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Published by Pusbindiklat Peneliti LIPI

ISSN : - EISSN : 24610976 DOI : 10.14203

Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics

Widyariset is a scientific journal which publishes the results of research and development, assessment, and systematic thinking about Natural Science.

Arjuna Subject : Umum - Umum

Articles 10 Documents

Search results for , issue "Vol 3, No 1 (2017): Widyariset" : 10 Documents clear

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.

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.

SINGLE MASTER – MULTIPLE SLAVES MICROCONTROLLER IMPLEMENTATION FOR SENDING AND RECEIVING DATA ON WEATHER STATION PROTOTYPE Dikdik Krisnandi; Purnomo Husnul Khotimah
Widyariset Vol 3, No 1 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

We have carried out the microcontroller research implementation as a Master to control multiple Slaves microcontroller on weather station prototype. Master Microcontroller could be interconnected with four Slaves microcontrollers Slaves, in which each has a different type of input. In this research, we used an ATmega8535 microcontroller. To distinguish between a Slave microcontroller and another Slave microcontroller, an addressing system (ID) is used. Data communication used a standard serial port RS-232 and RS-485 ports, the connector is used to connect the two ports. The Single Board Controller (SBC) Master serves user commands from users, sending the commands and processing Slaves. User commands are given via the keypad and then transmitted using a Universal Asynchronous Receiver-Transmitter (USART) to SBC Slaves. The process on the SBC Slaves is waiting for orders from the Master. The order is detected using an interrupt. After that, the commands are processed and the respond is sent to the SBC Master via USART. When there is no command, Slaves do the idle process. The result shows that the microcontroller application single Master - multiple Slaves has functioned for sending and receiving data in accordance with the specified command. This is shown by the output on a display that has shown the result as expected. The power consumption of each SBC is relatively small which is 0,745 Watt. Thus, it makes the system more economically profitable.

Kumpulan Abstrak Inggris Inggris Inggris
Widyariset Vol 3, No 1 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

THERMOMECHANICAL TREATMENT PROCESS OF α/βTi-6Al-6Mo ALLOY AS NEW ALTERNATIVE MATERIALS FOR BIOMEDICAL APPLICATION Cahya Sutowo; Fendy Rokhmanto; Galih Senopati
Widyariset Vol 3, No 1 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

Telah dilakukan proses pengecoran paduan Ti-6Al-6Mo menggunakan arc remelting furnace dan dilanjutkan dengan proses perlakuan termomekanik berupa homogenisasi dan pengerolan panas pada temperatur 900, 1000, dan 1100 °C. Pelat Ti-6Al-6Mo hasil pengerolan panas dikarakterisasi menggunakan mikroskop optik dan mikroskop elektron untuk mengidentifikasi struktur yang terbentuk, analisa pola difraksi sinar-x dilakukan untuk mengidentifikasi fasa yang terbentuk, dan uji keras dengan metode rockwell dilakukan untuk mengetahui harga kekerasan pelat Ti-6Al-6Mo. Struktur mikro hasil pengerolan berupa struktur titanium α dan tititanium β terdeformasi. Fasa titanium α dan titanium β juga teridentifikasi pada grafik pola difraksi sinar-x. Hasil pengujian kekerasan menunjukkan kekerasan tertinggi dicapai pada pengerolan pada temperatur 1100 °C.

THE EFFECT OF INDUCTOR RESISTANCE ON DEFIBRILLATION ENERGY FROM ELECTROCARDIOGRAPH ENDURANCE TEST SYSTEM Irawan Sukma; Siddiq Wahyu Hidayat; Wuwus Ardiatna
Widyariset Vol 3, No 1 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

Electrocardiograph endurance test system has two work processes like defibrillator. Charging process produces energy stored in capacitor (ES) and discharges process produce defibrillation energy. Defibrillation energy without connect to electrocardiograph (E2) at test system is influenced by the resistance values of inductor (RL). In previous research, test system only produces E2 = 19,83 joule, this is caused by the inductor used with value RL = 72 Ω. The purpose of this research is to select inductor resistance value to get good and efficient value E2. Range value RLused in test system was 1–10 Ω, based on standar International Electrotechnical Commission (IEC) 60601-2-27 clause 201.8.5.5.2. Voltage measured in point 100 Ω every time interval (∆t) 0,02 ms obtained from multisim software simulation. The result of simulation indicated if peak voltage increased, then value RL was used approach zero. In other side, measured Voltage data was used as parameter to calculate total E2in every range of RLvalue, then result E2total was compared to ES value to get energy ratio value. Value RL= 1 Ω was the most efficient because has ratio energy value 98,45% with E2 = 393,80 joule, while energy ratio when RL= 10 Ω was not efficient because only had energy ratio value 89,58% with E2 = 358,33 joule.

FORMULATION OF CHITOSAN MEMBRANE COMPOSITION AND STIRRING OPTIMIZATION FOR REDUCING TOTAL SOLID OF PALM OIL MILL EFFLUENT Sri Wahyuni; Siswanto Siswanto; Soekarno Miswana Putra
Widyariset Vol 3, No 1 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

Palm oil mill effluent (POME) is palm oil industry wastewater with high solid content. Waste filtration using chitosan membrane has been investigated to decrease the solid waste, but the final value does not meet the quality standards. Therefore, further development on formulation and optimization of the membrane manufacturing process (composition and stirring speed) are needed. The purpose of this study was to determine the effect of composition and stiring speed on the performance of the membrane in decreasing solid content of POME. Chitosan membrane was prepared by phase inversion method with two supporting materials, namely Poly Ethylene Glycol (PEG) and Poly Vinyl Alcohol (PVA). The variables of this experiment were Chitosan:PVA ratio (40:60, 45:55, 50:50, 55:45 and 60:40 (v/v)) and stiring speed (200 rpm and 250 rpm). Chitosan composite membrane was tested in a cross flow reactor system. The result showed that the highest rejection values of TSS and TDS generated by the membrane on the chitosan and PVA ratio of 50:50 (v: v) at agitation speed of 250 rpm were 96.84% and 97.23%, respectively.

Kumpulan Abstrak Indonesia Indonesia Indonesia
Widyariset Vol 3, No 1 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.3.1.2017.%p

REYNOLDS NUMBER ESTIMATION OF ROTAMETER BASED ON K-EPSILON MODEL Bahrudin Bahrudin; Hilman Syaeful Alam
Widyariset Vol 3, No 1 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.3.1.2017.9-18

Measurement of fluid flow with the aid of a floating element (rotameter) is a simple method used to measure the velocity of the fluid with a better degree of accuracy. However, there is still a tendency for turbulence flow around the floating element (annular area) due to narrowing of the flow area and the geometry shape of the floating element that can reduce the level of the rotameter accuracy. Single phase turbulent flow through rotameter was estimated using k-epsilon turbulence model. Detailed study has been performed to investigate the influence of turbulence characteristics from the Reynolds Number ( ) as a benchmark for predicting the level of turbulence. The results showed that at the velocity of 800 l/h the level is arounds 450, which show that the fluid flow on the rotameter categorized as turbulence

CHARACTERISTICS OF ORGANIC AND NUTRIEN REMOVAL ON LOOP BIOFILTER SYSTEM FOR PEAT WATER AND WASTEWATER TREATMENT Elis Hastuti; Fitrijani Anggraini; Reni Nuraeni
Widyariset Vol 3, No 1 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.3.1.2017.55-66

Domestic wastewater pollution in the watershed area which has ecologically sensitive area, such as peat water, can be resolved by water management that combines raw water treatment and wastewater treatment with closed loop system on a community scale. This paper describes the removal characteristics of organic and nutrient in biofilters loop system to treat raw water that contains color <300 units PtCo, COD 102-116 mg/L, and domestic wastewater. Water treatment system which consists of a biological treatment and multimedia filtration is used to supply drinking water and to conduct wastewater treatment on a community scale by using the potential of ecosystems and chemical-physical characteristics of peat. The study was conducted by applying method of field scale to serve 50 families and method of performance evaluation models based on approach of first-order kinetics plug flow and Kadlec and Knight k-C* model. The case study is located in downstream of Siak watershed areas, as one of the national strategic watersheds, which is packed with urban slum areas with low access to surface water utilization and good sanitation infrastructure. Water treatment unit that consists of peat biofilter systems, hybrid aerobic biofilter, and zeolite cation-anion filtrationcan support water supply in public sanitation facilities. The biofilters loop model for wastewater treatment consists of hybrid Upflow Anaerobic Sludge Blanket (UASB), biofilters, and constructed wetlands which its media is a combination between porous media and peat soils. At steady state, the removal of organic and nitrogen is larger than 90%.

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Editorial Address Pusbindiklat LIPI, Jl. Raya Bogor Km. 46, Cibinong Science Center, Cibinong - Bogor 16911

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Contact Name
Andri Rahman

Contact Email
andri.agus.rahman@lipi.go.id

Phone
-

Journal Mail Official
widyariset@mail.lipi.go.id

Editorial Address
Pusbindiklat LIPI, Jl. Raya Bogor Km. 46, Cibinong Science Center, Cibinong - Bogor 16911

Location
Kab. bogor,

Jawa barat

INDONESIA