The photothermal deflection technique is used to measure the thermal diffusivity of a metal+eramic composite. The present, as well as other data on composites are analyzed to estimate a value for the Kapitza radius, rk, which represents the effectivevalue of the thermal boundary resistance of heterointerfaces. Remarkably, the data from different metal+eramic composite materials lead to a simila...

A micro-scale resonator suspended over a substrate and illuminated with a continuous wave (CW) laser forms an interferometer which couples deflection of the resonator to light absorption. In turn, absorption creates temperature and thermal stress fields which feedback into the motion. Experiments have shown that this coupling can lead to limit cycle oscillations in which the resonator vibrates ...

The development of a novel polymer-based micro robotic gripper that can be actuated in a liquid medium is presented in this paper. The basic structure for the gripper is a trimorph thermal actuator with a platinum metal heater encapsulated by poly-para-xylylene C (parylene C) polymer layers. Due to the large difference of thermal expansion coefficients of the different layers, the actuator can ...

The purpose of this study was to compare the activation and deactivation forces generated during first-order archwire deflections when different sizes and types of NiTi wires are paired with conventional and self-ligating brackets (SLBs) and to evaluate the rotational control between these same archwire and bracket combinations. Four maxillary premolar SLBs (Damon 3MX, SmartClip, Carriere, and ...

We have developed the theory for using the deflection of laser beams of various wavelengths to determine molecular and thermal diffusion coefficients in multicomponent mixtures. In the past, simultaneous determination of molecular and thermal diffusion coefficients have only been achieved for binaries. Our procedure is faster and more accurate than the current techniques to determine molecular ...

The present article deals with the analysis of thermal-bending stresses in a heated thin annular sector plate with simply supported boundary condition under transient temperature distribution using Berger’s approximate methods. The sectional heat supply is on the top face of the plate whereas the bottom face is kept at zero temperature. In this study, the solution of heat conduction is obtained...

A time resolved measurement of the thermaly induced surface deformation has been carried out using visible light-based photothermal deflection technique. Thermal conductivity coefficients were determined for several semiconductor materials. Problems of the experimental data interpretation with respect to the effect of 2D/3D heat source excitation and the potential advantages of the time resolve...

based on two-dimensional plane stress and bifurcation functional from hill's general theory in polar coordinate the critical condition for elastic wrinkling of the flange of a circular blank ( the wave number in the flange and wrinkled area) during the deep-drawing process are obtained analyticaly to improve the previous given results. in this analytical study, the elastic limitation of the mat...