Probabilistic Determination of the Phreatic Line in River Levees Under Steady-State Conditions and its Effect on the Stability Statement

Coupled map lattices with multidimensional lattice are considered. A method for the determination of the stability of spatially homogeneous and spatially periodic steady-state solutions is derived. This method is based on the determination of the spectrum of the linearized operator by means of Gelfand transformation of some appropriate Banach algebra. The results are applied to several examples.

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Stability of Squeeze-Film-Damper Supported Flexible Rotors

Journal of Engineering for Power ◽

10.1115/1.3446549 ◽

1977 ◽

Vol 99 (4) ◽

pp. 545-551 ◽

Cited By ~ 14

Author(s):

M. D. Rabinowitz ◽

E. J. Hahn

Keyword(s):

Steady State ◽

System Stability ◽

Squeeze Film ◽

Design Data ◽

Flexible Rotors ◽

Wide Range ◽

Single Mass ◽

The Stability ◽

Rotor Mass

Assuming the short bearing approximation and symmetric motions, the stability of the steady-state synchronous operation of centrally preloaded single-mass flexible rotors supported in squeeze-film bearing dampers is theoretically investigated. The stability regions are depicted over a wide range of system parameters and allow for easy determination of the stability of existing steady-state design data. The influence of rotor flexibility, rotor speed, bearing dimensions, lubricant viscosity, rotor mass distribution, and rotor unbalance on rotor-bearing system stability may be readily seen. In the absence of pressurization, instability regions were possible even with relatively high support damping, though no instability was indicated for speeds below the support natural frequency, or for bearing eccentricity ratio <0.4 at any speed. Pressurization of the lubricant supply was found to stabilize the system over the whole range of parameters investigated, regardless of unbalance, which would then be limited only by the bearing clearance. Data are presented which enable the minimum supply pressure to ensure full film lubrication to be conveniently determined.

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Determination of the Stability of Thiamin, Nicotinic Acid and Riboflavin in Whisky over a Six-Month Period

Quarterly Journal of Studies on Alcohol ◽

10.15288/qjsa.1943.3.541 ◽

1943 ◽

Vol 3 (4) ◽

pp. 541-545 ◽

Cited By ~ 3

Author(s):

Arthur F. Novak ◽

Stuart L. Adams

Keyword(s):

Nicotinic Acid ◽

The Stability

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STEADY-STATE DETERMINATION OF FUEL-BOND NITROGEN IN DIESEL AND INDUSTRIAL GAS OIL

Clean Air ◽

10.1615/interjenercleanenv.v8.i4.50 ◽

2007 ◽

Vol 8 (4) ◽

pp. 359-371

Author(s):

A. Medeiros ◽

R. Edenhofer ◽

K. Lucka ◽

H. Kohne

Keyword(s):

Steady State ◽

Gas Oil ◽

State Determination

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Calcium Budgets for Catchments as Interpreted by Strontium Isotopes

Hydrology Research ◽

10.2166/nh.1989.0007 ◽

1989 ◽

Vol 20 (2) ◽

pp. 85-96 ◽

Cited By ~ 33

Author(s):

Gunnar Jacks ◽

Göran Åberg ◽

P. Joseph Hamilton

Keyword(s):

Steady State ◽

Forest Ecosystem ◽

Coniferous Forest ◽

Strontium Isotopes ◽

Runoff Water ◽

Weathering Rate ◽

Weathering Rates ◽

Exchangeable Calcium

Strontium isotopes in precipitation, soil and runoff water can be used to establish a ratio of wet plus dry deposited Sr to Sr released by weathering. This ratio is especially enhanced in areas with old acid Proterozoic rocks (0.6-2.5 Ga) and Archean rocks (>2.5 Ga). Since Sr and Ca behave in an analogous way in the coniferous forest ecosystem the results for Sr can be used for the determination of Ca. If the deposition of calcium can be calculated reasonably accurately the weathering rate can also be estimated. Five catchments have been investigated using this approach. Three of them seem to be close to a steady state, wherein the losses and gains of calcium to the system are equal. In the two southern-most catchments there seems to be an ongoing loss of exchangeable calcium. The loss by runoff occurs with sulphate being the dominant anion. Weathering rates of 1.5 to 4.8 kg Ca/ha year have been estimated.

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A Graphical Method for Storage Coefficient Determination from Quasi-Steady State Flow Data

Hydrology Research ◽

10.2166/nh.1996.0008 ◽

1996 ◽

Vol 27 (4) ◽

pp. 247-254 ◽

Cited By ~ 2

Author(s):

Zekâi Şen

Keyword(s):

Steady State ◽

Graphical Method ◽

Pumping Test ◽

Quasi Steady State ◽

Flow Data ◽

Steady State Flow ◽

Storage Coefficient ◽

State Flow ◽

Aquifer Test

A simple, approximate but practical graphical method is proposed for estimating the storage coefficient independently from the transmissivity value, provided that quasi-steady state flow data are available from a pumping test. In the past, quasi-steady state flow distance-drawdown data have been used for the determination of transmissivity only. The method is applicable to confined and leaky aquifers. The application of the method has been performed for various aquifer test data available in the groundwater literature. The results are within the practical limits of approximation compared with the unsteady state flow solutions.

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Operational Determination of the Activated Sludge Process Using Neural Networks

Water Science & Technology ◽

10.2166/wst.1992.0762 ◽

1992 ◽

Vol 26 (9-11) ◽

pp. 2461-2464 ◽

Cited By ~ 2

Author(s):

R. D. Tyagi ◽

Y. G. Du

Keyword(s):

Neural Network ◽

Neural Networks ◽

Steady State ◽

Activated Sludge ◽

Feedforward Neural Network ◽

Training Data ◽

Activated Sludge Process

A steady-statemathematical model of an activated sludgeprocess with a secondary settler was developed. With a limited number of training data samples obtained from the simulation at steady state, a feedforward neural network was established which exhibits an excellent capability for the operational prediction and determination.

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Determining the Norton’s Equivalent Model of Distribution System with Distributed Generation (DG) for Stability Analysis

Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) ◽

10.2174/2352096511666180723144119 ◽

2019 ◽

Vol 12 (2) ◽

pp. 190-198

Author(s):

Sunny Katyara ◽

Lukasz Staszewski ◽

Faheem Akhtar Chachar

Keyword(s):

Distributed Generation ◽

Normal Condition ◽

Distribution System ◽

Distribution Networks ◽

Equivalent Model ◽

Stability Factor ◽

Matlab Simulation ◽

The Stability ◽

Stability Issues

Background: Since the distribution networks are passive until Distributed Generation (DG) is not being installed into them, the stability issues occur in the distribution system after the integration of DG. Methods: In order to assure the simplicity during the calculations, many approximations have been proposed for finding the system’s parameters i.e. Voltage, active and reactive powers and load angle, more efficiently and accurately. This research presents an algorithm for finding the Norton’s equivalent model of distribution system with DG, considering from receiving end. Norton’s model of distribution system can be determined either from its complete configuration or through an algorithm using system’s voltage and current profiles. The algorithm involves the determination of derivative of apparent power against the current (dS/dIL) of the system. Results: This work also verifies the accuracy of proposed algorithm according to the relative variations in the phase angle of system’s impedance. This research also considers the varying states of distribution system due to switching in and out of DG and therefore Norton’s model needs to be updated accordingly. Conclusion: The efficacy of the proposed algorithm is verified through MATLAB simulation results under two scenarios, (i) normal condition and (ii) faulty condition. During normal condition, the stability factor near to 1 and change in dS/dIL was near to 0 while during fault condition, the stability factor was higher than 1 and the value of dS/dIL was away from 0.

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Synthesis and solvatochromic studies of 2- amino-3-phenolazo1-(4-sulfophenyl)-3-methyi-5-pyrozolone and use it for the determination of trace amount of Nickel (II) in blood samples

International Journal of Bioassays ◽

10.21746/ijbio.2016.10.001 ◽

2016 ◽

Vol 5 (10) ◽

pp. 4920

Author(s):

Amar M. Ali ◽

Hussain. J. Mohammed*

Keyword(s):

Stability Constant ◽

Trace Amount ◽

Benzenesulfonic Acid ◽

Determination Method ◽

Blood Samples ◽

Determination Of Nickel ◽

Normal Human ◽

The Stability ◽

Normal Human Blood

A new, simple, sensitive and rapid spectrophotometric method is proposed for the determination of trace amount of Nickel (II). The method is based on the formation of a 1:2 complex with 4-(4-((2-hydroxy-6-nitrophenyl) diazenyl) -3-methyl-5-oxo-2, 5-dihydro-1H-pyrazol-1-yl) benzenesulfonic acid (2-ANASP) as a new reagent is developed. The complex has a maximum absorption at 516 nm and εmax of 1. 84 X 105 L. mol-1. cm-1. A linear correlation (0. 25 – 4. 0μg. ml-1) was found between absorbance at λmax and concentration. The accuracy and reproducibility of the determination method for various known amounts of Nickel (II) were tested. The results obtained are both precise (RSD was 1. 2 %) and accurate (relative error was 0. 787 %). The effect of diverse ions on the determination of Nickel (II) to investigate the selectivity of the method were also studied. The stability constant of the product was 0. 399 X 106 L. mol-1. The proposed method was successfully applied to the analysis of diabetes blood and normal human blood.

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