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All Journal Communications in Science and Technology Perwira Journal of Science and Engineering (PJSE) IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA)
Harwijayanti, Widyanita
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Automotive Engineering Computer Science & IT Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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The renewable energy research contribution of Tanzania: A review Shame, Buruhan Haji; Ubaidillah; Tjahjana, Dominicus Danardono Dwi Prija; Arifin, Zainal; Aziz, Muhammad; Harwijayanti, Widyanita; Haji, Mohammed M.
Communications in Science and Technology Vol 9 No 1 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.1.2024.1348

Abstract

The central objectives of this study are to locate existing research on renewable energy, examine the energy policy of Tanzania, assess bibliometric factors, determine the direction of the current research, and comprehend unexplored research topics. This exploration focuses on a bibliometric-based study using computer-assisted software tools known as VOS viewer and RStudio in analyzing the Scopus data retrieved package for the key phrase of "Renewable energy" in the article titles published from 2002 to 2022. A total of 661 publications (which is only 0.45% and 6.3% of the global and continental publications from Africa respectively) were analysed after refining using different bibliometric criteria like study site, type of document, publication stage, language used in the document, and publication time interval. The results shows that Energy fuels, engineering, technology, environmental sciences, ecology, and business economics are the most frequently studied fields. Also, from a total of 661 publications, only 32 documents were published from Tanzania for 20 years from 2022 which is less than 2 publication/year. This study concludes that there is a notable lack of research output from Tanzania in this critical field. This gap underscores the need for greater investment in renewable energy research and development within the country, as well as targeted efforts to build research capacity and foster collaboration among academia, government, and industry stakeholders.
Pengaruh Pasir Silika sebagai Filler pada Komposit Berpengikat Poliester teradap Karakteristik Komposit Zulfikar Alief Utama, Iqbal; Yusron Wijanarko, Zidan; Bagus Prasetiyo, Angger; Harwijayanti, Widyanita; Whonica
Perwira Journal of Science & Engineering Vol 6 No 1 (2026)
Publisher : Universitas Perwira Purbalingga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54199/nrkhw323

Abstract

Pertumbuhan jumlah manusia dan perkembangan pembangunan di berbagai wilayah di dunia mempengaruhi mobilisasi manusia yang membutuhkan kendaraan untuk berpindah tempat dalam memenuhi kebutuhan. Untuk memenuhi kebutuhan kendaraan di perlukan material body kendaraan dengan material yang memiliki ketahanan terhadap uji mekanis. Komposit merupakan material unggul dimana tailorability (kekuatan) bisa disesuaikan dengan kebutuhan. Komposit polimer pada bidang otomotif dikembangkan  dengan kualifikasi ketahanan bakar yang baik. Pengembangan komposit polimer dapat dilakukan dengan filler sehingga menghasilkan material yang lebih unggul dan menghasilkan kinerja yang tinggi. Pasir Silika merupakan Geomaterial dengan istilah pasir kuarsa, pasir putih atau pasir industri. Secara umum pasir silika terdiri dari silikon dioksida ( SiO2 ). Pasir Silika memiliki sifat keunggulan apabila digunakan sebagai material manufaktur diantaranya adalah keras, memiliki titik leleh yang tinggi/ tahan panas, tahan terhadap tekanan dan abrasi. Resin yukalac 157 BQTN merupakan polimer jenis termosted poliester biasa diaplikasikan pada suhu kerja mencapai 79 ˚C. dengan berat jenis 1,3-1,4 kg/cm3.Penelitian ini bertujuan untuk mengetahui karakteristik komposit geopolimer antara pasir silica dan polimer yukalac 157 BQTN terhadap kekuatan lentur dan kekuatan tarik.
Pengaruh Parameter Sintering terhadap Stabilitas Fasa dan Struktur Mikro pada Komposit Titanium-Hidroksiapatit dengan Teknologi Serbuk: Review Harwijayanti, Widyanita; Hidayat, Tubagus Adytia Syarief
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.380

Abstract

The increasing demand for orthopedic implants has driven the development of metals as biomedical materials. However, metals exhibit limited bioactivity, necessitating modifications to enhance their biological integration. One widely developed method is the fabrication of Titanium-Hydroxyapatite (Ti-HA) composites via powder metallurgy, utilizing hydroxyapatite for its similarity to human bone composition. This review analyzes 16 articles from Scopus and Google Scholar (2005-2023) based on material types, powder metallurgy parameters, and the physicochemical characterization of Ti-HA composites. The powder metallurgy process involves mixing, compaction, and sintering, during which the final properties are significantly influenced by the atmosphere, temperature, and holding time. A critical challenge is thermal stability, as hydroxyapatite decomposes above 800°C and titanium undergoes crystalline structural transformation beyond 882.5°C. During sintering, interparticle bonding and diffusion processes occur, triggering new phase formations and alterations in surface morphology. This process results in a final Ti-HA composite composition consisting of Titanium (Ti), Calcium (Ca), Phosphorus (P), and Oxygen (O). This study underscores the importance of precise control of temperature parameters to maintain material integrity during fabrication.
Co-Authors Angger Bagus Prasetiyo Danardono Dwi Prija Tjahjana, Dominicus Haji, Mohammed M. Hidayat, Tubagus Adytia Syarief Muhammad Aziz Shame, Buruhan Haji Ubaidillah Whonica Zainal Arifin Zidan Yusron Wijanarko Zulfikar Alief Utama, Iqbal