Judul: Failure Analysis On Corrosion of Al-Zn Heat Reflector in Timber Dry Kiln
Abstrak: Al-Zn alloy coated steel sheet (JIS G3 141) was used as a heat reflector in timber dry kiln. After six months continuous service at 110 derajat celcius in moist condition, the heat reflector is corroded. Failure analysis method was used to analyze this corrosion phenomena. Macroscopic and microscopic examination with some characterizations have been performed to determine the elemental composition and corrosion products. The elemental composition of corroded heat reflector that were detected by SEM-EDS are sulphur, chloride, calcium, sodium and potassium. XRD analysis revealed the zinc aluminum carbonate hydroxide hydrate (Zn6Al2(OH)16CO3.4H2O) black rust staining and iron oxide (FeFe204), as corrosion product. Environmental condition in timber dry kiln with the existence of acid and alkaline elements make the corrosion process occur. Those elements came from the dried timber and steam that adhered on the heat reflector surface and they attacked the Al-Zn coating and base metal. The humidity and high temperature in timber dry kiln environment are factors that increase the corrosion rate of the heat reflector.
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Judul: Kinetika dan Termodinamika Korosi Logam Cu dan Inhibisinya oleh Zink (Disikloheksilditiofosfat) dengan Teknik Polarisasi Potensiodinamik
Abstrak: Zinc dialkyldithiophosphates (ZDTP) is a lubricant additives which has many functions such as anti-friction, anti-wear, antioxidants, and anti-corrosion. In this research, ZDTP type which was made is ZDTP with alkyl cyclohexyl group (ZDTPS). The yield of ZDTPS were 83.50% and 82.10%. Inhibition effectivity of zinc dicyclohexyldithiophosphate were 94.30% in concentration 3% and increase significantly in concentration 1%. The parameters of thermodynamics was measured to show the easiness of corrosion reaction occur. Themodynamics parameters of blank revealed ΔH∗ was 26.8583 kJ/mol, ΔS∗ was -150.4102 J/molK, and ΔG∗ was 72.4295 kJ/mol. Thermodynamics parameters of ZDTPS revealed ΔH∗ was 50.0563 kJ/mol, ΔS∗ was -79.9807 J/molK, and ΔG∗ was 74.2963 kJ/mol. Activation energy from the corrosion process with ZDTPS presence was 52.6509 kJ/mol. This value is bigger than energy activation of blank with the value was 29.4548 kJ/mol.
Keyword: Bogor Agricultural University (IPB), ZDTP, thermodynamic, polarization, kinetic, inhibition effectivity

Judul: Inseminasi buatan pada primata non manusia
Abstrak: Inseminasi buatan pada primata merupakan salah satu cara untuk meningkatkan populasi primata, agar hewan tersebut dapat dicegah kepunahannya, selain itu untuk kepen- tingan biomedis pada kedokteran manusia. Pubertas pada monyet betina terjadi kira-kira pada umur 2 sampai 4 tahun, sedangkan pada kera kira-kira pada umur 2 sampai 8 tahun. Menstruasi pertama terjadi pada umur 2,5 sampai 4 tahun pada monyet dan 9 tahun pada kera. Lamanya siklus menstruasi berkisar antara 28 sampai 35 hari dengan waktu ovulasinya terjadi kira-kira pada per- tengahan siklus menstruasi yaitu antara hari ke 11 sampai ke 15, pada saat inilah waktu yang tepat untuk melakukan. inseminasi buatan. Tehnik yang paling efisien dalam pengumpulan semen adalah dengan cara elektroejakulator, sedangkan metode. inseminasi dapat dilakukan secara intravaginal, intrasertival, intrauterin dan intraperitoneal. Inseminasi buatan dengan semen beku sudah berkembang di negara-negara maju, karena semen monyet yang kaya akan sperma dapat diencerkan dan dibekukan secara bertahap.
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