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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-Tâ†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 ScienceDepartment 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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Peca, Marco. "High-throughput skeletal stem cell separation using magnetic labelling and microfluidic sorting." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/382975/.
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Richards, Adrian John. "High gradient magnetic separation using ordered wire filters for the separation of human blood and bone marrow cells." Thesis, University of Southampton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390731.
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Bastos, Pedro David Anastácio de. "Separation of azeotropic mixtures using high ionicity ionic liquids." Master's thesis, Faculdade de Ciências e Tecnologia, 2014. http://hdl.handle.net/10362/12208.
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Low, Zhen Ning. "High efficiency loosely coupled wireless power transfer system via magnetic induction." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024707.
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Wang, Maisie S. "Ultra-high resolution imaging and artery-vein separation of blood pool contrast-enhanced MRA /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/8094.
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McGrail, Scott Alan. "Hollow Plume Mitigation of a High-Efficiency Multistage Plasma Thruster." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/1133.
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Since 2000, a relatively new electric thruster concept has been in research, development, and production at Thales Electron Devices in Germany. This High Efficiency Multistage Plasma Thruster, or HEMPT, has promising lifetime capabilities due to its plasma confinement system. However, the permanent magnet system that offers this and other benefits also creates a hollow plume, where ions are accelerated at angles rather than up the thruster centerline, causing a dip in ion current along the centerline. A laboratory model, built at JPL, was run at Cal Poly to characterize this plume shape and implement a shield to restore a conical shape to the plume. A similar solution was used on a different type of thruster, a cylindrical hall thruster, at Princeton with excellent results. A shield was designed to shunt the magnetic field outside the thruster, where the Princeton experiments have identified a radial magnetic field as the cause for this hollow plume. The thruster was run with and without the shield, taking measurements of the ion current in the plume using a linear probe drive. The shield fixed the plume shape, increasing centerline current by 48%, however it also had detrimental effects on thruster performance, causing a decrease in thrust, specific impulse, and cut the total efficiency in half. The shield design was reexamined and a new design has been suggested for future testing of the HEMPT to restore performance while still fixing the plume shape.
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Matsushima, Hisayoshi. "Iron Electrodeposition in High Magnetic Fields and Its Application to a New Electrochemical Deuterium Separation System." Kyoto University, 2004. http://hdl.handle.net/2433/147417.
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Kyoto University (京都大学)0048
新制・課程博士
博士(エネルギー科学)
甲第10971号
エネ博第82号
新制||エネ||24(附属図書館)
UT51-2004-G818
京都大学大学院エネルギー科学研究科エネルギー基礎科学専攻
(主査)教授 伊藤 靖彦, 教授 吉田 起國, 教授 足立 基齊
学位規則第4条第1項該当
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Sheikh, Abdi Mohamed, and Yosef Gebresilassie. "Consequences of Magnetic Properties in Stainless Steel for a High-efficiency Wave Power Generator." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-229479.
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A new kind of wave power generator is being developed at KTH Royal Institute of Technology which potentially can reach an efficiency of 98 %. However, this generator’s small air gap sets strict requirements on the stiffness of the structure to withstand the large magnetic forces. The structure, therefore, need to be both stiff and non-magnetic. To tackle that problem austenitic stainless steel will be used. Then again, austenitic stainless steel tends to become slightly magnetic because of impurities and mechanical stress. The purpose of this report is to study the magnetic properties of the austenitic stainless steel and observe how mechanical stress can change their properties. Moreover, economic and environmental aspects considering the use and production of the steel are studied. Two experiments were applied to measure the magnetic properties, using an LCR-meter and an electrical circuit with a current amplifier. Both methods showed that mechanical stress will result in changing the magnetic property of austenitic stainless steel. Some steel types were less affected by the mechanical stress applied leading to the conclusion that they are more effective when placed near the generator’s air gap. Regarding sustainable development, it is uncertain to determine the impact the generator has on the environment, mainly because of the steel types manufacturing process is unknown. On the contrary, the maintenance costs of the generator are predicted to be low and if the prototype fulfills the efficiency expectations it will have a huge impact on the future of wave power technology.En ny typ av vågkraftsgenerator utvecklas på KTH som potentiellt kan uppnå en verkningsgrad på 98%. Denna generators lilla luftgap ställer dock strikta krav på strukturens styvhet för att stå emot de stora magnetiska krafterna. Strukturen måste därför vara både styv och icke-magnetisk. För att ta itu med det problemet kommer austenitiskt rostfritt stål att användas. Sedan tenderar austenitiskt rostfritt stål att bli något magnetiskt på grund av föroreningar och mekanisk stress. Syftet med denna rapport är att studera austenitiskt rostfritt ståls magnetiska egenskaper och observera hur mekanisk stress kan förändra deras egenskaper. Dessutom studeras ekonomiska och miljömässiga aspekter som beaktar stålets användning och produktion. Två experiment utfördes för att mäta de magnetiska egenskaperna, med användning av en LCR-mätare och en elektrisk krets med en strömförstärkare. Båda metoderna visade att mekanisk stress kommer att leda till förändring av den magnetiska egenskapen hos austenitiskt rostfritt stål. Vissa ståltyper påverkades mindre av den mekaniska påfrestningen som ledde till slutsatsen att de är mer effektiva när de placeras nära generatorns luftgap. När det gäller hållbar utveckling är det osäkert att bestämma vilken påverkan generatorn har på miljön, främst på grund av att detrostfria stålets tillverkningsprocess är okänd. Tvärtom förmodas att underhållskostnaderna för generatorn komme vara låga och om prototypen uppfyller effektivitetsförväntningarna kommer det att ha en stor inverkan på framtiden för vågkrafttekniken.
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Barlog, Christopher M. "Divergent Plume Reduction of a High-Efficiency Multistage Plasma Thruster." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1530.
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High Efficiency Multistage Plasma Thrusters (HEMPTs) are a relatively new form of electric propulsion that show promise for use on a variety of missions and have several advantages over their older EP competitors. One such advantage is their long predicted lifetime and minimal wall erosion due to a unique periodic permanent magnet system. A laboratory HEMPT was built and donated by JPL for testing at Cal Poly. Previous work was done to characterize the performance of this thruster and it was found to exhibit a large plume divergence, resulting in decreased thrust and specific impulse. This thesis explores the design and application of a magnetic shield to modify the thruster’s magnetic field to force more ion current towards the centerline. A previous Cal Poly thesis explored the same concept, and that work is continued and furthered here. The previous thesis tested a shield which increased centerline current but decreased performance. A new shield design which should avoid this performance decrease is studied here.
Magnetic modelling of the thruster was performed using COMSOL. This model was verified using guassmeters to measure the field strength at many discrete points within and near the HEMPT, with a focus on the ionization channel and exit plane. A shield design which should significantly reduce the radial field strength at the exit plane without affecting the ionization channel field was modelled and implemented. The HEMPT was tested in a vacuum chamber with and without the shield to characterize any change to performance characteristics. Data were collected using a nude Faraday probe and retarding potential analyzer. The data show a significant increase in centerline current with the application of the shield, but due to RPA malfunction and thruster failure the actual change in performance could not be concluded.
The unshielded HEMPT was characterized, however, and was found to produce 12.1 +/- 1.3 mN of thrust with a specific impulse of 1361 +/- 147s. The thruster operated with a total efficiency of 10.63 +/- 3.66%, an efficiency much lower than expected. A large contributor to this low efficiency is likely the use of argon in place of xenon. Its lower mass and higher ionization energy make it a less efficient propellant choice. Further, the thruster is prone to overheating, indicating that significant thermal losses are present in this design.
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Hara, Takeshi [Verfasser]. "Study on preparation and characterization of monolithic silica capillary columns for high separation efficiency in high performance liquid chromatography / Takeshi Hara." Gießen : Universitätsbibliothek, 2013. http://d-nb.info/1064991351/34.
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Pang, Shu Koon. "Investigation of recombination lifetime and defects in magnetic czochralski silicon for high efficiency solar cells." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/13554.
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Liu, Daerhan. "Novel Strongly Coupled Magnetic Resonant Systems." FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3717.
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Wireless power transfer (WPT) technologies have become important for our everyday life. The most commonly used near-field WPT method is inductive coupling, which suffers from low efficiency and small range. The Strongly Coupled Magnetic Resonance (SCMR) method was developed recently, and it can be used to wirelessly transfer power with higher efficiency over a longer distance than the inductive coupling method.
This dissertation develops new SCMR systems that have better performance compared to standard SCMR systems. Specifically, two new 3-D SCMR systems are designed to improve the angular misalignment sensitivity of WPT systems. Their power transfer efficiency for different angular misalignment positions are studied and analyzed. Prototypes are built for both systems and their performance is validated through measurement. Furthermore, new planar broadband conformal SCMR (CSCMR) systems are developed that maintain high efficiency while providing significantly larger bandwidth than standard CSCMR systems. Such broadband CSCMR systems are used here for the first time to simultaneously accomplish highly efficient wireless power transfer and high data rate communication through the same wireless link. These systems that combine wireless power and communication are expected to enable next-generation applications with battery-less and “power-hungry” sensors. Example applications include implantable and wearable sensors as well as embedded sensors for structural health monitoring.
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Lu, Hong. "Development of Calcium-Based Durable Sorbents with High Carbon Dioxide Uptake Efficiency at High Temperatures." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1239116430.
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Noonan, Jeremy Shawn. "Experimental and Theoretical Evaluation of the Filtration Mechanisms for a Magnetic Separations Process." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6989.
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High-Gradient Magnetic Separation (HGMS) is a powerful separation process that has great potential for industrial wastewater treatment, particularly for the removal and recovery of paramagnetic colloidal particles. The chief advantages of HGMS are that the separation is reversible and potentially selective. However, these advantages are compromised if non-magnetic filtration mechanisms influence significantly the capture of particles. The objective of this study was to identify the chief mechanisms responsible for the removal of ferric oxide (Fe2O3) from water by an HGMS process. This objective was achieved by measuring the effects of applied magnetic induction, collector radius, and fluid velocity on the removal efficiency (RE) of a stainless-steel filter column. These factors were tested on the removal of bare Fe2O3 particles and particles treated with a surfactant (sodium dodecyl sulfate, SDS). The results were compared to the predictions of a trajectory model which simulates particle capture by a magnetic force. The experimental results show that non-magnetic force mechanisms are primarily responsible for the removal of bare Fe2O3 particles for the experimental conditions used in this work. For these particles, the three factors tested had no significant effect on the RE, and 90.1% of the particles were removed without a magnetic force. These results differed sharply from modeling predictions. However, the magnetic force mechanism is primarily responsible for the removal of surfactant-treated Fe2O3 particles. The three factors investigated had a marked effect on the RE, and only 10.8% of the particles were removed without a magnetic force. An increase in magnetic induction from 0.2 to 0.5 T increased the RE from 79.9 to 93.4 %; a decrease in wire radius from 49 to 15 Ym increased the RE from 60.2 to 93.4%, and a decrease in fluid velocity from 0.5 to 0.1 cm/s increased the RE from 69.5 to 95.3%. These results agreed closely with the model predictions.This study demonstrates that by reducing the effect of attractive non-magnetic forces on filtration, surfactant treatment of colloidal particles can potentially preserve and enhance these two key advantages, i.e., regeneration and selectivity of HGMS processes.
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Lu, Ming. "Synergetic Attenuation of Stray Magnetic Field in Inductive Power Transfer." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/78621.
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Significant stray magnetic field exists around the coils when charging the electric vehicles (EVs) with inductive power transfer (IPT), owning to the large air gap between the transmitter and receiver. The methods for field attenuation usually introduce extra losses and reduce the efficiency. This study focuses on the synergetic attenuation of stray magnetic field which is optimized simultaneously with the efficiency. The optimization is realized with Pareto front.
In this dissertation, three methods are discussed for the field attenuation. The first method is to tune the physical parameters of the winding, such as the inner radii, outer radii, distribution of the turns, and types of the litz wires. The second method is to add metal shields around the IPT coils, in which litz wires are used as shields to reduce the shielding losses. The third method is to control the phases of winding currents, which avoids increasing the size and weight of the IPT coils.
To attenuate the stray magnetic field by tuning the physical parameters, the conventional method is to sweep all the physical parameters in finite-element simulation. This takes thousands of simulations to derive the Pareto front, and it's especially time-consuming for three-dimensional simulations. This dissertation demonstrates a faster method to derive the Pareto front. The windings are replaced by the lumped loops. As long as the number of turns for each loop is known, the efficiency and magnetic field are calculated directly from the permeance matrices and current-to-field matrices. The sweep of physical parameters in finite-element simulation is replaced by the sweep of the turns numbers for the lumped loops in calculation. Only tens of simulations are required in the entire procedure, which are used to derive the matrices. An exemplary set of coils was built and tested. The efficiency from the matrix calculation is the same as the experimental measurement. The difference for stray magnetic field is less than 12.5%.
Metal shields attenuate the stray magnetic field effectively, but generates significant losses owning to the uneven distribution of shield currents. This dissertation uses litz wires to replace the conventional plate shield or ring shield. Skin effect is eliminated so the shield currents are uniformly distributed and the losses are reduced. The litz shields are categorized to two types: shorted litz shield and driven litz shield. Circuit models are derived to analyze their behaviors. The concept of lumped-loop model is applied to derive the Pareto front of efficiency versus stray magnetic field for the coils with litz shield. In an exemplary IPT system, coils without metal shield and with metal shields are optimized for the same efficiency. Both the simulation and experimental measurement verify that the shorted litz shield has the best performance. The stray magnetic field is attenuated by 65% compared to the coils without shield.
This dissertation also introduces the method to attenuate the stray magnetic field by controlling the phases of winding currents. The magnetic field around the coils is decomposed to the component in the axial direction and the component in the radial direction. The axial component decreases with smaller phase difference between windings' currents, while the radial component exhibits the opposite property. Because the axial component is dominant around the IPT coils, decreasing the phase difference is preferred. The dual-side-controlled converter is applied for the circuit realization. Bridges with active switches are used for both the inverter on the transmitter side and the rectifier on the receiver side. The effectiveness of this method was verified both in simulation and experiment. Compared to the conventional series-series IPT with 90° phase difference between winding currents, stray magnetic field was attenuated by up to 30% and 40% when the phase differences of winding currents are 50° and 40°, respectively.
Furthermore, an analytical method is investigated to calculate the proximity-effect resistance of the planar coils with ferrite plate. The objective of this method is to work together with the fast optimization which uses the lumped-loop model. The existence of the ferrite plate complicates the calculation of the magnetic field across each turn which is critical to derive the proximity-effect resistance. In this dissertation, the ferrite plate is replaced by the mirrored turns according to the method of image. The magnetic fields are then obtained from Ampere's Law and Biot-Savart Law. Up to 200 kHz, the difference of the proximity-effect resistance is less than 15% between calculation and measurement.Ph. D.
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Yang, Gang. "Design of a High Efficiency High Power Density DC/DC Converter for Low Voltage Power Supply in Electric and Hybrid Vehicles." Thesis, Supélec, 2014. http://www.theses.fr/2014SUPL0011/document.
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Cette thèse traite de la conception d’un convertisseur DC / DC destiné aux véhicules électriques et hybrides (2,5 kW, 400V/14V, 250kHz). Dérivé de la topologie LLC à résonance, ce convertisseur bénéficie des nombreux avantages propres à cette structure particulière. C’est ainsi que le prototype réalisé présente un rendement très élevé, une densité de puissance très forte avec des perturbations EMI très réduites. La première partie de cette thèse est consacrée à l’analyse théorique du circuit LLC afin de dégager un modèle de conversion et une stratégie de contrôle adaptée à l’application visée. Afin de conserver un rendement important sur une large plage de charge, une structure basée sur la mise en parallèle de deux modules LLC est proposée. Une nouvelle stratégie de contrôle à deux boucles est également proposée pour équilibrer le courant entre les deux modules. La seconde partie de la thèse fait appel à la simulation et à l’expérimentation. Il s’agit de minimiser la masse et l’encombrement tout en maximisant le rendement. Un composant magnétique spécial est conçu puis dimensionné pour intégrer le transformateur et diverses inductances de résonance. Ce convertisseur met également en œuvre un système de redressement synchrone robuste avec une compensation de phase, un module de puissance avec une résistance thermique très faible et un système de refroidissement efficace par air. Le rendement maximal mesuré est 95%. Le rendement demeure supérieur à 94% sur une plage de puissance s’étalant de 500 W à 2 kW. La densité de puissance est 1W/cm3. La CEM du convertisseur est développée dans cette thèseIn this dissertation, a 2.5kW 400V/14V, 250kHz DC/DC converter prototype is developed targeted for electric vehicle/hybrid vehicle applications. Benefiting from numerous advantages brought by LLC resonant topology, this converter is able to perform high efficiency, high power density and low EMI. A first part of this dissertation is the theoretical analysis of LLC: topology analysis, electrical parameter calculation and control strategy. To arrange high output current, this thesis proposes parallel connected LLC structure with developed novel double loop control to realize an equal current distribution. The second part concerns on the system amelioration and efficiency improvement of developed LLC. A special transformer is dimensioned to integrate all magnetic components, and various types of power losses are quantified based on different realization modes and winding geometries to improve its efficiency. This converter also implements a robust synchronous rectification system with phase compensation, a power semiconductor module, and an air-cooling system. The power conversion performance of this prototype is presented and the developed prototype has a peak efficiency of 95% and efficiency is higher than 94% from 500W to 2kW, with a power density of 1W/cm3. The CEM analysis of this converter is also developed in this thesis
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Rausch, Elisabeth [Verfasser]. "Thermoelectric performance of p-type TiCoSb half-Heusler compounds - Intrinsic phase separation and charge carrier concentration optimization as key to high efficiency / Elisabeth Rausch." Mainz : Universitätsbibliothek Mainz, 2015. http://d-nb.info/1075293375/34.
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Шуліка, Євгеній Олександрович. "Оцінка ефективності флокулянтів в процесах очищення зворотної води." Master's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/30710.
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Магістерська дисертація: стр.59, табл. 11, рис. 11, 88 першоджерел.
Мета роботи: оцінка ефективності застосування катіонних та неіоногенних флокулянтів для освітлення стічних вод з високою каламутністю.
Об’єкт дослідження: інтенсифікація процесів очищення стічних вод.
Предмет дослідження: освітлення зворотної води гірничо-збагачувальних виробництв з допомогою флокулянтів
В роботі представлено результати досліджень флокуляційної очистки водних суспензій, з вихідною каламутністю на рівні 5-7 г/дм3.
Досліджено основні фізико-хімічні характеристики вихідної води, які впливають на технологічні властивості флокулянтів: природа та гідравлічна крупність завислих речовин, їх концентрація, електрокінетичний потенціал, виконано розширений аналіз води за різними показниками.Master's Thesis: p. 59, Table 11, fig.11, 88 primary sources. Purpose: to evaluate the efficiency of the use of cationic and nonionic flocculants for high-turbidity sewage treatment. Object of study: intensification of wastewater treatment processes. Subject of research: backwater illumination of mining and processing industries with the help of flocculants The results of studies of flocculation purification of aqueous suspensions with initial turbidity at 5-7 g / dm3 are presented in the paper. The basic physicochemical characteristics of the source water that influence the technological properties of flocculants are investigated: nature and hydraulic size of the suspended substances, their concentration, electrokinetic potential, advanced analysis of water according to various parameters is performed.
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Preusse, Franziska. "High fluid intelligence and analogical reasoning." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2011. http://dx.doi.org/10.18452/16424.
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Hitherto, previous studies on the cerebral correlates of fluid intelligence (fluIQ) used tasks that did not exclusively demand fluIQ, or were restricted to participants of average fluIQ (ave-fluIQ) solving intelligence test items of varying difficulty, thus not allowing assumptions on interindividual differences in fluIQ. Geometric analogical reasoning (GAR) demands fluIQ very purely and thus is an eligible approach for research on interindividual differences in fluIQ. In a first study, we examined the cerebral correlates of GAR, and showed the involvement of parietal and frontal brain regions. This is in line with the assumptions of the parieto-frontal integration theory (P-FIT) of intelligence and with literature reports for other visuo-spatial tasks. Building upon these findings, we report results from a second study with high fluIQ (hi-fluIQ) and ave-fluIQ school students solving a GAR task. Again in line with the P-FIT model, we demonstrated that the parieto-frontal network is involved in GAR in both groups. However, the extent of task-related brain activation in parietal and frontal brain regions was differentially modulated by fluIQ. Our results thus partly run counter to the postulates of the neural efficiency hypothesis, which assumes a negative brain activation-intelligence relationship. We conclude that this relationship is not generally unitary; rather, it can be conjectured that the adaptive and flexible modulation of brain activation is characteristic of hi-fluIQ. Knowledge on the stability of the cerebral correlates of hi-fluIQ during adolescence had been sparse. To elucidate this field, we examined the follow-up stability of the cerebral correlates of GAR in hi-fluIQ in a third study. We demonstrated that the relevant brain network is in place already at age 17 and that improvements in behavioral performance at age 18 due to task familiarity are indicative of more efficient use of the cerebral resources available.Bisherige Studien zu zerebralen Korrelaten fluider Intelligenz (fluIQ) haben Aufgaben verwendet, die fluIQ nicht in Reinform erfordern oder haben Probanden mit durchschnittlicher fluIQ (ave-fluIQ) beim Lösen von Intelligenztestaufgaben mit variierenden Schwierigkeitsstufen untersucht und ermöglichen daher keine Aussagen zu interindividuellen Unterschieden in fluIQ. Geometrisches analoges Schließen (GA) beansprucht fluIQ in Reinform und eignet sich daher als differentielles Untersuchungsparadigma. In einer ersten Studie haben wir die zerebralen Korrelate des GA untersucht und nachgewiesen, dass parietale und frontale Hirnregionen involviert sind. Dies steht im Einklang mit der parieto-frontalen Integrationstheorie (P-FIT) der Intelligenz und mit Literaturberichten zu anderen visuell-räumlichen Aufgaben. Aufbauend auf diesen Befunden berichten wir Ergebnisse einer zweiten Studie, in der Schüler mit hoher fluIQ (hi-fluIQ) und ave-fluIQ GA-Aufgaben lösten. In Übereinstimmung mit den Annahmen des P-FIT-Modells konnten wir zeigen, dass GA in beiden Gruppen das parieto-frontale Netzwerk beansprucht. Das Ausmaß der Hirnaktivierung wurde jedoch differentiell durch fluIQ moduliert. Unsere Ergebnisse widersprechen damit teilweise den Postulaten der neuralen Effizienztheorie, die einen negativen Zusammenhang zwischen Hirnaktivierung und Intelligenz annimmt. Wir schlussfolgern, dass dieser Zusammenhang nicht generell einseitig gerichtet ist, sondern die flexible Modulation von Hirnaktivierung charakteristisch für hi-fluIQ ist. Befunde zur Stabilität zerebraler Korrelate von hi-fluIQ in der Jugend waren bisher rar. Um dieses Feld zu beleuchten, haben wir die follow-up-Stabilität zerebraler Korrelate des GA in der hi-fluIQ Gruppe in einer dritten Studie untersucht. Wir konnten zeigen, dass das relevante zerebrale Netzwerk schon mit 17 Jahren etabliert ist und Performanzverbesserungen über die Zeit für eine effizientere Nutzung der verfügbaren zerebralen Ressourcen sprechen.
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Vaňásek, Jakub. "Imunomagnetická separace buněk bakterií mléčného kvašení pomocí magnetických nosičů funkcionalizovaných protilátkou." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2015. http://www.nusl.cz/ntk/nusl-217122.
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Immunomagnetic separation is based on binding of antibody with antigen, where antibody is bound to magnetic particle. In this thesis there were used particles of magnetic pearl cellulose with antiLactobacillus and antiBifidobacterium antibodies. Immunomagnetic separation method was optimalized and verified for its efficiency and specifity with bacterial and yeast cells. This cells were identified by polymerase chain reaction. Efficiency of immunomagnetic separation was verified on probiotic meat product, where Lactobacillus cells were isolated. With DNA from isolated Lactobacillus cells the high resolution melting was performed. The results show presence of several bacterial strains of Lactobacillus species.
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Lopez, Samuel. "Définition de nouvelles structures de circuits magnétiques de machines AC utilisant des tôles à grains orientés." Thesis, Artois, 2011. http://www.theses.fr/2011ARTO0202/document.
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Le travail présenté porte sur la définition et le développement d’un circuit magnétique pour moteurs à haut rendement de faible et moyenne puissances. Il est réalisé avec des tôles à Grains Orientés (GO) non-segmentées. Des expérimentations réalisées en champ unidirectionnel, destinées à comparer les caractéristiques globales de la structure GO à celles obtenues sur un assemblage classique composé de tôles à grains Non-Orientés (NO), permettent de conclure quant à l’efficacité de l’association proposée en termes de pertes fer. Des investigations au niveau local, accompagnées d’une modélisation numérique, conduisent à une analyse de la répartition interne du flux magnétique dans la structure, permettant de l’optimiser. Cette technique d’assemblage est ensuite testée en champ tournant sur des moteurs statiques. Les performances obtenues, sont de nouveau comparées à celles relevées sur une maquette NO. L’étape finale consiste à tester le principe développé sur des moteurs à induction réalisés avec la configuration GO. Diverses caractéristiques sont relevées ou estimées (norme CEI) et comparées à celles de la machine NO d’origine. L’efficacité de la structure GOse traduit par une réduction notable des pertes fer, notamment statiques, conduisant à accroître sensiblement le rendement global de la machineThe work presented is focused on the design and development of a magnetic circuit for high efficiency motors of medium and small powers. It is built with non-segmented laminations of Grain Oriented (GO) steel. Experimentations on magnetic circuits excited under unidirectional magnetic field are performed. Such tests aim the comparison of the GO structure global characteristics with those of a classic one composed of Non-Oriented (NO) steel, allowing seeing the superiority of the GO structure in terms of iron losses. Local experimentations, followed by a numerical model, allow the analysis of the local distribution of the magnetic flux within the structure, leading to its optimisation. Such technique of assembly is then tested under rotational magnetic field. In that context, several experimentations are performed and its performance is compared with the one of a NO prototype. The final stage consists in testing the developed structure in induction motors built withthis GO assembly. Several characteristics are measured or estimated (IEC standard) and compared with those obtained on the initial NO motor. The GO structure efficiency leads to a remarkable reduction of the static losses, allowing the increase of the global efficiency of the motor
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Nava, Eric. "Modèle de piégeage de particules ultrafines sous champ magnétique intense : application à l'épuration de fluide." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL120N.
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Ce mémoire a pour objet la modélisation d'un séparateur magnétique à haut gradient de champ H. G. M. S. C'est un dispositif technique utilisé pour extraire des particules paramagnétiques de tailles microscopiques d'un fluide ou d'un gaz. Le principe de base du séparateur est la capture de particules magnétiques sur des fils ferromagnétiques. Nous avons développé des modèles théoriques pour étudier la capture de particules sur des réseaux réguliers de fils. Ces modèles nous ont permis de mettre en évidence un phénomène d'effet canal dans le séparateur. Des essais ont été effectués afin d'obtenir la distribution spatiale des particules piégées dans une matrice grille. À partir des expériences réalisées et des modèles théoriques nous avons établi et expliqué le processus de capture de particules à l'intérieur d'une matrice. Nous proposons également de nouvelles structures de matrices pour améliorer l'efficacité des séparateurs magnétiques
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Bořil, Michal. "Návrh vysokootáčkového synchronního stroje s permanentními magnety o výkonu 3 MW." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413037.
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The thesis theme is the design of 3 MW high-speed permanent magnet synchronous motor. The work is divided into several parts, and contains the information given on the topic. The first part lists trends and new technologies of high-speed electric machines, and the issues and construction of high-speed synchronous machines are also listed here. In the second part, the machine is analytically designed from the specified values, which is then modelled in the RMxprt program. In the penultimate part, the engine is simulated by programs that are included in the ANSYS Electronics Desktop package, they are RMxprt and Maxwell. The modified engine model in RMxprt is simulated using defined formulas and then converted to Maxwell 2D, where the engine is simulated using the finite element method. In the last part, the results from the analytical calculation are compared with other high-speed machines. In addition, the results of simulations from RMxprt and Maxwell were compared in the last part.
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Tu, Cheng-Wen, and 涂政雯. "Application of High Gradient Magnetic Separation for Recovery of Magnetic Micro-nano Particles." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/41396866748695148325.
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碩士國立臺灣大學
環境工程學研究所
99
This study investigated the recovery of magnetic micro-nano particles using high-gradient magnetic separator (HGMS). The major system parameters examined, include: inlet concentration of magnetic particles (MP) in the solution (CLF,i), volumetric flow rate (QL), magnetic field gradient (▽H), particle size (dp) and other parameters, such as packing density of magnetic media filled in the magnetic separation chamber (ρF). The separation efficiency(ηM), effective separation time (tB) and saturation time of separation chamber by the system parameters were evaluate. The mainly target particles studied were superparamagnetic particles of SM (SiO2/Fe3O4). For exploring the effects of particle size ,the magnetic Fe3O4 particles with sizes of 5-20,20-30 and 40-60 nm were employed. The magnetic SM particles were prepared using the sol-gel method, yielding the saturation magnetization of 23.19 emu g-1and particle size of 70-80 nm. The results indicate that a lower QL offers a longer tB and a better ηM for the HGMS. Also, a lower CLF,i of MP allows a large capture radius of magnetic media (rCF), resulting in a longer and a better ηM.The magnetic separation chamber filled with the magnetic media with a high ρF, provides higher magnetic field strength H and magnetic field gradient ▽H for the external magnetic field, and thus a higher ηM. Further, the capture of magnetic particles size with larger tends to reach saturation more easily. Therefore, the limitation of particle size should be considered for the capture of MP using HGMS. The multi-wire dynamic model was employed to simulate the performances of HGMS. Comparisons of experimental data and prediction indicate satisfactory agreement. The model can be used to predict the tB, optimum QL and other operating parameters, as well as the breakthrough curves. The results illustrate that the saturated magnetic matrix capacity of separation chamber is inversely proportional to the QL and CLF,i, however, is proportional to the magnetic field gradient. In practice, the model can be applied to simulate the real plant operation. The results may be used for the proper control of switching the magnetic field, thus avoiding the excessive loss of magnetic particles, and the secondary pollution to the environment.
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Chan, Fu-Chan, and 詹富全. "Magnetic Nanocomposite Material for High Efficiency Protein Purification." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/84072031802592876517.
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碩士國立交通大學
應用化學系分子科學碩博士班
99
This dissertation is concern about how to synthesis a recyclable magnetic nanocomposite which is decorated by NiO nanoparticles for the purification of His-tagged protein. First, the non-modified Fe3O4 is synthesized via a co-precipitation method. Then the non-modified nanoparticles are coated with densly silica shell by a sol-gel reaction of tetraethylorthosilicate (TEOS). Next step, we employ the same sol-gel reaction to create a mesoporous shell by adding TEOS and OTMS (octadecyltrimethoxysilane) simultaneously. The nanocomposites are calcined at 500℃ to generate mesoporous by removing the long chain part of OTMS.Then we synthesize NiO nanoparticle in the mesoporous shell. Finally, by using FTIR、SEM、TEM and SQUID to detect the nanocomposites. Then we choose procalcitonin and α-fucosidase as candidates for His-tagged purification process. After optimizing the purification process by changing the imidazole concentration or NaCl concentration we can set up a purification system successfully. By comparing our purification result with other commercial magnetic beads, we can realize that the efficiency of our beads is better than commercial ones either in purity nor recyclable use of purification.
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Chen, Po-Chou, and 陳柏洲. "Design and fabrication of high efficiency color-separation backlight system." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/30507179885745196965.
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Wu, Wan-I., and 吳萬益. "Copper Recovery from Water by High Gradient Magnetic Separation System." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/98750198816528807039.
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博士國立臺灣大學
環境工程學研究所
99
Abstract Copper plays an important role in human history since ancient times. In recent years, with the ever-changing optical industry and the rise of emerging countries, and the raising of living standards, copper consumption rate are increasing significantly. According to experts in the field,it is possible that copper resources would be exhausted within 30 years,The current problems are not only the lack of copper resources, but also the frequent inappropriate treatment of industrial wastewater that lead to copper pollution of the surface water supply. In response to the environmental impact,an environment-friendly recycle system should be established in order to address the issue of energywaste and secondary pollution problems caused by the current use of chemical coagulation and sedimentation processes or electroplating and aluminum replacement processes. Copper recovery from water by high gradient magnetic separation system (HGMS) was investigated in this study.High concentration of copper waste effluents was reduced by the reduction agent(Na2S2O3)to zero-valent copper with diameter ranged 0.4 to 20 micrometer, Paramagnetic substance(MnCl2) was added to increase the magnetic susceptibility the solution.Then high magnetic susceptibility metal (Permalloy) was added into the reaction tank as wire mesh (Matrix), and high external magnetic field (1000 Gauss = 1 Tesla) was applied to the reactor in order to drive copper particles within the solution to flow through the high magnetic susceptibility matrix and resulted in a high magnetic gradient on the Matrix surface. At the same time, magnetic flocculation was observed around the metal mesh that suspended and aggregated copper particles closely attached together to achieve the copper separation. Magnetic flocculated suspended metal aggregation was stable and uniformly distributed in the solution, and not only consists of magnetic attraction ability but also could act as a filtration so that the reaction would not be limited to the surface area of metal mesh and larger capacity could be handled. At the meantime, filtration could enhance particles collision and interception to elevate the recovery rate. High gradient magnetic separation (HGMS) is seen as a viable method. We tested the capture of valence copper from aqueous cupric ion by HGMS in combination with a reduction process. When a cupric solution (3.9 or 16 mM) was exposed to excess of dithionite (mole ratio of 1:3) in the presence of ammonia (mole ratio of 4) and amended with MnCl2 (2.5 g/L) and the mixture passed through a flow reactor under a high magnetic field (1 T), We have demonstrated the captured of valence copper in the reactor with well over 95% yields. The chemical reduction reactions were unaffected by the presence of MnCl2 while the amount of MnCl2 (0, 20 and 32 mM) has significantly varied the copper recovery efficiency especially in the case of high initial cupric ion concentration (16 mM). Formation of MnO2 flocs was found to have detrimental effect on copper removal efficiency. The HGMS method offers a tool of resource recovery for copper from waste effluents. Sizes of the captured particulate were predominantly of 4-20 μm in diameter, with Cu2O and CuO present among the solids. Four treatment configurations with and without the uses of magnetic field and metal alloy as matrix net were tested and their effects evaluated. At flow rates of 40, 60, 80, and 100 cm3/min , capture efficiencies for metallic copper in the absence of magnetic field were 87%, 86%, 63%, and 39%, respectively, and demonstrated an enhance mat to 99%, 98%, 95%, and 93%, respectively in the presence of msgnetic field. HGMS was critical to high capture efficiency, while a matrix net marginally enhanced it. Additional tests with a larger reactor confirmed similarly high efficiencies of > 85%. The use of alloy matrix appeared important when high flow rates would most likely be employed in practical applications.
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Eldeeb, Sami Kamal Hamed. "High efficiency separation techniques: fast HPLC using monolithic silica columns and chiral separation using capillary zone electrophoresis /." 2007. http://www.gbv.de/dms/bs/toc/533023092.pdf.
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Syu, Han-Jie, and 許瀚介. "A feasibility study of high gradient magnetic field separation for heavy metal." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/00465218338680947315.
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碩士國立臺灣海洋大學
電機工程學系
96
In this dissertation we explore the possibility of using the technique of High Gradient Magnetic Separation (HGMS) to extract heavy metal from wastewater. We will also discuss some of the forces such as magnetic force, gravitational force, and liquid resistance force that may affect the applicability of the HGMS. When the strength of the magnetic force is greater than that of the gravitational and the liquid resistance force, the extraction of heavy metal particles from the wastewater may be realized. The focus of this research is to on diamagnetic heavy metal. The magnetization strength of diamagnetic material is normally weak and therefore it is very difficult to cause these diamagnetic particles to adhere to the magnetic materials using the usual magnetization field. From the existing literature search, the utilization of high gradient field may overcome the inherent weak magnetization strength of the diamagnetic particles and achieve an effective removal of the heavy metal from wastewater. In this work, we study the effectiveness of two high mumetal materials, namely, ferromagnetic stainless steel wool and the PB type of high permeability permalloy quality material, as the matrix to achieve a high gradient field effect through the external magnetic field generated by a set of quadruple magnets. The magnetization process of the magnetic materials for the matrix will be performed and the results are represented as the hysteresis curves. The process was done to achieve the optimal high gradient field effect for the HGMS. The designed HGMS system will be experimented to study the feasibility of capturing diamagnetic heavy metal particles onto the matrix and hence achieved removal from the wastewater. The different sizes of the diamagnetic particles that can adhere to the matrix will be monitored through SEM (scanning electron microscope) observation. The relevant experimental parameters considered included magnitude of the magnetic field, the flow speed of wastewater, the response time, and the density of heavy metal.
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Dhadge, Vijaykumar Laxman. "Magnetic purification of antibodies." Doctoral thesis, 2016. http://hdl.handle.net/10362/19003.
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This work aimed at the development of magnetic nanoparticles for antibody purification and at the evaluation of their performance in Magnetic fishing and in a newly developed hybrid technology Magnetic Aqueous Two Phase Systems. Magnetic materials were produced by coprecipitation and solvothermal approaches. Natural polymers such as dextran, extracellular polysaccharide and gum Arabic were employed for coating of iron oxide magnetic supports. Polymer coated magnetic supports were then modified with synthetic antibody specific ligands,namely boronic acid, a triazine ligand (named 22/8) and an Ugi ligand (named A2C7I1). To optimize the efficacy of magnetic nanoparticles for antibody magnetic fishing, various solutions of pure and crude antibody solutions along with BSA as a non-specific binding protein were tested. The selectivity of magnetic nanoparticle for antibody, IgG, was found effective with boronic acid and ligand 22/8. Magnetic supports were then studied for their performance in high gradient magnetic separator for effective separation capability as well as higher volume handling capability.
The magnetic materials were also supplemented to aqueous two phase systems, devising a new purification technology. For this purpose, magnetic particles modified with boronic acid were more effective. This alternative strategy reduced the time of operation,maximized separation capability (yield and purity), while reducing the amount of salt required.
Boronic acid coated magnetic particles bound 170 ± 10 mg hIgG/g MP and eluted 160 ± 5 mg hIgG/g MP, while binding only 15 ± 5 mg BSA/g MP. The affinity constant for the interaction between hIgG and APBA_MP was estimated as 4.9 × 105 M-1 (Ka) with a theoretical maximum capacity of 492 mg hIgG adsorbed/g MP (Qmax). APBA_MPs were also tested for antibody purification directly from CHO cell supernatants. The particles were able to bind 98% of IgG loaded and to recover 95% of pure IgG (purity greater than 98%) at extremely mild conditions.
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Eldeeb, Sami [Verfasser]. "High efficiency separation techniques : fast HPLC using monolithic silica columns and chiral separation using capillary zone electrophoresis / von Sami Kamal Hamed Eldeeb." 2007. http://d-nb.info/984840400/34.
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Jen, Kao Wei, and 高偉仁. "Study and Implementation of Magnetic Integration-Based DC/DC Converter with High Efficiency and High Power Density." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/5xqax6.
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碩士國立交通大學
電機與控制工程系所
92
High power applications concerning power supply systems trends to implement the converters with high efficiency and high power density. Among the circuits used in slight high a power level, the popular circuits are known as phase-shift full-bridge converters and active-clamp forward converters. However, the complication of the topology and the switching loss are the drawbacks. To solve the problems above and approach the objectives of high efficiency and power density, we propose a technology of magnetic integration to combine the primary boost inductance and output inductance into a same core, thus reduce the overall volume and weight. We have also analyzed and implemented a magnetic integration-based DC/DC converter with smaller size and higher efficient. The proposed concept will be verified on a DC/DC converter with 48V, 500W output and wide range of input voltage from 150V to 300V. Further, this technology could be applied to medially high power design such as telecom power supply.
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YANG, HONG-CHI, and 楊宏騏. "High Efficiency Separation of Valuable Metals from Spent Lithium-ion Battery by Solvent Extraction Synergized Complexation." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/5cx6ac.
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Zhang, Jun-Sheng, and 張峻昇. "The Study of High Efficiency Extraction and Separation of Cobalt(II) Ions and Nickel(II) Ions in Solution." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/vq5mzr.
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碩士朝陽科技大學
環境工程與管理系
105
Annual demand for lithium-ion batteries for usage of electronic products, hybrid electric vehicles, large storage batteries, electric motorcycles is increasing due to advancements in science and technology. However, this causes a problem of waste batteries recycling. The battery recycling plants in Taiwan at present only reclaim manganese batteries and alkaline zinc-manganese dioxide batteries, while most lithium-ion batteries are recycled abroad. If high concentrations of precious metals from waste lithium-ion batteries can be extracted, not only environmental hazards can be reduced but industrial manufacturing costs can be cut as well, which is favorable in solving the problem of waste lithium-ion batteries. This research mainly discusses the separation of cobalt (II) and nickel (II) ions from lithium-ion batteries following recycling of manganese. Cobalt (II) and Nickel (II) ions can be bonded with thiocyanate (SCN-) ions in NH4SCN solution to form Co(SCN)42- and Ni(SCN)42- complexes. Subsequently, cobalt (II) ions are extracted by acidic P507 extractant to form P507-Co and then sulfuric acid is used for further extraction and recovery of cobalt ions. The optimum operating parameters were as follows: P507 as extractant, saponification ratio of 60%, n-heptane as diluent, molar ratio range of cobalt-nickel at 1:3-3:2, molar ratio of extractant to cobalt-ion at 4:1, molarity of NH4SCN at 0.7M, volumetric ratio of oil-water at 1:1 and temperature control at 50℃. The final cobalt extraction rate was larger than 93.52% while the nickel extraction rate was only 2.05%, whereas the separation coefficient was 704. Keywords: Cobalt, Nickel, Thiocyanate, Complexion, Solvent Extraction.
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Li, Chien Ting, and 李建廷. "Application of optically induced dielectrophoretic (ODEP) force-based microfluidic platform for label-free and high-efficiency live and dead cell separation." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/14801371201494513059.
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碩士長庚大學
生化與生醫工程研究所
102
This study reports an optically induced dielectrophoretic (ODEP)force-based microfluidic platform for the separation and collection live and dead cells. The mechanism is based on the fact that live and dead cells have reverse property in under ODEP force field. Under an ODEP background, the live cells are attracted by the applied ODEP force,whereas the dead cells are repelled from the ODEP force. Combining above phenomenon and the flow control in a microfluidic system, the live and dead cells can be separated and subsequently collected in a label-free, efficient and effective manner. In this study, the operating conditions of ODEP force for manipulating the live and dead chondrocytes were first characterized. The performance of live and dead separation was experimentally evaluated. In addition, the impact of ODEP force field on the physiology of the cells manipulated was also investigated. Our results revealed that the applied voltage of 8Vp-p was suitable for the cell separation due to the maximum difference of manipulation force for the live (49.4 pN) and dead (-20.1 pN) cells. In addition, the use of the proposed scheme for live and dead cell separation was successfully demonstrated. We also showed that the recovery rate and purity of the isolated live cells are as high as 78.3±6.8% and 96.4 ±2.2%, respectively. In addition, the purified and isolated live chondrocytes were cultured and observed growth and physiology for eight days. Comparing to electrical unstimulated chondrocytes, experimental cells had no significant difference in cell growth, proliferation and morphology. Also, experimental group and control group have no significant difference in metabolic analysis of lactic acid production and DNA content analysis. In a sum, the proposed cell separation method is found particularly valuable for the biological researches in which the isolation of highly pure live or dead cells is important.
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Chen, Hao-Lin, and 陳豪麟. "The Preparation of Magnetic Bamboo Charcoal as a Template for High-efficiency Cytoflow-bioreactor Base Cell Sorter(HCBCS): Monoclonal Antibody Production." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/18454967699427376752.
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碩士國立臺灣大學
醫學工程學研究所
99
George Kohler and Cesar Milstein employed fusion theory to produce monoclonal antibody in 1975. Monoclonal antibodies (mAbs) have been proven useful in research and clinical applications. However, the generation of mAbs by conventional hybridoma technology is time-, cost- and labor-consuming. Before, a siphon bioreactor and the carrier(bamboo charcoal) combined as a cell sorter called : Cytoflow-bioreactor base cell sorter(CBCS). Our design allows the production of mAbs while avoiding time-consuming steps, such as large numbers of limiting dilutions and screening assays, and demonstrates that the CBCS could be a powerful tool for monoclonal antibody production. But the CBCS still had some problems : the particle size of carrier is limited、non-specific binding、low-efficiency cell sorting and operational difficulties. The purpose of study is improving cytoflow-bioreactor base cell sorter, promote cell sorting efficiency, avoid the possibility of non-specific binding and operational difficulties, create a high-efficiency cytoflow-bioreactor base cell sorter(HCBCS) could be employed to harvest antibody-secreting B cells from the peripheral blood without sacrificing the animal. In the future, we hope this method not only produce animals monoclonal antibody but also produce humanized monoclonal antibody, to achieve the purpose of monoclonal antibody mass production.
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Ottinger, Annette [Verfasser]. "High gradient magnetic separation (HGMS) of erythrocytes infected with plasmodium falciparum = Hochgradienten-Magnetseparation (HGMS) von Plasmodium-falciparum-infizierten Erythrozyten / vorgelegt von Annette Ottinger geb. Hartmann." 2009. http://d-nb.info/1011494604/34.
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Bracchi, Alberto. "Structural and Magnetic Properties of the Glass-Forming Alloy Nd60Fe30Al10." Doctoral thesis, 2004. http://hdl.handle.net/11858/00-1735-0000-000D-F262-0.
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