In this paper we summarize the results [1] on the development of high power 1300 nm ridge waveguide Fabry-Perot and distributed-feedback (DFB) lasers. Improved performance of MOCVD grown InGaAsP/InP laser structures and optimization of the ridge waveguide design allowed us to achieve more than 800 mW output power from 1300 nm single mode Fabry-Perot lasers. Despite the fact that the beam aspect...

In this work, the effects of the types of frother (MIBC, pine oil, and A65) and operational parameters (impeller speed and air flow rate) on the flotation of quartz coarse particles was investigated using nano bubbles (NBs). Quartz particles of the size of -425+106 mm and three types of frother were used for the flotation experiments. Also the impeller speed was 600 to 1300 rpm, and the air flo...

This article is devoted to the description of microstructure ye'elimite, calcium aluminates and ferritic phase when iron oxide present synthesis carried out at 1300 °C for 3 h. The incorporation in ye'elimite structure (general formula: Ca4Al(6-2x)Fe2xSO16 with x = 0.00 1.13) complete < 0.12. Beyond this composition, (CaO)2(Al2O3,Fe2O3) appears as a minor which can develop two forms: needle-lik...

Abstract Single-layer hexagonal boron nitride is produced on 2 inch Pt(111)/sapphire wafers. The growth with borazine vapor deposition at process temperatures between 1000 and 1300 K in situ investigated by photoelectron yield measurements. kinetics slower higher follows a tanh law which better fits for temperatures. crystal-quality of ( h -BN)/Pt(111) inferred from scanning low energy electron...

The purpose of this paper is to present a method for translating the problem of finding all maximal subgroups of finite groups into questions concerning groups that are nearly simple. (A finite group is called nearly simple if it has only one minimal normal subgroup and that it nonabelian and simple.) In view of the recently announced classification of all finite simple groups this seems to be ...

The phrase 'global land grab' has become a catch-all framework to describe and analyze the current explosion of (trans)national commercial land transactions related to the production and sale of food and biofuels. Initially deployed and popularised by activist groups opposed to such transactions from an environmental and agrarian justice perspectives, the significance of the phrase has quickly ...

The concept of below-threshold and above-threshold current injection efficiency of quantum well sQWd lasers is clarified. The analysis presented here is applied to the current injection efficiency of 1200 nm emitting InGaAs and 1300 nm emitting InGaAsN QW lasers. The role of heavy-hole leakage in the InGaAsN QW lasers is shown to be significant in determining the device temperature sensitivity....