Judul: Sifat Fisis dan Keawetan Kayu Mindi (Melia azedarach L.) dari Rayap Cryptotermes cynocephalus setelah Perlakuan Pemanasan Minyak Jatropha curcas
Abstrak: Kayu mindi (Melia azedarach L.) adalah salah satu jenis kayu cepat tumbuh yang potensial sebagai bahan baku di industri kayu. Kayu mindi memiliki keawetan yang rendah sehingga perlu didukung dengan proses pengawetan. Penelitian ini bertujuan untuk mengevaluasi pengaruh perlakuan pemanasan dalam minyak jarak pagar (Jatropha curcas) terhadap sifat fisis dan keawetan kayu mindi (Melia azedarach) dari rayap kayu kering (Cryptotermes cynocephalus). Kayu mindi diberi perlakuan rendaman dingin dan panas dalam minyak jarak pada suhu 120 °C, 150 °C dan 180 °C. Waktu rendaman panasnya adalah selama 1 dan 3 jam. Hasil penelitian ini menunjukkan bahwa perlakuan minyak jarak tersebut meningkatkan stabilitas dimensi kayu mindi. Kadar air, kerapatan dan stabilitas dimensi kayu mindi yang dipanaskan dengan minyak jarak selama 3 jam pada suhu 180 °C nyata lebih baik dibandingkan dengan perendaman dingin maupun pemanasan minyak jarak selama 1 jam. Keawetan kayu mindi terhadap serangan rayap kayu kering meningkat setelah pemanasan dengan minyak jarak dengan suhu 180 °C selama 1 jam atau selama 3 jam.
Keyword: kayu mindi, keawetan kayu, minyak jarak pagar, perlakuan pemanasan, sifat fisis

Judul: Sifat Fisis, Sifat Mekanis, dan Sifat Finishing Kayu Mindi (Melia azedarach L.) setelah Perlakuan Pemanasan
Abstrak: Mindi (Melia azedarach L.) is a fast-growing wood species which is quite prospective for wood industry but it should be supported with proper technology application to produce good quality wood products. This research was done to evaluate the effect of heating treatment with various times and temperatures on the physical, mechanical, and finishing properties of mindi wood. Wood heating in oven and oil were at temperatures of 120 °C, 150 °C, and 180 °C for 2, 5, and 8 hours. The results showed that the heating wood in various conditions increased wood dimensional stability in both tangensial and radial directions. The moisture content, density, and dimensional stability of wood heated in oil were better than those heated in oven. Heating at 180 °C reduced the mechanical properties of mindi wood. The finishing test with cross cut methode showed that the oven heating did not affect finishing quality, except the 8 hours oil heating at 180 °C that reduced the finishing quality.
Keyword: physical properties, mindi wood, mechanical properties, heat treatment, finishing peroperties

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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