Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 21 for “"Skin depth"”.
-
The radio frequency size effect in the anomalous skin depth region.
Massachusetts Institute of Technology. Dept. of Physics. Thesis. 1968. Ph.D.
-
Particle-In-cell simulations of nonlocal and nonlinear effects in inductively coupled plasmas
… by observing the resultant variations in the skin depth, surface impedance, and ponderomotive force (PMF). At low electron-neutral collision rates, these are shown to include the local collisionless regime, the anomalous skin effect regime, and the nonlinear regime.The local collisionless …
-
Turbulent Dynamics Under Two Ideal Invariants: Dynamic Phase Alignment in Plasmas and Nonionized Fluids
… in low-𝛽ₑ plasmas at scales below the electron skin depth and turbulence in non-ionized fluids governed by the Navier-Stokes equations. In both systems, the dynamics is dominated by the presence of energy and (generalized) helicity as two exact invariants. We show that, in the two systems, both …
-
Investigation of model micro-scale reconnecting plasma modes
… wavelengths of the order of the electron skin depth c/lwpe. This model mode, which can have finite wavelength parallel to the magnetic field, is found in the limit of a straight and uniform magnetic field in the presence of temperature gradients. The theory of the related …
-
A surface integral equation method for dielectrics at low frequencies
… is adopted. After these treatments, the skin depth of current in the conductive medium can be accurately captured down to very low frequency.
-
Two-dimensional numerical modeling of Radio-Frequency ion engine discharge
… power but is generally adequate. Optimum skin depth on the order of half of chamber radius is suggested by the simulation. The code also demonstrates excellent scaling ability as it successfully predicts the performance of a smaller thruster with errors less than 10%. Using the code a …
-
Elucidation of chemically-induced transdermal transport processes
… many techniques currently used to increase the skin permeability to a broader range of pharmaceutically relevant drugs. By taking advantage of the current developments in instrumentation technology, the mechanisms underlying the well-known chemical enhancer action of oleic acid have been …
-
Electrochemical Synthesis of Soft Magnetic Alloys and Laminates for High Frequency Field Application
… individual magnetic layers remains below their skin depth at a given frequency and serves as the resistive barriers mitigating eddy current flow between the magnetic layers. Compared to single-layer or bulk magnetic alloy counterparts, the synthesized laminates exhibit at least 50% higher …
-
A multi-frequency induction heating system for a thermally triggered gel polymer dynamic vibration absorber
… are much smaller than their associated skin depth. Extensive modeling of these targets is carried out and experimental results are presented. The ability to "selectively" heat these induction targets requires a power supply that can generate a sinewave with enough purity to not …
-
Numerical methods for electromagnetic wave propagation and scattering in complex media
… is difficult to calculate in early time when the skin depth is small. A new numerical method is developed to obtain an accurate and fast solution of the early time EMI response. The method is combined with the finite element method to provide the entire time domain response. The results are …
-
Can we probe the conductivity of the lithosphere and upper mantle using satellite ocean tidal magnetic signals?
… Electromagnetic induction studies utilize the skin depth concept which relates the period of a source electromagnetic field and the conductivity of the penetrated material with the maximum depth the field can penetrate. Traditional satellite-based induction studies use signals of magnetospheric …
-
Laboratory Astrophysics Studies of Magnetized Collisionless Shock Precursors and the ³He³He Proton Spectrum at the OMEGA Laser Facility
… between the ion Larmor radius and the ion skin depth for high plasma β, a sign of kinetic turbulence. Large scale particle-in-cell simulations of high β turbulence also have this feature showing that the experimental data are consistent with high β kinetic turbulence. For the microphysics …
-
Magnetic fields near microstructured surfaces : application to atom chips
… the atom-surface distance is comparable to the skin depth of metal. Since in the experiments, metallic layers are always etched to separate wires carrying different currents, the impact of the finite lateral wire size on the magnetic noise has been taken into account. The local spectrum of the …
-
A FIR Filter Embedded Millimeter-wave Front-end for High Frequency Selectivity
… reactive components loss caused by worsening skin depth effect and increasing dielectric loss through silicon substrate. This essentially degrades the reactive components quality factor (Q) and limits frequency selectivity of the silicon-based mm-Wave systems. This thesis tackles these two …
-
Experimental Studies of Magnetic Field Generation and Saturation Mechanisms in Laser-Driven Plasmas
… gradient scale length modestly exceeds the ion skin depth (𝐿𝑇 /𝑑𝑖 > 1). Second, Experimental observations of electron-scale structures in an expanding high-energy-density (HED) plasma generated with a modest intensity ∼2×10¹⁴W/cm², ∼1 ns laser are presented. The observed structures have …
-
Eddy current displacement sensor with LTCC technology
… frequency of a complete sensor coil and standard skin depth of eddy current in target blade were considered. Subsequently, the FEM method was used for further calculations. It was found via modal analysis that the position over the sharp end of a blade tip is the optimal mounting position for a …
-
Deep penetration magnetoquasistatic sensors
… are needed for deep probing of metals, where the depth of penetration is otherwise limited by the skin depth due to the shielding effect of induced eddy currents. The capability to perform such imaging without dependence on calibration standards has both substantial cost, ease of use, and …
-
Numerical methods for frequency dependent line parameters with applications to microstrip lines and pipe-type cables
… to calculate line parameters because of skin and proximity effects. A common strategy is to apply the subdivision principle — to subdivide the line conductors into smaller parts so that the traditional formulae may be used. Based on this strategy, new numerical methods have been developed …
-
Design and Integration Techniques for High-Frequency PCB-Based Magnetics in Resonant Converters
… layer is designed within 1 to 2 times the skin depth. On the other hand, the inductor's winding lacks interleaving and suffers from high MMF stress on layers. This makes the inductor prone to high eddy currents and eddy loss. Furthermore, this dissertation addresses the challenges …
-
Current Induced Magnetisation Dynamics in Ferromagnetic Nanowires
… electromagnetic fields with different skin depths (both non-magnetic and magnetic) that control the resonance mechanism and spin-wave modes in the magnetic nanowires. Available analytical models of the magnetisation dynamics and resonance in magnetic nanowires simplify the …
Page 1 of 2