There are three requirements in making a traveling wave accelerator: longitudinal electric field, synchronization, and confinement. We present and analyze a conceptually new kind of charged particle accelerator, making use of a photonic band gap lattice for field confinement near the beam axis, and employing dielectric material to produce a speed of light synchronous longitudinal electric field...

in this work, we report, optical properties of cd1-xsnxte quantum dots (x= 0.05, 0.10 and 0.15) synthesized in water using thioglycolic acid (tga) as a modifier agent. the optical characterization of the samples was performed through absorption (uv) and photoluminescence spectra (pl). a red shift absorption and fluorescent emission peaks was observed which can be related to the increase of nano...

Numerical simulations using the finite element method (FEM) verify the light confinement effect observed in nano-scale solid immersion lenses (SILs). As observed in experiments, a strong light confinement occurs on the bottom surface of the SILs in simulation. The numerical spot size is comparable to the experimental spot size, and provides some insight into the deviation from the analytical ex...

A theory based electron thermal diffusivity has been proposed recently which is based on electron drift wave turbulence. When account is taken for the effect of local shear changes that are produced in high poloidal beta equilibrium this theory is seen to predict the observed improvement of tokamak confinement with plasma current. Confinement is seen to be good at low poloidal beta, degrade as ...

The correlation between the Raman peak shift and the linewidth of porous silicon is studied. The experimental result does not fit with the relationship predicted by the phonon confinement model. By taking into account both the phonon confinement and ‘the effect of strain, the calculated Raman line shape coincides fairly well with the measured spectrum. The built-in strain of porous silicon vari...

Place: Sala de Grados, Módulo 8. When: 11:00, Tuesday, 9 May, 2017. Program: Defense by Mr. Miguel González Pinto, Department of Theoretical Condensed Matter Physics, Universidad Autónoma de Madrid. Title: Entropy, Order and 2D Confinement of Hard Particles. Thesis Directors: Enrique Velasco – Department of Theoretical Condensed Matter Physics, Universidad Autónoma de Madrid and Yuri Martínez –...

Microfluidic droplet technology has been developing rapidly. However, precise control of dynamical behaviour of droplets remains a major hurdle for new designs. This study is to understand droplet deformation and breakup under simple shear flow in confined environment as typically found in microfluidic applications. In addition to the Newtonian–Newtonian system, we consider also both a Newtonia...

Within the Hamiltonian approach to Yang-Mills theory in Coulomb gauge the ghost and gluon propagators are determined from a variational solution of the Yang–Mills Schrödinger equation showing both gluon and heavy quark confinement. The continuum results are in good agreement with lattice data. The ghost form factor is identified as the dielectric function of the Yang–Mills vacuum and the Gribov...

We numerically solve the nonlinear Poisson–Boltzmann equation for two cylinders confined by two parallel charged plates. The repulsive electrical double layer component of the cylinder pair potential is substantially reduced by confinement between like-charged plates. While the effective cylinder surface charge is increased by the confinement, the effective interaction screening length is reduc...

We have explored morphology of DNA molecules bound with Cu complexes of piroxicam (a non-steroidal anti-inflammatory drug) molecules under one-dimensional confinement of thin films and have studied the effect of counterions present in a buffer. X-ray reflectivity at and away from the Cu K absorption edge and atomic force microscopy studies reveal that confinement segregates the drug molecules p...