Jurnal TENGKAWANG
Not a member yet
119 research outputs found
Sort by
SIFAT PAPAN SEMEN PARTIKEL KAYU KARET (Cement Board Property of Rubber Wood Particle)
Full text linkAim of the study was to assess the suitability of rubber wood particles in the production of cement boards. This research was conducted at the woodworkshop of the Forestry Faculty of province Tanjungpura University and the Government Polytechnic Laboratory of Pontianak. Factors examined include the use of particles of different size, namely rough particle (a1), medium particle (a2) and soft particle (a3), and using different cement qualities namely 100 % ( b1), 125 % ( b2) and 150 % ( b3). The properties of cement board particles tested included the physic properties (water quality and density) and mechanic properties (firmness of static refraction (MOR) and thickness reduction caused by 3 kg / cm surface pressure). The test result were compared to the standard of DIN 1101. The gathered data were analyzed using the factorial trial method with complete random model (RAL) and 3 (three) repetitions. The best results were adieved by combining soft particles with 150 % cement quality. The use of roughs Particles and 125 % cement quality produced the best density value. while the use of soft particles and 150 % cement quality produced best results regarding water quality, firmness of static refraction (MOR) and thickness reduction caused by 3 kg / cm surface pressure. Keywords: Rubber wood, Size Particle, cement quality, cement board particl
PENINGKATAN MUTU KAYU JATI (Tectona grandis) HASIL PENJARANGAN ASAL KABUPATEN CIANJUR
Full text linkTeakwood is one of the favourite wood due to its strength, durable and beauty. The quality of teakwood was influenced by plantation site, season and geographic. This study attempts to expose some characteristic of teakwood which is produced from thinning plantation with 1 and 2 hours heat treatments at 170oC also densification 17% and 25% at the same temperature. The result shows that both heat and densification treatments increase the hardness value of teakwood surface. The higroscopisity of teakwood is also increased after heat treatment. On the contrary, the treatment has not influence to the density of teakwood. The colour of teakwood is darker after 1 hour heat treatment. The anatomy character of teakwood is appear being flat due to the pressing process. Key words: Teakwood, spacing plantation, heat treatment, densificatio
PENGGUNAAN ASAP CAIR DARI TANDAN KOSONG KELAPA SAWIT (TKKS) DALAM PENEKANAN PERKEMBANGAN JAMUR SCHIZOPYLLUM COMMUNE (The use of liquid smoke from empty fruit stalks of oil palm in suppressing the fungus-growth of Schizophyllum commune Fries)
Full text linkThe aim of this research was to evaluate the activity of liquid smoke from empty fruit stalks of oil palm to the Schizophyllum commune Fries fungus. Research was conducted in several steps, i.e. pyrolisis of liquid smoke and efficacy test of liquid smoke as antifungal. Agar media used was PDA (potatoes dextrose agar). Concentration of liquid smoke used for the treatment were 0; 0.25%; 0.50%; 0.75%; 1.00%; 1.25%; and 1.50% (v/v). The results indicated that the liquid smoke inhibited the Schizophyllum commune fungi growth. Concentration of liquid smoke resulted in significantly different antifungal activities. Liquid smoke with a concentration of 1% resulted in an average value of antifungal activity of 95.12%. The contents of organic fractions of liquid smoke, such as acid and phenol might be responsible for these antifungal activities. Keywords : liquid smoke, oil palm, empty fruit stalks, antifungal activity, Schizophyllum commun
BIOAKTIVITAS ZAT EKSTRAKTIF KULIT Acacia auriculiformis A. Cunn. ex Benth. TERHADAP RAYAP TANAH (Coptotermes curvignathus Holmgren)
Full text linkThis research was undertaken mainly to isolate and identify antitermitic substances that may be prospective as wood natural preservative from the bark of Acacia auriculiformis A. Cunn. ex Benth. The woodmeal of the samples were extracted with acetone. The acetone extract was then fractionated into n-hexane soluble fraction, ethyl ether soluble fraction, ethyl acetate soluble fraction, and insoluble fraction. The antifeedant bioassay test was carried out by treating paper discs with extracts at six level of concentration i.e. 0%, 2%, 4%, 6%, 8%, and 10% (w/w). The bioassay test revealed that ethyl ether soluble fraction exhibited high toxicity to subterranean termite Coptotermes curvignathus Holmgren (concentration of 4% has been indicated very strong activity). Keywords: Bioactivity, extractives, Acacia auriculiformis, termites, Coptotermes curvignathu
KADAR AIR DAN STABILITAS DIMENSI BERDASARKAN SUHU PENGERINGAN DAN JENIS KAYU (Moisture Content and Dimension Stability Based on the Temperature of Dry Kiln and Wood Types)
Full text linkWood drying is a process to remove water from the wood to stabilize the dimension. The research was to determine the level of dimension stability of wood in dependence of drying temperature and type of wood (Tectona grandis L.f and Paraserianthes falcataria L) for temperature drying there are three standard treatments: 50C, 70C and 90C. The parameter measured in this research is the dimensional stability of wood. Results show that the type of wood has a strong effect on stability dimension, while the dryng temperature and the interaction of both factors had no effect. Paraserianthes falcataria L wood best indicates the level of dimensional stability, with a mean value of depreciation ratio T/R of 0.99. The dimensional stability of Tectona grandis L.f, had a mean value of T/R 1.64 for T/R . Average wood density values in this study for Tectona grandis L.f was 0,65 g/cm3 and Paraserianthes falcataria L 0.42 g/cm3. The same type of wood from outside of West Kalimantan had a density equal the value of 0.67 g/cm3 and 0.33 g/cm3. This indicates that the origin of the timber had no effect on density and dimensional changes of the wood Key word: Moisture content, dimension, temperatur of the dry klin, wood typ
KUALITAS BIBIT RAMIN (Gonystylus bancanus (Miq). Kurz) UNTUK PENANAMAN PENGAYAAN AREAL BEKAS TEBANGAN (Ramin (Gonystylus bancanus (Miq). Kurz) seedling quality for enrichment planting of logged over area)
Full text linkEnrichment planting in logged-over area needs high-quality seedlings that have high competitiveness, when planted around or near to other plants that grow naturally. The aim of this study is to find techniques to produce high-quality ramin seedlings. The studie employr the following experimental methods : 1) split plot in time to study the arbuscular mycorrhizal fungi (AMF) colonization in roots of natural regeneration of ramin, 2) completely randomized design to study the growth of ramin seedlings in the nursery, 3) randomized block design to study plant growth of ramin at logged-over area. The results show that AMF colonization in the root of ramin seedlings taken from the field was highest at medium light intensity. Meanwhile, the optimum light intensity to raise mycorrhizal seedlings in the nursery is 55 % to 75 %. The AMF colonization increased height and diameter growth, fresh and dry weights, macro-nutrients absorption, dependency of P uptake (DPU), shoot-root ratio quality and index of ramin seedling in the nursery. Ramin is highly dependent on AMF having a relative mycorrhizal dependency (RMD) of more than 50 % and percent growth relative (PGR) of more than 100 %. Rock phosphate of 50 g/polybag is sufficient to support the growth of mycorrhizal seedlings in the nursery. The AMF colonization increases height and diameter of ramin seedlings after being planted in the field (logged-over area). It could be concluded that high quality ramin seedlings could be produced by inoculation of AMF under optimum light intensity and optimum dosage of rock phosphate.Key words : ramin (G. bancanus), light intensity, arbuscular mychorrhizal fungi (AMF), rock phosphat
PENGARUH STRUKTUR VEGETASI TERHADAP KELIMPAHAN KERANG BAKAU (Polymesoda erosaLightfoot 1786) PADA MUSIM KEMARAU DI KAWASAN HUTAN MANGROVE SEGARAANAKAN CILACAP
Full text linkThe aim of this research is to analysis the effect of vegetation structure on abundance of mangrove clam (Polymesoda erosa Lightfoot 1786) at dry season in mangrove forest of Segaraanakan Cilacap. This forest has a degradation area from 17.090 hectare to 9.272 hectare because of illegal logging on mangrove vegetation. The degradation of mangrove vegetation will cause on degradation on mangrove clams. Method of the research was stratified purposive sampling based on mangrove. vegetation The results of research showed that from cubic regression analysis the mangrove saplings vegetations has no effect onthe abundance of mangrove clams, vice versa, the mangrove seedlings has an effect onthe abundance of mangrove clams. Bio-environment analysis results indicate that mangrove seedlings which influence to mangrove clams abundance were Acanthu sebrateatus, Avicennia marina, Acrostimum speciosum and Sonneratia alba. Keywords: abundance, mangrove clam, structure vegetation Segaraanakan Cilacap
POTENSI EKSTRAK DARI LIMBAH KULIT KAYU DAN BATANG MURBEI (Morus alba var. kanva) SEBAGAI ANTIBAKTERI Enterococcus faecalis ATCC 29212
Full text linkThere are several species of mulberry that grow and cultivated in Indonesia, and Morus alba var. kanva is one of it. The leaves of mulberry are used as silkworm feeds, while the bark and stem as waste are not utilized. This study aims to analyze the potency of bark and stem of mulberry as an antibacterial Enterococcus faecalis (E. faecalis) which is a cause of the infection of teeth root canal. The bark and stem of mulberry were measured it water contents then macerated with ethanol and the percentage of yield extracts were determined. Furthermore, anti-bacterial activites were conducted with 5 level concentrations of bark and stem extract (25; 50; 75 and 100 mg / mL), ethanol and Tetracycline 250 mg as negative and positive control. The results showed that the bark had a moisture content of 10.7% with a yield value of 25.5%, while the stem had a moisture content of 9.4% and a yield value of 9.8%. the optimum concentration is at the level of 75 mg / mL because at this concentration it has been able to inhibit the inhibitory zone value which is no different from 100 mg / mL
PENGARUH KEWIRAUSAHAAN KORPORASI PADA KINERJA EKSPOR PABRIK CRUMB RUBBER PT. SUMBER DJANTIN PONTIANAK
Full text linkCorporate entrepreneurship is one of the main important factors that can determine the progress or decline of a company. The purpose of this study the authors do is to know about the Effect Analysis Corporate Entrepreneurship (Innovation, Proactive, and Risk) of the Export Performance Company in crumb rubber processing factory PT. Sumber Djantin Pontianak. Research methods used to assess corporate entrepreneurship developed by Covin & Slevin models with multiple linear regression analysis method. Results of multiple linear regression analysis showed that the Corporate Entrepreneurship (X) positive and significant impact on Export Performance Company (Y) on crumb rubber processing factory PT. Sumber Djantin Pontianak, the regression equation: Export Performance = -5.421 + 0.868 Innovation + 1.158 Proactive + 0.395 willingness take Risks. Recommended for future research include other relevant variables impact on the success of the company Export Performance crumb rubber processing plant. And expand the use of new theories, so that research results can be generalized. Keywords: corporate entrepreneurship, export performance, and crumb rubber factor
BIOAKTIVITAS ASAP CAIR KULIT BUAH DURIAN SEBAGAI BAHAN PENGAWET PAPAN PARTIKEL Acacia mangium Wild
Full text linkThe study aims to determine the impact of using liquid smoke from durian rind concentrations and different pyrolysis temperatures on the durability of particle board. The experiment was conducted at the Laboratory of Wood Workshop, Laboratory Wood Processing, and Laboratory PT. Duta Pertiwi Nusantara. Experimental method using factorial completely randomized design (CRD) with 3 replications. Parameters measured were the durability of particle board (termite mortality and weight loss particle board). Result of the research showed that termite mortality ranged between 22% - 100% and the weight loss particle board ranged between 1,6901% - 7,7239%. Particle board are resistance to subterranean termites Coptotermes curvignathus Holmgren according Sornnuwat et al (1995) standard. Key words : Smoke liquid, particle boards, Acacia mangium, Coptotermes curvignathus Holmgre