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In real life situations, very often a sudden change in dynamics results in missions being aborted which results in it having to be rescued before damage to other marine craft in the vicinity is caused. This problem has been suitably dealt with by an innovative adaptive autopilot design that is described herein. A model predictive control (MPC) adopts an online adaptive nature by utilizing weighted...
The Van Veen Loop, Large Loop Antenna (LLA), or Loop Antenna System (LAS), provides rapid determination of the net magnetic dipole moment of compact devices, especially in the frequency range of 9 kHz to 30 MHz, with minimal post processing of measured data. The symmetric shielded loop structure inherently rejects electric field excitation to a large extent if the action of the current transformer...
We demonstrated that increasing intracellular cAMP concentrations result in the inhibition of migration of PANC-1 and other pancreatic ductal adenocarcinoma (PDAC) cell types. The rise of cAMP was accompanied by rapid and reversible cessation of ruffling, by inhibition of focal adhesion turnover and by prominent loss of paxillin from focal adhesions. All these phenomena develop rapidly suggesting...
A comparison is made between the mixed lumped and distributed equivalent two-port networks for spherical modes, as derived by Thal, and the mixed lumped and distributed equivalent networks for certain classes of nonuniform transmission lines, as derived by Kobayashi. The extended Kuroda transform is used to derive a model for dipolar (radial index of 2) spherical mode propagation consisting of a nonuniform...
The q uasi-static near magnetic field of an inductive power transfer system would be expected to be intense. However, the quasi-static near electric field is also quite intense and merits investigation. As for any vector field, the near electric field can be decomposed into conservative and solenoidal components. The solenoidal component is the one that would be anticipated from Faraday's law. However,...
Inductive power transfer (IPT) is a subset of contactless power transfer appropriate for high-power applications such as the charging of electric vehicle batteries. Previous work has considered primarily the magnetostatic far field, that is, the region well away from the couplers in terms of coupler dimensions, but still close to the couplers in terms of the wavelength of the radiated field. The nature...
This paper presents a novel nonlinear autopilot design based on a nonlinear model predictive control (NMPC) approach that is compared against a linear quadratic Gaussian control scheme. The autopilot systems are used to control the nonlinear yaw dynamics of an uninhabited surface vehicle named Springer. The yaw dynamics of the vehicle being modelled using a multi-layer perceptron neural network. Simulation...
The Van Veen Loop or Large Loop Antenna (LLA) has been shown to be invaluable for the rapid characterization of the magnetic fields of certain compact devices such as ballasts for fluorescent lighting. Here, operation of the LLA in a shielded, semi-anechoic chamber is considered, including the calibration/verification of the loop using the folded-dipole verification source described in the standard...
Inductive wireless power transfer (IPT) necessarily involves intense time-varying magnetic fields. As predicted by Faraday's law, the time-varying magnetic flux due to the primary-side coupler of an IPT system induces electric field and hence current in all conductive materials which enter its field, intentionally or inadvertently. Thus, we examine the possibility of magnetostimulation or more specifically...
Inductive power transfer (IPT) systems typically employ a relatively pure sinusoidal primary current. The frequency of operation is chosen to not interfere with existing LF systems such as RFID transponders. Rectification combined with filtering on the secondary side of an IPT system necessarily introduces significant harmonic content into the secondary current as well as ringing, in some cases. Although...
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