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Prediction of Shrinkage Porosity in Femoral Stem of Titanium Investment Casting

null null Muslim Mahardika A. Syamsudin
Archives of Foundry Engineering | 2016 | No 4 | DOI: 10.1515/afe-2016-0102
Słowa kluczowe Femoral stem Shrinkage porosity Commercially pure titanium Investment casting
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Abstrakt

Design of gating system is an important factor in obtaining defect-free casting. One of the casting defects is a porosity caused by internal

shrinkage in solidification process. Prediction of the internal shrinkage porosity in the femoral stem of commercially pure titanium (CP-Ti)

is investigated based on the gating system design. The objective of this research is to get the best gating system between three gating

system designs. Three gating system designs of the femoral stem were simulated in an investment casting method. The internal shrinkage

porosity occurs on the largest part and near the ingate of the femoral stem. The gating system design that has ingates cross section area:

78.5; 157; and 128.5 mm2

has the least of the internal shrinkage porosity. This design has the most uniform solidification in the entire of

the femoral stem. An experiment is conducted to validate the simulation data. The results of internal shrinkage porosity in the three gating

system designs in the simulation were compared with the experiment. Based on the comparison, the trend of internal shrinkage porosity at

the three gating system designs in the simulation agrees with the experiment. The results of this study will aid in the elimination of casting

defect.

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Autorzy i Afiliacje

null null
Muslim Mahardika
A. Syamsudin

Bandwidth enhancement for QMSIW antenna by using dual cavity and triangle slot

Dian Widi Astuti Juprida Parrona Purba Muslim Muslim Imelda Uli Vistalina Simanjuntak Yuliza Yuliza Fina Supegina Syah Alam Setiyo Budiyanto
International Journal of Electronics and Telecommunications | 2024 | vol. 70 | No 2 | 519-524 | DOI: 10.24425/ijet.2024.149574
Słowa kluczowe dual resonant frequencies QMSIW dual cavity triangle slot bandwidth enhancement
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Abstrakt

The miniaturization of substrate-integrated waveguide (SIW) antenna suffers from the narrow impedance bandwidth. It occurs on the quarter mode substrate integrated waveguide (QMSIW) antenna that has 75% miniaturization of the full mode SIW. This research proposed the bandwidth enhancement for QMSIW antenna by using dual cavity and triangle slot. The QMSIW antenna feeds in a single port. The impedance bandwidth simulation has an 8.6% fractional bandwidth improved with dual resonant frequencies. The simulation result was validated with the measured impedance bandwidth.
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Autorzy i Afiliacje

Dian Widi Astuti
1
Juprida Parrona Purba
1
Muslim Muslim
1
Imelda Uli Vistalina Simanjuntak
1
Yuliza Yuliza
1
Fina Supegina
1
Syah Alam
2
Setiyo Budiyanto
1
  1. Department of Electrical Engineering, Universitas Mercu Buana, Jakarta, Indonesia
  2. Electrical Engineering, Faculty of Engineering, Universitas Trisakti, Indonesia

Bandwidth Enhancement for Half Mode Substrate Integrated Wave guide Antenna using Defected Ground Structures

Dian Widi Astuti Rivayanto Muslim Imelda Simanjuntak Teguh Firmansyah Dwi Astuti Cahyasiwi Yus Natali
International Journal of Electronics and Telecommunications | 2023 | vol. 69 | No 3 | 449-454 | DOI: 10.24425/ijet.2023.144382
Słowa kluczowe Bandwidth enhancement dual cavity half modesubstrate integrated waveguide defected ground structure U-slot
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Abstrakt

The SIW antenna suffers from the narrow bandwidth for a single cavity and single resonant. Defected ground structure (DGS) with a dual cavity was the solution to solve narrow bandwidth by resulting in hybrid resonance. The hybrid resonance with 14.83% impedance bandwidth is proposed in this antenna design. The first resonance resulted from the combination of the TE101 modes from inner and outer HMSIW cavities while the second resonance resulted from the combination of the strong TE101 and the weak TE102 mode from the inner HMSIW cavity and the addition of the weak TE101 from the outer HMSIW cavity. The measurement antenna design has a broadband antenna with a 14.31% (5.71 – 6.59 GHz) impedance bandwidth by using substrate Rogers RO 5880.
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Autorzy i Afiliacje

Dian Widi Astuti
1
Rivayanto
1
Muslim
1
Imelda Simanjuntak
1
Teguh Firmansyah
2
Dwi Astuti Cahyasiwi
3
Yus Natali
4
  1. Department of Electrical Engineering, Universitas Mercu Buana, Jakarta, Indonesia
  2. Department of Electrical Engineering, Universitas Sultan Ageng Tirtayasa, Serang, Indonesia
  3. Department of Electrical Engineering, Universitas Muhammadiyah Prof. Dr. HAMKA, Jakarta, Indonesia
  4. Telecommunication Program, Universitas Telkom, Jakarta, Indonesia

Remelting of Aluminum Scrap Into Billets Using Direct Chill Casting

Kardo Rajagukguk Suyitno Suyitno Harwin Saptoadi I. K. Indraswari Kusumaningtyas Budi Arifvianto Muslim Mahardika
Archives of Foundry Engineering | 2024 | vol. 24 | No 1 | 40-49 | DOI: 10.24425/afe.2024.149250
Słowa kluczowe Direct chill casting Recycling aluminum scrap Microstructure Mechanical properties Macrosegregation
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Abstrakt

An as-cast aluminum billet with a diameter of 100 mm has been successfully prepared from aluminum scrap by using direct chill (DC) casting method. This study aims to investigate the microstructure and mechanical properties of such as-cast billets. Four locations along a cross-section of the as-cast billet radius were evaluated. The results show that the structures of the as-cast billet are a thin layer of coarse columnar grains at the solidified shell, feathery grains at the half radius of the billet, and coarse equiaxed grains at the billet center. The grain size tends to decrease from the center to the surface of the as-cast billet. The ultimate tensile strength (UTS) and the hardness values obtained from this research slightly increase from the center to the surface of the as-cast billet. The distribution of Mg, Fe, and Si elements over the cross-section of the as-cast billet is inhomogeneous. The segregation analysis shows that Si has negative segregation towards the surface, positive segregation at the middle, and negative segregation at the center of the as-cast billet. On the other hand, the Mg element is distributed uniformly in small quantities in the cross-section of the as-cast billet.
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Bibliografia

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Autorzy i Afiliacje

Kardo Rajagukguk
1 2 4
ORCID: ORCID
Suyitno Suyitno
3 4
Harwin Saptoadi
1
I. K. Indraswari Kusumaningtyas
1
Budi Arifvianto
1 4
Muslim Mahardika
1 4
  1. Department of Mechanical and Industrial Engineering, Faculty of Engineering, Universitas Gadjah Mada, Jl. Grafika 2, Yogyakarta 55281, Indonesia
  2. Department of Mechanical Engineering, Institut Teknologi Sumatera (ITERA), Jl. Terusan Ryacudu, South Lampung, Lampung 35365, Indonesia
  3. Department of Mechanical Engineering, Faculty of Engineering, Universitas Tidar, Jl. Kapten Suparman 39, North Magelang, 56116, Indonesia
  4. Center for Innovation of Medical Equipment and Devices (CIMEDs), Universitas Gadjah Mada, Jl. Teknika Utara Yogyakarta 55281, Indonesia

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