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Relevant bibliographies by topics / Oxidation degree

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Academic literature on the topic 'Oxidation degree'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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Journal articles on the topic "Oxidation degree"

1

Sardarly, А. М. "PHASE COMPOSITION AND OXIDATION DEGREE OF VANADIUM IN CATALYSTS FOR OXIDATIVE DEHYDROGENATION OF PROPANE." Chemical Problems 20, no. 4 (2022): 358–65. http://dx.doi.org/10.32737/2221-8688-2022-3-358-365.

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The phase composition of vanadium and vanadium-antimony-containing samples of γ-Al2O3 and the degree of oxidation of vanadium in them were examined by XRD and EPR methods, respectively. The data of XRD and EPR spectroscopy show the formation of highly dispersed vanadium-oxygen and vanadiumantimony-oxygen structures on the surface of the support. It is shown that the EPR spectra of the studied samples are due to "isolated" vanadium ions with an oxidation state of +4 in nonstoichiometric vanadium-oxygen and vanadium-antimony-oxygen formations with a square pyramid local environment structure wit

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Cao, Yingying, Lila Zhao, Fubing Wang, Huilin Su, and Limeng Zhu. "Effect of Oxidation on Physicochemical Properties and Structure of Mutton Myosin." Journal of Biobased Materials and Bioenergy 19, no. 1 (2025): 20–28. http://dx.doi.org/10.1166/jbmb.2025.2475.

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The physicochemical properties and structure of mutton myosin were investigated through the simulation of natural oxidation using a Fenton oxidation system. Various degrees of oxidation (0, 1, 5, 10, 15, and 20 mmol/L hydrogen peroxide solution) were employed to analyze the changes in myosin characteristics. The results pertaining to physicochemical properties revealed a decrease in myosin solubility and an increase in turbidity with escalating the degree of oxidation. Additionally, the water holding capacity of gels exhibited an initial increase followed by a subsequent decrease. The primary

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Burdette, D., and J. G. Zeikus. "Purification of acetaldehyde dehydrogenase and alcohol dehydrogenases from Thermoanaerobacter ethanolicus 39E and characterization of the secondary-alcohol dehydrogenase (2° Adh) as a bifunctional alcohol dehydrogenase-acetyl-CoA reductive thioesterase." Biochemical Journal 302, no. 1 (1994): 163–70. http://dx.doi.org/10.1042/bj3020163.

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The purification and characterization of three enzymes involved in ethanol formation from acetyl-CoA in Thermoanaerobacter ethanolicus 39E (formerly Clostridium thermohydrosulfuricum 39E) is described. The secondary-alcohol dehydrogenase (2 degrees Adh) was determined to be a homotetramer of 40 kDa subunits (SDS/PAGE) with a molecular mass of 160 kDa. The 2 degrees Adh had a lower catalytic efficiency for the oxidation of 1 degree alcohols, including ethanol, than for the oxidation of secondary (2 degrees) alcohols or the reduction of ketones or aldehydes. This enzyme possesses a significant a

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Li, Dahu, Fangjia Yang, Zhao Cao, Ruoqi Li, and Yiwen Hu. "The Effect of Oxidation on Coal’s Molecular Structure and the Structure Model Construction of Oxidized Coal Molecular." Processes 13, no. 1 (2025): 187. https://doi.org/10.3390/pr13010187.

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Three kinds of 1/3 coking coals with different degrees of oxidation were used for this study in Inner Mongolia, China. Using analytical testing methods such as X-ray photoelectron spectroscopy (XPS), nuclear magnetic resonance carbon spectroscopy (13C-NMR) and Fourier transform infrared spectroscopy (FT-IR), combined with computer-aided software such as Chemdraw, Materials Studio (2017), and MestRenova, three coal samples were characterized and analyzed. On this basis, the molecular formulas of three coal samples with different degrees of oxidation were constructed by optimizing the model ener

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Yin, Peng, Wen Zhou, Xin Dong, Bin Guo, and Yanan Huang. "Effect of Oxidized Wood Pulp Fibers on the Performance of the Thermoplastic Corn Starch Composites." Advances in Polymer Technology 2020 (July 8, 2020): 1–7. http://dx.doi.org/10.1155/2020/8976713.

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In this study, oxidized wood pulp fiber (OWPF) was prepared by oxidizing wood pulp fiber (WPF) with NaIO4, and OWPFs with different oxidation degrees were obtained and characterized by light microscope, XRD, and TG. Then, OWPFs with different oxidation degrees were incorporated into thermoplastic starch (TPS) to prepare OWPF/TPS composites. The cross-section morphology, water resistance, and physical and mechanical properties of the composites were investigated. SEM showed good dispersion of OWPF in the continuous TPS phase. The tensile strength of OWPF/TPS reached a maximum value of 5.02 MPa

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Volkova, Yu V., K. V. Sharun, L. L. Sukhova, H. V. Kosovtsova, S. I. Turchina, and D. A. Kashkalda. "Oxidative balance disorders as a factor of formation and progression of hypoandrogenism in boys." Ukrainian Journal of Pediatric Endocrinology, no. 1-2 (June 20, 2022): 21–25. http://dx.doi.org/10.30978/ujpe2022-1-2-21.

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Objective — to study the features of the state of oxidative balance (processes of free radical oxidation and antioxidant protection) in boys with hypoandrogenism (HA). Materials and methods. Examinations involved 103 adolescent boys agreed 14 to 17 years with the delayed sexual development. Serum levels of total testosterone (TT), conjugated dienes (CD), thiobarbituric acidreactive substance (TBARS), carbonylated proteins, reduced glutathione (GSH), glutathione peroxidase (GPx), superoxide dismutase (SOD) and catalase (CAT) activity were determined. The coefficient of oxidative stress was cal

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Петухова, Элина Азатовна, Валерия Сергеевна Ершова, Александр Владимирович Терентьев, et al. "Coulometric analysis method for determining the concentration and degree of oxidation of vanadium in the electrolyte of a vanadium flow battery using a hydrogen vanadium cell." Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 27, no. 1 (2024): 128–38. https://doi.org/10.17308/kcmf.2025.27/12490.

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Determining the vanadium content and the average degree of oxidation of vanadium ions in an electrolyte is a highly important task, both in the production and operation of vanadium flow batteries and in scientific research aimed at improving the performance characteristics of electrolytes throughout their entire life cycle. This article proposes a solution to this issue using the coulometric analysis of electrolyte samples circulating through a cell with a membrane-electrode unit consisting of a gas diffusion hydrogen electrode, a proton exchange membrane, and a liquid flow electrode. The coul

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Bychkov, V. Yu, Yu P. Tulenin, А. A. Gulin, and V. N. Korchak. "Variations of Cobalt Catalytic Activity and Selectivity in Ethylene Oxidation against Stepwise Oxidation of Cobalt Surface." Кинетика и катализ 64, no. 6 (2023): 785–97. http://dx.doi.org/10.31857/s0453881123060047.

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Catalytic activity of Co foil in ethylene oxidation was studied against oxidation degree of Co surface at stepwise foil oxidation. Experiments were conducted at temperatures of 500–800°C by a pulse method using alternative pulses of 0.2% C2H4–0.25% O2–1% Ar–He testing mixture and 1% O2–1% Ar–He oxidative mixture. Oxidation degree of Co foil varied from a totally reduced surface to an oxidation depth about a hundred of cobalt oxide “monolayers”. Using XRD, SEM and EDS, it was shown that CoO phase formed during a first stage of the stepwise oxidation (from 0 to ~60 oxide “monolayers”) at the all

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Carvalho, Alexandra, Mariana C. F. Costa, Valeria S. Marangoni, Pei Rou Ng, Thi Le Hang Nguyen, and Antonio H. Castro Neto. "The Degree of Oxidation of Graphene Oxide." Nanomaterials 11, no. 3 (2021): 560. http://dx.doi.org/10.3390/nano11030560.

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We show that the degree of oxidation of graphene oxide (GO) can be obtained by using a combination of state-of-the-art ab initio computational modeling and X-ray photoemission spectroscopy (XPS). We show that the shift of the XPS C1s peak relative to pristine graphene, ΔEC1s, can be described with high accuracy by ΔEC1s=A(cO−cl)2+E0, where c0 is the oxygen concentration, A=52.3 eV, cl=0.122, and E0=1.22 eV. Our results demonstrate a precise determination of the oxygen content of GO samples.

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Castro, Jorge Iván, Alana Payan-Valero, Carlos-Humberto Valencia-Llano, et al. "Graphene Oxide Nanosheets for Bone Tissue Regeneration." Molecules 29, no. 14 (2024): 3263. http://dx.doi.org/10.3390/molecules29143263.

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Bone tissue engineering is a promising alternative to repair wounds caused by cellular or physical accidents that humans face daily. In this sense, the search for new graphene oxide (GO) nanofillers related to their degree of oxidation is born as an alternative bioactive component in forming new scaffolds. In the present study, three different GOs were synthesized with varying degrees of oxidation and studied chemically and tissue-wise. The oxidation degree was determined through infrared (FTIR), X-ray diffraction (XRD), X-ray photoelectron (XPS), and Raman spectroscopy (RS). The morphology of

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Dissertations / Theses on the topic "Oxidation degree"

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Stothard, Nigel David. "The oxidation of trans-2-butene and propene between 400 and 520 degree C." Thesis, University of Hull, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333710.

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Brandén, Carl-Magnus. "Determination of the Degree of Oxidation in Dialdehyde Cellulose Using Near Infrared Spectroscopy." Thesis, Karlstads universitet, Avdelningen för kemiteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-55258.

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The purpose of this thesis work was to investigate possible in-, on- or at-line methods to determine the degree of oxidation in dialdehyde cellulose. Several technologies were reviewed which led to a feasibility study into a possible on-line or at-line method using near infrared spectroscopy for determining the degree of oxidation in wet dialdehyde cellulose. A calibration model was built using the near infrared spectra of 19 samples created from kraft pulp with a degree of oxidation between 0 and 52.1 %. The obtained model uses five significant principal components and has a goodness of fit (

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Kavanagh, Ian. "The influence of fish oil supplementation and degree of oxidation of LDL on atherogenic properties of macrophages." Thesis, University of Reading, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.405534.

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Ries, Daniel. "Studies on the antioxidant activity of milk proteins in model oil-in-water emulsions : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Food Technology, Riddet Institute, Massey University, Palmerston North, New Zealand." Massey University, 2009. http://hdl.handle.net/10179/1084.

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The present study was aimed at extending our knowledge of the antioxidative properties of the milk protein products, whey protein isolate (WPI) and sodium caseinate (NaCas), in oil-in-water (O/W) emulsions rich in polyunsaturated fatty acids (PUFAs). In particular, the objective was to contribute to our understanding of the compositional and processing factors that influence the oxidative stability of protein-stabilised O/W emulsions. Linoleic acid (approximately 60 %) was used as the lipid for the oil phase (10.6 %). The emulsion samples were usually incubated at 50 °C to accelerate lipid oxi

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Matak, Kristen. "Effects of UV Irradiation on the Reduction of Bacterial Pathogens and Chemical Indicators of Milk." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29852.

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Consumer demand for fresher and minimally processed foods has brought about a movement to find effective, non-thermal processing technologies for the treatment of milk. The influence of temperature on bacterial reduction in UV irradiated milk was tested. Commercially processed skim, reduced fat (2%), and whole milk samples were inoculated with a naladixic acid resistant E. coli O157:H7 surrogate (ATCC 25922), maintained at or brought to 4oC and 20oC, respectively, and then exposed to a UV light dose between 5.3-6.3 mJ/cm2 for approximately 1.5 sec using the CiderSure 3500 apparatus (FPE Inc.

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Ingham, Trevor. "The direct oxidation of trans-2-butene and iso-butene between 400 and 500 degrees centigrade." Thesis, University of Hull, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296221.

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Migriauli, Lela. "Effect of diet and physical activity on the markers of oxidative stress [thesis submitted in partial fulfilment of the degree of] Master of Applied Science, Auckland University of Technology, September 2004." Full thesis. Abstract, 2004.

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Burcher, Benjamin. "Novel low-oxidation state iron complexes : reactivity towards unsaturated substrates." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAF022.

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Dans cette thèse nous avons eu pour but d’étudier la réactivité des complexes à bas degré d’oxydation du fer stabilisés par des ligands phosphines vis-à-vis des substrats insaturés. Cet objectif s’inscrit dans une démarche plus large d’accès à des systèmes catalytiques au fer capables de transformer de manière sélective l’éthylène, par la réaction d’oligomérisation, vers des alpha-oléfines linéaires courtes (butène-1, héxène-1, octène-1), ce qui n’a jamais été rapporté dans la littérature. Pour se faire, le passage par le mécanisme métallacyclique de transformation de l’éthylène est la voie pr

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Díaz, Patricia I. "Studies on the oxidative stress response of porphyromonas gingivalis : a thesis submitted in fulfillment of the requirements for admission to the degree of Doctor of Philosophy /." Title page, summary and table of contents only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phd5426.pdf.

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Moon, Bok Hee. "A study of the activity and characteristics of superoxide dismutase in the male reproductive parts of Petunia : a thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Plant Biotechnology in the School of Biological Sciences, University of Canterbury /." Thesis, University of Canterbury. Biological Sciences, 2006. http://hdl.handle.net/10092/1326.

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In the stamen (male reproductive tissue) of petunia 'Hurrah' flowers, the occurrence of SOD (superoxide dismutase) provided an effective anti-oxidative mechanism against superoxide production. Superoxide production and SOD activities at five developmental stages showed a positive correlation. The highest superoxide production and SOD activity in different parts of the stamen (anther, filament and pollen) were at stages with high metabolic activity: (i) during growing buds (in anthers and filaments) (ii) when flowers with predehiscent anthers were fully open (in pollen). In all parts of the sta

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Books on the topic "Oxidation degree"

1

Sullivan, John Lawrence. The role of oxidation in the protection of sliding metal surfaces: Publications in support of a thesis submitted for the degree of Doctor of Philosophy, The University of Aston, September 1986. Aston University. Department of Electrical Engineering and Applied Physics, 1986.

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Bradley, L. B. The effects of preoxidation on the oxidation / sulphidation of Al2O3 forming alloys at 700 degrees centigrade. UMIST, 1993.

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Sunder, S. XPS, XRD and SEM study of oxidation of UO2 by air in gamma radiation at 150 [degrees] C. Whiteshell Laboratories, 1995.

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Dolara, Piero, ed. TOX: lezioni di tossicologia. Firenze University Press, 2006. http://dx.doi.org/10.36253/88-8453-412-7.

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TOX is a manual aimed primarily at the Toxicology courses of the Faculty of Pharmacy and Science, that can also be profitably utilised by students following different degree courses in other Faculties (Medicine, Agriculture, Engineering)and by anyone else looking for a thorough but succinct overview of toxicological questions. TOX covers the principal sectors of general toxicology (acute and chronic toxicity, mutagenesis, teratogenesis, carcinogenesis, reproductive toxicity, oxidative damage, epidemiological methods), specialist toxicology(dietary toxicity, tobacco smoke, pesticides, N-nitroso

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Kirchman, David L. Degradation of organic matter. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198789406.003.0007.

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The aerobic oxidation of organic material by microbes is the focus of this chapter. Microbes account for about 50% of primary production in the biosphere, but they probably account for more than 50% of organic material oxidization and respiration (oxygen use). The traditional role of microbes is to degrade organic material and to release plant nutrients such as phosphate and ammonium as well as carbon dioxide. Microbes are responsible for more than half of soil respiration, while size fractionation experiments show that bacteria are also responsible for about half of respiration in aquatic hab

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Goligorsky, Michael S., Julien Maizel, Radovan Vasko, May M. Rabadi, and Brian B. Ratliff. Pathophysiology of acute kidney injury. Edited by Norbert Lameire. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199592548.003.0221.

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In the intricate maze of proposed mechanisms, modifiers, modulators, and sensitizers for acute kidney injury (AKI) and diverse causes inducing it, this chapter focuses on several common and undisputable strands which do exist.Structurally, the loss of the brush border, desquamation of tubular epithelial cells, and obstruction of the tubular lumen are commonly observed, albeit to various degrees. These morphologic hallmarks of AKI are accompanied by functional defects, most consistently reflected in the decreased glomerular filtration rate and variable degree of reduction in renal blood flow, a

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Hughes, Jeremy. Proteinuria as a direct cause of progression. Edited by David J. Goldsmith. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199592548.003.0137.

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Proximal tubular cells reabsorb any filtered proteins during health via cell surface receptors such as megalin and cubulin so that very low levels of protein are present in the excreted urine. Significant proteinuria is a common finding in patients with many renal diseases. Proteinuria is a marker of glomerular damage and podocyte loss and injury in particular. The degree of proteinuria at presentation or during the course of the disease correlates with long-term outcome in many renal diseases. Proteinuria per se may be nephrotoxic and thus directly relevant to the progression of renal disease

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Jancura, Daniel, and Erik Sedlák. Bioenergetika. Univerzita Pavla Jozefa Šafárika, Vydavateľstvo ŠafárikPress, 2021. http://dx.doi.org/10.33542/be2021-0022-6.

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Prekladaný vysokoškolský učebný text „Bioenergetika“ by mal slúžiť ako úvod do problematiky štúdia v oblasti bioenergetiky. Táto vedná oblast je v súčasnosti vysoko aktuálna, pretože výsledky získané bioenergetickým výskumom v uplynulých rokoch zreteľne ukazujú, že bioenergetické procesy prebiehajúce v živých systémoch neslúžia “len” na transformáciu energie, ale ovplyvňujú aj priebeh procesov ako sú apoptóza, starnutie, vznik a rozvoj mnohých ochorení (predovšetkým neurodegeneratívnych). Tieto skutočnosti jednoznačne naznačujú potrebu existencie kvalitných učebných textov, ktoré by prijateľný

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Book chapters on the topic "Oxidation degree"

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Monnier, V. M., C. Gerhardinger, M. S. Marion, and S. Taneda. "Novel approaches toward inhibition of the Maillard reaction in vivo: Search, isolation and characterization of prokaryotic enzymes which degrade glycated substrates." In Oxidative Stress and Aging. Birkhäuser Basel, 1995. http://dx.doi.org/10.1007/978-3-0348-7337-6_15.

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Thomson, Neil R. "In Situ Chemical Oxidation of Petroleum Hydrocarbons." In Advances in the Characterisation and Remediation of Sites Contaminated with Petroleum Hydrocarbons. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-34447-3_15.

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AbstractIn situ chemical oxidation (ISCO) is a mature treatment technology that involves the delivery of a chemical oxidant into a target treatment zone (TTZ) to destroy petroleum hydrocarbon (PHC) compounds, and thereby reduce risk to human health and the environment. Commonly used chemical oxidants include hydrogen peroxide, sodium percarbonate, ozone, sodium or potassium permanganate, and sodium or potassium persulfate. All these oxidants can degrade environmentally relevant PHCs except that permanganate is non-reactive toward benzene. Ozone is delivered into the TTZ as a gas while the othe

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Sukanya Devi, R., Bhaarathi Dhurai, S. Sundaresan, and A. Selvakumar. "Advanced Oxidation Processes (AOP)—Effective Innovative Treatment Methods to Degrade Textile Dye Effluent." In Sustainable Textiles: Production, Processing, Manufacturing & Chemistry. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0065-4_7.

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Orsini, P. G., R. Dal Maschio, F. Marino, and P. Scardi. "Effect of Different Oxidation Degrees on the Structure and Properties of Stabilized Zirconia Plasma Spray Coatings." In Zirconia’88. Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1139-0_21.

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Zeng, Qingfeng, Laifei Cheng, Litong Zhang, Xingang Luan, Xiaowei Yin, and Yongdong Xu. "Modeling the Oxidation and Corrosion Behavior of 3D Carbon Fiber Reinforced SiC Matrix Composites from 400 to 1500 Degrees C." In Perspectives from Europe and Asia on Engineering Design and Manufacture. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2212-8_34.

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Mocanu, Larisa, Maria Gonta, and Vera Matveevici. "Homogeneous catalytic oxidation of medicinal drugs in aqueous model systems." In Redox Processes with Electron and Proton Transfer. Moldova State University, 2023. http://dx.doi.org/10.59295/prtep2023_21.

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The application of AOPs is an effective alternative for the reduction or elimination of emerging pollutants from residual effluents of pharmaceutical origin. According to European health regulations, pharmaceutical preparations must be completely absent from drinking water and water bodies. As a result, the reduction of emerging pollutants (PE) by applying Fenton and Fenton/UV oxidation was studied according to different physicochemical parameters in the presence of surfactants. The scientific results present the study of the kinetic legitimacy of the advanced oxidation processes of simple sys

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Gonta, Maria, Larisa Mocanu, and Vera Matveevici. "Heterogeneous photocatalytic oxidation with titanium dioxide of antibiotics and anti-inflammatories from aqueous solutions." In Redox Processes with Electron and Proton Transfer. Moldova State University, 2023. http://dx.doi.org/10.59295/prtep2023_20.

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In recent years, the problem of pollution of water sources with various pharmaceutical preparations and their metabolites has become topical around the world. Currently the solution to the problem of complete removal of residues of pharmaceutical substances and other substances from wastewater is associated with the use of advanced oxidative processes (AOPs). In the given work, kinetic models of heterogeneous photooxidation/mineralization of some antibiotics and anti-inflammatory drugs and the mixture of drugs (amoxocillin (AMX), cephalexin (CLX), diclofenac sodium (DCF)) were studied under UV

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Calvert, Jack G., Roger Atkinson, Karl H. Becker, et al. "Application Of Findings To Modeling The Atmospheric Chemistry Of Aromatic Hydrocarbons." In The Mechanisms Of Atmospheric Oxidation Of Aromatic Hydrocarbons. Oxford University PressNew York, NY, 2002. http://dx.doi.org/10.1093/oso/9780195146288.003.0010.

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Abstract The modeling of the atmospheric chemistry of aromatic hydrocarbons and the influence of these hydrocarbons on ozone generation within the urban atmosphere is an especially challenging task, since many of the details of the complex reactions that occur are unknown at present. One must resort to parameterized mechanisms, with the yields of surrogate model species representing reactive, uncharacterized products that are adjusted to fit the experimentally measured 03 , NO2, and N02, and possibly other measured products that are observed in smog chamber experiments. Some features of the a

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Martin Márquez López, Daniel, Tomás A. Fregoso-Aguilar, Jorge A. Mendoza-Pérez, and Sergio O. Flores-Valle. "Effect of the Ozonization Degree of Emu Oil over Healing: An Emerging Oxidation Treatment." In Antioxidants. IntechOpen, 2019. http://dx.doi.org/10.5772/intechopen.83383.

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Gonta, Maria Vasile, Veronica Porubin-Schimbator, and Larisa Mocanu. "Comparative Study of Kinetics of Catalytic Oxidation Process With Fenton's Reagent of Anionic (2-EHS) and Cationic (CTAB) Surfactants." In Handbook of Research on Water Sciences and Society. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-7998-7356-3.ch003.

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In this chapter, a comparative degradation/mineralization study of two surfactants—the anionic surfactant 2-ethyl-hexyl Sodium Sulfate (2-EHS) and the cationic surfactant Cetyltrimethyl Ammonium Bromide (CTAB)— was performed using a combination of AOPs: Fe(II)/H2O2. From experimental studies, it has been established that the optimal pH for the oxidation of surfactants (CTAB and 2-EHS) is the same, and is 2.5. And the optimal concentrations of Fenton reagent for the model system containing cationic surfactant [CTAB]=20 mg/L are [Fe2+]=1*10-3 M, [H2O2]=1*10-3 M and for the model system that cont

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Conference papers on the topic "Oxidation degree"

1

Hou, P. Y., Z. R. Shui, and J. Stringer. "The Oxidation Behavior of Co-15WT%Cr Alloy Containing Dispersed Oxides Formed by Internal Oxidation." In CORROSION 1992. NACE International, 1992. https://doi.org/10.5006/c1992-92137.

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Abstract Internal oxidation pretreatments of Co-15wt%Cr and Co-15wt%Cr-1wt%Ti were carried out using a Rhines pack in quartz, in mullite and in alumina. A dispersion of titanium oxide particles formed in the Ti-containing alloy as a result of the internal oxidation. However, silicon also diffused into all treated specimens when the pretreatments were carried out in quartz or in mullite. The effect of various pretreatments on the subsequent oxidation of these alloys was studied at 1000°C, and compared with that of a Co-15wt%Cr-1wt%Si alloy. The main purpose of this study was to determine the re

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Harper, M. A., J. E. Barnes, and G. Y. Lai. "Long-term Oxidation Behavior of Selected High Temperature Alloys." In CORROSION 1997. NACE International, 1997. https://doi.org/10.5006/c1997-97132.

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Abstract Long-term oxidation testing in still air for two years (720 days) at 1800°F (982° C) and one year (360 days) at 2000T (1093°C) and 2100°F (1149°C) has been conducted on several high temperature chromia-forming commercial alloys containing less than 2 wt% aluminum. Alloy samples were removed from the test furnace every thirty days and the weight change that occurred due to oxide scale spallation was recorded. The importance of long-term testing was demonstrated with some of the alloys experiencing breakaway oxidation after exhibiting low weight losses for thousands of hours. At the com

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de Miera, Mirnaly Saenz, Joseph Kish, Peter Poruks, Michael Györffy, Harvey Fraser, and Matthew Webb. "Oxidation Reactivity of Heat-Resistant Ni-Cr Alloys Exposed in Wet Air at 900 °C." In CORROSION 2021. AMPP, 2021. https://doi.org/10.5006/c2021-16288.

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Abstract The relative wet oxidation reactivity of two centrifugally-cast, heat-resistant Ni-Cr alloys is presented for an isothermal (900 °C) in wet (10% H2O) air up to 500 h. Both 48Ni-45Cr and 41Ni-32Cr exhibit a similar weight loss after 500 h, which suggests a similar relative reactivity. However, there are three aspects that suggest there is a difference in the relative wet oxidation reactivity. These include: (i) a different kinetic rate law (cubic for 41Ni-35Cr and parabolic for 48Ni-45Cr), (ii) a different susceptibility to internal oxidation (deeper in 48Ni-45Cr) and (iii) a differenc

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Tossey, Brett, and Bingtao Li. "Nitridation Resistance of Several Modern High-Temperature Nickel- and Cobalt-Based Alloys." In AM-EPRI 2024. ASM International, 2024. http://dx.doi.org/10.31399/asm.cp.am-epri-2024p1066.

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Abstract Nitridation is a high-temperature material degradation issue that can occur in air and in environments containing nitrogen, ammonia, etc., and in a variety of industrial processes. The nitridation behavior of several commercial nickel- and cobalt-based alloys is reviewed in this paper. The alloys include Haynes 230, Haynes 188, Haynes 625, Haynes 617, Haynes 214, Hastelloy X, and Haynes 233. The environments discussed are high-purity nitrogen gas between 871°C and 1250°C, 100% ammonia gas at 982°C and 1092°C, and a simulated combustion atmosphere at 982°C. The results showed that nitr

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Wang, D. Y., and K. Natesan. "Corrosion Evaluation of Weldments Exposed in TVA and Rocketdyne Atmospheric Fluidized Bed Combustors." In CORROSION 1990. NACE International, 1990. https://doi.org/10.5006/c1990-90284.

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Abstract A number of experimental iron-, nickel-, and cobalt-base weldment materials were exposed in TVA 20MW and Rocketdyne atmospheric fluidized bed Combustors (AFBCs) at 849°C for 1261 h and 871°C for 1000 h, respectively. Postexposure analyses were conducted at Argonne National Laboratory. All specimens experienced different degree of internal oxidation/sulfidation. Among eight filler materials, Marathon 25/35R and Haynes 188 showed the least corrosion attack, i.e., less than 0.5 mm/yr. The high nickel content in the weldment turned out to be unfavorable for corrosion resistance in the AFB

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Crolet, Jean-Louis, Sylvie Daumas, and Michel Magot. "pH Regulation by Sulfate-reducing Bacteria." In CORROSION 1993. NACE International, 1993. https://doi.org/10.5006/c1993-93303.

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Abstract Consideration of the exact degree of dissociation of all the weak acids involved in bacterial metabolisms shows that the SRB's regulate: the pH of their environment, at levels which depend on the potential secondary reactions: precipitation of FeS, oxidation of HS- to S2O3- - by traces of oxygen, metabolisation of this thiosulfate, or of other sulfur compounds. It is possible in this way to explain the initiation and growth of bacterial corrosion pits, the specificity of certain metabolisms, particularly mixotrophic ones, or the aggravating effect of oxygen ingress in H2S media.

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Baker, Brian A. "Nickel-Base Alloys to Address High Temperature Corrosion Issues in the Chemical Processing and Petrochemical Industries." In CORROSION 2006. NACE International, 2006. https://doi.org/10.5006/c2006-06229.

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Abstract Nickel-base alloys designed for elevated temperature service can offer a high degree of mechanical integrity and corrosion resistance for extended service. Proper selection of a material for a particular application involves consideration of several important factors. Corrosion resistance is a major deciding factor and many relevant corrosion modes must be considered, such as oxidation, carburization, nitridation, sulfidation, and attack by halide salts and gaseous halogen-containing species. Mechanical properties are an important consideration as well and would include elevated tempe

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Shifler, David A. "Alloy and Coatings Parameters That May Contribute to the Performance Behavior of High Temperature Materials." In CORROSION 2002. NACE International, 2002. https://doi.org/10.5006/c2002-02385.

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Abstract During a recent high-temperature work, it was discovered that a high-temperature coating on a single crystal casting had completely failed after 1000 hours of exposure in a hot corrosion environment. Though previous tests showed this coating was somewhat resistant to hot corrosion at 1650 °F (899 °C), our results revealed catastrophic corrosion penetration of both the coating and the alloy substrate. Differences in chemical compositions between a coating and a substrate alloy can lead to interdiffusion between these materials that can modify the oxidation and corrosion resistance of t

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Soriaga, Manuel P., G. M. Berry, C. Bhardwaj, et al. "Chemisorption of Organic Molecules on Metal Electrode Surfaces." In CORROSION 1990. NACE International, 1990. https://doi.org/10.5006/c1990-90300.

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Abstract The chemisorption of various organic functional groups from aqueous solutions onto smooth single-crystal and polycrystalline electrodes, and the resistance of the resulting monolayer intermediates towards electrochemical oxidation have been studied; these investigations were motivated by the need to understand, at the atomic level, metal passivation by monolayer organic coatings. The electrodes employed were Rh, Pd, Ir, Pt, and Au whose anodic dissolution is preceded by surface-oxide formation even in highly acidic media. Resistance towards anodic oxidation can thus be associated with

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Williams, Terry M., and Andrew H. Jacobson. "Environmental Fate of Isothiazolone Biocides." In CORROSION 1999. NACE International, 1999. https://doi.org/10.5006/c1999-99303.

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Abstract The environmental characteristics of industrial water treatment biocides are of great concern due to increasing regulatory pressure on water discharge and awareness of global ecology. A detailed knowledge of the environmental impact of a biocide is critical to its safe use and requires extensive testing. Isothiazolone biocides are broad spectrum antimicrobials which are used in a variety of industrial water treatment applications. In aquatic environments, these compounds rapidly biodegrade with half-lives significantly less than 24 hours. Metabolism involves cleavage of the isothiazol

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Reports on the topic "Oxidation degree"

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Haschke, J. M. Oxidation of delta-phase plutonium alloy: Corrosion kinetics in dry and humid air at 35 {degree}C. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/569098.

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Barker, Amanda, Taylor Sullivan, W. Baxter, et al. Iron oxidation–reduction processes in warming permafrost soils and surface waters expose a seasonally rusting Arctic watershed. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/48714.

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Landscape-scale changes from climate change in the Arctic affect the soil thermal regime and impact the depth to permafrost in vulnerable tundra watersheds. When top-down thaw of permafrost occurs, oxygen and porewaters infiltrate deeper in the soil column exposing fresh, previously frozen material and altering redox conditions. A gap remains in understanding how redox stratifications in thawing permafrost impact the geochemistry of watersheds in response to climate change and how investigations into redox may be scaled by coupling extensive geophysical mapping techniques. In this study, we co

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Stevens and Olsen. PR-179-12214-R01 CO Sensor Experimental Evaluation for Catalyst Health Monitoring. Pipeline Research Council International, Inc. (PRCI), 2014. http://dx.doi.org/10.55274/r0010827.

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Oxidation catalysts and three-way catalysts can be used to reduce the amount of CO present in engine exhaust. For 2-stroke lean-burn engines, the oxidation catalyst degrades over time be-cause of the buildup of poisons such as sulfur, zinc, phosphorous, and calcium. Three-way cata-lysts used with stoichiometric engines also degrade over time. Emissions analyzers are often used to evaluate the degradation of oxidation catalysts and three-way catalysts, but it can be very time consuming and expensive. Ideally, a simple sensor system would be beneficial for operating companies to determine if the

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Banin, Amos, Joseph Stucki, and Joel Kostka. Redox Processes in Soils Irrigated with Reclaimed Sewage Effluents: Field Cycles and Basic Mechanism. United States Department of Agriculture, 2004. http://dx.doi.org/10.32747/2004.7695870.bard.

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The overall objectives of the project were: (a) To measure and study in situ the effect of irrigation with reclaimed sewage effluents on redox processes and related chemical dynamics in soil profiles of agricultural fields. (b) To study under controlled conditions the kinetics and equilibrium states of selected processes that affect redox conditions in field soils or that are effected by them. Specifically, these include the effects on heavy metals sorption and desorption, and the effect on pesticide degradation. On the basis of the initial results from the field study, increased effort was de

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Olsen, Daniel, Bryan Hackleman, and Rodrigo Bauza Tellechaea. PR-179-16207-R01 Oxidation Catalyst Degradation on a 2-Stroke Lean-Burn NG Engine - Washing. Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011586.

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Oxidation catalysts are often utilized to reduce carbon monoxide, formaldehyde, and volatile organic compounds in order to meet emissions regulations for large bore natural gas engines. These catalysts degrade over time and need to be replaced or regenerated to maintain emissions compliance. This work evaluates the effectiveness of catalyst regeneration, or catalyst washing. The evaluation is performed by utilizing field and laboratory slip streams combined with catalyst module performance (reduction efficiency) measurements and catalyst material surface analysis to quantify catalyst poisons.

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Rafaeli, Ada, Wendell Roelofs, and Anat Zada Byers. Identification and gene regulation of the desaturase enzymes involved in sex-pheromone biosynthesis of pest moths infesting grain. United States Department of Agriculture, 2008. http://dx.doi.org/10.32747/2008.7613880.bard.

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The original objectives of the approved proposal included: 1. Establishment of the biosynthetic pathways for pheromone production using labeled precursors and GC-MS. 2. The elucidation of a circadian regulation of key enzymes in the biosynthetic pathway. 3. The identification, characterization and confirmation of functional expression of the delta-desaturases. 4. The identification of gene regulatory processes involved in the expression of the key enzymes in the biosynthetic pathway. Background to the topic: Moths constitute one of the major groups of pest insects in agriculture and their repr

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Natesan, K., and M. Uz. Oxidation kinetics and microstructure of V-(4-5) Wt.%Cr-(4-5) Wt.%Ti alloys exposed to air at 300-650{degrees}C. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/415830.

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Watkins, Chris B., Susan Lurie, Amnon Lers, and Patricia L. Conklin. Involvement of Antioxidant Enzymes and Genes in the Resistance Mechanism to Postharvest Superficial Scald Development. United States Department of Agriculture, 2004. http://dx.doi.org/10.32747/2004.7586539.bard.

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The objective of this research project was to evaluate the involvement of antioxidant enzymes and genes in the resistance mechanism to postharvest superficial scald development using two primary systems: 1. Resistant and susceptible progenies of an apple cross between a scald resistant crab apple, ‘White Angel’ and a scald susceptible cultivar, ‘Rome Beauty’; 2. Heat-treatment of ‘Granny Smith’, which is known to reduce scald development in this cultivar. In 2002 we asked for, and received (October 14), permission to revise our initial objectives. The US side decided to expand their results to

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Oxidation and chromium depletion of Alloy 800 and 316SS by molten NaNO/sub 3/-KNO/sub 3/ at temperatures above 600/degree/C. Office of Scientific and Technical Information (OSTI), 1987. http://dx.doi.org/10.2172/5103265.

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