Yusuf Dewantoro, Yusuf
Teknik Konservasi Energi, Politeknik Negeri Semarang, Semarang

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INTERPRETASI GEOLOGI BAWAH PERMUKAAN DAERAH POTENSI MATA AIR PANAS KALIULO KABUPATEN SEMARANG BERDASARKAN DATA GEOMAGNET MENGGUNAKAN MODEL 2-D & 3-D Rahayu, Diny Agustina; Harmoko, Udi; Yulianto, Tony; Widada, Sugeng; Dewantoro, Yusuf
YOUNGSTER PHYSICS JOURNAL Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The geothermal hot springs has been discovered in the Kaliulo area, Pringapus district of Semarang Regency. The research was conducted by 2-D and 3-D model geomagnetic for find the geological subsurface structure. Observation data such as magnetic field of 61 point used one set of PPM (Proton Precission Magnetometer) GSM geometrics 19 T and two units Geotron Magnetometer Model Unit G5. Data analysis of geomagnet was undertaken by diurnal correction and IGRF (International Geomagnetic Reference Field) correction to obtain the total of magnetic field anomalies. The total magnetic field anomaly data were utilized to create anomaly contour. That anomaly is used for doing reduction to plansurface process, upward continuation that produce anomalies local and regional, and reduction to pole. Modeling was done on the local magnetic anomalies to review subsurface using Mag2DC and UBC Mag3D. The results showed the + (positive) closure and – (negative) closure that can indicate anomalies object in other word to be weak zone or geological structure of fault is available, so that the slicing is made on that closure. Based on the model 2-D normal fault structure the northwestsoutheast trending and northeast-southwest, this interpreting so that normal faults which controlled source hot springs Diwak to Kaliulo.  
ANALISIS STRUKTUR BAWAH PERMUKAAN DAERAH HARJOSARI KABUPATEN SEMARANG MENGGUNAKAN METODE GEOMAGNET DENGAN PEMODELAN 2D DAN 3D Widodo, Mars; Yulianto, Tony; Harmoko, Udi; Yulianto, Gatot; Widada, Sugeng; Dewantoro, Yusuf
YOUNGSTER PHYSICS JOURNAL Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research of analysis subsurface structure in Harjosari Semarang district using geomagnet methods with 2D and 3D modelling. In this study, magnetic data acquisition was carried out in 93 points by using a PPM (Proton Precession Magnetometer) geometrics type of GSM 19T and 2 units geotron magnetometer G5 models to get the values of the total magnetic field. The result of measurement data is processed by the daily variation correction and IGRF correction (International Geomagnetic Reference Field). The corrected data has been used to create total magnetic anomaly contour. The total magnetic anomaly contour has been used to process reduction to plan surface. The result of reduction to plan surface has been used to create a contour upward continuation and then made reduction to the poles. The result of research showed the total magnetic anomaly closure pair of positive and negative indicated a fault zone below the surface. Result of research an incision on the closure pair of positive and negative to determine the subsurface structure of the region by creating a model of 2-dimensional (2D) using software Mag2DC. In 2D modeling result shows that was a fault zone below the surface about 210 to 1000 meters depth. The existence of the fault structure below the surface was estimated as a result of rock shifting from the northeastern area of research. Result of a 3-dimensional (3D) modelling using UBCMag3D software to determine subsurface structures more clearly by including error values, parameter values susceptibility and density models. On the results of the 3D display of subsurface structures found any difference in stark contrast to the susceptibility value at a depth of 225 meters to 1200 meters. The susceptibility value differences suspected presence of fault structures below the surface.
PEMODELAN INVERSI ANOMALI MAGNETIK 3D DAERAH MATA AIR PANAS DIWAK DAN DEREKAN Zulaikhah, Siti; Harmoko, Udi; Yulianto, Tony; Yulianto, Gatot; Widada, Sugeng; Dewantoro, Yusuf
YOUNGSTER PHYSICS JOURNAL Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research of magnetic methods that aim to interpretation the subsurface structure around the hot springs area Diwak and Derekan and to identification caused of hot springs Diwak and Derekan has been successfully carried out. In this research, measurements were taken at 97 points using a proton precession magnetometer (PPM) type of GSM model 19T geometrics and two Geotron Magnetometer G5 models to get the value of the total magnetic field. Measurement data is processed by the daily variation correction and correction IGRF (International Geomagnetic Reference Field) to get the value of the total magnetic field anomaly. Corrected data used to create contours of the total magnetic field anomaly. Contour total magnetic field anomaly is used for the reduction to plan surface process and upward continuation process. The results of the upward continuation get the contours of local anomaly and regional anomaly, the results of the local anomaly contour then reduced to the pole. Results of the research is a pair of positive and negative closure indicate a fault structure below the surface. There are two pairs of positive and negative closure which an incision is made to determine the subsurface structure by creating a 2D model using the software Mag2dc. 2D modeling results indicate the existence of a second incision fault structure in the form of down trending fault southwest-northeast. Meanwhile, to make 3D models using software Mag3D and 3D modeling results indicate the presence of fault structures below the surface. Fault zone results of 2D and 3D modeling is a media outlet fluid to the surface in the form of hot springs Diwak and Derekan.
DESAIN DAN IMPLEMENTASI VOLTAGE-SOURCE INVERTER (VSI) TIGA FASE UNIFORM PULSE-WIDTH MODULATION (UPWM) DENGAN DSPIC30F4011 Dewantoro, Yusuf; Facta, Mochammad; Setiawan, Iwan
Transmisi Vol 19, No 2 April (2017): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

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Abstract

Di Indonesia, energi listrik umumnya dibangkitkan sebagai sumber listrik tiga fase. Akan tetapi karena tidak semua pelanggan berada dalam jalur distribusi tiga fase, permintaan kebutuhan sumber tiga fase tidak semua bisa dipenuhi, karena itu dibutuhkan inverter tiga fase. Inverter tiga fase yang baik memiliki teknik switching yang halus dengan karakteristik harmonisa rendah. Pada umumnya, sinyal UPWM tiga fase secara digital sulit dibangkitkan, karena keterbatasan fitur mikrokontroller yang ada. DsPIC30f4011 adalah mikrokontroller yang terspesifikasi untuk keperluan pengontrolan motor dengan fitur khusus yang mendukung pembangkitan sinyal UPWM tiga fasa, diantaranya pengaturan dead time, complementary mode dan center aligned mode. Dalam penelitian ini, dirancang VSI tiga fasa dengan teknik pemicuan UPWM berbasis mikrokontroller 16-bit dsPIC30f4011. Sinyal carrier dirancang 10 kHz dengan indeks modulasi (ma) dapat diatur pada rentang nilai 0 ≤ ma ≤ 1 dan frekuensi sinyal referensi pada nilai 0 – 50 Hz. Diperoleh performa handal, dimana sinyal UPWM yang dibangkitkan sudah sesuai dengan karakteristik sinusoidal. Bentuk gelombang tegangan output VLL dapat divariasikan secara linier terhadap indeks modulasi pada rentang frekuensi 0 – 50 Hz. Nilai PVUR dan IUR (rasio ketidakseimbangan tegangan dan arus) yang dihasilkan sudah memenuhi standar NEMA, yaitu dibawah 2%.