Relevant bibliographies by topics / Powder electrostatic technology

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Powder electrostatic technology'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Powder electrostatic technology"

1

Shalygina, Oksana, Lyuidmyla Bragina, and Mykola Kuryakin. "Powder Electrostatic Technology of Household Appliance Enamelling." Chemistry & Chemical Technology 6, no. 4 (2012): 435–41. http://dx.doi.org/10.23939/chcht06.04.435.

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Xiao, Kai Ye, Hai Xu, Zhi Wei Guo, and Wen Zheng. "Research of the Surface Treatment Process of Bonded NdFeB Magnet with Composite Powder Electrostatic Spraying." Solid State Phenomena 278 (July 2018): 63–71. http://dx.doi.org/10.4028/www.scientific.net/ssp.278.63.

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Compared with the traditional air spraying technique and electroplate method, the coating defects of bonded NdFeB magnet, such as the workpiece hanging point, the pinhole, the bubble, have been solved by using the composite powder electrostatic spraying as surface treatment technology, along with the EE epoxy paint as primer coating and PU polyurethane paint as surface coating. The coating of this composite powder electrostatic spraying is uniform and compact, and the coating has strong adhesion and corrosion resistance. This paper gives a detailed introduction to the composite powder electrostatic spraying, including the choice of some important parameters and the unique hanging tools of composite powder electrostatic spraying.
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Yang, Qingliang, Yingliang Ma, and Jesse Zhu. "Applying a novel electrostatic dry powder coating technology to pellets." European Journal of Pharmaceutics and Biopharmaceutics 97 (November 2015): 118–24. http://dx.doi.org/10.1016/j.ejpb.2015.10.006.

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Bailey, Adrian G. "The science and technology of electrostatic powder spraying, transport and coating." Journal of Electrostatics 45, no. 2 (1998): 85–120. http://dx.doi.org/10.1016/s0304-3886(98)00049-7.

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Beloni, Ervin, and Edward L. Dreizin. "Ignition of Titanium Powder Layers by Electrostatic Discharge." Combustion Science and Technology 183, no. 8 (2011): 823–45. http://dx.doi.org/10.1080/00102202.2011.554466.

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Nukala, Ravi Kumar, Harikrishna Boyapally, Ian J. Slipper, Andy P. Mendham, and Dennis Douroumis. "The Application of Electrostatic Dry Powder Deposition Technology to Coat Drug-Eluting Stents." Pharmaceutical Research 27, no. 1 (2009): 72–81. http://dx.doi.org/10.1007/s11095-009-0008-y.

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Baitimerov, R. M., and V. A. Bykov. "Processing of Alumina Reinforced Copper Metal Matrix Composite by Selective Laser Melting Technology." Solid State Phenomena 316 (April 2021): 175–80. http://dx.doi.org/10.4028/www.scientific.net/ssp.316.175.

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For the development of the additive technologies it is necessary to expand the range of the used materials. One of the most promising directions is the creation of products from composite materials. In this work copper-alumina composite powder was prepared by ball milling, and used in selective laser melting, to produce a composite material. The raw powder materials consisted of the gas atomized Cu powder (with the regular spherical shape and mean particle diameter of 32 μm) and alumina powder, produced by condensation of vapor on electrostatic filter (average particle size is about 220 nm). The alumina weight ratio was 5%. Four 30x10x6 mm copper-alumina specimens were manufactured. The scanning electron microscopy was used for the analysis of composite microstructure. Obtained copper-alumina composite material has higher hardness, in comparison with cast copper (HRB is 60 and 45, respectively).
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Wei, Yanan, and Youxing Liu. "Study of dispersion mechanisms of modified SiC powder: electrostatic repulsion and steric hindrance mechanism." New Journal of Chemistry 43, no. 35 (2019): 14036–44. http://dx.doi.org/10.1039/c9nj02131k.

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Jing, Zhehao, Yingliang Ma, and Jesse Zhu. "Application of a novel electrostatic dry powder coating technology on capsules for enteric release." Journal of Drug Delivery Science and Technology 68 (February 2022): 103058. http://dx.doi.org/10.1016/j.jddst.2021.103058.

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Nakhaev, M. R. "Interphase phenomena during humidification electrostatic fiber concrete." Herald of Dagestan State Technical University. Technical Sciences 49, no. 1 (2022): 140–48. http://dx.doi.org/10.21822/2073-6185-2022-49-1-140-148.

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Objective. The targets of modern construction require the search and development of new efficient technologies. The main trend in building architecture is the creation of spectacular (buildings-symbols, objects of competitions of countries) objects and structures that attract the attention of people and add to the list of unique attractions. To implement such projects, it is necessary to introduce high-tech advanced techniques, which is the electrostatic method of manufacturing fiberreinforced concrete.Method. The paper considers a new method of forming products and structures from fiber-reinforced concrete using electrostatics. An important place in the method is occupied by the physics of interfacial phenomena, namely wetting and capillary effects. The electrostatic deposition of layers of dry concrete mixture on the shaping frame occurs with the help of electrostatic sprayers.Result. This method allows saving cement, due to the use of a water-cement ratio close to the theoretical value. The issue of compaction of applied layers of dry concrete mix due to wetting with water with surface-active additives is discussed. In this regard, the kinetics of filling through and dead-end capillaries with water and other aspects of the new technology are considered. A hydrophilic binder has been developed using calcium lignosulfonate additive, which makes it possible to demonstrate the effectiveness of the electrostatic method in the future.Conclusion. The processes of wetting and the kinetics of liquid filling capillaries and channels of various shapes between the particles of the dry concrete mixture, as well as the compaction of the powder system as a result of moisture, will make it possible to realize difficult and unique projects in reality. The developed hydrophilic cement based on the surface-active additive LST (0.25%) contributes to the effect of interfacial electrostatic adhesion, thereby improving the properties of fiber-reinforced concrete.
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Dissertations / Theses on the topic "Powder electrostatic technology"

1

Pei, Chunlei. "DEM-CFD analysis of contact electrification and electrostatic interactions during powder handling processes." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/4871/.

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Electrostatic phenomena are pervasive in powder handling processes. In this study, contact electrification and electrostatic interactions during powder handling processes are explored using the discrete element method coupled with computational fluid dynamics (DEM-CFD), in which contact electrification and electrostatic interaction models are developed and implemented. The effects of particle shape on contact electrification are also investigated, for which multi-sphere methods are adapted and implemented into the DEM-CFD. The electrostatic and dynamic behaviours in various powder handling processes are analyzed, which include contact electrification of spherical particles during fluidization; electrostatic interactions during deposition of mono-charged and bi-charged particles; contact electrification and electrostatic interactions of spherical particles during fluidization; contact electrification of elongated particles in a vibrating container and particles of arbitrary shapes in a rotating drum. It is found that charge accumulation and distribution of particles are caused by contact electrification and dispersion of mono-charged particles and agglomeration of bi-charged particles are induced by electrostatic interactions. The combined effects of contact electrification and electrostatic interactions can alter the dynamic behaviours of particles and the performance of powder handling processes. Non-uniform charge distributions can be induced on particles of irregular shapes and the charge accumulation is also affected by particle shapes.
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Одинцова, Олександра Павлівна. "Безпігментні одношарові склоемалеві покриття для побутової техніки". Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/33516.

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Дисертація на здобуття наукового ступеня кандидата технічних наук (доктора філософії) за спеціальністю 05.17.11 "Технологія тугоплавких неметалічних матеріалів". – Національний технічний університет "Харківський політехнічний інститут", Харків, 2017. Дисертацію присвячено розробці безпігментних одношарових хімічно та термічно стійких темнозабарвлених склоемалевих покриттів для захисту побутової техніки, зокрема кухонних газових та електричних плит, що отримуються за технологією POESTA. Синтезовано основи отримання покриттів вказаного типу, згідно із якими розробляється скломатриця із заданими фізико-хімічними властивостями, на основі якої отримується склоемалева фрита шляхом введення в оптимізований склад скла комплексного активатору зчеплення, одночасно виконуючий роль активного забарвлюючого комплексу, який поєднує задані міцнісні характеристики безпігментних одношарових темнозабарвлених склоемалевих покриттів. Встановлено межі значень структурних факторів, які забезпечують міцну структуру кремнекисневого каркасу скла в системі R₂O (Na₂O+K₂O+Li₂O) – RO (CaO+BaO+SrO+MgO) – TiO₂ – ZrO₂ – B₂O₃ – SiO₂ і заданий рівень її структурнозалежних експлуатаційних властивостей за рахунок встановлених співвідношень склоутворювачів і модифікаторів. Розроблено склад і співвідношення комплексного активатора зчеплення із урахуванням його впливу на характеристики міцності системи "склоемаль – сталь", корозійну здатність склорозплаву та експлуатаційні властивості покриттів, який одночасно виконує роль активного забарвлюючого комплексу. Обрано іонний механізм забарвлення та встановлено колірні координати в ККС XYZ, RGB, L*a*b. Проведено промислові та лабораторно-промислові випробування на підприємствах та розроблено практичні рекомендації щодо використання результатів.<br>The dissertation on competion of a scientific degree of the candidate of engineering science on a speciality 05.17.11 "Technology of refractory nonmetallic materials". – National Technical University "Kharkiv Polytechnical Institute", Kharkiv, 2017. The dissertation is devoted to the development of pigments free direct chemically and thermally resistant dark-colored glass-enamel coatings for the protection of household appliances, in particular kitchen gas and electric plates, obtained by the technology POESTA. The bases of obtaining the coatings of this type are synthesized, according to which the glass matrix is developed with the given physicochemical properties, on the basis of which glassmelee frit is obtained by introducing into the optimized composition of the MS complex agglomer activator, simultaneously performing the role of the active coloring complex which combines the specified strength characteristics of pigments free direct glass-enamel coatings with their dark coloring. The boundaries of the values of structural factors, which provide a solid structure of the silica-oxygen glass frame in the system R₂O (Na₂O+K₂O+Li₂O) – RO (CaO+BaO+SrO+MgO) – TiO₂ – ZrO₂ – B₂O₃ – SiO₂ and the specified level of its structurally dependent performance properties due to the established ratios of glass modifiers and modifiers. The composition and ratio of the complex coupler activator have been developed taking into account its influence on the strength characteristics of the glass-enamel-steel system, the corrosion capacity of the glass-fiber alloy and the operational properties of the coatings at the firing temperatures of 800 to 830 °C. Selected the ionic mechanism of color, which was realized by the components of the filling station, and the color coordinates are established in the XYZ, RGB, L*a*b, according to RAL. Industrial and laboratory-industrial tests were carried and practical recommendations for the use of development results are developed.
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Одинцова, Олександра Павлівна. "Безпігментні одношарові склоемалеві покриття для побутової техніки". Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/33515.

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Дисертація на здобуття наукового ступеня кандидата технічних наук (доктора філософії) за спеціальністю 05.17.11 "Технологія тугоплавких неметалічних матеріалів". – Національний технічний університет "Харківський політехнічний інститут", Харків, 2017. Дисертацію присвячено розробці безпігментних одношарових хімічно та термічно стійких темнозабарвлених склоемалевих покриттів для захисту побутової техніки, зокрема кухонних газових та електричних плит, що отримуються за технологією POESTA. Синтезовано основи отримання покриттів вказаного типу, згідно із якими розробляється скломатриця із заданими фізико-хімічними властивостями, на основі якої отримується склоемалева фрита шляхом введення в оптимізований склад скла комплексного активатору зчеплення, одночасно виконуючий роль активного забарвлюючого комплексу, який поєднує задані міцнісні характеристики безпігментних одношарових темнозабарвлених склоемалевих покриттів. Встановлено межі значень структурних факторів, які забезпечують міцну структуру кремнекисневого каркасу скла в системі R₂O (Na₂O+K₂O+Li₂O) – RO (CaO+BaO+SrO+MgO) – TiO₂ – ZrO₂ – B₂O₃ – SiO₂ і заданий рівень її структурнозалежних експлуатаційних властивостей за рахунок встановлених співвідношень склоутворювачів і модифікаторів. Розроблено склад і співвідношення комплексного активатора зчеплення із урахуванням його впливу на характеристики міцності системи "склоемаль – сталь", корозійну здатність склорозплаву та експлуатаційні властивості покриттів, який одночасно виконує роль активного забарвлюючого комплексу. Обрано іонний механізм забарвлення та встановлено колірні координати в ККС XYZ, RGB, L*a*b. Проведено промислові та лабораторно-промислові випробування на підприємствах та розроблено практичні рекомендації щодо використання результатів.<br>The dissertation on competion of a scientific degree of the candidate of engineering science on a speciality 05.17.11 "Technology of refractory nonmetallic materials". – National Technical University "Kharkiv Polytechnical Institute", Kharkiv, 2017. The dissertation is devoted to the development of pigments free direct chemically and thermally resistant dark-colored glass-enamel coatings for the protection of household appliances, in particular kitchen gas and electric plates, obtained by the technology POESTA. The bases of obtaining the coatings of this type are synthesized, according to which the glass matrix is developed with the given physicochemical properties, on the basis of which glassmelee frit is obtained by introducing into the optimized composition of the MS complex agglomer activator, simultaneously performing the role of the active coloring complex which combines the specified strength characteristics of pigments free direct glass-enamel coatings with their dark coloring. The boundaries of the values of structural factors, which provide a solid structure of the silica-oxygen glass frame in the system R₂O (Na₂O+K₂O+Li₂O) – RO (CaO+BaO+SrO+MgO) – TiO₂ – ZrO₂ – B₂O₃ – SiO₂ and the specified level of its structurally dependent performance properties due to the established ratios of glass modifiers and modifiers. The composition and ratio of the complex coupler activator have been developed taking into account its influence on the strength characteristics of the glass-enamel-steel system, the corrosion capacity of the glass-fiber alloy and the operational properties of the coatings at the firing temperatures of 800 to 830 °C. Selected the ionic mechanism of color, which was realized by the components of the filling station, and the color coordinates are established in the XYZ, RGB, L*a*b, according to RAL. Industrial and laboratory-industrial tests were carried and practical recommendations for the use of development results are developed.
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Mahmood, Paracha Ayyaz. "Design and fabrication of Mems-based, vibration powered energy harvesting device using electrostatic transduction." Phd thesis, Université Paris-Est, 2009. http://tel.archives-ouvertes.fr/tel-00584339.

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Due to size effects, the microtechnologies that are used to manufacture micro-sensors, allowed a drastic reduction of electrical power consumption. This feature contributed to the emergence of the concept of autonomous sensors, which have the ability to take the energy needed for their operation from the environment where they are located. Among the different energy sources, our choice was made on ambient mechanical vibrations. The electromechanical conversion is done within a transducer integrated with a micromechanical structure. In this work, we have designed and fabricated an electrostatic transducer based on silicon-glass technology, which required the development of a dedicated deep etching process. The device was tested experimentally and we have obtained a conversion of mechanical energy into electrical energy, corresponding to a power of 61 nW, with a device whose surface area is only 66 mm². This device is the first miniaturized silicon converter based on electrostatic transduction which does not use an electret
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Books on the topic "Powder electrostatic technology"

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Duvvury, Charvaka, and Harald Gossner. System Level ESD Co-Design. Wiley-Interscience, 2015.

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Duvvury, Charvaka, and Harald Gossner. System Level ESD Co-Design. Wiley & Sons, Incorporated, John, 2015.

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Duvvury, Charvaka, and Harald Gossner. System Level ESD Co-Design. Wiley & Sons, Incorporated, John, 2017.

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Book chapters on the topic "Powder electrostatic technology"

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Tanoue, Ken-ichiro, and Hiroaki Masuda. "Electrostatic Separation." In Powder Technology Handbook. CRC Press, 2019. http://dx.doi.org/10.1201/b22268-57.

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Tanoue, Ken-ichiro. "Electrostatic Powder Coating." In Powder Technology Handbook. CRC Press, 2019. http://dx.doi.org/10.1201/b22268-64.

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Katz, Jacob. "The Electrostatic Precipitator: Application and Concepts." In Handbook of Powder Science & Technology. Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-6373-0_16.

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Liu, Z., A. J. M. Pemen, E. J. M. van Heesch, K. Yan, G. J. J. Winands, and D. B. Pawlok. "A Multiple-switch Technology for High-power Pulse Discharging." In Electrostatic Precipitation. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89251-9_147.

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Xu, Han, Li Xionghao, Liu Min, Jiang Hai, and Han Yi. "Research on Complex Multi-pollutants Control Technology in a Large-scale Coal-fired Power Plant." In Electrostatic Precipitation. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89251-9_116.

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Dehuan, Lin, Zheng Guoqiang, Qiu Jiangxin, and Guo Jun. "Applying the Technology of Compounded Type Power Control Rapping to Reduce the Outlet Emission Concentration." In Electrostatic Precipitation. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89251-9_61.

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Biao, Xie. "Model EE II Technology in 2#600MW Unit of Electrostatic Precipitator Application for GUODIAN Kaili Power Plant." In Electrostatic Precipitation. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89251-9_37.

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Biao, Xie. "Model EE I Technology in 1#125 MW Unit of Electrostatic Precipitator Application for GUODIAN Kaili Power Plant." In Electrostatic Precipitation. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89251-9_36.

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Tanoue, Ken-ichiro, and Hiroaki Masuda. "Electrostatic Separation." In Powder Technology. CRC Press, 2006. http://dx.doi.org/10.1201/9781420044133.ch1.13.

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"13 Electrostatic Separation." In Powder Technology. CRC Press, 2006. http://dx.doi.org/10.1201/9781420044133-18.

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Conference papers on the topic "Powder electrostatic technology"

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Kitamura, Tomohiro, Tatsushi Matsuyama, Junichi Ida, and Hideo Yamamoto. "Evaluation of Electrostatic Charging of Powder using Two Component System." In 5th Asian Particle Technology Symposium. Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-2518-1_143.

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Tsao, Teng-Yueh, and Jen-Yuan (James) Chang. "Application of Electrostatic Adhesion Method in Metal-Powder-Based Additive Manufacturing Layer-Forming Process." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88741.

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Similar to direct energy deposition (DED) technology, electrostatic adhesion method can also be employed to deposit powder on targeted areas without direct contact. In this paper, feasibility of utilizing the electrostatic adhesion method (EAM) in material deposition step of metal-power-based additive manufacturing is assessed through theoretical models and experimental verifications. A dielectric layer is proposed to be pre-coated on targeted areas to keep the powders being electrostatically attracted and charged without dropping before laser scanning process. Through this study, it is found that the net force of a single metallic particle on top of the deposited powder layer with a different thickness of the dielectric layer can be determined, leading to the suggestion of suitable coating thickness corresponding with desired particle radius. Results showed that the deposition layer thickness can be predicted with the knowing coated dielectric layer thickness and the powder size distribution. With the proposed electrostatic deposition method, a thinner layer compared to DED technology can be deposited, while maintaining its ability to deposit powder layer over a larger area. Through experiments, the developed electrostatic model is validated with results indicating that the deposition layer thickness can be predicted and controlled with the knowing coated dielectric layer thickness and the powder size distribution.
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Gourlaouen, V., R. Dominguez, F. Monerie-Moulin, and M. Mendelsohn. "Plastic Coating Properties Obtained by Flame Spraying Process and Their Applications." In ITSC 1999, edited by E. Lugscheider and P. A. Kammer. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 1999. http://dx.doi.org/10.31399/asm.cp.itsc1999p0841.

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Abstract Electrostatic fluidized bed spraying is a coating process that is often used for coating plastic. A novel flame spray technology with a controlled atmosphere was developed by Air Liquide in order to realize coatings with thermoplastics as well as composite coatings such as plastic/ceramic or plastic/metal. This technology expands the scope of the applications of plastic coatings especially for all types of shapes and materials as well as for on-site coating. Two types of powder, namely Rilsan and Gotalene were used in this study. The tests were carried out by HTI, which is Air Liquide's partner in the development of such applications. After introducing the principle of this process, this paper presents and discusses the coating process and the properties of such coatings. Then the advantages and limitations of the process are highlighted. Paper includes a German-language abstract.
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Peng, Po-Lin, Li-Wei Chu, Yi-Feng Chang, et al. "Novel SCR structure for power supply protection in FinFET technology." In 2017 39th Electrical Overstress/Electrostatic Discharge Symposium (EOS/ESD). IEEE, 2017. http://dx.doi.org/10.23919/eosesd.2017.8073455.

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Narita, Koki, and Mototsugu Okushima. "CDM protection design using internal power node for cross power domain in 16nm CMOS technology." In 2016 38th Electrical Overstress/Electrostatic Discharge Symposium (EOS/ESD). IEEE, 2016. http://dx.doi.org/10.1109/eosesd.2016.7592557.

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Guimond, David P., Matthew E. Thomas, Roberto DiSalvo, Adam Elliot, and D. Scott Crocker. "Insertion of Electrostatically Charged Fuel Atomization Technology Into a U.S. Navy Shipboard Gas Turbine Engine." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-54298.

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Recent breakthroughs in the field of hydrocarbon fuel electrostatic charging techniques have now permitted the opportunity for the Navy to consider implementing this technology into shipboard gas turbines. This research effort is focused toward electrostatic atomization insertion into a U.S. Navy Shipboard Rolls Royce Corporation 501-K research engine at the Naval Surface Warfare Center, Carderock Division (NSWCCD). Specific milestones achieved thus far include: (a) Spray demonstration of an electrostatically boosted 501-K gas turbine fuel injector prototype at fuel flows from 40 PPH to 250 PPH. (b) Electrostatic charging effect measurements on the droplet size and patternation of a 501-K simplex atomizer configuration. (c) Numerical modeling of the influence electrostatic charging has on secondary atomization breakup and predicted particulate emissions. This paper documents results associated with injector conceptual design, electrode integration, atomization measurements, numerical modeling and fuel injection system integration. Preliminary results indicate electrostatic boosting may be capable of reducing particulate emissions up to 80% by inserting the appropriate fuel injector.
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Dissegna, Mariano, Lorenzo Cerati, Luca Cecchetto, et al. "CDM circuit simulation of a HV operational amplifier realized in 0.35um smart power technology." In 2007 29th Electrical Overstress/Electrostatic Discharge Symposium (EOS/ESD). IEEE, 2007. http://dx.doi.org/10.1109/eosesd.2007.4401732.

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Faleg, Francesco, Pietro Zanella, Stefano Riva, Romano Romani, and Paolo Fidanzati. "Development OF an Electrostatic Grounding Technology for JUICE Photovoltaic Assembly." In 2019 European Space Power Conference (ESPC). IEEE, 2019. http://dx.doi.org/10.1109/espc.2019.8931989.

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Zhan, Carol Rouying, Patrice Besse, Jean-Philippe Laine, and Alain Salles. "High-Performance bi-directional SCR developed on a 0.13um SOI-based smart power technology for automotive applications." In 2017 39th Electrical Overstress/Electrostatic Discharge Symposium (EOS/ESD). IEEE, 2017. http://dx.doi.org/10.23919/eosesd.2017.8073448.

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Satsangi, Ann J., George H. Miley, Jalal B. Javedani, et al. "Innovative Technology for an Inertial Electrostatic Confinement (IEC) Fusion Propulsion Unit." In SPACE NUCLEAR POWER AND PROPULSION: Eleventh Symposium. AIP, 1994. http://dx.doi.org/10.1063/1.2950139.

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Reports on the topic "Powder electrostatic technology"

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Law, Edward, Samuel Gan-Mor, Hazel Wetzstein, and Dan Eisikowitch. Electrostatic Processes Underlying Natural and Mechanized Transfer of Pollen. United States Department of Agriculture, 1998. http://dx.doi.org/10.32747/1998.7613035.bard.

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The project objective was to more fully understand how the motion of pollen grains may be controlled by electrostatic forces, and to develop a reliable mechanized pollination system based upon sound electrostatic and aerodynamic principles. Theoretical and experimental analyses and computer simulation methods which investigated electrostatic aspects of natural pollen transfer by insects found that: a) actively flying honeybees accumulate ~ 23 pC average charge (93 pC max.) which elevates their bodies to ~ 47 V likely by triboelectrification, inducing ~ 10 fC of opposite charge onto nearby pollen grains, and overcoming their typically 0.3-3.9 nN detachment force resulting in non-contact electrostatic pollen transfer across a 5 mm or greater air gap from anther-to-bee, thus providing a theoretical basis for earlier experimental observations and "buzz pollination" events; b) charge-relaxation characteristics measured for flower structural components (viz., 3 ns and 25 ns time constants, respectively, for the stigma-style vs. waxy petal surfaces) ensure them to be electrically appropriate targets for electrodeposition of charged pollen grains but not differing sufficiently to facilitate electrodynamic focusing onto the stigma; c) conventional electrostatic focusing beneficially concentrates pollen-deposition electric fields onto the pistill tip by 3-fold as compared to that onto underlying flower structures; and d) pollen viability is adequately maintained following exposure to particulate charging/management fields exceeding 2 MV/m. Laboratory- and field-scale processes/prototype machines for electrostatic application of pollen were successfully developed to dispense pollen in both a dry-powder phase and in a liquid-carried phase utilizing corona, triboelectric, and induction particulate-charging methods; pollen-charge levels attained (~ 1-10 mC/kg) provide pollen-deposition forces 10-, 77-, and 100-fold greater than gravity, respectively, for such charged pollen grains subjected to a 1 kV/cm electric field. Lab and field evaluations have documented charged vs. ukncharged pollen deposition to be significantly (a = 0.01-0.05) increased by 3.9-5.6 times. Orchard trials showed initial fruit set on branches individually treated with electrostatically applied pollen to typically increase up to ~ 2-fold vs. uncharged pollen applications; however, whole-tree applications have not significantly shown similar levels of benefit and corrective measures continue. Project results thus contribute important basic knowledge and applied electrostatics technology which will provide agriculture with alternative/supplemental mechanized pollination systems as tranditional pollen-transfer vectors are further endangered by natural and man-fade factors.
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