| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 104-113 |
| Abstraksi Narasi | : | The complexes were prepared by adding 8-hydroxyquinoline solution into an aqueous solution containing Co^2+ or Cu^2+ metal ion. Condition for the formation of the complexes were studied at various pH, and the stoichiometric formula of the complexes were determined spectrometrically by using continuous variation method. The results showed that the optimum formation of the Co(II) complexes were achieved at pH 9, 8, and 11 in dichloromethane, chloroform, and carbon tetrachloride respectively. Similarly, the Cu(II) complexes were achieved at pH 3, 4, and 3 respectively. The complexes were obtained in this work were [bis (8-hydroxyquinolinato) cobalt (II)] and [bis(hydroxyquinolinato) copper (II)]. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 98-103 |
| Abstraksi Narasi | : | The purpose of the research is to find the optimum condition for sinthesizing nitrate cellulose from onggok mixed with nitrate acid when sulplate acid used as catalysator. Onggok is solid waste from starch industry. It contain celluloic fiber 21.92% starch 60.60% protein 0,80%, Ash 0.51, fat 0,25% and water 14.32. Based on diphenilamin test, film performance and solubility testing, the optimum condition for reacting 2.5 gram onggok was reached if there was used 35 ml nitrate acid as catalysator, 30 ml sulphate acid and the onggok particle size were- 85--+100 mesh. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 32-43 |
| Abstraksi Narasi | : | A study on gene variation between two populations of catfish (Clarias batrachus) from the Musi river and Bengawan Solo has been conducted to determine the allelic variations netween the two population samples. Each of 40 sample were collected from natural habitat and analized using electrophoretic analysis. Two kinds of tissue (muscle and liver) were assayed and stored at-24C until used. Starch gell electrophoresis was used to determine the frequency of alleles in both populations. The work was done at Gondol Research Station of Center Research Institute of Fisheries, Bali. The result showed that both Catfish populations in the Musi river and Bengawan Solo have the low heterozigozity (H) 0.029-0,167. Among the two population samples the genetic variation of this fish are being quite low. The results suggest that Clarias batrachus has been domesticated for many years or the populations has reduced to a small number due to environmental stress. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 50-54 |
| Abstraksi Narasi | : | A research on shope memory alloys, TiNi Which is aged for one hour at 550, 650, 750 and 850 C for an hour for each sample. The treatments are tested to produce new phases of shape memory alloys. The new phases precipitated in the alloys were observed using SEM method. The results showed that a martensite phase was formed during aging treatment at 650 and 750 C. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 114-119 |
| Abstraksi Narasi | : | This research was conducted to study the effect of additive on photodegradation of polyethylene film exposed to sunlight for six weeks. The additive used is benzophenon with three levels of concentration of 1, 2, and 3 %. The photodegradation was measured after the films being exposed for 2, 4, and 6 weeks. The occurrence of photodegradation was detected from the build-up of carbonyl and hydroxyl groups using infrared spectrophotometer. The level of photodegradation was measured by monitoring the decrease of the transmitance (%T) of carbonyl group absorption band centered at 1710-1720 cm^-1 and at 3600--3610 cm^-1 for hydroxyl group. The results showed that both additive concentrations and exposure times affect the level of photodegradation strangly. The higher the concentration of additive, the stronger the photodegradation. The same trend was obtained for exposure times. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 86-91 |
| Abstraksi Narasi | : | The research analyzed three directions of seismic data of volcanic earthquake of Krakatau mountain. The seismic data were recorded by three components of portable seismometer. The results showed that there were the seismic signal namely power spectrum, particle motion, and filtered-reduction signal. Krakatau mountain had a low frequency earthquake and unsteady position sources. For the moment it could be judged that seismogram did not certainly caused by volcanic earthquake. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 76-85 |
| Abstraksi Narasi | : | The relaxation characteristic of a materials is a process of being weakened the materials during a long period caused by any loading. This research was expected to be able to express the behavioral secret of materials and determine the characteristics of relaxation in order to become a part of contribution in arranging a construction, especially those being used in a long time. The data of this research were collected by observed and recorded to become characteristic of the material. The materials chosen in this research ware acrylic, nylon and polythylene that being conditioned in a high temperature, and was loaded until having a certain strain an it was kept to be constant during the experiment, then the stress relaxation of those materials were studied. The characteristic of relaxation of certain material was then formulated in the form of a semi-log graph, finally the characteristic showed that the acrylic and nylon give the solution in the form of curve that close to standard relaxation curve for three situational changes, while the polyethylene was showing little away from standard curve during the process of stress decreasing. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 1-14 |
| Abstraksi Narasi | : | Regression analysis is one of the method of analysis which is used a lot in economic. This paper will discuss the application of the regression analysis in economic, in particular, in the modelling of consumption function. Some examples will be discussed in this paper. |
| Nama Pengarang | : | Robet Asnawi, Ratna Wylis Arief, Lies Maria Hamzah, Sugiyanto, Suharno, Wahyudi, Amir Supriyanto, Wasinton Simanjuntak, Pulung Karo Karo, Wartono Hadie dkk, John Kendri, Nina Kadaritna, R.H. Rusli, Ronnie H.R., Robet Asnawi, Ratna Wylis Arief, Aspita Laila, Endang Nurcahyani, E. Herda, Rumyati |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 21-26 |
| Abstraksi Narasi | : | Analysis of black pepper oil and piperin of sixteen varieties of black pepper grown at the Natar Experimental Garden was conducted at Bogor Research Intitute for Spices and Medicinal Crops on December 1995. The result of analysis showed that Johor Getas variety result in the highest black pepper oil content. Among varieties by Petaling 1, and piperin content produced by Natar 2. Varieties of Cheriakhaniakhadan (CHKK) has low production of black pepper oil and piperin content. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 241-249 |
| Abstraksi Narasi | : | The secondary successions study was done on Pananjung Pangandaran Nature Reserve. The objectives of the study were to elucidate the progress of vegetation secondary succession of grazing area. Method of the study was plot sampling. The sample stands were subjectively determined and the sample plots were selected haphazardly on each area. Comparison was employed among sampling locations namely Cikamal (A), Nanggorak (B) and Badeto (C). The results of the study showed that Cikamal area has the lowest degree of succession level, Nanggorak has intermediate, and Badeto showed most advanced. Analysis of variance and t-test was done to evaluate the difference of diversity index and edaphic parameters. Ordination analysis was done to reveal the ordering pattern of sample stand. Correlation between the ordination pattern and environmental parameters was determined by superimpose. The result of the study indicated that the succession process is showed by the progress development of community structure and species composition. The diversity index of herb, shrub and tree strata were increasing from Cikamal to Badeto area. In Nanggorak and Badeto the development of tree strata were more significant than in Cikamal. The ordination pattern of stand for herb and shrub have correlation to soil carbon content, organic matter and N-total, whereas tree strata did not have clear correlation. |
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