Judul: Pengujian Lentur Balok Laminasi-Mekanik Kayu Mahoni (Swietenia macrophylla King)
Abstrak: Laminated beam (LB) is a modified product made of two or more laminas bonded with adhesive or mechanical joints. This research aims to determine the mechanical properties and analyze the flexural characteristics of mechanicallaminated beam (MLB). The MLB's manufacturing is divided into several sections: wood drying, LB manufacturing, arranging, bonding, clamping, conditioning, jointing using nails or screws, and testing. Three types of laminated beam was prepared in this research, with addition of one glued laminated timber (Glulam). Type-1 beam used screws or nails along its length as the jointer of laminas. Nails or screws on type-2 beam was put on the one third length of the span, on both ends of the beam, and given adhesive on the one third span, in the middle of the beam. Nail or screw on the type-3 was put on the one-third span, the middle, and adhesives on the one-third span on both ends of the beam. The results show that type-3 LB has highest modulus of elasticity (MOE) value. The highest value of MOE on LB with 0.3 cm-nails is 52298.58 kg/cm2; moreover, the lowest MOE was achieved by type-1 LB with 0.3 cm-diameter nails: 11077.41 kg/cm2. The highest modulus of rupture (MOR) value was achieved by type-1 LB with 0.3 cm diameter-nails, while the lowest was obtained on the type-3 LB with 0.5 cm diameter-nails: 207.36 kg/cm2. Glulam has higher MOE and MOR values compared to all MLB. The positioning of screws, nails, and adhesives on LB has significant effect on MOE value. The damage on MLB was shown in form of flexural failure and delamination.
Keyword: Bogor Agricultural University (IPB), mechanical-laminated beam, mahogany wood, glulam beam, flexural testing

Judul: Verifikasi Empiris Persamaan Lentur Statis Glued Laminated Timber (Glulam)
Abstrak: INTRODUCTION. Wood in construction is often loaded by bending moment. Since the development of wood engineering increasing, the solid wood tends to be substituted by wood’s engineering such as glulam. Glulam is usually made from some laminas. A Transformed Cross Section method has widely used to calculate the mechanical properties of glulam if each lamina’s properties are known. The method transforms each lamina based on its MOE. The longitudinal width is decreased if the MOE is lower, and increased if the MOE is higher. However MOE is a material property which is independent from the geometric property, calculated MOE based on geometric properties is not accurate. Bahtiar (2008) was developed a new methods to calculate the bending properties of glulam. The method is mathematically proven. However it would be better if empirical experiment is conducted to prove it. METHOD. Materials used in this research are 2x10x170 cm3 boards from 4 wood species, namely : Nangka (Artocarpus heterophyllus), Kapuk (Ceiba pentandra), Afrika (Maesopsis eminii), and Sengon (Paraserianthes falcataria), noted by N, R, A, and S respectively, and isosyanate adhesive to bond three layers glulam. Face and back of glulam are N and core is R, A, or S. Test of wood small clear specimen and glulam bending properties is conducted with center point loading configuration based on ASTM D143. Then the equation of load-deformation curve is built on two ways. The first way is only linier regression for data below proportional (elastic) limit; the second way is dummy variable regression which allows both linier regression for data bellow proportional limit and continued by quadratic regression for data upper proportional limit until maximum load. The empirical MOE and MOR are calculated by and equation respectively. The theoretical MOE and MOR are calculated by Bahtiar’s methods (2008). RESULTS AND DISCUSSION. The results of this research show that the average value of MOE calculated by first method for Nangka is 6,3x104 Kg/cm2, Afrika 5,9x104 Kg/cm2, Sengon 5,3x104 Kg/cm2, and Kapuk 2,7x104 Kg/cm2. Average value of MOE calculated by second method for Nangka 6,0x104 Kg/cm2, Afrika 5,6x104 Kg/cm2, Sengon 5,0x104 Kg/cm2, Kapuk 2,6x104 Kg/cm2. The MOE calculated by second method is similar with the first methods for Kapuk but lower for three other species. Average value of MOR of Nangka is 680 Kg/cm2, Afrika 490 Kg/cm2, Sengon 460 Kg/cm2, Kapuk 273 Kg/cm2. The average value of theoretical MOE for glulam N-A-N formation is 6,2x104 Kg/cm2, N-S-N is 5,8x104 Kg/cm2, and N-R-N is 5,9x104 Kg/cm2. The average value of theoretical MOR for glulam N-A-N is 617 Kg/cm2, N-S-N is 584 Kg/cm2, and N-R-N is 675 Kg /cm2. The average value of empirical MOE for glulam N-A-N is 4,6x104 Kg/cm2, N-S-N is 4,9x104 Kg/cm2, and N-R-N is 4,5x104 Kg/cm2. Meanwhile the average value of empiric MOR for glulam N-A-N is 256 Kg/cm2, N-S-N 261 Kg/cm2, N-R-N is 223 Kg/cm2. Theoretical calculation of MOE and MOR of glulam are significantly different with empiric testing result of glulam. Empirical testing shows that the average value of MOE and MOR lower than theoretic calculation. The adhesion of glulam is weaker than the
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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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