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Makara Journal of Science
Published by Universitas Indonesia
ISSN : 23391995     EISSN : 23560851     DOI : https://doi.org/10.7454/mss
Core Subject :
Makara Journal of Science publishes original research or theoretical papers, notes, and minireviews on new knowledge and research or research applications on current issues in basic sciences, namely: Material Sciences (including: physics, biology, and chemistry); Biochemistry, Genetics, and Molecular Biology (including: microbiology, physiology, ecology, taxonomy and evolution); and Biotechnology.
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Articles 880 Documents
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PENGARUH MUSIM TERHADAP FLUKTUASI KADAR FOSFAT DAN NITRAT DI LAUT BANDA Edward, Edward; Tarigan, M. M.
Makara Journal of Science Vol. 7, No. 2
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Abstract

The Influence of Season to Nitrate and Phosphate Content Eutrophication in Banda Sea. Observation on phosphate and nitrate nutrient content were carried out in May, August, November, 1996 and February 1997 in Banda Sea. The results showed the averages content of phosphate and nitrate in August is higher compared to May, November and February. Phosphate content in August 1.492 mg.at/l, while in May, November and February are 1.025 mg.at/l, 0.878 mg.at/l and 0.766 mg.at/l. Nitrate content in August is 1.932 mg.at/l, while in May, November and February are 0.975 mg.at/l, 0.804 mg.at/l and 0.670 mg.at/l respectively. This result fixed with statistical Analysis (Randomized Block Anova) (Fh > F t 1%). This condition is caused by upwelling process in Banda Sea at that time.
PENDETEKSIAN JENIS DAN KELAS AROMA DENGAN MENGGUNAKAN METODE ONE-VS-ONE DAN METODE ONE-VS-REST Rustam, Zuherman; Kusumoputro, Benyamin; Widjaja, Belawati
Makara Journal of Science Vol. 7, No. 3
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Abstract

Aroma classification using one-vs-one and one-vs-rest methods. Computational Intelligence used in pattern classification problem can be divided into two different parts, one based on Neural Network and the other based on Statistical Learning. The Statistical Learning discovered by Vapnik on 70-est decade. For the pattern classification, Vapnik developed hyperplane optimal separation, which is known as Support Vector Machines Method (SVM). In the beginning, SVM was designed only to solve binary classification problem, where data existing are classified into two classes. To classify data whose consist of more than two classes, the SVM method can not directly be used. There are several methods can be used to solve SVM multiclasses classification problem, they are One-vs-One Method and One-vs-Rest Method. Both of this methods are the extension of SVM binary classification, they will be discussed in this article so that we can see their performance in aroma classification process. Data of aroma used in this experiment is consisted of three classes of aroma, each of them has six classes. The division of this class is based on alcohol concentration mixed into each of those aromas. For example, for aroma A, there are six kinds of aroma A with different alcohol concentration: 0%, 15%, 25%, 30%, 45% and 75%. The performance of these methods is measured based on their ability to recognize and classify aroma, precisely and match with the right class or variety of data existed.
BEBERAPA CATATAN FAUNA EKHINODERMATA DARI PERAIRAN TAPAK TUAN, ACEH SELATAN NANGROE ACEH DARUSSALAM Yusron, Eddy
Makara Journal of Science Vol. 7, No. 3
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Notes On The Echinoderm Fauna Of The Tapak Tuan Bay Waters, Aceh Selatan The Nangroe Aceh Darussalam. A total of 21 species of echinoderms, belonging to of 5 species Holothuroidea, 5 species of Asteroidea, 4 species Echinoidea and 7 species Ophiuroidea have been found in the Tapak Tuan of Aceh Selatan. The Ophiuroidea were relatively dominant in the sea grass zone. On the basis of population density, Ophiuroidea was the dominant group and relatively highest in the individual density. In general, the number of species of echinoderm fauna is smaller than that in the Sekotong Lombok Barat bay waters. The species composition, community structure, zonation, and spatial distribution of echinoderm fauna are discussed in this paper.
KANDUNGAN TOTAL ZAT PADAT TERSUSPENSI (TOTAL SUSPENDED SOLID) DI PERAIRAN RAHA, SULAWESI TENGGARA Tarigan, M S; Edward, Edward
Makara Journal of Science Vol. 7, No. 3
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Total Suspended Solid Content in Raha Waters, Northeast of Celebes. Measurement on Total Suspended Solid (TSS) in Raha waters were carried out in May 2001. The results showed that the content of total suspended solid varied between 74,8 – 78,9 ppm with averages content is 76,5 ppm. This content is still suited to the threshold value stated by government decree in 1988 for fishery and sea conservation park, but not suitable for recreation (swimming, diving activity).
KANDUNGAN LOGAM BERAT Pb, Cd, Cu, Zn DAN Ni DALAM AIR LAUT DAN SEDIMEN DI MUARA SUNGAI MEMBRAMO, PAPUA DALAM KAITANNYA DENGAN KEPENTINGAN BUDIDAYA PERIKANAN Tarigan, Z.; Edward, Edward
Makara Journal of Science Vol. 7, No. 3
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Abstract

Heavy Metals Content Pb, Cd, Cu, Zn And Ni In Sea Water And Sediment In Membramo Estuary And Its Relationship With Fishery Cultivation. Obervation on heavy metals Pb, Cd, Cu, Zn and Ni content in Jakarta Bay were carried out in August 2003. The results showed that the Pb, Cd, Cu, Zn, and Ni content still in line with threshold value stated by for fisheries. By the all, in sea water Zn content is higher compared to the others, while in sediment Ni is higher. This data showed the result show that on waters of Membramo River Zn and Ni waste than others elements.
STUDI KARAKTERISASI OPTIS LAPISAN TIPIS a-SiC:H HASIL DEPOSISI METODE GLOWDISCHARGE Saleh, Rosari; Munisa, Lusitra; Marianty, Dewi
Makara Journal of Science Vol. 7, No. 3
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Optical Properties of a-SiC:H Films Deposited by Glowdischarge Methods. The optical properties of amorphous silicon carbon films deposited by glowdischarge method have been studied using ultra violet-visible (uv-vis) spectroscopy. The refractive index was calculated by Swanepoel’s formula using transmission data then followed by numerical simulation. The films density tends to decrease with increasing carbon content. The widening of the optical gap by increasing carbon content indicates the enhancement of film’s transparence. Both real and imaginary parts of the dielectric constant show variation in magnitude as the carbon content increase
SISTEM PENGENALAN WAJAH 3-D MENGGUNAKAN PENAMBAHAN GARIS CIRI PADA METODE PERHITUNGAN JARAK TERPENDEK DALAM RUANG EIGEN Lina, Lina; Kusumoputro, Benyamin
Makara Journal of Science Vol. 7, No. 1
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3-D Face Recognition System using Additional Feature Lines in Nearest Feature Line Method in Eigenspace Representation. In this paper, the authors propose a new method in 3-D face recognition system using additional feature lines in Nearest Feature Line method, called the Modified Nearest Feature Line method. The additional feature lines can be acquired by projecting each feature point to other feature lines in the same class without increasing the number of feature points. With these additional lines, the system will have the ability to capture more variations of face images, so it can increase the recognition rate of the system. The authors also propose KL-TSubspace1 and KL-TSubspace2 as methods in transforming the 3-D face images from its spatial domain to their eigenspace domain. The experiments use the 3-D human faces of Indonesian people in various expressions and positions. Then, the system is applied to recognize unknown face images with different viewpoints. Experimental results shown that the system using KL-TSubspace2 and Modified Nearest Feature Line method can have the highest recognition rate of 99.17%.
TERMITE SPECIES RICHNESS ON THE CAMPUS OF UNIVERSITAS INDONESIA, DEPOK Primanda, Andya; Ischak, Tubagus M.; Basukriadi, Adi
Makara Journal of Science Vol. 7, No. 1
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Termites are a group of invertebrates abundant in forested habitats. In this study, we conduct an inventory and spatial analysis of the termite fauna of the UI campus. The survey records the presence of six termite species (Coptotermes curvignathus, Schedorhinotermes javanicus, Macrotermes gilvus, Microtermes insperatus, Odontotermes grandiceps, and Odontotermes javanicus), most of which had been reported by previous studies. The spatial analysis of termite nest distribution suggests a random scattering of termite nests in the UI campus.
OBSERVATION ON THE FEEDING OF NUDIBRANCH Phyllidia varicosa LAMARCK, 1801 ON THE SPONGE Axinyssa cf. aculeata WILSON, 1925 IN CORAL REEFS OF PRAMUKA ISLAND, THOUSAND ISLANDS NATIONAL PARK, INDONESIA Yasman, Yasman
Makara Journal of Science Vol. 7, No. 1
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During three months period observations (November 16 to January 13, 2001) in coral reefs of Pramuka Island Indonesia, the nudibranch Phyllidia varicosa was observed while feeding on the sponge Axinyssa cf. aculeata. During feeding, P. varicosa extended externally the pharyngeal bulb onto the sponge causing visible somatic damage. The behaviors of contracting the body and retracting the rhinopores inside the rhinotube were also observed while feeding. Observations on the feeding of Phyllidia varicosa on the sponge Axinyssa cf. aculeata and the presence of a visible somatic damage on the prey due to predation are reported for the first time.
PREPARATION of [BzMe3N]2[Na2W4O12(OMe)4(MeOH)6].6MeOH Bakri, Ridla
Makara Journal of Science Vol. 7, No. 1
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Abstract

An attempt to prepare trinuclear tungsten oxoalkoxides [BzMe3N]3 [W3O8 (OMe)5 ] from the reaction between WO2 (OMe)2 , [BzMe3N]2WO4 and [BzMe3N](OMe) in the ratio of 2:1:1 in MeOH produced [BzMe3N]2 [Na2W4O12(OMe)4 (MeOH)6 ].6MeOH. Suitable crystals for X-ray chrystallographic studies were obtained from hot mixture of methanol-acetonitrile solution. The I.R., 1H-NMR, and microanalysis data including crystal structure of [Na2W4O12(OMe)4 (MeOH)6 ] 2- anion are reported

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