Judul: Kajian Pola Hubungan Antara Sifat Fisik dan Komposisi Kimiawi Bahan Pakan Hijauan
Abstrak: The physical properties are indicator of testing the quality of raw material which is very important in addition to chemical and biological tests. This research observed physical properties and chemical composition of forage materials Gliricidia sepium, Calliandra calothyrsus, Leucaena leucocephala, Indigofera sp, Trichantera gigantea, Carica papaya, Manihot utilissima, and the relationship between the physical properties and chemical composition of the feed materials. The study was conducted for 2 months by measuring physical properties and proximate and van soest for chemical composition analysis of forage. The results showed that specific gravity was negatively affected by crude protein (r = - 0.654) and positively affected by ash (r = 0.692) were significantly different at P < 0.05. Bulk density negatively affected by crude protein (r = - 0.522) were significantly different at P < 0.05. Bulk density compaction negatively affected by crude protein (r = - 0.644) and neutral detergent insoluble crude protein (r = - 0.767) were significantly different at P < 0.05. It can be concluded that the relationship between physical properties and chemical composition of forage have a small effect excepted for the crude protein.
Keyword: physical properties, forage, chemical composition

Judul: Karakteristik sifat fisik jagung, dedak padi dan pollard
Abstrak: Physical properties of feed are important aspect in feedrnill industry. To meet a high efficiency in feed handling, storage, processing and to reduce looses during processing needed the information on chemical composition, nutritive value and physical properties of feed. The experiment was carried out to determine the physical properties of corn , rice brand and pollard from different moisture content. Corn, rice brand and pollard were collected from two factories. Specific gravity, bulk density, compacted bulk density, angle of repose and floating rate of the groups were determined. The data were statistically analyzed using the analysis of variance in completely randomized factorial design. The results of the experiment showed the physical properties of corn are, specific gravity (1260.30 g/l and 1213.83 dl), bulk density (561.55 gfl and 576.608/1), compacted bulk density (784.43 g/l and 797.08 gll), angle of repose (38.20' and 38.69'), floating rate (3.18dsec and 4.04 dsec). While at rice brand between two companies have specific gravity (1 106.45 g/l and 1066.38 dl), bulk density (270.0 g/l and 362.5 gll), compacted bulk density (425.0 g/l and 557.5 dl), angle of repose (45.4689' and 43.4680°), floating rate (3.5908 dsec and 4.0650 dsec), and specific gravity (1068.75 g/l and 1149.05 dl), bulk density (292.5 gll and 295.0 gh), compacted bulk density (437.5 g/l and 450.0 dl), angle of repose (37.3634' and 44.9312'), floating rate (3.0607 dsec and 3.4043 dsec) for pollard respectively. Keywords : moisture content, specific gravity, bulk density, compacted bulk density, angle of repose, floating rate
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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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