scholarly journals Magnetic and geometric control of spin textures in the itinerant kagome magnet Fe3Sn2

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Markus Altthaler ◽  
Erik Lysne ◽  
Erik Roede ◽  
Lilian Prodan ◽  
Vladimir Tsurkan ◽  
...  
Keyword(s):  
Geometric Control

Autonomous Satellite Rendezvous and Proximity Operations via Geometric Control Methods

2021 ◽  
Author(s):  
Alexander A. Soderlund ◽  
Sean Phillips ◽  
Anonto Zaman ◽  
Christopher D. Petersen
Keyword(s):  
Geometric Control ◽  
Control Methods ◽  
Proximity Operations

Palladium-catalyzed geometrically selective hydrogenation of (Z)-trifluoromethyl alkenyl triflate: an efficient approach to (Z) or (E)-3,3,3-trifluoropropenyl derivatives

2017 ◽  
Vol 15 (27) ◽  
pp. 5693-5700 ◽  
Author(s):  
Yilong Zhao ◽  
Yuhan Zhou ◽  
Chunxia Zhang ◽  
Huan Wang ◽  
Jinfeng Zhao ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
Geometric Control ◽  
Efficient Approach ◽  
Palladium Catalyzed

Synthesis of (Z)- or (E)-3,3,3-trifluoropropenyl derivatives with excellent divergent geometric control via hydrogenation of (Z)-trifluoromethyl alkenyl triflates.

Optimal Geometric Control Applied to the Protein Misfolding Cyclic Amplification Process

2014 ◽  
Vol 135 (1) ◽  
pp. 145-173 ◽  
Author(s):  
Monique Chyba ◽  
Jean-Michel Coron ◽  
Pierre Gabriel ◽  
Alain Jacquemard ◽  
Geoff Patterson ◽  
...  
Keyword(s):  
Protein Misfolding ◽  
Geometric Control ◽  
Protein Misfolding Cyclic Amplification ◽  
Amplification Process

Geometric-control formulation and averaging analysis of the unsteady aerodynamics of a wing with oscillatory controls

2021 ◽  
Vol 928 ◽  
Author(s):  
Haithem E. Taha ◽  
Laura Pla Olea ◽  
Nabil Khalifa ◽  
Cody Gonzalez ◽  
Amir S. Rezaei
Keyword(s):  
Control Theory ◽  
Stokes Equations ◽  
Unsteady Aerodynamics ◽  
Geometric Control ◽  
Navier Stokes ◽  
Analysis Tool ◽  
Geometric Control Theory ◽  
Reduced Order ◽  
Nonlinear Control Theory ◽  
Generation Mechanisms

Differential-geometric-control theory represents a mathematically elegant combination of differential geometry and control theory. Practically, it allows exploitation of nonlinear interactions between various inputs for the generation of forces in non-intuitive directions. Since its early developments in the 1970s, the geometric-control theory has not been duly exploited in the area of fluid mechanics. In this paper, we show the potential of geometric-control theory in the analysis of fluid flows, exemplifying it as a heuristic analysis tool for discovery of symmetry-breaking and unconventional force-generation mechanisms. In particular, we formulate the wing unsteady aerodynamics problem in a geometric-control framework. To achieve this goal, we develop a reduced-order model for the unsteady flow over a pitching–plunging wing that is (i) rich enough to capture the main physical aspects (e.g. nonlinearity of the flow dynamics at large angles of attack and high frequencies) and (ii) efficient and compact enough to be amenable to the analytic tools of geometric nonlinear control theory. We then combine tools from geometric-control theory and averaging to analyse the developed reduced-order dynamical model, which reveals regimes for lift and thrust enhancement mechanisms. The unsteady Reynolds-averaged Navier–Stokes equations are simulated to validate the theoretical findings and scrutinize the underlying physics behind these enhancement mechanisms.

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