NUCLEUS Sample Clauses

NUCLEUS. Each syllable has a vocalic nucleus. In Tableau 1, the optimal candidate a. fulfills all constraints. This is because the information delivered by VI is sufficient to deliver the phonological content of the functional morpheme. Candidate b. has a voiced consonant and violates IDENT(F) and candidate c. violates ONSET and NOCODA. Since all constraints are fulfilled in the optimal candidate, it is not possible to establish a ranking among them. IDENT(F)root is not active here because the word has no lexical root.
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NUCLEUS. The central part of an atom consisting of protons and neutrons. nuclide A species of atom characterised by its atomic number and mass number, e.g. 8O, 11Na, 53I. Refers to all known nuclides, stable (279) and unstable (about 5000). parent nuclide A radionuclide that upon radioactive decay yields a specific daughter nuclide. periodic table An arrangement of chemical elements in order of increasing atomic number. Elements of similar properties are placed one under the other, yielding groups or families of elements. There is a general similarity of chemical behaviour within each group. personnel monitoring The measurement of radiation exposure of individuals using dosimeters or bioassay. photon A quantum (or packet) of energy emitted in the form of electromagnetic radiation. Its energy is equal to h , where h is Xxxxxx'x constant (6.626 x 10-34 J-s), and  is the frequency of the radiation (s-1). pico- A prefix that divides a basic unit by one trillion. pocket dosimeter A small radiation detection instrument that indicates radiation exposure directly. May use solid state semi-conductor detector, or gaseous GM or ionization chamber. positron A positively charged electron emitted by certain radionuclides. It is unstable, and in combination with an electron it undergoes annihilation to form annihilation radiation. proportional counter A radiation detection instrument with a gas-filled detector in which the pulse size is proportional to the incident energy. Can be used as a sensitive contamination monitor for large areas. protective barriers Walls and barriers of material such as lead, concrete, plaster, lead acrylic or lead glass. Used to reduce radiation exposure by shielding. proton An elementary nuclear particle with a positive electric charge located in the nucleus of an atom. (See atomic number) quality assurance A comprehensive set of actions or procedures to ensure that all aspects of a service will perform satisfactorily. quality control A set of tests routinely performed on a piece of equipment to confirm its satisfactory performance. rad The old unit of absorbed dose . 1 rad = 100 ergs per gram. 1 rad  10-2 Gy = 10 mGy. radiation trefoil An officially prescribed warning symbol (a magenta trefoil on a yellow background) that must be on or near radiation sources. radiation weighting factor A multiplying factor used to weight the absorbed dose from a given type of radiation to obtain the equivalent dose. Radiation weighting factors range from 1 for elec...
NUCLEUS. It has been extensively studied at all wavelengths. High resolution mid- infrared observations are presented in Xxxxxxxxxx et al. (1990), Xxxxxxxx et al. (2003) and Xxxxxx et al. (2003).. They show that ≤ 70 % of the total mid-infrared flux comes from a core component with a size of < 10 pc, while the rest originates in extended emis- sion from dust in the narrow line region. Observations with the Keck Interferometer have shown that the near-infrared emission of the nucleus is very compact (≤ 0.1 pc, Xxxxx et al. 2003). The result of the data on NGC 4151, obtained with MIDI in February 2007, is dis- played in Fig. 6.4 together with the Xxxxxxx spectrum. The total flux spectrum rises from ∼ 0.5 Jy at 8 µm to ∼ 1.3 Jy at 13 µm. Its general shape agrees with the shape of the Xxxxxxx spectrum, although it is lower by a factor of 30 to 50 %. None of the smaller scale variations can be trusted and the decreases of flux below 8.2 and around 9.7 µm are due to an insufficient removal during the calibration of the absorption caused by water and ozone in the Earth’s atmosphere especially for the high airmass at which this source was observed. The Xxxxxxx and the MIDI spectra are consistent with the flux being dis- tributed in an unresolved core and an extended component as described by Xxxxxxxx et al. (2003) when taking into account the difference in the apertures. The correlated flux spectrum is even lower, on a level between 0.1 and 0.3 Jy, implying that the mid- infrared source is clearly resolved. Assuming a visibility of V = Fcor/Ftot ∼ 20 % at λ ∼ 12 µm and for a baseline length of BL = 35.8 m, then a size on the order of 45 mas, that is ∼ 3 pc at the distance of NGC 4151, can be derived for the emission region. That the emission appears to be resolved on such scales shows that most of the mid- infrared emission is of thermal origin. The size derived here is significantly smaller than the 10 pc from Xxxxxxxxxx et al. (1990) but well above the estimated inner radius of the torus, xxxxxx = 0.04 pc (Xxxxxxxx et al. 2004). A full analysis of the MIDI data on this source will be given in Xxxxxxxxx et al. in preparation.
NUCLEUS. The nuclear activity might be triggered by the proximity to IC 4329, a giant elliptical galaxy. As one of the brightest X-ray sources, it has been mainly studied in this wavelength range.
NUCLEUS. Each syllable has a nucleus. In Tableau 1, the optimal candidate a. fulfils all constraints. Candidate b. violates ONSET and XXXXXX, candidate x. xxxxxxxx IDENT-OI(F) and candidate d. has a voiced consonant and violates IDENT-IO(F). Since all constraints are fulfilled in the optimal candidate, it is not possible to establish a ranking among them.

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