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PENENTUAN KALOR DARI CAMPURAN ARANG TEMPURUNG KELAPA DENGAN CANGKANG KELAPA SAWIT DI TINJAU DARI PERBANDINGAN CAMPURANNYA Doni Pandra; Sugianto '; Maksi Ginting
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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A research has been carried to determine the calory value of the mixture of coconut charcoal and palm oil shells using an experimental method. This experiment used a bomb callorimeter to measure the physical parameters of the sample (callory value, sulfur total, total ash and total moisture of content). Each sample was treated by the same pressure and volume. The samples were taken from two different materials, namely charcoal of coconut shells and oil palm shells. Four different samples were made from combination of grain size ratio of 60 : 40 and 40 : 60. The sample A and C were mixture of coconut shell charcoal and charcoal oil palm shells with 60: 40 ratio, while the sample B and D were mixture of coconut shell Charcoal and charcoal oil palm shells for 40: 60 ratio. Results of the test showed the value of the physical parameters i.e callory value, sulfur total, total ash and total moisture of content respectively for the sample A were 6.379 calories cal/g, 0.18%, 1.43%, and 8.00%, for the sample B were 5.732 calories cal/g, 0.22%, 1.30% and 8,48 %, for the sample C were 5.787 cal/g, 0.20%, 10,91%, and 7.19%, and for the sample D were 5.395 calories cal/g, 0.20%, 11.24%, and 7,07%. The sample A had larger grain density so that the grain samples were more solid. The denser of the material was the higher the value of the heat from the charcoal. From the overall data obtained, it was indicated that the sample A had the highest quality value compared to the other samples.

PENGUKURAN NILAI PANJANG KOHERENSI DUA SUMBER LASER MENGGUNAKAN INTERFEROMETER MICHELSON Dhiesta Anggrainie; Minarni '; Tengku Emrinaldi
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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One of the laser beam unique properties is its coherence. Each lasers has different coherence length. The coherence length of laser is very important in many photonic applications such as holography, spectroscopy, and interferometry. The coherence length can be measured by an interferometer. Measurement of coherence length of two HeNe lasers and two diode lasers has been done using a Michelson interferometer. Two HeNe lasers with same wavelength but from the different company and two diode lasers with different wavelength and brands were used. The laser used were HeNe laser 632,8 nm by Griffin (laser I), HeNe laser 632,8 nm by Pudak (laser II), diode laser 638 nm(laser III) and diode laser 405 nm (laser IV). Interference fringes from interferometer were recorded by a Thorlabs CCD camera and processed using ToupView software to determine the respective value of the maximum and minimum intensity of each fringe pattern. Data of the fringe pattern intensity were used to calculate the visibility (V) and coherence length (Lc) of the lasers. The results showed that Lc and deviation of laser I was (1,12±31,8× 10−3) mm, laser II was (0,99±61,6× 10−3) mm, laser III was(0,50±2,9× 10−3) mm and laser IV was (0,3 8±4,8× 10−3) mm, respectively . The results also showed that the coherence lengths of the HeNe lasers were greater than the diode lasers.

APLIKASI MULSA Imperata cylindrica (L.), Mucuna bracteata DC. DAN KOMPOS PELEPAH KELAPA SAWIT (Elaeis guineensis Jacq.), TERHADAP PERKECAMBAHAN DAN PERTUMBUHAN Mikania micrantha H.B.K. Malinda, Sari; Fatonah, Siti; ', Herman
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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The research on the use of mulch of Imperata cylindrica, Mucuna bracteata, and palm midrib compost on the germination and growth of Mikania micrantha had been conducted at the Laboratory of Biology and Botany Gardens, Department of Biology, Faculty of Mathematics and Natural Sciences, University of Riau from September to November 2013. The purpose of this study was to determine the effect of mulch thickness of I. cylindrica, M. bracteata and palm midrib compost on the germination and growth of M. micrantha, using randomized block design, with seven treatments (M0, M1, M2, M3, M4, M5, and M6). Each treatment had seven replicates with two different thickness of mulch, i.e. 2,5 and 5 cm. The results showed that mulch of I. cylindrica, M. bracteata and palm midrib compost affected the germination and growth of weeds M. micrantha. Mulching with 2,5 cm thickness could inhibit the germination and growth of weed M. micrantha up to 100 %.

ANALISA KOEFISIEN ABSORPSI BUNYI MATERIAL SERAT BATANG KELAPA SAWIT DENGAN GYPSUM MENGGUNAKAN SONIC WAVE ANALYZER Qory Gunanda; Riad Syech; Muhammad Edisar
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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A research has been done in analyzing a coefficient absorption of composite material of oil palm trunk fiber and gypsum using a sonic wave analyzer (SOWAN) and carried out using sound wave of 150 Hz frequency. Sample was formed as a cylinder made from gypsum with 3:5 ratio of water and gypsum, formed a pipe with 7,5 cm outer diameter and heights of 2 cm, 3 cm, 4 cm, 5 cm, and 6 cm (sample thickness). The pipe with the outer diameter of 6 cm was used for making a cavity in the samples and then the composed of oil palm trunk fiber of ± 1 cm length with the variation percentage of fiber of 12,24%, 24,48%, 36,73%, and 48,97% filled in to each sample. Ao (initial amplitude) and A (final amplitude) then were measured by Sonic Wave Analyzer (SOWAN) with the intensity of 65 dB, 70 dB, 75 dB, dan 80 dB. Results of the measurements showed that the bigger percentation of fiber, the higher coefficient of sound absorption andthicker sample produced bigger the coefficient of sound absorption. The biggest absorption coefficient was 0,4957, due to the sample with 6 cm thickness when the intensity was 80 dB and the smallest absorption coefficient was 0,3088, of the sample with 2 cm thickness when the intensity was 65 dB. The maximum absorptioncoefficients of the sample thickness of 2 cm, 3 cm, 4 cm, and 5 cm were 0,3557, 0,3779,0,4155, and 0,4863, respectively. This showed that preparing the sample by method ofarranging the oil palm stem's fiber inside the sample was more effective to absorb the sound for low frequencies (150Hz) if viewed from the standard of absorption coefficientof gypsum was 0.29 for frequency of 150 Hz. Based on the results of this study the absorption coefficients exceed the minimum limit 0.15 as suggested ISO 11654 as a silencer.

ISOLASI DAN KARAKTERISASI BAKTERI PROBIOTIK PADA SALURAN PENCERNAAN IKAN LAIS (Kryptopterus spp.) Mustaqim '; Rodesia M Roza; Bernadeta Leni F
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Riau is one of provinces that has high diversity of lais fish. Lais fish is one of income sources for Riau community. Probiotics are "good" bacteria that are uninteutionally consumed alive until they reach an intestinal tract. Probiotics can also produce bacteriocins that have been known usefull against pathogens that are specific to some pathogen strains. The aims of this study were to isolate and characterize the probiotic bacteria found in the digestive tract of lais fish (Kryptopterus spp.). This study was conducted from November 2013 to January 2014 at the Microbiology Laboratory, Biology Departement University of Riau, Pekanbaru. The results of this study obtained 16 isolates of probiotic bacteria with all of the isolates belong to gram-positive bacteria with rod and circular shape. All of the isolates were non-motile, negative catalase, positive oksidase, the metil red test showed negative and positive result and the fisiological test showed that all of isolates were able to grow at the temperature of 25-37oC. All of the characterized isolates were grouped into Lactobacillus genus.

SKRINING 9 JENIS TUMBUHAN ORDO SAPINDALES DI TAMAN HUTAN RAYA (TAHURA) SULTAN SYARIF HASYIM RIAU YANG BERPOTENSI SEBAGAI TUMBUHAN TERAPEUTIK Simon Mangaratua; Fitmawati '; Nery Sofiyanti
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
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Sultan Syarif Hasyim (SSH) Forest Park is one of the conservation areas in Riau Province. A total of 125 Spermatophyta species have been previously identified in thisregion. Those species are potencially used as therapeutic agens, especially Sapindales species. This study aimed to identify the Sapindales species from SSH forest park thathas therapeutic potencies based on their phytochemical test (alkaloids, flavonoids, steroids, terpenoids, saponins, and tannins). This study had been carried out fromNovember 2013 to February 2014. The sampling method used in this study was an exploration method. Data was descriptively analyzed. The result showed that total of nine Sapindales species from four families were identified. The number of species that positively contained alkaloids, flavonoids, steroids, terpenoids, saponins, and tannins were 7, 3, 6, 2,6 and 4, respectively.

SELEKSI ISOLAT JAMUR DALAM MENGHASILKAN HORMON IAA (Indole Acetic Acid) ASAL TANAH GAMBUT DESA RIMBO PANJANG KABUPATEN KAMPAR Astriani, Fenny; Fibriarti, Bernadeta Leni; Zul, Delita
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
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Indole Acetic Acid (IAA) is one of group of auxin phytohormones and plays a role to improve plant growth. Beside plants, fungi are also known to be able to produce IAA.This study aimed to select the ability of fungal isolates collection of Microbiology Laboratory, Faculty of Math and Natural Sciences University of Riau in IAA production. Fungal isolates were cultured in medium PDB (Potato Dextrosa Broth)enriched by tryptophan as a precursor of IAA. Indole acetic acid produced by fungi was detected by adding Salkowski reagent and determined quantitatively by the use of colorimetric method. The results showed that 47 fungal isolates were able to produce IAA. The highest IAA production was revealed by isolate RPL4-14 (646,75Â±0,35 ppm) and the lowest was shown by isolate RPL2-x (4,00Â±3,53 ppm) when they were culturedin PDB medium enriched by tryptophan. The fungal collection did not only produce IAA in the medium containing tryptophan, but also in the medium without tryptophan as shown by isolate RPL3-10, which has IAA concentration i.e 76,50Â±0,00 ppm and71,00Â±0,70 ppm, respectively. Isolates which produced the highest IAA concentration are identified as Penicillium sp.

PENENTUAN TINGKAT KEMATANGAN TERMAL MINYAK MENTAH ( CRUDE OIL ) DARI LADANG MINYAK LIRIK Kab. INDRAGIRI HULU, RIAU Cindya Afrina; Emrizal Mahidin Tamboesai; Halida Sophia
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
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Lirik oil field is one of the oil-producing layers that is located in Indragiri Hulu Riau province, situated at ± 140 km South of the city of Pekanbaru with the area of ± 12 km2. There is no researchon Lirik oil fields, at on the maturity level of petroleum using the methylphenantrene index parameters on oil wells, therefore this study aimed to determine the level of thermal maturity of Lirik oil. Determination of thermal maturity was done by taking two samples from two different wells of Lirik oil field, Riau. In this study the thermal maturity determination was done using two parameters, the parameters of isoprenoid and n-alkanes in saturated fractions and characterized using gas chromatography (GC-FID), this parameter was the initial parameter in the determination of thermal maturity. Determination of the level of thermal maturity of petroleum enhanced with Metilphenantrene index parameter on aromat fractions were characterized using gas chromatography -mass spectroscopy (GC-MS). Determination of thermal maturity level using the parameter index was determined by looking at the value Metilphenantren MPI-3 and MPR (Methylphenantrene ratio). The results of the determination of thermal maturity at saturated fraction using the ratio of n-alkanes and isoprenoid indicated that oil from Lirik oil wells, Riau was already ripen. This was confirmed by the parameters that have Metilphenantrene index values ranged MPI-3 0709; MPR 0755 and 0699 ranges; 0.756. The values of these parameters Metilphenantren index showed that crude oil from two wells Lirik, Riau has a low maturity level.

ANALISIS HUBUNGAN KEKERABATAN JAMBU AIR (Syzigium aqueum (Burm.f.). Alston) DI KOTA PEKANBARU DAN KABUPATEN KAMPAR BERDASARKAN KARAKTER MORFOLOGI Nanda Marlian Iriani; Nery Sofiyanti; Fitmawati '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Water apple is one of agricultural commodities in Indonesia, including Riau Province. In this Province, this species is mainly distributed in Pekanbaru and Kampar. The diversity of water apple in both regions is high, however, there is no record of its morphological diversity study. This study aimed to identify and to know the diversity of water apple from Pekanbaru and Kampar based on the morphological characters. This research had been carried out from April 2013 to January 2014 using survey and observation methods. The morphological characters were observed and described. The scoring of morphological characters was then analyzed using NTSYS-pc 2.02i. The numbers of variation found in tree, leaf, flower, fruit and seed were 4, 5, 7, 9 and 3 respectively. The similarity coefficient ranged from 0.16 to 0.77. The highest similarity was found on individual R8 and R7, while the lowest similarity coefficient was found on individual KM10 and BR8. Result of cluster analysis showed that the relationship of water apples ranged from 0.41 to 0.78.

KARAKTERISASI BAHAN FERROELEKTRIK BARIUM STRONTIUM TITANAT (Ba0.3 Sr 0.7TiO3) DENGAN MENGGUNAKAN DIFRAKSI SINAR-X (XRD) Rahmad Efendi; Rahmi Dewi; Krisman '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Ferroelectric materials of Barium Strontium Titanate (BST) with its composition of Ba0,3Sr0,7TiO3 was succesfully deposited by a solid solution method. The samples were prepared in the form of pellets and then were annealed at the temperature of 600, 700, 800oC. Characteritation of the samples was performed using X-Ray diffraction (XRD). The results of characteritation using XRD was described on a graph of the intensity vs. 2 theta. The XRD patterns of Ba0,3Sr0,7TiO3 have peaks. It was confirmed that the material of Ba0,3Sr0,7TiO3 has cubic crystalline structure, and its lattice parameter was in average of 3,961 Å. The particle sizes (D) and lattice strains (η) of the material that was annealed at temperature of 600, 700, 800°C for 1 hour were 42.60, 44.43, 46.89 nm and -4,49x 10-3, -4,05 x 10-3, -2,96 x 10-3, respectively. The increase in annealed temperature will raise the particle size and lattice strain.

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Riau

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