Judul: Sifat Fisis Dan Mekanis Kayu Plastik Polistirena Dari Kayu Sengon, Manii, Dan Gmelina
Abstrak: Kayu jenis cepat tumbuh merupakan alternatif pemenuhan kebutuhan kayu, namun kayu-kayu tersebut kebanyakan masih merupakan kayu muda yang memiliki sifat fisis dan mekanis yang rendah. Untuk memperbaiki sifat tersebut, modifikasi sifat kayu melalui impregnasi polistirena merupakan salah satu pilihan yang mudah dan tidak sulit. Tiga jenis kayu cepat tumbuh yang digunakan adalah sengon (Falcataria moluccana Miq.), manii (Maesopsis eminii Engl.), dan gmelina (Gmelina arborea Roxb.). Ketiganya diimpregnasi dengan monomer stiren dan dipolimerisasi secara pemanasan. Hasil menunjukkan peningkatan sifat fisis dan mekanis kayu. Kadar polimer tertinggi terdapat pada sengon sebesar 82.41%. Kembang susut kayu berkurang dengan kisaran 2.48-53.17%. Nilai MOE dan MOR meningkat dengan kisaran 9.22-45.36%. Keteguhan geser tangensial tertinggi pada manii ter-impregnasi sebesar 67.62 kg/cm2. Nilai kekerasan bidang radial dan tangensial turut mengalami peningkatan berkisar 8.05-38.81%.
Keyword: Impregnasi, polistirena, sifat fisis-mekanis

Judul: Physical and mechanical properties of poly ethylene glicol and polystyrene wood from mangium (acacia mangium willd.) and pine (pinus merkusii jungh. et de vries)
Abstrak: Impregnasi kayu merupakan salah satu teknologi modifikasi kayu untuk meningkatkan sifat fisis dan mekanis. Tujuan penelitian ini adalah untuk membandingkan sifat fisis dan mekanis kayu Mangium dan Tusam dengan pemberian Poly Ethylene Glicol (PEG) dan Polystyrene. Bahan baku yang digunakan yaitu kayu mangium dan tusam. Impregnasi kayu dilakukan dengan menggunakan metode vakum tekan yaitu dengan pengisian bahan kimia seperti poli etilen glikol (PEG) dan polistiren ke dalam kayu dengan proses polimerisasi pemanasan. Jenis pengujian sifat fisis dan mekanis yang dilakukan mengacu pada British Standard (BS) 373:1957 meliputi kadar air, kerapatan, kembang susut, keteguhan lentur statis, keteguhan patah, keteguhan geser, dan kekerasan. Hasil pengujian menunjukkan nilai rata-rata kadar air pada kayu mangium berkisar 7.26-10.17% dan kayu tusam berkisar 8.75-15.64%. Nilai rata-rata kerapatan pada kayu mangium berkisar 0.44-0.55 g/cm3 dan kayu tusam berkisar 0.70-0.96 g/cm3. Nilai rata-rata kembang susut pada kayu mangium berkisar 1.40-5.53% dan kayu tusam berkisar 0.61-3.96%. Nilai rata-rata keteguhan lentur statis pada kayu mangium berkisar 44678-74924 kg/cm2 dan kayu tusam berkisar 43754-69938 kg/cm2. Nilai rata-rata keteguhan patah pada kayu mangium berkisar 337-589 kg/cm2 dan kayu tusam berkisar 251-615 kg/cm2. Nilai rata-rata keteguhan geser pada kayu mangium berkisar 40-90 kg/cm2 dan kayu tusam berkisar 34-104 kg/cm2. Nilai rata-rata kekerasan pada kayu mangium berkisar 356-583 kg/cm2 dan kayu tusam berkisar 201-717 kg/cm2. Pemberian polistiren dan poli etilen glikol baik pada kayu mangium maupun tusam dapat meningkatkan kadar air, kerapatan, keteguhan lentur statis, dan kekerasan tetapi kembang susut, keteguhan patah dan keteguhan geser menurun., Impregnation of timber is one of the wood modification technology to improve the physical and mechanical properties. The research objective it was to compare physical and mechnical properties on mangium and pine timber impregnated with poly ethylene glicol (PEG) and polystyrene. The materials used were mangium and pine. Impregnation used vacuum pressure method which was by filling chemical substances of poly ethylene glicol (PEG) and polystyrene through by thermal polimerisation on the timber. The test impregnation wood conducted by refer the (British Standard (BS) 373:1957) comprised moisture content, density, shrinkage swelling, stiffness, static bending strength, shear strength and hardness. The result showed the average value of the moisture content ranged 7.26-10.17% for mangium and 8.75-15.64% for pine. The average value of the density ranged 0.44-0.55 g/cm3 for mangium and 0.70-0.96 g/cm3 for pine. The average value of the shrinkage swelling ranged 1.40-5.53% for mangium and 0.61-3.96% for pine. The average value of the stiffness ranged 44678-74924 kg/cm2 for mangium and 43754-69938 kg/cm2 for pine. The average value of static bending strength ranged 337-589 kg/cm2 for mangium and 251-615 kg/cm2 for pine. The average value of shearing strength ranged 40-90 kg/cm2 for mangium and 34-104 kg/cm2 for pine. The average value of hardness ranged 356- 583 kg/cm2 for mangium and 201-717 kg/cm2 for pine. The addition of polystyrene and poly ethylene glycol into mangium or pine are increasing the moisture content, density, stiffness and hardness, but shrinkage swelling, static bending strength and shearing strength are decreased.
Keyword: mangium, poli etilen glikol, polistiren, sifat fisis dan mekanis, tusam

Judul: Studi Kasus Diagnosis Pencitraan Gangguan Saluran Pencernaan Atas Anjing Schnauze
Abstrak: The aim of this study was to learn the role of diagnostic imaging to define the diagnose of the upper gastrointestinal tract disorder of the Schnauzer. The information from the owner (anamneses) stated that the dog has been vomiting for a year, sometimes containing blood. There might also be a possibility that it had eaten a corpus alineum. This study case covered physical examination, hematology and blood chemical analysis, radiography, ultrasonography, and endoscopy performed. Physical examination showed weight loss and anorexia. Hematology and blood chemical analysis showed an increase in lymphocyte, haemoglobin (Hb), haemotocrit (Hct), ureum, creatinine, alanin aminotransferase (ALT), and alkaline phosphatase (ALP). Abdominal radiograph showed no abnormality in the abdominal organs. Abdominal ultrasonography showed a hyperechoic mass on the stomach mucosal surface. The mass forms an acoustic shadowing at the ventral. The acoustic shadowing in the stomach may be caused by an accumulation of gas or foreign object such as bone. Endoscopy showed that there was inconsistency of stomach mucosa surface, foamy bile fluid in the stomach, ulcers, and erosion of the stomach mucosal surface. Based on the endoscopy performed, the animal was clearly diagnosed with chronic gastritis accompanied by stomach ulcer and erosion.
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