of universal chemical template for targeted drug delivery, and the development of chemical sensors and antidotes.Objective: systematization of information on targeted modulation of certain corrins’ properties through chemical modifications.Material and methods. Literature analysis using modern methods of topological and metric data analysis was carried out. All relevant publications (n=863) were extracted from the PubMed/MEDLINE database on request “(cobalamin OR Cobyrinic OR vitamin B12) AND (Molecular Conformation [MeSH Terms] OR Vitamin B 12/*analogs & derivatives/*chemistry [MeSH Terms] OR Vitamin B 12/*chemistry [MeSH Terms] OR Structure-Activity Relationship [MeSH Terms])”.Results. Information was systematized on how it is possible to regulate the properties of vitamin B12 (cobalamin) derivatives by introducing specific substitutions of groups in the corrin ring, on chemical modifications of cobalamin derivatives, biosynthetic approaches to the synthesis of cobalamin derivatives, and the effects of interactions of these modified corrins with “small” inorganic and organic molecules.Conclusion. The results obtained by systematic computer analysis of publications on corrins make it possible to reasonably form samples of candidate molecules for corrin studies in silico, in vitro, and in vivo.

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Zhou, Tiantian, Jinyan Wang, Jonathan D. Todd, Xiao-Hua Zhang, and Yunhui Zhang. "Quorum Sensing Regulates the Production of Methanethiol in Vibrio harveyi." Microorganisms 12, no. 1 (December 24, 2023): 35. http://dx.doi.org/10.3390/microorganisms12010035.

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Methanethiol (MeSH) and dimethyl sulfide (DMS) are important volatile organic sulfur compounds involved in atmospheric chemistry and climate regulation. However, little is known about the metabolism of these compounds in the ubiquitous marine vibrios. Here, we investigated MeSH/DMS production and whether these processes were regulated by quorum-sensing (QS) systems in Vibrio harveyi BB120. V. harveyi BB120 exhibited strong MeSH production from methionine (Met) (465 nmol mg total protein−1) and weak DMS production from dimethylsulfoniopropionate (DMSP) cleavage. The homologs of MegL responsible for MeSH production from L-Met widely existed in vibrio genomes. Using BB120 and its nine QS mutants, we found that the MeSH production was regulated by HAI-1, AI-2 and CAI-1 QS pathways, as well as the luxO gene located in the center of this QS cascade. The regulation role of HAI-1 and AI-2 QS systems in MeSH production was further confirmed by applying quorum-quenching enzyme MomL and exogenous autoinducer AI-2. By contrast, the DMS production from DMSP cleavage showed no significant difference between BB120 and its QS mutants. Such QS-regulated MeSH production may help to remove excess Met that can be harmful for vibrio growth. These results emphasize the importance of QS systems and the MeSH production process in vibrios.

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Suciu, Bogdan Andrei, Ioana Halmaciu, Decebal Fodor, Cristian Trambitas, Adrian Ivanescu, Dumitru Godja, Vlad Vunvulea, Calin Molnar, and Klara Brinzaniuc. "Comparative Study on the Efficiency of 2 Different Types of Meshes (Polypropylene and ProGripTM ) in the Surgical Treatment of Incisional Hernias." Materiale Plastice 55, no. 2 (June 30, 2018): 152–55. http://dx.doi.org/10.37358/mp.18.2.4984.

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Postoperative eventration is a quite common condition in patients with clinical records of abdominal surgery. The purpose of this study was to investigate the efficacy of use of 2 different types of meshes (Polypropylene mesh and ProGripTM mesh-self-gripping mesh) in the surgical treatment of incisional hernias. In this respect, we conducted a study in which we introduced 128 patients operated for incisional hernias. Patients were divided into 2 lots: group A (102 patients with polypropylene mesh) and group B (26 patients with ProGripTM mesh). From the analysis of the data studied, we noticed that the average duration of surgery and hospitalization for patients with ProGripTM mesh is lower compared to patients with polypropylene mesh. Also, the rate of local postoperative complications was lower when using the ProGripTM mesh (15.38%) than in the case of polypropylene mesh. In conclusion, we can state that the use of the ProGripTM heterologous mesh is beneficial in the surgical treatment of patients with incisional hernias. The major advantage of using this type of mesh is given by a shorter hospitalization period for these patients, as well as by a lower rate of local postoperative complications in these patients.

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Arsad, Effendi. "SIFAT FISIK DAN KIMIA WOOD PELLET DARI LIMBAH INDUSTRI PERKAYUAN SEBAGAI SUMBER ENERGI ALTERNATIF." Jurnal Riset Industri Hasil Hutan 6, no. 1 (July 1, 2014): 1. http://dx.doi.org/10.24111/jrihh.v6i1.1219.

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Carakteristic physical and chemistry of Wood pellet from Industrial Disposal of Wood as Sources Energy Alternatif The research to gaved for physical and chemistry of Wood pellet from Industrial. Processing approximately 12%, sawdust dried to moisture content of sieved that is size of 15 mesh, 25 mesh and 35 mesh. Heating temperature were 60 0C and 110 0C. Moisture content of flawer wood pellet 4,46% - 9,95%, acacia wood pellet were 4.38% - 7.52% and tarap wood pellet were 4.60% - 9.98%. Density of flawer wood pellet were 0.51 - 0.78, acacia wood pellet were 0.61 - 0.78 and tarap wood pellet were 0.56 - 0.71, ash content of wood flawer from 0.87 - 2.04%, acacia 0.54 - 0.94% and ash content of tarap wood 1.71 - 2.05%. Calorific value of wood pellets flawers wood 3921,12 - 4150,19 cal/g, acacia wood 4022,29 - 4254,91 cal/g and tarap wood 3920,13 - 4125,28 cal/g. The higher temperature of the heating effect on reality the reduction of water and the weight of ash wood pellets while it was increasing calorific value.Keywords: waste wood, flawers wood, acacia wood, tarap wood, wood pellet

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Noditi, George, Raul Zoler, Gheorghe Noditi, and Lazar Fulger. "Synthetic Mesh for Large Ventral Hernia Repair Correlated with Evaluation of Quality-of-life A 5 years retrospective study." Revista de Chimie 69, no. 5 (June 15, 2018): 1264–67. http://dx.doi.org/10.37358/rc.18.5.6304.

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Ventral hernia mesh repair is considered a standard procedure in most countries and widely accepted as superior to primary suture repair. We conducted a 5 years retrospective observational study on large and giant incizional hernia repair in our Clinics. 176 consecutive patients who had a ventral hernia repair with mesh implant in 2012-2016 were evaluated in terms of demographic characteristics, comorbidities, surgical conditions (defect size, mesh type, positioning of the mesh, length of hospital) and surgical outcomes by means of EuraHS-QoL score pre- and 30 days postoperative to assess quality of life (Qol). Alloplastic substitution with polypropylene, polyester and Dacron mesh has been used in all cases. Polypropylene mesh has been used in most of cases (91%). Most preferred mesh position was intraperitoneal (78%), then retromuscular (15%) and preperitoneal (7%). Immediate postoperative complications appeared in 41 cases (23.3%). Mean hospital length was 14,3 days. We could notice a double pre- and postoperative difference for the pain, with statistical significance (2.71�1.70; p=0.23) and the same pattern of distribution for restriction of activities and for cosmetic discomfort.

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Garcia-Lovella, Yaniel, Idalberto Herrera-Moya, Manuel A. Rubio-Rodríguez, and Jeevan Jayasuriya. "Assessment of LES Dynamic Smagorinsky-Lilly model resolution for combustion engineering applications." DYNA 90, no. 225 (March 14, 2023): 95–104. http://dx.doi.org/10.15446/dyna.v90n225.103219.

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Large Eddy Simulation (LES) has become a powerful tool for dealing with turbulence. Nevertheless, mesh resolution of the simulated domain under the LES approach was shown to be a key matter. Critical regions should maintain an adequate mesh resolution and also the highest possible quality. LES with the Dynamic Smagorisky-Lilly sub-grid model was used for the simulation of SMA1-flame, to assess the influence of the mesh resolution on the instantaneous velocity fields, species profiles, and temperatures profiles. The results of the simulation suggest a comprehensible agreement with experimental data. Nevertheless, some areas in the highly rotational velocity field are not properly solved, mainly due to a poor mesh resolution of such areas. As a result, the central jet’s decay rate was not accurately predicted. On the other hand, the temperature and species profiles were reasonably computed, considering the simple chemistry provided by the Eddy Dissipation Model (EDM).

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Wadhawan, Jay D., Peter J. Welford, Kamran Yunus, Adrian C. Fisher, and Richard G. Compton. "Voltammetry at micro-mesh electrodes." Journal of the Brazilian Chemical Society 14, no. 4 (August 2003): 510–16. http://dx.doi.org/10.1590/s0103-50532003000400004.

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Luo, Guanzhou, Li Wang, Xinying Li, Kai Yang, Yongle Luo, Shouping Xu, Pihui Pi, and Xiufang Wen. "Facile fabrication of an F-POSS polymer-based liquid-repellent Cu mesh with excellent durability and self-cleaning performance." Soft Matter 15, no. 47 (2019): 9727–32. http://dx.doi.org/10.1039/c9sm01748h.

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A facile method that combines alkali-assisted oxidation and –SH chelation with a click chemistry reaction was employed to create an F-POSS polymer surface (fluorinated octavinyl polyhedral oligomeric silsesquioxane polymer)-based Cu mesh (F-POSS-OM).

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Dissertations / Theses on the topic "Chemistry [mesh]"

1

Messenbock, Reinhard Christoph. "Rapid pyrolysis and gasification of coal in a high-pressure wire-mesh reactor." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/7740.

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Heer, Joseph Michael. "FDTD Modeling of the Spectroscopy and Resonances of Thin Films and Particles on Plasmonic Nickel Mesh." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1293754711.

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Cilwa, Katherine Elizabeth. "Surface Plasmon Polaritons and Single Dust Particles." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1301074124.

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Rodriguez, Kenneth Ralph. "The extraordinary infrared transmission of metal microarrays for enhanced absorption spectroscopy of monolayers, nanocoatings, and catalytic surface reactions." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1189549712.

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Aratani, Naoki. "Chemistry of meso-meso linked porphyrin arrays." 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/73207.

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Kitano, Masaaki. "Chemistry of meso-Free Subporphyrins." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215329.

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Tsurumaki, Eiji. "Chemistry of meso-Aryl-Substituted Subporphyrins." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/180636.

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Suzuki, Masaaki. "Chemistry of meso-aryl substituted hexaphyrins(1.1.1.1.1.1)." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136786.

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Hau, Lap Wing. "Electrokinetically-driven liquid flows in microchannels using surface-chemistry technology /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?MECH%202005%20HAU.

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Lee, Gary Peter. "Enantioselective #alpha#-deprotonation/rearrangement of meso-epoxides." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298271.

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Books on the topic "Chemistry [mesh]"

1

S, Monk Paul M., and Bradshaw Tony, eds. Chemistry for the biosciences. Oxford: Oxford University Press, 2006.

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2

Littin, G. R. Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona, 1996. Tucson, Ariz: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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Littin, G. R. Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona, 1996. Tucson, Ariz: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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Littin, G. R. Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona, 1996. Tucson, Ariz: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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5

A, Monroe S., Arizona. Dept. of Water Resources, United States. Bureau of Indian Affairs, and Geological Survey (U.S.), eds. Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona, 1996. Tucson, Ariz: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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Littin, G. R. Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona, 1996. Tucson, Ariz: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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A, Monroe S., Arizona. Dept. of Water Resources, United States. Bureau of Indian Affairs, and Geological Survey (U.S.), eds. Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona, 1996. Tucson, Ariz: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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A, Monroe S., Arizona. Dept. of Water Resources, United States. Bureau of Indian Affairs, and Geological Survey (U.S.), eds. Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona, 1996. Tucson, Ariz: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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9

Cantillo, Adriana Y. MESA New York Bight Project water column chemistry data: Cruises #6-12 of the NOAA ship Ferrel, April-November 1974. Miami, Fla: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, Atlantic Oceanographic and Meterological Laboratory, 1997.

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10

Littin, G. R. Results of ground-water, surface-water, and water-chemistry monitoring, Black Mesa area, northeastern Arizona, 1994. Tucson, Ariz: U.S. Dept. of the Interior, U.S. Geological Survey, 1995.

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Book chapters on the topic "Chemistry [mesh]"

1

Gupta, Radha Raman, Mahendra Kumar, and Vandana Gupta. "Meso-Ionic Heterocycles." In Heterocyclic Chemistry, 579–626. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-07757-3_6.

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2

Kaminski, Jacek, Lori Neary, Joanna Struzewska, and John C. McConnell. "Multiscale Atmospheric Chemistry Modelling with GEMAQ." In Integrated Systems of Meso-Meteorological and Chemical Transport Models, 55–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13980-2_4.

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3

Yen, T. F. "Meso-Scaled Structure and Membrane Mimetic Chemistry." In Advances in the Applications of Membrane-Mimetic Chemistry, 255–79. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2580-6_16.

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Lu, Xiao-Bing. "CHAPTER 6. Bimetallic Complex Mediated Meso-epoxide Desymmetrization Copolymerization." In Polymer Chemistry Series, 167–96. Cambridge: Royal Society of Chemistry, 2019. http://dx.doi.org/10.1039/9781788016469-00167.

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Zhang, Yang. "On-Line Coupled Meteorology and Chemistry Models in the US." In Integrated Systems of Meso-Meteorological and Chemical Transport Models, 15–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13980-2_2.

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6

Corma, A., and D. Kumar. "Micro- and Meso-Porous Materials as Catalysts." In New Trends in Materials Chemistry, 403–60. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5570-0_15.

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Mori, Hideharu, and Axel H. E. Müller. "Hyperbranched (Meth)acrylates in Solution, Melt, and Grafted From Surfaces." In Topics in Current Chemistry, 1–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/b11004.

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Rout, Prangya Ranjan, Puspendu Bhunia, Eunseok Lee, and Jaeho Bae. "Microbial Electrochemical Systems (MESs): Promising Alternatives for Energy Sustainability." In The Handbook of Environmental Chemistry, 223–51. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/698_2020_614.

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9

Serra, Vanda I. Vaz, Sónia M. G. Pires, Cristina M. A. Alonso, Maria G. P. M. S. Neves, Augusto C. Tomé, and José A. S. Cavaleiro. "Meso-Tetraarylporphyrins Bearing Nitro or Amino Groups: Synthetic Strategies and Reactivity Profiles." In Topics in Heterocyclic Chemistry, 35–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/7081_2013_101.

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Flemming, Johannes, A. Dethof, P. Moinat, C. Ordóñez, V. H. Peuch, A. Segers, M. Schultz, O. Stein, and M. van Weele. "Coupling Global Atmospheric Chemistry Transport Models to ECMWF Integrated Forecasts System for Forecast and Data Assimilation Within GEMS." In Integrated Systems of Meso-Meteorological and Chemical Transport Models, 109–23. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13980-2_10.

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Conference papers on the topic "Chemistry [mesh]"

1

Pomraning, Eric, Keith Richards, and P. K. Senecal. "Modeling Turbulent Combustion Using a RANS Model, Detailed Chemistry, and Adaptive Mesh Refinement." In SAE 2014 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2014. http://dx.doi.org/10.4271/2014-01-1116.

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Kumar, Gaurav, and Nitesh O. Attal. "Accurate Predictions of Flashback in a Swirling Combustor with Detailed Chemistry and Adaptive Mesh Refinement." In AIAA SCITECH 2022 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2022. http://dx.doi.org/10.2514/6.2022-1722.

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Luo, Zhaoyu, Parvez Sukheswalla, Scott A. Drennan, Mingjie Wang, and P. K. Senecal. "3D Numerical Simulations of Selective Catalytic Reduction of NOx With Detailed Surface Chemistry." In ASME 2017 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icef2017-3658.

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Environmental regulations have put stringent requirements on NOx emissions in the transportation industry, essentially requiring the use of exhaust after-treatment on diesel fueled light and heavy-duty vehicles. Urea-Water-Solution (UWS) based Selective Catalytic Reduction (SCR) for NOx is one the most widely adopted methods for achieving these NOx emissions requirements. Improved understanding and optimization of SCR after-treatment systems is therefore vital, and numerical investigations can be employed to facilitate this process. For this purpose, detailed and numerically accurate models are desired for in-cylinder combustion and exhaust after-treatment. The present paper reports on 3-D numerical modeling of the Urea-Water-Solution SCR system using Computational Fluid Dynamics (CFD). The entire process of Urea injection, evaporation, NH3 formation and NOx reduction is numerically investigated. The simulation makes use of a detailed kinetic surface chemistry mechanism to describe the catalytic reactions. A multi-component spray model is applied to account for the urea evaporation and decomposition process. The CFD approach also employs an automatic meshing technique using Adaptive Mesh Refinement (AMR) to refine the mesh in regions of high gradients. The detailed surface chemistry NOx reduction mechanism validated by Olsson et al. (2008) is applied in the SCR region. The simulations are run using both transient and steady-state CFD solvers. While transient simulations are necessary to reveal sufficient details to simulate catalytic oxidation during transient engine processes or under cyclic variations, the steady-state solver offers fast and accurate emission solutions. The simulation results are compared to available experimental data, and good agreement between experimental data and model results is observed.

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Jha, Predeep, and Clinton Groth. "Parallel Adaptive Mesh Renment Scheme with Presumed Conditional Moment and FPI Tabulated Chemistry for Turbulent Non-Premixed Combustion." In 49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-281.

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Gao, Jian, Ronald O. Grover, Venkatesh Gopalakrishnan, Ramachandra Diwakar, Wael Elwasif, K. Dean Edwards, Charles E. A. Finney, and Russell Whitesides. "Steady-State Calibration of a Diesel Engine in CFD Using a GPU-Based Chemistry Solver." In ASME 2017 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icef2017-3631.

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The prospect of analysis-driven pre-calibration of a modern diesel engine is extremely valuable in order to significantly reduce hardware investments and accelerate engine designs compliant with stricter EPA fuel economy regulations. Advanced modeling tools, such as CFD, are often used with the goal of streamlining significant portions of the calibration process. The success of the methodology largely relies on the accuracy of analytical predictions, especially engine-out emissions. However, the effectiveness of CFD simulation tools for in-cylinder engine combustion is often compromised by the complexity, accuracy, and computational overhead of detailed chemical kinetics necessary for combustion calculations. The standard approach has been to use skeletal kinetic mechanisms (∼50 species) which consume acceptable computational time but with degraded accuracy. In this work, a comprehensive demonstration and validation of the analytical pre-calibration process is presented for a passenger car diesel engine using CFD simulations with CONVERGE™ and a GPU-based chemical kinetics solver (Zero-RK, developed at Lawrence Livermore National Laboratory) on high performance computing resources to enable the use of detailed kinetic mechanisms. Diesel engine combustion computations have been conducted over 600 operating points spanning in-vehicle speed-load map, using massively parallel ensemble simulation sets on the Titan supercomputer located at the Oak Ridge Leadership Computing Facility. The results with different mesh resolutions have been analyzed to compare differences in combustion and emissions (NOx, Carbon Monoxide CO, Unburned Hydrocarbons UHC, and Smoke) with actual engine measurements. The results show improved agreement in combustion and NOx predictions with a large n-heptane mechanism consisting of 144 species and 900 reactions with refined mesh resolution; however; agreement in CO, UHC and Smoke remain a challenge.

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Liu, Shuaishuai, Gaurav Kumar, Mingjie Wang, and Eric Pomraning. "Towards Accurate Temperature and Species Mass Fraction Predictions for Sandia Flame-D using Detailed Chemistry and Adaptive Mesh Refinement." In 2018 AIAA Aerospace Sciences Meeting. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-1428.

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Mehl, Cédric, Shuaishuai Liu, Yee Chee See, and Olivier Colin. "LES of a stratified turbulent burner with a Thickened Flame Model coupled to Adaptive Mesh Refinement and detailed chemistry." In 2018 Joint Propulsion Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-4563.

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Gomez-Soriano, Josep, Pradeep Sapkota, Sameera Wijeyakulasuriya, Matteo D'Elia, Daniel Probst, Veeraraghavan Viswanathan, Miguel Olcina-Girona, and Ricardo Novella. "Numerical Modeling of Hydrogen Combustion Using Preferential Species Diffusion, Detailed Chemistry and Adaptive Mesh Refinement in Internal Combustion Engines." In 16th International Conference on Engines & Vehicles. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2023. http://dx.doi.org/10.4271/2023-24-0062.

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<div class="section abstract"><div class="htmlview paragraph">Mitigating human-made climate change means cutting greenhouse gas (GHG) emissions, especially carbon dioxide (CO<sub>2</sub>), which causes climate change. One approach to achieving this is to move to a carbon-free economy where carbon emissions are offset by carbon removal or sequestration. Transportation is a significant contributor to CO<sub>2</sub> emissions, so finding renewable alternatives to fossil fuels is crucial. Green hydrogen-fueled engines can reduce the carbon footprint of transportation and help achieve a carbon-free economy. However, hydrogen combustion is challenging in an internal combustion engine due to flame instabilities, pre-ignition, and backfire. Numerical modeling of hydrogen combustion is necessary to optimize engine performance and reduce emissions. In this work, a numerical methodology is proposed to model lean hydrogen combustion in a turbocharged port fuel injection (PFI) spark-ignition (SI) engine for automotive applications. The numerical method is based on 3D Computational Fluid Dynamics (CFD) simulations where Hydrogen injection is modeled using a mass flow boundary condition in the intake port, preferential species diffusion is used to model fuel-air mixing, and a 12 species, 37 reactions reduced chemical kinetics mechanism is used to model combustion with a detailed chemistry solver. Results shows good validation against measured multiple cycle cylinder pressure data for several operating conditions including varying load and equivalence ratios. The conventional methodology to simulate multiple engine cycles consecutively can be time consuming, hence, this paper evaluates the concurrent perturbation method which allows for simulating multiple cycles simultaneously in significantly less wall clock time.</div></div>

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Zhang, Yanna, Liangchuan Li, Fei Yan, and Yucai Wang. "The Study and Application of Seepage Reconstruction for Water Plugging in High Permeability Sandstone Reservoirs." In SPE International Conference on Oilfield Chemistry. SPE, 2023. http://dx.doi.org/10.2118/213865-ms.

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Abstract In the medium/high permeability sandstone reservoirs, long-term water flooding led to large pore channels formed in the reservoir, and the injected water quickly breaks into oil wells along the large pore channels, resulting in water cut increase rapidly and a significant reduction in water flooding efficiency. The traditional water shut-off by chemical or cement squeeze cannot reduce water cut for a long time and cannot increase oil production because they don't change the existing seepage characteristics of the reservoir. The seepage reconstruction is a combination of chemical water shut-off and fracturing technology. It involves innovation on intelligent water control materials and fracturing injection process. There are three plugging slugs, a strong plugging slug, a seepage reconstruction slug, and a tail plugging slug, should be filled into reservoir one by one. The strong plugging slug adopts inorganic polymer to shut-off the large pore by low speed injection. The seepage reconstruction slug is composed of 70-140 mesh quartz sand, 50-80um ceramist and intelligent water control materials with a ratio of 6:3:1, which is carried by low-concentration guar. The tail plugging slug is made of self-consolidated material to prevent sand returning from formation. The technology is used in G111-6 located in J oil field, which is successful in increasing oil production from 3.08bopd to 56.28bopd and reducing the water cut from 96.64% to 78%. The validity period was 492d, and the total oil production was 22624bbls. The technology of seepage reconstruction for water shut-off could effectively reduce the water cut and greatly increase the daily oil production. It effectively improves waterflood development efficiency of medium/high permeability sandstone reservoirs in high water cut stage. The innovation of this technology is the effective combination of fracturing technology and traditional chemical water shut off technology. The goals of water shut-off and oil increase are realized by innovative design of three plugging slugs. It provides a new approach for water shut-off in medium/high permeability sandstone reservoirs with high water cut.

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Naik, Chitralkumar V., Hossam Elasrag, Rakesh Yadav, Ahad Validi, and Ellen Meeks. "Impact of Combustion Models on Emissions Predictions From a Piloted Methane-Air Diffusion Flame." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5521.

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Abstract Combustion models can have a significant impact on flame simulations. While solving finite rate chemistry typically yields more accurate predictions, they depend significantly on the detailed kinetics mechanism used. To demonstrate the effect, Large Eddy Simulation (LES) of Sandia Flame D [1] has been performed using various combustion models. Four different detailed kinetics mechanisms have been considered. They include DRM mechanism with 22 species, GRI-mech 2.11 with 49 species, GRI-mech 3.0 with 53 species [2], and Model Fuel Library (MFL) mechanism with 29 species [3]. In addition to the mechanisms, two modeling approaches considered are direct integration of finite rate kinetics (FR) and Flamelet Generated Manifold (FGM). The performance is compared between combinations of the mechanisms and combustion-modeling approaches for prediction of the flame structure and pollutants, including NO and CO. The mesh contains about half a million hexahedral cells and LES statistics were collected over ten flow throughs. Advanced solvers including dynamic cell clustering using the Chemkin-CFD solver in Fluent have been used for faster simulation time. Based on comparison of simulation results to the measurements at various axial and radial positions, we find that the results using the FGM approach were comparable to those using direct integration of FR chemistry, except for NO. In general, the simulation results are in good agreement with the experiment in terms of aerodynamics, mixture fraction and temperature profiles. However, kinetics mechanisms were found to have the most pronounced effect on emissions predictions. NO was especially more sensitive to the kinetics mechanism. Both versions of the GRI-mech fell short in predicting emissions. Overall, the MFL mechanism was found to yield the closest match with the data for flame structure, CO, and NO.

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Reports on the topic "Chemistry [mesh]"

1

Results of ground-water, surface-water, and water-chemistry monitoring, Black Mesa area, northeastern Arizona, 1994. US Geological Survey, 1995. http://dx.doi.org/10.3133/wri954238.

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2

Ground-water, surface-water, and water-chemistry data, Black Mesa Area, northeastern Arizona: 2000-2001, and performance and sensitivity of the 1988 USGS numerical model of the N aquifer. US Geological Survey, 2002. http://dx.doi.org/10.3133/wri024211.

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