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Published by Pusbindiklat Peneliti LIPI

ISSN : - EISSN : 24610976 DOI : 10.14203

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

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INVENTARISASI ANGGREK EPIFIT DI KEBUN RAYA EKA KARYA BALI IG. Tirta; Sutomo Sutomo
Widyariset Vol 17, No 2 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

Inventory of epiphyte orchid species was conducted at Eka Karya Bali Botanic Garden on 26 September to17 October, 2009. The host trees were selected randomly (purposive randomized sampling), especially selected host trees for epiphyte orchid. The results showed that there were 34 known species of orchids belonging to 14 genera. Bulbophyllum was the highest number of species (seven species). Generally, epiphytic orchids grew on thin substrate with light intensity and mostly on zone IV. There were 162 species as host trees, which were dominated by Prunus puddum Roxb. ex Wall., Araucaria bidwillii Hook., Toona sureni (Blume) Merr., Syzygium racemosum (Blume) DC., and Syzygium zollingerianum (Miq.) Amsh.

SPEED CONTROL DESIGN OF THREE PHASE AC INDUCTION MO- TOR USING THE SPACE-VECTOR METHOD AND PROPORTIONAL INTEGRAL CONTROLLER (PI) Slamet Slamet
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

This research described about speed control of three-phase AC induction motor use space vector method and Proportional Integral (PI) controller. To determine the parameters of PI controller used Tuning Charts for PI Feedback Controllers. Measurement of motor speed used dc motor 12 volts functioned as a generator connected by Op-Amp circuit. Output Voltage Op-Amp interfaced to ADC Microcontroller as signal feedback from actual speed of triphase AC induction motor. Then in empiric is searched transfer function of the motor to determine value of the Kp (proportional gain), Ki (integral gain), θ (dead time), and τ (time constant). Testing system is done for set point maneuver from 480 rpm to 1,080 rpm, and then from 1,200 rpm to 480 rpm. Based on the result of research indicates that control system PI for speed of triphase AC motor can be controlled to reach stable condition, if maneuver set point under speciﬁ cation of nominal speed performance of three phasa AC induction motor for 900 rpm.

SELECTION OF CROSSING FACILITIES BASED ON CRITICAL GAP (CASE STUDY DHARMAWANGSA STREET, SURABAYA) Edwin Hidayat
Widyariset Vol 15, No 3 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

Pedestrians have a high risk to be hit by motor vehicle when they crossed the street, thus the choose ofappropriate cross facilities are very important. An alternative for choosing cross facilities are by using the CriticalGap method. This method is used to measure the possibility of crossing the street safely. This study was startedby gathering primary data for 4 hours at the traffic peak hours. From the calculation, the case of DharmawangsaStreet, Surabaya, showed that the critical gap is about 3,55 seconds. The observation from 07.00-11.00 a.m.showed that the possibilities of crossing the road respectively are: 45, 55, 56, and 60. Compared to the numberpedestrians crossing the road, the research showed about 71, 24, 33, and 49 peoples. In this case, the possibility ofcrossing the street at 07.00-08.00 a.m. cannot be fulfilled. Meanwhile, the possibility to cross the street with safelyat 08.00-11.00 a.m. can be fulfilled. Therefore, the use of midblock crosses is still relevant.

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.

AnAlysis of The effecT of fiscAl sTimulus Policy of infrAsTrucTure To The economy of indonesiA (sociAl AccounTing mATrix APProAch) Hendro Ratnanto
Widyariset Vol 14, No 1 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

The focus of this research is to determine the effect of fiscal stimulus policy of infrastructure to the economyof Indonesia. Research method used is Social Accounting Matrix (SAM). The simulation result indicates that fiscalstimulus policy of infrastructure has a positive effect to the revenue growth of production factors, households,and production activities. Fiscal stimulus also affect the growth of other sectors outside the infrastructure sector,including mining and quarrying, forestry, and timber industry. Based on a structural path analysis it can beconcluded that the global effect of the infrastructure sector to household is carried out through the productionfactors labour and capital.

LEGAL PROTECTION FOR VICTIMS OF ADULTERY Budi Suhariyanto
Widyariset Vol 15, No 1 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

Adultery set in the KUHP has a weakness in defining act of adultery which is different from the living law.There are individual victims and community who have no legal protection. Therefore, legal protection for victimsof adultery is necessary. This research is a normative legal research with normative juridical approach. The dataused are secondary data which were analyzed using qualitative methods of juridical analysis. The results of thisstudy concluded that legal protection for victims of adultery can be done through legal discovery by a judge orthrough criminalization policy accommodating the living law.Keywords: Protection, Victims, Adultery.

FORMULATION OF CHITOSAN MEMBRANE COMPOSITION AND STIRRING OPTIMIZATION FOR REDUCING TOTAL SOLID OF PALM OIL MILL EFFLUENT Sri Wahyuni; Siswanto Siswanto; Soekarno Miswana Putra
Widyariset Vol 3, No 1 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

Palm oil mill effluent (POME) is palm oil industry wastewater with high solid content. Waste filtration using chitosan membrane has been investigated to decrease the solid waste, but the final value does not meet the quality standards. Therefore, further development on formulation and optimization of the membrane manufacturing process (composition and stirring speed) are needed. The purpose of this study was to determine the effect of composition and stiring speed on the performance of the membrane in decreasing solid content of POME. Chitosan membrane was prepared by phase inversion method with two supporting materials, namely Poly Ethylene Glycol (PEG) and Poly Vinyl Alcohol (PVA). The variables of this experiment were Chitosan:PVA ratio (40:60, 45:55, 50:50, 55:45 and 60:40 (v/v)) and stiring speed (200 rpm and 250 rpm). Chitosan composite membrane was tested in a cross flow reactor system. The result showed that the highest rejection values of TSS and TDS generated by the membrane on the chitosan and PVA ratio of 50:50 (v: v) at agitation speed of 250 rpm were 96.84% and 97.23%, respectively.

THE ABNORMALITY MORPHOLOGY OF Namalycastis (POLYCHAETA: NEREIDIDAE) FROM JAKARTA BAY AND ESTUARY WAY BELAU LAMPUNG Sevi Sawestri
Widyariset Vol 16, No 3 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Namalycastis (Polychaetes: Nereididae) lives in estuarine that can be used as polluted bioindicators. Morphological abnormalities in some Polychaeta members have been found previously, whereas the abnormality Namalycastis from Indonesia has never been recorded. The aim of this research was to study the abnormality morphology of Namalycastis form Jakarta Bay (polluted sediment) and estuary Way Belau-Lampung (unpolluted sediment). There were two species of Namalycastis in both locations, i.e. N. abiuma and N. cf borealis. The abnormality of Namalycastis collection from both locations consist of five structures i.e. on antenna appendages, eyes, tentacular cirri, parapodia, and setae. The abnormality of Namalycastis collection from Jakarta Bay was higher than from Way Belau. The abnormality of parapodia and setae in this research might had resulted from the influence of polluted habitat conditions.

PERAMALAN HARGA PARITAS KEDELAI MODEL ANFIS Azis Muslim
Widyariset Vol 17, No 1 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

The aim of this research is to compare the accuracy of the ARMA conventional model and the ANFIS softcomputing model in forecasting soybean parity price. Two variables are chosen, Rupiah exchange rate and international soybean price which are the most volatile than others that make up the parity price. The methods used to compare the two models are Theil’s Inequality and MAPE. The results show that the ANFIS models are superior in predicting the exchange rate and international soybean prices based on the selected performance method.

PERFORMANCE DIAGNOSIS OF SEPTAGE TREATMENT PLANT Reni Nuraeni; Fitrijani Anggraini
Widyariset Vol 1, No 1 (2015): Widyariset
Publisher : Pusbindiklat - LIPI

The sanitation development target that everybody has access to sanitation infrastructure has not fulfilled yet, and only 65% of 146 units of septage treatment plant operated well. These conditions need to be improved and the first thing to do is analysing existing condition and composing scientific information as a reference for implementation. The aim of this research is to map the condition and management status of septage treatment plant system in 8 cities selected. This research was conducted by assessing the content of septage treatment technologies using technology atlas approach, which consists of elements technoware, humanware, infoware and orgaware. Mapping carried out on two types of septage treatment plant, that uses Imhoff tank and Anaerobic Baffle Reactor (ABR). Mapping was also conducted on the status of rehabilitation and operational conditions for each septage treatment plant.The results of this study concluded that the sophistication level of septage treatment technology is a medium category with coefficient contribution is 50%. Operational conditions of septage treatment plant is almost optimum with the ability of septage processing is 54%. A recommendation to increase the performance of septage treatment plant are : improving septage supply, improving the maintenance quality of processing units, improving SOP quality, sharpening tasks and responsibilities as well as improving human resource competencies.

Page 30 of 48 | Total Record : 476

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Andri Rahman

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andri.agus.rahman@lipi.go.id

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Pusbindiklat LIPI, Jl. Raya Bogor Km. 46, Cibinong Science Center, Cibinong - Bogor 16911

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Jawa barat

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