Results 41 to 50 of about 19,638 (106)

Electrothermal Twisted and Coiled Polymer Artificial Muscles and Their Applications in Soft Robotics

open access: yesSmall Structures, Volume 7, Issue 5, May 2026.
Researchers develop a PE@SPN electrothermal polymer artificial muscle with a parallel‐stranded spiral structure. A temperature self‐sensing‐driven hierarchical closed‐loop fractional order PID (FOPID) control scheme is adopted. A rehabilitation manipulator was designed, and subsequently, a series of experiments are conducted to test the performance of ...
Yali Han   +6 more
wiley   +1 more source

Nonparametric efficiency and artificial intelligence techniques in higher education: a systematic literature review and bibliometric analysis

open access: yesInternational Transactions in Operational Research, Volume 33, Issue 3, Page 1427-1464, May 2026.
Abstract In a sector that needs to work as efficient as possible, artificial intelligence (AI) can guide the efficiency improvements of higher education institutions (HEIs). This paper explores both the AI literature and the efficiency literature as applied to HEIs following the Preferred Reporting Items for Systematic Review guidelines. The goal is to
Anna Rita Dipierro   +2 more
wiley   +1 more source

Lift & Project Systems Performing on the Partial-Vertex-Cover Polytope

open access: yes, 2020
We study integrality gap (IG) lower bounds on strong LP and SDP relaxations derived by the Sherali-Adams (SA), Lovasz-Schrijver-SDP (LS+), and Sherali-Adams-SDP (SA+) lift-and-project (L&P) systems for the t-Partial-Vertex-Cover (t-PVC) problem, a ...
Georgiou, Konstantinos   +5 more
core  

Stochastic Optimization of Non‐Convex Component Solution Spaces

open access: yesInternational Journal for Numerical Methods in Engineering, Volume 127, Issue 8, 30 April 2026.
ABSTRACT In systems engineering, solution spaces provide a practical way to reconcile competing goals by working with sets of good designs instead of point‐based solutions. Earlier contributions, however, were restricted either by limiting the dimensionality per component or, more recently, by constraining these spaces to be convex, which can, in some ...
Eduardo Rodrigues Della Noce   +1 more
wiley   +1 more source

Rational Inefficiencies [PDF]

open access: yes
In this paper, we suggest that inefficiency may be an indirect, on-the-job compensation to agents in an organization. We show how to use actual production data to reveal the trade-offs between different inefficiencies (slacks).
Bogetoft, Peter, Hougaard, Jens Leth
core   +1 more source

On polyhedral approximations of the positive semidefinite cone

open access: yes, 2018
Let $D$ be the set of $n\times n$ positive semidefinite matrices of trace equal to one, also known as the set of density matrices. We prove two results on the hardness of approximating $D$ with polytopes. First, we show that if $0 < \epsilon < 1$ and $A$
Fawzi, Hamza
core  

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