| 单词 | maser |
| 例句 | But instead of ‘dots’, the pattern was made up by strange kind of ‘space torches’ called “masers”! Playing Connect-the-dots Around a Baby Star 2023-03-29T04:00:00Z The original devices were called masers, because they produced microwaves. College Physics for AP Courses 2015-08-12T00:00:00Z In the mid-1970s, a hydrogen maser, a device akin to a laser that produces a microwave radio signal at a particular wavelength, was carried by a rocket to an altitude of 10,000 kilometers. Astronomy 2016-10-13T00:00:00Z The word “maser” is an acronym for “microwave amplification by stimulated emission of radiation,” and this radiation is the radio analogue of an optical-light laser. A New Map of the Milky Way 2020-03-17T04:00:00Z Observations at the different sites were coordinated using atomic clocks, called hydrogen masers, accurate to within one second every 100 million years. Black hole picture captured for first time in space ‘breakthrough’ 2019-04-10T04:00:00Z This releases a burst of energy that heats up the disk as it moves outwards - and produces maser emissions on the way. Playing Connect-the-dots Around a Baby Star 2023-03-29T04:00:00Z In the late 1950s, Gould explored using light to optically ‘pump’ a maser — a device emitting microwaves at a specific frequency, invented by physicist Charles Townes in 1953. Dreaming of death rays: the search for laser weapons 2019-01-08T05:00:00Z Instruments on the ground were used to compare the frequency of the signal emitted by the rocket-borne maser with that from a similar maser on Earth. Astronomy 2016-10-13T00:00:00Z Invented in the 1950s, masers use microwaves instead of light, but they were somewhat eclipsed by the much more practical laser. Watch and listen: The science of 2018 in audio and video 2018-12-11T05:00:00Z For example, the public wasn't moved by the closely related maser. How lasers became synonymous with cool 2018-07-21T04:00:00Z By connecting the regions that fired a maser emission the researchers could map out the surface of the disk in G358-MM1. Playing Connect-the-dots Around a Baby Star 2023-03-29T04:00:00Z Before lasers, there were masers — the microwave siblings of optical lasers. Diamond device paves way for first practical microwave lasers 2018-03-20T04:00:00Z The experiment showed that the stronger gravitational field at Earth’s surface really did slow the flow of time relative to that measured by the maser in the rocket. Astronomy 2016-10-13T00:00:00Z More than half a century later, researchers are demonstrating a new kind of maser, made using diamond. Watch and listen: The science of 2018 in audio and video 2018-12-11T05:00:00Z J.D.B. conceived the study, developed the theory, designed the maser cavity, devised the experiment and wrote software for collecting experimental data. Continuous-wave room-temperature diamond maser 2018-03-20T04:00:00Z To help with the further investigation, astronomers will now start looking for other baby stars with masers around them - maybe they will find another spiral… or something entirely unexpected! Playing Connect-the-dots Around a Baby Star 2023-03-29T04:00:00Z That device also worked at room temperature, but it produced only maser pulses, rather than a continuous beam. Diamond device paves way for first practical microwave lasers 2018-03-20T04:00:00Z Dr. Bloembergen was also recognized for making important advances in the development of the maser, a device similar to the laser but that amplifies microwaves rather than light waves. Nicolaas Bloembergen, winner of Nobel Prize in physics, dies at 97 2017-09-09T04:00:00Z Each Galileo satellite carries two rubidium and two hydrogen maser clocks. Galileo satellites experiencing multiple clock failures - BBC News 2017-01-18T05:00:00Z For historical reasons, these are referred to as 'masers'. Continuous-wave room-temperature diamond maser 2018-03-20T04:00:00Z Scientists noted the presence of masers, intense radio sources that are observed almost exclusively in late-stage stars. Mysterious Milky Way Star: Very Old or Very Young? 2016-08-30T04:00:00Z Read the related News & Views article: ‘A diamond age of masers’ Diamond device paves way for first practical microwave lasers 2018-03-20T04:00:00Z Following his NMR work, Dr. Bloembergen devoted his attention to the amplification of microwave energy and the device for producing this effect, the maser. Nicolaas Bloembergen, winner of Nobel Prize in physics, dies at 97 2017-09-09T04:00:00Z The passive hydrogen maser clocks in Galileo are determined to be accurate to one billionth of a second per day, or one second in three million years. Galileo satellites experiencing multiple clock failures - BBC News 2017-01-18T05:00:00Z Despite being developed first, masers are not widely used as they usually require cryogenic refrigeration and high-vacuum systems. Continuous-wave room-temperature diamond maser 2018-03-20T04:00:00Z Charles Townes, the Nobel Prize–winning physicist credited with the invention of the laser and its predecessor — the maser — died in Oakland, Calif., on Tuesday. Morning Must Reads: January 29 2015-01-29T05:00:00Z Charles Townes, the Nobel Prize-winning physicist credited with the invention of the laser and its predecessor — the maser — died in Oakland, Calif., on Tuesday. Inventor of the Laser Dies 2015-01-29T05:00:00Z Instead, he went back to Columbia University, and began building a device he called a "maser," the acronym standing for "microwave amplification by stimulated emission of radiation." The Nobel prize-winning inventor of the laser dies at 99 2015-01-29T05:00:00Z He often said it was the combination of his physics background and his training in electrical engineering at Bell Labs that led to his historic work on the laser and its forerunner, the maser. Charles H. Townes, Nobel laureate and laser pioneer, dies at 99 2015-01-28T05:00:00Z The revelation led Townes and his students to build a device in 1954 they dubbed a maser, for microwave amplification by stimulated emission of radiation. Laser's co-inventor, Nobel laureate Charles Townes, dead at 99 2015-01-29T05:00:00Z He said he regarded his “revelation” on the park bench, when he conceived of the design for the maser, as a sign of the interplay between spiritual belief and scientific inquiry. Charles Townes, 99, dies; his laser helped transform society 2015-01-28T05:00:00Z Sitting in a park in Washington in 1951, pondering how to stimulate molecular energy to create shorter wavelengths, he conceived of a device he called a maser, for microwave amplification by stimulated emission of radiation. Charles H. Townes, Physicist Who Helped Develop Lasers, Dies at 99 2015-01-28T05:00:00Z Six years later, in 1957, Townes began to look into the creation of a new version of the maser, which used infrared light rather than microwaves. The Nobel prize-winning inventor of the laser dies at 99 2015-01-29T05:00:00Z In 1954, Dr. Townes and his students built a device that used energized ammonia molecules for the stimulated emission of microwave radiation, a device they called the maser. Charles H. Townes, Nobel laureate and laser pioneer, dies at 99 2015-01-28T05:00:00Z The laser and maser use an artificial form of spontaneous emission. And Let There Be "Molecules" of Light 2013-10-14T20:45:24.920Z In the 1940s it was radar, in the 1950s the maser and in the 1960s the laser. Charles Townes, 99, dies; his laser helped transform society 2015-01-28T05:00:00Z Calling himself a Protestant Christian, he argued that science and religion were compatible, saying there was little difference between a scientific epiphany, like his 1951 maser brainstorm, and the religious experience of revelation. Charles H. Townes, Physicist Who Helped Develop Lasers, Dies at 99 2015-01-28T05:00:00Z Townes first called the concept an "optical maser." The Nobel prize-winning inventor of the laser dies at 99 2015-01-29T05:00:00Z Thus, the concept of the optical maser — later dubbed the laser — was born. Charles H. Townes, Nobel laureate and laser pioneer, dies at 99 2015-01-28T05:00:00Z The maser and the laser both use stimulated radiation. And Let There Be "Molecules" of Light 2013-10-14T20:45:24.920Z He moved to Columbia University in 1948, where he conducted his fundamental work on the maser and laser. Charles Townes, 99, dies; his laser helped transform society 2015-01-28T05:00:00Z They called it an “optical maser,” a term that never caught on, and through Bell Laboratories they secured the first laser patent in 1959, a year before Dr. Maiman’s first working model. Charles H. Townes, Physicist Who Helped Develop Lasers, Dies at 99 2015-01-28T05:00:00Z In 1958, The Boston Globe reported that the maser was being adapted for military use by 20 universities and electronics firms. James Gordon Dies at 85; Work Paved Way for Laser 2013-07-28T01:51:30Z In 1960, Dr. Townes and Schawlow, both future Nobel laureates, became the first scientists to receive recognition for the optical maser when Bell Labs filed a patent. Charles H. Townes, Nobel laureate and laser pioneer, dies at 99 2015-01-28T05:00:00Z The latest device to fascinate the technical community is the optical maser, or, as it is now often called, the laser. 150 Years Ago: Sleep Technology 2013-07-14T13:15:00.480Z Undaunted, he and Schawlow successfully completed the first device in 1954, dubbing it a maser for “microwave amplification by stimulated emission of radiation.” Charles Townes, 99, dies; his laser helped transform society 2015-01-28T05:00:00Z He worked there with the Nobel Prize recipients Charles Hard Townes and Arthur L. Schawlow, who together invented the maser, which amplified microwaves the way lasers would soon amplify light. Tingye Li, Instrumental in the Laser’s Development, Dies at 81 2013-01-06T23:34:48Z The students on the team built the maser with their own hands and encountered endless practical problems. James Gordon Dies at 85; Work Paved Way for Laser 2013-07-28T01:51:30Z The transition rate from one Rydberg state to the other depends on the photon number in the cavity, and experimenters need only measure the fraction of atoms leaving the maser in each state. Cavity Quantum Electrodynamics 2012-10-09T20:45:02.517Z First conceived in the Soviet Union and the United States during the 1950s, early maser machines were the size of a chest of drawers. First Practical Maser (Microwave Laser) Is Built 2012-08-16T18:15:05.413Z The first maser - an acronym of microwave amplification by stimulated emission of radiation - was built in 1953, and later masers were used, for example, in the first transatlantic television broadcast. Cousin of laser is a hot prospect 2012-08-16T10:42:59Z His discoveries, which won him the Nobel prize, led to the caesium atomic clock and the hydrogen maser. Seven days: 4?10 November 2011 2011-11-15T17:20:24.403Z The maser is credited with inaugurating the field of quantum electronics, which uses a laser’s ability to shove around molecules and atoms in the development of electronic devices. James Gordon Dies at 85; Work Paved Way for Laser 2013-07-28T01:51:30Z A maser usually contains a very large number of atoms, collectively coupled to the radiation field in a large, resonating structure. Cavity Quantum Electrodynamics 2012-10-09T20:45:02.517Z Those masers work only when cooled to less than ten degrees above absolute zero, and even then they are not nearly as powerful as lasers. First Practical Maser (Microwave Laser) Is Built 2012-08-16T18:15:05.413Z However, the relative complexity of masers has relegated them to niche applications. Cousin of laser is a hot prospect 2012-08-16T10:42:59Z When the ensemble of cesium beam and hydrogen maser atomic clocks strike 11:11 today at Boulder’s National Institute of Standards and Time nothing will happen. Does 11/11/11 Have Anything to do With Science? 2011-11-11T18:45:00.230Z Though he worried that it would hurt his doctoral dissertation if the maser did not work, Dr. Gordon said yes. James Gordon Dies at 85; Work Paved Way for Laser 2013-07-28T01:51:30Z There is a striking similarity between the single atom-cavity system and a laser or a maser. Cavity Quantum Electrodynamics 2012-10-09T20:45:02.517Z Before there were lasers, there were microwave lasers, or masers. First Practical Maser (Microwave Laser) Is Built 2012-08-16T18:15:05.413Z The key value of masers lies not in their ability to produce a useful beam as lasers do, but to carry out the amplification process in a particularly clean way, without adding much noise. Cousin of laser is a hot prospect 2012-08-16T10:42:59Z In this manner, a self-sustaining microwave field builds up in the bulb—thus the name “maser.” Do You Use GPS? Say "Thanks" to Norman Ramsey (1915-2011) 2011-11-11T00:15:00.237Z One was that the vacuum chamber enclosing the maser sprang leaks. James Gordon Dies at 85; Work Paved Way for Laser 2013-07-28T01:51:30Z Although it would be difficult to measure such a tiny field directly, the atoms passing through the resonator provide a very simple, elegant way to monitor the maser. Cavity Quantum Electrodynamics 2012-10-09T20:45:02.517Z Atomic clocks like the hydrogen maser are also used in the ground-based timing systems that track global positioning satellites. Norman Ramsey Dies at 96; Work Led to the Atomic Clock 2011-11-07T03:54:38Z The development of optical masers is moving so rapidly that they should soon be ready for a wide variety of applications. 100 Years Ago: Science of the Unfit 2011-05-25T12:15:00.260Z The maser oscillation persists as long as the hydrogen is fed into the system. Do You Use GPS? Say "Thanks" to Norman Ramsey (1915-2011) 2011-11-11T00:15:00.237Z Water molecules in the disk act as natural masers — essentially, they're lasers that transmit in radio frequencies rather than visible light. Dark Energy: Astronomers Inch Toward Solving Space Riddle 2011-02-28T08:30:00Z "Don't try and buff me, dinAlt," the maser barrel pushed harder against his back. The Ethical Engineer Scientific and technical instruments—oscilloscopes, X-ray generators, radar equipment, maser sets, dynostatic crystals, thermolight resonators, and so on—were stolen complete or gutted for various parts. Anything You Can Do! These beams are much more monochromatic than those from other light sources; at their best optical masers rival the very finest electronic oscillators as a source of a single frequency. 100 Years Ago: Science of the Unfit 2011-05-25T12:15:00.260Z |
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