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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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HUBUNGAN ANTARA KEMAMPUAN BERBICARA BAHASA INGGRIS DENGAN HASIL TOEFL PADA TARUNA SEKOLAH TINGGI ILMU PELAYARAN (STIP) JAKARTA Akhmad Kasan Gupron
Widyariset Vol 12, No 3 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

The purpose of this research was to describe the correlation between speaking ability and TOEFL (Test of English as a Foreign Language) score of cadets in Sekolah Tinggi Ilmu Pelayaran (STIP) Jakarta. The research was conducted in STIP because STIP has declared to produce internationally qualified seafarers. In line with its declaration, STIP always evaluates the cadets' English proficiency by Speaking test and TOEFL (Paper-Based TOEFL) every semester Population of this research was the first year cadets, batch 50. The respondents consisted of 20 cadets every major, so there were 60 cadets altogether. The instruments used in this research were interview form and TOEFL question set. This research showed that there was low positive correlation between speaking ability and TOEFL score. The correlation coefficient was 0.276. Therefore, it can be concluded that there are other factors influence TOEFL score. They are readiness, experience, and strategy.

The Activity of residents in Belida River, are affecting water quality conditions, and the presence of organisms in it. One of the biota that has an important role in these waters is periphyton. The study aims to determine the abundance and diversity of periphyton in Belida river waters around District Muara Enim. A descriptive exploratory study was conducted from February to November 2011. The results recorded 36 genera of periphyton belong to three classes namely Bacillariophyceae, Chlorophyceae and Cyanophyceae. Diversity index (H ‘) ranged from 0.74 to 2.15. It is concluded that the diversity of periphyton in the waters of the River Belidawas low, with Ulotrik species, Nitzschia, and Synedra being the Dominant.

ISOLATION AND ANTIBACTERIAL ACTIVITY TEST OF ASSOCIATED BACTERIA FROM MARINE SPONGE Tetilla sp. Dian Pribadi Perkasa; Arie Budiyarto
Widyariset Vol 15, No 2 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

The marine sponge of Tetilla sp. collected near Gunung Kidul coast was studied for isolation of associated bacterial and its antibacterial activity. Sixteen bacterial strains were isolated from sponge Tetilla sp., four isolates among it showed ability to produce antibacterial metabolite. Cell extract of isolates were tested for antibacterial activity against Escherichia coli and Staphylococcus aureus using disc diffusion agar method. Cells extract of four selected isolate from late exponential phase and stationary phase broth culture showed antibacterial activity against Escherichia coli and Staphylococcus aureus. Thin layer chromatography analysis detected alkaloid and terpenoid in cell extract from stationary phase of isolates culture and none of it was detected in cell extract from late exponential phase of isolates culture.

IDENTIFIKASI Fase KOMPOSIT OKSIDA BESI - ZEOLIT ALAM HASIL PROSES MILLING Yosef Sarwanto; Grace Tj.S.; - Mujamilah
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

Iron oxide – nature zeolite composite has been obtained by using milling process with varied milling time of 1.5 hours, 4.5 hours, 9 hours, and 13.5 hours. Weight ratio of iron oxide to nature zeolite was set to 1:1. The resultof milling process was identified using X-ray diffraction (XRD) technique, then compared the pattern to JCPDSICDD (Joint Committee on Powder Diffraction Standard - International Centre for Diffraction Data) data base.XRD pattern of the composite showed that α-Fe2O3 phase growth with increasing milling time from 1.5 hours to 13.5 hours milled as a result of Fe3O4 oxidizing. Visual observation was done to know the binding of iron oxide to nature zeolite by immersing the composite in water media and attracting with magnetic field.

BIOLOGICAL ASPECTS OF BANANA SHRIMP (Penaeus Merguiensis DE HANN) IN THE PEMANGKAT WATERS, WEST BORNEO Duranta Diandria Kembaren
Widyariset Vol 16, No 3 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Continuous fishing can threat the sustainability of shrimp resources. Studying of biological aspects can be used as a basic knowledge to manage shrimp responsible fisheries. Research about biological aspects of banana shrimp (Penaeus merguiensis) was conducted on April to December 2011 in Pemangkat waters, Sambas district. Data were collected from the fisherman landed in Pemangkat fishing port. Composition of male and female were an unequal in sex ratio. The shrimps was dominated by the size of 23 to 25 mm on carapace length. Individually, female carapace length was 30% longer than male. The growth characteristic was isometric in male and female. Spawning occurred all year around, and reach its peak on November. Carapace length at first capture of banana shrimp was 23,75 mm and carapace length at first maturity was 33,67 mm. Fishing pressure at this water was high and the capture dominated by the young shrimp. This condition threat the sustainability of shrimp fisheries.

EFFECT OF PARENTAL HARMONY ON ADOLESCENTS SEXUAL RISK BEHAVIOUR IN URBAN AREAS OF INDONESIA Suparmi Suparmi
Widyariset Vol 18, No 1 (2015): Widyariset
Publisher : Pusbindiklat - LIPI

Adolescents are at high risk for a number of negative health consequences associated with early and unsafesexual activity. This study is aimed to analyze the effect of parental harmony on adolescents sexual risk behaviourin urban areas. There were 1,491 adolescents entered into the analysis. The result shows that adolescents whohad good parental harmony relationship accounted for 66% of the reduction to had sexual risk behaviour ratherthan those who did not. Adolescents who had juvenile delinquency increased 3.2-fold to had sexual risk behaviourrather than who did not. Main policy implication of this finding is the importance of parental harmony relationshipto reduce adolescents sexual risk behaviour.

INDONESIA’S POLICY ON THE LAND BORDER AREA MANAGEMENT WITH MALAYSIA (An Evaluative Study in the Entikong District) Sandy Nur Ikfal Raharjo
Widyariset Vol 16, No 1 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

ndonesian government has implemented new paradigm on the land border area management by combining security and prosperity approaches. This Evaluative research compared Entikong border area condition in West Kalimantan when the combined-approach based policy is implemented, with the condition before. The result showed that this policy is potensial to solve infrastructure weakness, trade dependence on Malaysia, poor education, threat to nationalism, and lack of coordination among institutions. But, this combined approach also proved lack of attention toward socio-culture aspect in local community. This research recommends Indonesian government to ask for active society involvement in decision making process and implementation of the policy on the land border area management. Thus, the objectives of security, prosperity, and socio-culture will be reached together.

MODIFIKASI PEMBENTUKAN LAPISAN Zn PADA PERMUKAAN BAJA DUAL FASA DENGAN NITRIDASI RINGAN Arbi Dimyati
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

In this work an experimental series was performed in order to modify the surface properties and galvanise ability of the dual-phase steel by the nitriding in an ammonia containing atmosphere (bright nitriding) during re-crystallisation annealing. The samples were characterized using various electron microscopy techniques and special preparation methods. The investigations show that during re-crystallization annealing with a relatively short duration because the nitrides formation with a large amount of nitrogen atoms can incorporate into the surface near area of the steel. The steel microstructures and the oxidation behavior of the alloying elements on the steel surface are positively changed. The decreasing of oxidation causes the surface activation that increases the steel/zinc reactions during hot-dipping. The formation of the Fe7415 inhibition layer also changes. The best quality of the zinc layer surfaces are achieved on the samples after annealing with ammonia concentration between 0.25 and 1 vol.-%. Therewith a new alternative for controlling the hot-dip galvaniseability of highstrength steels are proposed.

PROPERTIES OF BINDERLESS PARTICLEBOARDS FROM OIL PALM EMPTY FRUIT BUNCH (Elaeis guineensis Jacq.) Ratri Yuli Lestari
Widyariset Vol 16, No 2 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

The objective of this investigation was to evaluate the properties of binderless particleboard from oil palm empty fruit bunches (OPEFB). The pretreatment was boiling in water for 60 minutes and then dried. The dried OPEFB was shredded into fibers and cut into particles (1–5 cm and 6-10 cm). The particles were formed on alluminium foil and then pressed at temperature of 150°C for 10 minutes using pressure of 25 kgf/cm2, 30 kgf/cm2, and 35 kgf/cm2. Particleboard samples were made with a target density of 0.7 g/cm3. The value of density, moisture content, modulus of rupture (MOR), and modulus of elasticity (MOE) were determined based on Japan Industrial Standard (JIS) A 5908: 2003. The particleboards density were 0.566~0.636g/cm3 and the moisture content were 5.17~7.13%. The highest value of MOR and MOE were 2.52 N/mm2 and 223.29 N/mm2. It’s from particleboards with the particle size of 6-10 cm and the pressure of 35 kgf/cm2. The physical properties of particleboards were met the JIS standards while the mechanical properties were not met the standard.

PENGGUNAAN INSEKTISIDA RUMAH TANGGA ANTINYAMUK DI DESA PANGANDARAN, KABUPATEN PANGANDARAN Nurul Hidayati Kusumastuti
Widyariset Vol 17, No 3 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

There are many kinds of house insecticide used as antimosquito insecticide. An unsafe application of it might affect our health. Pangandaran Village is a malaria and dengue hemorrhagic fever (DHF) in the district of Pangandaran, West Java. The aim of this study is to describe the use of house insecticide by many households in Pangandaran village. An exploratory study with cross-sectional design is conducted for four months starting from April 2014. Several interviews were randomly assigned to 201 households to discover the use of house antimosquito insecticide. Sample collecting method is done using multiple random sampling over each subvillage. The numbers of household interviewed are determined by the proportion number of household in each neighborhood unit (RT). There are 82% households using antimosquito for more than ten years (59%) and using repellent daily (19.4%). Comfort is the main reason why most households use antimosquitos (46%). Households use insecticides one time at night (79.6%) and spend less than IDR 5,000 to buy insecticide. This study provides supporting information for local stakeholders over the use of house insecticide that can be benefitted as a reference for developing policy on vector control disease.

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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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