An Analysis of Students' Errors in Pronouncing English Diphthongs at the First Semester of Stain Jurai Siwo Metro

The objectives of this research are to find out total errors of the student when they pronouncing English word containing diphthongs, to find out what type of diphthongs that students made the most frequently mispronounced, to find out what type of diphthongs that students made the least frequently mispronounced, and to find out the factors influencing error pronunciation that the student made in English word containing diphthongs.In this research the writer used qualitative method. The subjects of this research were 40 of the First Semester students at STAIN Jurai Siwo Metro in academic year 2015/2016. The instrument of this research was a pronunciation test of the English word containing 9 types of English diphthongs, and voice recorder to record the students' pronounciation.The data of this research were collected by giving the English pronunciation test. The collected data were identified, classified, analyzed and interpreted.. The results of the analysis showed that the students made  errors out of the total 499 words. The types of diphthongs that the students the most frequently mispronounced are [oʊ] (62 words), [aʊ] (61 words), [ʊə] (59 words), [ɔə] (59 words), and [ɛə] ( 58 words),.The type of diphthongs that the students the least frequently mispronounced is [aɪ] (46 word).The factors influencing error pronunciation that the students made are the habit of students in pronouncing the word that contains of diphthongs and the students pronounced the word as it was written in the orthographic writing

Off-lattice Kinetic Monte Carlo simulations of strained heteroepitaxial growth

An off-lattice, continuous space Kinetic Monte Carlo (KMC) algorithm is discussed and applied in the investigation of strained heteroepitaxial crystal growth. As a starting point, we study a simplifying (1+1)-dimensional situation with inter-atomic interactions given by simple pair-potentials. The model exhibits the appearance of strain-induced misfit dislocations at a characteristic film thickness. In our simulations we observe a power law dependence of this critical thickness on the lattice misfit, which is in agreement with experimental results for semiconductor compounds. We furthermore investigate the emergence of strain induced multilayer islands or "Dots" upon an adsorbate wetting layer in the so-called Stranski-Krastanov (SK) growth mode. At a characteristic kinetic film thickness, a transition from monolayer to multilayer islands occurs. We discuss the microscopic causes of the SK-transition and its dependence on the model parameters, i.e. lattice misfit, growth rate, and substrate temperature.Comment: 17 pages, 6 figures Invited talk presented at the MFO Workshop "Multiscale modeling in epitaxial growth" (Oberwolfach, Jan. 2004). Proceedings to be published in "International Series in Numerical Mathematics" (Birkhaeuser