Journal of Aceh Physics Society
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Simulation of Wind Speed Effect on the Fall Velocity of Raindrops
Full text linkRaindrop motion is affected by several factors; one of which is wind speed during the rain. This study is aimed to investigate that impact by using mathematical simulation with Fortran and Matlab. Raindrops arrive on the Earths surface at their terminal velocities which depend on their size. Raindrop falling motion could be analyzed with net force equation (Newtons second law). In order to determine velocity and position equations as a function of time, coefficients in those equations were fitted and compared toraindrop model developed by Boxel in 1997. In this study, equations used are fitted to both large and small size raindrops. Values resulted by equation for large size drops agreed with experimental data. Wind speedcauses the terminal velocities of raindrops to get larger, and so does their kinetic energy. In that condition, raindrops fall with certain inclination angle. The stronger wind speed, the larger raindrops inclination angle and their kinetic energy are when hitting soil surface. Therefore it increases the risk of soil erosion at place where the soil is unstable. Through this study, speed and direction of raindrop when hitting soil surface could be investigated in order to decrease the risk of avalanche at high risk area
Mineral Prospect in Simpang Tiga, Aceh Besar
Full text linkSimpang Tiga is one district in Aceh Besar that currently supply rock and building materials for construction in Banda Aceh. Geologically, Simpang Tiga is formed by sedimentary rocks and carbonate minerals. This study aims is to identify the types of minerals in Simpang Tiga that has economic value. In this study the samples are identified using naked eye and optical microscope to identify more clearly. After that, the comparison with catalogue is made. HCl is used to identify carbonate type minerals. The results indicate that there are classes of carbonate mineral that are calcite (CaCO3) and dolomite (CaMg (CO3)2). Oxide groups with the type of mineral are the mineral magnetite (Fe3O4), hematite (Fe2O3), magnesium (MgO) and agate (SiO2). Group with the type of mineral silica is a mineral biotite (K(Mg,Fe)3 (AlSi3)O10(OH, F)2. Result shows that Simpang Tiga have deposit of carbonate and oxide type of mineral, which are potential for economic development, building materials and industrial materials such as cement raw material and iron ore
Study on Impact of Variation of Carbon Monoxide Concentration to Air Temperature at Simpang Lima, Banda Aceh
Full text linkStudies on impact of variation of carbon monoxide concentration to air temperature have been conducted at Simpang Lima, Banda Aceh. Objectives of this research are to determine the level of emissions of carbon monoxide from motor vehicles, to study the fluctuations of air temperature in the area, andto analyze the impact of increasing carbon monoxide concentration to the air temperature at Simpang Lima Banda Aceh during 2010. Concentration of carbon monoxide and air temperature were recorded by Air Quality Monitoring System (AQMS) device installed at Simpang Lima Banda Aceh. The result shows that carbon monoxide concentration increases as well as number of vehicles passing the area. Change of the concentration in the air is also influenced by temperature variability in the research area. For the temperature, beside affected by carbon monoxide concentrations are also influenced by weather factors such as solar radiation, wind speed and precipitation. However, levels of carbon monoxide concentration at Simpang Lima, Banda Aceh are considerably safe for the environment, i. e. less than 100 ppm
Mechanical Analysis of Serpentinite rock in Indrapuri, Tangse, and Beutong
Full text linkAceh is one of province that has abundant natural resources, which consist of natural resources which can be renewed or not renewed. With the increasing human population, especially in Indonesia, resulting in increasing human needs of various sectors, particularly in the construction sector. In the development activities required a lot of materials-minerals, such as sandstone, limestone, serpentinite rock which serves for a variety of needs in development activities. In District Indrapuri (Aceh Besar Regency), Tangse (Pidie Regency), and Beutong (Nagan Raya Regency) finding of the serpentinite rock is abundance. Meanwhile, in line with the rapid physical development in Aceh and its surroundings, then the needs of rock as building materials will increase as well. Research done by physical properties (specific gravity, absorption, porosity), and mechanical properties (testing compressive strength, wear/abrassion) of serpentinite rock to determine its quality as a building material. The results show that the serpentinite rock contained in District Indrapuri, Tangse, and Beutong for the building according SII 0378-80 is qualified for the foundation, curb stones, and ornamental stones or paste stones
Thermal Conductivity of Foamed Concrete Fibre Arenga Pinnata Merr
Full text linkThe objective of this research is to examine the effect of the palm fibre from arenga pinnata Merr on thermal conductivity of foamed concrete. The sample was made at civil Engineers Departement labolatory with specific gravity of 1.0 and 1.4 with variations of the palm fibre from arenga pinnata Merr are 0.5 %, 1.0 %, and 2.0 %. The sample was packed into (15 x 15 x 1) cm3. The measurement result showed that the thermal conductivity values are increase with the small porosity, i.e. 18 %, on the contrary, the thermal conductivity values are decrease with the large porosity, i.e. 27 %. The thermal conductivity values of concrete the palm fibre from arenga pinnata Merr addiction are 0.47 W/mC, 0.52, W/mC, and 0.44 W/mC for specific gravity values 1.0 with 0.5 %, 2.0 %, and 2 %. It about 0.48 W/mC, 0.45 W/mC and 0.43 W/mC for specific gravity values 1.4 with 0.5 %, 1.5 %, and 2.0 %. In conclusion, the thermal conductivity values of foamed concrete with the palm fibre arenga pinnata Merr addiction has the largest value in specifict gravity 1.0 with 2.0 % of the palm fibre arenga pinnata Merr percentag
Mechanical Analysis Of Limestone In Jaya, Lhong, And Lhoknga
Full text linkResearch about mechanical analysis of limestone in District Jaya, Lhong, and Lhoknga has been done from Dec. 2011 to Mei 2012. This study aim is to classify the limestones based on physical and mechanical tests as well as identify opportunities limestone utilization in accordance with the SII 0378-80 as a condition of quality natural stone for building. Research have been done by testing compressive strength, modulus Young, wear, specific gravity, porosity, and absorption. The result shows that the limestones are qualified natural stone for building the foundation, curbstone, stone and ornamental stone or paste
River Water Quality Spatial Analysis Based On Physical Parameter Throughout Krueng Daroy In Banda Aceh
Full text linkWater quality research has been done along Krueng Daroy in Banda Aceh. The research is aimed to observe water quality based on physical parameters and to identify the sources of pollutant spatially. We measured temperature, turbidity, color, pH, odor, TDS and electrical conductivity, where the data were collected using thermometer, turbidity meter, spectrophotometer, pH meter, TDS meter and conductivity meter, respectively. The physical parameters of water in the upstream area fulfilled the standard of the Health Minister of Republic Indonesia according to law Number 907/ MENKES/ SK/VII/2002 and it is suitable for household needs. However, the water at the downstream area are mostly pollute
Studies of Relation Between Turbidity and Refractive Indeks of Bottled Water in The Area of Banda Aceh by Using Interferometer Murty Method
Full text linkBottled water is clean water ready to drink quickly without cooking however, it is not all of the bottled water have a good quality. The quality of water can be observed from the optical properties of water, such as clarity and refractive index. A study has been carried out by using interferometer Murty method to know the relation between turbidity and refractive index of the bottled water. The refractive index measurement was carried out for 20 samples from 10 brands of the bottled water. The result of refractive index measurement shows that the refractive index of the water is about 1,1, in averge on the other hand the refractive index of water based on literature is 1,33. Along with the refractive index measurement by using interferometer Murty, turbidity was also measured by using Turbidimeter. The result of measurement show that there is a relation between turbidity and refractive index. The deviation of refractive index values obtained in this measurement from the literature data is because there are some error in the measurement process. By improving the error, better measurement will allow the interferometer Murty to be used to inspect water clarity