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Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
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Concrete is a fundamental building material, and understanding its strengths is crucial for construction projects. The relationship between its tensile and compressive strengths is intricate, showing that while these strengths are related, they do not increase at the same rate. Tensile strength's growth is slower and is affected by various factors such as the methods used for testing, the size and shape of the specimen, the texture of the aggregate used, and the moisture content of the...
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The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
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Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
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Updated: Jan 21, 2026

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

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Material surface properties modulate vection strength.

Yuki Morimoto1, Hirotaro Sato1, Chihiro Hiramatsu1

  • 1Faculty of Design, Kyushu University, 4-9-1 Shiobaru, Minami-ku, Fukuoka, 815-8540, Japan.

Experimental Brain Research
|August 12, 2019
PubMed
Summary
This summary is machine-generated.

Material surface properties significantly impact visually induced self-motion perception (vection). Realistic textures like wood and stone enhance vection, while smooth surfaces like glass do not, revealing key visual factors influencing motion perception.

Keywords:
Computer graphicsMaterialSimulationSpatial frequencySurface propertiesVection

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Area of Science:

  • Visual perception
  • Human-computer interaction
  • Neuroscience

Background:

  • Vection, or visually induced self-motion perception, is influenced by visual field complexity.
  • Previous studies on how material surface properties affect vection have yielded inconsistent results.

Purpose of the Study:

  • To investigate the influence of diverse material surface properties on vection strength.
  • To identify specific visual features that modulate vection.

Main Methods:

  • Computer graphics were used to create 3D tunnel simulations with nine distinct material surfaces (bark, ceramic, fabric, fur, glass, leather, metal, stone, wood).
  • Stimuli featured interactive appearance changes, realistic lighting, 3D geometry, color, and occupied a large visual field.
  • Optic flow was generated as observers virtually navigated the tunnels.

Main Results:

  • Materials like bark, fabric, leather, stone, and wood induced strong vection.
  • Ceramic, glass, fur, and metal resulted in weaker vection.
  • Regression analyses indicated that lighting and spatial frequency amplitude were key modulators of vection strength.
  • Perceived depth, smoothness, and rigidity of surfaces correlated with vection strength.

Conclusions:

  • Material surface properties demonstrably modulate vection strength.
  • Low-level image features and subjective material properties play crucial roles in vection.
  • This research clarifies the relationship between visual realism and self-motion perception.