Papers – Page 50 – TechConnect Briefs

Electrical Nerve Agents Sensors Based on Chemically Functionalized Nanomaterials

The threat of a chemical attack continues to grow and recent examples such as the terrorist attack of the Metro of Tokyo have shown that organophosphorus agents (OPs) are powerful neurotoxic weapons. There is still [...]

In situ monitoring of temperature and voltage in lithium-ion rechargeable batteries using flexible micro two-in-one sensors

Lee C.-Y., Lee S.J., Lee C.-Y., Lee S.J., Tang M-S, Chen P-C, Chang Y-M, Yuan Ze University, TW

Under overcharge conditions, the interior temperature of polymer lithium-ion rechargeable batteries will rapidly increase. Such batteries are adopted in electric vehicles that require rapid charging and discharging, and this process causes rapid heating, raising safety [...]

MEMS Strain Sensors with High Linearity and Sensitivity with an Enhanced Strain Transfer Mechanism for Wind Turbine Blades

Moradi M., Sivoththaman S., University of Waterloo, CA

A new physical sensor design for strain measurement for wind turbine blades is presented. While the proposed sensors are highly sensitive, they are based on simple operating principle: application of an input force, which is [...]

3D Electrostatic Energy Harvester

Janicek V., Husak M., Formanek J., Jakovenko J., FEE CTU in Prague, CZ

This paper discusses the design, optimization, simulation and fabrication of 3D electrostatic MEMS energy harvester. It is one part of self-powered microsystem. It is able to work in all 3 axis which increases the efficiency. [...]

A MEMS-type Micro Sensor for Hydrogen Gas Detection

Yoon J-H, Kim B.-J., Kim J-S, Kim B.-J., Kim J-S, University of Seoul, KR

In this study, a highly sensitive hydrogen gas sensor of the multi-layer and micro-heater type was designed and fabricated using a microelectromechanical system (MEMS) process. The dimension of fabricated hydrogen gas sensor was 5 mm×4 [...]

NH3 sensing properties of centimeter scaled CVD graphene in ambient condition

Lim J., Anoop R., Kim J.H., Kim Y.J., Yoon J., Ahn H-R, Song S., Kim J.H., Kim Y.J., Jun S.C., Yonsei University, KR

The present work reports ammonia (NH3) gas sensing properties of Graphene film synthesized by chemical vapor deposition (CVD) in ambient condition. Graphene with a large area is synthesized on Cu foils by chemical vapor deposition [...]

Thermal-managed sputtered micro machined gas chromatography columns for oilfield applications

Haudebourg R., Vial J., Thiébaut D., Sassiat P., Azzouz I., Danaie K., Bourlon B., Schlumberger, FR

Since the late 70s, new approaches have been proposed to replace conventional gas chromatograph apparatus by silicon based micro fabricated separation systems. The main challenge in miniaturized gas chromatography consists in the reproducible and collective [...]

Gas sensor device based on a SnO2 nanowire network for increased sensing performances

Brunet E., Mutinati G.C., Steinhauer S., Koeck A., AIT Austrian Institute of Technology GmbH, AT

A novel gas sensor device based on a network of tin dioxide (SnO2) nanowires is presented. The high surface-to-volume ratio presented by the network of ultralong nanowires enables increased gas sensing performances in comparison to [...]

Improved Commutation Control in Switching Regulators for Battery Equalizer Applications

Mihov V., Dinkov E., Technical University of Sofia, Branch Plovdiv, BG

This paper presents an easy accessible method for improvment of performance characteristics in some switching regulators topologies, inverters and others. Some strengths and weaknesses of synchronous switching are shown. The authors propose a solution for [...]

Voltage Control Of A 3-Ø Self – Excited Induction Generators Using TSC (Thyristor Switched Capacitance)

Kumar A., Chaubey A., Infosys Limited, IN

An induction generator requires reactive power to set up and sustain magnetization and hence generates power. In grid connected induction generators this requirement is met by the grid, which unnecessarily burdens the grid and in [...]