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All Journal Nusantara Science and Technology Proceedings Jurnal Pendidikan Teknik Mesin
J. Jamari
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Struvite Crystallization Control with Addition of Maleic Acid in Liquid Waste as Fertilizer Materials Perwitasari, D. S.; A. P. Bayuseno; J. Jamari; S. Muryanto
Nusantara Science and Technology Proceedings International Seminar of Research Month Science and Technology for People Empowerment.
Publisher : Future Science

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Abstract

Struvite was magnesium ammonium phosphate (MgNH4PO4.6H2O) in the form of white orthorhombic crystals. In aqueous solutions containing Mg2+, NH4+ and PO42- in the equivalent amount of 1: 1: 1 molar ratio, struvite crystallization can occur spontaneously with the influence concentration maleic acid, temperature and stirred speeds. Struvite was a mineral crystal commonly found in pipes, pumps and other industrial equipment. Deposition of struvite can interfere with equipment performance and cause increased maintenance costs. The experiment was carried out in a batch process using 500 ml of mechanical glass at 200, 300 and 400 rpm. Maleic acid concentration as an additive 0.0; 1.0; 10.0; and 20.0 ppm in solution at 30oC and 40oC. The more amount of additive maleic acid concentration added, the smaller the rate constants value. By decreasing the constant rate, the growth of struvite crystals also decreases so that the growth of struvite crystals becomes inhibited, but different for stirring, the higher the stirred speeds the rate constants will increase so that crystal growth also increases. The crystals obtained were characterized using SEM-EDX and XRPD Rietveld. Characterization results show that struvite was the main crystal. The morphology of crystals was prismatic. The research has been carried out to increase understanding of the extraction of phosphate from industrial wastewater through struvite crystallization and was useful in prospective wastewater treatment technologies for phosphat recovery and has the potential that can be used as fertilizer.
Effect of Implant Diameter on Biomechanical Response of Straight Multi-Unit Abutments in Mandibular All-on-3: A 3D Finite Element Study Muhammad Iqbal Ramadhani; Kriswanto; Febri Budi Darsono; Rahmat Doni Widodo; J. Jamari; Athanasius Priharyoto Bayuseno
Jurnal Pendidikan Teknik Mesin Vol. 26 No. 01 (2026): June 2026 "Special issues for finite element analysis"
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v26i01.30115

Abstract

This study evaluates the biomechanical performance of varying implant fixture diameters in mandibular edentulous rehabilitation using the All-on-3 concept with straight multi-unit abutments. A three-dimensional finite element model of a mandible segment was constructed and subjected to static occlusal loading conditions derived from clinical bite force data. Three Brånemark-type implants with diameters of 3.75 mm, 4.0 mm, and 5.0 mm were analyzed using ANSYS Workbench to assess von Mises stress, equivalent strain, and factor of safety (FOS) in abutment and screw components. The results revealed that increasing the fixture diameter to 5.0 mm reduced von Mises stress by 12.8- 15.0% in abutments and 17-44.3% in screws across anterior and posterior positions. Similarly, strain decreased by up to 11.1% in abutments and 45.0% in screws. The highest FOS (37.48 for abutment, 25.09 for screw) was recorded at the 5.0 mm diameter, confirming enhanced safety margins. However, posterior implants experienced stress transfer from abutment to screw components as diameter increased, particularly due to local stiffness mismatch and cantilever effects. While all configurations remained below Ti-6Al-4V yield strength, the posterior 3.75 mm setup yielded the lowest FOS (1.45), suggesting a higher mechanical risk. These findings emphasize the need for careful diameter selection in posterior All-on-3 designs.
Co-Authors A. P. Bayuseno Athanasius Priharyoto Bayuseno Febri Budi Darsono Kriswanto Muhammad Iqbal Ramadhani Perwitasari, D. S. Rahmat Doni Widodo S. Muryanto