Judul: Profil Daya Rekat Dan Kinerja Resin Fenolik: Aplikasi Dalam Teknologi Papan Partikel
Abstrak: Fenol formaldehida (FF) merupakan resin yang terbentuk dari reaksi pengikatan dan kondensasi antara senyawa fenol dengan senyawa formaldehida. Secara terbatas keragaman resin FF mnngkin tergantung pada pemilihan senyawa fenoIik, nisbah molar antara fenolik dengan fonnaldehida, jumlah dan jenis katalis yang digunakan, serta waktu dan suhu reaksi. Resin FF merupakan perekat yang biasa digunakan dalam industri papan partikel sehubungan dengan sifatnya yang lahan cuaca, tahan pakai, dan tahan bahan kimia.
Keyword: 

Judul: Characteristics of Phenol-Formaldehyde Adhesives with Mixtures of Different Types and Levels of Catalysts and their Tensile Strength Properties
Abstrak: Perekat fenol-formaldehida merupakan salah satu polimer thermoset komersial yang banyak digunakan sebagai perekat dalam industri komposit kayu (papan partikel, kayu lapis, OSB, dan lainnya) karena berbagai keunggulan yang dimilikinya. Analisis karakteristik perekat dengan penambahan jenis katalis yang bersifat basa seperti NaOH dan CaCO3 pada dua taraf konsentrasi yang berbeda yaitu 1% dan 5% dilakukan untuk mengetahui pengaruhnya terhadap karakteristik perekat, dan taraf optimal yang bisa diaplikasikan pada pembuatan produk komposit. Faktor jenis katalis berpengaruh nyata pada viskositas dan pH perekat PF pada tingkat kepercayaan 95%, sedangkan faktor taraf katalis berpengaruh nyata pada kadar padatan, viskositas dan waktu gelatinasi perekat PF pada tingkat kepercayaan yang sama. Analisa DMA menunjukkan bahwa PF-NaOH-5% menghasilkan storage modulus yang tertinggi, diikuti dengan PF-CaCO3-1% dengan nilai yang tidak berbeda nyata. Keteguhan rekat yang paling tinggi adalah PF-CaCO3-1% dan terendah adalah PF-Kontrol ditunjukkan dengan tingkat kerusakannya yang berbanding lurus. Berdasakan hasil penelitian, penambahan CaCO3-1% pada perekat PF lebih efisien daripada NaOH-5%.
Keyword: fenol-formaldehida, katalis, NaOH, CaCO3, karakteristik

Judul: Studies on growth spurt and aging in higher primates
Abstrak: single measurement that best defines the health and nutritional status of children, just as it provides an indirect measurement of the quality of life of an entire population. The pattern of human growth reflects the biocultural evolution of our species. The human pattern of growth and development (ontogeny) appears to differ markedly from patterns of ontogeny in other primate species. Three studies are reported here which deal to the growth and development of human and chimpanzee (Pan troglodytes). These three studies allow us to contrast the phenomena of adolescence growth spurt and female elderly bone loss in chimpanzee and human as chimpanzee is the closest species to humans within extant nonhuman primates. In the first, a cross-sectional study of growth of the body size and somatotype of 363 Javanese girls and 299 Javanese boys aged 4 to 20 years from Magelang Regency, Indonesia was described. In the second, cross-sectional and longitudinal studies in the growth of chimpanzee second metacarpal bone linear dimensions from individuals aged 0 to 43.6 years were used for comparison. While in the third, cross-sectional and longitudinal studies in the growth of chimpanzee body size (body mass and anterior trunk length) and second metacarpal bone mineral content were derived. In measuring the second metacarpal dimensions and mineral content, a total of 568 radiographs of chimpanzee's proximodistal left hands were used. They were taken from 68 females and 49 males aged 0 to 43.62 years old. We applied an image analysis system, Scion Image Release Alpha 4.0.3.2 software for Windows to measure bone linear dimensions and bone mineral content. Humans present complex and sinuous growth curves for both body weight and height. A clear growth spurt could be demonstrated by cross-sectional analysis in our girl subjects at around aged 11.5 years and in our boy subjects at around aged 12.5 years. In longitudinal series, not in cross-sectional, several representative chimpanzees of both sexes showed a pre-adult growth spurt on the body sizes, bone dimensions and bone mineral content. They ranged at age 4.5 to 8.5 years. This underscore the fact that adolescent growth spurt in linear dimension was not a universal feature of anthropoid primate ontogeny. Bone loss is a well established characteristic of human female aging. Based on crosssectional analyses the sequential decline of bone mass in female chimpanzee may be said to be genuine. On the other hand, we found in adulthood through elderly, male chimpanzees show a longer plateau than female chimpanzee, that is, bone mineral content is maintained in male.
Keyword: Javanese children, growth spurt, chimpanzee, second metacarpal bone, bone loss, Higher Primates