Growth and Characterization of GaN on Sapphire and Porous SWCNT Using Single Molecular Precursor

on the relationship between using discourse markers and the quality of expository and argumentative academic writing of iranian english majors

the aim of the present study was to investigate the frequency and the type of discourse markers used in the argumentative and expository writings of iranian efl learners and the differences between these text features in the two essay genres. the study also aimed at examining the influence of the use of discourse markers on the participants’ writing quality. to this end the discourse markers us...

Ion-assisted nucleation and growth of GaN on sapphire„0001..

We have performed a real-time x-ray scattering study of the nucleation of GaN on sapphire~0001! by gas-source molecular-beam epitaxy. GaN growth using thermal ammonia and Ga~C2H5!3 exhibited a rapidly decaying intensity at the 0001 reflection, characteristic of three-dimensional cluster growth. Growth with 30-eV NHx 1 ions and Ga~C2H5!3 exhibited layer-by-layer intensity oscillations with maxim...

Growth of GaN on porous SiC by molecular beam epitaxy

single-step synthesis of multi-component spirobarbiturates using ionic liquids and synthesis of substituted pyridine filled with catalysts supported on solid substrate

in this thesis, a better reaction conditions for the synthesis of spirobarbiturates catalyzed by task-specific ionic liquid (2-hydroxy-n-(2-hydroxyethyl)-n,n-dimethylethanaminium formate), calcium hypochlorite ca(ocl)2 or n-bromosuccinimide (nbs) in the presence of water at room temperature by ultrasonic technique is provided. the design and synthesis of spirocycles is a challenging task becaus...

preparation and characterization of new co-fe and fe-mn nano catalysts using resol phenolic resin and response surface methodology study for fischer-tropsch synthesis

کاتالیزورهای co-fe-resol/sio2و fe-mn-resol/sio2 با استفاده از روش ساده و ارزان قیمت همرسوبی تهیه شدند. از رزین پلیمری resol در فرآیند تهیه کاتالیزور استفاده شد.