Le tableau périodique des éléments est enfin complet. C'est un jour à marquer d'une pierre blanche pour tous les scientifiques : Slate rapporte que l'Union internationale de chimie pure et appliquée (IUPAC) a validé la découverte des quatre éléments qu'il manquait au tableau périodique des éléments. "Le quatrième groupe de travail mixte entre l'union internationale de chimie pure et appliquée et l''union internationale de physique pure et appliquée a passé en revue la documentation autour des éléments 113 («ununtrium»), 115 («ununpentium»), 117 («ununseptium»), et 118 («ununoctium»), et a déterminé que les affirmations de découverte de ces éléments étaient satisfaites. [...] Ces éléments complètent la septième ligne du tableau périodique des éléments, et les équipes japonaise, russe et américaines à l'origine de ces découvertes sont désormais invitées à suggérer des noms permanents et des symboles", écrit l'IUPAC dans un communiqué diffusé le 30 décembre.
Il reste maintenant à nommer ces éléments, dont les noms actuels sont provisoires. Lsr.php?u= Assembly of the Majorana Demonstrator Module 1 detectors. Twenty-nine detectors are arranged in seven strings and mounted in an ultra-low-radioactivity copper cryostat. The array is assembled inside a nitrogen-purged glovebox to avoid exposure to naturally occurring radon in the air. Credit: Image courtesy of Sanford Underground Research Facility In 2014, the Majorana Demonstrator started its search for neutrinoless double beta decay. Observation of this decay would have profound implications for our understanding of physics, including providing hints as to how the Big Bang produced more matter than it did antimatter. The 1st of 2 modules, with >22 kg of high purity germanium detectors, has been turned on. The Majorana experiment will search for neutrinoless double beta (0νββ) decay in germanium-76.
Majorana uses detectors made from germanium enriched in the isotope 76Ge. Test Your Knowledge of Science With This Quiz. What Does E=mc2 Truly Mean? What does E=mc2, the most famous equation in history, mean? (Image Credit: PBS Space Time) Albert Einstein remains one of the greatest minds in history. His contributions to the fields of cosmology, physics and mathematics are unquantifiable, but arguably, the most important works were his theories of general and special relativity.
Ultimately, they shed light on the intimate workings of the universe—from the nature gravity itself, to the outermost edges of black holes. If most people were to sum it up, they would say that the equation deals with the Mass–energy equivalence, which tells us that energy and matter are fundamentally the same thing. Over the course of a single year, we compile thousands of articles, and generate dozens upon dozens of high-quality videos and infographics. While the vast majority of websites have extensive teams of writers, editors, graphic designers, and videographers, FQTQ is run by just just two people: Jaime and Jolene. Leaving Facebook... Building Computers from DNA? | Science, Astronomy, Medical News & Updates. I-Motif DNA structures have previously been utilised for many different nanotechnological applications, but all have used changes in pH to fold the DNA. Herein we describe how copper(II) cations can alter the conformation of i-motif DNA into an alternative hairpin structure which is reversible by chelation with EDTA Scientists can now ‘switch’ the structure of DNA using copper salts and EDTA.
Ethylenediaminetetraacetic acid is an agent commonly found in shampoo and other household products. The applications for this discovery include nanotechnology – where DNA is used to make tiny machines, and in DNA-based computing – where computers are built from DNA rather than silicon. It could also be used for detecting the presence of copper cations, which are highly toxic to fish and other aquatic organisms, in water. It was previously known that the structure of a piece of DNA could be changed using acid, which causes it to fold up into “i-motif.”
Glogin?mobile=1&URI= Leaving Facebook... Protons and antiprotons appear to be true mirror images. In a stringent test of a fundamental property of the standard model of particle physics, known as CPT symmetry, researchers from the RIKEN-led BASE collaboration at CERN have made the most precise measurements so far of the charge-to-mass ratio of protons and their antimatter counterparts, antiprotons. The work, published in Nature, was carried out using CERN's Antiproton Decelerator, a device that provides low-energy antiprotons for antimatter studies. CPT invariance—which the experiment was meant to test —means that a system remains unchanged if three fundamental properties are reversed—C (charge), which distinguishes matter from antimatter, P (parity), which implies a 180 degree flip in space, and T (time). It is a central tenet of the standard model, and implies that antimatter particles must be perfect mirror images of matter, with only their charges reversed. To perform the research, the team used a scheme similar to that developed by the TRAP collaboration in the 1990s.
Leaving Facebook... Un neutrino de très haute énergie. Here's How You Can See Subatomic Particles At Home. New molecular transistor can control single electrons. Researchers from Germany, Japan and the United States have managed to create a tiny, reliable transistor assembled from a single molecule and a dozen additional atoms.
The transistor reportedly operates so precisely that it can control the flow of single electrons, paving the way for the next generation of nanomaterials and miniaturized electronics. For our electronics to become more powerful it's vital that the transistors, the tiny switches that make them up, keep getting smaller and smaller. However, there is a limit to just how much the silicon-based transistors as we currently use can shrink. A single silicon atom is about half a nanometer in size, meaning that, in the current generation of electronics, the terminals of the switch are only separated by around 30 atoms. Now, an international team from Paul-Drude-Institut für Festkörperelektronik (PDI), the Freie Universität Berlin (FUB), the NTT Basic Research Laboratories (NTT-BRL), and the U.S.
Source: U.S. EN IMAGES. Un nano-monde haut en couleurs. ATOME. À quoi peut bien ressembler le monde à l’échelle d’un atome ? Pour le savoir, regardez ces étonnantes images réalisées à l’aide d’un microscope à force atomique (AFM). Publiées par Oxford Instruments Asylum Research, un fournisseur américain de matériel de laboratoire, elles ont été sélectionnées lors d’un concours rassemblant des visuels scientifiques issus d’une quarantaine de pays. Saisies à l’échelle du nanomètre (un milliardième de mètre), ces images révèlent la beauté de matériaux comme le graphite, mais aussi de structures biologiques comme les cellules pulmonaires. Mise au point en 1985 par les physiciens allemand et suisse Gerd Binnig et Heinrich Rohrer (tous deux prix Nobel de physique en 1986), la microscopie à force atomique est l’une des rares techniques permettant de visualiser la matière à l’échelle du nanomètre.
L'AFM permet de visualiser des atomes ou la double hélice de l'ADN Champ d'application des différents types de microscopie. CARTOGRAPHIE. FORCES. Sciences. Découverte de nouvelles particules : les pentaquarks. Une nouvelle particule constituée de cinq quarks a été mise au jour par le LHC, le plus grand accélérateur de particules au monde, validant ainsi une hypothèse proposée en 1964. Alors qu’une grande partie de la communauté scientifique avait les yeux rivés vers l’espace, mardi 14 juillet, pour oberver la sonde New Horizons s’approcher au plus près de Pluton, une autre regardait 100 mètres sous terre, en direction du LHC (pour Large Hadron Collider), le plus grand accélérateur de particules au monde. Ce jour-là, le Cern annonçait avoir découvert une catégorie de particules dont on soupçonnait l’existence mais qu’on avait pourtant jamais pu démontrer jusqu’à présent : les pentaquarks.
Cette nouvelle particule est constituée de quatre quarks et d’un antiquark assemblés entre eux. Dans un article intitulé “Qu’est-ce qu’un pentaquark ? Et pourquoi cette minuscule particule est-elle si importante ?” A crash course in particle physics. Could black phosphorus be the next silicon? | Faculty of Medicine. New material could make it possible to pack more transistors on a chip, research suggests As scientists continue to hunt for a material that will make it possible to pack more transistors on a chip, new research from McGill University and Université de Montréal adds to evidence that black phosphorus could emerge as a strong candidate. In a study published today in Nature Communications, the researchers report that when electrons move in a phosphorus transistor, they do so only in two dimensions. The finding suggests that black phosphorus could help engineers surmount one of the big challenges for future electronics: designing energy-efficient transistors.
“Transistors work more efficiently when they are thin, with electrons moving in only two dimensions,” says Thomas Szkopek, an associate professor in McGill’s Department of Electrical and Computer Engineering and senior author of the new study. “Nothing gets thinner than a single layer of atoms.” Is the Future Already Written? Time off from Time Even though Ellis had reservations about time and the block universe, he still admired Einstein, and his respect deepened when he moved to Cambridge in 1960 to pursue a doctorate degree with world-renowned cosmologist Dennis Sciama. During his early years as a researcher, Ellis earned a reputation as a world-class cosmologist for his ability to tackle the tricky mathematics needed to fully solve some of Einstein’s space-time equations. Ellis respected Einstein’s mathematical ingenuity, but he later balked at the philosophical implications of the block universe, in which the future stands on the same footing as the past.
“If we are just machines living out a future that has already been set, then Adolf Hitler had no choice to do other than what he did; Hendrik Verwoerd, the architect of apartheid, had no choice,” Ellis says. It would be meaningless to tell them they were doing something wrong, he adds. Chopping the Block Universe. Experiment explains why quantum behaviour doesn’t occur in everyday life. An international team of researchers believe they've figured out why strange quantum behaviours occur at the level of individual particles, but aren't in the classical, everyday world. And it all comes down to Einstein's general theory of relativity and the effect of gravity on time. The research also explains why the cat in Erwin Schrödinger's famous thought-experiment is alive the whole time it's in the box.
The idea behind Schrödinger's cat, which was thought up by the Austrian physicist in 1935, was to demonstrate something known as quantum superposition - this is where an object is simultaneously in more than one state until the moment it's measured. For example, a cat inside a box would be both dead and alive, and would only truly be one or the other once someone opened the box to look at it. But while quantum superposition has since been demonstrated using atoms and molecules, we've never seen the weird quantum behaviour occur in anything bigger. Stephen Hawking says AI could spell the end of the human race. Professor Stephen Hawking has revealed in an interview with the BBC that he believes, “The development of full artificial intelligence could spell the end of the human race.” Since Professor Hawking is in possession of one of the most intelligent human brains on the planet, his words merit further examination, particularly since they come hot on the heels of similar warnings from Tesla and SpaceX CEO Elon Musk.
Hawking’s statement came in the context of discussing his new speech-enabling equipment, which is better able to predict his words based on his past usage patterns. While acknowledging the benefits of the limited artificial intelligence (AI) available today, in imagining a far more sophisticated technology he said: “It would take off on its own, and re-design itself at an ever increasing rate. Humans, who are limited by slow biological evolution, couldn’t compete, and would be superseded.” In a Tweet on 2 August, 2014, Elon Musk commented, “We need to be super careful with AI. UAB Researchers Design the Most Precise Quantum Thermometer to Date.
Printer friendly version Share 05 June 2015 Universitat Autònoma de Barcelona Physics at the UAB have found the “formula” to construct a quantum thermometer with enough precision to detect minute fluctuations in temperature in regions as small as the inside of a cell. The research appears today in the journal Physical Review Letters. Researchers from the UAB and the University of Nottingham, in an article published today in Physical Review Letters, have fixed the limits of thermometry, i.e., they have established the smallest possible fluctuation in temperature which can be measured.
The researchers have studied the sensitivity of thermometers created with a handful of atoms, small enough to be capable of showing typical quantum-style behaviours. The researchers characterised these types of probes in detail, devices which could provide an estimation of the temperature with a never before seen precision. The science behind the coolest candle trick ever. At ScienceAlert, we love to tell you guys about the technology and discoveries that could change our world for the better.
But we also love to show you the simple science behind much-loved party tricks, like this one. Because what good is science if you can't sometimes use it to impress strangers? As you can see above, you can blow out a candle and then light it again without ever touching the wick, simply by holding a flame to the smoke trail - just like magic. But what's actually going on here? The Slow Mo Guys decided to figure it out by filming the whole thing at 2,500 frames per second.
And the results are pretty beautiful: What's clear from this super-slow footage is that the smoke contains vaporised bits of wax that haven't fully burnt as yet. It's pretty simple stuff, but now next time someone tries to impress you with their magical candle-lighting skills, you'll be able to outdo them by explaining exactly what's going on. H/t to the Huffington Post for finding the video.
Quelles innovations sont les plus susceptibles de se diffuser durant la prochaine décennie? «La prédiction est un art difficile, surtout quand elle concerne le futur», disait Mark Twain. Dix écrivains anglo-saxons de science-fiction sollicités par le Huffington Post se sont prêtés au jeu et ont essayé d’imaginer quelles innovations pourraient marquer notre futur dans une décennie en se diffusant le plus largement. Leurs réponses montrent bien quels sont les facteurs qui peuvent faciliter, ou à l’inverse freiner, la diffusion d’une innovation: la demande sociale, le soutien des pouvoirs publics, le cadre législatif… Lauréat du prix Philip K.
Dick, David Walton annonce ainsi une explosion du secteur de l’automatisation à l’intérieur des maisons (ou domotique), utile spécialement pour les personnes âgées mais qui nécessitera des investissements publics massifs pour vraiment se populariser: «Imaginez simplement un robot ambulant qui vient quand vous l’appelez et vous présente un écran vidéo qui vous rappelle votre emploi du temps du jour. Partagez cet article A voir sur ce sujet. Évolution : un "chaînon manquant" découvert au fond des océans. Watch What Happens When You Stick Your Hand Into "Hot Ice" Uk.businessinsider. Icists stop and store light traveling in an optical fiber. ‘Cosmic barbeque’: Dying stars could give birth to DNA, study claims — RT USA. How to turn Light into Matter in LHC? | George Rajna.