| Nama Pengarang | : | Budi Purnama, Fahru Nurosyid, Nuryani , Kamsul Abraha, Agung Bambang Setio Utomo |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 135-143 |
| Abstraksi Narasi | : | The study and characterization of magnetic thin films Ni80Fe20 permalloy produced by electrodeposition technique have been done. The physical characterization includes structure surface layer by SEM and XRD along with magnetic characterization by VSM (Vibrating Sample magnetometer) and ratio magneto-resistance measurement. The SEM results indicated that homogeneous thin films increase with increasing thickness. Furthermore, XRD observation explained that thin films produced have face center cubic crystallin structure with hkl (111) plane orientation. Soft magnetic properties was showed from small coersive force value. Remanence calculation from hysteresis curve indicated its thickness dependent. Finally, the characteristic properties of resistance decreased value from magnetic field is showed by the magnetoresistance curve. |
| Nama Pengarang | : | I Made Dira Swantara |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 149-156 |
| Abstraksi Narasi | : | 7 ...-hydroxycholesterol has been isolated from Gelidium rigidum (Vahl.) Grev. The isolation was carried out using column chromatographic ethod with different eluent systems. The chemical structure of the compound was determined using spectroscopic methods including mass spectroscopy and several techniques of nuclear magnetic resonance spectroscopy (1H-NMR, 13C-NMR, and HMBC). Based on the analysis, it cab be concluded that the dihydroxysterol was cholest-5-en-3 beta, 7 .......or 7...-hydroxycholesterol. |
| Nama Pengarang | : | Mudjijana , Sudarisman, Ubaedillah |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 35-40 |
| Abstraksi Narasi | : | The characterization of DC53 cutting-tool steel treated using full-hardening and Toyota-diffusion processes has been studied. The result shows that those of Toyota-diffusion treated: (1) contain C, Si, Mn, Cr, Ni, Mo and V as much as 2.090, 03, 0.626, 1.093, 0,395, 7.868, 0.134, 2.09, and 0.3 percents, respectively, (2) contain tempered martensite layer on their surfaces of 13 µm thick, (3) have higher Rockwell-and micro-hardness compared to those of full-hardening process. |
| Nama Pengarang | : | Edi Joko Santoso |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 1-4 |
| Abstraksi Narasi | : | Polyclonal antibody was raised againts the 36 kDa subunit pilus hemagglutinin protein of Vibrio cholera El Tor Ogawa strain T79-6. This antibody was compared to one previously raised to the 48 kDa subunit in adherence inhibition studies. The adherence index (mean number of bacteria per enterocyte) of V. cholerae El Tor Ogawa strain T79-6 preteared with either polyclonal antibody was similar and decreased relative to that of untreated bacteria. Inhibition of adherence of bacteria may have a significant role in preventing further infection. |
| Nama Pengarang | : | Marlin Sanda, Linggo Sumarno |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 49-60 |
| Abstraksi Narasi | : | The purpose of this research is to recognize human speech using neural network. The human speech to be recognized consists of four Indonesian words, namely: `Maju`, `Kanan`, and `Kiri`. The neural network used is multilayer feedforward network trained using genetic algorithm. The patterns of speech were recognized by neural network after feature extraction based on spectrum estimation carried out. Simulation of the neural network gave recognition rate up to 74.25 %. |
| Nama Pengarang | : | Johanes Eka Priyatma dan Shinta Estri Wahyuningrum |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 75-84 |
| Abstraksi Narasi | : | The development of Automatic Javanese Character Recognizer (AJCR) has a pivotal role in preserving the Javanese culture. There are many important documents written in Javanese characters. Once we have the AJCR, we could effectively save and manage the documents digitally. There are many approaches to design an AJCR. One of the simplest approaches is using the n-tupel method. However, the n-tupel method has limitation in the matching proces since it requires absolute match between the input character and its templates. This paper presents an extension of the n-tupel method using fuzzy logic to automatically recognize Javanese characters, which are mostly written manually. This paper also shows how the Matlab Fuzzy Logic Toolbox could easily facilitate the computation of fuzzy logic based on the n-tupel method intuitively. |
| Nama Pengarang | : | Phebe Hendra dan Antonius Indra Prihastanto |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 15-23 |
| Abstraksi Narasi | : | The purpose of the study is to observe the occurrence probability of alteration of the renal function of white rat caused by the dewo fresh fruit subcronically. This study used completely randomized design with one way classification. The total examined subjects were 50 Sprague awley white male and female rats, aged 2 to 3 months, with 150-250g BW, randomly divided into 5 groups. Group I (as negative control) was given aquadest 22,05g/kgBW, while groups II-V were exposed by squeezed of the makuto dewo fresh ruit orally, once per day in 14 days with 1,41 g/kbBW; 8,82 g/kgBW; and 22,05 g/kgBW. The data observed were creatinine and renal`s histopathology. The results showed that the makuto dewo fresh fruit subcronicaly did not affect the renal function of white rats. |
| Nama Pengarang | : | Christine Patramurti |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 5-13 |
| Abstraksi Narasi | : | Octyl methoxycinamat and oxybenzon ussually formed in sunscreen. Those compound soluble in ethanol, that can not be separated by conventional extraction. The possible method to quantitative analysis of those compound were HPLC and spectrophotometry UV by applied on multiple wavelength. Accuration and precision of those method came from % recovery and % coefisien variancy. These research found that those method have a good accuration but rarely precision. |
| Nama Pengarang | : | lgn. Edi Santosa |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 67-73 |
| Abstraksi Narasi | : | A versatile CO laser has been built. The CO laser can be operated either in the delta v=1 or in delta v=2 laser wavelength region by a simple interchange of gratings. The holder for the gratings has four positions available. One can switch between them electronically or manually. A stepper motor is used to move the gratings in order to select the laser line. |
| Nama Pengarang | : | Maria Christina Reza Kartika Puspa Rinukti dan Aris Widayati |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 25-33 |
| Abstraksi Narasi | : | Research by the Indonesian Ministry of Health (2003) showed that 63% of the people use non-prescription drug. Fever is one of the symptoms mostly treated using non-prescription drug. Children are more vulnerable to fever than adults. As passive patients, children depend on their parents. Therefore, parent`s motivation and knowledge about fever and non-prescription drug play important roles. This study was conducted to investigate the relation between parent`s motivation and knowledge and usage of the drug for children in RW V Kelurahan Terban in 2004. The type of this study was observational with cross-sectional design. The main instrument of this study was a questionaire, consisted of 29 statements measured with 4 Likert Scales. Data were analyze by qualittaive as well as quantitative approach. Statistics method used was Pearson Product Moment correlation with 95% confidence interval. There were several points drawn from this study. Most respondents were informed by the pharmacist in a drug store to determine their choice of fever nonprescription drug (38,3%), motivation of using fever non-prescription drug came from themselves (85,5%), most respondents feel that the kind of informations they get were more than 5 items (72,7%), Bodrexin was the most popular brand (38,2%), most respondents buy the fever non-prescription drug in the nearest stall (63,3%). There was a positive (r = 0,489) and significant (p < 0,05) correlation between parent`s motivation and usage of the drug with medium level of correlation. Also, there was a positive ( r = 0,301) and significant (p < 0,05) correlation between parent`s knowledge and usage of the drug with low level of correlation. |
Unduh Dokumen Berkas PDF Utama