Judul: Design and Performance Test of Dustfall Measurement Instrument
Abstrak: Dustfall is one of the ambient air quality parameters based on Government Regulation No. 41/1999 pertaining on Air Pollution Control. The conventional dustfall measurement system practiced today still needs to be improved in order to simplify the measurement technique in the field and to shorten analysis time in the laboratory. The purposes of this research were to: a) to design and develop a simple, practical, and economical dustfall measurement instrument, b) to carry out performance test of dustfall measurement instrument and to analyze the results of field measurements in several different location. Dustfall canister was developed based on polyvinyl chloride (PVC) material which was then connected to the filter house. Filter stabilisation chamber was developed by using acrylic and steel as casing material, and equipped with a closed-loop temperature control system based on PID (proportional-integral-derivative). The results showed that the design of dustfall canister had been able to shorten the sample analysis time in the laboratory. The new developed system allows direct insertion of dustfall filter followed by weighing step which in turn could shorten analysis time. Another result obtained was that the stabilisation chamber control system had showed a well function to set a temperature point. The performance of PID control system produced a stable temperature regime in the stabilisation chamber during the process of filter stabilisation. The test results showed that acrylic materials were relatively less safe for the filter stabilisation chamber due to lack of heat resistance, while the steel metal was more secure and subsequently selected as the final structure of the material. The results also indicated that the filter drying could be done within three hours. With this system, the overall measurement of dustfall in ambient air can be simplified. The field measurement showed that human activities and the use of fossil fuel vehicles affected the concentration of dustfall in the air. Density of vegetation also affected the concentration of dust fall in the air
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Judul: Bangkitan Debu Jatuh dan Total Partikel Tersuspensi Akibat Pengaruh Lalu Lintas
Abstrak: The increasing vehicle usage contributes to the rise of dustfall (DF) and suspended particles (TSP) concentration. The purpose of this study was to measure the generation of DF and TSP due to the number of vehicles (JK) and to analyze their correlation. This study was conducted on four roads,namely Ciomas, Dramaga,Sindang Barang and RE Abdullah roads. The study was conducted by installing dustfall canister for 24 hours.High volume air sampler was operated for 60 minutes simultaneously with traffic counting. The DF generation at four sampling points were less than 1 ton/km2.month. The range of TSP generation on Ciomas, Dramaga, Sindang Barang, and RE Abdullah were 57-243, 37-86, 37-177, 60-117 μg/Nm3 respectively. The significant value (α) between DF generation and JK type I in the morning was 0.037, type II in the morning was 0.002, type III in the morning was 0.031, type III was 0.001 in the night and type VI b was 0.009 The significant value between TSP generation and type III in the night was 0.002, type III total was 0.001, type VI a was 0.04 and type VI b was 0.019.
Keyword: vehicles., traffic, suspended particulate, correlation, dustfall

Judul: Kawin Berulang Pada sapi, Kausa Kuman Aspesifik Dan Pengobatannya
Abstrak: Kawin berulang pada sapi betina adalah merupakan bantuk atau geja1a inferti1itas, dimana sapi-sapi yang menderita kawin beru1ang tersebut mempunyai siklus berahi yang normal atau hampir normal dan sudah dikawinkan dua ka1i atau 1ebih dengan pejantan atau semen pejantan fertil, tapi tetap belum bisa bunting. Pemeriksaan klinis terhadap sapi tersebut tidak memberikan gambaran tertentu yang dapat menerangkan kegaga1an konsepsi yang dialami (Roberts, 1971).
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