Syarfi, Syarfi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Pembuatan Biodiesel Dari Minyak Biji Karet Menggunakan Reaktor Membran Fauzi, Subehan; Syarfi, Syarfi; Bahruddin, Bahruddin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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One of the challenges in biodiesel manufacturing were the limited conventional mass transfer. The problem can be solved by using new technology in the biodiesel manufacturing process, namely tmembrane reactor. Membrane reactor has a close relationship to productivity and selectivity. This research aims to study the effect of variations in the molar ratio and transmembrane pressure on the characteristics and productivity of biodiesel. This research was conducted by two stages of preparation of rubber seed oil and biodiesel production using a membrane reactor. Rubber seed oil preparation process consists of stripping, drying, resizing, extraction and degumming. Biodiesel production is conducted by using H2SO4 catalyst, reaction time 6 h, reaction temperature 60°C, the variation of the molar ratio of 1:15, 1:20 and 1:25 and transmembrane pressure of 1 bar, 1.5 bar and 2 bar. Results of preparation of rubber seed oil yield of 19% was obtained with a free fatty acid content before and after degumming is 37.6% and 29.12%. The results showed the highest yield of biodiesel production amounted to 62.15% at a molar ratio of 1:20 and a transmembrane pressure of 1.5 bar. Biodiesel produced has a density of 0.880 g/ml, viscosity 7.73 mm2/s and flash point 180oC. The largest composition of biodiesel ie 26.5% of Oleic Acid Methyl Ester.Keywords: biodiesel, membrane reactor, rubber seed oil
THE CORRELATION BETWEEN THE VOCABULARY MASTERY AND READING COMPREHENSION’S ABILITY OF THE FIFTH SEMESTER STUDENTS OF ENGLISH STUDY PROGRAM FKIP UNIVERSITAS RIAU Alfahri, Roby; Dahnilsyah, Dahnilsyah; Syarfi, Syarfi
Jurnal Online Mahasiswa (JOM) Bidang Keguruan dan Ilmu Pendidikan VOL 6 : EDISI 1 JANUARI-JUNI 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Keguruan dan Ilmu Pendidikan

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Abstract: This correlational research is aimed to find out whether there is a correlation between vocabulary mastery and reading comprehension’s ability of the fifth semester students of English Study Program FKIP-UR. The sample was 28 students selected through cluster random sampling. The instruments used in this research were the vocabulary and reading TOEFL test items. The research finding revealed that the vocabulary mastery test result of the fifth semester students of English Study Program FKIP-UR was at the good level (75), and their reading comprehension’s ability was at good level (69) also. Based on Pearson correlation analysis, it was obtained that the correlation coefficient between the students’ vocabulary mastery and reading comprehension’s ability was 0.876 with the sig. value=0.00. Hence, it could be concluded that there was a very high correlation between the vocabulary mastery and reading comprehension’s ability of the fifth semester students of English Study Program FKIP-UR. As a consequence, the null hypothesis was rejected and alternative hypothesis was accepted.Key Words: Correlation, Vocabulary Mastery, Reading Comprehension’s Ability