Optimization of sparse 4D seismic surveys using seismic full waveform inversion

Accurate characterization and reliable monitoring of geological reservoirs often requires extensive geophysical measurements, in particular time-lapse (4D) seismic surveys. The conventional approach to reveal the time-lapse changes is to perform comprehensive seismic surveys with high repeatability. This approach is often not economically viable...

Truncation effects in connected arrays: Analytical models to describe the edge-induced wave phenomena

This paper presents a Green's function based procedure to assess edge effects in finite wideband connected arrays. Truncation effects are more severe in broadband arrays, since the inter-element mutual coupling facilitates the propagation of edge-born waves that can become dominant over large portions of the arrays. As a consequence, the overall...

Full-waveform static corrections using blind channel identification

Near-surface wavefield perturbations can be very complex and completely mask the target reflections. Despite this complexity, conventional methods rely on parameterizations characterized by simple time and amplitude anomalies to compensate for these perturbations. Determining and compensating for time shifts is generally referred to as (residual...

Analysis of SINR for UMTS Rake receiver-smart antenna processing using two different modelling approaches

In 3G mobile communication systems, smart antenna processing is seen as a powerful tool to combat directional interference. In this paper we derive the statistics of the signal-to-interference+noise ratio (SINR) achieved by the combined Rake receiver-smart antenna processing for the case where the thermal noise is the only source of interference...

Current sharing between diode clamps of polar capacitor bank

The layout of a capacitor bank with clamping diodes is investigated based on an experimental 5.5-kJ energy storage unit for pulsed power applications. While the current sharing between parallel-connected capacitors is good, it is not the case with parallel-connected clamping diodes. Despite a very-low-inductance busbar and attention to...

A physical method to incorporate parasitic elements in a circuit simulator based on the partial inductance concept

In switching Power Electronics circuits inductive parasitics of wiring and components contribute substantially to the current and voltage waveforms. This article addresses the theoretical basis as well as the implementation and validation of the incorporation of these inductances in a computerised circuit simulation. The program presented in...