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Related Concept Videos

Range00:59

Range

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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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¹H NMR: Long-Range Coupling01:27

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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.
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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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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...
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Range Rule of Thumb to Interpret Standard Deviation01:13

Range Rule of Thumb to Interpret Standard Deviation

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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...
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Circular Shaft - Stresses in Linear Range01:13

Circular Shaft - Stresses in Linear Range

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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.
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Pilot Sleep in Long-Range and Ultra-Long-Range Commercial Flights.

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    Pilots on long-haul flights get adequate sleep, but circadian rhythms shift during trips. Sleep duration recovers quickly after flights, suggesting minimal long-term impact on pilot rest.

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    Area of Science:

    • Aviation Physiology
    • Sleep Medicine
    • Chronobiology

    Background:

    • Understanding pilot sleep is crucial for long-range (LR) and ultra-long-range (ULR) flights.
    • Limited research exists on sleep loss and circadian desynchronization in commercial pilots.

    Purpose of the Study:

    • To assess pilot sleep timing, duration, and recovery on LR and ULR flights.
    • To investigate the impact of flight schedules on pilot circadian rhythms.

    Main Methods:

    • Actigraphy and logbooks were used to measure sleep/wake patterns over 8-9 days.
    • Pilots' sleep was monitored on two LR and two ULR nonstop California to Australasia routes.

    Main Results:

    • Pilots averaged 8.2 hours of sleep per 24-hour period.
    • Circadian timing, trip phase, and route significantly predicted sleep.
    • Layover sleep shifted towards local night, but full recovery occurred within 1-2 days post-trip.

    Conclusions:

    • Average sleep duration was within normal ranges for all routes.
    • Circadian rhythm misalignment occurred during flight segments and layovers.
    • Post-trip sleep recovery was generally rapid (1-2 days).