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All Journal International Journal of Applied Mathematics, Sciences, and Technology for National Defense
Mutmainnah Mutmainnah
Indonesia Defense University
Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Mathematics Physics

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Analysis of submerged breakwater models using ripple tank Mutmainnah Mutmainnah; Viviq Ardita Wulandari; Roman Argus; Atmadi Atmadi; Raditya Faradina Pratiwi; Imatuti 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 Natio
Publisher : Foundation of Advanced Education

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 Imastuti; Adi Wisnu Ari; Mutmainnah Mutmainnah; Haziza Elsa Putri; Raditya Faradina Pratiwi; Atmadi 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 Natio
Publisher : Foundation of Advanced Education

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 Adi Wisnu Ari Atmadi Atmadi Haziza Elsa Putri Imastuti Imastuti Imatuti Imastuti Raditya Faradina Pratiwi Raditya Faradina Pratiwi Roman Argus Viviq Ardita Wulandari