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All Journal Jurnal Fisika dan Pembelajarannya Wahana Fisika : Jurnal Fisika dan Terapannya Jurnal Sains Dasar Widyariset INDONESIAN JOURNAL OF APPLIED PHYSICS Widyariset Makara Journal of Science
Denny Darmawan
Universitas Negeri Yogyakarta
Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics

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Interpretasi Struktur Bawah Tanah pada Sistem Sungai Bribin dengan Metode Geo Aziz, Khafidh Nur; Sumardi, Yosaphat; Darmawan, Denny; Wibowo, Nugroho Budi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 6, No 01 (2016): IJAP VOLUME 06 ISSUE 01 YEAR 2016
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v6i01.1796

Abstract

This research was aimed to determine the distribution pattern of magnetic field anomaly and to identify the lithology of underground structure in Bribin Karst using geomagnetic method. Research location was Semanu Sub-district, Gunungkidul Regency at UTM coordinate of 464061 mT-464929 mT and 9111097 mU-9111970 mU. The data were taken using G-5 Proton Precession Magnetometer (PPM) by looping method. The result showed that the distribution pattern of the magnetic field anomaly in Karst Bribin has value of 330 nT - 530 nT and anomaly values reflecting the system of Bribin River has value of 400 nT-460 nT. The lithology of underground structure in Karst Bribin has susceptibility value of -0.069 (in SI) - 0.0661 (in SI) with depth 200 m associated with limestone, tuff, gypsum, rock salt, and minerals calcite and anhydrite and the lithology associated with the system of Bribin River has susceptibility value -0.069 (in SI) associated with gypsum, rock salt, and minerals anhydrite.
IDENTIFIKASI DAERAH LONGSOR KECAMATAN BAGELEN MENGGUNAKAN METODE MIKROTREMOR Petiwi, Gofur Dyah Ayu Gilang; Wibowo, Nugroho Budi; Darmawan, Denny
Wahana Fisika Vol 3, No 2 (2018): December
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/wafi.v3i2.12740

Abstract

Kecamatan Bagelen merupakan wilayah di sisi barat Pegunungan Menoreh yang mengalami tanah longsor akibat adanya perubahan kondisi geologi menjadi material lepas dan terlongsorkan. Penelitian ini bertujuan untuk mengetahui karakteristik daerah longsor di Kecamatan Bagelen berdasarkan persebaran dan pemodelan parameter mikrotremor, yaitu frekuensi predominan, faktor amplifikasi, ketebalan lapisan sedimen, dan indeks kerentanan seismik. Data mikrotremor diolah dengan metode HVSR dan metode Ellipticity Curve. Hasil penelitian menunjukkan bahwa nilai  daerah longsor adalah 6-8 Hz, nilai  adalah 6-7, dan nilai  adalah 5×10−4 - 1,1×10−3 s2/m. Ketiga parameter tersebut berada dalam kategori sedang hingga tinggi serta nilai ketebalan sedimen 20-50 m.Bagelen District located in the west of Menoreh Mountain that had landslide caused by deformation. The research aimed to characterize the landslide area in Bagelen District based on microtremor parameters: predominant frequency, amplification factor, sediment layer thickness, and seismic vulnerability index. Data in the form ofmicrotremor signals were then processed by HVSR and ellipticity curve method. The results of the research showed that the value of 𝑓0 ranged from 6 to 8 Hz, the value of 𝐴 ranged from 6 to 7, the value of 𝐻 ranged from 20 to 50 m and the value of 𝐾𝑔 ranged from 5×10−4 - 1,1×10−3 s2/m. The parameter was on medium and high categories with 20 - 50 m sediment layer thickness.
Model Development of NIÑO 3.4 and Indian Ocean Dipole (IOD) Anomalies Teleconnection Saputra, Antonni; Hermawan, Eddy; Darmawan, Denny
Jurnal Sains Dasar Vol 7, No 2 (2018): October 2018
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v7i2.38551

Abstract

The purpose of this research is to develop the teleconnection model of Niño 3.4 and IOD anomalies which can be used as reference to explain precipitation anomalies. El-Niño and IOD cycles are shown as the warming process of sea surface temperatures where for El-Niño is in the Pacific Ocean and IOD is in the Indian Ocean and each of them forms a cycle over a certain period of time. The method used to determine the dominant oscillation of the teleconnection of Niño 3.4 and IOD anomalies is Power Spectral Density (PSD), and to model the teleconnection of Niño 3.4 and IOD anomalies is ARIMA (Autoregressive Integrated Moving Average). The data used are Niño 3.4 index which is one type of index for El-Niño and IOD index. The results are Power Spectral Density (PSD) graphs for the teleconnection of Niño 3.4 and IOD anomalies which oscillates around 5 years. By the ARIMA method, the approximate model for the data of teleconnection of Niño 3.4 and IOD is ARIMA (1,1,2) with equation of Zt = 1.516  Zt-1 - 0.516 Zt-2 - 0.256 at-1 + 0.021 at-2.
Kajian Sistem Terfrustasi pada Bahan Antiferromagnet dengan Model Ising 2D R. N. Safitri; A. R. U. Fadilah; Denny Darmawan; R. Y. A. Sari
Jurnal Sains Fisika dan Terapannya Vol 1
Publisher : Jurnal Sains Fisika dan Terapannya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1311.176 KB)

Abstract

Penelitian ini bertujuan untuk mensimulasikan energi dasar dan magnetisasi bahan antiferromagnet dengan pengaruh suhu dan nilai kompetisi interaksi. Kompetisi interaksi terjadi antara tetangga terdekat dengan tetangga terdekat berikutnya. Penyelesaian kasus antiferromagnet berikut menggunakan model Ising dua dimensi dengan metode Monte Carlo. Hasil penelitian menunjukkan bahawa energi dasar mengalami peningkatan secara signifikan pada suhu kritis (suhu Neel). Semakin besar kompetisi interaksi, energi dasar pada suhu awal mengalami penurunan. Berdasarkan nilai magnetisasi, bahan antiferromagnet yang terfrustasi mengalami perubahan fase menjadi paramagnet ketika suhunya dinaikkan. Dengan memperbesar kompetisi interaksi, perubahan fase terjadi pada suhu Neel yang lebih tinggi.
Density Profiles, Energy, and Oscillation Strength of a Quantum Dot in Two Dimensions with a Harmonic Oscillator External Potential using an Orbital-free Energy Functional Based on Thomas–Fermi Theory Alfarisa, Suhufa; Dwandaru, Wipsar Sunu Brams; Darmawan, Denny
Makara Journal of Science
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This research aims i) to determine the density profile and calculate the ground state energy of a quantum dot in two dimensions (2D) with a harmonic oscillator potential using orbital-free density functional theory, and ii) to understand the effect of the harmonic oscillator potential strength on the electron density profiles in the quantum dot. This study determines the total energy functional of the quantum dot that is a functional of the density that depends only on spatial variables. The total energy functional consists of three terms. The first term is the kinetic energy functional, which is the Thomas–Fermi approximation in this case. The second term is the external potential. The harmonic oscillator potential is used in this study. The last term is the electron–electron interactions described by the Coulomb interaction. The functional is formally solved to obtain the electron density as a function of spatial variables. This equation cannot be solved analytically, and thus a numerical method is used to determine the profile of the electron density. Using the electron density profiles, the ground state energy of the quantum dot in 2D can be calculated. The ground state energies obtained are 2.464, 22.26, 90.1957, 252.437, and 496.658 au for 2, 6, 12, 20, and 56 electrons, respectively. The highest electron density is localized close to the middle of the quantum dot. The density profiles decrease with the increasing distance, and the lowest density is at the edge of the quantum dot. Generally, increasing the harmonic oscillator potential strength reduces the density profiles around the center of the quantum dot.
THE OCEAN CURRENT PATTERN AND WATER MASS CHARACTERISTIC IN THE RESPONSE OF CLIMATE EVENTS ON THE NORTHWESTERN SUMATRA WATER Khikmah Muliati; Ahmad Bayhaqi; Kautsar Fadlih Akbar; Denny Darmawan; Nurhayati Nurhayati
Widyariset Vol 8, No 1 (2022): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.7.1.2022.9 - 18

Abstract

El Nino lemah dan positif Indian Ocean Dipole (pIOD) yang diikuti La Nina moderat dan negatif Indian Ocean Dipole (nIOD) pada tahun 2017 memberikan pengaruhnya terhadap kondisi pantai barat laut Sumatera. Penelitian untuk menganalisis hal tersebut dilakukan menggunakan RV Baruna Jaya VIII pada Desember 2017. Pelayaran ini bertujuan menganalisis pengaruh perubahan iklim terhadap pola arus laut dan karakteristik massa air. Data hidrografi dari pelayaran tersebut didukung oleh data satelit altimetri suhu permukaan laut (SST), data anomali angin yang bersumber dari The European Centre for Medium-Range Weather Forecasts (ECMWF), dan data arus yang bersumber dari Ocean Surface Current Analysis Real-Time. Hasil penelitian menunjukkan adanya warmer sea surface temperature saat fenomena weak El Nino diikuti positive IOD (pIOD) and cooler sea surface temperature saat fenomena moderat La Nina diikuti negative IOD (nIOD). Karakteristik massa air yang diamati pada lapisan atas maupun tengah bersumber dari perairan Samudera Hindia. Data arus mendukung hal tersebut dengan menunjukkan bahwa arus pada bulan Desember bergerak dari barat sebagai bagian dari musim barat dan pengaruh dari Wyrtki Jets.
THE OCEAN CURRENT PATTERN AND WATER MASS CHARACTERISTIC IN THE RESPONSE OF CLIMATE EVENTS ON THE NORTHWESTERN SUMATRA WATER Khikmah Muliati; Ahmad Bayhaqi; Kautsar Fadlih Akbar; Denny Darmawan; Nurhayati Nurhayati
Widyariset Vol 8, No 1 (2022): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.7.1.2022.9 - 18

Abstract

El Nino lemah dan positif Indian Ocean Dipole (pIOD) yang diikuti La Nina moderat dan negatif Indian Ocean Dipole (nIOD) pada tahun 2017 memberikan pengaruhnya terhadap kondisi pantai barat laut Sumatera. Penelitian untuk menganalisis hal tersebut dilakukan menggunakan RV Baruna Jaya VIII pada Desember 2017. Pelayaran ini bertujuan menganalisis pengaruh perubahan iklim terhadap pola arus laut dan karakteristik massa air. Data hidrografi dari pelayaran tersebut didukung oleh data satelit altimetri suhu permukaan laut (SST), data anomali angin yang bersumber dari The European Centre for Medium-Range Weather Forecasts (ECMWF), dan data arus yang bersumber dari Ocean Surface Current Analysis Real-Time. Hasil penelitian menunjukkan adanya warmer sea surface temperature saat fenomena weak El Nino diikuti positive IOD (pIOD) and cooler sea surface temperature saat fenomena moderat La Nina diikuti negative IOD (nIOD). Karakteristik massa air yang diamati pada lapisan atas maupun tengah bersumber dari perairan Samudera Hindia. Data arus mendukung hal tersebut dengan menunjukkan bahwa arus pada bulan Desember bergerak dari barat sebagai bagian dari musim barat dan pengaruh dari Wyrtki Jets.
Co-Authors A. R. U. Fadilah Ahmad Bayhaqi Alfarisa, Suhufa Aziz, Khafidh Nur Eddy Hermawan Kautsar Fadlih Akbar Khikmah Muliati Nugroho Budi Wibowo Nurhayati Nurhayati Petiwi, Gofur Dyah Ayu Gilang R. N. Safitri R. Y. A. Sari Saputra, Antonni wipsar sunu brams dwandaru Wipsar Sunu Brams Dwandaru Yosaphat Sumardi