Comparison of soil to plant transfer of uranium, radium and 210Po to wheat using three cultivation methods: hydroponics, plantlet and pot cultures

2021 ◽  
Author(s):  
Juan Gabriel Muñoz-Muñoz ◽  
Javier Guillén ◽  
Alejandro Salas
Keyword(s):  
Plant Transfer ◽  
Cultivation Methods

Cattle keeping, fertilization and water quality - a pilot study

1994 ◽  
Vol 30 (9) ◽  
pp. 249-253
Author(s):  
Pascal Maret
Keyword(s):  
Water Management ◽  
Water Quality ◽  
Surface Water ◽  
Pilot Study ◽  
Global Approach ◽  
The West ◽  
Breeding Management ◽  
Significant Damage ◽  
Cultivation Methods ◽  
Cattle Husbandry

Significant damage to surface water is caused by cattle husbandry. Only one global approach of water management and farming techniques (breeding management and cultivation methods) will ensure significant results. A pilot study run in the west of France proved that water quality can easily be improved by renovating the cattle buildings. It also showed that manure used as a fertilizer covers cultivation needs, which allows substantial savings for the farmers.

Complementary Sensitivity Design of PID Controllers for Arbitrary-Order Transfer Functions With Time Delay

2008 ◽  
Author(s):  
Tooran Emami ◽  
John M. Watkins
Keyword(s):  
Time Delay ◽  
Transfer Functions ◽  
Linear Time ◽  
Order System ◽  
Pid Controllers ◽  
Single Input Single Output ◽  
Linear Time Invariant ◽  
Single Output ◽  
Plant Transfer ◽  
Time Invariant

A graphical technique for finding all proportional integral derivative (PID) controllers that stabilize a given single-input-single-output (SISO) linear time-invariant (LTI) system of any order system with time delay has been solved. In this paper a method is introduced that finds all PID controllers that also satisfy an H∞ complementary sensitivity constraint. This problem can be solved by finding all PID controllers that simultaneously stabilize the closed-loop characteristic polynomial and satisfy constraints defined by a set of related complex polynomials. A key advantage of this procedure is the fact that it does not require the plant transfer function, only its frequency response.

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