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Artículos de revistas sobre el tema "Novel Magnetic Systems"

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Autor: Grafiati

Publicado: 7 de septiembre de 2023

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1

Inomata, A., J. S. Jiang, C. Y. You, J. E. Pearson y S. D. Bader. "Magnetic stability of novel exchange coupled systems". Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 18, n.º 4 (julio de 2000): 1269–72. http://dx.doi.org/10.1116/1.582338.

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2

Böse, Holger y Johannes Ehrlich. "Novel Adaptive Damping Systems Based on Magnetorheological Fluids". Advances in Science and Technology 77 (septiembre de 2012): 86–95. http://dx.doi.org/10.4028/www.scientific.net/ast.77.86.

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Adaptive damping systems based on magnetorheological (MR) fluids allow the continuous control of vibration damping forces depending on the current conditions. In magnetorheological dampers known so far, the magnetic field for the control of the MR fluid is generated by the coil of an electromagnet. Two novel concepts for the magnetic circuit in magnetorheological dampers have been proven where hybrid magnetic circuits consisting of at least one permanent or hard magnet and an electromagnet are used. In the first concept, the electromagnet is combined with two permanent magnets, whose magnetization cannot be modified even by strong magnetic fields of the electromagnet. The main advantage of this configuration is the improved fail-safe behaviour of the damper in case of a power failure. In the second approach, the electromagnet is combined with a hard magnet, whose magnetization can be modified by the electromagnet. This configuration leads to high energy efficiency, because electric power is only required in short pulses for the switching of the hard magnet. Magnetic circuits with the combination of different magnetic field sources were designed supported by simulations of the magnetic flux distribution. Demonstration models for magnetorheological dampers with the distinguished magnetic circuits were constructed and their performances were tested. The results of the investigations are described in this contribution.

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3

Allia, Paolo, Marco Coisson, Vincenzo Selvaggini, Paola Tiberto y Franco Vinai. "Novel aspects of magnetoresistance in nanogranular magnetic systems". Journal of Magnetism and Magnetic Materials 262, n.º 1 (mayo de 2003): 47–51. http://dx.doi.org/10.1016/s0304-8853(03)00016-7.

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4

Shchukin, D. G., D. V. Sviridov y A. I. Kulak. "Magnetorheological photocatalytic systems". International Journal of Photoenergy 1, n.º 2 (1999): 65–67. http://dx.doi.org/10.1155/s1110662x99000124.

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Preparation and properties of a novel photocatalytic system containing magnetic cores coated with subsequently applied silica and titania shells are discussed. The underlying idea is to impart magnetic properties to the semiconductor particles that permits to control the rheological properties of the photocatalyst dispersion and makes possible its separation from treated solution without invoking procedures of filtration or centrifugation. Preparation route yielding photoactive titania coating and silica interlayer, which prevents the undesirable doping of catalyst and parasitic charge exchange between titania shell and magnetic core, is described in detail.

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5

Cambel, Vladimír, Goran Karapetrov, Valentyn Novosad, Elena Bartolomé, Dagmar Gregušová, Ján Fedor, Robert Kúdela y Ján Šoltýs. "Novel Hall sensors developed for magnetic field imaging systems". Journal of Magnetism and Magnetic Materials 316, n.º 2 (septiembre de 2007): 232–35. http://dx.doi.org/10.1016/j.jmmm.2007.02.104.

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6

Chhetri, Tilak, Gary Cunningham, Dhananjay Suresh, Bruce Shanks, Raghuraman Kannan, Anandhi Upendran y Zahra Afrasiabi. "Wastewater Treatment Using Novel Magnetic Nanosponges". Water 14, n.º 3 (8 de febrero de 2022): 505. http://dx.doi.org/10.3390/w14030505.

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Modern agricultural activities and concentrated animal feeding operations (CAFOs) are two of the major sources of groundwater contamination that affect the quality of drinking water. Conventional water quality improvement methods include direct filtration, coagulation/settling treatment techniques, membrane-based systems, and absorption-based systems. However, to date, there are no efficient and cost-effective processes available for water treatment. This study developed an innovative nanotechnology-based technique to improve groundwater quality. Magnetic nanosponges (MNSs) were synthesized and characterized using two different magnetic nanoparticles along with polymeric coagulants. The efficiency of MNSs in removing pollutants in wastewater collected from local diary and swine CAFO lagoons was investigated. Standard water quality evaluation parameters, such as the total organic content (TOC), turbidity, total suspended solids (TSS), and biological oxygen demand (BOD), were measured prior to and after treatment with MNSs. The results demonstrate the potential of MNSs to improve the quality of groundwater and support the development of a cost-effective best management practice (BMP) that also employs traditional coagulants at CAFOs and other wastewater treatment plants.

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7

Rashidi, Hassan y Dara Pishdad. "Integrated Multispeed Magnetic Gears: A Novel Approach to Design of Magnetic Transmission Systems". IEEE Transactions on Magnetics 51, n.º 4 (abril de 2015): 1–8. http://dx.doi.org/10.1109/tmag.2014.2359639.

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8

Chen, Ke, Guangzu He, Qiong Tang y Qahtan A.Yousif. "One-Pot Access to Diverse Functionalized Pyran Annulated Heterocyclic Systems Using SCMNPs@BPy-SO3H as a Novel Magnetic Nanocatalyst". Bulletin of Chemical Reaction Engineering & Catalysis 15, n.º 2 (24 de marzo de 2020): 348–66. http://dx.doi.org/10.9767/bcrec.15.2.6693.348-366.

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The SCMNPs@BPy-SO3H catalyst was prepared and characterized using Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Vibrating Sample Magnetometry (VSM), Energy Dispersive X-ray Spectroscopy (EDX), X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM). Afterwards, its capability was efficiently used to promote the one-pot, three-component synthesis of pyrano[2,3-c]pyrazole and 2-amino-3-cyano-pyrano[3,2-c]chromen-5(4H)-one derivatives. The strategy resulted in the desired products with excellent yields and short reaction times. The SCMNPs@BPy-SO3H catalyst was readily recovered using a permanent magnetic field and it was reused in six runs with a slight decrease in catalytic activity. Copyright © 2020 BCREC Group. All rights reserved

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9

Cugat, O., G. Reyne, J. Delamare y H. Rostaing. "Novel magnetic micro-actuators and systems (MAGMAS) using permanent magnets". Sensors and Actuators A: Physical 129, n.º 1-2 (mayo de 2006): 265–69. http://dx.doi.org/10.1016/j.sna.2005.09.058.

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10

Brooks, N. R. y T. L. Baldwin. "Universal magnetic inversion scheme to design novel superconducting magnet systems". IEEE Transactions on Appiled Superconductivity 13, n.º 2 (junio de 2003): 1676–79. http://dx.doi.org/10.1109/tasc.2003.812861.

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11

Rau, Carl. "Studies of novel magnetic systems by electron capture spectroscopy (ECS)". Hyperfine Interactions 49, n.º 1-4 (junio de 1989): 407–22. http://dx.doi.org/10.1007/bf02405153.

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12

Crisan, Alina Daniela y Ovidiu Crisan. "Novel Rare Earth (RE)-Free Nanocomposite Magnets Derived from L10-Phase Systems". Nanomaterials 13, n.º 5 (1 de marzo de 2023): 912. http://dx.doi.org/10.3390/nano13050912.

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In the quest for novel rare earth (RE)-free magnetic materials, which also exhibit other additional properties such as good corrosion resistance and potential to operate at higher temperatures, an alloy deriving from the binary FePt system, with Mo and B addition, has been synthesized for the first time, using the out-of-equilibrium method of rapid solidification form the melt. The alloy with the composition Fe49Pt26Mo2B23 has been subjected to thermal analysis through differential scanning calorimetry in order to detect the structural disorder – order phase transformation as well as to study the crystallization processes. For the stabilization of the formed hard magnetic phase, the sample has been annealed at 600 °C and further structurally and magnetically characterized by means of X-ray diffraction, transmission electron microscopy, 57Fe Mössbauer spectrometry as well as magnetometry experiments. It has been proven that after annealing at 600 °C the tetragonal hard magnetic L10 phase emerges via crystallization from a disordered cubic precursor and becomes the predominant phase in terms of relative abundance. Moreover, it has been revealed by quantitative analysis via Mössbauer spectroscopy that the annealed sample exhibits a complex phase structure, where the L10 hard magnetic phase is accompanied by few other soft magnetic phases, in minority abundance: the cubic A1, orthorhombic Fe2B and residual intergranular region. The magnetic parameters have been derived from 300 K hysteresis loops. It was shown that, contrary to the as-cast sample which behaves as a typical soft magnet, the annealed sample presents strong coercivity and high remanent magnetization, accompanied by a large saturation magnetization. These findings offers good insight into the potential developing of novel class of RE-free permanent magnets, based on Fe-Pt-Mo-B, where the magnetic performance emerges from the co-existence of hard and soft magnetic phases in controlled and tunable proportions, capable of finding good applicability in fields requiring good catalytic properties and strong corrosion resistance.

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13

Valenzuela, Raúl. "Novel Applications of Ferrites". Physics Research International 2012 (15 de marzo de 2012): 1–9. http://dx.doi.org/10.1155/2012/591839.

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The applications of ferrimagnetic oxides, or ferrites, in the last 10 years are reviewed, including thin films and nanoparticles. The general features of the three basic crystal systems and their magnetic structures are briefly discussed, followed by the most interesting applications in electronic circuits as inductors, in high-frequency systems, in power delivering devices, in electromagnetic interference suppression, and in biotechnology. As the field is considerably large, an effort has been made to include the original references discussing each particular application on a more detailed manner.

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14

Chern, Gia-Wei. "Novel Magnetic Orders and Ice Phases in Frustrated Kondo-Lattice Models". SPIN 05, n.º 02 (junio de 2015): 1540006. http://dx.doi.org/10.1142/s2010324715400068.

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We review recent theoretical progress in our understanding of electron-driven novel magnetic phases on frustrated lattices. Our specific focus is on Kondo-lattice or double-exchange models assuming finite magnetic moments localized at the lattice sites. A salient feature of systems with SU(2) symmetric local moments is the emergence of noncoplanar magnetic ordering driven by the conduction electrons. The complex spin textures then endow the electrons a nontrivial Berry phase, often giving rise to a topologically nontrivial electronic state. The second part of the review is devoted to the discussion of metallic spin ice systems, which are essentially frustrated Ising magnets with local spin ordering governed by the so-called ice rules. These rules are similar to those that describe proton configurations in solid water ice, hence the name "spin ice". The nontrivial spin correlations in the ice phase give rise to unusual electron transport properties in metallic spin-ice systems.

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15

Thanh, Truong Quoc, Dinh Quang Truong, Nguyen Minh Tri y Kyoung Kwan Ahn. "Development of a Novel Linear Magnetic Actuator". International Journal of Automation Technology 8, n.º 6 (5 de noviembre de 2014): 864–73. http://dx.doi.org/10.20965/ijat.2014.p0864.

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The aim of this paper is to design, fabricate and control a novel Linear Magnetic Actuator (LMA) for applications such as active magnetic bearing systems to deal with vibration problems in rotating machines. This LMA actuator contains a moving body named ‘mover’ and three driving parts to drive the mover. Firstly, experiments have been conducted on the LMA to derive its mathematical model in order to investigate the generated electro-magnetic force as well as further research. The modeling result in a comparison with the actual system performance show that the electro-magnetic force varied symmetrically with the mover motion defined by the applied current. Secondly, an advanced trajectory controller named online tuning fuzzy PID controller has been designed for the LMA to improve the working performance. Finally, real-time experiments have been carried out to evaluate the tracking performance of the designed LMA control system. The results prove that the LMA driven by the proposed controller could track the desired trajectories with high accuracy.

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16

Kouroudis, I., D. Weber, M. Yoshizawa, B. Lüthi, L. Puech, P. Haen, J. Flouquet et al. "Novel magnetoacoustic effects in heavy-Fermion systems in high magnetic fields". Physical Review Letters 58, n.º 8 (23 de febrero de 1987): 820–23. http://dx.doi.org/10.1103/physrevlett.58.820.

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17

Willett, Roger D. "Novel One: Dimensional Magnetic Systems Based on Copper (II) Halide Salts". Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 274, n.º 1 (noviembre de 1995): 71–78. http://dx.doi.org/10.1080/10587259508031867.

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18

Entel, P. y M. Schröter. "A novel theoretical description of volume instabilities in itinerant magnetic systems". Physica B: Condensed Matter 161, n.º 1-3 (enero de 1990): 160–64. http://dx.doi.org/10.1016/0921-4526(89)90124-5.

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19

Pattanayak, Ranjit, Sourav Kuila, Krutika L. Routray, Subhajit Raut y Simanchalo Panigrahi. "Magnetic and Magnetoimpedance Study of BaFe12O19–Na0.5Bi0.5TiO3 Novel Magnetoelectric Composite Systems". IEEE Transactions on Magnetics 54, n.º 5 (mayo de 2018): 1–6. http://dx.doi.org/10.1109/tmag.2018.2795013.

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20

Ilić, T. V. "Novel applications and paradigms – transcranial magnetic stimulation". Clinical Neurophysiology 118, n.º 4 (abril de 2007): e118. http://dx.doi.org/10.1016/j.clinph.2006.11.279.

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21

Perez de Lara, David. "Hybrid Superconducting/Magnetic Multifunctional Devices in Two-Dimensional Systems". Physchem 2, n.º 4 (25 de noviembre de 2022): 347–56. http://dx.doi.org/10.3390/physchem2040025.

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The emergence of unexpected properties in two-dimensional materials, interfaces, and nanostructured materials opens an exciting framework for exploring new devices and applications. Recent advances in materials design and the nano structurization of novel, low-dimensional materials, surfaces, and interfaces offer a novel playground to design efficient multifunctional materials-based devices. Low-dimensional materials exhibit peculiarities in their electronic, magnetic, and optical properties, changing with respect to the bulk when they are layered down to a single layer, in addition to their high tunability. Their crystal structure and chemical bonds lead to inherent unique mechanical properties. The fabrication of van der Waals heterostructures by stacking materials with different properties, the better control of interfaces, and the tunability of the physical properties by mechanical strain, and chemical and electronic doping allow for the exploration of multifunctional devices with superconducting, magnetic, and optical properties and unprecedented degrees of freedom in terms of fabrication and tunability.

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22

Yeh, Po-Chen, Hao Duan y Tien-Kan Chung. "A Novel Three-Axial Magnetic-Piezoelectric MEMS AC Magnetic Field Sensor". Micromachines 10, n.º 10 (20 de octubre de 2019): 710. http://dx.doi.org/10.3390/mi10100710.

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We report a novel three-axial magnetic-piezoelectric microelectromechanical systems (MEMS) magnetic field sensor. The sensor mainly consists of two sensing elements. Each of the sensing elements consists of a magnetic Ni thick film, a Pt/Ti top electrode, a piezoelectric lead zirconate titanate (PZT) thin film, a Pt/Ti bottom electrode, a SiO2 insulation layer, and a moveable Si MEMS diaphragm. When the sensor is subjected to an AC magnetic field oscillating at 7.5 kHz, a magnetic force interaction between the magnetic field and Ni thick film is produced. Subsequently, the force deforms and deflects the diaphragms as well as the PZT thin film deposited on the diaphragms. The deformation and deflection produce corresponding voltage outputs due to the piezoelectric effect. By analyzing the voltage outputs through our criterion, we can obtain details of the unknown magnetic fields to which the sensor is subjected. This achieves sensing of three-axial magnetic fields. The experimental results show that the sensor is able to sense three-axial magnetic fields ranging from 1 to 20 Oe, with X-axial, Y-axial, and Z-axial sensitivities of 0.156 mVrms/Oe, 0.156 mVrms/Oe, and 0.035 mVrms/Oe, respectively, for sensing element A and 0.033 mVrms/Oe, 0.044 mVrms/Oe, and 0.130 mVrms/Oe, respectively, for sensing element B.

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23

Johnson, Ian M. y Zbigniew B. Doborzynski. "A novel ground electromagnetic system". GEOPHYSICS 51, n.º 2 (febrero de 1986): 396–409. http://dx.doi.org/10.1190/1.1442098.

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A novel, moving‐source, ground electromagnetic system has been developed. The system, named the “Genie,” has been in routine field use since 1982. The system is based on measurement of the ratio of magnetic field amplitude at two widely separated frequencies. The design is presented and compared with traditional horizontal loop electromagnetic (HLEM) systems. Field survey results show the system is effective in detecting conductors at shallow to intermediate depths in resistive environments. The system is shown to be roughly equivalent in many aspects to conventional HLEM systems with important advantages in areas of moderate to rough terrain.

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24

Tanaka, Hidekazu. "Quantum phases and quantum excitations in spin systems". Impact 2020, n.º 5 (9 de noviembre de 2020): 22–24. http://dx.doi.org/10.21820/23987073.2020.5.22.

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Professor Hidekazu Tanaka is based at the Department of Physics at the Tokyo Institute of Technology, Japan, where he is collaborating with a team of researchers to investigate magnetic quantum phenomena focusing on quantum phase transitions. Tanaka and his team have set about creating something they call a 'quantum magnetic excitation', which is essentially an elementary excitation that can be used on a quantum scale to explain how the quantum effect and multiple spins interact with one another. Their ultimate aim is to discover novel magnetic phenomena that occur at these scales and elucidate the mechanisms involved.

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25

Socoliuc, Vlad, Davide Peddis, Viktor I. Petrenko, Mikhail V. Avdeev, Daniela Susan-Resiga, Tamas Szabó, Rodica Turcu, Etelka Tombácz y Ladislau Vékás. "Magnetic Nanoparticle Systems for Nanomedicine—A Materials Science Perspective". Magnetochemistry 6, n.º 1 (2 de enero de 2020): 2. http://dx.doi.org/10.3390/magnetochemistry6010002.

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Iron oxide nanoparticles are the basic components of the most promising magneto-responsive systems for nanomedicine, ranging from drug delivery and imaging to hyperthermia cancer treatment, as well as to rapid point-of-care diagnostic systems with magnetic nanoparticles. Advanced synthesis procedures of single- and multi-core iron-oxide nanoparticles with high magnetic moment and well-defined size and shape, being designed to simultaneously fulfill multiple biomedical functionalities, have been thoroughly evaluated. The review summarizes recent results in manufacturing novel magnetic nanoparticle systems, as well as the use of proper characterization methods that are relevant to the magneto-responsive nature, size range, surface chemistry, structuring behavior, and exploitation conditions of magnetic nanosystems. These refer to particle size, size distribution and aggregation characteristics, zeta potential/surface charge, surface coating, functionalization and catalytic activity, morphology (shape, surface area, surface topology, crystallinity), solubility and stability (e.g., solubility in biological fluids, stability on storage), as well as to DC and AC magnetic properties, particle agglomerates formation, and flow behavior under applied magnetic field (magnetorheology).

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26

Yao, Tian, Shun Yao, Dan Tang, Long Jing, Daocai Wang y Hang Song. "Synthesis, magnetism, aqueous-two phase formation and physical properties of novel guanidinium-based magnetic ionic liquids". RSC Advances 6, n.º 58 (2016): 52898–904. http://dx.doi.org/10.1039/c6ra09879g.

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27

ATRE, M. V., A. P. BALACHANDRAN y T. R. GOVINDARAJAN. "MASSLESS SPINNING PARTICLES IN ALL DIMENSIONS AND NOVEL MAGNETIC MONOPOLES". International Journal of Modern Physics A 02, n.º 02 (abril de 1987): 453–83. http://dx.doi.org/10.1142/s0217751x87000181.

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There is a well-known description of a massless particle with spin in four dimensions in terms of position and momentum operators. The charge-monopole system can be obtained therefrom by a simple canonical transformation and a suitable choice of the Hamiltonian. In this paper, we generalize this description of a massless spinning particle to higher dimensions and then use the aforementioned transformation to define novel charge-monopole systems which are non-Abelian generalizations of the Abelian system of Dirac. The Lagrangian description of all these systems and their canonical quantization are also discussed. The analysis reveals the existence of symplectic structures which are likely to be original in the context of particle physics and which incidentally are capable of generalization to string theories. It further gives rise to new monopole fields which may be of use in the context of dimensional compactification.

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28

Harley, Simon, Nicola Rigonat y Ian Butler. "Magnetic Materials: Novel Monitors of Long-Term Evolution of Engineered Barrier Systems". Geosciences 6, n.º 4 (7 de diciembre de 2016): 54. http://dx.doi.org/10.3390/geosciences6040054.

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29

Qi, Luwei, Jianping Cai, Antai Han, Jun Wan, Congli Mei y Yunxia Luo. "A Novel Nonlinear Control Technique With Its Application to Magnetic Levitated Systems". IEEE Access 6 (2018): 78659–65. http://dx.doi.org/10.1109/access.2018.2885135.

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30

Grochala, Wojciech, Tomasz Jaron, Wojciech Wegner y Dawid Pancerz. "Novel lanthanide borohydrides: magnetism of all flavours". Acta Crystallographica Section A Foundations and Advances 70, a1 (5 de agosto de 2014): C275. http://dx.doi.org/10.1107/s2053273314097241.

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The rare-earth metals have high magnetic moments and a diverse range of magnetic structures. However, due to the inner-transition nature of lanthanide elements, the valence f orbitals of their trivalent cations usually do not mix substantially with the ligands' orbitals in the chemical compounds. The majority of lanthanide compounds is thus characterized by a rather ionic metal–ligand bonding and is hosting only weak crystal field effects. Several exceptions known encompass the valence fluctuation systems consisting of Sm, Ey, Tm or Yb combined with less electronegative nonmetal ligands (Si, S, Se, B etc.) or metals (Murani 2003 and references therein). This important class of lanthanide compounds for which crystal field effects are strong includes the classical systems: Yb3Si5 (Iandelli et al., 1979), YbB12 (Altshuler et al., 1998), and Yb3H8 (Drulis et al., 1999) . Even elemental Yb and Eu metals show valence transition at elevated pressure from di- to trivalent (Takemura & Syassen, 1985). These valence fluctuations are typically accompanied by electric resistivity changes: Ln(2+) → Ln(3+) + e–. Lanthanide borohydrides, Ln(BH4)3, constitute a rather poorly explored and novel group of compounds (Olsen et al., 2014). They are conveniently prepared via mechanochemical synthesis approach (high-energy milling). Quasi-ternary alkali metal-lanthanide borohydrides, MLn(BH4)4, are also available using this synthetic procedure (Wegner et al., 2013 [1] & Wegner et al., 2014 [2]). Here we explore for the first time the magnetic properties of Ln(BH4)3 and MLn(BH4)4 compounds, with particular emphasis on the thermally unstable systems (Ln= Sm, Yb and Eu) as contrasted with the reference case of much more thermally stable derivatives of ordinary lanthanides (Ln = Ho). We show that remarkably strong mixing of Ln(4f) and H(1s) states which causes thermal instability: Ln(3+) + BH4–→ Ln(2+) + BH4· leads in some cases to strong magnetic superexchange interactions between Ln(3+) centers [3].

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31

Li, Xin, Danlin Zeng, Ping Ke, Guanghui Wang y Dengke Zhang. "Synthesis and characterization of magnetic chitosan microspheres for drug delivery". RSC Advances 10, n.º 12 (2020): 7163–69. http://dx.doi.org/10.1039/c9ra10792d.

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A novel magnetic microsphere was prepared by the simple microemulsion polymerization for protein drug delivery systems. This magnetic microsphere exhibited good magnetism and superior drug loading capacity and evident sustained-release performance.

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32

Fourikis, N. "Novel radiometric phased array systems". Microwave and Optical Technology Letters 18, n.º 2 (5 de junio de 1998): 100–104. http://dx.doi.org/10.1002/(sici)1098-2760(19980605)18:2<100::aid-mop5>3.0.co;2-e.

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33

Xu, Xiao Zhuo, Xiao Feng Qin y Xu Dong Wang. "Characteristics Analysis of a Novel Detent-Force-Based Magnetic Suspension System". Advanced Materials Research 383-390 (noviembre de 2011): 2644–48. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.2644.

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A novel Detent-force-based Magnetic Suspension System (DMSS) is presented. The topological structure and operating principle of DMSS are analyzed. The characteristics of the axial, radial force and magnetic field and torsion moment are studied with FEA method respectively. Simulation results show that the DMSS can generate larger levitation force than common levitation systems, and its levitation mode is a passive suspension in the axial direction and torsion without external control.

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34

Marten, Gernot U., Thorsten Gelbrich y Annette M. Schmidt. "Hybrid biofunctional nanostructures as stimuli-responsive catalytic systems". Beilstein Journal of Organic Chemistry 6 (16 de septiembre de 2010): 922–31. http://dx.doi.org/10.3762/bjoc.6.98.

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A novel active biocatalytic reaction system is proposed by covalently immobilizing porcine pancreas trypsin within the thermoresponsive polymer shell of superparamagnetic Fe3O4 nanoparticles. Active ester-functional nanocarriers suitable for the immobilization of amino functional targets are obtained in a single polymerization step by grafting-from copolymerization of an active ester monomer from superparamagnetic cores. The comonomer, oligo(ethylene glycol) methyl ether methacrylate, has excellent water solubility at room temperature, biocompatibility, and a tunable lower critical solution temperature (LCST) in water. The phase separation can alternatively be initiated by magnetic heating caused by magnetic losses in ac magnetic fields. The immobilization of porcine pancreas trypsin to the core–shell nanoparticles results in highly active, nanoparticulate biocatalysts that can easily be separated magnetically. The enzymatic activity of the obtained biocatalyst system can be influenced by outer stimuli, such as temperature and external magnetic fields, by utilizing the LCST of the copolymer shell.

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35

Wu, Zhi Zheng y Mei Liu. "The Perspectives of Magnetic Fluid Deformable Mirrors for Adaptive Optics Systems". Advanced Materials Research 485 (febrero de 2012): 293–96. http://dx.doi.org/10.4028/www.scientific.net/amr.485.293.

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Recently, magnetic fluid deformable mirrors (MFDMs) were proposed as a novel type of wavefront correctors for adaptice optics (AO) systems, which offer cost and performance advantages over existing wavefront correctors. These mirrors are developed by coating the free surface of a magnetic fluid with a thin reflective film of nano-particles. The reflective surface of the mirrors can be deformed using a locally applied magnetic field and thus serves as a wavefront corrector. In this paper, the working principle of MFDMs is first presented, then the perspectives of MFDMs that will have to be addressed before they can be finally used practically in AO applications are discussed.

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36

Mrak, Branimir, Jeroen Willems, Jonathan Baake y Chris Ganseman. "Novel Adaptive Magnetic Springs for Reliable Industrial Variable Stiffness Actuation". Actuators 12, n.º 5 (30 de abril de 2023): 191. http://dx.doi.org/10.3390/act12050191.

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Parallel elastic actuation is a highly promising concept for assisting preplanned trajectories such as repetitive tasks in industrial machines and robots. Nevertheless, due to the persisting challenges on spring lifetime, its full potential has yet to be leveraged in the industry. We propose a novel adaptive magnetic spring as a fatigue-free spring mechanism to enable variable stiffness actuators in long lifetime applications. The spring is designed to flexibly deal with variations in operating conditions, i.e., mass customization. We propose a co-design methodology which simultaneously optimizes the sizing of the magnetic spring (for the given machine and its operating conditions), together with the controls and ideal dynamic response of the system. This mechanism and the methodology are applied to a design problem of a weaving machine drivetrain, where the benefits of the adaptive magnetic spring are highlighted with respect to a fixed stiffness magnetic spring, and the current industrial benchmark without springs. Experimentally validated findings show a consistent and considerable improvement with respect to energy consumption and peak torque reduction of up to 47% and 64%, respectively, when comparing to the current industrial benchmark.

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37

Ahn, Dahoon, Ji-Won Jin, Hyeeun Yun y Jaeheon Jeong. "Development of a Novel Dual Servo Magnetic Levitation Stage". Actuators 11, n.º 6 (30 de mayo de 2022): 147. http://dx.doi.org/10.3390/act11060147.

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The main objective of this paper is to propose, design, and control a novel dual servo magnetic levitation stage which is precise and vacuum compatible. The dual servo mechanism, comprising a coarse stage and a fine stage, was applied to a magnetic levitation stage system for the first time. The dual servo stage achieves high precision and a long stroke at the same time. The fine stage, which comprises voice coil motors, achieves high-precision motion by overcoming the limit of the coarse stage, the form of which is a planar motor. The planar motor was mathematically modeled and analyzed with respect to the main design parameters, after which the fine stage was optimally designed to be driven by high force. Both stages including a common heat exchanger were manufactured, and the heat exchanger cools down the heat given off from the planar motor and voice coil motors. The position measuring system consisted of laser interferometers and capacitive sensors, and the integrated dual servo stage was controlled with a master–slave control scheme. The experimental results showed a precision of 10 nm, thus confirming the suitability of the developed magnetic levitation stage for a high-precision fabrication process such as wafer lithography.

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38

Scheinfein, M. R. "Characterization of magnetic microstructure at high spatial resolution". Proceedings, annual meeting, Electron Microscopy Society of America 51 (1 de agosto de 1993): 4–5. http://dx.doi.org/10.1017/s0424820100145868.

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Advances in metal epitaxial growth techniques have produced renewed interest in magnetic materials through the unique properties of novel atomically engineered structures. Ultrathin layered and nanocrystalline, textured composites possess unique magnetic properties which are intimately connected to the physical microstructure on both the atomic and nanometer length scales. The length scales present in magnetic interactions span several orders of magnitude from the atomic length scales of the exchange interaction, to the mesoscopic length scales important in anti-ferromagnetic RKKY coupling between thin ferromagnetic films and small particles, to the macroscopic length scales determined by the long range magnetostatic interactions which are responsible for the formation of magnetic domains.Special characterization and computation techniques are required to analyze the micromagnetic and microstructural properties of these novel, low dimensional systems. In order to correlate the structure with the magnetic properties of any system, in-situ growth, structural, chemical and magnetic characterization is desirable.Most methods used for the observation of micromagnetic structure rely on a contrast mechanism derived from the magnetic fields present in ferromagnetic systems. We have implemented the conventional Fresnel, and less conventional Differential Phase Contrast modes of imaging magnetic microstructure in an HB5 STEM.

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39

Shiao, Yao Jung y Yao Kuan Huang. "Design of a Novel Damping-Controllable Damper for Suspension Systems". Advanced Materials Research 338 (septiembre de 2011): 622–25. http://dx.doi.org/10.4028/www.scientific.net/amr.338.622.

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Conventional oil dampers are non-controllable passive dampers because the viscosity of the fluid used is not wide-range variable. By using magneto-rheological fluid (MRF), MRF damper has excellent performance for variable-damping applications. Due to the single-coil design in the general MRF damper, the obtained damping from MR effect is not quite large. This research provides a high-damping MRF damper by adopting multi-pole coil and special polarization configuration. The simulated results show that the new MRF damper has good performance in the magnetic field and damping. Compared with a similar-size general single-coil MRF damper, this new MRF damper can get 47% higher performance under the same operating conditions.

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40

Panda, Pritish Kumar, Shivani Saraf, Ankita Tiwari, Amit Verma, Sarjana Raikwar, Ankit Jain y Sanjay K. Jain. "Novel Strategies for Targeting Prostate Cancer". Current Drug Delivery 16, n.º 8 (9 de octubre de 2019): 712–27. http://dx.doi.org/10.2174/1567201816666190821143805.

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: Prostate cancer (PCa) is a worldwide issue, with a rapid increase in its occurrence and mortality. Over the years, various strategies have been implemented to overcome the hurdles that exist in the treatment of PCa. Consistently, there is a change in opinion about the methodologies in clinical trial that have engrossed towards the treatment of PCa. Currently, there is a need to resolve these newly recognized challenges by developing newer rational targeting systems. The ongoing clinical protocol for the therapy using different targeting systems is undertaken followed by local targeting to cancer site. A number of new drug targeting systems like liposomes, nanoemulsions, magnetic nanoparticles (MNPs), solid lipid nanoparticles, drug-peptide conjugate systems, drug-antibody conjugate systems, epigenetic and gene therapy approaches, and therapeutic aptamers are being developed to suit this protocol. Recent advancements in the treatment of PCa with various nanocarriers have been reported with respect to newly identified biological barriers and intended to solve the contexts. This review encompasses the input of nanotechnology in particular targeting of PCa which might escape the lifethreatening side effects and potentially contribute to bring fruitful clinical outcomes.

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41

Loucaides, Neophytos, Antonio Ramos y George E. Georghiou. "Novel systems for configurable AC electroosmotic pumping". Microfluidics and Nanofluidics 3, n.º 6 (5 de abril de 2007): 709–14. http://dx.doi.org/10.1007/s10404-007-0168-1.

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42

KAN, ERJUN, ZHENYU LI y JINLONG YANG. "MAGNETISM IN GRAPHENE SYSTEMS". Nano 03, n.º 06 (diciembre de 2008): 433–42. http://dx.doi.org/10.1142/s1793292008001350.

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Graphene has attracted great interest in materials science, owing to its novel electronic structures. Recently, magnetism discovered in graphene-based systems has opened up the possibility of their spintronics application. This paper provides a comprehensive review of the magnetic behaviors and electronic structures of graphene systems, including two-dimensional graphene, one-dimensional graphene nanoribbons, and zero-dimensional graphene nanoclusters. Theoretical research suggests that such metal-free magnetism mainly comes from the localized states or edges states. By applying an external electric field, or by chemical modification, we can turn the zigzag nanoribbon systems into half metal, thus obtaining a perfect spin filter.

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43

Lavorato, Gabriel C., Raja Das, Javier Alonso Masa, Manh-Huong Phan y Hariharan Srikanth. "Hybrid magnetic nanoparticles as efficient nanoheaters in biomedical applications". Nanoscale Advances 3, n.º 4 (2021): 867–88. http://dx.doi.org/10.1039/d0na00828a.

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In this minireview we discuss and provide a perspective on the novel systems, the synthesis routes and the interface-mediated properties that determine the heating efficiency of hybrid magnetic nanoparticles.

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44

Kim, C., A. B. Palazzolo, A. Kascak y G. Brown. "Eddy Current Effects on the Design of Rotor-Magnetic Bearing Systems". Journal of Mechanical Design 117, B (1 de junio de 1995): 162–70. http://dx.doi.org/10.1115/1.2836450.

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The recent growth of magnetic bearing applications in the chemical, utility and aerospace industries requires more accurate design tools to insure reliable and effective operation as components of the overall rotor bearing system. This paper provides a novel approach for simulating a flexible rotor suspended in magnetic bearings, accounting for eddy current effects. The manuscript discusses some magnetic bearing fundamentals, leading up to the new methods for modeling. Test results show very good correlation with theory and confirm the importance of considering eddy current effects. Surface conductivity and frequency dependent permeability effects on the B field in the magnet gaps are shown to be very significant on overall system stability. The results in the manuscript should be very useful to the design or test rotor dynamicist.

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45

Kim, C., A. B. Palazzolo, A. Kascak y G. Brown. "Eddy Current Effects on the Design of Rotor-Magnetic Bearing Systems". Journal of Vibration and Acoustics 117, B (1 de junio de 1995): 162–70. http://dx.doi.org/10.1115/1.2838658.

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The recent growth of magnetic bearing applications in the chemical, utility and aerospace industries requires more accurate design tools to insure reliable and effective operation as components of the overall rotor bearing system. This paper provides a novel approach for simulating a flexible rotor suspended in magnetic bearings, accounting for eddy current effects. The manuscript discusses some magnetic bearing fundamentals, leading up to the new methods for modeling. Test results show very good correlation with theory and confirm the importance of considering eddy current effects. Surface conductivity and frequency dependent permeability effects on the B field in the magnet gaps are shown to be very significant on overall system stability. The results in the manuscript should be very useful to the design or test rotor dynamicist.

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46

Roesler, A. y Jian-Gang Zhu. "Novel magnetic characterization of the head-medium interface in metal particle tape systems". IEEE Transactions on Magnetics 37, n.º 5 (2001): 3850–59. http://dx.doi.org/10.1109/20.952757.

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47

Stamp, P. C. E. "Comment on ‘‘Novel magnetoacoustic effects in heavy-fermion systems in high magnetic fields’’". Physical Review Letters 59, n.º 4 (27 de julio de 1987): 517. http://dx.doi.org/10.1103/physrevlett.59.517.

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48

Rong, R., H. S. Kim, S. S. Park, N. W. Hwang, B. J. Kim y C. H. Ahn. "A Novel Magnetic Microdeflector for Electron Beam Control in Electron Beam Microcolumn Systems". IEEE Transactions on Magnetics 42, n.º 10 (octubre de 2006): 3237–39. http://dx.doi.org/10.1109/tmag.2006.878426.

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49

Sheng, Jianke, Qiaofu Chen, Jianxing Ke y Zhengchun Jia. "A novel principle of magnetic flux compensation and its application in power systems". International Journal of Electronics 90, n.º 11-12 (noviembre de 2003): 707–20. http://dx.doi.org/10.1080/0020721031000666384.

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50

Zhang, Xinwang, Nathan Schemm y Sina Balkır. "A novel power amplification scheme for nuclear magnetic resonance/nuclear quadrupole resonance systems". Review of Scientific Instruments 82, n.º 3 (marzo de 2011): 034707. http://dx.doi.org/10.1063/1.3571298.

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