Judul: Pemulihan Vegetasi di Areal Hutan yang Dikelola dengan Sistem TPTJ (Studi Kasus di Areal IUPHHK-HA PT. Suka Jaya Makmur, Kalimantan Barat)
Abstrak: Massive utilization of forest resources became one factor which caused degradation on natural forest. Forest degradation which occurred continuously could cause a change in forest composition. This could happen because seedling from invasive species dominated the area of natural forest. This research aimed to determine the composition and structure recovery of forest stands managed by TPTJ system on area of IUPHHK-HA PT. Suka Jaya Makmur, West Kalimantan. The results showed that non-commercial Dipterocarp species group had the biggest value of density and proportion among all levels Dipterocarp. Curve diameter distribution showed a balanced logged forest. The diversity in all plotarea was high. Kelampai and meranti were dominated in canopy level. Jambu monyet and kelampai were the species that dominated in seedling level. Tree and seedling had a different composition, it was shown by the ID value at >50%. This was shown by cluster analysis which divided into four groups. Commercial species proportion was generally larger than other non-commercial species.
Keyword: selective cutting and line planting, vegetation recovery, forest utilization

Judul: Kajian Aspek Vegetasi dalam Penerapan TPTI Intensif di IUPHHK/HA PT. Sarmiento Parakantja Timber, Kalimantan Tengah
Abstrak: system for present and future generations. Therefore, Indonesian Ministry of Forestry has appointed several IUPHHK/HA to serve as model for development of intensive silvicultural system for natural forest. However, this silvicultural system had negative impacts due to its exploitation activities which created considerable changes on forest ecosystem, which are mostly in the form of damage on soil and forest vegetation. Therefore there is a need for activity to evaluate the environmental condition, either in terms of composition or structure of the residual stand. The objectives of this research were learning the structure and composition of the forest stand in TPTII 2 research compartment, and comparing the results with those in TPTI 3 research compartment. Methodology. Data collection for this research was conducted in the area of PT Sarpatim, Central Kalimantan from March to April 2008. The equipments used were phi band, suunto clinometer, compass, raffia rope, staking pegs, tally sheets, writing materials, software Microsoft Excel 2003, and camera. Data were obtained through vegetation analysis with transect method. The research was conducted in 7 locations, namely in germ plasms measurement plots, TPTI 2006, TPTI 2007, TPTII 2005, TPTII 2006, TPTII 2007, and land preparation area or TPTII 2008. Each measurement plot measured 100 m x 100 m which was directed to the north with two observation strips in its two sides, measuring 100 m x 20 m. Analysis of the research data was performed with the following information: density values of healthy commercial trees, IVI, species diversity indexes, coefficient of community similarity, and stand structure. Results and Discussion. Species which dominated each research compartment varied in all growth stages. Value of species diversity in germ plasms plot was categorized as high. The lowest similarity of vegetation community was 21.87 % at pole growth stage, between research compartment of TPTI 2007 and TPTII 2008; whereas that of the highest was between TPTII 2006 and TPTII 2007, namely as much as 67.86 %. Stand structure in TPTII 2008 research compartment possessed the largest density value for surprisingly the trees with diameter class of 60 cm upward, namely 53 trees/hectare. Conclusion. Density of healthy commercial trees in the forests of germplasm, TPTI, or TPTII fulfilled the minimum requirement from TPTI guidelines. System of selective cutting created positive impacts on regeneration at sapling stage. The most dominant species was ubar. Coeficient of communited similarity on the forests of germ plasms, TPTI, and TPTII has low value, so far from 100 %. In TPTI 2006 and TPTII 2007 the structure of forest stand had inverted “J” shape.
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Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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