The role of nonminimum phase zeros in the transient response of multivariable systems

2011 ◽  
Author(s):  
Robert Schmid ◽  
Amit Pandey
Keyword(s):  
Transient Response ◽  
Multivariable Systems ◽  
Nonminimum Phase

Influence of storage on kinetic selection to control aerobic filamentous bulking

1996 ◽  
Vol 34 (5-6) ◽  
pp. 223-232 ◽  
Author(s):  
M. Majone ◽  
P. Massanisso ◽  
A. Carucci ◽  
K. Lindrea ◽  
V. Tandoi
Keyword(s):  
Transient Response ◽  
Storage Capacity ◽  
Fast Response ◽  
Mixed Cultures ◽  
Experimental Conditions ◽  
Intermittent Feeding ◽  
Substrate Removal ◽  
Batch Tests ◽  
The Difference

In various activated sludge systems, sludge grows under transient (unbalanced) conditions and storage of internal polymers becomes important. Differences in storage capacity under transients are often used to explain kinetic control of bulking, but storage is neither studied in detail nor usually included in modelling. For this reason, the transient response of different aerobic mixed cultures was studied by experimentally determining the role of storage. Two different mixed cultures (bulking and non-bulking) were selected in an acetate-limited medium, by continuous or intermittent feeding of a CSTR, respectively. Batch tests were used to investigate the transient response of the selected cultures as a function of the starvation time and of the ratio of the initial concentration of the substrate and sludge biomass (So/Xo). In most experimental conditions, both cultures showed that the storage of poly-hydroxybutyrate (PHB) is in general the prevailing mechanism of substrate removal. In particular, the culture dominated by floc-formers showed very fast response to the substrate spike with a high observed yield. Storage was practically the only metabolism occurring. The ratio So/Xo did not have a major role in determining the type and extent of the response. Starvation did not affect the response of the floc-formers to transient conditions. For the filamentous bacteria, both the growth response and, even more significantly, the storage response were negatively affected. Hence, the difference in storage capacity between filamentous and floc-forming bacteria was further increased.

scholarly journals From arteries to boreholes: transient response of a poroelastic cylinder to fluid injection

2018 ◽  
Vol 474 (2216) ◽  
pp. 20180284 ◽  
Author(s):  
L. C. Auton ◽  
C. W. MacMinn
Keyword(s):  
Transient Response ◽  
Large Deformations ◽  
Fluid Pressure ◽  
Soft Materials ◽  
Fluid Injection ◽  
Solid Skeleton ◽  
Fluid Flux ◽  
Vascular Walls ◽  
Initial Geometry

The radially outward flow of fluid through a porous medium occurs in many practical problems, from transport across vascular walls to the pressurization of boreholes in the subsurface. When the driving pressure is non-negligible relative to the stiffness of the solid structure, the poromechanical coupling between the fluid and the solid can control both the steady state and the transient mechanics of the system. Very large pressures or very soft materials lead to large deformations of the solid skeleton, which introduce kinematic and constitutive nonlinearity that can have a non-trivial impact on these mechanics. Here, we study the transient response of a poroelastic cylinder to sudden fluid injection. We consider the impacts of kinematic and constitutive nonlinearity, both separately and in combination, and we highlight the central role of driving method in the evolution of the response. We show that the various facets of nonlinearity may either accelerate or decelerate the transient response relative to linear poroelasticity, depending on the boundary conditions and the initial geometry, and that an imposed fluid pressure leads to a much faster response than an imposed fluid flux.

scholarly journals On the Role of Minor Branches, Energy Dissipation, and Small Defects in the Transient Response of Transmission Mains

Water ◽  
2018 ◽  
Vol 10 (2) ◽  
pp. 187 ◽  
Author(s):  
Silvia Meniconi ◽  
Bruno Brunone ◽  
Matteo Frisinghelli
Keyword(s):  
Energy Dissipation ◽  
Transient Response

The role of parasitic elements in the single-event transient response of linear circuits

2002 ◽  
Vol 49 (6) ◽  
pp. 3115-3120 ◽  
Author(s):  
A.L. Sternberg ◽  
L.W. Massengill ◽  
S. Buchner ◽  
R.L. Pease ◽  
Y. Boulghassoul ◽  
...  
Keyword(s):  
Transient Response ◽  
Single Event ◽  
Single Event Transient ◽  
Linear Circuits

scholarly journals DEHYDRINS PATTERNS IN COMMON BEAN EXPOSED TO DROUGHT AND WATERED CONDITIONS

2014 ◽  
Vol 37 (1) ◽  
pp. 59
Author(s):  
M. Claudia Castañeda-Saucedo ◽  
Leobigildo Córdova-Téllez ◽  
Ernesto Tapia-Campos ◽  
Adriana Delgado-Alvarado ◽  
Víctor A. González-Hernández ◽  
...  
Keyword(s):  
Drought Stress ◽  
Phaseolus Vulgaris ◽  
Common Bean ◽  
Transient Response ◽  
Consensus Sequence ◽  
Protective Role ◽  
Phaseolus Vulgaris L ◽  
Major Constraint ◽  
Induced Proteins

Drought is a major constraint for common bean (Phaseolus vulgaris L.) production in México. Dehydrins are constitutive or stress-induced proteins related with a protective role of membranes and macromolecules against denaturation, thus preventing loss of their function. In this work, seed production and patterns of dehydrins accumulation in leaves and pods were evaluated in common bean cv. ‘Otomí’ subjected to drought, as compared with well-irrigated plants. Drought applied at pod formation and seed filling (SF) reduced yield up to 57 %. An antibody against a consensus sequence present in most dehydrins allowed for dehydrin identification. Two dehydrins of 82 and 73 kDA turned up both in leaves and pods throughout all the evaluated conditions. Presumably, both dehydrins are constitutive in the ‘Otomí’ cultivar. These dehydrins showed higher expression than controls in leaves after 6 d of drought at seedling and SF stages, and in pods 6 d after drought had started at SF. Increased expression might provide better protection during early stages of seedling and seed development. Increments on 63, 36 and 22 kDa dehydrin expression in pods at late SF might coincide with plant developmental programs, which prepare seed for desiccation. Dehydrins of 158, 54, 46, and 41 kDa were detected in pods 10 d after floral opening as a transient response to drought stress in SF. These results indicate dehydrins are relevant during plant development, as well as during drought stress.

Some aspects of the role of holes in the transient response of a-Si:H pin-diodes

1993 ◽  
Vol 164-166 ◽  
pp. 663-666 ◽  
Author(s):  
R. Brüggemann ◽  
C. Main ◽  
G.H. Bauer
Keyword(s):  
Transient Response ◽  
Pin Diodes
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