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Related Concept Videos

Sequence Networks of Rotating Machines01:24

Sequence Networks of Rotating Machines

A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
Reducing Line Loss01:18

Reducing Line Loss

In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
Vector Algebra: Graphical Method01:10

Vector Algebra: Graphical Method

Vectors can be multiplied by scalars, added to other vectors, or subtracted from other vectors. The vector sum of two (or more) vectors is called the resultant vector or, for short, the resultant.
We use the laws of geometry to construct resultant vectors, followed by trigonometry to find vector magnitudes and directions. For a geometric construction of the sum of two vectors in a plane, we follow the parallelogram rule. Suppose two vectors are at arbitrary positions. Translate either one of...

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Related Experiment Video

Updated: May 15, 2026

Modeling the Functional Network for Spatial Navigation in the Human Brain
05:55

Modeling the Functional Network for Spatial Navigation in the Human Brain

Published on: October 13, 2023

An ultrafast tool for minimum reticulate networks.

Zhi-Zhong Chen1, Lusheng Wang

  • 1Division of Information System Design, Tokyo Denki University, Ishizaka, Hatoyama, Hiki, Saitama, Japan. zzchen@mail.dendai.ac.jp

Journal of Computational Biology : a Journal of Computational Molecular Cell Biology
|January 9, 2013
PubMed
Summary
This summary is machine-generated.

Evolutionary hybridization creates multiple phylogenetic trees. This study introduces UltraNet, a tool to combine these trees into a reticulate network with minimal hybridization events, improving computational speed.

Related Experiment Videos

Last Updated: May 15, 2026

Modeling the Functional Network for Spatial Navigation in the Human Brain
05:55

Modeling the Functional Network for Spatial Navigation in the Human Brain

Published on: October 13, 2023

Area of Science:

  • Computational evolutionary biology
  • Phylogenetics
  • Bioinformatics

Background:

  • Hybridization events in evolution can result in incongruent phylogenetic trees when analyzing different genes from the same species set.
  • Reconciling these differing trees is crucial for understanding complex evolutionary histories.

Purpose of the Study:

  • To develop a software tool, UltraNet, for constructing minimum reticulate networks from multiple phylogenetic trees.
  • To address fundamental computational problems associated with combining phylogenetic trees.

Main Methods:

  • Development of the UltraNet software tool.
  • Algorithmic approaches for identifying and minimizing hybridization events in phylogenetic networks.

Main Results:

  • UltraNet effectively constructs reticulate networks from multiple phylogenetic trees.
  • Experimental results demonstrate significantly faster performance compared to existing tools for minimum reticulate network construction.

Conclusions:

  • UltraNet provides an efficient solution for inferring evolutionary histories involving hybridization.
  • The tool aids in resolving phylogenetic conflicts arising from reticulate evolution.