| 单词 | Dirac |
| 例句 | The discovery of the positron in 1932 confirmed Dirac’s theory and led to his being awarded the Nobel Prize for physics in 1933. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z His confidence was based on the recent discovery by Dirac of the equation that governed the electron. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z Dirac’s theory was the first of its kind that was consistent with both quantum mechanics and the special theory of relativity. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z This approach led Heisenberg, Erwin Schrodinger, and Paul Dirac in the 1920s to reformulate mechanics into a new theory called quantum mechanics, based on the uncertainty principle. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z One of the greatest physicists of the last century, Paul Dirac, had no use for emotions. What Role Do Emotions Play in the Way Our Brains Work? 2022-01-05T05:00:00Z As part of Spill Festival, Kings of England will be documenting the life of eccentric physicist Paul Dirac. Stage chemistry: the marriage of science and theatre is going strong 2011-03-09T14:13:20Z Examples include Einstein's equation of general relativity, Dirac's equation for the electron and the Lagrangian at the heart of the standard model of particle physics. The beauty of the Higgs boson 2012-08-04T23:05:33Z He profiles and retro-diagnoses likely autists from history, such as Henry Cavendish, who discovered hydrogen, and the quantum physicist Paul Dirac. The man who wants us to embrace autism 2015-08-29T04:00:00Z Here is a book that ticks off the reactions of Einstein, Planck, Heisenberg, Born and Dirac to Schrödinger’s “wave mechanics,” and shows how remarkably smoothly Oppenheimer insinuated himself into those ranks. Books of The Times: ‘Robert Oppenheimer: A Life Inside the Center,’ by Ray Monk 2013-05-27T21:46:27Z Although not as famous as Schrödinger and Heisenberg, Dirac was a master of the subject who clarified many of its early roots and pressed on to build a version that was compatible with Einstein's relativity. David Kaiser's top 10 books about quantum theory 2012-09-26T12:02:55Z Dirac's beautiful equation is just like that – it describes the electron and predicts the existence of its anti-matter partner, the positron. The beauty of the Higgs boson 2012-08-04T23:05:33Z While 2π is associated with completing a circle in mathematics, our measurements are about the geometric phase accumulated by the BEC's wave function after it completes a circle around either the Dirac or singular QBTP. Readers Respond to the June 2023 Issue 2023-10-21T04:00:00Z Many land owners now are battling fast-spreading eastern red cedar and juniper trees that are contributing to the grassland ecosystem collapse, says Dirac Twidwell, a rangeland ecologist at the University of Nebraska. North American grassland birds in peril, spurring all-out effort to save birds and their habitat 2023-08-25T04:00:00Z Nearly a century ago the theorist Paul Dirac calculated a value, called g, for how much a charged particle should be affected by a magnetic field. Muon Mystery Deepens with Latest Measurements 2023-08-10T04:00:00Z To me, the most intriguing thing about graphene is that its band structure contains special spots known as Dirac points. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z In particular, the electron can be thought of as an excitation in a quantum field known as the Dirac field, and this field may be what carries the spin of the electron. Quantum Particles Aren’t Spinning. So Where Does Their Spin Come From? 2022-11-22T05:00:00Z But Dirac's theory also predicted negative energy states for free electrons. College Physics for AP Courses 2015-08-12T00:00:00Z According to a formula derived in 1928 by Paul Dirac, the English theoretical physicist and a founder of quantum theory, the g factor of a lone muon should be 2. A Tiny Particle’s Wobble Could Upend the Known Laws of Physics 2021-04-07T04:00:00Z He was soon bustling at the frontiers of theoretical physics with its quantum royalty, including Niels Bohr, Werner Heisenberg, Max Born and Paul Dirac. Remembering Freeman Dyson 2020-04-12T04:00:00Z One way to understand Dirac points is to study a plot of the energy of different bands versus an electron's momentum— a property associated with the particle's kinetic energy. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z “There’s a real rotation of energy and charge in the Dirac field,” Sebens says. Quantum Particles Aren’t Spinning. So Where Does Their Spin Come From? 2022-11-22T05:00:00Z Born in 1915, Hoyle studied at the University of Cambridge under physicist and Nobel laureate Paul Dirac. Remembering Big Bang Basher Fred Hoyle 2020-04-11T04:00:00Z They observed that a structure in the surface electron bands, known as a Dirac cone, is modified near and below the temperature at which the material becomes antiferromagnetic. Magnetic and topological order united in a crystal 2019-12-17T05:00:00Z Dirac and Einstein were hardly involved in those developments. A struggle for the soul of theoretical physics 2019-04-15T04:00:00Z In these plots, a Dirac point looks like a place where two energy bands touch; at this point they're equal, but away from this point the gap between the bands grows linearly. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z The resulting real compound does not behave like a Dirac semimetal. Beware of plausible predictions of fantasy materials 2019-02-26T05:00:00Z Their partnership worked well, Hoyle once said, since he didn't want a mentor and Dirac didn't want to be one. Remembering Big Bang Basher Fred Hoyle 2020-04-11T04:00:00Z This Dirac cone is the distinguishing feature of the surface of a topological insulator, and its disappearance is a sign that the surface has been converted from conducting to insulating. Magnetic and topological order united in a crystal 2019-12-17T05:00:00Z The full debut of Dirac Bass is set for CES 2019 in Las Vegas next month, though it might be a while before we learn of devices that support it. Dirac Bass will trick you into perceiving deeper bass from your phone’s speakers 2018-12-18T05:00:00Z To understand what's happening to electrons at Dirac points, we need to observe them up close. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z Along with Schrödinger, several others – such as Paul Dirac, Eugene Wigner, and Max Born – were also contemplating the physical meaning of the wavefunction. Why everyone can — and should — learn quantum mechanics 2018-11-18T05:00:00Z Soon, researchers including Paul Dirac explained away the conceptual difficulties. The forgotten quantum pioneer who turned wartime spy 2018-11-01T04:00:00Z The cosmologist spent 30 years as the Lucasian professor of mathematics at Cambridge University, a post held by giants such as Isaac Newton, Charles Babbage and Paul Dirac. New £50 note: Bank of England asks public to nominate scientist 2018-11-02T04:00:00Z Dirac says that Dirac Bass will work exclusively in conjunction with Dirac Panorama Sound or Dirac Power Sound on supported devices, so you’ll basically be looking for a device that’s fully outfitted with Dirac technologies. Dirac Bass will trick you into perceiving deeper bass from your phone’s speakers 2018-12-18T05:00:00Z Like real graphene, our artificial crystal has Dirac points in its band structure. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z Paul Dirac wrote: “The research worker, in his efforts to express the fundamental laws of Nature in mathematical form, should strive mainly for mathematical beauty.” Beauty Does Not Equal Truth, in Physics or Elsewhere 2018-10-28T04:00:00Z Early recipients included Marie and Pierre Curie, Paul Dirac and Albert Einstein, who worked at a time when individual scientists could make breakthroughs in quantum physics and relativity. Why Nobel prizes fail 21st-century science 2018-09-30T04:00:00Z He compares this with the notion introduced by British physicist Paul Dirac in the 1920s who argued particles possess antiparticles, and if brought together, a particle and antiparticle can annihilate each other. Quantum Physics May Be Even Spookier Than You Think 2018-05-21T04:00:00Z Observation of Dirac cone band dispersions in FeSe thin films by photoemission spectroscopy. Massive Dirac fermions in a ferromagnetic kagome metal 2018-03-18T04:00:00Z To move our BEC on this graph toward the Dirac point, we need to change its momentum—in other words, we must actually move it in physical space. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z Well-prepared, single layers of graphene are highly ordered systems whose electronic properties are determined by a subtle symmetry, which is encoded in a solid-state version of the Dirac equation describing low-energy excitations. Novel electronic states seen in graphene 2018-03-04T05:00:00Z And Dirac says there is no facility it is aware of for offering brachytherapy - that's when the radiation is administered through an implant, which is better at treating conditions such as cervical cancer. Reality Check: More radiotherapy for dogs than people? 2017-10-12T04:00:00Z Picking up on a profound but under-developed idea by theoretician Paul Dirac, he found a way of reformulating quantum mechanics in terms of a 'sum over paths' between points in space-time. Theoretical physics: When the doer met the dreamer : Nature : Nature Research 2017-10-03T04:00:00Z Theoretical prediction of a strongly correlated Dirac metal. Massive Dirac fermions in a ferromagnetic kagome metal 2018-03-18T04:00:00Z To put the BEC at the Dirac point, we need to give it the precise momentum values corresponding to that point on the plot. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z Sea legs achieved, you're ready for wilder shores, such as the Dirac–Milne universe. Books in brief : Nature : Nature Research 2017-09-26T04:00:00Z Dirac says a fourth machine is under construction in Abuja, and this will be a linear accelerator. Reality Check: More radiotherapy for dogs than people? 2017-10-12T04:00:00Z The acronym is also a nod to Paul Dirac, the English theoretical physicist who predicted the existence of antimatter. By teaching computers to track asteroids, UW scientists may save the Earth 2017-06-29T04:00:00Z Physicist Michael Walker's foray into 'quantum weirdness' is firmly grounded in physics history — notably the 1927 Solvay Conference in Brussels, at which Paul Dirac, Niels Bohr and others fomented a revolution. Books in brief : Nature : Nature Research 2017-02-14T05:00:00Z Our experiment was the first to move a BEC through a Dirac point and then turn it at different angles. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z The actual speaker is the product of Meizu's partnership with Dirac. Meizu's Gravity wireless speaker channels Buddhist zen 2016-05-16T04:00:00Z While Dirac was clearly a genius, Feynman was truly transcendent. The Problem With Robots Isn't The Robots, It's Us 2014-04-26T10:36:00Z Graham Farmelo is the award-winning author of the Dirac biography The Strangest Man. The First Nuclear Arms Race: Churchill's Bomb [Part 2] 2014-04-25T00:01:00Z In the early days of quantum mechanics, Paul Dirac had come up with an equation that made the Schrödinger equation compatible with special relativity. Schrodinger’s Rats and The Search for Ultimate Reality [Excerpt] 2014-01-31T15:00:00Z This shows that the Dirac point is a singularity—a place where physics is uncertain. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z Using direct imaging, they detected a distinct signature of the Dirac monopole - known as a "". Magnetic poles can 'split in two' 2014-01-30T02:23:31Z When Feynman was a young scientist, Eugene Wigner compared him to Paul Dirac, a giant at the time renown for his autistic qualities, saying that “he’s a second Dirac, only human this time.” The Problem With Robots Isn't The Robots, It's Us 2014-04-26T10:36:00Z Möttönen, who is a co-author on the latest paper, says that the monopole in the new study is closest to the real deal because the structure is identical to that of a Dirac magnetic monopole. Quantum Cloud Simulates Magnetic Monopole 2014-01-29T22:00:00Z But a new problem arose when Dirac realized that, if excited, the negative energy states could transform into positive energy states, leaving an empty hole in the negative energy sea. Schrodinger’s Rats and The Search for Ultimate Reality [Excerpt] 2014-01-31T15:00:00Z If we moved the BEC faster as it traveled near, but not through, the Dirac point, the point would cause a rotation of the BEC's quantum state that made the point seem larger. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z "This creation of a Dirac monopole is a beautiful demonstration of quantum simulation," said Lindsay LeBlanc, of the University of Alberta, a physicist not involved in the study. Magnetic poles can 'split in two' 2014-01-30T02:23:31Z Four years ago, I was able to get the Dirac equation in the Bohm theory. The Wholeness of Quantum Reality: An Interview with Physicist Basil Hiley 2013-11-05T00:15:15.043Z However it took both Maxwell and P.A.M Dirac to put all of that into mathematical perspective. The Story of Energy: The Physics of an Atom Part 1 2013-07-19T15:15:16.940Z To save his equation, Dirac imagined that the quantum vacuum was a sea in which every possible negative energy state was already filled, leaving only positive energy states accessible to electrons. Schrodinger’s Rats and The Search for Ultimate Reality [Excerpt] 2014-01-31T15:00:00Z The more slowly we moved the BEC, the smaller the Dirac point seemed. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z But ultimately, Dirac hit on the truth: Positrons are just the flip side of electrons. Where Are the Anti-People? [Excerpt] 2013-07-12T16:15:05.140Z When the researchers squeezed the lattice in one direction, they found that the microwaves were trapped unexpectedly along the edges of the structure, which challenges current theoretical descriptions of Dirac materials. Graphene knock-offs probe ultrafast electronics 2013-05-22T17:20:33.747Z Born in Newcastle upon Tyne, Higgs was inspired at school by the work of physicist Paul Dirac, who helped lay the foundations of quantum mechanics and predicted the existence of antimatter. Honour for Higgs boson physicist 2012-12-29T00:00:13Z What Dirac had considered a positively charged hole physicists nowadays think of as a positron—an object in its own right, not merely a hole. Schrodinger’s Rats and The Search for Ultimate Reality [Excerpt] 2014-01-31T15:00:00Z A great deal of persistent effort carried us through and eventually led to our measuring a phenomenon even more exciting than a Dirac point: another kind of singularity. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z Heisenberg was awarded the Nobel Prize for Physics in 1932 for helping establish the field of quantum mechanics; the following year, Dirac shared the prize with Erwin Schrödinger for their work in the field. A Few Words From Heisenberg 2012-09-06T14:00:20Z That prompted the precious Dirac points to merge and annihilate. Graphene knock-offs probe ultrafast electronics 2013-05-22T17:20:33.747Z Watch as the rascally professor solves the Dirac Equation. Richard Feynman, the late physicist, is hero of new graphic novel 2011-09-30T22:54:21Z With his holes, Dirac had predicted the existence of antiparticles. Schrodinger’s Rats and The Search for Ultimate Reality [Excerpt] 2014-01-31T15:00:00Z Before we embarked on our experiment, a related project with artificial crystals in Germany showed what happens when a BEC moves in a circular path around a Dirac point. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z Max and Geo are not like the three men who helped steer the quantum mechanics revolution: Wolfgang Pauli, Werner Heisenberg, and Paul Dirac. The Ordinary Geniuses Behind Genomics and Big Bang Cosmology 2011-08-26T20:15:00.263Z Instead, Dirac interpreted it as antimatter—and, four years later, it turned up in a real experiment. Fundamental physics: Antimatter of fact 2011-06-09T11:07:17Z It's the Dirac equation -- the two terms on the left are roughly the velocity of the electron and its inertia -- coupled to electromagnetism and gravity, the two terms on the right. Physics and the Immortality of the Soul 2011-05-23T18:15:00.240Z Thus, said Dirac, the large ratio of electric to gravitational forces is characteristic of the present age of the universe. Gravity, by George Gamow [Special Archive Article] 2011-03-04T13:45:00.433Z While going through these transformations, the BEC never touched the Dirac point. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z Pauli, Heisenberg, Dirac, and of course Einstein were extraordinary geniuses, whereas Max and Geo were only ordinary geniuses, smarter and more imaginative than you and me, but not qualitatively different from us. The Ordinary Geniuses Behind Genomics and Big Bang Cosmology 2011-08-26T20:15:00.263Z Graham Farmelo is the author of “The Strangest Man,” a biography of Paul Dirac. Book Review - Quantum - By Manjit Kumar 2010-06-11T18:33:00Z The planets of Sol were first reached by ships using Dirac pushers. The Aliens When Dirac put forward the idea, the solar system was thought to be about three billion years old. Gravity, by George Gamow [Special Archive Article] 2011-03-04T13:45:00.433Z By measuring the rotation of the BEC's quantum state as we turned it away from the Dirac point at different angles, we reproduced the earlier findings. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z This winding number also reveals that every time it goes around the Dirac point, its geometric phase increases by π. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z A pair of neutrinos would furnish a spin of two, the value calculated for the graviton by Dirac. Gravity, by George Gamow [Special Archive Article] 2011-03-04T13:45:00.433Z Some 20 years ago Dirac made an interesting proposal. Gravity, by George Gamow [Special Archive Article] 2011-03-04T13:45:00.433Z This question, which is as old as the quantum theory, was finally answered two years ago by the British physicist P. A. M. Dirac. Gravity, by George Gamow [Special Archive Article] 2011-03-04T13:45:00.433Z We discovered that the BEC's quantum state “wraps” around the Dirac point exactly once. Physicists Make Matter out of Light to Find Quantum Singularities 2023-06-18T04:00:00Z |
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