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Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam
Published by Universitas Riau
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Articles 424 Documents
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KARAKTERISTIK MORFOMETRIK DAN MERISTIK IKAN LAIS (Kryptopterus limpok, Bleeker 1852) DI SUNGAI TAPUNG DAN SUNGAI KAMPAR KIRI PROVINSI RIAU Elis Suryana; Roza Elvyra; Yusfiati '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Tapung river and Kampar Kiri river have different characteristics.Tapung river have uncontaminated ecosystem waters, while Kampar Kiri river has been already contaminated. The different condition of two rivers influence fish morphometric and meristic. The purpose of this research is to determine the difference between morphometric and meristic of male and female lais fish in Tapung river and Kampar Kiri river. The fish samples have been taken on March-May 2014. As many as 60 fish (consisting of 30 males and 30 females) were collected every month for each location. The data were analyzed using Microsoft Excel and SPSS version 16. Morphometric characters of male and female lais fish K.limpok in Tapung river have longer size than in Kampar Kiri river. The growth status of lais fish on each observation station werepositive allometric, negative allometric and isometric. T-tes showed that morphometric between male lais fish and female lais fish for each location of the research were significant different. The meristic of male and female lais fish in both rivers were not have significant different.
METODE BERTIPE NEWTON UNTUK AKAR GANDA DENGAN KONVERGENSI KUBIK Risvi Ayu Imtihana; Imran M.; Asmara Karma
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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This article discusses a Newton-type method for multiple roots, which is derived using a linear combination of Newton’s method for multiple roots and an iterative method derived based on a quadrature Gauss-type. Analytic studies show that this iterative method has a third order of convergence and for each iteration, it requires function evaluations three times, so that the efficiency index of the method is 1.44225. Furthermore, computational tests show that the method is superior to other mentioned methods, in terms of the number of iterations required to obtain the roots.
FAMILI BARU METODE ITERASI BERORDE TIGA UNTUK MENEMUKAN AKAR GANDA PERSAMAAN NONLINEAR Nurul Khoiromi; Imran M.; Supriadi Putra
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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In this article, we discuss a new family iterative method derived from a linear combi-nation of Osada’s and Euler-Chebyshev’s for multiple roots. Analytically, it is shown that the method is of order three. Furthermore, by choosing the certain values of the parameter in the new family iterative methods, several well-known methods and new iterative methods are obtained. Numerical comparisons between the proposed iterative methods and well-known methods are carried out by looking at the number of iterations and number of function evaluations.
LEMPUNG CENGAR TERAKTIVASI ASAM SULFAT SEBAGAI HASIL SAMPING PRODUKSI KOAGULAN: KARAKTERISASI Fiola Reviola; Muhdarina '; Nurhayati '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Cengar Natural clay was calcined at 700°C for 3 hours and the clay was extracted usingsulfuric acid with various of concentration (0.2, 0.4 and 0.6 moles) at 30 o C for 1 hour for liquid coagulant synthesis. The by product of liquid coagulant production was the sulfuric acid activated Cengar clay which have been used in this study. The sulfuric acid activated Cengar clay solids was heated at 230°C for 5 hours. The activated Cengar clay were characterized to determine the mineral types and ratio Si/Al. Characterization by X-ray diffraction (XRD) has shown a mineral of bassanite in clay at every moles of sulfuric acid, where as the types of clay mineral that only calcined at 700oC for 3 hours (LC700) were kaolinite, muscovite, monmorilonite, calcite and quartz. Ratio Si/Al in each of the sulfuric acid activated clays LC700-0,2, LC700-0,4 and LC700-0,6 were 7,76, 10,75 and 23,76, while non activated clay LC700 was 6,08. It is concluded that the activated clay was potential to be used as an adsorbent.
PEMBUATAN DAN KARAKTERISASI SEL SUPERKAPASITOR MENGGUNAKAN KARBON AKTIF MONOLIT DARI KAYU KARET BERDASARKAN VARIASI KONSENTRASI HNO 3 Arif, Eko Nur; Taer, Erman; Farma, Rakhmawati
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
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Abstract

Synthesis of carbon electrode from rubber wood was started by carbonizing process by adding N 2 gas at a temperature of 600 °C and continued by utilizing physical activation of CO 2 gas at 850 °C for 2 hours, and followed by a combination process of chemical activation using potassium hydroxide activator and nitric acid (HNO 3 ) with its concentration of 5%, 15% and 25%. Density of resulted electrodes was 0.407 g/cm3, 0.359 g /cm3 and 0.349 g/cm3 for each sample. X-ray diffraction analysis showed amorphous carbon electrodes in the presence of ramps at 2θ of 25.25 o and 44.21 o . The results of cyclic voltametry obtained specific capacitance of 10.444 F/g, 70.1969 F/g and 81.8234 F/g, respectively for each HNO 3 concentration. It was concluted that the addition of HNO3 to the activation proces can improve the performance of supercapacitors cell. The highest specific capacitance obtained 81.823 F/g for the 25% HNO3.
ISOLASI DNA DAN AMPLIFIKASI PCR DAERAH ITS rDNA FUNGI ENDOFIT UMBI TANAMAN DAHLIA (Dahlia variabilis) LBKURCC69 Fitri Rahayu; Saryono '; Titania Tjandrawati Nugroho
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
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Abstract

Endophytic fungi lives within healthy plant tissues without causing damage to the host plant. Endophytic fungi LBKURCC69 was one of the endophytic fungi that was isolated from the tubers of dahlia plant (Dahlia variabilis). Morphological identification showed that endophytic fungi LBKURCC69 was Phialophora fastigiata. This identification can’t provide an accurate result because many species of fungi with the same morphological features, that causing misidentification. More accurate species identification can be done by molecular identification using rDNA ITS region. Electrophoresis results indicated that chromosomal DNA of endophytic fungi LBKURCC69 was successfully isolated and has a molecular weight of 6124 bp. DNA amplification of endophytic fungi LBKURCC69 on rDNA ITS regions was successfully performed using ITS4 and ITS5 primers with 45°C annealing temperature and produces DNA fragments with a molecular weight of 537 bp.
POTENSI ARANG AKTIF TULANG SAPI SEBAGAI ADSORBEN ION TIMBAL, KADMIUM, NITRAT DAN KLORIDA DALAM LARUTAN Ayu Antika; Sofia Anita; Tengku Abu Hanifah
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

Cow bone can be used as raw material of craft. Based on the development of science and technology cow bone can be utilized for many purposes, for example, it could be as an adsorbent. Cow bone can also be used as an activated charcoal, because bone contains about 35% of organic compounds. Activated charcoal was made of cow bone through carbonization and activation processes. The activation process used Na 2 CO 3 as an activator which the concentration is 2,5%, 5% and 7,5%. In this experiment, activated carbon of cow bone was used to adsorbed is cadmium, lead, nitrate and chloride ions in solution. Cadmium and lead were analyzed using atomic absorption spectrophotometer (AAS), while chloride was analyzed using Argentometry Mohr method and nitrate was analyzed using Brusin Sulfate method. The adsorption capacity of the activated charcoal cow bones to cadmium, lead, nitrate and chloride ions are 99.9643%, 99.9481%, 90.5885% and 10.145% respectively.
ANALISIS KANDUNGAN LOGAM TIMBAL PADA SAYUR KANGKUNG DAN BAYAM DI JALAN KARTAMA PEKANBARU SECARA SPEKTROFOTOMETERI SERAPAN ATOM Pinta Erdayanti; Tengku Abu Hanifah; Sofia Anita
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Vegetable has a lot of vitamins and minerals that useful for people. Therefore, hygiene and safety of vegetables consumed are important for healthiness. Many types of vegetables that circulated in the community were unsafe because allegedly contaminated with heavy metals such as lead, especially the vegetables planted in the roadside. The aims of this study is to determine the metal content of Pb in vegetable water spinach, spinach and soil sample which planted in Kartama street Pekanbaru. Lead content was determined using an atomic absorption spectrophotometer at the wavelength of 283.3 nm. The results showed that the highest of Pb was found in spinach (0.4234 mg/Kg) and soil sample that the spinach planted (1.6418 mg/Kg) was taken from ST1. The result of this study indicates that the sample spinach contains Pb that did not exceed the maximum limit of standar nasional (SNI 01-7387-2009) that is 5 mg/Kg and soil sample is 10 mg/Kg.
ANALISIS KANDUNGAN LOGAM MERKURI, KADMIUM, TIMBAL DAN SIANIDA PADA ALIRAN SUNGAI INDRAGIRI, KABUPATEN INDRAGIRI HULU Nola Oktaria; Tengku Abu Hanifah; Sofia Anita
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
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Increasing activities of illegal gold mining caused environmental damage of the river. Heavy metal pollution of Hg, Pb, Cd and CN‾ were derived from mining waste dumped into the river. This research was analysed of the metal content of Hg, Pb, Cd and CN‾. Samples were taken at 4 sampling points, for Hg, Pb and Cd were analyzed by Atomic Absorption Spectrophotometry method and CN‾ were analyzed by Uv-Vis Spectrophotometry. The results show that the concentration of Hg was in between 1.30 – 3.35 ppb, Cd 0.1002 – 0.1684 ppm, Pb not detection – 0.988 and CN¯ not detection – 0.72 ppm. All of the metal concentration have passed a specified threshold limit of PP No. 82 Tahun 2001, except for Pb on the ST2 and Cyanide ion on the ST4, that are still below the limit.
POTENSI ARANG AKTIF DARI LIMBAH TULANG KAMBING SEBAGAI ADSORBEN ION BESI (III), KADMIUM (II), KLORIDA DAN SULFAT DALAM LARUTAN Fiqih Khairani; Itnawita '; Subardi Bali
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
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Goat bone waste had not been used optimally up till now it is only used as handicraft. Chemically the goat bone contains 22% of organic matrix that is possible to be used as a raw material for activated charcoal. The activated charcoal of goat bone was made of through two stages that are carbonization at a temperature of 700oC and activation using Na2CO3 with various concentration of 2,5%; 5,0% and 7,5% at a temperature 800oC. From characterization, it was obtained that activation using 5,0% Na2CO3 gave a good characteristics with the value of moisture content is 7,5269%, ash content is 19,1423%, the adsorption of iodine is 200,2239 mg/g and a surface area is 91,1557 m2/g. The activated charcoal at a concentration of 5,0% Na2CO3 was used to adsorp ions of iron, cadmium, chloride and sulfate based on various concentration of 100, 200, 300, 400, 500 and 600 ppm that were contacted for 24 hours. The optimum adsorption ability of the activated charcoal of goat bone was obtained at a concentration of 200 ppm with the adsorption cations of iron ions (99,8875%) and cadmium ions (99,9609% ) that were analyzed using an Atomic Absorption of Spectrophotometer (AAS), while sulfate ions (77,7976%) that was analyzed using a UV-VIS Spectrophotometer. However, the adsorption of activated charcoal goat bone was not good enough for chloride ions (11,9528%) that was analyzed by Argentometry (Mohr) method.

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