Letteratura scientifica selezionata sul tema "Deactivation"

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Articoli di riviste sul tema "Deactivation"

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Persson, Jonas, Cindy Lustig, James K. Nelson, and Patricia A. Reuter-Lorenz. "Age Differences in Deactivation: A Link to Cognitive Control?" Journal of Cognitive Neuroscience 19, no. 6 (2007): 1021–32. http://dx.doi.org/10.1162/jocn.2007.19.6.1021.

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The network of regions shown by functional imaging studies to be deactivated by experimental tasks relative to nominally more passive baselines (task < baseline) may reflect processes engaged during the resting state or “default mode.” Deactivation may result when attention and resources are diverted from default-mode processes toward task processes. Aging is associated with altered patterns of deactivation which may be related to declining resources, difficulties with resource allocation, or both. These possibilities predict that greater task demand, which increases deactivation levels in
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Serdyukov, D. V., O. V. Kanunnikov, V. A. Akselrod, and N. G. Loyko. "Antimicrobial Properties of a Biocide Based on Quaternary Ammonium Compounds plus Polyhexamethylene Guanidine and Possible Methods of Its Deactivation." Biotekhnologiya 36, no. 6 (2020): 115–26. http://dx.doi.org/10.21519/0234-2758-2020-36-6-115-126.

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Biocidal agents (BA) are widely used in environmentally safe toilet complexes (ESTC) of passenger railcars to suppress microbial activity in fаecal sludge (FS). Subsequent disposal of BA-containing FS at municipal sewage treatment facilities adversely affects their work due to the loss of activated sludge. The antimicrobial properties of BA, based on quaternary ammonium compounds (QAC) and polyhexamethylene guanidine (PHMG), as well as methods for its neutralization, have been studied. It was confirmed that BA based on QAC and PHMG has an antimicrobial effect on various groups of bacteria, red
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Garner, Daniel, Matthew Blackburn, David J. Wright, and Archana Rao. "Improving guideline-mandated care of patients with implantable cardiac defibrillators." British Journal of Hospital Medicine 81, no. 8 (2020): 1–10. http://dx.doi.org/10.12968/hmed.2020.0259.

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Background/Aims Implantable cardiac defibrillators reduce the risk of sudden cardiac death in selected patients. The value of an implantable cardiac defibrillator declines as the patient's disease progresses. Guidelines suggest that the appropriateness of maintaining implantable cardiac defibrillator therapy be regularly reviewed as part of monitoring of the patient's disease trajectory. It is recommended that implantable cardiac defibrillators are deactivated as patients approach the end of life. Patients with a better understanding of their current state of health and the role that the impla
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Malhotra, Shveta, and Stephen G. Lomber. "Sound Localization During Homotopic and Heterotopic Bilateral Cooling Deactivation of Primary and Nonprimary Auditory Cortical Areas in the Cat." Journal of Neurophysiology 97, no. 1 (2007): 26–43. http://dx.doi.org/10.1152/jn.00720.2006.

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Although the contributions of primary auditory cortex (AI) to sound localization have been extensively studied in a large number of mammals, little is known of the contributions of nonprimary auditory cortex to sound localization. Therefore the purpose of this study was to examine the contributions of both primary and all the recognized regions of acoustically responsive nonprimary auditory cortex to sound localization during both bilateral and unilateral reversible deactivation. The cats learned to make an orienting response (head movement and approach) to a 100-ms broad-band noise stimulus e
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Jaklová, Karolína Dlasková, Lucie Šindelářová, Jan Kohout, Ivana Hradecká, Nikita Sharkov, and Aleš Vráblík. "Comparison of the Accelerated and Spontaneous Deactivation of the HDS Catalyst." Processes 9, no. 12 (2021): 2258. http://dx.doi.org/10.3390/pr9122258.

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Owing to the increased use of secondary materials for diesel production, refineries must confront bad quality parameters. Therefore, catalysts with certain capabilities (to remove heteroatoms and improve quality parameters at low hydrogen consumption) and their lifetimes are required. An important parameter that influences the quality of the products and the economy of the unit is the activity of the catalyst. Prior to industrial use, the catalyst is typically tested in a pilot unit. This is necessary to obtain a considerable amount of data on the lifetime of the catalyst in the shortest feasi
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Madre, M., E. Pomarol-Clotet, P. McKenna, et al. "Brain functional abnormality in schizo-affective disorder: an fMRI study." Psychological Medicine 43, no. 1 (2012): 143–53. http://dx.doi.org/10.1017/s0033291712000943.

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BackgroundSchizo-affective disorder has not been studied to any significant extent using functional imaging. The aim of this study was to examine patterns of brain activation and deactivation in patients meeting strict diagnostic criteria for the disorder.MethodThirty-two patients meeting Research Diagnostic Criteria (RDC) for schizo-affective disorder (16 schizomanic and 16 schizodepressive) and 32 matched healthy controls underwent functional magnetic resonance imaging (fMRI) during performance of the n-back task. Linear models were used to obtain maps of activations and deactivations in the
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Barker, Virgil M. "Deactivation of Pacemakers at the End of Life." Ethics & Medics 44, no. 9 (2019): 1–2. http://dx.doi.org/10.5840/em201944912.

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The liceity of deactivating pacemakers and implantable cardio-defibrillators at the end of life has been considered only recently. The current discussion divides into two main camps: those who view deactivation as the moral equivalent of the withdrawal of other life-sustaining interventions, and those who hold deactivation as the equivalent of physician-assisted suicide. Some authors contend that similar to a transplanted organ, the pacemaker establishes an organic unity with the human body. Hence, its deactivation is equivalent to the removal or disabling of an organ. On the contrary, the rel
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Grasso, Marco, and Daniel Delatin Rodrigues. "Sustainability Transitions Through Fossil Infrastructure Deactivation." Sustainability 17, no. 14 (2025): 6465. https://doi.org/10.3390/su17146465.

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This article reframes sustainability transitions by positioning the deliberate deactivation of fossil fuel infrastructures—such as coal plants, oil fields, and pipelines—as a central mechanism of systemic change. While prevailing approaches often emphasize renewable energy and innovation, they tend to neglect how existing fossil systems are actively maintained by powerful networks. We argue that sustainability transitions require not only building alternatives but also deactivating entrenched fossil infrastructures. To address this gap, we propose an analytical framework that conceptualizes de
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Wöhrl, Katharina, Yash Kotak, Christian Geisbauer, et al. "Analysis of Deactivation of 18,650 Lithium-Ion Cells in CaCl2, Tap Water and Demineralized Water for Different Insertion Times." Sensors 23, no. 8 (2023): 3901. http://dx.doi.org/10.3390/s23083901.

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The deployment of battery-powered electric vehicles in the market has created a naturally increasing need for the safe deactivation and recycling of batteries. Various deactivating methods for lithium-ion cells include electrical discharging or deactivation with liquids. Such methods are also useful for cases where the cell tabs are not accessible. In the literature analyses, different deactivation media are used, but none include the use of calcium chloride (CaCl2) salt. As compared to other media, the major advantage of this salt is that it can capture the highly reactive and hazardous molec
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Broering, J. M., and A. S. Bommarius. "Cation and strong co-solute effects on protein kinetic stability." Biochemical Society Transactions 35, no. 6 (2007): 1602–5. http://dx.doi.org/10.1042/bst0351602.

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Degradation of proteins is important for the operating life of biocatalysts and the shelf life of protein pharmaceuticals. We have previously found that the deactivating effects of salts on proteins can be correlated to an indicator of ion hydration, the B-viscosity coefficient of the anion in solution. Here, we test the influence of cations on protein kinetic stability by observing deactivation of mRFP (monomeric red fluorescent protein) in ammonium, caesium and chloride salt solutions, and we find that mRFP deactivation does not depend on cation hydration. We also measure mRFP deactivation i
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Tesi sul tema "Deactivation"

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Azzu, Vian. "Deactivation of mitochondrial uncoupling proteins." Thesis, University of Cambridge, 2009. https://www.repository.cam.ac.uk/handle/1810/252159.

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Devadas, P. "Catalyst deactivation in propane aromatization." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1997. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3145.

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O'Toole, Ann Marie. "Thermal deactivation of Pseudomonas aeruginosa biofilms." Thesis, University of Iowa, 2015. https://ir.uiowa.edu/etd/1715.

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Bacterial biofilm infection is a common (~ 2 to 4%) complication for recipients of surgically implanted medical devices. Due to the tremendous increase in antibiotic resistance when these bacteria enter the biofilm phenotype, present treatment requires explantation and replacement of the device, often with multiple surgeries and always with much longer patient recovery time. The specific objective of this study was to quantify the degree of biofilm deactivation from exposure to thermal shock for varying temperature and time durations. While extreme temperature (>150˚C) is routinely used to ste
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Arteaga, Colina Geomar Daniel. "Deactivation of Pt/(gamma)-A12O3 during hydrocarbon reactions : mechanism of initial deactivation stages and carbonaceous residue characterisation." Thesis, University of Aberdeen, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521157.

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Deactivation of a 0.53 wt% Pt/γ-Al<sub>2­</sub>O<sub>3</sub> catalyst due to strongly adsorbed carbonaceous residue was investigated.  The role of the carbonaceous residue formed during hydrocarbon conversion reactions of 1-octene, toluene and 1:1 volume mixture of 1-octene/toluene at 300, 400 and 450°C was established and a model developed to account for the activity and selectivity changes at the very start of the reaction, just as the hydrocarbon residue begins to form on the surface of the catalyst.  CO pulse chemisorption was used to determine the extent of Pt surface blocked by the hydro
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Steiner, Petr. "Kinetic and Deactivation Studies of Hydrodesulfurization Catalysts." Doctoral thesis, Norwegian University of Science and Technology, Department of Chemical Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-94.

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<p>Hydrodesulfurization is an important part of the hydrotreating process. More stringent regulations on the quality of fuels bring new requirements to the catalytic processes. The removal of sulfur has become a key issue in the oil refining and this work aims to address several aspects of the process.</p><p>Kinetic studies of the hydrodesulfurization reaction over conventional (molybdenum-based) and new (Pt/Y-zeolite) catalysts are reported. The hydrodesulfurization of both the real oil (light gas oil from Statoil Mongstad refinery) and model compounds (thiophene and dibenzothiophene) over a
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Rashchi, Fereshteh. "Deactivation of Pb-contaminated sphalerite by polyphosphate." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36828.

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Activation of sphalerite by lead ions in the presence of ethyl xanthate was investigated by microflotation, zeta potential measurements, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and extraction by ethylenediaminetetraacetate (EDTA). The source of lead, either from solution or contact with galena particles, proved immaterial. From EDTA extraction data flotation response was determined as a function of surface concentration of Pb ([Pb]surf, mg/cm2). A critical [Pb]surf &sime; 0.5 x 10-4 mg/cm2 causing activation was estimated. By combining with a Pb ion productio
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McQueen, Paul. "Catalysis deactivation in staged direct coal liquefaction." Thesis, Heriot-Watt University, 1996. http://hdl.handle.net/10399/746.

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Mandani, Faisal Mohammad. "Kinetic and deactivation studies during catalytic dehydrogenation." Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305913.

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Paweewan, Boontham. "Coking and deactivation of zeolite-based catalysts." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624350.

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Hu, Ing-Feng. "Activation and deactivation of glassy carbon electrodes /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu148726339902366.

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Libri sul tema "Deactivation"

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1924-, Petersen Eugene E., Bell Alexis T. 1942-, and International Symposium on Catalysis Deactivation and Poisoning (3rd : 1985 : Lawrence Berkeley Laboratory), eds. Catalyst deactivation. M. Dekker, 1987.

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Illinois State Board of Education (1973- ). Deactivation at a glance. Illinois State Board of Education, 2005.

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Kumbilieva, Krassimira. Kinetic Aspects of Catalyst Deactivation. Prof. Marin Drinov Academic Publishing House, 2012.

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Jacques, Oudar, and Wise Henry 1919-, eds. Deactivation and poisoning of catalysts. M. Dekker, 1985.

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Butt, John B. Activation, deactivation, and poisoningof catalysts. Academic Press, 1988.

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Sadana, Ajit. Biocatalysis: Fundamentals of enzyme deactivation kinetics. Prentice Hall, 1991.

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Butt, John B. Activation, deactivation, and poisoning of catalysts. Academic Press, 1988.

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Matyjaszewski, Krzysztof, Haifeng Gao, Brent S. Sumerlin, and Nicolay V. Tsarevsky, eds. Reversible Deactivation Radical Polymerization: Materials and Applications. American Chemical Society, 2018. http://dx.doi.org/10.1021/bk-2018-1285.

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O'Connor, Paul, Toru Takatsuka, and Geoffrey L. Woolery, eds. Deactivation and Testing of Hydrocarbon-Processing Catalysts. American Chemical Society, 1996. http://dx.doi.org/10.1021/bk-1996-0634.

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Rashchi, Fereshteh. Deactivation of Pb-contaminated sphalerite by polyphosphate. McGill University, 2000.

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Capitoli di libri sul tema "Deactivation"

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Weik, Martin H. "deactivation." In Computer Science and Communications Dictionary. Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_4457.

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Richardson, James T. "Catalyst Deactivation." In Principles of Catalyst Development. Springer US, 1989. http://dx.doi.org/10.1007/978-1-4899-3725-4_8.

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Figueiredo, J. L., and F. Ramôa Ribeiro. "Catalyst Deactivation." In Combinatorial Catalysis and High Throughput Catalyst Design and Testing. Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4329-5_5.

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Boskovic, Goran, and Manfred Baerns. "Catalyst Deactivation." In Basic Principles in Applied Catalysis. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05981-4_14.

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Schmal, Martin, and José Carlos Pinto. "Catalyst deactivation." In Chemical Reaction Engineering, 2nd ed. CRC Press, 2021. http://dx.doi.org/10.1201/9781003046608-19.

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Guisnet, M., and P. Magnoux. "Deactivation of Zeolites by Coking. Prevention of Deactivation and Regeneration." In Zeolite Microporous Solids: Synthesis, Structure, and Reactivity. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2604-5_20.

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Ganczarski, Artur, Halina Egner, and Marcin Cegielski. "Deactivation of Damage Effects." In Encyclopedia of Continuum Mechanics. Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-53605-6_256-1.

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Dell, P., M. Bonvallet, and A. Hugelin. "Mechanisms of Reticular Deactivation." In Ciba Foundation Symposium - The Nature of Sleep. John Wiley & Sons, Ltd., 2008. http://dx.doi.org/10.1002/9780470719220.ch5.

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Nielsen, P. E. Højlund. "Deactivation of Synthesis Catalyst." In Catalytic Ammonia Synthesis. Springer US, 1991. http://dx.doi.org/10.1007/978-1-4757-9592-9_8.

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Janssens, J. P., A. D. van Langeveld, S. T. Sie, and J. A. Moulijn. "Catalyst Deactivation in Hydrodemetallization." In ACS Symposium Series. American Chemical Society, 1996. http://dx.doi.org/10.1021/bk-1996-0634.ch018.

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Atti di convegni sul tema "Deactivation"

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Williams, Terry M., and Heather R. McGinley. "Deactivation of Industrial Water Treatment Biocides." In CORROSION 2010. NACE International, 2010. https://doi.org/10.5006/c2010-10049.

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Abstract Industrial biocides are used for microbial control in a variety of industrial water systems including, cooling, paper, oilfield, and membrane applications. Biocide treatment programs are typically designed to provide optimal results based on environmental conditions, regulatory needs, efficacy, and cost. An important area of concern relating to biocide use is discharge of the treated effluent (ex., blowdown) into waste treatment systems or natural waters. Regulatory requirements also impact the amount of biocide that may be released. In many cases, the biocide must be effectively deac
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Pappagallo, M. Andrea, Tilman J. Schildhauer, Oliver Kr�cher, and Emanuele Moioli. "A New Method to Assess Performance Loss due to Catalyst Deactivation in Fixed- and Fluidized-bed Reactors." In The 35th European Symposium on Computer Aided Process Engineering. PSE Press, 2025. https://doi.org/10.69997/sct.136705.

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A new methodology for the assessment of the performance loss in catalytic reactors due to deactivation was developed and applied to fixed- and fluidized-bed CO methanation, with catalyst subject to coking. The methodology is based on the solution of heat and mass balances, by decoupling the reactor and deactivation dynamics. This is possible by using consecutive 1D, steady-state calculations for the characterization of the reactor performance. In this way, the progressively lower values of catalyst activity along the time on stream are computed with the integration of a dedicated dynamic model
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Strange, Dakota B., and Pingen Chen. "A Cylinder Deactivation Control Framework for Gasoline Engines without Valve Deactivation." In 2020 American Control Conference (ACC). IEEE, 2020. http://dx.doi.org/10.23919/acc45564.2020.9147316.

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YANAGIDA, Shoji. "Development of Cylinder Deactivation Control during Idle for Conventional Engines." In 2024 Small Powertrains and Energy Systems Technology Conference. SAE International, 2025. https://doi.org/10.4271/2024-32-0019.

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&lt;div class="section abstract"&gt;&lt;div class="htmlview paragraph"&gt;This report examines the advancement and utilization of cylinder deactivation technology that enhances fuel efficiency in conventional engines without hardware modifications. It operates by halting fuel supply to some of the cylinders in multi-cylinder engines and increasing the output power of the remaining active cylinders to maintain an idle state. By implementing this technology in the mass-produced 90° V-twin engine, the U502, and deactivating one of its two cylinders, fuel consumption during idling is reduced by ov
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Vinodh, B. "Technology for Cylinder Deactivation." In SAE 2005 World Congress & Exhibition. SAE International, 2005. http://dx.doi.org/10.4271/2005-01-0077.

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NAGASAWA, YUTAKA, SATORU NAKASHIMA, CHIHIRO EGAMI, et al. "COHERENT DEACTIVATION PROCESS OF PSEUDOAZURIN." In With Foreword by Prof A H Zewail, Nobel Laureate in Chemistry, 1999. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812777980_0080.

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Arnström, Daniel, and André M. H. Teixeira. "Stealthy Deactivation of Safety Filters." In 2024 European Control Conference (ECC). IEEE, 2024. http://dx.doi.org/10.23919/ecc64448.2024.10590978.

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Xu, Zhiwen, Yuxin Li, Yungang Wang, Hao Wang, and Qinxin Zhao. "Deactivation Characteristics of SCR Catalyst at Different Stages in Coal-Fired Flue Gas." In ASME 2018 12th International Conference on Energy Sustainability collocated with the ASME 2018 Power Conference and the ASME 2018 Nuclear Forum. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/es2018-7352.

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Through analyzing the impact of the factors of catalyst deactivation, different factors are classified according to timeliness characteristics. In this research, experiments were made under the condition of coal combustion flue gas on a coal-fired boiler to study the characteristics of the early deactivation of the SCR catalyst. Analysis shows that the main cause of early deactivation of catalyst is chemical poisoning (mainly alkali metal) and pores clogging on the surface of the catalyst. While the main cause of long-term deactivation is deeper chemical poisoning, pores clogging and the chemi
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Dou, Danan, and Owen H. Bailey. "Investigation of NOx Adsorber Catalyst Deactivation." In International Fall Fuels and Lubricants Meeting and Exposition. SAE International, 1998. http://dx.doi.org/10.4271/982594.

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Uy, Dairene, and Ann E. O'Neill. "Raman Studies of Automotive Catalyst Deactivation." In SAE 2006 World Congress & Exhibition. SAE International, 2006. http://dx.doi.org/10.4271/2006-01-0409.

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Rapporti di organizzazioni sul tema "Deactivation"

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Szilagyi, Andrew. Deactivation implementation guide. Office of Scientific and Technical Information (OSTI), 1999. http://dx.doi.org/10.2172/1491067.

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Yook, H. R., J. R. Barnett, and T. L. Collins. Deactivation of Building 7602. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/204212.

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Smalley, Vinyard, and Evans. L51511 Deactivating Power Cylinders under Reduced Load on Two-Cycle Engines. Pipeline Research Council International, Inc. (PRCI), 1986. http://dx.doi.org/10.55274/r0010517.

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Investigates potential and procedures for selective deactivation of one or more power cylinders in two-cycle engines under reduced load to effect fuel savings while avoiding possible engine derangement. The objectives were to identify any major problems with cylinder deactivation, to quantify likely benefits, to determine potential increases in load or stress, and to generate guidelines from the project results. This study showed that economic benefits are possible with the careful use of cylinder deactivation; however, several operational problems were encountered, such as spark plug fouling,
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Bogen, D. M. PFP deactivation project management plan. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/312807.

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Stefanski, L. D. UO3 deactivation end point criteria. Office of Scientific and Technical Information (OSTI), 1994. http://dx.doi.org/10.2172/10186476.

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Lund, D. P., and 309 Building Working Group. 309 Building deactivation function analysis report. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/447988.

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Stordeur, R. T. ,. Westinghouse Hanford. 340 Waste handling facility deactivation plan. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/325070.

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Peterson, David Shane, and Frank Laverne Webber. Deactivation, Decontamination and Decommissioning Project Summaries. Office of Scientific and Technical Information (OSTI), 2001. http://dx.doi.org/10.2172/910753.

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Lund, D. P., and 308 Building Working Group. 308 Building deactivation function analysis report. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/450042.

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Lund, D. P., and PUREX Working Group. PUREX Plant deactivation function analysis report. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/450051.

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