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All Journal Spatial : Wahana Komunikasi dan Informasi Geografi International Journal of Applied Mathematics, Sciences, and Technology for National Defense
Imastuti
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Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Earth & Planetary Sciences Mathematics Physics

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Eksplorasi Geomarine untuk Identifikasi Logam Tanah Jarang untuk Mendukung Industri Pertahanan: Studi Kasus Perairan Sabang Lestari, Filya Rizky; Saputra, Indra Adhitiya Rama; Imastuti; Prayoga, Bagas Arya
Jurnal Spatial Wahana Komunikasi dan Informasi Geografi Vol. 25 No. 1 (2025): SPATIAL: Wahana Komunikasi dan Informasi Geografi
Publisher : Department Geography Education Faculty of Social Science - Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/spatial.251.005

Abstract

The strategic importance of national defense is closely related to natural resources, strategic material reserves, particularly Rare Earth Elements (REE), and the national defense industry, which is crucial for achieving defense independence. However, the exploration of REE in Indonesia has not been optimally conducted despite its vast geological potential. This research focused on mapping the distribution of REE in the Sabang Waters by applying geomarine exploration methods supported by seismic data analysis and sediment sampling. The analysis utilized seismic facies interpretation within a quantitative framework. Findings revealed a spatial association between REE distribution and geological structures influenced by volcanic activity, particularly fumaroles. These geological features potentially indicate new REE-bearing zones in shallow marine environments. This association is proposed as a new approach to REE exploration in marine tectonic settings. The research highlights the relevance of integrating remote sensing and geological data in mapping strategic minerals to support defense industry resilience.
Analysis of submerged breakwater models using ripple tank Mutmainnah; Wulandari, Viviq Ardita; Argus, Roman; Atmadi; Pratiwi, Raditya Faradina; Imastuti
International Journal of Applied Mathematics, Sciences, and Technology for National Defense Vol. 1 No. 2 (2023): International Journal of Applied Mathematics, Sciences, and Technology for Nati
Publisher : FoundAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/app.sci.def.v1i2.222

Abstract

A breakwater is an infrastructure that functions to dampen wave energy. To secure the area directly adjacent to the coast, an effective breakwater model is needed based on the analysis of the dissipation coefficient value ( ). This study aims to determine a good breaker model based on the  value using a ripple tank. The data analyzed were wave heights before and after passing through the breakwaters of the three concrete models whose arrangement was varied. The results showed that the breaker model that is effective in reducing wave energy is the Grooved cube model with holes arranged horizontally based on the resulting small reflection coefficient ( ) and transmission coefficient ( ) values and large  values
Development of magnetic materials for cobalt titanium oxide using mechanical milling and the characterization methods Imastuti; Ari, Adi Wisnu; Mutmainnah, Mutmainnah; Putri, Haziza Elsa; Pratiwi, Raditya Faradina; Atmadi
International Journal of Applied Mathematics, Sciences, and Technology for National Defense Vol. 1 No. 2 (2023): International Journal of Applied Mathematics, Sciences, and Technology for Nati
Publisher : FoundAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/app.sci.def.v1i2.224

Abstract

In the synthesis of magnetic materials for absorbing radar waves, it is necessary to have a base material that has unique magnetic properties that can reach the broadband characteristics of radar frequencies. Cobalt titanium oxide is synthesized using mechanical milling. The phase formed by calcination at 1000℃ with a holding time of 5 hours. Sample characterization was carried out by XRD, VSM and VNA. Based on the research results, it was found that the material obtained had semiparamagnetic properties. From the SEM measurements, it is reactive to the sintering temperature. Radar wave absorption measured by VNA shows that cobalt titanium oxide shows a value with uniform absorption in the X-band wave.
Co-Authors Argus, Roman Ari, Adi Wisnu Atmadi Lestari, Filya Rizky Mutmainnah Pratiwi, Raditya Faradina Prayoga, Bagas Arya Putri, Haziza Elsa Saputra, Indra Adhitiya Rama Syamsiar, Syamsiar Wulandari, Viviq Ardita