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INDONESIA
Indonesian Physical Review
Published by Universitas Mataram
ISSN : 26151278     EISSN : 26147904     DOI : -
Core Subject : Science, Education,
Education Physics
Indonesian Physical Review is a peer review journal which is managed and published by Physics Departement, Faculty of Mathematics and Natural Sciences, Universitas Mataram. This journal is published periodically three times a year, in January, May and September. IPR is Open Accsess for all readers and includes research developments in physics both experimentally and analytically. Focus and scope include Theoritical Physics, Computation, Material sciences, Instrumentation, Biophysics, Geophysics, and Optics.
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Articles 5 Documents
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Search results for , issue "Vol. 3 No. 1 (2020)" : 5 Documents clear
THREE-DIMENSIONAL RESISTIVITY MODEL FOR GROUND WATER EXPLORATION IN VOLCANIC ZONE OF TIDAR PLETEAU, MALANG, EAST JAVA Irwan, Irwan; Ilham; Adi Susilo
Indonesian Physical Review Vol. 3 No. 1 (2020)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v3i1.39

Abstract

Geoelectrical resistivity method is popular technique for subsurface mapping of groundwater, mining exploration, and structural geology. For case study in Tidar Plateau which characterized by hard rock of volcanic breccia, lava, tuff, and conglomerate,  the groundwater system occurs only by the secondary porosity (faulting, facturing, and weathering). Therefore it becomes difficult task for determine position of good well site in Tidar Plateau. Geoelectrical technique by Schlumberger configuration was choosen to investigated the ground water system in this area. Total 5 Vertical Electrical Sounding (VES) acqusition point (400 m length measurement; spacing 10 m) for data measurement with coverage area about 400 x 400 m2. For data processing was used IP2Win, Progress3, and RockWork 16.  The data processing results showed high accuration with avarage Root Mean Square (RMS) error about 0.3 – 8.3 %. According to resistivity results, the study area has resistivity between  0.3– 2.5x104 . The rocks which have resistivity between 0.3 – 12.52  interpreted as sandy-clay; 12.52 – 50  interpreted as wet sandstone (aquifer); 129 – 178  interpreted as conglomerat; 700 – 1300  interpreted as tuff, sand, and dry gravel; 2600 – 2.5x104  interpreted as volcanic breccia. This geoelectrical results has succesful finding the fresh water at VES 5 after drilled at depth 100 m at wet sandstone formation. To findout distrubution of aquifer layer, a three-dimensional (3D) resistivity model was developed. The 3D resistivity model shows the aquifer layer image look the dome-like structure and image the fracture regions which becomes the pathway of groundwater system. 
SPEKTRO PLUVIOMETER SEBAGAI ALAT PENENTU DIAMETER DAN KECEPATAN JATUH BUTIRAN HUJAN Yulia Satriadi; I Wayan Sudiarta; Dian Wijaya Kurniawidi
Indonesian Physical Review Vol. 3 No. 1 (2020)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (464.723 KB) | DOI: 10.29303/ipr.v3i1.32

Abstract

Cuaca merupakan gejala alam yang terjadi dalam waktu yang relatif singkat, dan perubahan cuaca yang tiba-tiba dapat menimbulkan kejadian bencana alam. Fenomena cuaca yang berdampak langsung  antara lain adalah hujan. Dalam penelitian ini dilakukan penentuan diameter dan kecepatan jatuh butiran hujan. Diameter dan kecepatan jatuh butiran air yang dihasilkan dapat dijadikan sebagai pemodelan butiran hujan yang bermanfaat untuk mitigasi bencana. Penelitian ini menggunakan metode optical spektro pluviometer yang dilengkapi dengan laser diode sebagai pemancar cahaya dan sensor  cahaya TEMT6000 sebagai penerima cahaya. Prinsip kerja spektro pluviometer berdasarkan perubahan tegangan yang dihasilkan oleh butiran hujan ketika menghalangi cahaya ke sensor. Diameter butiran air yang terukur yaitu diameter butiran air hasil observasi (Dobs) berkisar pada rentang 3,8 mm – 5,7 mm,  diameter butiran air hasil model (Dmod) berkisar pada rentang 3,6 mm hingga 5,5 mm. Kecepatan jatuh butiran air hasil observasi (vobs) pada rentang 0,98 m/s – 1,7 m/s dan hasil kecepatan jatuh butiran air hasil model (vmod) pada rentang 0,9 m/s hingga 2,5 m/s.
PENENTUAN UKURAN BUTIR KRISTAL CuCr0,98Ni0,02O2 DENGAN MENGGUNAKAN X-RAY DIFRACTION (XRD) DAN SCANNING ELECTRON MICROSCOPE (SEM) Lalu A. Didik
Indonesian Physical Review Vol. 3 No. 1 (2020)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (653.067 KB) | DOI: 10.29303/ipr.v3i1.37

Abstract

Telah dilakukan pengukuran ukuran butir Kristal CuCr0,98Ni0,02O2 dengan menggunakan persamaan Scherer dan analisa langsung menggunakan Scanning Electron Microscope (SEM). Kristal CuCr0,98Ni0,02O2 disintesis dengan menggunakan metode solid state reaction.  Untuk dapat mendapatkan data menggunakan persamaan Scherer, sampel harus terlebih dahulu dikarakterisasi menggunakan X-Ray Difraction (XRD). Hasil penghitungan menggunakan persamaan Scherer menunjukkan ukuran butiran Kristal sebesar (0,113 ± 0,015) µm dengan ralat relatif sebesar 13,2 %. Sedangkan pengukuran secara langsung menggunakan SEM menunjukkan ukuran butir Kristal sebesar (1,08 ± 0,23) µm dengan ralat relatif sebesar 21 %. Perbedaan hasil penghitungan dengan hasil pengukuran menggunakan SEM disebabkan karena morfologi lapisan. Morfologi kristal yang dihasilkan oleh scanning berkas elektron sekunder pada SEM memungkinkan untuk mendapatkan perbesaran gambar yang cukup sehingga dapat dilakukan pengukuran secara langsung. Sedangkan penghitungan ukuran butir Kristal CuCr0,98Ni0,02O2 menggunakan  persamaan Scherer berdasarkan prinsip difraksi sinar X dengan jarak antar celahnya adalah jarak antar atom pada Kristal sehingga untuk mendapatkan data ukuran butir Kristal menggunakan persamaan Scherer sampel harus terlebih dahulu dikarakterisasi menggunakan XRD. Selain itu, karena dilakukan secara langsung pengukuran hasil karakterisasi menggunakan SEM bukan mengukur ukuran butir Kristal melainkan ukuran partikel.   
ANALISIS KUALITAS MINYAK GORENG BERDASARKAN SUHU PEMANASAN DENGAN METODE KOEFISIEN VISKOSITAS FALLING BALL Khaeratin Shoaliha; Kurniawan Arizona; Bahtiar Bahtiar
Indonesian Physical Review Vol. 3 No. 1 (2020)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (792.71 KB) | DOI: 10.29303/ipr.v3i1.38

Abstract

This study aims to determine the effect of temperature on oil viscosity or viscosity using the falling ball method. The approach in this study uses a quantitative approach to the type of laboratory experimental research. The population of this research is cooking oil, by taking three types of oil samples. The three types consisted of palm oil, coconut, and olive which were then observed for their effects on temperature using the fall ball method. Data were collected through laboratory experiments with measurements three times using the falling ball viscosity method. The data analysis technique used is regression analysis. Based on tests that have been done, it can be observed that palm oil before it is heated has a viscosity value of 0.885 Ns / m2, when palm oil is heated to temperatures of 40˚C, 60˚C, 80˚C, and 100˚C the viscosity value changes to 0.854 Ns / m2, 0.754 Ns / m2, 0.828 Ns / m2 and 0.616 Ns / m2. Coconut oil before heating has a viscosity value of 0.828 Ns / m2, when heated with the same temperature the viscosity value changes to 0.666 Ns / m2, 0.588 Ns / m2, 0.572 Ns / m2, and 0.524 Ns / m2. Olive oil before heating has a value of 0.919 Ns / m2, when it is heated the value decreases to 0.869 Ns / m2, 0.774 Ns / m2, 0.746 Ns / m2, and 0.680 Ns / m2. Correlation value obtained based on data calculations is -0.616 meaning that temperature and viscosity have a strong relationship, a negative sign indicates that the relationship is inversely proportional. It can be seen that there is an effect of viscosity value on cooking oil temperature. 
THE STUDY OF GRAPHENE BAND GAP USING HATREE FOCK METHOD IN MOLECULAR SCALE Siti Alaa; Muhammad Fajrin; Eva Nurhaliza; Dian Wijaya Kurniawidi; Susi Rahayu; I Wayan Sudiarta
Indonesian Physical Review Vol. 3 No. 1 (2020)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (463 KB) | DOI: 10.29303/ipr.v3i1.35

Abstract

Graphene is known as an advanced material that has good electrical conductivity and heat conductivity. To understand the nature of graphene it is necessary to calculate the energy, band gap and vibrate frequency at the nanoscale. One method that can be used is the ab initio calculation using the Hatree-Fock method. In this research, we performed a computational study of the electronic properties of grapheme within RHF/STO-3G basis set in different cluster molecules.  From this study we get band gap for graphene in ab initio level, have a consistant value around zero.  Using ab initio method, we can obtain a deeper understanding about the graphene behaviour at the molecular scale.

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