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This research investigated the alleged existence of potential landslides in front of the Kambal-Mulyorejo Highway section Ngantang District Malang Regency. The purposes of this research determined the subsurface geological structure in front of Highway Kambal – Mulyorejo, Ngantang subdistrict of Malang Regency, and to find out the potential landslides in this area. This research utilizes the Wenner configuration of the geoelectric resistivity method. Measurement was taken in 3 tracks with two tracks in the vertical direction and one track in the horizontal direction. Every track has 200 m with a space of electrode 10 m. Transition resistivity values use Res2dinV software that can provide 2D information from the color that can explain values from each layer resistivity. The three layers have one thing in common, namely the presence of a clay layer with a range of resistivity values of 1.74– 26.1 Ωm. Suspected on the first and third track, there is a slip plane. Because it was found that there's a layer that easily absorbs water but doesn't escape the water, so it will easily collapse when on a slope. In addition, this layer also follows the slope, so it was thought to be a slip plane. Meanwhile, in the second track, it was suspected that slip planes in there, this occurs because the waterproof layer tends to be flat and not tilted following the slope. [ABSTRACT FROM AUTHOR]

The study of pollution levels on vehicles is an important thing that needs to be studied more deeply by researchers to provide solutions to the pollution that occur due to pollution from vehicle emissions. Rock magnetization studies can be used to study various problems, such as pollution tests in the agricultural environment, rivers, and lakes. This research was conducted to develop new methods to determine the level of exhaust emissions of buses 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 tests 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) × 10-8 m3/kg with an average of 46.31 × 10-8 m3/kg with an average of χfd of 3.45%. The tourism bus emission samples have a range between (5.19 - 146.37) × 10-8 m3/kg with an average of 51.880 × 10-8 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 single stable domain (SSD). [ABSTRACT FROM AUTHOR]

Measurements of magnetic susceptibility have been performed for many purposes, such as to differentiate contaminated and non-contaminated soil, soil mapping, evaluate soil condition, and so forth. This study aims to understand the magnetic susceptibility profile and morphology of magnetic minerals on soils of the paddy plantation area in Madiun and Malang East Java. Samples were tested by Bartington MS2B magnetic susceptibility meter to identify magnetic susceptibility, and the image of Scanning Electron Microscope – Energy Dispersive X Ray (SEM-EDX) to see the morphology of magnetic minerals. Based on analysis data, both of paddy plantation area have an average of magnetic susceptibility low frequency (χlf) of about 167 × 10-8 m3/kg in Madiun plantation and about 210 × 10-8 m3/kg in Malang. The image of magnetic minerals strictly corresponds to magnetic susceptibility dependence frequency (χfd). The differences of volcanic ash contribution to that two areas are predicted to influence the magnetic mineral domain, which corresponds χfd. [ABSTRACT FROM AUTHOR]