Judul: Basic properties, treatability, and finishing properties of tumih (combretocarpus rotundatus miq.) wood from central kalimantan
Abstrak: Penelitian ini bertujuan untuk menganalisis sifat dasar, keterawetan, dan finishing kayu tumih asal Kalimantan Tengah serta menganalisis pengaruh pengeringan awal dengan oven dan microwave terhadap sifat keterawetan dan finishing-nya. Hasil penelitian menunjukkan bahwa kayu tumih berwarna cokelat kemerahan, bertekstur kasar, berserat lurus, permukaan kayu mengkilap, dan bercorak. Pori-pori kayu tersusun dalam pola tata baur, didominasi oleh pori soliter meski dijumpai juga pori yang bergabung radial 2-3 sel. Diameter pori antara 68.50-510.90 μm dan berisi tilosis. Serat kayu tergolong kelas mutu III dengan panjang serat tergolong sedang (1338.39 μm). Kayu tumih lebih disarankan sebagai bahan baku mebel karena memiliki penampilan yang dekoratif, disamping sebagai bahan konstruksi (kelas kuat II; berat jenis = 0.63). Hasil uji keterawetannya memperlihatkan bahwa kayu tumih sukar diawetkan karena retensinya hanya 1.67-2.93 kg m-3 dan penetrasinya 13.22-40.66% atau 2.99-8.50 mm. Sifat finishing-nya tergolong baik (Grade 4B; ASTM D3359-02). Hasil uji finishing ini tidak dipengaruhi secara nyata oleh perlakuan cara pengeringan awal dan pengawetan borax yang diberikan., Tumih wood is a lesser-known wood species that has been used as construction material limitedly in some areas of Borneo Island. This study aimed to analyze the basic properties, treatability, and finishing properties of tumih wood and to analyze the influence of initial drying using oven and microwave to wood’s treatability and finishing properties. The result showed that tumih wood has reddish-brown colour, rough-texture, straight-grain, lustrous, and decorative. Pore distribution is diffuse, dominated by solitary but sometimes in radial-multipled of 2-3 cells. Pore diameter ranged between 68.50-510.90 μm, and contained tylosis. Its fiber was classified as quality class III and had medium length (1338.39 μm). The specific gravity of tumih wood was 0.63 that belongs to strength class II. Tumih wood is suitable for furniture manufacturing. Based on this study, the treatability of this wood was difficult because the preservative retention and penetration were 1.67-2.93 kg m-3 and 13.22-40.66% or 2.99-8.50 mm, respectively. Its finishing property was good (Grade 4B) based on ASTM D3359- 02, which was not affected by pre-drying treatment and borax preservation.
Keyword: anatomi, Combretocarpus rotundatus, finishing, keterawetan, tumih

Judul: Sifat Fisis dan Mekanis Kayu Tumih (Combretocarpus rotundatus (Miq.) Danser) Asal Kalimantan Tengah
Abstrak: Tumih wood (Combretocarpus rotundatus) is a lesser known species which usually grows in secondary forest or forest with an open canopy that is flooded with peat water and swamp peat in Central Kalimantan. The purpose of this research was to analyze physical properties and mechanical properties of tumih wood for appropriate processing and utilization. The results showed the average value of oven dry density and specific gravity of tumih wood were 0.99 g/cm3 and 0.70. Its fresh and air dry moisture content content were 63.51% and 18.64% respectively. The volume shrinkage from fresh conditions to air dry and oven dry conditions were 3.36% and 6.85%respectively. The tangential and radial shrinkage were 6.38% and 3.59% respectively. So the T/R shrinkage ratio was 1.86 which showed that this wood had good dimensional stability. Permeability of longitudinal was about 1.2 times and 1.4 times of radial and tangential permeability respectively. The mechanical test results of MOE, MOR, and hardness of tumih wood were 106 131.80 kg/cm2, 551.31 kg/cm2, and 119.45 kg/cm2 respectively. Based on this mechanical properties tumih wood was classified strength class III which is good to be used as sills, door panel, window, furniture, parquet flooring and rung .
Keyword: Bogor Agricultural University (IPB), mechanical properties., physical properties, permeability, shrinkage, tumih wood

Judul: Implementasi Algoritme Enkripsi Advanced Encryption Standard secara Paralel dengan GPU NVIDIA CUDA
Abstrak: Processor streaming architecture in GPU has provide general purpose computation which have its own potential to help CPU with its parallel computation capability. One example of supported processor streaming architecture is Fermi which is developed by NVIDIA. Furthermore, NVIDIA has developed its own software development kit namely CUDA, which can integrate many popular existing programming languanges such as C++ for GPU-based parallel computation. This research focus on the implementation of parallel AES algorithm with GPU and analyze the performance result of the implementation in two different NVIDIA devices, namely NVIDIA GeForce GT220 and NVIDIA Quadro 600. In general, the performance of parallel GPU computation is better than sequential computation for large data input. It is obtained that the maximum speedup of NVIDIA GeForce GT220 in 8 MB input is 89.3 with 180% efficiency. Higher speedup of 101.6 can be obtained by NVIDIA Quadro 600 with the same input size with around 100% efficiency.
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