Capacitive Micro-machined Ultrasonic Transducers (CMUTs) are the ultrasonic devices which produce better features in contrast to piezoelectric transducers. The intrinsic parameter of CMUT varies with the variation in geometrical dimension of the device. The cavity height and the radius of the CMUT with circular membrane is varied in the lumped parallel plate model for its impact on the paramete...

Optically pumped green lasing with an ultra low threshold has been achieved using an InGaN/GaN based micro-disk with an undercut structure on silicon substrates. The micro-disks with a diameter of around 1 μm were fabricated by means of a combination of a cost-effective silica micro-sphere approach, dry-etching and subsequent chemical etching. The combination of these techniques both minimises ...

Development in China SHI Lei*, XING Lu*, BI Jun*, ZHANG Bin* *) State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University; Center for Environmental Management and Policy, Nanjing University and Jiangsu Environmental Production Department, Nanjing 210093, P. R. China ABSTRACT Circular economy is a theory which advocates developing economy on the basi...

• Circular economy is viewed as central to reduce plastic pollution. Link between circular and micro(nano)plastic contamination seldom made. Some recycling can lead increased with micro(nano)plastics. Extended producer responsibility be important for sustainable production. the most promising path a more use of plastic. It aims at reducing consumption resources by keeping materials within value...

Several researches dealing with the single-phase forced convection heat transfer inside micro channels have been published in the past decades. The performance of liquid flow has been proved that agree with the conventional correlations very well (Yang and Lin [2007]). However, owing to the low heat transfer coefficient of gaseous flow, it is more difficult to eliminate the effects of thermal s...

We demonstrate an ultra-sensitive sensor realized in high quality circular semiconductor micro-cavities employing radial Bragg reflectors. Resolution enhancement by a factor of ten, compared to conventional ring resonators, is demonstrated experimentally. ©2005 Optical Society of America OCIS codes: 230.5750 Resonators; 280.3420 Laser sensors

resonator model For modeling purposes, the MR is decomposed into two bent-straight waveguide couplers, represented by the blocks (I) and (II), which are connected to each other by two segments of the cavity. The external connections are provided by straight waveguides. Here we consider only forward propagating modes of uniform polarization. We assume that all elements are linear and that the ba...