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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Dimensional Analysis03:40

Dimensional Analysis

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Dimensional analysis, also known as the factor label method, is a versatile approach for mathematical operations. The main principle behind this approach is: the units of quantities must be subjected to the same mathematical operations as their associated numbers. This method can be applied to computations ranging from simple unit conversions to more complex and multi-step calculations involving several different quantities and their units.
Conversion Factors and Dimensional Analysis
The unit...
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What is a Frequency Distribution00:51

What is a Frequency Distribution

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A frequency is the number of times a value of the data occurs. The sum of all the frequency values represents the total number of students included in the sample. It is commonly used to group data of quantitative types. Frequency distributions can be displayed in a table, histogram, line graph, dot plot, or pie chart, just to name a few. A histogram is a graphical representation of tabulated frequencies, shown as adjacent rectangles, erected over discrete intervals (bins), with an area equal to...
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Mean From a Frequency Distribution01:11

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Sometimes, data gathered from an experiment on a large sample or population are organized into concise tables. In such cases, the frequency of the quantitative data set is plotted in the form of a table. Or else, the data values are grouped into the quantity’s intervals, which form classes, and their respective frequencies are known. That is, the data values are distributed over different categories or classes. This is known as frequency distribution.
When such a data set is encountered,...
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Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
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Frequency Response of BJT01:24

Frequency Response of BJT

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The frequency response of a Bipolar Junction Transistor (BJT) in a common-emitter configuration is critical to its functionality, especially in applications involving amplification of alternating current (AC) signals. This response can be analyzed through low-frequency and high-frequency equivalent circuits, considering various internal parameters and external conditions.
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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Two-Dimensional Spectroscopy at Terahertz Frequencies.

Jian Lu1, Xian Li1, Yaqing Zhang1

  • 1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.

Topics in Current Chemistry (Cham)
|January 25, 2018
PubMed
Summary
This summary is machine-generated.

Terahertz (THz) multidimensional spectroscopy reveals dynamic correlations in systems like gas molecules and magnetic materials. This technique offers new insights into molecular dynamics and material properties at THz frequencies.

Keywords:
Gas-phase molecular rotationsLiquid-phase molecular dynamicsMagnetic resonancesTerahertz

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Multidimensional spectroscopy is a powerful tool for studying dynamic correlations in visible and infrared ranges.
  • Extending multidimensional spectroscopy to the terahertz (THz) regime has been challenging but offers access to unique material properties.

Purpose of the Study:

  • To review recent advancements in THz-frequency two-dimensional (2D) spectroscopy techniques.
  • To highlight experimental results and applications of 2D THz spectroscopy.

Main Methods:

  • Utilizing multiple correlated light-matter interactions.
  • Developing and applying THz-frequency two-dimensional (2D) spectroscopy techniques.
  • Employing hybrid 2D THz-Raman spectroscopy.

Main Results:

  • Demonstrated applications in gas molecule rotations, spin precessions in magnetic systems, and liquid molecular dynamics.
  • Successful implementation of 2D THz spectroscopy for studying THz-frequency degrees of freedom.
  • Showcased the potential of hybrid 2D THz-Raman spectroscopy.

Conclusions:

  • THz multidimensional spectroscopy is a promising methodology for investigating diverse chemical systems and processes.
  • The technique provides valuable insights into THz-frequency dynamics and couplings.
  • Further development is expected to expand its applications across various scientific fields.