Judul: Prediksi Kedalaman Ketenggelaman Roda Traktor Roda-4 pada Tanah Sawah Berdasarkan Hasil Uji Geser Langsung
Abstrak: Paddy soil tillage in Indonesia is still employed by human power, animal power, and hand tractor which requires more time so that resulting low capacity, whereas the use of four-wheel tractor is relatively little. In application, agricultural mechanization causes reciprocal relationship between soil and tractor. Reqiurements in the application of four-wheel tractors on soil tillage are such the ground pressure must be smaller than soil shear strength and sinkage must be smaller than ground clearance of tractor. In this research, estimation of sinkage determined based on direct shear test on undisturbed soil and disturbed soil. The results shows that increasing water content results in declining soil cohesion and soil shear strength. It leads to bigger sinkage. Analysis of using undisturbed soil produces smallest sinkage in SS location dominated by clay fraction with 0.33- 5.49 cm on soil cohesion 0.282-0.397 kgf/cm2 andbiggest sinkage is in S-14 location dominated by the silt fraction with higger than tractor ground clearance (35.5 cm) and soil cohesion 0.011-0.029 kgf/cm2. Based on the predicted results, four-wheel tractor can only operate in location SS and L-18.
Keyword: direct shear test, paddy soil, four-wheel tractor, Sinkage

Judul: Pendugaan Kedalaman Tekan Roda Traktor Roda Empat Berbasis Uji Kedalaman Tekan Telapak Kaki Manusia
Abstrak: Load of a tractor on certain terrain condition may cause sinkage, which results motion resistance on its four wheels. This motion resistance reduces its mobility and decreasing work capacity. This research was aimed to predict the sinkage of a fourwheel tractor based on human footprint approximation. The parameters examined for the sinkage prediction were pressure and the physical properties of soil. Based on the observations, water content can be used as representative of other soil properties. Through linear regression analysis, some equation models for predicting human footprint and tractor sinkage were obtained. The equation models employed water content and normal pressure as the independent variables. Those models were then compared with the observed tractor’s sinkage to find the best fitted model. Equation model zkskid = 12.804 - 0.275(ka) + 6.56(P) through male subject and zkdkab = 18.028 - 0.262(ka) - 7.304(P) through female subject were the best fitted model that can be used for sinkage prediction of four-wheel tractors.
Keyword: soil, equation model, sinkage, footprint, tractor, Bogor Agricultural University (IPB)

Judul: Infeksi Virus Parainfluenza Pada Anjing
Abstrak: Virus parainfluenza anjing termasuk famili Paramyxoviridae, berbentuk pleomorf dengan ukuran bervariasi (bergaris tengah antara 100-500 nm), berpembungkus peka ether, berisi genom RNA dan secara serologis mempunyai kesamaan dengan virus SV-5 kera; dikenak sebagai salah satu kausa penting dari sindrom "kennel cough". Infeksinya dapat mengenai anjing semua umur yang belum pernah terinfeksi atau mendapatkan vaksinasi mengakibatkan gejala klinis ringan yang terbatas pada traktus respirasi atu infeksi yang secara klinis tidak memperlihatkan gejala nyata. Gejala klinis yang nampak setelah masa inkubasi (1-5 hari) terlewati berupa batuk yang tidak berat selama beberapa hari, berbagai tingkat tonsilitis dan pharyngitis dan kadang-kadang ditemukan kenaikan temperatur rektal antara 1-2 derajat C dari temperatur normal rat-rata. Anjing terinfeksi mengandung virus pada traktus respirasi bagian atas dan bawah serta limfonoduli sampai hari ke 9 setelah infeksi. Penyebaran virus antar anjing terjadi secara aerogen.
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