Judul: Aplikasi Paralon sebagai Alat Sambung Buluh Bambu Tali
Abstrak: The use of bamboo as an alternative material of building increasingly widespread, i.e. house construction utilisation, tent, stage or some tools. Bamboo has relatively better strength properties than wood should be one contributing factor. Bamboo also has a relatively light weight because its has a cavity, so it will be easier to process. Futhermore, connecting bamboo has some constraints and required special expertise. Connector from Poly Vinil Choloride (PVC) has been expected better advantage compare than rope in bamboo connection. None has been using paralon for connecting devices on bamboo, then it is necessary to do research in the bamboo culm. PVC connector testing of physical properties include moisture content, density, and shrinkage, while testing the mechanical properties include bending test and compression test. The results showed that the strength of PVC connector has a better value 48% than the rope connector which is 276,45 kg/cm . MOE and MOR values of paralon as connector also have the respectively 66,7% which are 3069,63 kg/cm2 and 385,50 kg/cm2.
Keyword: Connector, PVC, Bamboo

Judul: The effect of connection type, the position of testing, and the distance of connection to the strength of tali bamboo (gigantochloa apus kurzt)
Abstrak: Gigantochloa apus Kurzt yang dikenal dengan bambu tali atau bambu apus adalah salah satu jenis bambu yang mudah ditemukan dan banyak dimanfaatkan oleh masyarakat, khususnya masyarakat pedesaan. Pemanfaatan bambu tali sebagai bahan konstruksi belum banyak digunakan, karena masih kurangnya dukungan data penelitian mengenai karakteristik bambu tali serta modifikasi produk bambu tali dalam bidang konstruksi. Tujuan dari penelitian ini adalah menganalisis karakteristik balok bambu tali menggunakan alat sambung kombinasi pasak dan tali, serta alat sambung baut, pada posisi pengujian horizontal dan vertikal, dengan tiga variasi jarak sambungan (50, 100, dan 150) cm. Prosedur pengujian sifat lentur balok bambu menggunakan standar pengujian ISO 22157-1:2004 tentang pengujian buluh bambu secara full scale. Nilai lentur diperoleh menggunakan persamaan ASTM D-198 dan persamaan ISO 22157-1:2004. Hasil penelitian menunjukkan rerata nilai KA pada bambu tali sebesar 25.70% sampai 40.81% dan rerata nilai kerapatan contoh uji produk sebesar 0.67 g/cm3. Hasil uji mekanis menunjukkan rerata nilai MOE pada balok bambu berada pada selang 93425.16 – 165000.14 kg/cm2 (ASTM D-198) serta 166761.32 - 714347.73 kg/cm2 (ISO 22157-1:2004) dan rerata nilai MOR balok bambu berada pada selang nilai 236.48 – 571.29 kg/cm2 (ASTM D-198) serta 260.69 - 711.09 kg/cm2 (ISO 22157-1:2004). Hasil penelitian menunjukkan bahwa balok bambu perlakuan sambungan baut pada posisi pengujian horizontal merupakan balok bambu dengan perlakuan terbaik. Berdasarkan hasil penelitian ini balok bambu dapat dimanfaatkan sebagai bahan konstruksi ringan., Gigantochloa apus Kurzt known as Tali bamboo or Apus bamboo is one type of bamboo that are easy to find by the people, especially the rural communities. Utilization of bamboo as a construction material has not been widely used because the lack of data about the characteristics of bamboo and it’s modifications of tali bamboo products in construction sector. The purpose of this study is to analyze the characteristics of tali bamboo using combination of dowell and rope connection, and bolt, at horizontal and vertical position, with three distance of connection variation (50, 100, and 150 cm). The bending test method was used by ISO 22157- 1:2004 for full scale test of bamboo’s culm. Bending value was obtained from the equation of ASTM D-198 and ISO 22157.1:2004. The result showed that the average of Moisture Content (MC) of Tali bamboo in range 25.99% to 36.62% and the density was 0.67 g/cm3. The results of mechanical test showed that the mean value of tali bamboo on MOE were 93425.16 – 165000.14 kg/cm2 (ASTMD 198) and 166761.32 - 714347.73 kg/cm2 (ISO 22157-1:2004) and the MOR were 236.48 – 571.29 kg/cm2 (ASTMD 198) and 260.69 - 711.09 kg/cm2 (ISO 22157-1:2004). Based on the results of this research, this bamboo beam can be used as a respectively construction material.
Keyword: Gigantochloa apus Kurzt, sambungan baut, sambungan pasak, sambungan tali, sifat fisis, sifat mekanis

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