Judul: Karakteristik Aus Pisau Tungsten Carbide Terlapisi Bahan Pengeras pada Pemotongan Kayu Mersawa (Anisoptera spp)
Abstrak: In wood industry cutting, tools material of high speed steel (HSS) and tungsten carbide (WC) are used largely. An innovative technology to improve the wear resistence is deposition of hard coating film on the surface of tools. The purpose of this research was investigate wear characteristic of WC coated with titanium aluminum nitride (TiAlN), titanium silicon nitride (TiAlN/TiSiN), and titanium boron nitride (TiAlN/TiBN). Tool wear was determined by the edge recession, chemical wear, and the delamination of coating film on clearance face. Mersawa (Anisoptera spp) wood with density of 0.8 g/cm3, extractive of 5.87 %, and silica content of 1% was routed to determine the wear resistance of the coated cutting tools. The extractive content provides a significant contribution on the chemical wearing of the cutting tools. Cutting tests were conducted at a CNC router with cutting speed abaut 16.7 m/s and spindle speed about 10000 rpm. Experimental results showed that TiAlN/TiBN coated has the best performance in the wear resistence. Silica content in Mersawa is an important anorganic component in determining the tool wear rate. Resistence on delamination wear depends on the bonding strength, resistence on oxidation and the coefficient of friction.
Keyword: coated tool, coefficient of friction, silica, delamination wear

Judul: Tool Life Characteristics of Coated Tungsten Carbide for Cutting Medium Density Fiberboard
Abstrak: Kebutuhan masyarakat terhadap kayu gergajian semakin meningkat, namun kayu gergajian yang bermutu semakin langka. Akibatnya, industri mebel mulai menggunakan bahan alternatif seperti medium density fiberboard (MDF). Salah satu faktor penting terkait produktivitas dalam industri mebel adalah masa pakai pisau dalam proses pengerjaan. Surface coating merupakan salah satu inovasi teknologi untuk meningkatkan daya tahan aus, sehingga akan memperpanjang masa pakai mata pisau. Penelitian ini bertujuan menentukan karakteristik masa pakai pisau tungsten carbide dengan bahan pengeras TiN, TiAlN, AlCrN, dan tanpa bahan pelapis sebagai kontrol pada pemotongan MDF. Proses pemotongan dilakukan pada mesin computer numerical control (CNC) router pada laju bilah per putaran yang bervariasi. Tingkat keausan dihitung berdasarkan edge recession dan delaminasi pada bagian muka pisau (clearance face). Selanjutnya, masa pakai dihitung dengan Taylor tool life. Hasil penelitian menunjukkan bahwa pisau yang dilapisi bahan pengeras AlCrN menghasilkan daya tahan aus terbaik dan masa pakai terlama. Panjang pemotongan mempengaruhi jumlah aus yang diperoleh, sehingga masa pakai mata pisau semakin singkat seiring pertambahan panjang pemotongan, The community's need for sawn wood is increasing, but quality of sawn wood is increasingly scarce. As a result, the furniture industry has begun to use alternative materials such as medium density fiberboard (MDF). One of the important factors related to productivity in the furniture industry is the tool life in the cutting process. Surface coating is one of the technological innovations to increase wear resistance, which will extend the tool life. The purpose of this research was to determine the tool life of TiN, TiAlN, AlCrN coated tungsten carbide and uncoated (as untreated) in cutting MDF. The cutting process was carried out on a computer numerical control (CNC) router machine with various feed rate. The wear rate was calculated based on the edge recession and delamination on the blade face (clearance face). Furthermore, the tool life was calculated by Taylor tool life. The results showed that the coated tool with AlCrN coated produced the best wear resistance and the longest tool life. The length of the cut affected the amount of wear obtained, so the tool life shortened as the length of the cut increases
Keyword: coated tools, delamination, edge recession, tool life, wear resistance

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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