Relevant bibliographies by topics / High efficiency magnetic separation

Academic literature on the topic 'High efficiency magnetic separation'

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Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "High efficiency magnetic separation"

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Morkun, Vladimir, Natalia Morkun, Vitalii Tron, Vladimir Golik, and Arkadii Davidkovich. "Increasing efficiency of iron ore magnetic separation by using ultrasonic technologies." E3S Web of Conferences 280 (2021): 08004. http://dx.doi.org/10.1051/e3sconf/202128008004.

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The research is aimed at solving the topical problem of enhancing efficiency of iron ore magnetic separation by applying ultrasonic technologies to identify optimal technological parameters of magnetic separation, improving controlled structural parameters of a magnetic separator and pretreating slurry by highenergy ultrasound to clean the ore material surface from fine-dispersed particles of minerals and slime, as well as disintegrate ore aggregates fed to the magnetic separator. The main tasks involve identifying regularities of influence of slurry pretreatment by high-energy ultrasound on properties of iron ore magnetic separation, determining regulations of improving technological and controlled structural parameters of the magnetic separator using ultrasonic methods, developing and substantiating methods to enhance efficiency of iron ore magnetic separation by applying ultrasonic technologies.
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Gu, Yu, Yingwen Xue, and Dawei Zhang. "Adsorption of aniline by magnetic biochar with high magnetic separation efficiency." Environmental Pollutants and Bioavailability 33, no. 1 (January 1, 2021): 66–75. http://dx.doi.org/10.1080/26395940.2021.1920469.

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Chen, Lu Zheng, Guo Dong Xu, Shu Ming Wen, Si Qing Liu, and Li Kun Gao. "Effect of Rod Arrangement in Matrix on High Gradient Magnetic Separation Performance." Advanced Materials Research 634-638 (January 2013): 3351–54. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.3351.

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The effect of rod arrangement in a rod matrix on high gradient magnetic separation (HGMS) performance has been comparatively investigated through a cyclic pilot-scale centrifugal HGMS separator, with contiguously and orthogonally arranged rod matrixes respectively. The results of investigation indicate that the arrangement of rod elements in the matrix has a distinct effect on the HGMS performance, for relatively low magnetic inductions; beyond the threshold magnetic induction, the magnetic induction dominates that of the arrangement and the importance of the arrangement is significantly weakened even vanished. It was thus concluded that the combinatorial optimization for magnetic elements in the matrix improves the collision efficiency of particles with matrix, and gives a superior performance in a HGMS separator, at a lower energizing consumption.
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Harada, Naoto, Shingo Hirano, Masahiro N. Machida, and Takashi Hosokawa. "Impact of magnetic braking on high-mass close binary formation." Monthly Notices of the Royal Astronomical Society 508, no. 3 (October 2, 2021): 3730–47. http://dx.doi.org/10.1093/mnras/stab2780.

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ABSTRACT Combining numerical simulations and analytical modelling, we investigate whether close binary systems form by the effect of magnetic braking. Using magnetohydrodynamics simulations, we calculate the cloud evolution with a sink, for which we do not resolve the binary system or binary orbital motion to realize long-term time integration. Then, we analytically estimate the binary separation using the accreted mass and angular momentum obtained from the simulation. In unmagnetized clouds, wide binary systems with separations of >100 au form, in which the binary separation continues to increase during the main accretion phase. In contrast, close binary systems with separations of <100 au can form in magnetized clouds. Since the efficiency of magnetic braking strongly depends on both the strength and configuration of the magnetic field, they also affect the formation conditions of a close binary. In addition, the protostellar outflow has a negative impact on close binary formation, especially when the rotation axis of the prestellar cloud is aligned with the global magnetic field. The outflow interrupts the accretion of gas with small angular momentum, which is expelled from the cloud, while gas with large angular momentum preferentially falls from the side of the outflow on to the binary system and widens the binary separation. This study shows that a cloud with a magnetic field that is not parallel to the rotation axis is a favourable environment for the formation of close binary systems.
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Zhao, Yang, and De Fu Cheng. "The Study on Submersibles Magnetic Separation System." Applied Mechanics and Materials 246-247 (December 2012): 1111–16. http://dx.doi.org/10.4028/www.scientific.net/amm.246-247.1111.

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In the traditional magnetic separation in dry conditions of magnetic filter jams caused by the efficiency of the machining decline. In order to solve this problem, filter arrangement in magnetic separation. Jam magnetic filter is success in reducing the through the use of prismatic-shaped filter. In addition, the separation effect of prismatic-shaped filters is added as high as, mesh filters used for high system routine.
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Chang, Jeong Ho, Ki Ho Kang, Jinsub Choi, and Young Keun Jeong. "High efficiency protein separation with organosilane assembled silica coated magnetic nanoparticles." Superlattices and Microstructures 44, no. 4-5 (October 2008): 442–48. http://dx.doi.org/10.1016/j.spmi.2007.12.006.

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Wen, Hai Tao, Su Qin Li, Chang Quan Zhang, and Wei Wei. "Application of Super Conducting High Gradient Magnetic Separation Technology on Resource Utilization of Low Grade Iron Ore." Advanced Materials Research 968 (June 2014): 168–72. http://dx.doi.org/10.4028/www.scientific.net/amr.968.168.

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Nowadays, steel industry develops rapidly. However, lots of iron ore needed by China’s steel industry are imported from abroad. China’s dependence on foreign iron ore exceeds 70%. As a result, not only have large amounts of foreign currencies been spent but also a potential threat has been posed to the economic development of our country. Therefore, it is necessary for China to serve its economic production with lots of low grade iron ore. Since traditional beneficiation methods can cause serious environmental problems, High gradient magnetic separation(HGMS) is discussed in this paper. It can recycle tailings when disposing of low grade iron ore as well as solve the environmental problems caused by tailings and arising during the production process. Besides, high gradient magnetic separator can also raise the processing efficiency of low grade iron core. Therefore, high-gradient magnetic separation can not only increase economic returns but also protect ecological environment. With the maturity of super-conduction high gradient magnetic separation technology, super-conducting high gradient magnetic separation will produce better production effects.
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Ozaki, H., S. Kurinobu, T. Watanabe, S. Nishijima, and T. Sumino. "A new wastewater treatment system recovering magnetically immobilized microorganisms under strong magnetic field." Water Supply 4, no. 1 (February 1, 2004): 47–54. http://dx.doi.org/10.2166/ws.2004.0006.

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A new generation of high gradient magnetic separation (HGMS) has recently received attention again, especially for its applications in the field of water and wastewater treatment. The reason for this attention is that a newly developed superconducting magnet can be used to easily generate a high magnetic field, under which even weakly paramagnetic materials can be separated at high efficiency. We have developed a new wastewater treatment process using magnetic gel particles containing immobilized microorganisms and magnetic particles. The magnetic gel particles are separated and recovered from the effluent in water and wastewater treatment processes, and are then recycled to a bioreactor directly or reused after storing. In this research, a novel type of magnetic separator without a filter matrix was designed for the separation and recovery of magnetic gel particles with different magnetic characteristics. No backwashing is required for this new type of separator. By using the separator, polyethylene glycol (PEG) gel particles with 2% magnetite were continuously separated and recovered from the PEG gel particles with 0.04% magnetite at an efficiency of around 90%. The PEG gel particles containing nitrifying bacteria and magnetic particles were available for the oxidation of ammonia solution at a slightly lower nitrification rate than the PEG gel particles with nitrifying bacteria but without magnetite.
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Shah, Gaurav J., and Chang-Jin CJ Kim. "Meniscus-Assisted High-Efficiency Magnetic Collection and Separation for EWOD Droplet Microfluidics." Journal of Microelectromechanical Systems 18, no. 2 (April 2009): 363–75. http://dx.doi.org/10.1109/jmems.2009.2013394.

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Zheng, Xiayu, Yuhua Wang, and Dongfang Lu. "Particle capture efficiency of elliptic cylinder matrices for high-gradient magnetic separation." Separation Science and Technology 51, no. 12 (June 21, 2016): 2090–97. http://dx.doi.org/10.1080/01496395.2016.1201113.

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Dissertations / Theses on the topic "High efficiency magnetic separation"

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Пономаренко, Дарина Сергіївна. "Біотехнологія отримання магнітокерованого біосорбенту з активного мулу." Master's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/39647.

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Магістерська дисертація: 84 сторінки, 2 рисунки, 37 таблиць, 81 джерела. Біосорбція є одним з універсальних методів очистки води від іонів важких металів, що є економічно вигідною та екологічною альтернативою іншим промисловим методам. Однією з переваг даного методу є можливість застосування низьковартісних сорбентів, таких, як відходи біосами. Тому актуальним є пошук дешевого та простого для вилучення біологічного сорбенту, яким може стати активний мул водоочисних споруд. Метою роботи є визначення оптимального режиму отримання магнітокерованої фракції активного мулу для виготовлення магнітокерованого сорбенту на його основі. Об’єкти дослідження: геноми і протеоми мікроорганізмів активного мулу, присутніх в зразку, геном магнітотаксисної бактерії (МТБ) Magnetospirillum gryphiswaldense MSR-1, біомаса активного мулу «Чернігівводоканалу», високоградієнтна магнітна сепарація, високоградієнтні феромагнітні насадки. Предмети дослідження: ефективність вилучення магнітокерованої фракції активного мулу методом високоградієнтної магнітної сепарації. В роботі використано такі методи дослідження: біоінформатичний, метод високоградієнтної магнітної сепарації. В ході дослідження було показано, що мікроорганізми в складі активного мулу є потенційними продуцентами БМН; визначено, що найбільш ефективним для вилучення магнітокерованої фази активного мулу є режим швидкості 1,5 мл/хв та феромагнітна насадка у вигляді сітки – ефективність склала близько 20%.
Master’s thesis: 84 pages, 2 figures, 37 tables, 81 sources. Biosorption is an innovative method of removing heavy metal pollution, it is economically beneficial and ecological alternative to other industrial methods. One of its main benefits is an ability to use low cost biological adsorbents, as a waste biomass. Therefore it is important to search low cost, effective and easy to extract adsorbent, and waste biomass of activated sludge can be a material wich possesses such qualities. The aim of this work is to find an optimal speed mode and matrix to extract magnetically controlled phase of activated sludge for further sorbent production. Objects of study: genomes and proteomes of microorganisms of activated sludge, genome of magnetotaxis bacteria Magnetospirillum ryphiswaldense MSR-1, activated sludge biomass from «Chernihivvodokanal» plant, high gradient magnetic separation, high gradient ferromagnetic matrixes. Subject of study: the efficiency of activated sludge magnetically controlled phase removal using high efficiency magnetic separation method. The following research methods are used: bioinformatics, high efficiency magnetic separation method. The study shows that among microorganisms of activated sludge potential producers of BMN are found; the most efficient separation mode was 1,5 ml/min using ferromagnetic mesh as a matrix – approximately 20%.
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Kelland, D. R. "Magnetic enhancement in High Gradient Magnetic Separation." Thesis, University of Salford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384087.

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Bolt, Livia. "Magnetic separation using high-T←c superconductors." Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368332.

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Owings, Paul C. "High Gradient Magnetic Separation of nanoscale magnetite." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/12020.

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Master of Science
Department of Civil Engineering
Alexander P. Mathews
Nanoscale magnetite is being examined for possible uses as an adsorbent of heavy metals and for the enhancement of water treatment processes such as stripping of trichloroethylene (TCE) from contaminated water supplies and wastewaters. Methods for recovering nanoscale magnetite must be developed before the particles can be used in water treatment processes. This is necessary because expelling high amounts of particles into the environment will be unacceptable and costly; if captured they can be reused; additionally, they could potentially cause environmental impacts due to their stability in an aqueous environment and possible toxicity. Nanoscale magnetite is superparamagnetic, so it has a high magnetic susceptibility, and hence it is very attracted to magnetized materials. Utilizing the magnetic properties of magnetite may be one possible means of separating the particles from a treatment process. High Gradient Magnetic Separation (HGMS) has been studied for the separation of micron and even tenths of a micron size particles, but there is little experimental data for HGMS of nanoscale magnetite. This research looks to filter nanoscale magnetite through a HGMS and determine the capture efficiency of the filter. Subsequently, the filter was backwashed to determine particle recover efficiencies. The flow rate was adjusted to determine the dependency of particle capture efficiency on cross sectional velocity through the filter. Additionally, particle loading was changed to better understand the correlation of particle loading with capture efficiency. Filtrations for nanoscale magnetite dispersed with sodium tripolyphosphate were also completed as well as filtrations of nanoscale magnetite coated with silica and magnetite silica composites. Experimental data in this research indicates that magnetite nanoparticles can be captured at 99.8% efficiency or higher in a well-designed filtration system. Capture efficiencies around 99.8% have been found for magnetite. The silica coated magnetite and magnetite silica composites were captured at efficiencies as high as 96.7% and 97.9%, respectively. The capture efficiency of the dispersed magnetite is lower than non-dispersed magnetite and most promising at relatively low fluid flow velocities and particle loadings. The maximum capture efficiency for dispersed magnetite particles was 90.3%. Both magnetite and dispersed magnetite were successfully recovered using backwash at pH of 10 to 11.
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Tarrant, Lee. "A study of high gradient magnetic separation of strongly magnetic particles." Thesis, University of Salford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265394.

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Jirestig, Jan A. "High intensity and high gradient magnetic separation in mineral processing." Doctoral thesis, Luleå tekniska universitet, 1994. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25815.

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Natural minerals often lack well defined magnetic susceptibilities. Instead they must be thought of as occurring in a susceptibility range where the bulk susceptibility is affected by present impurities. Inclusions or foreign atoms in solid solution may alter a materials magnetic properties to a large extent. Mixed particles of dia andlor paramagnetic materials display a linear relationship while ferromagnetic inclusions involve a demagnetisation factor. The susceptibility distribution of value minerals in relation to gangue in the ore is the most important factor governing magnetic separation performance. Until recently, high gradient and high intensity separators of matrix type were exclusively used in wet processing. Now, new dry separators are extending the particle range for dry, fine particle separation. The capture characteristics of the matrix has been shown to change with the magnetic field strength. The separation cut is more precise at high fields, at low fields the capture probability graph cants. By superimposing the capture function on the susceptibility distribution of an ore, it is shown that materials containing value minerals at either high or low susceptibility is ideal for HGMS separation. Complex ores carrying value and gangue minerals distributed over a wide susceptibility range are unfavourable. The former situation is common in industrial mineral processing and in the upgrading of flotation concentrates. The latter susceptibility distribution is very common in complex sulphide ore feeds.
Godkänd; 1994; 20070429 (ysko)
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Xu, Chen Jie. "Biofunctional magnetic nanoparticles for protein separation with high specificity /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CHEM%202004%20XU.

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Cao, Zhengwen [Verfasser]. "Membrane reactors for separation and catalysis : high integration and high efficiency / Zhengwen Cao." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2014. http://d-nb.info/1051036240/34.

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Lal, Depak Kaura. "The removal of sulphur from coal by High Gradient Magnetic Separation." Thesis, Open University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328224.

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Miller, Samuel A. "Electroosmotic Flow Driven Microfluidic Device for Bacteria Isolation Using Magnetic Microbeads." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1544101007184486.

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Books on the topic "High efficiency magnetic separation"

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Kelland, David Ross. Magnetic enhancement in high gradient magnetic separation. Salford: University of Salford, 1988.

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Dahlin, D. C. Magnetic susceptibility of minerals in high magnetic fields. Washington, DC: U.S. Dept. of the Interior, Bureau of Mines, 1993.

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Svoboda, J. The selection of a matrix for the recovery of uranium by wet high-intensity magnetic separation. Randburg, South Africa: Council for Mineral Technology, 1985.

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Svoboda, J. The effect of particle size and colloid stability on the wet high-intensity magnetic separation of uranium from cyanidation reisdues. Randburg, South Africa: Council for Mineral Technology, 1986.

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Wright, A. G. Environmental considerations. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199565092.003.0012.

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Magnetic fields, with a magnitude comparable with that of the earth (10−4 tesla), affect trajectories of electrons and hence gain and collection efficiency. The inclusion of a high-permeability shield usually offers sufficient protection. Photomultiplier (PMT) performance is affected by electric field gradients generated by the proximity of a metal housing. The design criteria of such housings are discussed. Strong magnetic fields of the order of a tesla require special devices. Operation in harsh environments such as those encountered in oil well logging requires performance at high temperature (200 °C) and in situations of high shock and vibration expressed in terms of power spectral density. Rugged PMTs can meet all these requirements. Applications at cryogenic temperatures, such as liquid argon, can also be met with special PMTs.
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Rez, Peter. Electrical Power Generation: Fossil Fuels. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198802297.003.0004.

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Nearly all electrical power is generated by rotating a coil in a magnetic field. In most cases, the coil is turned by a steam turbine operating according to the Rankine cycle. Water is boiled and heated to make high-pressure steam, which drives the turbine. The thermal efficiency is about 30–35%, and is limited by the highest steam temperature tolerated by the turbine blades. Alternatively, a gas turbine operating according to the Brayton cycle can be used. Much higher turbine inlet temperatures are possible, and the thermal efficiency is higher, typically 40%. Combined cycle generation, in which the hot exhaust from a gas turbine drives a Rankine cycle, can achieve thermal efficiencies of almost 60%. Substitution of coal-fired by combined cycle natural gas power plants can result in significant reductions in CO2 emissions.
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Book chapters on the topic "High efficiency magnetic separation"

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Hara, Takeshi, Kosuke Miyamoto, Satoshi Makino, Shohei Miwa, Tohru Ikegami, Masayoshi Ohira, and Nobuo Tanaka. "High-Speed and High-Efficiency Separations by Utilizing Monolithic Silica Capillary Columns." In Monolithic Silicas in Separation Science, 249–72. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527633241.ch13.

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Oba, Eiji, Hideki Miyajima, Yuuichi Ishikawa, and Shuji Yoshizawa. "Magnetic Separation of High-Tc Superconducting Particles." In Advances in Superconductivity III, 831–34. Tokyo: Springer Japan, 1991. http://dx.doi.org/10.1007/978-4-431-68141-0_186.

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Bohnet, Matthias, and Thomas Lorenz. "Separation efficiency and pressure drop of cyclones at high temperatures." In Gas Cleaning at High Temperatures, 17–31. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2172-9_2.

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Prenger, F. C., W. F. Stewart, D. D. Hill, L. R. Avens, L. A. Worl, A. Schake, K. J. Aguero, D. D. Padilla, and T. L. Tolt. "High Gradient Magnetic Separation Applied to Environmental Remediation." In Advances in Cryogenic Engineering, 485–91. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2522-6_58.

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Zhou, Hao, Yujie Zhang, Zhiyin Hu, Ai Mu, and Xiangchao Gu. "High-Efficiency Separation and Purification of Taq DNA Polymerase." In Lecture Notes in Electrical Engineering, 663–72. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4801-2_68.

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Fathollahi, Bahram, Matthew B. Kerby, Spencer Wu, and Ring-Ling Chien. "High-Efficiency Separation in Microfluidic Devices for High-Throughput Screening of Kinases." In Micro Total Analysis Systems 2002, 377–79. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0295-0_126.

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Marder, M., N. Papanicolaou, and G. C. Psaltakis. "Phase Separation in a t - J Model." In Dynamics of Magnetic Fluctuations in High-Temperature Superconductors, 347–55. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-7490-9_35.

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Avens, Larry R., Laura A. Worl, Dennis D. Padilla, F. Coyne Prenger, and Dallas D. Hill. "Use of High Gradient Magnetic Separation for Actinide Applications." In Actinides and the Environment, 467–71. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-0615-5_29.

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Norrgran, Daniel A. "Advances in Magnetic Separation: Treating Fine High-Purity Material." In Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 13, Issue 1/2, 405–17. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470313916.ch49.

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Zhao, Qiang, and Jilai Xue. "Study of Siderite Fluidized Magnetization Roasting and Magnetic Separation." In 10th International Symposium on High-Temperature Metallurgical Processing, 75–83. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05955-2_7.

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Conference papers on the topic "High efficiency magnetic separation"

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Wu, Xinyu, and Huiying Wu. "A Numerical Study on Separation Characteristics of Magnetic Particles in Magnetophoretic Chip Microchannels." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18528.

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In this paper, a two-dimensional dynamic model describing the separation behaviors of magnetic particles in magnetophoretic chip microchannels integrated with double-side symmetric and asymmetric soft magnets is proposed and solved with the combining use of the finite element method and the fourth-order Runge-Kutta method. The dynamic characteristics of magnetic particles during the separation process, including the trajectories of magnetic particles, the capture time and capture efficiency are analyzed. The impacts of the geometrical configurations, fluid velocity and magnetic field intensity are also studied. The results show that the trajectories of the magnetic particles in microchannels are oscillatory because of the alternative magnetic force and this oscillation is more obvious for asymmetric positions of the soft magnets. The oscillatory motion of the particle leads to the increase of the moving distance and delay of the capture time. The capture time depends on the geometrical configurations, the initial positions and the dynamic characteristics of the particles. It is also found that under the same strength of magnetic fields there is nearly no difference on the capture efficiency for symmetric and asymmetric configurations. With the increase of fluid velocity, the capture efficiency drops drastically at low flow rates and decreases slowly at high flow rates. The distance between soft magnets and microchannel walls has the similar influence on capture efficiency. It is expected that the results presented in this paper are helpful for the design and optimization of magnetophoretic separation microsystems.
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Aziz, Mustafa, Reyah Abdula, and Mohamad Al-Dujaili. "High-Sensitivity, Portable Online Measurement of Defects and Anomalies in Coiled Tubing Strings." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207228-ms.

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Abstract A high-sensitivity, low-power and portable coiled-tubing (CT) inspection tool is developed based on magnetic flux leakage (MFL) technology. The tool provides enhanced real-time integrity monitoring of CT operations to minimize the risks of unexpected failures and enable efficient management of CT operations. This paper discusses practical design and engineering considerations to enhance the sensitivity of the magnetic inspection head, including magnetic characterization of the CT material, pole-piece separation, parametric calculations of the gap field, eddy currents, and MFL signal bandwidth. Experimental measurements illustrate the capability of detecting defects down to 1 mm in diameter and depth in a 1.5" CT pipe.
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Yao, Ming Hui, Wei Xia, Wei Zhang, and Jian Yu Jiao. "Nonlinear Dynamics of a Special Piezoelectric Energy Harvester With a Special Bistable Piezoelectric Cantilever Beam." In ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/smasis2018-7967.

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This paper presents a special piezoelectric energy harvester system which is obtained by separating the end of the upper piezoelectric layer of the traditional piezoelectric cantilever beam from its basic layer. A mass I is located at the end of the separated upper piezoelectric layer (SUPL), a mass II and a permanent magnet I are located at the end of the separated lower piezoelectric beam (SLPB) and a permanent magnet II is added in the opposite position of the permanent magnet I and they face each other with same polarities. A nonlinear magnetic force which can broaden the frequency bandwidth of the system is generated mutually on the two permanent magnets. Studies find that this special piezoelectric energy harvester has extremely high energy capture efficiency. In order to further explore the reason of high efficiency, experimental research on its dynamic behavior is carried out. The experimental results show that the vibrations of the SUPL and the SLPB are relatively simple. The dynamic behaviors of the SUPL, the SLPB and the unseparated part are different. The unseparated part of the piezoelectric shows relatively complex nonlinear phenomenon due to the interaction of nonlinear magnetic force and the collision. With the increase of the external excitation frequency, period doubling motion and almost periodic motion appear alternately.
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Rosario, Luis, and Muhammad M. Rahman. "Thermodynamic Analysis of a Magnetic Liquefier for Hydrogen." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82949.

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The aim of this paper is to present a thermodynamic analysis of a magnetic liquefier for hydrogen. A hydrogen liquefaction cycle is examined. A magnetic refrigerator, a liquid-nitrogen pre-cooling system, an expansion valve and a liquid-hydrogen separator integrate the system. The magnetic refrigerator consists of two heat exchangers and two stages of beds of magnetic materials. The analysis considered that the system operates with gaseous hydrogen entering at high pressure and ambient temperature. A fraction of this incoming flow is liquefied by the system. One magnetic material GdNi2 is used in the upper stage and another magnetic material GdPd is used in the lower stage. The heat transfer fluid for the magnetic refrigerator is helium. The beds in both stages are periodically magnetized and demagnetized and the fluid flows are arranged to meet the cycle liquefaction requirements. Sensitivity analysis has been performed to study the thermodynamic behavior of the magnetic liquefier cycle. Liquefaction efficiency, the nitrogen boil-off rate per unit mass of hydrogen, the fraction of the hydrogen gas that is liquefied and the magnetic refrigerator performance trends are evaluated. Simulations indicate that the higher the performance of the magnetic refrigerator is the higher the liquefaction efficiency of the system is with the same intermediate temperature. It was also observed that the liquefaction efficiency increases with the decrease in the nitrogen boil-off rate per unit mass of hydrogen. Magnetic liquefier exhibits a great potential by showing a very high efficiency when compared to small and large scale commercial liquefiers for hydrogen.
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Ashwathi, R. "Investigation on Strength Properties of Concrete using Steel Slag as a Partial Replacement for Fine Aggregate." In Sustainable Materials and Smart Practices. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901953-44.

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Abstract. The economic and ecological performance of normal concrete can be increased by modulating fine aggregate content with a series of combinations of steel slag which possess different physical and chemical behaviour based on its cooling method, heating processes. Many research shows that magnetic separating of steel slag increases its efficiency towards integrating with clinker by 50% compared to integrating of clinker with non-magnetically separated steel slag. It has proved to be an impressive replacement material in concrete surfaces where high skid resistance is essential. Steel slag produced in various types of furnaces have different characteristic nature, blast furnace slag (BFS) has hydraulic and cement properties when used in water-bound macadam roads and also in flexible and rigid pavements. Issue in steel slag is energy consumed in its production and transportation where it is utilized, if energy consumed in slag grinding/magnetic separation is high when compared to cement calcining and grinding, then it would not be economical in replacement criteria. This study exhibit mechanical properties of concrete with partial replacement of fine aggregate with steel slag in distinct proportions. The optimum amount of replacement in fine aggregate is found to be 20% giving a strength increment of 8% in the compressive strength category. In split tensile and flexural strength criteria strength increment of 7.5% and 40.625% is observed. There are many practical implications of steel slag in the construction industry, road constructions, and clinker substitutes as granulated BF slag, water treatment plants, evidently many researches have proved slag as productive coarse aggregates replacement.
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Deng, Feng, Shiwen Chen, Guanhong Chen, and Mengying Wang. "Intelligent Decision Making and Optimization of Artificial Lifting Based on MR Multi-Phase Flow Detection." In Offshore Technology Conference Asia. OTC, 2022. http://dx.doi.org/10.4043/31349-ms.

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Abstract Quantitative information regarding multi-phase flow of oil, gas and water in wells or pipelines are very important in guiding the artificial lifting parameters optimization and tool selection. At present, there is no reliable technology available which can accurately measure split flow of multi-phase fluids without separating oil, gas and water. So far, the multi-phase flow measurement technique commonly adopted globally is to carry out by phase separation after produced fluid entering the gathering station through the pipelines, where the content of each component is measured separately. The indirect measurement methods are usually with low-efficiency, high-cost and delay-delivery, and hard to reflect the real instantaneous fluid producing properties at wellheads or pipelines. Therefore, it is urgent to seek for accurate and reliable multi-phase flow detection devices and methods that can meet the monitoring demands for oil and gas resources. This paper proposed a nuclear magnetic resonance (NMR) device and analytical methods for detecting multi-phase fluid. At the same time, it puts forward the intelligent decision-making and optimization technology based on measurement, cloud computing and automatic control. As a green, efficient and accurate method for oil and gas detection, the NMR can realize online measurement for each component of multi-phase flow. Then based on the internet and large data analysis technology to achieve artificial lifting parameters optimization, while based on automatic control technology to achieve artificial lifting equipment negative feedback control. This progress helps to apply the NMR technique in petroleum industry to achieve green, efficient, real-time and low-cost multi-phase flow measurement. Combined with large data, Internet of Things (IOT) and automatic control technology to achieve intelligent artificial lifting technology and system.
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7

Yoon, Se Young, Zongli Lin, Wei Jiang, and Paul E. Allaire. "Flow-Rate Observers in the Suppression of Compressor Surge Using Active Magnetic Bearings." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-70011.

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Surge is a dynamic flow instability that can cause extensive damage to compressors and other components. One common challenge that many surge control methods in the literature face when implemented in industrial applications is the unavailability of the high performance actuators and accurate flow rate measurements that are required to suppress surge. In this paper we present experimental results of employing active magnetic bearings in order to suppress the surge instability in a centrifugal compressor. Also, we compare how the selection of the flow estimation method affects the effectiveness of the implemented surge suppression controller. Experimental data demonstrates that the best combination of controller and flow estimator tested in this work allows the compressor to operate deep into the former surge region when the controller is activated, moving the minimum flow rate at the surge initiation point by 21%. This allows the compression system to operate at the highest efficiency/pressure point in the characteristic curve, while still retaining a very conservative surge margin separating the allowed compressor operating region from the surge inception point even if unexpected system changes occur.
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Bahaj, A. S., P. A. B. James, and F. D. Moeschler. "Efficiency enhancements through the use of magnetic field gradients in orientation magnetic separation." In IEEE International Magnetics Conference. IEEE, 1999. http://dx.doi.org/10.1109/intmag.1999.837699.

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Hredzak, Slavomir. "HIGH GRADIENT MAGNETIC SEPARATION OF CALCINED MAGNESITE." In 14th SGEM GeoConference on SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING. Stef92 Technology, 2014. http://dx.doi.org/10.5593/sgem2014/b13/s4.111.

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Hicks, Richmond F., Wesley H. Halstead, and Thomas V. Gunn. "Diffractive color separation for high-efficiency LCDs." In AeroSense '97, edited by Darrel G. Hopper. SPIE, 1997. http://dx.doi.org/10.1117/12.276982.

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Reports on the topic "High efficiency magnetic separation"

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Boeder, A., and C. Zimm. Magnetic Refrigeration Technology for High Efficiency Air Conditioning. Office of Scientific and Technical Information (OSTI), September 2006. http://dx.doi.org/10.2172/915808.

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Appelhans, A. D., J. E. Olson, D. A. Dahl, and M. B. Ward. High efficiency noble gas electron impact ion source for isotope separation. Office of Scientific and Technical Information (OSTI), July 2016. http://dx.doi.org/10.2172/1364478.

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Daugherty, M. A., E. W. Roth, D. E. Daney, D. D. Hill, and F. C. Prenger. Ramp rate testing of an HTS high gradient magnetic separation magnet. Office of Scientific and Technical Information (OSTI), November 1997. http://dx.doi.org/10.2172/548734.

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4

Anderson, Iver, Emma White, and David Byrd. A High-Efficiency, Low Cost, High-Temperature Nanocomposite Soft Magnetic Materials for Vehicle Power Electronics. Office of Scientific and Technical Information (OSTI), February 2016. http://dx.doi.org/10.2172/1254495.

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Lahav, Ori, Albert Heber, and David Broday. Elimination of emissions of ammonia and hydrogen sulfide from confined animal and feeding operations (CAFO) using an adsorption/liquid-redox process with biological regeneration. United States Department of Agriculture, March 2008. http://dx.doi.org/10.32747/2008.7695589.bard.

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The project was originally aimed at investigating and developing new efficient methods for cost effective removal of ammonia (NH₃) and hydrogen sulfide (H₂S) from Concentrated Animal Feeding Operations (CAFO), in particular broiler and laying houses (NH₃) and hog houses (H₂S). In both cases, the principal idea was to design and operate a dedicated air collection system that would be used for the treatment of the gases, and that would work independently from the general ventilation system. The advantages envisaged: (1) if collected at a point close to the source of generation, pollutants would arrive at the treatment system at higher concentrations; (2) the air in the vicinity of the animals would be cleaner, a fact that would promote animal growth rates; and (3) collection efficiency would be improved and adverse environmental impact reduced. For practical reasons, the project was divided in two: one effort concentrated on NH₃₍g₎ removal from chicken houses and another on H₂S₍g₎ removal from hog houses. NH₃₍g₎ removal: a novel approach was developed to reduce ammonia emissions from CAFOs in general, and poultry houses in particular. Air sucked by the dedicated air capturing system from close to the litter was shown to have NH₃₍g₎ concentrations an order of magnitude higher than at the vents of the ventilation system. The NH₃₍g₎ rich waste air was conveyed to an acidic (0<pH<~5) bubble column reactor where NH₃ was converted to NH₄⁺. The reactor operated in batch mode, starting at pH 0 and was switched to a new acidic absorption solution just before NH₃₍g₎ breakthrough occurred, at pH ~5. Experiments with a wide range of NH₃₍g₎ concentrations showed that the absorption efficiency was practically 100% throughout the process as long as the face velocity was below 4 cm/s. The potential advantages of the method include high absorption efficiency, lower NH₃₍g₎ concentrations in the vicinity of the birds, generation of a valuable product and the separation between the ventilation and ammonia treatment systems. A small scale pilot operation conducted for 5 weeks in a broiler house showed the approach to be technically feasible. H₂S₍g₎ removal: The main goal of this part was to develop a specific treatment process for minimizing H₂S₍g₎ emissions from hog houses. The proposed process consists of three units: In the 1ˢᵗ H₂S₍g₎ is absorbed into an acidic (pH<2) ferric iron solution and oxidized by Fe(III) to S⁰ in a bubble column reactor. In parallel, Fe(III) is reduced to Fe(II). In the 2ⁿᵈ unit Fe(II) is bio-oxidized back to Fe(III) by Acidithiobacillus ferrooxidans (AF).In the 3ʳᵈ unit S⁰ is separated from solution in a gravity settler. The work focused on three sub-processes: the kinetics of H₂S absorption into a ferric solution at low pH, the kinetics of Fe²⁺ oxidation by AF and the factors that affect ferric iron precipitation (a main obstacle for a continuous operation of the process) under the operational conditions. H₂S removal efficiency was found higher at a higher Fe(III) concentration and also higher for higher H₂S₍g₎ concentrations and lower flow rates of the treated air. The rate limiting step of the H₂S reactive absorption was found to be the chemical reaction rather than the transition from gas to liquid phase. H₂S₍g₎ removal efficiency of >95% was recorded with Fe(III) concentration of 9 g/L using typical AFO air compositions. The 2ⁿᵈ part of the work focused on kinetics of Fe(II) oxidation by AF. A new lab technique was developed for determining the kinetic equation and kinetic parameters (KS, Kₚ and mₘₐₓ) for the bacteria. The 3ʳᵈ part focused on iron oxide precipitation under the operational conditions. It was found that at lower pH (1.5) jarosite accumulation is slower and that the performance of the AF at this pH was sufficient for successive operation of the proposed process at the H₂S fluxes predicted from AFOs. A laboratory-scale test was carried out at Purdue University on the use of the integrated system for simultaneous hydrogen sulfide removal from a H₂S bubble column filled with ferric sulfate solution and biological regeneration of ferric ions in a packed column immobilized with enriched AFbacteria. Results demonstrated the technical feasibility of the integrated system for H₂S removal and simultaneous biological regeneration of Fe(III) for potential continuous treatment of H₂S released from CAFO. NH₃ and H₂S gradient measurements at egg layer and swine barns were conducted in winter and summer at Purdue. Results showed high potential to concentrate NH₃ and H₂S in hog buildings, and NH₃ in layer houses. H₂S emissions from layer houses were too low for a significant gradient. An NH₃ capturing system was designed and tested in a 100-chicken broiler room. Five bell-type collecting devices were installed over the litter to collect NH₃ emissions. While the air extraction system moved only 10% of the total room ventilation airflow rate, the fraction of total ammonia removed was 18%, because of the higher concentration air taken from near the litter. The system demonstrated the potential to reduce emissions from broiler facilities and to concentrate the NH₃ effluent for use in an emission control system. In summary, the project laid a solid foundation for the implementation of both processes, and also resulted in a significant scientific contribution related to AF kinetic studies and ferrous analytical measurements.
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Johra, Hicham. Performance overview of caloric heat pumps: magnetocaloric, elastocaloric, electrocaloric and barocaloric systems. Department of the Built Environment, Aalborg University, January 2022. http://dx.doi.org/10.54337/aau467469997.

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Heat pumps are an excellent solution to supply heating and cooling for indoor space conditioning and domestic hot water production. Conventional heat pumps are typically electrically driven and operate with a vapour-compression thermodynamic cycle of refrigerant fluid to transfer heat from a cold source to a warmer sink. This mature technology is cost-effective and achieves appreciable coefficients of performance (COP). The heat pump market demand is driven up by the urge to improve the energy efficiency of building heating systems coupled with the increase of global cooling needs for air-conditioning. Unfortunately, the refrigerants used in current conventional heat pumps can have a large greenhouse or ozone-depletion effect. Alternative gaseous refrigerants have been identified but they present some issues regarding toxicity, flammability, explosivity, low energy efficiency or high cost. However, several non-vapour-compression heat pump technologies have been invented and could be promising alternatives to conventional systems, with potential for higher COP and without the aforementioned refrigerant drawbacks. Among those, the systems based on the so-called “caloric effects” of solid-state refrigerants are gaining large attention. These caloric effects are characterized by a phase transition varying entropy in the material, resulting in a large adiabatic temperature change. This phase transition is induced by a variation of a specific external field applied to the solid refrigerant. Therefore, the magnetocaloric, elastocaloric, electrocaloric and barocaloric effects are adiabatic temperature changes in specific materials when varying the magnetic field, uniaxial mechanical stress, electrical field or hydrostatic pressure, respectively. Heat pump cycle can be built from these caloric effects and several heating/cooling prototypes were developed and tested over the last few decades. Although not a mature technology yet, some of these caloric systems are well suited to become new efficient and sustainable solutions for indoor space conditioning and domestic hot water production. This technical report (and the paper to which this report is supplementary materials) aims to raise awareness in the building community about these innovative caloric systems. It sheds some light on the recent progress in that field and compares the performance of caloric systems with that of conventional vapour-compression heat pumps for building applications.
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