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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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Glassware Calibration01:11

Glassware Calibration

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Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
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Instrument Calibration01:12

Instrument Calibration

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Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
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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.
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Calibration Curves: Correlation Coefficient01:10

Calibration Curves: Correlation Coefficient

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In a linear calibration curve, there is a value called the calibration coefficient, denoted by 'r,' which measures the strength and the direction of association between two variables. The correlation coefficient value ranges from −1 to +1. A value of +1 indicates a perfect positive linear correlation, −1 denotes a perfect negative correlation, and 0 implies no correlation between the two variables. A positive correlation value establishes that as one variable increases, the...
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Plotting and Calibrating the Root Locus01:19

Plotting and Calibrating the Root Locus

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Root loci often diverge as system poles shift from the real axis to the complex plane. Key points in this transition are the breakaway and break-in points, indicating where the root locus leaves and reenters the real axis. The branches of the root locus form an angle of 180/n degrees with the real axis, where n is the number of branches at a breakaway or break-in point.
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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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Note: A self-calibrating wide range electrometer for in-cloud measurements.

R Giles Harrison1, Graeme J Marlton1, Keri A Nicoll1

  • 1Department of Meteorology, University of Reading, Earley Gate, Reading RG6 6BB, United Kingdom.

The Review of Scientific Instruments
|January 1, 2018
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Summary
This summary is machine-generated.

Scientists developed a new hybrid electrometer system for measuring cloud charge. This instrument accurately measures charge across a wide range, from aerosols to thunderstorms, overcoming previous limitations.

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Area of Science:

  • Atmospheric science
  • Cloud physics
  • Instrumentation

Background:

  • Cloud electrification influences weather phenomena and atmospheric processes.
  • Accurate in-cloud charge measurements are crucial, requiring instruments with a wide dynamic range.
  • Existing electrometers face limitations such as saturation or thermal drift, hindering precise measurements.

Purpose of the Study:

  • To develop a novel hybrid electrometer system for accurate in-cloud charge measurements.
  • To overcome the dynamic range limitations and thermal sensitivity issues of current instruments.
  • To enable new opportunities for studying charge in clouds, dusts, and aerosols.

Main Methods:

  • A hybrid system combining linear and logarithmic electrometers was designed.
  • The system utilizes the stable performance of the linear electrometer for in situ calibration.
  • The hybrid design provides an extended dynamic range of ±50 pA.

Main Results:

  • The novel hybrid electrometer system demonstrates an extended dynamic range.
  • In situ calibration using the linear electrometer effectively compensates for logarithmic electrometer thermal effects.
  • Negligible temperature drift (±4%) was observed in the linear component.

Conclusions:

  • The hybrid electrometer system offers a robust solution for measuring a wide spectrum of charge densities in atmospheric conditions.
  • This innovation facilitates more accurate and comprehensive studies of cloud electrification and aerosol charging.
  • The system's design is suitable for disposable balloon-carried instruments, advancing atmospheric research.