Ring modulators for silicon photonic (SiPho) optical transceivers are extremely thermally sensitive and require thermal tuning stable operation. This is achieved with integrated heaters in this work two aspects of the investigated: firstly, how to model heater-waveguide system a SiPho ring modulator. Secondly, improve energy efficiency by adapting design order minimize power consumed heater. Si...

Abstract This research studies the influence of local weld notch parameters on fatigue crack initiation sites in laser-hybrid butt welds, utilizing high-resolution 3D scans and tests to failure. The suitability different geometric for strength characterization is investigated, current challenges associated with their measurements are highlighted. shapes were found fluctuate significantly, resul...

Several mechanisms have been proposed to explain prolonged epileptiform afterdischarge, elicited by various forms of stimulation in chronically isolated cerebral cortex: (1) loss of a muscarinic inhibitory mechanism 26, (2) decrease in the enzyme activity responsible for inactivating transmitter substance zl, (3) proliferation of axon collaterals 2°, (4) deafferentation of inhibitory stellate c...

A tunable transmitter featuring an SG-DBR laser is integrated with an undercut-etched, high impedance traveling-wave EAM. This device demonstrates 40 Gbps operation with >8.5 dB extinction over 25 nm tuning with 2.1 V drive. c © 2008 Optical Society of America OCIS codes: (140.3600) Tunable lasers; (230.4110) Modulators; (230.4205) MQW modulators; (230.7020) Traveling-wave devices

Abstract The present paper deals with the cases of undercut when not only linear but curved segment generatrix curve is also taken in consideration. literature admits approximation root fillet a circular arc radius 0,38 m. In this paper, instead approximation, real envelope realized by rounded rack-head computed. analyzing there are two classical synthetic geometrical models supporting Litvin’s...

The dimensional factors of the cervical undercut of the human teeth were measured. The facial and lingual undercuts showed considerable deviations in depth, width, and inclination to the crown axis and the food stream. The proximal undercuts showed a uniform depth of 1 +/- 0.3 mm with some deviations in width and inclination.

The application of mine method shallow burying and undercutting in subway tunnel engineering is becoming more significant, but also has its own limitations: the can easily cause subsidence nearby surface, there a security threat to surrounding buildings, instability inside, easy collapse construction tunnels, endangering safety, so ensuring safety becomes key project. By combining examples Heyi...