Tony Yulianto
Departemen Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang

Published : 66 Documents
Articles

Identifikasi Struktur Lapisan Bawah Permukaan Daerah Manifestasi Emas Dengan Menggunakan Metode Magnetik Di Papandayan Garut Jawa Barat Arifan Kahfi, Rian; Yulianto, Tony
BERKALA FISIKA Vol 11, No 4 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A geophysical investigation has been done using magnetics method at Papandayan, Garut, West Java. The aims of this research are to interpret the sub-surface geology structure at Papandayan based on 2D modelling and geological information. Raw data processing was performed using IGRF (International Geomagnetics Reference Field) and diurnal variation correction to obtain total field magnetic anomaly. Upward continuation was performed at 150 meters height above reference spheroide for total field anomaly. Reduction to pole was performed to simplify interpretation process. Data acquired using Proton Precession Magnetometer (PPM) and Global Positioning System (GPS) Garmin during 3 days, which cover an area of 600 meter x 1100 meter and measurement spacing was 5 meter. Qualitative interpretation were done by upward continuation total field magnetic anomaly maps. While quantitative interpretation was done by 2D modelling by slicing upward continuation total field magnetic anomaly maps using Geomodel. It is interpreted that Papandayan sub-surface geology structure was controlled by tuff rock with susceptibilities 1 x 10-5 in emu system, andesite rock with susceptibilities 0.0135 in emu system, porphyry rock 0.010 in emu system, intrusion rock with susceptibilities 0.013 in emu system, sedimentary rock with susceptibilities 7 x 10-5 in emu system, and sedimentary rock with susceptibilities 8 x 10-5 in emu system. Porphyry rock as gold prospect is interpreted as alteration zone of silisification. Keyword: magnetics, gold, Papandayan.
Identifikasi Penyebaran Dan Ketebalan Batubara Menggunakan Metode Geolistrik Resistivitas Yulianto, Tony; Widodo, Sugeng
BERKALA FISIKA Vol 11, No 2 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A Geoelectricity survey using Schlumberger configuration has been conducted in area X of Muara Muntai district, Kutai Kertanegara dictric East Borneo using Schlumberger configuration to probe the existence of coal. Modeling using matching curve to describe subsurface in X area base on 11 points sounding from field data acquisition The result indicates that the coal is within the depth of 60m-70m with a thickness of 1m-2m. Whereas the value of coal resistivity is in the reach 90 Ώm-120 Ώm. It can be then concluded that area X is not prospecting to exploitation.   Keyword: Schlumberger configuration, coal, resistivity
Penggambaran Pseudosection Bawah Permukaan dari Suatu Proses Evapotranspirasi Tanaman Jagung Menggunakan Program RES2DINV Suroso, Teguh; Yulianto, Tony; Yulianto, Gatot
BERKALA FISIKA Vol 9, No 3 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The dipole-dipole investigation of one line corn crop subsurface condition have been done in relationship with evapotranspiration process. The variation of subsurface resistivity investigation occured by the caused of evapotranspiration process.The space of dipole-dipole array measured in 0,20 meter and 0,40 meter with n value  from 1 to 4. In May 21st,24th,28th,31st 2005 the dipole-dipole array was measured. The electrodes and  corn crop-line  possition is parallel. The depiction of subsurface condition viewed by using the Res2Dinv apparent resistivity data. The depiction showed the high resistivity of the corn crop area and the transpiration process is higher than evaporation process. Anomaly resistivity value in the pseudosection output  is 54,30 Wm. Keywords: dipole-dipole, evapotranspiration, resistivity
Rancang Bangun Sistem Pengukur Konduktivitas Larutan Elektrolit Menggunakan Mikrokontroler AT89C51 Sumariyah, Sumariyah; Yulianto, Tony; Priyono, Jumadi
BERKALA FISIKA Vol 9, No 3 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A system of electrolyte conductivity measurement has been designed and realized using microcontroller AT89C51. The system run at the frequency 2.5 Mhz. The adventage of the system is conductivity sensor placed outside the sample liquid. The input of system is NaCl concentration  and the output is conductivity value.The hardware of this system is built by a conductivity sensor, oscillator      XR-2206, a frequency synthesizer IC CMOS 4046, an operational amplifier LM358, an analog to digital converter ADC 0804, a liquid crystal display Seiko M1632, and a microcontroller AT89C51. To control this electrolyte liquid conductivity measurement was used macro assembler machine language.The results of the experiment show that the test of variable oscillator function has linear regression equation Y = 0.56 X + 1.96, amplification of LM358 amplifier test is 3.39 and has linear regression equation Y = 3.28 X + 0.05, ADC0804 conversion function has linear regression equation Y = 51.29 X + 9.97. The test of measurement system was sown that instrument able to measure NaCl conductivity from 0.2 M until  2.0 M with linear regression equation  Y =  67,63x + 6,37.
Pengelompokan Optimal Kabupaten dan Kota Rawan Kriminalitas di Jawa Timur dengan Metode Analisis Kluster Terbaik Mardianto, M. Fariz Fadillah; Kuzairi, Kuzairi; Yulianto, Tony; Amalia, Rica; Faisol, Faisol
Zeta - Math Journal Vol 1 No 1 (2015): Mei 2015
Publisher : Universitas Islam Madura

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Abstract

Kriminalitas adalah kejadian melanggar hukum yang menganggu keamanan di suatu wilayah. Tingginya tingkat kriminalitas dapat menghambat mobilitas masyarakat dan investor. Kegiatan perekonomian, perdagangan, dan pendidikan dapat terganggu di suatu daerah yang dikategorikan sebagai daerah rawan jika keamanan tidak dijamin. Akhir-akhir ini isu kriminalitas menjadi topik yang menarik di Jawa Timur. Jawa Timur dengan luas wilayah yang besar, jumlah penduduk yang banyak dan beragam, serta pembangunan yang pesat memiliki probabilitas tinggi dalam hal kriminalitas. Pengelompokan daerah rawan kriminalitas perlu dilakukan. Dalam penelitian ini pengelompokan daerah rawan kriminalitas dilakukan dengan metode analisis kluster hierarki diantaranya single linkage, complete linkage, average linkage, dan metode ward, serta analisis kluster non hierarki dengan menggunakan metode k-means. Jumlah kluster optimal untuk tiap metode ditentukan dengan statistik Pseudo-F terbesar. Setelah mendaapatkan jumlah kluster optimal dengan Pseudo-F, langkah selanjutnya adalah menentukaan metode analisis kluster yang terbaik dengan melihat nilai internal cluster dispersion rate (icdrate). Semakin kecil nilai icdrate, semakin baik metode tersebut dalam melakukan pengelompokan. Setelah dilakukan pengelompokan didapatkan hasil lima kelompok yang optimal berdasarkan metode ward dimana terdapat lima kategori daerah  dengan tingkat kriminalitas sangat rawan, rawan, sedang, aman, sangat aman. Berdasarkan hasil analisis kluster dua wilayah disarankan untuk mendapatkan keamanan khusus yaitu Kota Surabaya yang merupakan daerah sangat rawan kriminalitas , dan Kota Malang dengan kategori rawan kriminalitas. Kedua daerah ini merupakan dua kota terbesar di Jawa Timur.
Penerapan Metode Beda Hingga pada Model Matematika Aliran Banjir dari Persamaan Saint Venant Hasan, Hasan; Yulianto, Tony; Amalia, Rica; Faisol, Faisol
Zeta - Math Journal Vol 2 No 1 (2016): Mei 2016
Publisher : Universitas Islam Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (322.254 KB) | DOI: 10.31102/zeta.2016.2.1.6-12

Abstract

Banjir merupakan suatu kejadian yang ditandai dengan naiknya muka air melebihi volume tampung air semisal sungai atau saluran air. Adapun banjir itu sering terjadi salah satunya di Indonesia karena Indonesia merupakan Negara tropis dan beberapa daerah pun juga air resapan sudah mulai berkurang. Dalam penelitian ini diselesaikan dari model matematika aliran banjir pada persamaan saint venant menggunakan metode Beda Hingga. Adapun hasil penelitian didapatkan suatu ketidakstabilan banjir yaitu dengandihasilkannya grafik yang yang terbentuk tidak menuju satu garis y artinya tidak menuju satu titik.
PENGGUNAAN METODE GEOLISTRIK RESISTIVITAS 3-DIMENSI UNTUK MENGETAHUI SEBARAN LIMBAH DI TPA JATIBARANG KOTA SEMARANG Prapitari, Aspia; Yulianto, Tony
YOUNGSTER PHYSICS JOURNAL Vol 2, No 3 (2013): Youngster Physics Journal Juli 2013
Publisher : YOUNGSTER PHYSICS JOURNAL

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The waste distribution in TPA of Jatibarang in Semarang has measured and interpreted using resistivity geoelectric 3-D method with pole – pole configuration.Field data has processed using Res3dinv program which gives horizontal and vertical cross section as the result. The result of res3dinv is entered to RockWork software to obtain 3-D cross section. The result of RockWork software could describe the waste distribution in TPA of Jatibarang.The research result shows that the direction of waste distribution in TPA of Jatibarang which has resistivity range 21,5 Ωm – 39,2 Ωm is to East – South which is to Kreo river. Key words : Resistivity geoelectric 3-D, Garbage dump waste, Pole – pole configuration, Res3dinv, RockWork 
PEMODELAN STRUKTUR BAWAH PERMUKAAN DAERAH SESAR JIWO KLATEN DENGAN METODE MEDAN MAGNET TOTAL Roismanto, Irfan; Yulianto, Tony
YOUNGSTER PHYSICS JOURNAL Vol 2, No 2 (2013): Youngster Physics Journal April 2013
Publisher : YOUNGSTER PHYSICS JOURNAL

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Abstract

This study, using the method of total magnetic field in the area of ​​Central Java Klaten, aims to interpret the subsurface structure of the fault zones surrounding Prambanan, Wedi, and Gantiwarno district that became the suspect of the aftershocks cause occurring on May 27, 2006. The total magnetic field measurements use GSM19T Series magnetometre with the accuracy of ± 0.5 nT which includes 158 points. From the interpretation result using the second vertical derivative analysis, it can be known that there are three fault areas which are categorised as normal faults. The first fault is found in the volcanic rocks composed by the layers of volcanic breccia, lava and tuff. It is characterised by a change in the susceptibility value from 0.3 to 0.2 cgs. The second section is in Kebo Butak rock formation comprising the layers of sandstone, clay, silt, and algomerat. It is characterised by changes on the susceptibility values from 0.126 to 0.007cgs and from 0.33 0.126 cgs. The last fault is located in the Semilir formation consisting of tuff rocks, pumice breccias and tuffaceous sandstone marked by changes on the susceptibility values ​​from 0.25 to 0.1 cgs and from 0.5 to 0.25 cgs. Keywords: jiwo fault, total magnetic field, klaten
Interpretasi Bawah Permukaan Daerah Manifestasi Panas Bumi Parang Tritis Kabupaten Bantul DIY Dengan Metode Magnetik Indratmoko, Putut; Nurwidyanto, M. Irham; Yulianto, Tony
BERKALA FISIKA Vol 12, No 4 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract                 Acquisition of geomagnetic field has been done at Kretek, Sanden, Pundong, Bantul and Panggang, Gunung Kidul, Yogjakarta Province on 14 s/d 17 October and  7,8,9,12 November 2009 in orde to interpreted the subsurface structure. Data has been collected by Proton Precession Magnetometer (PPM) to measured  the total  intensity of magnetic field, Global Positioning System (GPS) to determine the position and geology compass to the direction of north pole.                 The raw data has been processed and performed using IGRF (International Geomagnetics Reference Field) correction to obtain total field magnetic anomaly. Upward continuation was performed at 300 meters heigh by Magpick. Qualitative interpretation was done by analyzing regional and local anomaly maps. Quantitative interpretation was done 2 ½ D modelling cross-sectionanomaly maps using Mag2DC for Windows Software.     The result of 2-D modeling produces anomaly objects was susceptibility value (0,0405) in cgs unit  for the first object, susceptibility value (0,0425) in cgs unit  for the second object, susceptibility value (-0,0085) in cgs unit for the third object. The anomaly objects had depth in +580 meters from the surface and was considered the rock which had been experience demagnetitation proses.    Key word: magnetic anomaly, Parangtritis, susceptibilities.
APLIKASI METODE GEOLISTRIK TAHANAN JENIS UNTUK MENENTUKAN ZONA INTRUSI AIR LAUT DI KECAMATAN GENUK SEMARANG Nisa, Khoirun; Yulianto, Tony; Widada, Sugeng
BERKALA FISIKA Vol 15, No 1 (2012): Berkala Fisika
Publisher : BERKALA FISIKA

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An interpretation has been conducted to the salt water spreading in the district of Semarang city Genuk area by the geoelectrical method of resistivity using Schlumberger electrode configuration.Acquisition of field data were processed using Ip2win program whose results are used to describe the resistivity cross-section area of research. Resistivity cross-section was combined with thedistribution of groundwater sanility from electrical conductivity value approach to determine thezoning of sea water intrusion in the study area.Zone of sea water intrusion in the district of Semarang city Genuk are consist regionKarangroto and Sembungharjo starting from a depth of 80 meters, Bangetayu west starting from adepth of 100 meters, 140 meters depth Genuksari start, and Trimulyo ranging from a depth of 200meters with values of electrical conductivity 16.550 Ωm.Key Words : Geo-electrical, sea water intrusion