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Nodal Analysis01:10

Nodal Analysis

2.1K
Nodal analysis is a fundamental method in electrical engineering used to simplify the process of circuit analysis. This method revolves around the concept of using node voltages as the primary variables for circuit analysis. The objective is to determine the voltage at each node in a circuit, which can then be used to find other quantities of interest, such as currents through specific components.
Consider, for instance, a simple circuit composed of three nodes and three resistors, as shown in...
2.1K
Nodal Analysis with Voltage Sources01:11

Nodal Analysis with Voltage Sources

2.2K
Nodal analysis is a remarkably effective method used in electrical engineering to simplify the analysis of complex circuits, including those with dependent or independent voltage sources. Its strength lies in its systematic approach to breaking down circuits into manageable components, making it easier for engineers to understand and solve.
Consider a circuit that contains four resistors and two voltage sources, as shown in Figure 1. One of these voltage sources is connected between a...
2.2K
Node Analysis for AC Circuits01:14

Node Analysis for AC Circuits

774
Consider an angioplasty system featuring a catheter equipped with a turbine, a critical tool for removing plaque deposits from coronary arteries. This intricate medical device operates using a circuit model reminiscent of a dual-node RLC circuit powered by a current-controlled voltage source.
To unravel the complexities of this system, nodal analysis is employed, a powerful technique founded on Kirchhoff's current law (KCL), which remains valid for phasors. AC circuits can effectively be...
774
Trapezoidal Rule01:26

Trapezoidal Rule

231
Estimating the distance traveled by a vehicle using its recorded velocity over time is a common problem in physics and engineering. When velocity data is available at discrete time intervals, rather than as a continuous function, numerical integration methods such as the trapezoidal rule are often employed to approximate the total displacement.The trapezoidal rule works by dividing the total time interval into several equal segments. Within each segment, the recorded velocities at the endpoints...
231
Mesh Analysis01:20

Mesh Analysis

1.6K
Mesh analysis is a valuable method for simplifying circuit analysis using mesh currents as key circuit variables. Unlike nodal analysis, which focuses on determining unknown voltages, mesh analysis applies Kirchhoff's voltage law (KVL) to find unknown currents within a circuit. This method is particularly convenient in reducing the number of simultaneous equations that need to be solved.
A fundamental concept in mesh analysis is the definition of meshes and mesh currents. A mesh is a closed...
1.6K
Design Example: Traverse Angle Computations01:25

Design Example: Traverse Angle Computations

443
Traverse angle computations are a critical component of surveying, used to compute the internal angles within a closed traverse. A traverse consists of a series of connected lines forming a closed loop, often used for land boundary delineation or mapping. Calculating the internal angles ensures accuracy in the traverse geometry and is essential for checking survey data integrity.The process begins with known azimuths and bearings of the traverse sides. Internal angles at each vertex are...
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Updated: Apr 22, 2026

Finite Element Modelling of a Cellular Electric Microenvironment
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Ray tracing in a finite-element domain using nodal basis functions.

Karl N Schrader, Samuel R Subia, John W Myre

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    This study introduces a finite-element method for tracing rays through complex optical media. The new approach accurately models refractive index gradients and surface deformations for precise ray path calculations.

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    Area of Science:

    • Optics and Photonics
    • Computational Physics
    • Materials Science

    Background:

    • Ray tracing is crucial for optical design and analysis.
    • Traditional methods struggle with complex refractive index gradients and surface irregularities.
    • Finite-element methods offer a powerful framework for discretizing complex geometries.

    Purpose of the Study:

    • To develop a novel finite-element method for accurate ray tracing in heterogeneous optical media.
    • To precisely model ray trajectories influenced by severe refractive index gradients.
    • To accurately compute refraction at interfaces with interpolated surface deformations.

    Main Methods:

    • Ray-trajectory equations were formulated in a local element coordinate frame.
    • Full finite-element interpolation determined instantaneous index gradients for ray path integrals.
    • Finite-element methodology interpolated surface deformations and normal vectors for refraction calculations.
    • The method was applied to a finite-element model of an optic with a severe refractive index gradient.

    Main Results:

    • The finite-element ray tracing method successfully handled severe refractive index gradients.
    • Calculated ray paths showed good agreement with the closed-form gradient ray-path integral approach.
    • The method accurately computed refraction angles at surfaces with interpolated deformations.

    Conclusions:

    • The presented finite-element method provides an accurate and robust approach for ray tracing in complex optical systems.
    • This methodology is particularly effective for media with significant refractive index variations and irregular surfaces.
    • The findings support the use of finite-element analysis for advanced optical modeling and simulation.