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JPSE (Journal of Physical Science and Engineering)
ISSN : 25412485     EISSN : 25412485     DOI : -
JPSE (Journal of Physical Science and Engineering) is published twice a year in April and October by Physics Department of Universitas Negeri Malang, Indonesia. e-ISSN: 2541-2485 The journal is devoted to publishing original, frontier and important of various branches of Physics Science and Engineering. Editors welcome scholars, researchers and practitioners of Physics around the world to submit scholarly articles to be published through this journal (free of charge).
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Articles 22 Documents
Kajian Electronic Structure Pada ZnO Nanoparticles Menggunakan Ionization Energy-Tight Binding Model Hardianto, Yuda Prima
JPSE (Journal of Physical Science and Engineering) Vol 3, No 2 (2018): JPSE (Journal of Physical Science and Engineering)
Publisher : Universitas Negeri Malang

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Abstract

AbstractZinc oxide (ZnO) nanoparticles have been investigated intensively related to their applications such as in optical band gap energy for semiconductor application. In general, the characterization of band gap energy of the ZnO nanoparticles has been carried out using UV-Vis spectroscopy. In this work, ionization energy-tight binding model was developed to analyze the optical binding energy of the ZnO nanoparticles. The primary technique of the electronic structure calculation was an analytical calculation of overlap integral of 2p orbital from O and 3d orbital from Zn. The result of the calculation presents that the maximum bandgap energy of ZnO particles is about of 4.4 eV. This result is almost similar to band gap energy of the ZnO nanoparticles showing by experimental result.Keywords: Electronic structure, ZnO, band gap energy, ionization energy-tight binding model. AbstrakPartikel nano oksida seng (ZnO) selama ini banyak dikaji secara intensif berkaitan dengan aplikasinya seperti terkait kajian energi band gap untuk aplikasi semikonduktor. Secara umum, karakterisasi energi band gap partikel ZnO dilakukan mengunakan spektrometer UV-Vis. Dalam kajian ini, ionization energy-tight binding model telah dikembangakn untuk menganalisis energy band gap partikel ZnO. Teknik utama perhitungan electronic structure didasarkan pada kalkulasi analitik dari integrak overlap orbital oksigen 2p and orbital Zn 3d. Hasil analis data menunjukkan bahwa energi band gap maksimum dari partikel ZnO sekitar 4,4 eV yang menunjukkan nilai yang hampir sama hasil eksperimen.Kata Kunci: Electronic structure, ZnO, energi band gap, ionization energy-tight binding model.
Integrasi Pengembangan Techno Park dan Mitigasi Bencana Daerah Volcano Hosted Geothermal Cangar, Arjuno-Welirang Berbasis Metode Seismik Maryanto, Sukir
JPSE (Journal of Physical Science and Engineering) Vol 3, No 1 (2018): JPSE (Journal of Physical Science and Engineering)
Publisher : Universitas Negeri Malang

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Abstract

Telah dilakukan integrasi konsep pengembangan Techno Park dan Mitigasi Bencana pada kawasan Volcano Hosted Geothermal dengan berdasar pada metode seismik. Pada tahap awal dilakukan survey mikroseismik dengan analisis pergerakan partikel. Tujuannya untuk mengetahui sebaran episenter dan hiposenter gempa bumi mikro yang berubah secara spatio- temporal dan sebaran nilai Peak Ground Acceleration (PGA) yang dihitung menggunakan metode Kanai. Akuisisi data dilakukan di dua lokasi (Tretes dan Cangar) tempat pengembangan Techno Park dan observatorium Gunungapi dan Geothermal menggunakan seismograf TDL-303S dan juga dikembangkan homemade seismometer berbasis MEMS. Hasil penelitian didapatkan rentang frekuensi gempa bumi mikro berkisar 12-24 Hz. Terdiri atas 34 event tersebar di sekitar Daerah Cangar dengan rentang kedalaman 4-262 meter, serta 6 event di sekitar Kawah Welirang dengan rentang kedalaman 985-2152 meter. Sumber event di sekitar kawah diduga sebagai akibat aktivitas vulkanik Kawah Welirang. Nilai Sebaran nilai PGA di Daerah Cangar berkisar 11,23 gal hingga 21,8 gal. Sedangkan, di Daerah Tretes berkisar 5,93 gal hingga 18,87 gal. Rentang nilai tersebut menunjukkan tingkat risiko akibat gempa tektonik pada daerah penelitian termasuk kategori aman, sehingga layak untuk pengembangan daerah monitoring erupsi gunungapi Arjuno WelirangDOI: http://dx.doi.org/10.17977/um024v3i12018p025 
Identifikasi Sistem Panas Bumi Daerah Cangar, Jawa Timur menggunakan Metode Magnetotelurik Rahmawati, Rahmawati; Maryanto, Sukir; Susilo, Adi
JPSE (Journal of Physical Science and Engineering) Vol 2, No 2 (2017): JPSE (Journal of Physical Science and Engineering)
Publisher : Universitas Negeri Malang

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Abstract

The research has been done in Cangar area of complex Mt.Arjuno-Welirang, East Java.  This research using magnetotelluric method. The purpose of this research is to identify the geothermal system of research area based on its resistivity value. Acquisition of magnetotelluric data done in 11 point with spaces 70 meters up to 150 meters. Magnetotelluric measurement points is divided into 5 profile. Based on the result of data processing given range resisitivity value in research area between 4 W.m up to 2000 W.m.  The result of modeling geothermal system in Cangar indicated of caprock (≤21 W.m), reservoir (21 W.m – 167 W.m) and a heat source (≥167 W.m). Geothermal Cangar is controlled by Cangar fault.
UJI POTENSIODINAMIK MATERIAL PELAPIS ANTI- KOROSI: Acrylic Paint-PANi/SiO2 Munasir, Munasir; Umah, H; Syahra, D M T
JPSE (Journal of Physical Science and Engineering) Vol 1, No 1 (2016): JPSE (Journal of Physical Science and Engineering)
Publisher : Universitas Negeri Malang

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Abstract

Polyaniline (PANi) was succesfully prepared from Ammonium Peroxodisulfate (APS) and anyline using chemical oxidation method. Silica (SiO2) was synthesized from natural sands taken from Banjar. PANi/SiO2 composites were prepared using mechanical mixing route. The composites were prepared by variating the weight compositions of PANi:SiO2 of 2.5%, and 5% for SiO2. Furthermore, the coating process of Paint-PANi/SiO2 on SS304 stainless stell by spray coating technique. The characterization of anticorrosive behaviour of Paint-PANi/SiO2 was tested by potentiodynamics method. The obtained Tafel curve was then analyzed by means of ANOVA method. The best anticorrosive performance refered to the sample of Paint-PANi/(5%)SiO2, both of before and after exposure processes. The corrotion rate of before and after exposure processes were 0,00896000 mpy and 0,00024408, respectively. DOI: http://dx.doi.org/10.17977/um024v1i12016p025
Pemberian Syarat Reflektif Kecepatan Fluida di Batas Anomali Kedalaman dalam Simulasi Persamaan Air Dangkal Pramono, Nugroho Adi
JPSE (Journal of Physical Science and Engineering) Vol 1, No 1 (2016): JPSE (Journal of Physical Science and Engineering)
Publisher : Universitas Negeri Malang

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Abstract

The simulation of shallow water equation with straight configuration reflective depth anomaly has been performed. This program simulated wave absorber in the beach in order to prevent furthur abrasion of by sea. This program using modified Navier-Stokes equation and running on Matlab program. The result show that depth-anomaly reduced the amount on wave amplitudo by significant value.DOI: http://dx.doi.org/10.17977/um024v1i12016p007
Pendeposisian Besi pada Subtrat Alumunium dengan Metode Sputtering Terhadap Variasi Suhu Saputro, Handoyo
JPSE (Journal of Physical Science and Engineering) Vol 1, No 1 (2016): JPSE (Journal of Physical Science and Engineering)
Publisher : Universitas Negeri Malang

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Abstract

The sample was a sputtered iron by aluminium substrate at variations of 60oC to 180oC with 3 hours of deposition time. The research result showed that some colour changing those partially golden yellow mix with red, blue and some of the grey. Micro-hardness was tested using MXT70 model and showed that the maximum hardness level at the temperature of 100oC is 113%. However, at temperature 180oC the hardness level decreased. The resistivity and conductivity were determined by four points probe method. It was known that the resistivity decreases up to (66 ± 3) x 10-5 Ω/m and the conductivity increases (147 ± 65) (Ω/m)-1 at temperature 180oC and they tended to be linear and it has been the best measurement result. DOI: http://dx.doi.org/10.17977/um024v1i12016p029
Study on Physical Properties of Reduced Graphene Oxide from Heating Coconut Shell Wardhani, Mas’udah Kusuma; Astuti, Fahmi; Darminto, Darminto
JPSE (Journal of Physical Science and Engineering) Vol 1, No 1 (2016): JPSE (Journal of Physical Science and Engineering)
Publisher : Universitas Negeri Malang

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Abstract

A research to determine the solar activity in the months from January to March 2015, and analyze the characteristics of flare on the rotation angle shifting of the sunspot group of sunspot sample observed, has been conducted. The method was observation and descriptive analysis of quantitative data. Determination of coordinates of sunspot was done using the software IDL. These observations were made in the Aerospace Observation Center (BPD) LAPAN Watukosek. Data were analyzed in the form of a sketch-owned BPD Sunspot LAPAN Watukosek, ie sunspot sketch of months from January to March in 2015 and the data was taken from NOAA. The results showed that the flare is not always the case in large class of sunspot groups, however, the small class was able to produce a flare. Most flares ware occur after experiencing a shift angle in the preceding or following although with angles that were not too large (<10 °). The highest solar activity was occurred in January 2015 with the appearance of a sunspot group consisting of as many as 130 in 1063 sunspots. DOI: http://dx.doi.org/10.17977/um024v1i12016p001
Pengaruh Nanosilika terhadap Kekerasan dan Porositas Nanokomposit HA-SiO2 Berbasis Batuan Onyx Bojonegoro Yudyanto, Yudyanto; Sugara, Yeyen Dwi; Hartatiek, Hartatiek
JPSE (Journal of Physical Science and Engineering) Vol 1, No 1 (2016): JPSE (Journal of Physical Science and Engineering)
Publisher : Universitas Negeri Malang

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Abstract

Hydroxyapatite (HA) is one of bioceramics which used in many biomedic applications. However, HA has poor mechanical properties. HA has be composited with material which has a good mechanical properties, such as nanosilica. In this study, synthesis HA was prepared by co-precipitation method. Base material to synthesis HA is onyx rock from Bojonegoro which contain 94.33 % Ca. While phosphate obtainable from Ammonium Dihydrogen Phosphate. The vickers hardness result using micro hardness vikers show that adding nanosilica is influence the mechanical properties of HA. The value of vikers hardness at adding nanosilica 10, 20, 30% respectively are 38.2; 42.3; 43.1 HVN while the porosity are 44.4; 40.7; 39.3 %. DOI: https://dx.doi.org/10.17977/um024v1i12016p013
Analisis Terjadinya Flare Berdasarkan Pergeseran Sudut Rotasi Group Sunspot pada Bulan Januari – Maret 2015 Melalui LAPAN Watukosek Hasan, Mochamad Fatchur Rouf; Sutrisno, Sutrisno; Setiahadi, Bambang
JPSE (Journal of Physical Science and Engineering) Vol 1, No 1 (2016): JPSE (Journal of Physical Science and Engineering)
Publisher : Universitas Negeri Malang

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Abstract

A research to determine the solar activity in the months from January to March 2015, and analyze the characteristics of flare on the rotation angle shifting of the sunspot group of sunspot sample observed, has been conducted. The method was observation and descriptive analysis of quantitative data. Determination of coordinates of sunspot was done using the software IDL. These observations were made in the Aerospace Observation Center (BPD) LAPAN Watukosek. Data were analyzed in the form of a sketch-owned BPD Sunspot LAPAN Watukosek, ie sunspot sketch of months from January to March in 2015 and the data was taken from NOAA. The results showed that the flare is not always the case in large class of sunspot groups, however, the small class was able to produce a flare. Most flares ware occur after experiencing a shift angle in the preceding or following although with angles that were not too large (<10°). The highest solar activity was occurred in January 2015 with the appearance of a sunspot group consisting of as many as 130 in 1063 sunspots. DOI: http://dx.doi.org/10.17977/um024v1i12016p019
Identifikasi Kerentanan Longsor Daerah Pangalengan Dengan Metode Slope Morphology Amukti, R.; Mildan, D.; Dinata, I. A.; Isniarno, N. F.; Wijaksana, I. K.
JPSE (Journal of Physical Science and Engineering) Vol 2, No 1 (2017): JPSE (Journal of Physical Science and Engineering)
Publisher : Universitas Negeri Malang

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Abstract

Pangalengan is located between 107o29-107o39 BT and 7o19-7o6 LS. Based on its topography and geological condition, Pangalengan has steep slopes and lies between two strike-slip faults. Average annual rainfall of this area is about 1,996 mm with 5.47 mm of average daily rainfall. The area is about 27294.79 hectares with population of 148353 inhabitants. According to these data, Pangalengan has high risk of landslide. Landslide occurred in Pangalengan on 05-05-2015 at 14:00 pm, caused 9 fatalities, 4 people seriously injured, 134 people evacuated, 10 houses buried, geothermal steam flow pipe of Energy Star damaged. It is necessary to analyze slope morphology and study the potential hazard areas of landslide. The result shows that Cibitung which has steep (35o-45o) and very steep (45o-65o) slope  is prone to landslide with an area of ± 3038 hectares spread to the south.DOI: http://dx.doi.org/10.17977/um024v2i12017p001 

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