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INDONESIA
Jurnal Teknologi
Published by Universitas Muhammadiyah Jakarta
ISSN : 20851669     EISSN : 24600288     DOI : -
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering
This journal is a scientific journal to develop knowledge in the field of Engineering & Technology. Editors invite professionals from education and researcher to write about the progress of science in the field of Engineering & Technology. The journal is published 2 (two) times in 1 year.
Arjuna Subject : -
Articles 255 Documents
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STUDI PENGEMBANGAN NANOFLUIDA HIJAU BERASAL DARI BAHAN LOKAL ALAM UNTUK APLIKASI DI BIDANG TEKNIK Kushendarsyah Saptaji; Alvika Meta Sari; Anwar Ilmar Ramadhan; Istianto Budhi Rahardja; Muhammad Dadi Saputra; Firmansyah Firmansyah; Efrizon Umar
Jurnal Teknologi Vol 15, No 2 (2023): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.15.2.345-358

Abstract

The increase in energy demand causes a continuous increase in global temperatures exceeding pre-industrial temperatures with the release of toxic gases and radiation causing severe climate conditions. So, it is mandatory to develop durable and highly efficient thermal systems to overcome these problems. There has been much research into nanofluids to improve performance in thermal applications and have gained significant attention over the past few years due to their superior qualities. Additionally, other undesirable effects such as corrosion of equipment, non-biodegradable by-products occur due to the presence of strong chemicals. Therefore, the development of cost-effective and environmentally friendly nanofluids has emerged as a fast-growing alternative research field with many enthusiasts. The current review provides a comprehensive view of the various techniques used in the preparation of green nanofluids using several natural extracts. The unique morphology, optical properties, stability, high surface area, lower toxicity, and improved thermo-physical properties of green nanoparticles make them favorable choice candidates in enhancing the performance of thermal systems.
ANALISIS FAKTOR YANG BERPENGARUH DALAM PENERAPAN KONSEP GREEN PADA BANGUNAN FLOUR MILL PLANT MENGGUNAKAN SEM-PLS Iwan Kurniawan; Albert Eddy Husin
Jurnal Teknologi Vol 15, No 2 (2023): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.15.2.275-286

Abstract

The Main Building of the Flour Mill Plant is the main part of the wheat flour mill consisting of Wheat Bins, Process Area, Finish Bins, Laboratory, and Buck Loading Area. The construction of factory buildings that apply the Green concept is urgently needed, this is to the mission of the Sustainable Development Goals 2030, that by 2030 the new development will have a concept of 100% and an existing building of 60%. To reduce the environmental burden on an industry, it is necessary to build and develop a factory building with a green concept. The Implementation of the Green Concept to the Main Building of the Flour Mill Plant using Structural Equation Modeling – Part Least Square (SEM-PLS). The result of this study is that there are "10 factors that affect the cost performance of the Green Building Flour Mill Plant project", Project Manager Performance, Energy Efficiency, Technical Specifications, Provision of Parking Lots, Management Commitment, Water Sources, Analysis Functions, Waste Handling Systems, Selection of Alternative Materials, and Energy Costs.
SINTESA NANO ZIRKON DARI PASIR ZIRKON LOKAL DENGAN METODE FUSI KAUSTIK SODA-PRESIPITASI-KALSINASI Alvika Meta Sari; Efrizon Umar; Djoko Hadi Prajitno; Rian Fitriana; Anwar Ilmar Ramadhan; Firmansyah Firmansyah; Istianto Budhi Rahardja; Akmal Imam Faisal; Fikriyansyah Fikriyansyah
Jurnal Teknologi Vol 15, No 2 (2023): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.15.2.189-198

Abstract

Indonesia is one of countries that has the potential of mineral natural resources in the form of zircon sand. Zircon sand is a raw material that has the potential to be synthesized into nano zircon because of its ingredients of zircon oxide (ZrO2). In this study the aim was to study the aim to synthesize nano zircon from local zircon sand from Kalimantan using caustic soda-precipitation-calcination modification method. Nano zircon was prepared in this study by modifying existing methods, namely caustic fusion, washing, acid leaching using hydrochloric acid, precipitation using ammonia and calcination processes to produce nano zircon in the form of white powder. The efficiency of the process was analyzed by calculating the yield of the product formed, then the FTIR (Fourier Transform Infra-Red) spectroscopic test was performed to determine the functional groups of nano zircons and the morphology was analyzed using SEM (Scanning Electron Microscopy). Yield obtained is 2.7%  with the size of nano zircon is 41.983 nm. The FTIR spectrum shows the presence of the-Zr-O2 functional group at wave numbers 600 – 700 cm-1.
PENGARUH ALGINAT SEBAGAI EDIBLE COATING TERHADAP KUALITAS BUAH POTONG KLIMAKTERIK: KAJIAN PUSTAKA Armina Meikyo Puspitasari; Hermawan Seftiono
Jurnal Teknologi Vol 15, No 2 (2023): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.15.2.305-314

Abstract

The effect of alginate on the quality of climacteric fresh cut fruits stored in refrigerator temperatures (2–5 °C) for 12–16 days was studied. The control (uncoated) and coated with alginate with various concentrations based on this study were analyzed their the physical (weight loss, texture, and color), chemical (pH, total soluble solids content, and titratable acidity), microbiological (total plate count and yeast and mold), and sensory characteristics. Weight loss and texture analysis showed that 1.5% alginate could inhibiting weight loss and maintaining hardness in fresh cut apple. Color analysis showed that 2% alginate could inhibiting °hue rate, that slowing color changes in fresh cut papaya. Analysis of pH, total soluble solids content, and titratable acidity showed that 2% alginate can maintaining pH value of fresh cut apricot, delaying of sugar utilization as substrate in respiration of fresh cut papaya, and maintaining organic acid in fresh cut kiwi. Total plate count and mold and yeast analysis showed that 1% alginate could inhibiting contamination of fresh cut watermelon and inhibiting the growth of mold and yeast in fresh cut yellow melon. Sensory evaluation analysis showed that 2% alginate could maintaining sensory characteristics in fresh cut guava. Alginate was effectively reduced respiration rate, transpiration, lowering of organic acids utilization, and inhibiting the growth of bacteria, mold and yeast until 12 days. Based on 25 studies 1.5% alginate plays a role in physical parameter (weight loss and texture). 2% Alginate plays a role in chemical parameters and 1% alginate inhibiting microorganism.
FLEXURAL STRENGTH OF PINEAPPLE LEAF FIBER REINFORCED METAKAOLIN ZIRCONIA CARBONATE APATITE GEOPOLYMER COMPOSITE Andrie Harmaji; Susanti Nurfadhila; Bambang Sunendar
Jurnal Teknologi Vol 15, No 2 (2023): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.15.2.237-246

Abstract

Developments in the materials engineering have encouraged the incorporation of minerals such as kaolin, zirconia, and carbonate apatite, and natural materials. Indonesia, which has a tropical climate, is overgrown with pineapple plants. Geopolymer is a brittle ceramic material so it is necessary to increase its flexural strength value for composite application. Pineapple leaf fiber can be used as reinforcement in geopolymer composites. This study aims to analyze the effect of adding pineapple leaf fiber (Ananas comosus (L.) Merr.) to the mechanical properties and morphological characteristics of metakaolin-zirconia-carbonate apatite-based geopolymer composites. The use of chitosan coupling agent as a binder between the matrix and filler. The research sample consisted of 4 groups with a total of 5 samples in each group. Fiber varied 0-4% in Geopolymer Composites. Geopolymer Composite samples were tested for flexural strength and Scanning Electron Microscope (SEM). The test results showed that the addition of pineapple leaf fiber increased the flexural strength of the geopolymer composite. The composite without the addition of fiber had a flexural strength of 11.24 MPa, while the addition of 1%, 2.5%, and 4% pineapple fiber resulted in a flexural strength of 20.71 MPa, 11.57 MPa, and 11.01 MPa. The results of the SEM test show a picture of the void with varying sizes. The SEM Images of composite with the addition of 4% pineapple fiber showed the formation of Na2CO3 which explained the decrease in flexural strength compared to the sample without pineapple fiber addition.

Page 26 of 26 | Total Record : 255

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