From how food is grown to how we generate power, Vaclav Smil’s new book outlines the basic technologies that keep society going and commands us to know them better.
Quantum magnets can be studied using high-resolution spectroscopic studies to access magnetodynamic quantities including energy barriers, magnetic interactions, and lifetime of excited states. In a new report now published in Science Advances, Sascha Brinker and a team of scientists in advanced simulation and microstructure physics in Germany studied a previously unexplored flavor of low-energy spin excitation for quantum spins coupled to an electron bath. The team combined time-dependent and many-body perturbation theories and magnetic field-dependent tunneling spectra to identify magnetic states of the nanostructures and rationalized the results relative to ferromagnetic and antiferromagnetic interactions. The atomically crafted nanomagnets are appealing to explore electrically pumped spin systems.
Anomalous magnetodynamics
Magnetodynamics at the atomic scale form the cornerstone of spin-based nanoscale devices with applications in future information technologies. Interactions of local spin states also play a crucial role with the local environment to determine their properties. Researchers have described the impact of orbital hybridization effects, charge transfer, and the presence of nearby impurities as strong influencers on the magnetic ground state, to determine a range of magnetodynamic qualities, including magnetic anisotropy, spin lifetime and spin-relaxation mechanisms. Experimental methods can be developed to directly capture these properties and analyze the magnetic phenomena of classical and semiclassical descriptions at sub-nanometer scales to reveal the emergence of exquisite quantum mechanical effects.
Blockchain may one day eliminate inefficiencies and lack of transparency in supply chains. While slow in coming, this revolution would benefit not only customers and brands, but the invisible” workers who power global trade.
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Startup Scitem sees cartridge-based system paving way for mobility solutions.
KANAZAWA, Japan — Japanese startup Scitem will begin marketing this spring a portable emergency power generation system fueled by replaceable hydrogen cartridges.
Power all the things.
YouTuber Handy Geng built a massive 27,000,000mAh power bank that is capable of recharging any device and even powering a washing machine.
The movements are driven by a chemical reaction that consumes molecular energy for this purpose.
It plays a significant role in our lives.
From enabling us to walk around and not bump into things to developing highly advanced directed energy weapons, the electromagnetic spectrum is vitally important to many aspects of our modern lives. But, life as we know it would also not be possible if electromagnetic radiation, notably visible light, did not exist.
For most of human history we have only known (but not fully understood) a very small portion of the spectrum — namely visible light and “heat” in the form of infrared light. But, since the scientific enlightenment our knowledge of the spectrum, and applications using it, have literally revolutionized the way we live and perceive the world and the cosmos around us.
Electrolysis is a key component of the cost of green hydrogen, and a Korean team says it’s made a huge breakthrough with an anion exchange membrane that’s not only much cheaper than current proton exchange tech, but offers some 20 percent better performance.
Electrolysis is the process of splitting water into hydrogen and oxygen, and when powered by renewable energy, it’s shaping up to be a key step in the production of green hydrogen. Green hydrogen is set to play a substantial role in the race to zero emissions, offering a high energy density that makes it an attractive option in several hard-to-decarbonize activities where batteries just don’t make sense.
Typically, electrolyzers use proton exchange membranes (PEMs), in which an anode and a cathode in an electrolyte material are separated by a membrane designed to allow positively-charged hydrogen ions to pass through as they’re attracted by the cathode. Here they combine with electrons to form hydrogen gas, which is collected, and oxygen is released at the anode.
Imagine if we could use strong electromagnetic fields to manipulate the local properties of spacetime—this could have important ramifications in terms of science and engineering.
Electromagnetism has always been a subtle phenomenon. In the 19th century, scholars thought that electromagnetic waves must propagate in some sort of elusive medium, which was called aether. Later, the aether hypothesis was abandoned, and to this day, the classical theory of electromagnetism does not provide us with a clear answer to the question in which medium electric and magnetic fields propagate in vacuum. On the other hand, the theory of gravitation is rather well understood. General relativity explains that energy and mass tell the spacetime how to curve and spacetime tells masses how to move. Many eminent mathematical physicists have tried to understand electromagnetism directly as a consequence of general relativity. The brilliant mathematician Hermann Weyl had especially interesting theories in this regard. The Serbian inventor Nikola Tesla thought that electromagnetism contains essentially everything in our universe.
