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All Journal Indonesian Journal of Forestry Research Jurnal Nusa Sylva Agrisintech (Journal of Agribusiness and Agrotechnology)
Sigit Baktya Prabawa, Sigit Baktya
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Agriculture, Biological Sciences & Forestry

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COUPLING AGENT EFFECT ON THE TENSILE STRENGTH PROPERTIES OF SISAL FIBER-PLASTIC COMPOSITES Prabawa, Sigit Baktya
Indonesian Journal of Forestry Research Vol 2, No 2 (2005): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2005.2.2.99-106

Abstract

The fiber-plastic composites were made from the compounding of plastic (polypropylene) and sisal  (Agave sisalana)fiber with or without  addition of coupling agent (Maleic anhydride grafted polypropylene).  The tensile  strength (Modulus of Elasticity-MOE, Modulus of Rupture-MOR) of the composites were evaluated in the three different conditions, i.e. air dry condition (control), 24 - hour immersion in cold water and 2-hour immersion  in boilingwater.  The results showed that the addition of coupling agent enhanced the properties of the composites.   These properties did not significantly change although  the composites  were immersed in cold water as long as 24 hours.    However, immersion in boiling water for 2 hours, tended to decrease MOR and MOE of the composites.
KOMPONEN KIMIA KAYU EKALIPTUS (Eucalyptus Urophylla S.T. Blake) HASIL PENJARANGAN DAN ALTERNATIF KEGUNAANNYA Prabawa, Sigit Baktya
Jurnal Nusa Sylva Vol. 17 No. 1 (2017): JURNAL NUSA SYLVA
Publisher : Universitas Nusa Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (224.684 KB) | DOI: 10.31938/jns.v17i1.197

Abstract

Eucalyptus urophylla S.T. Blake in Indonesia is known as Eucalyptus, Popo, Ampupu and in abroad known as Timor white gum and Timor mountain gum. This species is native to Indonesia whose natural distribution includes Adonara, Alor, Flores, Lembata, Pantar, Timor, Wetar and Lombok. In Indonesia this species is recommended for Industrial Plantation Forests (IPF). In IPF activities, thinning is one of the important stages of activities to be carried out. The purpose of this study is to present technical information about the chemical components of thinning Eucalyptus plants which are around 4 years old in relation to their possible use. The results of this study showed that the extractive content of Eucalyptus wood dissolved in cold water, hot water, 1% NaOH and alcohol-benzene were 10.14%, 15.66%, 24.34% and 3.81% respectively. The content of lignin, hemicellulose, cellulose and holocellulose were 22.53%, 26.86%, 56.97% and 83.83% respectively. The difference in the position of the stem influences its extractive content where the higher position of thestem the lower the extractive content. This species is very suitable for pulping materials, both mechanical pulp, semi-chemical pulp and chemical pulp. In pulp and paper making, it is expected that this species would  save the use of cooking chemicals or bleaching materials, resulting in high pulp yields and creating a good bond between fibers in the pulp or paper sheet. In the manufacture of particle boards, it is expected that this species would not become problems in resin hardening, internal breakage of the board due to volatile extractive internal gas pressure or dimensional stability. But this species is not suitable for cement boards. Keywords : Eucalyptus urophylla, Eucalyptus, Thining activity, IPF, Wood chemical component
TEKNIK PEMBUATAN PUPUK ORGANIK DARI LIMBAH PADAT INDUSTRI MDF Prabawa, Sigit Baktya
Jurnal Nusa Sylva Vol. 17 No. 2 (2017): JURNAL NUSA SYLVA
Publisher : Universitas Nusa Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (193.729 KB) | DOI: 10.31938/jns.v17i2.203

Abstract

 Woody waste from logging activities and the wood processing industry is quite large. If this waste is not utilized, it will cause considerable losses due to wasted woody waste. In Indonesia there are many wood processing industries including the pulp and paper industry, plywood, molding, and medium density fiberboard (MDF). In the MDF industry, chipping are the activities that must be carried out. However, this chipping activity leaves considerable waste in the form of fine chips. Related to this, it is necessary to find and get the use of organic solid waste into a product that can provide added value and technology that can be applied by the communities. One solusion to this is probably by utilizing the waste into organic fertilizer. The aim of this study was to obtain information and technology for making organic fertilizers from the MDF's organic solid waste industry. Fine chip samples were taken from the MDF industry using raw materials from acacia mangium and gmelina, located in Senoni, Kutai Kartanegara Regency, East Kalimantan Province. Organic fertilizer was made by composting using EM-4 microbial consurtium with rice straw and chicken manure additives. The results of the study show that technically the composting of MDF solid waste can be done well. The composting process to mature takes about 4 months. Composting reduces the C element content of MDF waste from around 56% to 25%, and decreases the value of C/N ratio from 347 to around 28. Composting increases the N element more than 5 times, and also increases the content of K elements. Adding rice straw and chicken manure in general it tended to decrease the value of the C/N ratio, increase pH, and increase the levels of elements P, K, Ca and Mg and their cation exchange capacity. The addition of these materials generally made compost meet SNI standards except the compost water content.
TEKNIK PELENGKUNGAN KOMPONEN KAPAL KAYU SECARA TRADISIONAL DI BATULICIN KALIMANTAN SELATAN Prabawa, Sigit Baktya
Jurnal Nusa Sylva Vol. 18 No. 1 (2018): JURNAL NUSA SYLVA
Publisher : Universitas Nusa Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (184.87 KB) | DOI: 10.31938/jns.v18i1.210

Abstract

Indonesia is an archipelago, within the islands themselves there are many rivers. To connect between one island or location to another, our ancestors have used wooden boats long ago. For income earning, the fishermen use also this wooden ship. Therefore, it is not surprising that since ancient times Indonesian people have been very familiar with what wooden boats are, including how to make these wooden ships and also how to choose wood suitable for the wooden ship. They commonly choose the wood available in their surrounding area. Batulicin is an area located on the southeastern coast of South Kalimantan province where many people make wooden boats such as fishing boats and cargo or passenger ships. The objective of this study was to describe how the Batulicin’s community made a curvature of the components of wooden vessels as well as  informing the types of wood used for making wooden vessels. The result of this study showed that the wood for ship components were ulin, halaban and bungur. Although the selection of wood species was traditionally carried out, however these wood are still meet with the SNI standards requrenment as well as the rules of Indonesian Wooden Ship Construction. The curved components of the shipbuilding were found on the boat skin, boat ribs, boat ‘senta’ and on the propellers holder. The curvature techniques used by the community include by heating the wood and bending it, by force through dragging using a pulley and by utilizing the natural curvature of curved plant parts such as branches, roots or natural bent wooden stems. Although the wood bending technique done traditionally without pre-treatment, the wood from the curvature did not crack or break. In developing wood bending techniques for the community, it is recommended to find a bending technique with a preliminary treatment that is relatively inexpensive and easy to apply by the community.
EFEKTIFITAS PENGAWET NABATI DARI TUBA (Derris Elliptica BENTH.) MELALUI EKSTRAKSI PADA TITIK DIDIH PELARUTNYA YANG DIAPLIKASIKAN PADA BEBAK GEWANG Prabawa, Sigit Baktya
Jurnal Nusa Sylva Vol. 18 No. 2 (2018): JURNAL NUSA SYLVA
Publisher : Universitas Nusa Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (261.938 KB) | DOI: 10.31938/jns.v18i2.221

Abstract

In East Nusa Tenggara (NTT) area there are many Gewang trees (Corypha utan LAMK.). Many people in NTT use Gewang midrib as components of home buildings such as walls and ceilings. But the building components of the Gewang midribs contain ingredients that have the potential to be attacked by organisms such as termites. To overcome this, preservation action is needed. On the other hand there are several types of toxic forest flora that are recommended as sources of vegetable preservatives including Tuba (Derris elliptica BENTH.). Meanwhile, there has not been much research on preservation for gewang midribs. Therefore this study aims to determine the effectiveness of vegetable preservatives from Tuba for preservation of Gewang midribs through extraction at the temperature of the boiling point of the solvent. Extraction of Tuba plants was carried out using a solvent of Acetone, Methanol and Water each at the boiling point temperature for 1 hour in a ratio of 1: 8. The results showed that through GCMS analysis and preservative effectiveness testing through soil termite tests indicated that the extraction method used in this study resulted in no sufficient amount of active ingredients to be used as vegetable preservatives or able to preserve gewang midribs. The results of this study recommended that in order to obtain active ingredients from Tuba plant extracts as vegetable preservatives to preserve gewang midribs, it is not recommended to extract these plants using extraction methods as was done in this study. Instead, to obtain active ingredients from Tuba plant extracts, it is recommended to try to extract using methanol at room temperature for 72 hours in a ratio of 1: 5.
Produk Biji Kelor Pada Tanaman Kelor Umur Tujuh Tahun Dari Kabupaten Timor Tengah Utara (TTU) Nusa Tenggara Timur (NTT) Prabawa, Sigit Baktya
Agrisintech (Journal of Agribusiness and Agrotechnology) Vol 2 No 2 (2021): Oktober
Publisher : Universitas Nusa Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31938/agrisintech.v2i2.369

Abstract

ABSTRAK  Kelor tumbuh alami di pegunungan Himalaya, lalu diintroduksi ke berbagai wilayah lain termasuk Indonesia. Di Indonesia khususnya di NTT, jenis ini tumbuh di berbagai pulau. Masyarakat NTT umumnya mengambil daunnya untuk sayur, sedangkan bijinya belum banyak dimanfaatkan. Biji Kelor mengandung bahan yang baik untuk kesehatan, kecantikan, pemurnian air, maupun untuk bahan bakar dan sebagainya. Kandungan minyaknya bisa mencapai 35-40%. Karena itu biji Kelor memiliki potensi atau peluang untuk dapat dijual atau memiliki nilai ekonomi yang dapat dikembangkan guna meningkatkan pendapatan masyarakat di NTT. Dalam memanfaatkan biji kelor di NTT, satu diantara informasi yang diperlukan antara lain informasi terkait kuantitas atau produktivitas bijinya yang dihasilkan oleh pohon kelor yang tumbuh di NTT yang mana hal ini akan berguna dalam mengkalkulasi atau mengestimasi produk biji kelor yang akan dihasilkan agar kesinambungan produksi dapat diupayakan. Penelitian bertujuan mengestimasi produk biji kelor yang dihasilkan oleh tanaman kelor berumur 7 tahun dari Kabupaten TTU. Pendekatan dilakukan dengan mengambil 10 pohon contoh kelor secara acak, memanen biji kelor, menghitung polong dan biji kelor, menimbang biji kelor dan sebagainya. Hasil penelitian memperkirakan bahwa dalam 1 hektaree tanaman kelor berumur 7 tahun dengan asumsi jarak tanam 5x5 meter diperkirakan akan di hasil biji sebanyak 13,84-298 kg (biji berkulit) atau sebanyak 11,07-229,48 kg biji tanpa kulit. Dari biji ini diperkirakan akan menghasilkan minyak kelor sebanyak 4,41-108,71 liter minyak kelor yang setara dengan 11-271,78 juta rupiah per tahun.   ABSTRACT   Moringa grows naturally in the Himalayas, then it was introduced to various other regions including Indonesia. In Indonesia, especially in NTT, this species grows on various islands. The people of NTT generally take the leaves for vegetables, while the seeds have not been widely used. Moringa seeds contain ingredients that are good for health, beauty, water purification, as well as for fuel and so on. The oil content can reach 35-40%. Therefore, Moringa seeds have the potential or opportunity to be sold or have economic value that can be developed to increase people's income in NTT. In utilizing Moringa seeds in NTT, one of the information needed includes information related to the quantity or productivity of the seeds produced by Moringa trees growing in NTT which will be useful in calculating or estimating the Moringa seed product that will be produced so that production continuity can be pursued. . This study aims to estimate the product of Moringa seeds produced by 7 years old Moringa plants from TTU Regency. The approach was taken by taking 10 samples of Moringa trees at random, harvesting Moringa seeds, counting Moringa pods and seeds, weighing Moringa seeds and so on. The results of the study estimated that in 1 hectare of 7 years old Moringa plants assuming a spacing of 5x5 meters, it is estimated that 13.84-298 kg of seeds will be produced (skinned seeds) or 11.07-229.48 kg of seeds without skins. From this seed, it is estimated that 4.41-108.71 liters of Moringa oil will be produced, which is equivalent to 11-271.78 million rupiahs per year.
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