Browsing by Author "Susilawati"

Now showing 1 - 6 of 6
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    ANALYSIS OF NON POLAR FRACTION FROM MAHKOTA DEWA (Phaleria macrocarpa (Scheff.) Boerl.) FRUIT WITH GAS CHROMATOGRAPHY-MASS SPECTROSCOPY
    (2014-03-27) Susilawati; Matsjeh, Sabirin; Pranowo, Harno Dwi; Anwar, Chairil
    Analysis of n-hexane fraction from mahkota dewa fruit had been carried out by using GC-MS. The result of GC separation revealed that n-hexane fraction contains 27 component but only 8 component were identified. Based on the GC-MS library prediction, compounds from peak 2, 3, 6, 7, 8, 20, 22 and 25 respectively were analysed as styrene (1), furan, tetrahydro-2,2-dimethyl (2), phenol, 2-methoxy-4-(2-propenyl)- eugenol (3), 2-propanoic acid 3-phenyl methyl ester (methyl cinnamic) (4), benzene 1,2-dimethoxy-propenyl 4-2 metileugenol (5), hexadecanoic acid methyl ester (methyl palmitic) (6) methyldihydromalvalic (7) tetracosanoic acid, methyl ester (8). Unfortunately another peak unidentified. Analysis fragmentation were carried out for the 3 compounds that have been successfully identified.
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    ISOLASI DAN IDENTIFIKASI SENYAWA STEROID DARI DAUN RIMBANG (SOLANUM TORVUM)
    (2014-03-27) Susilawati; Nasution, Hafni Indriati; Limra, Widya
    Chemical constituent has been isolated from the dry aerial parts of rimbang (Solanum torvum). The finely chopped material was extracted with methanol then fractionated into different polarity of solvent ; hexane, and ethil acetate. Separated done with colom chromatography at silica gel-60 by step gradien polarity. 345,96 mg of colourless needles (Melting point 144-1460Celcius) has been isolated from hexane fraction. Based on Liberman Burchard and Roseinhein reagen, spectrum ultraviolet and spectrum infra red, it was identified as steroid that have double bonding conjugation and -OH function
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    ISOLASI DAN IDENTIFIKASI STEROID DARI TUMBUHAN PILADANG HITAM (COLEUS SCUTELLAROIDES (L). BENTH)
    (2014-03-27) Susilawati; Islamias; Zulfiasni
    Telah diisolasi konstituen utama dari piladang hitam (Coleus Scutellarioides (L) Benth). Sampel yang telah dikering anginkan dipotong kecil diekstrak dengan metanol kemudian difraksinasi dengan pelarut dengan kepolaran berbeda, heksan dan etil asetat. Pemisahan dilakukan dengan kromatografi kolom pada silika gel– 60 dengan metode SGP. Kristal tak berwarna (titik leleh = 157-159,50C) telah diisolasi dari fraksi etil asetat dan berdasarkan reagen Liberman Burchard, spektrum ultraviolet diidentifikasi sebagai steroid yang mempunyai ikatan rangkap tidak terkonjugasi
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    KARAKTERISASI BAHAN FEROELEKTRIK STRONTIUM TITANAT (SrTiO3) DENGAN MENGGUNAKAN X- RAY DIFFRACTION
    (2013-03-05) Susilawati; Dewi, Rahmi; Krisman
    Ferroelectric material Strontium Carbonate (SrCO3) has been made with the comparison of 1:1 from chemical reaction of Titanium Dioxide (TiO2). The pellet was anneled with the temperature of 700oC and then characterized using XRD. The XRD result of SrTiO3 after anneling showed some peaks, the positions of the peaks on 2θ are 23.32°, 32.72°, 40.00o, 47.07o, 52.40°, 57.80o. After anneling, the peaks become wider, this mean the samples become crystaline in structure. From the “a” value calculation “a” mean value obtained is 3,86 Å. Once the value of a calculated and a reference value obtained percentage error can be calculated that is 1.15%
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    PEMBENTUKAN POLINOMIAL ORTOGONAL MENGGUNAKAN PERSAMAAN INTEGRAL NONLINEAR
    (2016-02-04) Susilawati
    This article discusses how to construct a polynomial orthogonal with a certain weight function using a nonlinear integral equation. Discussions focus on the determination of the coefficients of the polynomial, so that a formed polynomial is orthogonal.
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    Penerapan Model Pembelajaran Kooperatif Pendekatan Struktural Numbered Heads Together (Nht) Untuk Meningkatkan Hasil Belajar Matematika Peserta Didik Kelas X2 Sman 2 Tambang
    (2013-01-22) Susilawati
    PENERAPAN MODEL PEMBELAJARAN KOOPERATIF PENDEKATAN STRUKTURAL NUMBERED HEADS TOGETHER (NHT) UNTUK MENINGKATKAN HASIL BELAJAR MATEMATIKA PESERTA DIDIK KELAS X2 SMAN 2 TAMBANG Susilawati1 Sakur2 Syarifah Nur Siregar2 Susilawati.matematika08@gmail.com ABSTRACT This research aimed at improving achievement in teaching and learning process at class X2 of SMAN 2 Tambang on peculiar semester 2012/2013 by implementing cooperative learning model of numbered heads together in mathematics lesson. This research is classroom action research. It was conducted in two cycles. The activity and achievement data were gained by collecting activity data by using observation sheet and daily test. The data which collected were score which descriptive analyzed statistic. The achievement in the first cycle found that the percentage of students who achieve KKM is 71,88% and the second cycle is 81,25% an increase from before the measures the percentage is only 12,5%. The conclusing of the study showed that the implementing of cooperative learning model for numbered heads together structural could improving achievement mathematic.