| Nama Pengarang | : | Agnes Nora lska Harnita |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 143-150 |
| Abstraksi Narasi | : | Pili of enteropathogenic bacteria having hemagglutinin activity has been proved to be a colonization factor. It has been isolated a 48 kDa hemagglutinin protein from pili of V.cholerae 01 strain T79-6, but the role of a 48 kda protein in adhesion to the intestine has not yet been clarified. This report attempts to describe the role of 48 kDa protein in colonization. The result might provide information on the first step of V.cholerae pathogenesis. Antipilus polyclonal antibodies were prepared by immunizing chikens with 48 kDaprotein pili. This polyclonal antibodies were used to identify hemagglutinin protein of pili of V.chplerae. The result suggests that anti 48 kDa of polyclonal antibodies could recognize four protein of pili with molecule weight of 48 kDa, 36 kDa, 30 kDa, and 21 kDa. |
| Nama Pengarang | : | Irawati |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 81-82 |
| Abstraksi Narasi | : | Torsion module decomposition over integers as direct sum of its p-components, where p is a prime number, has been done by Wisbauer. In this paper, a more general result will be presented, namely torsion module decomposition over a Dedekind domain as direct sum of its P-components, where P is a prime ideal. |
| Nama Pengarang | : | Sangadji |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 83-89 |
| Abstraksi Narasi | : | Telah diketahui bahwa transformasi Berezin dapat digunakan untuk mengkarakterisir kekompakan operator-operator Toelipz dengan simbol-simbol radial pada ruang Fock dan ruang Fock harmonic. Dalam makalah ini dibahas dan dibuktikan bahwa transformasi Berezin juga dapat digunakan untuk mengkarakterisir kekompakan operator-operator Toeplitz dengan simbol-simbol radial pada ruang Fock harmonic tergeneralisir. |
| Nama Pengarang | : | Sumarno, Linggo |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 133-142 |
| Abstraksi Narasi | : | A filter bank consisting of a set of filters is usually used to separate signals into different frequency bands. If the filter bank consists of Finite Impulse Response (FIR) filters, FIR filtering can be implemented using signal segmentation. As a kind of signal segmentation, it has been proved that overlap-add method based on Discrete Cosine Transform (DCT) can be used for FIR filtering (Sumarno, 2000). In this paper, a simulation of FIR filter bank using overlap-add method based on DCT shows that FIR filtering can be implemented simultaneously in the filter banks. However, there are two special cases that must be taken into consideration i.e. ripple and signal attenuation in the pass band. |
| Nama Pengarang | : | YB. Lukiyanto |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 71-79 |
| Abstraksi Narasi | : | The problem of conduction heat transfer under unsteady state and three dimensional conditions with no energy generation or no heat sources can be solved by using finite-difference method. This article discusses a solution of the problem by using the Alternating Direction Implicit (ADI) method. |
| Nama Pengarang | : | J. J. Siang |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 41-49 |
| Abstraksi Narasi | : | Random number plays an important role in simulation programs. In this paper, random number generators in three softwares under DOS, i.e. Pascal (Turbo Pascal 3.0, 5.5, 7.0), Basic (Turbo Basic 1.0, Quick Basic 1.5, Power Basic 2.0), and C (Turbo C++ 2.0, 3.0 and Borland C++ 1.0) are evaluated and compared. The result shows that random number generated by the softwares studied are independent and uniformly distributed. However, Basic is too slow forsimulation purposes and C has a short period. Thus in general, Pascal is the best choice for asimulation program. |
| Nama Pengarang | : | YB. Lukiyanto |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 59-69 |
| Abstraksi Narasi | : | Fluid mechanics problems can be solved either mathematically, e.g. by separation of variable method, or numerically, e.g. by finite-difference method. Finite-difference method is a simple way of solving fluid mechanics problems in various geometric and boundary conditions. Using Point Successive Over Relaxation Method (PSOR) iteration, which is one of the finite-difference methods, it will be shown how to find the velocity distribution of fluid flowing through a simple canal with a vertical partition. |
| Nama Pengarang | : | Maria Dwi Budi Jumpowati |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 5-16 |
| Abstraksi Narasi | : | Bacterial plasma membrane is molecullary formed by the integral or trans membrane protein floating in a lipid bilayer, the peripheral proteins associated loosely with inner membrane surface, the hydrophilic ends of phospholipids, the hydrophobic fatty acids chains and other membrane lipids such as bacteriohopanetetrol or hopanoid. Due to this molecullary structure, bacterial plasma membrane is a highly organized and asymatric system, which is at the same time flexible and dynamic. Bacterial plasma membrane serves as a selectively permeable barrier: it allows particular ion and molecules to pass, either into or out of the cell. Transport systems can be used for such tasks as nutrient uptake, waste exretion or protein secretion. The most important characteristics or transport mechanism in bacterial cells are the facilitated diffusion and the active transport such as group translocation.Bacterial plasma membrane also contains special receptor which helps the bacteria to detect and respond to chemicals in their surroundings. The plasma membrane is thus very essential to the survival of microorganisms. |
| Nama Pengarang | : | Th. Prima Ari Setiyani |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 51-57 |
| Abstraksi Narasi | : | The fusion reaction of neutron and silicon atoms could produce an (n,alpha) reaction, creating two charged particles, i.e.alpha and magnesium, each of which has some amount of energy-deposit. These particles are moving in an unpredictable direction. If this reaction occurs on semiconductor devices, especially memory cells, the alpha particle spends its energy-deposit producing electron-hole pair along its path. In the sensitive area, if the electron-hole pair production induces a pulse higher than the threshold voltage, the cell`s state will be upset. The upset of the memory cell`s astate is called soft-error. This paper discusses the effects of alpha radiation and describes the soft-error mechanism. |
| Nama Pengarang | : | R. Soemantri |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 17-28 |
| Abstraksi Narasi | : | - |
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