| 单词 | electron beam |
| 例句 | He published prolifically; his areas of interest, which included the propagation of electron beams and their usefulness as ionization agents, were among the most intriguing in physics; and his resourceful laboratory technique was widely praised. Big Science 2015-07-07T00:00:00Z The researchers say the next step is to introduce new factors like changing the electron beam conditions or changing the temperature of crystal to find a way to improve or speed up the process. Surprising discovery shows electron beam radiation can repair nanostructures 2023-10-12T04:00:00Z The researchers used a technique based on a well-explored phenomenon arising from the bombardment of a solid with an electron beam. Ionic crystal generates molecular ions upon positron irradiation, finds new study 2023-10-10T04:00:00Z The injector being assembled at Sandia is a linear induction accelerator that will generate a high-energy electron beam to collide with a metal target generating X-rays that penetrate test objects. U.S. moves closer to underground testing of nuclear weapons stockpile without any actual explosions 2023-10-05T04:00:00Z Once they find a GNR, they use the electron beam in the STM to trigger metal deposition from hafnium diboride precursor molecules to create the wires. Making contact: Researchers wire up individual graphene nanoribbons 2023-09-20T04:00:00Z To capture the protons in this excited state and explore their 3D resonances, the team sent a high-energy electron beam into a chamber of cooled hydrogen gas. Music of the spheres: Scientists uncover ancient particle hymn from the birth of the universe 2023-09-01T04:00:00Z In a surprising new study, researchers at the University of Minnesota Twin Cities have found that the electron beam radiation that they previously thought degraded crystals can actually repair cracks in these nanostructures. Surprising discovery shows electron beam radiation can repair nanostructures 2023-10-12T04:00:00Z In addition, the electron beam moves best in a vacuum, making it impossible to view living materials. Concepts of Biology 2013-04-25T00:00:00Z The circulating electron beam radiates x-rays, just as a wet washcloth twirled overhead flings droplets of water. A farewell to the x-ray–generating particle accelerator that was my father’s baby 2023-05-03T04:00:00Z This involves shooting an electron beam at a nucleus, which transfers energy to the quarks within the protons and neutrons inside, stimulating lambda production. Physicists See ‘Strange Matter’ Form inside Atomic Nuclei 2023-04-27T04:00:00Z With a lower energy electron beam, the team can use crystal diffractors and magnets to finely pattern the electrons into tightly packed bunches. Compact x-ray laser would shrink billion-dollar machines to the size of a room 2023-03-22T04:00:00Z "What we showed in this study is that when we took a crystal of titanium dioxide and irradiate it with an electron beam, the naturally occurring narrow cracks actually filled in and healed themselves." Surprising discovery shows electron beam radiation can repair nanostructures 2023-10-12T04:00:00Z In a transmission electron microscope, the electron beam is transmitted through the cell and provides details of a cell’s internal structures. Concepts of Biology 2013-04-25T00:00:00Z Compared with previous sources, the Argonne machine produced more-compact electron beams that generated far more intense x-rays. A farewell to the x-ray–generating particle accelerator that was my father’s baby 2023-05-03T04:00:00Z That experiment involves sending the electron beam directly into the laser pulse; for the electrons, it will be as if they were interacting with a zetawatt laser. University of Michigan’s new laser will be America’s most powerful: 3,000 times stronger than power 2022-09-15T04:00:00Z Calculate the power of the electron beam in this tube if it has a current of 15.0 mA. College Physics for AP Courses 2015-08-12T00:00:00Z In a transmission electron microscope, the electron beam penetrates the cell and provides details of a cell’s internal structures. Biology for AP Courses 2022-06-09T00:00:00Z Now, physicists say they’ve come up with a way to use electron beams in a plasma reactor to create far more oxygen, potentially in a smaller package. Plasma reactors could create oxygen on Mars 2022-08-15T04:00:00Z The first goal was to make the most compact electron beam possible, which would then radiate the brightest x-ray beams, says John Galayda, an accelerator physicist who worked on the APS. A farewell to the x-ray–generating particle accelerator that was my father’s baby 2023-05-03T04:00:00Z He and Fink generated the trapped hydrogen ion by using an electron beam to knock an electron out of a hydrogen molecule. Particle drag race leads to most precise estimate yet of the proton’s mass 2021-11-30T05:00:00Z Figure 30.7 This schematic shows the electron beam in a CRT passing through crossed electric and magnetic fields and causing phosphor to glow when striking the end of the tube. College Physics for AP Courses 2015-08-12T00:00:00Z Early versions only worked with visible light and x-rays, not the electron beams required to image atomic-size objects. See the Highest-Resolution Atomic Image Ever Captured 2021-06-28T04:00:00Z Yet, by firing an electron beam into the reaction chamber, they were able to convert about 30% of the air into oxygen. Plasma reactors could create oxygen on Mars 2022-08-15T04:00:00Z A tiny electron beam radiates a tiny x-ray beam, which can probe minuscule samples—provided it consistently hits the target. A farewell to the x-ray–generating particle accelerator that was my father’s baby 2023-05-03T04:00:00Z The names, along with 155 essays written by schoolchildren who were finalists in a “Name the Rover” contest, were stenciled by electron beam onto three fingernail-sized chips and attached to the spacecraft. Perseverance rover pays tribute to 2018 Camp fire victims 2021-02-19T05:00:00Z But a quadrupole that focuses the electron beam horizontally spreads it vertically and vice versa, so the beam expands and contracts like an accordion as it circulates. Rebirth of leading European facility promises revolutionary advances in x-ray science 2020-07-15T04:00:00Z One is X-ray crystallography, which involves growing tiny crystals of pure protein and revealing their internal structure by bombarding them with X-rays from a high-energy electron beam. The sprint to solve coronavirus protein structures — and disarm them with drugs 2020-05-14T04:00:00Z He especially likes how the electron beam could be tuned to split other atmospheric molecules, such as nitrogen, to create fertilizer. Plasma reactors could create oxygen on Mars 2022-08-15T04:00:00Z Unlike electron beams, which are produced with almost laser-like quality, muon beams are generated through a complicated process resulting in a beam that is more reminiscent of the spray of pellets from a shotgun. Muon colliders come a step closer 2020-02-04T05:00:00Z Researchers at Jefferson lab already do similar work by firing their electron beam at targets rich with protons and neutrons. Department of Energy picks New York over Virginia for site of new particle collider 2020-01-09T05:00:00Z The dipoles bend electrons slightly different amounts depending on their energies, causing the electron beam to spread. Rebirth of leading European facility promises revolutionary advances in x-ray science 2020-07-15T04:00:00Z Numerous electron beams scan a sample at the same time, which enables the microscope to capture hundreds of millions of pixels per second. How to map the brain 2019-07-23T04:00:00Z The electron beam passed through and interacted with these SPPs and with fields on the opposite side of the film. Holograms from electrons scattered by light 2019-07-02T04:00:00Z The crystals are rotated in the electron beam by tilting the microscope stage to create a series of diffraction patterns. Tiny crystals have big potential for determining structures of small molecules 2018-12-16T05:00:00Z But others are heartened by the latest research on the effect of electron beams. The microscope revolution that’s sweeping through materials science 2018-11-20T05:00:00Z Because the x-ray photons emerge from such a tiny electron beam, they should oscillate in unison like those in laser light, accentuating the wavelike nature of the x-ray beam. Rebirth of leading European facility promises revolutionary advances in x-ray science 2020-07-15T04:00:00Z One alternative is to replace X-rays with electron beams, which can produce diffraction patterns using much smaller crystals. 'Why didn’t we think to do this earlier?' Chemists thrilled by speedy atomic structures 2018-10-28T04:00:00Z When an electron beam passes through the film, it subsequently interacts with the fields on both sides, producing a spiral interference pattern. Holograms from electrons scattered by light 2019-07-02T04:00:00Z To reduce damage, MicroED uses a highly attenuated electron beam, and the crystals are frozen and imaged under cryogenic conditions. Tiny crystals have big potential for determining structures of small molecules 2018-12-16T05:00:00Z A silicon impurity is moved around inside a hexagonal graphene lattice using the focused electron beam of a scanning tunnelling electron microscope. The microscope revolution that’s sweeping through materials science 2018-11-20T05:00:00Z The new approach builds on a technique called electron diffraction, which sends an electron beam through a crystal and, as in x-ray crystallography, determines structure from diffraction patterns. ‘A new day for chemistry’: Molecular CT scan could dramatically speed drug discovery 2018-10-19T04:00:00Z At the moment, researchers tend to rely on electron microscopes to generate the electron beams, but these are expensive and include components, such as lenses, that are not necessary for electron diffraction. 'Why didn’t we think to do this earlier?' Chemists thrilled by speedy atomic structures 2018-10-28T04:00:00Z Specifically, some of the holograms in the present study arise from the quantum-mechanical interference of electron beams, rather than from the interference of crossed light waves. Holograms from electrons scattered by light 2019-07-02T04:00:00Z They focused an electron beam precisely at microcrystals of paracetamol in the medication, and then recorded and analysed the diffraction patterns to visualize the structure. Tiny crystals have big potential for determining structures of small molecules 2018-12-16T05:00:00Z While the LHC, the world’s most powerful accelerator, circulates protons in a ring, most accelerator labs in the world use electron beams, typically produced by linear accelerators. CERN’s pioneering mini-accelerator passes first test 2018-08-28T04:00:00Z So, his team varied the technique: Instead of firing their electron beam from one direction at a static crystal, they rotated the crystal and tracked how the diffraction pattern changed. ‘A new day for chemistry’: Molecular CT scan could dramatically speed drug discovery 2018-10-19T04:00:00Z For any given microscope lens, the best resolution is achieved by using the shortest possible wavelength of the radiation or electron beams concerned. A record-breaking microscope 2018-07-17T04:00:00Z It remains to be seen whether more-ambitious applications of the new findings will materialize, in which electron beams are used as part of quantum communication systems, or even in quantum computation. Holograms from electrons scattered by light 2019-07-02T04:00:00Z In MicroED, crystals are exposed to a focused electron beam in an electron microscope, rather than to X-rays. Tiny crystals have big potential for determining structures of small molecules 2018-12-16T05:00:00Z The team found that positron beams created as much light as did electron beams with hundreds of times more kinetic energy. Antimatter’s annihilation burns brightly 2018-04-15T04:00:00Z Electron microscopes once were thought to be useful only for examining nonliving material because the electron beam destroys biological material. Nobel Prize honors technique for seeing molecules’ details 2017-10-04T04:00:00Z The problem with freezing biological samples is that ice crystals diffract the electron beam, blurring the image. A cold, clear view of life wins chemistry Nobel 2017-10-04T04:00:00Z Following this, they fired an electron beam at the structure to obtain a diffraction pattern. Molecular Movie Reveals Inner Workings of New Solar Cells 2017-08-03T04:00:00Z The additive-manufacturing process uses lasers or electron beams to weld minute alloy particles that start as loose powder. Manufacturers Take a Page From Mother Nature 2016-11-29T05:00:00Z An electron beam as fine as an atom is scanned through the specimen to probe its structure3. Fire up the atom forge 2016-11-21T05:00:00Z In this arrangement the laser or electron beams would melt the tips of the wires. Having no truck with it 2016-11-02T04:00:00Z Arcam, founded in 1996 and based near the city of Gothenburg, invented an electron beam melting machine used in the aerospace and orthopedic implant industry. GE’s 3-D Printing Buys Set to Fail After Activist Elliott Intervenes 2016-10-21T04:00:00Z Related documents indicate the depleted uranium was received from Union Carbide in the form of pressed billets or ingots, then melted to remove impurities in an electron beam furnace designated S-6. Depleted uranium at Wah Chang led to decades of health woes 2016-06-21T04:00:00Z CryoEM users fire electron beams at a flash-frozen solution of proteins, collect thousands of images and combine these to reconstruct a 3D model of a protein with near-atomic resolution. The struggle with image glut 2016-04-27T04:00:00Z For example, the electron beam may scatter off new or missing atomic columns or be affected by symmetries and asymmetries in the surrounding crystal. Fire up the atom forge 2016-11-21T05:00:00Z They included exploiting bugs in Apple’s software, making copies of the phone to try cracking the passcode, and using electron beams or radio waves to try to obtain the encryption key from the phone’s chip. FBI may not need Apple to unlock San Bernardino shooter’s iPhone 2016-03-21T04:00:00Z Tests with electron beams show that the magnetic field in the still-empty reactor is the right shape. Feature: The bizarre reactor that might save nuclear fusion 2015-10-21T04:00:00Z It is one of the world’s most advanced cryo-electron microscopes: a device that uses electron beams to photograph frozen biological molecules and lay bare their molecular shapes. The revolution will not be crystallized: a new method sweeps through structural biology 2015-09-08T04:00:00Z "The brush is an electron beam; the canvas, an oscilloscope; the painter, an electronic computer." A look back at the first computer art contests from the '60s: bullet ricochets and sine curve portraits 2015-07-13T04:00:00Z Knowing more about how the electron beam interacts with matter is crucial for predicting how the fabrication system will behave. Fire up the atom forge 2016-11-21T05:00:00Z Metal or plastic powder is used as the base material which is melted and cut into layers by a moving laser or electron beam. 3D Printers Produce Bionic Ants for Future Factories 2015-03-27T04:00:00Z They used a laser, rather than an electron beam, to do the melting. Entering the jet age 2015-03-05T05:00:00Z He chipped off a gram piece and put it under an electron microprobe, which uses an electron beam to excite atoms in the rock’s minerals. Feature: A castaway from ancient Mars 2014-11-25T05:00:00Z Scientists there first sought to increase the intensity and brightness of the synchrotron’s X-ray light in 2006 by focusing electron beams more tightly. Ultimate upgrade for US synchrotron 2013-09-12T13:50:53.237Z To deliver a prescribed number of electrons to a specified location at a particular time demands full control over the position, velocity and power of the electron beam. Fire up the atom forge 2016-11-21T05:00:00Z Some use powdered plastic or powdered metal that is then fixed in place with a laser or an electron beam. 3D printing with paper: Print me the head of Alfredo Garcia 2013-08-08T15:00:00Z He sends his pieces of acrylic through the accelerator’s electron beam, which is designed to break chemical bonds in plastics. Fermilab Physicist Makes "Frozen Lightning" Art with Accelerators 2013-07-23T23:15:00.603Z But that process causes the emission of a small amount of X-ray radiation - with the exact energy of the X-rays corresponding to the chemical element present in the focus of the electron beam. Meteor's debris seen close up 2013-07-12T17:00:33Z An electron beam enters the vacuum chamber and melts the particles in a pattern as dictated by a CAD file. Getting 3-D Printing and Next-Generation Manufacturing to the Factory Floor [Video] 2013-04-22T11:15:00.353Z Just as in an old-fashioned cathode-ray-tube color television, the electron beam scans the sample to build up an image line by line. Electron Beams Set Nanostructures Aglow 2013-01-09T17:15:08.143Z Daedalus' fusion reactions would be sparked by electron beams rather than antiproton beams, however. Antimatter and Fusion Drives Could Power Future Spaceships 2012-09-13T15:45:00.407Z That upgrade, which will double the energy of the electron beams in the lab's particle accelerator, is roughly two thirds complete, says Robert McKeown, deputy director for science at Jefferson Lab. Nuclear Decelerator: Last U.S. Particle Collider on Chopping Block 2012-08-24T16:45:00.283Z The energy from the electron beam causes chemical reactions that damage the DNA of the microbes to the point that the microbes are unable to repair themselves, and so they die. Will Irradiated Burgers Turn You Radioactive? The Truth About Food Irradiation 2012-07-12T13:36:51Z The process routinely creates holes in the atom-thick sheets, so the researchers were trying to understand how those holes form, firing electron beams through graphene sheets and then studying the results with an electron microscope. Graphene holes 'heal themselves' 2012-07-11T11:15:45Z The electron beams at the Jefferson Lab are not the most powerful, but they are extremely intense. Physicists hunt for dark forces 2012-04-04T17:20:36.127Z Researchers are also investigating the use of graphene devices to steer electron beams in a way similar to what we do today in optics with light. Q&A: Taking charge 2012-03-14T22:50:48.640Z Technically known as “additive rapid manufacturing” devices, 3-D printers also use lasers or electron beams to selectively shape the source material into its final form. Part 8: Will You Soon Be Able To Make Amazon's Kindle At Home? 2011-09-15T14:27:34Z An electron beam would then scan each developed image before transmitting the photos back to Earth using radio signals—the same way television satellites would analog signals to TV stations. Like No Other View On Earth 2011-08-23T14:23:00Z These machines literally ‘print’ from computer images entire finished parts or simple products, ‘assembling’ from raw metal powders using powerful lasers or electron beams. Manufacturing, 3D Printing and What China Knows About the Emerging American Century 2011-07-05T16:53:36Z The main 6-gigaelectronvolt electron beam at Jefferson Lab has the right energy to probe the most likely mass range for a heavy photon. Physicists hunt for dark forces 2012-04-04T17:20:36.127Z Some 3D printers spread metal powders on the print table and sinter the pattern with lasers or electron beams, rather than using masks. Three-dimensional printing: An image of the future 2011-05-19T11:03:06Z Electron microscopes solve this problem by replacing the visible light with electron beams, which have a much shorter wavelength and a much smaller intrinsic blur. Scattering Microscope Peers Into the Nanoscale 2011-04-29T18:37:18Z He coated a piece of glass with aluminum, hit it with an electron beam, and made a series of holes small enough to hold one molecule each. Pacific Biosciences' $600 Million Decoder Ring 2011-04-28T21:00:00Z A: No radioactivity is left in irradiated foods because the energy used, from such sources as X-rays and electron beams, is too low. So far, risk low from radiation in food in Japan 2011-03-21T23:31:04Z Through additional chemical modification, the usefulness of the inks can be extended by making them sensitive to light or electron beams, where they behave like the chemicals in photographic film, Keszler says. Green Electronic Technology 2011-02-22T19:54:00Z Sterigenics provides sterilization services for the medical device and drug industries using ethylene oxide, gamma and electron beam processes. UPDATE 2-Silverfleet plans $800mln Sterigenics sale-sources 2010-09-02T19:18:00Z But in the recent paper, Thomas-Keprta, an expert in the use of electron beam technology to look inside rocks, reported that the purity of the magnetites made that explanation impossible. NASA team cites new evidence that meteorites from Mars contain ancient fossils 2010-05-04T04:00:00Z One with wide possibilities is a new welding process by using a high-powered electron beam gun, developed for the fabrication of spaceships and other space vehicles. The Practical Values of Space Exploration Report of the Committee on Science and Astronautics, U.S. House of Representatives, Eighty-Sixth Congress, Second Session So, the phosphor coating gets hit with a strong electron beam, full of high voltage energy, and the phosphor glows, just for a few milliseconds. Terminal Compromise: computer terrorism: when privacy and freedom are the victims: a novel There is an electron beam that writes to the surface of the screen, the phosphor coated one. Terminal Compromise: computer terrorism: when privacy and freedom are the victims: a novel |
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