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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 9 Documents
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Search results for , issue "Volume 13, Number 1, March 2013" : 9 Documents clear
IDENTIFY CONNECTIVITY GRAPH USING A MODIFIED PRÜFER’S ALGORITHM LABELLING TREES Al Aiyub; Mahyus Ihsan; Rahma Zuhra
Jurnal Natural Volume 13, Number 1, March 2013
Publisher : Universitas Syiah Kuala

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Abstract

Connectivity of graph easily can be given when we see it with the bare of eyes, but needs an algorithm that can assure the connectivity in computerization. Some graphs require the connectivity in their definitions, such as Hamiltonian graph, Eulerian graph and tree. The connectivity become important in order to solve any of graphs' problems by using computer technology. Most of the algorithm cannot run perfectly, if the graph which is given was not connected. It is happened to Djikstra and Prufer graphs for example. However, this study will provide the solution by modifying Prufer algorithm to show the connectivity in the graph.
XRD ANALYSIS OF Bi-2212 SUPERCONDUCTORS: PREPARED BY THE SELF-FLUX METHOD Nurmalita Nurmalita; Nailul Amani; Fauzi Fauzi
Jurnal Natural Volume 13, Number 1, March 2013
Publisher : Universitas Syiah Kuala

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Abstract

An experiment had been carried out on formation of Bi-2212 crystals with the self-flux method. Flux was used and derived from CuO and CaCO3. The process of synthesis was equipped with the melting process at temperature 890 °C with time variation of melting 35 minutes and 40 minutes, followed by slow cooling at a rate of 1°C/hour for 70 hours. The results were obtained and characterized by XRD test. This research aimed to produce superconducting materials with self-flux method, calculate the percentage of the value of the volume fraction, the percentage of oriented phase and impurities. Samples generated from XRD measurements were made to match with the XRD Strobell’s pattern of the superconducting Bi-2212 standards. The results showed that the value of the volume fraction of 2212 phase and the phase of the highest oriented melting at 40 minutes were equal to 67.68% and 38.89%, while the smallest impurity phase of 32.32% were obtained at the same time melting.
AN INDICATION OF AFRICAN CATFISH’S (CLARIAS GARIEPINUS) BEHAVIORAL CHANGES AS A RESPONSE FOR INCREASED SEISMIC ACTIVITY Teuku Reza Ferasyi; Mustafa Sabri; Hamdani Hamdani; Azhari Azhari; Amiruddin Amiruddin; Erwin Erwin; Wolfgang Straka; Robert Faber
Jurnal Natural Volume 13, Number 1, March 2013
Publisher : Universitas Syiah Kuala

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Abstract

This report was aimed to describe the behavioral changes of catfish as observed before two different earthquakes hit the Province of Aceh, Indonesia in year of 2012. A number of 5 African’s catfish (Clarias gariepinus) were placed in an aquarium located in Gapang, Sukakarya Sub-district of Sabang Town, Aceh. Their behavior activities were observed manually at three different times (08.00 AM, 01.00 PM, and 05.00 PM) every day from 1st March up to 11th April 2012. The result of observation showed that the activity of catfish was different between all of them from 1st March 2012 up to morning observation on 11th April 2012. Most of those activities was not showed as very active behavior. However, their behavior was very active in the same pattern when observed at noon and afternoon times on 11 April 2012. On this date, there were two consecutive earthquakes happened at magnitude of 8 Richter Scale at 03.38 PM and 05.43 PM. The epicenter of this earthquake was in Simeulue, with the distance of more and less of 390 km from observation station of catfish in Gapang. It was noted that this abnormal behavior possibly showed as an indication of their ability to detect the increase of pre-seismic activity at 2.38 hours and 43 minutes before the two earthquakes. Perhaps, it is the result of their response to the increase of pre-seismic electromagnetic wave. Further continuous observation and research is needed to ensure the role of African’s catfish (Clarias gariepinus) as abio-sensor for the increase of seismic activity.
Free Fatty Acids Purification in Biodiesel with Utilizing Rice Husk Silica Muliadi Ramli; Saiful Saiful; Rahmatun Misriana
Jurnal Natural Volume 13, Number 1, March 2013
Publisher : Universitas Syiah Kuala

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Abstract

Silica particles had been successfully separated and extracted from rice husk by using solution of sodium hydroxides (NaOH) as solvent and were characterized with SEM-EDX. The data SEM-EDX showed that the extracted component of the rice husk contained 79,55% (w/w) of silica as the primary component. In order to understand the adsorption capacity of silica in removing free fatty acids (FFA) which were recognized as the contaminants in biodiesel., the profile of time dependence and silica amount in the adsorption process had been investigated in this study. The results indicated that the adsorption process showed optimum condition at 30 minutes with the free fatty acids (about 90,64%) of adsorption). Moreover, the adsorption capacity of silica to those impurities contaminated in biodiesel was proportional to the amount of adsorbent used in the experiment. Finally, biodiesel with less FFA was produced, and the FFA residues remained in the biodiesel were 0,58 mg/g.
ANTIMICROBIAL ACTIVITY OF n-HEXANE EXTRACTS OF RED FRANGIPANI (Plumeria rocea) Muhammad Ali Husni; Murniana Murniana; Hira Helwati; Nuraini Nuraini
Jurnal Natural Volume 13, Number 1, March 2013
Publisher : Universitas Syiah Kuala

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Abstract

Antimicrobial assay of n-hexane plant extracts against Escherichia coli and Staphylococcus aureus had been done. Extraction with n-Hexane of the flowers yielded 2,08% of extract, while leaves and stems yielded 3,21% and 2,19% of n-hexane extracts, respectively. The extracts showed different activity against both bioindicators. The leaves extracts showed the strongest activity indicated by wider diameters of inhibition zone, 19,7 mm against E. coli and 13,3 mm against S. aureus at 10% of the extracts’ concentration. At the same concentration (10%), the steam and flower extracts showed less inhibitory activities with  11,3 mm and 8,3 mm against E. coli, and 12,0 mm and 11,0 mm against S. aureus. At the lowest concentration of the extracts, the leaves extracts showed the strongest activity against E. coli (14,3 mm) while the steam extracts showed highest inhibitory activity against S. aureus ( 7,7 mm). Based on antimicrobial assay, it was suggested that the leaves extracts demonstrated strongest activity than other extracts. It was assumed that leaves extracts contained more secondary metabolite than flowers and steams, and the leaves have phenol compounds which are not present in other extracts.
Trichoderma virens ISOLATED FROM COCOA PLANTATION IN ACEH AS BIODECOMPOSER COCOA POD HUSK Rina Sriwati; Tjut Chamzurni; Bukhari Bukhari; Anwar Sanjani
Jurnal Natural Volume 13, Number 1, March 2013
Publisher : Universitas Syiah Kuala

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Abstract

Sustainable development on cocoa farming have been places great emphasis on the management of natural resources for Cocoa pod husk. Until now, there has been much public attention for a farming waste, environment polluting and a place to develop various diseases, especially fungal Phytopthora. To overcome these problems, it needs to utilize alternative cocoa pods. The aims of this study were: (1) to determine the potential use of Trichoderma virens isolated from cocoa plantation in Aceh as bio-decomposer in the composting process cocoa pods. The composition of potential use experiment; Manure+Trichoderma (PT); Cocoa pod husk+Trichoderma (KT); Cocoa pod husk + Manure (KP); Cocoa pod husk +Manure+Trichoderma (KPT) has been tested. The analysis result showed that the combined use of Trichoderma virens compost although no effect on the color, texture and smell of compost but could be effect on characterized of compost maturity by characteristics of C/N compost. The content of C/N compost on all treatments in accordance with the standard compost maturity thus considered quite feasible to be applied to the crop.
IMPORTANCE OF LOCATING STRIKE IN 2D MAGNETOTELLURIC DATA MODELING Nazli Ismail
Jurnal Natural Volume 13, Number 1, March 2013
Publisher : Universitas Syiah Kuala

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Abstract

2D inversion is still believed as the fastest, cheapest, and most reliable method magnetotelluric data interpretation. Traditionally the magnetotelluric data are collected on 2D profile perpendicularly across an assumed geological strike. However there is no guarantee where the chosen strike is exactly or nearly same as true geoelectrical strike. For this purpose, 2D synthetic magnetotelluric impedance data of a simple 2D model were generated along a profile across the model. The data were inverted on various presumed strike in order to study how far the inverted model is deviated when the presumed strike is moved away to the true strike. By the aim, first the data were inverted as measured on 2D profile perpendicularly across true strike in order to see how the inversion works in the ideal case. Thedata were also inverted as measured on 2D profile perpendicularly across an assumed strike. The presumed strike deviated 60 degrees to the true strike was selected as an example of extreme case. The model inverted from the extreme presumed strike data is compared to the actual one. The inversions on determinant and combined TE and TM modes have been done as well for model resolution comparison.
MINERALS COMPOSITION IN ROCKS FROM GOLD MINING AREAS AT GUNONG UJEUN, KRUENG SABEE, ACEH JAYA Zulkarnain A. Jalil; Karmila Sari; Rini Safitri
Jurnal Natural Volume 13, Number 1, March 2013
Publisher : Universitas Syiah Kuala

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Abstract

Currently, several regional general hospitals in Banda Aceh now have excellent support facilities, one of which is a diagnostic X-ray machine. The performance of diagnostic X-ray machine should be checked to determine if the dose received does not harm a patient and produce a good image and provide diagnostic information in a timely and accurate, therefore there are necessary for quality control activities on the machine X-ray. Factors that affect the dosing and imaging results, among others, the amount of the provision of current and voltage. From the research shows that the value of the output voltage generated is not much different from the value of the input voltage with a percentage value below 5%. This value shows a good output machineX-ray because it is still under the maximum tolerance limit of 10%. So the overall results of observations on the machineX-ray is in hospital, the quality control measurements gave values still within safe limits. Then by giving a higher input voltage turns also affect the amount of energy produced, thus affecting also absorbed dose X-rays are produced.
TERMITES SPECIES RICHNESS AND DISTRIBUTION AT RESIDENTIAL AREA IN PT ARUN LNG Syaukani Syaukani
Jurnal Natural Volume 13, Number 1, March 2013
Publisher : Universitas Syiah Kuala

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Abstract

Termites were collected in June 2012 at residental area of Pt. Arun LNG by adopted casual collection and finding colony methods. Six species and four genera had been identified to belong to the higher termites (Kalotermitidae and Rhinotermitidae) and had been collected from different habitats throughtout the residential area. Those species randomly distributed which the highest species richness found at Tarakan (6 species). Residential condition with poor maintenance was contributes to inhabitant of the termites to harbour there. One of the most destructive species, Coptotermes curvignathus, has been found to attacking building as well as plants.

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