949 resultados para first and second branchial arches


Relevância:

100.00% 100.00%

Publicador:

Resumo:

Hearings held Nov. 27, 1973-Jan. 29, 1974

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Reuse of record except for individual research requires license from Congressional Information Service, Inc.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Hearings held Sept. 18-Nov. 3, 1969, in Washington, D.C.; Jan. 26, 1970, in Cherry Hill, N.J.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Pt.5: Hearings before the Public Health, Education, Welfare, and Safety Subcommittee.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

A change in curriculum permitted a direct and simultaneous comparison between first and second year responses to group project work while assuming similar prior experience with this method of learning. Responses were obtained by a survey form and by meetings with individual groups. Overall, there were no differences between first and second year responses, although analyses of gender responses suggested trends whereby males indicated they had developed greater creativity and felt they had contributed more to the group. The majority of students responded that group project work was a positive experience and a useful learning experience.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Motion is a powerful cue for figure-ground segregation, allowing the recognition of shapes even if the luminance and texture characteristics of the stimulus and background are matched. In order to investigate the neural processes underlying early stages of the cue-invariant processing of form, we compared the responses of neurons in the striate cortex (V1) of anaesthetized marmosets to two types of moving stimuli: bars defined by differences in luminance, and bars defined solely by the coherent motion of random patterns that matched the texture and temporal modulation of the background. A population of form-cue-invariant (FCI) neurons was identified, which demonstrated similar tuning to the length of contours defined by first- and second-order cues. FCI neurons were relatively common in the supragranular layers (where they corresponded to 28% of the recorded units), but were absent from layer 4. Most had complex receptive fields, which were significantly larger than those of other V1 neurons. The majority of FCI neurons demonstrated end-inhibition in response to long first- and second-order bars, and were strongly direction selective, Thus, even at the level of V1 there are cells whose variations in response level appear to be determined by the shape and motion of the entire second-order object, rather than by its parts (i.e. the individual textural components). These results are compatible with the existence of an output channel from V1 to the ventral stream of extrastriate areas, which already encodes the basic building blocks of the image in an invariant manner.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

We study the effects of temperature and strain on the spectra of the first and second-order diffraction attenuation bands of a single long-period grating (LPG) in step-index fibre. The primary and second-order attenuation bands had comparable strength with the second-order bands appearing in the visible and near-infra red parts of the spectrum. Using first and second-order diffraction to the eighth cladding mode a sensitivity matrix was obtained with limiting accuracy given by cross-sensitivity of ~1.19% of the measurement. The sensing scheme presented as a limiting temperature and strain resolution of ±0.7 °C and ~±25 µ.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

A method of discriminating between temperature and strain effects in fibre sensing using a conventionally written, in-fibre Bragg grating is presented. The technique uses wavelength information from the first and second diffraction orders of the grating element to determine the wavelength dependent strain and temperature coefficients, from which independent temperature and strain measurements can be made. The authors present results that validate this matrix inversion technique and quantify the strain and temperature errors which can arise for a given uncertainty in the measurement of the reflected wavelength.