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Resolution degradation

Concentration effects on the quality of steroid spectra have been described by Wehrli (27, 28) who noted a resolution degradation in solutions of increasing concentration of cholestan-3-one. The effect is one of line broadening and peak height loss. The methylene carbons are first affected, followed by those of the methine groups. [Pg.208]

GC resolution degrades slightly in all of the available GC/FTIR interfaces. In the light-pipe type interface, some broadening of the chromatographic peaks occur because the diameter of the light-pipe... [Pg.360]

For a given monochromator the resolution degrades as the cotangent of the Bragg angle, 0. Some improvement to the resolution can be imposed by reducing the beam-line collimation but the sacrifice in neutron flux is usually unacceptable. [Pg.94]

EELS and detector aperture function For analysis by electron energy loss, however, the situation is rather different. Here, the detector is usually limited by a collector aperture in order to reduce energy resolution degradation. This has two effects firstly, only beams spread by an amount t are collected, where fc is the solid angle subtended by the collector aperture. Thus an estimate of A, the resolution obtainable by EELS, is... [Pg.61]

Pulse-shaped corrections to the pulse heights to correct for energy resolution degradation due to hole trapping (e.g., Finger et al. 1984). [Pg.133]

The spatial resolution degrades to 12 to 18 mm for body imaging because the detectors can not be positioned as close. The components of SPECT spatial resolution and their relative importance can be identified from the equation shown below ... [Pg.723]

There is some resolution degradation due to interaction of the incident electron beam with gas molecul,es in the specimen chamber. The magnitude of the degradation is a function of the chamber vacuum level, the energy of the incident electrons, and the working distance at which the specimen is examined. Resolution of a few tens of nanometers is, however, readily obtained. [Pg.572]

When seeking to eliminate EMI as a source of resolution degradation you might consider the following ... [Pg.247]

Typical system spatial resolution and geometric sensitivity for pin-hole collimator apertures of 0.5 and 1 mm are plotted in Fig. 2.1(a). These calculations assumed an intrinsic spatial resolution of 1 mm and an aperture angle of 60°. As can be seen, the dependence of camera sensitivity decreases as the square of the subject to collimator aperture distance. Optimum configuration is thus achieved by placing the subject very close to the collimator aperture. Moreover, spatial resolution degrades approximately linearly with subject to collimator distance. [Pg.44]

The depth resolution (depth resolution degrades with increasing energy)... [Pg.226]

For reasonable values of detector thicknc. ss, signal noise, and detection threshold, we observe that the intrinsic resolution degrades as the track crossc s at larger angle s of incidence. This is illustrated in Figure 2.4, which shows rc. solution as a function of angle for 50 and 100 /im pitch. [Pg.35]

Figure 2 A comparison of a series of 1D images as a function of the NMR line width with a constant gradient. The NMR line width is varied from 0.1% to 100% of the separation between the two bands in the image. As the resolution degrades so also does the sensitivity. Coherent averaging recovers both by artificially narrowing the NMR resonance. The solid state and coherent averaging line widths can differ by a factor of 10. ... Figure 2 A comparison of a series of 1D images as a function of the NMR line width with a constant gradient. The NMR line width is varied from 0.1% to 100% of the separation between the two bands in the image. As the resolution degrades so also does the sensitivity. Coherent averaging recovers both by artificially narrowing the NMR resonance. The solid state and coherent averaging line widths can differ by a factor of 10. ...

See other pages where Resolution degradation is mentioned: [Pg.1833]    [Pg.292]    [Pg.534]    [Pg.14]    [Pg.145]    [Pg.154]    [Pg.155]    [Pg.292]    [Pg.134]    [Pg.150]    [Pg.361]    [Pg.138]    [Pg.292]    [Pg.242]    [Pg.175]    [Pg.175]    [Pg.70]    [Pg.162]    [Pg.388]    [Pg.1833]    [Pg.124]    [Pg.326]    [Pg.337]    [Pg.307]    [Pg.98]    [Pg.760]    [Pg.1009]    [Pg.158]    [Pg.155]    [Pg.159]    [Pg.57]    [Pg.13]    [Pg.54]    [Pg.285]    [Pg.288]    [Pg.439]   
See also in sourсe #XX -- [ Pg.572 ]




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