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Tero Raita - One of the best experts on this subject based on the ideXlab platform.
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spatial localization and ducting of emic waves van allen probes and ground based observations
Geophysical Research Letters, 2014Co-Authors: Ian R. Mann, Matthew Robertson, A Kale, David K. Milling, C. A. Kletzing, K R Murphy, S A Thaller, John R Wygant, Maria Usanova, Tero RaitaAbstract:On 11 October 2012, during the recovery phase of a moderate geomagnetic storm, an extended interval (> 18 h) of continuous electromagnetic ion cyclotron (EMIC) waves was observed by Canadian Array for Real-time Investigations of Magnetic Activity and Solar-Terrestrial Environment Program Induction Coil magnetometers in North America. At around 14:15 UT, both Van Allen Probes B and A (65° magnetic longitude apart) in conjunction with the ground array observed very narrow (ΔL ~ 0.1–0.4) left-hand polarized EMIC emission confined to regions of mass density gradients at the outer edge of the plasmasphere at L ~ 4. EMIC waves were seen with complex polarization patterns on the ground, in good agreement with model results from Woodroffe and Lysak (2012) and consistent with Earth's rotation sweeping magnetometer stations across multiple polarization reversals in the fields in the Earth-ionosphere duct. The narrow L-widths explain the relative rarity of space-based EMIC occurrence, ground-based measurements providing better estimates of global EMIC wave occurrence for input into radiation belt dynamical models.
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spatial localization and ducting of emic waves van allen probes and ground based observations
Geophysical Research Letters, 2014Co-Authors: Ian R. Mann, Matthew Robertson, A Kale, David K. Milling, C. A. Kletzing, K R Murphy, S A Thaller, John R Wygant, Maria Usanova, Tero RaitaAbstract:On 11 October 2012, during the recovery phase of a moderate geomagnetic storm, an extended interval (> 18 h) of continuous electromagnetic ion cyclotron (EMIC) waves was observed by Canadian Array for Real-time Investigations of Magnetic Activity and Solar-Terrestrial Environment Program Induction Coil magnetometers in North America. At around 14:15 UT, both Van Allen Probes B and A (65° magnetic longitude apart) in conjunction with the ground array observed very narrow (ΔL ~ 0.1–0.4) left-hand polarized EMIC emission confined to regions of mass density gradients at the outer edge of the plasmasphere at L ~ 4. EMIC waves were seen with complex polarization patterns on the ground, in good agreement with model results from Woodroffe and Lysak (2012) and consistent with Earth's rotation sweeping magnetometer stations across multiple polarization reversals in the fields in the Earth-ionosphere duct. The narrow L-widths explain the relative rarity of space-based EMIC occurrence, ground-based measurements providing better estimates of global EMIC wave occurrence for input into radiation belt dynamical models.
Robert Ivkov - One of the best experts on this subject based on the ideXlab platform.
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design and construction of a maxwell type Induction Coil for magnetic nanoparticle hyperthermia
International Journal of Hyperthermia, 2020Co-Authors: Anilchandra Attaluri, John Jackowski, Anirudh Sharma, Sri Kamal Kandala, Valentin Nemkov, Chris Yakey, Theodore L. Deweese, Ananda Kumar, Robert Goldstein, Robert IvkovAbstract:We describe a modified Helmholtz Induction Coil, or Maxwell Coil, that generates alternating magnetic fields (AMF) having field uniformity (≤10%) within a = 3000 cm3 volume of interest for magnetic...
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Design and construction of a Maxwell-type Induction Coil for magnetic nanoparticle hyperthermia
'Informa UK Limited', 2020Co-Authors: Anilchandra Attaluri, John Jackowski, Anirudh Sharma, Sri Kamal Kandala, Valentin Nemkov, Chris Yakey, Theodore L. Deweese, Ananda Kumar, Robert C. Goldstein, Robert IvkovAbstract:Purpose We describe a modified Helmholtz Induction Coil, or Maxwell Coil, that generates alternating magnetic fields (AMF) having field uniformity (≤10%) within a = 3000 cm3 volume of interest for magnetic hyperthermia research. Materials and methods Two-dimensional finite element analysis (2D-FEA) was used for electromagnetic design of the Induction Coil set and to develop specifications for the required matching network. The matching network and Induction Coil set were fabricated using best available practices and connected to a 120 kW industrial Induction heating power supply. System performance was evaluated by magnetic field mapping with a magnetic field probe, and tests were performed using gel phantoms. Results Tests verified that the system generated a target peak AMF amplitude along the Coil axis of ∼35 kA/m (peak) at a frequency of 150 ± 10 kHz while maintaining field uniformity to >90% of peak for a volume of ∼3000 cm3. Conclusions The Induction Coil apparatus comprising three independent loops, i.e., Maxwell-type improves upon the performance of simple solenoid and Helmholtz Coils by providing homogeneous flux density fields within a large volume while minimizing demands on power and stray fields. Experiments with gel phantoms and analytical calculations show that future translational research efforts should be devoted to developing strategies to reduce the impact of nonspecific tissue heating from eddy currents; and, that an inductor producing a homogeneous field has significant clinical potential for deep-tissue magnetic fluid hyperthermia
Ian R. Mann - One of the best experts on this subject based on the ideXlab platform.
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spatial localization and ducting of emic waves van allen probes and ground based observations
Geophysical Research Letters, 2014Co-Authors: Ian R. Mann, Matthew Robertson, A Kale, David K. Milling, C. A. Kletzing, K R Murphy, S A Thaller, John R Wygant, Maria Usanova, Tero RaitaAbstract:On 11 October 2012, during the recovery phase of a moderate geomagnetic storm, an extended interval (> 18 h) of continuous electromagnetic ion cyclotron (EMIC) waves was observed by Canadian Array for Real-time Investigations of Magnetic Activity and Solar-Terrestrial Environment Program Induction Coil magnetometers in North America. At around 14:15 UT, both Van Allen Probes B and A (65° magnetic longitude apart) in conjunction with the ground array observed very narrow (ΔL ~ 0.1–0.4) left-hand polarized EMIC emission confined to regions of mass density gradients at the outer edge of the plasmasphere at L ~ 4. EMIC waves were seen with complex polarization patterns on the ground, in good agreement with model results from Woodroffe and Lysak (2012) and consistent with Earth's rotation sweeping magnetometer stations across multiple polarization reversals in the fields in the Earth-ionosphere duct. The narrow L-widths explain the relative rarity of space-based EMIC occurrence, ground-based measurements providing better estimates of global EMIC wave occurrence for input into radiation belt dynamical models.
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spatial localization and ducting of emic waves van allen probes and ground based observations
Geophysical Research Letters, 2014Co-Authors: Ian R. Mann, Matthew Robertson, A Kale, David K. Milling, C. A. Kletzing, K R Murphy, S A Thaller, John R Wygant, Maria Usanova, Tero RaitaAbstract:On 11 October 2012, during the recovery phase of a moderate geomagnetic storm, an extended interval (> 18 h) of continuous electromagnetic ion cyclotron (EMIC) waves was observed by Canadian Array for Real-time Investigations of Magnetic Activity and Solar-Terrestrial Environment Program Induction Coil magnetometers in North America. At around 14:15 UT, both Van Allen Probes B and A (65° magnetic longitude apart) in conjunction with the ground array observed very narrow (ΔL ~ 0.1–0.4) left-hand polarized EMIC emission confined to regions of mass density gradients at the outer edge of the plasmasphere at L ~ 4. EMIC waves were seen with complex polarization patterns on the ground, in good agreement with model results from Woodroffe and Lysak (2012) and consistent with Earth's rotation sweeping magnetometer stations across multiple polarization reversals in the fields in the Earth-ionosphere duct. The narrow L-widths explain the relative rarity of space-based EMIC occurrence, ground-based measurements providing better estimates of global EMIC wave occurrence for input into radiation belt dynamical models.
Slawomir Tumanski - One of the best experts on this subject based on the ideXlab platform.
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Induction Coil sensors - A review
Measurement Science and Technology, 2007Co-Authors: Slawomir TumanskiAbstract:This review describes Induction Coil sensors, which are also known as\n search Coils, pickup Coils or magnetic loop sensors. The design\n methods for Coils with air and ferromagnetic cores are compared and\n summarized. The frequency properties of Coil sensors are analysed and\n various methods for output signal processing are presented. Special\n kinds of Induction sensors, such as Rogowski Coil, gradiometer\n sensors, vibrating Coil sensors, tangential field sensors and needle\n probes are described. The applications of Coil sensors as magnetic\n antennae are also presented.
Chihhau Chen - One of the best experts on this subject based on the ideXlab platform.
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key parameters and optimal design of a single layered Induction Coil for external rapid mold surface heating
International Communications in Heat and Mass Transfer, 2014Co-Authors: Shihchih Nian, Mingshyan Huang, Shengwei Tsai, Rongcheng Huang, Chihhau ChenAbstract:Abstract Setting high mold temperatures for injection-molding plastics facilitates favorable flow conditions for filling cavities with melted materials and provides an esthetically pleasing surface as well as a high replication rate of high-quality products; however, the cooling times are typically prolonged. Electromagnetic Induction heating incorporating surface heating instead of conventional volume heating for mold-heating processes is advantageous because it provides a rapid heating time and a reduced cooling time, is environmentally friendly, and saves energy; therefore, it has been adopted in various variotherm injection-molding systems. Although previous studies have discussed how Induction heating is influenced by major factors, such as the number of Coil turns, working frequency, and heating distance, few studies have investigated other crucial factors, such as the thickness of the heated target and the position of the Induction Coil. In this study, the effects of the thickness of a heated target, pitch of Coil turns, heating distance, position of the Induction Coil, working frequency, and waiting time on the heating rate and temperature uniformity of Induction heating on a mold surface by using a single-layered Coil were analyzed. In addition, the Taguchi method and principal component analysis were applied to determine the optimal combination of control factors for achieving a high heating rate and low temperature deviation. Both simulation and experimental results indicated that the thickness of a heated target plays a crucial role in affecting the heating rate; specifically, a thicker workpiece slows the heating process and generates rapid heat dissipation after Induction heating. Moreover, the position of the Induction Coil exerts the most notable effect on heating uniformity.