subject:(magnetic actuation)

University of Waterloo

1. Mehrtash, Moein. Bilateral Macro-Micro Teleoperation Using A Magnetic Actuation Mechanism.

Degree: 2013, University of Waterloo

► In recent years, there has been increasing interest in the advancement of microrobotic systems in micro-engineering, micro-fabrication, biological research and biomedical applications. Untethered magnetic-based microrobotic… (more)

▼ In recent years, there has been increasing interest in the advancement of microrobotic systems in micro-engineering, micro-fabrication, biological research and biomedical applications. Untethered magnetic-based microrobotic systems are one of the most widely developing groups of microrobotic systems that have been extensively explored for biological and biomedical micro-manipulations. These systems show promise in resolving problems related to on-board power supply limitations as well as mechanical contact sealing and lubrication. In this thesis, a high precision magnetic untethered microrobotic system is demonstrated for micro-handling tasks. A key aspect of the proposed platform concerns the integration of magnetic levitation technology and bilateral macro-micro teleoperation for human intervention to avoid imperceptible failures in poorly observed micro-domain environments. The developed platform has three basic subsystems: a magnetic untethered microrobotic system (MUMS), a haptic device, and a scaled bilateral teleoperation system. The MUMS produces and regulates a magnetic field for non-contact propelling of a microrobot. In order to achieve a controlled motion of the magnetically levitated microrobot, a mathematical force model of the magnetic propulsion mechanism is developed and used to design various control systems. In the workspace of 30 × 32 × 32 mm ³, both PID and LQG\LTR controllers perform similarly the position accuracy of 10 µ m in a vertical direction and 2 µ m in a horizontal motion. The MUMS is equipped with an eddy-current damper to enhance its inherent damping factor in the microrobot's horizontal motions. This paper deals with the modeling and analysis of an eddy-current damper that is formed by a conductive plate placed below the levitated microrobot to overcome inherent dynamical vibrations and improve motion precision. The modeling of eddy-current distribution in the conductive plate is investigated by solving the diffusion equation for vector magnetic potential, and an analytical expression for the horizontal damping force is presented and experimentally validated. It is demonstrated that eddy-current damping is a crucial technique for increasing the damping coefficient in a non-contact way and for improving levitation performance. The damping can be widely used in applications of magnetic actuation systems in micro-manipulation and micro-fabrication. To determine the position of the microrobot in a workspace, the MUMS uses high-accuracy laser sensors. However, laser positioning techniques can only be used in highly transparent environments. A novel technique based on real-time magnetic flux measurement has been proposed for the position estimation of the microrobot in case of laser beam blockage, whereby a combination of Hall-effect sensors is employed to find the microrobot's position in free motion by using the produced magnetic flux. In free motion, the microrobot tends to move toward the horizontally zero magnetic field gradient, B_max location. As…

Subjects/Keywords: Magnetic Actuation; Magnetic levitation

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APA (6^th Edition):

Mehrtash, M. (2013). Bilateral Macro-Micro Teleoperation Using A Magnetic Actuation Mechanism. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/7909

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mehrtash, Moein. “Bilateral Macro-Micro Teleoperation Using A Magnetic Actuation Mechanism.” 2013. Thesis, University of Waterloo. Accessed March 01, 2021. http://hdl.handle.net/10012/7909.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mehrtash, Moein. “Bilateral Macro-Micro Teleoperation Using A Magnetic Actuation Mechanism.” 2013. Web. 01 Mar 2021.

Vancouver:

Mehrtash M. Bilateral Macro-Micro Teleoperation Using A Magnetic Actuation Mechanism. [Internet] [Thesis]. University of Waterloo; 2013. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10012/7909.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mehrtash M. Bilateral Macro-Micro Teleoperation Using A Magnetic Actuation Mechanism. [Thesis]. University of Waterloo; 2013. Available from: http://hdl.handle.net/10012/7909

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Vanderbilt University

2. Garbin, Nicolo. Endoscopic and magnetic actuation for miniature lifesaving devices.

Degree: PhD, Mechanical Engineering, 2019, Vanderbilt University

URL: http://hdl.handle.net/1803/10533

► The need for medical technologies that improve patient access to diagnostic techniques and treat pathological conditions in a minimally invasive approach is capitalized in this… (more)

▼ The need for medical technologies that improve patient access to diagnostic techniques and treat pathological conditions in a minimally invasive approach is capitalized in this dissertation with the development, characterization, and testing toward clinical use of a series of endoscopically and magnetically actuated devices. The ﬁrst half of this dissertation proposed an alternative solution to the use of conventional ﬂexible endoscopy for the diagnosis of the upper gastrointestinal tract. The proposed disposable ﬂexible endoscope is, compared to conventional endoscopy, more cost effective, intuitive, and hygienic. The device’s endoscopic tip is controlled via pneumatic actuation. Modeling was inspired from multi-backbone continuum robots, and two user interfaces were investigated. First, a robotic platform is used to tackle the closed-loop control problem, then a novel user interface allows direct user-to-task mapping via pure mechanical actuation. The effectiveness of the latter approach was further assessed during in-vivo and cadaveric trials, ease of use was instead determined via approved user studies that involved medical providers with different backgrounds. The device is currently undergoing design freeze toward human trials. The second half of this dissertation exploits robotic control of magnetic actuation to develop therapeutic medical devices with applications in minimally invasive surgery and subcutaneous implants. A laparoscopic retractor able to retract up to 10 times its own weight, and laparoscopic camera with an hemispherical workspace via a compact unique magnetic coupling, decrease by two the number of incisions needed for abdominal surgery. These technologies decrease trauma, pain, and risk of infection for the patients, and offer better visibility, surgical workspace access, and decrease trocar crowding for the surgeons. Then, a subcutaneously implantable pump developed for the treatment of refractory ascites removes a large quantity of ﬂuids without the need of on-board electronics. All of these devices were tested during ex-vivo and in-vivo trials highlighting the advantages and effectiveness of using magnetic coupling for clinically relevant therapeutic tasks. Advisors/Committee Members: Thomas J. Withrow (committee member), Robert J. Webster III (committee member), Nabil Simaan (committee member), Pietro Valdastri (Committee Chair), Keith L. Obstein (Committee Chair).

Subjects/Keywords: magnetic actuation; disposable; robotic; medical device

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APA (6^th Edition):

Garbin, N. (2019). Endoscopic and magnetic actuation for miniature lifesaving devices. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/10533

Chicago Manual of Style (16^th Edition):

Garbin, Nicolo. “Endoscopic and magnetic actuation for miniature lifesaving devices.” 2019. Doctoral Dissertation, Vanderbilt University. Accessed March 01, 2021. http://hdl.handle.net/1803/10533.

MLA Handbook (7^th Edition):

Garbin, Nicolo. “Endoscopic and magnetic actuation for miniature lifesaving devices.” 2019. Web. 01 Mar 2021.

Vancouver:

Garbin N. Endoscopic and magnetic actuation for miniature lifesaving devices. [Internet] [Doctoral dissertation]. Vanderbilt University; 2019. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1803/10533.

Council of Science Editors:

Garbin N. Endoscopic and magnetic actuation for miniature lifesaving devices. [Doctoral Dissertation]. Vanderbilt University; 2019. Available from: http://hdl.handle.net/1803/10533

Penn State University

3. Cowan, Brett Michael. Magnetically Induced Actuation and Optimization of the Miura-ori Structure.

Degree: 2015, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/27379

► Origami engineering is an emerging field that attempts to apply origami principles to engineering applications. One application is the folding/unfolding of origami structures by way… (more)

▼ Origami engineering is an emerging field that attempts to apply origami principles to engineering applications. One application is the folding/unfolding of origami structures by way of external stimuli, such as thermal fields, electrical fields, and/or magnetic fields, for active systems. This research aims to actuate the Miura-ori pattern from an initial flat state using neodymium magnets on an elastomer substrate within a magnetic field to assess performance characteristics versus magnet placement and orientation. Additionally, proof-of-concept devices using magneto-active elastomers (MAEs) patches will be studied. The MAE material consists of magnetic particles embedded and aligned within a silicon elastomer substrate then cured. In the presence of a magnetic field, both the neodymium magnets and MAE material align with the field, causing a magnetic moment and thus, magnetic work. In this work, the Miura-ori pattern was fabricated from a silicone elastomer substrate with prescribed, reduced-thickness creases and removed material at crease vertex points. Four magnetization orientation configurations of the Miura-ori pattern were generated and fabricated by attaching neodymium magnets to the Miura-ori substrates. The prototypes were tested within a magnetic field ranging from 0 – 240 mT and selected crease fold angles were measured at each field strength. Theoretical magnetic work for each configuration was calculated based on an origami folding model from the Miura-ori’s initial flat state to its completely folded state. These calculations were applied to a design space visualization program to determine the magnetization orientation for each configuration that resulted in the maximum possible theoretical work achieved. Each configuration was analyzed and compared in relation to its experimentally determined overall actuation, experimentally determined ability to follow the ideal folding behavior of the Miura-ori pattern, and the theoretical normalized work for fixed and varied magnetization orientations. The configuration with the highest overall rating of the aforementioned criteria was selected to be tested with the magnetization orientations that resulted in its maximum possible theoretical work. The configuration with the maximum theoretical normalized work was fabricated with attached neodymium magnets. A similar configuration with slightly different magnetization orientations resulting in an offset theoretical normalized work was also tested, and was fabricated using two methods: attached neodymium magnets and embedded MAE patches. The MAE patches were created using a 30% volume fraction of 325 mesh barium hexaferrite particles mixed with Dow Sylgard 184 silicone rubber compound at a 10:1 base to catalyst ratio and cured within a uniform (0.7 T) magnetic field in a prescribed alignment. Both sets of prototypes were tested using the same experimental setup as was used for the original four configurations and were compared using the same criterion. Configuration I*, which had magnetization orientations that… Advisors/Committee Members: Paris R Vonlockette, Thesis Advisor/Co-Advisor, Zoubeida Ounaies, Thesis Advisor/Co-Advisor.

Subjects/Keywords: Origami engineering; magnetic actuation; optimization; ATSV

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APA (6^th Edition):

Cowan, B. M. (2015). Magnetically Induced Actuation and Optimization of the Miura-ori Structure. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/27379

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cowan, Brett Michael. “Magnetically Induced Actuation and Optimization of the Miura-ori Structure.” 2015. Thesis, Penn State University. Accessed March 01, 2021. https://submit-etda.libraries.psu.edu/catalog/27379.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cowan, Brett Michael. “Magnetically Induced Actuation and Optimization of the Miura-ori Structure.” 2015. Web. 01 Mar 2021.

Vancouver:

Cowan BM. Magnetically Induced Actuation and Optimization of the Miura-ori Structure. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Mar 01]. Available from: https://submit-etda.libraries.psu.edu/catalog/27379.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cowan BM. Magnetically Induced Actuation and Optimization of the Miura-ori Structure. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/27379

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Vanderbilt University

4. Taddese, Addisu Zerihun. Magnetic Pose Estimation and Robotic Manipulation of Magnetically Actuated Capsule Endoscopes.

Degree: PhD, Electrical Engineering, 2018, Vanderbilt University

URL: http://hdl.handle.net/1803/13276

► Magnetic actuation is currently the most promising approach for actively and wirelessly manipulating capsule endoscopes (CEs) inside the gastrointestinal (GI) tract. Actively actuated CEs have… (more)

▼ Magnetic actuation is currently the most promising approach for actively and wirelessly manipulating capsule endoscopes (CEs) inside the gastrointestinal (GI) tract. Actively actuated CEs have the potential to transform current medical practice and significantly improve patient outcomes. In this dissertation, two fundamental problems associated with active actuation of CEs are studied. Our approach to solving these problems were developed in the context of advancing our robotically guided soft-tethered CE system toward clinical adoption. The first problem pertains to estimating the pose of a CE while it is inside a patient. Current magnetic field based pose estimation methods face significant challenges in their path to clinical adoption. First, due to presence of regions of magnetic field singularity, the accuracy of the system can be significantly degraded while being used for actuation. Second, current pose estimation methods need accurate knowledge of the capsule's initial pose before they can successfully track the capsule. This, however, may not be possible to do in clinical settings. We propose a novel hybrid approach employing a combination of static and time-varying magnetic field sources and show that this system has no regions of singularity while eliminating the need for initialization. The proposed system was experimentally validated for accuracy, workspace size, update rate and performance in regions where magnetic singularity previously existed. The second problem has to do with closed-loop control, where computed pose estimates are used as sensory feedback to compensate for deviation of the capsule's pose from the desired or commanded pose. We present two schemes of closed-loop control expanding existing formulations of magnetic control and integrating them with our pose estimation method. The controllers were validated in autonomous path following tasks in simulation and real world experiments. Our solution to these problems are foundational to the future development of effective tele-operation systems where the motion of the CE is transparently controlled by a physician. Advisors/Committee Members: D. Mitch Wilkes, (committee member), Keith Obstein (committee member), Pietro Valdastri (committee member), Xenofon Koutsoukos (committee member), Ákos Lédeczi (Committee Chair).

Subjects/Keywords: capsule endoscopy; magnetic actuation; magnetic pose estimation; magnetic localization; robotic endoscopy; magnetic manipulation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Taddese, A. Z. (2018). Magnetic Pose Estimation and Robotic Manipulation of Magnetically Actuated Capsule Endoscopes. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/13276

Chicago Manual of Style (16^th Edition):

Taddese, Addisu Zerihun. “Magnetic Pose Estimation and Robotic Manipulation of Magnetically Actuated Capsule Endoscopes.” 2018. Doctoral Dissertation, Vanderbilt University. Accessed March 01, 2021. http://hdl.handle.net/1803/13276.

MLA Handbook (7^th Edition):

Taddese, Addisu Zerihun. “Magnetic Pose Estimation and Robotic Manipulation of Magnetically Actuated Capsule Endoscopes.” 2018. Web. 01 Mar 2021.

Vancouver:

Taddese AZ. Magnetic Pose Estimation and Robotic Manipulation of Magnetically Actuated Capsule Endoscopes. [Internet] [Doctoral dissertation]. Vanderbilt University; 2018. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1803/13276.

Council of Science Editors:

Taddese AZ. Magnetic Pose Estimation and Robotic Manipulation of Magnetically Actuated Capsule Endoscopes. [Doctoral Dissertation]. Vanderbilt University; 2018. Available from: http://hdl.handle.net/1803/13276

University of Wollongong

5. Munoz, Fredy. Magnetic actuation for drug delivery in capsule endoscopy.

Degree: PhD, 2016, University of Wollongong

URL: 0910 MANUFACTURING ENGINEERING, 0913 MECHANICAL ENGINEERING ; https://ro.uow.edu.au/theses/4876

► The development of a highly controllable drug delivery system (DDS) for wireless capsule endoscopy (WCE) is an important field of research due to its… (more)

Subjects/Keywords: capsule endoscopy; surgical robotics; drug delivery; magnetic actuation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Munoz, F. (2016). Magnetic actuation for drug delivery in capsule endoscopy. (Doctoral Dissertation). University of Wollongong. Retrieved from 0910 MANUFACTURING ENGINEERING, 0913 MECHANICAL ENGINEERING ; https://ro.uow.edu.au/theses/4876

Chicago Manual of Style (16^th Edition):

Munoz, Fredy. “Magnetic actuation for drug delivery in capsule endoscopy.” 2016. Doctoral Dissertation, University of Wollongong. Accessed March 01, 2021. 0910 MANUFACTURING ENGINEERING, 0913 MECHANICAL ENGINEERING ; https://ro.uow.edu.au/theses/4876.

MLA Handbook (7^th Edition):

Munoz, Fredy. “Magnetic actuation for drug delivery in capsule endoscopy.” 2016. Web. 01 Mar 2021.

Vancouver:

Munoz F. Magnetic actuation for drug delivery in capsule endoscopy. [Internet] [Doctoral dissertation]. University of Wollongong; 2016. [cited 2021 Mar 01]. Available from: 0910 MANUFACTURING ENGINEERING, 0913 MECHANICAL ENGINEERING ; https://ro.uow.edu.au/theses/4876.

Council of Science Editors:

Munoz F. Magnetic actuation for drug delivery in capsule endoscopy. [Doctoral Dissertation]. University of Wollongong; 2016. Available from: 0910 MANUFACTURING ENGINEERING, 0913 MECHANICAL ENGINEERING ; https://ro.uow.edu.au/theses/4876

University of Toronto

6. Salmanipour, Sajad. MULTI-DEGREES-OF-FREEDOM WIRELESS ACTUATION OF SMALL MAGNETIC MECHANISMS.

Degree: PhD, 2020, University of Toronto

URL: http://hdl.handle.net/1807/101257

► Magnetic millimeter-scale robots are often actuated using externally generated magnetic fields. For most applications, these remote magnetic microrobots are located relatively far from the magnetic… (more)

▼ Magnetic millimeter-scale robots are often actuated using externally generated magnetic fields. For most applications, these remote magnetic microrobots are located relatively far from the magnetic field generation sources. In this condition, all microrobots receive approximately the same driving magnetic field, which we term a homogeneous magnetic field. For many microrobotic tasks such as drug dispensing, biopsy tool activation or grasping, multiple system degrees of freedom (DOF) must be controlled. To achieve multi-DOF control in a homogeneous magnetic field, clever system design is required. While some progress has been made in this area allowing up to six independent DOFs to be individually commanded, there has been no rigorous effort in determining the maximum achievable number of DOFs for systems with homogeneous magnetic field input. In this work, we show that this maximum is eight and we introduce the theoretical basis for this conclusion, relying on the number of independent usable components in a magnetic field at a point. To verify the claim experimentally, we first develop an electromagnetic field generation system capable of generation all the eight independent magnetic components at a single point, followed by a simple 8-DOF demonstration mechanism, to show the feasibility of eight independently actuated motions. Next, we introduce a design process to utilize the maximum number of independently actuated DOFs on a microrobot system. We make use of four classes of microrobotic mechanisms which are commonly used in practice and allow for the creation of more complex microrobotic mechanisms with up to eight actuated DOFs. The systematic design framework is presented in the form of an optimization problem, where the designer specifies the number of magnets, and the type and quantity of mechanisms of the microdevice. The result gives the optimized position and orientation of on-board magnets and axes for mechanism motion. To verify the functionality of the design process, we utilize it to develop a 7-DOF wireless robot for drug delivery applications. Next, to investigate the feasibility of utilizing magnetic actuation methods in minimally invasive surgery procedures, a 3-DOF wireless gripper prototype and an 8-DOF two-grippers mechanism will be presented. The method and design process presented here for achieving up to eight actuated DOFs in homogeneous quasi-static magnetic fields can be applied to any microrobotic system where multiple motions and on-board mechanisms can lead to a more effective system. Advisors/Committee Members: Diller, Eric David, Mechanical and Industrial Engineering.

Subjects/Keywords: Magnetic Field; Microrobotics; Multi-DOF; Wireless Actuation; 0771

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Salmanipour, S. (2020). MULTI-DEGREES-OF-FREEDOM WIRELESS ACTUATION OF SMALL MAGNETIC MECHANISMS. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/101257

Chicago Manual of Style (16^th Edition):

Salmanipour, Sajad. “MULTI-DEGREES-OF-FREEDOM WIRELESS ACTUATION OF SMALL MAGNETIC MECHANISMS.” 2020. Doctoral Dissertation, University of Toronto. Accessed March 01, 2021. http://hdl.handle.net/1807/101257.

MLA Handbook (7^th Edition):

Salmanipour, Sajad. “MULTI-DEGREES-OF-FREEDOM WIRELESS ACTUATION OF SMALL MAGNETIC MECHANISMS.” 2020. Web. 01 Mar 2021.

Vancouver:

Salmanipour S. MULTI-DEGREES-OF-FREEDOM WIRELESS ACTUATION OF SMALL MAGNETIC MECHANISMS. [Internet] [Doctoral dissertation]. University of Toronto; 2020. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1807/101257.

Council of Science Editors:

Salmanipour S. MULTI-DEGREES-OF-FREEDOM WIRELESS ACTUATION OF SMALL MAGNETIC MECHANISMS. [Doctoral Dissertation]. University of Toronto; 2020. Available from: http://hdl.handle.net/1807/101257

King Abdullah University of Science and Technology

7. Martinez Banderas, Aldo. Cancer Therapy based on Core-Shell Iron-Iron Oxide Nanowires.

Degree: Biological and Environmental Sciences and Engineering (BESE) Division, 2020, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/666239

► Nanomaterials have been widely investigated for improving the treatment of diseases acting as vectors for diverse therapies and as diagnostic tools. Iron-based nanowires possess promising… (more)

▼ Nanomaterials have been widely investigated for improving the treatment of diseases acting as vectors for diverse therapies and as diagnostic tools. Iron-based nanowires possess promising potential for biomedical applications due to their outstanding properties. The combination of different therapeutic and diagnostic strategies into one single platform is an approach for more efficient and safer treatments. In this thesis, I investigate the application of iron-iron oxide core-shell nanowires as therapeutic agents for cancer treatment. In particular, a novel method for multimodal cancer cell destruction was developed combining the optical, magneto-mechanical and chemotherapeutic properties of functionalized nanowires. By functionalizing the nanowires with doxorubicin through a pH-sensitive linker, the first treatment modality was achieved by selective intracellular drug release. The second treatment modality utilizes the mechanical disturbance exerted by the nanowires upon the application of a low-power alternating magnetic field. The third treatment modality exploits the capability of the nanowires to transform optical energy, absorbed from near-infrared irradiation, into heat. The efficiency of the three treatment modalities both independently and combined were tested in breast cancer cells with near complete cell death (90%). The combination of the different strategies can potentially reduce side effects and treatment time. Additionally, I studied the potential of these iron-iron oxide core-shell nanowires as diagnostic tools, included in the Appendix of this dissertation. Specifically, I studied their capability to act as magnetic resonance imaging contrast agents for cell labeling, detection and tracking. Therein, a high performance as T2 contrast agents was confirmed evaluating the effect of oxidation and surface coatings on the T2 contrast in the tailored transverse relaxivities. The detection of nanowire-labeled cancer cells was demonstrated in T2-weighted images of cells implanted in tissue-mimicking phantoms and in mouse brain. Labeling the cells with nanowires enabled high-resolution cell detection after in vivo implantation (~10 cells) over a minimum of 40 days. The capability of these magnetic nanowires of being remotely controllable and detectable make them an attractive option in the treatment and diagnosis of cancer and in cell therapy. Future directions include preclinical studies for testing the nanowire-based photothermal therapy for tumor ablation. Advisors/Committee Members: Kosel, Jürgen (advisor), Merzaban, Jasmeen (committee member), Ooi, Boon S. (committee member), Wilhelm, Claire (committee member).

Subjects/Keywords: Nanowires; Cancer Therapy; Combinatory strategy; Photothermal Therapy; Drug Delivery; Magnetic actuation

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APA (6^th Edition):

Martinez Banderas, A. (2020). Cancer Therapy based on Core-Shell Iron-Iron Oxide Nanowires. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/666239

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Martinez Banderas, Aldo. “Cancer Therapy based on Core-Shell Iron-Iron Oxide Nanowires.” 2020. Thesis, King Abdullah University of Science and Technology. Accessed March 01, 2021. http://hdl.handle.net/10754/666239.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Martinez Banderas, Aldo. “Cancer Therapy based on Core-Shell Iron-Iron Oxide Nanowires.” 2020. Web. 01 Mar 2021.

Vancouver:

Martinez Banderas A. Cancer Therapy based on Core-Shell Iron-Iron Oxide Nanowires. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2020. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10754/666239.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Martinez Banderas A. Cancer Therapy based on Core-Shell Iron-Iron Oxide Nanowires. [Thesis]. King Abdullah University of Science and Technology; 2020. Available from: http://hdl.handle.net/10754/666239

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

8. Dkhil, Mohamed. Modélisation, caractérisation et commande d'un système microrobotique magnétique à l'interface air/liquide : Modeling, characterization and control of a magnetic microrobotic system at the air/liquid interface.

Degree: Docteur es, Robotique, 2016, Université Pierre et Marie Curie – Paris VI

URL: http://www.theses.fr/2016PA066212

►

Les systèmes d’actionnement à distance pour la manipulation d’objets de taille micrométrique ont connu un développement sans précédent ces dernières années dans les laboratoires de… (more)

▼

Les systèmes d’actionnement à distance pour la manipulation d’objets de taille micrométrique ont connu un développement sans précédent ces dernières années dans les laboratoires de recherche. Ils permettent de contrôler à distance le déplacement et l’orientation d’objets en appliquant des champs de force à distance. Ils sont donc spécialement adaptés pour agir dans des milieux confinés pour lesquels les problèmes d’accessibilité empêchent l’utilisation de manipulateurs robotisés classiques. De plus la faible inertie de ces systèmes permet d’atteindre des cadences de manipulation importantes. Parmi les effets physiques exploitables pour actionner ces systèmes une attention particulière est portée sur les effets magnétiques, en raison des niveaux de forces élevés atteignables. L’état de l’art montre un nombre de travaux importants dans le domaine de l’actionnement magnétique en environnement liquide. Cependant les vitesses atteignables sont limitées par les frottements visqueux. Quelques études font état de l’utilisation de l’actionnement magnétique en milieu ambiant, mais les forces d’adhésion entre le substrat et la particule rend le système peu répétable. Cette thèse propose une approche originale alliant faibles frottements visqueux et grande répétabilité en considérant un milieu de travail peu étudié : l’interface air/liquide. Cette thèse s’intéresse plus particulièrement à la modélisation, la caractérisation, l’analyse des performances et la commande d’un système d’actionnement magnétique à l’interface air/liquide pour des applications à l’échelle micrométrique.

In recent years research laboratories have shown an increasing interest for non-contact actuation systems at micrometer scale. These systems control both the displacement and the orientation of the objects using remote force fields. They are of major interest in confined spaces in which traditional approaches based on robotic grippers are not suitable. In addition high manipulation throughputs can be reached due to the low inertia of these systems. Several physical principles can be considered as the actuation source. Among them a special attention is given to magnetic forces due to the high forces that can be applied to the objects. A large amount of work has been carried out on magnetic actuation systems for manipulation in liquid environments. However velocities are limited by viscous effects. A few studies are reported on magnetic systems in ambient environments. However repeatability is decreased by adhesion forces between the substrate and the objects. This work proposes an original approach with a good trade off between low viscous effects and high repeatability based on the use of a specific environment: the air/liquid interface. This thesis presents the modelling, the characterization, the performance analysis and the control of a magnetic actuation system at the air/liquid interface for applications at the micrometer scale.

Advisors/Committee Members: Gauthier, Michaël (thesis director), Régnier, Stéphane (thesis director).

Subjects/Keywords: Actionnement à distance; Magnétique; Interface air/liquide; Contrôle; Suivi de tajectoire; Microrobotique; Magnetic actuation; Air/liquid interface; Remote actuation; 629.89

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APA (6^th Edition):

Dkhil, M. (2016). Modélisation, caractérisation et commande d'un système microrobotique magnétique à l'interface air/liquide : Modeling, characterization and control of a magnetic microrobotic system at the air/liquid interface. (Doctoral Dissertation). Université Pierre et Marie Curie – Paris VI. Retrieved from http://www.theses.fr/2016PA066212

Chicago Manual of Style (16^th Edition):

Dkhil, Mohamed. “Modélisation, caractérisation et commande d'un système microrobotique magnétique à l'interface air/liquide : Modeling, characterization and control of a magnetic microrobotic system at the air/liquid interface.” 2016. Doctoral Dissertation, Université Pierre et Marie Curie – Paris VI. Accessed March 01, 2021. http://www.theses.fr/2016PA066212.

MLA Handbook (7^th Edition):

Dkhil, Mohamed. “Modélisation, caractérisation et commande d'un système microrobotique magnétique à l'interface air/liquide : Modeling, characterization and control of a magnetic microrobotic system at the air/liquid interface.” 2016. Web. 01 Mar 2021.

Vancouver:

Dkhil M. Modélisation, caractérisation et commande d'un système microrobotique magnétique à l'interface air/liquide : Modeling, characterization and control of a magnetic microrobotic system at the air/liquid interface. [Internet] [Doctoral dissertation]. Université Pierre et Marie Curie – Paris VI; 2016. [cited 2021 Mar 01]. Available from: http://www.theses.fr/2016PA066212.

Council of Science Editors:

Dkhil M. Modélisation, caractérisation et commande d'un système microrobotique magnétique à l'interface air/liquide : Modeling, characterization and control of a magnetic microrobotic system at the air/liquid interface. [Doctoral Dissertation]. Université Pierre et Marie Curie – Paris VI; 2016. Available from: http://www.theses.fr/2016PA066212

University of Melbourne

9. Leong, Florence Ching Ying. Trans-barrier local magnetic actuation for robotics abdominal surgery.

Degree: 2018, University of Melbourne

URL: http://hdl.handle.net/11343/225029

► The advances in surgical instruments have played a significant role in the reduction of surgical trauma on patients. The evolution of surgical applications to the… (more)

▼ The advances in surgical instruments have played a significant role in the reduction of surgical trauma on patients. The evolution of surgical applications to the current popular approaches of minimally invasive surgery (MIS), laparoendoscopic single-site surgery (LESS) and natural orifice transluminal endoscopic surgery (NOTES) integrated with the use of magnetic actuation emphasizes the benefits of magnetic systems in the field of abdominal surgery. The realisation of the magnetic-based surgical approaches has been explored through the use of magnets or magnetic sources (e.g. electromagnets) by exploiting magnetic linkages transmitted across the abdominal wall to guide, anchor and actuate surgical devices intra-abdominally, which introduces the local magnetic actuation (LMA) technique. A LMA unit within the system consists of an external actuating magnetic source driving a corresponding permanent magnet rotor in the internal surgical device to drive or actuate a degree-of-freedom (DOF) on a robotic manipulator. As the magnetic transmission from the external driving unit is closely targeting the internal driven units, hence localised, multiple LMA units can be used to drive multiple DOFs on a multi-DOF robotic surgical manipulator within the abdominal workspace. The use of permanent magnets as actuation sources to drive the LMA system was previously tested. Nonetheless, having fixed parameter (i.e. magnetic field), it is challenging for the magnets to adapt to configuration changes in the surgical setting, such as the variations in abdominal wall thickness as well as the misalignment between the external driving and the internal driven units. These variables, if not compensated, would affect the transmission of torque across the abdominal wall onto the permanent magnet rotor in the internal surgical device as magnetic field transmission reduces exponentially against distance. Hence, in this study, electromagnetic stators are used in place of the actuating permanent magnets, coining the term Local Electromagnetic Actuation (LEMA), to provide control variables (i.e. varying current signals to the stators) to compensate for the changes in transmitted torque due to the variables. Although the LEMA approach addresses the above limitation faced by the permanent magnet version of the LMA system, there are nonetheless other challenges that need to be dealt with for the LEMA system to work effectively. While there are many factors contributing to these challenges, two major problems inherent to the design and configuration of the LEMA system are identified to be addressed in this thesis. These crucial problems are due to the systematic disturbances within the system, and if not properly handled, will affect the performance of the system. One of these disturbances onto the LEMA system is caused by the magnetic interaction or interference by the neigbouring magnetic source(s) within a multi-DOF configuration. This is due to the close proximity the magnetic sources has to be placed to one another in a limited workspace…

Subjects/Keywords: local magnetic actuation; magnetic-based surgery; abdominal surgery; magnetic interaction; model-based controller; Internal Model Principle; disturbance rejection

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Leong, F. C. Y. (2018). Trans-barrier local magnetic actuation for robotics abdominal surgery. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/225029

Chicago Manual of Style (16^th Edition):

Leong, Florence Ching Ying. “Trans-barrier local magnetic actuation for robotics abdominal surgery.” 2018. Doctoral Dissertation, University of Melbourne. Accessed March 01, 2021. http://hdl.handle.net/11343/225029.

MLA Handbook (7^th Edition):

Leong, Florence Ching Ying. “Trans-barrier local magnetic actuation for robotics abdominal surgery.” 2018. Web. 01 Mar 2021.

Vancouver:

Leong FCY. Trans-barrier local magnetic actuation for robotics abdominal surgery. [Internet] [Doctoral dissertation]. University of Melbourne; 2018. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/11343/225029.

Council of Science Editors:

Leong FCY. Trans-barrier local magnetic actuation for robotics abdominal surgery. [Doctoral Dissertation]. University of Melbourne; 2018. Available from: http://hdl.handle.net/11343/225029

10. Vieille, Victor. Exploration de l’actionnement magnétique à distance de petits objets : application aux laboratoires sur puce : Exploration of remote magnetic actuation of small objects : application to lab-on-chip.

Degree: Docteur es, Nanoélectronique et nanotechnologie, 2019, Université Grenoble Alpes (ComUE)

URL: http://www.theses.fr/2019GREAT121

► Cette thèse explore l’actionnement magnétique à distance et en temps réel de micro-objets, dans l’objectif d’identifier et d’amorcer le développement de nouveaux outils pertinents dans… (more)

▼ Cette thèse explore l’actionnement magnétique à distance et en temps réel de micro-objets, dans l’objectif d’identifier et d’amorcer le développement de nouveaux outils pertinents dans le domaine émergent des laboratoires sur puces. L’idée maitresse est d’actionner des objets magnétiques de petite dimension et difficile d’accès, à l’aide d’un champ magnétique extérieur contrôlé. Si le champ est généré à distance simplement par des aimants pilotés à proximité, les points délicats sont la fabrication des micro-objets magnétiques, ainsi que la maitrise du couplage assurant l’actionnement. Cette double problématique est ici confrontée à différentes applications et résolue dans quatre projets innovants.Le premier projet vise l’actionnement collectif des nanoparticules super-paramagnétiques (NP) utilisées dans les tests biochimiques. Leur manipulation est difficile en raison de leur petite taille les rendant fortement diffusives. Pour augmenter les gradients et donc les forces sur les NPs, on utilise des micro-aimants qui génèrent des gradients locaux élevés, que l’on module en leur superposant le champ extérieur. On peut ainsi déclencher la capture des NP à la demande et les déplacer collectivement sur une longue distance. Ces techniques ont été en partie intégrées dans les tests immunologiques de la startup MagA Diagnostics. En outre, le lavage magnétique des NPs par transport au travers de solutions différentes a été démontré.Le second projet exploite le même phénomène pour déplacer deux surfaces solides l’une par rapport à l’autre grâce au champ extérieur généré à proximité, constituant ainsi un moteur linéaire pas à pas dont le rotor et stator sont intégrables, compacts et jetables. Le pas du moteur ne dépend que des paramètres de fabrication. La miniaturisation et l’actionnement en 2D sont alors possibles et ont été démontrés expérimentalement. Certains atouts différenciants de cet actionneur ont été utilisés pour réaliser, en coaction avec un aiguilleur dédié, une cartouche intégrant une bandelette papier mobile apte à absorber consécutivement, de manière programmable et polyvalente, divers fluides contenus dans la cartouche.Dans le troisième projet, on déforme un objet réalisé en matériau composite à la fois élastique et magnétique : une membrane souple dont l’aimantation hétérogène est structurée de manière contrôlée. L’application d’un champ tournant permet alors une déformation ondulatoire, progressive et réversible de la membrane. En l’intégrant à un support adéquat, ce mouvement de vague est appliqué au pompage péristaltique. Cette micro-pompe brevetée possède des atouts originaux adaptés à certaines problématiques de la microfluidique, lui conférant un potentiel industriel important.Enfin, le quatrième projet vise la fabrication de micro-actionneurs magnétiques aux géométries complexes par nano-impression 3D à deux photons. Une technique polyvalente de micro-fabrication de rupture a été mise au point consistant à fixer des microbilles magnétiques (D~20 µm) à un objet 3D nano-imprimé en matériau transparent et… Advisors/Committee Members: Cugat, Orphée (thesis director), Devillers, Thibaut (thesis director).

Subjects/Keywords: Actionnement magnétique; Actionnement à distance; Micro-Aimants; Champ magnétique tournant; Laboratoires sur puces; Micro-Robot; Magnetic actuation; Remote actuation; Micro-Magnet; Rotating magnetic field; Lab-On-Chip; Micro-Robot; 620

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APA (6^th Edition):

Vieille, V. (2019). Exploration de l’actionnement magnétique à distance de petits objets : application aux laboratoires sur puce : Exploration of remote magnetic actuation of small objects : application to lab-on-chip. (Doctoral Dissertation). Université Grenoble Alpes (ComUE). Retrieved from http://www.theses.fr/2019GREAT121

Chicago Manual of Style (16^th Edition):

Vieille, Victor. “Exploration de l’actionnement magnétique à distance de petits objets : application aux laboratoires sur puce : Exploration of remote magnetic actuation of small objects : application to lab-on-chip.” 2019. Doctoral Dissertation, Université Grenoble Alpes (ComUE). Accessed March 01, 2021. http://www.theses.fr/2019GREAT121.

MLA Handbook (7^th Edition):

Vieille, Victor. “Exploration de l’actionnement magnétique à distance de petits objets : application aux laboratoires sur puce : Exploration of remote magnetic actuation of small objects : application to lab-on-chip.” 2019. Web. 01 Mar 2021.

Vancouver:

Vieille V. Exploration de l’actionnement magnétique à distance de petits objets : application aux laboratoires sur puce : Exploration of remote magnetic actuation of small objects : application to lab-on-chip. [Internet] [Doctoral dissertation]. Université Grenoble Alpes (ComUE); 2019. [cited 2021 Mar 01]. Available from: http://www.theses.fr/2019GREAT121.

Council of Science Editors:

Vieille V. Exploration de l’actionnement magnétique à distance de petits objets : application aux laboratoires sur puce : Exploration of remote magnetic actuation of small objects : application to lab-on-chip. [Doctoral Dissertation]. Université Grenoble Alpes (ComUE); 2019. Available from: http://www.theses.fr/2019GREAT121

11. Ye, Zhou. Local Flow Manipulation by Rotational Motion of Magnetic Micro-Robots and Its Applications.

Degree: 2014, Carnegie Mellon University

URL: http://repository.cmu.edu/dissertations/429

► Magnetic micro-robots are small robots under 1mm in size, made of magnetic materials, with relatively simple structures and functionalities. Such micro-robots can be actuated and… (more)

▼ Magnetic micro-robots are small robots under 1mm in size, made of magnetic materials, with relatively simple structures and functionalities. Such micro-robots can be actuated and controlled remotely by externally applied magnetic fields, and hence have the potential to access small and enclosed spaces. Most of the existing magnetic micro-robots can operate in wet environments. When the robots are actuated by the applied magnetic field to move inside a viscous liquid, they invoke flow motions around them inside the liquid. The induced flows are relatively local as the velocity of these flows decays rapidly with the distance from a moving robot, and the flow patterns are highly correlated with the motions of the micro-robots which are controllable by the applied magnetic field. Therefore, it is possible to generate local flow patterns that cannot be easily done using other microfluidic techniques. In this work we propose to use rotational motion of the magnetic micro-robots for local manipulation of flows. We employ electromagnetic techniques to successfully deliver actuation and motion control onto the micro-robots. Rotational magnetic field is applied to induce rotational motion of micro-robots both when they stay near a surface and are suspended in the liquid. Rotational flows are locally generated in the vicinity of micro-robots inside the viscous liquid. Implementation of three major applications using the flows generated by the rotating micro-robots are demonstrated in this work: 1) Two-dimensional (2D) non-contact manipulation of micro-objects. 2) Three-dimensional (3D) propulsion for the micro-robot to swim in a liquid. 3) Size-based sorting of micro-particles in microfluidic channels under continuous flow. The first two applications occur in otherwise quiescent liquid, while the third requires the presence of non-zero background flow. For the first application, we propose two methods to achieve precise positioning of the microrobots on a surface: 1) Using visual-feedback-control to adjust the rotation for one single microrobot. Micro-robot can be precisely positioned at any location on a surface using this method. 2) Using a specially prepared surface with magnetic micro-docks embedded in it, which act as local magnetic traps for multiple micro-robots to hold their positions and operate in parallel. Physical models are established for both the micro-robot and the micro-objects present in the induced rotational flow. The rotational flows induced by rotating micro-robots are studied with numerical simulations. Experimental demonstrations are first given at sub-millimeter scale to verify the proposed method. Micro-manipulation of polymer beads is performed with both positioncontrol methods. Automated micro-manipulation is also achieved using visual-feedback. Micromanipulation at micron-scale is then performed to demonstrate the scalability and versatility of the proposed method. Non-contact manipulation is achieved for various micro-objects, including biological samples, using a single spherical micro-robot.…

Subjects/Keywords: micro-robotics; magnetic actuation; microfluidics

…Actuation of Spherical Magnetic Micro-Robots . . . . . . . . . . 2.4.2 Rotational Flows Induced by… …3.4.1 Magnetic Actuation . . . . . . . . . . . . . . . . . . . . 3.4.2 Fluidic Drag Force and… …introduce the magnetic actuation methods to achieve controllable rotational motion of micro-robots… …maintain a large level of magnetic torque for spinning actuation, the magnetization values are… …Rotational Flows Induced by Magnetic Micro-Robots for 2D Non-Contact Manipulation 2.1 Introduction…

10 more images…

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APA (6^th Edition):

Ye, Z. (2014). Local Flow Manipulation by Rotational Motion of Magnetic Micro-Robots and Its Applications. (Thesis). Carnegie Mellon University. Retrieved from http://repository.cmu.edu/dissertations/429

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ye, Zhou. “Local Flow Manipulation by Rotational Motion of Magnetic Micro-Robots and Its Applications.” 2014. Thesis, Carnegie Mellon University. Accessed March 01, 2021. http://repository.cmu.edu/dissertations/429.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ye, Zhou. “Local Flow Manipulation by Rotational Motion of Magnetic Micro-Robots and Its Applications.” 2014. Web. 01 Mar 2021.

Vancouver:

Ye Z. Local Flow Manipulation by Rotational Motion of Magnetic Micro-Robots and Its Applications. [Internet] [Thesis]. Carnegie Mellon University; 2014. [cited 2021 Mar 01]. Available from: http://repository.cmu.edu/dissertations/429.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ye Z. Local Flow Manipulation by Rotational Motion of Magnetic Micro-Robots and Its Applications. [Thesis]. Carnegie Mellon University; 2014. Available from: http://repository.cmu.edu/dissertations/429

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Toronto

12. Lim, Andrew William. Wireless Magnetically-actuated Dexterous Forceps Instruments for Neuroendoscopy.

Degree: 2019, University of Toronto

URL: http://hdl.handle.net/1807/102970

►

Robot-assisted minimally invasive surgical techniques offer improved instrument precision and dexterity, reduced patient trauma and risk, and lessens the skill gap among surgeons. These approaches… (more)

Subjects/Keywords: Forceps; Magnetic Actuation; Minimally Invasive Surgery; Neuroendoscopy; Surgical Robotics; Surgical Tool; 0541

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APA (6^th Edition):

Lim, A. W. (2019). Wireless Magnetically-actuated Dexterous Forceps Instruments for Neuroendoscopy. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/102970

Chicago Manual of Style (16^th Edition):

Lim, Andrew William. “Wireless Magnetically-actuated Dexterous Forceps Instruments for Neuroendoscopy.” 2019. Masters Thesis, University of Toronto. Accessed March 01, 2021. http://hdl.handle.net/1807/102970.

MLA Handbook (7^th Edition):

Lim, Andrew William. “Wireless Magnetically-actuated Dexterous Forceps Instruments for Neuroendoscopy.” 2019. Web. 01 Mar 2021.

Vancouver:

Lim AW. Wireless Magnetically-actuated Dexterous Forceps Instruments for Neuroendoscopy. [Internet] [Masters thesis]. University of Toronto; 2019. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1807/102970.

Council of Science Editors:

Lim AW. Wireless Magnetically-actuated Dexterous Forceps Instruments for Neuroendoscopy. [Masters Thesis]. University of Toronto; 2019. Available from: http://hdl.handle.net/1807/102970

University of Kentucky

13. Torabi, Soroosh. TORQUE RESPONSE OF THIN-FILM FERROMAGNETIC PRISMS IN UNIFORM MAGNETIC FIELDS AT MACRO AND MICRO SCALES.

Degree: 2017, University of Kentucky

URL: https://uknowledge.uky.edu/me_etds/95

► The non-contact nature of magnetic actuation makes it useful in a variety of microscale applications, from microfluidics and lab-on-a-chip devices to classical MEMS or even… (more)

Subjects/Keywords: magnetic torque; ferromagnetic thin-films; macro/micro actuation; microrobotics; Electro-Mechanical Systems; Manufacturing; Mechanical Engineering

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APA (6^th Edition):

Torabi, S. (2017). TORQUE RESPONSE OF THIN-FILM FERROMAGNETIC PRISMS IN UNIFORM MAGNETIC FIELDS AT MACRO AND MICRO SCALES. (Masters Thesis). University of Kentucky. Retrieved from https://uknowledge.uky.edu/me_etds/95

Chicago Manual of Style (16^th Edition):

Torabi, Soroosh. “TORQUE RESPONSE OF THIN-FILM FERROMAGNETIC PRISMS IN UNIFORM MAGNETIC FIELDS AT MACRO AND MICRO SCALES.” 2017. Masters Thesis, University of Kentucky. Accessed March 01, 2021. https://uknowledge.uky.edu/me_etds/95.

MLA Handbook (7^th Edition):

Torabi, Soroosh. “TORQUE RESPONSE OF THIN-FILM FERROMAGNETIC PRISMS IN UNIFORM MAGNETIC FIELDS AT MACRO AND MICRO SCALES.” 2017. Web. 01 Mar 2021.

Vancouver:

Torabi S. TORQUE RESPONSE OF THIN-FILM FERROMAGNETIC PRISMS IN UNIFORM MAGNETIC FIELDS AT MACRO AND MICRO SCALES. [Internet] [Masters thesis]. University of Kentucky; 2017. [cited 2021 Mar 01]. Available from: https://uknowledge.uky.edu/me_etds/95.

Council of Science Editors:

Torabi S. TORQUE RESPONSE OF THIN-FILM FERROMAGNETIC PRISMS IN UNIFORM MAGNETIC FIELDS AT MACRO AND MICRO SCALES. [Masters Thesis]. University of Kentucky; 2017. Available from: https://uknowledge.uky.edu/me_etds/95

University of Texas – Austin

14. Srikant, Sukumar. Persistence filters for controller and observer design in singular gain systems.

Degree: PhD, Aerospace Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2011-05-3118

► This dissertation develops a general framework for designing stabilizing feedback controllers and observers for dynamics with state/time dependent gains on the control signals and measured… (more)

▼ This dissertation develops a general framework for designing stabilizing feedback controllers and observers for dynamics with state/time dependent gains on the control signals and measured outputs. These gains have potential singularity periods but satisfy a technically non-trivial condition referred to as persistence of excitation. A persistence filter design constitutes the primary theoretical innovation of this work around which the controller and observer development is centered. Application areas of singular gain systems considered in this study include robotics, biomechanics, intelligent structures and spacecrafts. Several representative problems involving singular, time-dependent gains are addressed. The specific contributions of this dissertation are outlined as follows: (i) a stabilizing feedback for linear, single-input systems with time-varying, singular control scaling is designed that allows arbitrary exponential convergence rate for the closed-loop dynamics. An adaptive control generalization of this result allows asymptotic convergence in presence of unknown plant parameters. An extension to a special, single-input nonlinear system in the controller canonical form is also proposed. It is proven that this control design results in bounded tracking error signals for a trajectory tracking objective; (ii) observer design for linear, single-output systems with time-varying, singular measurement gains is considered. A persistence filter similar in structure to the control counterpart aids an observer design that guarantees exponential state reconstruction with arbitrary convergence rates; (iii) the observer and controller designs are combined to obtain an exponentially stabilizing output feedback controller for linear, single-input, single-output dynamics with singular gains on both the control and measurements. A novel separation property is established as a consequence. The construction motivates applications to stabilization with reversible transducers which can switch between sensor and actuator modes. The results are verified on two illustrative applications, vibration control using piezoelectric devices and inverted pendulum stabilization with a DC motor. The linear result is further generalized to include state dependent gains; (iv) application of the persistence filter theory to spacecraft attitude stabilization using intermittent actuation is explored. The intermittence is characterized by a time-varying, periodically singular control gain. A nonlinear persistence filter allows construction of an exponentially stabilizing controller and simulations verify convergence with intermittent actuation where conventional proportional-derivative control fails; (v) a stabilization result for a special multi-input, linear system with time-varying matrix control gains is presented. The matrix gain is assumed to be diagonal but allows fewer controls than states subject to a controllability assumption in absence of the singular gain matrix. The single-input adaptive control results are shown to extend to the… Advisors/Committee Members: Akella, Maruthi Ram, 1972- (advisor), Lightsey, E G. (committee member), Bennighof, Jeffrey K. (committee member), Hull, David G. (committee member), Griffin, Lisa (committee member).

Subjects/Keywords: Feedback control systems; Magnetic actuation; Magnetic torquers; Feedback controllers; Adaptive control; Singular gain systems; Intermittent control; Spacecraft attitude stabilization; Space vehicles

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Srikant, S. (2011). Persistence filters for controller and observer design in singular gain systems. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-05-3118

Chicago Manual of Style (16^th Edition):

Srikant, Sukumar. “Persistence filters for controller and observer design in singular gain systems.” 2011. Doctoral Dissertation, University of Texas – Austin. Accessed March 01, 2021. http://hdl.handle.net/2152/ETD-UT-2011-05-3118.

MLA Handbook (7^th Edition):

Srikant, Sukumar. “Persistence filters for controller and observer design in singular gain systems.” 2011. Web. 01 Mar 2021.

Vancouver:

Srikant S. Persistence filters for controller and observer design in singular gain systems. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2011. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-3118.

Council of Science Editors:

Srikant S. Persistence filters for controller and observer design in singular gain systems. [Doctoral Dissertation]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-3118

Indian Institute of Science

15. Sri Ram Shankar, R. A Probing System for Dynamic Mode Atomic Force Microscopy Based on Specialized Probes.

Degree: PhD, Engineering, 2019, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/4292

► The dynamic mode atomic force microscope (AFM) is a versatile tool that uses a resonantly excited micro-cantilever probe to obtain a sample’s topography and to… (more)

▼ The dynamic mode atomic force microscope (AFM) is a versatile tool that uses a resonantly excited micro-cantilever probe to obtain a sample’s topography and to characterize its material properties. While a number of useful techniques have been developed for interacting with the sample, conventional AFM probes and AFM systems do not facilitate their effective implementation. This thesis investigates the design of specialized AFM probes and the development of a novel probing system that improves the speed of imaging and enhances the sensitivity to material properties in dynamic mode AFM. In order to perform high speed imaging, an integrated high-bandwidth magnetic actuation system, comprising a special probe and an actuator, is designed and developed. Subsequently, the actuation system is fabricated and evaluated using an in-house developed measurement system to possess an eigen-frequency of 104 kHz and a range of 225 nm. In aqueous medium, the probe is shown to suffer 3 times lesser reduction in eigen-frequency compared to a conventional probe of similar eigen-frequency in air. In order to achieve enhanced sensitivity to material properties, a systematic approach is proposed to design and fabricate probes with specified eigen-frequencies. The proposed approach is employed to design and develop a flexural harmonic probe with eigen-frequencies in the ratio 1:2 and a torsional harmonic probe with eigen-frequencies in the ratio 1:2:3. The experimentally evaluated eigen-frequency ratios are shown to match the specifications to within 0.4% and 2% respectively. Further, harmonic probes with exchangeable tips are proposed and a prototype probe is fabricated and evaluated. The developed harmonic probes are shown to be significantly more sensitive to tip-sample forces. To effectively exploit the high speed and sensitivity of the developed probes, a custom AFM system is designed and developed in-house. The AFM includes a novel Z-magnetic actuation system having bandwidth in excess of 3 MHz and an XY nano-positioning system suitable for video-rate imaging. A novel measurement system based on optical beam deflection is developed and evaluated to measure XY-motion of the positioner. High speed control hardware based on Field Programmable Gate Array (FPGA) has been used for data acquisition and real-time control, with update rates of more than 5 MHz. The developed system is demonstrated to enhance the positioning bandwidth of the high-speed AFM probe, and subsequently employed in high-speed dynamic mode AFM imaging at rates upto 1.25 frames/second. Finally, the potential of the developed system for video-rate dynamic mode AFM imaging, and in-situ material characterization is discussed. Advisors/Committee Members: Jayanth, G R (advisor).

Subjects/Keywords: AFM Modes; High Speed Probes; Atomic Force Microscopy; Integrated Magnetic Actuation System; Integrated Actuation System; AFM Probe; Flexural Harmonic Probes; Instrumentation and Applied Physics

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APA (6^th Edition):

Sri Ram Shankar, R. (2019). A Probing System for Dynamic Mode Atomic Force Microscopy Based on Specialized Probes. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/4292

Chicago Manual of Style (16^th Edition):

Sri Ram Shankar, R. “A Probing System for Dynamic Mode Atomic Force Microscopy Based on Specialized Probes.” 2019. Doctoral Dissertation, Indian Institute of Science. Accessed March 01, 2021. http://etd.iisc.ac.in/handle/2005/4292.

MLA Handbook (7^th Edition):

Sri Ram Shankar, R. “A Probing System for Dynamic Mode Atomic Force Microscopy Based on Specialized Probes.” 2019. Web. 01 Mar 2021.

Vancouver:

Sri Ram Shankar R. A Probing System for Dynamic Mode Atomic Force Microscopy Based on Specialized Probes. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2019. [cited 2021 Mar 01]. Available from: http://etd.iisc.ac.in/handle/2005/4292.

Council of Science Editors:

Sri Ram Shankar R. A Probing System for Dynamic Mode Atomic Force Microscopy Based on Specialized Probes. [Doctoral Dissertation]. Indian Institute of Science; 2019. Available from: http://etd.iisc.ac.in/handle/2005/4292

16. Iss, Cécile. Elaboration de micro/nanopinces magnétiques pour applications biotechnologiques : Elaboration of magnetic micro/nano-tweezers for biotechnological applications.

Degree: Docteur es, Nanophysique, 2015, Université Grenoble Alpes (ComUE)

URL: http://www.theses.fr/2015GREAY018

►

Cette thèse propose de réaliser des micro/nano-pinces magnétiques articulées dont l'actionnement à distance est obtenu par l'application d'un champ magnétique. Cette idée innovante consiste à… (more)

▼

Cette thèse propose de réaliser des micro/nano-pinces magnétiques articulées dont l'actionnement à distance est obtenu par l'application d'un champ magnétique. Cette idée innovante consiste à relier par l'un de leurs côtés deux microparticules magnétiques parallélépipédiques à l'aide d'une nano-charnière en or flexible. Destinées à des applications biotechnologiques et médicales, ces pinces ont pour finalité de capturer des micro/nano-objets ciblés biochimiquement pour y appliquer et mesurer des forces. Le défi de ce projet était de mener, à partir d'une idée simple, un ensemble d'études à la fois théoriques et technologiques, pour aboutir à une première preuve de concept. Dans ce but, un modèle analytique a d'abord été construit pour prédire le comportement magnéto-mécanique des pinces en fonction de divers paramètres physiques. Ensuite, un procédé de fabrication inspiré des techniques de la microélectronique a été développé pour parvenir à la réalisation d'un prototype de pince fonctionnel. Enfin, l'ouverture par l'action d'un champ magnétique de pinces fixées à un substrat, a pu être démontrée à l'aide d'une expérience originale installée dans un microscope électronique à balayage. Les résultats de ces expériences, en bon accord avec nos prédictions théoriques, ont permis de quantifier le comportement mécanique de la nano-charnière en or. Fixées à un substrat, ces pinces forment un réseau de micro-surfaces réfléchissantes qui trouveront des applications en microfluidique (bio-puces) ou en nano-physique. Libérées en solution, les pinces pourraient être employées de manière originale en micro-manipulation d'objets biologiques ou diagnostic et thérapie cellulaire.

The objective of this thesis was to elaborate magnetic micro/nano-tweezers remotely actuable by the application of a magnetic field. This innovative idea consists in binding two parallelepiped magnetic microparticles by one of their sides with a flexible gold nano-hinge. Intended for biotechnological and medical applications, these tweezers aim at capturing biochemically targeted micro/nano-objects, in order to exert forces on them and perform force measurements. In this project starting from a simple idea, the challenge was to carry out theoretical and technological studies leading to a first proof of concept. To this end, an analytical model was first elaborated to predict the magneto-elastic behavior of the tweezers, depending on various physical parameters. Then, a fabrication process inspired from microelectronic techniques was developed to complete a functional prototype of tweezers. Finally, the remote actuation of such tweezers, kept attached to a substrate, by the application of a magnetic field, was demonstrated using an original experiment set up inside a scanning electron microscope. These experiments yielded results in good agreement with our theoretical predictions and allowed the quantification of the gold nano-hinge elastic behavior. Attached to a substrate, these tweezers constitute an array of reflective micro-surfaces, which can find…

Advisors/Committee Members: Dieny, Bernard (thesis director).

Subjects/Keywords: Micropinces magnétiques; Biotechnologie; Modélisation de torques magnétiques; Nanofabrication; Vortex magnétique; Magnetic microtweezers; Remote actuation; Biotechnology; Magnetic torques modeling; Nanofabrication; Magnetic vortex; 530

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APA (6^th Edition):

Iss, C. (2015). Elaboration de micro/nanopinces magnétiques pour applications biotechnologiques : Elaboration of magnetic micro/nano-tweezers for biotechnological applications. (Doctoral Dissertation). Université Grenoble Alpes (ComUE). Retrieved from http://www.theses.fr/2015GREAY018

Chicago Manual of Style (16^th Edition):

Iss, Cécile. “Elaboration de micro/nanopinces magnétiques pour applications biotechnologiques : Elaboration of magnetic micro/nano-tweezers for biotechnological applications.” 2015. Doctoral Dissertation, Université Grenoble Alpes (ComUE). Accessed March 01, 2021. http://www.theses.fr/2015GREAY018.

MLA Handbook (7^th Edition):

Iss, Cécile. “Elaboration de micro/nanopinces magnétiques pour applications biotechnologiques : Elaboration of magnetic micro/nano-tweezers for biotechnological applications.” 2015. Web. 01 Mar 2021.

Vancouver:

Iss C. Elaboration de micro/nanopinces magnétiques pour applications biotechnologiques : Elaboration of magnetic micro/nano-tweezers for biotechnological applications. [Internet] [Doctoral dissertation]. Université Grenoble Alpes (ComUE); 2015. [cited 2021 Mar 01]. Available from: http://www.theses.fr/2015GREAY018.

Council of Science Editors:

Iss C. Elaboration de micro/nanopinces magnétiques pour applications biotechnologiques : Elaboration of magnetic micro/nano-tweezers for biotechnological applications. [Doctoral Dissertation]. Université Grenoble Alpes (ComUE); 2015. Available from: http://www.theses.fr/2015GREAY018

17. Mats, Lili. Continuous and Digital Approaches to Manipulation and Detection of Analytes on Microfluidic Devices .

Degree: Chemistry, 2016, Queens University

URL: http://hdl.handle.net/1974/14180

► Microfluidic devices are extremely popular in the area of analytical research as they reduce sample input requirements, have low operational cost, fast analysis time, high… (more)

▼ Microfluidic devices are extremely popular in the area of analytical research as they reduce sample input requirements, have low operational cost, fast analysis time, high separation resolution and low detection limits. A multitude of analytical techniques has been adapted to the microdevice format, including pre-treatment, separation, and detection. Depending on how the fluid is addressed and manipulated, microfluidics can be sub-divided into the “continuous-flow” and digital microfluidics (DMF) approaches. This thesis aims to demonstrate the versatility of microfluidic field of research, where a number of actuation approaches, fabrication methods and materials, on-chip operations and applications were explored. “Continuous-flow” microfluidics allows manipulating the bulk of the sample through the narrow channels under the applied force. Fabrication techniques unique to thermoplastics were utilized to fabricate a “continuous-flow” device capable of separating small drugs and large biological molecules, where a microstructured fibre served as an electrospray ionization mass spectrometry (ESI-MS) emitter. Interest in DMF, where discrete droplets are addressed and manipulated independently, has grown rapidly due to the versatility that arises from non-linear control of fluids. The most common approaches to droplet manipulation are based on either electrowetting-on-dielectric (EWOD) or magnetic interactions. EWOD devices were fabricated with standard photolithography procedures, where coatings with varying degrees of hydrophobicity were explored for EWOD actuation – natural leaf surface, Teflon® AF, and a series of fluorinated silica nanoparticle-based materials. The magnetic actuation approach is based on the interaction of an external magnetic field and magnetically susceptible material inside the droplet, which can be transported over a low-friction surface. Natural superhydrophobic leaf, hydrophobic Teflon, and a commercial superhydrophobic surface were compared for their suitability for the particle-based magnetic actuation. We demonstrated that a commercial coating has excellent compatibility with magnetic actuation, where high actuation speed was reproducibly achieved. We also developed a novel “particle-free” method of magnetic manipulation, where instead of magnetic particles, droplets contained paramagnetic salts with high magnetic susceptibilities were used. Droplets of five paramagnetic salts were efficiently actuated over the commercial superhydrophobic surface, where salts with higher magnetic susceptibility required lower concentrations and achieved higher actuation speed. The “particle-free” approach was used with online fluorescence detection of an anti-cancer drug.

Subjects/Keywords: Microfluidics ; Magnetic Actuation ; EWOD ; Digital Microfluidics

…104 Chapter 4 Magnetic Droplet Actuation on Natural (Colocasia Leaf) and… …135 Chapter 5 “Particle-free” Magnetic Actuation of Droplets on Superhydrophobic Surfaces… …5 Figure 1.3: Schematic of magnetic actuation DMF approach and a typical device… …133 Figure 4.20: Possible actuation mechanisms of a droplet containing 6 mg/mL magnetic… …paramagnetic salt solutions at different concentrations tested for magnetic actuation; (bottom…

11 more images…

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APA (6^th Edition):

Mats, L. (2016). Continuous and Digital Approaches to Manipulation and Detection of Analytes on Microfluidic Devices . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/14180

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mats, Lili. “Continuous and Digital Approaches to Manipulation and Detection of Analytes on Microfluidic Devices .” 2016. Thesis, Queens University. Accessed March 01, 2021. http://hdl.handle.net/1974/14180.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mats, Lili. “Continuous and Digital Approaches to Manipulation and Detection of Analytes on Microfluidic Devices .” 2016. Web. 01 Mar 2021.

Vancouver:

Mats L. Continuous and Digital Approaches to Manipulation and Detection of Analytes on Microfluidic Devices . [Internet] [Thesis]. Queens University; 2016. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1974/14180.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mats L. Continuous and Digital Approaches to Manipulation and Detection of Analytes on Microfluidic Devices . [Thesis]. Queens University; 2016. Available from: http://hdl.handle.net/1974/14180

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

North Carolina State University

18. Duval, Luis Denit. Low Power Valve Actuation Using Trans-Permanent Magnetics.

Degree: PhD, Mechanical Engineering, 2003, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/5840

► The subject of magnetic actuators is very broad, and encompasses a wide range of technologies, magnetic circuit topologies, and performance characteristics for an ever-increasing spectrum… (more)

▼ The subject of magnetic actuators is very broad, and encompasses a wide range of technologies, magnetic circuit topologies, and performance characteristics for an ever-increasing spectrum of applications. As a consequence of recent advances in soft and hard magnetic materials and developments in power electronics, microprocessors and digital control strategies, and the continuing demand for higher performance motion control systems, there appears to be more research and development activity in magnetic actuators for applications spanning all market sectors than at any time. Thus many actuator types and topologies are emerging with widely varying operational characteristics, in terms of displacement (rotary or linear), speed of response, position accuracy and duty cycle. In this dissertation, a rational approach for switching the states of permanent magnets through an on-board magnetization process is presented. The resulting dynamic systems are referred to as trans-permanent magnetic systems (T-PM). The first part of this research focuses on the governing equations needed for the analysis of trans-permanent magnetic systems. Their feasibility is demonstrated experimentally. In doing so, a method that has the potential of leading to new ultra-low power designs for electromechanical devices is introduced. In the second part of this research, the aforementioned developments in T-PM are applied to the problem of low power valves. Whereas alternate approaches to low power valve control may utilize latching to maintain valve position during inactive periods, an approach that eliminates the need for latching mechanisms is presented. Instead, the principles of T-PM are employed to switch the states of permanent magnets; the used of permanent magnets instead of electromagnets eliminates power consumption during inactive periods, thereby reducing power consumption to ultra-low levels. The magnets in a T-PM actuator are configured in a stack. The relationships between the strength and number of magnets in the stack and the stroke and resolution of the actuator are developed. This dissertation reports on the design and testing of a prototype valve actuator that uses a stack pf T-PM with alternating polarity. It is shown that this stack is well suited for discrete state process valves having a small number of states. It is concluded that the trans-permanent valve represents a promising valve actuation technology. Advisors/Committee Members: Dr. Richard F. Keltie, Committee Member (advisor), Dr. Mohammed A. Zikry, Committee Member (advisor), Dr. Lawrence M. Silverberg, Committee Chair (advisor), Dr. Gregory D. Buckner, Committee Member (advisor).

Subjects/Keywords: Magnetism; Trans-Permanent Magnetics; Valve; Magnetic Actuation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Duval, L. D. (2003). Low Power Valve Actuation Using Trans-Permanent Magnetics. (Doctoral Dissertation). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/5840

Chicago Manual of Style (16^th Edition):

Duval, Luis Denit. “Low Power Valve Actuation Using Trans-Permanent Magnetics.” 2003. Doctoral Dissertation, North Carolina State University. Accessed March 01, 2021. http://www.lib.ncsu.edu/resolver/1840.16/5840.

MLA Handbook (7^th Edition):

Duval, Luis Denit. “Low Power Valve Actuation Using Trans-Permanent Magnetics.” 2003. Web. 01 Mar 2021.

Vancouver:

Duval LD. Low Power Valve Actuation Using Trans-Permanent Magnetics. [Internet] [Doctoral dissertation]. North Carolina State University; 2003. [cited 2021 Mar 01]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5840.

Council of Science Editors:

Duval LD. Low Power Valve Actuation Using Trans-Permanent Magnetics. [Doctoral Dissertation]. North Carolina State University; 2003. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5840

Massey University

19. Nagao, Riichi. Dynamic transverse force regulation of axially-moving flexible media with advanced guiding and actuation : a thesis presented in partial fulfilment of the requirements for the degree of Master of Engineering in Mechatronics, School of Engineering and Advanced Technology, Massey University, Albany, New Zealand .

Degree: 2011, Massey University

URL: http://hdl.handle.net/10179/2470

► The rapid growth of computing and information technology has enabled pervasive access to the World Wide Web. Over 280EB of digital data has been generated… (more)

▼ The rapid growth of computing and information technology has enabled pervasive access to the World Wide Web. Over 280EB of digital data has been generated from around the world and flowing in the digital universe; as a result, the need for data storage has grown rapidly. A variety of information storage solutions such as hard disk drive (HDD) products that are common information storages for personal computing are available in the market. Modern magnetic tape data storage in terms of its capacity and reliability has been employed as an ideal solution for enterprise-level storage of archival data with applications that include financial records, satellite images, and consumer databases. In magnetic tape technology, the thin, flexible media is transported between the supply and take up packs at a prescribed speed and tension, and over guides and the read/write head. As the tape is transported, in-plane vibration of axially moving tape, known as lateral tape motion (LTM), arises from excitation sources such as the run out of tape pack and impacts between the tape and the flanges on guides or packs. LTM has been identified as a major factor that degrades recording accuracy. Limiting the LTM is the one of the keys that enables the multi-terabytes data storage, and flanged roller guides are commonly implemented in modern tape drives. However, for higher recording density, thinner media is desirable. Reducing the thickness of media can significantly decrease its stiffness and increase the likelihood of damage to media edges by adjacent mechanical components on the guiding path. To avoid this, alternative tape guiding and actuation are required, and many advanced guiding mechanisms without the use of flanged guides have been developed to reduce lateral tape motion in industry and academia. The transverse force (tension) applied to the travelling tape is another key element of LTM dynamics and is controlled using the dynamics of tape pack driving sources in the modern tape drive products in using an open loop control logic. However, the developing advanced guiding and actuation technologies influence the tension irregularly and the current tension control algorithm is not able to handle the irregular changes of tension. An active tension control is required to feasibly advance LTM actuations. This thesis is motivated by the need for future engineering advances in guiding and actuation technologies for magnetic tape. Advanced guiding and actuation technologies have been developed to enable the active tension (transverse force) actuation of axially moving tape. An advanced tension actuation technology of axially moving media with dynamic tape path alternation using a novel rotary guider is considered in this thesis, and its effectiveness and technical feasibility is analysed in the context of actuating travelling tape tension. The specific issues addressed in this thesis are listed below. Development of linear magnetic tape transport system with an advanced active tension actuation. • A homemade linear magnetic tape…

Subjects/Keywords: Magnetic tape technology; Axially moving tape; Advanced tension actuation technology; Rotary guider; Dynamic tape path alternation; Mechatronics; Axially-moving flexible media

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APA (6^th Edition):

Nagao, R. (2011). Dynamic transverse force regulation of axially-moving flexible media with advanced guiding and actuation : a thesis presented in partial fulfilment of the requirements for the degree of Master of Engineering in Mechatronics, School of Engineering and Advanced Technology, Massey University, Albany, New Zealand . (Thesis). Massey University. Retrieved from http://hdl.handle.net/10179/2470

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nagao, Riichi. “Dynamic transverse force regulation of axially-moving flexible media with advanced guiding and actuation : a thesis presented in partial fulfilment of the requirements for the degree of Master of Engineering in Mechatronics, School of Engineering and Advanced Technology, Massey University, Albany, New Zealand .” 2011. Thesis, Massey University. Accessed March 01, 2021. http://hdl.handle.net/10179/2470.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nagao, Riichi. “Dynamic transverse force regulation of axially-moving flexible media with advanced guiding and actuation : a thesis presented in partial fulfilment of the requirements for the degree of Master of Engineering in Mechatronics, School of Engineering and Advanced Technology, Massey University, Albany, New Zealand .” 2011. Web. 01 Mar 2021.

Vancouver:

Nagao R. Dynamic transverse force regulation of axially-moving flexible media with advanced guiding and actuation : a thesis presented in partial fulfilment of the requirements for the degree of Master of Engineering in Mechatronics, School of Engineering and Advanced Technology, Massey University, Albany, New Zealand . [Internet] [Thesis]. Massey University; 2011. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10179/2470.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nagao R. Dynamic transverse force regulation of axially-moving flexible media with advanced guiding and actuation : a thesis presented in partial fulfilment of the requirements for the degree of Master of Engineering in Mechatronics, School of Engineering and Advanced Technology, Massey University, Albany, New Zealand . [Thesis]. Massey University; 2011. Available from: http://hdl.handle.net/10179/2470

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

20. SEE HIAN HIAN. LOCALIZED MANIPULATION OF MAGNETIC MICRO-PARTICLES.

Degree: 2018, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/148571

Subjects/Keywords: localized magnetic force; localized manipulation; magnetic actuation; localized mechanical stimulus; extracellular matrix; mechanobiology

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APA (6^th Edition):

HIAN, S. H. (2018). LOCALIZED MANIPULATION OF MAGNETIC MICRO-PARTICLES. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/148571

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

HIAN, SEE HIAN. “LOCALIZED MANIPULATION OF MAGNETIC MICRO-PARTICLES.” 2018. Thesis, National University of Singapore. Accessed March 01, 2021. http://scholarbank.nus.edu.sg/handle/10635/148571.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

HIAN, SEE HIAN. “LOCALIZED MANIPULATION OF MAGNETIC MICRO-PARTICLES.” 2018. Web. 01 Mar 2021.

Vancouver:

HIAN SH. LOCALIZED MANIPULATION OF MAGNETIC MICRO-PARTICLES. [Internet] [Thesis]. National University of Singapore; 2018. [cited 2021 Mar 01]. Available from: http://scholarbank.nus.edu.sg/handle/10635/148571.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

HIAN SH. LOCALIZED MANIPULATION OF MAGNETIC MICRO-PARTICLES. [Thesis]. National University of Singapore; 2018. Available from: http://scholarbank.nus.edu.sg/handle/10635/148571

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

21. Ghosh, Arijit. Dynamics, Fluctuations and Rheological Applications of Magnetic Nanopropellers.

Degree: PhD, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/2984

► Micron scale robots going inside our body and curing various ailments is a technolog¬ical dream that easily captures our imagination. However, with the advent of… (more)

▼ Micron scale robots going inside our body and curing various ailments is a technolog¬ical dream that easily captures our imagination. However, with the advent of novel nanofabrication and nanocharacterization tools there has been a surge in the research in this ﬁeld over the last decade. In order to achieve locomotion (swim) at these small length scales, special strategies need to be adopted, that is able to overcome the large viscous damping that these microbots have to face while moving in the various bod¬ily ﬂuids. Thus researchers have looked into the swimming strategies found in nature like that of bacteria like E.coli found in our gut or spermatozoa in the reproductive mucus. Biomimetic swimmers that replicate the motion of these small microorganisms hold tremendous promise in a host of biomedical applications like targeted drug delivery, microsurgery, biochemical sensing and disease diagnosis. In one such method of swimming at very low Reynolds numbers, a micron scale helix has been fabricated and rendered magnetic by putting a magnetic material on it. Small rotating magnetic ﬁelds could be used then to rotate the helix, which translated as a result of the intrinsic translation rotation coupling in a helix. The present work focussed on the development of such a system of nanopropellers, a few microns in length, the characterization of its dynamics and velocity ﬂuctuations originating from thermal noise. The work has also showed a possible application of the nanopropellers in microrheology where it could be used as a new tool to measure the rheological characteristics of a complex heterogeneous environment with very high spatial and temporal resolutions. A generalized study of the dynamics of these propellers under a rotating ﬁeld, has showed the existence of a variety of diﬀerent dynamical conﬁgurations. Rigid body dynamics simulations have been carried out to understand the behaviour. Signiﬁcant amount of insight has been gained by solving the equations of motion of the object analytically and it has helped to obtain a complete understanding, along with providing closed form expressions of the various characteristics frequencies and parameters that has deﬁned the motion. A study of the velocity ﬂuctuations of these chiral nanopropellers has been carried out, where the nearby wall of the microﬂuidic cell was found to have a dominant eﬀect on the ﬂuctuations. The wall has been found to enhance the average level of ﬂuctuations apart from bringing in signiﬁcant non Gaussian eﬀects. The experimentally obtained ﬂuctuations has been corroborated by a simulation in which a time evolution study of the governing 3D Langevin dynamics equations has been done. A closer look at the various sources of velocity ﬂuctuations and a causality study thereof has brought out a minimum length scale below which helical propulsion has become impractical to achieve because of the increased eﬀect of the orientational ﬂuctuations of the propeller at those small length scales. An interesting bistable dynamics of the propeller has been… Advisors/Committee Members: Ghosh, Ambarish (advisor).

Subjects/Keywords: Magnetic Nanopropellers; Nanopropeller Dynamics; Micron Scale Helix; Biomimetic Swimmers; Nanoscale Swimmers; Helical Propulsion Theory; Nanopropeller Actuation; Microswimmers(Propellers); Helical Nanoswimmers; Microrheology; Helical Propulsion; Helical Nanostructures; Nanotechnology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ghosh, A. (2018). Dynamics, Fluctuations and Rheological Applications of Magnetic Nanopropellers. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2984

Chicago Manual of Style (16^th Edition):

Ghosh, Arijit. “Dynamics, Fluctuations and Rheological Applications of Magnetic Nanopropellers.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed March 01, 2021. http://etd.iisc.ac.in/handle/2005/2984.

MLA Handbook (7^th Edition):

Ghosh, Arijit. “Dynamics, Fluctuations and Rheological Applications of Magnetic Nanopropellers.” 2018. Web. 01 Mar 2021.

Vancouver:

Ghosh A. Dynamics, Fluctuations and Rheological Applications of Magnetic Nanopropellers. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Mar 01]. Available from: http://etd.iisc.ac.in/handle/2005/2984.

Council of Science Editors:

Ghosh A. Dynamics, Fluctuations and Rheological Applications of Magnetic Nanopropellers. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/2984

University of Illinois – Urbana-Champaign

22. Somnath, Suhas. Fundamentals of heat transfer and thermal-mechanical control for improved atomic force microscopy.

Degree: PhD, 0133, 2014, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/50358

► This dissertation presents novel atomic force microscope (AFM) cantilevers and cantilever technology that improve the measurement rate and precision of AFM. AFM cantilevers with integrated… (more)

▼ This dissertation presents novel atomic force microscope (AFM) cantilevers and cantilever technology that improve the measurement rate and precision of AFM. AFM cantilevers with integrated heater-thermometers can generate and sense heat flows to measure and manipulate matter at the nanometer scale. These heated cantilevers have been used for local measurements of material properties, tip-based nanomanufacturing, high-density data storage, and thermal topography imaging. This work focuses on thermal topography imaging wherein the cantilever measures the surface topography by tracking changes in the cantilever heat flow. This work shows the experimental and numerical investigation of cantilever heat transfer to substrates. The investigations show that the cantilever measures the topography height regardless of the substrate material properties. The lateral heat flow from the cantilever varies with the topography dimensions and causes the thermal topography to differ from the actual substrate topography. Insights from these investigations reveal a technique that corrects the thermal topography by eliminating most of the lateral heat flow from the cantilever. Arrays of cantilevers can significantly improve the measurement area and speed of AFM but array technology has been mostly inaccessible due to the need for specialized hardware. This dissertation reports the scalable integration of an array of 5 heated cantilevers into a commercial AFM using simple hardware and software. Cantilever temperatures are controlled in closed-loop feedback with 2 ˚C accuracy and 0.1 ˚C precision using analog circuitry rated at 1 MHz bandwidth. Analog cantilever temperature control is autonomous, inexpensive, scalable, and fast compared to conventional software implementations. The cantilever array performs parallel AFM imaging of a 550 µm × 90 µm area at 1.1 mm/sec with 0.6 nm vertical resolution and at 4.0 mm/sec with 44 nm wide pixels. The measurement rate was improved by more than 2 orders of magnitude compared to conventional AFM with a single cantilever. To demonstrate the ability to manufacture and repair nanostructures, the array performs multiple iterations of parallel nanolithography and topography imaging. Heated cantilevers are limited in their ability to precisely measure and control tip-sample forces due to parasitic resonances introduced by conventional piezoelectric actuators. This dissertation presents the development of two heated cantilevers designed for electromagnetic Lorentz force actuation. Electrical current passing through a U-shaped cantilever in the presence of a magnetic field induces a Lorentz force on the cantilever free end, resulting in cantilever actuation. These Lorentz-thermal cantilevers generate up to 7X larger Lorentz force and 2X larger oscillation amplitude compared to the state-of-art heated cantilevers. When used for thermal topography imaging, the Lorentz-thermal cantilevers can measure topography with vertical resolution of 0.2 nm. Advisors/Committee Members: King, William P. (advisor), King, William P. (Committee Chair), Ferreira, Placid M. (committee member), Cahill, David G. (committee member), Pop, Eric (committee member).

Subjects/Keywords: Atomic Force Microscopy (AFM); heated cantilever; heat transfer; simulation; array; temperature control; magnetic actuation; Lorentz force; parallel imaging; thermomechanical lithography; scanning thermal microscopy; nanotopography; tapping-mode atomic force microscopy (AFM)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Somnath, S. (2014). Fundamentals of heat transfer and thermal-mechanical control for improved atomic force microscopy. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/50358

Chicago Manual of Style (16^th Edition):

Somnath, Suhas. “Fundamentals of heat transfer and thermal-mechanical control for improved atomic force microscopy.” 2014. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed March 01, 2021. http://hdl.handle.net/2142/50358.

MLA Handbook (7^th Edition):

Somnath, Suhas. “Fundamentals of heat transfer and thermal-mechanical control for improved atomic force microscopy.” 2014. Web. 01 Mar 2021.

Vancouver:

Somnath S. Fundamentals of heat transfer and thermal-mechanical control for improved atomic force microscopy. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2014. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/2142/50358.

Council of Science Editors:

Somnath S. Fundamentals of heat transfer and thermal-mechanical control for improved atomic force microscopy. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2014. Available from: http://hdl.handle.net/2142/50358

The Ohio State University

23. Lauback, Stephanie Diane. Magnetic Actuation of Biological Systems.

Degree: PhD, Physics, 2017, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1494262695434601

► Central to the advancement of many biomedical and nanotechnology capabilities is the capacity to precisely control the motion of micro and nanostructures. These applications range… (more)

▼ Central to the advancement of many biomedical and nanotechnology capabilities is the capacity to precisely control the motion of micro and nanostructures. These applications range from single molecule experiments to cell isolation and separation, to drug delivery and nanomachine manipulation. This dissertation focuses on actuation of biological micro- and nano-entities through the use of weak external magnetic fields, superparamagnetic beads, and ferromagnetic thin films. The magnetic platform presents an excellent method for actuation of biological systems due to its ability to directly control the motion of an array of micro and nanostructures in real-time with calibrated picoNewton forces. The energy landscape of two ferromagnetic thin film patterns (disks and zigzag wires) is experimentally explored and compared to corresponding theoretical models to quantify the applied forces and trajectories of superparamagnetic beads due to the magnetic traps. A magnetic method to directly actuate DNA nanomachines in real-time with nanometer resolution and sub-second response times using micromagnetic control was implemented through the use of stiff DNA micro-levers which bridged the large length scale mismatch between the micro-actuator and the nanomachine. Compared to current alternative methods which are limited in the actuation speeds and the number of reconfiguration states of DNA constructs, this magnetic approach enables fast actuation (~ milliseconds) and reconfigurable conformations achieved through a continuous range of finely tuned steps. The system was initially tested through actuation of the stiff arm tethered to the surface, and two prototype DNA nanomachines (rotor and hinge) were successfully actuated using the stiff mechanical lever. These results open new possibilities in the development of functional robotic systems at the molecular scale. In exploiting the use of DNA stiff levers, a new technique was also developed to investigate the emergence of the magnetization of individual superparamagnetic beads as a function of the applied field. Last, since proteins are frequently used for surface adhesion in assembling biomedical devices, preliminary tests were implemented to dynamically pattern proteins on a substrate using transformed E. coli that are magnetically labeled Advisors/Committee Members: Sooryakumar, Ratnasingham (Advisor).

Subjects/Keywords: Physics; micromagnetic actuation, DNA origami, hinge, rotor, lever arm, real-time, magnetization, permanent moment, anisotropic induced moment, easy axis MyOne Dynabeads, energy landscape, patterned magnetic thin films, E coli

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lauback, S. D. (2017). Magnetic Actuation of Biological Systems. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1494262695434601

Chicago Manual of Style (16^th Edition):

Lauback, Stephanie Diane. “Magnetic Actuation of Biological Systems.” 2017. Doctoral Dissertation, The Ohio State University. Accessed March 01, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1494262695434601.

MLA Handbook (7^th Edition):

Lauback, Stephanie Diane. “Magnetic Actuation of Biological Systems.” 2017. Web. 01 Mar 2021.

Vancouver:

Lauback SD. Magnetic Actuation of Biological Systems. [Internet] [Doctoral dissertation]. The Ohio State University; 2017. [cited 2021 Mar 01]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1494262695434601.

Council of Science Editors:

Lauback SD. Magnetic Actuation of Biological Systems. [Doctoral Dissertation]. The Ohio State University; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1494262695434601

University of Maryland

24. Zhao, Peng. Magnetoelastic Coupling in NiMnGa Ferromagnetic Shape Memory Alloy.

Degree: Material Science and Engineering, 2006, University of Maryland

URL: http://hdl.handle.net/1903/4129

► NiMnGa alloys have attracted extensive attention because their ferromagnetic characteristic provides an additional degree of freedom to control both the shape memory effect and the… (more)

▼ NiMnGa alloys have attracted extensive attention because their ferromagnetic characteristic provides an additional degree of freedom to control both the shape memory effect and the multi-stage phase transformations in this Heusler system. Technically, along with the large magnetic-field-induced strains, NiMnGa alloys exhibit giant magnetocaloric effect due to their magnetic entropy changes associated with the coupled magnetostructural transitions. Fundamentally, a sequence of phase transformations, manifesting itself by a rich variety of physical anomalies on cooling to the martensitic transformation (MT) temperature TM, has been established. However, in comparison to the intensive studies of structural transformations, the magnetic properties of NiMnGa premartensite were hardly touched. The purpose of this research is to i) investigate the temperature dependence of the magnetic driving force of martensitic NiMnGa, which is a critical factor to determine the actuation temperature window of this material; and ii) understand the magnetoelastic coupling enhanced precursor effects, especially the unique magnetic behavior of NiMnGa premartensite. The singular point detection technique has been applied to determine the magnetic anisotropy constant K1 of a martensitic Ni49.0Mn23.5Ga27.5 (wt%) crystal. As expected, K1 increases with decreasing temperatures below TM of 276 K, following a magnetization power law K1(T)/K1(0)=(Ms(T)/Ms(0))3. However, the force required to initiate twin boundary motion increases exponentially with decreasing temperature. The combination of both temperature dependences leads to a very restricted temperature window for magnetic actuation using this alloy. The premartensitic transformation has been established by means of neutron powder diffraction and measurements of elastic constants of C44 and C'. The premartensitic phase has been verified by the stiffening of C44 prior to the MT. The slope change of C' at TC positively confirms that the precursor phenomena are enhanced by the magnetoelastic coupling. Magnetic Ni49.0Mn23.5Ga27.5 premartensite is characterized by the coexistence of a finite dc magnetic susceptibility and a vanishing magnetocrystalline anisotropy, distinguishing bcc NiMnGa from the typical magnetic soft materials. This property arises from the competition between the exchange forces of the host lattice and the strong local crystal fields stemming from the tweed. Advisors/Committee Members: Wuttig, Manfred (advisor).

Subjects/Keywords: Engineering, Materials Science; shape memory alloy; magnetic materials; magnetic anisotropy; actuation field; premartensite; martensitic transformation.

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APA (6^th Edition):

Zhao, P. (2006). Magnetoelastic Coupling in NiMnGa Ferromagnetic Shape Memory Alloy. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/4129

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhao, Peng. “Magnetoelastic Coupling in NiMnGa Ferromagnetic Shape Memory Alloy.” 2006. Thesis, University of Maryland. Accessed March 01, 2021. http://hdl.handle.net/1903/4129.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhao, Peng. “Magnetoelastic Coupling in NiMnGa Ferromagnetic Shape Memory Alloy.” 2006. Web. 01 Mar 2021.

Vancouver:

Zhao P. Magnetoelastic Coupling in NiMnGa Ferromagnetic Shape Memory Alloy. [Internet] [Thesis]. University of Maryland; 2006. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1903/4129.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhao P. Magnetoelastic Coupling in NiMnGa Ferromagnetic Shape Memory Alloy. [Thesis]. University of Maryland; 2006. Available from: http://hdl.handle.net/1903/4129

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Cincinnati

25. CHO, HYOUNG JIN. MICROMACHINED PERMANENT MAGNETS AND THEIR MEMS APPLICATIONS.

Degree: PhD, Engineering : Electrical Engineering, 2002, University of Cincinnati

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1014839747

► In this research, new micromachined permanent magnets have been proposed, developed and characterized for MEMS applications. In realizing micromachined permanent magnets, a new electroplating technique… (more)

▼ In this research, new micromachined permanent magnets have been proposed, developed and characterized for MEMS applications. In realizing micromachined permanent magnets, a new electroplating technique using external magnetic field and a bumper filling technique using a photolithographically defined mold with resin bonded magnetic particles have been developed. The newly developed micromachining techniques allow thick film-type permanent magnet components to be integrated to magnetic MEMS devices with dimensional control and alignment. Permanent magnet arrays with the dimensions ranging from 30 micrometers to 200 micrometers have been developed with an energy density up to 2.7 kJ/m ³ in precisely defined forms in the micro scale. For the applications of the permanent magnets developed in this work, three novel magnetic MEMS devices such as a bi-directional magnetic actuator, a magnetically driven optical scanner, and a magnetic cell separator have been successfully realized. After design and modeling, each device has been fabricated and fully characterized. The bi-directional actuator with the electroplated permanent magnet array has achieved bi- directional motion clearly and shown good agreement with the analytical and simulated models. The optical scanner has shown linear bi-directional response under static actuation and stable bi-directional scanning performance under dynamic actuation. As a potential BioMEMS application of the developed permanent magnet, the prototype magnetic cell separator using the electroplated permanent magnet strip array has been proposed and demonstrated for magnetic bead patterning. In conclusion, new thick film-type, electroplated CoNiMnP and epoxy resin bonded Sr-ferrite permanent magnets have been developed and characterized, and then, three new magnetic MEMS devices using the permanent magnets such as a bi-directional magnetic actuator, an optical scanner and a magnetic cell separator have been realized in this research. The new micromachined permanent magnets, fabrication techniques and the new devices in this work can be applied to many MEMS devices that demand a constant magnetic field source and large bi-directional actuation, in the areas of light beam, flow and biological cell handling. Advisors/Committee Members: Ahn, Dr. Chong H. (Advisor).

Subjects/Keywords: magnetic mems; micromachined magnetic microactuator; micromachined optical scanner; micromachined permanent magnet; bi-directional actuation

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APA (6^th Edition):

CHO, H. J. (2002). MICROMACHINED PERMANENT MAGNETS AND THEIR MEMS APPLICATIONS. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1014839747

Chicago Manual of Style (16^th Edition):

CHO, HYOUNG JIN. “MICROMACHINED PERMANENT MAGNETS AND THEIR MEMS APPLICATIONS.” 2002. Doctoral Dissertation, University of Cincinnati. Accessed March 01, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1014839747.

MLA Handbook (7^th Edition):

CHO, HYOUNG JIN. “MICROMACHINED PERMANENT MAGNETS AND THEIR MEMS APPLICATIONS.” 2002. Web. 01 Mar 2021.

Vancouver:

CHO HJ. MICROMACHINED PERMANENT MAGNETS AND THEIR MEMS APPLICATIONS. [Internet] [Doctoral dissertation]. University of Cincinnati; 2002. [cited 2021 Mar 01]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1014839747.

Council of Science Editors:

CHO HJ. MICROMACHINED PERMANENT MAGNETS AND THEIR MEMS APPLICATIONS. [Doctoral Dissertation]. University of Cincinnati; 2002. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1014839747

University of Houston

26. Von Sternberg, Nicholas Craig 1986-. Novel Core Technologies and Systems for Magnetic Resonance Compatible Robotics.

Degree: PhD, Robotics, University of Houston

URL: http://hdl.handle.net/10657/4097

► This dissertation presents design and validation of several systems and technologies for magnetic resonance imaging (MRI) compatible positioning. The research began as the development of… (more)

Subjects/Keywords: MRI-compatible robotics; MR Compatible Actuation; Solid Media Flexible Transmission; Robotic Surgery; Magnetic resonance imaging

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APA (6^th Edition):

Von Sternberg, N. C. 1. (n.d.). Novel Core Technologies and Systems for Magnetic Resonance Compatible Robotics. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/4097

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Chicago Manual of Style (16^th Edition):

Von Sternberg, Nicholas Craig 1986-. “Novel Core Technologies and Systems for Magnetic Resonance Compatible Robotics.” Doctoral Dissertation, University of Houston. Accessed March 01, 2021. http://hdl.handle.net/10657/4097.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

MLA Handbook (7^th Edition):

Von Sternberg, Nicholas Craig 1986-. “Novel Core Technologies and Systems for Magnetic Resonance Compatible Robotics.” Web. 01 Mar 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Von Sternberg NC1. Novel Core Technologies and Systems for Magnetic Resonance Compatible Robotics. [Internet] [Doctoral dissertation]. University of Houston; [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10657/4097.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Council of Science Editors:

Von Sternberg NC1. Novel Core Technologies and Systems for Magnetic Resonance Compatible Robotics. [Doctoral Dissertation]. University of Houston; Available from: http://hdl.handle.net/10657/4097

Note: this citation may be lacking information needed for this citation format:
No year of publication.

University of Cambridge

27. Katsamba, Panayiota. Biophysics of helices : devices, bacteria and viruses.

Degree: PhD, 2018, University of Cambridge

URL: https://doi.org/10.17863/CAM.30371 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763566

► A prevalent morphology in the microscopic world of artificial microswimmers, bacteria and viruses is that of a helix. The intriguingly different physics at play at… (more)

▼ A prevalent morphology in the microscopic world of artificial microswimmers, bacteria and viruses is that of a helix. The intriguingly different physics at play at the small scale level make it necessary for bacteria to employ swimming strategies different from our everyday experience, such as the rotation of a helical filament. Bio-inspired microswimmers that mimic bacterial locomotion achieve propulsion at the microscale level using magnetically actuated, rotating helical filaments. A promising application of these artificial microswimmers is in non-invasive medicine, for drug delivery to tumours or microsurgery. Two crucial features need to be addressed in the design of microswimmers. First, the ability to selectively control large ensembles and second, the adaptivity to move through complex conduit geometries, such as the constrictions and curves of the tortuous tumour microvasculature. In this dissertation, a mechanics-based selective control mechanism for magnetic microswimmers is proposed, and a model and simulation of an elastic helix passing through a constricted microchannel are developed. Thereafter, a theoretical framework is developed for the propulsion by stiff elastic filaments in viscous fluids. In order to address this fluid-structure problem, a pertubative, asymptotic, elastohydrodynamic approach is used to characterise the deformation that arises from and in turn affects the motion. This framework is applied to the helical filaments of bacteria and magnetically actuated microswimmers. The dissertation then turns to the sub-bacterial scale of bacteriophage viruses, 'phages' for short, that infect bacteria by ejecting their genetic material and replicating inside their host. The valuable insight that phages can offer in our fight against pathogenic bacteria and the possibility of phage therapy as an alternative to antibiotics, are of paramount importance to tackle antibiotics resistance. In contrast to typical phages, flagellotropic phages first attach to bacterial flagella, and have the striking ability to reach the cell body for infection, despite their lack of independent motion. The last part of the dissertation develops the first theoretical model for the nut-and-bolt mechanism (proposed by Berg and Anderson in 1973). A nut being rotated will move along a bolt. Similarly, a phage wraps itself around a flagellum possessing helical grooves, and exploits the rotation of the flagellum in order to passively travel along and towards the cell body, according to this mechanism. The predictions from the model agree with experimental observations with respect to directionality, speed and the requirements for succesful translocation.

Subjects/Keywords: 571.4; helix; bacteria; virus; phage; bacteriophage; microswimmer; filament; slender; selective control; magnetic actuation; propulsion; application-driven design; elasticity; elastohydrodynamics; fluid-structure interaction; constriction; complex conduit; adaptive design; deformation; nut-and-bolt mechanism; flagellotropic; flagellum; bacterium; translocation; microscale; fluid mechanics; artificial-microswimmer; deformation feedback to kinematics; swimming; device; targeted-drug delivery; microfluidics; micromanipulation; minimally-invasive medical applications; biophysics; mechanics; biomechanics

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APA (6^th Edition):

Katsamba, P. (2018). Biophysics of helices : devices, bacteria and viruses. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.30371 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763566

Chicago Manual of Style (16^th Edition):

Katsamba, Panayiota. “Biophysics of helices : devices, bacteria and viruses.” 2018. Doctoral Dissertation, University of Cambridge. Accessed March 01, 2021. https://doi.org/10.17863/CAM.30371 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763566.

MLA Handbook (7^th Edition):

Katsamba, Panayiota. “Biophysics of helices : devices, bacteria and viruses.” 2018. Web. 01 Mar 2021.

Vancouver:

Katsamba P. Biophysics of helices : devices, bacteria and viruses. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2021 Mar 01]. Available from: https://doi.org/10.17863/CAM.30371 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763566.

Council of Science Editors:

Katsamba P. Biophysics of helices : devices, bacteria and viruses. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://doi.org/10.17863/CAM.30371 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763566

The Ohio State University

28. Gobbalipur Ranganath, Jayanth. Multi-axis probing system for nano-metrology.

Degree: PhD, Mechanical Engineering, 2009, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1229908979

► Atomic force microscopy has been the primary workhorse for imaging and manipulating samples with sub-nanometer resolution and pico-Newton scale force resolution. It has found… (more)

▼ Atomic force microscopy has been the primary workhorse for imaging and manipulating samples with sub-nanometer resolution and pico-Newton scale force resolution. It has found applications in such diverse fields as biology, chemistry, engineering, medicine, and physics. The central feature of atomic force microscopy (AFM) is its probing system that detects the near-field physical interactions between the probe tip and the sample. In principle, 3D forces can be detected and controlled. However, the overwhelming majority of the applications of AFM, in every field where it is used, are on samples which are very nearly planar and horizontal. The primary reason for this severe constraint on the possible samples that can be imaged or manipulated by AFM is due to the geometry of the probe. In this research, the design, actuation, and control of a novel multi-axis probing system, which can simultaneously control the tip position and tip orientation, and which enables imaging and manipulation of samples having three-dimensional geometries, is investigated. It can change the orientation of the tip according to the surface normal of the sample, and thus precisely control the tip-sample interaction point when imaging surfaces having large topographic variations. It leads to the creation of a multi-axis probing system for nano-metrology, which is a three-dimensional (3D) surface tool rather than a two-dimensional (2D) planar surface tool. In order to fully develop the probing system, two more innovations are proposed. Firstly, a multi-axes scanning scheme is developed in order to align the directions of scanning and interaction control depending on the local surface orientation. Secondly, a tip-sample interaction scheme is proposed that regulates the direction of the tip-sample interaction while minimizing the effect of lateral friction. A robust control scheme is implemented in combination with these proposed developments, which commands the tip to track orientation changes of the sample surface when imaging 3D samples. The integrated system possesses two unique features, namely, multi-axis control of tip and scanning operation and the capability to interact with 3D surfaces in a gentle, controlled manner. The probing system is evaluated by imaging a variety of engineered 3D surfaces. The result of scanning a micro-pipette of diameter 2.4µm using this tool is presented and discussed. Advisors/Committee Members: Menq, Chia-Hsiang (Advisor).

Subjects/Keywords: Mechanical Engineering; nano-metrology; multi-axis compliant manipulator; magnetic actuation; real-time tip orientation control; two-axis scanning; two-axis tip-sample interaction control

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APA (6^th Edition):

Gobbalipur Ranganath, J. (2009). Multi-axis probing system for nano-metrology. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1229908979

Chicago Manual of Style (16^th Edition):

Gobbalipur Ranganath, Jayanth. “Multi-axis probing system for nano-metrology.” 2009. Doctoral Dissertation, The Ohio State University. Accessed March 01, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1229908979.

MLA Handbook (7^th Edition):

Gobbalipur Ranganath, Jayanth. “Multi-axis probing system for nano-metrology.” 2009. Web. 01 Mar 2021.

Vancouver:

Gobbalipur Ranganath J. Multi-axis probing system for nano-metrology. [Internet] [Doctoral dissertation]. The Ohio State University; 2009. [cited 2021 Mar 01]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1229908979.

Council of Science Editors:

Gobbalipur Ranganath J. Multi-axis probing system for nano-metrology. [Doctoral Dissertation]. The Ohio State University; 2009. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1229908979

29. McPherson, Timothy Steven. A force and displacement self-sensing method for a mri compatible tweezer end effector.

Degree: MS, Mechanical Engineering, 2012, Georgia Tech

URL: http://hdl.handle.net/1853/44829

► This work describes a self-sensing technique for a piezoelectrically driven MRI-compatible tweezer style end effector, suitable for robot assisted, MRI guided surgery. Nested strain amplification… (more)

Subjects/Keywords: Piezoelectric actuation; Self sensing; Robotics; MRI compatible; Surgical instruments and apparatus; Robotics in medicine; Computer-assisted surgery; Piezoelectricity; Surgical robots; Magnetic resonance imaging

…sensor and an actuator, preserving the full actuation capability of the device. Experimental… …Surgical Inc. [12]. Concurrently, research has been undertaken in magnetic resonance… …invasive way. To that end, the investigation of new actuation and sensing strategies that are MRI… …Due to its ceramic nature it has low magnetic susceptibility, making it a good choice for… …the full actuation capability. It also reduces the device’s complexity and lowers its cost…

10 more images…

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APA (6^th Edition):

McPherson, T. S. (2012). A force and displacement self-sensing method for a mri compatible tweezer end effector. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/44829

Chicago Manual of Style (16^th Edition):

McPherson, Timothy Steven. “A force and displacement self-sensing method for a mri compatible tweezer end effector.” 2012. Masters Thesis, Georgia Tech. Accessed March 01, 2021. http://hdl.handle.net/1853/44829.

MLA Handbook (7^th Edition):

McPherson, Timothy Steven. “A force and displacement self-sensing method for a mri compatible tweezer end effector.” 2012. Web. 01 Mar 2021.

Vancouver:

McPherson TS. A force and displacement self-sensing method for a mri compatible tweezer end effector. [Internet] [Masters thesis]. Georgia Tech; 2012. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1853/44829.

Council of Science Editors:

McPherson TS. A force and displacement self-sensing method for a mri compatible tweezer end effector. [Masters Thesis]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/44829

30. Becker, Aaron. Ensemble control of robotic systems.

Degree: PhD, 1200, 2012, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/34221

► In this dissertation, we apply the framework of ensemble control theory to derive an approximate steering algorithm for two classical robotic systems – the nonholonomic unicycle… (more)

▼ In this dissertation, we apply the framework of ensemble control theory to derive an approximate steering algorithm for two classical robotic systems – the nonholonomic unicycle and the plate-ball manipulator – in the presence of model perturbation that scales all inputs by an unknown but bounded constant. The basic idea is to maintain the set of all possible configurations and to select inputs that reduce the size of this set and drive it toward some goal configuration. The key insight is that the evolution of this set can be described by a family of control systems that depend continuously on the unknown constant. Ensemble control theory provides conditions under which it is possible to steer this entire family to a neighborhood of the goal configuration with a single open-loop input trajectory. For both the nonholonomic unicycle and the plate-ball manipulator, we show how to construct this trajectory using piecewise-constant inputs. We also validate our approach with hardware experiments, where the nonholonomic unicycle is a differential-drive robot with unknown wheel size, and the plate-ball manipulator is a planar motion stage that uses magnetic actuation to orient a sphere of unknown radius. We conclude by showing how the same framework can be applied to feedback control of multi-robot systems under the constraint that every robot receives exactly the same control input. We focus on the nonholonomic unicycle, instantiated in experiment by a collection of differential-drive robots. Assuming that each robot has a unique wheel size, we derive a globally asymptotically stabilizing feedback control policy. We show that this policy is robust to standard models of noise and scales to an arbitrary number of robots. These results suggest that our approach may have possible future application to control of micro- and nano-scale robotic systems, which are often subject to similar constraints. Advisors/Committee Members: Bretl, Timothy W. (advisor), Bretl, Timothy W. (Committee Chair), Hutchinson, Seth A. (committee member), Liberzon, Daniel M. (committee member), Domínguez-García, Alejandro D. (committee member).

Subjects/Keywords: ensemble control; robot; nonholonomic unicycle; plate-ball manipulator; motion planning; robotics; micro/nano robot; micro robot; nano robot; nonholonomic; perturbed parameter; open-loop control; approximate steering; robot motion planning; robust control; robot continuum; model perturbation; robotics; kinematic unicycle; globally asymptotic stabilization; global asymptotic stablility (GAS); control Lyapunov; planar motion stage; magnetic actuation; sphere orient; reorientation; nonholonomic system; feedback control policy; underactuated; underactuation; multi-robot; uniform control input; differential-drive robot; robust control; control theory

…accelerator using applied magnetic fields [16]. The more recent work of Brockett, Khaneja… …nuclear spins in nuclear magnetic resonance (NMR) spectroscopy [3–10]…

10 more images…

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APA (6^th Edition):

Becker, A. (2012). Ensemble control of robotic systems. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/34221

Chicago Manual of Style (16^th Edition):

Becker, Aaron. “Ensemble control of robotic systems.” 2012. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed March 01, 2021. http://hdl.handle.net/2142/34221.

MLA Handbook (7^th Edition):

Becker, Aaron. “Ensemble control of robotic systems.” 2012. Web. 01 Mar 2021.

Vancouver:

Becker A. Ensemble control of robotic systems. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2012. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/2142/34221.

Council of Science Editors:

Becker A. Ensemble control of robotic systems. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/34221

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Open Access Theses and Dissertations