Agency for Assessment and Application of Technology

Jakarta, Indonesia

Agency for Assessment and Application of Technology

Jakarta, Indonesia
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Moraru D.,University of Shizuoka | Muruganathan M.,Japan Advanced Institute of Science and Technology | Anh L.T.,Japan Advanced Institute of Science and Technology | Nuryadi R.,Agency for Assessment and Application of Technology | And 3 more authors.
Advances in Intelligent Systems and Computing | Year: 2017

Inter-band tunneling current is an attractive transport mechanism for future generations of electronics. However, this mechanism is limited by the momentum conservation law which requires phonon assistance in tunneling due to the indirect-bandgap nature of Si. Here, we show that in low-dimensional pn Esaki diodes, inter-band tunneling current can be enhanced by the resonance of discrete dopants with deepened energy levels. Current enhancement is comparable with the background direct inter-band tunneling and can be modulated by the applied biases, suggesting a pathway for controlling atomic-level resonances for practical purposes. © Springer International Publishing AG 2017.


Mirda Yanti F.,Agency for Assessment and Application of Technology | Murti S.D.S.,Agency for Assessment and Application of Technology | Krisnandi Y.K.,University of Indonesia | Adiarso,Agency for Assessment and Application of Technology
MATEC Web of Conferences | Year: 2017

Methane is one of the greenhouse gases that can be converted into liquid fuels such as methanol to retain most of the energy of methane and produce a cleaner environment. The conversion of methane to methanol using ZMS-5 represents a breakthrough in the utilization of methane. However, material sources for zeolite synthesis as catalyst usually are pro-analysis grade materials, which are expensive. Therefore, in this research, coal fly ash and rice husk ash were used as raw materials for mesoporous ZSM-5 zeolite synthesis. First, coal fly ash and rice husk were subjected to pre-treatment to extract silicate (SiO4 4-) and aluminate (AlO4 5-) and impurities separation. The ZSM-5 zeolite was synthesized through hydrothermal treatment using two types of templates. After ZSM-5 was synthesized, it was modified with Cobalt through impregnation method. The catalytic activity of both ZSM-5 and Co/ZSM-5 zeolites as heterogeneous catalysts in partial oxidation of methane were preliminary tested and compared with that commercial one. The result showed that the zeolite catalyst ZSM-5 from fly ash coal and rice husk ash has the potential to be used as catalysts in the partial oxidation of methane to methanol. © The Authors, published by EDP Sciences, 2017.


Noviyanti R.,Eijkman Institute for Molecular Biology | Noviyanti R.,The Ministry of Research and Technology RISTEK | Coutrier F.,Eijkman Institute for Molecular Biology | Coutrier F.,The Ministry of Research and Technology RISTEK | And 22 more authors.
PLoS Neglected Tropical Diseases | Year: 2015

Outside of Africa, P. falciparum and P. vivax usually coexist. In such co-endemic regions, successful malaria control programs have a greater impact on reducing falciparum malaria, resulting in P. vivax becoming the predominant species of infection. Adding to the challenges of elimination, the dormant liver stage complicates efforts to monitor the impact of ongoing interventions against P. vivax. We investigated molecular approaches to inform the respective transmission dynamics of P. falciparum and P. vivax and how these could help to prioritize public health interventions. Genotype data generated at 8 and 9 microsatellite loci were analysed in 168 P. falciparum and 166 P. vivax isolates, respectively, from four co-endemic sites in Indonesia (Bangka, Kalimantan, Sumba and West Timor). Measures of diversity, linkage disequilibrium (LD) and population structure were used to gauge the transmission dynamics of each species in each setting. Marked differences were observed in the diversity and population structure of P. vivax versus P. falciparum. In Bangka, Kalimantan and Timor, P. falciparum diversity was low, and LD patterns were consistent with unstable, epidemic transmission, amenable to targeted intervention. In contrast, P. vivax diversity was higher and transmission appeared more stable. Population differentiation was lower in P. vivax versus P. falciparum, suggesting that the hypnozoite reservoir might play an important role in sustaining local transmission and facilitating the spread of P. vivax infections in different endemic settings. P. vivax polyclonality varied with local endemicity, demonstrating potential utility in informing on transmission intensity in this species. Molecular approaches can provide important information on malaria transmission that is not readily available from traditional epidemiological measures. Elucidation of the transmission dynamics circulating in a given setting will have a major role in prioritising malaria control strategies, particularly against the relatively neglected non-falciparum species.


Suseno H.,National Nuclear Energy Agency | Wahono I.B.,Agency for Assessment and Application of Technology | Muslim,University of Semarang
Marine Pollution Bulletin | Year: 2015

As data on anthropogenic radionuclide concentrations (i.e., 134Cs and 137Cs) in Indonesian marine environments including the Indian Ocean are scarce, offshore monitoring has been performed in the West Sumatra and South Java Seas. The activity concentration of 137Cs ranges from below minimum detectable activity (MDA) to 0.13Bqm-3 in the surface seawater of the South Java Sea and from lower than MDA to 0.28Bqm-3 in the surface seawater of the West Sumatra Sea. The concentrations of 137Cs in the surface seawater of the West Sumatra and South Java Seas are lower than the estimation of 137Cs concentration in the subsurface waters owing to the input of the North Pacific Ocean via the Indonesian Throughflow (ITF). The concentrations of 134Cs in the sampling locations were lower than MDA. These results have indicated that these Indonesian marine waters have not yet been influenced by the Fukushima radioactive release. © 2015 Elsevier Ltd.


PubMed | University of Semarang, National Nuclear Energy Agency and Agency for Assessment and Application of Technology
Type: Journal Article | Journal: Marine pollution bulletin | Year: 2015

As data on anthropogenic radionuclide concentrations (i.e., (134)Cs and (137)Cs) in Indonesian marine environments including the Indian Ocean are scarce, offshore monitoring has been performed in the West Sumatra and South Java Seas. The activity concentration of (137)Cs ranges from below minimum detectable activity (MDA) to 0.13Bqm(-3) in the surface seawater of the South Java Sea and from lower than MDA to 0.28Bqm(-3) in the surface seawater of the West Sumatra Sea. The concentrations of (137)Cs in the surface seawater of the West Sumatra and South Java Seas are lower than the estimation of (137)Cs concentration in the subsurface waters owing to the input of the North Pacific Ocean via the Indonesian Throughflow (ITF). The concentrations of (134)Cs in the sampling locations were lower than MDA. These results have indicated that these Indonesian marine waters have not yet been influenced by the Fukushima radioactive release.


Gustiono D.,Ibnu Sina Institute for Fundamental Science Studies | Gustiono D.,Agency for Assessment and Application of Technology | Wibowo E.,State University of Semarang | Othaman Z.,Ibnu Sina Institute for Fundamental Science Studies
Journal of Physics: Conference Series | Year: 2013

Semiconductor nanowires have been intensively investigated in order to study their unique fundamental and application properties that develop at the nano-scale. One of main problems in the growth of III-V semiconductor nanowire is uniformity both of in dimension and composition of chemical elements. We synthesized InGaAs nanowire on GaAs (111) substrate at 400 °C-480 °C temperatures for 30 minutes using MOCVD. The nanowires grow perpendicular to the substrate via direct impinging mechanism and they have hexagonal shape with diameter of 80-150 nm. Dimension of nanowire, length and diameter, increase with increases of growth temperature. Formations of tapering could be controlled with growth at lower temperature. © IOP Publishing Ltd 2013.


Suseno H.,National Nuclear Energy Agency | Wahono I.B.,Agency for Assessment and Application of Technology
Marine Pollution Bulletin | Year: 2015

As data on anthropogenic radionuclide concentrations (i.e., 134Cs and 137Cs) in Indonesian marine environments including the Indian Ocean are scarce, offshore monitoring has been performed in the West Sumatra and South Java Seas. The activity concentration of 137Cs ranges from below minimum detectable activity (MDA) to 0.13Bqm-3 in the surface seawater of the South Java Sea and from lower than MDA to 0.28Bqm-3 in the surface seawater of the West Sumatra Sea. The concentrations of 137Cs in the surface seawater of the West Sumatra and South Java Seas are lower than the estimation of 137Cs concentration in the subsurface waters owing to the input of the North Pacific Ocean via the Indonesian Throughflow (ITF). The concentrations of 134Cs in the sampling locations were lower than MDA. These results have indicated that these Indonesian marine waters have not yet been influenced by the Fukushima radioactive release. © 2015 Elsevier Ltd.


PubMed | Charles Darwin University, Armauer Hansen Research Institute, Agency for Assessment and Application of Technology, Addis Ababa Institute of Technology and 2 more.
Type: Journal Article | Journal: PloS one | Year: 2015

P. vivax is an important public health burden in Ethiopia, accounting for almost half of all malaria cases. Owing to heterogeneous transmission across the country, a stronger evidence base on local transmission dynamics is needed to optimise allocation of resources and improve malaria interventions.In a pilot evaluation of local level P. vivax molecular surveillance in southern Ethiopia, the diversity and population structure of isolates collected between May and November 2013 were investigated. Blood samples were collected from microscopy positive P. vivax patients recruited to clinical and cross-sectional surveys from four sites: Arbaminch, Halaba, Badawacho and Hawassa. Parasite genotyping was undertaken at nine tandem repeat markers. Eight loci were successfully genotyped in 197 samples (between 36 and 59 per site). Heterogeneity was observed in parasite diversity and structure amongst the sites. Badawacho displayed evidence of unstable transmission, with clusters of identical clonal infections. Linkage disequilibrium in Badawacho was higher (IAS = 0.32, P = 0.010) than in the other populations (IAS range = 0.01-0.02) and declined markedly after adjusting for identical infections (IAS = 0.06, P = 0.010). Other than Badawacho (HE = 0.70), population diversity was equivalently high across the sites (HE = 0.83). Polyclonal infections were more frequent in Hawassa (67%) than the other populations (range: 8-44%). Despite the variable diversity, differentiation between the sites was low (FST range: 5 x 10-3-0.03).Marked variation in parasite population structure likely reflects differing local transmission dynamics. Parasite genotyping in these heterogeneous settings has potential to provide important complementary information with which to optimise malaria control interventions.


Soedarsono J.W.,University of Indonesia | Kawigraha A.,University of Indonesia | Kawigraha A.,Agency for Assessment and Application of Technology | Sulamet-Ariobimo R.D.,Trisakti University | And 3 more authors.
Advanced Materials Research | Year: 2013

Limitation of iron ore reserve having high quality ore and of energy has enhanced development in iron and steel producing technology and method. The ITmk3 process is one of iron making technology that can cope with the problems. It uses composite pellet as feeding material. In this process the ratio between iron and carbon are very important. Carbon holds an important role in the reduction process of iron. The transformation from iron oxides to iron metal will complete if composite pellet contains enough carbon. This paper discusses the influence of carbon ratio in iron reduction process. Nickel saprolite and coal are used as iron and carbon source. They are grinded, crushed, sieved, mixed and formed in cylinders. The weight ratios of ores to coal are 1:1 and 2:1. The reduction held in a furnace at 1100°C for 60 minutes and 1250°C for 120 minutes. The results show that the reduction could not complete. Weak peak of FeNi is due to reduction process do not immediately follow the dehydroxylation process. © (2013) Trans Tech Publications, Switzerland.


Waris A.,Bandung Institute of Technology | Pramuditya S.,Bandung Institute of Technology | Aji I.K.,Bandung Institute of Technology | Wirawan R.,Agency for Assessment and Application of Technology | Nuha,Agency for Assessment and Application of Technology
Applied Mechanics and Materials | Year: 2014

Study on SUPEL (Straight Utilization of sPEnt LWR fuel in LWR system) scenario for PWR spent fuel direct recycling scheme has been performed. Several spent PWR fuel compositions in loaded fuel has been investigated to achive the criticality of reactor. The reactor can obtain it criticality for 4.5 a% of UO2 enrichment with at maximum 8.0 a% of spent fuel fraction in loaded fuel. The neutron spectra become harder with the raising of UO2 enrichment in the loaded fresh fuel as well as the increasing of the fraction of spent fuel in the core. © (2014) Trans Tech Publications, Switzerland.

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