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Related Concept Videos

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

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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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Reflection of Waves01:07

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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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The Sense of Self: Reflected Self-Appraisal and Social Comparison02:57

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According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
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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.
The maximum gain occurs at the breakaway points between open-loop poles on the real axis, while the minimum gain is...
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Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans
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Calibrating UVA reflectance photographs - standardisation using a low-cost method.

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  • 1a JMC Scientific Consulting Ltd. , Egham , UK.

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A new, cost-effective method creates UVA calibration targets for accurate reflectance photography. These standards, unlike visible light ones, show distinct UVA behavior for applications in forensics and biology.

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Area of Science:

  • Photographic Science
  • Spectroscopy
  • Imaging Technology

Background:

  • Established calibration methods for visible light photography lack clear application in UVA reflectance photography.
  • Accurate calibration is crucial for quantitative analysis in UVA imaging.
  • Existing visible light calibration standards perform differently under UVA illumination.

Purpose of the Study:

  • To develop a systematic, low-cost, and simple method for producing grey calibration standard targets for UVA reflectance photography.
  • To emphasize the creation of standards with low reflectivity surfaces.
  • To compare the performance of these new UVA standards with existing visible light photographic standards.

Main Methods:

  • Grey calibration standard targets were produced using optimized literature methods for the UVA region.
  • Standards were assessed via UV-Visible reflection spectroscopy and UVA/visible light photography.
  • Performance was compared against a commercial visible light calibration chart.

Main Results:

  • Prepared calibration standards exhibit a relatively flat reflection response in the UVA region.
  • Standards offer a range of reflectances from 2% to 35%.
  • Imaging revealed significant differences between the new UVA standards and visible light standards.

Conclusions:

  • A simple, low-cost method for producing low-reflectance UVA calibration targets suitable for UVA reflectance photography is presented.
  • The new UVA standards demonstrate suitability for UVA reflectance photography.
  • These standards have potential applications in fields such as forensics, biology, and cosmetic science.