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Related Concept Videos

Controller Configurations01:22

Controller Configurations

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Controller configurations are crucial in a car's cruise control system because they manage speed over time to maintain a consistent pace regardless of road conditions, thereby meeting design goals. In traditional control systems, fixed-configuration design involves predetermined controller placement. System performance modifications are known as compensation.
Control-system compensation involves various configurations, most commonly series or cascade compensation, in which the controller...
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Electron Configurations02:46

Electron Configurations

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Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
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Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Mesh Analysis with Current Sources01:10

Mesh Analysis with Current Sources

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Mesh analysis becomes simpler when analyzing circuits with current sources, whether independent or dependent. The presence of current sources reduces the number of equations required for analysis. Two cases illustrate this:
Current Source in One Mesh: The analysis process is straightforward when a current source is found in only one mesh within the circuit. Mesh currents are assigned as usual, with the mesh containing the current source excluded from the analysis. Kirchhoff's voltage law...
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Nodal Analysis with Voltage Sources01:11

Nodal Analysis with Voltage Sources

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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...
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Configurations of BJT01:16

Configurations of BJT

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Bipolar Junction Transistors (BJTs) are categorized into various types based on their configurations, each with distinct characteristics and applications. The configurations are primarily differentiated by which terminal—base, emitter, or collector—is common to both the input and output circuits.
The common base configuration is noted for its high voltage gain, positioning it as an ideal choice for single-stage amplifier circuits, such as microphone pre-amplifiers. A notable...
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Related Experiment Video

Updated: Feb 14, 2026

Dosimetry for Cell Irradiation using Orthovoltage 40-300 kV X-Ray Facilities
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Multi-source irradiation facility with improved space configuration for neutron activation analysis: Design

N A Kotb1, Ahmed H M Solieman2, T El-Zakla1

  • 1Radiation Protection Department, Hot Laboratories Centre, Atomic Energy Authority, Egypt.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|February 8, 2018
PubMed
Summary

A new neutron irradiation facility using americium-241 beryllium sources was designed for neutron activation analysis. It achieves high thermal neutron homogeneity and flux, ideal for precise sample analysis.

Keywords:
(241)Am-Be neutron sourceIrradiation facility designMCNP-5Neutron distributionNeutron spectrum

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Area of Science:

  • Nuclear Engineering
  • Materials Science

Background:

  • Neutron irradiation facilities are crucial for applications like neutron activation analysis (NAA).
  • Optimizing neutron flux and homogeneity is key for accurate and efficient analysis.

Purpose of the Study:

  • To design and optimize a neutron irradiation facility for neutron activation analysis.
  • To achieve high thermal neutron flux and homogeneity within the sample volume.

Main Methods:

  • Design and simulation of a neutron irradiation facility using MCNP-5 code.
  • Utilizing six 30 Ci 241Am-Be neutron sources embedded in paraffin wax as moderator and reflector.

Main Results:

  • Achieved a thermal neutron flux of 8.0 × 10^4 n/cm^2.s over a 5 cm diameter spherical sample.
  • Obtained high space symmetry and thermal neutron homogeneity within 98% of flux distribution.
  • Reported thermal-to-fast and thermal-to-epithermal ratios of 1.20 and 3.35, respectively.

Conclusions:

  • The designed neutron irradiation facility meets the requirements for effective neutron activation analysis.
  • The optimized design maximizes thermal neutron flux and homogeneity for sample irradiation.