April 16, 2022
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Fusing particles together
Nuclear fusion is the merging of two atomic nuclei into one compound nucleus. This nucleus then breaks apart and releases energy in the form of new atoms and particles that speed away from the reaction. A fusion power plant would capture the escaping particles and use their energy to generate electricity.
There are a few different ways to safely control fusion on Earth. Our research focuses on the approach taken by JET – using powerful magnetic fields to confine atoms until they are heated to a high enough temperature for them to fuse.
The fuel for current and future reactors are two different isotopes of hydrogen – meaning they have the one proton, but different numbers of neutrons – called deuterium and tritium. Normal hydrogen has one proton and no neutrons in its nucleus. Deuterium has one proton and one neutron while tritium has one proton and two neutrons.
For a fusion reaction to be successful, the fuel atoms must first become so hot that the electrons break free from the nuclei. This creates plasma – a collection of positive ions and electrons. You then need to keep heating that plasma until it reaches a temperature over 200 million degrees Fahrenheit (100 million Celsius). This plasma must then be kept in a confined space at high densities for a long enough period of time for the fuel atoms to collide into each other and fuse together.
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Fusion reactors smash two forms of hydrogen together (top) so that they fuse, producing helium and a high-energy neutron (bottom). Wykis/WikimediaCommons
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April 16, 2022
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April 15, 2022
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The muskox also spelled musk ox and musk-ox, plural muskoxen or musk oxen, is a hoofed mammal of the family Bovidae. Native to the Arctic, it is noted for its thick coat and for the strong odor emitted by males during the seasonal rut, from which its name derives. This musky odor has the effect of attracting females during mating season. Its Inuktitut name “umingmak” translates to “the bearded one”. Its Woods Cree names “mâthi-môs” and “mâthi-mostos” translate to “ugly moose” and “ugly bison”, respectively. Muskoxen primarily live in Greenland and the Canadian Arctic of the Northwest Territories and Nunavut, with reintroduced populations in the American state of Alaska, the Canadian territory of Yukon, and Siberia, and an introduced population in Norway, part of which emigrated to Sweden, where a small population now lives.
The muskox is in the subtribe Ovibovina (or tribe Ovibovini) in the tribe Caprini (or subfamily Caprinae) of the subfamily Antilopinae in the family Bovidae. It is more closely related to sheep and goats than to oxen; it is placed in its own genus, Ovibos (Latin: “sheep-ox”). It is one of the two largest extant members of the caprines, along with the similarly sized takin. While the takin and muskox were once considered possibly closely related, the takin lacks common ovibovine features, such as the muskox’s specialized horn morphology, and genetic analysis shows that their lineages actually separated early in caprine evolution. Instead, the muskox’s closest living relatives appear to be the gorals of the genus Naemorhedus, nowadays common in many countries of central and east Asia. The vague similarity between takin and muskox is therefore an example of convergent evolution. Wikipedia
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An image of a Muskox
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April 15, 2022
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In Wednesday’s issue of Nature, a new paper describes a potentially useful way of measuring the interactions between normal matter and exotic particles, like antiprotons and unstable items like kaons or elements containing a strange quark. The work is likely to be useful, as we still don’t understand the asymmetry that has allowed matter to be the dominant form in our Universe.
But the study is probably most notable for the surprising way that it collected measurements. A small research team managed to put an antiproton in orbit around the nucleus of a helium atom that was part of some liquid helium chilled down to where it acted as a superfluid. The researchers then measured the light emitted by the antiproton’s orbital transitions.
Why would anyone want to do this?
There are many reasons you’d want to get precise measurements of this sort of thing. For one, the measurements will be sensitive to the properties of antimatter and strange quarks, which are short-lived and are often created in environments that make precision measurements challenging. In addition, this system involves interactions between antimatter and regular matter, which can be difficult to capture due to their violent ends. Finally, the specific interactions here—between an atomic nucleus and an object in the orbitals that surround it—are sensitive to properties that are fundamental to the Universe.
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The hardware that slows down antiprotons so they can be used in these sorts of experiments.
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April 15, 2022
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April 15, 2022
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April 14, 2022
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The Seward Peninsula is a large peninsula on the western coast of the U.S. state of Alaska whose westernmost point is Cape Prince of Wales. The peninsula projects about 200 mi (320 km) into the Bering Sea between Norton Sound, the Bering Strait, the Chukchi Sea, and Kotzebue Sound, just below the Arctic Circle. The entire peninsula is about 210 mi (330 km) long and 90–140 mi (145–225 km) wide. Like Seward, Alaska, it was named after William H. Seward, the United States Secretary of State who fought for the U.S. purchase of Alaska.
The Seward Peninsula is a remnant of the Bering land bridge, a roughly thousand-mile-wide swath of land connecting Siberia with mainland Alaska during the Pleistocene Ice Age. This land bridge aided in the migration of humans, as well as plant and animal species, from Asia to North America. Excavations at sites such as the Trail Creek Caves and Cape Espenberg in the Bering Land Bridge National Preserve as well as Cape Denbigh to the south have provided insight into the timeline of prehistorical migrations from Asia to the Seward Peninsula.
Other locations on the Seward Peninsula include the mining towns of Council, Solomon, Candle, Haycock, and Taylor. While still frequented by locals of neighboring communities, there are no longer year-round residents in these locations. There is a United States Coast Guard LORAN station at Port Clarence. The U.S. Air Force operates a radar station at the “Tin City” site, 7 mi (11 km) southeast of Wales. The Seward Peninsula has several distinct geologic features. The Devil Mountain Lakes on the northern portion of the peninsula are the largest maar lakes in the world and part of the Espenberg volcanic field. They were formed over 21,000 years ago as the result of an underground steam explosion. The Killeak Lakes and White Fish Lake are also volcanic maar lakes of notable size on the northern Seward Peninsula. Four mountain ranges line the southern side of the peninsula, the most prominent being the Kigluaik (or Sawtooth) Mountains. The highest point in the range and the peninsula is the peak of 4,714 ft (1,437 m) Mount Osborn. Other mountain ranges on the Seward Peninsula include the Bendeleben Mountains, Darby Mountains, and York Mountains. The Bendeleben Mountains exhibit evidence of recent faulting in the late Cenozoic, with the majority of tectonic deformation and mountain formation occurring in the Cretaceous, which is attributed to regional tectonic block rotation of the Bering plate in the Arctic. The Lost Jim Lava Flow north of Kuzitrin Lake is a lava field formed roughly 1,000 to 2,000 years ago, which covers roughly 88 sq mi (230 km2). Wikipedia
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An image from Seward Peninsula Alaska
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April 14, 2022
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Within mathematics, there is a vast and ever-expanding web of conjectures, theorems and ideas called the Langlands program. That program links seemingly disconnected subfields. It is such a force that some mathematicians say it—or some aspect of it—belongs in the esteemed ranks of the Millennium Prize Problems, a list of the top open questions in math. Edward Frenkel, a mathematician at the University of California, Berkeley, has even dubbed the Langlands program “a Grand Unified Theory of Mathematics.”
The program is named after Robert Langlands, a mathematician at the Institute for Advanced Study in Princeton, N.J. Four years ago, he was awarded the Abel Prize, one of the most prestigious awards in mathematics, for his program, which was described as “visionary.”
Langlands is retired, but in recent years the project has sprouted into “almost its own mathematical field, with many disparate parts,” which are united by “a common wellspring of inspiration,” says Steven Rayan, a mathematician and mathematical physicist at the University of Saskatchewan. It has “many avatars, some of which are still open, some of which have been resolved in beautiful ways.”
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Credit: Boris SV/Getty Images
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April 14, 2022
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For a few weeks now, the chief of Russia’s spaceflight activities has said that the United States and its Western allies must end sanctions on his country by March 31 or face the consequences when it comes to partnering on the International Space Station.
After those sanctions remained in place at the end of March, the director-general of Roscosmos, Dmitry Rogozin, vowed to issue a response on April 2. True to his word, he did so early on Saturday morning. His full Twitter thread can be found here, but it is simple to summarize: more bluster, more threats, but likely little change.
In his new missive, Rogozin is still demanding “complete and unconditional” end of the Western sanctions on Russia, and he is still threatening to end the partnership on the International Space Station. Specifically, Rogozin said Roscosmos will soon send “specific proposals” to end its cooperation on the space station to the Russian government.
The tweets led to a firestorm of media coverage today, much of it saying that Russia will end its cooperation on the International Space Station (see, for example, here and here). Such coverage lacks a fundamental understanding of Dmitry Rogozin and Russia’s approach to spaceflight.
Cooperation on the space station will, of course, end at some point in the future. Some of the ISS’s hardware has been flying in space for nearly 25 years, and it will eventually age out. And while Russia could decide to end cooperation this month, that seems unlikely. Russia is currently committed to operating the station through 2024, and even as the war has raged in Ukraine, there have been talks about possibly extending operations to 2030.
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Roscosmos head Dmitry Rogozin is photographed in October 2018, after the launch failure of a Soyuz-FG rocket.
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April 14, 2022
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