This study examined the effects of powder types on capillary pumping performance and wettability of wick samples. The raw material used are molecular sieve and copper powder with grain size of 80-100 microns and 177-2...
This study examined the effects of powder types on capillary pumping performance and wettability of wick samples. The raw material used are molecular sieve and copper powder with grain size of 80-100 microns and 177-200 microns respectively. Wick samples were produced by sintering with two shapes of powder grain comprised spherical and irregular shapes. Tests were carried out to determine the microstructure of the sample, capillary pumping amount and wettability. The test results showed that the grain type and grain size of powder could affect the roughness of the samples, of which, consequently, could also influence their wettability and capillary pumping amount. Proposed grain size and shape of the molecular sieve and copper powder are potential to be considered as wick alternatives for heat pipe application.
DOMERAPI project has been conducted to comprehensively study the internal structure of Merapi volcano, especially about deep structural features beneath the volcano. DOMERAPI earthquake monitoring network consists of ...
DOMERAPI project has been conducted to comprehensively study the internal structure of Merapi volcano, especially about deep structural features beneath the volcano. DOMERAPI earthquake monitoring network consists of 46 broad-band seismometers installed around the Merapi volcano. Earthquake hypocenter determination is a very important step for further studies, such as hypocenter relocation and seismic tomographic imaging. Ray paths from earthquake events occurring outside the Merapi region can be utilized to delineate the deep magma structure. Earthquakes occurring outside the DOMERAPI seismic network will produce an azimuthal gap greater than 1800. Owing to this situation the stations from BMKG seismic network can be used jointly to minimize the azimuthal gap. We identified earthquake events manually and carefully, and then picked arrival times of P and S waves. The data from the DOMERAPI seismic network were combined with the BMKG data catalogue to determine earthquake events outside the Merapi region. For future work, we will also use the BPPTKG (Center for Research and Development of Geological Disaster Technology) data catalogue in order to study shallow structures beneath the Merapi volcano. The application of all data catalogues will provide good information as input for further advanced studies and volcano hazards mitigation.
Rubber commodity is one of the superior commodities in South Sumatra. The main problem of the rubber industry that remains unsolved is that the product has a low quality due to poor handling of its raw material. Most ...
Rubber commodity is one of the superior commodities in South Sumatra. The main problem of the rubber industry that remains unsolved is that the product has a low quality due to poor handling of its raw material. Most farmers, in South Sumatera, often uses coagulant that are not recommended, namely sulfuric acid or para vinegar, alum, TSP fertilizer, a combination of para and alum vinegar, and others such as yam, and tempe washing water. Para vinegar, TSP fertilizer, alum and pineapple/ pineapple juice are acidic which cause smells of ammonia and sulfides. The liquid waste generated in the material process pollutes the environment if it is not properly intervened. Material handling in a rubber factory causes several illnesses for workers. However, the correlation of pollutants with these illnesses are not yet and become the focal point of this report.
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