Guntur Pasau
@unsrat.ac.id
Physics Department/ Faculty of Mathematics and Natural Sciences
Sam Ratulangi University
EDUCATION
Master Degree
RESEARCH INTERESTS
Earthquake and tsunami
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Gerald Tamuntuan, Wiesje Kumolontang, Guntur Pasau, Seni H. Tongkukut, Dini Fitriani, Agnes T. Mandagi, Hesky Kolibu, Verna Suoth, As’ari As’ari, Handy Mosey,et al.
AIP Publishing
Verna Albert Suoth, Handy Indra Regain Mosey, Dolfie Paulus Pandara, Hesky Stevy Kolibu, Hanny Frans Sangian, Guntur Pasau, Ferdy, and Gerald Tamuntuan
AIP Publishing
G. Pasau, A. Tanauma, H. J. Edy, Gerald Tamuntuan, H. F. Sangian, D. P. Pandara, F. Ferdy, A. As’ari, V. A. Suoth, S. H. J. Tongkukut,et al.
AIP Publishing
Gerald Tamuntuan, Ping A. Angmalisang, Adey Tanauma, Seni H. Tongkukut, Hanny F. Sangian, Agnes T. Mandagi, Silvia J. Fajar, Dolfie P. Pandara, Guntur Pasau, Ferdy Ferdy,et al.
AIP Publishing
H. F. Sangian, N. Rawung, G. Pasau, Gerald Tamuntuan, S. H. Tongkukut, A. As’ari, M. D. Bobanto, D. P. Pandara, A. Tanauma, F. Ferdy,et al.
AIP Publishing
Dolfie P. Pandara, Maria D. Bobanto, Ferdy Ferdy, Guntur Pasau, and Gerald Tamuntuan
AIP Publishing
Hanny Frans Sangian, Dini Lestari, Guntur Pasau, Gerald H. Tamuntuan, Arief Widjaja, Ronny Purwadi, Silvya Yusnica Agnesty, Bayu Sadjab, Messiah Charity Sangian, and Ramli Thahir
Private Company Technology Center
The work was purposed to identify the compositions the blended fuel of butanol, gasoline, and water forming the stable emulsions at low temperatures. The previous researches reported that the blending of butanol and gasoline generally employed the synthetic surfactants which were expensive and mixed at room temperatures. It is important to analyze the stability of the substances in the wide range of temperature for it alter significantly on the surface of the planet. The references survey revealed that the works of the compositions of the wet butanol and gasoline at low temperatures are yet published. The present work was successful to blend the butanol, gasoline, and water in stable emulsion without using the surfactant and stabilized in the less of room temperature. Compositions of butanol, gasoline (RONs 90), and water emulsified and stabilized at low temperatures without synthetic surfactants were successfully studied. It was found that aqueous butanol and gasoline formed a stable emulsion at low temperatures and discovered the phase was separated if temperature declined. The compositions of pure butanol, gasoline, and water recorded in stable emulsions using butanol 85.00 % ranged from 75.08–79.24 %, 6.77–11.67 %, and 13.25–13.98 %, respectively, blended at temperatures 0.00–29.70 °C. The usage of butanol 99.50 % caused the change of compositions recorded at 0.71–11.34 %, 88.61–99.29 %, and 0.00–0.06 % blended at 0.00–29.00 °C. It was discovered that the increase of butanol percentage of the fuel after the emulsion was stable tended to the emulsion kept one phase. The emulsion fuels found would be applied to the heat-modified engines operating in wide range temperatures which were below room temperature
Hanny Frans Sangian, Guntur Pasau, Gerald Hendrik Tamuntuan, Arief Widjaja, Ronny Purwadi, Silvya Yusnica Agnesty, Tun Sriana, Arif Nurrahman, Abubakar Tuhuloula, and Ramli Thahir
Private Company Technology Center
Many countries worldwide encounter the greatest difficulties in improving people's life quality since fossil fuel reserves are decreasing, causing fuel prices to rise drastically. This problem has made many countries, including Indonesia, struggle to import them from producers in the Middle East. Adding a small part of ethanol to gasoline is one of the solutions that has been investigated and developed. The previous works relating to blended fuels, gasoline and ethanol, generally employed absolute alcohol, which was expensive. A small surfactant was added to the mixture to stabilize the emulsion, and the blending was conducted in normal conditions (room temperature). If the composition of gasoline and aqueous ethanol is not precise, the components can be separated at a specific temperature. The present study is aimed to report the analysis of compositions and fuel specifications of aqueous emulsions of gasoline (RON 90)-ethanol-water in a single phase without using a synthetic surfactant in the temperature range of 0–25 °C. The procedures were as follows: fermentation, ethanol distillation and purification, cooling, blending, and characterization of fuel specifications. Components of gasoline (RON 90)-ethanol-water formed a stable emulsion in the composition range of 28.00‒99.79 %, 0.20‒67.97 %, and 0.01‒3.58 %. The observation found that continually increasing the amount of aqueous ethanol and temperature after one phase was attained would not lead to the separation of components. Therefore, gasoline and aqueous ethanol can form a single phase functioning as a surfactant binding water and fossil fuel. The decrease in temperature after the emulsion is stabilized can separate the components whereby it is caused by the faster density change of aqueous ethanol than gasoline
Hanny F. Sangian, Meiga P. Paendong, Joshua R. Rombang, Jil A. Lametige, Guntur Pasau, Maria Bobanto, Ronny Purwadi, Ramli Thahir, Bayu Achil Sadjab, Vecky A. J. Masinambow,et al.
World Scientific and Engineering Academy and Society (WSEAS)
This work aims at preparing the blended fuels in a stable emulsion in which the biodiesel was obtained from palm oil with applying the near isochoric subcritical trans-esterification. The work procedures are the following: the preparation chemicals needed; the synthesis of the biodiesel; POME (palm oil methyl ester) analysis; the blending process of the aqueous ethanol-biodiesel (Aq.Et-BD) and ethanol-diesel-biodiesel (Aq.Et-BD-D) whereby they formed in a stable emulsion. It was obtained that the compositions of water, ethanol, and biodiesel using ethanol 94-97% were ranged from 0.69-1.60, 10.74-38.40, and 69.57-88.57%. By employing ethanol with concentration 94-95%, the emulsion appeared many droplets distributed throughout the substance. It was observed by increasing biodiesel composition after a stable emulsion attained the phase did not change. After emulsions blended, the work was proceeded with the measurement of the fuel parameters such as density, SG, API, RPV, flash and pour points, cetane number, and distillation properties.
Hanny F. Sangian, Anita R. Ibrahim, Handy I. R. Mosey, Joshua R. Rombang, Adey Tanauma, Guntur Pasau, Seni H. Tongkukut, Fingken Sagai, Ronny Purwadi, Godlief F. Neonufa,et al.
Revista de Chimie SRL
This study investigates the composition and fuel parameters of a fuel blend of aqueous ethanol and gasoline, with RONs (Research Octane Numbers) of 90 and 92, called pertalite and pertamax in Indonesia, respectively. The emulsion fuel blend of gasoline and ethanol was prepared successfully, and the concentrations ranged from 80 to 98% (v/v). The steps employed in this work are as follows: first, the fermentation of sugar tapped from a palm tree (Arenga pinnata). The obtained liquor containing ethanol was distilled using a reflux still to separate ethanol and water. The purity of the ethanol obtained from the reflux process ranged from 80 to 96%, depending on the column temperature set. Ethanol solutions of 97 and 98% purities were obtained through an absorption method employing lime particles. Subsequently, aqueous ethanol was blended with gasoline manually inside a flask. It was discovered that the minimum ethanol concentration, which could be blended with pertalite to form a single-phase substance, was 80%. By using 80% ethanol in the blending process, the composition ratio of pertalite, pure ethanol, and water was recorded as 1:11.65:2.91 (in volume unit), while this was not the case with pertamax. The minimum ethanol concentration that could be blended with pertamax to form a single-phase emulsion was 88%, with a composition ratio of 1:5.91:0.81. The composition proportions of the three components with 96% ethanol were 1:0.27:0.01 (RON 90) and 1:0.41:0.02 (RON 92). It was observed that the higher the ethanol concentration, the less the amount of ethanol required for the blending process with gasoline to form a single-phase emulsion.
G Pasau, G H Tamuntuan, and A Tanauma
IOP Publishing
The north arm of Sulawesi is one of the most vulnerable areas of the earthquake and tsunami. This region is a meeting place for several tectonic plates such as the Indo-Australian Plate, the Pacific Plate, the Philippine Sea Plate and the Eurasian Plate. As a result, collisions of the plates, subduction zones are formed in this region. The North of Sulawesi subduction zone and Molluca double subduction zone are sources of earthquakes that can generate tsunamis in the region. This study aims to examine the potential tsunami hazard on the north coast of Sulawesi’s northern arms specifically in the Manado bays. Data were collected from various tsunami catalogues and literature review to determine the input parameters. The modelling is done by using TUNAMI N2 software which is a tsunami modelling using shallow water wave theory. The simulation results show that the tsunami wave height that can hit the Manado beaches varies from about 1.5 to 3 meters, while the tsunami propagation time from the source to the beach is about 24 minutes after earthquake.
G H Tamuntuan, A Tanauma, G Pasau, and H Sangian
IOP Publishing
Abstract The coast of North Sulawesi has very potential natural resources. Coastal sand with relatively high iron content or commonly known as iron sand was detected in several locations. Iron sand is a source of economical minerals, namely iron (Fe), which is easier to treat compared to sources in stone form. However, scientific studies on iron sand minerals, especially those in the coastal areas of North Sulawesi, are still poor. Therefore, a study is needed to find out how the mineralogy, morphology and characteristics of iron sand particles in North Sulawesi. The results show that distribution of sand deposit range fine to coarse in size. However, fine-sized grains were dominant in samples from Lalow, Lolan, as well as Hais regions, whereas medium-sized grains were dominant in sample from Minanga. It probably indicates that Minanga area is relatively close to rock as a source of sand formation than other sampling location. In general, SEM observations show grains with relatively rounded in their morphology as well as have a smooth surface which is indicating a long range transport of these grains. EDX results show that the major elements in representative sand grains are Fe, Ti, and O, while the minor elements are Si, Al, Mg, Na, Co, Cl, and Ca. Fe content range from 45.18 to 61.48 wt%, whereas Ti content range from 4.35 wt% to 7.1 wt%.