| Nama Pengarang | : | M.V. Any Herawati |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 29-33 |
| Abstraksi Narasi | : | Theorems on integration of sum and subtraction of two functions as well as scalar multiplication of functions are well known. However, there are no formulas to integrate multiplication and composition of two functions. This paper will be discussing integration of composite functions. |
| Nama Pengarang | : | Retno S. Sudibyo |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 1-4 |
| Abstraksi Narasi | : | Telah ditemukan satu daridelapan komponen minyak atsiri dari curcuma longa (kunyit) yang mempunyai bobot molekul sama dengan salah satu komponen lainnya tetapi mempunyai waktu retensi berbeda dalam khromato-gram dengan analisis secara gas chromatografik-mass spektrometrik. Analisis fragmentasi massa mendapatkan bahwa komponen tersebut adalah senyawa sikloheksen turmeron. |
| Nama Pengarang | : | Asan Damanik |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 35-40 |
| Abstraksi Narasi | : | The Pauli exlusion principle says that two or more electrons can not be in the same quantum state/number. This principle can be used to explain the multi electron atomic spectrum. But in particle physics, one can find composite particle which is composed of two or three fundamental particles (quarks) with the same flavor and spin in the same quantum state/number. Hence, the Pauli exlusion principle is violated. By using the symmetric properties of eigenfunction, however, the Pauli exlusion principle can be extended to cope with this situation. The extended Pauli exlusion principle can be stated as follows: The total eigenfunction of composite particle, composed of two or three fermions, should be antisymmetric with respect to the exchange of particles. |
| Nama Pengarang | : | Riyad Mubarak Abdullah and Kais lsmail |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 95-106 |
| Abstraksi Narasi | : | Dibahas perbandingan antara beberapa metode untuk memecahkan sistem linear Ax = b, yaitu Metode Faktorisasi LU, Metode Gradien Konjugasi, dan Metode Gelombang-singkat. Dari hasil penelitian ternyata bahwa Metode Faktorisasi LU adalah metode yang terbaik untuk semua jenis matriks, baik rapat, jarang, maupun segitiga. Metode ini adalah metode yang paling sederhana dan membutuhkan waktu perhitungan yang paling singkat. Untuk matriks rapat dan jarang digunakan Gelombang-singkat Haar, sedangkan Gelombang-singkat Meyer digunakan untuk matriks tridiagonal. Penelitian ini juga menunjukkan bahwa Gelombang-singkat Haar memberikan waktu eksekusi yang paling baik untuk semua jenis matriks. |
| Nama Pengarang | : | C. Kuntoro Adi, SJ |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 107-116 |
| Abstraksi Narasi | : | The convergence of mobile communications, computing and the Asynchronous Transfer Mode (ATM) gives rise to the Wireless ATM networks. While the ATM helps bring multimedia to the desktop, the Wireless ATM provides similar services to mobile computers and devices, and contributes seamless integration services into the Broadband Integrated services Digital Network (B-ISDN). In addition, the wireless ATM networks support fast handover, higher bandwidth, and mobile quality services.The need for seamless integration services into the B-ISDN/ATM networks, the presence of a quantitatively equivalent class of quality of service specification, the limitations associated with the existing mobile phone and wireless LAN systems, and the need to provide mobile multimedia services, mostly explain the desire for the Wireless ATM. |
| Nama Pengarang | : | Sri Agustini Sulandari |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 169-175 |
| Abstraksi Narasi | : | In classical linear optics it is assumed that the induced dielectric polarization of a medium is linearly related to the applied electric field. With the high electric fields involved in laser beams, the non-linear response leads to an exchange of energy between electromagnetic waves at different frequencies. One of the effects produced by a non-linear medium is the fact that the non-linear polarization term is proportional to the square of the electric field. This effect is called second Harmonic Generation (SHG), in which a laser beam at frequency w is partially converted, in the non-linear material, to a coherent beam at frequency 2w. This technique is currently being used to generate new coherent wave at different frequency from that of the incoming wave. |
| Nama Pengarang | : | FA. Rusdi Sambada |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 137-150 |
| Abstraksi Narasi | : | When a temperature difference exists between a plate and a stationary fluid, the fluid adjacent to the plate will move upward if the plate temperature is lower. Density gradients are set up in the fluid, resulting in buoyancy forces and free convective currents. The rate of heat transfer depends mainly on the fluid movement, but the orientation of the plate affects this movement. A horizontal plate restricts the fluid movement and thus reduces the rate of heat transfer, while a vertical one enhances the rate. |
| Nama Pengarang | : | Linggo Sumarno |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 127-136 |
| Abstraksi Narasi | : | Image filtering can be performed by using two-dimensional Finite Impulse Response (FIR 2D) filter in the time domain or frequency domain. In the time domain, it can be done directly by using convolution, whereas in the frequency domain indirectly by using two-dimensional Fast Fourier Transform (FFT 2D). Based on the separable property of Fourier Transform, 2D transformations can be realized by means of a succession of 1D transformations along each of the dimension axes. In this research we prove that image filtering can be performed using FIR 2D filter based on FFT 1D, by means of a succession of row and column processings. |
| Nama Pengarang | : | Maria Agustiani |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 161-168 |
| Abstraksi Narasi | : | A left module M over a ring R with unity is called semisimple if it is a direct sum of simple submodules, or equivalenty, if every submodule of M is a direct summand of M. The theory of these modules is basic to the study of noncommutative rings. A left module M over ring R is called very semisimple if every principal submodule Rm is simple where m = 0 =M. Every very semisimple module is semisimple, but the converse is not necessarily true. In this paper we characterize the conditions for the converse to hold. |
| Nama Pengarang | : | Frans Susilo |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 157-160 |
| Abstraksi Narasi | : | A dynamical system can be represented by a continuous map defined on a metric space. A fuzzy dynamical system is a dynamical system defined on a metric space of fuzzy sets (which can be identified by their membership functions). In this paper chaotic fuzzy dynamical system is considered, by using the definition of chaos on crisp dynamical system (e.g. proposed by Li- Yorke, or by Devaney). |
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