Judul: Sifat Fisis-Mekanis Papan Partikel dari Serbuk Bulu Domba, Serbuk Gergaji, dan Serutan Kayu Sengon (Paraserianthes falcataria)
Abstrak: Indonesian or local sheep is classified as a meat type. It is not classified as a wool type because the wool yielded are coarse, so it is not optimally used. Wool can be added in the making of particle board because of its strength, pressure resistance, good insulator, and sound absorption properties. Paraserianthes falcataria (Sengon) saw dust and wood shaving are wood processing waste which can be used as particle board because it contains lignocellulose fiber. This research was to find the best formulation of wool dust (chopped wool at the length of 2-3 mm), saw dust, wood shaving and adhesive concentration used (urea formaldehida). The experiment will be conducted as a factorial experiment with two factors. The factors are wool dust, sawdust, and wood shaving combination (0% :60% : 40% ; 10% : 50% : 40% ; 20% : 40% : 40% ; 30% : 30% : 40%) and adhesive concentration (16, 18, and 20%). The parameter scored are the density, moisture content, thickness swelling, water absorbing capacity, modulus of rupture, modulus of elasticity, internal bond and strength of screw holding power. Any significant differences data will be further analyzed with Polynomial Orthogonal. The result showed that wool dust significantly improved the water absorbing capacity, modulus of rupture, and modulus of elasticity. The urea formaldehida adhesive significantly improved the density and water absorbing capacity. The interaction of two factors significantly improved the thickness swelling, internal bond, and strength of screw holding power. The data from this research showed that the number of density between 0,69-0,78 g/cm3, moisture containt with mean 6,49%, thickness swelling between 32,36-83,9%, water absorbing capacity beetween 89,04-169,15%, modulus of rupture between 68,4- 121,8 kgf/cm2, modulus of elasticity between 671,84-1381,51 kgf/cm2, internal bond between 0,44-1,3 kgf/cm2, and strength of screw holding power between 6,0-22,3 kg. To find out the proportion of the product that suite the JIS A 5908 and SNI 03-2105, the distribution of the data was estabilished and the area under the normal curve (represent the proportion) was examined. From the stand point of density, moisture containt and modulus of rupture more than 95% of the product suited to the standards. However, from the stand point of thickness swelling, modulus of elasticity, internal bond, and strength of screw holding power none of the product suited to the standards.
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Judul: Pemanfaatan Cangkang Kemiri Sunan dan Serutan Kayu sebagai Bahan Papan Partikel
Abstrak: Woods are usually used as a raw material of furniture and other wood-based products. Since technology grows rapidly, wood-based products can be made not directly from whole real wood. They can be made from other wood-like processed materials such as hardboard, insulation board, particle board, plywood, and fiberboard. In this research, shell of Aluerites Trisperma Blanco, in Indonesian known as Kemiri Sunan, and wood shaving was used as raw materials of particle board. The objective of this research are (1) to study the effects of difference of material composition to mechanical, physical, and thermal properties of particle board, and (2) to look for the best composition of shell of kemiri sunan and wood shaving. From the research it can be concluded that difference of material composition affects only water content, swelling, modulus of elasticity, modulus of rupture, and internal bonding of particle board. Density, heat spesific, and conductivity are not affected. The best composition was found to be 25% of shell and 75% of wood shaving. At this composition, board density was 0.78 g/cm3, water content 9.23%, swelling 5.93%, modulus of rupture 77.92 kgf/cm2, modulus of elasticity 8.3x102 kgf/cm2, internal bonding 7.98 kgf/cm2, heat spesific 3.64 kJ/kg.K, and conductivity 0.195 W/m.K.
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Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular