Results 61 to 70 of about 101,257 (246)

Physics‐Constrained Constitutive Learning of Rate‐Limiting Timescales for Efficient Hydrogen‐Based Direct Reduction for Green Steel Making

Advanced Science, EarlyView.
A conversion‐resolved constitutive framework is developed for the hydrogen‐based direct reduction of iron oxide pellets. Effective reaction and transport timescales are inferred directly from measured trajectories and mapped against operating conditions, pellet architecture, and composition. The analysis reveals how late‐stage transport control emerges
Anurag Bajpai, Barak Ratzker, Pasquale Cavaliere, Dierk Raabe   +3 more
wiley   +1 more source

Tempered Representations and Nilpotent Orbits [PDF]

, 2015
Given a nilpotent orbit O of a real, reductive algebraic group, a necessary condition is given for the existence of a tempered representation pi such that O occurs in the wave front cycle of pi.
Harris, Benjamin
core  

SPICE‐Compatible Compact Modeling of Cuprate‐Based Memristors Across a Wide Temperature Range

Advanced Electronic Materials, EarlyView.
A physics‐guided compact model for YBCO memristors is introduced, incorporating carrier trapping, field‐induced detrapping, and a differential balance equation to describe their switching dynamics. The model is compared with experiments and implemented in LTspice, allowing realistic circuit‐level simulations.
Thomas Günkel, Aleix Barrera, Lluís Balcells, Narcís Mestres, Enrique Miranda, Anna Palau, Jordi Suñé   +6 more
wiley   +1 more source

Semiclassical Quantisation of Finite-Gap Strings

, 2008
We perform a first principle semiclassical quantisation of the general finite-gap solution to the equations of a string moving on R x S^3. The derivation is only formal as we do not regularise divergent sums over stability angles.
Vicedo, Benoit
core   +1 more source

On the 16th Hilbert problem for algebraic limit cycles

Journal of Differential Equations, 2010
For a polynomial planar vector field of degree n ≥ 2 with generic invariant algebraic curves we show that the maximum number of algebraic limit cycles is 1 + (n − 1)(n − 2)/2 when n is even, and (n − 1)(n − 2)/2 when n is odd. Furthermore, these upper bounds are reached.
Llibre Saló, Jaume, Ramírez Inostroza, Rafael Orlando, Sadovskaia Nurimanova, Natalia Guennadievna   +2 more
openaire   +3 more sources

AI in chemical engineering: From promise to practice

AIChE Journal, EarlyView.
Abstract Artificial intelligence (AI) in chemical engineering has moved from promise to practice: physics‐aware (gray‐box) models are gaining traction, reinforcement learning complements model predictive control (MPC), and generative AI powers documentation, digitization, and safety workflows.
Jia Wei Chew, Ronnie Andersson, Thomas Bierweiler, Patrik Ryttestal, Torsten Wik   +4 more
wiley   +1 more source

Technoeconomic and sustainability analysis of batch and continuous crystallization for pharmaceutical manufacturing

AIChE Journal, EarlyView.
Abstract In pharmaceutical industries, continuous manufacturing methods have already been well established to improve productivity and process intensification. However, to better understand the trade‐offs of continuous crystallizers over the existing batch production systems, a robust technoeconomic cost and sustainability analysis is necessary to ...
Jungsoo Rhim, Zoltan K. Nagy
wiley   +1 more source

Shaping bursting by electrical coupling and noise

, 2011
Gap-junctional coupling is an important way of communication between neurons and other excitable cells. Strong electrical coupling synchronizes activity across cell ensembles.
A Ghosh, A Longtin, A Lubotzky, A Sherman, A Sherman, AA Grace, B Bollobas, B Pfeuty, BW Connors, CB Muratov, CC Chow, D Klein, D Terman, DS Goldobin, E Lee, E Manica, EF Mishchenko, EM Izhikevich, G De Vries, Gao Juan, GD Smith, Georgi S. Medvedev, GS Medvedev, GS Medvedev, GS Medvedev, GS Medvedev, GS Medvedev, GS Medvedev, I Karatzas, J Rinzel, J Rubin, J Su, J White, JJ Collins, M Fiedler, M Usher, MG Pedersen, MI Freidlin, MI Freidlin, MV Day, N Kopell, P Hitczenko, P Sarnak, R Kuske, REL DeVille, RJ Butera, RZ Has’minskii, S Coombes, S Hoory, S Lim, S-N Chow, Svitlana Zhuravytska, T Lewis, TR Chay, TR Chay, W Xiao, XJ Wang, ZF Mainen   +57 more
core   +1 more source

Limit cycles and invariant algebraic curves

We give lower bounds in terms of~$n,$ for the number of limit cycles of polynomial vector fields of degree~$n,$ having any prescribed invariant algebraic curve. By applying them when the ovals of this curve are also algebraic limit cycles we obtain a new recurrent property for the Hilbert numbers. Finally, we apply our results to two important families
Gasull, Armengol, Santana, Paulo
openaire   +2 more sources

Uniqueness of limit cycles in polynomial systems with algebraic invariants [PDF]

Bulletin of the Australian Mathematical Society, 1994
The uniqueness of limit cycles is proved for quadratic systems with an invariant parabola and for cubic systems with four real line invariants. Also a new, simple proof is given of the uniqueness of limit cycles occurring in unfoldings of certain vector fields with codimension two singularities.
Zegeling, André, Kooij, Robert E.
openaire   +1 more source