Results 111 to 120 of about 22,331 (301)
Advanced Robotics Research, EarlyView.Robots can learn manipulation tasks from human demonstrations. This work proposes a versatile method to identify the physical interactions that occur in a demonstration, such as sequences of different contacts and interactions with mechanical constraints.
Alex Harm Gert‐Jan Overbeek +3 more
wiley +1 more source
A comparative study of wormhole geometries under two different modified gravity formalism
European Physical Journal C: Particles and FieldsIn the current article, we discuss the wormhole geometries in two different gravity theories, namely $$\texttt{F}(\texttt{Q, T})$$ F ( Q , T ) gravity and $$\texttt{F}(\texttt{R, T})$$ F ( R , T ) gravity.
Sweeti Kiroriwal +3 more
doaj +1 more source
Asymmetry in Skipping Enhances Viability Against Control Input Noise
Advanced Robotics Research, EarlyView.Quadruped animals use asymmetric galloping gaits at high speeds, yet the functional role of this asymmetry remains unclear. This study shows that left–right asymmetry in touchdown angles enhances robustness to control noise. Using a simple two‐legged locomotion model and viability theory, it demonstrates that asymmetric skipping substantially enlarges ...
Yuichi Ambe, Alvin So, Shinya Aoi
wiley +1 more source
A Review of Stable, Traversable Wormholes in f(R) Gravity Theories
SymmetryIt has been proven that in standard Einstein gravity, exotic matter (i.e., matter violating the pointwise and averaged Weak and Null Energy Conditions) is required to stabilize traversable wormholes. Quantum field theory permits these violations due to the quantum coherent effects found in any quantum field.
Ramesh Radhakrishnan +5 more
openaire +2 more sources
Effects of spatial curvature on the f (R) gravity phase space: No inflationary attractor?
, 2019 © 2019 IOP Publishing Ltd Printed in the UK. In this paper we study the effects of spatial curvature of the metric on the phase space of vacuum f (R) gravity.
Oikonomou V., Odintsov S.
core
Investigating $f(R)$ gravity and cosmologies
The f (R) theory of gravity is an extended theory of gravity that is based on general relativity in the simplest case of $f(R) = R$. This theory extends such a function of the Ricci scalar into arbitrary functions that are not necessarily linear, i.e ...
Kalvakota, Vaibhav
core +1 more source
Continuum Mechanics Modeling of Flexible Spring Joints in Surgical Robots
Advanced Robotics Research, EarlyView.A new mechanical model of a tendon‐actuated helical extension spring joint in surgical robots is built using Cosserat rod theory. The model can implicitly handle the unknown contacts between adjacent coils and numerically predict spring shapes from straight to significantly bent under actuation forces.
Botian Sun +3 more
wiley +1 more source
Designing wormholes in novel power-law f(R): a mathematical approach with a linear equation of state
European Physical Journal C: Particles and FieldsWe consider the inhomogeneous Morris–Thorne wormhole metric with matter tensors characterised by a novel linear equation of state in f(R) gravity. Using the Einstein’s field equations in metric f(R) gravity we model solutions for both wormhole as well as
Subhasis Nalui, Subhra Bhattacharya
doaj +1 more source
Notes on f(R) Theories of Gravity
, 2014 In this review paper we present some basic notions about f(R) theories of gravity and some simple cosmological models derived from it. We first make an introduction to General Relativity (GR), followed by the discussion of Gibbons-York-Hawking boundary term in GR.
openaire +2 more sources
Advanced Robotics Research, EarlyView.Pak Biawak, a necrobot, embodies an unusual fusion of biology and robotics. Designed to repurpose natural structures after death, it challenges conventional boundaries between nature and engineering. Its movements are precise yet unsettling, raising questions about sustainability, ethics, and the untapped potential of biointegrated machines.
Leo Foulds +2 more
wiley +1 more source