Decreased attenuation

The results of Fig. 19.8 for a swirl number of 1.35 show that the attenuation increased to 10 dB with the velocity of the axial jet up to 42 m/s, and further increase to 47 m/s caused the amplitude to fall from around 6 kPa to less than 1.5 kPa and the attenuation to decrease from 10 dB to almost zero. Similar results were observed with the swirl number of 0.6 the attenuation improved with axial jet velocity up to 60 m/s, after which the amplitude and attenuation decreased. The decline in the amplitude of oscillation and its attenuation by active control was due to the interaction between the axial jet with a large velocity and the central recirculation zone, which caused the flame to move further downstream of the swirler and heat release to occur further from the pressure antinode. The consequent increase in the distance between the point of entry of the oscillated fuel and the active burning zone reduced the effectiveness of the oscillated input due to increased fluid dynamic damping and development of a large difference in phase between different parts of the oscillated flow, especially with swirl surrounding the oscillated axial jet. 

The attenuation decreases from the Natural Regime to Pump Regime II. This is consistent with (1), since the mean advective flow time rw is smallest for Pump Regime II. A short advective flow time increases the change of the oscillations to reach the well. 

Figure 20-21 Attenuated total reflectance sensor for Cu2+. Light traveling through the waveguide is attenuated (decreased) in the cation-exchange film in the presence of Cu2. [Data from T. Shtoyko, I. Zudans. C. J. Sellskar,...

Fig. 6. BEO does not affect decrease in p-PTEN immunoreactivity after stroke. Representative protein bands from western blots of p-PTEN showing reduction in p-PTEN immunoreactivity in brain cortical tissue samples obtained from rats sacrificed 24 h after MCAo. Intraperitoneal administration of BEO (0.5 ml/kg) 1 h before MCAo does not attenuate decrease in p-PTEN induced by stroke. The blots are representative of three animals per experimental group.

During the reaction, APM velocity increased while attenuation decreased. After an exposure time of 140 minutes, velocity and attenuation reached stable values, indicating the completion of the cross-linking reaction. 

If local containment is applied to the worst-case disturbance, the new worst-case disturbance can be assumed to be bounded by startup to maximum flow, giving Lcnet —. 01 M This disturbance may be in either the acid or the alkali direction, so 6c e, is reduced to. 00025 N. This corresponds to a required disturbance attenuation of. 025. The residence time has been doubled and the achievable attenuation decreases by a factor of 2" compared to the table above. The rigorous bound suggests that one tank might be just adequate (.017 versus. 025), while the heuristic estimate indicates that two tanks would be required. The two-tank system has an estimated attenuation of. 004 compared to a requirement of. 025 and should be able to deliver the required performance despite the titration curve variability. 

The attenuation (decrease) of neutron flux and fluence though the RPV wall results in a decrease in the embrittlement of the material and is... 

As a general rule, the attenuation decreases in shields of large volume or when there is wide opening and unusual configurations. The attenuation ratio is hence given by the following... 

The half-thickness for 2 MeV gamma rays in water is 5.4 inches. How much does the 20 feet of water above the core attenuate (decrease) the gamma radiation from the core Show your work. 

Attenuation decreases with increasing rock cementation and depth. Thus, as a general rule of thumb, velocity, and attenuation show an opposite behaviour with respect to their dependence on many factors of influence (for example porosity, pressure, consolidation). 

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