A newfound volcano discovered near Minamitorishima Island, Japan, is a mere 3 million years old, which is quite young for the area.
New Zealand Prime Minister Jacinda Ardern has confirmed that many people remain unaccounted for after a volcano erupted on an island off the coast. Police say they don’t expect any more survivors.
A simple experiment, suitable for performing in an undergraduate physics laboratory, illustrates electromagnetic induction through the water entering into a cylindrical rubber tube by detecting the voltage developed across the tube in the direction transverse both to the flow velocity and to the magnetic field. The apparatus is a very simple example of an electromagnetic flowmeter, a device which is commonly used both in industrial and physiological techniques. The phenomenology observed is similar to that of the Hall effect in the absence of an electric current in the direction of motion of the carriers. The experimental results show a dependence on the intensity of the magnetic field and on the carrier velocity, in good agreement with the theory. Discussion of the system, based on classical electromagnetism, indicates that the effect depends only on the flow rate, and is independent both of the velocity profile and of the electrical conductivity of the medium.
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The applications of spin dynamos, which could potentially power complex nanoscopic devices, have so far been limited owing to their extremely low energy conversion efficiencies. Here, we present a unique plasmonic diabolo cavity (PDC) that dramatically improves the spin rectification signal (enhancement of more than three orders of magnitude) under microwave excitation; further, it enables an energy conversion efficiency of up to ~0.69 mV/mW, compared with ~0.27 μV/mW without a PDC. This remarkable improvement arises from the simultaneous enhancement of the microwave electric field (~13-fold) and the magnetic field (~195-fold), which cooperate in the spin precession process generates photovoltage (PV) efficiently under ferromagnetic resonance (FMR) conditions. The interplay of the microwave electromagnetic resonance and the ferromagnetic resonance originates from a hybridized mode based on the plasmonic resonance of the diabolo structure and Fabry-Perot-like modes in the PDC. Our work sheds light on how more efficient spin dynamo devices for practical applications could be realized and paves the way for future studies utilizing both artificial and natural magnetism for applications in many disciplines, such as for the design of future efficient wireless energy conversion devices, high frequent resonant spintronic devices, and magnonic metamaterials.
In 2007, Y. S. Gui, et al.1 first proposed and demonstrated the spin dynamo, first proposed and demonstrated the spin dynamo, is constructed that provides a new and interesting way to generate direct current via spin precessions to locally power nanoscopic devices and for future applications such as wireless energy conversion. Compared with the spin-driven currents in semiconductors2, spin dynamos are based on ferromagnetic materials1 or spin-torque diodes3, 4, which feature a much higher current/power ratio coupled with a much smaller internal resistance. However, the reported works are limited to sophisticated waveguide couplings (and therefore to wires), such as coplanar waveguides (CPWs)5, 6, microstrip lines7, 8, and bias Tees3, 9 –12, to in-couple radio-frequency or microwave electromagnetic waves. Free space direct illumination has rarely been studied, despite its excellent suitability for wireless energy conversion.
The Kardashev Scale ranks civilisations based on how advanced they are… and, according to Carl Sagan, humans are currently Type Zero! So, what would happen if humanity reached Type I on the Kardashev Scale? What sorts of technologies would be available to us? And how different would our lives be? In this video, Unveiled finds out…
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Franken-Furters 😮
The two chimera piglets died within a week of being born. They were created after more than 4,000 attempts to implant embryos into sows. Research was carried out in Beijing, China.
Leaving a vulnerable system unpatched can invite troubles for an organization. The issue can turn worse when the organization suffers a cyberattack that can result in, but not limited to, compromise of confidential data, DDoS attacks or stealing of customers’ details.
According to a report released by Recorded Future, it has been found that the same vulnerabilities kept showing up year-after-year. An interesting aspect of the report was that most of these vulnerabilities were found to be exploited via phishing attacks and exploit kits that specifically target flaws in Microsoft products.
300 miles off the coast of Oregon lies an active volcano, with a magma reservoir two thirds the length of Manhattan, that the world has never seen before.
