Results 31 to 40 of about 89,446 (238)

Towards a Resolution of the Cosmological Singularity in Non-local Higher Derivative Theories of Gravity

, 2010
One of the greatest problems of standard cosmology is the Big Bang singularity. Previously it has been shown that non-local ghostfree higher-derivative modifications of Einstein gravity in the ultra-violet regime can admit non-singular bouncing solutions.
A. Lawrence, A. Mazumdar, A. Sen, A.S. Koshelev, Anupam Mazumdar, B. Craps, B. Craps, B. Dragovich, C. de Rham, C. Deffayet, C.B. Thorn, E. Coletti, F. Hoyle, G. Calcagni, H. Bondi, H. Liu, H.J. Schmidt, I. Ellwood, I.P. Neupane, I.P. Neupane, I.Y. Aref'eva, I.Y. Aref'eva, I.Y. Aref'eva, I.Y. Aref'eva, I.Y. Aref'eva, J.D. Barrow, J.D. Barrow, K. Enqvist, K. Krasnov, K. Krasnov, K. Krasnov, L. Cornalba, M. Berkooz, M. Kiermaier, M. Schnabl, M.G. Brown, N. Arkani-Hamed, N. Barnaby, N. Barnaby, N. Barnaby, N. Barnaby, N. Barnaby, N. Jokela, N. Moeller, N. Seiberg, P. Stephens, R. Allahverdi, R. Allahverdi, S. Elitzur, S. Hirano, S. Nojiri, S. Weinberg, S. Weinberg, S.W. Hawking, T. Biswas, T. Biswas, T. Biswas, T. Biswas, T. Biswas, T. Erler, T. Koivisto, T.G. Rizzo, Tirthabir Biswas, Tomi Koivisto, W. Siegel, W. Taylor, Y. Okawa, Y.-F. Cai, Y.-F. Cai, Y.-F. Cai   +69 more
core   +1 more source

Topological Point Defects in SmC* Liquid Crystals Under Mechanical Disturbance

Advanced Materials Interfaces, EarlyView.
Tangetial air jet shear inducess island formation and nucleates topological point defects in uniform SmC films. Island bounded by edge dislocation loops shrink and transform into isolated point defects under continued shear. Mechanical perturbatio provides a controllable route for defect engineering in smectric liquid crystal thin films.
Gunganist Kongklad, Vandana Molahalli, Apichart Pattanaporkratana, Nattaporn Chattham   +3 more
wiley   +1 more source

Multiobjective Codesign Optimization of a Planar Pneumatic Artificial Muscle‐Based Snake‐Like Robot for Enhanced Agility and Energy Efficiency

Advanced Robotics Research, EarlyView.
A codesign multiobjective optimization framework was developed to enhance the morphology and controller of a snake‐like robot driven by artificial muscles. It improved planar locomotion, agility, and power efficiency. The approach optimized link geometry and controller gains, revealing that shorter muscles near joints and longer linkages maximize ...
Ayla Valles, Mahdi Haghshenas‐Jaryani
wiley   +1 more source

One-loop Partition Functions of 3D Gravity [PDF]

, 2008
We consider the one-loop partition function of free quantum field theory in locally Anti-de Sitter space-times. In three dimensions, the one loop determinants for scalar, gauge and graviton excitations are computed explicitly using heat kernel techniques.
Giombi, Simone, Maloney, Alexander, Yin, Xi   +2 more
core   +2 more sources

Solution of n-th order intuitionistic fuzzy differential equation by variational iteration method

Notes on Intuitionistic Fuzzy Sets, 2018
: In this paper, the variational iteration method proposed by Ji-Huan He is applied to solve n-th order intuitionistic fuzzy differential equations with intuitionistic fuzzy initial conditions.
S. Melliani, H. Atti, B. Ben Amma, L. Chadli   +3 more
semanticscholar   +1 more source

Exact traveling wave solutions for (2+1)-dimensional Konopelchenko-Dubrovsky equation by using the hyperbolic trigonometric functions methods

International Journal of Mathematics and Computer in Engineering, 2023
In this research, the extended rational sinh-cosh method and the modified extended tanh-function method for mathematically constructing traveling wave solutions to the (2+1)-dimensional integro-differential Konopelchenko-Dubrovsky evolution equation are ...
A. Mahmud, T. Tanriverdi, K. A. Muhamad
semanticscholar   +1 more source

Compliant Pneumatic Feet with Real‐Time Stiffness Adaptation for Humanoid Locomotion

Advanced Robotics Research, EarlyView.
A compliant pneumatic foot with real‐time variable stiffness enables humanoid robots to adapt to changing terrains. Using onboard vision and pressure control, the foot modulates stiffness within each gait cycle, reducing impact forces and improving balance. The design, cast in soft silicone with embedded air chambers and Kevlar wrapping, offers durable,
Irene Frizza, Hiroshi Kaminaga, Philippe Fraisse, Gentiane Venture   +3 more
wiley   +1 more source

Dispersive and Strichartz estimates for hyperbolic equations with constant coefficients

, 2008
Dispersive and Strichartz estimates for solutions to general strictly hyperbolic partial differential equations with constant coefficients are considered. The global time decay estimates of $L^p-L^q$ norms of propagators are obtained, and it is shown how
Ruzhansky, Michael, Smith, James
core   +2 more sources

Universal Gripper for Industrial Manipulation With Enhanced Rigid Mechanics and Self‐Adaptable Fingers

Advanced Robotics Research, EarlyView.
An enhanced universal gripper combining rigid mechanics with self‐adaptable fingers is presented for industrial automation. The novel six‐bar linkage with integrated compliant pad eliminates mechanical interference while enabling passive shape adaptation.
Muhammad Usman Khalid, Nirmal Kumar Ravikumar, Mattia Frascio, Sumanth Nagalakunta, Alessandro Seitone, Benoît Lévesque, Alessandro Zanella, Matteo Zoppi   +7 more
wiley   +1 more source

FiN‐Kiri: Fabric‐Based Inflatable Kirigami Actuator for Multimodal Soft Robots

Advanced Robotics Research, EarlyView.
This study introduces a type of inflatable fabric‐based kirigami actuator capable of performing bending motion. The actuator is utilized as soft grippers, a crawling robot and a swimming robot. The crawling robot demonstrated extraordinary motion capabilities, such as moving forward, turning and navigating a narrow tunnel.
Yang Yu, Yupei Zhang, Yanqi Yin, Yehui Wu, Jinyao Zhang, Ruiyu Bai, Jiaqiang Yao, Kewei Su, Chenyi Yu, Zhicheng Tian, Naipeng Li, Zhuang Zhang, Bo Li   +12 more
wiley   +1 more source