[en] The Lembang fault is located around eight kilometers from Bandung City, West Java, Indonesia. The existence of this fault runs through densely populated settlement and tourism area. It is an active fault structure with increasing seismic activity where the 28 August 2011 earthquake occurred. The seismic response at the site is strongly influenced by local geological conditions. The ambient noise measurements from the western part of this fault give strong implication for a complex 3-D tectonic setting. Hence, near surface Electromagnetic (EM) measurements are carried out to understand the location of the local active fault of the research area. Hence, near surface EM measurements are carried out to understand the location of the local active fault and the top of the basement structure of the research area. The Transientelectromagnetic (TEM) measurements are carried out along three profiles, which include 35 TEM soundings. The results indicate that TEM data give detailed conductivity distribution of fault structure in the study area

[en] A prototype of a simple decade scaler made of devices and components available in the local market, is described. The constituents of the system, consisting of an amplifier, pulse shaper, counting system, low voltage and high voltage supply, are also described. The number of pulses counted are indicated on six digits, varying to a maximum of 999999 counts, using LED device. This apparatus may be interconnected with scintillation and Geiger Muller detectors. (author)

[en] Concrete is a generally used material in building construction. The construction will be built on the ground and could also be in places exposed to sea water. Sulfate contained in ground water and sea water could cause sulfate aggression to concrete itself. Therefore, the research used Reactive Powder Concrete which is one of the concretes that is currently popular and has a high durability. The research was done by doing a constant repetition of saturated sulfate submersion and specimen abstersion. The varieties of specimen used along with the research such as Type I, Type II, and PCC variations of cements, also varieties fas 0.2 and fas 0.25. Research shown that Reactive Powder Concrete which is contained type II cement has the best resistance because the compressive strength does not reduced to 30% and the reduced weight is less than 1% when exposed to high concentration of sulfate. (paper)

[en] Book collection in the library of Gama Atomic Energy Research Centre, National Atomic Energy Agency in December 1974 is grouped according to Universal Decimal Classification. In accordance with the function of the library most of the collections are on physics, mathematics, and engineering. Authors and subjects are alphabetically indexed in the last part of the catalog. (author)

[en] Solid-state diffusion bonding is a selected joining technology to bond divertor components consisting of tungsten and EUROFER97 for application in fusion power plants. Due to the large mismatch in their coefficient of thermal expansions, which leads to serious thermally induced residual stresses after bonding, a thin vanadium plate is introduced as an interlayer. However, the diffusion of carbon originated from EUROFER97 in the vanadium interlayer during the bonding process can form a vanadium carbide layer, which has detrimental influences on the mechanical properties of the joint. For optimal bonding results, the thickness of this layer and the residual stresses has to be decreased sufficiently without a significant reduction of material transport especially at the vanadium/tungsten interface, which can be achieved by varying the diffusion bonding temperature and duration. The investigation results show that at a sufficiently low bonding temperature of 700 °C and a bonding duration of 4 h, the joint reaches a reasonable high ductility and toughness especially at elevated test temperature of 550 °C with elongation to fracture of 20% and mean absorbed Charpy impact energy of 2 J (using miniaturized Charpy impact specimens). The strength of the bonded materials is about 332 MPa at RT and 291 MPa at 550 °C. Furthermore, a low bonding temperature of 700 °C can also help to avoid the grain coarsening and the alteration of the grain structure especially of the EUROFER97 close to the bond interface

[en] Recovery of U_3Si_2 powder has been carried out by means of electrolysis using copper electrode as the anode, and the rejected fuel element plate as the cathode. Before analysis is performed, the fuel element plate is cut and weighed. Parameters assessed in the experiment are HNO_3 electrolyte concentration, electrolysis time, and voltage. After the electrolysis is completed, the recovered U_3Si_2 powder and Cu electrode are weighed. The experiment results show that the optimum electrolysis condition is achieved at HNO_3 electrolyte concentration of 1 N, electrolysis time of 90 minutes, and voltage of 4 volt, which is marked by a large quantity of Al and AlMg_2 deposits on the copper electrode and the accumulation of U_3Si_2 powder at the bottom of HNO_3 electrolyte container. The accumulated U_3Si_2 powder in the container was 2.158 g. (author)

[en] Ferritic oxide dispersion strengthened (ODS) steels are well suited as structural materials, e.g. for claddings in fission reactors and for plasma facing components in fusion power plants due to their high mechanical and oxidation stability at high temperatures and their high irradiation resistance. PM2000 is an iron based ODS ferritic steel with homogeneously distributed nanometric yttria particles. Melting joining techniques are not suitable for such ODS materials because of the precipitation and agglomeration of the oxide particles and hence the loss of their strengthening effect. Solid state diffusion bonding is thus chosen to join PM2000 and is investigated in this work with a focus on oxide particles. The diffusion bonding process is aided by the computational modeling, including the influence of the ODS particles. For modeling the microstructure stability and the creep behavior of PM2000 at various, diffusion bonding relevant temperatures (50–80% T_m) are investigated. Particle distribution (TEM), strength (tensile test) and toughness (Charpy impact test) obtained at temperatures relevant for bonding serve as input for the prediction of optimal diffusion bonding parameters. The optimally bonded specimens show comparable strength and toughness relative to the base material

[en] The utilization of biofuels based on palm oil could decrease greenhouse gasses (GHG) emitted by fossil fuels. The aim of this research is on the optimization of blending strategy of Fatty Acid Methyl Esters (FAME), Hydrogenated Vegetable Oil (HVO), Diesel CN48 (DCN48), and Diesel CN53 (DCN53) to meet the fuel quality standard, Euro2 and Euro4 by minimizing levelized cost of fuel supply and GHG emission. The process simulation is performed by Aspen Plus software, proceed by Life Cycle Analysis (LCA) calculation. The optimization is carried out by General Algebraic Modelling System (GAMS) with Cplex solver. The result showed the percentage of the optimal blending composition of fuel quality Euro2 were FAME 43.9-51.1%, HVO 2.6-40.1%, DCN48 15.3-17.6%, and DCN53 46.3-100% with LCOE was 0.55-0.864 USD/Liter and GHG intensity 599.46-3000.78 gCO_2eq/Liter. For Euro4 specification consists of FAME 32.5%, HVO 28.6%, and DCN53 38.8% with LCOE were 0.637-0.786 USD/Liter and GHG intensity of 902.69-2863.03 gCO_2eq/Liter. (paper)

[en] Earlier basic investigations revealed that diffusion bonding between tungsten and RAFM-steel at a relatively low temperature using a thin low-activation vanadium interlayer having a CTE between that of the parent materials can significantly reduce the residual stresses and produce defect-free bond interfaces. The joint has a high strength as well as sufficient ductility and toughness especially at the test temperature of about 550 °C. To apply this knowledge in fusion power plants, particularly in divertors, an acceptable lifetime of such structural joints is required, since they are exposed to high thermomechanical cyclic loading. To simulate the possible operational conditions of a He-cooled divertor, diffusion-bonded specimens are loaded by thermal cycling in a temperature range between 350 °C and 500 °C and a constant tensile stress based on the calculation of the internal pressure of the divertor thimble. The aim of this experimental work is to check the resistance of the diffusion-bonded W/EUROFER97 against ratcheting during thermomechanical loading and analyze the evolution of microstructures of the joint especially along the bond interfaces

[en] Self (quenching streamer) mode, a new development of gas detector. The gas filled detector operating in the SQS mode region has been widely used for nuclear radiation detection. The charge amplification process, the growth of electron avalanche mechanism and the SQS mechanism in a gas detector are reviewed briefly in this paper. The gas mixture composition, gas pressure and anode diameter of a gas play an important role in the streamer formation. (author). 9 refs.; 6 figs