Next-gen atomic clocks run at optical frequencies. The best of them can remain precise to within a second after 50 billion years. And soon, for the first time, you’ll be able to buy one of your very own.
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💧 Water droplets move faster down bundles of fibres than down individual fibres – even when the total perimeter of the two structures is identical.
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If you stack five layers of graphene together, it becomes multiferroic, exhibiting both unconventional magnetism and an exotic electronic behaviour dubbed “ferro-valleytricity”. These properties could be exploited in graphene information-storage devices.
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Speakers at Acoustics 2023 Sydney shared the latest innovations in ultrasound technologies, including pain-free vaccination and monitoring muscle dynamics in real time.
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The 200-year-old mystery of how the mineral dolomite forms may have finally been solved by a combination of computer simulations and electron microscopy.
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Poynting Vector
In physics, the Poynting vector (or Umov–Poynting vector) represents the directional energy flux (the energy transfer per unit area, per unit time) or power flow of an electromagnetic field. The SI unit of the Poynting vector is the watt per square metre (W/m2); kg/s3 in base SI units. It is named after its discoverer John Henry Poynting who first derived it in 1884. Nikolay Umov is also credited with formulating the concept. Oliver Heaviside also discovered it independently in the more general form that recognises the freedom of adding the curl of an arbitrary vector field to the definition. The Poynting vector is used throughout electromagnetics in conjunction with Poynting's theorem, the continuity equation expressing conservation of electromagnetic energy, to calculate the power flow in electromagnetic fields.
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In physics, the Poynting vector (or Umov–Poynting vector) represents the directional energy flux (the energy transfer per unit area, per unit time) or power flow of an electromagnetic field. The SI unit of the Poynting vector is the watt per square metre (W/m2); kg/s3 in base SI units. It is named after its discoverer John Henry Poynting who first derived it in 1884. Nikolay Umov is also credited with formulating the concept. Oliver Heaviside also discovered it independently in the more general form that recognises the freedom of adding the curl of an arbitrary vector field to the definition. The Poynting vector is used throughout electromagnetics in conjunction with Poynting's theorem, the continuity equation expressing conservation of electromagnetic energy, to calculate the power flow in electromagnetic fields.
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Ultrasound-activated inks could print 3D structures inside the human body.
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A thermal transistor that uses an electric field to control the flow of heat could cool computer chips or even reveal how living cells regulate heat at the molecular level.
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Permittivity
In electromagnetism, the absolute permittivity, often simply called permittivity and denoted by the Greek letter ε (epsilon), is a measure of the electric polarizability of a dielectric. A material with high permittivity polarizes more in response to an applied electric field than a material with low permittivity, thereby storing more energy in the material. In electrostatics, the permittivity plays an important role in determining the capacitance of a capacitor.
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In electromagnetism, the absolute permittivity, often simply called permittivity and denoted by the Greek letter ε (epsilon), is a measure of the electric polarizability of a dielectric. A material with high permittivity polarizes more in response to an applied electric field than a material with low permittivity, thereby storing more energy in the material. In electrostatics, the permittivity plays an important role in determining the capacitance of a capacitor.
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Smart glasses use acoustic touch technology to help blind people ‘see’ using sound.
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Handheld device uses eye-safe retinal spectroscopy to diagnose traumatic brain injury.
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