| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 86-95 |
| Abstraksi Narasi | : | The study of stocking densities effect on the growth of Tiger prawn (Penaeus monodon) juveniles reared in the nursery of brackiswater ponds was conducted in South Lampung District, from April to Mei 1999. The experiment was design used statistical method of "t test" with three stocking density treatments: 50, 100, and 150 individuals/M^2 with two plots replication. The postlarval P. monodon used in this experiment were 12 days old and an average total lenght of 11 mm with rearing was 21 days. The size of experimental brackishwater ponds was 5 x 50 M^2. The results indicated the average total length was 23.5-26.0 mm, and the average of survival rates was 81.5-86.5%. The water quality during the experiments showed that: salinity ware 30-35%, water temperatures were from 25-32`C, ph were 7.5-8.0, ammonia was < 0.1 ppm, nitrite |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 215-225 |
| Abstraksi Narasi | : | This research is an introduction study only and intend to get the optimum condition in preparation of composite, with limits are the variation of composition of composite, contact time of catalyst with composite and concentration of TiO2. Mixing method of skim rubber with activated carbon of coconut shell carried out preparation of activated carbon composite. Composite supported TiO2 catalyst was prepared by impregnation method. Impregnation of TiO2 was carried out through TiCl4 in methanol as substance precursor. Characterizations of composite/TiO2 were carried out by measuring it`s chemical and physical parameters, such as acidity of composites, adsorption power in iodium, surface area and morphology of composite (SEM). The result of the research showed that optimum condition of composition of activated carbon -skim rubber composites is 5.00:2.25 (w/w), and concentration optimum of TiO2 is 30 ppm, and contact time of catalyst with composite is 20 minutes. The resulting composite/TiO2 is not better than pure activated carbon. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 122-130 |
| Abstraksi Narasi | : | Resemblance between relatives is a major importance in plant breeding to minimize the frequency of off type plants. Studies on the resemblance between relatives may be hampered by a great population size per unit area, segregation due to complete or semidominance and the presence of epistasis, and bias due to genotipe x environment interaction which can not be disregarded. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 109-113 |
| Abstraksi Narasi | : | Study on many species of commercial rattans has been done in 6 districts in Lampung Province. This research was conducted by conducting survey to the locations of rattan industries in West Lampung, Middle Lampung, South Lampung, North Lampung, and Bandar Lampung. The results showed there are 8 species of 2 families of rattans that are commonly used in rattan industries. These rattans were obtained from Palembang, Jambi, Riau, Suralangan, Kota Agung, and Rumbia. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 96-108 |
| Abstraksi Narasi | : | A study of some biolimnological aspect to support fish production on Rabau Lake in Lampung Province was conducted on December, 1999. The result of water quality test showed an mcrease water temperature 24-31 `C, light intensity 110-145 cm, pH 7.0-8.5, ammonia < 0.01 ppm, nitrit < 0.01ppm, oxygen 0.4-2.6 ppm, total alkalinity 81.4-124.4 ppm, and phosphate 0.4-2.6 ppm. The phyto plankton found consist of twenty two species and zooplankton consist of three species. The ranau lake waters is oligotrophic and potential area for fish culture development with floating cage culture technology. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 293-301 |
| Abstraksi Narasi | : | The present research was conducted to experimentally prove that the mechanical properties as impact resistance, abrasion resistance, tensile strength, and ductility of concrete would significantly increase when the certain amount of local fibers are added into the concrete mix. The possible aplication of the improved mechanical properties of the fibrous concrete to pavements and floor slabs is studied. The local fibers weight was added into the mix as much as 36 kg and 70 kg per cubic meter of concrete respectively, with aspect ratio lf/df = 75. The speciments of each concrete mix wereformed of three cylinders of 100mm x 200mm for compression tests, three cylinders of 100mm x 200mm for splitting tensile tests, three cylinders of 150mm x 63mm for impact tests, and three blocks of 50mm x 50mm x 30mm for abrasion tests. Both compression Testing Machine respectively (ASTM Standard C 39, C 496), the impact resistance was tested with Drop Weight Test Method (ASTM Standard D 1557-70), and the abrasion testing used Rotating-cutter Drill Press (ASTM Standard C 799). Based on the test results, it was conluded that: (10 the adding steel fibers into concrete mix do not increase of compression strength, but the tensile strength, impact resistance, and abrasion resistance increase respectively, while the fibrous concrete material was more ductile, and (20 the fibrous concrete was very suitable used for material of pavement structures because it gave both highdurability and economic. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 309-316 |
| Abstraksi Narasi | : | A home hold-scale tapioca (ITTARA MINI) prototype II has been operated at Poncowati, Lampung Tengah. Its performance was not well. It had the same weakness as components are engine power, engine seat. long and seat of sieve, sendimentation trap, wahser, and structure dimension. Objectives of this research was to modify the processing machine of small scale industry to suitable machine and high capacity. The result showed that the home-hold scale cassava milling machine had capacity of screw of 150-200 rpm. The performance of machine was strong and stability. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 114-121 |
| Abstraksi Narasi | : | Research on nitrogen removal from tahu-industrial wastewater was carried out by using a set of lab-scale reactors consisting of two stages of treatment; anaerobic filter and aerobic activated sludge process. The objective of this research was to evaluate the mechanism of nitrogen removal in the experimental reactors. Result showed that total Kjeldahl nitrogen (TKN) concentration decreased consistently in all stages of treatment, the highest reduction efficiency was 93% in trial III (with recirculation). Ammonium Nitrogen (NH4-N) increased in the anaerobic filter (stage 1), dropped in the aerobic activated sludge (stage 2). Nitrate nitrogen (NO3-N) decreased in the anaerobic filter (stage 1) and increased rapidly in the activated sludge (stage 2) indicating that nitrification worked very well. The use of re-circulation proved that denitrification worked very well in the anaerobic filter reactor. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 281-292 |
| Abstraksi Narasi | : | The Calculation of the Bouguer anomaly terrain correction the aduautage has been a tedious task with high manhour cost. With advent of digital computers, geophysicists have easily adapted earlier methods to produce algorithms to calculate the terrain correction. The Fortran language program described here is based, with some variants, on the model proposed by Kane (1962) and Balina (1989), The Fortran language program presented here was written for Pentium 120 computer, and it was successfully applied in a Merapi and Merbabu mount in Central Java, where it used a 120 x 120 km matrix and 366 station. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 226-233 |
| Abstraksi Narasi | : | Antitrypsine (Trypsine Inhibitor Complex), found in raw soybean, is an inhibitor of trypsine enzyme to hydrolyse protein become amino acids which cn be ready to be absorbed. To reduce or omit the activity of antitrypsine, can be done by boiling and fermentation. This research focuse on differences of antitrypsine activity reducing in soybean tempe caused by bioling and fermentation. The results shows that the length of boiling give better than fermentation in reducing antitrypsine activity. Length of boiling is best on 45 minutes, while the length of fermentation is 60 hours. |
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