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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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PHOSPHATE AND NITRATE DISTRIBUTION IN INNER AMBON BAY DURING NORTHWEST AND SOUTHEAST MONSOON Idha Yulia Ikhsani; Malik Sudin Abdul; Johanis Dominggus Lekalette
Widyariset Vol 2, No 2 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

This study has compared the distribution of nutrients phosphate and nitrate concentrations in the inner Ambon Bay during two different seasons: Northwest and Southeast monsoon. The result showed that the nutrient concentrations in the Southeast monsoon were higher than those in the Northwest monsoon, both for phosphate and nitrate. The ranges of phosphate concentrations on the surface and near the bottom of the bay during the Northwest monsoon were 0.0471-0.0549 mg/L and 0.0549–0.1176 mg/L, while the ranges of nitrate concentrations were from undetected to 0.0976 mg/L on the surface, and 0.0956–0.5870 mg/L near the bottom of the bay. Meanwhile, the phosphate and nitrate concentration on the surface during the Southeast monsoon were 0.0495–0.0676 mg/L and 0.0247–0.4019 mg/L, while near the bottom the concentrations were 0.0495–0.1802 mg/L and 0.0247– 0.7944 mg/L. These results indicated that phosphate and nitrate concentrations in the inner Ambon Bay have exceeded the marine water standard quality, which can be categorized as polluted. High concentrations of phosphate and nitrate during Northwest monsoon could be caused by run-off from the mainland area that enters the bay trough the river. On the other hand, the enrichment of nutrients in the inner Ambon Bay during the Southeast monsoon could be dominated by the “nutrient-rich water mass” from Banda Sea that enters the inner Ambon Bay.

CORROTION RATE AND MORPHOLOGY OF POROUS METAL ALLOY Mg-Ca-Zn WITH CaCO3 AS FOAMING AGENT Aprilia Erryani; Franciska Pramuji Lestari; Dhyah Annur; Muhammad Ikhlasul Amal; Ika Kartika
Widyariset Vol 4, No 1 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Magnesium alloy is a material that has been developed as a biodegradable implant material in orthopedic applications. Magnesium alloys have good biocompatibility, biodegradability, and good mechanical properties which make them have the potential to be used as a biomedical material. The main objective of this paper is to investigate corrotion rate and morphology after corrotion of biocompatibility of implant-based alloys Mg-Ca-Zn with CaCO3 as a foaming agent. Mg-Ca-Zn Alloy was made by the method of powder metallurgy with the addition of CaCO3 as a foaming agent with three variations of composition (96Mg-Ca-3Zn-CaCO3, 91Mg-Ca-3Zn-5 CaCO3, and 86Mg-Ca-3Zn-10 CaCO3 wt%). Sintering process was carried out at 600 °C and 650 °C with a holding time of five hours. Corrosion test was performed using G750 Gamry Instrument in accordance with ASTM standard G5-94. Simulated body fluid electrolyte used is Hank's solution with a pH value of 7.4 and a temperature of 37 °C. Then the analysis of the microstructure after corrosion test was conducted using scanning electron microscopy (JEOL, JSM-6390A Japan) equipped with energy dispersive spectrometry data (EDS). Alloy corrosion rate of Mg-Ca-Zn-CaCO3 increases with the amount of CaCO3 in the alloy and the temperature rise in the sintering. From the test results, the smallest corrosion rate is in the alloy 91Mg-Ca-3Zn-CaCO3 at 600 °C sintering (58.3045 mpy) and the highest occurs in alloy 86Mg-Ca-3Zn-10CaCO3 at 650 °C sintering (91.4007 mpy). Surface morphology of the alloy after the corrosion process is the type of volcano. This localized corrosion occurs where an electrochemical reaction takes place to form a distinctive structure with a circle and a hole in the middle.

Kumpulan Abstrak Bahasa Indonesia Abstrak Indonesia
Widyariset Vol 2, No 1 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

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.

DIVERSITY, DISTRIBUTION, AND UTILIZATION OF ORCHIDS SPECIES (Orchidaceae) IN BODOGOL FOREST, GEDE PANGRANGO NATIONAL PARK, WEST JAVA Asep Sadili; Siti Sundari
Widyariset Vol 3, No 2 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

To investigate the diversity, distribution, and utilization of orchid, a study was conducted in Bodogol forest of Gede Pangrango National Park (TNGP). Around 82 species of 41 genera of orchids were identified in this area which consisted of 58 species of epiphytes orchids and 24 species of terrestrial orchids. The genera of Agrostophyllum, Dendrobium, and Eria were the most commonly found orchid in this area. Distribution of orchid species varied from India to Pacific islands, including Japan. Among recognized six endemic orchid species of Java island, two new records of orchids at GPNP were determined, i.e. Neuwiedia veratifolia and N. zollingeri var. javanica. In general, the orchids in Bodogol forest have not been economic commodities priority yet, but several species were potential to be developed for utilization.

THE INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURE AND CORROSION RESISTANCE OF 13Cr-1Mo MARTENSITIC STAINLESS STEEL Siska Prifiharni; Moch. Syaeful Anwar; Efendi Mabruri
Widyariset Vol 2, No 1 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

Martensitic stainless steels have been extensively used for a turbine blade. Their properties can be improved in various ways, such as by heat treatment. This paper aims to investigate the influence of heat treatment on microstructure and corrosion resistance in martensitic stainless steel 13Cr-1Mo. Samples were austenitized at 950 ºC, 1.000 ºC, 1.050 ºC, 1.100 ºC, and tempered at 600 ºC. Austenitized sample at 1.050 ºC was subsequently tempered at 300 ºC, 400 ºC, 500 ºC, 550 ºC, 600 ºC, 650 ºC, and 700 ºC. The tests consist of metallographic observation which was conducted by using an optical microscope and corrosion tests which were conducted by using 3,5% NaCl solution. The results show the evolution of microstructure in martensitic stainless steel 13Cr-1Mo after heat treatment. The microstructure formed consists of tempered martensite, delta ferrite, retained austenite, and carbides. The presence of carbides can also affect corrosion resistance, which will increase along with the increase of tempering temperature due to the increased content of Cr in the carbides. The highest value corrosion resistance was obtained at the austenitizing temperature of 1.050 ºC and tempering temperature of 600 ºC.

ABSTRAK INDONESIA admin admin
Widyariset Vol 4, No 1 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Kumpulan Abstrak Inggris Abstrak Inggris
Widyariset Vol 2, No 2 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

CATCH AND RELATIVE ABUNDANCE OF SOME SHARKS LANDING IN TANJUNG LUAR, LOMBOK Agus Arifin Sentosa; Dharmadi Dharmadi
Widyariset Vol 3, No 2 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

Tanjung Luar is the center of shark fisheries in Indonesia because it has more shark catches than any other fish landing places in Indonesia. The aims of this study were to present the catch characteristics and the relative abundance of some sharks landing in Tanjung Luar, Lombok. Data were obtained through the interview with enumerators and from their daily monitoring record on the shark landing at Tanjung Luar, East Lombok during eleven months period from January to November 2015. Data statistics were calculated descriptively and presented as a percentage of relative abundance. The result shows the shark caught in 2015 has fluctuated monthly with the peak of catch occurred on September 2015. Total shark caught were about 237.5 tonnes and average landing per day was 1.4 tonnes. Species composition of overall catch comprised of 28 species which belong to 11 families. Among those species, Silky shark/Carcharhinus falciformis (42.06%), Blue shark/Prionace glauca (10.45%) and Blacktip shark/Carcharhinus limbatus (10.31%) were predominant as indicated having relative abundance more than 10%.

MODELING OF SEPTIC TANKS SEEPAGE NEAR DUG WELLS IN MARGAHAYU VILLAGE, BANDUNG REGENCY Dedi Mulyadi; Rizka Maria; Khori Sugianti; Arifan Jaya Syahbana
Widyariset Vol 4, No 1 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Dense settlements have an impact on pollution, one of which is domestic pollution which results in groundwater and soil water pollution at ground level. Identification of pollution that occurs below the soil surface (groundwater contamination) is more difficult to detect, so modeling is needed to find out how the rate of groundwater pollution rate. Modeling is done by using water sampling method at dug well at location adjacent to septic tank. Sampling ground water and infiltration modeling is done by using Geostudio SEEP/W software. The research area is in Margahayu village, Bandung regency. The results of laboratory analysis and physical observation in the field show that the Margahayu region has ammonium (NH4-N) content which is above the standard quality threshold. This condition is reinforced by modeling simulation results that there has been domestic sewage from septic tanks to dug wells. Pollution has reached groundwater level with depth ranged between 4-5 meters. The distance of wells adjacent to the septic tanks affects the quality of groundwater. In the KB area 17 it is indicated that the contamination in the residents' wells in harike-3i, KB new on the 32-40 day time frame, and KB new 2 on the 24th day. Distance sources of contaminants and soil permeability play an important role in determining the travel time of contaminants.

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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,

Dki jakarta

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