Nurul Istiana, Nurul
Physics of Universitas Negeri Semarang, Indonesia

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ETHANOL PRODUCTION FROM FERMENTATION OF ARUM MANIS MANGO SEEDS (MANGIFERA INDICA L.) USING Saccharomyces Crevisiaea Masturi, Masturi; cristina, amelia; Istiana, Nurul; Sunarno, Sunarno; Dwijananti, Pratiwi
Jurnal Bahan Alam Terbarukan Vol 6, No 1 (2017): June 2017 [Nationally Accredited]
Publisher : Semarang State University

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Abstract

The increase of energy needs coupled with the decline in fossil fuel production, requires other sources of energy to meet those needs. One of the solution is using renewable energy. Bioethanol is one of the alternatives to the fossil fuel. This study was aimed at determining the exact mass of mango seeds in producing high grade bioethanol. Bioethanol was produced by fermentation of arum manis mango fruit seed using bakers yeast, Sacczharomyces cerevisiae.  The arum manis mango seeds were known to contain carbohydrate contents of 19.53%. The study was conducted by using different mass of mango seeds 25, 35 and 45 g resectively. The study showed that the samples of 25, 35 and 45 g produce ethanol with concentration of 4.78, 6.64 and 1.48%. These results indicated that the mass of 35 g mango seeds produced highest ethanol content.
PENERAPAN MODEL PEMBELAJARAN KOOPERATIF STAD UNTUK MENINGKATKAN PENGUASAAN KONSEP DAN KETERAMPILAN PROSES BELAJAR FISIKA SISWA SMP KELAS VIII Istiana, Nurul; Sarwi, Sarwi; Masturi, Masturi
UPEJ Unnes Physics Education Journal Vol 5 No 1 (2016)
Publisher : UPEJ Unnes Physics Education Journal

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Abstract

Penelitian ini bertujuan untuk menentukan pengaruh penerapan model pembelajaran kooperatif STAD terhadap penguasaan konsep dan keterampilan proses belajar fisika siswa pada sub pokok bahasan getaran dan gelombang. Subjek penelitian adalah kelas VIII B SMP Negeri 2 Ambarawa. Teknik pengumpulan data menggunakan teknik tes, observasi dan dokumentasi. Analisis data menggunakan uji deskriptif presentase, uji gain dan uji t. Hasil penelitian menunjukkan bahwa ketuntasan belajar klasikal siswa sebesar 86,11% dengan kriteria tinggi. Data pre-test dan post-test dianalisis menggunakan Chi Kuadrat dan dinyatakan berdistribusi normal. Peningkatan penguasaan konsep ditunjukkan dengan <g>= 0,6 dan kriteria sedang. Hasil analisis uji t menyebutkan thitung = 7,477; ttabel= 1,697; thitung > ttabel sehingga Ho ditolak dan Ha diterima. Kelima aspek keterampilan proses belajar fisika siswa dianalisis menggunakan uji deskriptif dan dinyatakan meningkat secara signifikan. Dapat disimpulkan bahwa model pembelajaran kooperatif STAD dapat meningkatan penguasaan konsep dan mengembangkan keterampilan proses belajar fisika siswa SMP kelas VIII pada sub pokok bahasan getaran dan gelombang. This study aims to determine the influence of application cooperative learning type STAD to mastery concept and skills process of physics in sub material vibrations and waves. The subject of research is all students in VIII B SMP Negeri 2 Ambarawa. Collection of data using a technique tests, observations and documentation. Data analysis using a percentage descriptive test, gain test, and t-test. The result of research shows that exhaustiveness studying classical student at 86,11% with high criteria. Pre-test and post-test data were analysis using Chi Kuadrat and conclude as normal distribution. Enhancement of mastery concept shows with <g>= 0,6 and middle criteria. T-test analysis result shows tcount = 7,477; ttable = 1,697; tcount > ttable   so Ho rejected and Ha received. Five aspects of skills learning process of physics students are analyzed using descriptive test and shows increase as significant. The conclusion is cooperative learning model of STAD can increase the mastery concept and develop the skills learning process of physics students class VIII SMP in sub material vibrations and waves.