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Related Concept Videos

Permeability of Concrete01:25

Permeability of Concrete

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Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...
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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
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Physiological barriers are semi-permeable cellular structures restricting drug diffusion into intracellular compartments and tissues. There are six types of physiological barriers: blood endothelial, cell membrane, blood-brain, blood-cerebrospinal fluid (CSF), blood-placenta, and blood-testis barriers.
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After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt secretion,...
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Related Experiment Video

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Encapsulation and Permeability Characteristics of Plasma Polymerized Hollow Particles
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Permeability theory and Palace Athena.

Arthur E Stamps1

  • 1Institute of Environmental Quality, San Francisco, California 94110, USA. InstituteOfEnvironmentalQuality@comcast.net

Perceptual and Motor Skills
|November 2, 2013
PubMed
Summary

Permeability theory links environmental safety to how easily people perceive and move through spaces. This study found that visual permeability, not boundary depth, significantly impacts feelings of enclosure in architectural environments.

Area of Science:

  • Environmental Psychology
  • Architectural Theory
  • Perception Studies

Background:

  • Permeability theory posits that environmental safety is related to the ease of perception and locomotion.
  • Environmental features limiting perception or movement create a sense of enclosure.
  • Understanding perceived enclosure is key to permeability theory.

Purpose of the Study:

  • To test predictions of permeability theory regarding perceived enclosure.
  • To investigate the influence of boundary permeability and depth on perceived enclosure.
  • To explore these concepts within the context of architectural spaces.

Main Methods:

  • 30 participants rated perceived enclosure for 18 virtual stimuli.
  • Stimuli were based on a Greek temple (Tholos in Delphi) with column boundaries.

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  • Boundaries varied in visual permeability and depth.

    • Main Results:

    • Perceived enclosure was significantly influenced by the visual permeability of boundaries.
    • Boundary depth had a minimal effect on perceived enclosure.
    • Findings support the role of visual permeability in spatial perception.

    Conclusions:

    • Visual permeability is a primary factor in determining perceived enclosure.
    • Boundary depth plays a lesser role in how enclosed a space feels.
    • Permeability theory's predictions are supported by empirical evidence in architectural settings.