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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 25 Documents

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Search results for , issue "Vol 14, No 3 (2011): Widyariset" : 25 Documents clear

INFLUENCES OF METEOROLOGICAL PARAMETERS AND OZONE PRECURSORS TO NEURAL NETWORK MODEL IN OZONE TROPOSPHERIC CONCENTRATION (STUDY IN BANDUNG CITY) Dyah Lukita Sari; R. Driejana
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

As an air pollutant, the fate of ozone is determined by the movement and chemistry of atmospheric dynamics and the precursors of ozone are emitted from the source. In that case the effect of each of meteorological param- eters and ozone precursors need to be known so that the ozone concentration can be predicted. In this research the concentration of ozone precursors (NO and NO2), temperature, solar global radiation, humidity, and wind speed as meteorology parameters were used as input in artifi cial neural network program to obtain model which can predict concentration of tropospheric ozone in Bandung city. The relation between ozone precursors concentration and meteorological parameters to ozone concentration was indicated by the correlation value. Positive correlation values, the increase in ozone concentration, was infl uenced by variables of temperature and solar radiation. A negative correlation value, the decline in ozone concentration, is affected by humidity variables. Modelling results indicate that the use of temperature and concentrations NO2 as data input appeared to be a dominant contributors rather than the other input parameters.

THE IMPACT OF TIMBER HARVESTING AND TPTJ (SELECTED LOGGING AND ROW PLANTING) SILVICULTURE SYSTEM ON SOIL CARBON CONTENT POTENCY IN TROPICAL FORESTS (CASE STUDY IN IUPHHK AREAS OF PT SARI BUMI KUSUMA CENTRAL KALIMANTAN) Almulqu A.A, Elias; Prijanto Pamoengkas
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Timber harvesting and TPTJ silvicultural treatment had signifi cant impact on carbon stocks in tropical natural forests. The objectives of this research were studying the impact of timber harvesting and TPTJ silvicul-tural system on carbon stock potency in the soil of tropical natural forests, and examining the characteristics of soil physical, chemical and biological properties in tropical natural forest and TPTJ logged over areas. This research was conducted in the IUPHHK of PT Sari Bumi Kusuma, Unit of Seruyan, Central Kalimantan province. Carbon stocks potency in the soil were measured in litter biomass, root biomass, and soil organic carbon, by using Brown equation (1997), where it was assumed that 50% of the biomass was carbon. Research results showed that wood harvesting and TPTJ treatment possessed signifi cant respond. Carbon stocks in TPTJ areas ranged between 93.3583–135.9631 tons of Carbon/ha, whereas carbon stock in primery forest was 122.7342 tons of Carbon/ha

PREPARATION OF NI-MO CATALYSTS USING THE PILLARED CLAY AS A SUPPORT FOR HYDRODESULFURIZATION OF COKER NAPHTHA Nino Rinaldi
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

On the preparation of the Ni-Mo catalysts, a high of surface area of the support was needed in order to achieve the well dispersion of Mo on the support. One of the promising ways is the use of pillared clays as the support. Therefore, the preparation of pillared clay for a support of Ni-Mo catalyst and its effect on the hydrodesulfurization (HDS) reaction for sulfur removal of Coker naphtha were studied. The effects of pH of the Mo impregnation solutions were also studied. The results show that the pillarization process on clay using Al-pillared is signiﬁ cantly increased the surface area. Moreover, with the pH of the impregnation solution of 10, Mo is higher dispersed on the pillared clay support compared to pH-1, and thus the HDS activity of NiMo pillared clay catalyst of pH-10 is also more active. However, the HDS activity of the present catalysts is still not good enough compared to the commercial NiMo catalyst.

INDONESIAN GINGER YIELD QUALITY AS THE BASIS FOR SALEABILITY OF GINGER OIL ON THE INTERNATIONAL MARKET Wahyu Susihono
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Ginger Rhizome is potential to be sold in form of ginger oil. The distillation process was needed to fi nd out the most profi table ginger to be sold in form of ginger oil. The research objectives are to fi nd out comparison of “rendemen” from rind and fl esh of gajah, emprit, and red ginger using water and steam distillation process with capacity: 5000 gram of raw materials. Characteristic test performed to fi nd out the feasibility of sales accordance with Essential Oil Association Standard. Result showed that the highest rendemen is red ginger rind: 1,102%, while the lowest is gajah ginger fl esh: 0,248%. Gajah ginger oil is not feasible to be sold in world market because of it soaping number that reached 25.52%.

STUDY OF ADAPTATION SIMULATION ON TERMAL COMFORT- ABLENESS LEVEL CAUSED BY GLOBAL CLIMATE CHANGE ON PADANG Sugeng Nugroho
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Climate change will affect the thermal comfortableness level in the urban area therefore adaptation is needed to reduce its impact. Thermal comfortableness level was determined base on climate scenario data emission A2 and B2 on the period of 1961-2100. Adaptation simulation is conducted by modifying mean radiant temperature, increasing wind speed and cloth coeffi cient value on the thermal comfortableness level calculation. Result showed that generally, thermal comfortableness level in Padang on the period of 1961-2100 was in the uncomfort level category. Adaptation simulation which had the most infl uence on the thermal comfortableness level was by modify-ing mean radiant temperature and increasing wind speed on the original data.

QOMARIAH MONTHS EARLIER DEFINITION IN INDONESIA UNDER THE SUPERVISION OF DATA HILAL BMKG Rukmana Nugraha
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Hilal observations was conducted from October 2008 to April 2010 using a telescope and electronic detec-tor. The data obtained were analyzed based on the measurement and the calculation of delta azimuth, arc of vision, arc of light, age and lag time stated at best time for observed Hilal or at sunset/sunrise for unobserved Hilal. For delta azimuth 0o, Hilal can be observed if arc of vision was greater than 8,95o, arc of light was greater than 8,33o, age more than 12,08 hour after/before conjunction and lag was longer than 28,97 minutes. Based on these criteria, Ramadhan, Shawal, and Dhulhijjah 1431 H will begin on 12 August 2010, 10September 2010, and 8November 2010, respectively.

MICROHABITATS OF Hylarana chalconota ALONG FAST FLOWING WATER STREAMS IN DEGRADED LAND IN GUNUNG SALAK FOOT HILL Hellen Kurniati; Alex Sumadijaya
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

This research was conducted to determine the microhabitat selection in the frog species Hylarana chalco-nota in fl owing aquatic habitats situated in degraded land. Three survey sites (river, ditch, pine plantation) were selected in the Curug Nangka area on the slopes of Gunung Salak at an altitude between 630–740 m above sea level. Transect methodology was used to determine the microhabitat preference in H. chalconota. Two ways paired and one-way ANOVA were used to test the impact of environmental factors on the microhabitat preference of H. chalconota. A signifi cant effect of air humidity on the presence of individual frog in the river and pine plantations was observed, but other environmental factors (air temperature, water temperature, air humidity, moon phase) had no signifi cant effect on individual H. chalconota along the ditch irrigation. In selecting microhabitats, the frog prefers vegetation below the substrate. However, frogs did not select specifi c plant species;preference appears to be related to the nature of the leaf and petiole strength. In horizontal microhabitat selection, individual frog tend to choose a distance between 0-1 meters from the edge of a river or ditch, while in vertical microhabitat selection, individual H. chalconota tend to choose a distance between 0–1 m from the ground.

THE ASSESSMENT OF THREE PROCESS AREAS IN MATURITY LEVEL 2 CMMI-DEV 1.2 FRAMEWORK ON SMALL INDEPENDENT SOFTWARE VENDOR IN INDONESIA (CASE STUDY: INOVASIA) Kautsarina Kautsarina
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

This research was conducted to get a snapshot of the utilization of the Capability Maturity Model Integration (CMMI) framework in a small ISV, with Inovasia as a case study, by assessing three process areas of level 2 as a ﬁ rst step in achieving software development activities in a timely, meets the needs of users, and within the budget provided. Software process improvement implemented in CMMI for Development model version 1.2 by using Management Information System Interim Maturity Evaluation (MISIME) as a tool to diagnose the maturity level of an ISV. This study generated value of current maturity level of ISV and software process improvement recom-mendations that can be done by the ISV.

THE PROPERTIES KRAFT PULP SENGON WOOD (Paraserianthes falcataria):Differences Of Cooking Liquor Concentration and Bleaching Sequence Widya Fatriasari; Lucky Risanto
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

The research was to investigate the difference effect of cooking liquor concentration and bleaching sequence on the properties Kraft pulp sengon wood (Paraserianthes falcataria). The Kraft pulp conditions were alkalinity (16 and 20%) and sulfi dity (20 and 25%). The maximum pulping temperature was 170°C for 4 hours, Liquor to wood ratio of 4:1 and 100 gram OD. Pulp bleaching sequences were P1 DEP2 and D1ED2P. Utilization of selected Kraft pulping was effective enough for dissolving lignin. The highest and the lowest lignin decreasing were 90% and 61% respectively. The increasing effect of alkali concentration was more dominant than its sulfi dity on the pulp delignifi cation selectivity. Generally, the optimum Kraft pulping conditions were alkalinity 20% and sulfi dity 25%. The sequence bleaching difference of the selected pulp tended on the decreasing of kappa number and pulp yield. The fi rst pulp bleaching method (P1EDP2) was relatively better than the second method (D1ED2P)

THE POTENTIAL YIELD OF THREE NEW PADDY VARIETIES AT KEBON AGUNG – BANTUL Setyorini Widyayanti; Kristamtini Kristamtini; Sutarno Sutarno
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Food needs will increase every year due to population growth and changing patterns of food consumption, so it needs a good cultivation technology to increase the productivity and national food production. Some efforts have been done including the use of paddy new varieties (VUB). The purpose of this research was to investigate the yield of three new varieties of paddy rice fi eld in Imogiri, Bantul, Yogyakarta Province. The experiment was carried out in Jayan village, Kebon Agung, Imogiri, Bantul, Yogyakarta from August to November 2009. The experiment was arranged in a randomized block design with three new varieties of Inpari 1, Conde and Dodokan as treatments. Each treatment had three replicates and conducted in the total area of 3,000 m2. The results showed that Inpari 1 had the highest dry harvested grain crops (11.64 t / ha GKP), followed by Conde (11.28 t / ha GKP) and Dodokan (9.47 t / ha GKP), respectively.

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Contact Name
-

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-

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Journal Mail Official
widyariset@mail.lipi.go.id

Editorial Address
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