Results 61 to 70 of about 91,944 (331)

A Robust Adaptive One‐Sample‐Ahead Preview Super‐Twisting Sliding Mode Controller

International Journal of Adaptive Control and Signal Processing, EarlyView.
Block Diagram of the Robust Adaptive One‐Sample‐Ahead Preview Super‐Twisting Sliding Mode Controller. ABSTRACT This article introduces a discrete‐time robust adaptive one‐sample‐ahead preview super‐twisting sliding mode controller. A stability analysis of the controller by Lyapunov criteria is developed to demonstrate its robustness in handling both ...
Guilherme Vieira Hollweg, Paulo Jefferson Dias de Oliveira Evald, Shivam Chaturvedi, Hilton Abilio Gründling, Rodrigo Varella Tambara, Wencong Su   +5 more
wiley   +1 more source

SLES SURFACTANT AS DRAG REDUCING AGENT WITHIN GASOIL FLOWING THROUGH PIPELINES

Journal of Engineering, 2008
Sodium Lauryl Ether Sulfate (SLES) with five different concentrations (from 50 to 100 ppm) were used as drag reducer. This surfactant was studied using gasoil with seven different fluid flow rates (from 1.9 to 4.5 m3 /h) and a testing section length of ...
Abbas Khalaf Muhammed Shua'ab, Hayder A. Abdul-Bari   +1 more
doaj   +1 more source

Drag Reduction by Polymers in Wall Bounded Turbulence

, 2004
We address the mechanism of drag reduction by polymers in turbulent wall bounded flows. On the basis of the equations of fluid mechanics we present a quantitative derivation of the "maximum drag reduction (MDR) asymptote" which is the maximum drag ...
A. N. Beris, A. Rollin, B. A. Toms, M. J. Rudd, P. S. Virk, P. S. Virk, P.-G. de Gennes, R. B. Bird, S. B. Pope   +8 more
core   +1 more source

A Workflow to Accelerate Microstructure‐Sensitive Fatigue Life Predictions

Advanced Engineering Materials, EarlyView.
This study introduces a workflow to accelerate predictions of microstructure‐sensitive fatigue life. Results from frameworks with varying levels of simplification are benchmarked against published reference results. The analysis reveals a trade‐off between accuracy and model complexity, offering researchers a practical guide for selecting the optimal ...
Luca Loiodice, Krzysztof S. Stopka, Michael D. Sangid   +2 more
wiley   +1 more source

Density Profile Asymptotes at the Centre of Dark Matter Halos

, 2003
For the spherical symmetric case, all quantities describing the relaxed dark matter halo can be expressed as functions of the gravitational potential $\Phi$.
Binney, Binney, Crone, de Blok, de Blok, Dubinski, Eke, El-Zant, Frenk, Fukushige, Ghigna, Ghigna, Hoffman, Iliev, J. P. Mücket, Jing, Klypin, Kravtsov, M. Hoeft, McGaugh, Milgrom, Moore, Moore, Navarro, Navarro, Nusser, Power, Quinn, Sellwood, Shapiro, Springel, Syer, Taylor, Thomas, van den Bosch, Weinberg   +35 more
core   +1 more source

Bianchi VIII Empty Futures [PDF]

, 2001
Using a qualitative analysis based on the Hamiltonian formalism and the orthonormal frame representation we investigate whether the chaotic behaviour which occurs close to the initial singularity is still present in the far future of Bianchi VIII models.
Barrow J D, Belinskii V A, Bogoyavlensky O I, Bogoyavlensky O I, Coley A, Damour T, Doroshkevich A G, Ellis G F R, Halpern P, Hobill D, John D Barrow, Kunze K E, Ryan M P, Uggla C, Wainwright J, Wainwright J, Wainwright J, Yves Gaspar   +17 more
core   +2 more sources

Analyzing Electronic Excitations and Exciton Binding Energies in Y6 Films

Advanced Functional Materials, EarlyView.
The Y6 molecule is used for increasing the efficiency of organic solar cells. The exciton binding energy is calculated for ensembles of Y6 molecules that are representative of the typically used films. The calculations show that the excitons typically spread out over many molecules.
Sahar Javaid Akram, Sophie Meißner, Stephan Kümmel   +2 more
wiley   +1 more source

Assessment of density functional methods with correct asymptotic behavior

, 2013
Long-range corrected (LC) hybrid functionals and asymptotically corrected (AC) model potentials are two distinct density functional methods with correct asymptotic behavior. They are known to be accurate for properties that are sensitive to the asymptote
Chai, Jeng-Da, Li, Guan-De, Su, Yu-Chuan, Tsai, Chen-Wei   +3 more
core   +1 more source

All‐in‐One Analog AI Hardware: On‐Chip Training and Inference with Conductive‐Metal‐Oxide/HfOx ReRAM Devices

Advanced Functional Materials, EarlyView.
An all‐in‐one analog AI accelerator is presented, enabling on‐chip training, weight retention, and long‐term inference acceleration. It leverages a BEOL‐integrated CMO/HfOx ReRAM array with low‐voltage operation (<1.5 V), multi‐bit capability over 32 states, low programming noise (10 nS), and near‐ideal weight transfer.
Donato Francesco Falcone, Victoria Clerico, Wooseok Choi, Tommaso Stecconi, Folkert Horst, Laura Bégon‐Lours, Matteo Galetta, Antonio La Porta, Nikhil Garg, Fabien Alibart, Bert Jan Offrein, Valeria Bragaglia   +11 more
wiley   +1 more source

Theory of concentration dependence in drag reduction by polymers and of the maximum drag reduction asymptote. [PDF]

Physical Review Letters, 2003
A simple model of the effect of polymer concentration on the amount of drag reduction in turbulence is presented, simulated, and analyzed. The qualitative phase diagram of drag coefficient versus Reynolds number (Re) is recaptured in this model ...
R. Benzi, E. Ching, Nizan Horesh, I. Procaccia   +3 more
semanticscholar   +1 more source