Articles you may be interested inElectrical current leakage and open-core threading dislocations in AlGaN-based deep ultraviolet light-emitting diodes J. Appl. Phys. 116, 053104 (2014); 10.1063/1.4891830 Microstructure and origin of dislocation etch pits in GaN epilayers grown by metal organic chemical vapor deposition

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InGaN/GaN multi-quantum well (MQW) laser diodes (LDs) were grown on c-plane sapphire substrates using a multi-wafer MOCVD system. The threshold current for pulsed lasing was 1.6 A for a gain-guided laser diode with a stripe of 10 x 800 µ m 2 . The threshold current density was 20.3 kA cm -2 and the threshold voltage was 16.5 V. The optical power ratio of transverse electric mode to transverse magnetic mode was found to be greater than 50. The characteristic temperature measured from the plot of threshold current versus measurement temperature was between 130 and 150K.

We have grown ZnCdSe/ZnSSe/ZnMgSSe separate confinement heterostructures by molecular-beam epitaxy. Strain on the ZnSSe layer is calculated from x-ray and photoluminescence data. The temperature dependence of band-gap energy and the photoluminescence intensity in the Cl-doped ZnCdSe active layers is compared with that of undoped ones.

IMO independent type B LNG tanks are designed using model tests, refined analytical tools and analysis methods to determine stress levels, fatigue life and crack propagation characteristics. Currently the tank design is performed based on the mechanical properties of the tank materials at room temperature. However it is notable that the materials used for the tanks show enhanced yield and tensile strength at low temperature and this design advantage can be taken into account when giving further consideration to fatigue fracture and crack propagation characteristics. In this study, the application of cryogenic design criteria to an SPB (Self-supporting Prismatic IMO type B) LNG tank made of SUS304(Mod) is presented. The material properties of SUS304(Mod) have been obtained from a series of tensile, fatigue and crack growth rate tests at 25°C, −100°C and −163°C. A design temperature that takes account of the cryogenic operating environment is proposed and the estimation of the weight reduction compared to a room temperature design is also described.