Results 51 to 60 of about 8,709 (260)

Soft Mechanical‐Electrical Logic Using Liquid Metal‐Filled 3D‐Printed Architectures

Advanced Engineering Materials, EarlyView.
We present 3D‐printed soft mechanical–electrical logic elements that use liquid metal–filled silicone tubes actuated by thermoplastic polyurethane/polylactic acid (TPU/PLA) architectures to produce Boolean operations. Complementary normally open and normally closed unit cells perform repeatable binary transitions and can be combined into more complex ...
Christoph Lehmann, Ryan Kalgreen, Laura M. Comella   +2 more
wiley   +1 more source

A Convex Relaxation Bound for Subgraph Isomorphism [PDF]

International Journal of Combinatorics, 2012
In this work a convex relaxation of a subgraph isomorphism problem is proposed, which leads to a new lower bound that can provide a proof that a subgraph isomorphism between two graphs can not be found. The bound is based on a semidefinite programming relaxation of a combinatorial optimisation formulation for subgraph isomorphism and is explained in ...
openaire   +2 more sources

Convex relaxation for solving posynomial programs [PDF]

Journal of Global Optimization, 2009
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Hao-Chun Lu, Han-Lin Li 0003, Chrysanthos E. Gounaris, Christodoulos A. Floudas   +3 more
openaire   +1 more source

Microstructure Modification of Additively Manufactured Mo–9Si–8B by Annealing and Its Effects on High‐Temperature Mechanical Properties

Advanced Engineering Materials, EarlyView.
Postbuild annealing systematically modifies the phase fractions and morphology of EB‐PBF processed Mo–9Si–8B. Quantitative microstructure–property correlations reveal how controlled phase evolution enhances high‐temperature compressive strength and creep resistance.
Christopher Schmidt, Yong Chen, Georg Hasemann, Benjamin Wahlmann, Carolin Körner, Manja Krüger   +5 more
wiley   +1 more source

A Distributed Optimal Control Strategy for DC Microgrids with MPPT-DGs Based on Exact Convex Relaxation and Distributed Observers

Mathematics
With the high penetration of distributed energy resources (DERs), which are characterized by stochasticity and intermittency, traditional centralized optimization methods face challenges such as communication packet loss, low reliability, and poor ...
Ziqing Xia, Xiazijian Zou, Zhangjie Liu, Yue Wu, Jinjing Shi, Xiaochao Hou, Mei Su   +6 more
doaj   +1 more source

Improving Lagrange Dual Bounds for Quadratic Extremal Problems

Кібернетика та комп'ютерні технології, 2020
Introduction. Due to the fact that quadratic extremal problems are generally NP-hard, various convex relaxations to find bounds for their global extrema are used: Lagrangian relaxation, SDP-relaxation, SOCP-relaxation, LP-relaxation, and others.
Oleg Berezovskyi
doaj   +1 more source

A convex-relaxation based method for optimal water-power flow

Energy Reports, 2022
This paper proposes a convex reformulation for the non-linear optimal water-power flow (OWPF) problem to optimize the operation cost of the integrated electricity–water network (IEWN).
Xinyi Li, Zhenyu Wu, Lun Yang, Mingyi Sun, Xia Zhao   +4 more
doaj   +1 more source

Relaxation of convex functionals: the gap problem

Annales de l'Institut Henri Poincaré C, Analyse non linéaire, 2003
It is shown that the relaxed energy \mathcal{F}\left(u,A\right): = \inf \Big\{ \lim\!\! \inf_{n\rightarrow + \infty }\!\int \limits_{A}\! f(x,\nabla u_{n})dx:\{u_{n}\} \subset W_{\text{loc}}^{1,\beta }(A;\mathbb{R}^{d}),\, u_{n}\!\rightarrow\! u \text{ in }L^{1}(A;\mathbb{R}^{d}) \Big\},
ACERBI, Emilio Daniele Giovanni, BOUCHITTE G., FONSECA I.   +2 more
openaire   +4 more sources

An All‐Textile, Mechano‐Capacitive Subtle Movement Sensor

Advanced Functional Materials, EarlyView.
A robust all‐textile capacitive sensor is introduced for measuring subtle body movements without long‐term degradation. By separating mechanical deformation from electrical sensing elements, accuracy, responsiveness, and durability are improved. Simple fabrication methods are presented, electrode effects are analyzed, and performance is validated ...
Easa AliAbbasi, Rachel Freire, Valentin Martinez‐Missir, Vineetha Rallabandi, Paul Strohmeier   +4 more
wiley   +1 more source

Second-order cone AC optimal power flow: convex relaxations and feasible solutions

Journal of Modern Power Systems and Clean Energy, 2018
Optimal power flow (OPF) is the fundamental mathematical model to optimize power system operations. Based on conic relaxation, Taylor series expansion and McCormick envelope, we propose three convex OPF models to improve the performance of the second ...
Zhao YUAN, Mohammad Reza HESAMZADEH
doaj   +1 more source