Source time

Fig. 6. The stimulus perceived as color is made up of the spectral power (or, as here, energy) curve of a source times the spectral reflectance (or transmittance) curve of an object times the appropriate spectral response curves (one shown here) of the eye (3).

Figures Comparison of nuciear reactor and pulsed spaliation sources. For reactor sources (steady-state method), a narrow band of wavelengths is seiected with a monochromator crystal and the scattering angle (26,) Is varied to scan dspacings. Pulsed sources (time-of-flight method) use almost the entire avail-abie neutron spectrum, fix the scattering angie (26,), and simultaneousiy detect a neutron while determining its time of flight.

Source time scale, length of time for contaminant to become... 

The source time scale fs describes the length of time for the contaminant to become airborne the source time scale is also limited by the inventory of contaminant. 

The source time scale t, must be greater than the travel time t, for a steady-state plume to be possible. Other time scale restrictions are considered for the models discussed here. 

Passive puff or plume In addition to the restriction on plumes discussed above, there is an along-wind dispersion time scale given by td = 2Gjur where Gx is evaluated at the endpoint distance xe. The release can usually be considered a plume if ts > 2.5 fd, where ts is the source time scale defined above, and the release can be considered a puff if td > ts. For td< ts< 2.5 td, neither puff nor plume models are entirely appropriate the predicted concentration is considered the largest of the puff and plume predictions. 

R. P. Fisher and J. D. Winefordner, Pulsed source-time resonance phosphorimetry, Anal. Chem. 44, 948-956 (1972). 

Mass spectrum from Y. Su, Y. Duan, and Z. Jin, Helium Plasma Source Time-of-Flight Mass Spectrometry Off-Cone Sampling tor Elemental Analysis, Anal. Chem. 2000, 72, 2455. 

Tissue Dose, Source (time) Metabolites (C found) Reference... 

Tissue specimens ideally should be placed in the fixative immediately after their removal from the body. This problem arises in studies of human tissues, for their immediate fixation is usually not feasible. If immediate fixation is not possible, the tissue must be kept cool and moist by covering it with a piece of cloth soaked in sterile, cold saline for not more than 20-30 min. During this time the specimen should not contact any dry and absorbent object such as paper, a paper towel, or gauze. To keep the paper trail of the specimen (source, time, place of collection, etc.) is no less important. 

Photoluminescence is the radiation emitted by the recombination process and as such is a direct measure of the radiative transition. Information about non-radiative recombination can often be inferred from the luminescence intensity, which is reduced by the competing processes (Street 1981a). The most useful feature of the luminescence experiment is the ability to measure the emission spectrum to obtain information about the energy levels of the recombination centers. The transition rates are found by measuring the transient response of the luminescence intensity using a pulsed excitation source. Time resolution to about 10 s is relatively easy to obtain and is about the maximum radiative recombination rate. The actual recombination times of a-Si H extend over a wide range, from 10 s up to at least 10- s. 

THERdbASE contains two major modules, namely a Database Module and a Model Base Module. The Database Module relates information from exposure, dose and risk-related data files, and contains information about the following population distributions, location/activity patterns, food-consumption patterns, agent properties, agent sources (use patterns), environmental agent concentrations, food contamination, physiological parameters, risk parameters and miscellaneous data files. The Model Base Module provides access to exposure dose and risk-related models. The specific models included with the software are as follows Model 101, subsetting activity pattern data Model 102, location patterns (simulated) Model 103, source (time application) Model 104, source (instantaneous application) Model 105, indoor air (two zones) Model 106, indoor air (n zones) Model 107, inhalation exposure (BEAM) Model 108, inhalation exposure (multiple chemicals) Model 109, dermal dose (film thickness) Model 110, dose scenario (inhalation/dermal) Model 201, soil exposure (dose assessment). 

If a film is heated by the continuous-operated or oscillated lasers, temperature overshoot takes place in ftie films of smaller values of CoX /a within a very short period of time. The effect of ftie laser heat source on ftie temperature distribution in the film becomes larger in the thin film. In other words, if ftie absorption coefficient, b, of the laser increases, ftie temperature is more dependent on the laser heat source in a ftiin film thMi in a ftiick film. Overshoot and oscillation of thermal wave depend on the frequency (o of the heat source time characteristics. 

The pulsed-source (time-resolved) method, then effects spectroscopic separation of the emission of several fluorescing species by taking advantage of differences in their decay times rather than their fluorescence intensities. This means that several overlapping fluorescences, such as those of free and antibody-bound ligand can be quantified simultaneously. Lanthanide chelate-labeled antibodies, which have long lifetimes (in the 1 = ms to 1 = ps range) form the basis of a time-resolved FIA, for which instrumentation is commercially available. 

Source Time Series Data, Office of National Statistics... 

Glenn Ullyot (to Dr. Kupchan) The logistics of supply of adequate quantities of plant material is a major factor in seeking drugs from plant sources. Time delays, expense of collecting, and problems of identification must be faced. What has been your experience with these practical considerations ... 

Maintain contact with suppliers Manage engineers Develop workplan Sourcing timing plan Conduct design reviews Development, DVP R incremental facUities and funding identified ... 

Safety considerations are based on the magnitude of the half-life, shielding, distance from the radioactive source, time of exposure, and type of radiation emitted. We are never entirely free of the effects of radioactivity. Background radiation is normal radiation attributable to our surroundings. 

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