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Jurnal Natural
Published by Universitas Syiah Kuala
ISSN : 14118513     EISSN : 25414062     DOI : https://doi.org/10.24815/jn
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Energy Immunology & microbiology Neuroscience Physics
Jurnal Natural (JN) aims to publish original research results and reviews on sciences and mathematics. Jurnal Natural (JN) encompasses a broad range of research topics in chemistry, pharmacy, biology, physics, mathematics, statistics, informatic and electronic.
Arjuna Subject : Matematika - Matematika (Lain-Lain)
Articles 8 Documents
 1 
Search results for , issue "Volume 14, Number 2, September 2014" : 8 Documents clear
Chemical Activation of Bentonite Clay and Its Adsorption Properties of Methylene Blue Susilawati Susilawati; Nurul Alam Naqiatuddin
Jurnal Natural Volume 14, Number 2, September 2014
Publisher : Universitas Syiah Kuala

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Abstract

Study on adsorbent properties of bentonite such as optimum activation condition, concentration concentration effect of sulphuric acid, activation temperature and activation time on decolorization of methylene blue have been investigated in this paper. The study was started by activation of bentonite with sulfuric acid. The data was analysis by statistical method via Least Significant Difference (LSD) test. The optimum condition of adsortion showed that the concentration of activating agent (sulphuric acid) was 20%, activation temperature at 110 ºC and activation time was 30 minutes. At this optimum condition, methylene blue was absorbed by bentonite with 93.30% yield.
REVIEW OF IRRATIONAL NUMBERS Hafnani Hafnani; Rahma Zuhra
Jurnal Natural Volume 14, Number 2, September 2014
Publisher : Universitas Syiah Kuala

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Abstract

Study of the set properties is simple and rarely investigated at the Department of Mathematics. This paper examines some set properties on the irrational numbers. The study is about the properties applying to the real numbers which are a complete ordered field. However, the results of this study show that those properties do not imply to the irrational numbers, but the ordered property. The prove of the irrational numberby some examples is demonstrated in this study.
Application of Magnetics Method to Mapping the Geothermal Source at Seulawah Agam Area Asrillah Asrillah; Marwan Marwan; Ibnu Rusydy; Gartika Setiya Nugraha
Jurnal Natural Volume 14, Number 2, September 2014
Publisher : Universitas Syiah Kuala

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Abstract

Magnetic method had been employed at Seulawah Agam area in term of unveiling the potentially geothermal source. This method was carried out locally in both the geothermal filed of Heutsz’s Crater and Cempaga’s Crater where the locations are in Seulawah Agam slope which is included in Aceh Besar District. Geologically, the area is mainly controlled by volcanic mudflow and Lam Teuba’s rocks consisting of breccia, pumice and tuff and their age are from Tersier to Resen Period. The deployed equipment consisted of Magnetometer GSM-19T, Proton Sensors, Aluminum Stick, Connection Cable, GPS Antenna, Compass, and Watch. Portable GPS (Global Positioning System), Navigation type (map of the survey area), and complemented by the other technical equipment, such as handy talky, umbrella, pens and notes of observed data. This study was done by following two steps. At first, the base station was established as a reference point for all magnetic data of measurements. Furthermore, recording magnetic data at each point by repeating three times until the last point by following the looping pattern as pathway of measurement both in Heutsz’s crater whose nine point recordings and in Cempaga’s crater whose seventeen points was consecutively done. The data were simply processed by using Microsoft excel that can just plot the magnetic anomaly and interpreted qualitatively being preliminary research. The result showed that at the north pathway had high magnetic anomaly of rocks located at B6 point and it was assumed as the area having the economically mineral in fracture zones. The rocks with low a anomaly value were obtained at –F125 BR is suggested as the thermal sources while at the South pathway from observing station till the Cempaga’s crater was obtained the geological structure as the Sumatran Fault of Aceh’s segment at CK4 point and this finding showed similar correlation with the result of gravity survey at same pathway published in another paper. In conclusion, this method effectively showed that the Seulawah Agam has potency as thermal source.
Antagonistic Ability of Trichoderma sp. against Ganoderma sp. on Litter Medium of Acacia mangium Samingan Samingan
Jurnal Natural Volume 14, Number 2, September 2014
Publisher : Universitas Syiah Kuala

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Abstract

Trichoderma sp are common fungi in the soil and play important role in decomposing of cellulose-rich. The distribution of Trichoderma sp (TBPH isolate) in litter layers of Acacia mangium was observed in two years’ old of health standing (2S) and Ganoderma sp-attacked standing (2G). The objectives of this research were to observe Trichoderma sp distributions in leaf litter layers and to determine of antagonistic ability of Trichoderma sp TBPH against Ganoderma sp (GBR isolate). Trichoderma sp in sawdust medium was spread above of F litter layer in 50 x 50 cm area. Total populations of Trichoderma were observed each month during eight months. Antagonistic activities of Trichoderma sp TBPH against Ganoderma sp GBR were tested by dual test method on PDA and PDA with litter powder (PDAS) media.  The results showed that populations of Trichoderma sp were fluctuating and the highest population on both standings of F layer   and were followed by H and L layers. Fluctuations of Trichoderma sp population on L layer were tended to follow rainfall fluctuations while those on F layer were tended to follow litter pH fluctuations. Antagonistic test showed that inhibition percentage of PDAS medium was lower than those of PDA medium indicating litter amendment on media being causes of lower antagonistic activities of Trichoderma sp.
Classification of Jades (Giok) Beutong Aceh based on Mineral Composition Nurul Aflah; Muchlis Muchlis; Khairul Halimi; Hayatun Nufus; Zoraya Maysura; M. Zuhri Simatupang
Jurnal Natural Volume 14, Number 2, September 2014
Publisher : Universitas Syiah Kuala

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Abstract

Beutong is a commercial origin of various kinds of Jade (Giok) in Aceh Province. From the geological view the formation of jade is due to the mélange zone. The zone is usually an assemblage of a variety mineral composition. The paragenetic minerals of the jade can be divided into four categories, which are Jadeite, Nephrite, Serpentine and Vesuvianit. The characteristics of the color were associated with a variety of constituent minerals which can be red, yellow, brown, gray, and black. Thus, by this paper we classified the jades based on their mineral constituents.
The Application of Fitness Sharing Method in Evolutionary Algorithm to Optimizing the Travelling Salesman Problem (TSP) Nurmaulidar Nurmaulidar
Jurnal Natural Volume 14, Number 2, September 2014
Publisher : Universitas Syiah Kuala

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Abstract

Travelling Salesman Problem (TSP) is one of complex optimization problem that is difficult to be solved, and require quite a long time for a large number of cities. Evolutionary algorithm is a precise algorithm used in solving complex optimization problem as it is part of heuristic method. Evolutionary algorithm, like many other algorithms, also experiences a premature convergence phenomenon, whereby variation is eliminated from a population of fairly fit individuals before a complete solution is achieved. Therefore it requires a method to delay the convergence. A specific method of fitness sharing called phenotype fitness sharing has been used in this research. The aim of this research is to find out whether fitness sharing in evolutionary algorithm is able to optimize TSP. There are two concepts of evolutionary algorithm being used in this research. the first one used single elitism and the other one used federated solution. The two concepts had been tested to the method of fitness sharing by using the threshold of 0.25, 0.50 and 0.75. The result was then compared to a non fitness sharing method. The result in this study indicated that by using single elitism concept, fitness sharing was able to give a more optimum result for the data of 100-1000 cities. On the other hand, by using federation solution concept, fitness sharing can yield a more optimum result for the data above 1000 cities, as well as a better solution of data-spreading compared to the method without fitness sharing.
Study of Seulawah Agam’s Geothermal Source Using Gravity Method Marwan Marwan; Ibnu Rusydy; Gartika Setiya Nugraha; Asrillah Asrillah
Jurnal Natural Volume 14, Number 2, September 2014
Publisher : Universitas Syiah Kuala

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Abstract

Gravity method was carried out at Seulawah Agam Area to delineate the existence of geothermal source, which is specifically existed in both the geothermal filed of Heutsz’s Crater and.Cempaga’s Crater. The Seulawah Agam is located in Aceh Besar district. Geologically, the area is dominated by volcanic mudflow and Lam Teuba’s rocks having age from Tersier to Resen Period. The equipment used includes Gravimeter CG-5 Autograv, Portable GPS (Global Positioning System), Navigation type (map of the survey area), computer and the other technical supports, such as handy talky, umbrella, watch, pens and observed data notes. This research was conducted by doing two stages.  Firstly, establishing the base station which is a reference point for all gravity data measurements at each point. Secondly, measuring gravity data at each point by repeating three times following looping pattern as pathway of measurement either in Heutsz’s crater whose nine points recording or in Cempaga’s crater whose seventeen points. The data was simply processed using Microsoft Excel that can just plot the Bouguer anomaly and interpreted qualitatively due to preliminary research. The resultof this research has shown that both areas have two kinds of Bougeur anomalies which slightly attract attention who’s high and low anomaly. At Heutsz’s Crater has high and low density existed at F125 FR and B6 point. The Point whose high density means that it was formed mineralization by hydrothermal process through fracture materials, meanwhile the point whose low density indicates that there is existed the fault which is quite related to Seulimum’s Fault based on Aceh map. This result is also same as obtained at Cempaga’s Crater which means also same interpretation. In addition, it can be sum up that fault zones are essentially important in geothermal system that plays vital role in term of fluid circulation. Employing the gravity method in this research effectively can be said
Ornaments of Flora and Fauna on Traditional Acehnese House Sofyan Sofyan
Jurnal Natural Volume 14, Number 2, September 2014
Publisher : Universitas Syiah Kuala

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Abstract

This study was aimed to explore ornaments on the Traditional Acehnese House (TAH) in Banda Aceh. Data were obtained by direct survey and interview methods to TAH and owners, carpenters, and community leaders. Secondary data were obtained from literatures, manuscripts, and museums. Ornaments on the TAH are dominated by elements from flora more than fauna. Other ornaments are dominated by clouds, stars, mountains, curved lines, straight lines and geometry. Few numbers of ornaments from fauna were also influenced by the Islam regulation.

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