At the Jülich Institute of Neurosciences and Biophysics, the world's largest PET / MRI device began operation in April 2009: a 9. 4-tesla magnetic resonance tomograph ( MRT ) combined with a positron emission tomograph ( PET ).

At frequencies offset from the strength of stimulated ( or spontaneous ) emission will be decreased according to the so-called " line shape ".

At certain values of plate voltage and current, the tetrode characteristic curves are kinked due to secondary emission.

At the beginning of the 11th Century, the Arabic scientist Alhazen wrote the first comprehensive treatise on optics ; describing refraction, reflection, and the operation of a pinhole lens via rays of light traveling from the point of emission to the eye.

At the quark level, W < sup >−</ sup > emission turns a down-type quark into an up-type quark, turning a neutron ( one up quark and two down quarks ) into a proton ( two up quarks and one down quark ).

At high latitudes ( near the Earth's poles ), they are very low, making communication difficult or impossible due to factors such as atmospheric refraction, Earth's thermal emission, line-of-sight obstructions, and signal reflections from the ground or nearby structures.

At certain values of plate voltage and current, the tetrode characteristic curves are kinked due to secondary emission

At this point, the Q-switch device is quickly changed from low to high Q, allowing feedback and the process of optical amplification by stimulated emission to begin.

At even higher fields, FN tunneling becomes the dominant electron emission mechanism, and the emitter operates in the so-called " cold field electron emission ( CFE )" regime.

At 2500 ° C, the emission is 3000 A / m < sup > 2 </ sup >.

At the time of writing, the most promising forms of large-area field emission source ( certainly in terms of achieved average emission current density ) seem to be Spindt arrays and the various forms of source based on CNTs.

At low current densities, krypton's spectral line output in the near-IR range is better matched to the absorption profile of neodymium based laser media than xenon emission, and very closely matches the narrow absorption profile of Nd: YAG.

At the same time, the emission or absorption of a W boson can change the type of the particle – for example changing a strange quark into an up quark.

At 295 nm, the tryptophan emission spectrum is dominant over the weaker tyrosine and phenylalanine fluorescence.

At that time, such minimal emission control regulations as existed in the U. S. were promulgated at the municipal or, occasionally, the state level.

At radio and X-ray wavelengths, the nucleus is a strong source of synchrotron emission.

At high concentration of excitations ( of order of 1 %) and poor cooling, the quenching of emission at laser frequency and avalanche broadband emission takes place.

At this point, Burnell notes of herself and Hewish that " we did not really believe that we had picked up signals from another civilization, but obviously the idea had crossed our minds and we had no proof that it was an entirely natural radio emission.

At V band, the emission from airglow is V = 22 per square arcsecond at a high-altitude observatory on a moonless night ; in excellent seeing conditions, the image of a star will be about 0. 7 arc-seconds across with an area of 0. 4 square arc-seconds, and so the emission from airglow over the area of the image corresponds to about V = 23.

At this point the characteristic atomic emission lines of the elements can be observed.

At exactly 7:30, he felt a fluttering object brush his face.

At the instant of any observation of an object, the apparent position of the object is displaced from its true position by an amount which depends solely upon the transverse component of the velocity of the observer, with respect to the vector of the incoming beam of light ( i. e., the line actually taken by the light on its path to the observer ).

At the same time, object databases attempt to introduce key ideas of object programming, such as encapsulation and polymorphism, into the world of databases.

At even faster velocities the object will follow a range of hyperbolic trajectories.

At some point, the married couple may become the object of a charivari, a good-natured hazing of the newly-married couple.

( At that time, nebula was the generic term for any visually extended or diffuse astronomical object, including galaxies beyond the Milky Way, until galaxies were confirmed as extragalactic systems by Edwin Hubble in 1924.

At the conclusion of the season, Buffy destroys an object, a seed, that is the source of the magic in the world, leaving Willow powerless.

At Meissen, Brandenburg, and Merseburg he succeeded in giving the papal measure due official publicity, but at Leipzig he was the object of the ridicule of the student body and was compelled to flee by night to Freiberg, where he was again prevented

At the climax, O appears as a slave, nude but for an owl-like mask, before a large party of guests who treat her solely as an object.

At the denotational level, the term refers to situations where a single entity can be seen to mean more than one mathematical object.

At 12: 07 a. m., a security camera at the high altitude W. L. Eccles Observatory ( 9600 ft above sea level ) recorded a movie of the passage of the object to the north.

At the Voyager 2 images Ophelia appears as an elongated object, the major axis pointing towards Uranus.

At the Voyager 2 images Bianca appears as an elongated object, the major axis pointing towards Uranus.

At the Voyager 2 images Cressida appears as an elongated object, the major axis pointing towards Uranus.

At the Voyager 2 images Desdemona appears as an elongated object, the major axis pointing towards Uranus.

At the Voyager 2 images Juliet appears as an elongated object, the major axis pointing towards Uranus.

At the age of 46, in 1536, she was back in Rome, where, besides winning the esteem of Cardinals Reginald Pole and Contarini, she became the object of a passionate friendship on the part of 61-year-old Michelangelo.

At the January 2, 2007 funeral of Gerald Ford, George H. W. Bush reminisced in his eulogy about how Ford took it in stride when SNL's Chevy Chase made Ford the object of impressions.

At one point, it was hoped that QPW and Paradox for Windows would be able to share a common object model.

At an Air Traffic Control center in Indianapolis, Indiana, a controller listens as two airline flights almost have a mid-air collision with an apparent unidentified flying object ( UFO ).

At the start of a new scene, the z-buffer must be cleared to a defined value, usually 1. 0, because this value is the upper limit ( on a scale of 0 to 1 ) of depth, meaning that no object is present at this point through the viewing frustum.

At a stadium or arena, sports fans will voice their pleasure with a particular incident, player, or team by cheering, which consists of clapping, fist-pumping, or shouting positive exclamations toward the field of play and ultimately, the favorable object.