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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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TROPHODYNAMIC ACCUMULATION OF BROMINATED FLAME RETARDANTS IN BIOTA OF JAKARTA BAY Agus Sudaryanto; Tomohiko Isobe; Shinsuke Tanabe
Widyariset Vol 15, No 2 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

The level of contamination, bioaccumulation and potential trophic transfer of toxic pollutants known as brominated flame retardants (BFRs), such as polybrominated diphenyl ethers (PBDEs) and hexabromocychlododecanes (HBCDs), was examined in biota representing different trophic levels in Jakarta Bay. Various organisms were collected using several catching methods during July-August 2007 at eastern part of the bay and were analyzed for nitrogen (N) and carbon (C) stable isotopes, 14 PBDE congeners and three HBCD isomers using GC-C-IRMS, GC-MS and LC-MS/MS, respectively. Analysis of N and C indicated that the biota was composed by different trophic levels within the Jakarta Bay ecosystem. Concentrations of total PBDEs and total HBCDs varied according to species, ranged from 1.6 ng/g lipid wt. to 57 ng/g lipid wt. and below detection limit (nd) to 4.1 ng/g lipid wt, respectively. Furthermore, there was significant positive correlation between trophic level (TL) and concentration of PBDEs was found, but not HBCDs. Trophic Magnification Factors (TMF) values of PBDEs ranged 0.63–3.0 with only two congeners (BDE-47 and BDE–100) having TMFs greater than one.

CATATAN BARU LOKASI DAN INANG UNTUK Cervonemella rear doni BEVERIDGE, 2001 DAN Cloac ina spp . DI INDONESIA Kartika Dewi; Yuni Apriyanti; Nanang Supriyatna
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

Papua and offshore islands have rich in fauna diversity. Four Cloacininae nematodes have joint been reported from Salawati Island, a small island nearby Papua, i. e. Cervonemella reardoni Beveridge, 2001, Cloacina syphax Beveridge & Speare, 1999, Cloacina polymela Beveridge, 2002 and Cloacina procris Beveridge, 2002. They are from Dorcopsis muelleri (Schlegel, 1866). Herein, those nematodes are also reported with descriptions and illustrations.

PENGARUH METODE PEMBELAJARAN DAN KEMAMPUAN AWAL TERHADAP HASIL BELAJAR MATEMATIKA (Studi Eksperimen di MAN 3 Jakarta ) Farida Hanun
Widyariset Vol 13, No 1 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

The aim of this research is to try the effect of teaching method in increasing study result of student in mathematicinterconnected with first ability of student. The research was conducted at MAN 3 east Jakarta at the firstsemester of the academic year 2008-2009 . The sample was selected by simple random sampling technique andthe size was 84. This research used experiment method with factorial design 2 x 2 and the data were analyzed byusing Two-way Anova and T- test at the level of significance α = 0,05. The resulted in four findings i.e.: 1) Resultof study on the students who used inquiry methods was higher than those used conventional method, 2) Therewas interaction influence between teaching methods and first ability about the result study of mathematics, 3) Theresult study of mathematics students that have high first ability who used inquiry method was higher than thoseusing conventional methods, 4) The result study of mathematics students that have low first ability who used inquirymethods was lower than used conventional methods

BEEF CATTLE BUSINESS RESOURCES AND LAND TENURE: CATTLE BUSINESS PERFORMANCE INCOME FARMERS CONTRIBUTION Rahmi Wahyuni
Widyariset Vol 18, No 1 (2015): Widyariset
Publisher : Pusbindiklat - LIPI

Integrated farming is an alternative effort in order to improve business efficiency in beef cattle farming land.The extent to which it can flourish and contribute to is an exciting thing to assess. Research conducted at the centerof beef cattle in Nagari Sungai Kamuyang, Subdistrict Luak, District Lima Puluh Kota, West Sumatra in 2013.The aim is to analyze the relationship mastery of agricultural resources (land) with cattle control, and its impacton business performance of livestock and household income structure of farmers, survey collection methods, datacollection using structured questionnaires and in-depth interviews. Determination of the respondents conducted by purposive sampling involved 30 farmers. Data were analyzed by descriptive quantitative and qualitative and presented in tabular form as well as a SWOT analysis. The results showed: (a) The relationship between the area of agricultural land ownership by the number of cattle is that the more the number of farms ownership increasing numbers of livestock . Land tenure of >0.5 ha has five cattles. (b) Contribution of the cattle business in research area with agricultural land <0.5 ha is <35 % of total farm household income. (c) Contribution of the cattle business with land holdings >0.5 ha is >40% of total farm household income. Profits per three cows Rp2,786,500.00/periode. R/C = 1.129. This means cattle business is well worth the effort. B/C = 0.129 profits earned is 12.9% of the costs incurred. (d) Priority beef cattle business development strategy is cooperation with other agencies in thedevelopment of feed by utilizing the available land, the provision of knowledge and technology to farmers in order to develop the cattle business, collaboration with agencies planter capital.

INDONESIAN TWITTER USER NATIONALISM DISCOURSE: #INDONESIAUNITE CASE STUDY Ibnu Nadzir Daraini
Widyariset Vol 16, No 1 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Social networking sites, is one of the new forms of communication media that have an impact on changing modes of human interaction. One of the social movement-based social networking site in Indonesia is #IndonesiaUnite. This movement began as an effort to show the Twitter users in a positive representation of Indonesia after the bombing. In its development, this movement turned into a collective movement that construct the ideas of nationalism. This paper aims to understand the construction process of nationalism discourse that emerged from the #IndonesiaUnite movement. In addition, this study also attempts to understand the role of social networking sites in the spread of the discourse. In order to answer that questions, discourse analysis is utilized as an analysis method. It turns out that social network sites affecting discourse to spread rapidly. It is caused by social network features that allows its user to see the discourse construction process.

PENGARUH PENAMBAHAN POLISTIRENA TERHADAP SIFAT MEMBRAN SELULOSA ASETAT BERBAHAN DASAR LIMBAH TAHU Jaka Rachmadetin
Widyariset Vol 13, No 2 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

Soybean curd whey, which is discarded as a waste, can be used as starting material for the preparation of cellulose and cellulose acetate membrane. However, due to its poor mechanical properties, blending with polystyrene will strengthen to the membrane. Nata de soya was made by soybean curd whey then was dried to produce cellulose flake. Cellulose flake was reacted with acetylation reagent, acetic anhydride, and other solvents to produce cellulose acetat flake. It was then mixed with polystyrene to form blend of cellulose acetate:polysyrene membrane with 100:0, 95:5, 90:10, 85:15, and 80:20 in ratios. These membranes were characterized by water flux, rejection index, and tensile strength. The results showed that cellulose acetate had produced a water content of 4.3%, and acetyl degree of 43.26% (equal to substitution degree of 2.8-3.0). The highest water flux membrane was made of 80:20 (164.23 l/m2., the highest rejection index was from 90:10 was 31.65%, and the highest tensile strength membrane was obtained from 80:20 (24.11 kgf). In conclusion the addition of polystyrene could increase the water flux and tensile strength of membrane, but it decrease the rejection index.

IDENTIFICATION OF REGIONAL DEVELOPMENT PATTERN IN WEST JAVA USING THE MULTI-DIMENTIONAL SCALING AND FACTOR ANALYSIS METHOD Wargyawati, Ni Made Gilang
Widyariset Vol 16, No 1 (2013): Widyariset
Publisher : LIPI-Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (49.396 KB)

Application of the Multi-Dimensional Scaling (MDS) combined with Factor Analysis are able to extract dimensions or factors or components that affect the pattern of development in the area of West Java. Those dimensions are analyzed and inferred from selected regional growth variables which are translated from several relevant theories. The result of the Factor Analysis shows that there are two components that play a role in regional development in West Java. The first is the Human Resources (HR) which is derived from life expectancy, adult literacy, mean year of schooling, and road services variables. The another is concluded as economic factors which is derived from GDP per capita variabel and local investment. The two components or factors can explain about 69,60% of all variances. Combined with MDS, the analysis obtains 4 typologies of region, i.e. the region with both economic and HR factors are positive (+), the region with an economic factor (+), but the HR factor (-), the region with an economic factor (-), but a human factor (+), and the region with both economic and HR factors are negative (-). It can be concluded that the regional development in West Java requires a balanced concern over human and economic development. MDS results show economic growth is only enjoyed by few areas, so that the future needs of regional development should be based on typology obtained in this research.

POTENSI ANTIOKSIDAN DAN AKTIVITAS ANTIPROLIFERASI EKSTRAK KUNYIT PUTIH (Curcuma zedoaria Rosc.) PADA SEL HELA Saefudin Saefudin; Fauzia Syarif; Chairul Chairul
Widyariset Vol 17, No 3 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

The aim of this study is to determine the antioxidant potential and anti-proliferative activity of Curcuma zedoaria Rosc extract on Hela cells. Two types of materials, such as water and ethanol extracts, were tested at different dose levels (1, 5, and 10%). The potential of antioxidant extract was tested by observing the peroxide value (POV) and prophylactic properties of superoxide (SO). The effects of Cytotoxic extracts were tested by observing the anti-proliferative properties on Hela cell morphology. Results showed that both water extract and ethanol extract contain antioxidants with higher value of superoxide and peroxide than a-tocopherol. Antioxidant potential of Curcuma zedoaria extract is evidential at its high concentration of 10%, but is less significant at lower concentration of 1 and 5%, when compared to the potential of positive control (a-tocopherol) and negative control (non-extract mixture). Antiproliferative activity of Curcuma zedoaria extracts at low concentration (1 and 5%) is not effective. At high concentration of 10%, anti-proliferative activity is effective. Cytotoxic effect of water extract of the rhizome of Curcuma zedoaria at the concentration of 10% changes the Hela cell morphology, but not cell wall rupture. High concentration of ethanol extract causes Hela cells to change its shape, rupture the cell walls, and fragment the cells.

AN ASSESSMENT OF THE EFFECT OF RAIN CHARACTERISTICS AGAINSTS THE VOLUME OF WATER FLOW AND THE WEIGHT OF SUSPENSION IN KARST AREA Marcellinus Mandira Budi Utomo; Hatma Suryatmojo; Sri Astuti Soedjoko
Widyariset Vol 15, No 3 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

The watershed management needs data of hydrology circulation, e.g. volume of water flow and weight ofsuspension. Rain is a main control for hydrology circulation. Rain characteristics need to be assessed for their effectagainst hydrology circulation. This research was aimed to assess the effect of rain characteristics and to createan equation of volume of water flow and weight of suspension in karst area. A combination method of explorationand statistic calculation was used in this research. Parameters of volume of water flow and weight of suspensionwas measured at several different of water levels. The data were analyzed to assess the rain characteristics thatinfluenced hydrology circulation. The result showed that 30 minutes maximum intensity (I 30’) affected the volumeof water flow and weight of suspension. The functions raised from this research were V = 563.646 (I 30’ )–644.063and W = 59.660 (I 30’ )–209.758.

GEOGRAFI DIALEK BAHASA MENTAWAI Rita Novita
Widyariset Vol 12, No 3 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

This research aims to portray the geography dialect in Mentawai Regency. The dialects in Mentawai Island are observed using dialectology approach. There were three dialects, namely: north Siberut dialect, South Siberut dialect, and Sipora-Sikakap dialect. Then, the sub-dialects found were Sipora sub-dialect and Sikakap sub-dialect. There are dialect and subdialect which are clearly seen in the map of dialect geography of Mentawai Regency.

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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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