Energy & Green Tech

Enhancing radiative cooling with aperture mirror structures

In a world where rising temperatures increase the demand for cooling, traditional air conditioning (AC) systems contribute significantly to global energy consumption. They also heat Earth overall: to cool down a certain volume ...


Novel robot mimics insects' optics-to-neurons pathway

With a brain the size of a pinhead, insects perform fantastic navigational feats. They avoid obstacles and move through small openings. How do they do this with their limited brain power? Understanding the inner workings ...

Electronics & Semiconductors

Preventing catastrophic failure in lithium ion batteries

In a recent study published in Advanced Energy Materials, a team of ANSTO scientists, led by Prof. Vanessa Peterson, used neutron scattering techniques to understand the formation of harmful lithium structures in rechargeable ...


Human lung-inspired sensor monitors nitrogen dioxide in real-time

A research team has developed a human lung-inspired graphene-metal organic framework hybrid gas sensor, which can monitor extremely low concentrations of nitrogen dioxide at the level of one billionth in real-time. This study ...

Energy & Green Tech

Researchers design battery prototype with fiber-shaped cathode

In a new study, North Carolina State University researchers made a cathode in the shape of a thread-like fiber. The researchers were then able to use the fiber to create a zinc-ion battery prototype that could power a wrist ...

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Surface area

Surface area is the measure of how much exposed area a solid object has, expressed in square units. Mathematical description of the surface area is considerably more involved then the definition of arc length of a curve. For polyhedra (objects with flat polygonal faces) the surface area is the sum of the areas of its faces. Smooth surfaces, such as a sphere, are assigned surface area using their representation as parametric surfaces. This definition of the surface area is based on methods of infinitesimal calculus and involves partial derivatives and double integration.

General definition of surface area was sought by Henri Lebesgue and Hermann Minkowski at the turn of the twentieth century. Their work led to the development of geometric measure theory which studies various notions of surface area for irregular objects of any dimension. An important example is the Minkowski content of a surface.

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