Diurnal Changes in a Stream Ecosystem: An Energy and Nutrient Budget Approach

2000 ◽  
pp. 339-348
Author(s):  
Robert G. Wetzel ◽  
Gene E. Likens
Keyword(s):  
Nutrient Budget ◽  
Diurnal Changes ◽  
Stream Ecosystem

Water Relations of Field Grown Cotton and Sorghum: Temporal and Diurnal Changes in Leaf Water, Osmotic, and Turgor Potentials 1

Crop Science ◽  
1977 ◽  
Vol 17 (1) ◽  
pp. 76-80 ◽  
Author(s):  
R. C. Ackerson ◽  
D. R. Krieg ◽  
T. D. Miller ◽  
R. E. Zartman
Keyword(s):  
Water Relations ◽  
Leaf Water ◽  
Diurnal Changes

System Identification and Control of the Activated Sludge Process by Use of a Statistical Model

1989 ◽  
Vol 21 (10-11) ◽  
pp. 1161-1172 ◽  
Author(s):  
M. Hiraoka ◽  
K. Tsumura
Keyword(s):  
Control System ◽  
System Identification ◽  
Statistical Model ◽  
Activated Sludge ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Ar Model ◽  
Diurnal Changes ◽  
Activated Sludge Process ◽  
And Control

The authors have been developing a hierarchical control system for the activated sludge process which consists of an upper level system controlling long-term seasonal variations, a control system of intermediate level aiming at optimization of the process and a control system of lower level controlling diurnal changes or hourly fluctuations. The control system using the multi-variable statistical model is one of the most appropriate control systems based on the modern control theory, for applying the lower level control of the activated sludge process. This paper introduces our efforts for developing the reliable data acquisition system, the control experiments applying the AR-model, one of the statistical models which were conducted at a pilot plant and present studies on the system identification and control at a field sewage treatment plant.

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