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Related Concept Videos

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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Variation: Normal Distribution, Range, and Standard Deviation02:32

Variation: Normal Distribution, Range, and Standard Deviation

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In the field of psychology, there are several ways to organize measurements of a trait, feature, or characteristic (i.e., variables). Qualitative data, such as ethnicity, can be tabulated into a frequency count to provide information about the proportion, as well as the variety of groups in a sample or population. On the other hand, researchers can perform a wider set of calculations on quantitative data. The mean, mode, and median, for instance, are central tendency measures to identify a...
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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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Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
783
Range Rule of Thumb to Interpret Standard Deviation01:13

Range Rule of Thumb to Interpret Standard Deviation

13.4K
The range rule of thumb in statistics helps us calculate a dataset's minimum and maximum values with known standard deviation. This rule is based on the concept that 95% of all values in a dataset lie within two standard deviations from the mean.
For instance, the range rule of thumb can be used to find the tallest and the shortest student in a class, given the mean student height and standard deviation. If the mean student height is 1.6 m and the standard deviation, s is 0.05 m, the height...
13.4K
Circular Shaft - Stresses in Linear Range01:13

Circular Shaft - Stresses in Linear Range

715
Consider a scenario where a circular shaft is subject to torque that remains within the boundaries of Hooke's Law, avoiding any permanent deformation. So, the formula for shearing strain is revisited. This formula is multiplied by the modulus of rigidity, and then Hooke's Law for the shearing stress and strain is applied. As a result, the equation for shearing stress in a shaft can be derived.
715

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Multi-reference broadband laser ranging to increase the measuring range.

Jing Wang1, Shouxian Liu1, Jianzhong Li1

  • 1Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China.

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|April 1, 2019
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Broadband laser ranging (BLR) has range limitations. A new multi-reference BLR method significantly expands the measuring range without sacrificing resolution, enhancing its capability for dynamic experiments.

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Area of Science:

  • Physics
  • Optical Engineering
  • Metrology

Background:

  • Broadband laser ranging (BLR) is crucial for absolute distance measurements in dynamic experiments.
  • Current BLR methods face inherent limitations in extending measuring range while maintaining distance or time resolution.

Purpose of the Study:

  • To analyze the performance limitations of conventional Broadband Laser Ranging.
  • To propose and validate a novel multi-reference BLR technique for extended measuring ranges.

Main Methods:

  • Performance analysis of standard Broadband Laser Ranging.
  • Development and experimental demonstration of multi-reference Broadband Laser Ranging.

Main Results:

  • Identified performance limits preventing range increase without resolution compromise in BLR.
  • Successfully demonstrated the multi-reference BLR technique with a 100 mm displacement measurement.
  • Achieved a significant increase in measuring range using the proposed method.

Conclusions:

  • The multi-reference BLR method overcomes the range-resolution trade-off inherent in traditional BLR.
  • This advancement substantially improves the capability of Broadband Laser Ranging for dynamic measurements.