In this paper a general analytical solution is obtained to find stress distribution in a finite elastic plate with a circular or square hole subjected to arbitrary biaxial partial loading using modified boundary condition by assuming plane stress conditions. The method employed is based on solution of circular hole in finite rectangular plate. This plate is mapped to circular ones and the parti...

A wireless sensor network (WSN) is an effective surveillance tool for various applications. One of its functional bases is coverage. Stochastic node dropping and node failure greatly impair coverage, creating sensing holes, while redundant sensors may exist in other areas in the network. This problem was not considered before and we propose first solutions to it. We propose a family of localize...

Micro-cantilevers are now gaining popularity in biomolecular sensing. Monitoring and mass detection of biological species can be accurately determined using the microor nanoscale cantilevers. The targeted biological molecules are first immobilized onto the microcantilever which is later determined through static or dynamic techniques. Optical detection method is employed to determine the deflec...

Solid state devices are used more and more to provide computerised control and sensing in high temperature environments. The market for electronics, in instrumentation and control systems in down-hole applications for petroleum exploration, requires increased performance from electronic components in terms of both duration and temperature. Substantial improvements in performance and cost of com...

This study presents the first high-resolution dataset of dissolved oxygen (DO) measurements in an ice-lidded cryoconite hole on Canada Glacier, McMurdo Dry Valleys, Antarctica. Fibre optic DO minisensors were installed in a cryoconite hole prior to seasonal internal melting and hydrological connection to the subsurface drainage system. Oxygen air saturation in the cryoconite hole typically rang...

Sensing from the ultraviolet-visible to the infrared is critical for a variety of industrial and scientific applications. Photodetectors with broad spectral response, from 300 nm to 1,100 nm, were fabricated using a narrow-band gap semiconducting polymer blended with a fullerene derivative. By using both an electron-blocking layer and a hole-blocking layer, the polymer photodetectors, operating...

In this paper, we report a design of high sensitivity Photonic Crystal Fiber (PCF) sensor with high birefringence and low confinement losses for liquid analyte sensing applications. The proposed PCF structures are designed with supplementary elliptical air holes in the core region vertically-shaped V-PCF and horizontally-shaped H-PCF. The full vectorial Finite Element Method (FEM) simulations p...

Initially poorly conducting PbSe nanocrystal solids (quantum dot arrays or superlattices) can be chemically "activated" to fabricate n- and p-channel field effect transistors with electron and hole mobilities of 0.9 and 0.2 square centimeters per volt-second, respectively; with current modulations of about 10(3) to 10(4); and with current density approaching 3 x 10(4) amperes per square centime...

Bulk unrelaxed InAsSb alloys with Sb compositions up to 44% and layer thicknesses up to 3 um were grown by molecular beam epitaxy. The alloys showed photoluminescence (PL) energies as low as 0.12 eV at T=13K. The electroluminescence and quantum efficiency data demonstrated with unoptimized barrier heterostructures at T=80 and 150K suggested large absorption coefficient and carrier lifetimes suf...