| Nama Pengarang | : | MT. Sutamo |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 77-85 |
| Abstraksi Narasi | : | Surface of the earth geomorphology can be divided into two parts, namely the land body and the water body. Both bodies are always developing and changing. The land body experences degradation, whereas the body agradation. These proceeses are caused by exogene and endogene powers. This occurence is called succession. Segara Anakan succession proceession processes are determined by physical factors, e.g: location, goelogy, geomorphology, soil, hydrology, climate forest, and by human being activities, e.g: management and land use on hinterland and foreland. The aim of this research is to study and predict the physical factors and human being activities, which are influential to Segara Anakan succession proceesses. This study was carried out in three ways, 1.e: (1) air photo interpretation to get physical and socio-economical data, (2) topographic map and archive analysis, and (3) field observation (reconnaissance) to complement the above two ways. |
| Nama Pengarang | : | Yosaphat Sumardi, The Houe Liong, Srijatno Wirjosoedirdjo, Alamta Singarimbun, |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 57-63 |
| Abstraksi Narasi | : | The finite element method is used to visualize the development of flow patern and temperature distribution in two-dimentional liquid-dominated geothermal system. This system is assumed as a homogenous porous host rock that that is fully saturated by pure water. FEMLAB software is used to solve the differential equations of flow and transport simultaneously. The different flow pattern and temperature distribution appear with increasing simulation time. |
| Nama Pengarang | : | Fikri Alaml |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 1-10 |
| Abstraksi Narasi | : | This paper aims to establish the relationship between buckling load and natural frequency of several types of structure, i.e. a simple pin-ended column, a single 2D-frame, and a single 3D-frame. for the case of a simple pin-ended column, a single 2D-frame, and a single 3D-frame, the relationship between buckling load and natural frequency agrees to the equation (1:1). In other word, the relationship is linear. The reason is that the buckling mode shape is identical to the vibration mode shape. Although the relationship between buckling load and natural frequency of those structures agrees to the equation (1:1), the critical buckling loads obstained from experiments of those structures were compares were compaable to the values obstained theoretically and numerically. |
| Nama Pengarang | : | Sahat Simbolon |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 17-26 |
| Abstraksi Narasi | : | Eh-pH diagrams of plutonium under standard temperature and pressure (STP) assumption have been made. The stability domain of water was described based on redox reaction of water with oxygen and hydrogen. Two pairs of lines which were almost paralel to each other were found. Redox reaction of plutonium has yielded four Nerst equations, each of which was represented by a line, one line was vertical as a result of non-redox reaction. The length of each line was dependent on the other lines. Two pairs of lines were overlapped to each other if the concentration of each species was 10 M. Eh-pH diagrams of plutonium with non-similar concentrations were also described. |
| Nama Pengarang | : | Henry Pantas Pangabean, Sahat Simbolon, Fikri Alami, Sumardi, Yosaphat, The Houw Liong, Srijatno Wiryosoedirdjo, Alamta Singarimbun, MT. Sutarno, Bernardinus Sri Widodo, Santoso, Mardi, Sri Hartati Wijono, Hesti Susilawati, Ali Mustofa, Oyas Wahyunggoro |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 27-35 |
| Abstraksi Narasi | : | As a NP-hard combinatorial optimization problem, job-shop scheduling can be solve quite well by simulated annealing (SA) algorithm. This paper presents the application of Schrage algorithm to substitude random generation method of initial solution in SA algorithm to increase its performance in term of solution quality and computation time. One-machine schedules produced by Schrage algorithm are combined to form an initial job-shop schedule. Progaram runs prove that this modification yields a better result in solving job-shop problem. The strong point of Schrage algorithm is its nature to take into account the order of head and tail value of each operation to built a good initial one-machine schedule. |
| Nama Pengarang | : | Kadarwati Budihardjo and Sri Gunawan |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 135-147 |
| Abstraksi Narasi | : | An experiment on the use of tofu whey for cacao seedling has been done to investigate the combined treatments of incubation time and tofu whey dosage to obtain the best influence on the growth of cacao seedling. The research was carried out at the research center of STIPER Agricultural Institute in Yogyakarta. The elevation of the place is about 118 m above sea level. A Completely Randomized Design with factorial pattern was used in this experiment with two factors and three replications. The first treatment factor was incubation time of tofu whey consisted of four levels, i.e.: (I0) 0-day incubation; (I1) 2-day incubation;(I2) |
| Nama Pengarang | : | C. M. Raina Rini Nastiti |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 167-173 |
| Abstraksi Narasi | : | The aim of this research was to observe the effects of curcuminoid pretreatment on the pharmacokinetic parameter values of salicylamide in male white rabbits. It was done by the same subject experimental design using six male white rabbits (2-3 months old, 1-2 kg BW). The subjects underwent two steps of treatment, i.e. control step (were given 50 mg/kg BW of salicylamide i.p.) and treatment step (were given 5 mg/kg BW of curcuminoid orally, 1 hour before administered by 50 mg/kg BW of salicylamide i.p). The concentration of salicylamide in blood was determined using spectrofluorometry method in maximum wavelengths of exitation and emission 350 nm and 416 nm in series. The data were analyzed using CPL (Clinical Pharmacology Laboratory) software and compared statistically using paired t-test with 95% confident interval. The results showed that in salicylamide, Cp max and AUD decreased while Vdss/F and CI/F increased significantly after curcuminoid pretreatment. |
| Nama Pengarang | : | Hanoch J. Sohilait |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 193-196 |
| Abstraksi Narasi | : | Synthesis of 3.4-dimethoxyphenyl-2-propanone from methyleugenol has been achieved through conversion of allyl group to secondary alcohol, followed by oxidation with CrO3 and Pyridine Chlorochromate (PCC). The oxymercuration-demercuration reaction of methyleugenol with Hg (II) OAc-NaBH4 yields methyleugenyl alcohol (65,56%). The oxidation of methyleugenyl alcohol with CrO3 yields 3,4-dimethoxyphenyl-2-propanone (25,34%) and with PCC yields 3,4-dimethoxyphenyl-2-propanone (98,69%). The oxidation products of methyleugenyl alcohol were analyzed using GLC. The elucidation structure of these products was analyzed using FTIR,^1H-NMR, ^13C-NMR, and MS. |
| Nama Pengarang | : | Sahat Simbolon |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 149-157 |
| Abstraksi Narasi | : | An experiment to measure the concentration of nonmetal impurities was carried out using the emission spectrograph method. A 100 mg sample was mixed with with 2% of Ga2O3 and AgCl and excited with fixed 220V voltage, 10A current for 40 seconds. All the spectra were recorded using thorax film plate and processed in a dark room to produce a set of metal and nonmetal spectra from 2000 A to 4500 A. The element identification was done by calibrating the sample film plate compared to the standard one. For quantitative purposes, the intensities of the analyzed elements in the standard plate were compared to the intensities of the analyzed elements in the sample plate. It was found out that there were only two nonmetals, namely boron and silicon, which could be analyzed using the conventional method, whereas halogen elements could not be analyzed using the conventional method. |
| Nama Pengarang | : | Anastasia Rita Wldiarti |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 183-192 |
| Abstraksi Narasi | : | There are several algorithms that can be used to solve a problem. The world series odds problem can be solved using algorithm with recursive or dynamic programming approach. The results of computing the running time of the algorithms and analyzing the programs show that, to solve the problem of world series odds, the dynamic programming approach is more efficient than the recursive approach. |
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