Results 221 to 230 of about 16,628 (253)

Stabilization of the unstable steady-state regimes of a flow reactor

Fluid Dynamics, 1989
Stabilization of the unstable regime of a flow reactor with distributed parameters is considered. The stabilizing system relates the rate of supply of material to the reactor to the deviation of the output concentration from the steady-state value. An isothermal autocatalytic reaction is chosen as the simplest reaction for which nonuniqueness of the ...
V. N. Kurdyumov, Yu. S. Ryazantsev
openaire   +3 more sources

Study of the stable and unstable operating regimes of a chemical reactor

Fluid Dynamics, 1988
The problem of the stabilization of the unstable operating regimes of a flow reactor is considered. It is shown that for the same values of the external parameters up to five steady-state regimes may exist, and that without the use of stabilizing systems it is impossible to realize not only the unstable but also some stable regimes.
V. A. Buchin, O. B. Larin
openaire   +3 more sources

Studying unstable regimes of jet interaction with approaching flows

Journal of Engineering Physics, 1989
We present and clarify results from numerical experiments pertaining to the description of unstable flow regimes where supersonic jets are propagated into an oncoming gas flow.
V. V. Kondrashov, R. I. Soloukhin
openaire   +3 more sources

Asymptotic regimes in unstable miscible displacements in random porous media

Advances in Water Resources, 2002
Abstract We study two asymptotic regimes of unstable miscible displacements in porous media, in the two limits, where a permeability-modified aspect ratio, RL=L/H(kv/kh)1/2, becomes large or small, respectively. The first limit is known as transverse (or vertical) equilibrium, the second leads to the problem of non-communicating layers (the Dykstra ...
Z.M. Yang, Y.C. Yortsos, Dominique Salin
openaire   +3 more sources

Lagrange identification of absolutely unstable regimes in wakes

Acta Mechanica, 1997
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Delfs, Jan, Ehrhard, Jan, Meiburg, Eckart, Oertel, Herbert jr.   +3 more
openaire   +3 more sources

Modeling of Unstable Regimes in a Rijke Tube

5th International Symposium on Fluid Structure Interaction, Aeroelasticity, and Flow Induced Vibration and Noise, 2002
In the ducts with mean flows and heat sources, excitation of acoustic eigen modes is possible when unsteady heat release is coupled with pressure perturbations. The simplest device for studying the fundamental principles of thermoacoustic instabilities in the presence of a mean flow is a Rijke tube.
K. I. Matveev, F. E. C. Culick
openaire   +1 more source

On unstable periodic regime of small HAWT

AIP Conference Proceedings, 2012
Dynamics of a small HAWT is studied. The closed mathematical model involving phenomenological description of both aerodynamic load upon turbine blades and permanent magnet electric generator is developed, in order to take into account the inductive reactance of the electric circuit.
Marat Z. Dosaev, Liubov A. Klimina, Yury D. Selyutskiy, Mi-Ching Tsai, Hong-Tzer Yang   +4 more
openaire   +1 more source

On the Unstable Convergence Regime of Gradient Descent

Proceedings of the AAAI Conference on Artificial Intelligence
Traditional gradient descent (GD) has been fully investigated for convex or L-smoothness functions, and it is widely utilized in current neural network optimization. The classical descent lemma ensures that for a function with L-smoothness, the GD trajectory converges stably towards the minimum when the learning rate is below 2 / L. This convergence is
Shuo Chen, Jiaying Peng, Xiaolong Li 0001, Yao Zhao 0001   +3 more
openaire   +1 more source

Wetting in nematic liquid crystals: Study of the unstable regime

Physical Review A, 1992
Dynamic wetting of nematic liquid crystals on substrates inducing a tilted anchoring is unstable for a given range of wetting velocities. This unstable regime is studied and an instability mechanism is given, based on the two characteristics of wetting in nematic liquid crystals: the coupling of the director and velocity fields and the selection of ...
, Jérôme, , Boix
openaire   +2 more sources

Is a standard regime for anticoagulation with heparin in unstable angina adequate?*

Australian and New Zealand Journal of Medicine, 1997
Abstract Aim: To establish the proportion of patients with unstable angina in whom adequate anticoagulation is achieved using a standard regime of intravenous heparin. Method: A prospective series of 108 Emergency Department attendees over a six‐month period with a clinical diagnosis of unstable angina for whom anticoagulation with heparin was ...
M, Duffy, A M, Kelly, S, Bau, P, Rosengarten   +3 more
openaire   +2 more sources