Nisoli, Cristiano, Abraham, Douglas, Lookman, Turab, Saxena, Avadh
We present a general framework to explore thermally activated failures in quasi one dimensional systems. We apply it to the collapse of carbon nanotubes, the formation of bottlenecks in nanowires,...
Thermodynamic theory of dislocation-mediated plasticity (2009)
Langer, J. S., Bouchbinder, Eran, Lookman, Turab
We reformulate the theory of polycrystalline plasticity by writing equations of motion for the flow of energy and entropy associated with dislocations. Within this general framework, and using a...
Thermal Stability of Strained Nanowires (2009)
Nisoli, Cristiano, Abraham, Douglas, Lookman, Turab, Saxena, Avadh
Stranski-Krastanov strained islands undergo a shape anisotropy transition as they grow in size, finally evolving toward nanowires. This effect has been explained until now via simple energetic models...
Hydrodynamic Self-Consistent Field Theory for Inhomogeneous Polymer Melts (2006)
Hall, David M., Lookman, Turab, Fredrickson, Glenn H., Banerjee, Sanjoy
We introduce a mesoscale technique for simulating the structure and rheology of block copolymer melts and blends in hydrodynamic flows. The technique couples dynamic self consistent field theory...
Numerical Method for Hydrodynamic Transport of Inhomogeneous Polymer Melts (2006)
Hall, David M., Lookman, Turab, Fredrickson, Glenn H., Banerjee, Sanjoy
We introduce a mesoscale method for simulating hydrodynamic transport and self assembly of inhomogeneous polymer melts in pressure driven and drag induced flows. This method extends dynamic self...
Domain Size Dependence of Piezoelectric Properties of Ferroelectrics (2004)
Ahluwalia, Rajeev, Lookman, Turab, Saxena, Avadh, Cao, Wenwu
The domain size dependence of piezoelectric properties of ferroelectrics is investigated using a continuum Ginzburg-Landau model that incorporates the long-range elastic and electrostatic...
Viscoelastic Properties of Dynamically Asymmetric Binary Fluids Under Shear Flow (2003)
Dwivedi, Vinay, Ahluwalia, Rajeev, Lookman, Turab, Saxena, Avadh
We study theoretically the viscoelastic properties of sheared binary fluids that have strong dynamical asymmetry between the two components. The dynamical asymmetry arises due to asymmetry between...
Landau Theory For Shape Memory Polycrystals (2003)
Ahluwalia, Rajeev, Lookman, Turab, Saxena, Avadh, Albers, Robert C
We propose a Ginzburg-Landau theory for the elastic properties of shape memory polycrystals. A single crystal elastic free energy for a system that undergoes a square-to-rectangle transformation is...
Electromechanical Properties of Multi-Domain Ferroelectrics (2003)
Ahluwalia, Rajeev, Lookman, Turab, Saxena, Avadh, Cao, Wenwu
We study theoretically the influence of the underlying domain microstructure on the electromechanical properties of ferroelectrics. Our calculations are based on a continuum approach that...
Elastic Deformation of Polycrystals (2002)
Ahluwalia, Rajeev, Lookman, Turab, Saxena, Avadh
We propose a framework to model elastic properties of polycrystals by coupling crystal orientational degrees of freedom with elastic strains. Our model encodes crystal symmetries and takes into...
Glassy behavior in systems with Kac-type step-function interaction (2002)
Loh, Kok-Kiong, Kawasaki, Kyozi, Bishop, Alan R., Lookman, Turab, Saxena, Avadh, Schmalian, Jörg, ...
We study a system with a weak, long-range repulsive Kac-type step-function interaction within the framework of a replicated effective $\phi^4$-theory. The occurrence of extensive configurational...
Phase transition induced hydrodynamic instability and Langmuir-Blodgett Deposition (2001)
Loh, Kok-Kiong, Saxena, Avadh, Lookman, Turab, Parikh, Atul N.
We propose a model to understand periodic oscillations relevant to the origin of mesoscopic channels formed during a Langmuir-Blodgett deposition observed in recent experiments \{M. Gleiche, L.F....
Bogomol'nyi Decomposition for Vesicles of Arbitrary Genus (2001)
Benoit, Jerome, Saxena, Avadh, Lookman, Turab
We apply the Bogomol'nyi technique, which is usually invoked in the study of solitons or models with topological invariants, to the case of elastic energy of vesicles. We show that spontaneous...
Spinodal decomposition in fluids: diffusive, viscous and inertial regimes (1995)
Lookman, Turab, Wu, Yanan, Alexander, Francis, Chen, Shiyi
Using a Langevin description of spinodal decomposition in fluids, we examine domain growth in the diffusive, viscous and inertial regimes. In the framework of this model, numerical results...
Growth Kinetics in Multicomponent Fluids (1994)
The hydrodynamic effects on the late stage kinetics in spinodal decomposition of multicomponent fluids are examined using a lattice Boltzmann scheme with stochastic fluctuations in the fluid and at...
Statistical error in a chord estimator of correlation dimension: the ``rule of five'' (1993)
Theiler, James, Lookman, Turab
The statistical precision of a chord method for estimating fractal dimension from a correlation integral is derived. The optimal chord length is determined, and a comparison is made to other...