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All Journal Rekayasa Mesin JST ( Jurnal Sains Terapan ) Jurnal Teknik Indonesian Physical Review Specta Journal of Technology Indonesian Applied Physics Letters PIKAT
Tajalla, Gusti Umindya Nur
Institut Teknologi Kalimantan
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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Karakterisasi Sifat Termofisika Paduan Titanium Ti6Al4V Tajalla, Gusti Umindya Nur; Ismail, Andi Idhil
Jurnal Rekayasa Mesin Vol 11, No 2 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.02.2

Abstract

Manufacturers are pushed to use superalloys such as titanium alloys in the aerospace part due to environmental and economic issues. The refractory properties of titanium alloys result in rapid and premature wear of the cutting tools, especially by thermal diffusion. Therefore, the purpose of this paper is to focus on understanding the characterization of TiAl6V4 in thermo-physic properties. X-ray diffraction (XRD), scanning electron microscope (SEM), electrical resistivity against temperature test, and differential scanning calorimetry (DSC) were conducted to analyze the relationship of phase transformation to thermal properties. Phase analysis showed that TiAl6V4 is composed of two-phase a and b creating a duplex microstructure in which the surface fraction contains about 92,5 % and 7,5 %, respectively. Electrical resistivity against temperature test demonstrated the phase transformation of a to b occurred at 1017°C. This study revealed that the phenomena of phase transformation affected the thermal properties, i.e., thermal capacity, thermal diffusivity, and coefficient of thermal expansion.
Extraction and Characterization of Cellulose from Yellow Meranti (Shore macrobalanos) Sawdust Waste Gusti Umindya Nur Tajalla; Sabrina Humaira; Ade Wahyu Yusariarta Putra Parmita; Ainun Zulfikar
JST (Jurnal Sains Terapan) Vol 5, No 2 (2019): JST (Jurnal Sains Terapan)
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat, Politeknik Negeri Balikpapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32487/jst.v5i2.704

Abstract

Meranti (Shorea macrobalanos) is a typical wood from Kalimantan that is still valued as a raw material of furniture production. According to statistical data, meranti sawdust waste reached 44% and has not been widely used. It is known that meranti has a high lignocellulose content, which are 38.18% of lignin, 26.03% of hemicellulose and 40.33% of cellulose. Due to the high cellulose level, meranti becomes an alternative source of cellulose which can be applied in composites, biomaterials, and membranes. Therefore, this study aims to produce cellulose from yellow meranti sawdust waste using an alkali treatment, NaOH 17.5%, with a variation of extract time of 20, 40, and 60 minutes. Cellulose characterization was performed using the Chesson-Datta method, Fourier-transferred Infrared Spectroscopy (FTIR), and Scanning Electron Microscope (SEM). The Chesson-Datta test showed that cellulose concentration escalated by increasing process time, which is 45%, 47% and 53% at 20, 40, and 60 minutes respectively. Increased levels of cellulose were followed by decreasing concentrations of lignin and hemicellulose. The FTIR results presented a strengthening of the intensity in the C-O-C functional group which indicated an increase in cellulose levels. Meanwhile, a decrease intensity was also revealed in the aromatic C=C and C=O groups, which implied a reduction in the amount of lignin and hemicellulose. Through the SEM, the surfaces were recognizably less dense by increasing extract time. It is because of the degradation of lignin and hemicellulose. Herein, the most optimum yield was achieved in 60 minutes to produce up to 53% of cellulose. Thus, yellow meranti sawdust waste has a high potential source of cellulose.Keywords: yellow meranti, alkali treatment, cellulose Abstrak       Meranti (Shoreamacrobalanos) merupakan kayu khas Kalimantan yang saat ini masih dimanfaatkan sebagai bahan baku pembuatan furnitur. Menurut data statistik, limbah serbuk kayu meranti yang dihasilkan mencapai 44% dan belum banyak dimanfaatkan. Telah diketahui bahwa meranti memiliki kandungan lignoselulosa yang cukup tinggi, yaitu 38,18% lignin, 26,03% hemiselulosa, dan 40,33% selulosa. Dengan kandungan selulosa yang tinggi, meranti menjadi salah satu alternative sumber selulosa yang kemudian dapat diaplikasikan di bidang komposit, biomaterial, dan membran. Oleh karena itu, penelitian ini bertujuan untuk menghasilkan selulosa dari limbah serbuk meranti kuning dengan menggunakan metode alkalisasi, NaOH 17,5%, dengan variasi waktu ekstrak selama 20, 40, dan 60 menit. Karakterisasi selulosa dilakukan dengan menggunakan uji Chesson-Datta, fourier-transferred infrared (FTIR), dan scanning electron microscope (SEM). Uji Chesson-Datta menunjukkan semakin lama waktu alkalisasi dapat meningkatkan konsentrasi selulosa, yaitu 45%, 47% dan 53% pada waktu alkalisasi 20, 40, dan 60 menit. Peningkatan kadar selulosa diikuti dengan menurunnya konsentrasi lignin dan hemiselulosa. Hasil FTIR menunjukkan penurunan intensitas pada gugus C=O yang mengindikasikan adanya penurunan jumlah lignin dan hemiselulosa seiring dengan meningkatnya waktu. Hasil morfologi SEM juga menunjukkan permukaan yang semakin tidak rapat seiring dengan meningkatnya waktu alkalisasi. Hal ini diakibatkan terjadi degradasi lignin dan hemiselulosa. Pada penelitian ini, hasil paling optimum dicapai pada waktu 60 menit dengan menghasilkan selulosa hingga 53%. Sehingga, limbah serbuk meranti memiliki potensi sebagai sumber selulosa yang cukup tinggi. Kata kunci:  meranti kuning, alkalisasi, selulosa
Characterization of Bark-Midrib Fibers using Chemical Treatment Variations as Reinforcement in Bark-Midrib Fiber Composites Oliever Andrea Parusha; Muhammad Nurhidayatur Rozikin; Andromeda Dwi Laksono; Gusti Umindya Nur Tajalla; Nabilla Amalia Putri; Fitriana Maharani Fatchur Rochim
SPECTA Journal of Technology Vol. 3 No. 2 (2019): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (736.424 KB) | DOI: 10.35718/specta.v3i2.154

Abstract

Bark midrib are not fully utilized. Utilize the characterization of the fiber and process it into polymer composites with natural fiber reinforcement. The study was conducted using a variety of chemical treatments in the form of bark midribs without treatment, delignification treatment that is immersion using NaOH media concentration of 1%, 5%, 10% with 3 hours immersion time and bleaching treatment using H2O2 media 2% concentration with immersion time 30, 60 and 90 minutes. In obtaining suitable properties, tensile tests, impact tests, Scanning Electron Microscopy (SEM) images, and Fourier-Transform Infra-Red (FTIR) tests are performed. Optimal delignification treatment at 5% NaOH concentration with a tensile test value of 25.47 MPa (increasing 76.86%) and an impact test value of 11.95 kJ/m2 (increasing 11.45%). The optimal bleaching treatment at 90 minutes immersion with a tensile test value of 35.09 MPa (increased 36.36%) and impact test value of 13.77 kJ/m2 (increased 15.22%). The results of SEM images show that the bark midrib fiber composite without treatment has a lousy interface, delignification treatment with a reasonable good interface, and bleaching treatment with an excellent interface. FTIR test results showed that the bark midrib fiber composite without treatment had a cellulose component but hemicellulose and lignin levels still dominated. Based on the results of the study, bark midrib fiber with delignification chemical treatment using 5% NaOH for 3 hours followed by bleaching treatment using 2% H2O2 for 90 minutes is the treatment with the best results and then applied to a natural fiber composite product.
PENINGKATAN MINAT BACA GEN-Z DI DESA SEBAKUNG KABUPATEN PASER MELALUI PENGEMBANGAN TAMAN BACAAN Yunita Triana; Winardi Dian Wahyu Pratama; Dini Indrawati; Meutya Dwi Leoriza; Gusti Umindya Nur Tajalla; Ade Wahyu Yusariarta; Jatmoko Awali
Jurnal Pengabdian Kepada Masyarakat ITK (PIKAT) Vol. 4 No. 2 (2023): PIKAT : Jurnal Pengabdian Kepada Masyarakat
Publisher : LPPM Institut Teknologi Kalimantan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/pikat.v4i2.1075

Abstract

Desa Sebakung di Kabupaten Pasir, Provinsi Kalimantan Timur memiliki luas wilayah sekitar 3,94 km² dengan jumlah penduduk sekitar 1.415 jiwa. Salah satu permasalahan di desa Sebakung adalah rendahnya minat baca masyarakat yang disebabkan oleh kurangnya akses terhadap bahan bacaan yang memadai dan minimnya kesadaran dan budaya membaca di kalangan masyarakat desa Sebakung. Untuk mengatasi permasalahan minat baca di desa Sebakung, maka dilakukan pengembangan taman bacaan desa melalui beberapa tahap. Pada tahap persiapan dilakukan dengan melakukan survey dan observasi ke Desa Sebakung. Pada tahap pelaksanaan dilakukan dengan beberapa kegiatan seperti mempersiapkan peralatan untuk pengembangan taman bacaan, penerapan teknologi tepat guna (TTG), dan melakukan sosialisasi dan kampanye untuk meningkatkan kesadaran dan budaya membaca di Desa Sebakung. Selanjutnya, tahap evaluasi dilakukan dengan menganalisis minat baca anak-anak melalui jumlah kunjungan ke taman bacaan selama 12 minggu dan diperoleh grafik yang stabil. Dari hasil tersebut dapat disimpulkan bahwa terjadi peningkatan minat baca gen-z di Desa Sebakung melalui program ini.
The Characteristics of Polyester Concrete with Local Sand of East Borneo as Filter Dewi, Asti Lolita; Tanjung, Rifqi Aulia; Tajalla, Gusti Umindya Nur; Parmita, Ade Wahyu Yusariarta Putra
Indonesian Applied Physics Letters Vol. 5 No. 1 (2024): June 2024
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/iapl.v5i1.58323

Abstract

Concrete is a mixture of coarse aggregate and fine aggregate mixed with water and cement as a binder and filler. The disadvantages of traditional concrete are that high water absorption causes low chemical resistance, low modulus of elasticity, low impact strength and a long hardening time to reach its maximum properties, namely 28 days. The solution to these shortcomings that is being developed for construction material applications is by using polymers as polymer concrete. In this research, polyester resin and sand aggregate were used as basic materials. Polyester resin is a type of thermosetting polymer that is widely used in various applications such as automotive parts, composites and construction because of its suitable processing characteristics and affordable price. Meanwhile, the sand used is local Kalimantan sand, where from the XRF and XRD test results, local Kalimantan sand is included in the silica sand type. This research varies the weight fraction of polyester resin used to determine its effect on polymer concrete characteristics such as porosity, water absorption, compressive strength, and macro observations. Variations in the polymer weight fraction used were 20%, 25% and 30%. Compressive strength testing was carried out at the age of 7 days of concrete. The results of the porosity test show that the average porosity of all variations is ± 0.5%. Meanwhile, the average value of water absorption for all fractions is 0.2%. And the highest average value of compressive strength in the 30% polyester resin weight fraction was 66.9 MPa. So it can be concluded that all variations meet SNI standards to become concrete materials.
Karakteristik Termal Material Komposit Berbahan Dasar Polipropilena dan Batang Pisang Tajalla, Gusti Umindya Nur; Andriansyah, Prisky; Riyadi, Ilham Tri; Vadila, Mei Lisa Nur; Laksono, Andromeda Dwi
Jurnal Teknik: Media Pengembangan Ilmu dan Aplikasi Teknik Vol 23 No 1 (2024): Jurnal Teknik - Media Pengembangan Ilmu dan Aplikasi Teknik
Publisher : Fakultas Teknik - Universitas Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55893/jt.vol23no1.554

Abstract

Thermal insulation in a residence can help keep the room's temperature stable, allowing maximum comfort at work and relaxation. Because of its low thermal conductivity value of 0.1166 W/mK, banana stem fiber (BP) is an environmentally friendly thermal insulation material, while the matrix uses polypropylene (PP). Because excessive polypropylene production can pollute the environment, recycled polypropylene (PPDU) should be investigated as a candidate matrix. This study employs compression molding at a pressure of 8 MPa and a temperature of 170 °C for 60 minutes, with volume fractions of banana stem fibers varying by 10%, 30%, and 50%, as well as different matrix types, namely PP and PPDU. The manufacturing results were then evaluated using density and thermal conductivity tests. The density testing results for BP/PP and BP/PPDU decreased as more volume fractions were added. This phenomenon can occur as a result of void formation during the manufacturing process. Furthermore, the thermal conductivity values for BP/PP increased from 0.37 to 0.89 W/mK and from 0.58 to 0.94 W/mK for BP/PPDU, respectively. The lower the thermal conductivity value, the smaller the volume fraction of fiber. Similarly, pure PP is preferable because it has lower conductivity values than PPDU.
Penambahan Ekstrak Ranting Karamunting (Rhodomyrtus Temenosa) Sebagai Inhibitor Alami Pada Baja AISI 1040 Yanti, Lisda; Darma, Daffa Irsyad; Rifani, Muhammad; Tajalla, Gusti Umindya Nur; Awali, Jatmoko; Mohd, Yusairie; Triana, Yunita
SPECTA Journal of Technology Vol. 7 No. 2 (2023): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v7i2.925

Abstract

  In this study, Karamunting twig extract (Rhodomystus tementosa) was used as a natural inhibitor on AISI 1040 steel. Based on the results of functional group analysis, it was confirmed that the compounds found in Karamunting twig extract are tannins and flavonoids. Electrochemical analysis using the potentiodynamic method showed the lowest corrosion rate at 300 ppm inhibitor concentration, with a corrosion rate of 2.881 mm/yr with an inhibition efficiency of 76.732%. Furthermore, the EIS test showed the highest inhibition efficiency at a concentration of 300 ppm, with a value of 66.720%.
SYNTHESIS OF SINGLE-PHASE HYDROXYAPATITE POWDER FROM EGGSHELL WASTE VIA CO-PRECIPITATION METHOD AND ITS STRUCTURAL CHARACTERIZATION Musyarofah, Musyarofah; Mahera, Adinda Kholif; Tajalla, Gusti Umindya Nur; Nafisah, Azmia Rizka; Prayitno, Budi; Norhidayah, Siti; Kartika, Siska Ayu
Indonesian Physical Review Vol. 8 No. 3 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i3.451

Abstract

This study aims to synthesize a single-phase hydroxyapatite powder using waste chicken eggshells as a calcium source via the co-precipitation method. The process focuses on optimizing calcination time and temperature to achieve high-purity hydroxyapatite.  The co-precipitation procedure involved controlled pH adjustment and aging time, contributing to the formation of homogeneous particles. Chicken eggshells, predominantly composed of calcium carbonate (CaCO3), were calcined at 1000°C for 15 hours to produce calcium oxide (CaO). The resulting CaO was then reacted with phosphate ions in an aqueous solution, followed by a calcination at 900°C for varying holding times of 5 and 10 hours. X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and Brunauer-Emmett-Teller (BET) analysis were conducted to evaluate phase composition, crystal size, and texture properties. The optimum condition was found at 900 °C for 10 h calcination, resulting in single-phase hydroxyapatite, a crystallite size of 220 nm, an average pore radius of 6.78 nm, a total pore volume of 0.02 cc/g, a surface area of 6.38 m2/g, and an average particle radius of 213.89 nm. These findings highlight the potential of this method for producing bioceramics with desirable properties for use in bone grafts and other biomedical materials.
Co-Authors Ade Wahyu Yusariarta Ade Wahyu Yusariarta Putra Parmita Ainun Zulfikar Andriansyah, Prisky Budi Prayitno Darma, Daffa Irsyad Dewi, Asti Lolita Dini Indrawati Fitriana Maharani Fatchur Rochim Idhil Ismail, Andi Jatmoko Awali Jatmoko Awali Kartika, Siska Ayu Laksono, Andromeda Dwi Mahera, Adinda Kholif Meutya Dwi Leoriza Mohd, Yusairie Muhammad Nurhidayatur Rozikin Muhammad Rifani, Muhammad Musyarofah Musyarofah, Musyarofah Nabilla Amalia Putri Nafisah, Azmia Rizka Norhidayah, Siti Oliever Andrea Parusha Putra, Ade Wahyu Yusariarta Riyadi, Ilham Tri Sabrina Humaira Tanjung, Rifqi Aulia Vadila, Mei Lisa Nur Winardi Dian Wahyu Pratama Yanti, Lisda Yunita Triana Yunita Triana, Yunita