cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
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
Widyariset
Published by Pusbindiklat Peneliti LIPI
ISSN : -     EISSN : 24610976     DOI : 10.14203
Core Subject : Science, Engineering,
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 476 Documents
 34   35   36   37   38 
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

Abstract

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
IDENTIFICATION OF SEDIMENT PROPERTIES DEGRADATION OF DELTA CIMANUK DEPOSIT BASED ON STRATA BOX DATA Riza Rahardiawan
Widyariset Vol 16, No 3 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.16.3.2013.385-394

Abstract

Knowledge on physical properties of seafloor sediments is essential in planning offshore construction, in particular oil and gas construction. Changes in the physical properties of sediments such as faults and fractures, as well as the presence of gas within seafloor sediments can be detected as a decrease in acoustic wave velocity due to reduction in sediment shear strength. Normalization of Cimanuk River in early 1980s has resulted in higher sediment influx and increasing rate of compaction that change the physical properties of the sediment. Analysis of amplitude and wave velocity using software SonarWiz 5 on the records obtained from sounding equipment: Sub-Bottom Profiler type ODEC Strata Box and Bathy 1500, show significant change in wave speed that is caused by shallow gas seepage associated with fractures in the Polygonal Fault System (PFS ). This fault system formed as a result of diagenetic processes of fine grain sediment and reduction of the sediment shear strength due to accumulated sediment cover. Shallow gas seepage itself is commonly found in organic-rich marine sediments and are usually composed of methane.
PENGGUNAAN INSEKTISIDA RUMAH TANGGA ANTINYAMUK DI DESA PANGANDARAN, KABUPATEN PANGANDARAN Nurul Hidayati Kusumastuti
Widyariset Vol 17, No 3 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.17.3.2014.417-424

Abstract

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.
THE NONMETALLIC COMPONENTS IMMERSION TEST OF THE FUEL LINE SYSTEM OF MOTOR VEHICLES WITH BIOSOLAR (B5) Emi Yuliarita
Widyariset Vol 1, No 1 (2015): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.1.1.2015.%p

Abstract

Biodiesel is a renewable alternative energy has now been used widely. The use of biodiesel in diesel fuel vehicles is the hope of anticipating  the needs of increasing diesel oil. This is  consistent with the national energy policy  where the energy mix by 2025 is expected to use alternative energy  can  reach 25%. However, biodiesel has solvent  properties as a good  enough  so that it will be able to influence the  non-metallic  components of   the fuel  line  system  of  motor  vehicles. In  this  study  conducted immersion  test  against non-metallic components  of  the fuel  line system  of  motor  vehicles  Isuzu Panter  which refers   to  the  test  method  SAE  1747  with  the  aim  to  see  the  nature  of the  fuel compatibility with the non-metal components. After soaking material characterization tests performed  by measuring the volume and weight. The results  showed  that  the use of 5% biodiesel  in diesel  fuel cause nonmetallic components undergo expansion/swelling  and contracts in particular rubber, plastic, and  cork. The  biggest  change  occurred  shrinkage of  71.4% on  the  rubber cap tank-solar, Rubber Tank Low – Solar is 28.6% and the Rubber Tank Up-Solar is 25.5% respectively in the phase after 100 hours  of  immersion.
EFFICACY OF MYCORRHIZAE AND Trichoderma AS A BIOLOGICAL CONTROL OF BASAL STEM ROT DISEASE (Ganoderma) AND AS A PROMOTOR OF OIL PALM SEEDLING GROWTH Donnarina Simanjuntak; Fahridayanti Fahridayanti; Agus Susanto
Widyariset Vol 16, No 2 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.16.2.2013.233-242

Abstract

The experiment was in randomized block design which consisted of 14 treatments with 7 treatment combinations with Ganoderma infection and 7 treatment combinations without Ganoderma infections, there were 75 replications for each treatment combinations. The treatment combinations included applications of Mycorrhizae, Trichoderma, and standard fertilizer. Variables observed were disease incidence of Ganoderma, plant height, number of frond, and weight mass. The results showed that the application of Mycorrhizae was able to control basal stem rot disease until 7 months after the application of Ganoderma. A single application of Mycorrhizae had not been able to promote seedlings growth until 10 months. The role of Mycorrhizae in promoting seedling growth until 10 months was demonstrated when combined with Trichoderma and standard fertilizer application.
NAKHODA KMP SENOPATI NUSANTARA DITINJAU DART SEGI HUKUM Gatot Teguh Rusliyanto
Widyariset Vol 12, No 3 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.12.3.2009.141-150

Abstract

KM Senopati was sinking on the passage from Kumai Kalimantan to Tanjung Emas Semarang, at Jepara north beach, Central Java on 29 December 2006. There were around 545 passengers on board in this accident in which hundreds of them lost their lives. Theory of sea transportation found that human errorf actor was the one of the causes in this casualties. At KMP SENOPATI NUSANTARA was found various awkwardness though the ship had been assumed seaworthinesxs. Intention of this research is to know any negligence factors of the Captain at KM. Senopati Nusantara casualties. The approach method applied is approach of jurisdictionalsociologist and specification of research applied is descriptive analysis qualitatively. Data used at this research are primary and secondary data. Based on the result, negligence aspect is one of the many factors of KM Senopati Nusantara casualties. Captain was guilty because of his negligence causing many people died and performed within implementing position as occupation.  
LOCAL RICE RESPONSE TO MENTIK POWDER TECHNOLOGY APPROACH SRI (SYSTEM OF RICE INTENSIFICATION) AND INTEGRATED CROP MANAGEMENT Kristamtini Kristamtini; Setyorini Widyayanti; Siti Rahayu
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.14.3.2011.565-570

Abstract

Mentik wangi is one of the local rice varieties that need to be conserv and explored its potential. Therefore, research is needed that aims to determine the response of local rice fragrant mentik technology approach System of Rice Intensifi cation (SRI) and Integrated Crop Management (ICM). SRI goals and ICM on the same principle is to increase farmers’ production with different targets and different managers. Research conducted in Jayan Village, Kebon Agung, Imogiri in May 2009 (MK 2009). Research carried out on land owned by farmers with a total area of 2000 m2. Planted rice varieties are fragrant with mentik treatment 2 repeated 3 times. The fi rst treatment is the SRI technology approaches, including: age of young seedlings (14 the day after the scatterplot), spacing of 30 x 30 cm,10 tons/ha of organic fertilizer, without the use of chemical pesticides. The second treatment is the approach of Integrated Crop Management (PTT), including: age of young seedlings (14 the day after the scatterplot), spacing of 25 x 25 cm, 2 tons/hectar of organic fertilizer, 250 kg/ha Urea, 50 kg/ha Sp-36 and 50 kg/ha KCL). The results showed that the results achieved mentik fragrant rice with higher SRI approach (10.89 tons/hectar)compared with ICM technology, technological approach (9.22 tons/ha). Mentik wangi rice produced by SRI and the technology approach is pulen with ICM (SRI amilosa content = 15.65% and ICM = 15.96%), while levels of macro and micro elements mentik fragrant rice produced with higher ICM approach (Phosphor = 15.95 ppm; Fe = 2.48 ppm; Zn = 0.961 ppm; Cu = 0.426 ppm and Mg = 0.670 ppm) compared with the SRI approach (Phosphor = 15.13 ppm; Fe = 2.35 ppm; Zn = 0.648 ppm; Cu = 0.371 ppm and Mg = 0.623 ppm)
COMMUNITY STRUCTURE OF MAKROZOOBENTHOS IN ESTUARY OF BANYUASIN RIVER OF SOUTH SUMATRA Ni Komang Suryati; Eko Prianto
Widyariset Vol 15, No 2 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.15.2.2012.471–478

Abstract

Community structure of macrozoobentos in estuary of Banyuasin important as based of knowledge about bioindicator environtment. The aim of this research was to examine the community structure of macrozoobenthos in estuaries Banyuasin river of South Sumatra. This research conducted by field survey method. Field sampling was selected by purposive random sampling. Macrozoobenthos samples were taken using ekman grab. Further silt that is picked up from the tool was filtered using a filter to separate from the mud. Samples was inserted into the bottle sampel and then identifyed in the laboratory. Results showed that the highest density of macrozoobenthos occured in Oktober and the lowest in April. Diversity of macrozoobenthos based on index Shannon-Wiener average of all station showed a value of 1< H’ < 3. There were significant differences (P<0,05) at each sampling month and the highest value found in June amounting to 1,82. The value of uniformity during the research as seen from the difference in observation time was low. For environtmental quality criteria based on the diversity index Shannon-Wiener showed that the value of IML is 1,62 which means that in the area in the station that is contaminated with medium level.
DAMPAK ANGKUTAN SEDIMEN TERHADAP PEMBENTUKAN DELTA DI MUARA SUNGAI BONE, PROVINSI GORONTALO Ari Mulerli
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.13.3.2010.35-39

Abstract

Big sediment transport that caused the agradation has been created at estuary. The sediment transport settling procces at estuary made the river bed elevation increasing, otherwhise, this fenomenom can closed the connector area between estuary with the coastal and ocean. Evaluation has been done to observe the effect of sediment transport due to estuary changes. In implementation, case study about the agradation at estuary of Bone River, Gorontalo. In this studi, characteristics of estuary are observed first to get the information about the morfological of study area. The evaluation uses Surface-Water Modelling System (SMS) as the main software to analysis. From the numerical model with do nothing scenario shows that the agradation will be created among 36.18 cm every year and if we improvment the estuary, agradation will reduce about 28.14 % and the average of bed level changes about 25.99 cm.
ADAPTATION OF FIFTY GENOTYPE GOGO RICE ON THREE ENVIRONMENTAL ULTISOL SOIL ACIDITY Agus Subekti
Widyariset Vol 14, No 2 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.14.2.2011.285-294

Abstract

Adaptation genotype upland rice at three environment acidity soil of Ultisol have been done in Toho West Kalimantan. This research consist of three acidity environment: environment of pH 4.5 ( without lime), environmental of pH 5.0 ( lime with dose 1 x Al-dd), and environment of pH 5.5 ( lime with dose 1.5 x Al-dd). Each environment arranged in Randomized Block Designs (RBD) with treatment fifty genotype which repeated twice. Result of research indicated that genotypes which is good to be planted at environment of pH 4.5 ( without lime) are: Gajah Mungkur, IR 53234, PR 36, IR 60080 , S-4325-D-1-2-3-1, BP 1153 C-9-60, and BP 720 C-5-Si-60. There are correlation of phenotypic and genotypic indirectional between absorption of P, panicle length, number of fill grain per panicle, and 1.000 fill grain weight with grain weight per clump.

Page 36 of 48 | Total Record : 476

 34   35   36   37   38 

Filter by Year

2009 2022


Reset
Filter By Issues
All Issue Vol 8, No 1 (2022): Widyariset Vol 6, No 2 (2020): Widyariset Vol 6, No 1 (2020): Widyariset Vol 5, No 2 (2019): Widyariset Vol 5, No 1 (2019): Widyariset Vol 4, No 2 (2018): Widyariset Vol 4, No 1 (2018): Widyariset Vol 3, No 2 (2017): Widyariset Vol 3, No 1 (2017): Widyariset Vol 2, No 2 (2016): Widyariset Vol 2, No 1 (2016): Widyariset Vol 18, No 2 (2015): Widyariset Vol 18, No 1 (2015): Widyariset Vol 1, No 1 (2015): Widyariset Vol 17, No 3 (2014): Widyariset Vol 17, No 2 (2014): Widyariset Vol 17, No 1 (2014): Widyariset Vol 16, No 3 (2013): Widyariset Vol 16, No 2 (2013): Widyariset Vol 16, No 1 (2013): Widyariset Vol 15, No 3 (2012): Widyariset Vol 15, No 2 (2012): Widyariset Vol 15, No 1 (2012): Widyariset Vol 14, No 3 (2011): Widyariset Vol 14, No 2 (2011): Widyariset Vol 14, No 1 (2011): Widyariset Vol 13, No 3 (2010): Widyariset Vol 13, No 2 (2010): Widyariset Vol 13, No 1 (2010): Widyariset Vol 12, No 3 (2009): Widyariset Vol 12, No 1 (2009): Widyariset More Issue