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Related Concept Videos

Light Acquisition02:16

Light Acquisition

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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Flame Photometry: Lab01:16

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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Flame Photometry: Overview01:02

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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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Light as Energy01:35

Light as Energy

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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the...
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The Visible Cement Data Set.

Dale P Bentz1, Symoane Mizell1, Steve Satterfield1

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899-0001, USA.

Journal of Research of the National Institute of Standards and Technology
|July 23, 2016
PubMed
Summary
This summary is machine-generated.

Researchers have released the Visible Cement Data Set, featuring 3-D microstructural images of hydrating cement, plaster, and brick. This valuable resource aids in analyzing material science with advanced X-ray microtomography data.

Keywords:
Plaster of Pariscement hydrationimage analysismicrostructurevisualizationx-ray microtomography

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Geology

Background:

  • X-ray microtomography enables high-resolution 3-D imaging of material microstructures.
  • Detailed microstructural data is crucial for understanding material behavior and performance.

Purpose of the Study:

  • To present the Visible Cement Data Set, a collection of 3-D microstructural data.
  • To provide researchers with raw data, processing tools, and example visualizations for cementitious materials and building components.

Main Methods:

  • Utilized X-ray microtomography at the European Synchrotron Radiation Facility (ESRF).
  • Acquired 3-D datasets with voxel sizes under one micrometer.
  • Collected data for hydrating portland cement pastes, Plaster of Paris, and building brick.

Main Results:

  • Generated a comprehensive dataset of 3-D microstructural information for various materials.
  • Developed accompanying C language programs for data analysis.
  • Made raw data, material descriptions, and visualizations publicly accessible online.

Conclusions:

  • The Visible Cement Data Set offers a valuable resource for the scientific community.
  • Facilitates advanced research in cement science, material characterization, and construction technology.
  • Promotes further investigation into the microstructural properties of building materials.