Indonesia Conference Directory

Corresponding Author
Eka Yuliana Agustin

Institutions
(a) Departmen of Physics, Faculty of Mathematics and Science, Universitas Negeri Malang, Malang, 65115, Indonesia
(b) Advance Material and Mineral Laboratory, Faculty of Mathematics and Science, Universitas Negeri Malang, Malang, 65115, Indonesia

Abstract
In the past few decades studies of rock magnetism can be used to various problems, such as the study of magnetism for detecting pollution in agriculture soil, as well as rivers and lakes sediments. In this study, rock magnetic methods were used to study magnetic properties of bus bottom ash. This research was conducted with the aim of developing new methods to determine the level of exhaust emissions of bus and others. Sampling was carried out by scrapping the exhaust tube of the bus on two different types of buses, i.e. 35 samples on public buses and 14 samples on tourism buses. Samples were tested to determine the elements with XRF and magnetic susceptibility test using Bartington MS2B. The measurement results shows that the elemental content found in bottom ash samples, among others, Fe 18.6 - 72.01%, Mo 10-47%, S 7-24.5%, Ca 0.53-24.7%, P 0 , 9-2.9%, Zn 0.38-2.99%, Ni 0.07-0.28%, Cu 0.17-0.4%, Mn 0.09-0.5%, Cr 0.1 -0.5%, Ti 0.16 -1,1%, Re 0.2-0.3%, 0.06-0.6%. The value of low frequency magnetic susceptibility (χlf) the public bus samples have a range (4.00 - 343.77) x 10−8 m3/kg with an average of 46.31 x 10−8 m3/kg with an average of χfd of 3.45%. The tourism bus emission samples has a range between (5.19 - 146.37) × 10−8 m3/kg with an average of 51,880 x10-8 m3/kg with an average χfd of 3.68%. The types of magnetic minerals found on public and tourism buses imply ferrimagnetic minerals with superparamagnetic (SP) and stable single domain (SSD).

Keywords
Bottom Ash; Magnetic Susceptibility; chemical Elements

Topic
Environmental Magnetism

Link: https://ifory.id/abstract/ZPxXwtcy8gmE

Corresponding Author
eleonora agustine

Institutions
(1) Universitas Padjadjaran (leo[at]geophys.unpad.ac.id),
(2) Institut Teknologi Bandung

Abstract
This research has been done in the North Jakarta to analyze in soil physical properties as indicators of environmental pollution using geophysical methods based on electricity and combined by chemical analysis. All samples of soil taken from two different sites. The first site is along Jalan Yos Sudarso, and the second site is along the banks of Kali Sunter. The length of each site is one kilometer, with spacing point of soil samples as far as 100 meters. Each samples tested in laboratory to observe a value of Total Dissolved Solid or TDS, Electrical Conductivity or EC, and acidity, by assumed normal condition weather. The results of laboratory tests showed an average value of TDS 118 ppm, EC amounted to 236 microsiemens and acidity is shown to alkaline, which means that the area has been polluted environment. Increasing TDS value is followed by increasing EC value and the graph shows a linear relationship between both of them. Environmental pollution is predicted caused by the contribution of vehicle exhaust fumes and industrial pollution. Pollution pattern tends to increase toward to the north approaching traffic line, harbor and industry. Scanning Electron Microscopy or SEM result showed the predominance of grain shape changes increasingly rounded and the trend of increasing concentration of C, PB and Fe and towards the north.

Keywords
Air Pollution, acidity, EC, TDS, SEM, North Jakarta

Topic
Environmental Magnetism

Link: https://ifory.id/abstract/7G2CjJY9ZXMb

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
Gas detection is crucial, especially with regard to environmental pollution. Air pollution by toxic gases impacts not only on the contamination of the air itself, but also causes damage to the soil and water. Therefore, early prevention of environmental pollution issues becomes an urgent necessity. One of the efforts that can be done is to build a reliable gas detector based on functional materials, such as magnetite or zincite. However, preparing well-structured materials for gas sensing purposes is a challengeable task for many scientists and engineers. In this study, we synthesis the nano-sized cobalt-doped magnetite particles which were reinforced with micron-sized zincite. The composites were subjected to crystal structure characterization. We also discussed the theoretical basis for the composites as the possible gas sensing materials.

Keywords
Co-doped magnetite/zincite, gas sensing material, structural characteristic

Topic
Environmental Magnetism

Link: https://ifory.id/abstract/F4pJcbtCx7g9

Corresponding Author
Abdul Hakim

Institutions
1)Sains and Technology Faculty, Universitas Islam Negeri Sunan Ampel Surabaya, Jl. Ahmad Yani 117 Surabaya, Indonesia
2)Bandung Institute of Technology and Science

a) abdul.hakim[at]uinsby.ac.id b)argun.gmail.com

Abstract
Since 2006, Sidoarjo Mud Volcano Levee has been gradually elevated by The Sidoarjo Mud Volcano Management Center (PPLS). The levee was constructed to prevent hot mud volcano which unpredictably erupted and debatable amount of experts, whereas it-s flowing into surrounding areas. Analysis of embankment stability was conducted by Sukandi (2012) and Wijayanto (2017) at point 10 D and point 21 respectively. However, the eruption on it is not yet enough stopped although the quantity has decreased significantly. In case of the matter, PPLS as an authority of LUSI did some increased levee as an additional embankment. Nevertheless, the high embankment causes instability. They, moreover, built on the soft soil foundation that has made a big awareness to analyze the embankment stability, particularly on the point of 10 D. A finite element method (FEM) was used for evaluation of embankment stability and the result shows that the embankment undergoes displacement and factor of safety (FoS) is 1.7.a

Keywords
Sidoarjo mud volcano, stability, embankment, factor of safety.

Topic
Environmental Magnetism

Link: https://ifory.id/abstract/CNcvyQw3PH8M

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
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
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
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
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
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