PEMETAAN NILAI SUSEPTIBILITAS MAGNETIK PASIR PANTAI GANDORIAH PARIAMAN SUMATERA BARAT

Mapping of magnetic susceptibility values of sand of Gandoriah beach, Pariaman West Sumatera has been carried out. The composition of sand beach was identified using X-Ray Fluorescence Spectroscopy (XRF) and the map of magnetic susceptibility and mass susceptibility of the sample were determined using Software Surfer 11. The samples were collected based on grid technique from 25 points location. The separation between magnetic particles and nan magnetic particles was done using iron sand separator for 1 time process.The result of the calculation of the magnetic degree of the sample using Iron Sand Separator for 1 time prosess showed that the values are in the range of 3,88 %-5,12 %. Magnetic and mass susceptibility values of the sample are in the range of (603,3-1351,46)×10-5 and (112,76–1086,85)×10-8 m3/Kg respectively. Magnetic and mass susceptibility of the concentrate (product of iron sand separator) are in the range of (1367,55–2155,9)×10-5 and (927,41–1774,28)×10-8 m3/Kg respectively. These values are in the range of Ilminate mineral that is (220-380000)×10-5 and (46-80000)×10-8 m3/Kg respectively. The percentage of Fe and Ti increases from 6,276 % to 54,549 % and from 0,441% to 5,102% respectively after being processed by iron sand separator. The results also showed that magnetic susceptibility values increase toward the sea water.

ANALISIS EFEK GERHANA MATAHARI TOTAL 9 MARET 2016 TERHADAP KANDUNGAN TOTAL ELEKTRON IONOSFER

Total elektron contant in ionosphere is affected by several fastors, local time, solar aktivities, geomagnetic disturbance, geographical latitude and longitude. This researh aims to observase level variation of total electron contant during solar eclipse over Indonesia on 9 March 2016. We analyzed GPS data from two GPS stations in different locations with different sun observation geographical latitude and longitude, the locations were Sulawesi station (CAMP) and Maluku station (CAMB). The method used in this research, was data interpretation method computationally, the whole data analyzed using matlab software R2008a. The values of daily TEC range from 20 TECU till 30 TECU. Although the value of TEC when solar total eclipse range from 10n TECU untill 20 TECU. The percentage of decreasing value of TEC when total solar eclipse than the daily value of TEC. Decreasing of TEC value between 20%-40%.

ANALISA POTENSI AKUIFER DI KECAMATAN RUMBAI PESISIR KOTA PEKANBARU DENGAN MENGGUNAKAN METODE GEOLISTRIK ATURAN SCHLUMBERGER

The analysis of aquifer potential has been done in the Rumbai Pesisir District of Pekanbaru City by using the Schlumberger configuration geoelectric method. Data was taken from four villages in Rumbai Pesisir Subdistrict, in Lembah Damai, Limbungan, Limbungan Baru and Meranti Pandak. The result obtained using progress software showed that each location has aquifer with different layer and thickness. The highest aquifer resistivity is located in Lembah Damai Village with a resistivity value of 549.50 Ωm in the third layer, while aquifer with the lowest resistivity value is located in Meranti Pandak Village with a resistivity value of 15.69 Ωm in the third layer. The highest thickness aquifer located in Meranti Pandak Village with a thickness of 48.47 m in the third layer, while the lowest thickness aquifer located in Limbungan Baru Village with a thickness of 11.51 m in the second layer. The Result from lithology of each path shows that flow pattern of water flowing from Lembah Damai Village to Limbungan Village, then Meranti Pandak Village and then Limbungan Baru Village. The results of the analysis of aquifers potential indicate that underground water reserves in the Rumbai Pesisir District of Pekanbaru City are 17.13 x 109 m³.

PENGUKURAN NILAI INDUKTANSI PELAT ALUMINIUM BERDASARKAN VARIASI KAPASITANSI MENGGUNAKAN MODUL EVB LDC 1000

The method that has been done in metal thickness measurement is a plate thickness measurement method using an eddy current based sensor. Eddy current sensors can measure the thickness of non-magnetic metal layers through an inductance relationship with variations in thickness where the thickness used for Cu is 0.4 mm, 0.9 mm, 1.5 mm, 2 mm, 4 mm, while Al is used ie 0.4 mm, 0.5 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 4 mm, 5 mm with a single frequency of 1 Hz with a capacitance value of C0 5 pF. The inductance vs. thickness curve for aluminum and copper has an exponential relationship. The distance between the sensor and non-magnetic material is kept constant at 2 mm. Variations in the value of capacitance C0 used in the measurements are then varied to 100 pF, 200 pF, and 300 pF to see the effect of inductance on the thickness of the plate as a function of the capacitor (C) oscillation.

ANALISIS PENGARUH RESAPAN AIR LAUT TERHADAP INTRUSI AIR SUMUR GALI DESA JANGKANG KABUPATEN BENGKALIS

This study aims to determine how much the pollution level of wells digging to the distance of wells from the coast by analyzing the values of the conductivity, salinity, pH and heavy metals such as Lead(Pb), Iron(Fe) and Manganese(Mn). The method used was purposive sampling with number of sample are 10 sample points with variation distance ± 100 m. Conductivity measurements were carried out in two ways, namely using a conductivitimeter and Wheatstone bridge. The measurement results using conductivity meter indicate that the average conductivity value of a well water sample is 125.50 - 80.04 μS/cm while the comparison using the Wheatstone bridge method has an error percentage value of 6.12 %. The salinity has values ranged from 0.112 - 0.093 ‰ which is classified as fresh water. The measurement of pH values shows indications of pollution, due to water classified as acid with a pH value ranging from 3.1 - 4.1. The measurement of the value of Iron(Fe) and Manganese(Mn) does not indicate water pollution due to heavy metals with an average concentration of Iron(Fe) 0.3697 mg/l and Manganese(Mn) 0.0391 mg/l. Comparison of the salinity and conductivity values to the well distance from the coast does not show relation that correlates with seawater intrusion in Mekar Indah Vilage.

KAJIAN SUSEPTIBILITAS MAGNETIK PASIR BESI PANTAI ARTA SEBAGAI FUNGSI JARAK DARI TEPI LAUT

Magnetic Susceptibility measurements and the identification of elements of iron sand from Arta beach of Pariaman West Sumatera have been done. The samples were dried first under the sun before the separation between magnetic particles of iron sand and non-magnetic particles using Iron Sand Separator. Identification elements of iron sand was done using X-Ray Fluorescence. The total value of magnetic induction was measured using a magnetic Pasco probe PS-2162 using a solenoid 2000 coils turns, dimensions of 3 cm in diameter and 10 cm in length. The solenoid was given an electric current with variations ranging from 2 A – 8 A. The distance between magnetic probe and one end of solenoid was kept constant that was 1 mm. The next experiment was to measure the function of distance ranging from 1 – 5 mm with constant applied current of 8 A. When electric current increase then the total magnetic induction also increase. Total magnetic induction value decreases as the distance increases. Magnetic susceptibility was calculated based on total magnetic induction and magnetic induction of core currents with constant current of 8 A and distance of 1 mm. The value of magnetic susceptibility obtained in the range (2164,71-3159,99)x10-5 which consist of ilmenite mineral (FeTiO3; Antiferromagnetic).Keywords : iron sand, magnetic suseptibility, iron sand separator, solenoid, magnetic induction, and x-ray fluorescence.

PENENTUAN SIFAT MAGNETIK DAN MORFOLOGI PARTIKEL MAGNETIK PASIR BESI PANTAI ARTA PARIAMAN SUMATERA BARAT

Telah dilakukan penelitian tentang sifat magnetik dan ukuran partikel dari pasir besi pantai Arta Pariaman Sumatera Barat menggunakan metode Ball Milling. Sampel pasir besi dipisahkan menggunakan Iron Sand Separator (ISS) sebelum dilakukannya proses penghancuran menggunakan Ball Milling dengan variasi waktu 30 jam, 60 jam, dan 90 jam, kemudian dilakukan Ball Milling lanjutan selama 30 jam pada sampel hasil Ball Milling 90 jam dengan ukuran bola yang diperkecil sebesar 0,6 cm. Untuk pemisahan antara partikel magnetik dan non-magnetik pada hasil Ball Milling menggunakan magnet batang Niodinium Iron Boron (NdFeB). Sifat magnetik seperti suseptibilitas magnetik dan suseptibilitas massa dapat diketahui dengan menggunakan sensor Pasco Magnetic Probe PS-2162 dengan kumparan solenoid 2000 lilitan, panjang 10 cm, dan diameter 3 cm, sedangkan komposisi dari pasir besi menggunakan X-Ray Fluorescence (XRF). Ukuran dan bentuk partikel magnetik ditentukan dengan Scanning Electtron Microscope (SEM). Dari penelitian ini hasil ukuran partikel yang didapat sebesar 935 nm untuk waktu Ball Milling 90 jam dan ukuran dalam rentang sebesar 519 nm untuk waktu Ball Milling 120 jam/90 jam + 30 jam, Bentuk partikel pasir besi hampir bulat untuk masing-masing waktu Ball Milling. Kandungan pasir besi sebelum dan sesudah di Ball Milling selama 120 jam yaitu 6,118% dan 67,746%. Suseptibilitas massa meningkat dari 27955,7 X 10-8 m3/kg menjadi 31478,5 X 10-8 m3/kg . Nilai ini berada dalam interval mineral Ilminite (46-80000) X 10-8 m3/kg .

PERBANDINGAN NILAI SUSEPTIBILITAS MAGNETIK AIR LAUT MENGGUNAKAN METODE QUINCKE DI PANTAI SUMATERA BAGIAN TENGAH

Telah dilakukan penelitian perbandingan nilai suseptibilitas magnetik air laut di pantai barat dan timur sumatera bagian tengah menggunakan metode Quincke. Jumlah sampel yang diambil dari penelitian ini sebanyak 500 ml tiap-tiap lokasi. Jumlah titik lokasi sampel adalah 24 didapatkan dari tiga pantai barat sumatera bagian tengah dan satu pantai timur. Metode yang digunakan untuk pengambilan sampel adalah fungsi jarak dengan rentang 300 m dari tepi pantai. Induksi magnetik solenoida diukur menggunakan Probe Magnetic Pasco Ps-2162 dengan dua buah solenoid 3000 lilitan. Ketika arus dinaikkan induksi magnetik semakin besar. Nilai suseptibilitas magnetik ( χ ) air laut pantai barat menunjukkan rentang -1,04 x 10-5 sampai -4,53(x 10-5). Sampel merupakan bahan diamagnetik. Nilai suseptibilitas magnetik ( χ ) air laut pantai timur menunjukkan rentang -0,5 x 10-5 sampai -1,46(x 10-5).sampel merupakan bahan diamagnetik. Salinitas dan pH menyebabkan perbedaan nilai suseptibilitas magnetik air laut.

PENYERAPAN LOGAM BERAT Pb DAN Cu MENGGUNAKAN KARBON AKTIF BERBASIS MAHKOTA NANAS DENGAN VARIASI KONSENTRASI KALIUM HIDROKSIDA

This study aims to determine the influence of concentration of potassium hydroxide (KOH) on the adsorption of Pb2+ and Cu2+ metal ions in industrial used water. The activated carbon was prepared from pineapple crown waste. Pineapple crown was pre-carbonized at 180oC for 1 hours. Chemical activation was done using KOH with variations in concentrations of 2, 3, and 4 M. The samples were irradiated by using a microwave at 630 Watt of output power for 15 minutes. KOH activation and microwave irradiation power were influenced to the physical properties of the samples. Activated carbon obtained were characterized using SEM, EDX, FTIR and AAS. The results showed that highest adsorption were obtained from activated carbon that was activated by KOH 2 M. Adsorption efficiency for Pb2+ and Cu2+ metals were 81.15% and 49.71%, respectively. The carbon chain structure shows the functional groups C-H, C≡C, O-H, C=C at wavenumber 2889.49 cm-1, 2360.97 cm-1, 2339.97 cm-1.

DETEKSI EFEK GEMPABUMI PADA IONOSFER MENGGUNAKAN DATA GNSS

Seismic activities such as earthquakes can cause atmospheric and infrared gravitational waves. If the earthquake happens to be strong enough (M> 6 SR), these waves can spread to the ionosphere altitude in the form of atmospheric and infrasonic gravitational waves. The monitoring system of ionospheric wave that associated with earthquakes from network of GNSS data has been much developed in Indonesia by using the sliding Fast Fourier Transform (SFFT) programfor disturbed ionospheric TEC positions. The results of previous studies, differential TEC showed irregular fluctuations in the order of several tens of seconds until to several tens of minutes with average amplitude less than 0.01 TECU. At times the ionospheric is not disturbed (regular), the amplitude can reaching greater than 0.01 TECU. As a case study, in this paper a methodological examination will be conducted on the events of Aceh earthquake on December 26, 2004 (M = 9.2 SR), Tohoku March 11, 2011 (M = 9 SR) and Yogyakarta May 27, 2006 (M = 6.2 SR).