We present laser beam astigmatism results obtained by Near-field Scanning Optical Microscopy. Measurements made with this technique on the high reflecting facet of a Graded Index Separate Confinement Heterojunction laser diode indicate the lateral beam waist is outside of the device structure, seemingly in contradiction to far-field measurements made on the low reflecting output facet of the de...

Thisarticle presents the evaluation of static and dynamic behavior of simply supported sigmoid functionally graded ordinary (SFGO) beam. A finite element method is used considering first order shear deformation for the analysis.The element chosen in the present case is different from the conventional elements in the sense that the shape functions of the element is obtained from the exact soluti...

This paper presents for the first time a closed-form solution of dynamic response sigmoid bidirectional functionally graded (SBDFG) microbeams under moving harmonic load and thermal environmental conditions. The formulation is established in context modified couple stress theory to integrate effects microstructure. On basis elasticity theory, nonclassical governing equations are derived by usin...

In this paper, the effects of three types porosity on bending behavior functionally graded porous (FGP) beams are studied. The finite element procedure is established and based simple Timoshenko beam theory. results achieved in paper presented compared with other references to verify feasibility implementing formula writing Matlab code. On hand, can help researchers have an overview beams.

The present work reports the static behaviour of functionally graded rotating beam based on Timoshenko theory, which includes effect shear deformation. principle virtual displacement is applied to derive a governing equation for (FG) beam, considering centrifugal stiffening effect. B-spline collocation technique employed solve differential and material properties are function power law distribu...

Crack tip deformations and fracture parameters in functionally graded glass-filled epoxy beams are experimentally evaluated under static and dynamic loading conditions. Beams with unidirectional, monotonic elastic gradients and cracks along the gradient are examined. SEN samples with increasing or decreasing Young’s modulus ahead of the crack tip are studied in symmetric four-point bending and ...

Analytical relations between the critical buckling load of a functionally graded material (FGM) Timoshenko beam and that of the corresponding homogeneous Euler–Bernoulli beam subjected to axial compressive load have been derived for clamped–clamped (C–C), simply supported–simply supported (S–S) and clamped–free (C–F) edges. However, no such relation is found for clamped–simply supported (C–S) b...

graded Cu„In,Ga...Se2 solar cells using electron beam induced current Gregory Brown, Vladimir Faifer, Alex Pudov, Sergey Anikeev, Eugene Bykov, Miguel Contreras, and Junqiao Wu Nanosolar, Inc, San Jose, California 95138, USA National Renewable Energy Laboratory, Golden, Colorado 80401, USA Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA...