Sharif Digital Repository

Gapless chiral excitons in thin films of topological insulators

Author

Jafari, S. A.

Pub. Year

2014

Collective excitations and the nature of Mott transition in undoped gapped graphene

Author

Jafari, S. A.

Pub. Year

2012

Subjects

Collective excitations. / Composite bosons. / Critical points. / Critical value. / Dirac fermions. / Dynamical mean-field theory. / Energy scale. / Gap parameter. / Hubbard interaction. / Low energies. / Luttinger liquids. / Mott insulators. / Mott transitions. / Short range interactions. / Spin-charge separation. / Undoped systems. / Graphene. / Mean field theory. / Velocity.

Nonlinear optical response in gapped graphene

Author

Jafari, S. A.

Pub. Year

2012

Subjects

Closed-form formulae. / Covariant. / Dirac theory. / Functional dependence. / Logarithmic singularity. / Low energies. / Non-linear optical. / Nonlinear optical response. / Optical nonlinearity. / Response functions. / Single particle spectrum. / Graphene. / Nonlinear optics.

Exact phase boundaries and topological phase transitions of the XYZ spin chain

Author

Jafari, S. A.

Pub. Year

2017

Subjects

Chains. / Charge density. / Charge density waves. / Phase boundaries. / Phase space methods. / Spin dynamics. / Statistical mechanics. / Winding. / Co-ordinate system. / Geometric progressions. / Identified parameter. / Order parameter. / Parameter spaces. / Renormalization group. / Simple derivations. / Topological phase. / Topology.

Electric field assisted amplification of magnetic fields in tilted Dirac cone systems

Author

Jafari, S. A.

Publisher

American Physical Society,

Pub. Year

2019

Subjects

Electric fields. / Landforms. / Electric and magnetic fields. / Geometric description. / Layered organic conductors. / Lorentz transformations. / Magnetic and electric fields. / Minkowski space-time. / Perpendicular magnetic fields. / Quantum oscillations. / Magnetic fields.

Tilted-Lorentz symmetry

Author

Jafari, S. A.

Publisher

Isfahan University of Technology,

Pub. Year

2020

Subjects

Spacetime in solid state physics. / Tilted Lorentz group. / Dirac cone.

Analysis and simulation of ring resonator silicon electro-optic modulators based on PN junction in reverse bias

Author

Jafari, O.

Pub. Year

2014

Subjects

Coupled resonators. / Guided waves. / Micro-optical devices. / Modulators. / Optoelectronics. / PN junction. / Ring resonator. / Conformal mapping. / Guided electromagnetic wave propagation. / Linear transformations. / Optical resonators. / Optoelectronic devices. / Resonators. / Silicon. / Spectrum analysis. / Waveguides. / Conformal transformation. / Coupled resonator. / Electro-optic modulators. / Frequency spectrum analysis. / Microoptical devices. / P-n junction. / Planar optical waveguides. / Light modulators.

Neural network-based brain tissue segmentation in MR images using extracted features from intraframe coding in H.264

Author

Jafari, M.

Pub. Year

2012

Subjects

Artificial neural network classifier. / Artificial Neural Network. / Back-propagation neural networks. / Brain tissue. / Brain tissue segmentation. / Classification accuracy. / Coding standards. / Gray matter. / H.264/AVC. / Intraframe coding. / Medical images. / MR images. / Network-based. / Tumor tissues. / White matter. / Brain. / Cerebrospinal fluid. / Codes (symbols) / Compression ratio (machinery) / Computational complexity. / Feature extraction. / Image coding. / Image segmentation. / Motion Picture Experts Group standards. / Neural networks. / Tissue. / Computer vision.

Automatic brain tissue detection in MRI images using seeded region growing segmentation and neural network classification

Author

Jafari, M.

Pub. Year

2011

Subjects

Artificial neural network. / Brain tumor detection. / Classification. / Connected component labeling. / Feature extraction and selection. / Seeded region growing segmentation.

Microstructure generation of severely deformed materials using Voronoi diagram in Laguerre geometry: Full algorithm

Author

Jafari, R.

Pub. Year

2011

Subjects

Applied strain. / Deformation strain. / Deformed samples. / Edge number distribution. / Gamma distribution. / Gamma distribution function. / Inhomogeneities. / Laguerre geometry. / Low strains. / Simulated microstructures. / Uniform structure. / Voronoi cell. / Voronoi diagrams. / Computational geometry. / Distribution functions. / Grain refinement. / Graphic methods. / Microstructure. / Strain. / Poisson distribution.

Three-qubits ground state and thermal entanglement of anisotropic Heisenberg (XXZ) and Ising models with Dzyaloshinskii-Moriya interaction

Author

Jafari, R.

Pub. Year

2011

Subjects

DM interaction. / Quantum information. / Thermal entanglement. / Three qubit.

Fibre position effects on the operation of opto-pair fibre displacement sensors

Author

Jafari, R.

Pub. Year

2011

Subjects

Displacement. / Double-fibre. / Laser diode. / Active regions. / Axial distance. / Cladding diameters. / Dead regions. / Displacement measurements. / Displacement sensor. / Fibre probe. / Operational performance. / Optical fibre. / Output power. / Position effect. / Reflected power. / Reflective surfaces. / Reproducibilities. / Response curves. / Sensor performance. / Theoretical models. / Theoretical prediction. / Time stability. / Time-scales. / Hysteresis. / Optical fibers. / Probes. / Sensors. / Fibers.

Fast intra- and inter-prediction mode decision of H.264/AVC for medical frame compression based on region of interest

Author

Jafari, M.

Pub. Year

2011

Subjects

Adaptive search range decision. / H.264/AVC. / Intra- and inter-prediction. / Medical video compression. / Region of interest.

Simulation of three different double-fiber probes for reflection sensing

Author

Jafari, R.

Pub. Year

2010

Subjects

Fiber. / Target. / Beam. / Crucial parameters. / Numerical aperture. / Optimum conditions. / Overlap. / Proper modeling. / Reflection measurements. / Design. / Geometry. / Probes. / Reflection. / Targets. / Transmitters. / Fibers.

Experimental and analytical evaluation of rubberized polymer concrete

Author

Jafari, K.

Pub. Year

2017

Subjects

Destructive tests and nondestructive methods. / Rubberized polymer concrete. / Statistical analysis. / Aggregates. / Compressive strength. / Concretes. / Crystal structure. / Digital signal processing. / Epoxy resins. / Interfaces (materials) / Light velocity. / Mechanical properties. / Nondestructive examination. / Polymers. / Repair. / Rubber. / Scanning electron microscopy. / Signal processing. / Statistical methods. / Taguchi methods. / Tensile testing. / X ray diffraction. / Electrical conductivity. / Interaction parameters. / Microstructure analysis. / Nondestructive methods. / Polymer concretes. / Repair and rehabilitations. / Splitting tensile tests. / Ultrasonic pulse velocity. / Ultrasonic testing.

Optimization and simulation of micrometre-scale ring resonator modulators based on p-i-n diodes using firefly algorithm

Author

Jafari, O.

Publisher

Elsevier GmbH,

Pub. Year

2017

Subjects

Coupled resonators. / Firefly algorithm. / Guided waves. / Micro-optical devices. / Modulators. / Optimization. / Optoelectronics. / p-i-n diodes. / Bioluminescence. / Conformal mapping. / Diodes. / Frequency response. / Guided electromagnetic wave propagation. / Optical resonators. / Optoelectronic devices. / Resonators. / Time domain analysis. / Coupled resonator. / Firefly algorithms. / Microoptical devices. / PiN diode. / Ring resonator. / Light modulators.

On the chromatic number of generalized kneser graphs

Author

Jafari, A.

Publisher

University of Calgary,

Pub. Year

2017

Interface between tire and pavement

Author

Jafari, K.

Pub. Year

2017

Subjects

British pendulum tester. / Polymer concrete. / Tire-pavement interface. / Abrasion. / Asphalt concrete. / Cements. / Compressive strength. / Concretes. / Crashworthiness. / Energy dissipation. / Friction. / Impact strength. / Pendulums. / Tires. / Tribology. / Wear resistance. / British Pendulum. / Cement concrete. / Direct shear test. / Loaded wheel tester. / Polymer concretes. / Sliding friction coefficient. / Tire pavement. / Pavements. / Asphalt. / Cement. / Concrete. / Interface. / Pavement. / Shear test. / Sliding. / Testing method. / Tire.

Tannakian formalism for fiber functors over tensor categories

Author

Jafari, A.

Pub. Year

2017

Subjects

Fiber functor. / Framed object. / Hopf algebra. / Hopf algebroid. / Module category. / Tannakian category.