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SINTESIS NANOPARTIKEL SERAT RAMI DENGAN METODE ULTRASONIKASI UNTUK APLIKASI FILLER BIONANOKOMPOSIT Kurniawan, D
Jurnal Biofisika Vol 8, No 2 (2012): Jurnal Biofisika
Publisher : Jurnal Biofisika

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Abstract

Synthesis  of  nanoparticles  was  obtained  from  the  hemp  fiber  ultrasonic  method. Nanoparticles hemp fiber is used as  bio-nanocoomposite Ultrasonic method of hemp fiber was done with  the time variations  of surfactant tween 80 3  % as many as 10 samples and 0 % as much as 3 samples. All samples were tested with the Particle Size Analyzer (PSA) to determine the size distribution. The smallest sized fiber  was obtained from 105 min sonication with 3 % tween 80, the size is  229.04  nm.  Hemp fiber  size  with  concentration  of  tween  80  3  %  smaller  than  the  concentration  of Tween 80 0 %. Hemp fibers with nanometer-  size 229.04 has a density of 1.1727 g cm -  3 is smaller than 7500 nanometers in size hemp fibers with a density of 1.7083 g cm -  3 . Results of X -  ray Diffraction ( XRD ) showed the smallest size hemp fiber hemp is a cellulose fiber , characterized by their crystal phase cellulose is at 22.76 degrees diffraction angle with the degree of crystallinity 21.3727 %
TEACHER’S BELIEFS ON USING CODE SWITCHING IN RELATION TO BUILDING STUDENTS’ SOCIAL EMOTIONAL COMPETENCE Suganda, L A; Petrus, I; Zuraida, Zuraida; Kurniawan, D; Mardiana, Mardiana
Sriwijaya University Learning and Education International Conference Vol 3, No 1 (2018): 3rd-SULE-IC
Publisher : Sriwijaya University Learning and Education International Conference

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Abstract

This study investigated the phenomenon of code switching or the use of English and Indonesian as a medium of instruction used by the English as a Foreign Language teacher in her classroom discourse. It was conducted in a seventh grade English class at one secondary school in South Sumatera, Indonesia. This case study focuses on revealing the teacher’ perceptions towards her use of code switching in relation to build her students’ social emotional competence. The teaching and learning processes in the classroom were recorded and transcribed to explore the occurrence of code switching in the classroom discourse. A face to face semi-structured interview with the teacher was held and analysed to see her perception and purposes of doing code switching in the class. The study results indicated that the switching between English and Indonesian in the EFL classrooms plays a positive role in building the students social emotional competence during the teaching and learning process. The main reason the teacher uses code switching is to have a better communication with her students while transferring the material or topic of discussion as well as to remind and motivate them to have higher social emotional competence in their English learning process.