Judul: Karakterisasi Fisik, Mekanik, dan Termal pada Berbagai Komposisi Material Coco-conblock (Beton Serat Sabut Kelapa) Untuk Dinding
Abstrak: Penelitian ini bertujuan untuk mengetahui rasio penggunaan sabut kelapa yang optimal dan mutu yang diperoleh sebagai bahan penyusun beton serat dengan menguji sifat fisik, mekanik, dan termalnya. Perbandingan semen dan pasir yang digunakan ialah 1:3 dan 1:5 dengan variasi konsentrasi penambahan serat sebesar 0%; 10%; 20%; 30%; dan 40% terhadap massa semen. Benda uji untuk pengujiannya berbentuk balok dengan ukuran berkisar 16 x 4 x 4 cm. Pengujian dilakukan pada benda uji berumur 3, 7, dan 28 hari. Hasil pengujian menunjukkan bahwa dengan penambahan serat serabut kelapa menyebabkan penurunan nilai kuat tekan sebesar 30-80% dan kuat lentur sebesar 30-66%. Proporsi serat 10% menghasilkan nilai tertinggi dibandingkan beton dengan konsentrasi serat lainnya. Coco-conblock mampu menghemat pemakaian energi 7-44% dibandingkan batu bata.
Keyword: Beton serat, serat sabut kelapa, sifat fisik, sifat mekanik, dan sifat termal

Judul: Karakteristik Fisik, Mekanik dan Termal Papan Partikel Sabut Kelapa (Cocos nucifera L.) Berlapis Bambu Betung (Dendrocalamus asper sp.) Sebagai Material Bangunan
Abstrak: Demand of woods as raw materials in the industry are more than the availability, therefore research is needed to develop the other alternatives to substitute the woods as the primarily raw material. In this case, the aim of this research are to construct particle boards made of coco fiber and betung bamboo and to research their physical, mechanical and thermal characteristics. Physical characteristics of particle board have qualified the particle board standards, that are: density 0.79 cm3/g, moisture content 13.88 %, and water absorption 40.1%, except the thickness swelling percentage reached 15.18%. The mechanical characteristics of particle board have qualified the JIS A 5908-2003 and SNI 03-2105-2006 standards, that are: tensile strength 137.57 kgf /cm2, compressive strength 87.44 kgf/cm2, Modulus of Elasticity (MOE) 24970.46 kg/cm2, screw-withdrawal strength 105.81 kgf, and internal bond 2.54 kgf/cm2, except the Modulus of Rupture (MOR) value that only reached 21.10 kg/cm2. This study also reveals that using particle boards made of coco fiber and bamboo betung as storage walls are less capable to prevent the oven heats which is proven by the increasing of temperature of taro inside the storage box along the increasing of temperature of the oven.
Keyword: betung bamboo, coco fiber, mechanical characteristics, particle boards, physical characteristics

Judul: A Continuous Vaccination Strategy in the SVIR Epidemic Model
Abstrak: Vaccination is conducted to minimize the spread of a disease. The vaccination is usually done several times within a fixed time interval. In the SVIR model, it is assumed that individuals do not get immediate immunity following a vaccination program. So according to process of vaccination on SVIR model, there are two strategies, i.e. the continuous vaccination strategy (CVS) and the pulse vaccination strategy (PVS). In this study, only the CVS strategy in epidemic model SVIR is considered. Results of the study indicate that dynamics of the CVS system depends on the basic reproductive number. If the basic reproductive number is less than one, then the disease-free fixed point is asymptotically stable. It means that the disease will eventually disappear from the population. Conversely, if the basic reproductive number is greater than one, then the endemic fixed point is asymptotically stable, which means that the disease will remain exist in the population. Simulation result shows that the vaccination would minimize the spread of disease by reducing the basic reproductive number. If the time for the vaccinated recipients to obtain the immunity, as well as a possibility of vaccinated recipients to be infected are neglected, then the disease will be eradicated. This condition is called an over-evaluating effect of vaccination.
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