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All Journal Jurnal Sains Materi Indonesia Seminar Nasional Teknik Kimia Kejuangan Journal of Engineering and Technological Sciences Journal of Renewable Energy and Mechanics
Jarot Raharjo
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Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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PERANCANGAN MESIN PENGHANCUR DAUN KERING MENGGUNAKAN LIMA MATA PISAU Arya Sutrisna; Syawaldi Kamaharudin; Dedikarni Panuh; Jarot Raharjo
Journal of Renewable Energy and Mechanics Vol. 2 No. 02 (2019): REM
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (454.15 KB) | DOI: 10.25299/rem.2019.vol2.no02.3532

Abstract

ABSTRAK Sebagai penelitian Tugas akhir dengan judul”Perancangan Mesin Penghancur Daun Kering Menggunakan Lima Mata Pisau”. Perancangan mesin ini bertujuan untuk mendapatkan suatu mesin penghancur daun-daunan kering. Untuk mendapatkan ukuran kehalusan daun dari proses pengolahan mesin penghancur daun-daunan kering. Untuk mendapatkan kapasitas produksi olahan dari mesin. Proses perancangan mesin penghancur daun kering dilakukan dengan tahapan yaitu perancangan dan penjelasan tugas/fungsi, perancangan konsep produk (gambar kerja). Analisis teknik meliputi analisis daya dan kecepatan yang terjadi pada poros. Tenaga penggerak mesin penghancur dedaunan kering direncanakan menggunakan motor listrik yang disesuaikan dengan kemampuan daya listrik untuk UKM yang diperkirakan rata-rata berkisar 900 sampai 1300 watt. Hasil dari perancangan mesin perancangan daun kering dengan kapasitas produksi 32 kg/jam, dan dimensi mesin panjang 60 cm x lebar 60 cm x tinggi 100 cm, mengunakan tenaga pengerak berupa motor listrik 1/2 HP 1400 rpm, rangka mengunakan siku profil L 40 x 40 x 4 mm. Hasil uji kinerja memperlihatkan bahwa mesin bekerja cukup baik, dan dapat menghasilkan kehalusan cacahan dedauan berukuran 5-10 mm. Kata kunci : Mesin penghancur daun, Daya, Putaran, Kapasitas Produksi ABSTRACT As a final project research with the title "Designing Dry Leaves Crushing Machine Using Five Blades". The design of this machine aims to obtain a dry leaf shredder. To get the size of the fineness of the leaves from the processing of the dried leaf crusher. To get the processed production capacity from the machine. The process of designing dry leaf shredder is done by stages, namely design and explanation of tasks / functions, design of product concepts (working drawings). Technical analysis includes analysis of power and speed that occurs on the shaft. The driving force of the dry foliage crusher is planned to use an electric motor that is adjusted to the ability of electric power for SMEs which is estimated to average around 900 to 1300 watts. The results of the design of dry leaf design machines with a production capacity of 32 kg / hour, and dimensions of the length of the machine 60 cm x width 60 cm x height 100 cm, using power in the form of 1/2 HP 1400 rpm electric motor, frame using L 40 x elbow profile 40 x 4 mm. The performance test results show that the machine works quite well, and can produce fineness of leaves measuring 5-10 mm. Keywords: leaf shredder, shaft power, speed, production capacity
FACILE ONE POT SYNTHESIS OF HIGHLY MONODISPERSE SILICA NANOPARTICLES IN WATER BASED MEDIUM Oka Pradipta Arjasa; Jarot Raharjo
Jurnal Sains Materi Indonesia Vol 14, No 1: OKTOBER 2012
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (281.58 KB) | DOI: 10.17146/jsmi.2012.14.1.4638

Abstract

FACILE ONE POT SYNTHESIS OF HIGHLY MONODISPERSE SILICA NANOPARTICLES IN WATER BASED MEDIUM. Highlymonodisperse silica nanoparticles (SNs) were successfully prepared using water based synthesis. The right catalyst and controllable release of silanol compounds into water phase was the two mostimportant parameters in the SNs water based synthesis. The particle size of the SNs produced by this method was easily controlled by changing TetraEthyl OrthoSilicate (TEOS) concentration. The particle size ranging from 60 nm to 200 nm can be prepared in one pot synthesis. The SNs were analyzed by using dynamic light scattering.
Studi Pengaruh Co-doping Neodymium (Nd) Terhadap Sifat Fisik Elektrolit Ce0.9Gd1-xNdxO2-z dengan Metode Sol-Gel untuk Aplikasi IT-SOFC Jarot Raharjo; masumi .; Wahyudin .
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Neodymium and Gadolinium co-doped ceria (Ce0.9Gd1-xNdxO2-z) is a promising alternative as a solidelectrolyte for intermediate temperature solid oxide fuel cell (IT-SOFC) due to its low operating temperatureand its high electrical conductivity. Ce0.9Gd1-xNdxO2-z powders, with x=0.25, 0.50 and 0.75mol% ofneodymium were successfully syhnthesized with a sol-gel method and citric acid as an organic precursor.The samples were calcined at temperature of 750oC for 5 hours. The powders properties were thencharacterized by X-ray diffraction, scanning electron microscopy, thermal gravimetry analysis, and thesintered pellets were evaluated by Archimedes method for calculate the density. Sintered Ce0.9Gd1-xNdxO2-zsamples exhibited the maximum theorical density of 97% which is suitable for solid electrolytes. TheCe0.9Gd1-xNdxO2-z powders consist of face-centered cubic fluorite ceria structure confirmed with x-raydiffraction (XRD). methodology investigated showed a better control of stoichiometry, impurities, and lowcost.
Pengaruh Temperatur Anil terhadap Sifat Elektrokimia Lantanum Pentanikel (LaNi5) dengan Penambahan Serium Oksida (CeO2) Ade Utami Hapsari; Jarot Raharjo; Yelvia Deni
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Annealing is one of the processes to increase capacity, discharge rate, and cycle life for anode AB5 type alloymaterial. Increasing the annealing temperature will increase capacity and homogenize material. This makesthe material more corrosion resistant and resistant to degradation during the process of absorption ordesorption of hydrogen atoms in the electrolyte solution. The study was conducted to see the characterizationof powders anode materials LaNi5 after the addition of 1% CeO2 and annealed at 300, 600, and 900°C for 6hours in an argon gas environment. The powders were characterized using XRD and SEM-EDX.Electrochemical testing is measured by using Electrochemical Impedance Spectroscopy (EIS) at a frequencyof 5 mHz - 100 kHz. Increasing anneal temperature changes the diffraction phase, decreasing conductivityand increasing the resistance value. Semicircle pattern of LaNi5 anode material with the addition of 1%CeO2 conducted annealing process shows the semicircle pattern with a radius of the arc increases. Thisindicates the magnitude of the resistance barrier material.
Effect of Dissolution Temperature on Purity of LaNi5 Powder Synthesized with the Combustion-Reduction Method Ade Utami Hapsari; Retna Deca Pravitasari; Hanif Yuliani; Damisih Damisih; Deni Shidqi Khaerudini; Aghni Ulma Saudi; Jarot Raharjo
Journal of Engineering and Technological Sciences Vol. 53 No. 5 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.5.12

Abstract

The LaNi5 intermetallic phase has been extensively investigated because of its excellent properties, such as attractive hydrogen storage, medium plateau pressure, and easy activation. LaNi5 phase is generally produced by a complicated method, which involves several steps, i.e. melting, alloying, casting, softening and making them into powder. This study aimed to develop a new LaNi5 synthesis process by modifying the combustion-reduction method. In this method it is very important to produce La2NiO4, because LaNi5 is formed from the process of reducing this phase. The precursor powders La(NO3)3.6H2O and Ni(NO3)2.6H2O were reacted with distilled water as a solvent medium and mixed using magnetic stirring. The synthesis process was carried out at room temperature, 60 °C, 70 °C, and 80 °C for 10 minutes until the solution became transparent green. The solution was then dried for 2 hours at 100 °C to form a transparent green gel. The gel was calcined at a temperature of 500 °C for 2 hours, producing a black powder. The optimal black powder was then reduced using CO gas at 600 °C for 2 hours. The powder samples were characterized using XRD, FTIR, and SEM-EDX. The analysis revealed that synthesis at room temperature was the most optimal method for the reduction process because it produced the most La2NiO4, at 12.135 wt%.
Studi Pengaruh Presipitan Basa Terhadap Sifat Fisik Nanomaterial Cerium Dioksida (CeO2) dengan Metode Presipitasi Jarot Raharjo; Hanif Yuliani; Ade Utami Hapsari; Damisih Damisih; Putri Widya Pangestika; Defi Rahma Santi
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2018: PROSIDING SNTKK 2018
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Co-Authors Ade Utami Hapsari Ade Utami Hapsari Ade Utami Hapsari Aghni Ulma Saudi Arya Sutrisna Damisih Damisih Damisih Damisih Dedikarni Defi Rahma Santi Deni Shidqi Khaerudini Hanif Yuliani Hanif Yuliani masumi . Oka Pradipta Arjasa Putri Widya Pangestika Retna Deca Pravitasari Syawaldi Kamaharudin Wahyudin . Yelvia Deni