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Range00:59

Range

13.9K
The range is one of the measures of variation. It can be defined as the difference between a dataset's highest and lowest values. For example, in the study of seven 16-ounce soda cans, the filled volume of soda was measured, thus producing the following amount (in ounces) of soda:
15.9; 16.1; 15.2; 14.8; 15.8; 15.9; 16.0; 15.5
Measurements of the amount of soda in a 16-ounce can vary since different subjects record these measurements or since the exact amount - 16 ounces of liquid, was not...
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Distance Corrections01:15

Distance Corrections

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To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
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Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
942
Power Factor Correction01:20

Power Factor Correction

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The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
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Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Related Experiment Video

Updated: Jan 23, 2026

Electrostatic Method to Remove Particulate Organic Matter from Soil
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Correcting long-range electrostatics in DFTB.

Rafał Podeszwa1, Wojciech Jankiewicz1, Magdalena Krzuś1

  • 1Institute of Chemistry, University of Silesia, Szkolna 9, 41-006 Katowice, Poland.

The Journal of Chemical Physics
|June 24, 2019
PubMed
Summary
This summary is machine-generated.

The current atom-based charge model in density functional tight binding (DFTB) inaccurately predicts charge distributions, affecting electrostatic interactions. A new DFTB-D-Q model improves accuracy by adding charges to account for missing quadrupole moments.

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Area of Science:

  • Computational Chemistry
  • Materials Science

Background:

  • The atom-based charge model in density functional tight binding (DFTB) is widely used.
  • Current DFTB versions struggle to accurately represent charge distribution in systems like homonuclear molecules, graphene, and nanotubes.

Purpose of the Study:

  • To address the limitations of the standard DFTB charge model.
  • To improve the accuracy of electrostatic interactions and energy predictions in DFTB, particularly for long- and medium-range interactions.

Main Methods:

  • Implementing additional bond (ghost) sites in homonuclear molecules to restore quadrupole moments.
  • Determining site charges using DFTB densities from the parameterization process, rather than Mulliken population analysis.
  • Proposing an extension to the DFTB plus dispersion (DFTB-D) model, termed DFTB-D-Q, for homonuclear molecules.

Main Results:

  • The standard DFTB charge model fails to reproduce correct charge distributions and electrostatic interactions due to missing quadrupole moments.
  • The proposed DFTB-D-Q model significantly enhances the accuracy of rotational barriers for interactions involving molecular hydrogen and nitrogen with benzene.
  • The new method successfully restores physically correct quadrupolar charge distributions.

Conclusions:

  • The DFTB charge model requires refinement to accurately capture electrostatic interactions, especially for systems with significant quadrupole moments.
  • The developed DFTB-D-Q model offers a more reliable approach for calculating interaction energies and barriers in relevant molecular systems.
  • Accurate charge distribution modeling is crucial for predicting system behavior in computational chemistry.