Judul: Kajian Pengaruh Suhu terhadap Densitas dan Sifat Reologi Minyak Sawit Kasar (Crude Palm Oil)
Abstrak: Indonesia is the largest CPO producer in the world. Production of CPO in Indonesia increases in each year. Increasing of CPO production must be balanced with the development of its transportation systems. One of the efficient transportation system of CPO is pipeline transportation. On this pipeline transportation, density and rheology is a crucial parameter for pipeline design calculation and simulation of its momentum transfer process and system. The aim of this research was to get data of the density and rheological properties of CPO on different temperature. The samples used in this research were obtained from four different factories of palm oil in Indonesia. The density was measured by AOCS 1997 method and the rheological properties of CPO was measured by Haake Rotoviscometer RV20 (Karlsruhe, Germany).The results showed that the temperature influenced on density and rheological properties of CPO. Density decreased with increasing of temperature. The flow behavior index (n) increased with increasing temperature but the consistency index (K) and apparent viscosity of CPO decreased with increasing of temperature. Generally, CPO exhibited a pseudoplastic behavior at temperature of 25-40oC and a Newtonian behavior at temperature of 45-55oC.
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Judul: Characteristics of crude palm oil and their control techniques design to support the development of pipeline mode transportation
Abstrak: Indonesia is the largest producer and exporter of crude palm oil (CPO) in the world. CPO usually transported from palm oil factory to the storage tank by using tank truck. This mode of transportation is less efficient, and should be replaced by more efficient mode of transportation such as pipeline mode. Engineering principles must be applied in CPO’s pipeline mode transportation, which need basic data related to flow properties of CPO. This research was conducted to obtain basic data on the characteristics of CPO related to flow properties, and also to design their control techniques in order to support and strengthen the engineering approaches for the development of pipeline mode transportation of CPO. The research consisted of (1) study on CPO’s quality and physical properties; (2) study on the effect of temperature on physical properties of CPO; (3) study on rheological and crystallization properties of CPO in dynamic conditions; and (4) study on control techniques design of CPO’s pipeline mode transportation. CPO samples had variety on their quality attributes dan physical properties. There was good correlation between iodine values of CPO to the rheological properties of CPO at 25°C. Density, solid fat content (SFC), and rheological properties of CPO were influenced by temperature. Method of temperature preconditioning, determined the rheological properties of CPO. The flow properties of CPO samples equilibrated for 24 hour has shifted from Newtonian behaviour (detected in 55 to 45 oC) to become pseudoplastic (detected in 40 to 25 oC). CPO samples without equilibration with cooling rate from 55 oC to the measurement temperatures, had Newtonian behaviour until temperature of 30 oC. Temperature cycles in the rate of 1oC/minute between 25-55 oC affected the entalphy, SFC, and apparent viscosity () reversibly. Cooling rate and shear rate from 55 oC to 30 oC had no influence on  as long as the temperature of CPO were not reach isothermal conditions, with maximum  in 30 oC about 60 mPa.s. Study on CPO flow by using circulated pipeline in isothermal conditions showed that non-isothermal condition below its melting point (TM) must be controlled for maintaining low  of CPO. Rheology and crystallization properties of CPO can be controlled along the pipeline by using two flow systems: (A) isothermal flow system for transporting CPO in short distance in any temperature above 40 to 55 oC maintained by insulation system; and (B) non-isothermal flow system from 55 oC to the minimun temperature of 30 oC before isothermal condition, for transporting CPO in long distance, which controlled by insulation system and some heating stations in several points along the pipeline. Data of CPO’s characteristics and their control techniques design resulted from this research is very useful for the development of CPO’s pipeline mode transportation.
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Judul: Psittacosis Sebagai Zoonosis Penting Yang Berasal Dari Burung
Abstrak: Psittacosis atau ornithosis adalah penyakit menular dari burung kepada manusia. Agens penyebab psittacosis termasuk ke dalam virus psittacosis-lymphogranuloma venereum group yang disebut Chlamydia psittaci. C. psittaci hanya dapat berkembang biak di dalam jaringan hidup tetapi peka terhadap antibiotik. Penyebaran penyakit ini sangat luas, terdapat hampir di seluruh dunia. Di Indonesia penyakit ini belum pernah di diagnosa, tetapi mengingat terdapat demikian banyaknya jenis burung maka diperkirakan psittacosis ini sudah ada. Kasus pada manusia pertamakali ditemukan oleh Ritter pada tahun 1879, di Eropa. Waktu itu dikenal sebagai pneumotyphus. Chlamydia psittaci tidak hanya sebagai penyebab infeksi pada burung, juga bisa menyebabkan infeksi pada mamalia diantaranya sapi, kerbau, kambing, domba, babi dan kucing. Pada kucing dikenal sebagai feline pneumonitis. Pada domba atau kambing mengakibatkan enzootic abortion. Pada burung, kalkun merupakan unggas paling rentan diikuti oleh burung psittacine dan burung lain di luar famili psittacidae. Virulensinyapun berbeda-beda. Yang berasal dari kalkun bervirulensi tinggi, sedangkan yang berasal dari burung merpati bisa bervirulensi tinggi bisa juga bervirulensi rendah. Penularan terjadi melalui kontak langsung maupun ti- dak langsung. Penularan melalui telur tidak terjadi. Umumnya penyakit ini memperlihatkan gejala klinis berupa deman, lesu, lemah, anorexia, kurus, diarrhea ber- warna kekuningan, discharge dari mata dan hidung, conjunc- tivitis. Gejala khas pada kalkun adalah istirahat dengan sternum sebagai dasarnya, karena adanya tekanan dari bagian perut yang sakit. Sedangkan pada manusia memperlihatkan adanya demam, kadang-kadang merasa dingin, lesu, sakit kepala yang hebat, sakit pada bagian belakang badan dan photophobia…dst
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