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INDONESIAN JOURNAL OF APPLIED PHYSICS

ijap
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Published by Universitas Sebelas Maret

ISSN : 20890133 EISSN : 24776416 DOI : -

Core Subject : Science,

Astronomy Energy Materials Science & Nanotechnology Physics

Indonesia Journal of Apllied Physics provides rapid publication of short reports and important research in all fields of physics. Indonesia Journal of Apllied Physics publishes articles that are of significance in their respective fields whilst also contributing to the disclipline of physics as a whole. Articles should be submitted to the Editorial Office of Indonesia Journal of Apllied Physics through this site. Further information on submission is also available at this site

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Articles 267 Documents

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Karakteristik Briket Bioarang dari Campuran Limbah Baglog Jamur Tiram (Pleurotus Ostreatus) dan Sekam Padi Fatwa Aji Kurniawan; Ahmad Aftah Syukron
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 02 (2019): IJAP Volume 9 ISSUE 02 YEAR 2019
Publisher : Department of Physics, Sebelas Maret University

Kebijakan diversifikasi energi yang dikeluarkan Pemerintah Indonesia menuntut masyarakat untuk menemukan bahan bakar selain fosil. Penelitian ini bertujuan untuk menghasilkan briket dari campuran arang limbah baglog jamur tiram (JT) dan arang sekam padi (SK) yang berkualitas sehingga dapat digunakan sebagai bahan bakar alternatif. Penelitian ini secara garis besar dilakukan dalam tiga tahap yaitu pengarangan atau karbonisasi, pembriketan dan pengujian kualitas briket. Variabel yang digunakan dalam penelitian ini adalah komposisi campuran JT dan SK. Komposisi campuran yang digunakan yaitu 100% JT:0% SK untuk sampel A, 75% JT:25% SK untuk sampel B, 50% JT:50% SK untuk sampel C, 25% JT:75% SK untuk sampel D dan 0% JT:100% SK untuk sampel E. Dari hasil penelitian disimpulkan bahwa campuran yang paling optimal untuk mendapatkan briket berkualitas baik yaitu dengan komposisi 50% arang limbah baglog jamur tiram : 50% arang sekam padi dimana diperoleh nilai kalor sebesar 3541 kal/gr, kadar air 1.57% dan kadar abu 36.20%.

Vertical Electrical Sounding Analysis for Local Subsurface Water Bearing Identification Due to Isolated Hill. Case-study: Madurejo Village, Prambanan District, Yogyakarta Province, Indonesia Eddy Hartantyo
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 01 (2020): IJAP Volume 10 ISSUE 01 YEAR 2020
Publisher : Department of Physics, Sebelas Maret University

In a subsurface aquifer, there is a ‘barrier like’ phenomenon that blocks the flow of water. It will create a subsurface water bearing/dam and potential source for water well drilling. The existence of clay-limestone in the isolated hill in Madurejo village, Prambanan district, Yogyakarta seems to act like a natural groundwater body which is interesting to be analyzed by means of vertical electrical sounding (VES). For this purpose, three VES points measured with 150 meters apart, creating a line from south to north. Maximum distance for AB is 200 meters. We found the shallow unconfined from surface to 4 m depth and confined aquifers from 6 m to 29 m. The geometry of the second aquifer in combination with the existence of isolated hill seems to have a water-bearing structure which is very potential for water resources.

Study of First Principles of Mg-Si Binary Systems as Precipitates from T6 Heat Treatment of AL-MG-SI ALLOYS Deni Haryadi; Haris Rudianto
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 01 (2020): IJAP Volume 10 ISSUE 01 YEAR 2020
Publisher : Department of Physics, Sebelas Maret University

One of the purposes adding the two main alloying elements Si and Mg in small quantities (≈ 1%) on Aluminum is to form strengthening precipitates in aluminium alloy, which typically contribute with a fivefold strength increase from pure aluminum. In the last decades, the investigation has begun to understand the structure and formation of the different phases during heat treatment. An important precipitate in Al-Mg-Si Alloy is β" and β. when the Precipitate β is created after β" is that the strength suddenly drops and the alloy is said to be overaged. By means of a first-principles supercell approach and density functional theory calculations, this research studied precipitate energy and interface energy of precipitate β" and β. Results show that precipitate β have precipitate energy higher then β" but have interface energy lowers then β". And each low energy interface was found possesses interface with the Al matrix is fully incoherent. The final result of calculation and simulation values for the interfacial energies, precipitate energies and strain energies that can be used in future predictions of the characteristic precipitate.

Rancang Bangun Sistem Ultrasound Assisted Extraction (UAE) dengan Otomasi Pengaturan Suhu dan Volume Pelarut Humairoh Ratu Ayu; Suryono Suryono; Jatmiko Endro Suseno
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 01 (2020): April
Publisher : Department of Physics, Sebelas Maret University

Pada penelitian ini telah dilakukan rancang bangun sistem pengaturan suhu dan volume pelarut pada ultrasound assisted extraction. Sistem ini terdiri dari pompa, mikrokontroler, termocouple, termocontroller dan sensor suhu LM35 yang bertujuan untuk menghindari pengenceran ekstrak dan meningkatkan transfer massa sehingga mendapatkan hasil ekstraksi yang lebih baik. Pompa menyala sesuai dengan perintah yang diberikan ke mikrokontroler selanjutnya dilakukan pembacaan nilai ADC oleh sensor suhu LM35 yang kemudian dikonversi ke dalam nilai temperatur. Berdasarkan hasil penelitian yang telah dilakukan, sistem mampu mengontrol volume pelarut dengan nilai error sebesar 2,38%, memantau suhu dalam wadah ekstraksi menggunakan sensor suhu LM35 dengan nilai error sebesar 0,70% dan mengontrol suhu menggunakan termokontroler dengan kestabilan sistem sebesar 96,16%.

Effect of CaCO3 Particles Size and Content on Impact Strenght of Kenaf/CaCO3/Epoxy Resin Hybrid Composites Harini Sosiati; Cahyo Trisedyo Utomo; Iwan Setiono; Cahyo Budiyantoro
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 01 (2020): April
Publisher : Department of Physics, Sebelas Maret University

Thermoplastic and thermoset polymer composites reinforced with kenaf fiber or CaCO3 have been extensively investigated. However, the study on the combination of kenaf fiber and CaCO3 reinforced epoxy resin is rare. This research discussed the effect of CaCO3 particle size and the ratio of kenaf to CaCO3 content on the impact strength of alkali-treated kenaf/ CaCO3/epoxy resin hybrid composites. Thirty % of the hybrid kenaf fibers and CaCO3 particles reinforced epoxy resin composites were fabricated by hand lay-up technique followed by cold press. Impact test of the composite specimens was conducted using a Charpy Impact test according to ASTM D 6110. The morphology of impact fracture surface was examined by scanning electron microscopy (SEM). The results showed that the impact strength of the hybrid composite increased with the decrease of CaCO3 particle size, and increasing the ratio of kenaf to CaCO3. Interfacial bonding between the reinforcement (kenaf and CaCO3) and epoxy resin matrix, the uniform dispersion of kenaf and CaCO3 within the epoxy resin matrix are two crucial factors influencing the impact strength of the composite.

Variation of Indigofera tinctoria’s Immersion Time on Dye Solution and its effect on DSSC efficiency Fahru Nurosyid; Parahita Faqih; Zulaldi Yahya Dewangga; Nurdiyantoro Putra Prasetya
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 01 (2020): April
Publisher : Department of Physics, Sebelas Maret University

The utilization of Indigo tinctoria as a DSSC sensitizer has been done to study the effect of I. tinctoria’s immersion time on DSSC efficiency. One of the most essential components in DSSC is a sensitizer or dye. In this work, the dye has been used in DSSC is the natural indigo dye from I. tinctoria leaves. The extraction was done by dissolving 50 grams of I. tinctoria leaves in 500 mililiters aquades and soaking in various time: 12, 24, 36, and 48 hours. The optical properties of dye solution was characterized by UV-Vis spectrophotometer and the current-voltage of DSSC was characterized by Keithley I-V Meter. The highest absorbance is 2.7 of 48h dye solution, but the best efficiency of DSSC is 5.39 x 10-3 % that owned 24 h cell.

Temperatur Curie dan Medan Koersivitas Material Co0,8Ni0,2 dalam Struktur Random Alloy dan Double Layers Lutfi Rohman; Suci Novitasari; Supriyadi Supriyadi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 01 (2020): April
Publisher : Department of Physics, Sebelas Maret University

Material Kobalt Nikel (CoNi) merupakan paduan penting karena memiliki sifat kemagnetan yang baik diantaranya yaitu temperatur curie dan koersivitas yang tinggi. komposisi, struktur alloy dan ukuran sisi kubus bahan berpengaruh terhadap temperatur Curie dan koersivitas. Simulasi mikromagnetik dilakukan pada material Co0,8Ni0,2 dengan struktur random alloy dan double layers untuk menentukan nilai temperatur Curie dan analisis kurva histerisis. Simulasi material Co0,8Ni0,2 dilakukan menggunakan software Vampire dengan variasi ukuran sisi kubus yang digunakan yaitu 5 nm, 8 nm, 10 nm, 12 nm, dan 15 nm. Hasil simulasi menunjukkan nilai temperatur Curie semakin meningkat dengan bertambahnya ukuran sisi kubus. Pada material Co0,8Ni0,2 double layers diperoleh nilai temperatur Curie lebih tinggi dari pada material Co0,8Ni0,2 random alloy. Karakteristik kurva histerisis pada material Co0,8Ni0,2 random alloy dan double layers menunjukkan bahwa nilai koersivitas meningkat seiring bertambahnya ukuran sisi kubus. Namun pada material Co0,8Ni0,2 random alloy ketika ukuran bahan yang diberikan 12 nm dan 15 nm nilai medan koersivitasnya semakin menurun, dibandingkan saat ukuran 10 nm. Pada ukuran sisi kubus 10 nm dikatakan sebagai ukuran terbaik dari material Co0,8Ni0,2 random alloy ditinjau dari nilai medan koersivitas yang besar.

Identification of Subsurface Structures of Geothermal Potential Area in East of Mount Lawu Using The Gravity Method Sorja Koesuma; Mela Budiani Septianingsih; Budi Legowo
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 01 (2020): April
Publisher : Department of Physics, Sebelas Maret University

Information about the eastern side subsurface stones of Mount Lawu regarding geothermal potential is limited. This research was conducted to provide information regarding geothermal potential in those area by using the gravity method. We did a 18 sites of gravity surveys in eastern flank of Mount Lawu where located in Magetan regency, Ngawi regency and Sragen regency, East Java. The principle of this method is to measure the earth's gravity field, then the value of gravity is corrected by some gravity corrections, i.e. height, tide, drift, normal gravity, free-air, Bouguer and terrain corrections. The Complete Bouguer Anomaly (CBA) shows the formation that related to the rock formation in the subsurface of Mount Lawu. Based on CBA modelling we found that in the eastern flank of Mount Lawu contains of tuff and breccia of volcanic rocks, breccia Jabolarangan and tuff Jabolarangan, lava andesite, igneous rock (pumice), and sedimentary rocks in the form of sandstone and clay. We found a fault structure on six tracks of a research area. Otherwise, we estimated that there is a geothermal potential on the southeast side of the research area

[RETRACTED] Identifikasi Gerakan Tanah Longsor Dengan Pendekatan Ground Shear Strain Menggunakan Pengukuran Mikroseismik di Graha Taman Nirwana Kota Semarang Supriyadi Supriyadi; Rahmad Hafid Hidayatullah; Mahardika Prasetya Aji; Taufik Nur Fitrianto; Rini Kusumawardani
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 01 (2020): April
Publisher : Department of Physics, Sebelas Maret University

This article was retracted due to the following reasons :Article: Identifikasi Gerakan Tanah Longsor dengan Pendekatan Ground Shear Strain Menggunakan Pengukuran Mikroseismik di Graha Taman Nirwana Kota Semarang, Vol. 10 No.1 (2020), pp: 32-36 Author: Supriyadi, R.H, Hidayatullah, Mahardika Prasetya Aji, Taufik Nur Fitrianto, Rini KusumawardaniThis article has been retracted by Publisher with the reason of improper data and error in data processing. All authors of the paper agreed with the reason.

Deteksi Kantuk Menggunakan Jaringan Saraf Tiruan Radial Basis Function dan Particle Swarm Optimization dengan RR Interval Elektrokardiogram Ariefah Shalihah; Nuryani Nuryani; Artono Dwijo Sutomo
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 01 (2020): April
Publisher : Department of Physics, Sebelas Maret University

Sistem deteksi kantuk dirancang menggunakan Elektrokardiogram (EKG) dengan Jaringan Saraf Tiruan Radial Basis Function dan Particle Swarm Optimization (JST RBF-PSO). Karolinska Sleepiness Scale (KSS) menjadi acuan tingkat kantuk yang dikelompokkan menjadi kelas terjaga dan kelas mengantuk. Sistem ini menggunakan algoritma Pan-Tomkins untuk menentukan interval RR dari EKG. Fitur yang digunakan adalah 15 parameter fitur statistik. Pelatihan dan pengujian data menggunakan JST RBF-PSO dengan metode validasi silang. PSO digunakan untuk mengoptimasi parameter utama JST RBF yaitu bobot, pusat dan lebar. Sistem deteksi kantuk ini diuji menggunakan DROZY Database. Hasil penelitian menunjukkan akurasi sistem ini pada segmentasi 40 detik, jumlah neuron 150 dan 15 fitur statistik sebesar 88,36%.

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Contact Name
Risa Suryana

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rsuryana@uns.ac.id

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Location
Kota surakarta,

Jawa tengah

INDONESIA