Propagation of Radiation from a Finite Incoherent Source in a Random Medium

1972 ◽  
Vol 19 (8) ◽  
pp. 701-707 ◽  
Author(s):  
Mark J. Beran ◽  
Alan M. Whitman
Keyword(s):  
Random Medium ◽  
Incoherent Source

Packed-Cage RBC with Combined Cultivation of Suspended and Fixed-Film Biomass

1990 ◽  
Vol 22 (1-2) ◽  
pp. 101-111 ◽  
Author(s):  
J. Wanner ◽  
M. Sýkora ◽  
M. Kos ◽  
J. Miklenda ◽  
P. Grau
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Random Medium ◽  
Treatment Plant ◽  
Mixing Effect ◽  
Scale Unit ◽  
Fixed Film ◽  
Rotating Biological Contactors ◽  
Bod Removal

The situation in the treatment of wastewaters from small sources in Czechoslovakia has been discussed and two types of manufactured rotating biological contactors have been described. The evaluation of RBCs' operation showed the main disadvantages of the contactors with conventional discs, viz. the low 0C and low mixing effect. In a newly designed RBC, the discs or packets of discs were replaced by a cage packed with a random medium. The cage was equipped with tubular aeration and mixing elements. The long-term tests with a pilot-plant and a full-scale unit using synthetic as well as municipal wastewaters proved the ability of the packed-cage RBC to achieve a low effluent BOD with such organic loadings when the effluent from the conventional RBCs already deteriorated. Besides the BOD removal the 0C of the packed-cage RBCs was tested to verify the possibility of the combined cultivation of suspended and fixed-film biomass. On the basis of results presented here, a new package wastewater treatment plant for about 500 PE will be designed.

Ca2+ spiral waves in a spatially discrete and random medium

2009 ◽  
Vol 38 (8) ◽  
pp. 1061-1068 ◽  
Author(s):  
Jun Tang ◽  
Lijian Yang ◽  
Jun Ma ◽  
Ya Jia
Keyword(s):  
Random Medium ◽  
Spiral Waves

scholarly journals A Correction of Random Medium Motion Correlation Imaging Method

2020 ◽  
Vol 174 ◽  
pp. 631-637
Author(s):  
Xue-Dong Liu ◽  
Tian Shi ◽  
Liang-Sheng Li ◽  
Ning Zheng
Keyword(s):  
Random Medium ◽  
Imaging Method

Limitation on image resolution imposed by a random medium

1978 ◽  
Vol 17 (3) ◽  
pp. 348 ◽  
Author(s):  
Akira Ishimaru
Keyword(s):  
Random Medium ◽  
Image Resolution

scholarly journals A STUDY OF DISORDERED SYSTEMS WITH GAIN: STOCHASTIC AMPLIFICATION

2000 ◽  
Vol 14 (16) ◽  
pp. 1669-1681 ◽  
Author(s):  
SANDEEP K. JOSHI ◽  
A. M. JAYANNAVAR
Keyword(s):  
Reflection Coefficient ◽  
Disordered Systems ◽  
Random Phase Approximation ◽  
Random Medium ◽  
Random Phase ◽  
Localization Length ◽  
Critical Length ◽  
Sample Length ◽  
Coherent Amplification ◽  
Transmission And Reflection

A study of statistics of transmission and reflection from a random medium with stochastic amplification as opposed to coherent amplification is presented. It is found that the transmission coefficient t, for sample length L less than the critical length L c grows exponentially with L. In the limit L→∞ transmission decays exponentially as < ln t>=-L/ξ where ξ is the localization length. In this limit reflection coefficient r saturates to a fixed value which shows a monotonic increase as a function of strength of amplification α. The stationary distribution of super-reflection coefficient agrees well with the analytical results obtained within the random phase approximation (RPA). Our model also exhibits the well known duality between absorption and amplification. We emphasize the major differences between coherent amplification and stochastic amplification where-ever appropriate.

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