Thematische Bibliographien / Cleaning ratio

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Zeitschriftenartikel
Dissertationen
Bücher
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Konferenzberichte
Berichte der Organisationen

Auswahl der wissenschaftlichen Literatur zum Thema „Cleaning ratio“

Autor: Grafiati

Veröffentlicht am 7. Juni 2025

Zuletzt aktualisiert am 2. August 2025

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Zeitschriftenartikel zum Thema "Cleaning ratio"

Yu, Pi Chun, Cheng Kuen Chen, Jin Lang Lin, Chih Ning Wu, and Hiroshi Matsuo. "High Aspect Ratio Contact Clean Study in 58nm Flash Device." Solid State Phenomena 145-146 (January 2009): 35–38. http://dx.doi.org/10.4028/www.scientific.net/ssp.145-146.35.

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In the conventional wet cleaning process of contact holes landing on the Si substrate and WSi metal gate, the ILD BPTEOS bowing and CD enlargement were often found by using dilute HF solution. With the device design rule decreasing, the CD size control and cleaning efficiency enhancement are highly demanded. In this work, the high aspect-ratio contact (AR~10) cleaning in single wafer (SW) tool was demonstrated in 58nm flash device. With the facilitation of nano-spray function to enhance particle removal efficiency (PRE), AM1 cleaning in SW tool can achieve the low contact resistance and tighte

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Zhang, Ning, Jun Fu, Zhi Chen, Xuegeng Chen, and Luquan Ren. "Optimization of the Process Parameters of an Air-Screen Cleaning System for Frozen Corn Based on the Response Surface Method." Agriculture 11, no. 8 (2021): 794. http://dx.doi.org/10.3390/agriculture11080794.

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The threshing of frozen corn is accompanied by breakage and adherence, which influence the cleaning performance when the corn-cleaning mixture is separated and cleaned. In order to reduce the impurity ratio and loss ratio during frozen corn cleaning and provide theoretical support for frozen corn combine harvesting, this study employed a self-made air-screen cleaning system with adjustable parameters. The optimal process parameters of frozen corn cleaning were determined by using the response surface method (RSM). The influences of the fan speed (FS), vibrational frequency (VF), and screen ope

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Han, Yan Fang, Ti Chang Sun, Jie Li, Li Na Wang, Tian Yan Xue, and Tao Qi. "Removing of Si in the NaOH Molten Salt Reaction of Titanium Slag to Produce TiO₂." Advanced Materials Research 418-420 (December 2011): 387–92. http://dx.doi.org/10.4028/www.scientific.net/amr.418-420.387.

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NaOH solution was utilized in the molten salt reaction of titanium slag for investigating desiliconization effects. The thermodynamic behaviors of Si in the reaction system was examined to explore the impacts of molten salt reaction conditions on the conversion rates of the foreign substance Si and the target element Ti. On this basis, the influences of NaOH concentration, liquid-solid ratio, cleaning temperature and cleaning time on Si removing rate were discussed. The experimental results showed that, Si reacted with NaOH to produce sodium silicate was feasible in terms of thermodynamics wit

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Garnier, Philippe, and Hervé Fontaine. "Metal Removal Efficiency in High Aspect Ratio Structures." Solid State Phenomena 255 (September 2016): 313–18. http://dx.doi.org/10.4028/www.scientific.net/ssp.255.313.

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An extremely low level of metal contamination is required for specific devices like memories and CMOS Image sensors. Most of past work in the literature has focused on blanket wafer decontamination, since metrology is mostly adapted to flat surfaces. Metal removal efficiency has been compared between blanket wafers versus high aspect ratio deep trenches wafers. Two different metrology technics enable a quantitative and spatial metal removal determination on patterned wafers. Efficient cleaning in high aspect ratio structures requires much longer cleaning recipes than on flat surfaces.

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Boulais, Denis. "Sex Offspring Ratio and Radiofrequency Radiation Exposure." Journal of System Safety 53, no. 1 (2017): 35–38. http://dx.doi.org/10.56094/jss.v53i1.100.

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Radiofrequency (RF) radiation is a silent and invisible hazard for both high-access window cleaners and telecommunications riggers that can heat body tissue, resulting in injury. In this study, a total of 68 high-access window cleaners were interviewed to establish their sex offspring ratio. Results indicated that there was no significant variance to that of the general Australian population. The high-access window cleaning industry has a lower awareness of this hazard than the telecommunications industry. This study compares and contrasts its outcomes against a similar study within the

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Kim, Myeongjun, Philgong Choi, Jae Heung Jo, and Kyunghan Kim. "Glass Substrate Dust Removal Using 233 fs Laser-Generated Shockwave." Micromachines 12, no. 11 (2021): 1382. http://dx.doi.org/10.3390/mi12111382.

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Eliminating dust is gaining importance as a critical requirement in the display panel manufacturing process. The pixel resolution of display panels is increasing rapidly, which means that even small dust particles on the order of a few micrometers can affect them. Conventional surface cleaning methods such as ultrasonic cleaning (USC), CO2 cleaning, and wet cleaning may not be sufficiently efficient, economical, or environment friendly. In this study, a laser shockwave cleaning (LSC) method with a 233 fs pulsed laser was developed, which is different from the laser ablation cleaning method. To

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Noh, Kwang-Chul, and Myung-Do Oh. "Variation of clean air delivery rate and effective air cleaning ratio of room air cleaning devices." Building and Environment 84 (January 2015): 44–49. http://dx.doi.org/10.1016/j.buildenv.2014.10.031.

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Ding, Bochuan, Zhenwei Liang, Yongqi Qi, Zhikang Ye, and Jiahao Zhou. "Improving Cleaning Performance of Rice Combine Harvesters by DEM–CFD Coupling Technology." Agriculture 12, no. 9 (2022): 1457. http://dx.doi.org/10.3390/agriculture12091457.

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The cleaning device is an important part of combine harvesters, as its superior or inferior performance directly affects the performance of the combine harvester greatly. With an increasing rice yield, the current single-duct cleaning performance declines greatly, and causes a large grain sieve loss level and a direct grain loss for the farms. To optimize the existing single-duct cleaning device to meet the large feeding rate requirement, firstly, the terminal velocity of rice grain and MOG (material other than grain) for different varieties was experimentally measured by the custom-made devic

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WANG, Bowen, Longxi ZHENG, Yue CHENG, Chao WANG, Qing LI, and Jie LU. "Study on the influence of outlet diameter on the out-field pressure action characteristics of pulse detonation cleaning device." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 42, no. 3 (2024): 477–86. http://dx.doi.org/10.1051/jnwpu/20244230477.

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Pulse detonation cleaning technology is an efficient cleaning technology that is used inert shock waves generated by decoupling the detonation to remove ash and deposits. And it has great advantages in the field of furnace cleaning. In order to investigate the pressure distribution characteristics outside the detonation cleaning device and to explore the effect of the device outlet diameter on the pressure distribution characteristics, numerical simulations and experimental studies of pulse detonation cleaning device with using propane-air as the fuel has been carried out. The numerical simula

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Wiilknitz, P. "Cleaning Power and Abrasivity of European Toothpastes." Advances in Dental Research 11, no. 4 (1997): 576–79. http://dx.doi.org/10.1177/08959374970110042701.

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For 41 toothpastes available to European consumers in 1995, the cleaning efficacy was evaluated in comparison with abrasivity on dentin (RDA value). For cleaning power assessment, a modified pellicle cleaning ratio (PCR) measurement method was developed. The method is characterized by a five-day tea-staining procedure on bovine front teeth slabs on a rotating wheel, standardized brushing of the slabs in a V8 cross-brushing machine, and brightness measurement by a chromametric technique. All tested products were in accordance with the new DIN/ISO standard 11609 for toothpastes in terms of denti

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Dissertationen zum Thema "Cleaning ratio"

Walker, Matthew James. "Impact of Stringently Controlled Vacuum Environments with in situ Surface Cleaning on Contact Resistance of Au and Ru Based Radio Frequency Microelectromechanical Switches." NCSU, 2009. http://www.lib.ncsu.edu/theses/available/etd-06192009-085112/.

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Radio frequency microelectromechanical system (RF MEMS) switches have many promising advantages over solid state switches, particularly with respect to signal stability, cutoff frequency, insertion loss and power consumption characteristics. While gold has traditionally been employed for RF MEMS contacts on account of its chemical inertness and low resistivity, its softness has proven problematic in terms of reliability for commercial applications. The use of materials other than gold appears to be necessary, and a better understanding of the mechanisms causing premature failure has become inc

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CHIU, KUAN-WEI, and 邱冠維. "The Study of Performance on Reduction Cleaning with Different Liquor Ratio after Polyester Knitted Fabric Dyeing Manufacturing Process." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/d9aazf.

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碩士<br>中國文化大學<br>紡織產業碩士專班<br>107<br>After the polyester dye has been dyed by the disperse dye, usually some dye does not enter the crystallization zone of the polyester fiber, and the residual color on the surface of the fabric causes floating phenomenon. Therefore, it is necessary to carry out reduction washing to reduce the dye on the surface of the fabric. Some will need to carry out the second reduction washing due to the type of dye, the concentration of the formula or the unsuitable reduction washing conditions, etc., the color fastness can reach the standard, but the program is time-cons

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Strain, Jana. "Experimental comparison of heat pipes and thermosyphons containing methanol and acteone." Thesis, 2017. http://hdl.handle.net/1828/7993.

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The cold chain industry has a need for a standalone, electricity independent cooling unit that is used for both storage of warehouse product and on deliveries [1]. Mixed temperature fresh and frozen food deliveries are problematic without the distributor having specialized duel compartment refrigerated trucks [2]. These trucks permanently reduce the available capacity for payload delivery [2]. It would be valuable to the cold chain industry to have a passive, independent, storage unit that can be moved using a forklift and placed anywhere within a reefer or warehouse [1]. This versatile unit i

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Bücher zum Thema "Cleaning ratio"

McCartney, Annie. Two doors down: Your cheatin' heart. Sphere, 2008.

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Slater, Leigh Ann, and Pamela A. Lipsett. Environmental decontamination and isolation strategies in the ICU. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0285.

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Potential avenues for infection transmission range from the initial hospital construction itself to unit and room layout, design materials, disinfection materials and methods, isolation equipment, and staff ratios and training. Better understanding of these avenues for transmission will suggest the means to decrease the burden of environmental contamination. There is a limited evidence base for many currently employed cleaning and isolation techniques. Many are simply intuitive or based on non-controlled observations, and rigorous studies may be prohibitively expensive. In addition, reduced co

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Eleven. Simon & Schuster, 2010.

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Eleven: A novel. Scribner, 2011.

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Max's special spring. Grosset & Dunlap, an imprint of Penguin Group (USA) LLC, 2015.

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Buchteile zum Thema "Cleaning ratio"

Kröger, Teppo. "Rates of Care Poverty." In Care Poverty. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97243-1_4.

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AbstractThis chapter makes an inventory of earlier research on the prevalence of unmet care needs and summarises these findings under the term of care poverty rates. Care poverty rate is defined as the ratio of people, in a given group of people with care needs, whose care needs are not met. In the chapter care poverty rates are reported separately for different care poverty domains and measurement approaches. Findings are compared between different countries but also between the three care poverty domains and the two measurement approaches. Some countries (like Spain) show consistent results,

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Ziekow, Holger, Lenka Ivantysynova, and Oliver Günter. "RFID Data Cleaning for Shop Floor Applications." In Unique Radio Innovation for the 21st Century. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-03462-6_7.

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AlAzzam, Bayan A., Manar Alkhatib, and Khaled Shaalan. "Towards Gulf Emirati Dialect Corpus from Social Media." In BUiD Doctoral Research Conference 2023. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-56121-4_27.

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AbstractPurpose: This paper discusses the need for a corpus of Emirati traditional phrases and idioms in natural language processing (NLP) for the Gulf Emirati dialect and its potential applications in fields like voice recognition, machine translation, and sentiment analysis.Methodology: The researchers collected a corpus of more than 3000 traditional Emirati words and idioms by gathering data from several social media platforms, such as forums, YouTube, and Emirati radio stations. In addition, the researchers used the website scraping technologies to collect suitable resources, subsequently

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Cruz Ortiz, G. A., and Pavel Vorobiev. "OPTIMAL CLEANING FREQUENCY MODELLING FOR SOLAR FARMS BASED ON SOILING FORECASTING." In Intelligent Transportation Systems. FSBEO HPE Moscow State University of Railway Engineering (MIIT), 2025. https://doi.org/10.30932/9785002587582-2025-238-243.

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Soiling affects solar farms in a smaller or greater impact all over the world. In this study we proposed a model for optimal cleaning frequency based on the climatic variables with higher weight in the decision of cleaning frequency, the soiling ratio and the average annual millimeters of rain. Average rain is a simplified way to estimate the natural cleaning by rainy periods and, in fact, reduce the cost of a cleaning process performed by humans. Other approaches use the soiling ratio and cost of cleaning to model the cleaning frequency, but these models aren’t considering the potential of ra

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Nayak, Jayato, and Sankha Chakrabortty. "Role of nanotechnology in environmental cleaning." In Clean Technologies Toward the Development of a Sustainable Environment and Future. IWA Publishing, 2023. http://dx.doi.org/10.2166/9781789063783_0263.

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Abstract Air, water, and soil pollution pose serious threats to ecosystem health and should be prioritized as a global issue of paramount importance. Emerging technologies such as ‘nanoremediation,’ which embraces the concept of nanotechnology through the development of nanoparticles (NPs), join established procedures such as thermal treatment, pump-and-treat, and chemical oxidation in the arsenal of remediation approaches. Nanoremediation is the process of using designed NPs to clean up polluted medium; it is more efficient and cost-effective than conventional approaches. Nanomaterials' uniqu

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Kamin, Zykamilia, and Rosalam Sarbatly. "Melt-Blown Nanofibers for Oil Spills." In Cutting-Edge Advances in Nanofibers and Fibers. IGI Global, 2025. https://doi.org/10.4018/979-8-3373-0230-0.ch008.

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This chapter focuses on the application of nanofiber technology for cleaning oil spill, an important environmental problem. It provides the information on the characterization of nanofiber materials and their effectiveness in absorbing pollutants due to a high value of the surface area to volume ratio. The chapter also goes further describing different kinds of polymer nanofibers that exist. Aside from melt blowing, other common nanofiber fabrication methods are as follows: electrospinning, force spinning, and template synthesis. It discusses the manner in which nanofibers engage with oil and

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Fourmaux, Sylvain, Stephane Payeur, Philippe Lassonde, Jean-Claude Kieffer, and Francois Marti. "Laser Pulse Contrast Ratio Cleaning in 100 TW Scale Ti: Sapphire Laser Systems." In Laser Systems for Applications. InTech, 2011. http://dx.doi.org/10.5772/24038.

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Srin, K. S., J. Ramkumar, and Ravi N. Bathe. "Nanomachining." In Nature-Inspired Self-Cleaning Surfaces in the Nanotechnology Era. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.111369.

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LIPSS (LASER Induced Periodic Surface Structures) is a term used to describe ordered or periodically structured nanostructures. Until newly, this term was not extensively researched or optimized for use in superhydrophobic self-cleaning applications. This machining method is one of the most sophisticated and cutting-edge ways to create nanofeatures like grooves and bumps without using any chemicals. Here we are trying to explore with polarization, machining speed, number of pulses, LASER fluence, shielding gas, and other parameters dependence on surface nanostructures and features that varied

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Chegra, Sylvia, and Martina N. Cummins. "Sterilization and Decontamination." In Tutorial Topics in Infection for the Combined Infection Training Programme. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198801740.003.0030.

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Decontamination is the combination of processes (including cleaning, disinfection, and sterilization) used to make a re-usable item safe for medical use. It is important to have an understanding of the meaning of each of these terms as well as their application. Cleaning: a process to remove infectious agents and organic matter. The effectiveness of reducing microbial contamination will vary dependent upon the efficacy of the cleaning process and the initial bio- burden. It is important to note that this process does not necessarily destroy infectious agents and is a pre-requisite to disinfect

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Morteza Naghib, Seyed, and Hamid Reza Garshasbi. "Nanoparticles in Environmental Pollution Remediation of Xenobiotics." In Green Plant Extract-Based Synthesis of Multifunctional Nanoparticles and their Biological Activities. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815179156123010007.

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Environmental deterioration is currently a major problem for both emerging and wealthy nations. Extensive industrialization and intensive agricultural activity are the main causes of land, water, and air contamination. There are numerous conventional treatments for various environmental contaminants, but each has drawbacks. As a result, a different approach is necessary, one that is efficient, less harmful, and produces better results. In terms of cleaning up the environment, nanomaterials have garnered much interest. Nanomaterials outperform more traditional methods for environmental remediat

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Konferenzberichte zum Thema "Cleaning ratio"

Simmons, Bobby G. "Foam Cleaning Innovations, past and Future." In CORROSION 1993. NACE International, 1993. https://doi.org/10.5006/c1993-93377.

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ABSTRACT Significant advances in foam cleaning technology, past and present is discussed. An economical solution to corrosion control through complete foam recycle, both the gaseous phase and the liquid phase is presented as a viable process. Cyclical corrosion processes associated with aerated foam cleaning solutions in the presence of iron and copper can be substantially be reduced by usage of reducing agents, inert gas, and complete recycle. Problems previously associated with lack of foam flow through upper condenser tubes have been defined as the result improper attention to the ratio of

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Mintz, T. S., and K. Shannon. "Corrosion of Aluminum Fined Copper-Tube Heat Exchanger Coils." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-05963.

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Abstract Aluminum finned copper-tube heat exchanger coils at an industrial facility experienced localized corrosion after a few months of operation. Initial testing indicated that the potential cause of corrosion was due to a process known as formicary corrosion. The source of the corrosion was investigated by performing air sampling of the location prior to and during the floor cleaning process as a way to determine whether the chemical cleaners used in the facility were potentially responsible for the accelerated corrosion. While some aggressive species were identified prior to the floor cle

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Bae, Han-Jin, Jae-Jin Baek, Chae-Suk Lee, et al. "Improvement of Blasting Productivity by Optimizing Blasting-Related Operation Parameters." In Paint and Coatings Expo (PACE) 2007. SSPC, 2007. https://doi.org/10.5006/s2007-00006.

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Abstract As a means of surface preparation for protective coatings, abrasive blasting provides proper surface roughness and increases the surface area, which are critical in achieving physical and chemical adhesion between steel surface and organic coatings. For application of high-performance coating in a new shipbuilding, the abrasive blasting cleaning is widely favored primarily because of its economic and performance benefits. The abrasive blasting, however, also requires the significant amount of labor hour, whereas its efficiency mainly depends on the blaster’s skill. Blasting cleaning p

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Mosher, Winston, Tamer Crosby, and Tony Lam. "Methodology for the Evaluation of Batch Corrosion Inhibitor Films and Their Integrity." In CORROSION 2021. AMPP, 2021. https://doi.org/10.5006/c2021-16632.

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Abstract Proper maintenance of pipelines reduces the occurrences of failures due to internal corrosion to a remarkable degree. Primarily, the two methods employed in maintaining a pipeline are mechanical cleaning (pigging) and chemical treatment, (corrosion inhibitors & biocides) often used in combination. The technique known as batch filming uses a “pill” of concentrated chemical contained between two pipeline pigs; a lead pig and a filming pig (referred to as a pig “train”). In theory, the filming pig allows a small volume of chemical to continuously bypass the rear of the filming pig as

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Kim, Gyeong Rae, Tae Sung Kang, Yeon Ho Cho, and Jong Man Han. "Effect of Flash Rust on Protective Properties of Organic Coatings." In CORROSION 2008. NACE International, 2008. https://doi.org/10.5006/c2008-08011.

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Abstract For the proper adhesion of a coating, rusts, contaminants and damaged shop primers are removed by the grit blast on block surface of ships and offshore structures. However, the flash rusts are easily produced while block is waited for coating on its surfaces, especially in rainy season. The flash rusts on the blasted surface shall be removed by the re-blast or power tool cleaning. The purpose of this study is to review the effect of the flash rust and surface roughness on the coating performance. The performance of epoxy coated steel with the flash rust was evaluated by adhesion force

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Winkeler, Ir Max A. "A New Breed of Tank Linings." In SSPC 2003. SSPC, 2003. https://doi.org/10.5006/s2003-00051.

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Abstract For more than 50 years, the industry has been using coatings and linings for the protection of steel tanks used for the storage, transport, or processing of chemicals. Sometimes, the linings protect the chemicals from contamination by steel or rust or are used for easier cleaning of the tank walls. In all cases, the lining has to adhere firmly to the substrate without film defects such as blistering, peeling or cracking which would interfere with their function. During those 50 years, new resins, pigments, and additives, as well as surface preparation and application techniques, have

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Ghazlani, Mohamed-Ali, Nigel Davenport, Alain Champlain, Bernard Paquet, and Smail Kalla. "CFD Modelling of Gas Turbine Combustor Post-Shutdown: Heat Soak-Back Phenomenon." In Vertical Flight Society 70th Annual Forum & Technology Display. The Vertical Flight Society, 2014. http://dx.doi.org/10.4050/f-0070-2014-9631.

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Heat soak-back to engine components on shutdown, due to the thermal inertia of heated turbine parts, has the potential to cause deposits to build up in fuel injectors which can over time block the injectors. Blocked or partially blocked injectors must then be removed from the engine, inspected and sent for cleaning. The potential for injector blockage on helicopter engines in particular is elevated due to the generally cramped engine compartments which trap heat, and also to the helicopter engine's unique operating characteristics that allow for a very short time interval between maximum power

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Campanharo Gabriel, André, and Renato Siqueira. "Effects of Diameters Ratio on the efficiency of cleaning process in horizontal wells." In 16th Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2016. http://dx.doi.org/10.26678/abcm.encit2016.cit2016-0711.

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Jarvis, Julie M., Allen T. Vieiria, Paul J. Babel, and Paul J. Kochis. "Eliminating Steam Blow Piping Overcleaning During Power Plant Startup." In ASME 2008 Power Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/power2008-60129.

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This paper investigates and justifies the use of a minimum necessary cleaning force ratio or cleaning factor for steam blows. Steam line blowing is an operational cleaning method used to clean steam piping and reheaters prior to turbine powering for steam power plants. The steam blows remove weld bead deposits, slag, debris, surface scale, and other foreign materials which could be carried into the steam turbines and damage the turbine blades during normal plant operation. Piping is blown, bypassing the turbine, with sufficient boiler pressure to ensure the dynamic pressure throughout the pipi

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Singer, Gabriela, Wei Shao, Songhua Chen, Phil Hawley, Z. Harry Xie, and Shouxiang Mark Ma. "Evaluating the Effectiveness of Rock Cleaning." In 2022 SPWLA 63rd Annual Symposium. Society of Petrophysicists and Well Log Analysts, 2022. http://dx.doi.org/10.30632/spwla-2022-0064.

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Core cleaning is a fundamental step in laboratory core analysis since it affects the interpretation of core data, thus its applications. For example, the thoroughness of core cleaning is an essential factor for characterizing reservoir rock wettability (Ma and Amabeoku, 2015). Although well-established core cleaning methods exist, characterizing the effectiveness of these methods continues to be a challenge. In this study, we present an innovative method based on NMR T_2 measurements at 100% water saturation (S_W1). Since T_2 of the water phase is sensitive to oil coating on solid surface, the

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Berichte der Organisationen zum Thema "Cleaning ratio"

Jalkanen, Jukka-Pekka, Erik Fridell, Jaakko Kukkonen, et al. Environmental impacts of exhaust gas cleaning systems in the Baltic Sea, North Sea, and the Mediterranean Sea area. Finnish Meteorological Institute, 2024. http://dx.doi.org/10.35614/isbn.9789523361898.

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Description: Shipping is responsible for a range of different pressures affecting air quality, climate, and the marine environment. Most social and economic analyses of shipping have focused on air pollution assessment and how shipping may impact climate change and human health. This risks that policies may be biased towards air pollution and climate change, whilst impacts on the marine environment are not as well known. One example is the sulfur regulation introduced in January 2020, which requires shipowners to use a compliant fuel with a sulfur content of 0.5% (0.1% in SECA regions) or use

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