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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 20 Documents

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Search results for , issue "Vol 13, No 3 (2010): Widyariset" : 20 Documents clear

EVALUASI PERTUMBUHAN TANAMAN UJI KETURUNAN JATI (Tect ona gra ndis L.f.) MENGGUNAKAN ANALISIS MULTIKRITERIA Hery Kurniawan
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

This research was aimed to determine the rank of tree family in the teak (Tectona grandis L.f.) progeny test based on multi criteria analyses. Research was conducted using deductive approach by collecting data on experiment site consisting of 10 blocks. The proposed criteria and indicators were based on literature study focusing on (1) simple measurement in the field, (2) principle of management objective, and (3) basic principle of silviculture. The selected criteria were stem quality, crown condition and tree growth, and each criteria was derived into indicators and verifiers. Based on the frequency of appearance in the top 25% on each block, the top ten superior families were seedlot number 90 with 8 times, followed by seedlot number 11 and 31 with 7 times, and then seedlot number 10, 106, 124, 15, 18, 4, and 46 with 6 times, respectively.

Stream Water Temperature Studies at Forested Watersheds : a Review Luki Subehi
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

Temperatur air sungai yang berpengaruh terhadap proses biologi, kimia, dan fisika yang terjadi di dalam ekosistem sungai telah menjadi perhatian utama dari sejumlah kegiatan para peneliti. Dianalisis secara statistik menggunakan root mean square (Rms), harmonik metode (A: Amplitude, φ: waktu tunda) dan perubahan dari spesifik debit (ΔQs), temperatur udara (ΔTa) dan temperatur air (ΔTw) selama periode hujan telah dilakukan dalam penelitian ini. Berdasarkan nilai-nilai fluktuasi, kita bisa mengklasifikasikan daerah aliran sungai menjadi tiga kelompok luasan DAS: kecil, menengah, dan besar. Di daerah aliran sungai besar, nilai fluktuasi Tw dijelaskan sebagai pengaruh radiasi matahari dan proses perpindahan panas, sedangkan daerah aliran sungai kecil, menunjukkan waktu yang lebih pendek bagi pola aliran yang mempengaruhi Tw. Selanjutnya, hasil analisis menunjukkan pola aliran yang berbeda, digambarkan oleh karakteristik loop histeresis antara Qs dan Tw di DAS menengah selama periode hujan. Perbedaan-perbedaan dalam loop histeresis dapat dijelaskan sebagai perbedaan Tw dan kecepatan respons terhadap curah hujan antara aliran permukaan/aliran bawah permukaan dan aliran air tanah.

RANCANGAN SENSOR PERGESERAN TANAH BERBASIS SERAT OPTIK UNTUK DETEKSI LONGSOR: STUDI AWAL (Measurement of Curvature Optical Fiber Loss As A Displacement Sensors In Landslide Detector) Wildan Panji Tresna; Dwi Hanto; Bambang Widiyatmoko
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

The optical extensometer based optical fiber have been designed by Single Mode Optical Fiber with the basic component are light, optical fiber in circling condition and photodetector. Early experiment have been carried out loss optical fiber curvature of the correlation factor of a circle diameter of the displacement. Measurement results showed differences to laser intensity at the position of the optical fiber is straight and the position make to curve. Measurement made on the condition R1 = 18.7 mm as L1 = 0 mm until R2 = 15.6 mm as L2 = 9 mm. The working principles of equipment that is create when a laser through optical fiber missed in the curve and pull up to a certain frictions the loss geometry would be the bigger.

PERBANDINGAN LUARAN MODEL GLOBAL ATMOSFER CCAM dan GFS di wilayah INDONESIA DAN SEKITARNYA Donaldi Sukma Permana
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

The aim of this research was to compare Conformal Cubic Atmospheric Model (CCAM) and Global Forecast System (GFS) prediction against GFS initial condition as control up to 7 days in the future over Indonesia and northern subtropical regions of Indonesia in September – October – November (SON) 2008. Comparison was conducted in spatially to observe the similarity pattern by calculating spatial correlation value for some basic parameters in several pressure vertical levels. The result described that output of both models showed general similarity pattern in SON 2008 over Indonesia and northern subtropical regions of Indonesia, obtained spatial correlation values indicated GFS prediction was slightly better compared by CCAM prediction. For some parameters, CCAM output showed a particular problem in low-pressure vertical level (250mb). There was probably a problem with the vertical interpolation of the GFS initial data onto the CCAM conformal-cubic grid.

RESPONS BAWANG MERAH TERHADAP PEMUPUKAN ORGANIK DI LAHAN KERING (Respond of Onion to Organic Fertilizer in Dry Land) I Nyoman Adijaya
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

Onion demand in Bali is supplied from other provinces in about 40%, therefore onion is one of prospective commodity to be developed in Bali. An assessment on respond of onion to organic fertilizer was done in Sanggalangit Village, Gerokgak District, Buleleng Regency of Bali Province from July to September 2008. The trial was designed using Randomized Complete Block Design with 5 replications. Fertilization treatments tested were RB 10 t ha-1, cow urine 15,000 l ha-1, combination of RB 5 t ha-1 + cow urine 7,500 l ha-1, and without fertilizer as control. Organic fertilizer could improve physical character of the soil in term of decrease bulk density from 1,149 g cm-3 to 1.111 g cm-3–1.085 g cm-3 and improve growth and yield of onion. Onion yield significantly increased 32.71%–60.77% compared to control. Utilization of organic fertilizer, RB and cow urine, which will applied either singly or combination can improve physical character of the soil and increase the yield of onion.

DAMPAK ALIH FUNGSI LAHAN TERHADAP KEBERLANJUTAN SUPLAI AIR DI WADUK SUTAMI, MALANG, JAWA TIMUR M. Luthful Hakim
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

The research about impact of landuse change from forest become the non-forest in watershed of Upstream Brantas on decreasing water supply in Sutami Dam have been done. The objective of this research were: 1) to study impact of landuse change from forest become the non-forest (shrubs, farm/garden, or urban) on water supply sustainability in Sutami Dam, and 2) to determine an optimal landuse of forest on water supply sustainability. The location of research site is on watershed of Upstream Brantas, Malang, East Jawa. The methods of data analysis were: 1) analysis of landuse type, 2) analysis of hydrology, 3) model accuration testing, and 4) optimation of landusearea and position on decreasing runoff discharge and increasing baseflow discharge. The result showed landuse change from forest become the non-forest during 6 year (1997-2003) a significant impact on water production decrease in Sutami Dam (increasing runoff discharge 79% and decreasing baseflow discharge 90% compared to year 2001. The optimal landuse of forest area to sustainability of water supply was 43%.

RANCANG BANGUN SISTEM OKSIDASI LAPISAN TIPIS SEMIKONDUKTOR OKSIDA LOGAM UNTUK SENSOR GAS CO Bambang Herlambang
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

In this research, manufacture of oxidation system for oxidation process of metal thin film has been done. This process is required to obtain metal oxide semiconductor which can be used as CO sensor. The system comprises furnace, temperature sensor, temperature controller, O2 gas tube, and flow meter. The system developed was then tested to know its performances by observing its temperature conditioning and controlling ability the furnace. The data processing results show that the value shown by the K thermocouple and digital temperature transducers can be stated with equation y = 0.9974x – 1.4339 where x is the value shown by type K thermocouple and y is the value shown by digital temperature transducers, while standard error is 2.24%. X-Ray analysis on Sn thin film samplesthat were oxidized for 12 and 24 hours at 400°C show that SnOx contents increase with increasing of oxidizing duration. Samples oxidized for 24 hours has little increasing of SnOx content than sample with oxidation for 12 hours due to oxidation saturation occurred on thin film surface.

PENGARUH KARBON MONOKSIDA TERHADAP OZON PERMUKAAN Novita Ambarsari; Ninong Komala; Afif Budiyono
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

Surface ozone is one of air pollutant that can be very dangerous for human health and many other aspects of the living things. The effect of carbon monoxide (CO) to surface ozone formation has been studied. We used Dasibi Monitor Ozone and Horiba Ambient Carbon Monoxide Monitor to measure surface ozone and carbon monoxide concentration at air pollution monitoring station belong to LAPAN Bandung along 2008. The result shows that carbon monoxide affecting 20%–80% formation of surface ozone with negative correlation. A normal photochemical reaction is the main factors. Daily variation of surface ozone shows lower concentration occur in the morning and night, and higher concentration occur in the evening. While, daily variation of CO shows maximum concentrationin the morning and night, and lower in the evening.

BIO ASSAY ANTIOKSIDASI EKSTRAK DAGING BUAH SALAK BONGKOK (Salacca edulis Reinw.) DENGAN KHAMIR Candida sp . Y390 Dede Falahudin
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

This research was conducted to determine antioxidant activity of Bongkok snake fruit crude extract by in vivo assay using yeast cell Candida sp.Y390 as experimental model. Crude extract has secondary metabolite compoundsuch as alkaloid, saponin, flavonoid, phenolic, and tannin. Mature crude extract of 200 ppm concentration potentially inhibits lipid peroxidase of yeast cell which has been treated by paracetamol 0.3%. The inhibitation ofthe 200 ppm extraxt concentration is higher than vitamin 0.225 mg/ml reaching 61.06% and 53.65% respectively.

PENGGUNAAN EGM2008, EGM1996 DAN GPS-LEVELING UNTUK TINGGI UNDULASI GEOID DI SULAWESI Dadan Ramdani
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

GPS is used increasingly and commonly in the last past year in all aspect of live. But the height information in GPS is not the actual height. To convert it to actual height is needed geoid undulation. Geoid has three wavelengthsi.e. short, medium and long. From these three geoids, the long wavelength which is obtained from the global model is the important one to determinant the geoid. In 2008 Pavlis NK from NGA had established the global model (EGM2008) which has orde and degree of 2190. This global model was validated and is used to calculate the geoid undulation in Sulawesi. EGM2008 Validation was carried out with comparation between the geoid undulation of EGM2008 and EGM1996 with the geoid undulation from GPS-Leveling’s observation data. The result of this validation shows that EGM2008 in Sulawesi has better results compare with EGM1996. The standard deviation of EGM2008 is 0.88 cm better than EGM1996.

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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

Location
Kota adm. jakarta selatan,

Dki jakarta

INDONESIA