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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).

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Articles 10 Documents

Search results for , issue "Vol 2, No 2 (2016): Widyariset" : 10 Documents clear

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

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.

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

WATER MASS DYNAMICS IN AMBON BAY Frilla Renty Tama Saputra; Yohanis Dominggus Lekalette
Widyariset Vol 2, No 2 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

Ambon Bay has a unique characterictic with its semi enclosed water inner bay. The aim of this research is to study the dynamics of water mass in Ambon Bay through the observation of vertical and horizontal distribution of temperature and salinity. The observation was conducted in 18 different stations throughout 2015 during Northwest Monsoon (February), Transition I (April), Southeast Monsoon (August), and Transition II (November). The result shows that the dynamics of water masses in Ambon Bay is strongly influenced by the monsoon. During the Northwest Monsoon, the temperature is higher than the other season and mixing phenomenon occurs, which is caused by heat diffusion from the surface. In the Transition I, water column stratification tends to occur caused by its mixing with fresh water. In Southeast Monsoon, the temperature in Ambon Bay is lower than the other season and flushing phenomenon occurs in Inner Ambon Bay which is caused by high density water mass flow from Banda Sea to Inner Ambon Bay. Entering the Transition II, the temperature are getting warmer again and forming a stratification which is caused by heat diffusion from the surface. The salinity profile in Ambon Bay shows the similar characteristic with temperature in every season. The salinity in Inner Bay is lower than the Outer Bay due to its mixing with fresh water.

DIVERSITY OF ENDOPHYTIC BACTERIA ASSOCIATED WITH (Curcuma heyneana) AND THEIR POTENCY FOR NITROGEN FIXATION Tri Ratna Sulistiyani; Puspita Lisdiyanti
Widyariset Vol 2, No 2 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

Endophytic bacteria shows a high biodiversity and some of the species plays important biological roles in agriculture. The aim of this study was to investigate the endophytic bacteria diversity associated with temu giring (Curcuma heyneana) and to evaluate its nitrogen-fixation activity. Temu giring was collected from Bogor Botanic Garden. The isolation of endophytic bacteria was carried out using two methods (spread plate and plant piece methods) and four different medias (Nutrient Agar (NA), NA contained temu giring extract (NAH), Water Yeast Extract Agar (WYEA), and WYEA contained temu giring extract (WYEAH)). The identification of selected isolates were conducted based on 16S rDNA. The ability of selected isolates to fix the nitrogen on Jensen’s media is then being tested. The results revealed that the suitable method and media of endophytic bacteria isolation were spread plate method and NA. Based on the morphological characteristics differentiation, 30 isolates were obtained from rhizome (27%), stem (50%), and leaves (23%). The sequencing result of 16S rDNA showed that community of endophytic bacteria was divided into six clusters, those are Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Flavobacteriia, Actinobacteria, and Firmicutes,which represented 17 genus consisted of Microbacterium, Leclercia, Brevundimonas, Chromobacterium, Enterobacter, Acinetobacter, Novosphingobium, Chryseobacterium, Curtobacterium, Agrobacterium, Sphingomonas, Herbaspirillium, Bacillus, Variovorax, Mycobacterium, Starkeya, and Rhizobium. A total of eleven isolates could grow in the N free medium. The presence of endophytic bacteria those were able to fix nitrogen are expected to be applied in agricultural sector as a biological fertilizer.

TRANSPLANTATION OF GIANT GOURAMY (Osphronemus gouramy) TESTICULAR CELLS IN EARLY HATCHING TILAPIA (Oreochromis niloticus) LARVAE Jasmadi Jasmadi; Odang Carman; Alimuddin Alimuddin
Widyariset Vol 2, No 2 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

Cell transplantation technology has been widely developed in mammals, but less implemented in inland aquaculture fish. Giant gouramy (Osphronemus gouramy) is one of important comercial aquaculture commodities that has a relatively long first reproductive cycle compared to the tilapia (Oreochromis niloticus). Tilapia has a faster reproductive cycle and potential as giant gouramy surrogate broodstock. This study was aimed to applicate testicular cell transplantation technology of giant gouramy in tilapia larvae and to evaluate its success rate trough donor cell colonization. Tilapia larvae of 1-2 dph (days post hatching) and 3-4 dph were injected with ±20.000 giant gouramy testicular cells in the peritoneal cavity, and then groomed for two months. Cell colonization of spermatogonium donor was determined by Polymerase Chain Reaction (PCR), using giant gouramy F1-Growth Hormone and R1-Growth Hormone primers. The result of cell dissociation showed that a bigger giant gouramy (827 g) had lower of spermatogonia composition (4.45%) than a smaller gouramy (608 g) (14.96%). Donor cell colonization in 1-2 dph recipient was higher (100%) than in 3-4 dph recipient (75%). Whereas recipient Survival Rate (SR) was 89.34% for 1-2 dph recipient and 98.96% for 3-4 dph recipient respectively. This study suggests that testicular cell transplantation technology of giant gouramy could be appllied to tilapia (Xenotransplantation) and cell transplantation has a better performance in 1-2 dph than in 3-4 dph recipients. With such success, there is a high potential that the giant gouramy cultivation can be increased through the cell transplantation technology.

THE INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURE AND MECHANICAL STRENGTH OF LATERITIC NICKEL STEEL Satrio Herbirowo; Bintang Adjiantoro
Widyariset Vol 2, No 2 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

Indonesia has abundant resources of lateritic nickel ore and coal. However, this resource has not been considered as a main raw material in the Indonesian steel industry. Therefore, this study are aimed to investigate several aspects of lateritic nickel intrinsic propertiesand its potency through heat treatment process. Nickel laterite steels are usually used for bridge and building construction steel. Their properties can be improved in various ways, such as by conducting temper heat treatment. This research reported the influences of heat treatment on microstructure and mechanical strength in nickel laterite steel. Samples were austenitized at 900ºC and subsquently tempered at 100 ºC, 200 ºC, 300 ºC, 400 ºC, 500 ºC, and 600ºC. Metallographic observation was conducted by using an optical microscope meanwhile mechanical strength were conducted by tensile test and surface hardness. The results showed evolution of mictrostructure in nickel laterite steel after heat treatment. The microstructure formed consisted of martensite temper. The presence of inclusion can affect brittle behavior of the lateritic nickel. The optimum tempering temperature was 200 ºC. The result of Scanning Electron Microscope (SEM) fractography showed the dimple and intergranular fracture has caused a more ductile and mechanical behavior which is compatible with construction steels standard.

ADAPTATION TEST OF FIVE NEW HYBRID MULBERRY TO IMPROVE NATURAL SILK PRODUCTIVITY Lincah Andadari; Rosita Dewi; Sugeng Pudjiono
Widyariset Vol 2, No 2 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

One of the problems faced by silk production in Indonesia is low productivity of mulberry that is currently planted by the farmers. Therefore, it is necessary to develop new hybrid of mulberries that have a higher leaves production. Before the new hybrid of mulberry can be cultivated by farmers, the new hybrid plant should be tested first. Adaptation test is required to view genetic response of the plant with the environment in which mulberry grows. The purpose of this study is conducting adaptation test of mulberry’s five types new hybrid to measure the growth and the productivity of plants. Adaptation test research of mulberry’s five new hybrids has been conducted from 2012 until 2014 in Cipeuteuy Village, Sub District Kabandungan, District of Sukabumi. This research used randomized block design method with six treatments and three replications. The results showed that two types of hybrid mulberry showed high percentage growth on average 99%. The use of hybrid mulberry Morus cathayana x Morus amakusaguwa IV.12 in natural silk production can increase 59,60 % of productivity, while Morus cathayana x Morus amakusaguwa IV.10 can increase 47,83% of productivity. Two types of hybrid mulberry, Morus cathayana x Morus amakusaguwa IV.12 and Morus cathayana x Morus amakusaguwa IV.10 have excellent potential in silkworm feed productivity development.

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.

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.

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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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Editorial Address 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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Contact Name
-

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-

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

Editorial Address
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

Location
Kota adm. jakarta selatan,

Dki jakarta

INDONESIA