Results 121 to 130 of about 14,134,355 (324)

A partial Lagrangian approach to mathematical models of epidemiology.

, 2015
This paper analyzes the first integrals and exact solutions of mathematical models of epidemiology via the partial Lagrangian approach by replacing the three first-order nonlinear ordinary differential equations by an equivalent system containing one
R. Naz, I. Naeem, F. Mahomed
semanticscholar   +1 more source

Optimization of 3D‐Printed Structured Packings—Current State and Future Developments

Chemie Ingenieur Technik, EarlyView.
This paper gives an overview about structured packing development for distillation, surveying heuristic development cycles, computational fluid dynamics simulations, and additive manufacturing techniques. The emerging application of shape optimization to improve packings is emphasized, and its benefits, impact, and limitations are discussed.
Dennis Stucke, Sebastian Blauth, Christian Leithäuser, Thomas Grützner   +3 more
wiley   +1 more source

Constraint structure of the generalized Proca model in the Lagrangian formalism

Heliyon
We introduce a novel Lagrangian approach to analyze the dynamical structure of the generalized Proca theory (GP). This method incorporates the A-Z constraint structure of the model within the Lagrangian formalism, providing a precise determination of the
Zahra Molaee, Ahmad Shirzad
doaj   +1 more source

Lagrangian approach embed with discrete element method for extreme deformation study in frangible bullet designs fragmentation and penetration on viscoelastic ballistic gel. [PDF]

Heliyon, 2023
Widyastuti, Wibowo AP, Pramujati B, Lesmana D, Pratama AA, Wijaya SP.   +5 more
europepmc   +1 more source

Board That Transforms: Relationship Between Board Structure and Environmental, Social, and Governance Performance in BRICS Countries

Corporate Social Responsibility and Environmental Management, EarlyView.
ABSTRACT The purpose of this study is to examine the relationship between board composition characteristics and ESG performance in companies from BRICS countries, and to assess how sector sensitivity moderates this relationship. A sample of 2045 BRICS companies was examined using panel data regression with random effects and logistic regression ...
Geovane Camilo dos Santos, Cíntia de Melo de Albuquerque Ribeiro, Elis Regina de Oliveira   +2 more
wiley   +1 more source

Fully differentiable Lagrangian convolutional neural network for physics-informed precipitation nowcasting

Applied Computing and Geosciences
This paper presents a convolutional neural network model for precipitation nowcasting that combines data-driven learning with physics-informed domain knowledge.
Peter Pavlík, Martin Výboh, Anna Bou Ezzeddine, Viera Rozinajová   +3 more
doaj   +1 more source

Relativistic Motion of Stars near Rotating Black Holes

Galaxies, 2018
Formulation of the Lagrangian approach is presented for studying features of motions of stellar bodies with non-zero rest mass in the vicinity of fast-spinning black holes. The structure of Lagrangian is discussed.
Elizabeth P. Tito, Vadim I. Pavlov
doaj   +1 more source

Controlled Lagrangians and Stabilization of the Discrete Cart-Pendulum System [PDF]

, 2006
Matching techniques are developed for discrete mechanical systems with symmetry. We describe new phenomena that arise in the controlled Lagrangian approach for mechanical systems in the discrete context.
Bloch, Anthony M., Leok, Melvin, Marsden, Jerrold E., Zenkov, Dmitry V.   +3 more
core  

Slit tube responses and rock fracture characteristics in slit charge blasting under high in situ stress

Deep Underground Science and Engineering, EarlyView.
In this article, the finite element method‐smoothed particle hydrodynamics adaptive coupling algorithm is applied to numerically simulate and analyze the dynamic response of the slit tube and the crack propagation under high in situ stress. The dynamic response of the slit tube mainly exhibits radial response in the vertical direction of the slit and ...
Zhe Sui, Liyun Yang, Lijun Wu, Chenxi Ding   +3 more
wiley   +1 more source

The Clebsch potential approach to fluid Lagrangians

Journal of Geometry and Physics, 2017
The clebsch potential approach to fluid lagrangians is developed in order to establish contact with other approaches to fluids. Three variants of the perfect fluid approach are looked at. The first is an explicit linear lagrangian constructed directly from the clebsch potentials, this has fixed equation of state and explicit expression for the pressure
openaire   +3 more sources