The walls of a medieval church of Álava hid figures of wild boars, turkeys and discs. No one knows what they do there

Cruces, Statues of saints, fresh with biblical scenes, representations of the Virgin Mary or the apostles, even devil figures twisting. Within a church one expects to find a wide range of Christian imagery, but when A few years ago Historians began to clean the oldest wall of The Church of ArbuloIn Álava, they found something very different. Under layers and layers of lime and paint began to appear something other: figures of the 12th century that show mysterious quadrupeds with claws, faced birds and wheels. Now the experts They wonder What the hell do they mean. In a place in Álava … More specifically in Arbulo, in the municipality of Elburghe stands An ancient church in honor of San Martín de Tours. Most of the temple we see today rose between End of the fifteenth century and the beginning of the XVI, but its builders left the remains of a previous building, from the Romanesque era. Despite its historical value over time the Church ended in a dilapidated state. At the end of the XX its roof deteriorated and began to leak water through the vaults, which among other things ended up the furniture. Rescue Restorers. The temple situation was so critical that it was closed Between 1999 and 2008 and by 2004 a restoration was launched that included the disenchanted of the walls. The specialists had good reasons to do so. As remember Historian Gorka López de Munain, from the University of the Basque Country (UPV), moisture forced to remove the altarpiece and disagree with the walls of the apse, which left the layers of paint accumulated over the centuries, including what seemed “strange motifs of reddish hue.” What kind of paintings? The experts appreciated several layers on the walls, but there was a specific one that caught so much the attention of López de Munain that he decided to dedicate A broad article in Of half avo. Which? The first, located in the Apsid wall and that in the absence of more detailed analysis the researcher date between the twelfth and thirteenth centuries, so it is associated with the primitive Romanesque temple. Today we know that their author (or authors) traced them using ocher pigments mixed with binder and that they did not remain too exposed. Before the XV they were already covered with a new layer of lime. And the big surprise arrived. The most curious thing is not, however, with what pigments were prepared, but what they were used for. In a Christian temple one would expect to meet symbols associated with that creed: crosses, representations of Christ and the Virgin, biblical scenes … not on the wall of the Church of Arbulo. Over there, In words of the UPV teacher, what appeared were representations of animals and geometric shapes “in a seemingly random disposition.” In a wide surface, of just over 24 square meters (m2), experts found remains that at origin had to decorate the head of the primitive church and have bullow the curiosity and imagination of historians. “In this first layer, reasons of great variety and formal wealth were painted: swine -siled quadr The article of Of half avowhich recognizes that the figures of the absidal wall of the Church of Arbulu “do not respond to the best known repertoires of their time.” “Something unexpected”. López de Munain is not the only one to which the images of the temple have surprised. In 2018, in An interview With eitb.eus, Isabel Mellén, of the project ‘Medieval Álava’, I recognized His enthusiasm. “What was painted, in our eyes, is something unexpected. What we hope to find in a church are religious paintings, with Christian scenes or symbology, but what is shown in Arbulo has nothing to do with all that,” collects the analysis of the Basque chain. Instead of pantocradors or crosses What they show The walls of the temple with thick strokes and reddish tones are beasts: birds, animals with pigs or wild boars, discs with radios, asterisk shape of lis flowers drawn with basic and rough lines … a peculiar iconography that leaves a question as fascinating as difficult to answer: What do you mean exactly? Questioning the story. From the outset and after clarifying how difficult it is to interrogate the images in search of meanings with the eyes of the 21st century, the researcher slides an idea: at least part of the figures seem to reveal a funeral connotation. For example, among the images rescued in Arbulo there are real turkeys, a recurring theme throughout the Middle Ages, loaded with polysemy and has been used regularly in mortuary contexts. “The fated birds painted in Arbulu inevitably evoke those that drink together of a crater or peck a cluster of grapes, common in the steles and romantic and very frequent tombst Point out The Basque researcher, who recognizes in any case that in the images of Arbulu the birds do not appear with other icons, such as drinks, so “its nature is difficult to identify” and “elusive”. Are there more meanings? Yes. In his analysis the researcher pays attention to other elements that have emerged on the Arbulu wall, such as eight radios albums. “Those wheels or radiated stars appear frequently in the discoude steles of both the Basque Country and of nearby regions,” Slide. Its meaning is also suggestive and invites you to look, rather than consecration crosses, to designs that can often be seen in medieval funeral steles. The tree figures have also led him to slide the hypothesis that they can be linked to the paintings of a historical character, Gastea de Arburu, of Gallic origin but buried in the region. But … why? The big question. Why paint a Christian temple with birds, solar disks and quadrupeds with claws, some with the appearance of wild boars? In An interview with The country López de Munain slides some theories, such as their creators wanted to represent on the walls what they saw in their most immediate environment or … Read more

The good news is that there is a material that works well on the walls of fusion reactors. The bad: it is lithium

We know how the sun works. Another thing is to imitate it. If we got Build a nuclear fusion reactorwe would have clean, safe and practically unlimited energy. But doing so involves incredibly complex engineering challenges. The wall problem. One of the more colossal challenges In nuclear fusion is to build a container that supports a hottest plasma than the sun’s core. For years, scientists have been experiencing with various materials, from graphite to high resistance metals such as tungsten. A recent researchthe result of an international collaboration of nine institutions, confirms that we have a star candidate that works spectacularly well for the wall of the reactors: lithium. A self -refrasinal shield. To understand why lithium is so attractive, you must first visualize the hell that is unleashed inside a tokamak, the most common fusion reactor design. A hydrogen gas, mainly its deuterium and tritium isotopesmore than 100 million degrees Celsius is heated to become a plasma. Magnetic fields potently confine it so that it does not touch anything, but it is impossible to prevent some particles from escaping and violently shocking against the interior walls of the reactor. This is where lithium shines because it can be used in a liquid state. Instead of eroding and degrading with each impact, it flows and heals himself instantly. This self -referential liquid layer would protect the solid components behind. Moreover, if the reactor walls are hot enough, the lithium can form a steam shield that absorbs much of the impact before it reaches the solid surface. Goodbye to graphite? Research shows that lithium is not only a passive shield, but an active plasma conditioner. Instead of reflecting the fuel particles that escape, cooling the edge of plasma and destabilizing it, lithium absorbs them. This helps keep heat where it has to be and, therefore, to stabilize the fusion reaction and improve the confinement of plasma. According to researchers, lithium is a promising candidate to replace graphite, which has a much higher erosion rate. Applied in tungsten walls, it allows to operate the fusion to greater power densities, opening the door to more compact and efficient reactors. Two ways to apply it. The researchers tested, on the one hand, to cover the lithium walls before lighting the plasma and, on the other, to inject lithium powder directly on the plasma during the reactor operation. The injection was much more effective when creating a uniform and stable temperature profile, one of the sacred conditions for commercial fusion. All tests were carried out at the Tokamak Diii-D of General Atomics with financing from the United States Department of Energy. The authors of the study, published in the Materials and Energy nuclear magazine, are researchers of the Princeton plasma physics laboratory and his collaborators. Bad news. In addition to exercising even more pressure on the already tensioning lithium market (Although it does not scarce, it is not extracted to the rhythm that grows its demand), there is a more alarming problem. The lithium is too much Well at work. Catch the tritium with a very high efficiency, preventing it from returning to plasma to be used as fuel. If the tritio is stuck to the walls, the reactor ends up running out of fuel and the cycle breaks. The accumulation of radioactive tritium in cold areas and difficult to access the reactor also greatly complicates its maintenance and is a safety risk. To top it off, the retention is more significant if the lithium is injected with the reactor in operation, the most efficient application method. A possible solution. The key is that these experiments were carried out with lithium in solid state, at temperatures below its melting point. In a real reactor, with liquid lithium, The solution could be a “dialysis” system: Instead of bathing the walls by a lithium river and leaving it there, it would be continuously extracted from the reactor, taken to a processing plant to separate the tritium trapped, and pumped back, clean and ready to continue working. The reactor design would have to adapt to this new proposal. It would be necessary to avoid the cold areas where lithium and tritio could accumulate and stay stagnant, keep the walls at higher and more controlled temperatures, and include the circuit to extract, processes and continuously introduce lithium. A material that solves multiple problems in our mission of simulating the sun, but in return introduces new and also complex. Image | General Atomics In Xataka | There is an alternative to nuclear fusion. It is already underway and is extraordinarily promising

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