| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 250-253 |
| Abstraksi Narasi | : | This research was conducted to investigate the influence of age and varieties of coconut water as natural media on the growth of Bacillus thuringiensis var. israelensis. The growth of the bacteria was expressed in multiplied number of vegetative cells. The research was carried out in Microbiology laboratory, Lampung University, December, 1997, by using Complete Randomized Design with 7 treatments, consist of 3 kind of ages and 2 varieties of coconut, and the nutrient broth, the artificial media, as control. The results of showed that different in kind of age and varieties of coconut water as media influenced multiplied of bacteria cells. The water from young coconut of green color was the best natural media for the growth of the bacteria. The water of coconut better than nutrient broth, the artificial media for all bacteria species. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 225-232 |
| Abstraksi Narasi | : | The effects of electric and magnetic fields of a 500 kV extra high voltage (EHV) transmission lines of fertility of male mice (Mus musculus) have been studied. Fifteen males were kept nearby EHV transmission lines (treated mice, S) and the other 15 males were kept away from EHV transmission lines (control mice, K) for 35 days. To test the fertility both K and S mice were mated with 11-week-old normal females. The results revealed that the implantation number and litter size of S mice were significantly lover than those of K mice, the live-birth indices were not significantly different, while mating ability as well as gestation indices were similar. It can be concluded that treated mice (S) tend to be less fertile than those of control mice (K). |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 153-161 |
| Abstraksi Narasi | : | A nitrogen ion implantation to the surface of AISI H13 Steels has been carried out using an ion implantation machine at various ion dose and energy. The changes in micro structure, and its compositions were tested by means of Optical Microscope or Scanning Electron Microscope (SEM) and Energy Disversive Spectroscopy (EDS) respectively. From micro structure analysis using optical or electron microscope, it was seen that the formation of iron nitrida is indicated by white layer about 5960 A near the implated surface. While from EDS analysis, it also could be shown that at the optimum condition the nitrogen ion concentration was about 0,087% weight or 0,334% atom. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 172-181 |
| Abstraksi Narasi | : | Zeolite is a porous solid material that has can be used as an adsorbent, molecular sieves, ion exchange and catalyst. Zeolite with an open pore are filled by water molecule, alkaline and alkaline earth elements and also non-zeolite impurities that reduce adsorption capacity. To increase the adsorption capacity, the zeolite should be activated. In this research, activation of Lampung zeolite from Sidomulyo, Lampung Selatan is performed with sulphuric acid and high temperature treatment. Activation performed by considering two variables; temperature variation range from 100-500 C for 120 minutes heating times with interval of 50 C and heating time variation from 30-300 minutes at optimum temperature, with 30 minutes interval. Effect of sulphuric acid concentrations range from 0,01 to 1,0 N, stirring times range from 30 to 60 minutes and percent weighs of soild range from 5 to 15 %. To investigate the effect on surface area, methylene blue chloride solution was used, while for structure ascertation, the X-ray diffraction analyses was performed. The activation of Lampung zeolite with temperature at a 300 C for 120 minutes increase the amount amonium ion adsorbed, from 7,24 to 7,71 ppm/g and the surface area increase from 44,53 to 51,85 m^2/g. The results showed that the optimum activation condition can be obtained with 0,25 N sulphuric acid, 40 minutes stirring time and 7,5% (W/V). Adsorption capacity increased from 0,545 mg amonium ion/g zeolite to 0.606 mg amonium ion/g zeolite and the surface area also increased from 44,53 m^2/g. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 197-201 |
| Abstraksi Narasi | : | To choose of the best model in multiple linear regression for quantitative data can utilized a stepwise method that is depend on three criteria: Adjusted R-square, Mallow coefficient (C(p)) and Mean Square Error values. Based on these three criteria the best model can be obtained. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 162-171 |
| Abstraksi Narasi | : | CdS thin film has been prepared by Cd and S co-evaporation. Analysis of the film properties was performed by x-ray diffraction, UV-VIS Spectrophotometer and resistance measurement. The properties of the film are influenced by several parameters such as substrate temperature, source-substrate distance as well as CdS and S source distance. X-ray diffraction analysis yields that the film has preferred orientation on (002) plane and hexagonal structure. Heat treatment applied to the film at 200 C during deposition enhances grain boundary, refraction index, and semiconductor properties. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 203-205 |
| Abstraksi Narasi | : | A topological space X is said to be paracompact if it is fulfil Hausdorff and if every convering has an open refinement which is locally compact Hausdorff space X is the countable union of compact sets, then X is paracompact. As a result a locally separable compact Hausdorff space is paracompact. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 190-196 |
| Abstraksi Narasi | : | One of the most important step in analysing and interpreting environmental data is the selection of brobability models or statistical models. In addition to guiding on data analysis, probability models could give a simple illustration of several situations of data distributions. The objective of this article is to discuss how to estimate parameters of probability density function of weibull, gamma, and lognormal by using maximum likelihood method and how to choose the "best" distributions in fitting environmental data. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 206-215 |
| Abstraksi Narasi | : | This paper discusses the steps and its interpretation of one of the most important part of statistical inference, namely estimation of parameter. The paper discusses the rational of estimation of parameter; the point estimation and interval estimation. Also, discusses the weakness of the point estimation compared to interval estimation, the steps to construct the interval estimation and its interpretation. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 182-189 |
| Abstraksi Narasi | : | The purpose of the research is to investigate the working of platium wire coated with cellulose acetate containing immobilized glucose oxidase enzyme, based on the reaction: This research used standard glucose solution and an Ag/AgCl as a reference electrode. The results showed that the glucose solution at 10^-4M - 10^-1 M as a glucose oxidase enzyme (GOD) electrode give respon time less than 5 minutes with Nernts factor 29.65 mV per concentration decade and linearity 0.9635. Life time of the electrode enzyme was 45 days with cellulose acetate electrode increased the rate of oxidation of glucose. When the electrode is not being used, it is storage in buffer solution at a solution pH 5.6 and the temperature at a 4 C. |
Unduh Dokumen Berkas PDF Utama