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Widyariset

widyariset
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Published by Lembaga Ilmu Pengetahuan Indonesia

ISSN : 14117932 EISSN : 24610976 DOI : -

Core Subject : Engineering,

Engineering

Widyariset is a scientific journal which publishes the results of research and development, assessment and systematic thinking about science and technology. The writers of the scientific papers in this journal come from researchers/researcher candidates from various institutions' research and development (R&D), and universities. Widyariset is published regularly three times a year: in April for the issue of Social Sciences and Humanities (IPSK), in August for the issue of Natural Sciences (IPA) and in December for the issue of Engineering Sciences (IPT).

Arjuna Subject : -

Articles 485 Documents

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UTILIZATION OF NATURAL IRON ORE FOR CATALYTIC REACTION OF (Pyroligneous acid) DERIVED FROM PALM KERNEL SHELLS Muhammad Arifuddin Fitriady; Dieni Mansur; Sabar Pangihutan Simanungkalit
Widyariset Vol 2, No 2 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

The increasing of energy demand and environment awareness along with the depletion of fossil fuel imply that the future energy supply must be from the renewable energy source. One of the major renewable energy sources is biomass. Pyrolysis is a rapid decomposition of organic materials in the absence of oxygen resulting in pyrolysis oil, gas, and charcoal products. High water contents and instabilities such as viscosity increase and phase separation are the main problems of pyrolysis oil as a source of useful chemicals. The pyrolysis oil is separated into the oil phase and the pyroligneous acid. The pyroligneous acid contains a lot of chemical substances, that prohibit removal to the environment as a waste due to environmental pollution. Furthermore, pyroligneous acid needs to be treated to obtain the useful chemical. In this study, catalytic reaction of the pyroligneous acid, derived from pyrolysis process of palm kernel shells, was carried out over natural iron ores catalyst at 350 °C with W/F [W: the amount of catalyst bed (g) and F: the flow rate of feed (g h-1)] of 0.5 h. The analysis result showed that iron ores that treated by calcination at 285 °C had a higher ability for ketonization reaction of carboxylic acid compared to other catalysts. Even so, neither calcination up to 500 °C nor steam treatment of natural iron ores can significantly increase the activity of the catalyst for the ketonization reaction even though the BET surface area of the catalyst increased.

INFLUENCE OF CARBON AND NITROGEN ADDITION ON THE CORROSION RESISTANCE OF Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni ALLOYS Fendy Rokhmanto; Cahya Sutowo; Ika Kartika
Widyariset Vol 4, No 1 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Cobalt alloys is one of the implant materials that is used in orthopedic and dentistry, because of its biocompatibility, good mechanical properties, and high corrosion resistance. The mechanical properties and corrosion resistance can be enhanced by thermomechanical treatment and addition of alloying element. Carbon and nitrogen were added to enhance mechanical properties and high corrosion resistance. Effect of carbon variation and nitrogen to the corrosion resistance in Co-Cr-Mo (CCM) alloys were measured by corrosion measurement system (CMS) device in Hank’s Solutions after thermomechanical treatment process. Corrosion rate of Co-Cr-Mo alloys with carbon variation dropped to 5.8 x 10-4 mmpy and 5.2 x 10-4 mmpy with carbon variation and nitrogen. Decreasing corrosion rate indicated that the corrosion resistance of alloys is increased with the addition of carbon and nitrogen.

ANALYSIS OF THERMAL AND AERODYNAMICS PERFORMANCE OF BATAK TOBA TRADITIONAL HOUSE BY IMPLEMENTING DIGITAL SIMULATION AND FIELD MEASUREMENT Yuri Hermawan Prasetyo
Widyariset Vol 2, No 2 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

Traditional house is believed to have a better thermal performance compared to the modern house. Utilization of passive design in buildings can refer to the passive system used in a traditional house through natural ventilation and local materials application. Digital simulation was used to evaluate the thermal performance of the Batak Toba Traditional House by comparing field measurement data; and as a validation tool. This study aims to determine the thermal and aerodynamic performance of Batak Toba Traditional House by using digital simulation and field measurements. The used method was by comparing the results of digital simulation analysis with indoor and outdoor direct temperature measurements of the Batak Toba Traditional House. The softwares used for simulation were Meteonorm, Ecotect and CFD-ACE+. The measurements were conducted for 24 hours in May 4th-5th and April 26th-27th 2013 within one hour time interval. The results of the analysis of digital simulation show the same phenomenon compared with the result of field measurement that is 80% in range thermal comfort within one year. Field measurement results showed that the thermal conditions resulted from all day field measurement was under the upper limit temperature reference of thermal comfort with natural ventilation, that is 29 °C.

CORAL REEFS Terry Indrabudi; Robert Alik
Widyariset Vol 3, No 1 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

Coastal development in Ambon Bay led to increased sedimentation and pollutant into the waters. It effects on organism in Ambon Bay, including coral reefs. This study aims to look the condition of coral reef. The study method is Line Intercept Transect (LIT) in eight observasion stations, two stations in the inner bay and six stations in the outside bay. The results showed there has been a decline in coral cover in the area that has development activities and high antropogenic activity like Hative Besar, Poka, Kota Jawa, Halong, and Hunuth station. As for areas that have lesser development activity and antropogenic activity, the condition of coral cover increased as happened at Lilibooy, Eri, and Batu Capeu stations. Stations that have coral reefs “very good category” is at St. Eri station, “good category” is at St. Lilibooy station, “medium category” is at St. Kota Jawa station and St. Batu Capeu while “bad category” are at St. Hative Besar, St. Poka, St. Halong and St. Hunuth stations. Coral growth at each station is dominated by a non-acropora group. The life forms are massive corals and submassive corals from Porites, Favites, Platygyra, Millepora, Symphyllia, Lobophyllia, Styphora and Pavona genus.

AC POWER CALIBRATION ON POWER QUALITY ANALYZER USING A MULTIPRODUCT CALIBRATOR Hayati Amalia; Agah Faisal
Widyariset Vol 3, No 1 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

AC power calibration on power quality analyzer by using indirect method has been developed in Research Center for Metrology, Indonesian Institute of Science (LIPI). The measurement was performed by applying input voltage and input current from a standard multiproduct calibrator. Before being transferred to a power quality analyzer, the input current is passed first to the current coil to adapt the measuring range of the coil clamp of the power quality analyzer. Data collection and evaluation to determine the correction and uncertainty were carried out separately and alternately per phase. The analysis to evaluate the measurement correction and uncertainty was developed by considering the parameters that form the AC power, such as voltage, current, and phase angle. Based on the result of the calibration data analysis, it was obtained 5% of correction by the greatest measurement uncertainty of 1.92% at confidence level of 95% and coverage factor k=2.

GROWTH VARIATION OF SEVERAL POPULATION SOURCES OF Alstonia scholaris (L.) R. Br AT THREE YEARS OLD IN GUNUNG KIDUL Mashudi Mashudi
Widyariset Vol 3, No 2 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

Alstonia scholaris (L.) R. Br is a local species with a broad distribution and has a fairly high economic value. This study was aimed to determine the growth variation of Alstonia scholaris (L.) R. Br from several population sources at three years old in Gunung Kidul, Yogyakarta. The experimental design used was randomized complete block design (RCBD) with two factors, namely the population sources (Lombok, Jayapura, Solok, Timor, and Bali) and parent trees (48 parent trees). In this study parent trees nested in the population sources. Each parent trees planted four trees per plot, four replicates (blocks) with a spacing of 4 x 2 m. Results of variance analysis showed that the population sources significantly influenced by survival rates, the height of growth and stem diameter, and then parent trees affected considerably to the height of growth and stem diameter. The best survival rates were occupied by the Lombok population (93.32%), Bali population (91.96%), and Timor population (89.06%). The best height of growth was occupied by Lombok population (3.04 m) and Bali population (2.88 m), and for stem diameter was Lombok population (5.92 cm). There were seven best parent trees in the height of growth in a range between 3.25 to 3.72 m and 19 best parent trees in the growth of stem diameter ranging from 5.82 to 7.28 cm.

PERILAKU SENSITASI PADA LOGAM STAINLESS STEEL SERI J4 AKIBAT PERLAKUAN PANAS Gadang Priyotomo; I Nyoman Gede Putrayasa A
Widyariset Vol 4, No 2 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

The failure of austenitic stainless steel during the industrial aplications is place sensitization due to heat treatment. The investigation of that failure has been investigated by researchers in particular for stainless steel 2XX and 3XX types, while there isno or little investigation for stainless steel J4 type.Furthermore, the investigation of the presence of sensitization on stainlees steel was conducted by referring to American Society for Testing and Materials (ASTM) A262-02a, which the caracterization of metal surface morphologies dan chrom content used optical microscope andscanning electron microskop, and Energy-dispersive X-ray spectroscopy, respectively. The results elucidate that sensitization is produced in temperature range from700oC up to 900oC .There isgrain boundaries attack onsurface morphologies after sensitization test in the temperature range from700oC up to 900oC ,whichis unlikely to happenat temperature of 600oC. The possibility of chromium difusion to grain boundaries took place from the decrease of chromium content adjancent with grain boundaries and the increase of chromium content in grain boundaries, whichimplies the formation of intermetallic compound of carbide.

ABSTRAK INDONESIA admin jurnal
Widyariset Vol 4, No 2 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

SOLVENT EXTRACTION PROCESS FOR THE RECOVERY COBALT AND NICKEL FROM LOW-GRADE LATERITE USING BATCH RECYCLE SYSTEM Sudibyo Sudibyo; Agus Junaedi; Muhammad Amin; Slamet Sumardi; Fajar Nurjaman; Bramantyo Bayu Aji; Yayat Iman Supriyatna; Lilis Hermida
Widyariset Vol 4, No 2 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Low-grade laterite which contains nickel lower than 0.5 % is difficult to beprocessed using pyrometallurgy. One method which isable to solve this problem is solvent extraction. In thisstudy, a solvent extraction process using batch recycle methods has been successfully applied to separate nickel and cobalt from low-grade laterite. Sulphuric acid was used to leach laterite at atmospheric pressure. Meanwhile, cyanex in toluene was used as an organic solvent. Taguchi experimental design has been used to analyze and optimize the solvent extraction process using batch recycle methods. Taguchi analysis results show that the optimum conditions are at 7 of pH, 3 hours of time operation, 0.9 liter/minute of flow rate and 0.75 of organic/aqueous solutions ratio.

PERFORMANCE ANALYSIS OF PSO-PD CONTROLLER IN CONTROLING THE RIGID GANTRY CRANE SYSTEM Rifa Rahmayanti; Qidun Maulana Binu Soesanto; Edwar Yazid
Widyariset Vol 4, No 2 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Karya tulis ini membahas tentang algoritma particle swarm optimization (PSO) untuk mengoptimalkan penguat pengendali PD yang dinamakan pengendali PSO-PD. Efektivitas algoritma pengendali yang diusulkan diuji dengan menggunakan fungsi step dan dibandingkan dengan pengendali PD berbasis Zigler-Nichols (ZN-PD). Hasil simulasi yang didapatkan menunjukkan bahwa pengendali PSO-PD menghasilkan waktu naik dan waktu puncak yang lebih lambat dibandingkan dengan pengendali ZN-PD, tetapi memiliki waktu tunak yang lebih cepat dan nilai overshoot yang kecil di bawah trayektori yang didefinisikan.Kata kunci: Sistem gantry crane, PSO, Gain PD, Sudut ayunan AbstractThis paper presents the particle swarm optimization (PSO) algorithm to optimize the gains of the PD controller to form what so-called the particle swarm optimization (PSO-PD) controller. The effectiveness of the proposed control algorithm is tested under constant step function and compared with Ziegler-Nichols (ZN-PD) controller. Simulation results show that proposed controller has slower rise time and peak time than ZN-PD controller as well as small overshoot under the predefined trajectories.

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Pusbindiklat Peneliti-LIPI (The National Training and Education Center for Researchers Development – Indonesian Institutes of Sciences) Jl. Raya Bogor Km. 46, Cibinong Science Center Cibinong - Bogor 16911

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Kota adm. jakarta selatan,

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