Indonesia Conference Directory

Corresponding Author
Yoyok Laksono

Institutions
(a)Department of Physics, Universitas Negeri Malang
*yoyok.adisetio.fmipa[at]um.ac.id

Abstract
One way to determine the condition of a dam is to compare the pore-water pressure upstream to downstream. If the upstream porewater pressure is higher than downstream, the dam is in good condition. The pore-water pressure at the dam is obtained from the piezometer that is planted inside the dam. If the piezometer is damaged, the condition of the dam core is unknown. This happened at the Lahor dam where of the 9 piezometers, only one was functioning. The porewater pressure of the piezometer is determined by the height of the water column above it so that if the water level is known in the dam core, the porewater pressure will be known. To find out the water table, georadar can be used using a B-scan survey technique along the Lahor dam. The radargram is then processed to obtain the type of material by finding the wave velocity with reference to the water level at the upstream of the dam. The location of the Water table is obtained from reflections due to anomalous material differences. From the results of surface water level analysis in upstream and downstream it can be concluded that the lahor dam is still in good condition.

Keywords
inspection, dam, Lahor, georadar

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/UHeuMpL6JEqY

Corresponding Author
Satria Bijaksana

Institutions
Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

Abstract
Magnetic anisotropy, particularly in the form of AMS (anisotropy of magnetic susceptibility) has been used widely for petrofabric and structural studies. It is still a popular technique in wide range of applications due to its high sensitivity as well as for its cost and time effectiveness. The technique has also been modified into various methods termed collectively as anisotropy of magnetic remanence (ARM), while the remanence could be either anhysteretic or isothermal remanences. Notable use of these methods include compaction study in sediment as well as study of flow in lavas. The variation of magnetic anisotropy methods will be compared and reviewed. New findings on the nature of magnetic anisotropy in soft and hard rocks will also be presented. This includes the the incorporation of pore distribution analyses into magnetic anisotropy studies.

Keywords
Magnetic anisotropy, sediment compaction, lava flow, pore distribution

Topic
Rock Magnetism

Link: https://ifory.id/abstract/Bqgp8GvxYL3j

Corresponding Author
Samsul Hidayat

Institutions
1) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Indonesia
2) Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Indonesia
3) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Indonesia
4) Department of Electrical Engineering, Faculty of Engineering, Universitas Negeri Malang, Indonesia

Abstract
Applications of quadcopter or hexacopter have made easy for survey. This Unmanned Aerial Vehicle (UAV) technology can accelerate the data collecting. Almost all electric quadcopter or hexacopter are use brushless motor. The brushless motor have 20A or more current consumption. For safety, for high performance electronic device driver, the real time sensor is needed. This study aims to determine the magnetic field response, with variations in hall effect material concentrator The results of this study can at least be taken into consideration in the operation of quadcopter UAVs for increase energy saving and safety.

Keywords
magnetic concentrator, UAV

Topic
Environmental Magnetism

Link: https://ifory.id/abstract/brqKavD3hk8B

Corresponding Author
Ishmah Luthfiyah

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
b) Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia
c) Department of Physics, Universitas Negeri Surabaya, 60254 Surabaya, Indonesia

*markus.diantoro.fmipa[at]um.ac.id

Abstract
SrTiO3 perovskite possesses high dielectric properties and potentially applied as a high-temperature thermoelectric material. Theoretically, physical properties of SrTiO3 can be improved by doping process. Modification of local structure will influence its electrical conductivity, thus a crystal field changes or geometric distortion occurs. Currently, SrTiO3 has been widely studied with various dopants. However, so far there is no comprehensive study about structural modification using multivalent magnetic ion of Chromium (Cr) and external magnetic fields to the electrical conductivity. Cr ions have various valences of 2+, 3+, 4+, 5+, 6+ and the symmetry of Cr is 4h with 6 coordination numbers which can change the local structure of SrTiO3. Besides, Ti ions in SrTiO3 have 67 pm and Cr has symmetry of 4h for the valence of 3+. Under these conditions, Cr will reduce the lattice parameters and a slight shift of apical oxygen to the basal plane will be observed. Since Cr interact with electromagnetic wave in the range of visible light, it might be expected that this compound would show a shift of band gap energy. As the valence also changes to a possible mixed state, the physical properties may exist in complex states. SrTi1-xCrxO3 samples were prepared via solid-state reaction in the various molar ratio of Cr doping. The phase and structure were analyzed using X-ray Diffraction. XRD confirmed that SrTi1-xCrxO3 compounds phase were formed and a slight change in lattice parameters was observed. The local octahedral sixfold symmetry structure of SrTi1-xCrxO3 compounds also changed to be tetragonal with the presence of Cr. Based on the EDX data, the composition of SrTi1-xCrxO3 compounds corresponded to the composition designed. Furthermore, the magnetic field induced I-V conductivity measurement showed that higher Cr fraction enhanced its electrical conductivity. The optical band gap analysis from UV-Vis spectroscopy showed that the band gap reduce accordingly.

Keywords
Magnetic driven, SrTiO3, Cr, conductivity, band gap

Topic
Magnetic Methods

Link: https://ifory.id/abstract/UWqe3F9MPnKC

Corresponding Author
Rosy Eko Saputro

Institutions
1) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang Jl. Semarang 5, Malang 65145, Indonesia
2) Centre for Science and Technology of Advanced Materials, National Nuclear Energy
Agency of Indonesia, Tangerang 15314, Indonesia

Abstract
The use of cobalt ferrite as a filler in ferrofluids was proposed as a smart material with magnetic review for antimicrobial applications. Referring to X-ray diffraction data, the nano particle of Co0.4Fe2.6O4 shows an entirely magnetite phase with a particle size of about 9 nm. Filler morphology shows agglomeration with an average particle size distribution of around 41 nm. Claims for filler elements are made through element mapping. The magnetic properties of filler and ferrofluids are examined through hysteresis curves, resulting in both superparamagnetic conditions. Antimicrobial activity of ferrofluidics is carried out through the diffusion method on three types of bacteria and one type of fungus with a view of the diameter of the inhibited zone observed. Based on this test, a relatively high inhibitory zone value was obtained and could be recommended as an antimicrobial material.

Keywords
Co0.4Fe2.6O4, ferrofluid, magnetic properties, antimicrobial

Topic
Biomagnetism

Link: https://ifory.id/abstract/ckQKAfaJgmNn

Corresponding Author
Nordiana Mohd Muztaza

Institutions
a)Geophysics Section, School of Physics, 11800, Universiti Sains Malaysia, Penang, Malaysia.
*mmnordiana[at]usm.my

b)Centre for Global Archaeological Research Malaysia, 11800, Universiti Sains Malaysia, Penang, Malaysia

c)Department of Geology, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia

Abstract
Bukit Bunuh is situated in Lenggong valley, north of Kota Tampan, Perak state, Malaysia. Meteor impact crater is also known as a small impact crater and has approximately circular depression in the surface of the Earth. This paper present the magnetic map for Bukit Bunuh impact structure presented in a form of contouring image. To detect the impact structure and its structural attribute, a series of magnetic profiles were measure across the suspected area. Magnetic measurement was conducted using Geometric G-856 Proton Precision magnetometers to measure the earth-s total magnetic field and the data was processed using Surfer8 software. Analytic signal map was produced showing low magnetic value which indicate as impact crater filled with sediments, surrounded by high magnetic value which interpreted as rebounds zone. Crater dimensions are estimated about 5 km with central uplift at the Bukit Bunuh area.

Keywords
Bukit Bunuh; Magnetic; Analytic signal; Impact crater

Topic
Magnetic Methods

Link: https://ifory.id/abstract/EyFCYKgRJqPn

Corresponding Author
Dini Fitriani

Institutions
Department of Geophysics
FMIPA Unpad
Jl. Raya Bandung-Sumedang Km 21
Sumedang 45363

Abstract
Cikijing River is a river that flow in the Rancaekek area, West Java. A number of activities occur around the Cikijing River, such as textile industry and domestic activities. These various activities could affect condition of the river and surrounding environment. One of the impacts that can occur is the decreasing quality of the river due to the pollutants that might be produced by these activities. Cikijing River is also used as a source of irrigation of the paddy fields, so that the paddy field could be also be affected. The presence of pollutants in river sediments and soil over a long period of time could change their physical properties including magnetic properties. We have examined the magnetic properties of surface sediments of Cikijing River and top soil of paddy fields around the river considering that magnetic properties could represent environmental conditions. The results show that sampels of sediment river have magnetic susceptibility in range of 356.2-456.3 (× 10-8) m3kg-1. Meanwhile, samples of topsoil in paddy field are 94.1-347.1 (× 10-8) m3kg-1. The χFD (%) of sediment and topsoil have a range of 1.47%-4.84% and 0.27-4.68%, respectively. The value of χFD (%) < 4% is generally found on samples contaminated by pollutant. Statistical analysis between ??? and the χFD (%) has negative correlation indicates that the change of magnetic properties of the samples influenced by anthropogenic sources. The image of magnetic grains with mesh 230 in size have hedral and spherules shape. Based on energy dispersive spectroscopy analysis the magnetic grains contain Fe, O and Ti. Heavy metal contents such as Pb, Hg, Zn, Cd and Cu are also found in sediment and soil.

Keywords
sediment, soil, magnetic susceptibility, anthropogenic, Cikijing River

Topic
Environmental Magnetism

Link: https://ifory.id/abstract/XBgV7DUWJTbu

Corresponding Author
Suci Elya Intan Suryani

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia

b) Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia

* markusdiantoro.fmipa[at]um.ac.id

Abstract
The effort of searching for a new stable oxide electrode for supercapacitor is extensively performed. For the conventional capacitor, the capacitive storage could be strongly depend on high dielectric materials. Besides the high capacity, the release rate is one of the crucial issue for supercapacitor. For the latest case, we should improve a total conductivity of introduce other ionic materials in the system. The high ferroelectric materials of perovskite ATiO3 could candidate for high capacitive materials by introducing FC (Functionalized Carbon) with FC stands for enhancing the conductivity and dielectric constant of composite. The new known common supercapacitor materials of FC (Graphene, Acetylene Carbon Black), Mn2O3, and ATiO3 could be a good candidate for high energy density supercapacitor. The new integrated thermoelectric-supercapacitor device lately introduced due to the implementation of thermoelectric under magnetic field. ATiO3 has been synthesized using conventional solid-state reaction with intermediate calcination. The composite FC/Mn2O3/ATiO3 with ethanol adhesive has been fabricated using conventional die pressed. The capacitance as a function of magnetic field was characterized using DC capacitance meter under various magnetic field generated by double coil magnetic generator.

Keywords
magnetocapacitive, capacitance, FC-Mn2O3-ATiO3, magnetic field, supercapacitor

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/ykfUZaDHwLMx

Corresponding Author
Daeng Achmad Suaidi

Institutions
1) Physics Department, Universitas Negeri Malang. Jl. Semarang No. 5 Sumbersari, Kec. Lowokwaru, Malang 65145, Indonesia.
2) Geophysics Laboratory. Physics Department, Universitas Negeri Malang. Jl. Semarang No. 5 Sumbersari, Kec. Lowokwaru, Malang 65145, Indonesia.

*Corresponding author: daeng.achmad.fmipa[at]um.ac.id

Abstract
Poncokusumo subdistrict is one of the areas in Malang regency which is a hilly area because it is located in the west of Mount Semeru Mountain consisting mostly of productive land. The area of Poncokusumo was taken for this research because of frequent landslides. Geographic Information Systems (GIS) technology is one of the ways that can help to mapping potential areas of landslides. The parameters used in mapping the landslide area of this study are rainfall, geological conditions, soil type, slope, and land cover. Each of these parameters is performed an overlay analysis with a weighted (scoring) technique using the ArcGis 10.3 software. The scoring analysis technique is used to provide value to each of the parameters for each sub variable which is then a cumulative calculation. This cumulative calculation will get a final score to determine a landslide-prone class. Level of landslide spread is divided into 3 classes: low landslide-prone area is 1,249.986 ha (5.749%), the medium landslide-prone area is 19771.74 (90.94%) and the high landslide-prone area is 719.7894 ha (3.311%). Ngadas and Jambesari village is an area that has the highest level of insecurity of landslides with a total area of 263.1 ha and 94.37 ha.

Keywords
Overlay, Poncokusumo, GIS, Landslide

Topic
Computation and Other Related Field

Link: https://ifory.id/abstract/Q2zJteCrGD9a

Corresponding Author
Wahyu Srigutomo

Institutions
a) Physics of Earth and Complex Systems, Physics Dept., Fac. of Mathematics and Natural Sciences, Institut Teknologi Bandung
*wahyu[at]fi.itb.ac.id
b) Geophysics Dept., Fac. of Mathematics and Natural Sciences, Universitas Padjadjaran

Abstract
Comprehension of hydrothermal flow in geothermal systems is very important in designing geothermal power plant development. As an alternative to qualitative approaches of inferring hydrothermal flow based on geochemistry analyses, a quantitative modeling scheme is discussed in this study. The modeling scheme was carried out by utilizing the Brinkman-s equation as a form of modified Darcy-s law. The equation compensates the effects of buoyancy force exerted on a fluid owing to temperature change known as the Boussinesq buoyancy term. The heat equilibrium equation for a convection-conduction condition was simultaneously incorporated to reconstruct the fluid flow in the associated geothermal system coupled with the temperature distribution in the subsurface. The geometrical constrains of the subsurface geothermal system can be provided from the resistivity structure obtained from the inversion of magnetotelluric (MT) data. Other physical parameters required by the modeling were determined from the results of geological and geochemical studies at the particular geothermal area. The modeling scheme was able to infer numerically the pattern hydrothermal flow pattern as well as its velocity magnitude. The modeling scheme was applied to real geothermal systems in Central Java and East Nusatenggara, Indonesia to test its applicability.

Keywords
hydrothermal flow; geothermal system; Darcy-s law; Brinkman-s equation; heat equilibrium equation; magnetotelluric (MT) data

Topic
Computation and Other Related Field

Link: https://ifory.id/abstract/zPGKNaJ6HW3r

Corresponding Author
Anugrah Ricky Wijaya

Institutions
Chemistry Department, FMIPA, Universitas Negeri Malang, Jalan Semarang No. 5 Malang, 65145
*Email: anugrah.ricky.fmipa[at]um.ac.id

Abstract
Anthropogenic activity in coastal areas cause environmental pollution by heavy metals. One of the heavy metals that polluted sea waters is iron (Fe), which is contributed from fishing boats and tourism activities. Monitoring and assessments of Fe are important to protect of environment. In order to assessment, we need develop method quickly. This study used a microwave optimized Bureau Community of Reference (BCR) method with variations in solvent concentration and pH to attack Fe at fraction 2. The sample used was sediment from the Pasir Putih Situbondo waters at 5 m below sea level. The results showed that increasing the concentration of solvent at fraction 2 reveals the leaching process of Fe more optimally. In the analysis of the level of Fe pollution to the environment around the Pasir Putih Beach did not indicate the potential for Fe pollution due to anthropogenic activity. Most of the Fe sources in the Pasir Putih Beach area were Fe sourced from nature.

Keywords
Iron, sediment, pH, BCR microwave, Situbondo.

Topic
Geochemistry

Link: https://ifory.id/abstract/QcbyaPhpeWxH

Corresponding Author
M Munasir

Institutions
(a) Physics Department, Research Centre of Mineral and Advanced Material, Faculty of Mathematics and Naturals Science, Universitas Negeri Surabaya. Unesa-Ketintang Campus, Surabaya, Indonesia, 60321.
(*) munasir_physics[at]unesa.ac.id
(b)Physics Department, Faculty of Mathematics and Science, Universitas Negeri Malang, Indonesia, 65145

Abstract
In this paper, we systematically report the characteristics of nanoparticles (NPs)-SiO2 amorphous, and its application for water treatment. NPs-SiO2 can be obtained from natural quartz sand, then extracted and synthesized using the hydrothermal and co-precipitation method. Has an amorphous phase structure; particle size <80 nm, particle formation tends to form the Si-O-Si chain (like a ring), and has a large porosity. High porosity, and is inert and insoluble, is a ceramic material, is an advantage and is very safe to be applied as a water filter material, in the process of water treatment water consumption. This excellent behavior makes NPs-SiO2 able to absorb heavy metals and dyes that are dissolved in water.

Keywords
NPs-SiO2; Amorphous; water treatment; porosity

Topic
Rock Magnetism

Link: https://ifory.id/abstract/Y6NjFmrGaTub

Corresponding Author
Ayi Syaeful Bahri

Institutions
a) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
*nugrahabahri[at]gmail.com
b) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
c) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
d) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
e) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
f) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
g) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
h) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
i) Badan Penelitian dan Pengembangan Daerah
Jl. DR. Wahidin No. 07 A Pacitan
j) PPI Madiun, BPSDM Perhubungan, Kemenhub
Jl. Tirta Raya, Kota Madiun, Jawa Timur 63129

Abstract
The Pringkuku karst area is located at the south-west of East Java. Pringkuku is a transition zone, in the west is the hill karst of mountain sewu and in the east is the structural hills from Gerindulu watershed to the Tegalombo area in the north of Pacitan district. Sampling and sample observations were carried out by considering 4 parameters: structural and non-structural non-clastic limestone from Wonosari Formation (Tmwl) and structural and non structural clastic limestone from Oyo Formation (Tmo). Both of these lithologies were traversed by the fault trending northeast-southwest in the eastern pringkuku region. Non-clastic limestone units consist of calcite and dolomite while clastic limestone units are dominated by calcite. They deposited on shallow-marine zones and have conformity contact. Both of the limestone lithologies undergone process of diagenesis, in non-structural limestones, the crystals still have euhedral forms while in structural units do not have perfect crystalline shapes, almost rounded due to dissolution. Chemical analysis of the two limestones units revealed the content of Ca, MgO and SiO2 and contained dolomite mineral content in several samples from non-clastic units. Based on petrographic studies, clastic units can be classified as lime-packstone and non-clastic units can be classified as lime-boundstone. The results of the petrographic and geochemical analysis showed an increase in quartz content and carbonate micrite in rock samples close to the fault zone and dolomitization in non-clastic units.

Keywords
Petrography; Geochemistry; Oyo Formation; Wonosari Formation; Limestone; Dolomitization

Topic
Geochemistry

Link: https://ifory.id/abstract/7mqZu6jwLH4b

Corresponding Author
Nabella Sholeha

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
b) Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
*markus.diantoro.fmipa[at]um.ac.id

Abstract
SrTiO3 known as high thermoelectric and ferroelectric materials. Introducing different orbitals may produce an anomalous optoelectric effect. In turn, the materials might also be used as an active solar cell electrode beside of thermoelectric and supercapacitors materials. Thermoelectric and supercapacitor have been widely developed as an alternative energy harvesting and storage device since the fossil energy resources are limited in nature. Thermoelectric materials generate electrical energy from thermal energy, which is abundant and produced every day. SrTiO3 perovskite provides d0 configuration with an energy gap of 3.2 eV and possesses ferroelectric properties. Ni doping using various valence of +2, +3, +4 at Ti site in SrTiO3 compound will modify the normal octahedral configuration, in turn, it will change a micro elastic, crystal field, or coloumbic interactions. Macroscopically, we will observe the physical properties of, e.g., magnetoelectric conductivity. In the compound uses as a raw material of thermoelectric or supercapacitor, we will also obtain double advantages of the magnetic field around the material. Besides, doping Ni element is effective in suppressing heat transfer along with increasing phonon scattering at point defects. SrTi1-xNixO3 was prepared by solid-state reaction followed by sintering process at 860 oC in bulk. The microstructure of SrTi1-xNixO3 was analyzed by XRD and SEM-EDX. XRD data analysis with Cu-Kα wavelength that lattice parameters and normal octahedral structures in SrTiO3 were shifted after doping Ni. The EDX analysis confirmed that the elemental content of the sample corresponds to the designed composition. Thermoelectric and supercapacitor properties were carried out by inducing magnetic field during dielectric and electrical conductivity measurement. Higher Ni stoichiometric fraction contributed to raising electrical conductivity. Thus it will potentially enhance the figure of merit (ZT) and charge-discharge current of SrTi1-xNixO3 as thermoelectric and supercapacitor devices. The photodetectors measurement of Ni-doped SrTi1-xNixO3 is also detailed discuss in this work.

Keywords
photoelectric, thermoelectric, supercapacitor, Ni, SrTiO3, magnetic field, electrical conductivity.

Topic
Magnetic Methods

Link: https://ifory.id/abstract/aYA4JLR9FyfU

Corresponding Author
Wahyu Hidayat

Institutions
1). Geophysical Engineering Department
Faculty of Technology Mineral, UPN “Veteran” Yogyakarta
*wahyu.hidayat[at]upnyk.ac.id

Abstract
Mud Volcano is a phenomenon that is often discussed by people. The case of the emergence of mud volcano in Sidoarjo, East Java, or it is better recognized as "LUSI" has attracted the attention to the lots of researchers and the general community. The effects of the destruction of infrastructure and damage to the environment around the emergence of the Mud Volcano are issues that need special attention. The potential for mud volcano has been recorded in lots of locations in Java, both active and interpreted based on rock deposits. One of the areas indicated to be an ancient mud volcano is the Cengklik Lake area of, Boyolali Regency, Central Java, which is the area of this research. The research was conducted using the geomagnetic method. The measurement was conducted around CengklikLake to the east following rock outcrops which are identified as mud volcano deposits. The interpretation is conducted based on the results of data processing that has been corrected daily variation and IGRF. Several filters have been applied to obtain the desired information. The results have shown a low magnetic anomaly value which spread from Cengklik Lake, AdiSumarmo Airport on the west side and spread eastward continuously until around the outcrop which was identified as ancient volcanic deposits. This pattern of low magnetic anomaly values is interpreted as a result of mud volcano deposits in the area.

Keywords
mud volcano, geomagnetic, infrastructure

Topic
Magnetic Methods

Link: https://ifory.id/abstract/xKgcEZNmPtGp

Corresponding Author
Daeng Achmad Suaidi

Institutions
1) Physics Department, Universitas Negeri Malang. Jl. Semarang No. 5 Sumbersari, Kec. Lowokwaru, Malang 65145, Indonesia.
2) Geophysics Laboratory. Physics Department, Universitas Negeri Malang. Jl. Semarang No. 5 Sumbersari, Kec. Lowokwaru, Malang 65145, Indonesia.
3) FMIPA Central Laboratory. Faculty of Mathematics and Science. Universitas Negeri Malang. Jl. Semarang No. 5 Sumbersari, Kec. Lowokwaru, Malang 65145, Indonesia.
4) Computational Physics Laboratory. Physics Department, Universitas Negeri Malang. Jl. Semarang No. 5 Sumbersari, Kec. Lowokwaru, Malang 65145, Indonesia.

*Corresponding author: daeng.achmad.fmipa[at]um.ac.id

Abstract
Nyusul

Keywords
Nyusul

Topic
Computation and Other Related Field

Link: https://ifory.id/abstract/M7vP68beKRjr

Corresponding Author
Sudarningsih Sudarningsih

Institutions
Department of Physics, Faculty of Mathematics and Natural Sciences,
Universitas Lambung Mangkurat, Banjarmasin 70124, Indonesia

Abstract
Rock magnetic methods have been used in environmental studies, including monitoring anthropogenic pollutions in the form of heavy metals in soils and sediments. Such environmental studies have never been carried out in river sediments from peatlands environment in the tropics. In this study, sediments from Martapura River were characterized for magnetic and heavy metal contents. Martapura River is a river that has a function as a source of PDAM (Regional Water Company) and its as a MCK (bath, toilet and wash) place for the community along the river. Considering that in South Kalimantan there are many mines which are indirectly related to the Martapura River and studies on the Martapura River surface sediments that are related to their magnetic properties and pollution have never been carried out, this research is important to do. Surface sediment samples were taken and measured by a magnetic measurements (magnetic susceptibility) and heavy metal contents (Atomic absorption spectrometer or AAS). The results show that surface sediments have low mass-specific magnetic susceptibility ​​varying from 196.0 to 415.0 × 10-8 m3kg-1 (on average of 231.0 × 10-8 m3kg-1) because influenced by the peatlands environment.The content of heavy metals contained in sediments such as Cu, Zn, Fe, Mn, Al, Na, Ti and Hg. The content of heavy metals in surface sediments that have exceeded the threshold of pollution are Fe and Mn.

Keywords
River sediments, pollution, heavy metals, rock magnetism, Martapura River

Topic
Environmental Magnetism

Link: https://ifory.id/abstract/PGcYa6gUqAxC

Corresponding Author
Tati Zera

Institutions
1Physics Dept. Faculty of Sciences and Technology, Syarif Hidayatullah Islamic State University, Jakarta.

2 Indonesia Institute of Science, Serpong, Tangerang Selatan

Abstract
Abstract. The study of seismic hazard is carried out to minimize the impact of earthquake disasters in particular region. The study presented a seismic hazard analysis using a probabilistic approach for Makassar city, South Sulawesi. PSHA analysis is carried out, namely at T = 0 secods (PGA), T = 0.2 seconds (short period) and T = 1 second ( long period ). The Three dimensional earthquake source model and various attenuation functions that are considered to be in accordance with the seismic characteristics and earthquake source models of the Indonesia-s region are used to calculate the peak ground acceleration with a probability exceeding 10 % and 2 % in 50 years in bedrock. The software used in this analysis is ez-frisk 7.25. The result show an acceleration value of 0.07 g for PGA, 0.13 g for T = 0.2 seconds, and 0.09 g for T = 1 second with probability exceeding10 % in 50 years, and an accelerationvalue of 0.12 g for PGA, 0.22 g for T = 0.2 seconds and 0.15 g for T = 1 second with a probability of 2 % in 50 years. Based on the deagregation curve, the earthquake that make the biggest contribution hazard to the city of Makassar is an earthquake with average magnitude of 6.36 Mw and average distance of 412.72 km from Makassar.

Keywords
Seismic hazard, PSHA, Peak Ground Acceleration, Deagregation

Topic
Environmental Magnetism

Link: https://ifory.id/abstract/3Qp6a7y4PMng

Corresponding Author
Daeng Achmad Suaidi

Institutions
1) Physics Department, State University of Malang. Jl. Semarang 5 Malang
2) Geophysics laboratory, Physics Department, State University of Malang. Jl. Semarang 5 Malang

*E-mail: daeng.achmad.fmipa[at]um.ac.id, WA: 085748413146

Abstract
This paper presents an analysis of the distribution of geothermal manifestations in shallow subsurface of Kasinan Hot Springs in the Kasinan Pesanggrahan Batu area. Analysis of the distribution of geothermal manifestations is based on the results of a three-track resistivity geoelectric survey. The length of each track is 120 meters in the north to northeast of the source, 100 meters to the east and 100 meters to the south of the source using geoelectric method and wenner configuration. The distribution of the Kasinan geothermal manifestations led to the northern to northeastern sources. This is evidenced by the suitability of the value of the resistivity of hot water at the source point with the value of the resistivity of hot water present on the first track. In addition, after being interpreted, the distribution is evenly distributed along the path of Kasinan hot water. Most have a resistivity value of <10 which identifies the value of the resistivity of hot water in that range.

Keywords
geoelectric, resistivity, depth, distribution, kasinan, hot springs

Topic
Computation and Other Related Field

Link: https://ifory.id/abstract/Vw8BYrZvJxNa

Corresponding Author
Daeng Achmad Suaidi

Institutions
1) Physics Department, Universitas Negeri Malang, Jl. Semarang 5 Malang
2) Geophysics laboratory, Physics Department, Universitas Negeri Malang, Jl. Semarang 5 Malang

*e-mail: daeng.achmad.fmipa[at]um.ac.id, WA: 085748413146

Abstract
Rest2dinv imaging of geoelectric acquisition data always produces radiometric degraded images on the edge of the anomaly. This degradation is caused by influencing the resistivity of the anomaly and medium, so that the anomalous edges are imaged with non-singular color lines. In mining exploration, the edge degraded image can cause difficulties in determining the size of mining material deposits, so that prospective mining exploration in a mining area cannot be adequately measured. In this paper the results of the development of a digital image processing system are presented to reduce the effect of degradation of the edges of res2dinv images that are inversed from res2dmod data acquisition. Reduction is done on gray level with the rgb2gray Matlab function followed by edge detection operations using the gradient operator to increase the sharpness of the line in the image. And then the segmentation process is carried out with a discontinuity approach to reinforce the appearance of identified anomalous objects.

Keywords
geoelectric image, degraded edge, restoration, segmentation, discontinuity, gray scale

Topic
Computation and Other Related Field

Link: https://ifory.id/abstract/7pnETtePMb3q

Corresponding Author
Muhammad Rusli Muin

Institutions
Geophysical Engineering, Universitas Tadulako, Palu Sulawesi Tengah

Corresponding author: rusli8998[at]yahoo.com

Abstract
Liquefaction deposits is a well-known process initiated by seismic shaking during strong earthquake. in these soils uniq the opportunities for analyzing these deposits. We applied Magnetic Susceptibility (MS) and Anisotropy of Magnetic Susceptibility (AMS) proxies, to recognize deposits indicative of liquifaction. MS and AMS evidence aid in demonstrating that anomalous soil units are the products of liquifaction event.

Keywords
Liquifaction deposits, Magnetic Susceptibility (MS) and Anisotropy of Magnetic Susceptibility (AMS)

Topic
Rock Magnetism

Link: https://ifory.id/abstract/PhzqgrJXefNj

Corresponding Author
Samsul Hidayat

Institutions
1) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Indonesia
2) Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Indonesia
3) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Indonesia
4) Department of Electrical Engineering, Faculty of Engineering, Universitas Negeri Malang, Indonesia

Abstract
e-mail: samsul.hidayat.fmipa@um.ac.id Abstract. Applications of quadcopter or hexacopter have made easy for survey. This Unmanned Aerial Vehicle (UAV) technology can accelerate the data collecting. Almost all electric quadcopter or hexacopter are use brushless motor. The brushless motor need electric power. Usually power consumptioan increase linearly with thrust. The current flow can up to 80A for 10kg thrust quadcopter. The current is very fluctuated with about 1ms periode. The magnetic field can up to 127 oersteds for 10 cm distance. For sensitive magnetic probe, this field can disturbance data survey. This study aims to determine the magnetic field, with variations in shielding of current conductor. The shielding is carbon fibre, aluminium, and copper which applicated for one conductor and three conductors with different phase. The results of this study can at least be taken into consideration in the operation of quadcopter UAVs for carrying magnetic survey tools.

Keywords
magnetic field, magnetic shielding

Topic
Environmental Magnetism

Link: https://ifory.id/abstract/Bqt6TyvFpgmE

Corresponding Author
M Munasir

Institutions
(a)Physics Department, Research Centre of Mineral and Advanced Material, Faculty of Mathematics and Naturals Science, Universitas Negeri Surabaya. Unesa-Ketintang Campus, Surabaya, Indonesia, 60321.
(*) munasir_physics[at]unesa.ac.id
(b)Physics Department, Faculty of Mathematics and Science, Universitas Negeri Malang, Indonesia, 65145

Abstract
This work presents a study of structure and the magnetic behavior of magnetic nanoparticles (MNPs) extraction process from natural materials: iron sand. The process of extracting and synthesizing Fe3O4 from iron sand was carried out using the co-precipitation method; with the stages of formation of 2 FeCl3(l) and FeCl2(s) compounds, then proceed with the formation of Fe3O4(s) deposits. Magnetic analysis of MNPs, using VSM, structure analysis using XRD, FTIR and HRPD, and morphology using TEM. MNPs have a magnetite structure (Fe3O4) referring to the results of diffraction analysis (XRD) and FTIR, characterized by the presence of Fe-O functional groups; MNPs Fe3O4 are also superparamagnetic, based on the H-Hysterical curve profile. The particle size of MNPs Fe3O4 belongs to the category of nanoparticles (diameter size 15-20 nm), assuming the shape of particles is spherical, which tends to form agglomerated formations.

Keywords
Magnetite; Nanoparticle; MNPs Fe3O

Topic
Rock Magnetism

Link: https://ifory.id/abstract/mpxALU68J4tQ

Corresponding Author
Fariati Fariati

Institutions
Department of Chemistry, Faculty of Mathematics and Natural Science
Universitas Negeri Malang, Jl. Semarang 5, Malang, 65145, East Java, Indonesia

Abstract
Abstract: Study of complex compounds structures of zinc(II) chloride (A) and cadmium(II) chloride (B) with potassium cyanide and N,N--diethylthiourea (detu) have not been reported. Therefore, the synthesize of those complex compounds A and B should be conducted to study their structure prediction. In this research, complex compounds A and B were prepared by means of direct method using aquadest and methanol at 25 ºC and 1 atm. These data of characterization showed that both of A and B complexes have melting points of 203-205 ºC and 210-213 ºC, respectively. Structure prediction and free energy calculation of the A and B complexes used Semi-Empirical PM6. The free energy of both complexes are -129,605 kJ/mol and -381,0029 kJ/mol with tetrahedral coordinate around the metal ion(II), respectively. The interesting finding is that the electrical conductivity of the complexes show different characteristic: ionic for compound A but molecular for compound B. EDX analysis of A and B revealed that the atomic percentage ratio between central and donor atom (S) were 1:4 and 1:1, respectively. In conclusion, the chemical formula predictions of A was [Zn(detu)4](CN)2 and B was [Cd(detu)(CN)2].

Keywords
Key words: complexes structure of Zn(II) and Cd(II), N,N--diethylthiourea (detu), cyanide ion

Topic
Computation and Other Related Field

Link: https://ifory.id/abstract/Y9thvAGbrJmT

Corresponding Author
Kusuma Wardhani Mas-udah

Institutions
1Faculty of Science and Technology, University of Pesantren Tinggi Darul Ulum, PP. Darul Ulum, Jombang 61481, Indonesia
2Mechanical Engineering Department, Faculty of Science and Technology, Universitas Nahdlatul Ulama Sunan Giri, Bojonegoro 62111, Indonesia
3Department of Physics, Faculty of Mathematics and Natural Science, Universitas Negeri Malang, 65145, Indonesia


Corresponding author: ahmad.taufiq.fmipa[at]um.ac.id

Abstract
In this study, we investigated the formation of carbon prepared from corncob using coprecipitation method. The synthesis of corncob was carried out by weighing as much as 5 grams and adding 40 mL of HCl solution by stirring process at 750 rpm at room temperature. The result of the reaction was titrated by using 20 mL of NH4OH solution. The X-ray diffraction data analysis the formation of carbon-graphite nitrate was detected with the space group of R-3m space group. The scanning electron microscopy data presented that the samples had a morphology showing the presence of large aggregate particles. In addition, the elemental mapping analysis also captured the highest carbon element with the composition of 78.83%. The molecular bonds in the charcoal included C-O, C-H and C=C were detected in several wavenumber positions.

Keywords
Synthesis, structure, coprecipitation, corncob, aggregate

Topic
Computation and Other Related Field

Link: https://ifory.id/abstract/mYMQeKGfTWJ2

Corresponding Author
SUMARI SUMARI

Institutions
1)Chemistry Department, Universitas Negeri Malang, Indonesia
2)Chemistry Department, Universiti Malaya, Malaysia

Corresponding author: sumari.fmipa[at]um.ac.id

Abstract
Abstract. This study aimed to synthesize zeolite NaX and HX using silica sand as a raw material. Silica purification was carried out using leaching method as a function of immersion time followed by the sol gel method. Purified silica was characterized using X-RF, X-RD and SEM. Synthesis of zeolite-X was carried out using the hydrothermal method by reacting NaOH, Al(OH)3, SiO2 with a mole composition ratio of 58: 58: 134. Synthesized zeolites were characterized using XRD, FT-IR, XRF, SEM, and BET. The results showed that the optimal immersion time is 12 hours where the highest silica yield obtained is 95.1 wt% and after treated with sol gel method is obtained yield of 98 wt% silica. The synthesized zeolite Na-X and H-X had SiO2/Al2O3 molar ratios of 2.94 and 3.14. The existence of the peak of FTIR spectrum at wave numbers of 484, 538, 818, and 999 cm-1 indicates the presence of a specific zeolite functional group which shows the zeolite X framework is formed. The SEM test shows that octahedral crystals are formed which confirmed the zeolite X. The sinthesized zeolite of Na-X and H-X have surface areas respectively of 14.229 m2/g and H-X of 25.147 m2/g.

Keywords
silica, leaching method, sol gel method, hydrothermal method, synthesis of zeolite Na-X and H-X.

Topic
Geochemistry

Link: https://ifory.id/abstract/rMZ9RzCBubXF

Corresponding Author
Endang Ciptawati

Institutions
Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia

Corresponding author: fauziatul.fajaroh.fmipa[at]um.ac.id

Abstract
Zinc ferrite (ZnFe2O4) nanoparticle is one of the semiconductor materials that can be used as a catalyst in photodegradation of Malachite Green. In this research, the synthesis of ZnFe2O4 nanoparticle using coprecipitation method with microwave assistance and its effectiveness in photodegradation of Malachite Green was studied. ZnFe2O4 nanoparticles with NaOH concentration variations of 1 M, 1.5 M, and 2 M had been successfully synthesized based on the results of XRD characterization. The peaks produced are following JCPDS Card No. 22–1012. The analysis of BET method showed that the surface area of ZnFe2O4 nanoparticles with NaOH concentrations of 1 M, 1.5 M, and 2 M are 1030.268, 225.193, and 1974.447 m2/g respectively. In addition, photodegradation result of Malachite Green showed that ZnFe2O4 nanoparticles with NaOH concentration of 2 M was able to degrade 88.5% of malachite green in 90 minutes.

Keywords
coprecipitation method, photodegradation, zinc ferrite

Topic
Magnetic Methods

Link: https://ifory.id/abstract/GKaE6xUhADjw

Corresponding Author
Thutug Rahardiant Primadi

Institutions
Universitas Negeri Malang

Abstract
Zinc ferrite (ZnFe2O4) nanoparticles is one of the semiconductor materials that can be used as a catalyst in photodegradation of Malachite Green. In this research, the synthesis of ZnFe2O4 nanoparticles was conducted by using coprecipitation method with microwave assistance, and then its effectivity in photodegradation of Malachite Green was studied. Synthesis of ZnFe2O4 nanoparticles with NaOH concentration variations of 1 M, 1.5 M, and 2 M had been successfully synthesized based on the results of XRD characterization. The peaks produced are following JCPDS Card No. 22–1012. The analysis of BET method showed that the surface area of ZnFe2O4 nanoparticles with NaOH concentrations of 1 M, 1.5 M, and 2 M are 1030.268 m2/g, 225.193 m2/g, and 1974.447 m2/g respectively. In addition, the photodegradation result of Malachite Green showed that ZnFe2O4 nanoparticles with NaOH concentration of 2 M was able to degrade 88.5% of malachite green in 90 minutes.

Keywords
coprecipitation method, photodegradation, zinc ferrite

Topic
Environmental Magnetism

Link: https://ifory.id/abstract/wy76AFDJ8CKX

Corresponding Author
Nurul Hidayat

Institutions
1) Department of Physics, Faculty of Mathemtics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang, 65145, Indonesia
2) Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand

a) corresponding authors email: nurul.hidayat.fmipa[at]um.ac.id

Abstract
Zinc oxide has always been one of the most important materials for advanced applications, even with different shapes and sizes. In this present study, we report the crystal formation and optical characteristics of zinc oxide materials. A sol-gel technique at ambient condition was chosen to fabricate the zinc oxide from zinc acetate precursor. In case of low purity of zinc oxide phase formation, heat treatment may solve the problem. We observed that the heating temperature enables the reduction of impurities and therefore enhace the properties of the produced zinc oxide. The optical properties discussed in this study are absorbace, energy gap, refractive index, and optical conductance.

Keywords
Heat Treament, Crystal Structure, Optical Properties

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/AWdfT4FtEak3

Corresponding Author
Arif Juliansyah

Institutions
a) Departmen of Physics, Faculty of Mathematics and Science, Universitas Negeri Malang, Malang, 65115, Indonesia
*arif.juliansyah.1803228[at]students.um.ac.id
b) Advance Material and Mineral Laboratory, Faculty of Mathematics and Science, Universitas Negeri Malang, Malang, 65115, Indonesia

Abstract
The gold mining is carried out by the people of Labuan Kuris village traditionally, with processing sites that are close to the Watershed that allow river flow to be contaminated with heavy metals from gold processing waste. One effort to understand such environmental conditions is to study the properties of magnetic minerals contained in river sediments using the method of rock magnetism. Sampling of river sediments from upstream to downstream is 30 points. This study aims to determine the comparison of magnetic properties in river sediments before and after exposure to gold processing wastes through the value of magnetic susceptibility (lf and hf) measured using Suceptibilitymeter Bartington MS2B. The results showed that the average low frequency magnetic susceptibility (lf) of river sediment samples before exposure to waste was 810.66 x (10-8m3kg-1), whereas for low frequency magnetic susceptibility values (lf) after sediment samples were exposure to waste is 19,746.37 x (10-8m3kg-1). The mean value of lf indicates that there is an increase in the value of river sediment magnetic susceptibility from upstream to downstream before and after exposure to peoples mine waste.

Keywords
Magnetic susceptibility; River sediments; Community mines

Topic
Environmental Magnetism

Link: https://ifory.id/abstract/VQTjn7tCqARG