Results 91 to 100 of about 2,258,481 (223)

The Grassmannian and the Twistor String: Connecting All Trees in N=4 SYM

, 2010
We present a new, explicit formula for all tree-level amplitudes in N=4 super Yang-Mills. The formula is written as a certain contour integral of the connected prescription of Witten's twistor string, expressed in link variables.
Anastasia Volovich, Congkao Wen, D Nandan, E Witten, GP Korchemsky, J Brodel, J Kaplan, Jacob L. Bourjaily, Jaroslav Trnka, JM Drummond, JM Drummond, JM Drummond, L Dolan, L Dolan, LJ Mason, M Bullimore, M Spradlin, N Arkani-Hamed, N Arkani-Hamed, P Griffiths, R Britto, R Britto, R Roiban, R Roiban, R Roiban   +24 more
core   +1 more source

High-Order Time-Integration Schemes with Explicit Time-Splitting Methods

Monthly Weather Review, 2009
Abstract New high-order time-integration schemes for fully elastic models are presented. The new schemes, formulated using the Richardson extrapolation that employs leapfrog-type schemes, can give a good performance for linear model problems and ensure overall stability when they are combined with a forward–backward scheme for fast waves.
Tae-Young Lee, Sang-Hun Park
openaire   +1 more source

CBS stabilization in dynamics of solids using explicit time integration [PDF]

, 2004
The characteristic based split (CBS) stabilization procedure developed originally in fluid mechanics has been adapted successfully to solid mechanics problems.
Oñate Ibáñez de Navarra, Eugenio, Rojek, Jerzy, Taylor, R L   +2 more
core  

High order time integrators for the simulation of charged particle motion in magnetic quadrupoles

, 2018
Magnetic quadrupoles are essential components of particle accelerators like the Large Hadron Collider. In order to study numerically the stability of the particle beam crossing a quadrupole, a large number of particle revolutions in the accelerator must ...
Bonaventura, Luca, Dalena, Barbara, Pugnat, Thomas, Simona, Abele   +3 more
core   +1 more source

A Novel Second-Order Explicit Integration Method for Nonlinear Ordinary Differential Equations in Dynamics

Mathematics
This paper introduces a new explicit integration method for second-order ordinary differential equations (ODEs) commonly encountered in engineering applications. Traditionally, these problems are solved either by reformulating them as first-order systems
Gorka Urkullu, Ibai Coria, Igor Fernández de Bustos, Haritz Uriarte   +3 more
doaj   +1 more source

Adaptivity in Crashworthiness Calculations

Shock and Vibration, 1993
h-Adaptive finite element methods for nonlinear transient analysis by explicit time integration are described. Examples are given of adaptive calculations for simple components and prototype calculations for a full car model.
Ted Belytschko, Sang-Ho Lee, I-Sheng Yeh, Jerry I. Lin, Chen-Shyh Tsay, James M. Kennedy   +5 more
doaj   +1 more source

Discrete-Time Implementation of Continuous Terminal Algorithm With Implicit-Euler Method

IEEE Access, 2019
This paper proposes an alternative implementation for a continuous terminal algorithm (CTA) proposed by Torres-Gonzalez et al. The original CTA is a continuous version of the twisting algorithm (TA), which mitigates the chattering by integrating the ...
Xiaogang Xiong, Wei Chen, Shanhai Jin, Shyam Kamal   +3 more
doaj   +1 more source

Partitioned Nonlinearity Soil–Structure Interaction Analysis for Nuclear Power Plant Structures with Pile Foundations

Buildings
Accurate seismic safety assessment of nuclear power plant (NPP) structures with pile foundations on soft soil sites requires consideration of soil nonlinearity and pile–soil–structure interaction (PSSI).
Lei Gao, Shaolin Chen
doaj   +1 more source

Understanding science teachers’ implementations of integrated STEM curricular units through a phenomenological multiple case study

International Journal of STEM Education, 2018
Background Current reforms in K-12 STEM education call for integration between science, technology, engineering, and mathematics (STEM). Such integration of STEM disciplines at the K-12 level offers students an opportunity to experience learning in real ...
Emily A. Dare, Joshua A. Ellis, Gillian H. Roehrig   +2 more
doaj   +1 more source

Explicit Symplectic Integrators with Adaptive Time Steps in Curved Spacetimes

The Astrophysical Journal Supplement Series
Abstract Recently, our group developed explicit symplectic methods for curved spacetimes that are not split into several explicitly integrable parts but are via appropriate time transformations. Such time-transformed explicit symplectic integrators should have employed adaptive time steps in principle, but they are often difficult in ...
Xin Wu, Ying Wang, Wei Sun, Fuyao Liu, Dazhu Ma   +4 more
openaire   +3 more sources