Judul: Pengaruh Penambahan Bahan Pengisi Arang Tempurung Kelapa Sawit terhadap Kualitas Kayu Lapis.
Abstrak: Palm oil is the main commodities of the plantation products of palm oil. High product of palm oil will result higher oil mill effluents. The purpose of this research is to determine the effect of adding fillers palm shell charcoal on some glue spreads on the physical and mechanical properties of plywood in order to improve the quality of plywood. Plywood which using adhesive mix with oil palm shell charcoal generally has been fulfilled SNI 06-0060-1998 for general use of plywood, and SNI 01-5008.7-1999 for the use of structural plywood. Plywood with added glue spreads and fillers comply qualify of interior I and II while the value of Modulus of Elasticity and Modulus of rupture get many varies. Based on the test results, the best quality plywood glue spread 300 g/m2 and filler 12%.
Keyword: 

Judul: Pengaruh Berat Labur terhadap Sifat Fisis dan Mekanis Papan Com-ply dari Kayu Karet dan Oriented Strand Board Bambu Andong
Abstrak: Alternatif memenuhi kebutuhan industri perkayuan yaitu papan com-ply. Penggunaan venir karet (Hevea brasiliensis Muel. Arg) pada lapisan permukaan dan oriented strand board bambu andong (Gigantochla pseudoarundinacea (Steudel) Widjaja) pada lapisan inti dapat menghasilkan papan com-ply yang memiliki sifat fisis dan mekanis yang unggul. Strand bambu andong diberi perlakuan steam bilas NaOH 1%. OSB dibuat dengan kadar perekat (PF) 8% dan target kerapatan 0,7 g/cm3. Analisis papan com-ply perlakuan berat labur dengan tiga taraf, yaitu 200 g/m2, 225 g/m2, dan 250 g/m2 untuk mengetahui pengaruh yang dihasilkan terhadap kualitas papan com-ply dan taraf yang optimal untuk diaplikasikan pada pembuatan papan com-ply. Nilai sifat fisis dan mekanis cenderung lebih baik pada berat labur 250 g/m2, selain MOE dan MOR sejajar seratserta IB. Secara keseluruhan, karakeristik com-ply pada setiap varian berat labur tidak memenuhi standar JIS 5908:2003 dan JAS 003:2014, terkecuali kerapatan, kadar air, serta IB., An alternative to meet the needs of the woodworking industry is com-ply boards. The use of rubber veneer (Hevea brasiliensis Muel. Arg) on the surface layer and oriented strand board of andong bamboo (Gigantochla pseudoarundinacea (Steudel) Widjaja) on the core layer can produce composite boards that have superior physical and mechanical properties. Andong bamboo strands were treated with 1% NaOH steam rinse. OSB was made with an adhesive content (PF) of 8% and a target density of 0.7 g/cm3. Analysis of com-ply boards with treatment of glue spread, namely 200 g/m2, 225 g/m2, and 250 g/m2 to determine the resulted effect of the com-ply boards quality and the optimal level to be applied to the manufacture of com-ply boards. The value of physical and mechanical properties tends to be better at 250 g/m2 glue spread, in addition to MOE and MOR parallel to fiber and IB. Overall, the com- ply characteristics of each hull weight variant did not meet the standards of JIS 5908:2003 and JAS 003:2014, with the exception of density, moisture content, and IB.
Keyword: adhesive, bamboo, com-ply, glue spread, oriented strand board

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model