Judul: Karakteristik Hasil Fumigasi Amonia dan Daya Tahan Lapisan Finishing Pelarut Air (Waterbased Lacquer) pada Beberapa Jenis Kayu Rakyat
Abstrak: Kayu hutan rakyat memiliki peluang yang tinggi untuk dijadikan produk bernilai tambah yang tinggi, khususnya furniture. Akan tetapi, kayu dari hutan rakyat memiliki penampilan yang kurang menarik (warna pucat dan tidak seragam, serta corak serat kurang menarik) sehingga perlu adanya upaya untuk meningkatkan kualitas tampilan alaminya, salah satunya dengan metode fumigasi amonia. Metode fumigast ini dapat merubah warna dan penampilan kayu menjadi lebih menarik secara alami. Fumigasi amonia dapat digunakan sebagai metode pewarnaan kayu, selain menggunakan staining atau dyeing. Penggunaan metode fumigasi amonia dalam proses finishing kayu juga akan membantu dalam meningkatkan efektifitas dan efisiensi dari proses finishing. Selain itu, bahan finishing yang digunakan sebaiknya aman bagi manusia dan memiliki kekuatan fisik lapisan film yang baik. Salah satu jenis bahan finishing yang aman bagi lingkungan adalah bahan finishing pelarut air (waterbased lacquer). Oleh karena itu, penelitian ini bertujuan untuk mengetahui aplikabilitas pewarnaan alami kayu dengan metode fumigasi amonia dan efektifitasnya terhadap rayap kayu kering (Cryptotermes cynocephalus Light), serta menguji daya tahan lapisan finishing pelarut air (waterbased lacquer) terhadap bahan kimia rumah tangga, hot and cold test, dan cross cut test pada sembilan jenis kayu rakyat terfumigasi dan tanpa fumigasi, delapan jenis diantaranya kayu rakyat yang diteliti, seperti kayu akasia, jengkol, kemang, laban, lamtoro, manglid, puspa, dan watu gunung. Satu jenis yang paling populer bagi konsumen Amerika dan Eropa juga diujikan, yaitu kayu oak. Hasil pengujian menunjukkan bahwa metode fumigasi amonia meningkatkan nilai estetika kayu (tampilan warna dan corak alami) dan keawetan kayu. Selain itu, hasil pengamatan secara visual pada kondisi permukaan kayu terhadap pelunturan bahan kimia rumah tangga dengan interval 1 jam dan 24 jam, dan hot and cold test menunjukkan bahwa bahan finishing pelarut air memiliki daya tahan lapisan yang kuat, sehingga diklasifikasikan ke dalam kelas 10. Pada pengujian daya lekat cat (uji cross cut), contoh uji kayu jengkol terfumigasi dan tanpa fumigasi diklasifikasikan ke dalam Grade 4B dan delapan jenis kayu yang lainnya termasuk Grade 5B.
Keyword: Institut Pertanian Bogor, IPB, Kayu Rakyat, Waterbased, Wood Finishing, Uji Cross Cut, Oak, Bogor Agricultural University

Judul: Karakteristik Hasil Fumigasi Amonia dan Daya Tahan Lapisan Finishing Berpelarut Air Pada Beberapa Jenis Kayu dari Hutan Rakyat
Abstrak: Wood from community forest in general have a pale color, not durable, and has a less attractive appearance. Wood finishing was one of the ways to solve these problem. Ammonia fumigation was one method to change the natural wood’s color. Before marketed, furniture usually coated in order to make the better appearance and reduce the surface erosion. Waterbased wood finish used in this study did not containe toxic and ecofriendly. The purpose of study is to determine color change and durability of wood from community forest after the fumigation of dry wood termites (Cryptotermes cynocephallus Light), determine the cross cut of finishing waterbased, and to determine the durability of finishing waterbased layer for chemical household, hot, and cold. Result of this study showed that jackfriut wood, mahogany wood, teak wood, manilkara wood, and vi rasamala wood occur significant color changes while angsana wood, manii wood, and kaboril wood didn’t occur significant color change. Ammonia fumigation can increase the resistance of wood to dry wood termite attack, where the weight loss of ammonia fumigated wood was smaller than weight loss sample of unfumigated wood. Waterbased wood finished have good resistance to chemical household at one hour and 24 hours intervals and have good resistance to heat and cold. Cross cut result showed that waterbased wood finished have good adhesion at wood surface.
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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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